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2823 lines
73 KiB
2823 lines
73 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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* Remote Processor Framework |
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* |
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* Copyright (C) 2011 Texas Instruments, Inc. |
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* Copyright (C) 2011 Google, Inc. |
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* |
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* Ohad Ben-Cohen <[email protected]> |
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* Brian Swetland <[email protected]> |
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* Mark Grosen <[email protected]> |
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* Fernando Guzman Lugo <[email protected]> |
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* Suman Anna <[email protected]> |
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* Robert Tivy <[email protected]> |
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* Armando Uribe De Leon <[email protected]> |
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*/ |
|
|
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#define pr_fmt(fmt) "%s: " fmt, __func__ |
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|
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#include <linux/delay.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/device.h> |
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#include <linux/panic_notifier.h> |
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#include <linux/slab.h> |
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#include <linux/mutex.h> |
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#include <linux/dma-map-ops.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/dma-direct.h> /* XXX: pokes into bus_dma_range */ |
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#include <linux/firmware.h> |
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#include <linux/string.h> |
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#include <linux/debugfs.h> |
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#include <linux/rculist.h> |
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#include <linux/remoteproc.h> |
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#include <linux/iommu.h> |
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#include <linux/idr.h> |
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#include <linux/elf.h> |
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#include <linux/crc32.h> |
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#include <linux/of_reserved_mem.h> |
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#include <linux/virtio_ids.h> |
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#include <linux/virtio_ring.h> |
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#include <asm/byteorder.h> |
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#include <linux/platform_device.h> |
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|
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#include "remoteproc_internal.h" |
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|
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#define HIGH_BITS_MASK 0xFFFFFFFF00000000ULL |
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|
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static DEFINE_MUTEX(rproc_list_mutex); |
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static LIST_HEAD(rproc_list); |
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static struct notifier_block rproc_panic_nb; |
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|
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typedef int (*rproc_handle_resource_t)(struct rproc *rproc, |
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void *, int offset, int avail); |
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|
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static int rproc_alloc_carveout(struct rproc *rproc, |
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struct rproc_mem_entry *mem); |
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static int rproc_release_carveout(struct rproc *rproc, |
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struct rproc_mem_entry *mem); |
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|
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/* Unique indices for remoteproc devices */ |
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static DEFINE_IDA(rproc_dev_index); |
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|
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static const char * const rproc_crash_names[] = { |
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[RPROC_MMUFAULT] = "mmufault", |
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[RPROC_WATCHDOG] = "watchdog", |
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[RPROC_FATAL_ERROR] = "fatal error", |
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}; |
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|
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/* translate rproc_crash_type to string */ |
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static const char *rproc_crash_to_string(enum rproc_crash_type type) |
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{ |
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if (type < ARRAY_SIZE(rproc_crash_names)) |
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return rproc_crash_names[type]; |
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return "unknown"; |
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} |
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|
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/* |
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* This is the IOMMU fault handler we register with the IOMMU API |
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* (when relevant; not all remote processors access memory through |
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* an IOMMU). |
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* |
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* IOMMU core will invoke this handler whenever the remote processor |
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* will try to access an unmapped device address. |
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*/ |
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static int rproc_iommu_fault(struct iommu_domain *domain, struct device *dev, |
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unsigned long iova, int flags, void *token) |
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{ |
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struct rproc *rproc = token; |
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|
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dev_err(dev, "iommu fault: da 0x%lx flags 0x%x\n", iova, flags); |
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rproc_report_crash(rproc, RPROC_MMUFAULT); |
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|
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/* |
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* Let the iommu core know we're not really handling this fault; |
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* we just used it as a recovery trigger. |
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*/ |
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return -ENOSYS; |
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} |
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|
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static int rproc_enable_iommu(struct rproc *rproc) |
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{ |
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struct iommu_domain *domain; |
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struct device *dev = rproc->dev.parent; |
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int ret; |
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|
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if (!rproc->has_iommu) { |
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dev_dbg(dev, "iommu not present\n"); |
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return 0; |
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} |
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|
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domain = iommu_domain_alloc(dev->bus); |
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if (!domain) { |
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dev_err(dev, "can't alloc iommu domain\n"); |
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return -ENOMEM; |
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} |
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iommu_set_fault_handler(domain, rproc_iommu_fault, rproc); |
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|
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ret = iommu_attach_device(domain, dev); |
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if (ret) { |
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dev_err(dev, "can't attach iommu device: %d\n", ret); |
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goto free_domain; |
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} |
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rproc->domain = domain; |
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return 0; |
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free_domain: |
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iommu_domain_free(domain); |
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return ret; |
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} |
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static void rproc_disable_iommu(struct rproc *rproc) |
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{ |
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struct iommu_domain *domain = rproc->domain; |
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struct device *dev = rproc->dev.parent; |
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if (!domain) |
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return; |
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iommu_detach_device(domain, dev); |
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iommu_domain_free(domain); |
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} |
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phys_addr_t rproc_va_to_pa(void *cpu_addr) |
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{ |
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/* |
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* Return physical address according to virtual address location |
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* - in vmalloc: if region ioremapped or defined as dma_alloc_coherent |
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* - in kernel: if region allocated in generic dma memory pool |
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*/ |
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if (is_vmalloc_addr(cpu_addr)) { |
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return page_to_phys(vmalloc_to_page(cpu_addr)) + |
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offset_in_page(cpu_addr); |
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} |
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|
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WARN_ON(!virt_addr_valid(cpu_addr)); |
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return virt_to_phys(cpu_addr); |
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} |
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EXPORT_SYMBOL(rproc_va_to_pa); |
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|
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/** |
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* rproc_da_to_va() - lookup the kernel virtual address for a remoteproc address |
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* @rproc: handle of a remote processor |
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* @da: remoteproc device address to translate |
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* @len: length of the memory region @da is pointing to |
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* @is_iomem: optional pointer filled in to indicate if @da is iomapped memory |
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* |
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* Some remote processors will ask us to allocate them physically contiguous |
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* memory regions (which we call "carveouts"), and map them to specific |
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* device addresses (which are hardcoded in the firmware). They may also have |
