mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
1178 lines
29 KiB
C
1178 lines
29 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Virtio driver for the paravirtualized IOMMU
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*
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* Copyright (C) 2019 Arm Limited
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/amba/bus.h>
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#include <linux/delay.h>
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#include <linux/dma-iommu.h>
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#include <linux/freezer.h>
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#include <linux/interval_tree.h>
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#include <linux/iommu.h>
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#include <linux/module.h>
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#include <linux/of_iommu.h>
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#include <linux/of_platform.h>
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#include <linux/pci.h>
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#include <linux/platform_device.h>
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#include <linux/virtio.h>
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#include <linux/virtio_config.h>
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#include <linux/virtio_ids.h>
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#include <linux/wait.h>
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#include <uapi/linux/virtio_iommu.h>
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#define MSI_IOVA_BASE 0x8000000
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#define MSI_IOVA_LENGTH 0x100000
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#define VIOMMU_REQUEST_VQ 0
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#define VIOMMU_EVENT_VQ 1
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#define VIOMMU_NR_VQS 2
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struct viommu_dev {
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struct iommu_device iommu;
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struct device *dev;
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struct virtio_device *vdev;
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struct ida domain_ids;
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struct virtqueue *vqs[VIOMMU_NR_VQS];
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spinlock_t request_lock;
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struct list_head requests;
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void *evts;
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/* Device configuration */
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struct iommu_domain_geometry geometry;
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u64 pgsize_bitmap;
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u32 first_domain;
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u32 last_domain;
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/* Supported MAP flags */
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u32 map_flags;
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u32 probe_size;
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};
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struct viommu_mapping {
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phys_addr_t paddr;
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struct interval_tree_node iova;
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u32 flags;
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};
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struct viommu_domain {
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struct iommu_domain domain;
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struct viommu_dev *viommu;
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struct mutex mutex; /* protects viommu pointer */
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unsigned int id;
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u32 map_flags;
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spinlock_t mappings_lock;
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struct rb_root_cached mappings;
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unsigned long nr_endpoints;
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};
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struct viommu_endpoint {
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struct device *dev;
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struct viommu_dev *viommu;
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struct viommu_domain *vdomain;
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struct list_head resv_regions;
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};
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struct viommu_request {
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struct list_head list;
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void *writeback;
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unsigned int write_offset;
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unsigned int len;
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char buf[];
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};
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#define VIOMMU_FAULT_RESV_MASK 0xffffff00
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struct viommu_event {
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union {
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u32 head;
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struct virtio_iommu_fault fault;
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};
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};
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#define to_viommu_domain(domain) \
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container_of(domain, struct viommu_domain, domain)
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static int viommu_get_req_errno(void *buf, size_t len)
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{
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struct virtio_iommu_req_tail *tail = buf + len - sizeof(*tail);
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switch (tail->status) {
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case VIRTIO_IOMMU_S_OK:
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return 0;
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case VIRTIO_IOMMU_S_UNSUPP:
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return -ENOSYS;
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case VIRTIO_IOMMU_S_INVAL:
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return -EINVAL;
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case VIRTIO_IOMMU_S_RANGE:
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return -ERANGE;
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case VIRTIO_IOMMU_S_NOENT:
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return -ENOENT;
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case VIRTIO_IOMMU_S_FAULT:
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return -EFAULT;
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case VIRTIO_IOMMU_S_NOMEM:
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return -ENOMEM;
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case VIRTIO_IOMMU_S_IOERR:
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case VIRTIO_IOMMU_S_DEVERR:
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default:
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return -EIO;
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}
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}
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static void viommu_set_req_status(void *buf, size_t len, int status)
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{
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struct virtio_iommu_req_tail *tail = buf + len - sizeof(*tail);
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tail->status = status;
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}
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static off_t viommu_get_write_desc_offset(struct viommu_dev *viommu,
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struct virtio_iommu_req_head *req,
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size_t len)
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{
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size_t tail_size = sizeof(struct virtio_iommu_req_tail);
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if (req->type == VIRTIO_IOMMU_T_PROBE)
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return len - viommu->probe_size - tail_size;
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return len - tail_size;
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}
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/*
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* __viommu_sync_req - Complete all in-flight requests
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*
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* Wait for all added requests to complete. When this function returns, all
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* requests that were in-flight at the time of the call have completed.
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*/
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static int __viommu_sync_req(struct viommu_dev *viommu)
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{
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unsigned int len;
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size_t write_len;
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struct viommu_request *req;
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struct virtqueue *vq = viommu->vqs[VIOMMU_REQUEST_VQ];
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assert_spin_locked(&viommu->request_lock);
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virtqueue_kick(vq);
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while (!list_empty(&viommu->requests)) {
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len = 0;
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req = virtqueue_get_buf(vq, &len);
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if (!req)
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continue;
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if (!len)
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viommu_set_req_status(req->buf, req->len,
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VIRTIO_IOMMU_S_IOERR);
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write_len = req->len - req->write_offset;
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if (req->writeback && len == write_len)
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memcpy(req->writeback, req->buf + req->write_offset,
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write_len);
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list_del(&req->list);
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kfree(req);
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}
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return 0;
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}
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static int viommu_sync_req(struct viommu_dev *viommu)
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{
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int ret;
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unsigned long flags;
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spin_lock_irqsave(&viommu->request_lock, flags);
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ret = __viommu_sync_req(viommu);
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if (ret)
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dev_dbg(viommu->dev, "could not sync requests (%d)\n", ret);
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spin_unlock_irqrestore(&viommu->request_lock, flags);
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return ret;
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}
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/*
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* __viommu_add_request - Add one request to the queue
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* @buf: pointer to the request buffer
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* @len: length of the request buffer
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* @writeback: copy data back to the buffer when the request completes.
