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807 lines
20 KiB
807 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Virtio memory mapped device driver |
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* |
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* Copyright 2011-2014, ARM Ltd. |
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* |
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* This module allows virtio devices to be used over a virtual, memory mapped |
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* platform device. |
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* |
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* The guest device(s) may be instantiated in one of three equivalent ways: |
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* |
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* 1. Static platform device in board's code, eg.: |
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* |
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* static struct platform_device v2m_virtio_device = { |
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* .name = "virtio-mmio", |
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* .id = -1, |
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* .num_resources = 2, |
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* .resource = (struct resource []) { |
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* { |
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* .start = 0x1001e000, |
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* .end = 0x1001e0ff, |
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* .flags = IORESOURCE_MEM, |
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* }, { |
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* .start = 42 + 32, |
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* .end = 42 + 32, |
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* .flags = IORESOURCE_IRQ, |
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* }, |
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* } |
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* }; |
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* |
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* 2. Device Tree node, eg.: |
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* |
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* virtio_block@1e000 { |
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* compatible = "virtio,mmio"; |
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* reg = <0x1e000 0x100>; |
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* interrupts = <42>; |
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* } |
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* |
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* 3. Kernel module (or command line) parameter. Can be used more than once - |
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* one device will be created for each one. Syntax: |
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* |
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* [virtio_mmio.]device=<size>@<baseaddr>:<irq>[:<id>] |
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* where: |
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* <size> := size (can use standard suffixes like K, M or G) |
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* <baseaddr> := physical base address |
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* <irq> := interrupt number (as passed to request_irq()) |
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* <id> := (optional) platform device id |
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* eg.: |
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* virtio_mmio.device=0x100@0x100b0000:48 \ |
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* virtio_mmio.device=1K@0x1001e000:74 |
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* |
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* Based on Virtio PCI driver by Anthony Liguori, copyright IBM Corp. 2007 |
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*/ |
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#define pr_fmt(fmt) "virtio-mmio: " fmt |
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#include <linux/acpi.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/highmem.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/list.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include <linux/virtio.h> |
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#include <linux/virtio_config.h> |
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#include <uapi/linux/virtio_mmio.h> |
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#include <linux/virtio_ring.h> |
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/* The alignment to use between consumer and producer parts of vring. |
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* Currently hardcoded to the page size. */ |
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#define VIRTIO_MMIO_VRING_ALIGN PAGE_SIZE |
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#define to_virtio_mmio_device(_plat_dev) \ |
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container_of(_plat_dev, struct virtio_mmio_device, vdev) |
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struct virtio_mmio_device { |
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struct virtio_device vdev; |
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struct platform_device *pdev; |
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void __iomem *base; |
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unsigned long version; |
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|
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/* a list of queues so we can dispatch IRQs */ |
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spinlock_t lock; |
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struct list_head virtqueues; |
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}; |
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struct virtio_mmio_vq_info { |
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/* the actual virtqueue */ |
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struct virtqueue *vq; |
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/* the list node for the virtqueues list */ |
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struct list_head node; |
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}; |
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/* Configuration interface */ |
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static u64 vm_get_features(struct virtio_device *vdev) |
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{ |
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struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
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u64 features; |
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writel(1, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL); |
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features = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES); |
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features <<= 32; |
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writel(0, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL); |
