These functions will handle PCIe devices and their link capabilities
to query some info about it.
Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
---
src/libvirt_private.syms | 3 ++
src/util/virpci.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++-
src/util/virpci.h | 8 ++++
3 files changed, 106 insertions(+), 1 deletion(-)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 122c572..29a9ed1 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1697,6 +1697,7 @@ virPCIDeviceFree;
virPCIDeviceGetDriverPathAndName;
virPCIDeviceGetIOMMUGroupDev;
virPCIDeviceGetIOMMUGroupList;
+virPCIDeviceGetLinkCapSta;
virPCIDeviceGetManaged;
virPCIDeviceGetName;
virPCIDeviceGetRemoveSlot;
@@ -1704,7 +1705,9 @@ virPCIDeviceGetReprobe;
virPCIDeviceGetStubDriver;
virPCIDeviceGetUnbindFromStub;
virPCIDeviceGetUsedBy;
+virPCIDeviceHasPCIExpressLink;
virPCIDeviceIsAssignable;
+virPCIDeviceIsPCIExpress;
virPCIDeviceListAdd;
virPCIDeviceListAddCopy;
virPCIDeviceListCount;
diff --git a/src/util/virpci.c b/src/util/virpci.c
index e0f2344..6f4f6af 100644
--- a/src/util/virpci.c
+++ b/src/util/virpci.c
@@ -120,6 +120,7 @@ struct _virPCIDeviceList {
/* PCI30 6.7 Capabilities List */
#define PCI_CAPABILITY_LIST 0x34 /* Offset of first capability list entry */
+#define PCI_CAP_FLAGS 2 /* Capability defined flags (16 bits) */
/* PM12 3.2.1 Capability Identifier */
#define PCI_CAP_ID_PM 0x01 /* Power Management */
@@ -130,7 +131,13 @@ struct _virPCIDeviceList {
/* PCIe20 7.8.3 Device Capabilities Register (Offset 04h) */
#define PCI_EXP_DEVCAP 0x4 /* Device capabilities */
-#define PCI_EXP_DEVCAP_FLR (1<<28) /* Function Level Reset */
+#define PCI_EXP_DEVCAP_FLR (1<<28) /* Function Level Reset */
+#define PCI_EXP_LNKCAP 0xc /* Link Capabilities */
+#define PCI_EXP_LNKCAP_SPEED 0x0000f /* Maximum Link Speed */
+#define PCI_EXP_LNKCAP_WIDTH 0x003f0 /* Maximum Link Width */
+#define PCI_EXP_LNKSTA 0x12 /* Link Status */
+#define PCI_EXP_LNKSTA_SPEED 0x000f /* Negotiated Link Speed */
+#define PCI_EXP_LNKSTA_WIDTH 0x03f0 /* Negotiated Link Width */
/* Header type 1 BR12 3.2 PCI-to-PCI Bridge Configuration Space Header Format */
#define PCI_PRIMARY_BUS 0x18 /* BR12 3.2.5.2 Primary bus number */
@@ -173,6 +180,9 @@ struct _virPCIDeviceList {
PCI_EXT_CAP_ACS_CR | \
PCI_EXT_CAP_ACS_UF)
+#define PCI_EXP_TYPE_ROOT_INT_EP 0x9 /* Root Complex Integrated Endpoint */
+#define PCI_EXP_TYPE_ROOT_EC 0xa /* Root Complex Event Collector */
+
static virClassPtr virPCIDeviceListClass;
static void virPCIDeviceListDispose(void *obj);
@@ -2750,3 +2760,87 @@ virPCIGetVirtualFunctionInfo(const char *vf_sysfs_device_path ATTRIBUTE_UNUSED,
return -1;
}
#endif /* __linux__ */
+
+int
+virPCIDeviceIsPCIExpress(virPCIDevicePtr dev)
+{
+ int fd;
+ int ret = -1;
+
+ if ((fd = virPCIDeviceConfigOpen(dev, true)) < 0)
+ return ret;
+
+ if (virPCIDeviceInit(dev, fd) < 0)
+ goto cleanup;
+
+ ret = dev->pcie_cap_pos != 0;
+
+ cleanup:
+ virPCIDeviceConfigClose(dev, fd);
+ return ret;
+}
+
+int
+virPCIDeviceHasPCIExpressLink(virPCIDevicePtr dev)
+{
+ int fd;
+ int ret = -1;
+ uint16_t cap, type;
+
+ if ((fd = virPCIDeviceConfigOpen(dev, true)) < 0)
+ return ret;
+
+ if (virPCIDeviceInit(dev, fd) < 0)
+ goto cleanup;
+
+ cap = virPCIDeviceRead16(dev, fd, dev->pcie_cap_pos + PCI_CAP_FLAGS);
+ type = (cap & PCI_EXP_FLAGS_TYPE) >> 4;
+
+ ret = type != PCI_EXP_TYPE_ROOT_INT_EP && type != PCI_EXP_TYPE_ROOT_EC;
+
+ cleanup:
+ virPCIDeviceConfigClose(dev, fd);
+ return ret;
+}
+
+int
+virPCIDeviceGetLinkCapSta(virPCIDevicePtr dev,
+ int *cap_port,
+ unsigned int *cap_speed,
+ unsigned int *cap_width,
+ unsigned int *sta_speed,
+ unsigned int *sta_width)
+{
+ uint32_t t;
+ int fd;
+ int ret = -1;
+
+ if ((fd = virPCIDeviceConfigOpen(dev, true)) < 0)
+ return ret;
+
+ if (virPCIDeviceInit(dev, fd) < 0)
+ goto cleanup;
+
+ if (!dev->pcie_cap_pos) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("pci device %s is not a PCI-Express device"),
+ dev->name);
+ goto cleanup;
+ }
+
+ t = virPCIDeviceRead32(dev, fd, dev->pcie_cap_pos + PCI_EXP_LNKCAP);
+
+ *cap_port = t >> 24;
+ *cap_speed = t & PCI_EXP_LNKCAP_SPEED;
+ *cap_width = (t & PCI_EXP_LNKCAP_WIDTH) >> 4;
+
+ t = virPCIDeviceRead16(dev, fd, dev->pcie_cap_pos + PCI_EXP_LNKSTA);
+
+ *sta_speed = t & PCI_EXP_LNKSTA_SPEED;
+ *sta_width = (t & PCI_EXP_LNKSTA_WIDTH) >> 4;
+ ret = 0;
+
+ cleanup:
+ virPCIDeviceConfigClose(dev, fd);
+ return ret;
+}
diff --git a/src/util/virpci.h b/src/util/virpci.h
index 20ffe54..d64c3e2 100644
--- a/src/util/virpci.h
+++ b/src/util/virpci.h
@@ -176,4 +176,12 @@ int virPCIDeviceGetDriverPathAndName(virPCIDevicePtr dev,
char **path,
char **name);
+int virPCIDeviceIsPCIExpress(virPCIDevicePtr dev);
+int virPCIDeviceHasPCIExpressLink(virPCIDevicePtr dev);
+int virPCIDeviceGetLinkCapSta(virPCIDevicePtr dev,
+ int *ca_port,
+ unsigned int *cap_speed,
+ unsigned int *cap_width,
+ unsigned int *sta_speed,
+ unsigned int *sta_width);
#endif /* __VIR_PCI_H__ */
--
1.8.5.5
--
libvir-list mailing list
libvir-list@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/libvir-list