sky2: advanced error reporting

Use the kernel interfaces for advanced error reporting.
This should be cleaner and clear up errors on boot.

For those systems with busted BIOS's that don't correctly
support mmconfig, advanced error reporting will be disabled.
The PCI registers for advanced error reporting start at 0x100 which
is too large to be accessed by legacy functions.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 27 insertions, 20 deletions

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 77bfcf0dda3..b81d81746c2 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -31,6 +31,7 @@
 #include <linux/etherdevice.h>
 #include <linux/ethtool.h>
 #include <linux/pci.h>
+#include <linux/aer.h>
 #include <linux/ip.h>
 #include <net/ip.h>
 #include <linux/tcp.h>
@@ -2421,7 +2422,11 @@ static void sky2_hw_error(struct sky2_hw *hw, unsigned port, u32 status)
 
 static void sky2_hw_intr(struct sky2_hw *hw)
 {
+	struct pci_dev *pdev = hw->pdev;
 	u32 status = sky2_read32(hw, B0_HWE_ISRC);
+	u32 hwmsk = sky2_read32(hw, B0_HWE_IMSK);
+
+	status &= hwmsk;
 
 	if (status & Y2_IS_TIST_OV)
 		sky2_write8(hw, GMAC_TI_ST_CTRL, GMT_ST_CLR_IRQ);
@@ -2431,7 +2436,7 @@ static void sky2_hw_intr(struct sky2_hw *hw)
 
 		pci_err = sky2_pci_read16(hw, PCI_STATUS);
 		if (net_ratelimit())
-			dev_err(&hw->pdev->dev, "PCI hardware error (0x%x)\n",
+			dev_err(&pdev->dev, "PCI hardware error (0x%x)\n",
 			        pci_err);
 
 		sky2_pci_write16(hw, PCI_STATUS,
@@ -2440,22 +2445,13 @@ static void sky2_hw_intr(struct sky2_hw *hw)
 
 	if (status & Y2_IS_PCI_EXP) {
 		/* PCI-Express uncorrectable Error occurred */
-		u32 pex_err;
-
-		pex_err = sky2_pci_read32(hw, PEX_UNC_ERR_STAT);
+		int pos = pci_find_aer_capability(hw->pdev);
+		u32 err;
 
+		pci_read_config_dword(pdev, pos + PCI_ERR_UNCOR_STATUS, &err);
 		if (net_ratelimit())
-			dev_err(&hw->pdev->dev, "PCI Express error (0x%x)\n",
-				pex_err);
-
-		/* clear the interrupt */
-		sky2_pci_write32(hw, PEX_UNC_ERR_STAT,
-				       0xffffffffUL);
-		if (pex_err & PEX_FATAL_ERRORS) {
-			u32 hwmsk = sky2_read32(hw, B0_HWE_IMSK);
-			hwmsk &= ~Y2_IS_PCI_EXP;
-			sky2_write32(hw, B0_HWE_IMSK, hwmsk);
-		}
+			dev_err(&pdev->dev, "PCI Express error (0x%x)\n", err);
+		pci_cleanup_aer_uncorrect_error_status(pdev);
 	}
 
 	if (status & Y2_HWE_L1_MASK)
@@ -2775,8 +2771,10 @@ static int __devinit sky2_init(struct sky2_hw *hw)
 
 static void sky2_reset(struct sky2_hw *hw)
 {
+	struct pci_dev *pdev = hw->pdev;
 	u16 status;
-	int i;
+	int i, cap;
+	u32 hwe_mask = Y2_HWE_ALL_MASK;
 
 	/* disable ASF */
 	if (hw->chip_id == CHIP_ID_YUKON_EX) {
@@ -2800,10 +2798,19 @@ static void sky2_reset(struct sky2_hw *hw)
 
 	sky2_write8(hw, B0_CTST, CS_MRST_CLR);
 
-	/* clear any PEX errors */
-	if (pci_find_capability(hw->pdev, PCI_CAP_ID_EXP))
-		sky2_pci_write32(hw, PEX_UNC_ERR_STAT, 0xffffffffUL);
+	cap = pci_find_capability(pdev, PCI_CAP_ID_EXP);
+	if (cap) {
+		/* Check for advanced error reporting */
+		pci_cleanup_aer_uncorrect_error_status(pdev);
+		pci_cleanup_aer_correct_error_status(pdev);
 
+		/* If error bit is stuck on ignore it */
+		if (sky2_read32(hw, B0_HWE_ISRC) & Y2_IS_PCI_EXP)
+			dev_info(&pdev->dev, "ignoring stuck error report bit\n");
+
+		else if (pci_enable_pcie_error_reporting(pdev))
+			hwe_mask |= Y2_IS_PCI_EXP;
+	}
 
 	sky2_power_on(hw);
 
@@ -2855,7 +2862,7 @@ static void sky2_reset(struct sky2_hw *hw)
 		sky2_write8(hw, RAM_BUFFER(i, B3_RI_RTO_XS2), SK_RI_TO_53);
 	}
 
-	sky2_write32(hw, B0_HWE_IMSK, Y2_HWE_ALL_MASK);
+	sky2_write32(hw, B0_HWE_IMSK, hwe_mask);
 
 	for (i = 0; i < hw->ports; i++)
 		sky2_gmac_reset(hw, i);