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authorOleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>2022-10-25 19:20:04 +0300
committerJuergen Gross <jgross@suse.com>2022-12-05 14:59:49 +0300
commitef8ae384b4c9ccefecf4754f34644bd9fb0105b7 (patch)
tree600d4e8c4aff4670482177e63077d43834c09d7a /drivers/xen
parent035e3a4321f73c352b6408ec2153fa5bc3feb459 (diff)
downloadlinux-ef8ae384b4c9ccefecf4754f34644bd9fb0105b7.tar.xz
xen/virtio: Handle PCI devices which Host controller is described in DT
Use the same "xen-grant-dma" device concept for the PCI devices behind device-tree based PCI Host controller, but with one modification. Unlike for platform devices, we cannot use generic IOMMU bindings (iommus property), as we need to support more flexible configuration. The problem is that PCI devices under the single PCI Host controller may have the backends running in different Xen domains and thus have different endpoints ID (backend domains ID). Add ability to deal with generic PCI-IOMMU bindings (iommu-map/ iommu-map-mask properties) which allows us to describe relationship between PCI devices and backend domains ID properly. To avoid having to look up for the PCI Host bridge twice and reduce the amount of checks pass an extra struct device_node *np to xen_dt_grant_init_backend_domid(). So with current patch the code expects iommus property for the platform devices and iommu-map/iommu-map-mask properties for PCI devices. The example of generated by the toolstack iommu-map property for two PCI devices 0000:00:01.0 and 0000:00:02.0 whose backends are running in different Xen domains with IDs 1 and 2 respectively: iommu-map = <0x08 0xfde9 0x01 0x08 0x10 0xfde9 0x02 0x08>; Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> Reviewed-by: Xenia Ragiadakou <burzalodowa@gmail.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> Link: https://lore.kernel.org/r/20221025162004.8501-3-olekstysh@gmail.com Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/grant-dma-ops.c46
1 files changed, 39 insertions, 7 deletions
diff --git a/drivers/xen/grant-dma-ops.c b/drivers/xen/grant-dma-ops.c
index 1e797a043980..9784a77fa3c9 100644
--- a/drivers/xen/grant-dma-ops.c
+++ b/drivers/xen/grant-dma-ops.c
@@ -10,6 +10,7 @@
#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>
@@ -292,15 +293,43 @@ static const struct dma_map_ops xen_grant_dma_ops = {
.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;
+
+ 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;
+ struct of_phandle_args iommu_spec = { .args_count = 1 };
- if (of_parse_phandle_with_args(dev->of_node, "iommus", "#iommu-cells",
- 0, &iommu_spec)) {
- dev_dbg(dev, "Cannot parse iommus property\n");
- return -ESRCH;
+ 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") ||
@@ -324,10 +353,13 @@ static int xen_dt_grant_init_backend_domid(struct device *dev,
static int xen_grant_init_backend_domid(struct device *dev,
domid_t *backend_domid)
{
+ struct device_node *np;
int ret = -ENODEV;
- if (dev->of_node) {
- ret = xen_dt_grant_init_backend_domid(dev, backend_domid);
+ 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;