linux-kernel - [PATCH] powerpc: EEH recovery tweaks (resend)

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Date:	Wed, 6 Dec 2006 12:32:20 -0600
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	Paul Mackerras <paulus@...ba.org>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: [PATCH] powerpc: EEH recovery tweaks (resend)


Paul,

Please apply and forward upstream. 
(Resend of patch from 27 October 2006.)

--linas

Subject: [PATCH] powerpc: EEH recovery tweaks

If one attempts to create a device driver recovery sequence that
does not depend on a hard reset of the device, but simply just
attempts to resume processing, then one discovers that the 
recovery sequence implemented on powerpc is not quite right.
This patch fixes this up.

Signed-off-by: Linas Vepstas <linas@...tin.ibm.com>

----
 arch/powerpc/platforms/pseries/eeh.c        |    1 +
 arch/powerpc/platforms/pseries/eeh_driver.c |   13 ++++++++++---
 2 files changed, 11 insertions(+), 3 deletions(-)

Index: linux-2.6.19-git7/arch/powerpc/platforms/pseries/eeh_driver.c
===================================================================
--- linux-2.6.19-git7.orig/arch/powerpc/platforms/pseries/eeh_driver.c	2006-11-29 15:57:37.000000000 -0600
+++ linux-2.6.19-git7/arch/powerpc/platforms/pseries/eeh_driver.c	2006-12-06 11:56:21.000000000 -0600
@@ -170,14 +170,19 @@ static void eeh_report_reset(struct pci_
 static void eeh_report_resume(struct pci_dev *dev, void *userdata)
 {
 	struct pci_driver *driver = dev->driver;
+	struct device_node *dn = pci_device_to_OF_node(dev);
 
 	dev->error_state = pci_channel_io_normal;
 
 	if (!driver)
 		return;
-	if (!driver->err_handler)
-		return;
-	if (!driver->err_handler->resume)
+
+	if ((PCI_DN(dn)->eeh_mode) & EEH_MODE_IRQ_DISABLED) {
+		PCI_DN(dn)->eeh_mode &= ~EEH_MODE_IRQ_DISABLED;
+		enable_irq(dev->irq);
+	}
+	if (!driver->err_handler ||
+	    !driver->err_handler->resume)
 		return;
 
 	driver->err_handler->resume(dev);
@@ -407,6 +412,8 @@ struct pci_dn * handle_eeh_events (struc
 
 		if (rc)
 			result = PCI_ERS_RESULT_NEED_RESET;
+		else
+			result = PCI_ERS_RESULT_RECOVERED;
 	}
 
 	/* If any device has a hard failure, then shut off everything. */
Index: linux-2.6.19-git7/arch/powerpc/platforms/pseries/eeh.c
===================================================================
--- linux-2.6.19-git7.orig/arch/powerpc/platforms/pseries/eeh.c	2006-11-29 15:57:37.000000000 -0600
+++ linux-2.6.19-git7/arch/powerpc/platforms/pseries/eeh.c	2006-12-06 11:56:21.000000000 -0600
@@ -337,6 +337,7 @@ int eeh_dn_check_failure(struct device_n
 			printk (KERN_ERR "EEH: Device driver ignored %d bad reads, panicing\n",
 			        pdn->eeh_check_count);
 			dump_stack();
+			msleep(5000);
 			
 			/* re-read the slot reset state */
 			if (read_slot_reset_state(pdn, rets) != 0)
-
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