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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH]: xl: pci multi-function passthrough v2
Changes since last time:
1. Incorporate Stefanos feedback wrt. coding style, commenting
non-obvious code and making single-function a special-case of
multi-function
2. Also fix the case for passing through a single sub-function and
re-mapping it as a single-function virtual device. (ie: pfunc =
non-zero, vfunc = zero). Apparently needed for SR-IOV.
3. One-liner format change in xl pci-list-assignable to make it
print a copy-and-pasteable BDF.
8<----------------------------------------
Implement PCI pass-through for multi-function devices. The supported BDF
notation is: BB:DD.* - therefore passing-through a subset of functions or
remapping the function numbers is not supported except for when passing
through a single function which will be a virtual function 0.
Letting qemu automatically select the virtual slot is not supported in
multi-function passthrough since the qemu-dm protocol can not actually
handle that case.
Also fix format error in xl pci-list-assignable.
Signed-off-by: Gianni Tedesco <gianni.tedesco@xxxxxxxxxx>
diff -r 8992134dcfd0 tools/libxl/libxl.h
--- a/tools/libxl/libxl.h Wed Aug 04 19:24:17 2010 +0100
+++ b/tools/libxl/libxl.h Mon Aug 09 12:58:00 2010 +0100
@@ -310,6 +310,8 @@ typedef struct {
};
unsigned int domain;
unsigned int vdevfn;
+#define LIBXL_PCI_FUNC_ALL (~0U)
+ unsigned int vfunc_mask;
bool msitranslate;
bool power_mgmt;
} libxl_device_pci;
diff -r 8992134dcfd0 tools/libxl/libxl_pci.c
--- a/tools/libxl/libxl_pci.c Wed Aug 04 19:24:17 2010 +0100
+++ b/tools/libxl/libxl_pci.c Mon Aug 09 12:58:00 2010 +0100
@@ -136,8 +136,13 @@ int libxl_device_pci_parse_bdf(libxl_ctx
break;
}
*ptr = '\0';
- if ( hex_convert(tok, &func, 0x7) )
- goto parse_error;
+ if ( !strcmp(tok, "*") ) {
+ pcidev->vfunc_mask = LIBXL_PCI_FUNC_ALL;
+ }else{
+ if ( hex_convert(tok, &func, 0x7) )
+ goto parse_error;
+ pcidev->vfunc_mask = (1 << 0);
+ }
tok = ptr + 1;
}
break;
@@ -187,7 +192,6 @@ int libxl_device_pci_parse_bdf(libxl_ctx
return 0;
parse_error:
- printf("parse error: %s\n", str);
return ERROR_INVAL;
}
@@ -531,6 +535,55 @@ int libxl_device_pci_list_assignable(lib
return 0;
}
+/*
+ * This function checks that all functions of a device are bound to pciback
+ * driver. It also initialises a bit-mask of which function numbers are present
+ * on that device.
+*/
+static int pci_multifunction_check(libxl_ctx *ctx, libxl_device_pci *pcidev,
unsigned int *func_mask)
+{
+ struct dirent *de;
+ DIR *dir;
+
+ *func_mask = 0;
+
+ dir = opendir(SYSFS_PCI_DEV);
+ if ( NULL == dir ) {
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "Couldn't open %s", SYSFS_PCI_DEV);
+ return -1;
+ }
+
+ while( (de = readdir(dir)) ) {
+ unsigned dom, bus, dev, func;
+ struct stat st;
+ char *path;
+
+ if ( sscanf(de->d_name, PCI_BDF, &dom, &bus, &dev, &func) != 4 )
+ continue;
+ if ( pcidev->domain != dom )
+ continue;
+ if ( pcidev->bus != bus )
+ continue;
+ if ( pcidev->dev != dev )
+ continue;
+
+ path = libxl_sprintf(ctx, "%s/" PCI_BDF, SYSFS_PCIBACK_DRIVER, dom,
bus, dev, func);
+ if ( lstat(path, &st) ) {
+ if ( errno == ENOENT )
+ XL_LOG(ctx, XL_LOG_ERROR, PCI_BDF " is not assigned to pciback
driver",
+ dom, bus, dev, func);
+ else
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "Couldn't lstat %s", path);
+ closedir(dir);
+ return -1;
+ }
+ (*func_mask) |= (1 << func);
+ }
+
+ closedir(dir);
+ return 0;
+}
+
static int pci_ins_check(libxl_ctx *ctx, uint32_t domid, const char *state,
void *priv)
{
char *orig_state = priv;
@@ -652,8 +705,9 @@ out:
int libxl_device_pci_add(libxl_ctx *ctx, uint32_t domid, libxl_device_pci
*pcidev)
{
+ unsigned int orig_vdev, pfunc_mask;
libxl_device_pci *assigned;
- int num_assigned, rc;
+ int num_assigned, rc, i;
int stubdomid = 0;
rc = get_all_assigned_devices(ctx, &assigned, &num_assigned);
@@ -679,10 +733,43 @@ int libxl_device_pci_add(libxl_ctx *ctx,
return rc;