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features |= readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES); |
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return features; |
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} |
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static int vm_finalize_features(struct virtio_device *vdev) |
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{ |
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struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
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/* Give virtio_ring a chance to accept features. */ |
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vring_transport_features(vdev); |
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/* Make sure there are no mixed devices */ |
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if (vm_dev->version == 2 && |
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!__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { |
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dev_err(&vdev->dev, "New virtio-mmio devices (version 2) must provide VIRTIO_F_VERSION_1 feature!\n"); |
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return -EINVAL; |
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} |
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writel(1, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL); |
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writel((u32)(vdev->features >> 32), |
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vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES); |
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writel(0, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL); |
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writel((u32)vdev->features, |
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vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES); |
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return 0; |
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} |
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static void vm_get(struct virtio_device *vdev, unsigned offset, |
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void *buf, unsigned len) |
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{ |
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struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
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void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG; |
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u8 b; |
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__le16 w; |
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__le32 l; |
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if (vm_dev->version == 1) { |
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u8 *ptr = buf; |
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int i; |
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for (i = 0; i < len; i++) |
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ptr[i] = readb(base + offset + i); |
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return; |
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} |
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switch (len) { |
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case 1: |
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b = readb(base + offset); |
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memcpy(buf, &b, sizeof b); |
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break; |
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case 2: |
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w = cpu_to_le16(readw(base + offset)); |
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memcpy(buf, &w, sizeof w); |
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break; |
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case 4: |
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l = cpu_to_le32(readl(base + offset)); |
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memcpy(buf, &l, sizeof l); |
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break; |
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case 8: |
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l = cpu_to_le32(readl(base + offset)); |
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memcpy(buf, &l, sizeof l); |
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l = cpu_to_le32(ioread32(base + offset + sizeof l)); |
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memcpy(buf + sizeof l, &l, sizeof l); |
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break; |
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default: |
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BUG(); |
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} |
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} |
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static void vm_set(struct virtio_device *vdev, unsigned offset, |
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const void *buf, unsigned len) |
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{ |
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struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
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void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG; |
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u8 b; |
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__le16 w; |
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__le32 l; |
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if (vm_dev->version == 1) { |
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const u8 *ptr = buf; |
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int i; |
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for (i = 0; i < len; i++) |
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writeb(ptr[i], base + offset + i); |
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return; |
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} |
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switch (len) { |
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case 1: |
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memcpy(&b, buf, sizeof b); |
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writeb(b, base + offset); |
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break; |
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case 2: |
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memcpy(&w, buf, sizeof w); |
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writew(le16_to_cpu(w), base + offset); |
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break; |
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case 4: |
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memcpy(&l, buf, sizeof l); |
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writel(le32_to_cpu(l), base + offset); |
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break; |
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case 8: |
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memcpy(&l, buf, sizeof l); |
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writel(le32_to_cpu(l), base + offset); |
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memcpy(&l, buf + sizeof l, sizeof l); |
