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charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit LGTM. Reviewed-by: Sobin Thomas On 5/5/2026 4:07 AM, Jia Yao wrote: > The PREFETCH_SPLIT_VMA subtest splits a buffer in half and relies on a > GPU atomic fault to trigger SVM migration of the first half to VRAM. > On PVC (XE_VRAM_FLAGS_NEED64K), xe_svm_range_needs_migrate_to_vram() > rejects ranges smaller than 64K, so when bo_size=SZ_64K the 32K split > half never migrates, causing an atomic timeout. > > Fix by passing SZ_128K as bo_size for PREFETCH_SPLIT_VMA subtests so > each half is exactly 64K, and align bo_size to 64K inside > madvise_prefetch_op() to match the granularity PVC requires. > > Cc: Sobin Thomas > Signed-off-by: Jia Yao > --- > tests/intel/xe_exec_system_allocator.c | 19 ++++++++++++++++--- > 1 file changed, 16 insertions(+), 3 deletions(-) > > diff --git a/tests/intel/xe_exec_system_allocator.c b/tests/intel/xe_exec_system_allocator.c > index 5580099f7..deef7626c 100644 > --- a/tests/intel/xe_exec_system_allocator.c > +++ b/tests/intel/xe_exec_system_allocator.c > @@ -1380,7 +1380,10 @@ madvise_prefetch_op(int fd, uint32_t vm, uint64_t addr, size_t bo_size, > uint32_t num_ranges; > > if (flags & PREFETCH_SPLIT_VMA) { > - bo_size = ALIGN(bo_size, SZ_4K); > + uint16_t dev_id = intel_get_drm_devid(fd); > + size_t alignment = IS_PONTEVECCHIO(dev_id) ? SZ_64K : SZ_4K; > + > + bo_size = ALIGN(bo_size, alignment); > > xe_vm_prefetch_async(fd, vm, 0, 0, addr, bo_size, NULL, 0, 0); > > @@ -2751,9 +2754,19 @@ int igt_main() > > for (const struct section *s = msections; s->name; s++) { > igt_subtest_f("madvise-%s", s->name) { > - xe_for_each_engine(fd, hwe) > - test_exec(fd, hwe, 1, 1, SZ_64K, 0, 0, NULL, > + xe_for_each_engine(fd, hwe) { > + /* > + * PREFETCH_SPLIT_VMA splits the buffer in half > + * and migrates the first half. On platforms with > + * 64K VRAM granularity (e.g. PVC), each half > + * must be >= 64K, so use SZ_128K as bo_size. > + */ > + size_t bo_size = (s->flags & PREFETCH_SPLIT_VMA) ? > + SZ_128K : SZ_64K; > + > + test_exec(fd, hwe, 1, 1, bo_size, 0, 0, NULL, > NULL, s->flags, NULL); > + } > } > } > --------------IZrfua4Knf6QGsgYPlwA87pg Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: 7bit

LGTM.

Reviewed-by: Sobin Thomas <sobin.thomas@intel.com>


On 5/5/2026 4:07 AM, Jia Yao wrote:
The PREFETCH_SPLIT_VMA subtest splits a buffer in half and relies on a
GPU atomic fault to trigger SVM migration of the first half to VRAM.
On PVC (XE_VRAM_FLAGS_NEED64K), xe_svm_range_needs_migrate_to_vram()
rejects ranges smaller than 64K, so when bo_size=SZ_64K the 32K split
half never migrates, causing an atomic timeout.

Fix by passing SZ_128K as bo_size for PREFETCH_SPLIT_VMA subtests so
each half is exactly 64K, and align bo_size to 64K inside
madvise_prefetch_op() to match the granularity PVC requires.

Cc: Sobin Thomas <sobin.thomas@intel.com>
Signed-off-by: Jia Yao <jia.yao@intel.com>
---
 tests/intel/xe_exec_system_allocator.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/tests/intel/xe_exec_system_allocator.c b/tests/intel/xe_exec_system_allocator.c
index 5580099f7..deef7626c 100644
--- a/tests/intel/xe_exec_system_allocator.c
+++ b/tests/intel/xe_exec_system_allocator.c
@@ -1380,7 +1380,10 @@ madvise_prefetch_op(int fd, uint32_t vm, uint64_t addr, size_t bo_size,
 	uint32_t num_ranges;
 
 	if (flags & PREFETCH_SPLIT_VMA) {
-		bo_size = ALIGN(bo_size, SZ_4K);
+		uint16_t dev_id = intel_get_drm_devid(fd);
+		size_t alignment = IS_PONTEVECCHIO(dev_id) ? SZ_64K : SZ_4K;
+
+		bo_size = ALIGN(bo_size, alignment);
 
 		xe_vm_prefetch_async(fd, vm, 0, 0, addr, bo_size, NULL, 0, 0);
 
@@ -2751,9 +2754,19 @@ int igt_main()
 
 	for (const struct section *s = msections; s->name; s++) {
 		igt_subtest_f("madvise-%s", s->name) {
-			xe_for_each_engine(fd, hwe)
-				test_exec(fd, hwe, 1, 1, SZ_64K, 0, 0, NULL,
+			xe_for_each_engine(fd, hwe) {
+				/*
+				 * PREFETCH_SPLIT_VMA splits the buffer in half
+				 * and migrates the first half. On platforms with
+				 * 64K VRAM granularity (e.g. PVC), each half
+				 * must be >= 64K, so use SZ_128K as bo_size.
+				 */
+				size_t bo_size = (s->flags & PREFETCH_SPLIT_VMA) ?
+						 SZ_128K : SZ_64K;
+
+				test_exec(fd, hwe, 1, 1, bo_size, 0, 0, NULL,
 					  NULL, s->flags, NULL);
+			}
 		}
 	}
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