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-rw-r--r--drivers/xen/grant-dma-ops.c418
1 files changed, 418 insertions, 0 deletions
diff --git a/drivers/xen/grant-dma-ops.c b/drivers/xen/grant-dma-ops.c
new file mode 100644
index 0000000000..76f6f26265
--- /dev/null
+++ b/drivers/xen/grant-dma-ops.c
@@ -0,0 +1,418 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Xen grant DMA-mapping layer - contains special DMA-mapping routines
+ * for providing grant references as DMA addresses to be used by frontends
+ * (e.g. virtio) in Xen guests
+ *
+ * Copyright (c) 2021, Juergen Gross <jgross@suse.com>
+ */
+
+#include <linux/module.h>
+#include <linux/dma-map-ops.h>
+#include <linux/of.h>
+#include <linux/pci.h>
+#include <linux/pfn.h>
+#include <linux/xarray.h>
+#include <linux/virtio_anchor.h>
+#include <linux/virtio.h>
+#include <xen/xen.h>
+#include <xen/xen-ops.h>
+#include <xen/grant_table.h>
+
+struct xen_grant_dma_data {
+ /* The ID of backend domain */
+ domid_t backend_domid;
+ /* Is device behaving sane? */
+ bool broken;
+};
+
+static DEFINE_XARRAY_FLAGS(xen_grant_dma_devices, XA_FLAGS_LOCK_IRQ);
+
+#define XEN_GRANT_DMA_ADDR_OFF (1ULL << 63)
+
+static inline dma_addr_t grant_to_dma(grant_ref_t grant)
+{
+ return XEN_GRANT_DMA_ADDR_OFF | ((dma_addr_t)grant << XEN_PAGE_SHIFT);
+}
+
+static inline grant_ref_t dma_to_grant(dma_addr_t dma)
+{
+ return (grant_ref_t)((dma & ~XEN_GRANT_DMA_ADDR_OFF) >> XEN_PAGE_SHIFT);
+}
+
+static struct xen_grant_dma_data *find_xen_grant_dma_data(struct device *dev)
+{
+ struct xen_grant_dma_data *data;
+ unsigned long flags;
+
+ xa_lock_irqsave(&xen_grant_dma_devices, flags);
+ data = xa_load(&xen_grant_dma_devices, (unsigned long)dev);
+ xa_unlock_irqrestore(&xen_grant_dma_devices, flags);
+
+ return data;
+}
+
+static int store_xen_grant_dma_data(struct device *dev,
+ struct xen_grant_dma_data *data)
+{
+ unsigned long flags;
+ int ret;
+
+ xa_lock_irqsave(&xen_grant_dma_devices, flags);
+ ret = xa_err(__xa_store(&xen_grant_dma_devices, (unsigned long)dev, data,
+ GFP_ATOMIC));
+ xa_unlock_irqrestore(&xen_grant_dma_devices, flags);
+
+ return ret;
+}
+
+/*
+ * DMA ops for Xen frontends (e.g. virtio).
+ *
+ * Used to act as a kind of software IOMMU for Xen guests by using grants as
+ * DMA addresses.
+ * Such a DMA address is formed by using the grant reference as a frame
+ * number and setting the highest address bit (this bit is for the backend
+ * to be able to distinguish it from e.g. a mmio address).
+ */
+static void *xen_grant_dma_alloc(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t gfp,
+ unsigned long attrs)
+{
+ struct xen_grant_dma_data *data;
+ unsigned int i, n_pages = XEN_PFN_UP(size);
+ unsigned long pfn;
+ grant_ref_t grant;
+ void *ret;
+
+ data = find_xen_grant_dma_data(dev);
+ if (!data)
+ return NULL;
+
+ if (unlikely(data->broken))
+ return NULL;
+
+ ret = alloc_pages_exact(n_pages * XEN_PAGE_SIZE, gfp);
+ if (!ret)
+ return NULL;
+
+ pfn = virt_to_pfn(ret);
+
+ if (gnttab_alloc_grant_reference_seq(n_pages, &grant)) {
+ free_pages_exact(ret, n_pages * XEN_PAGE_SIZE);
+ return NULL;
+ }
+
+ for (i = 0; i < n_pages; i++) {
+ gnttab_grant_foreign_access_ref(grant + i, data->backend_domid,
+ pfn_to_gfn(pfn + i), 0);
+ }
+
+ *dma_handle = grant_to_dma(grant);
+
+ return ret;
+}
+
+static void xen_grant_dma_free(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t dma_handle, unsigned long attrs)
+{
+ struct xen_grant_dma_data *data;
+ unsigned int i, n_pages = XEN_PFN_UP(size);
+ grant_ref_t grant;
+
+ data = find_xen_grant_dma_data(dev);
