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igt/gem_softpin: Exercise snoop+uncached abutting

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snooped objects are not allowed to abutt uncached objects on older gen
(!llc and global GTT) or else the GPU may hang if it prefetches across a
page boundary into a different memory type (i.e. CS reading from snoop).
The kernel should be checking the alignment rules as normal.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2016-01-23 18:10:46 +00:00
parent d4a05bc009
commit c5b0293ca3
1 changed files with 66 additions and 7 deletions
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73
tests/gem_softpin.c
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@ -78,7 +78,7 @@ static void test_invalid(int fd)
struct drm_i915_gem_exec_object2 object;
memset(&execbuf, 0, sizeof(execbuf));
execbuf.buffers_ptr = (unsigned long)&object;
execbuf.buffers_ptr = (uintptr_t)&object;
execbuf.buffer_count = 1;
memset(&object, 0, sizeof(object));
@ -132,7 +132,7 @@ static void test_softpin(int fd)
int loop;
memset(&execbuf, 0, sizeof(execbuf));
execbuf.buffers_ptr = (unsigned long)&object;
execbuf.buffers_ptr = (uintptr_t)&object;
execbuf.buffer_count = 1;
for (loop = 0; loop < 1024; loop++) {
memset(&object, 0, sizeof(object));
@ -178,7 +178,7 @@ static void test_overlap(int fd)
/* Find a hole */
memset(&execbuf, 0, sizeof(execbuf));
execbuf.buffers_ptr = (unsigned long)object;
execbuf.buffers_ptr = (uintptr_t)object;
execbuf.buffer_count = 1;
gem_execbuf(fd, &execbuf);
@ -241,7 +241,7 @@ static uint64_t busy_batch(int fd)
*map = MI_BATCH_BUFFER_END;
memset(&execbuf, 0, sizeof(execbuf));
execbuf.buffers_ptr = (unsigned long)object;
execbuf.buffers_ptr = (uintptr_t)object;
execbuf.buffer_count = 2;
if (gen >= 6)
execbuf.flags = I915_EXEC_BLT;
@ -301,7 +301,7 @@ static void test_evict_active(int fd)
/* Replace the active batch with ourselves, forcing an eviction */
memset(&execbuf, 0, sizeof(execbuf));
execbuf.buffers_ptr = (unsigned long)&object;
execbuf.buffers_ptr = (uintptr_t)&object;
execbuf.buffer_count = 1;
gem_execbuf(fd, &execbuf);
@ -310,6 +310,63 @@ static void test_evict_active(int fd)
igt_assert_eq_u64(object.offset, expected);
}
static void test_evict_snoop(int fd)
{
const uint32_t bbe = MI_BATCH_BUFFER_END;
struct drm_i915_gem_execbuffer2 execbuf;
struct drm_i915_gem_exec_object2 object[2];
uint64_t hole;
igt_require(!gem_has_llc(fd));
igt_require(!gem_uses_aliasing_ppgtt(fd));
memset(&execbuf, 0, sizeof(execbuf));
execbuf.buffers_ptr = (uintptr_t)object;
execbuf.buffer_count = 1;
/* Find a hole */
memset(object, 0, sizeof(object));
object[0].handle = gem_create(fd, 3*4096);
gem_write(fd, object[0].handle, 0, &bbe, sizeof(bbe));
gem_execbuf(fd, &execbuf);
gem_close(fd, object[0].handle);
hole = object[0].offset;
/* Create a snoop + uncached pair */
object[0].handle = gem_create(fd, 4096);
object[0].flags = EXEC_OBJECT_PINNED;
gem_set_caching(fd, object[0].handle, 1);
object[1].handle = gem_create(fd, 4096);
object[1].flags = EXEC_OBJECT_PINNED;
gem_write(fd, object[1].handle, 4096-sizeof(bbe), &bbe, sizeof(bbe));
execbuf.buffer_count = 2;
/* snoop abutting before uncached -> error */
object[0].offset = hole;
object[1].offset = hole + 4096;
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
/* snoop abutting after uncached -> error */
object[0].offset = hole + 4096;
object[1].offset = hole;
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
/* with gap -> okay */
object[0].offset = hole + 2*4096;
object[1].offset = hole;
igt_assert_eq(__gem_execbuf(fd, &execbuf), 0);
/* And we should force the snoop away (or the GPU may hang) */
object[0].flags = 0;
object[1].offset = hole + 4096;
igt_assert_eq(__gem_execbuf(fd, &execbuf), 0);
igt_assert(object[0].offset != hole);
igt_assert(object[0].offset != hole + 2*4096);
gem_close(fd, object[0].handle);
gem_close(fd, object[1].handle);
}
static void test_evict_hang(int fd)
{
const uint32_t bbe = MI_BATCH_BUFFER_END;
@ -328,7 +385,7 @@ static void test_evict_hang(int fd)
/* Replace the hanging batch with ourselves, forcing an eviction */
memset(&execbuf, 0, sizeof(execbuf));
execbuf.buffers_ptr = (unsigned long)&object;
execbuf.buffers_ptr = (uintptr_t)&object;
execbuf.buffer_count = 1;
gem_execbuf(fd, &execbuf);
@ -367,7 +424,7 @@ static void test_noreloc(int fd)
/* Find a hole */
memset(&execbuf, 0, sizeof(execbuf));
execbuf.buffers_ptr = (unsigned long)object;
execbuf.buffers_ptr = (uintptr_t)object;
execbuf.buffer_count = 1;
if (gen < 4)
execbuf.flags |= I915_EXEC_SECURE;
@ -446,6 +503,8 @@ igt_main
test_noreloc(fd);
igt_subtest("evict-active")
test_evict_active(fd);
igt_subtest("evict-snoop")
test_evict_snoop(fd);
igt_subtest("evict-hang")
test_evict_hang(fd);