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writel(le32_to_cpu(l), base + offset + sizeof l); |
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break; |
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default: |
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BUG(); |
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} |
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} |
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static u32 vm_generation(struct virtio_device *vdev) |
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{ |
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struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
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if (vm_dev->version == 1) |
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return 0; |
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else |
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return readl(vm_dev->base + VIRTIO_MMIO_CONFIG_GENERATION); |
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} |
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static u8 vm_get_status(struct virtio_device *vdev) |
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{ |
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struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
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return readl(vm_dev->base + VIRTIO_MMIO_STATUS) & 0xff; |
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} |
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static void vm_set_status(struct virtio_device *vdev, u8 status) |
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{ |
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struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
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/* We should never be setting status to 0. */ |
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BUG_ON(status == 0); |
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writel(status, vm_dev->base + VIRTIO_MMIO_STATUS); |
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} |
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static void vm_reset(struct virtio_device *vdev) |
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{ |
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struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
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/* 0 status means a reset. */ |
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writel(0, vm_dev->base + VIRTIO_MMIO_STATUS); |
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} |
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/* Transport interface */ |
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/* the notify function used when creating a virt queue */ |
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static bool vm_notify(struct virtqueue *vq) |
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{ |
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struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); |
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/* We write the queue's selector into the notification register to |
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* signal the other end */ |
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writel(vq->index, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY); |
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return true; |
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} |
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/* Notify all virtqueues on an interrupt. */ |
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static irqreturn_t vm_interrupt(int irq, void *opaque) |
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{ |
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struct virtio_mmio_device *vm_dev = opaque; |
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struct virtio_mmio_vq_info *info; |
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unsigned long status; |
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unsigned long flags; |
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irqreturn_t ret = IRQ_NONE; |
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/* Read and acknowledge interrupts */ |
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status = readl(vm_dev->base + VIRTIO_MMIO_INTERRUPT_STATUS); |
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writel(status, vm_dev->base + VIRTIO_MMIO_INTERRUPT_ACK); |
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if (unlikely(status & VIRTIO_MMIO_INT_CONFIG)) { |
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virtio_config_changed(&vm_dev->vdev); |
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ret = IRQ_HANDLED; |
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} |
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if (likely(status & VIRTIO_MMIO_INT_VRING)) { |
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spin_lock_irqsave(&vm_dev->lock, flags); |
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list_for_each_entry(info, &vm_dev->virtqueues, node) |
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ret |= vring_interrupt(irq, info->vq); |
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spin_unlock_irqrestore(&vm_dev->lock, flags); |
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} |
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return ret; |
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} |
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static void vm_del_vq(struct virtqueue *vq) |
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{ |
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struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); |
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struct virtio_mmio_vq_info *info = vq->priv; |
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unsigned long flags; |
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unsigned int index = vq->index; |
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spin_lock_irqsave(&vm_dev->lock, flags); |
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list_del(&info->node); |
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spin_unlock_irqrestore(&vm_dev->lock, flags); |
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/* Select and deactivate the queue */ |
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writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); |
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if (vm_dev->version == 1) { |
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writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); |
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} else { |
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writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); |
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WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY)); |
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} |
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vring_del_virtqueue(vq); |
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kfree(info); |
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} |