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*
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* Add a request to the queue. Only synchronize the queue if it's already full.
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* Otherwise don't kick the queue nor wait for requests to complete.
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*
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* When @writeback is true, data written by the device, including the request
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* status, is copied into @buf after the request completes. This is unsafe if
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* the caller allocates @buf on stack and drops the lock between add_req() and
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* sync_req().
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*
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* Return 0 if the request was successfully added to the queue.
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*/
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static int __viommu_add_req(struct viommu_dev *viommu, void *buf, size_t len,
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bool writeback)
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{
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int ret;
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off_t write_offset;
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struct viommu_request *req;
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struct scatterlist top_sg, bottom_sg;
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struct scatterlist *sg[2] = { &top_sg, &bottom_sg };
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struct virtqueue *vq = viommu->vqs[VIOMMU_REQUEST_VQ];
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assert_spin_locked(&viommu->request_lock);
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write_offset = viommu_get_write_desc_offset(viommu, buf, len);
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if (write_offset <= 0)
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return -EINVAL;
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req = kzalloc(sizeof(*req) + len, GFP_ATOMIC);
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if (!req)
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return -ENOMEM;
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req->len = len;
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if (writeback) {
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req->writeback = buf + write_offset;
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req->write_offset = write_offset;
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}
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memcpy(&req->buf, buf, write_offset);
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sg_init_one(&top_sg, req->buf, write_offset);
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sg_init_one(&bottom_sg, req->buf + write_offset, len - write_offset);
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ret = virtqueue_add_sgs(vq, sg, 1, 1, req, GFP_ATOMIC);
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if (ret == -ENOSPC) {
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/* If the queue is full, sync and retry */
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if (!__viommu_sync_req(viommu))
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ret = virtqueue_add_sgs(vq, sg, 1, 1, req, GFP_ATOMIC);
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}
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if (ret)
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goto err_free;
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list_add_tail(&req->list, &viommu->requests);
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return 0;
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err_free:
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kfree(req);
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return ret;
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}
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static int viommu_add_req(struct viommu_dev *viommu, void *buf, size_t len)
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{
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int ret;
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unsigned long flags;
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spin_lock_irqsave(&viommu->request_lock, flags);
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ret = __viommu_add_req(viommu, buf, len, false);
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if (ret)
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dev_dbg(viommu->dev, "could not add request: %d\n", ret);
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spin_unlock_irqrestore(&viommu->request_lock, flags);
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return ret;
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}
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/*
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* Send a request and wait for it to complete. Return the request status (as an
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* errno)
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*/
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static int viommu_send_req_sync(struct viommu_dev *viommu, void *buf,
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size_t len)
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{
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int ret;
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unsigned long flags;
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spin_lock_irqsave(&viommu->request_lock, flags);
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ret = __viommu_add_req(viommu, buf, len, true);
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if (ret) {
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dev_dbg(viommu->dev, "could not add request (%d)\n", ret);
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goto out_unlock;
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}
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ret = __viommu_sync_req(viommu);
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if (ret) {
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dev_dbg(viommu->dev, "could not sync requests (%d)\n", ret);
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/* Fall-through (get the actual request status) */
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}
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ret = viommu_get_req_errno(buf, len);
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out_unlock:
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spin_unlock_irqrestore(&viommu->request_lock, flags);
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return ret;
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}
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/*
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* viommu_add_mapping - add a mapping to the internal tree
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*
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* On success, return the new mapping. Otherwise return NULL.
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*/
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static int viommu_add_mapping(struct viommu_domain *vdomain, unsigned long iova,
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phys_addr_t paddr, size_t size, u32 flags)
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{
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unsigned long irqflags;
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struct viommu_mapping *mapping;
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mapping = kzalloc(sizeof(*mapping), GFP_ATOMIC);
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if (!mapping)
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return -ENOMEM;
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mapping->paddr = paddr;
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mapping->iova.start = iova;
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mapping->iova.last = iova + size - 1;
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mapping->flags = flags;
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spin_lock_irqsave(&vdomain->mappings_lock, irqflags);
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interval_tree_insert(&mapping->iova, &vdomain->mappings);
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spin_unlock_irqrestore(&vdomain->mappings_lock, irqflags);
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return 0;
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}
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/*
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* viommu_del_mappings - remove mappings from the internal tree
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*
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* @vdomain: the domain
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* @iova: start of the range
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* @size: size of the range. A size of 0 corresponds to the entire address
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* space.
