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732 lines
17 KiB
732 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2013 - Virtual Open Systems |
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* Author: Antonios Motakis <[email protected]> |
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*/ |
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|
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#define dev_fmt(fmt) "VFIO: " fmt |
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|
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#include <linux/device.h> |
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#include <linux/acpi.h> |
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#include <linux/iommu.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> |
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#include <linux/uaccess.h> |
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#include <linux/vfio.h> |
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#include "vfio_platform_private.h" |
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#define DRIVER_VERSION "0.10" |
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#define DRIVER_AUTHOR "Antonios Motakis <[email protected]>" |
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#define DRIVER_DESC "VFIO platform base module" |
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#define VFIO_PLATFORM_IS_ACPI(vdev) ((vdev)->acpihid != NULL) |
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static LIST_HEAD(reset_list); |
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static DEFINE_MUTEX(driver_lock); |
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static vfio_platform_reset_fn_t vfio_platform_lookup_reset(const char *compat, |
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struct module **module) |
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{ |
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struct vfio_platform_reset_node *iter; |
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vfio_platform_reset_fn_t reset_fn = NULL; |
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mutex_lock(&driver_lock); |
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list_for_each_entry(iter, &reset_list, link) { |
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if (!strcmp(iter->compat, compat) && |
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try_module_get(iter->owner)) { |
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*module = iter->owner; |
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reset_fn = iter->of_reset; |
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break; |
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} |
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} |
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mutex_unlock(&driver_lock); |
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return reset_fn; |
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} |
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static int vfio_platform_acpi_probe(struct vfio_platform_device *vdev, |
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struct device *dev) |
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{ |
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struct acpi_device *adev; |
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if (acpi_disabled) |
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return -ENOENT; |
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adev = ACPI_COMPANION(dev); |
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if (!adev) { |
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dev_err(dev, "ACPI companion device not found for %s\n", |
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vdev->name); |
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return -ENODEV; |
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} |
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#ifdef CONFIG_ACPI |
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vdev->acpihid = acpi_device_hid(adev); |
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#endif |
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return WARN_ON(!vdev->acpihid) ? -EINVAL : 0; |
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} |
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static int vfio_platform_acpi_call_reset(struct vfio_platform_device *vdev, |
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const char **extra_dbg) |
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{ |
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#ifdef CONFIG_ACPI |
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
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struct device *dev = vdev->device; |
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acpi_handle handle = ACPI_HANDLE(dev); |
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acpi_status acpi_ret; |
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acpi_ret = acpi_evaluate_object(handle, "_RST", NULL, &buffer); |
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if (ACPI_FAILURE(acpi_ret)) { |
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if (extra_dbg) |
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*extra_dbg = acpi_format_exception(acpi_ret); |
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return -EINVAL; |
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} |
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return 0; |
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#else |
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return -ENOENT; |
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#endif |
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} |
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static bool vfio_platform_acpi_has_reset(struct vfio_platform_device *vdev) |
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{ |
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#ifdef CONFIG_ACPI |
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struct device *dev = vdev->device; |
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acpi_handle handle = ACPI_HANDLE(dev); |
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return acpi_has_method(handle, "_RST"); |
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#else |
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return false; |
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#endif |
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} |
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static bool vfio_platform_has_reset(struct vfio_platform_device *vdev) |
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{ |
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if (VFIO_PLATFORM_IS_ACPI(vdev)) |
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return vfio_platform_acpi_has_reset(vdev); |
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return vdev->of_reset ? true : false; |
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} |
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static int vfio_platform_get_reset(struct vfio_platform_device *vdev) |
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{ |
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if (VFIO_PLATFORM_IS_ACPI(vdev)) |
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return vfio_platform_acpi_has_reset(vdev) ? 0 : -ENOENT; |
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vdev->of_reset = vfio_platform_lookup_reset(vdev->compat, |
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&vdev->reset_module); |
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if (!vdev->of_reset) { |
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request_module("vfio-reset:%s", vdev->compat); |
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vdev->of_reset = vfio_platform_lookup_reset(vdev->compat, |
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&vdev->reset_module); |
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} |
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return vdev->of_reset ? 0 : -ENOENT; |
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} |
