From 7539a613c646f9e870bbedfa753a54cf13b98d22 Mon Sep 17 00:00:00 2001
From: Jon Mason <mason@myri.com>
Date: Mon, 27 Jun 2011 05:05:01 +0000
Subject: [PATCH] myri10ge: Mask PCI Surprise Link Down Events
A SRAM parity error can cause a surprise link down. Since We can
recover from SRAM parity errors, mask PCI surprise down events.
Signed-off-by: Jon Mason <mason@myri.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/myri10ge/myri10ge.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
index a8ae641d0bd1..0f0f83d50ddc 100644
--- a/drivers/net/myri10ge/myri10ge.c
+++ b/drivers/net/myri10ge/myri10ge.c
@@ -3327,6 +3327,26 @@ static void myri10ge_select_firmware(struct myri10ge_priv *mgp)
mgp->fw_name);
}
+static void myri10ge_mask_surprise_down(struct pci_dev *pdev)
+{
+ struct pci_dev *bridge = pdev->bus->self;
+ int cap;
+ u32 mask;
+
+ if (bridge == NULL)
+ return;
+
+ cap = pci_find_ext_capability(bridge, PCI_EXT_CAP_ID_ERR);
+ if (cap) {
+ /* a sram parity error can cause a surprise link
+ * down; since we expect and can recover from sram
+ * parity errors, mask surprise link down events */
+ pci_read_config_dword(bridge, cap + PCI_ERR_UNCOR_MASK, &mask);
+ mask |= 0x20;
+ pci_write_config_dword(bridge, cap + PCI_ERR_UNCOR_MASK, mask);
+ }
+}
+
#ifdef CONFIG_PM
static int myri10ge_suspend(struct pci_dev *pdev, pm_message_t state)
{
@@ -3845,6 +3865,7 @@ static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
goto abort_with_enabled;
}
+ myri10ge_mask_surprise_down(pdev);
pci_set_master(pdev);
dac_enabled = 1;
status = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
--
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