}
- return do_pci_add(ctx, domid, pcidev);
+ orig_vdev = pcidev->vdevfn & ~7U;
+
+ if ( pcidev->vfunc_mask == LIBXL_PCI_FUNC_ALL ) {
+ if ( !(pcidev->vdevfn >> 3) ) {
+ XL_LOG(ctx, XL_LOG_ERROR, "Must specify a v-slot for
multi-function devices");
+ return ERROR_INVAL;
+ }
+ if ( pci_multifunction_check(ctx, pcidev, &pfunc_mask) ) {
+ return ERROR_FAIL;
+ }
+ pcidev->vfunc_mask &= pfunc_mask;
+ /* so now vfunc_mask == pfunc_mask */
+ }else{
+ pfunc_mask = (1 << pcidev->func);
+ }
+
+ for(i = 7; i >= 0; --i) {
+ if ( (1 << i) & pfunc_mask ) {
+ if ( pcidev->vfunc_mask == pfunc_mask ) {
+ pcidev->func = i;
+ pcidev->vdevfn = orig_vdev | i;
+ }else{
+ /* if not passing through multiple devices in a block make
+ * sure that virtual function number 0 is always used otherwise
+ * guest won't see the device
+ */
+ pcidev->vdevfn = orig_vdev;
+ }
+ if ( do_pci_add(ctx, domid, pcidev) )
+ rc = ERROR_FAIL;
+ }
+ }
+
+ return rc;
}
-int libxl_device_pci_remove(libxl_ctx *ctx, uint32_t domid, libxl_device_pci
*pcidev)
+static int do_pci_remove(libxl_ctx *ctx, uint32_t domid, libxl_device_pci
*pcidev)
{
libxl_device_pci *assigned;
char *path;
@@ -711,10 +798,15 @@ int libxl_device_pci_remove(libxl_ctx *c
libxl_xs_write(ctx, XBT_NULL, path, PCI_BDF, pcidev->domain,
pcidev->bus, pcidev->dev, pcidev->func);
path = libxl_sprintf(ctx, "/local/domain/0/device-model/%d/command",
domid);
- xs_write(ctx->xsh, XBT_NULL, path, "pci-rem", strlen("pci-rem"));
- if (libxl_wait_for_device_model(ctx, domid, "pci-removed", NULL, NULL)
< 0) {
- XL_LOG(ctx, XL_LOG_ERROR, "Device Model didn't respond in time");
- return ERROR_FAIL;
+
+ /* Remove all functions at once atomically by only signalling
+ * device-model for function 0 */
+ if ( (pcidev->vdevfn & 0x7) == 0 ) {
+ xs_write(ctx->xsh, XBT_NULL, path, "pci-rem", strlen("pci-rem"));
+ if (libxl_wait_for_device_model(ctx, domid, "pci-removed", NULL,
NULL) < 0) {
+ XL_LOG(ctx, XL_LOG_ERROR, "Device Model didn't respond in
time");
+ return ERROR_FAIL;
+ }
}
path = libxl_sprintf(ctx, "/local/domain/0/device-model/%d/state",
domid);
xs_write(ctx->xsh, XBT_NULL, path, state, strlen(state));
@@ -769,7 +861,10 @@ skip1:
fclose(f);
}
out:
- libxl_device_pci_reset(ctx, pcidev->domain, pcidev->bus, pcidev->dev,
pcidev->func);
+ /* don't do multiple resets while some functions are still passed through
*/
+ if ( (pcidev->vdevfn & 0x7) == 0 ) {
+ libxl_device_pci_reset(ctx, pcidev->domain, pcidev->bus, pcidev->dev,
pcidev->func);
+ }
if (!libxl_is_stubdom(ctx, domid, NULL)) {
rc = xc_deassign_device(ctx->xch, domid, pcidev->value);
@@ -786,6 +881,38 @@ out:
return 0;
}
+int libxl_device_pci_remove(libxl_ctx *ctx, uint32_t domid, libxl_device_pci
*pcidev)
+{
+ unsigned int orig_vdev, pfunc_mask;
+ int i, rc;
+
+ orig_vdev = pcidev->vdevfn & ~7U;
+
+ if ( pcidev->vfunc_mask == LIBXL_PCI_FUNC_ALL ) {
+ if ( pci_multifunction_check(ctx, pcidev, &pfunc_mask) ) {
+ return ERROR_FAIL;
+ }
+ pcidev->vfunc_mask &= pfunc_mask;
+ }else{
+ pfunc_mask = (1 << pcidev->func);
+ }
+
+ for(i = 7; i >= 0; --i) {
+ if ( (1 << i) & pfunc_mask ) {
+ if ( pcidev->vfunc_mask == pfunc_mask ) {
+ pcidev->func = i;
+ pcidev->vdevfn = orig_vdev | i;
+ }else{
+ pcidev->vdevfn = orig_vdev;
+ }
+ if ( do_pci_remove(ctx, domid, pcidev) )
+ rc = ERROR_FAIL;
+ }
+ }
+
+ return rc;
+}
+
int libxl_device_pci_list_assigned(libxl_ctx *ctx, libxl_device_pci **list,
uint32_t domid, int *num)
{
char *be_path, *num_devs, *xsdev, *xsvdevfn, *xsopts;
diff -r 8992134dcfd0 tools/libxl/xl_cmdimpl.c
--- a/tools/libxl/xl_cmdimpl.c Wed Aug 04 19:24:17 2010 +0100
+++ b/tools/libxl/xl_cmdimpl.c Mon Aug 09 12:58:00 2010 +0100
@@ -1923,7 +1923,7 @@ void pcilist_assignable(void)
if ( libxl_device_pci_list_assignable(&ctx, &pcidevs, &num) )
return;
for (i = 0; i < num; i++) {
- printf("%04x:%02x:%02x:%01x\n",
+ printf("%04x:%02x:%02x.%01x\n",
pcidevs[i].domain, pcidevs[i].bus, pcidevs[i].dev,
pcidevs[i].func);
}
free(pcidevs);
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