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*
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* On success, returns the number of unmapped bytes (>= size)
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*/
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static size_t viommu_del_mappings(struct viommu_domain *vdomain,
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unsigned long iova, size_t size)
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{
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size_t unmapped = 0;
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unsigned long flags;
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unsigned long last = iova + size - 1;
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struct viommu_mapping *mapping = NULL;
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struct interval_tree_node *node, *next;
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spin_lock_irqsave(&vdomain->mappings_lock, flags);
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next = interval_tree_iter_first(&vdomain->mappings, iova, last);
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while (next) {
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node = next;
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mapping = container_of(node, struct viommu_mapping, iova);
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next = interval_tree_iter_next(node, iova, last);
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/* Trying to split a mapping? */
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if (mapping->iova.start < iova)
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break;
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/*
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* Virtio-iommu doesn't allow UNMAP to split a mapping created
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* with a single MAP request, so remove the full mapping.
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*/
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unmapped += mapping->iova.last - mapping->iova.start + 1;
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interval_tree_remove(node, &vdomain->mappings);
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kfree(mapping);
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}
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spin_unlock_irqrestore(&vdomain->mappings_lock, flags);
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return unmapped;
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}
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/*
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* viommu_replay_mappings - re-send MAP requests
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*
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* When reattaching a domain that was previously detached from all endpoints,
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* mappings were deleted from the device. Re-create the mappings available in
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* the internal tree.
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*/
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static int viommu_replay_mappings(struct viommu_domain *vdomain)
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{
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int ret = 0;
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unsigned long flags;
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struct viommu_mapping *mapping;
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struct interval_tree_node *node;
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struct virtio_iommu_req_map map;
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spin_lock_irqsave(&vdomain->mappings_lock, flags);
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node = interval_tree_iter_first(&vdomain->mappings, 0, -1UL);
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while (node) {
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mapping = container_of(node, struct viommu_mapping, iova);
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map = (struct virtio_iommu_req_map) {
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.head.type = VIRTIO_IOMMU_T_MAP,
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.domain = cpu_to_le32(vdomain->id),
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.virt_start = cpu_to_le64(mapping->iova.start),
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.virt_end = cpu_to_le64(mapping->iova.last),
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.phys_start = cpu_to_le64(mapping->paddr),
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.flags = cpu_to_le32(mapping->flags),
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};
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ret = viommu_send_req_sync(vdomain->viommu, &map, sizeof(map));
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if (ret)
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break;
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node = interval_tree_iter_next(node, 0, -1UL);
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}
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spin_unlock_irqrestore(&vdomain->mappings_lock, flags);
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return ret;
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}
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static int viommu_add_resv_mem(struct viommu_endpoint *vdev,
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struct virtio_iommu_probe_resv_mem *mem,
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size_t len)
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{
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size_t size;
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u64 start64, end64;
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phys_addr_t start, end;
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struct iommu_resv_region *region = NULL;
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unsigned long prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
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start = start64 = le64_to_cpu(mem->start);
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end = end64 = le64_to_cpu(mem->end);
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size = end64 - start64 + 1;
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/* Catch any overflow, including the unlikely end64 - start64 + 1 = 0 */
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if (start != start64 || end != end64 || size < end64 - start64)
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return -EOVERFLOW;
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if (len < sizeof(*mem))
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return -EINVAL;
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switch (mem->subtype) {
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default:
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dev_warn(vdev->dev, "unknown resv mem subtype 0x%x\n",
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mem->subtype);
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/* Fall-through */
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case VIRTIO_IOMMU_RESV_MEM_T_RESERVED:
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region = iommu_alloc_resv_region(start, size, 0,
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IOMMU_RESV_RESERVED);
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break;
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case VIRTIO_IOMMU_RESV_MEM_T_MSI:
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region = iommu_alloc_resv_region(start, size, prot,
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IOMMU_RESV_MSI);
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break;
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}
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if (!region)
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return -ENOMEM;
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list_add(&vdev->resv_regions, ®ion->list);
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return 0;
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}
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static int viommu_probe_endpoint(struct viommu_dev *viommu, struct device *dev)
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{
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int ret;
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u16 type, len;
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size_t cur = 0;
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size_t probe_len;
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struct virtio_iommu_req_probe *probe;
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struct virtio_iommu_probe_property *prop;
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struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
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struct viommu_endpoint *vdev = dev_iommu_priv_get(dev);
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if (!fwspec->num_ids)
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return -EINVAL;
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probe_len = sizeof(*probe) + viommu->probe_size +
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sizeof(struct virtio_iommu_req_tail);
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probe = kzalloc(probe_len, GFP_KERNEL);
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if (!probe)
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return -ENOMEM;
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probe->head.type = VIRTIO_IOMMU_T_PROBE;
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/*
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* For now, assume that properties of an endpoint that outputs multiple
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* IDs are consistent. Only probe the first one.
