^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Virtio memory mapped device driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright 2011-2014, ARM Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * This module allows virtio devices to be used over a virtual, memory mapped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * platform device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * The guest device(s) may be instantiated in one of three equivalent ways:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * 1. Static platform device in board's code, eg.:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * static struct platform_device v2m_virtio_device = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * .name = "virtio-mmio",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * .id = -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * .num_resources = 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * .resource = (struct resource []) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * .start = 0x1001e000,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * .end = 0x1001e0ff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * .flags = IORESOURCE_MEM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * }, {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * .start = 42 + 32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * .end = 42 + 32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * .flags = IORESOURCE_IRQ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * 2. Device Tree node, eg.:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * virtio_block@1e000 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * compatible = "virtio,mmio";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * reg = <0x1e000 0x100>;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * interrupts = <42>;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * 3. Kernel module (or command line) parameter. Can be used more than once -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * one device will be created for each one. Syntax:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * [virtio_mmio.]device=<size>@<baseaddr>:<irq>[:<id>]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * where:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * <size> := size (can use standard suffixes like K, M or G)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * <baseaddr> := physical base address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * <irq> := interrupt number (as passed to request_irq())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * <id> := (optional) platform device id
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * eg.:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * virtio_mmio.device=0x100@0x100b0000:48 \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * virtio_mmio.device=1K@0x1001e000:74
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * Based on Virtio PCI driver by Anthony Liguori, copyright IBM Corp. 2007
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #define pr_fmt(fmt) "virtio-mmio: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #include <linux/dma-mapping.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #include <linux/virtio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #include <linux/virtio_config.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #include <uapi/linux/virtio_mmio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) #include <linux/virtio_ring.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /* The alignment to use between consumer and producer parts of vring.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * Currently hardcoded to the page size. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) #define VIRTIO_MMIO_VRING_ALIGN PAGE_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) #define to_virtio_mmio_device(_plat_dev) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) container_of(_plat_dev, struct virtio_mmio_device, vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct virtio_mmio_device {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) struct virtio_device vdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct platform_device *pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) unsigned long version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) /* a list of queues so we can dispatch IRQs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) struct list_head virtqueues;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct virtio_mmio_vq_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) /* the actual virtqueue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) struct virtqueue *vq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /* the list node for the virtqueues list */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) struct list_head node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /* Configuration interface */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static u64 vm_get_features(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) u64 features;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) writel(1, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) features = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) features <<= 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) writel(0, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) features |= readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return features;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) static int vm_finalize_features(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) /* Give virtio_ring a chance to accept features. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) vring_transport_features(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) /* Make sure there is are no mixed devices */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (vm_dev->version == 2 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) dev_err(&vdev->dev, "New virtio-mmio devices (version 2) must provide VIRTIO_F_VERSION_1 feature!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) writel(1, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) writel((u32)(vdev->features >> 32),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) writel(0, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) writel((u32)vdev->features,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static void vm_get(struct virtio_device *vdev, unsigned offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) void *buf, unsigned len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) u8 b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) __le16 w;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) __le32 l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (vm_dev->version == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) u8 *ptr = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) for (i = 0; i < len; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) ptr[i] = readb(base + offset + i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) switch (len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) b = readb(base + offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) memcpy(buf, &b, sizeof b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) w = cpu_to_le16(readw(base + offset));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) memcpy(buf, &w, sizeof w);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) case 4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) l = cpu_to_le32(readl(base + offset));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) memcpy(buf, &l, sizeof l);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) case 8:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) l = cpu_to_le32(readl(base + offset));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) memcpy(buf, &l, sizeof l);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) l = cpu_to_le32(ioread32(base + offset + sizeof l));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) memcpy(buf + sizeof l, &l, sizeof l);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) static void vm_set(struct virtio_device *vdev, unsigned offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) const void *buf, unsigned len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) u8 b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) __le16 w;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) __le32 l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (vm_dev->version == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) const u8 *ptr = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) for (i = 0; i < len; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) writeb(ptr[i], base + offset + i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) switch (len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) memcpy(&b, buf, sizeof b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) writeb(b, base + offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) memcpy(&w, buf, sizeof w);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) writew(le16_to_cpu(w), base + offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) case 4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) memcpy(&l, buf, sizeof l);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) writel(le32_to_cpu(l), base + offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) case 8:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) memcpy(&l, buf, sizeof l);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) writel(le32_to_cpu(l), base + offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) memcpy(&l, buf + sizeof l, sizeof l);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) writel(le32_to_cpu(l), base + offset + sizeof l);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static u32 vm_generation(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (vm_dev->version == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) return readl(vm_dev->base + VIRTIO_MMIO_CONFIG_GENERATION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) static u8 vm_get_status(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) return readl(vm_dev->base + VIRTIO_MMIO_STATUS) & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) static void vm_set_status(struct virtio_device *vdev, u8 status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) /* We should never be setting status to 0. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) BUG_ON(status == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) writel(status, vm_dev->base + VIRTIO_MMIO_STATUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) static void vm_reset(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) /* 0 status means a reset. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) writel(0, vm_dev->base + VIRTIO_MMIO_STATUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) /* Transport interface */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) /* the notify function used when creating a virt queue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) static bool vm_notify(struct virtqueue *vq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) /* We write the queue's selector into the notification register to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) * signal the other end */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) writel(vq->index, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) /* Notify all virtqueues on an interrupt. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) static irqreturn_t vm_interrupt(int irq, void *opaque)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) struct virtio_mmio_device *vm_dev = opaque;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) struct virtio_mmio_vq_info *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) unsigned long status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) irqreturn_t ret = IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) /* Read and acknowledge interrupts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) status = readl(vm_dev->base + VIRTIO_MMIO_INTERRUPT_STATUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) writel(status, vm_dev->base + VIRTIO_MMIO_INTERRUPT_ACK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) if (unlikely(status & VIRTIO_MMIO_INT_CONFIG)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) virtio_config_changed(&vm_dev->vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) ret = IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) if (likely(status & VIRTIO_MMIO_INT_VRING)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) spin_lock_irqsave(&vm_dev->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) list_for_each_entry(info, &vm_dev->virtqueues, node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) ret |= vring_interrupt(irq, info->vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) spin_unlock_irqrestore(&vm_dev->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) static void vm_del_vq(struct virtqueue *vq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) struct virtio_mmio_vq_info *info = vq->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) unsigned int index = vq->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) spin_lock_irqsave(&vm_dev->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) list_del(&info->node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) spin_unlock_irqrestore(&vm_dev->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) /* Select and deactivate the queue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) if (vm_dev->version == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) vring_del_virtqueue(vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) kfree(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) static void vm_del_vqs(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) struct virtqueue *vq, *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) list_for_each_entry_safe(vq, n, &vdev->vqs, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) vm_del_vq(vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) free_irq(platform_get_irq(vm_dev->pdev, 0), vm_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) void (*callback)(struct virtqueue *vq),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) const char *name, bool ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) struct virtio_mmio_vq_info *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) struct virtqueue *vq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) unsigned int num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) if (!name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) /* Select the queue we're interested in */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) /* Queue shouldn't already be set up. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) if (readl(vm_dev->base + (vm_dev->version == 1 ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) VIRTIO_MMIO_QUEUE_PFN : VIRTIO_MMIO_QUEUE_READY))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) err = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) goto error_available;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) /* Allocate and fill out our active queue description */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) info = kmalloc(sizeof(*info), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) if (!info) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) goto error_kmalloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) num = readl(vm_dev->base + VIRTIO_MMIO_QUEUE_NUM_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) if (num == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) err = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) goto error_new_virtqueue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) /* Create the vring */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) vq = vring_create_virtqueue(index, num, VIRTIO_MMIO_VRING_ALIGN, vdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) true, true, ctx, vm_notify, callback, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) if (!vq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) goto error_new_virtqueue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) /* Activate the queue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) writel(virtqueue_get_vring_size(vq), vm_dev->base + VIRTIO_MMIO_QUEUE_NUM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) if (vm_dev->version == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) u64 q_pfn = virtqueue_get_desc_addr(vq) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) * virtio-mmio v1 uses a 32bit QUEUE PFN. If we have something
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) * that doesn't fit in 32bit, fail the setup rather than
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) * pretending to be successful.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) if (q_pfn >> 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) dev_err(&vdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) "platform bug: legacy virtio-mmio must not be used with RAM above 0x%llxGB\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 0x1ULL << (32 + PAGE_SHIFT - 30));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) err = -E2BIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) goto error_bad_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_QUEUE_ALIGN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) writel(q_pfn, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) u64 addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) addr = virtqueue_get_desc_addr(vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) writel((u32)(addr >> 32),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_HIGH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) addr = virtqueue_get_avail_addr(vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) writel((u32)(addr >> 32),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_HIGH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) addr = virtqueue_get_used_addr(vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_USED_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) writel((u32)(addr >> 32),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) vm_dev->base + VIRTIO_MMIO_QUEUE_USED_HIGH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) writel(1, vm_dev->base + VIRTIO_MMIO_QUEUE_READY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) vq->priv = info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) info->vq = vq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) spin_lock_irqsave(&vm_dev->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) list_add(&info->node, &vm_dev->virtqueues);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) spin_unlock_irqrestore(&vm_dev->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) return vq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) error_bad_pfn:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) vring_del_virtqueue(vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) error_new_virtqueue:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) if (vm_dev->version == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) kfree(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) error_kmalloc:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) error_available:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) struct virtqueue *vqs[],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) vq_callback_t *callbacks[],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) const char * const names[],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) const bool *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) struct irq_affinity *desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) int irq = platform_get_irq(vm_dev->pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) int i, err, queue_idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) if (irq < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) return irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) err = request_irq(irq, vm_interrupt, IRQF_SHARED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) dev_name(&vdev->dev), vm_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) for (i = 0; i < nvqs; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) if (!names[i]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) vqs[i] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) vqs[i] = vm_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) ctx ? ctx[i] : false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) if (IS_ERR(vqs[i])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) vm_del_vqs(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) return PTR_ERR(vqs[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) static const char *vm_bus_name(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) return vm_dev->pdev->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) static bool vm_get_shm_region(struct virtio_device *vdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) struct virtio_shm_region *region, u8 id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) u64 len, addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) /* Select the region we're interested in */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) writel(id, vm_dev->base + VIRTIO_MMIO_SHM_SEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) /* Read the region size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) len = (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_LEN_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) len |= (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_LEN_HIGH) << 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) region->len = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) /* Check if region length is -1. If that's the case, the shared memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) * region does not exist and there is no need to proceed further.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) if (len == ~(u64)0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) /* Read the region base address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) addr = (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_BASE_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) addr |= (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_BASE_HIGH) << 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) region->addr = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) static const struct virtio_config_ops virtio_mmio_config_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) .get = vm_get,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) .set = vm_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) .generation = vm_generation,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) .get_status = vm_get_status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) .set_status = vm_set_status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) .reset = vm_reset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) .find_vqs = vm_find_vqs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) .del_vqs = vm_del_vqs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) .get_features = vm_get_features,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) .finalize_features = vm_finalize_features,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) .bus_name = vm_bus_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) .get_shm_region = vm_get_shm_region,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) static void virtio_mmio_release_dev(struct device *_d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) struct virtio_device *vdev =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) container_of(_d, struct virtio_device, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) struct virtio_mmio_device *vm_dev =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) container_of(vdev, struct virtio_mmio_device, vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) struct platform_device *pdev = vm_dev->pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) devm_kfree(&pdev->dev, vm_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) /* Platform device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) static int virtio_mmio_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) struct virtio_mmio_device *vm_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) unsigned long magic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) vm_dev = devm_kzalloc(&pdev->dev, sizeof(*vm_dev), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) if (!vm_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) vm_dev->vdev.dev.parent = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) vm_dev->vdev.dev.release = virtio_mmio_release_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) vm_dev->vdev.config = &virtio_mmio_config_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) vm_dev->pdev = pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) INIT_LIST_HEAD(&vm_dev->virtqueues);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) spin_lock_init(&vm_dev->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) vm_dev->base = devm_platform_ioremap_resource(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) if (IS_ERR(vm_dev->base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) return PTR_ERR(vm_dev->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) /* Check magic value */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) magic = readl(vm_dev->base + VIRTIO_MMIO_MAGIC_VALUE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) if (magic != ('v' | 'i' << 8 | 'r' << 16 | 't' << 24)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) dev_warn(&pdev->dev, "Wrong magic value 0x%08lx!\n", magic);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) /* Check device version */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) vm_dev->version = readl(vm_dev->base + VIRTIO_MMIO_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) if (vm_dev->version < 1 || vm_dev->version > 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) dev_err(&pdev->dev, "Version %ld not supported!\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) vm_dev->version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) vm_dev->vdev.id.device = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_ID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) if (vm_dev->vdev.id.device == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) * virtio-mmio device with an ID 0 is a (dummy) placeholder
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) * with no function. End probing now with no error reported.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) vm_dev->vdev.id.vendor = readl(vm_dev->base + VIRTIO_MMIO_VENDOR_ID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) if (vm_dev->version == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_GUEST_PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) * In the legacy case, ensure our coherently-allocated virtio
