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drm/i915: Copy user requested buffers into the error state

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Introduce a new execobject.flag (EXEC_OBJECT_CAPTURE) that userspace may
use to indicate that it wants the contents of this buffer preserved in
the error state (/sys/class/drm/cardN/error) following a GPU hang
involving this batch.

Use this at your discretion, the contents of the error state. although
compressed, are allocated with GFP_ATOMIC (i.e. limited) and kept for all
eternity (until the error state is destroyed).

Based on an earlier patch by Ben Widawsky <ben@bwidawsk.net>
Testcase: igt/gem_exec_capture
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Matt Turner <mattst88@gmail.com>
Acked-by: Ben Widawsky <ben@bwidawsk.net>
Acked-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170415093902.22581-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2017-04-15 10:39:02 +01:00
parent f4bf77b495
commit b0fd47adc6
7 changed files with 96 additions and 2 deletions
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15
include/uapi/drm/i915_drm.h
View File

@@ -412,6 +412,12 @@ typedef struct drm_i915_irq_wait {
*/
#define I915_PARAM_HAS_EXEC_FENCE 44
/* Query whether DRM_I915_GEM_EXECBUFFER2 supports the ability to capture
* user specified bufffers for post-mortem debugging of GPU hangs. See
* EXEC_OBJECT_CAPTURE.
*/
#define I915_PARAM_HAS_EXEC_CAPTURE 45
typedef struct drm_i915_getparam {
__s32 param;
/*
@@ -775,8 +781,15 @@ struct drm_i915_gem_exec_object2 {
* I915_PARAM_HAS_EXEC_FENCE to order execbufs and execute them asynchronously.
*/
#define EXEC_OBJECT_ASYNC (1<<6)
/* Request that the contents of this execobject be copied into the error
* state upon a GPU hang involving this batch for post-mortem debugging.
* These buffers are recorded in no particular order as "user" in
* /sys/class/drm/cardN/error. Query I915_PARAM_HAS_EXEC_CAPTURE to see
* if the kernel supports this flag.
*/
#define EXEC_OBJECT_CAPTURE (1<<7)
/* All remaining bits are MBZ and RESERVED FOR FUTURE USE */
#define __EXEC_OBJECT_UNKNOWN_FLAGS -(EXEC_OBJECT_ASYNC<<1)
#define __EXEC_OBJECT_UNKNOWN_FLAGS -(EXEC_OBJECT_CAPTURE<<1)
__u64 flags;
union {