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*/
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probe->endpoint = cpu_to_le32(fwspec->ids[0]);
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ret = viommu_send_req_sync(viommu, probe, probe_len);
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if (ret)
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goto out_free;
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prop = (void *)probe->properties;
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type = le16_to_cpu(prop->type) & VIRTIO_IOMMU_PROBE_T_MASK;
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while (type != VIRTIO_IOMMU_PROBE_T_NONE &&
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cur < viommu->probe_size) {
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len = le16_to_cpu(prop->length) + sizeof(*prop);
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switch (type) {
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case VIRTIO_IOMMU_PROBE_T_RESV_MEM:
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ret = viommu_add_resv_mem(vdev, (void *)prop, len);
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break;
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default:
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dev_err(dev, "unknown viommu prop 0x%x\n", type);
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}
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|
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if (ret)
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dev_err(dev, "failed to parse viommu prop 0x%x\n", type);
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cur += len;
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if (cur >= viommu->probe_size)
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break;
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prop = (void *)probe->properties + cur;
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|
type = le16_to_cpu(prop->type) & VIRTIO_IOMMU_PROBE_T_MASK;
|
|
}
|
|
|
|
out_free:
|
|
kfree(probe);
|
|
return ret;
|
|
}
|
|
|
|
static int viommu_fault_handler(struct viommu_dev *viommu,
|
|
struct virtio_iommu_fault *fault)
|
|
{
|
|
char *reason_str;
|
|
|
|
u8 reason = fault->reason;
|
|
u32 flags = le32_to_cpu(fault->flags);
|
|
u32 endpoint = le32_to_cpu(fault->endpoint);
|
|
u64 address = le64_to_cpu(fault->address);
|
|
|
|
switch (reason) {
|
|
case VIRTIO_IOMMU_FAULT_R_DOMAIN:
|
|
reason_str = "domain";
|
|
break;
|
|
case VIRTIO_IOMMU_FAULT_R_MAPPING:
|
|
reason_str = "page";
|
|
break;
|
|
case VIRTIO_IOMMU_FAULT_R_UNKNOWN:
|
|
default:
|
|
reason_str = "unknown";
|
|
break;
|
|
}
|
|
|
|
/* TODO: find EP by ID and report_iommu_fault */
|
|
if (flags & VIRTIO_IOMMU_FAULT_F_ADDRESS)
|
|
dev_err_ratelimited(viommu->dev, "%s fault from EP %u at %#llx [%s%s%s]\n",
|
|
reason_str, endpoint, address,
|
|
flags & VIRTIO_IOMMU_FAULT_F_READ ? "R" : "",
|
|
flags & VIRTIO_IOMMU_FAULT_F_WRITE ? "W" : "",
|
|
flags & VIRTIO_IOMMU_FAULT_F_EXEC ? "X" : "");
|
|
else
|
|
dev_err_ratelimited(viommu->dev, "%s fault from EP %u\n",
|
|
reason_str, endpoint);
|
|
return 0;
|
|
}
|
|
|
|
static void viommu_event_handler(struct virtqueue *vq)
|
|
{
|
|
int ret;
|
|
unsigned int len;
|
|
struct scatterlist sg[1];
|
|
struct viommu_event *evt;
|
|
struct viommu_dev *viommu = vq->vdev->priv;
|
|
|
|
while ((evt = virtqueue_get_buf(vq, &len)) != NULL) {
|
|
if (len > sizeof(*evt)) {
|
|
dev_err(viommu->dev,
|
|
"invalid event buffer (len %u != %zu)\n",
|
|
len, sizeof(*evt));
|
|
} else if (!(evt->head & VIOMMU_FAULT_RESV_MASK)) {
|
|
viommu_fault_handler(viommu, &evt->fault);
|
|
}
|
|
|
|
sg_init_one(sg, evt, sizeof(*evt));
|
|
ret = virtqueue_add_inbuf(vq, sg, 1, evt, GFP_ATOMIC);
|
|
if (ret)
|
|
dev_err(viommu->dev, "could not add event buffer\n");
|
|
}
|
|
|
|
virtqueue_kick(vq);
|
|
}
|
|
|
|
/* IOMMU API */
|
|
|
|
static struct iommu_domain *viommu_domain_alloc(unsigned type)
|
|
{
|
|
struct viommu_domain *vdomain;
|
|
|
|
if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
|
|
return NULL;
|
|
|
|
vdomain = kzalloc(sizeof(*vdomain), GFP_KERNEL);
|
|
if (!vdomain)
|
|
return NULL;
|
|
|
|
mutex_init(&vdomain->mutex);
|
|
spin_lock_init(&vdomain->mappings_lock);
|
|
vdomain->mappings = RB_ROOT_CACHED;
|
|
|
|
if (type == IOMMU_DOMAIN_DMA &&
|
|
iommu_get_dma_cookie(&vdomain->domain)) {
|
|
kfree(vdomain);
|
|
return NULL;
|
|
}
|
|
|
|
return &vdomain->domain;
|
|
}
|
|
|
|
static int viommu_domain_finalise(struct viommu_endpoint *vdev,
|
|
struct iommu_domain *domain)
|
|
{
|
|
int ret;
|
|
unsigned long viommu_page_size;
|
|
struct viommu_dev *viommu = vdev->viommu;
|
|
struct viommu_domain *vdomain = to_viommu_domain(domain);
|
|
|
|
viommu_page_size = 1UL << __ffs(viommu->pgsize_bitmap);
|
|
if (viommu_page_size > PAGE_SIZE) {
|
|
dev_err(vdev->dev,
|
|
"granule 0x%lx larger than system page size 0x%lx\n",
|
|
viommu_page_size, PAGE_SIZE);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = ida_alloc_range(&viommu->domain_ids, viommu->first_domain,
|
|
viommu->last_domain, GFP_KERNEL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
vdomain->id = (unsigned int)ret;
|
|
|
|
domain->pgsize_bitmap = viommu->pgsize_bitmap;
|
|
domain->geometry = viommu->geometry;
|
|
|
|
vdomain->map_flags = viommu->map_flags;
|
|
vdomain->viommu = viommu;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void viommu_domain_free(struct iommu_domain *domain)
|
|
{
|
|
struct viommu_domain *vdomain = to_viommu_domain(domain);
|
|
|
|
iommu_put_dma_cookie(domain);
|
|
|
|
/* Free all remaining mappings (size 2^64) */
|
|
viommu_del_mappings(vdomain, 0, 0);
|
|
|
|
if (vdomain->viommu)
|
|
ida_free(&vdomain->viommu->domain_ids, vdomain->id);
|
|
|
|
kfree(vdomain);
|
|
}
|
|
|
|
static int viommu_attach_dev(struct iommu_domain *domain, struct device *dev)
|
|
{
|
|
int i;
|
|
int ret = 0;
|
|
struct virtio_iommu_req_attach req;
|
|
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
|
|
struct viommu_endpoint *vdev = dev_iommu_priv_get(dev);
|
|
struct viommu_domain *vdomain = to_viommu_domain(domain);
|
|
|
|
mutex_lock(&vdomain->mutex);
|
|
if (!vdomain->viommu) {
|
|
/*
|
|
* Properly initialize the domain now that we know which viommu
|
|
* owns it.
