This is a note to let you know that I've just added the patch titled
drm/i915: Decouple GPU error reporting from ring initialisation
to the 3.12-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-decouple-gpu-error-reporting-from-ring-initialisation.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 372fbb8e3927fc76b0f842d8eb8a798a71d8960f Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Date: Mon, 27 Jan 2014 13:52:34 +0000
Subject: drm/i915: Decouple GPU error reporting from ring initialisation
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From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
commit 372fbb8e3927fc76b0f842d8eb8a798a71d8960f upstream.
Currently we report through our error state only the rings that have
been initialised (as detected by ring->obj). This check is done after
the GPU reset and ring re-initialisation, which means that the software
state may not be the same as when we captured the hardware error and we
may not print out any of the vital information for debugging the hang.
This (and the implied object leak) is a regression from
commit 3d57e5bd1284f44e325f3a52d966259ed42f9e05
Author: Ben Widawsky <ben@xxxxxxxxxxxx>
Date: Mon Oct 14 10:01:36 2013 -0700
drm/i915: Do a fuller init after reset
Note that we are already starting to get bug reports with incomplete
error states from 3.13, which also hampers debugging userspace driver
issues.
v2: Prevent a NULL dereference on 830gm/845g after a GPU reset where
the scratch obj may be NULL.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Ben Widawsky <ben@xxxxxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
References: https://bugs.freedesktop.org/show_bug.cgi?id=74094
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
[danvet: Add a bit of fluff to make it clear we need this expedited in
stable.]
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/i915_gpu_error.c | 22 +++++++++++++++-------
2 files changed, 16 insertions(+), 7 deletions(-)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -296,6 +296,7 @@ struct drm_i915_error_state {
u64 fence[I915_MAX_NUM_FENCES];
struct timeval time;
struct drm_i915_error_ring {
+ bool valid;
struct drm_i915_error_object {
int page_count;
u32 gtt_offset;
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -221,6 +221,9 @@ static void i915_ring_error_state(struct
unsigned ring)
{
BUG_ON(ring >= I915_NUM_RINGS); /* shut up confused gcc */
+ if (!error->ring[ring].valid)
+ return;
+
err_printf(m, "%s command stream:\n", ring_str(ring));
err_printf(m, " HEAD: 0x%08x\n", error->head[ring]);
err_printf(m, " TAIL: 0x%08x\n", error->tail[ring]);
@@ -272,7 +275,6 @@ int i915_error_state_to_str(struct drm_i
struct drm_device *dev = error_priv->dev;
drm_i915_private_t *dev_priv = dev->dev_private;
struct drm_i915_error_state *error = error_priv->error;
- struct intel_ring_buffer *ring;
int i, j, page, offset, elt;
if (!error) {
@@ -306,7 +308,7 @@ int i915_error_state_to_str(struct drm_i
if (INTEL_INFO(dev)->gen == 7)
err_printf(m, "ERR_INT: 0x%08x\n", error->err_int);
- for_each_ring(ring, dev_priv, i)
+ for (i = 0; i < ARRAY_SIZE(error->ring); i++)
i915_ring_error_state(m, dev, error, i);
if (error->active_bo)
@@ -363,8 +365,7 @@ int i915_error_state_to_str(struct drm_i
}
}
- obj = error->ring[i].ctx;
- if (obj) {
+ if ((obj = error->ring[i].ctx)) {
err_printf(m, "%s --- HW Context = 0x%08x\n",
dev_priv->ring[i].name,
obj->gtt_offset);
@@ -644,7 +645,8 @@ i915_error_first_batchbuffer(struct drm_
return NULL;
obj = ring->scratch.obj;
- if (acthd >= i915_gem_obj_ggtt_offset(obj) &&
+ if (obj != NULL &&
+ acthd >= i915_gem_obj_ggtt_offset(obj) &&
acthd < i915_gem_obj_ggtt_offset(obj) + obj->base.size)
return i915_error_object_create(dev_priv, obj);
}
@@ -747,11 +749,17 @@ static void i915_gem_record_rings(struct
struct drm_i915_error_state *error)
{
struct drm_i915_private *dev_priv = dev->dev_private;
- struct intel_ring_buffer *ring;
struct drm_i915_gem_request *request;
int i, count;
- for_each_ring(ring, dev_priv, i) {
+ for (i = 0; i < I915_NUM_RINGS; i++) {
+ struct intel_ring_buffer *ring = &dev_priv->ring[i];
+
+ if (ring->dev == NULL)
+ continue;
+
+ error->ring[i].valid = true;
+
i915_record_ring_state(dev, error, ring);
error->ring[i].batchbuffer =
Patches currently in stable-queue which might be from chris@xxxxxxxxxxxxxxxxxx are
queue-3.12/drm-i915-flush-outstanding-requests-before-allocating-new-seqno.patch
queue-3.12/drm-i915-decouple-gpu-error-reporting-from-ring-initialisation.patch
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