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static void vm_del_vqs(struct virtio_device *vdev) |
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{ |
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struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
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struct virtqueue *vq, *n; |
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list_for_each_entry_safe(vq, n, &vdev->vqs, list) |
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vm_del_vq(vq); |
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free_irq(platform_get_irq(vm_dev->pdev, 0), vm_dev); |
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} |
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static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index, |
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void (*callback)(struct virtqueue *vq), |
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const char *name, bool ctx) |
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{ |
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struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
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struct virtio_mmio_vq_info *info; |
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struct virtqueue *vq; |
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unsigned long flags; |
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unsigned int num; |
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int err; |
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if (!name) |
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return NULL; |
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/* Select the queue we're interested in */ |
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writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); |
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/* Queue shouldn't already be set up. */ |
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if (readl(vm_dev->base + (vm_dev->version == 1 ? |
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VIRTIO_MMIO_QUEUE_PFN : VIRTIO_MMIO_QUEUE_READY))) { |
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err = -ENOENT; |
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goto error_available; |
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} |
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/* Allocate and fill out our active queue description */ |
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info = kmalloc(sizeof(*info), GFP_KERNEL); |
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if (!info) { |
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err = -ENOMEM; |
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goto error_kmalloc; |
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} |
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num = readl(vm_dev->base + VIRTIO_MMIO_QUEUE_NUM_MAX); |
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if (num == 0) { |
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err = -ENOENT; |
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goto error_new_virtqueue; |
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} |
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/* Create the vring */ |
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vq = vring_create_virtqueue(index, num, VIRTIO_MMIO_VRING_ALIGN, vdev, |
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true, true, ctx, vm_notify, callback, name); |
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if (!vq) { |
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err = -ENOMEM; |
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goto error_new_virtqueue; |
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} |
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/* Activate the queue */ |
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writel(virtqueue_get_vring_size(vq), vm_dev->base + VIRTIO_MMIO_QUEUE_NUM); |
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if (vm_dev->version == 1) { |
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u64 q_pfn = virtqueue_get_desc_addr(vq) >> PAGE_SHIFT; |
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/* |
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* virtio-mmio v1 uses a 32bit QUEUE PFN. If we have something |
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* that doesn't fit in 32bit, fail the setup rather than |
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* pretending to be successful. |
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*/ |
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if (q_pfn >> 32) { |
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dev_err(&vdev->dev, |
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"platform bug: legacy virtio-mmio must not be used with RAM above 0x%llxGB\n", |
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0x1ULL << (32 + PAGE_SHIFT - 30)); |
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err = -E2BIG; |
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goto error_bad_pfn; |
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} |
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writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_QUEUE_ALIGN); |
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writel(q_pfn, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); |
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} else { |
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u64 addr; |
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addr = virtqueue_get_desc_addr(vq); |
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writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_LOW); |
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writel((u32)(addr >> 32), |
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vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_HIGH); |
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addr = virtqueue_get_avail_addr(vq); |
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writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_LOW); |
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writel((u32)(addr >> 32), |
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vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_HIGH); |
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addr = virtqueue_get_used_addr(vq); |
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writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_USED_LOW); |
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writel((u32)(addr >> 32), |
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vm_dev->base + VIRTIO_MMIO_QUEUE_USED_HIGH); |
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writel(1, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); |
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} |
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vq->priv = info; |
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info->vq = vq; |
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spin_lock_irqsave(&vm_dev->lock, flags); |
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list_add(&info->node, &vm_dev->virtqueues); |
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spin_unlock_irqrestore(&vm_dev->lock, flags); |