|
|
*/
|
|
ret = viommu_domain_finalise(vdev, domain);
|
|
} else if (vdomain->viommu != vdev->viommu) {
|
|
dev_err(dev, "cannot attach to foreign vIOMMU\n");
|
|
ret = -EXDEV;
|
|
}
|
|
mutex_unlock(&vdomain->mutex);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* In the virtio-iommu device, when attaching the endpoint to a new
|
|
* domain, it is detached from the old one and, if as as a result the
|
|
* old domain isn't attached to any endpoint, all mappings are removed
|
|
* from the old domain and it is freed.
|
|
*
|
|
* In the driver the old domain still exists, and its mappings will be
|
|
* recreated if it gets reattached to an endpoint. Otherwise it will be
|
|
* freed explicitly.
|
|
*
|
|
* vdev->vdomain is protected by group->mutex
|
|
*/
|
|
if (vdev->vdomain)
|
|
vdev->vdomain->nr_endpoints--;
|
|
|
|
req = (struct virtio_iommu_req_attach) {
|
|
.head.type = VIRTIO_IOMMU_T_ATTACH,
|
|
.domain = cpu_to_le32(vdomain->id),
|
|
};
|
|
|
|
for (i = 0; i < fwspec->num_ids; i++) {
|
|
req.endpoint = cpu_to_le32(fwspec->ids[i]);
|
|
|
|
ret = viommu_send_req_sync(vdomain->viommu, &req, sizeof(req));
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
if (!vdomain->nr_endpoints) {
|
|
/*
|
|
* This endpoint is the first to be attached to the domain.
|
|
* Replay existing mappings (e.g. SW MSI).
|
|
*/
|
|
ret = viommu_replay_mappings(vdomain);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
vdomain->nr_endpoints++;
|
|
vdev->vdomain = vdomain;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int viommu_map(struct iommu_domain *domain, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
|
|
{
|
|
int ret;
|
|
u32 flags;
|
|
struct virtio_iommu_req_map map;
|
|
struct viommu_domain *vdomain = to_viommu_domain(domain);
|
|
|
|
flags = (prot & IOMMU_READ ? VIRTIO_IOMMU_MAP_F_READ : 0) |
|
|
(prot & IOMMU_WRITE ? VIRTIO_IOMMU_MAP_F_WRITE : 0) |
|
|
(prot & IOMMU_MMIO ? VIRTIO_IOMMU_MAP_F_MMIO : 0);
|
|
|
|
if (flags & ~vdomain->map_flags)
|
|
return -EINVAL;
|
|
|
|
ret = viommu_add_mapping(vdomain, iova, paddr, size, flags);
|
|
if (ret)
|
|
return ret;
|
|
|
|
map = (struct virtio_iommu_req_map) {
|
|
.head.type = VIRTIO_IOMMU_T_MAP,
|
|
.domain = cpu_to_le32(vdomain->id),
|
|
.virt_start = cpu_to_le64(iova),
|
|
.phys_start = cpu_to_le64(paddr),
|
|
.virt_end = cpu_to_le64(iova + size - 1),
|
|
.flags = cpu_to_le32(flags),
|
|
};
|
|
|
|
if (!vdomain->nr_endpoints)
|
|
return 0;
|
|
|
|
ret = viommu_send_req_sync(vdomain->viommu, &map, sizeof(map));
|
|
if (ret)
|
|
viommu_del_mappings(vdomain, iova, size);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static size_t viommu_unmap(struct iommu_domain *domain, unsigned long iova,
|
|
size_t size, struct iommu_iotlb_gather *gather)
|
|
{
|
|
int ret = 0;
|
|
size_t unmapped;
|
|
struct virtio_iommu_req_unmap unmap;
|
|
struct viommu_domain *vdomain = to_viommu_domain(domain);
|
|
|
|
unmapped = viommu_del_mappings(vdomain, iova, size);
|
|
if (unmapped < size)
|
|
return 0;
|
|
|
|
/* Device already removed all mappings after detach. */
|
|
if (!vdomain->nr_endpoints)
|
|
return unmapped;
|
|
|
|
unmap = (struct virtio_iommu_req_unmap) {
|
|
.head.type = VIRTIO_IOMMU_T_UNMAP,
|
|
.domain = cpu_to_le32(vdomain->id),
|
|
.virt_start = cpu_to_le64(iova),
|
|
.virt_end = cpu_to_le64(iova + unmapped - 1),
|
|
};
|
|
|
|