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static void vfio_platform_put_reset(struct vfio_platform_device *vdev) |
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{ |
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if (VFIO_PLATFORM_IS_ACPI(vdev)) |
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return; |
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if (vdev->of_reset) |
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module_put(vdev->reset_module); |
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} |
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static int vfio_platform_regions_init(struct vfio_platform_device *vdev) |
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{ |
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int cnt = 0, i; |
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while (vdev->get_resource(vdev, cnt)) |
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cnt++; |
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vdev->regions = kcalloc(cnt, sizeof(struct vfio_platform_region), |
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GFP_KERNEL); |
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if (!vdev->regions) |
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return -ENOMEM; |
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for (i = 0; i < cnt; i++) { |
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struct resource *res = |
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vdev->get_resource(vdev, i); |
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if (!res) |
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goto err; |
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vdev->regions[i].addr = res->start; |
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vdev->regions[i].size = resource_size(res); |
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vdev->regions[i].flags = 0; |
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switch (resource_type(res)) { |
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case IORESOURCE_MEM: |
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vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_MMIO; |
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vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ; |
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if (!(res->flags & IORESOURCE_READONLY)) |
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vdev->regions[i].flags |= |
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VFIO_REGION_INFO_FLAG_WRITE; |
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/* |
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* Only regions addressed with PAGE granularity may be |
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* MMAPed securely. |
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*/ |
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if (!(vdev->regions[i].addr & ~PAGE_MASK) && |
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!(vdev->regions[i].size & ~PAGE_MASK)) |
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vdev->regions[i].flags |= |
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VFIO_REGION_INFO_FLAG_MMAP; |
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break; |
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case IORESOURCE_IO: |
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vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_PIO; |
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break; |
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default: |
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goto err; |
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} |
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} |
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vdev->num_regions = cnt; |
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return 0; |
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err: |
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kfree(vdev->regions); |
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return -EINVAL; |
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} |
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static void vfio_platform_regions_cleanup(struct vfio_platform_device *vdev) |
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{ |
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int i; |
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for (i = 0; i < vdev->num_regions; i++) |
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iounmap(vdev->regions[i].ioaddr); |
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vdev->num_regions = 0; |
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kfree(vdev->regions); |
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} |
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static int vfio_platform_call_reset(struct vfio_platform_device *vdev, |
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const char **extra_dbg) |
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{ |
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if (VFIO_PLATFORM_IS_ACPI(vdev)) { |
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dev_info(vdev->device, "reset\n"); |
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return vfio_platform_acpi_call_reset(vdev, extra_dbg); |
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} else if (vdev->of_reset) { |
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dev_info(vdev->device, "reset\n"); |
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return vdev->of_reset(vdev); |
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} |
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dev_warn(vdev->device, "no reset function found!\n"); |
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return -EINVAL; |
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} |
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static void vfio_platform_close_device(struct vfio_device *core_vdev) |
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{ |
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struct vfio_platform_device *vdev = |
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container_of(core_vdev, struct vfio_platform_device, vdev); |
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const char *extra_dbg = NULL; |
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int ret; |
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ret = vfio_platform_call_reset(vdev, &extra_dbg); |
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if (WARN_ON(ret && vdev->reset_required)) { |
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dev_warn( |
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vdev->device, |
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"reset driver is required and reset call failed in release (%d) %s\n", |
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ret, extra_dbg ? extra_dbg : ""); |
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} |
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pm_runtime_put(vdev->device); |
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vfio_platform_regions_cleanup(vdev); |
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vfio_platform_irq_cleanup(vdev); |
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} |
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static int vfio_platform_open_device(struct vfio_device *core_vdev) |
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{ |
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struct vfio_platform_device *vdev = |
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container_of(core_vdev, struct vfio_platform_device, vdev); |
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const char *extra_dbg = NULL; |
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int ret; |
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ret = vfio_platform_regions_init(vdev); |
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if (ret) |
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return ret; |
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ret = vfio_platform_irq_init(vdev); |
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if (ret) |
