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drm/ttm: Use fault-injection to test error paths

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Use fault-injection to test partial TTM swapout and interrupted swapin.
Return -EINTR for swapin to test the callers ability to handle and
restart the swapin, and on swapout perform a partial swapout to test that
the swapin and release_shrunken functionality.

v8:
- Use the core fault-injection system.
v9:
- Fix compliation failure for !CONFIG_FAULT_INJECTION

Cc: Christian König <christian.koenig@amd.com>
Cc: Somalapuram Amaranath <Amaranath.Somalapuram@amd.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: <dri-devel@lists.freedesktop.org>
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://lore.kernel.org/intel-xe/20250305092220.123405-4-thomas.hellstrom@linux.intel.com
This commit is contained in:
Thomas Hellström 2025-03-05 10:22:16 +01:00
parent b63d715b80
commit 8ae875f641
1 changed files with 24 additions and 1 deletions
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25
drivers/gpu/drm/ttm/ttm_pool.c
View file

@ -48,6 +48,13 @@
#include "ttm_module.h"
#ifdef CONFIG_FAULT_INJECTION
#include <linux/fault-inject.h>
static DECLARE_FAULT_ATTR(backup_fault_inject);
#else
#define should_fail(...) false
#endif
/**
* struct ttm_pool_dma - Helper object for coherent DMA mappings
*
@ -514,6 +521,12 @@ static int ttm_pool_restore_commit(struct ttm_pool_tt_restore *restore,
if (ttm_backup_page_ptr_is_handle(p)) {
unsigned long handle = ttm_backup_page_ptr_to_handle(p);
if (IS_ENABLED(CONFIG_FAULT_INJECTION) && ctx->interruptible &&
should_fail(&backup_fault_inject, 1)) {
ret = -EINTR;
break;
}
if (handle == 0) {
restore->restored_pages++;
continue;
@ -1007,7 +1020,13 @@ long ttm_pool_backup(struct ttm_pool *pool, struct ttm_tt *tt,
alloc_gfp = GFP_KERNEL | __GFP_HIGH | __GFP_NOWARN | __GFP_RETRY_MAYFAIL;
for (i = 0; i < tt->num_pages; ++i) {
num_pages = tt->num_pages;
/* Pretend doing fault injection by shrinking only half of the pages. */
if (IS_ENABLED(CONFIG_FAULT_INJECTION) && should_fail(&backup_fault_inject, 1))
num_pages = DIV_ROUND_UP(num_pages, 2);
for (i = 0; i < num_pages; ++i) {
s64 shandle;
page = tt->pages[i];
@ -1293,6 +1312,10 @@ int ttm_pool_mgr_init(unsigned long num_pages)
&ttm_pool_debugfs_globals_fops);
debugfs_create_file("page_pool_shrink", 0400, ttm_debugfs_root, NULL,
&ttm_pool_debugfs_shrink_fops);
#ifdef CONFIG_FAULT_INJECTION
fault_create_debugfs_attr("backup_fault_inject", ttm_debugfs_root,
&backup_fault_inject);
#endif
#endif
mm_shrinker = shrinker_alloc(0, "drm-ttm_pool");