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authorBjorn Helgaas <bhelgaas@google.com>2018-10-20 11:45:35 -0500
committerBjorn Helgaas <bhelgaas@google.com>2018-10-20 11:45:35 -0500
commiteff81b6f7b1ecad7e8cdf4f44b010b54ef438864 (patch)
tree6231f738f74be610a1c649baf96f87a694436449 /drivers/pci
parent1734715493e010d034ae8d65c9a228ee7ad24a08 (diff)
parent4c243716e77d4f54e37834757ee5067e56099219 (diff)
downloadlinux-eff81b6f7b1ecad7e8cdf4f44b010b54ef438864.tar.bz2
Merge branch 'pci/virtualization'
- Cache VF config space size to optimize enumeration of many VFs (KarimAllah Ahmed) - Remove unnecessary <linux/pci-ats.h> include (Bjorn Helgaas) * pci/virtualization: PCI/IOV: Remove unnecessary include of <linux/pci-ats.h> PCI/IOV: Use VF0 cached config space size for other VFs
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/iov.c3
-rw-r--r--drivers/pci/pci.h1
-rw-r--r--drivers/pci/probe.c17
3 files changed, 20 insertions, 1 deletions
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index c5f3cd4ed766..9616eca3182f 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -13,7 +13,6 @@
#include <linux/export.h>
#include <linux/string.h>
#include <linux/delay.h>
-#include <linux/pci-ats.h>
#include "pci.h"
#define VIRTFN_ID_LEN 16
@@ -133,6 +132,8 @@ static void pci_read_vf_config_common(struct pci_dev *virtfn)
&physfn->sriov->subsystem_vendor);
pci_read_config_word(virtfn, PCI_SUBSYSTEM_ID,
&physfn->sriov->subsystem_device);
+
+ physfn->sriov->cfg_size = pci_cfg_space_size(virtfn);
}
int pci_iov_add_virtfn(struct pci_dev *dev, int id)
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 672ba4d1659e..662b7457db23 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -290,6 +290,7 @@ struct pci_sriov {
u16 driver_max_VFs; /* Max num VFs driver supports */
struct pci_dev *dev; /* Lowest numbered PF */
struct pci_dev *self; /* This PF */
+ u32 cfg_size; /* VF config space size */
u32 class; /* VF device */
u8 hdr_type; /* VF header type */
u16 subsystem_vendor; /* VF subsystem vendor */
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 966641d517ba..b1c05b5054a0 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1439,12 +1439,29 @@ static int pci_cfg_space_size_ext(struct pci_dev *dev)
return PCI_CFG_SPACE_EXP_SIZE;
}
+#ifdef CONFIG_PCI_IOV
+static bool is_vf0(struct pci_dev *dev)
+{
+ if (pci_iov_virtfn_devfn(dev->physfn, 0) == dev->devfn &&
+ pci_iov_virtfn_bus(dev->physfn, 0) == dev->bus->number)
+ return true;
+
+ return false;
+}
+#endif
+
int pci_cfg_space_size(struct pci_dev *dev)
{
int pos;
u32 status;
u16 class;
+#ifdef CONFIG_PCI_IOV
+ /* Read cached value for all VFs except for VF0 */
+ if (dev->is_virtfn && !is_vf0(dev))
+ return dev->physfn->sriov->cfg_size;
+#endif
+
if (dev->bus->bus_flags & PCI_BUS_FLAGS_NO_EXTCFG)
return PCI_CFG_SPACE_SIZE;