[libvirt] [PATCH v4 08/10] Add iommu info for pci on mocked sysfs
Shivaprasad G Bhat
sbhat at linux.vnet.ibm.com
Sat Nov 14 08:38:11 UTC 2015
The iommu group info can be used to check if the devices are bound/unbound
from vfio at the group level granualrity. Add the info to mock as to help
add test cases later.
Signed-off-by: Shivaprasad G Bhat <sbhat at linux.vnet.ibm.com>
---
tests/virpcimock.c | 180 +++++++++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 164 insertions(+), 16 deletions(-)
diff --git a/tests/virpcimock.c b/tests/virpcimock.c
index 0724a36..837976a 100644
--- a/tests/virpcimock.c
+++ b/tests/virpcimock.c
@@ -127,9 +127,15 @@ struct pciDevice {
int vendor;
int device;
int class;
+ int iommu;
struct pciDriver *driver; /* Driver attached. NULL if attached to no driver */
};
+struct pciIommuGroup {
+ int iommu;
+ size_t nDevicesBoundToVFIO; /* Indicates the devices in the group */
+};
+
struct fdCallback {
int fd;
char *path;
@@ -141,6 +147,9 @@ size_t nPCIDevices = 0;
struct pciDriver **pciDrivers = NULL;
size_t nPCIDrivers = 0;
+struct pciIommuGroup **pciIommuGroups = NULL;
+size_t npciIommuGroups = 0;
+
struct fdCallback *callbacks = NULL;
size_t nCallbacks = 0;
@@ -325,6 +334,7 @@ pci_device_new_from_stub(const struct pciDevice *data)
char *configSrc;
char tmp[32];
struct stat sb;
+ char *iommugrouppath, *deviommupath, *iommugroupdevs = NULL;
if (VIR_STRDUP_QUIET(id, data->id) < 0)
ABORT_OOM();
@@ -387,6 +397,25 @@ pci_device_new_from_stub(const struct pciDevice *data)
ABORT("@tmp overflow");
make_file(devpath, "class", tmp, -1);
+ if (virAsprintfQuiet(&deviommupath, "%s/iommu_group", devpath) < 0 ||
+ virAsprintfQuiet(&iommugrouppath, "%s/iommu_groups/%d",
+ fakesysfsdir, dev->iommu) < 0)
+ ABORT("@deviommupath overflow");
+
+ if (symlink(iommugrouppath, deviommupath) < 0)
+ ABORT("Unable to link device to iommu group");
+
+ VIR_FREE(deviommupath);
+ if (virAsprintfQuiet(&iommugroupdevs, "%s/devices/%s",
+ iommugrouppath, dev->id) < 0)
+ ABORT("@iommugroupdevs overflow");
+
+ if (symlink(devpath, iommugroupdevs) < 0)
+ ABORT("Unable to link iommu group devices to current device");
+
+ VIR_FREE(iommugrouppath);
+ VIR_FREE(iommugroupdevs);
+
if (pci_device_autobind(dev) < 0)
ABORT("Unable to bind: %s", data->id);
@@ -435,7 +464,95 @@ pci_device_autobind(struct pciDevice *dev)
return pci_driver_bind(driver, dev);
}
+static void
+pci_iommu_new(int num)
+{
+ char *iommupath;
+ struct pciIommuGroup *iommuGroup;
+
+ if (VIR_ALLOC_QUIET(iommuGroup) < 0)
+ ABORT_OOM();
+
+ iommuGroup->iommu = num;
