The test wrote to the same dwords from multiple contexts, assuming that
the writes would be ordered by its submission. However, as it was using
multiple contexts without a write hazard, those timelines are not
coupled and the requests may be emitted to hw in any order. So emit a
write hazard for each individual dword in the scratch (avoiding the
write hazard for the scratch as a whole) to ensure the writes do occur
in the expected order.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
tests/gem_ctx_thrash.c | 92 ++++++++++++++++++++++++------------------
1 file changed, 53 insertions(+), 39 deletions(-)
diff --git a/tests/gem_ctx_thrash.c b/tests/gem_ctx_thrash.c
index 2cd9cfebf..b25f95f13 100644
--- a/tests/gem_ctx_thrash.c
+++ b/tests/gem_ctx_thrash.c
@@ -90,17 +90,13 @@ static void single(const char *name, bool all_engines)
{
struct drm_i915_gem_exec_object2 *obj;
struct drm_i915_gem_relocation_entry *reloc;
- unsigned engines[16];
- uint64_t size;
- uint32_t *ctx, *map, scratch;
- unsigned num_ctx;
- int fd, gen, num_engines;
+ unsigned int engines[16], num_engines, num_ctx;
+ uint32_t *ctx, *map, scratch, size;
+ int fd, gen;
#define MAX_LOOP 16
- fd = drm_open_driver_master(DRIVER_INTEL);
+ fd = drm_open_driver(DRIVER_INTEL);
igt_require_gem(fd);
- igt_require(gem_can_store_dword(fd, 0));
-
gem_require_contexts(fd);
gen = intel_gen(intel_get_drm_devid(fd));
@@ -108,54 +104,77 @@ static void single(const char *name, bool all_engines)
num_engines = 0;
if (all_engines) {
unsigned engine;
+
for_each_physical_engine(fd, engine) {
+ if (!gem_can_store_dword(fd, engine))
+ continue;
+
engines[num_engines++] = engine;
if (num_engines == ARRAY_SIZE(engines))
break;
}
- } else
+ } else {
+ igt_require(gem_can_store_dword(fd, 0));
engines[num_engines++] = 0;
+ }
+ igt_require(num_engines);
num_ctx = get_num_contexts(fd, num_engines);
size = ALIGN(num_ctx * sizeof(uint32_t), 4096);
- scratch = gem_create(fd, ALIGN(num_ctx * sizeof(uint32_t), 4096));
+ scratch = gem_create(fd, size);
gem_set_caching(fd, scratch, I915_CACHING_CACHED);
- obj = calloc(num_ctx, 2 * sizeof(*obj));
- reloc = calloc(num_ctx, sizeof(*reloc));
+ obj = calloc(num_ctx, 3 * sizeof(*obj));
+ reloc = calloc(num_ctx, 2 * sizeof(*reloc));
ctx = malloc(num_ctx * sizeof(uint32_t));
igt_assert(ctx);
for (unsigned n = 0; n < num_ctx; n++) {
ctx[n] = gem_context_create(fd);
- obj[2*n + 0].handle = scratch;
-
- reloc[n].target_handle = scratch;
- reloc[n].presumed_offset = 0;
- reloc[n].offset = sizeof(uint32_t);
- reloc[n].delta = n * sizeof(uint32_t);
- reloc[n].read_domains = I915_GEM_DOMAIN_INSTRUCTION;
- reloc[n].write_domain = 0; /* lies! */
+
+ obj[3*n + 0].handle = gem_create(fd, 4096);
+ reloc[2*n + 0].target_handle = obj[3*n + 0].handle;
+ reloc[2*n + 0].presumed_offset = 0;
+ reloc[2*n + 0].offset = 4000;
+ reloc[2*n + 0].delta = 0;
+ reloc[2*n + 0].read_domains = I915_GEM_DOMAIN_RENDER;
+ reloc[2*n + 0].write_domain = I915_GEM_DOMAIN_RENDER;
+
+ obj[3*n + 1].handle = scratch;
+ reloc[2*n + 1].target_handle = scratch;
+ reloc[2*n + 1].presumed_offset = 0;
+ reloc[2*n + 1].offset = sizeof(uint32_t);
+ reloc[2*n + 1].delta = n * sizeof(uint32_t);
+ reloc[2*n + 1].read_domains = I915_GEM_DOMAIN_RENDER;
+ reloc[2*n + 1].write_domain = 0; /* lies! */
if (gen >= 4 && gen < 8)
- reloc[n].offset += sizeof(uint32_t);
+ reloc[2*n + 1].offset += sizeof(uint32_t);
- obj[2*n + 1].relocs_ptr = to_user_pointer(&reloc[n]);
- obj[2*n + 1].relocation_count = 1;
+ obj[3*n + 2].relocs_ptr = to_user_pointer(&reloc[2*n]);
+ obj[3*n + 2].relocation_count = 2;
}
map = gem_mmap__cpu(fd, scratch, 0, size, PROT_WRITE);
- for (unsigned loop = 1; loop <= MAX_LOOP; loop <<= 1) {
- unsigned count = loop * num_ctx;
+ for (unsigned int loop = 1; loop <= MAX_LOOP; loop <<= 1) {
+ const unsigned int count = loop * num_ctx;
uint32_t *all;
all = malloc(count * sizeof(uint32_t));
- for (unsigned n = 0; n < count; n++)
+ for (unsigned int n = 0; n < count; n++)
all[n] = ctx[n % num_ctx];
igt_permute_array(all, count, xchg_int);
- for (unsigned n = 0; n < count; n++) {
- struct drm_i915_gem_execbuffer2 execbuf;
- unsigned r = n % num_ctx;
- uint64_t offset = reloc[r].presumed_offset +
reloc[r].delta;
+
+ for (unsigned int n = 0; n < count; n++) {
+ const unsigned int r = n % num_ctx;
+ struct drm_i915_gem_execbuffer2 execbuf = {
+ .buffers_ptr = to_user_pointer(&obj[3*r]),
+ .buffer_count = 3,
+ .flags = engines[n % num_engines],
+ .rsvd1 = all[n],
+ };
+ uint64_t offset =
+ reloc[2*r + 1].presumed_offset +
+ reloc[2*r + 1].delta;
uint32_t handle = gem_create(fd, 4096);
uint32_t buf[16];
int i;
@@ -176,27 +195,22 @@ static void single(const char *name, bool all_engines)
buf[++i] = all[n];
buf[++i] = MI_BATCH_BUFFER_END;
gem_write(fd, handle, 0, buf, sizeof(buf));
- obj[2*r + 1].handle = handle;
+ obj[3*r + 2].handle = handle;
- memset(&execbuf, 0, sizeof(execbuf));
- execbuf.buffers_ptr = to_user_pointer(&obj[2*r]);
- execbuf.buffer_count = 2;
- execbuf.flags = engines[n % num_engines];
- execbuf.rsvd1 = all[n];
gem_execbuf(fd, &execbuf);
gem_close(fd, handle);
}
- /* Note we lied about the write-domain when writing from the
+ /*
+ * Note we lied about the write-domain when writing from the
* GPU (in order to avoid inter-ring synchronisation), so now
* we have to force the synchronisation here.
*/
gem_set_domain(fd, scratch,
I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
- for (unsigned n = count - num_ctx; n < count; n++)
+ for (unsigned int n = count - num_ctx; n < count; n++)
igt_assert_eq(map[n % num_ctx], all[n]);
free(all);
- igt_progress(name, loop, MAX_LOOP);
}
munmap(map, size);
--
2.17.0
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