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return vq; |
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error_bad_pfn: |
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vring_del_virtqueue(vq); |
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error_new_virtqueue: |
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if (vm_dev->version == 1) { |
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writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); |
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} else { |
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writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); |
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WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY)); |
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} |
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kfree(info); |
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error_kmalloc: |
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error_available: |
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return ERR_PTR(err); |
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} |
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static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs, |
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struct virtqueue *vqs[], |
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vq_callback_t *callbacks[], |
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const char * const names[], |
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const bool *ctx, |
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struct irq_affinity *desc) |
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{ |
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struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
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int irq = platform_get_irq(vm_dev->pdev, 0); |
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int i, err, queue_idx = 0; |
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if (irq < 0) |
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return irq; |
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err = request_irq(irq, vm_interrupt, IRQF_SHARED, |
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dev_name(&vdev->dev), vm_dev); |
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if (err) |
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return err; |
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for (i = 0; i < nvqs; ++i) { |
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if (!names[i]) { |
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vqs[i] = NULL; |
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continue; |
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} |
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vqs[i] = vm_setup_vq(vdev, queue_idx++, callbacks[i], names[i], |
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ctx ? ctx[i] : false); |
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if (IS_ERR(vqs[i])) { |
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vm_del_vqs(vdev); |
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return PTR_ERR(vqs[i]); |
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} |
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} |
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return 0; |
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} |
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static const char *vm_bus_name(struct virtio_device *vdev) |
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{ |
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struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
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return vm_dev->pdev->name; |
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} |
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static bool vm_get_shm_region(struct virtio_device *vdev, |
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struct virtio_shm_region *region, u8 id) |
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{ |
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struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
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u64 len, addr; |
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/* Select the region we're interested in */ |
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writel(id, vm_dev->base + VIRTIO_MMIO_SHM_SEL); |
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/* Read the region size */ |
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len = (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_LEN_LOW); |
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len |= (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_LEN_HIGH) << 32; |
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region->len = len; |
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/* Check if region length is -1. If that's the case, the shared memory |
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* region does not exist and there is no need to proceed further. |
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*/ |
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if (len == ~(u64)0) |
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return false; |
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/* Read the region base address */ |
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addr = (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_BASE_LOW); |
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addr |= (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_BASE_HIGH) << 32; |
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region->addr = addr; |
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return true; |
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} |
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static const struct virtio_config_ops virtio_mmio_config_ops = { |
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.get = vm_get, |
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.set = vm_set, |
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.generation = vm_generation, |
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.get_status = vm_get_status, |
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.set_status = vm_set_status, |
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.reset = vm_reset, |
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.find_vqs = vm_find_vqs, |
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.del_vqs = vm_del_vqs, |
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.get_features = vm_get_features, |
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.finalize_features = vm_finalize_features, |
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.bus_name = vm_bus_name, |
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.get_shm_region = vm_get_shm_region, |
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}; |
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static void virtio_mmio_release_dev(struct device *_d) |
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{ |
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struct virtio_device *vdev = |