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* dedicated memory regions internal to the processors, and use them either |
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* exclusively or alongside carveouts. |
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* |
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* They may then ask us to copy objects into specific device addresses (e.g. |
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* code/data sections) or expose us certain symbols in other device address |
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* (e.g. their trace buffer). |
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* |
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* This function is a helper function with which we can go over the allocated |
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* carveouts and translate specific device addresses to kernel virtual addresses |
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* so we can access the referenced memory. This function also allows to perform |
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* translations on the internal remoteproc memory regions through a platform |
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* implementation specific da_to_va ops, if present. |
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* |
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* Note: phys_to_virt(iommu_iova_to_phys(rproc->domain, da)) will work too, |
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* but only on kernel direct mapped RAM memory. Instead, we're just using |
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* here the output of the DMA API for the carveouts, which should be more |
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* correct. |
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* |
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* Return: a valid kernel address on success or NULL on failure |
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*/ |
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void *rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem) |
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{ |
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struct rproc_mem_entry *carveout; |
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void *ptr = NULL; |
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|
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if (rproc->ops->da_to_va) { |
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ptr = rproc->ops->da_to_va(rproc, da, len, is_iomem); |
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if (ptr) |
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goto out; |
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} |
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list_for_each_entry(carveout, &rproc->carveouts, node) { |
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int offset = da - carveout->da; |
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|
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/* Verify that carveout is allocated */ |
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if (!carveout->va) |
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continue; |
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|
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/* try next carveout if da is too small */ |
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if (offset < 0) |
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continue; |
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|
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/* try next carveout if da is too large */ |
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if (offset + len > carveout->len) |
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continue; |
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ptr = carveout->va + offset; |
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if (is_iomem) |
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*is_iomem = carveout->is_iomem; |
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|
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break; |
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} |
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out: |
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return ptr; |
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} |
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EXPORT_SYMBOL(rproc_da_to_va); |
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|
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/** |
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* rproc_find_carveout_by_name() - lookup the carveout region by a name |
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* @rproc: handle of a remote processor |
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* @name: carveout name to find (format string) |
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* @...: optional parameters matching @name string |
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* |
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* Platform driver has the capability to register some pre-allacoted carveout |
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* (physically contiguous memory regions) before rproc firmware loading and |
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* associated resource table analysis. These regions may be dedicated memory |
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* regions internal to the coprocessor or specified DDR region with specific |
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* attributes |
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* |
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* This function is a helper function with which we can go over the |
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* allocated carveouts and return associated region characteristics like |
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* coprocessor address, length or processor virtual address. |
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* |
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* Return: a valid pointer on carveout entry on success or NULL on failure. |
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*/ |
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__printf(2, 3) |
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struct rproc_mem_entry * |
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rproc_find_carveout_by_name(struct rproc *rproc, const char *name, ...) |
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{ |
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va_list args; |
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char _name[32]; |
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struct rproc_mem_entry *carveout, *mem = NULL; |
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if (!name) |
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return NULL; |
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va_start(args, name); |
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vsnprintf(_name, sizeof(_name), name, args); |
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va_end(args); |
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list_for_each_entry(carveout, &rproc->carveouts, node) { |
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/* Compare carveout and requested names */ |
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if (!strcmp(carveout->name, _name)) { |
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mem = carveout; |
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break; |
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} |
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} |
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return mem; |
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} |
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/** |
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* rproc_check_carveout_da() - Check specified carveout da configuration |
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* @rproc: handle of a remote processor |
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* @mem: pointer on carveout to check |
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* @da: area device address |
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* @len: associated area size |
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* |
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* This function is a helper function to verify requested device area (couple |
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* da, len) is part of specified carveout. |
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* If da is not set (defined as FW_RSC_ADDR_ANY), only requested length is |
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* checked. |
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* |
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* Return: 0 if carveout matches request else error |
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*/ |
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static int rproc_check_carveout_da(struct rproc *rproc, |
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struct rproc_mem_entry *mem, u32 da, u32 len) |
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{ |
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struct device *dev = &rproc->dev; |
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int delta; |
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|
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/* Check requested resource length */ |
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if (len > mem->len) { |
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dev_err(dev, "Registered carveout doesn't fit len request\n"); |
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return -EINVAL; |
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} |
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if (da != FW_RSC_ADDR_ANY && mem->da == FW_RSC_ADDR_ANY) { |
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/* Address doesn't match registered carveout configuration */ |
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return -EINVAL; |
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} else if (da != FW_RSC_ADDR_ANY && mem->da != FW_RSC_ADDR_ANY) { |
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delta = da - mem->da; |
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|
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/* Check requested resource belongs to registered carveout */ |
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if (delta < 0) { |
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dev_err(dev, |
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"Registered carveout doesn't fit da request\n"); |
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return -EINVAL; |
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} |
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|
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if (delta + len > mem->len) { |
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dev_err(dev, |
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"Registered carveout doesn't fit len request\n"); |
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return -EINVAL; |
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} |
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} |
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return 0; |
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} |
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int rproc_alloc_vring(struct rproc_vdev *rvdev, int i) |
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{ |
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struct rproc *rproc = rvdev->rproc; |
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struct device *dev = &rproc->dev; |
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struct rproc_vring *rvring = &rvdev->vring[i]; |
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struct fw_rsc_vdev *rsc; |
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int ret, notifyid; |
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struct rproc_mem_entry *mem; |
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size_t size; |
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|
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/* actual size of vring (in bytes) */ |
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size = PAGE_ALIGN(vring_size(rvring->len, rvring->align)); |
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rsc = (void *)rproc->table_ptr + rvdev->rsc_offset; |
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|
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/* Search for pre-registered carveout */ |
