PCI: support device-specific reset methods

Add a new type of quirk for resetting devices at pci_dev_reset time.
This is necessary to handle device with nonstandard reset procedures,
especially useful for guest drivers.

Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Dexuan Cui <dexuan.cui@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 0bc27e0..6011d06 100644 (file)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2284,6 +2284,21 @@ static int pci_parent_bus_reset(struct pci_dev *dev, int probe)
        return 0;
 }
 
+static int pci_dev_specific_reset(struct pci_dev *dev, int probe)
+{
+       struct pci_dev_reset_methods *i;
+
+       for (i = pci_dev_reset_methods; i->reset; i++) {
+               if ((i->vendor == dev->vendor ||
+                    i->vendor == (u16)PCI_ANY_ID) &&
+                   (i->device == dev->device ||
+                    i->device == (u16)PCI_ANY_ID))
+                       return i->reset(dev, probe);
+       }
+
+       return -ENOTTY;
+}
+
 static int pci_dev_reset(struct pci_dev *dev, int probe)
 {
        int rc;
@@ -2296,6 +2311,10 @@ static int pci_dev_reset(struct pci_dev *dev, int probe)
                down(&dev->dev.sem);
        }
 
+       rc = pci_dev_specific_reset(dev, probe);
+       if (rc != -ENOTTY)
+               goto done;
+
        rc = pcie_flr(dev, probe);
        if (rc != -ENOTTY)
                goto done;

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 33ed8e0..709eaa4 100644 (file)
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -313,4 +313,12 @@ static inline int pci_resource_alignment(struct pci_dev *dev,
 
 extern void pci_enable_acs(struct pci_dev *dev);
 
+struct pci_dev_reset_methods {
+       u16 vendor;
+       u16 device;
+       int (*reset)(struct pci_dev *dev, int probe);
+};
+
+extern struct pci_dev_reset_methods pci_dev_reset_methods[];
+
 #endif /* DRIVERS_PCI_H */

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index f70f4e2..86c9177 100644 (file)
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2636,6 +2636,15 @@ static int __init pci_apply_final_quirks(void)
 }
 
 fs_initcall_sync(pci_apply_final_quirks);
+
+/*
+ * Followings are device-specific reset methods which can be used to
+ * reset a single function if other methods (e.g. FLR, PM D0->D3) are
+ * not available.
+ */
+struct pci_dev_reset_methods pci_dev_reset_methods[] = {
+       { 0 }
+};
 #else
 void pci_fixup_device(enum pci_fixup_pass pass, struct pci_dev *dev) {}
 #endif