ret = viommu_add_req(vdomain->viommu, &unmap, sizeof(unmap));
|
|
return ret ? 0 : unmapped;
|
|
}
|
|
|
|
static phys_addr_t viommu_iova_to_phys(struct iommu_domain *domain,
|
|
dma_addr_t iova)
|
|
{
|
|
u64 paddr = 0;
|
|
unsigned long flags;
|
|
struct viommu_mapping *mapping;
|
|
struct interval_tree_node *node;
|
|
struct viommu_domain *vdomain = to_viommu_domain(domain);
|
|
|
|
spin_lock_irqsave(&vdomain->mappings_lock, flags);
|
|
node = interval_tree_iter_first(&vdomain->mappings, iova, iova);
|
|
if (node) {
|
|
mapping = container_of(node, struct viommu_mapping, iova);
|
|
paddr = mapping->paddr + (iova - mapping->iova.start);
|
|
}
|
|
spin_unlock_irqrestore(&vdomain->mappings_lock, flags);
|
|
|
|
return paddr;
|
|
}
|
|
|
|
static void viommu_iotlb_sync(struct iommu_domain *domain,
|
|
struct iommu_iotlb_gather *gather)
|
|
{
|
|
struct viommu_domain *vdomain = to_viommu_domain(domain);
|
|
|
|
viommu_sync_req(vdomain->viommu);
|
|
}
|
|
|
|
static void viommu_get_resv_regions(struct device *dev, struct list_head *head)
|
|
{
|
|
struct iommu_resv_region *entry, *new_entry, *msi = NULL;
|
|
struct viommu_endpoint *vdev = dev_iommu_priv_get(dev);
|
|
int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
|
|
|
|
list_for_each_entry(entry, &vdev->resv_regions, list) {
|
|
if (entry->type == IOMMU_RESV_MSI)
|
|
msi = entry;
|
|
|
|
new_entry = kmemdup(entry, sizeof(*entry), GFP_KERNEL);
|
|
if (!new_entry)
|
|
return;
|
|
list_add_tail(&new_entry->list, head);
|
|
}
|
|
|
|
/*
|
|
* If the device didn't register any bypass MSI window, add a
|
|
* software-mapped region.
|
|
*/
|
|
if (!msi) {
|
|
msi = iommu_alloc_resv_region(MSI_IOVA_BASE, MSI_IOVA_LENGTH,
|
|
prot, IOMMU_RESV_SW_MSI);
|
|
if (!msi)
|
|
return;
|
|
|
|
list_add_tail(&msi->list, head);
|
|
}
|
|
|
|
iommu_dma_get_resv_regions(dev, head);
|
|
}
|
|
|
|
static struct iommu_ops viommu_ops;
|
|
static struct virtio_driver virtio_iommu_drv;
|
|
|
|
static int viommu_match_node(struct device *dev, const void *data)
|
|
{
|
|
return dev->parent->fwnode == data;
|
|
}
|
|
|
|
static struct viommu_dev *viommu_get_by_fwnode(struct fwnode_handle *fwnode)
|
|
{
|
|
struct device *dev = driver_find_device(&virtio_iommu_drv.driver, NULL,
|
|
fwnode, viommu_match_node);
|
|
put_device(dev);
|
|
|
|
return dev ? dev_to_virtio(dev)->priv : NULL;
|
|
}
|
|
|
|
static int viommu_add_device(struct device *dev)
|
|
{
|
|
int ret;
|
|
struct iommu_group *group;
|
|
struct viommu_endpoint *vdev;
|
|
struct viommu_dev *viommu = NULL;
|
|
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
|
|
|
|
if (!fwspec || fwspec->ops != &viommu_ops)
|
|
return -ENODEV;
|
|
|
|
viommu = viommu_get_by_fwnode(fwspec->iommu_fwnode);
|
|
if (!viommu)
|
|
return -ENODEV;
|
|
|
|
vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
|
|
if (!vdev)
|
|
return -ENOMEM;
|
|
|
|
vdev->dev = dev;
|
|
vdev->viommu = viommu;
|
|
INIT_LIST_HEAD(&vdev->resv_regions);
|
|
dev_iommu_priv_set(dev, vdev);
|
|
|
|
if (viommu->probe_size) {
|
|
/* Get additional information for this endpoint */
|
|
ret = viommu_probe_endpoint(viommu, dev);
|
|
if (ret)
|
|
goto err_free_dev;
|
|
}
|
|
|
|
ret = iommu_device_link(&viommu->iommu, dev);
|
|
if (ret)
|
|
goto err_free_dev;
|
|
|
|
/*
|
|
* Last step creates a default domain and attaches to it. Everything
|
|
* must be ready.