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mem = rproc_find_carveout_by_name(rproc, "vdev%dvring%d", rvdev->index, |
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i); |
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if (mem) { |
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if (rproc_check_carveout_da(rproc, mem, rsc->vring[i].da, size)) |
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return -ENOMEM; |
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} else { |
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/* Register carveout in in list */ |
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mem = rproc_mem_entry_init(dev, NULL, 0, |
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size, rsc->vring[i].da, |
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rproc_alloc_carveout, |
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rproc_release_carveout, |
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"vdev%dvring%d", |
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rvdev->index, i); |
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if (!mem) { |
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dev_err(dev, "Can't allocate memory entry structure\n"); |
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return -ENOMEM; |
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} |
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|
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rproc_add_carveout(rproc, mem); |
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} |
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|
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/* |
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* Assign an rproc-wide unique index for this vring |
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* TODO: assign a notifyid for rvdev updates as well |
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* TODO: support predefined notifyids (via resource table) |
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*/ |
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ret = idr_alloc(&rproc->notifyids, rvring, 0, 0, GFP_KERNEL); |
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if (ret < 0) { |
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dev_err(dev, "idr_alloc failed: %d\n", ret); |
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return ret; |
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} |
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notifyid = ret; |
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|
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/* Potentially bump max_notifyid */ |
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if (notifyid > rproc->max_notifyid) |
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rproc->max_notifyid = notifyid; |
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|
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rvring->notifyid = notifyid; |
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|
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/* Let the rproc know the notifyid of this vring.*/ |
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rsc->vring[i].notifyid = notifyid; |
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return 0; |
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} |
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|
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static int |
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rproc_parse_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i) |
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{ |
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struct rproc *rproc = rvdev->rproc; |
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struct device *dev = &rproc->dev; |
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struct fw_rsc_vdev_vring *vring = &rsc->vring[i]; |
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struct rproc_vring *rvring = &rvdev->vring[i]; |
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|
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dev_dbg(dev, "vdev rsc: vring%d: da 0x%x, qsz %d, align %d\n", |
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i, vring->da, vring->num, vring->align); |
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|
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/* verify queue size and vring alignment are sane */ |
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if (!vring->num || !vring->align) { |
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dev_err(dev, "invalid qsz (%d) or alignment (%d)\n", |
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vring->num, vring->align); |
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return -EINVAL; |
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} |
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|
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rvring->len = vring->num; |
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rvring->align = vring->align; |
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rvring->rvdev = rvdev; |
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|
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return 0; |
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} |
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|
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void rproc_free_vring(struct rproc_vring *rvring) |
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{ |
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struct rproc *rproc = rvring->rvdev->rproc; |
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int idx = rvring - rvring->rvdev->vring; |
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struct fw_rsc_vdev *rsc; |
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|
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idr_remove(&rproc->notifyids, rvring->notifyid); |
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|
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/* |
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* At this point rproc_stop() has been called and the installed resource |
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* table in the remote processor memory may no longer be accessible. As |
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* such and as per rproc_stop(), rproc->table_ptr points to the cached |
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* resource table (rproc->cached_table). The cached resource table is |
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* only available when a remote processor has been booted by the |
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* remoteproc core, otherwise it is NULL. |
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* |
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* Based on the above, reset the virtio device section in the cached |
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* resource table only if there is one to work with. |
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*/ |
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if (rproc->table_ptr) { |
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rsc = (void *)rproc->table_ptr + rvring->rvdev->rsc_offset; |
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rsc->vring[idx].da = 0; |
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rsc->vring[idx].notifyid = -1; |
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} |
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} |
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|
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static int rproc_vdev_do_start(struct rproc_subdev *subdev) |
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{ |
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struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev); |
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|
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return rproc_add_virtio_dev(rvdev, rvdev->id); |
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} |
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|
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static void rproc_vdev_do_stop(struct rproc_subdev *subdev, bool crashed) |
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{ |
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struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev); |
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int ret; |
|
|
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ret = device_for_each_child(&rvdev->dev, NULL, rproc_remove_virtio_dev); |
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if (ret) |
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dev_warn(&rvdev->dev, "can't remove vdev child device: %d\n", ret); |
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} |
|
|
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/** |
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* rproc_rvdev_release() - release the existence of a rvdev |
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* |
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* @dev: the subdevice's dev |
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*/ |
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static void rproc_rvdev_release(struct device *dev) |
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{ |
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struct rproc_vdev *rvdev = container_of(dev, struct rproc_vdev, dev); |
|
|
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of_reserved_mem_device_release(dev); |
|
|
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kfree(rvdev); |
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} |
|
|
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static int copy_dma_range_map(struct device *to, struct device *from) |
|
{ |
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const struct bus_dma_region *map = from->dma_range_map, *new_map, *r; |
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int num_ranges = 0; |
|
|
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if (!map) |
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return 0; |
|
|
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for (r = map; r->size; r++) |
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num_ranges++; |
|
|
|
new_map = kmemdup(map, array_size(num_ranges + 1, sizeof(*map)), |
|
GFP_KERNEL); |
|
if (!new_map) |
|
return -ENOMEM; |
|
to->dma_range_map = new_map; |
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return 0; |
|
} |
|
|
|
/** |
|
* rproc_handle_vdev() - handle a vdev fw resource |
|
* @rproc: the remote processor |
|
* @ptr: the vring resource descriptor |
|
* @offset: offset of the resource entry |
|
* @avail: size of available data (for sanity checking the image) |
|
* |
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* This resource entry requests the host to statically register a virtio |
|
* device (vdev), and setup everything needed to support it. It contains |
|
* everything needed to make it possible: the virtio device id, virtio |
|
* device features, vrings information, virtio config space, etc... |
|
* |
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* Before registering the vdev, the vrings are allocated from non-cacheable |
|
* physically contiguous memory. Currently we only support two vrings per |
|
* remote processor (temporary limitation). We might also want to consider |
|
* doing the vring allocation only later when ->find_vqs() is invoked, and |
|
* then release them upon ->del_vqs(). |
|
* |
|
* Note: @da is currently not really handled correctly: we dynamically |
|
* allocate it using the DMA API, ignoring requested hard coded addresses, |
|
* and we don't take care of any required IOMMU programming. This is all |
|
* going to be taken care of when the generic iommu-based DMA API will be |
|
* merged. Meanwhile, statically-addressed iommu-based firmware images should |
|
* use RSC_DEVMEM resource entries to map their required @da to the physical |
|
* address of their base CMA region (ouch, hacky!). |
|
* |
|
* Return: 0 on success, or an appropriate error code otherwise |
|
*/ |
|
static int rproc_handle_vdev(struct rproc *rproc, void *ptr, |
|
int offset, int avail) |
|
{ |
|
struct fw_rsc_vdev *rsc = ptr; |
|
struct device *dev = &rproc->dev; |
|
struct rproc_vdev *rvdev; |
|
int i, ret; |
|
char name[16]; |
|
|
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/* make sure resource isn't truncated */ |
|
if (struct_size(rsc, vring, rsc->num_of_vrings) + rsc->config_len > |
|
avail) { |
|
dev_err(dev, "vdev rsc is truncated\n"); |
|
return -EINVAL; |
|
} |
|
|
|
/* make sure reserved bytes are zeroes */ |
|
if (rsc->reserved[0] || rsc->reserved[1]) { |
|
dev_err(dev, "vdev rsc has non zero reserved bytes\n"); |
|
return -EINVAL; |
|
} |
|