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goto err_irq; |
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ret = pm_runtime_get_sync(vdev->device); |
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if (ret < 0) |
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goto err_rst; |
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ret = vfio_platform_call_reset(vdev, &extra_dbg); |
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if (ret && vdev->reset_required) { |
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dev_warn( |
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vdev->device, |
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"reset driver is required and reset call failed in open (%d) %s\n", |
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ret, extra_dbg ? extra_dbg : ""); |
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goto err_rst; |
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} |
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return 0; |
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err_rst: |
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pm_runtime_put(vdev->device); |
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vfio_platform_irq_cleanup(vdev); |
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err_irq: |
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vfio_platform_regions_cleanup(vdev); |
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return ret; |
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} |
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static long vfio_platform_ioctl(struct vfio_device *core_vdev, |
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unsigned int cmd, unsigned long arg) |
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{ |
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struct vfio_platform_device *vdev = |
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container_of(core_vdev, struct vfio_platform_device, vdev); |
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unsigned long minsz; |
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if (cmd == VFIO_DEVICE_GET_INFO) { |
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struct vfio_device_info info; |
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minsz = offsetofend(struct vfio_device_info, num_irqs); |
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if (copy_from_user(&info, (void __user *)arg, minsz)) |
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return -EFAULT; |
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if (info.argsz < minsz) |
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return -EINVAL; |
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if (vfio_platform_has_reset(vdev)) |
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vdev->flags |= VFIO_DEVICE_FLAGS_RESET; |
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info.flags = vdev->flags; |
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info.num_regions = vdev->num_regions; |
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info.num_irqs = vdev->num_irqs; |
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return copy_to_user((void __user *)arg, &info, minsz) ? |
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-EFAULT : 0; |
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} else if (cmd == VFIO_DEVICE_GET_REGION_INFO) { |
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struct vfio_region_info info; |
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minsz = offsetofend(struct vfio_region_info, offset); |
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if (copy_from_user(&info, (void __user *)arg, minsz)) |
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return -EFAULT; |
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if (info.argsz < minsz) |
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return -EINVAL; |
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if (info.index >= vdev->num_regions) |
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return -EINVAL; |
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/* map offset to the physical address */ |
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info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index); |
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info.size = vdev->regions[info.index].size; |
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info.flags = vdev->regions[info.index].flags; |
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return copy_to_user((void __user *)arg, &info, minsz) ? |
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-EFAULT : 0; |
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} else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) { |
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struct vfio_irq_info info; |
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minsz = offsetofend(struct vfio_irq_info, count); |
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if (copy_from_user(&info, (void __user *)arg, minsz)) |
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return -EFAULT; |
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if (info.argsz < minsz) |
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return -EINVAL; |
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if (info.index >= vdev->num_irqs) |
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return -EINVAL; |
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info.flags = vdev->irqs[info.index].flags; |
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info.count = vdev->irqs[info.index].count; |
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return copy_to_user((void __user *)arg, &info, minsz) ? |
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-EFAULT : 0; |
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} else if (cmd == VFIO_DEVICE_SET_IRQS) { |
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struct vfio_irq_set hdr; |
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u8 *data = NULL; |
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int ret = 0; |
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size_t data_size = 0; |
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minsz = offsetofend(struct vfio_irq_set, count); |
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if (copy_from_user(&hdr, (void __user *)arg, minsz)) |
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return -EFAULT; |
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ret = vfio_set_irqs_validate_and_prepare(&hdr, vdev->num_irqs, |
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vdev->num_irqs, &data_size); |
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if (ret) |
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return ret; |
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if (data_size) { |
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data = memdup_user((void __user *)(arg + minsz), |
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data_size); |
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
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} |
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mutex_lock(&vdev->igate); |
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ret = vfio_platform_set_irqs_ioctl(vdev, hdr.flags, hdr.index, |
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hdr.start, hdr.count, data); |
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mutex_unlock(&vdev->igate); |
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kfree(data); |
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return ret; |
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} else if (cmd == VFIO_DEVICE_RESET) { |
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return vfio_platform_call_reset(vdev, NULL); |
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} |
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return -ENOTTY; |
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} |
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static ssize_t vfio_platform_read_mmio(struct vfio_platform_region *reg, |
