[RESEND,v2,2/7] powerpc/powernv: Issue fundamental reset if required

Commit Message

Gavin Shan Feb. 17, 2015, 7:13 a.m. UTC

Function pnv_pci_reset_secondary_bus() is used to reset specified
PCI bus, which is leaded by root complex or PCI bridge. That means
the function shouldn't be called on PCI root bus and the patch
removes the logic for that case.

Also, some adapters may require fundamental reset to reload their
firmwares. The patch translates hot reset to fundamental reset
if required.

Signed-off-by: Gavin Shan <[e-mail]>
---
 arch/powerpc/platforms/powernv/eeh-powernv.c | 36 +++++++++++++++++++++-------
 1 file changed, 27 insertions(+), 9 deletions(-)

Patch

diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
index 8cec57d..eeda6e1 100644
--- a/arch/powerpc/platforms/powernv/eeh-powernv.c
+++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
@@ -811,18 +811,36 @@  static int pnv_eeh_bridge_reset(struct pci_dev *dev, int option)
 	return (rc == OPAL_SUCCESS) ? 0 : -EIO;
 }
 
-void pnv_pci_reset_secondary_bus(struct pci_dev *dev)
+static int pnv_pci_dev_reset_type(struct pci_dev *pdev, void *data)
 {
-	struct pci_controller *hose;
+	int *freset = data;
 
-	if (pci_is_root_bus(dev->bus)) {
-		hose = pci_bus_to_host(dev->bus);
-		pnv_eeh_phb_reset(hose, EEH_RESET_HOT);
-		pnv_eeh_phb_reset(hose, EEH_RESET_DEACTIVATE);
-	} else {
-		pnv_eeh_bridge_reset(dev, EEH_RESET_HOT);
-		pnv_eeh_bridge_reset(dev, EEH_RESET_DEACTIVATE);
+	/*
+	 * Stop the iteration immediately if there is any
+	 * one PCI device requesting fundamental reset
+	 */
+	*freset |= pdev->needs_freset;
+	return *freset;
+}
+
+void pnv_pci_reset_secondary_bus(struct pci_dev *pdev)
+{
+	int option = EEH_RESET_HOT;
+	int freset = 0;
+
+	/* In case we need fundamental reset */
+	if (pdev->subordinate) {
+		pci_walk_bus(pdev->subordinate,
+			     pnv_pci_dev_reset_type,
+			     &freset);
+
+		if (freset)
+			option = EEH_RESET_FUNDAMENTAL;
 	}
+
+	/* Issue the requested type of reset */
+	pnv_eeh_bridge_reset(pdev, option);
+	pnv_eeh_bridge_reset(pdev, EEH_RESET_DEACTIVATE);
 }
 
 /**