|
|
dev_dbg(dev, "vdev rsc: id %d, dfeatures 0x%x, cfg len %d, %d vrings\n", |
|
rsc->id, rsc->dfeatures, rsc->config_len, rsc->num_of_vrings); |
|
|
|
/* we currently support only two vrings per rvdev */ |
|
if (rsc->num_of_vrings > ARRAY_SIZE(rvdev->vring)) { |
|
dev_err(dev, "too many vrings: %d\n", rsc->num_of_vrings); |
|
return -EINVAL; |
|
} |
|
|
|
rvdev = kzalloc(sizeof(*rvdev), GFP_KERNEL); |
|
if (!rvdev) |
|
return -ENOMEM; |
|
|
|
kref_init(&rvdev->refcount); |
|
|
|
rvdev->id = rsc->id; |
|
rvdev->rproc = rproc; |
|
rvdev->index = rproc->nb_vdev++; |
|
|
|
/* Initialise vdev subdevice */ |
|
snprintf(name, sizeof(name), "vdev%dbuffer", rvdev->index); |
|
rvdev->dev.parent = &rproc->dev; |
|
ret = copy_dma_range_map(&rvdev->dev, rproc->dev.parent); |
|
if (ret) |
|
return ret; |
|
rvdev->dev.release = rproc_rvdev_release; |
|
dev_set_name(&rvdev->dev, "%s#%s", dev_name(rvdev->dev.parent), name); |
|
dev_set_drvdata(&rvdev->dev, rvdev); |
|
|
|
ret = device_register(&rvdev->dev); |
|
if (ret) { |
|
put_device(&rvdev->dev); |
|
return ret; |
|
} |
|
/* Make device dma capable by inheriting from parent's capabilities */ |
|
set_dma_ops(&rvdev->dev, get_dma_ops(rproc->dev.parent)); |
|
|
|
ret = dma_coerce_mask_and_coherent(&rvdev->dev, |
|
dma_get_mask(rproc->dev.parent)); |
|
if (ret) { |
|
dev_warn(dev, |
|
"Failed to set DMA mask %llx. Trying to continue... %x\n", |
|
dma_get_mask(rproc->dev.parent), ret); |
|
} |
|
|
|
/* parse the vrings */ |
|
for (i = 0; i < rsc->num_of_vrings; i++) { |
|
ret = rproc_parse_vring(rvdev, rsc, i); |
|
if (ret) |
|
goto free_rvdev; |
|
} |
|
|
|
/* remember the resource offset*/ |
|
rvdev->rsc_offset = offset; |
|
|
|
/* allocate the vring resources */ |
|
for (i = 0; i < rsc->num_of_vrings; i++) { |
|
ret = rproc_alloc_vring(rvdev, i); |
|
if (ret) |
|
goto unwind_vring_allocations; |
|
} |
|
|
|
list_add_tail(&rvdev->node, &rproc->rvdevs); |
|
|
|
rvdev->subdev.start = rproc_vdev_do_start; |
|
rvdev->subdev.stop = rproc_vdev_do_stop; |
|
|
|
rproc_add_subdev(rproc, &rvdev->subdev); |
|
|
|
return 0; |
|
|
|
unwind_vring_allocations: |
|
for (i--; i >= 0; i--) |
|
rproc_free_vring(&rvdev->vring[i]); |
|
free_rvdev: |
|
device_unregister(&rvdev->dev); |
|
return ret; |
|
} |
|
|
|
void rproc_vdev_release(struct kref *ref) |
|
{ |
|
struct rproc_vdev *rvdev = container_of(ref, struct rproc_vdev, refcount); |
|
struct rproc_vring *rvring; |
|
struct rproc *rproc = rvdev->rproc; |
|
int id; |
|
|
|
for (id = 0; id < ARRAY_SIZE(rvdev->vring); id++) { |
|
rvring = &rvdev->vring[id]; |
|
rproc_free_vring(rvring); |
|
} |
|
|
|
rproc_remove_subdev(rproc, &rvdev->subdev); |
|
list_del(&rvdev->node); |
|
device_unregister(&rvdev->dev); |
|
} |
|
|
|
/** |
|
* rproc_handle_trace() - handle a shared trace buffer resource |
|
* @rproc: the remote processor |
|
* @ptr: the trace resource descriptor |
|
* @offset: offset of the resource entry |
|
* @avail: size of available data (for sanity checking the image) |
|
* |
|
* In case the remote processor dumps trace logs into memory, |
|
* export it via debugfs. |
|
* |
|
* Currently, the 'da' member of @rsc should contain the device address |
|
* where the remote processor is dumping the traces. Later we could also |
|
* support dynamically allocating this address using the generic |
|
* DMA API (but currently there isn't a use case for that). |
|
* |
|
* Return: 0 on success, or an appropriate error code otherwise |
|
*/ |
|
static int rproc_handle_trace(struct rproc *rproc, void *ptr, |
|
int offset, int avail) |
|
{ |
|
struct fw_rsc_trace *rsc = ptr; |
|
struct rproc_debug_trace *trace; |
|
struct device *dev = &rproc->dev; |
|
char name[15]; |
|
|
|
if (sizeof(*rsc) > avail) { |
|
dev_err(dev, "trace rsc is truncated\n"); |
|
return -EINVAL; |
|
} |
|
|
|
/* make sure reserved bytes are zeroes */ |
|
if (rsc->reserved) { |
|
dev_err(dev, "trace rsc has non zero reserved bytes\n"); |
|
return -EINVAL; |
|
} |
|
|
|
trace = kzalloc(sizeof(*trace), GFP_KERNEL); |
|
if (!trace) |
|
return -ENOMEM; |
|
|
|
/* set the trace buffer dma properties */ |
|
trace->trace_mem.len = rsc->len; |
|
trace->trace_mem.da = rsc->da; |
|
|
|
/* set pointer on rproc device */ |
|
trace->rproc = rproc; |
|
|
|
/* make sure snprintf always null terminates, even if truncating */ |
|
snprintf(name, sizeof(name), "trace%d", rproc->num_traces); |
|
|
|
/* create the debugfs entry */ |
|
trace->tfile = rproc_create_trace_file(name, rproc, trace); |
|
if (!trace->tfile) { |
|
kfree(trace); |
|
return -EINVAL; |
|
} |
|
|
|
list_add_tail(&trace->node, &rproc->traces); |
|
|
|
rproc->num_traces++; |
|
|
|
dev_dbg(dev, "%s added: da 0x%x, len 0x%x\n", |
|
name, rsc->da, rsc->len); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* rproc_handle_devmem() - handle devmem resource entry |
|
* @rproc: remote processor handle |
|
* @ptr: the devmem resource entry |
|
* @offset: offset of the resource entry |
|
* @avail: size of available data (for sanity checking the image) |
|
* |
|
* Remote processors commonly need to access certain on-chip peripherals. |
|
* |
|
* Some of these remote processors access memory via an iommu device, |
|
* and might require us to configure their iommu before they can access |
|
* the on-chip peripherals they need. |
|
* |
|
* This resource entry is a request to map such a peripheral device. |
|
* |
|
* These devmem entries will contain the physical address of the device in |
|
* the 'pa' member. If a specific device address is expected, then 'da' will |
|
* contain it (currently this is the only use case supported). 'len' will |
|
* contain the size of the physical region we need to map. |
|
* |
|
* Currently we just "trust" those devmem entries to contain valid physical |
|
* addresses, but this is going to change: we want the implementations to |
|
* tell us ranges of physical addresses the firmware is allowed to request, |
|
* and not allow firmwares to request access to physical addresses that |
|
* are outside those ranges. |
|
* |
|
* Return: 0 on success, or an appropriate error code otherwise |
|
*/ |
|
static int rproc_handle_devmem(struct rproc *rproc, void *ptr, |
|
int offset, int avail) |
|
{ |
|
struct fw_rsc_devmem *rsc = ptr; |
|
struct rproc_mem_entry *mapping; |
|
struct device *dev = &rproc->dev; |
|
int ret; |
|
|
|
/* no point in handling this resource without a valid iommu domain */ |
|
if (!rproc->domain) |
|
return -EINVAL; |
|
|
|
if (sizeof(*rsc) > avail) { |
|
dev_err(dev, "devmem rsc is truncated\n"); |
|
return -EINVAL; |
|
} |
|
|
|
/* make sure reserved bytes are zeroes */ |
|
if (rsc->reserved) { |
|
dev_err(dev, "devmem rsc has non zero reserved bytes\n"); |
|
return -EINVAL; |
|
} |
|
|
|
mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); |
|
if (!mapping) |
|
return -ENOMEM; |
|
|
|
ret = iommu_map(rproc->domain, rsc->da, rsc->pa, rsc->len, rsc->flags); |
|
if (ret) { |
|
dev_err(dev, "failed to map devmem: %d\n", ret); |
|
goto out; |
|
} |
|
|
|
/* |
|
* We'll need this info later when we'll want to unmap everything |
|
* (e.g. on shutdown). |
|
* |
|
* We can't trust the remote processor not to change the resource |
|
* table, so we must maintain this info independently. |
|
*/ |
|
mapping->da = rsc->da; |
|
mapping->len = rsc->len; |
|
list_add_tail(&mapping->node, &rproc->mappings); |
|
|
|
dev_dbg(dev, "mapped devmem pa 0x%x, da 0x%x, len 0x%x\n", |
|
rsc->pa, rsc->da, rsc->len); |
|
|
|
return 0; |
|
|
|
out: |
|
kfree(mapping); |
|
return ret; |
|
} |
|
|
|
/** |
|
* rproc_alloc_carveout() - allocated specified carveout |
|
* @rproc: rproc handle |
|
* @mem: the memory entry to allocate |
|
* |
|
* This function allocate specified memory entry @mem using |
|
* dma_alloc_coherent() as default allocator |
|
* |
|
* Return: 0 on success, or an appropriate error code otherwise |
|
*/ |
|
static int rproc_alloc_carveout(struct rproc *rproc, |
|
struct rproc_mem_entry *mem) |
|
{ |
|
struct rproc_mem_entry *mapping = NULL; |
|
struct device *dev = &rproc->dev; |
|
dma_addr_t dma; |
|
void *va; |
|
int ret; |
|
|
|
va = dma_alloc_coherent(dev->parent, mem->len, &dma, GFP_KERNEL); |
|
if (!va) { |
|
dev_err(dev->parent, |
|
"failed to allocate dma memory: len 0x%zx\n", |
|
mem->len); |
|
return -ENOMEM; |
|
} |
|
|
|
dev_dbg(dev, "carveout va %pK, dma %pad, len 0x%zx\n", |
|
va, &dma, mem->len); |
|
|
|
if (mem->da != FW_RSC_ADDR_ANY && !rproc->domain) { |
|
/* |
|
* Check requested da is equal to dma address |
|
* and print a warn message in case of missalignment. |
|
* Don't stop rproc_start sequence as coprocessor may |
|
* build pa to da translation on its side. |
|
*/ |
|
if (mem->da != (u32)dma) |
|
dev_warn(dev->parent, |
|
"Allocated carveout doesn't fit device address request\n"); |
|
} |
|
|
|
/* |
|
* Ok, this is non-standard. |
|
* |
|
* Sometimes we can't rely on the generic iommu-based DMA API |
|
* to dynamically allocate the device address and then set the IOMMU |
|
* tables accordingly, because some remote processors might |
|
* _require_ us to use hard coded device addresses that their |
|
* firmware was compiled with. |
|
* |
|
* In this case, we must use the IOMMU API directly and map |
|
* the memory to the device address as expected by the remote |
|
* processor. |
|
* |
|
* Obviously such remote processor devices should not be configured |
|
* to use the iommu-based DMA API: we expect 'dma' to contain the |
|
* physical address in this case. |
|
*/ |
|
if (mem->da != FW_RSC_ADDR_ANY && rproc->domain) { |
|
mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); |
|
if (!mapping) { |
|
ret = -ENOMEM; |
|
goto dma_free; |
|
} |
|
|
|
ret = iommu_map(rproc->domain, mem->da, dma, mem->len, |
|
mem->flags); |
|
if (ret) { |
|
dev_err(dev, "iommu_map failed: %d\n", ret); |
|
goto free_mapping; |
|
} |
|
|
|
/* |
|
* We'll need this info later when we'll want to unmap |
|
* everything (e.g. on shutdown). |
|
* |
|
* We can't trust the remote processor not to change the |
|
* resource table, so we must maintain this info independently. |
|
*/ |
|
mapping->da = mem->da; |
|
mapping->len = mem->len; |
|
list_add_tail(&mapping->node, &rproc->mappings); |
|
|
|
dev_dbg(dev, "carveout mapped 0x%x to %pad\n", |
|
mem->da, &dma); |
|
} |
|
|
|
if (mem->da == FW_RSC_ADDR_ANY) { |
|
/* Update device address as undefined by requester */ |
|
if ((u64)dma & HIGH_BITS_MASK) |
|
dev_warn(dev, "DMA address cast in 32bit to fit resource table format\n"); |
|
|
|
mem->da = (u32)dma; |
|
} |
|
|
|
mem->dma = dma; |
|
mem->va = va; |
|
|
|
return 0; |
|
|
|
free_mapping: |
|
kfree(mapping); |
|
dma_free: |
|
dma_free_coherent(dev->parent, mem->len, va, dma); |
|
return ret; |
|
} |
|
|
|
/** |
|
* rproc_release_carveout() - release acquired carveout |
|
* @rproc: rproc handle |
|
* @mem: the memory entry to release |
|
* |
|
* This function releases specified memory entry @mem allocated via |
|
* rproc_alloc_carveout() function by @rproc. |
|
* |
|
* Return: 0 on success, or an appropriate error code otherwise |
|
*/ |
|
static int rproc_release_carveout(struct rproc *rproc, |
|
struct rproc_mem_entry *mem) |
|
{ |
|
struct device *dev = &rproc->dev; |
|
|
|
/* clean up carveout allocations */ |
|
dma_free_coherent(dev->parent, mem->len, mem->va, mem->dma); |
|
return 0; |
|
} |
|
|
|
/** |
|
* rproc_handle_carveout() - handle phys contig memory allocation requests |
|
* @rproc: rproc handle |
|
* @ptr: the resource entry |
|
* @offset: offset of the resource entry |
|
* @avail: size of available data (for image validation) |
|
* |
|
* This function will handle firmware requests for allocation of physically |
|
* contiguous memory regions. |
|
* |
|
* These request entries should come first in the firmware's resource table, |
|
* as other firmware entries might request placing other data objects inside |
|
* these memory regions (e.g. data/code segments, trace resource entries, ...). |
|
* |
|
* Allocating memory this way helps utilizing the reserved physical memory |
|
* (e.g. CMA) more efficiently, and also minimizes the number of TLB entries |
|
* needed to map it (in case @rproc is using an IOMMU). Reducing the TLB |
|
* pressure is important; it may have a substantial impact on performance. |
|
* |
|
* Return: 0 on success, or an appropriate error code otherwise |
|
*/ |
|
static int rproc_handle_carveout(struct rproc *rproc, |
|
void *ptr, int offset, int avail) |
|
{ |
|
struct fw_rsc_carveout *rsc = ptr; |
|
struct rproc_mem_entry *carveout; |
|
struct device *dev = &rproc->dev; |
|
|
|
if (sizeof(*rsc) > avail) { |
|
dev_err(dev, "carveout rsc is truncated\n"); |
|
return -EINVAL; |
|
} |
|
|
|
/* make sure reserved bytes are zeroes */ |
|
if (rsc->reserved) { |
|
dev_err(dev, "carveout rsc has non zero reserved bytes\n"); |
|
return -EINVAL; |
|
} |
|
|
|
dev_dbg(dev, "carveout rsc: name: %s, da 0x%x, pa 0x%x, len 0x%x, flags 0x%x\n", |
|
rsc->name, rsc->da, rsc->pa, rsc->len, rsc->flags); |
|
|
|
/* |
|
* Check carveout rsc already part of a registered carveout, |
|
* Search by name, then check the da and length |
|
*/ |
|
carveout = rproc_find_carveout_by_name(rproc, rsc->name); |