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) * ring will be at an address expressable as a 32-bit PFN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) if (!rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) dma_set_coherent_mask(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) DMA_BIT_MASK(32 + PAGE_SHIFT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) dev_warn(&pdev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) platform_set_drvdata(pdev, vm_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) rc = register_virtio_device(&vm_dev->vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) put_device(&vm_dev->vdev.dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) static int virtio_mmio_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) unregister_virtio_device(&vm_dev->vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) /* Devices list parameter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) #if defined(CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) static struct device vm_cmdline_parent = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) .init_name = "virtio-mmio-cmdline",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) static int vm_cmdline_parent_registered;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) static int vm_cmdline_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) static int vm_cmdline_set(const char *device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) const struct kernel_param *kp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) struct resource resources[2] = {};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) char *str;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) long long int base, size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) unsigned int irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) int processed, consumed = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) struct platform_device *pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) /* Consume "size" part of the command line parameter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) size = memparse(device, &str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) /* Get "@<base>:<irq>[:<id>]" chunks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) processed = sscanf(str, "@%lli:%u%n:%d%n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) &base, &irq, &consumed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) &vm_cmdline_id, &consumed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) * sscanf() must process at least 2 chunks; also there
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) * must be no extra characters after the last chunk, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) * str[consumed] must be '\0'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) if (processed < 2 || str[consumed] || irq == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) resources[0].flags = IORESOURCE_MEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) resources[0].start = base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) resources[0].end = base + size - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) resources[1].flags = IORESOURCE_IRQ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) resources[1].start = resources[1].end = irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) if (!vm_cmdline_parent_registered) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) err = device_register(&vm_cmdline_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) pr_err("Failed to register parent device!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) vm_cmdline_parent_registered = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) pr_info("Registering device virtio-mmio.%d at 0x%llx-0x%llx, IRQ %d.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) vm_cmdline_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) (unsigned long long)resources[0].start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) (unsigned long long)resources[0].end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) (int)resources[1].start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) pdev = platform_device_register_resndata(&vm_cmdline_parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) "virtio-mmio", vm_cmdline_id++,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) resources, ARRAY_SIZE(resources), NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) return PTR_ERR_OR_ZERO(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) static int vm_cmdline_get_device(struct device *dev, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) char *buffer = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) unsigned int len = strlen(buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) struct platform_device *pdev = to_platform_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) snprintf(buffer + len, PAGE_SIZE - len, "0x%llx@0x%llx:%llu:%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) pdev->resource[0].end - pdev->resource[0].start + 1ULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) (unsigned long long)pdev->resource[0].start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) (unsigned long long)pdev->resource[1].start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) pdev->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) static int vm_cmdline_get(char *buffer, const struct kernel_param *kp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) buffer[0] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) device_for_each_child(&vm_cmdline_parent, buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) vm_cmdline_get_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) return strlen(buffer) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) static const struct kernel_param_ops vm_cmdline_param_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) .set = vm_cmdline_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) .get = vm_cmdline_get,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) device_param_cb(device, &vm_cmdline_param_ops, NULL, S_IRUSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) static int vm_unregister_cmdline_device(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) platform_device_unregister(to_platform_device(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) static void vm_unregister_cmdline_devices(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) if (vm_cmdline_parent_registered) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) device_for_each_child(&vm_cmdline_parent, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) vm_unregister_cmdline_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) device_unregister(&vm_cmdline_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) vm_cmdline_parent_registered = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) static void vm_unregister_cmdline_devices(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) static int virtio_mmio_freeze(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) struct platform_device *pdev = to_platform_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) return virtio_device_freeze(&vm_dev->vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) static int virtio_mmio_restore(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) struct platform_device *pdev = to_platform_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) return virtio_device_restore(&vm_dev->vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) static SIMPLE_DEV_PM_OPS(virtio_mmio_pm_ops, virtio_mmio_freeze, virtio_mmio_restore);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) /* Platform driver */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) static const struct of_device_id virtio_mmio_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) { .compatible = "virtio,mmio", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) MODULE_DEVICE_TABLE(of, virtio_mmio_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) #ifdef CONFIG_ACPI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) static const struct acpi_device_id virtio_mmio_acpi_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) { "LNRO0005", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) MODULE_DEVICE_TABLE(acpi, virtio_mmio_acpi_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) static struct platform_driver virtio_mmio_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) .probe = virtio_mmio_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) .remove = virtio_mmio_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) .name = "virtio-mmio",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) .of_match_table = virtio_mmio_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) .acpi_match_table = ACPI_PTR(virtio_mmio_acpi_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) .pm = &virtio_mmio_pm_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) static int __init virtio_mmio_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) return platform_driver_register(&virtio_mmio_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) static void __exit virtio_mmio_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) platform_driver_unregister(&virtio_mmio_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) vm_unregister_cmdline_devices();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) module_init(virtio_mmio_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) module_exit(virtio_mmio_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) MODULE_DESCRIPTION("Platform bus driver for memory mapped virtio devices");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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