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char __user *buf, size_t count, |
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loff_t off) |
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{ |
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unsigned int done = 0; |
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if (!reg->ioaddr) { |
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reg->ioaddr = |
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ioremap(reg->addr, reg->size); |
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if (!reg->ioaddr) |
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return -ENOMEM; |
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} |
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while (count) { |
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size_t filled; |
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if (count >= 4 && !(off % 4)) { |
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u32 val; |
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val = ioread32(reg->ioaddr + off); |
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if (copy_to_user(buf, &val, 4)) |
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goto err; |
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filled = 4; |
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} else if (count >= 2 && !(off % 2)) { |
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u16 val; |
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val = ioread16(reg->ioaddr + off); |
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if (copy_to_user(buf, &val, 2)) |
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goto err; |
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filled = 2; |
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} else { |
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u8 val; |
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val = ioread8(reg->ioaddr + off); |
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if (copy_to_user(buf, &val, 1)) |
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goto err; |
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filled = 1; |
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} |
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count -= filled; |
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done += filled; |
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off += filled; |
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buf += filled; |
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} |
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return done; |
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err: |
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return -EFAULT; |
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} |
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static ssize_t vfio_platform_read(struct vfio_device *core_vdev, |
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char __user *buf, size_t count, loff_t *ppos) |
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{ |
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struct vfio_platform_device *vdev = |
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container_of(core_vdev, struct vfio_platform_device, vdev); |
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unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos); |
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loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK; |
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if (index >= vdev->num_regions) |
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return -EINVAL; |
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if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)) |
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return -EINVAL; |
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if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) |
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return vfio_platform_read_mmio(&vdev->regions[index], |
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buf, count, off); |
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else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) |
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return -EINVAL; /* not implemented */ |
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return -EINVAL; |
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} |
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static ssize_t vfio_platform_write_mmio(struct vfio_platform_region *reg, |
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const char __user *buf, size_t count, |
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loff_t off) |
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{ |
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unsigned int done = 0; |
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if (!reg->ioaddr) { |
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reg->ioaddr = |
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ioremap(reg->addr, reg->size); |
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if (!reg->ioaddr) |
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return -ENOMEM; |
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} |
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while (count) { |
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size_t filled; |
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if (count >= 4 && !(off % 4)) { |
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u32 val; |
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if (copy_from_user(&val, buf, 4)) |
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goto err; |
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iowrite32(val, reg->ioaddr + off); |
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filled = 4; |
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} else if (count >= 2 && !(off % 2)) { |
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u16 val; |
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if (copy_from_user(&val, buf, 2)) |
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goto err; |
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iowrite16(val, reg->ioaddr + off); |
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filled = 2; |
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} else { |
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u8 val; |
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if (copy_from_user(&val, buf, 1)) |
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goto err; |
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iowrite8(val, reg->ioaddr + off); |
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filled = 1; |
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} |
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count -= filled; |
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done += filled; |
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off += filled; |
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buf += filled; |
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} |
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return done; |
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err: |
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return -EFAULT; |
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} |
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static ssize_t vfio_platform_write(struct vfio_device *core_vdev, const char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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struct vfio_platform_device *vdev = |
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container_of(core_vdev, struct vfio_platform_device, vdev); |
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unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos); |
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loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK; |
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if (index >= vdev->num_regions) |
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return -EINVAL; |