|
|
|
if (carveout) { |
|
if (carveout->rsc_offset != FW_RSC_ADDR_ANY) { |
|
dev_err(dev, |
|
"Carveout already associated to resource table\n"); |
|
return -ENOMEM; |
|
} |
|
|
|
if (rproc_check_carveout_da(rproc, carveout, rsc->da, rsc->len)) |
|
return -ENOMEM; |
|
|
|
/* Update memory carveout with resource table info */ |
|
carveout->rsc_offset = offset; |
|
carveout->flags = rsc->flags; |
|
|
|
return 0; |
|
} |
|
|
|
/* Register carveout in in list */ |
|
carveout = rproc_mem_entry_init(dev, NULL, 0, rsc->len, rsc->da, |
|
rproc_alloc_carveout, |
|
rproc_release_carveout, rsc->name); |
|
if (!carveout) { |
|
dev_err(dev, "Can't allocate memory entry structure\n"); |
|
return -ENOMEM; |
|
} |
|
|
|
carveout->flags = rsc->flags; |
|
carveout->rsc_offset = offset; |
|
rproc_add_carveout(rproc, carveout); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* rproc_add_carveout() - register an allocated carveout region |
|
* @rproc: rproc handle |
|
* @mem: memory entry to register |
|
* |
|
* This function registers specified memory entry in @rproc carveouts list. |
|
* Specified carveout should have been allocated before registering. |
|
*/ |
|
void rproc_add_carveout(struct rproc *rproc, struct rproc_mem_entry *mem) |
|
{ |
|
list_add_tail(&mem->node, &rproc->carveouts); |
|
} |
|
EXPORT_SYMBOL(rproc_add_carveout); |
|
|
|
/** |
|
* rproc_mem_entry_init() - allocate and initialize rproc_mem_entry struct |
|
* @dev: pointer on device struct |
|
* @va: virtual address |
|
* @dma: dma address |
|
* @len: memory carveout length |
|
* @da: device address |
|
* @alloc: memory carveout allocation function |
|
* @release: memory carveout release function |
|
* @name: carveout name |
|
* |
|
* This function allocates a rproc_mem_entry struct and fill it with parameters |
|
* provided by client. |
|
* |
|
* Return: a valid pointer on success, or NULL on failure |
|
*/ |
|
__printf(8, 9) |
|
struct rproc_mem_entry * |
|
rproc_mem_entry_init(struct device *dev, |
|
void *va, dma_addr_t dma, size_t len, u32 da, |
|
int (*alloc)(struct rproc *, struct rproc_mem_entry *), |
|
int (*release)(struct rproc *, struct rproc_mem_entry *), |
|
const char *name, ...) |
|
{ |
|
struct rproc_mem_entry *mem; |
|
va_list args; |
|
|
|
mem = kzalloc(sizeof(*mem), GFP_KERNEL); |
|
if (!mem) |
|
return mem; |
|
|
|
mem->va = va; |
|
mem->dma = dma; |
|
mem->da = da; |
|
mem->len = len; |
|
mem->alloc = alloc; |
|
mem->release = release; |
|
mem->rsc_offset = FW_RSC_ADDR_ANY; |
|
mem->of_resm_idx = -1; |
|
|
|
va_start(args, name); |
|
vsnprintf(mem->name, sizeof(mem->name), name, args); |
|
va_end(args); |
|
|
|
return mem; |
|
} |
|
EXPORT_SYMBOL(rproc_mem_entry_init); |
|
|
|
/** |
|
* rproc_of_resm_mem_entry_init() - allocate and initialize rproc_mem_entry struct |
|
* from a reserved memory phandle |
|
* @dev: pointer on device struct |
|
* @of_resm_idx: reserved memory phandle index in "memory-region" |
|
* @len: memory carveout length |
|
* @da: device address |
|
* @name: carveout name |
|
* |
|
* This function allocates a rproc_mem_entry struct and fill it with parameters |
|
* provided by client. |
|
* |
|
* Return: a valid pointer on success, or NULL on failure |
|
*/ |
|
__printf(5, 6) |
|
struct rproc_mem_entry * |
|
rproc_of_resm_mem_entry_init(struct device *dev, u32 of_resm_idx, size_t len, |
|
u32 da, const char *name, ...) |
|
{ |
|
struct rproc_mem_entry *mem; |
|
va_list args; |
|
|
|
mem = kzalloc(sizeof(*mem), GFP_KERNEL); |
|
if (!mem) |
|
return mem; |
|
|
|
mem->da = da; |
|
mem->len = len; |
|
mem->rsc_offset = FW_RSC_ADDR_ANY; |
|
mem->of_resm_idx = of_resm_idx; |
|
|
|
va_start(args, name); |
|
vsnprintf(mem->name, sizeof(mem->name), name, args); |
|
va_end(args); |
|
|
|
return mem; |
|
} |
|
EXPORT_SYMBOL(rproc_of_resm_mem_entry_init); |
|
|
|
/** |
|
* rproc_of_parse_firmware() - parse and return the firmware-name |
|
* @dev: pointer on device struct representing a rproc |
|
* @index: index to use for the firmware-name retrieval |
|
* @fw_name: pointer to a character string, in which the firmware |
|
* name is returned on success and unmodified otherwise. |
|
* |
|
* This is an OF helper function that parses a device's DT node for |
|
* the "firmware-name" property and returns the firmware name pointer |
|
* in @fw_name on success. |
|
* |
|
* Return: 0 on success, or an appropriate failure. |
|
*/ |
|
int rproc_of_parse_firmware(struct device *dev, int index, const char **fw_name) |
|
{ |
|
int ret; |
|
|
|
ret = of_property_read_string_index(dev->of_node, "firmware-name", |
|
index, fw_name); |
|
return ret ? ret : 0; |
|
} |
|
EXPORT_SYMBOL(rproc_of_parse_firmware); |
|
|
|
/* |
|
* A lookup table for resource handlers. The indices are defined in |
|
* enum fw_resource_type. |
|
*/ |
|
static rproc_handle_resource_t rproc_loading_handlers[RSC_LAST] = { |
|
[RSC_CARVEOUT] = rproc_handle_carveout, |
|
[RSC_DEVMEM] = rproc_handle_devmem, |
|
[RSC_TRACE] = rproc_handle_trace, |
|
[RSC_VDEV] = rproc_handle_vdev, |
|
}; |
|
|
|
/* handle firmware resource entries before booting the remote processor */ |
|
static int rproc_handle_resources(struct rproc *rproc, |
|
rproc_handle_resource_t handlers[RSC_LAST]) |
|
{ |
|
struct device *dev = &rproc->dev; |
|
rproc_handle_resource_t handler; |
|
int ret = 0, i; |
|
|
|
if (!rproc->table_ptr) |
|
return 0; |
|
|
|
for (i = 0; i < rproc->table_ptr->num; i++) { |
|
int offset = rproc->table_ptr->offset[i]; |
|
struct fw_rsc_hdr *hdr = (void *)rproc->table_ptr + offset; |
|
int avail = rproc->table_sz - offset - sizeof(*hdr); |
|
void *rsc = (void *)hdr + sizeof(*hdr); |
|
|
|
/* make sure table isn't truncated */ |
|
if (avail < 0) { |
|
dev_err(dev, "rsc table is truncated\n"); |
|
return -EINVAL; |
|
} |
|
|
|
dev_dbg(dev, "rsc: type %d\n", hdr->type); |
|
|
|
if (hdr->type >= RSC_VENDOR_START && |
|
hdr->type <= RSC_VENDOR_END) { |
|
ret = rproc_handle_rsc(rproc, hdr->type, rsc, |
|
offset + sizeof(*hdr), avail); |
|
if (ret == RSC_HANDLED) |
|
continue; |
|
else if (ret < 0) |
|
break; |
|
|
|
dev_warn(dev, "unsupported vendor resource %d\n", |
|
hdr->type); |
|
continue; |
|
} |
|
|
|
if (hdr->type >= RSC_LAST) { |
|
dev_warn(dev, "unsupported resource %d\n", hdr->type); |
|
continue; |
|
} |
|
|
|
handler = handlers[hdr->type]; |
|
if (!handler) |
|
continue; |
|
|
|
ret = handler(rproc, rsc, offset + sizeof(*hdr), avail); |
|
if (ret) |
|
break; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static int rproc_prepare_subdevices(struct rproc *rproc) |
|
{ |
|
struct rproc_subdev *subdev; |
|
int ret; |
|
|
|
list_for_each_entry(subdev, &rproc->subdevs, node) { |
|
if (subdev->prepare) { |
|
ret = subdev->prepare(subdev); |
|
if (ret) |
|
goto unroll_preparation; |
|
} |
|
} |
|
|
|
return 0; |
|
|
|
unroll_preparation: |
|
list_for_each_entry_continue_reverse(subdev, &rproc->subdevs, node) { |
|
if (subdev->unprepare) |
|
subdev->unprepare(subdev); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static int rproc_start_subdevices(struct rproc *rproc) |
|
{ |
|
struct rproc_subdev *subdev; |
|
int ret; |
|
|
|
list_for_each_entry(subdev, &rproc->subdevs, node) { |
|
if (subdev->start) { |
|
ret = subdev->start(subdev); |
|
if (ret) |
|
goto unroll_registration; |
|
} |
|
} |
|
|
|
return 0; |
|
|
|
unroll_registration: |
|
list_for_each_entry_continue_reverse(subdev, &rproc->subdevs, node) { |
|
if (subdev->stop) |
|
subdev->stop(subdev, true); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static void rproc_stop_subdevices(struct rproc *rproc, bool crashed) |
|
{ |
|
struct rproc_subdev *subdev; |
|
|
|
list_for_each_entry_reverse(subdev, &rproc->subdevs, node) { |
|
if (subdev->stop) |
|
subdev->stop(subdev, crashed); |
|
} |
|
} |
|
|
|
static void rproc_unprepare_subdevices(struct rproc *rproc) |
|
{ |
|
struct rproc_subdev *subdev; |
|
|
|
list_for_each_entry_reverse(subdev, &rproc->subdevs, node) { |
|
if (subdev->unprepare) |
|
subdev->unprepare(subdev); |
|
} |
|
} |
|
|
|
/** |
|
* rproc_alloc_registered_carveouts() - allocate all carveouts registered |
|
* in the list |
|
* @rproc: the remote processor handle |
|
* |
|
* This function parses registered carveout list, performs allocation |
|
* if alloc() ops registered and updates resource table information |
|
* if rsc_offset set. |
|
* |
|
* Return: 0 on success |
|
*/ |
|
static int rproc_alloc_registered_carveouts(struct rproc *rproc) |
|
{ |
|
struct rproc_mem_entry *entry, *tmp; |
|
struct fw_rsc_carveout *rsc; |
|
struct device *dev = &rproc->dev; |
|
u64 pa; |
|
int ret; |
|
|
|
list_for_each_entry_safe(entry, tmp, &rproc->carveouts, node) { |
|
if (entry->alloc) { |
|
ret = entry->alloc(rproc, entry); |
|
if (ret) { |
|
dev_err(dev, "Unable to allocate carveout %s: %d\n", |
|
entry->name, ret); |
|
return -ENOMEM; |
|
} |
|
} |
|
|
|
if (entry->rsc_offset != FW_RSC_ADDR_ANY) { |
|
/* update resource table */ |
|
rsc = (void *)rproc->table_ptr + entry->rsc_offset; |
|
|
|
/* |
|
* Some remote processors might need to know the pa |
|
* even though they are behind an IOMMU. E.g., OMAP4's |
|
* remote M3 processor needs this so it can control |
|
* on-chip hardware accelerators that are not behind |
|
* the IOMMU, and therefor must know the pa. |
|
* |
|
* Generally we don't want to expose physical addresses |
|
* if we don't have to (remote processors are generally |
|
* _not_ trusted), so we might want to do this only for |
|
* remote processor that _must_ have this (e.g. OMAP4's |
|
* dual M3 subsystem). |
|
* |
|
* Non-IOMMU processors might also want to have this info. |
|
* In this case, the device address and the physical address |
|
* are the same. |
|
*/ |
|
|
|
/* Use va if defined else dma to generate pa */ |
|
if (entry->va) |
|
pa = (u64)rproc_va_to_pa(entry->va); |
|
else |
|
pa = (u64)entry->dma; |
|
|
|
if (((u64)pa) & HIGH_BITS_MASK) |
|
dev_warn(dev, |
|
"Physical address cast in 32bit to fit resource table format\n"); |
|
|
|
rsc->pa = (u32)pa; |
|
rsc->da = entry->da; |
|
rsc->len = entry->len; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
|
|
/** |
|
* rproc_resource_cleanup() - clean up and free all acquired resources |
|
* @rproc: rproc handle |
|
* |
|
* This function will free all resources acquired for @rproc, and it |
|
* is called whenever @rproc either shuts down or fails to boot. |
|
*/ |
|
void rproc_resource_cleanup(struct rproc *rproc) |
|
{ |
|
struct rproc_mem_entry *entry, *tmp; |
|
struct rproc_debug_trace *trace, *ttmp; |
|
struct rproc_vdev *rvdev, *rvtmp; |
|
struct device *dev = &rproc->dev; |
|
|
|
/* clean up debugfs trace entries */ |
|
list_for_each_entry_safe(trace, ttmp, &rproc->traces, node) { |
|
rproc_remove_trace_file(trace->tfile); |
|
rproc->num_traces--; |
|
list_del(&trace->node); |
|
kfree(trace); |
|
} |
|
|
|
/* clean up iommu mapping entries */ |
|
list_for_each_entry_safe(entry, tmp, &rproc->mappings, node) { |
|
size_t unmapped; |
|
|
|
unmapped = iommu_unmap(rproc->domain, entry->da, entry->len); |
|
if (unmapped != entry->len) { |
|
/* nothing much to do besides complaining */ |
|
dev_err(dev, "failed to unmap %zx/%zu\n", entry->len, |
|
unmapped); |
|
} |
|
|
|
list_del(&entry->node); |
|
kfree(entry); |
|
} |
|
|
|
/* clean up carveout allocations */ |
|
list_for_each_entry_safe(entry, tmp, &rproc->carveouts, node) { |
|
if (entry->release) |
|
entry->release(rproc, entry); |
|
list_del(&entry->node); |
|
kfree(entry); |
|
} |
|
|
|
/* clean up remote vdev entries */ |
|
list_for_each_entry_safe(rvdev, rvtmp, &rproc->rvdevs, node) |
|
kref_put(&rvdev->refcount, rproc_vdev_release); |
|
|
|
rproc_coredump_cleanup(rproc); |
|
} |
|
EXPORT_SYMBOL(rproc_resource_cleanup); |
|
|
|
static int rproc_start(struct rproc *rproc, const struct firmware *fw) |
|
{ |
|
struct resource_table *loaded_table; |
|
struct device *dev = &rproc->dev; |
|
int ret; |
|
|
|
/* load the ELF segments to memory */ |
|
ret = rproc_load_segments(rproc, fw); |
|
if (ret) { |
|
dev_err(dev, "Failed to load program segments: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
/* |
|
* The starting device has been given the rproc->cached_table as the |
|
* resource table. The address of the vring along with the other |
|
* allocated resources (carveouts etc) is stored in cached_table. |
|
* In order to pass this information to the remote device we must copy |
|
* this information to device memory. We also update the table_ptr so |
|
* that any subsequent changes will be applied to the loaded version. |
|
*/ |
|
loaded_table = rproc_find_loaded_rsc_table(rproc, fw); |
|
if (loaded_table) { |
|
memcpy(loaded_table, rproc->cached_table, rproc->table_sz); |
|
rproc->table_ptr = loaded_table; |
|
} |
|
|
|
ret = rproc_prepare_subdevices(rproc); |
|
if (ret) { |
|
dev_err(dev, "failed to prepare subdevices for %s: %d\n", |
|
rproc->name, ret); |
|
goto reset_table_ptr; |
|
} |
|
|
|
/* power up the remote processor */ |
|
ret = rproc->ops->start(rproc); |
|
if (ret) { |
|
dev_err(dev, "can't start rproc %s: %d\n", rproc->name, ret); |
|
goto unprepare_subdevices; |
|
} |
|
|
|
/* Start any subdevices for the remote processor */ |
