This is a note to let you know that I've just added the patch titled
drm/i915: Fix EIO/wedged handling in gem fault handler
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-i915-fix-eio-wedged-handling-in-gem-fault-handler.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2232f0315c6688f5ff6b2067ea88d97542034873 Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@xxxxxxxx>
Date: Thu, 4 Sep 2014 09:36:18 +0200
Subject: drm/i915: Fix EIO/wedged handling in gem fault handler
From: Daniel Vetter <daniel.vetter@xxxxxxxx>
commit 2232f0315c6688f5ff6b2067ea88d97542034873 upstream.
In
commit 1f83fee08d625f8d0130f9fe5ef7b17c2e022f3c
Author: Daniel Vetter <daniel.vetter@xxxxxxxx>
Date: Thu Nov 15 17:17:22 2012 +0100
drm/i915: clear up wedged transitions
I've accidentally inverted the EIO/wedged handling in the fault
handler: We want to return the EIO as a SIGBUS only if it's not
because of the gpu having died, to prevent userspace from unduly
dying.
In my defence the comment right above is completely misleading, so fix
both.
v2: Drop the WARN_ON, it's not actually a bug to e.g. receive an -EIO
when swap-in fails.
v3: Don't remove too much ... oops.
Reported-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1426,10 +1426,13 @@ unlock:
out:
switch (ret) {
case -EIO:
- /* If this -EIO is due to a gpu hang, give the reset code a
- * chance to clean up the mess. Otherwise return the proper
- * SIGBUS. */
- if (i915_terminally_wedged(&dev_priv->gpu_error)) {
+ /*
+ * We eat errors when the gpu is terminally wedged to avoid
+ * userspace unduly crashing (gl has no provisions for mmaps to
+ * fail). But any other -EIO isn't ours (e.g. swap in failure)
+ * and so needs to be reported.
+ */
+ if (!i915_terminally_wedged(&dev_priv->gpu_error)) {
ret = VM_FAULT_SIGBUS;
break;
}
Patches currently in stable-queue which might be from daniel.vetter@xxxxxxxx are
queue-3.14/drm-i915-fix-eio-wedged-handling-in-gem-fault-handler.patch
queue-3.14/drm-i915-remove-bogus-__init-annotation-from-dmi-callbacks.patch
queue-3.14/drm-i915-read-head-register-back-in-init_ring_common-to-enforce-ordering.patch
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