|
|
*/
|
|
group = iommu_group_get_for_dev(dev);
|
|
if (IS_ERR(group)) {
|
|
ret = PTR_ERR(group);
|
|
goto err_unlink_dev;
|
|
}
|
|
|
|
iommu_group_put(group);
|
|
|
|
return PTR_ERR_OR_ZERO(group);
|
|
|
|
err_unlink_dev:
|
|
iommu_device_unlink(&viommu->iommu, dev);
|
|
err_free_dev:
|
|
generic_iommu_put_resv_regions(dev, &vdev->resv_regions);
|
|
kfree(vdev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void viommu_remove_device(struct device *dev)
|
|
{
|
|
struct viommu_endpoint *vdev;
|
|
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
|
|
|
|
if (!fwspec || fwspec->ops != &viommu_ops)
|
|
return;
|
|
|
|
vdev = dev_iommu_priv_get(dev);
|
|
|
|
iommu_group_remove_device(dev);
|
|
iommu_device_unlink(&vdev->viommu->iommu, dev);
|
|
generic_iommu_put_resv_regions(dev, &vdev->resv_regions);
|
|
kfree(vdev);
|
|
}
|
|
|
|
static struct iommu_group *viommu_device_group(struct device *dev)
|
|
{
|
|
if (dev_is_pci(dev))
|
|
return pci_device_group(dev);
|
|
else
|
|
return generic_device_group(dev);
|
|
}
|
|
|
|
static int viommu_of_xlate(struct device *dev, struct of_phandle_args *args)
|
|
{
|
|
return iommu_fwspec_add_ids(dev, args->args, 1);
|
|
}
|
|
|
|
static struct iommu_ops viommu_ops = {
|
|
.domain_alloc = viommu_domain_alloc,
|
|
.domain_free = viommu_domain_free,
|
|
.attach_dev = viommu_attach_dev,
|
|
.map = viommu_map,
|
|
.unmap = viommu_unmap,
|
|
.iova_to_phys = viommu_iova_to_phys,
|
|
.iotlb_sync = viommu_iotlb_sync,
|
|
.add_device = viommu_add_device,
|
|
.remove_device = viommu_remove_device,
|
|
.device_group = viommu_device_group,
|
|
.get_resv_regions = viommu_get_resv_regions,
|
|
.put_resv_regions = generic_iommu_put_resv_regions,
|
|
.of_xlate = viommu_of_xlate,
|
|
};
|
|
|
|
static int viommu_init_vqs(struct viommu_dev *viommu)
|
|
{
|
|
struct virtio_device *vdev = dev_to_virtio(viommu->dev);
|
|
const char *names[] = { "request", "event" };
|
|
vq_callback_t *callbacks[] = {
|
|
NULL, /* No async requests */
|
|
viommu_event_handler,
|
|
};
|
|
|
|
return virtio_find_vqs(vdev, VIOMMU_NR_VQS, viommu->vqs, callbacks,
|
|
names, NULL);
|
|
}
|
|
|
|
static int viommu_fill_evtq(struct viommu_dev *viommu)
|
|
{
|
|
int i, ret;
|
|
struct scatterlist sg[1];
|
|
struct viommu_event *evts;
|
|
struct virtqueue *vq = viommu->vqs[VIOMMU_EVENT_VQ];
|
|
size_t nr_evts = vq->num_free;
|
|
|
|
viommu->evts = evts = devm_kmalloc_array(viommu->dev, nr_evts,
|
|
sizeof(*evts), GFP_KERNEL);
|
|
if (!evts)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < nr_evts; i++) {
|
|
sg_init_one(sg, &evts[i], sizeof(*evts));
|
|
ret = virtqueue_add_inbuf(vq, sg, 1, &evts[i], GFP_KERNEL);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int viommu_probe(struct virtio_device *vdev)
|
|
{
|
|
struct device *parent_dev = vdev->dev.parent;
|
|
struct viommu_dev *viommu = NULL;
|
|
struct device *dev = &vdev->dev;
|
|
u64 input_start = 0;
|
|
u64 input_end = -1UL;
|
|
int ret;
|
|
|
|
if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1) ||
|
|
!virtio_has_feature(vdev, VIRTIO_IOMMU_F_MAP_UNMAP))
|
|
return -ENODEV;
|
|
|
|
viommu = devm_kzalloc(dev, sizeof(*viommu), GFP_KERNEL);
|
|
if (!viommu)
|
|
return -ENOMEM;
|
|
|
|
spin_lock_init(&viommu->request_lock);
|
|
ida_init(&viommu->domain_ids);
|
|
viommu->dev = dev;
|
|
viommu->vdev = vdev;
|
|
INIT_LIST_HEAD(&viommu->requests);
|
|
|
|
ret = viommu_init_vqs(viommu);
|
|
if (ret)
|
|
return ret;
|
|
|
|
virtio_cread(vdev, struct virtio_iommu_config, page_size_mask,
|
|
&viommu->pgsize_bitmap);
|
|
|
|
if (!viommu->pgsize_bitmap) {
|
|
ret = -EINVAL;
|
|
goto err_free_vqs;
|
|
}
|
|
|
|
viommu->map_flags = VIRTIO_IOMMU_MAP_F_READ | VIRTIO_IOMMU_MAP_F_WRITE;
|
|
viommu->last_domain = ~0U;
|
|
|
|
/* Optional features */