|
ret = rproc_start_subdevices(rproc); |
|
if (ret) { |
|
dev_err(dev, "failed to probe subdevices for %s: %d\n", |
|
rproc->name, ret); |
|
goto stop_rproc; |
|
} |
|
|
|
rproc->state = RPROC_RUNNING; |
|
|
|
dev_info(dev, "remote processor %s is now up\n", rproc->name); |
|
|
|
return 0; |
|
|
|
stop_rproc: |
|
rproc->ops->stop(rproc); |
|
unprepare_subdevices: |
|
rproc_unprepare_subdevices(rproc); |
|
reset_table_ptr: |
|
rproc->table_ptr = rproc->cached_table; |
|
|
|
return ret; |
|
} |
|
|
|
static int __rproc_attach(struct rproc *rproc) |
|
{ |
|
struct device *dev = &rproc->dev; |
|
int ret; |
|
|
|
ret = rproc_prepare_subdevices(rproc); |
|
if (ret) { |
|
dev_err(dev, "failed to prepare subdevices for %s: %d\n", |
|
rproc->name, ret); |
|
goto out; |
|
} |
|
|
|
/* Attach to the remote processor */ |
|
ret = rproc_attach_device(rproc); |
|
if (ret) { |
|
dev_err(dev, "can't attach to rproc %s: %d\n", |
|
rproc->name, ret); |
|
goto unprepare_subdevices; |
|
} |
|
|
|
/* Start any subdevices for the remote processor */ |
|
ret = rproc_start_subdevices(rproc); |
|
if (ret) { |
|
dev_err(dev, "failed to probe subdevices for %s: %d\n", |
|
rproc->name, ret); |
|
goto stop_rproc; |
|
} |
|
|
|
rproc->state = RPROC_ATTACHED; |
|
|
|
dev_info(dev, "remote processor %s is now attached\n", rproc->name); |
|
|
|
return 0; |
|
|
|
stop_rproc: |
|
rproc->ops->stop(rproc); |
|
unprepare_subdevices: |
|
rproc_unprepare_subdevices(rproc); |
|
out: |
|
return ret; |
|
} |
|
|
|
/* |
|
* take a firmware and boot a remote processor with it. |
|
*/ |
|
static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw) |
|
{ |
|
struct device *dev = &rproc->dev; |
|
const char *name = rproc->firmware; |
|
int ret; |
|
|
|
ret = rproc_fw_sanity_check(rproc, fw); |
|
if (ret) |
|
return ret; |
|
|
|
dev_info(dev, "Booting fw image %s, size %zd\n", name, fw->size); |
|
|
|
/* |
|
* if enabling an IOMMU isn't relevant for this rproc, this is |
|
* just a nop |
|
*/ |
|
ret = rproc_enable_iommu(rproc); |
|
if (ret) { |
|
dev_err(dev, "can't enable iommu: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
/* Prepare rproc for firmware loading if needed */ |
|
ret = rproc_prepare_device(rproc); |
|
if (ret) { |
|
dev_err(dev, "can't prepare rproc %s: %d\n", rproc->name, ret); |
|
goto disable_iommu; |
|
} |
|
|
|
rproc->bootaddr = rproc_get_boot_addr(rproc, fw); |
|
|
|
/* Load resource table, core dump segment list etc from the firmware */ |
|
ret = rproc_parse_fw(rproc, fw); |
|
if (ret) |
|
goto unprepare_rproc; |
|
|
|
/* reset max_notifyid */ |
|
rproc->max_notifyid = -1; |
|
|
|
/* reset handled vdev */ |
|
rproc->nb_vdev = 0; |
|
|
|
/* handle fw resources which are required to boot rproc */ |
|
ret = rproc_handle_resources(rproc, rproc_loading_handlers); |
|
if (ret) { |
|
dev_err(dev, "Failed to process resources: %d\n", ret); |
|
goto clean_up_resources; |
|
} |
|
|
|
/* Allocate carveout resources associated to rproc */ |
|
ret = rproc_alloc_registered_carveouts(rproc); |
|
if (ret) { |
|
dev_err(dev, "Failed to allocate associated carveouts: %d\n", |
|
ret); |
|
goto clean_up_resources; |
|
} |
|
|
|
ret = rproc_start(rproc, fw); |
|
if (ret) |
|
goto clean_up_resources; |
|
|
|
return 0; |
|
|
|
clean_up_resources: |
|
rproc_resource_cleanup(rproc); |
|
kfree(rproc->cached_table); |
|
rproc->cached_table = NULL; |
|
rproc->table_ptr = NULL; |
|
unprepare_rproc: |
|
/* release HW resources if needed */ |
|
rproc_unprepare_device(rproc); |
|
disable_iommu: |
|
rproc_disable_iommu(rproc); |
|
return ret; |
|
} |
|
|
|
static int rproc_set_rsc_table(struct rproc *rproc) |
|
{ |
|
struct resource_table *table_ptr; |
|
struct device *dev = &rproc->dev; |
|
size_t table_sz; |
|
int ret; |
|
|
|
table_ptr = rproc_get_loaded_rsc_table(rproc, &table_sz); |
|
if (!table_ptr) { |
|
/* Not having a resource table is acceptable */ |
|
return 0; |
|
} |
|
|
|
if (IS_ERR(table_ptr)) { |
|
ret = PTR_ERR(table_ptr); |
|
dev_err(dev, "can't load resource table: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
/* |
|
* If it is possible to detach the remote processor, keep an untouched |
|
* copy of the resource table. That way we can start fresh again when |
|
* the remote processor is re-attached, that is: |
|
* |
|
* DETACHED -> ATTACHED -> DETACHED -> ATTACHED |
|
* |
|
* Free'd in rproc_reset_rsc_table_on_detach() and |
|
* rproc_reset_rsc_table_on_stop(). |
|
*/ |
|
if (rproc->ops->detach) { |
|
rproc->clean_table = kmemdup(table_ptr, table_sz, GFP_KERNEL); |
|
if (!rproc->clean_table) |
|
return -ENOMEM; |
|
} else { |
|
rproc->clean_table = NULL; |
|
} |
|
|
|
rproc->cached_table = NULL; |
|
rproc->table_ptr = table_ptr; |
|
rproc->table_sz = table_sz; |
|
|
|
return 0; |
|
} |
|
|
|
static int rproc_reset_rsc_table_on_detach(struct rproc *rproc) |
|
{ |
|
struct resource_table *table_ptr; |
|
|
|
/* A resource table was never retrieved, nothing to do here */ |
|
if (!rproc->table_ptr) |
|
return 0; |
|
|
|
/* |
|
* If we made it to this point a clean_table _must_ have been |
|
* allocated in rproc_set_rsc_table(). If one isn't present |
|
* something went really wrong and we must complain. |
|
*/ |
|
if (WARN_ON(!rproc->clean_table)) |
|
return -EINVAL; |
|
|
|
/* Remember where the external entity installed the resource table */ |
|
table_ptr = rproc->table_ptr; |
|
|
|
/* |
|
* If we made it here the remote processor was started by another |
|
* entity and a cache table doesn't exist. As such make a copy of |
|
* the resource table currently used by the remote processor and |
|
* use that for the rest of the shutdown process. The memory |
|
* allocated here is free'd in rproc_detach(). |
|
*/ |
|
rproc->cached_table = kmemdup(rproc->table_ptr, |
|
rproc->table_sz, GFP_KERNEL); |
|
if (!rproc->cached_table) |
|
return -ENOMEM; |
|
|
|
/* |
|
* Use a copy of the resource table for the remainder of the |
|
* shutdown process. |
|
*/ |
|
rproc->table_ptr = rproc->cached_table; |
|
|
|
/* |
|
* Reset the memory area where the firmware loaded the resource table |
|
* to its original value. That way when we re-attach the remote |
|
* processor the resource table is clean and ready to be used again. |
|
*/ |
|
memcpy(table_ptr, rproc->clean_table, rproc->table_sz); |
|
|
|
/* |
|
* The clean resource table is no longer needed. Allocated in |
|
* rproc_set_rsc_table(). |
|
*/ |
|
kfree(rproc->clean_table); |
|
|
|
return 0; |
|
} |
|
|
|
static int rproc_reset_rsc_table_on_stop(struct rproc *rproc) |
|
{ |
|
/* A resource table was never retrieved, nothing to do here */ |
|
if (!rproc->table_ptr) |
|
return 0; |
|
|
|
/* |
|
* If a cache table exists the remote processor was started by |
|
* the remoteproc core. That cache table should be used for |
|
* the rest of the shutdown process. |
|
*/ |
|
if (rproc->cached_table) |
|
goto out; |
|
|
|
/* |
|
* If we made it here the remote processor was started by another |
|
* entity and a cache table doesn't exist. As such make a copy of |
|
* the resource table currently used by the remote processor and |
|
* use that for the rest of the shutdown process. The memory |
|
* allocated here is free'd in rproc_shutdown(). |
|
*/ |
|
rproc->cached_table = kmemdup(rproc->table_ptr, |
|
rproc->table_sz, GFP_KERNEL); |
|
if (!rproc->cached_table) |
|
return -ENOMEM; |
|
|
|
/* |
|
* Since the remote processor is being switched off the clean table |
|
* won't be needed. Allocated in rproc_set_rsc_table(). |
|
*/ |
|
kfree(rproc->clean_table); |
|
|
|
out: |
|
/* |
|
* Use a copy of the resource table for the remainder of the |
|
* shutdown process. |
|
*/ |
|
rproc->table_ptr = rproc->cached_table; |
|
return 0; |
|
} |
|
|
|
/* |
|
* Attach to remote processor - similar to rproc_fw_boot() but without |
|
* the steps that deal with the firmware image. |
|
*/ |
|
static int rproc_attach(struct rproc *rproc) |
|
{ |
|
struct device *dev = &rproc->dev; |
|
int ret; |
|
|
|
/* |
|
* if enabling an IOMMU isn't relevant for this rproc, this is |
|
* just a nop |
|
*/ |
|
ret = rproc_enable_iommu(rproc); |
|
if (ret) { |
|
dev_err(dev, "can't enable iommu: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
/* Do anything that is needed to boot the remote processor */ |
|
ret = rproc_prepare_device(rproc); |
|
if (ret) { |
|
dev_err(dev, "can't prepare rproc %s: %d\n", rproc->name, ret); |
|
goto disable_iommu; |
|
} |
|
|
|
ret = rproc_set_rsc_table(rproc); |
|
if (ret) { |
|
dev_err(dev, "can't load resource table: %d\n", ret); |
|
goto unprepare_device; |
|
} |
|
|
|
/* reset max_notifyid */ |
|
rproc->max_notifyid = -1; |
|
|
|
/* reset handled vdev */ |
|
rproc->nb_vdev = 0; |
|
|
|
/* |
|
* Handle firmware resources required to attach to a remote processor. |
|
* Because we are attaching rather than booting the remote processor, |
|
* we expect the platform driver to properly set rproc->table_ptr. |
|
*/ |
|
ret = rproc_handle_resources(rproc, rproc_loading_handlers); |
|
if (ret) { |
|
dev_err(dev, "Failed to process resources: %d\n", ret); |
|
goto unprepare_device; |
|
} |
|
|
|
/* Allocate carveout resources associated to rproc */ |
|
ret = rproc_alloc_registered_carveouts(rproc); |
|
if (ret) { |
|
dev_err(dev, "Failed to allocate associated carveouts: %d\n", |
|
ret); |
|
goto clean_up_resources; |
|
} |
|
|
|
ret = __rproc_attach(rproc); |
|
if (ret) |
|
goto clean_up_resources; |
|
|
|
return 0; |
|
|
|
clean_up_resources: |
|
rproc_resource_cleanup(rproc); |
|
unprepare_device: |
|
/* release HW resources if needed */ |
|
rproc_unprepare_device(rproc); |
|
disable_iommu: |
|
rproc_disable_iommu(rproc); |
|
return ret; |
|
} |
|
|
|
/* |
|
* take a firmware and boot it up. |
|
* |
|
* Note: this function is called asynchronously upon registration of the |
|
* remote processor (so we must wait until it completes before we try |
|
* to unregister the device. one other option is just to use kref here, |
|
* that might be cleaner). |
|
*/ |
|
static void rproc_auto_boot_callback(const struct firmware *fw, void *context) |
|
{ |
|
struct rproc *rproc = context; |
|
|
|
rproc_boot(rproc); |
|
|
|
release_firmware(fw); |
|
} |
|
|
|
static int rproc_trigger_auto_boot(struct rproc *rproc) |
|
{ |
|
int ret; |
|
|
|
/* |
|
* Since the remote processor is in a detached state, it has already |
|
* been booted by another entity. As such there is no point in waiting |
|
* for a firmware image to be loaded, we can simply initiate the process |
|
* of attaching to it immediately. |
|
*/ |
|
if (rproc->state == RPROC_DETACHED) |
|
return rproc_boot(rproc); |
|
|
|
/* |
|
* We're initiating an asynchronous firmware loading, so we can |
|
* be built-in kernel code, without hanging the boot process. |
|
*/ |
|
ret = request_firmware_nowait(THIS_MODULE, FW_ACTION_UEVENT, |
|
rproc->firmware, &rproc->dev, GFP_KERNEL, |
|
rproc, rproc_auto_boot_callback); |
|
if (ret < 0) |
|
dev_err(&rproc->dev, "request_firmware_nowait err: %d\n", ret); |
|
|
|
return ret; |
|
} |
|
|
|
static int rproc_stop(struct rproc *rproc, bool crashed) |
|
{ |
|
struct device *dev = &rproc->dev; |
|
int ret; |
|
|
|
/* No need to continue if a stop() operation has not been provided */ |
|
if (!rproc->ops->stop) |
|
return -EINVAL; |
|
|
|
/* Stop any subdevices for the remote processor */ |
|
rproc_stop_subdevices(rproc, crashed); |
|
|
|
/* the installed resource table is no longer accessible */ |
|
ret = rproc_reset_rsc_table_on_stop(rproc); |
|
if (ret) { |
|
dev_err(dev, "can't reset resource table: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
|
|
/* power off the remote processor */ |
|
ret = rproc->ops->stop(rproc); |
|
if (ret) { |
|
dev_err(dev, "can't stop rproc: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
rproc_unprepare_subdevices(rproc); |
|
|
|
rproc->state = RPROC_OFFLINE; |
|
|
|
dev_info(dev, "stopped remote processor %s\n", rproc->name); |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* __rproc_detach(): Does the opposite of __rproc_attach() |
|
*/ |
|
static int __rproc_detach(struct rproc *rproc) |
|
{ |
|
struct device *dev = &rproc->dev; |
|
int ret; |
|
|
|
/* No need to continue if a detach() operation has not been provided */ |
|
if (!rproc->ops->detach) |
|
return -EINVAL; |
|
|
|
/* Stop any subdevices for the remote processor */ |
|
rproc_stop_subdevices(rproc, false); |
|
|
|
/* the installed resource table is no longer accessible */ |
|
ret = rproc_reset_rsc_table_on_detach(rproc); |
|
if (ret) { |
|
dev_err(dev, "can't reset resource table: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
/* Tell the remote processor the core isn't available anymore */ |
|
ret = rproc->ops->detach(rproc); |
|
if (ret) { |
|
dev_err(dev, "can't detach from rproc: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
rproc_unprepare_subdevices(rproc); |
|
|
|
rproc->state = RPROC_DETACHED; |
|
|
|
dev_info(dev, "detached remote processor %s\n", rproc->name); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* rproc_trigger_recovery() - recover a remoteproc |
|
* @rproc: the remote processor |
|
* |
|
* The recovery is done by resetting all the virtio devices, that way all the |
|