+ iommuGroup->nDevicesBoundToVFIO = 0; /* No device bound to vfio by default */
+
+ if (virAsprintfQuiet(&iommupath, "%s/iommu_groups/%d/devices", fakesysfsdir, num) < 0)
+ ABORT_OOM();
+
+ if (virFileMakePath(iommupath) < 0)
+ ABORT("Unable to create: %s", iommupath);
+
+ if (VIR_APPEND_ELEMENT_QUIET(pciIommuGroups, npciIommuGroups, iommuGroup) < 0)
+ ABORT_OOM();
+}
+
+static int
+pci_vfio_release_iommu(struct pciDevice *device)
+{
+ char *vfiopath = NULL;
+ int ret = -1;
+ size_t i = 0;
+
+ for (i = 0; i < npciIommuGroups; i++) {
+ if (pciIommuGroups[i]->iommu == device->iommu)
+ break;
+ }
+
+ if (i != npciIommuGroups) {
+ if (pciIommuGroups[i]->nDevicesBoundToVFIO == 0) {
+ ret = 0;
+ goto cleanup;
+ }
+ pciIommuGroups[i]->nDevicesBoundToVFIO--;
+ if (!pciIommuGroups[i]->nDevicesBoundToVFIO) {
+ if (virAsprintfQuiet(&vfiopath, "%s/dev/vfio/%d",
+ fakesysfsdir, device->iommu) < 0) {
+ errno = ENOMEM;
+ goto cleanup;
+ }
+ if (unlink(vfiopath) < 0)
+ goto cleanup;
+ }
+ }
+
+ ret = 0;
+ cleanup:
+ VIR_FREE(vfiopath);
+ return ret;
+}
+
+static int
+pci_vfio_lock_iommu(struct pciDevice *device)
+{
+ char *vfiopath = NULL;
+ int ret = -1;
+ size_t i = 0;
+ int fd = -1;
+
+ for (i = 0; i < npciIommuGroups; i++) {
+ if (pciIommuGroups[i]->iommu == device->iommu)
+ break;
+ }
+ if (i != npciIommuGroups) {
+ if (!pciIommuGroups[i]->nDevicesBoundToVFIO) {
+ if (virAsprintfQuiet(&vfiopath, "%s/dev/vfio/%d",
+ fakesysfsdir, device->iommu) < 0) {
+ errno = ENOMEM;
+ goto cleanup;
+ }
+ if ((fd = realopen(vfiopath, O_CREAT)) < 0)
+ goto cleanup;
+ }
+ pciIommuGroups[i]->nDevicesBoundToVFIO++;
+ }
+
+ ret = 0;
+ cleanup:
+ realclose(fd);
+ VIR_FREE(vfiopath);
+ return ret;
+}
/*
* PCI Driver functions
*/
@@ -556,6 +673,10 @@ pci_driver_bind(struct pciDriver *driver,
if (symlink(devpath, driverpath) < 0)
goto cleanup;
+ if (STREQ(driver->name, "vfio-pci"))
+ if (pci_vfio_lock_iommu(dev) < 0)
+ goto cleanup;
+
dev->driver = driver;
ret = 0;
cleanup:
@@ -590,6 +711,10 @@ pci_driver_unbind(struct pciDriver *driver,
unlink(driverpath) < 0)
goto cleanup;
+ if (STREQ(driver->name, "vfio-pci"))
+ if (pci_vfio_release_iommu(dev) < 0)
+ goto cleanup;
+
dev->driver = NULL;
ret = 0;
cleanup:
@@ -801,6 +926,8 @@ init_syms(void)
static void
init_env(void)
{
+ char *devvfio;
+
if (fakesysfsdir)
return;
@@ -809,12 +936,33 @@ init_env(void)
make_file(fakesysfsdir, "drivers_probe", NULL, -1);
+ if (virAsprintfQuiet(&devvfio, "%s/dev/vfio", fakesysfsdir) < 0)
+ ABORT_OOM();
+
+ if (virFileMakePath(devvfio) < 0)
+ ABORT("Unable to create: %s", devvfio);
+ VIR_FREE(devvfio);
+