+ if (!data)
+ return;
+
+ if (unlikely(data->broken))
+ return;
+
+ grant = dma_to_grant(dma_handle);
+
+ for (i = 0; i < n_pages; i++) {
+ if (unlikely(!gnttab_end_foreign_access_ref(grant + i))) {
+ dev_alert(dev, "Grant still in use by backend domain, disabled for further use\n");
+ data->broken = true;
+ return;
+ }
+ }
+
+ gnttab_free_grant_reference_seq(grant, n_pages);
+
+ free_pages_exact(vaddr, n_pages * XEN_PAGE_SIZE);
+}
+
+static struct page *xen_grant_dma_alloc_pages(struct device *dev, size_t size,
+ dma_addr_t *dma_handle,
+ enum dma_data_direction dir,
+ gfp_t gfp)
+{
+ void *vaddr;
+
+ vaddr = xen_grant_dma_alloc(dev, size, dma_handle, gfp, 0);
+ if (!vaddr)
+ return NULL;
+
+ return virt_to_page(vaddr);
+}
+
+static void xen_grant_dma_free_pages(struct device *dev, size_t size,
+ struct page *vaddr, dma_addr_t dma_handle,
+ enum dma_data_direction dir)
+{
+ xen_grant_dma_free(dev, size, page_to_virt(vaddr), dma_handle, 0);
+}
+
+static dma_addr_t xen_grant_dma_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir,
+ unsigned long attrs)
+{
+ struct xen_grant_dma_data *data;
+ unsigned long dma_offset = xen_offset_in_page(offset),
+ pfn_offset = XEN_PFN_DOWN(offset);
+ unsigned int i, n_pages = XEN_PFN_UP(dma_offset + size);
+ grant_ref_t grant;
+ dma_addr_t dma_handle;
+
+ if (WARN_ON(dir == DMA_NONE))
+ return DMA_MAPPING_ERROR;
+
+ data = find_xen_grant_dma_data(dev);
+ if (!data)
+ return DMA_MAPPING_ERROR;
+
+ if (unlikely(data->broken))
+ return DMA_MAPPING_ERROR;
+
+ if (gnttab_alloc_grant_reference_seq(n_pages, &grant))
+ return DMA_MAPPING_ERROR;
+
+ for (i = 0; i < n_pages; i++) {
+ gnttab_grant_foreign_access_ref(grant + i, data->backend_domid,
+ pfn_to_gfn(page_to_xen_pfn(page) + i + pfn_offset),
+ dir == DMA_TO_DEVICE);
+ }
+
+ dma_handle = grant_to_dma(grant) + dma_offset;
+
+ return dma_handle;
+}
+
+static void xen_grant_dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
+ size_t size, enum dma_data_direction dir,
+ unsigned long attrs)
+{
+ struct xen_grant_dma_data *data;
+ unsigned long dma_offset = xen_offset_in_page(dma_handle);
+ unsigned int i, n_pages = XEN_PFN_UP(dma_offset + size);
+ grant_ref_t grant;
+
+ if (WARN_ON(dir == DMA_NONE))
+ return;
+
+ data = find_xen_grant_dma_data(dev);
+ if (!data)
+ return;
+
+ if (unlikely(data->broken))
+ return;
+
+ grant = dma_to_grant(dma_handle);
+
+ for (i = 0; i < n_pages; i++) {
+ if (unlikely(!gnttab_end_foreign_access_ref(grant + i))) {
+ dev_alert(dev, "Grant still in use by backend domain, disabled for further use\n");
+ data->broken = true;
+ return;
+ }
+ }
+
+ gnttab_free_grant_reference_seq(grant, n_pages);
+}
+
+static void xen_grant_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+ int nents, enum dma_data_direction dir,
+ unsigned long attrs)
+{
+ struct scatterlist *s;
+ unsigned int i;
+
+ if (WARN_ON(dir == DMA_NONE))
+ return;
+
+ for_each_sg(sg, s, nents, i)
+ xen_grant_dma_unmap_page(dev, s->dma_address, sg_dma_len(s), dir,
+ attrs);
+}
+
+static int xen_grant_dma_map_sg(struct device *dev, struct scatterlist *sg,
+ int nents, enum dma_data_direction dir,
+ unsigned long attrs)
+{
+ struct scatterlist *s;
+ unsigned int i;
+
+ if (WARN_ON(dir == DMA_NONE))
+ return -EINVAL;
+
+ for_each_sg(sg, s, nents, i) {
+ s->dma_address = xen_grant_dma_map_page(dev, sg_page(s), s->offset,
+ s->length, dir, attrs);
+ if (s->dma_address == DMA_MAPPING_ERROR)
+ goto out;
+
+ sg_dma_len(s) = s->length;
+ }
+
+ return nents;
+
+out:
+ xen_grant_dma_unmap_sg(dev, sg, i, dir, attrs | DMA_ATTR_SKIP_CPU_SYNC);