* rpmsg drivers will be reseted along with the remote processor making the |
|
* remoteproc functional again. |
|
* |
|
* This function can sleep, so it cannot be called from atomic context. |
|
* |
|
* Return: 0 on success or a negative value upon failure |
|
*/ |
|
int rproc_trigger_recovery(struct rproc *rproc) |
|
{ |
|
const struct firmware *firmware_p; |
|
struct device *dev = &rproc->dev; |
|
int ret; |
|
|
|
ret = mutex_lock_interruptible(&rproc->lock); |
|
if (ret) |
|
return ret; |
|
|
|
/* State could have changed before we got the mutex */ |
|
if (rproc->state != RPROC_CRASHED) |
|
goto unlock_mutex; |
|
|
|
dev_err(dev, "recovering %s\n", rproc->name); |
|
|
|
ret = rproc_stop(rproc, true); |
|
if (ret) |
|
goto unlock_mutex; |
|
|
|
/* generate coredump */ |
|
rproc->ops->coredump(rproc); |
|
|
|
/* load firmware */ |
|
ret = request_firmware(&firmware_p, rproc->firmware, dev); |
|
if (ret < 0) { |
|
dev_err(dev, "request_firmware failed: %d\n", ret); |
|
goto unlock_mutex; |
|
} |
|
|
|
/* boot the remote processor up again */ |
|
ret = rproc_start(rproc, firmware_p); |
|
|
|
release_firmware(firmware_p); |
|
|
|
unlock_mutex: |
|
mutex_unlock(&rproc->lock); |
|
return ret; |
|
} |
|
|
|
/** |
|
* rproc_crash_handler_work() - handle a crash |
|
* @work: work treating the crash |
|
* |
|
* This function needs to handle everything related to a crash, like cpu |
|
* registers and stack dump, information to help to debug the fatal error, etc. |
|
*/ |
|
static void rproc_crash_handler_work(struct work_struct *work) |
|
{ |
|
struct rproc *rproc = container_of(work, struct rproc, crash_handler); |
|
struct device *dev = &rproc->dev; |
|
|
|
dev_dbg(dev, "enter %s\n", __func__); |
|
|
|
mutex_lock(&rproc->lock); |
|
|
|
if (rproc->state == RPROC_CRASHED || rproc->state == RPROC_OFFLINE) { |
|
/* handle only the first crash detected */ |
|
mutex_unlock(&rproc->lock); |
|
return; |
|
} |
|
|
|
rproc->state = RPROC_CRASHED; |
|
dev_err(dev, "handling crash #%u in %s\n", ++rproc->crash_cnt, |
|
rproc->name); |
|
|
|
mutex_unlock(&rproc->lock); |
|
|
|
if (!rproc->recovery_disabled) |
|
rproc_trigger_recovery(rproc); |
|
|
|
pm_relax(rproc->dev.parent); |
|
} |
|
|
|
/** |
|
* rproc_boot() - boot a remote processor |
|
* @rproc: handle of a remote processor |
|
* |
|
* Boot a remote processor (i.e. load its firmware, power it on, ...). |
|
* |
|
* If the remote processor is already powered on, this function immediately |
|
* returns (successfully). |
|
* |
|
* Return: 0 on success, and an appropriate error value otherwise |
|
*/ |
|
int rproc_boot(struct rproc *rproc) |
|
{ |
|
const struct firmware *firmware_p; |
|
struct device *dev; |
|
int ret; |
|
|
|
if (!rproc) { |
|
pr_err("invalid rproc handle\n"); |
|
return -EINVAL; |
|
} |
|
|
|
dev = &rproc->dev; |
|
|
|
ret = mutex_lock_interruptible(&rproc->lock); |
|
if (ret) { |
|
dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret); |
|
return ret; |
|
} |
|
|
|
if (rproc->state == RPROC_DELETED) { |
|
ret = -ENODEV; |
|
dev_err(dev, "can't boot deleted rproc %s\n", rproc->name); |
|
goto unlock_mutex; |
|
} |
|
|
|
/* skip the boot or attach process if rproc is already powered up */ |
|
if (atomic_inc_return(&rproc->power) > 1) { |
|
ret = 0; |
|
goto unlock_mutex; |
|
} |
|
|
|
if (rproc->state == RPROC_DETACHED) { |
|
dev_info(dev, "attaching to %s\n", rproc->name); |
|
|
|
ret = rproc_attach(rproc); |
|
} else { |
|
dev_info(dev, "powering up %s\n", rproc->name); |
|
|
|
/* load firmware */ |
|
ret = request_firmware(&firmware_p, rproc->firmware, dev); |
|
if (ret < 0) { |
|
dev_err(dev, "request_firmware failed: %d\n", ret); |
|
goto downref_rproc; |
|
} |
|
|
|
ret = rproc_fw_boot(rproc, firmware_p); |
|
|
|
release_firmware(firmware_p); |
|
} |
|
|
|
downref_rproc: |
|
if (ret) |
|
atomic_dec(&rproc->power); |
|
unlock_mutex: |
|
mutex_unlock(&rproc->lock); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(rproc_boot); |
|
|
|
/** |
|
* rproc_shutdown() - power off the remote processor |
|
* @rproc: the remote processor |
|
* |
|
* Power off a remote processor (previously booted with rproc_boot()). |
|
* |
|
* In case @rproc is still being used by an additional user(s), then |
|
* this function will just decrement the power refcount and exit, |
|
* without really powering off the device. |
|
* |
|
* Every call to rproc_boot() must (eventually) be accompanied by a call |
|
* to rproc_shutdown(). Calling rproc_shutdown() redundantly is a bug. |
|
* |
|
* Notes: |
|
* - we're not decrementing the rproc's refcount, only the power refcount. |
|
* which means that the @rproc handle stays valid even after rproc_shutdown() |
|
* returns, and users can still use it with a subsequent rproc_boot(), if |
|
* needed. |
|
*/ |
|
void rproc_shutdown(struct rproc *rproc) |
|
{ |
|
struct device *dev = &rproc->dev; |
|
int ret; |
|
|
|
ret = mutex_lock_interruptible(&rproc->lock); |
|
if (ret) { |
|
dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret); |
|
return; |
|
} |
|
|
|
/* if the remote proc is still needed, bail out */ |
|
if (!atomic_dec_and_test(&rproc->power)) |
|
goto out; |
|
|
|
ret = rproc_stop(rproc, false); |
|
if (ret) { |
|
atomic_inc(&rproc->power); |
|
goto out; |
|
} |
|
|
|
/* clean up all acquired resources */ |
|
rproc_resource_cleanup(rproc); |
|
|
|
/* release HW resources if needed */ |
|
rproc_unprepare_device(rproc); |
|
|
|
rproc_disable_iommu(rproc); |
|
|
|
/* Free the copy of the resource table */ |
|
kfree(rproc->cached_table); |
|
rproc->cached_table = NULL; |
|
rproc->table_ptr = NULL; |
|
out: |
|
mutex_unlock(&rproc->lock); |
|
} |
|
EXPORT_SYMBOL(rproc_shutdown); |
|
|
|
/** |
|
* rproc_detach() - Detach the remote processor from the |
|
* remoteproc core |
|
* |
|
* @rproc: the remote processor |
|
* |
|
* Detach a remote processor (previously attached to with rproc_attach()). |
|
* |
|
* In case @rproc is still being used by an additional user(s), then |
|
* this function will just decrement the power refcount and exit, |
|
* without disconnecting the device. |
|
* |
|
* Function rproc_detach() calls __rproc_detach() in order to let a remote |
|
* processor know that services provided by the application processor are |
|
* no longer available. From there it should be possible to remove the |
|
* platform driver and even power cycle the application processor (if the HW |
|
* supports it) without needing to switch off the remote processor. |
|
* |
|
* Return: 0 on success, and an appropriate error value otherwise |
|
*/ |
|
int rproc_detach(struct rproc *rproc) |
|
{ |
|
struct device *dev = &rproc->dev; |
|
int ret; |
|
|
|
ret = mutex_lock_interruptible(&rproc->lock); |
|
if (ret) { |
|
dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret); |
|
return ret; |
|
} |
|
|
|
/* if the remote proc is still needed, bail out */ |
|
if (!atomic_dec_and_test(&rproc->power)) { |
|
ret = 0; |
|
goto out; |
|
} |
|
|
|
ret = __rproc_detach(rproc); |
|
if (ret) { |
|
atomic_inc(&rproc->power); |
|
goto out; |
|
} |
|
|
|
/* clean up all acquired resources */ |
|
rproc_resource_cleanup(rproc); |
|
|
|
/* release HW resources if needed */ |
|
rproc_unprepare_device(rproc); |
|
|
|
rproc_disable_iommu(rproc); |
|
|
|
/* Free the copy of the resource table */ |
|
kfree(rproc->cached_table); |
|
rproc->cached_table = NULL; |
|
rproc->table_ptr = NULL; |
|
out: |
|
mutex_unlock(&rproc->lock); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(rproc_detach); |
|
|
|
/** |
|
* rproc_get_by_phandle() - find a remote processor by phandle |
|
* @phandle: phandle to the rproc |
|
* |
|
* Finds an rproc handle using the remote processor's phandle, and then |
|
* return a handle to the rproc. |
|
* |
|
* This function increments the remote processor's refcount, so always |
|
* use rproc_put() to decrement it back once rproc isn't needed anymore. |
|
* |
|
* Return: rproc handle on success, and NULL on failure |
|
*/ |
|
#ifdef CONFIG_OF |
|
struct rproc *rproc_get_by_phandle(phandle phandle) |
|
{ |
|
struct rproc *rproc = NULL, *r; |
|
struct device_node *np; |
|
|
|
np = of_find_node_by_phandle(phandle); |
|
if (!np) |
|
return NULL; |
|
|
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(r, &rproc_list, node) { |
|
if (r->dev.parent && r->dev.parent->of_node == np) { |
|
/* prevent underlying implementation from being removed */ |
|
if (!try_module_get(r->dev.parent->driver->owner)) { |
|
dev_err(&r->dev, "can't get owner\n"); |
|
break; |
|
} |
|
|
|
rproc = r; |
|
get_device(&rproc->dev); |
|
break; |
|
} |
|
} |
|
rcu_read_unlock(); |
|
|
|
of_node_put(np); |
|
|
|
return rproc; |
|
} |
|
#else |
|
struct rproc *rproc_get_by_phandle(phandle phandle) |
|
{ |
|
return NULL; |
|
} |
|
#endif |
|
EXPORT_SYMBOL(rproc_get_by_phandle); |
|
|
|
/** |
|
* rproc_set_firmware() - assign a new firmware |
|
* @rproc: rproc handle to which the new firmware is being assigned |
|
* @fw_name: new firmware name to be assigned |
|
* |
|
* This function allows remoteproc drivers or clients to configure a custom |
|
* firmware name that is different from the default name used during remoteproc |
|
* registration. The function does not trigger a remote processor boot, |
|
* only sets the firmware name used for a subsequent boot. This function |
|
* should also be called only when the remote processor is offline. |
|
* |
|
* This allows either the userspace to configure a different name through |
|
* sysfs or a kernel-level remoteproc or a remoteproc client driver to set |
|
* a specific firmware when it is controlling the boot and shutdown of the |
|
* remote processor. |
|
* |
|
* Return: 0 on success or a negative value upon failure |
|
*/ |
|
int rproc_set_firmware(struct rproc *rproc, const char *fw_name) |
|
{ |
|
struct device *dev; |
|
int ret, len; |
|
char *p; |
|
|
|
if (!rproc || !fw_name) |
|
return -EINVAL; |
|
|
|
dev = rproc->dev.parent; |
|
|
|
ret = mutex_lock_interruptible(&rproc->lock); |
|
if (ret) { |
|
dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret); |
|
return -EINVAL; |
|
} |
|
|
|
if (rproc->state != RPROC_OFFLINE) { |
|
dev_err(dev, "can't change firmware while running\n"); |
|
ret = -EBUSY; |
|
goto out; |
|
} |
|
|
|
len = strcspn(fw_name, "\n"); |
|
if (!len) { |
|
dev_err(dev, "can't provide empty string for firmware name\n"); |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
|
|
p = kstrndup(fw_name, len, GFP_KERNEL); |
|
if (!p) { |
|
ret = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
kfree_const(rproc->firmware); |
|
rproc->firmware = p; |
|
|
|
out: |
|
mutex_unlock(&rproc->lock); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(rproc_set_firmware); |
|
|
|
static int rproc_validate(struct rproc *rproc) |
|
{ |
|
switch (rproc->state) { |
|
case RPROC_OFFLINE: |
|
/* |
|
* An offline processor without a start() |
|
* function makes no sense. |
|
*/ |
|
if (!rproc->ops->start) |
|
return -EINVAL; |
|
break; |
|
case RPROC_DETACHED: |
|
/* |
|
* A remote processor in a detached state without an |
|
* attach() function makes not sense. |
|
*/ |
|
if (!rproc->ops->attach) |
|
return -EINVAL; |
|
/* |
|
* When attaching to a remote processor the device memory |
|
* is already available and as such there is no need to have a |
|
* cached table. |
|
*/ |
|
if (rproc->cached_table) |
|
return -EINVAL; |
|
break; |
|
default: |
|
/* |
|
* When adding a remote processor, the state of the device |
|
* can be offline or detached, nothing else. |
|
*/ |
|
return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* rproc_add() - register a remote processor |
|
* @rproc: the remote processor handle to register |
|
* |
|
* Registers @rproc with the remoteproc framework, after it has been |
|
* allocated with rproc_alloc(). |
|
* |
|
* This is called by the platform-specific rproc implementation, whenever |
|
* a new remote processor device is probed. |
|
* |
|
* Note: this function initiates an asynchronous firmware loading |
|
* context, which will look for virtio devices supported by the rproc's |
|
* firmware. |
|
* |
|
* If found, those virtio devices will be created and added, so as a result |
|
* of registering this remote processor, additional virtio drivers might be |
|
* probed. |
|
* |
|
* Return: 0 on success and an appropriate error code otherwise |
|
*/ |
|
int rproc_add(struct rproc *rproc) |
|
{ |
|
struct device *dev = &rproc->dev; |
|
int ret; |
|
|
|
ret = rproc_validate(rproc); |
|
if (ret < 0) |
|
return ret; |
|
|
|
/* add char device for this remoteproc */ |
|
ret = rproc_char_device_add(rproc); |
|
if (ret < 0) |
|
return ret; |
|
|
|
ret = device_add(dev); |
|
if (ret < 0) { |
|
put_device(dev); |
|
goto rproc_remove_cdev; |
|
} |
|
|
|
dev_info(dev, "%s is available\n", rproc->name); |
|
|
|
/* create debugfs entries */ |
|
rproc_create_debug_dir(rproc); |
|
|
|
/* if rproc is marked always-on, request it to boot */ |
|
if (rproc->auto_boot) { |
|
ret = rproc_trigger_auto_boot(rproc); |
|
if (ret < 0) |
|
goto rproc_remove_dev; |
|
} |
|
|
|
/* expose to rproc_get_by_phandle users */ |
|
mutex_lock(&rproc_list_mutex); |
|
list_add_rcu(&rproc->node, &rproc_list); |
