PCI: handle Virtual Function ATS enabling
The SR-IOV spec requires that the Smallest Translation Unit and
the Invalidate Queue Depth fields in the Virtual Function ATS
capability are hardwired to 0. If a function is a Virtual Function,
then and set its Physical Function's STU before enabling the ATS.
Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 3c2ec64..f73bcbe 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -234,6 +234,8 @@
int pos; /* capability position */
int stu; /* Smallest Translation Unit */
int qdep; /* Invalidate Queue Depth */
+ int ref_cnt; /* Physical Function reference count */
+ int is_enabled:1; /* Enable bit is set */
};
#ifdef CONFIG_PCI_IOV
@@ -255,7 +257,7 @@
*/
static inline int pci_ats_enabled(struct pci_dev *dev)
{
- return !!dev->ats;
+ return dev->ats && dev->ats->is_enabled;
}
#else
static inline int pci_iov_init(struct pci_dev *dev)
