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

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/i915/i915_drv.c
View File

@ -350,6 +350,7 @@ static int i915_getparam(struct drm_device *dev, void *data,
case I915_PARAM_HAS_EXEC_SOFTPIN:
case I915_PARAM_HAS_EXEC_ASYNC:
case I915_PARAM_HAS_EXEC_FENCE:
case I915_PARAM_HAS_EXEC_CAPTURE:
/* For the time being all of these are always true;
* if some supported hardware does not have one of these
* features this value needs to be provided from

3
drivers/gpu/drm/i915/i915_drv.h
View File

@ -1025,6 +1025,9 @@ struct i915_gpu_state {
u32 *pages[0];
} *ringbuffer, *batchbuffer, *wa_batchbuffer, *ctx, *hws_page;
struct drm_i915_error_object **user_bo;
long user_bo_count;
struct drm_i915_error_object *wa_ctx;
struct drm_i915_error_request {

12
drivers/gpu/drm/i915/i915_gem_execbuffer.c
View File

@ -1114,6 +1114,18 @@ i915_gem_execbuffer_move_to_gpu(struct drm_i915_gem_request *req,
list_for_each_entry(vma, vmas, exec_list) {
struct drm_i915_gem_object *obj = vma->obj;
if (vma->exec_entry->flags & EXEC_OBJECT_CAPTURE) {
struct i915_gem_capture_list *capture;
capture = kmalloc(sizeof(*capture), GFP_KERNEL);
if (unlikely(!capture))
return -ENOMEM;
capture->next = req->capture_list;
capture->vma = vma;
req->capture_list = capture;
}
if (vma->exec_entry->flags & EXEC_OBJECT_ASYNC)
continue;

16
drivers/gpu/drm/i915/i915_gem_request.c
View File

@ -292,6 +292,19 @@ static void advance_ring(struct drm_i915_gem_request *request)
request->ring->head = tail;
}
static void free_capture_list(struct drm_i915_gem_request *request)
{
struct i915_gem_capture_list *capture;
capture = request->capture_list;
while (capture) {
struct i915_gem_capture_list *next = capture->next;
kfree(capture);
capture = next;
}
}
static void i915_gem_request_retire(struct drm_i915_gem_request *request)
{
struct intel_engine_cs *engine = request->engine;
@ -317,6 +330,8 @@ static void i915_gem_request_retire(struct drm_i915_gem_request *request)
unreserve_seqno(request->engine);
advance_ring(request);
free_capture_list(request);
/* Walk through the active list, calling retire on each. This allows
* objects to track their GPU activity and mark themselves as idle
* when their *last* active request is completed (updating state
@ -615,6 +630,7 @@ i915_gem_request_alloc(struct intel_engine_cs *engine,
req->global_seqno = 0;
req->file_priv = NULL;
req->batch = NULL;
req->capture_list = NULL;
/*
* Reserve space in the ring buffer for all the commands required to

11
drivers/gpu/drm/i915/i915_gem_request.h
View File

@ -73,6 +73,11 @@ struct i915_priotree {
#define I915_PRIORITY_MIN (-I915_PRIORITY_MAX)
};
struct i915_gem_capture_list {
struct i915_gem_capture_list *next;
struct i915_vma *vma;
};
/**
* Request queue structure.
*
@ -167,6 +172,12 @@ struct drm_i915_gem_request {
* error state dump only).
*/
struct i915_vma *batch;
/** Additional buffers requested by userspace to be captured upon
* a GPU hang. The vma/obj on this list are protected by their
* active reference - all objects on this list must also be
* on the active_list (of their final request).
*/
struct i915_gem_capture_list *capture_list;
struct list_head active_list;
/** Time at which this request was emitted, in jiffies. */

40
drivers/gpu/drm/i915/i915_gpu_error.c
View File

@ -712,6 +712,10 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
print_error_obj(m, dev_priv->engine[i], NULL, obj);
}
for (j = 0; j < ee->user_bo_count; j++)
print_error_obj(m, dev_priv->engine[i],
"user", ee->user_bo[j]);
if (ee->num_requests) {
err_printf(m, "%s --- %d requests\n",
dev_priv->engine[i]->name,
@ -825,11 +829,15 @@ void __i915_gpu_state_free(struct kref *error_ref)
{
struct i915_gpu_state *error =
container_of(error_ref, typeof(*error), ref);
int i;
long i, j;
for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
struct drm_i915_error_engine *ee = &error->engine[i];
for (j = 0; j < ee->user_bo_count; j++)
i915_error_object_free(ee->user_bo[j]);
kfree(ee->user_bo);
i915_error_object_free(ee->batchbuffer);
i915_error_object_free(ee->wa_batchbuffer);
i915_error_object_free(ee->ringbuffer);
@ -1346,6 +1354,35 @@ static void record_context(struct drm_i915_error_context *e,
e->active = ctx->active_count;
}
static void request_record_user_bo(struct drm_i915_gem_request *request,
struct drm_i915_error_engine *ee)
{
struct i915_gem_capture_list *c;
struct drm_i915_error_object **bo;
long count;
count = 0;
for (c = request->capture_list; c; c = c->next)
count++;
bo = NULL;
if (count)
bo = kcalloc(count, sizeof(*bo), GFP_ATOMIC);
if (!bo)
return;
count = 0;
for (c = request->capture_list; c; c = c->next) {
bo[count] = i915_error_object_create(request->i915, c->vma);
if (!bo[count])
break;
count++;
}
ee->user_bo = bo;
ee->user_bo_count = count;
}
static void i915_gem_record_rings(struct drm_i915_private *dev_priv,
struct i915_gpu_state *error)
{
@ -1392,6 +1429,7 @@ static void i915_gem_record_rings(struct drm_i915_private *dev_priv,
ee->wa_batchbuffer =
i915_error_object_create(dev_priv,
engine->scratch);
request_record_user_bo(request, ee);
ee->ctx =
i915_error_object_create(dev_priv,

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 {