|
mutex_unlock(&rproc_list_mutex); |
|
|
|
return 0; |
|
|
|
rproc_remove_dev: |
|
rproc_delete_debug_dir(rproc); |
|
device_del(dev); |
|
rproc_remove_cdev: |
|
rproc_char_device_remove(rproc); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(rproc_add); |
|
|
|
static void devm_rproc_remove(void *rproc) |
|
{ |
|
rproc_del(rproc); |
|
} |
|
|
|
/** |
|
* devm_rproc_add() - resource managed rproc_add() |
|
* @dev: the underlying device |
|
* @rproc: the remote processor handle to register |
|
* |
|
* This function performs like rproc_add() but the registered rproc device will |
|
* automatically be removed on driver detach. |
|
* |
|
* Return: 0 on success, negative errno on failure |
|
*/ |
|
int devm_rproc_add(struct device *dev, struct rproc *rproc) |
|
{ |
|
int err; |
|
|
|
err = rproc_add(rproc); |
|
if (err) |
|
return err; |
|
|
|
return devm_add_action_or_reset(dev, devm_rproc_remove, rproc); |
|
} |
|
EXPORT_SYMBOL(devm_rproc_add); |
|
|
|
/** |
|
* rproc_type_release() - release a remote processor instance |
|
* @dev: the rproc's device |
|
* |
|
* This function should _never_ be called directly. |
|
* |
|
* It will be called by the driver core when no one holds a valid pointer |
|
* to @dev anymore. |
|
*/ |
|
static void rproc_type_release(struct device *dev) |
|
{ |
|
struct rproc *rproc = container_of(dev, struct rproc, dev); |
|
|
|
dev_info(&rproc->dev, "releasing %s\n", rproc->name); |
|
|
|
idr_destroy(&rproc->notifyids); |
|
|
|
if (rproc->index >= 0) |
|
ida_simple_remove(&rproc_dev_index, rproc->index); |
|
|
|
kfree_const(rproc->firmware); |
|
kfree_const(rproc->name); |
|
kfree(rproc->ops); |
|
kfree(rproc); |
|
} |
|
|
|
static const struct device_type rproc_type = { |
|
.name = "remoteproc", |
|
.release = rproc_type_release, |
|
}; |
|
|
|
static int rproc_alloc_firmware(struct rproc *rproc, |
|
const char *name, const char *firmware) |
|
{ |
|
const char *p; |
|
|
|
/* |
|
* Allocate a firmware name if the caller gave us one to work |
|
* with. Otherwise construct a new one using a default pattern. |
|
*/ |
|
if (firmware) |
|
p = kstrdup_const(firmware, GFP_KERNEL); |
|
else |
|
p = kasprintf(GFP_KERNEL, "rproc-%s-fw", name); |
|
|
|
if (!p) |
|
return -ENOMEM; |
|
|
|
rproc->firmware = p; |
|
|
|
return 0; |
|
} |
|
|
|
static int rproc_alloc_ops(struct rproc *rproc, const struct rproc_ops *ops) |
|
{ |
|
rproc->ops = kmemdup(ops, sizeof(*ops), GFP_KERNEL); |
|
if (!rproc->ops) |
|
return -ENOMEM; |
|
|
|
/* Default to rproc_coredump if no coredump function is specified */ |
|
if (!rproc->ops->coredump) |
|
rproc->ops->coredump = rproc_coredump; |
|
|
|
if (rproc->ops->load) |
|
return 0; |
|
|
|
/* Default to ELF loader if no load function is specified */ |
|
rproc->ops->load = rproc_elf_load_segments; |
|
rproc->ops->parse_fw = rproc_elf_load_rsc_table; |
|
rproc->ops->find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table; |
|
rproc->ops->sanity_check = rproc_elf_sanity_check; |
|
rproc->ops->get_boot_addr = rproc_elf_get_boot_addr; |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* rproc_alloc() - allocate a remote processor handle |
|
* @dev: the underlying device |
|
* @name: name of this remote processor |
|
* @ops: platform-specific handlers (mainly start/stop) |
|
* @firmware: name of firmware file to load, can be NULL |
|
* @len: length of private data needed by the rproc driver (in bytes) |
|
* |
|
* Allocates a new remote processor handle, but does not register |
|
* it yet. if @firmware is NULL, a default name is used. |
|
* |
|
* This function should be used by rproc implementations during initialization |
|
* of the remote processor. |
|
* |
|
* After creating an rproc handle using this function, and when ready, |
|
* implementations should then call rproc_add() to complete |
|
* the registration of the remote processor. |
|
* |
|
* Note: _never_ directly deallocate @rproc, even if it was not registered |
|
* yet. Instead, when you need to unroll rproc_alloc(), use rproc_free(). |
|
* |
|
* Return: new rproc pointer on success, and NULL on failure |
|
*/ |
|
struct rproc *rproc_alloc(struct device *dev, const char *name, |
|
const struct rproc_ops *ops, |
|
const char *firmware, int len) |
|
{ |
|
struct rproc *rproc; |
|
|
|
if (!dev || !name || !ops) |
|
return NULL; |
|
|
|
rproc = kzalloc(sizeof(struct rproc) + len, GFP_KERNEL); |
|
if (!rproc) |
|
return NULL; |
|
|
|
rproc->priv = &rproc[1]; |
|
rproc->auto_boot = true; |
|
rproc->elf_class = ELFCLASSNONE; |
|
rproc->elf_machine = EM_NONE; |
|
|
|
device_initialize(&rproc->dev); |
|
rproc->dev.parent = dev; |
|
rproc->dev.type = &rproc_type; |
|
rproc->dev.class = &rproc_class; |
|
rproc->dev.driver_data = rproc; |
|
idr_init(&rproc->notifyids); |
|
|
|
rproc->name = kstrdup_const(name, GFP_KERNEL); |
|
if (!rproc->name) |
|
goto put_device; |
|
|
|
if (rproc_alloc_firmware(rproc, name, firmware)) |
|
goto put_device; |
|
|
|
if (rproc_alloc_ops(rproc, ops)) |
|
goto put_device; |
|
|
|
/* Assign a unique device index and name */ |
|
rproc->index = ida_simple_get(&rproc_dev_index, 0, 0, GFP_KERNEL); |
|
if (rproc->index < 0) { |
|
dev_err(dev, "ida_simple_get failed: %d\n", rproc->index); |
|
goto put_device; |
|
} |
|
|
|
dev_set_name(&rproc->dev, "remoteproc%d", rproc->index); |
|
|
|
atomic_set(&rproc->power, 0); |
|
|
|
mutex_init(&rproc->lock); |
|
|
|
INIT_LIST_HEAD(&rproc->carveouts); |
|
INIT_LIST_HEAD(&rproc->mappings); |
|
INIT_LIST_HEAD(&rproc->traces); |
|
INIT_LIST_HEAD(&rproc->rvdevs); |
|
INIT_LIST_HEAD(&rproc->subdevs); |
|
INIT_LIST_HEAD(&rproc->dump_segments); |
|
|
|
INIT_WORK(&rproc->crash_handler, rproc_crash_handler_work); |
|
|
|
rproc->state = RPROC_OFFLINE; |
|
|
|
return rproc; |
|
|
|
put_device: |
|
put_device(&rproc->dev); |
|
return NULL; |
|
} |
|
EXPORT_SYMBOL(rproc_alloc); |
|
|
|
/** |
|
* rproc_free() - unroll rproc_alloc() |
|
* @rproc: the remote processor handle |
|
* |
|
* This function decrements the rproc dev refcount. |
|
* |
|
* If no one holds any reference to rproc anymore, then its refcount would |
|
* now drop to zero, and it would be freed. |
|
*/ |
|
void rproc_free(struct rproc *rproc) |
|
{ |
|
put_device(&rproc->dev); |
|
} |
|
EXPORT_SYMBOL(rproc_free); |
|
|
|
/** |
|
* rproc_put() - release rproc reference |
|
* @rproc: the remote processor handle |
|
* |
|
* This function decrements the rproc dev refcount. |
|
* |
|
* If no one holds any reference to rproc anymore, then its refcount would |
|
* now drop to zero, and it would be freed. |
|
*/ |
|
void rproc_put(struct rproc *rproc) |
|
{ |
|
module_put(rproc->dev.parent->driver->owner); |
|
put_device(&rproc->dev); |
|
} |
|
EXPORT_SYMBOL(rproc_put); |
|
|
|
/** |
|
* rproc_del() - unregister a remote processor |
|
* @rproc: rproc handle to unregister |
|
* |
|
* This function should be called when the platform specific rproc |
|
* implementation decides to remove the rproc device. it should |
|
* _only_ be called if a previous invocation of rproc_add() |
|
* has completed successfully. |
|
* |
|
* After rproc_del() returns, @rproc isn't freed yet, because |
|
* of the outstanding reference created by rproc_alloc. To decrement that |
|
* one last refcount, one still needs to call rproc_free(). |
|
* |
|
* Return: 0 on success and -EINVAL if @rproc isn't valid |
|
*/ |
|
int rproc_del(struct rproc *rproc) |
|
{ |
|
if (!rproc) |
|
return -EINVAL; |
|
|
|
/* TODO: make sure this works with rproc->power > 1 */ |
|
rproc_shutdown(rproc); |
|
|
|
mutex_lock(&rproc->lock); |
|
rproc->state = RPROC_DELETED; |
|
mutex_unlock(&rproc->lock); |
|
|
|
rproc_delete_debug_dir(rproc); |
|
|
|
/* the rproc is downref'ed as soon as it's removed from the klist */ |
|
mutex_lock(&rproc_list_mutex); |
|
list_del_rcu(&rproc->node); |
|
mutex_unlock(&rproc_list_mutex); |
|
|
|
/* Ensure that no readers of rproc_list are still active */ |
|
synchronize_rcu(); |
|
|
|
device_del(&rproc->dev); |
|
rproc_char_device_remove(rproc); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(rproc_del); |
|
|
|
static void devm_rproc_free(struct device *dev, void *res) |
|
{ |
|
rproc_free(*(struct rproc **)res); |
|
} |
|
|
|
/** |
|
* devm_rproc_alloc() - resource managed rproc_alloc() |
|
* @dev: the underlying device |
|
* @name: name of this remote processor |
|
* @ops: platform-specific handlers (mainly start/stop) |
|
* @firmware: name of firmware file to load, can be NULL |
|
* @len: length of private data needed by the rproc driver (in bytes) |
|
* |
|
* This function performs like rproc_alloc() but the acquired rproc device will |
|
* automatically be released on driver detach. |
|
* |
|
* Return: new rproc instance, or NULL on failure |
|
*/ |
|
struct rproc *devm_rproc_alloc(struct device *dev, const char *name, |
|
const struct rproc_ops *ops, |
|
const char *firmware, int len) |
|
{ |
|
struct rproc **ptr, *rproc; |
|
|
|
ptr = devres_alloc(devm_rproc_free, sizeof(*ptr), GFP_KERNEL); |
|
if (!ptr) |
|
return NULL; |
|
|
|
rproc = rproc_alloc(dev, name, ops, firmware, len); |
|
if (rproc) { |
|
*ptr = rproc; |
|
devres_add(dev, ptr); |
|
} else { |
|
devres_free(ptr); |
|
} |
|
|
|
return rproc; |
|
} |
|
EXPORT_SYMBOL(devm_rproc_alloc); |
|
|
|
/** |
|
* rproc_add_subdev() - add a subdevice to a remoteproc |
|
* @rproc: rproc handle to add the subdevice to |
|
* @subdev: subdev handle to register |
|
* |
|
* Caller is responsible for populating optional subdevice function pointers. |
|
*/ |
|
void rproc_add_subdev(struct rproc *rproc, struct rproc_subdev *subdev) |
|
{ |
|
list_add_tail(&subdev->node, &rproc->subdevs); |
|
} |
|
EXPORT_SYMBOL(rproc_add_subdev); |
|
|
|
/** |
|
* rproc_remove_subdev() - remove a subdevice from a remoteproc |
|
* @rproc: rproc handle to remove the subdevice from |
|
* @subdev: subdev handle, previously registered with rproc_add_subdev() |
|
*/ |
|
void rproc_remove_subdev(struct rproc *rproc, struct rproc_subdev *subdev) |
|
{ |
|
list_del(&subdev->node); |
|
} |
|
EXPORT_SYMBOL(rproc_remove_subdev); |
|
|
|
/** |
|
* rproc_get_by_child() - acquire rproc handle of @dev's ancestor |
|
* @dev: child device to find ancestor of |
|
* |
|
* Return: the ancestor rproc instance, or NULL if not found |
|
*/ |
|
struct rproc *rproc_get_by_child(struct device *dev) |
|
{ |
|
for (dev = dev->parent; dev; dev = dev->parent) { |
|
if (dev->type == &rproc_type) |
|
return dev->driver_data; |
|
} |
|
|
|
return NULL; |
|
} |
|
EXPORT_SYMBOL(rproc_get_by_child); |
|
|
|
/** |
|
* rproc_report_crash() - rproc crash reporter function |
|
* @rproc: remote processor |
|
* @type: crash type |
|
* |
|
* This function must be called every time a crash is detected by the low-level |
|
* drivers implementing a specific remoteproc. This should not be called from a |
|
* non-remoteproc driver. |
|
* |
|
* This function can be called from atomic/interrupt context. |
|
*/ |
|
void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type) |
|
{ |
|
if (!rproc) { |
|
pr_err("NULL rproc pointer\n"); |
|
return; |
|
} |
|
|
|
/* Prevent suspend while the remoteproc is being recovered */ |
|
pm_stay_awake(rproc->dev.parent); |
|
|
|
dev_err(&rproc->dev, "crash detected in %s: type %s\n", |
|
rproc->name, rproc_crash_to_string(type)); |
|
|
|
/* Have a worker handle the error; ensure system is not suspended */ |
|
queue_work(system_freezable_wq, &rproc->crash_handler); |
|
} |
|
EXPORT_SYMBOL(rproc_report_crash); |
|
|
|
static int rproc_panic_handler(struct notifier_block *nb, unsigned long event, |
|
void *ptr) |
|
{ |
|
unsigned int longest = 0; |
|
struct rproc *rproc; |
|
unsigned int d; |
|
|
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(rproc, &rproc_list, node) { |
|
if (!rproc->ops->panic) |
|
continue; |
|
|
|
if (rproc->state != RPROC_RUNNING && |
|
rproc->state != RPROC_ATTACHED) |
|
continue; |
|
|
|
d = rproc->ops->panic(rproc); |
|
longest = max(longest, d); |
|
} |
|
rcu_read_unlock(); |
|
|
|
/* |
|
* Delay for the longest requested duration before returning. This can |
|
* be used by the remoteproc drivers to give the remote processor time |
|
* to perform any requested operations (such as flush caches), when |
|
* it's not possible to signal the Linux side due to the panic. |
|
*/ |
|
mdelay(longest); |
|
|
|
return NOTIFY_DONE; |
|
} |
|
|
|
static void __init rproc_init_panic(void) |
|
{ |
|
rproc_panic_nb.notifier_call = rproc_panic_handler; |
|
atomic_notifier_chain_register(&panic_notifier_list, &rproc_panic_nb); |
|
} |
|
|
|
static void __exit rproc_exit_panic(void) |
|
{ |
|
atomic_notifier_chain_unregister(&panic_notifier_list, &rproc_panic_nb); |
|
} |
|
|
|
static int __init remoteproc_init(void) |
|
{ |
|
rproc_init_sysfs(); |
|
rproc_init_debugfs(); |
|
rproc_init_cdev(); |
|
rproc_init_panic(); |
|
|
|
return 0; |
|
} |
|
subsys_initcall(remoteproc_init); |
|
|
|
static void __exit remoteproc_exit(void) |
|
{ |
|
ida_destroy(&rproc_dev_index); |
|
|
|
rproc_exit_panic(); |
|
rproc_exit_debugfs(); |
|
rproc_exit_sysfs(); |
|
} |
|
module_exit(remoteproc_exit); |
|
|
|
MODULE_LICENSE("GPL v2"); |
|
MODULE_DESCRIPTION("Generic Remote Processor Framework");
|
|
|