+ sg_dma_len(sg) = 0;
+
+ return -EIO;
+}
+
+static int xen_grant_dma_supported(struct device *dev, u64 mask)
+{
+ return mask == DMA_BIT_MASK(64);
+}
+
+static const struct dma_map_ops xen_grant_dma_ops = {
+ .alloc = xen_grant_dma_alloc,
+ .free = xen_grant_dma_free,
+ .alloc_pages = xen_grant_dma_alloc_pages,
+ .free_pages = xen_grant_dma_free_pages,
+ .mmap = dma_common_mmap,
+ .get_sgtable = dma_common_get_sgtable,
+ .map_page = xen_grant_dma_map_page,
+ .unmap_page = xen_grant_dma_unmap_page,
+ .map_sg = xen_grant_dma_map_sg,
+ .unmap_sg = xen_grant_dma_unmap_sg,
+ .dma_supported = xen_grant_dma_supported,
+};
+
+static struct device_node *xen_dt_get_node(struct device *dev)
+{
+ if (dev_is_pci(dev)) {
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct pci_bus *bus = pdev->bus;
+
+ /* Walk up to the root bus to look for PCI Host controller */
+ while (!pci_is_root_bus(bus))
+ bus = bus->parent;
+
+ if (!bus->bridge->parent)
+ return NULL;
+ return of_node_get(bus->bridge->parent->of_node);
+ }
+
+ return of_node_get(dev->of_node);
+}
+
+static int xen_dt_grant_init_backend_domid(struct device *dev,
+ struct device_node *np,
+ domid_t *backend_domid)
+{
+ struct of_phandle_args iommu_spec = { .args_count = 1 };
+
+ if (dev_is_pci(dev)) {
+ struct pci_dev *pdev = to_pci_dev(dev);
+ u32 rid = PCI_DEVID(pdev->bus->number, pdev->devfn);
+
+ if (of_map_id(np, rid, "iommu-map", "iommu-map-mask", &iommu_spec.np,
+ iommu_spec.args)) {
+ dev_dbg(dev, "Cannot translate ID\n");
+ return -ESRCH;
+ }
+ } else {
+ if (of_parse_phandle_with_args(np, "iommus", "#iommu-cells",
+ 0, &iommu_spec)) {
+ dev_dbg(dev, "Cannot parse iommus property\n");
+ return -ESRCH;
+ }
+ }
+
+ if (!of_device_is_compatible(iommu_spec.np, "xen,grant-dma") ||
+ iommu_spec.args_count != 1) {
+ dev_dbg(dev, "Incompatible IOMMU node\n");
+ of_node_put(iommu_spec.np);
+ return -ESRCH;
+ }
+
+ of_node_put(iommu_spec.np);
+
+ /*
+ * The endpoint ID here means the ID of the domain where the
+ * corresponding backend is running
+ */
+ *backend_domid = iommu_spec.args[0];
+
+ return 0;
+}
+
+static int xen_grant_init_backend_domid(struct device *dev,
+ domid_t *backend_domid)
+{
+ struct device_node *np;
+ int ret = -ENODEV;
+
+ np = xen_dt_get_node(dev);
+ if (np) {
+ ret = xen_dt_grant_init_backend_domid(dev, np, backend_domid);
+ of_node_put(np);
+ } else if (IS_ENABLED(CONFIG_XEN_VIRTIO_FORCE_GRANT) || xen_pv_domain()) {
+ dev_info(dev, "Using dom0 as backend\n");
+ *backend_domid = 0;
+ ret = 0;
+ }
+
+ return ret;
+}
+
+static void xen_grant_setup_dma_ops(struct device *dev, domid_t backend_domid)
+{
+ struct xen_grant_dma_data *data;
+
+ data = find_xen_grant_dma_data(dev);
+ if (data) {
+ dev_err(dev, "Xen grant DMA data is already created\n");
+ return;
+ }
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ goto err;
+
+ data->backend_domid = backend_domid;
+
+ if (store_xen_grant_dma_data(dev, data)) {
+ dev_err(dev, "Cannot store Xen grant DMA data\n");
+ goto err;
+ }
+
+ dev->dma_ops = &xen_grant_dma_ops;
+
+ return;
+
+err:
+ devm_kfree(dev, data);
+ dev_err(dev, "Cannot set up Xen grant DMA ops, retain platform DMA ops\n");
+}
+
+bool xen_virtio_restricted_mem_acc(struct virtio_device *dev)
+{
+ domid_t backend_domid;
+
+ if (!xen_grant_init_backend_domid(dev->dev.parent, &backend_domid)) {
+ xen_grant_setup_dma_ops(dev->dev.parent, backend_domid);
+ return true;
+ }
+
+ return false;
+}
+
+MODULE_DESCRIPTION("Xen grant DMA-mapping layer");
+MODULE_AUTHOR("Juergen Gross <jgross@suse.com>");
+MODULE_LICENSE("GPL");