PCI: restore saved SR-IOV state
Restore the volatile registers in the SR-IOV capability after the
D3->D0 transition.
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 66cc414..b121e47 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -129,6 +129,25 @@
dev->sriov = NULL;
}
+static void sriov_restore_state(struct pci_dev *dev)
+{
+ int i;
+ u16 ctrl;
+ struct pci_sriov *iov = dev->sriov;
+
+ pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl);
+ if (ctrl & PCI_SRIOV_CTRL_VFE)
+ return;
+
+ for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++)
+ pci_update_resource(dev, i);
+
+ pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz);
+ pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
+ if (iov->ctrl & PCI_SRIOV_CTRL_VFE)
+ msleep(100);
+}
+
/**
* pci_iov_init - initialize the IOV capability
* @dev: the PCI device
@@ -180,3 +199,13 @@
return dev->sriov->pos + PCI_SRIOV_BAR +
4 * (resno - PCI_IOV_RESOURCES);
}
+
+/**
+ * pci_restore_iov_state - restore the state of the IOV capability
+ * @dev: the PCI device
+ */
+void pci_restore_iov_state(struct pci_dev *dev)
+{
+ if (dev->is_physfn)
+ sriov_restore_state(dev);
+}
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 2b3201e..676bbcb 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -775,6 +775,7 @@
}
pci_restore_pcix_state(dev);
pci_restore_msi_state(dev);
+ pci_restore_iov_state(dev);
return 0;
}
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 7d5327c..fd5ea4d 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -222,6 +222,7 @@
extern void pci_iov_release(struct pci_dev *dev);
extern int pci_iov_resource_bar(struct pci_dev *dev, int resno,
enum pci_bar_type *type);
+extern void pci_restore_iov_state(struct pci_dev *dev);
#else
static inline int pci_iov_init(struct pci_dev *dev)
{
@@ -236,6 +237,9 @@
{
return 0;
}
+static inline void pci_restore_iov_state(struct pci_dev *dev)
+{
+}
#endif /* CONFIG_PCI_IOV */
#endif /* DRIVERS_PCI_H */