+ pci_iommu_new(1);
+ pci_iommu_new(2);
+ pci_iommu_new(3);
+ pci_iommu_new(4);
+ pci_iommu_new(5);
+ pci_iommu_new(6);
+ pci_iommu_new(7);
+ pci_iommu_new(8);
+ pci_iommu_new(9);
+ pci_iommu_new(10);
+ pci_iommu_new(11);
+
+
# define MAKE_PCI_DRIVER(name, ...) \
pci_driver_new(name, 0, __VA_ARGS__, -1, -1)
- MAKE_PCI_DRIVER("iwlwifi", 0x8086, 0x0044);
- MAKE_PCI_DRIVER("i915", 0x8086, 0x0046, 0x8086, 0x0047);
+ MAKE_PCI_DRIVER("i915", 0x8086, 0x0046, 0x8086, 0x0047, 0x8086, 0x0048, 0x1033, 0x0035, 0x1033, 0x00e0);
+ MAKE_PCI_DRIVER("iwlwifi", 0x8086, 0x0044, 0x0086, 0x105e, 0x0086, 0x105d);
MAKE_PCI_DRIVER("pci-stub", -1, -1);
+ MAKE_PCI_DRIVER("vfio-pci", -1, -1);
pci_driver_new("pciback", PCI_ACTION_BIND, -1, -1);
# define MAKE_PCI_DEVICE(Id, Vendor, Device, ...) \
@@ -824,20 +972,20 @@ init_env(void)
pci_device_new_from_stub(&dev); \
} while (0)
- MAKE_PCI_DEVICE("0000:00:00.0", 0x8086, 0x0044);
- MAKE_PCI_DEVICE("0000:00:01.0", 0x8086, 0x0044);
- MAKE_PCI_DEVICE("0000:00:02.0", 0x8086, 0x0046);
- MAKE_PCI_DEVICE("0000:00:03.0", 0x8086, 0x0048);
- MAKE_PCI_DEVICE("0001:00:00.0", 0x1014, 0x03b9, .class = 0x060400);
- MAKE_PCI_DEVICE("0001:01:00.0", 0x8086, 0x105e);
- MAKE_PCI_DEVICE("0001:01:00.1", 0x8086, 0x105e);
- MAKE_PCI_DEVICE("0005:80:00.0", 0x10b5, 0x8112, .class = 0x060400);
- MAKE_PCI_DEVICE("0005:90:01.0", 0x1033, 0x0035);
- MAKE_PCI_DEVICE("0005:90:01.1", 0x1033, 0x0035);
- MAKE_PCI_DEVICE("0005:90:01.2", 0x1033, 0x00e0);
- MAKE_PCI_DEVICE("0000:0a:01.0", 0x8086, 0x0047);
- MAKE_PCI_DEVICE("0000:0a:02.0", 0x8286, 0x0048);
- MAKE_PCI_DEVICE("0000:0a:03.0", 0x8386, 0x0048);
+ MAKE_PCI_DEVICE("0000:00:00.0", 0x8086, 0x0044, .iommu = 1);
+ MAKE_PCI_DEVICE("0000:00:01.0", 0x8086, 0x0044, .iommu = 2);
+ MAKE_PCI_DEVICE("0000:00:02.0", 0x8086, 0x0046, .iommu = 3);
+ MAKE_PCI_DEVICE("0000:00:03.0", 0x8086, 0x0048, .iommu = 4);
+ MAKE_PCI_DEVICE("0001:00:00.0", 0x1014, 0x03b9, .iommu = 5, .class = 0x060400);
+ MAKE_PCI_DEVICE("0001:01:00.0", 0x8086, 0x105e, .iommu = 6);
+ MAKE_PCI_DEVICE("0001:01:00.1", 0x8086, 0x105d, .iommu = 6);
+ MAKE_PCI_DEVICE("0005:80:00.0", 0x10b5, 0x8112, .iommu = 7, .class = 0x060400);
+ MAKE_PCI_DEVICE("0005:90:01.0", 0x1033, 0x0035, .iommu = 8);
+ MAKE_PCI_DEVICE("0005:90:01.1", 0x1033, 0x0035, .iommu = 8);
+ MAKE_PCI_DEVICE("0005:90:01.2", 0x1033, 0x00e0, .iommu = 8);
+ MAKE_PCI_DEVICE("0000:0a:01.0", 0x8086, 0x0047, .iommu = 9);
+ MAKE_PCI_DEVICE("0000:0a:02.0", 0x8286, 0x0048, .iommu = 10);
+ MAKE_PCI_DEVICE("0000:0a:03.0", 0x8386, 0x0048, .iommu = 11);
}
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