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iris: avoid stack overflow in iris_bo_wait_syncobj()

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Keep most cases using the stack as it's cheaper, but fall back to the
heap when the size gets too big.

This should fix a stack overflow reported by @rhezashan for a case
where we had lots of iris_screens.

Credits to Matt Turner and José Roberto de Souza for their work on
this issue, which led us to find its root cause.

Cc: mesa-stable
Reported-by: rheza shandikri (@rhezashan in gitlab)
Credits-to: José Roberto de Souza <jose.souza@intel.com>
Credits-to: Matt Turner <mattst88@gmail.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
(cherry picked from commit 3cec15dd14)

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25404>
This commit is contained in:
Paulo Zanoni 2023-09-08 14:29:51 -07:00 • committed by Matt Turner
parent 3a257694f6
commit 2e4c04864a
1 changed files with 7 additions and 1 deletions
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8
src/gallium/drivers/iris/iris_bufmgr.c
View file

@ -50,6 +50,7 @@
#include "errno.h"
#include "common/intel_aux_map.h"
#include "common/intel_clflush.h"
#include "c99_alloca.h"
#include "dev/intel_debug.h"
#include "common/intel_gem.h"
#include "dev/intel_device_info.h"
@ -525,7 +526,10 @@ iris_bo_wait_syncobj(struct iris_bo *bo, int64_t timeout_ns)
simple_mtx_lock(&bufmgr->bo_deps_lock);
uint32_t handles[bo->deps_size * IRIS_BATCH_COUNT * 2 + is_external];
const int handles_len = bo->deps_size * IRIS_BATCH_COUNT * 2 + is_external;
uint32_t *handles = handles_len <= 32 ?
(uint32_t *)alloca(handles_len * sizeof(*handles)) :
(uint32_t *)malloc(handles_len * sizeof(*handles));
int handle_count = 0;
if (is_external) {
@ -575,6 +579,8 @@ iris_bo_wait_syncobj(struct iris_bo *bo, int64_t timeout_ns)
}
out:
if (handles_len > 32)
free(handles);
if (external_implicit_syncobj)
iris_syncobj_reference(bufmgr, &external_implicit_syncobj, NULL);