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container_of(_d, struct virtio_device, dev); |
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struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
|
struct platform_device *pdev = vm_dev->pdev; |
|
|
|
devm_kfree(&pdev->dev, vm_dev); |
|
} |
|
|
|
/* Platform device */ |
|
|
|
static int virtio_mmio_probe(struct platform_device *pdev) |
|
{ |
|
struct virtio_mmio_device *vm_dev; |
|
unsigned long magic; |
|
int rc; |
|
|
|
vm_dev = devm_kzalloc(&pdev->dev, sizeof(*vm_dev), GFP_KERNEL); |
|
if (!vm_dev) |
|
return -ENOMEM; |
|
|
|
vm_dev->vdev.dev.parent = &pdev->dev; |
|
vm_dev->vdev.dev.release = virtio_mmio_release_dev; |
|
vm_dev->vdev.config = &virtio_mmio_config_ops; |
|
vm_dev->pdev = pdev; |
|
INIT_LIST_HEAD(&vm_dev->virtqueues); |
|
spin_lock_init(&vm_dev->lock); |
|
|
|
vm_dev->base = devm_platform_ioremap_resource(pdev, 0); |
|
if (IS_ERR(vm_dev->base)) |
|
return PTR_ERR(vm_dev->base); |
|
|
|
/* Check magic value */ |
|
magic = readl(vm_dev->base + VIRTIO_MMIO_MAGIC_VALUE); |
|
if (magic != ('v' | 'i' << 8 | 'r' << 16 | 't' << 24)) { |
|
dev_warn(&pdev->dev, "Wrong magic value 0x%08lx!\n", magic); |
|
return -ENODEV; |
|
} |
|
|
|
/* Check device version */ |
|
vm_dev->version = readl(vm_dev->base + VIRTIO_MMIO_VERSION); |
|
if (vm_dev->version < 1 || vm_dev->version > 2) { |
|
dev_err(&pdev->dev, "Version %ld not supported!\n", |
|
vm_dev->version); |
|
return -ENXIO; |
|
} |
|
|
|
vm_dev->vdev.id.device = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_ID); |
|
if (vm_dev->vdev.id.device == 0) { |
|
/* |
|
* virtio-mmio device with an ID 0 is a (dummy) placeholder |
|
* with no function. End probing now with no error reported. |
|
*/ |
|
return -ENODEV; |
|
} |
|
vm_dev->vdev.id.vendor = readl(vm_dev->base + VIRTIO_MMIO_VENDOR_ID); |
|
|
|
if (vm_dev->version == 1) { |
|
writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_GUEST_PAGE_SIZE); |
|
|
|
rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)); |
|
/* |
|
* In the legacy case, ensure our coherently-allocated virtio |
|
* ring will be at an address expressable as a 32-bit PFN. |
|
*/ |
|
if (!rc) |
|
dma_set_coherent_mask(&pdev->dev, |
|
DMA_BIT_MASK(32 + PAGE_SHIFT)); |
|
} else { |
|
rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); |
|
} |
|
if (rc) |
|
rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); |
|
if (rc) |
|
dev_warn(&pdev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n"); |
|
|
|
platform_set_drvdata(pdev, vm_dev); |
|
|
|
rc = register_virtio_device(&vm_dev->vdev); |
|
if (rc) |
|
put_device(&vm_dev->vdev.dev); |
|
|
|
return rc; |
|
} |
|
|
|
static int virtio_mmio_remove(struct platform_device *pdev) |
|
{ |
|
struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev); |
|
unregister_virtio_device(&vm_dev->vdev); |
|
|
|
return 0; |
|
} |
|
|
|
|
|
|
|
/* Devices list parameter */ |
|
|
|
#if defined(CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES) |
|
|
|
static struct device vm_cmdline_parent = { |
|
.init_name = "virtio-mmio-cmdline", |
|
}; |
|
|
|
static int vm_cmdline_parent_registered; |
|
static int vm_cmdline_id; |
|
|
|
static int vm_cmdline_set(const char *device, |
|
const struct kernel_param *kp) |
|
{ |
|
int err; |
|
struct resource resources[2] = {}; |
|
char *str; |
|
long long int base, size; |
|
unsigned int irq; |
|
int processed, consumed = 0; |
|
struct platform_device *pdev; |
|
|
|
/* Consume "size" part of the command line parameter */ |
|
size = memparse(device, &str); |
|
|
|
/* Get "@<base>:<irq>[:<id>]" chunks */ |
|
processed = sscanf(str, "@%lli:%u%n:%d%n", |
|
&base, &irq, &consumed, |
|
&vm_cmdline_id, &consumed); |
|
|
|
/* |
|
* sscanf() must process at least 2 chunks; also there |
|
* must be no extra characters after the last chunk, so |
|
* str[consumed] must be '\0' |
|
*/ |
|
if (processed < 2 || str[consumed] || irq == 0) |
|
return -EINVAL; |
|
|
|
resources[0].flags = IORESOURCE_MEM; |
|
resources[0].start = base; |
|
resources[0].end = base + size - 1; |
|
|
|
resources[1].flags = IORESOURCE_IRQ; |
|
resources[1].start = resources[1].end = irq; |
|
|
|
if (!vm_cmdline_parent_registered) { |
|
err = device_register(&vm_cmdline_parent); |
|
if (err) { |
|
pr_err("Failed to register parent device!\n"); |
|
return err; |
|
} |
|
vm_cmdline_parent_registered = 1; |
|
} |
|
|
|
pr_info("Registering device virtio-mmio.%d at 0x%llx-0x%llx, IRQ %d.\n", |
|
vm_cmdline_id, |
|
(unsigned long long)resources[0].start, |
|
(unsigned long long)resources[0].end, |
|
(int)resources[1].start); |
|
|
|
pdev = platform_device_register_resndata(&vm_cmdline_parent, |
|
"virtio-mmio", vm_cmdline_id++, |
|
resources, ARRAY_SIZE(resources), NULL, 0); |
|
|
|
return PTR_ERR_OR_ZERO(pdev); |
|
} |
|
|
|
static int vm_cmdline_get_device(struct device *dev, void *data) |
|
{ |
|
char *buffer = data; |
|
unsigned int len = strlen(buffer); |
|
struct platform_device *pdev = to_platform_device(dev); |
|
|
|
snprintf(buffer + len, PAGE_SIZE - len, "0x%llx@0x%llx:%llu:%d\n", |
|
pdev->resource[0].end - pdev->resource[0].start + 1ULL, |
|
(unsigned long long)pdev->resource[0].start, |
|
(unsigned long long)pdev->resource[1].start, |
|
pdev->id); |
|
return 0; |
|
} |
|
|
|
static int vm_cmdline_get(char *buffer, const struct kernel_param *kp) |
|
{ |
|
buffer[0] = '\0'; |
|
device_for_each_child(&vm_cmdline_parent, buffer, |
|
vm_cmdline_get_device); |
|
return strlen(buffer) + 1; |
|
} |
|
|
|
static const struct kernel_param_ops vm_cmdline_param_ops = { |
|
.set = vm_cmdline_set, |
|
.get = vm_cmdline_get, |
|
}; |
|
|
|
device_param_cb(device, &vm_cmdline_param_ops, NULL, S_IRUSR); |
|
|
|
static int vm_unregister_cmdline_device(struct device *dev, |
|
void *data) |
|
{ |
|
platform_device_unregister(to_platform_device(dev)); |
|
|
|
return 0; |
|
} |
|
|
|
static void vm_unregister_cmdline_devices(void) |
|
{ |
|
if (vm_cmdline_parent_registered) { |
|
device_for_each_child(&vm_cmdline_parent, NULL, |
|
vm_unregister_cmdline_device); |
|
device_unregister(&vm_cmdline_parent); |
|
vm_cmdline_parent_registered = 0; |
|
} |
|
} |
|
|
|
#else |
|
|
|
static void vm_unregister_cmdline_devices(void) |
|
{ |
|
} |
|
|
|
#endif |
|
|
|
/* Platform driver */ |
|
|
|
static const struct of_device_id virtio_mmio_match[] = { |
|
{ .compatible = "virtio,mmio", }, |
|
{}, |
|
}; |
|
MODULE_DEVICE_TABLE(of, virtio_mmio_match); |
|
|
|
#ifdef CONFIG_ACPI |
|
static const struct acpi_device_id virtio_mmio_acpi_match[] = { |
|
{ "LNRO0005", }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(acpi, virtio_mmio_acpi_match); |
|
#endif |
|
|
|
static struct platform_driver virtio_mmio_driver = { |
|
.probe = virtio_mmio_probe, |
|
.remove = virtio_mmio_remove, |
|
.driver = { |
|
.name = "virtio-mmio", |
|
.of_match_table = virtio_mmio_match, |
|
.acpi_match_table = ACPI_PTR(virtio_mmio_acpi_match), |
|
}, |
|
}; |
|
|
|
static int __init virtio_mmio_init(void) |
|
{ |
|
return platform_driver_register(&virtio_mmio_driver); |
|
} |
|
|
|
static void __exit virtio_mmio_exit(void) |
|
{ |
|
platform_driver_unregister(&virtio_mmio_driver); |
|
vm_unregister_cmdline_devices(); |
|
} |
|
|
|
module_init(virtio_mmio_init); |
|
module_exit(virtio_mmio_exit); |
|
|
|
MODULE_AUTHOR("Pawel Moll <[email protected]>"); |
|
MODULE_DESCRIPTION("Platform bus driver for memory mapped virtio devices"); |
|
MODULE_LICENSE("GPL");
|
|
|