|
|
virtio_cread_feature(vdev, VIRTIO_IOMMU_F_INPUT_RANGE,
|
|
struct virtio_iommu_config, input_range.start,
|
|
&input_start);
|
|
|
|
virtio_cread_feature(vdev, VIRTIO_IOMMU_F_INPUT_RANGE,
|
|
struct virtio_iommu_config, input_range.end,
|
|
&input_end);
|
|
|
|
virtio_cread_feature(vdev, VIRTIO_IOMMU_F_DOMAIN_RANGE,
|
|
struct virtio_iommu_config, domain_range.start,
|
|
&viommu->first_domain);
|
|
|
|
virtio_cread_feature(vdev, VIRTIO_IOMMU_F_DOMAIN_RANGE,
|
|
struct virtio_iommu_config, domain_range.end,
|
|
&viommu->last_domain);
|
|
|
|
virtio_cread_feature(vdev, VIRTIO_IOMMU_F_PROBE,
|
|
struct virtio_iommu_config, probe_size,
|
|
&viommu->probe_size);
|
|
|
|
viommu->geometry = (struct iommu_domain_geometry) {
|
|
.aperture_start = input_start,
|
|
.aperture_end = input_end,
|
|
.force_aperture = true,
|
|
};
|
|
|
|
if (virtio_has_feature(vdev, VIRTIO_IOMMU_F_MMIO))
|
|
viommu->map_flags |= VIRTIO_IOMMU_MAP_F_MMIO;
|
|
|
|
viommu_ops.pgsize_bitmap = viommu->pgsize_bitmap;
|
|
|
|
virtio_device_ready(vdev);
|
|
|
|
/* Populate the event queue with buffers */
|
|
ret = viommu_fill_evtq(viommu);
|
|
if (ret)
|
|
goto err_free_vqs;
|
|
|
|
ret = iommu_device_sysfs_add(&viommu->iommu, dev, NULL, "%s",
|
|
virtio_bus_name(vdev));
|
|
if (ret)
|
|
goto err_free_vqs;
|
|
|
|
iommu_device_set_ops(&viommu->iommu, &viommu_ops);
|
|
iommu_device_set_fwnode(&viommu->iommu, parent_dev->fwnode);
|
|
|
|
iommu_device_register(&viommu->iommu);
|
|
|
|
#ifdef CONFIG_PCI
|
|
if (pci_bus_type.iommu_ops != &viommu_ops) {
|
|
ret = bus_set_iommu(&pci_bus_type, &viommu_ops);
|
|
if (ret)
|
|
goto err_unregister;
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_ARM_AMBA
|
|
if (amba_bustype.iommu_ops != &viommu_ops) {
|
|
ret = bus_set_iommu(&amba_bustype, &viommu_ops);
|
|
if (ret)
|
|
goto err_unregister;
|
|
}
|
|
#endif
|
|
if (platform_bus_type.iommu_ops != &viommu_ops) {
|
|
ret = bus_set_iommu(&platform_bus_type, &viommu_ops);
|
|
if (ret)
|
|
goto err_unregister;
|
|
}
|
|
|
|
vdev->priv = viommu;
|
|
|
|
dev_info(dev, "input address: %u bits\n",
|
|
order_base_2(viommu->geometry.aperture_end));
|
|
dev_info(dev, "page mask: %#llx\n", viommu->pgsize_bitmap);
|
|
|
|
return 0;
|
|
|
|
err_unregister:
|
|
iommu_device_sysfs_remove(&viommu->iommu);
|
|
iommu_device_unregister(&viommu->iommu);
|
|
err_free_vqs:
|
|
vdev->config->del_vqs(vdev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void viommu_remove(struct virtio_device *vdev)
|
|
{
|
|
struct viommu_dev *viommu = vdev->priv;
|
|
|
|
iommu_device_sysfs_remove(&viommu->iommu);
|
|
iommu_device_unregister(&viommu->iommu);
|
|
|
|
/* Stop all virtqueues */
|
|
vdev->config->reset(vdev);
|
|
vdev->config->del_vqs(vdev);
|
|
|
|
dev_info(&vdev->dev, "device removed\n");
|
|
}
|
|
|
|
static void viommu_config_changed(struct virtio_device *vdev)
|
|
{
|
|
dev_warn(&vdev->dev, "config changed\n");
|
|
}
|
|
|
|
static unsigned int features[] = {
|
|
VIRTIO_IOMMU_F_MAP_UNMAP,
|
|
VIRTIO_IOMMU_F_INPUT_RANGE,
|
|
VIRTIO_IOMMU_F_DOMAIN_RANGE,
|
|
VIRTIO_IOMMU_F_PROBE,
|
|
VIRTIO_IOMMU_F_MMIO,
|
|
};
|
|
|
|
static struct virtio_device_id id_table[] = {
|
|
{ VIRTIO_ID_IOMMU, VIRTIO_DEV_ANY_ID },
|
|
{ 0 },
|
|
};
|
|
|
|
static struct virtio_driver virtio_iommu_drv = {
|
|
.driver.name = KBUILD_MODNAME,
|
|
.driver.owner = THIS_MODULE,
|
|
.id_table = id_table,
|
|
.feature_table = features,
|
|
.feature_table_size = ARRAY_SIZE(features),
|
|
.probe = viommu_probe,
|
|
.remove = viommu_remove,
|
|
.config_changed = viommu_config_changed,
|
|
};
|
|
|
|
module_virtio_driver(virtio_iommu_drv);
|
|
|
|
MODULE_DESCRIPTION("Virtio IOMMU driver");
|
|
MODULE_AUTHOR("Jean-Philippe Brucker <jean-philippe.brucker@arm.com>");
|
|
MODULE_LICENSE("GPL v2");
|