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if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)) |
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return -EINVAL; |
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if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) |
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return vfio_platform_write_mmio(&vdev->regions[index], |
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buf, count, off); |
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else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) |
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return -EINVAL; /* not implemented */ |
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return -EINVAL; |
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} |
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static int vfio_platform_mmap_mmio(struct vfio_platform_region region, |
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struct vm_area_struct *vma) |
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{ |
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u64 req_len, pgoff, req_start; |
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req_len = vma->vm_end - vma->vm_start; |
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pgoff = vma->vm_pgoff & |
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((1U << (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT)) - 1); |
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req_start = pgoff << PAGE_SHIFT; |
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if (region.size < PAGE_SIZE || req_start + req_len > region.size) |
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return -EINVAL; |
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vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
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vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff; |
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return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, |
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req_len, vma->vm_page_prot); |
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} |
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static int vfio_platform_mmap(struct vfio_device *core_vdev, struct vm_area_struct *vma) |
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{ |
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struct vfio_platform_device *vdev = |
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container_of(core_vdev, struct vfio_platform_device, vdev); |
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unsigned int index; |
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index = vma->vm_pgoff >> (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT); |
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if (vma->vm_end < vma->vm_start) |
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return -EINVAL; |
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if (!(vma->vm_flags & VM_SHARED)) |
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return -EINVAL; |
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if (index >= vdev->num_regions) |
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return -EINVAL; |
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if (vma->vm_start & ~PAGE_MASK) |
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return -EINVAL; |
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if (vma->vm_end & ~PAGE_MASK) |
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return -EINVAL; |
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|
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if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP)) |
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return -EINVAL; |
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|
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if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ) |
|
&& (vma->vm_flags & VM_READ)) |
|
return -EINVAL; |
|
|
|
if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE) |
|
&& (vma->vm_flags & VM_WRITE)) |
|
return -EINVAL; |
|
|
|
vma->vm_private_data = vdev; |
|
|
|
if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) |
|
return vfio_platform_mmap_mmio(vdev->regions[index], vma); |
|
|
|
else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) |
|
return -EINVAL; /* not implemented */ |
|
|
|
return -EINVAL; |
|
} |
|
|
|
static const struct vfio_device_ops vfio_platform_ops = { |
|
.name = "vfio-platform", |
|
.open_device = vfio_platform_open_device, |
|
.close_device = vfio_platform_close_device, |
|
.ioctl = vfio_platform_ioctl, |
|
.read = vfio_platform_read, |
|
.write = vfio_platform_write, |
|
.mmap = vfio_platform_mmap, |
|
}; |
|
|
|
static int vfio_platform_of_probe(struct vfio_platform_device *vdev, |
|
struct device *dev) |
|
{ |
|
int ret; |
|
|
|
ret = device_property_read_string(dev, "compatible", |
|
&vdev->compat); |
|
if (ret) |
|
dev_err(dev, "Cannot retrieve compat for %s\n", vdev->name); |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* There can be two kernel build combinations. One build where |
|
* ACPI is not selected in Kconfig and another one with the ACPI Kconfig. |
|
* |
|
* In the first case, vfio_platform_acpi_probe will return since |
|
* acpi_disabled is 1. DT user will not see any kind of messages from |
|
* ACPI. |
|
* |
|
* In the second case, both DT and ACPI is compiled in but the system is |
|
* booting with any of these combinations. |
|
* |
|
* If the firmware is DT type, then acpi_disabled is 1. The ACPI probe routine |
|
* terminates immediately without any messages. |
|
* |
|
* If the firmware is ACPI type, then acpi_disabled is 0. All other checks are |
|
* valid checks. We cannot claim that this system is DT. |
|
*/ |
|
int vfio_platform_probe_common(struct vfio_platform_device *vdev, |
|
struct device *dev) |
|
{ |
|
struct iommu_group *group; |
|
int ret; |
|
|
|
vfio_init_group_dev(&vdev->vdev, dev, &vfio_platform_ops); |
|
|
|
ret = vfio_platform_acpi_probe(vdev, dev); |
|
if (ret) |
|
ret = vfio_platform_of_probe(vdev, dev); |
|
|
|
if (ret) |
|
goto out_uninit; |
|
|
|
vdev->device = dev; |
|
|
|
ret = vfio_platform_get_reset(vdev); |
|
if (ret && vdev->reset_required) { |
|
dev_err(dev, "No reset function found for device %s\n", |
|
vdev->name); |
|
goto out_uninit; |
|
} |
|
|
|
group = vfio_iommu_group_get(dev); |
|
if (!group) { |
|
dev_err(dev, "No IOMMU group for device %s\n", vdev->name); |
|
ret = -EINVAL; |
|
goto put_reset; |
|
} |
|
|
|
ret = vfio_register_group_dev(&vdev->vdev); |
|
if (ret) |
|
goto put_iommu; |
|
|
|
mutex_init(&vdev->igate); |
|
|
|
pm_runtime_enable(dev); |
|
return 0; |
|
|
|
put_iommu: |
|
vfio_iommu_group_put(group, dev); |
|
put_reset: |
|
vfio_platform_put_reset(vdev); |
|
out_uninit: |
|
vfio_uninit_group_dev(&vdev->vdev); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(vfio_platform_probe_common); |
|
|
|
void vfio_platform_remove_common(struct vfio_platform_device *vdev) |
|
{ |
|
vfio_unregister_group_dev(&vdev->vdev); |
|
|
|
pm_runtime_disable(vdev->device); |
|
vfio_platform_put_reset(vdev); |
|
vfio_uninit_group_dev(&vdev->vdev); |
|
vfio_iommu_group_put(vdev->vdev.dev->iommu_group, vdev->vdev.dev); |
|
} |
|
EXPORT_SYMBOL_GPL(vfio_platform_remove_common); |
|
|
|
void __vfio_platform_register_reset(struct vfio_platform_reset_node *node) |
|
{ |
|
mutex_lock(&driver_lock); |
|
list_add(&node->link, &reset_list); |
|
mutex_unlock(&driver_lock); |
|
} |
|
EXPORT_SYMBOL_GPL(__vfio_platform_register_reset); |
|
|
|
void vfio_platform_unregister_reset(const char *compat, |
|
vfio_platform_reset_fn_t fn) |
|
{ |
|
struct vfio_platform_reset_node *iter, *temp; |
|
|
|
mutex_lock(&driver_lock); |
|
list_for_each_entry_safe(iter, temp, &reset_list, link) { |
|
if (!strcmp(iter->compat, compat) && (iter->of_reset == fn)) { |
|
list_del(&iter->link); |
|
break; |
|
} |
|
} |
|
|
|
mutex_unlock(&driver_lock); |
|
|
|
} |
|
EXPORT_SYMBOL_GPL(vfio_platform_unregister_reset); |
|
|
|
MODULE_VERSION(DRIVER_VERSION); |
|
MODULE_LICENSE("GPL v2"); |
|
MODULE_AUTHOR(DRIVER_AUTHOR); |
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
|