Program the MI_WAIT_FOR_EVENT without reference to DERRMR by knowing its
state is ~0u when not in use, and is only in use when userspace requires
it. By not touching intel_regsiter_access we completely eliminate the
risk that we leak the forcewake ref, which can cause later rc6 to fail.
At the same time, note that vlv/chv use a different mechanism (read
none) for coupling between the render engine and display.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
tests/perf_pmu.c | 63 ++++++++++++++++++++++++++++----------------------------
1 file changed, 32 insertions(+), 31 deletions(-)
diff --git a/tests/perf_pmu.c b/tests/perf_pmu.c
index 5118c023..7fd1506e 100644
--- a/tests/perf_pmu.c
+++ b/tests/perf_pmu.c
@@ -498,20 +498,22 @@ event_wait(int gem_fd, const struct intel_execution_engine2 *e)
{
struct drm_i915_gem_exec_object2 obj = { };
struct drm_i915_gem_execbuffer2 eb = { };
- data_t data;
- igt_display_t *display = &data.display;
const uint32_t DERRMR = 0x44050;
+ const uint32_t FORCEWAKE_MT = 0xa188;
unsigned int valid_tests = 0;
- uint32_t batch[8], *b;
+ uint32_t batch[16], *b;
+ uint16_t devid;
igt_output_t *output;
- uint32_t bb_handle;
- uint32_t reg;
+ data_t data;
enum pipe p;
int fd;
- igt_require(intel_gen(intel_get_drm_devid(gem_fd)) >= 6);
- igt_require(intel_register_access_init(intel_get_pci_device(),
- false, gem_fd) == 0);
+ devid = intel_get_drm_devid(gem_fd);
+ igt_require(intel_gen(devid) >= 7);
+ igt_skip_on(IS_VALLEYVIEW(devid) || IS_CHERRYVIEW(devid));
+
+ kmstest_set_vt_graphics_mode();
+ igt_display_init(&data.display, gem_fd);
/**
* We will use the display to render event forwarind so need to
@@ -522,51 +524,52 @@ event_wait(int gem_fd, const struct intel_execution_engine2 *e)
* listen to the recorded time spent in engine wait state as reported
* by the PMU.
*/
- reg = intel_register_read(DERRMR);
-
- kmstest_set_vt_graphics_mode();
- igt_display_init(&data.display, gem_fd);
-
- bb_handle = gem_create(gem_fd, 4096);
+ obj.handle = gem_create(gem_fd, 4096);
b = batch;
*b++ = MI_LOAD_REGISTER_IMM;
+ *b++ = FORCEWAKE_MT;
+ *b++ = 2 << 16 | 2;
+ *b++ = MI_LOAD_REGISTER_IMM;
*b++ = DERRMR;
- *b++ = reg & ~((1 << 3) | (1 << 11) | (1 << 21));
- *b++ = MI_WAIT_FOR_EVENT | MI_WAIT_FOR_PIPE_A_VBLANK;
+ *b++ = ~0u;
+ *b++ = MI_WAIT_FOR_EVENT;
*b++ = MI_LOAD_REGISTER_IMM;
*b++ = DERRMR;
- *b++ = reg;
+ *b++ = ~0u;
+ *b++ = MI_LOAD_REGISTER_IMM;
+ *b++ = FORCEWAKE_MT;
+ *b++ = 2 << 16;
*b++ = MI_BATCH_BUFFER_END;
- obj.handle = bb_handle;
-
eb.buffer_count = 1;
eb.buffers_ptr = to_user_pointer(&obj);
eb.flags = e2ring(gem_fd, e) | I915_EXEC_SECURE;
- for_each_pipe_with_valid_output(display, p, output) {
+ for_each_pipe_with_valid_output(&data.display, p, output) {
struct igt_helper_process waiter = { };
const unsigned int frames = 3;
- unsigned int frame;
uint64_t val[2];
- batch[3] = MI_WAIT_FOR_EVENT;
+ batch[6] = MI_WAIT_FOR_EVENT;
switch (p) {
case PIPE_A:
- batch[3] |= MI_WAIT_FOR_PIPE_A_VBLANK;
+ batch[6] |= MI_WAIT_FOR_PIPE_A_VBLANK;
+ batch[5] = ~(1 << 3);
break;
case PIPE_B:
- batch[3] |= MI_WAIT_FOR_PIPE_B_VBLANK;
+ batch[6] |= MI_WAIT_FOR_PIPE_B_VBLANK;
+ batch[5] = ~(1 << 11);
break;
case PIPE_C:
- batch[3] |= MI_WAIT_FOR_PIPE_C_VBLANK;
+ batch[6] |= MI_WAIT_FOR_PIPE_C_VBLANK;
+ batch[5] = ~(1 << 21);
break;
default:
continue;
}
- gem_write(gem_fd, bb_handle, 0, batch, sizeof(batch));
+ gem_write(gem_fd, obj.handle, 0, batch, sizeof(batch));
data.pipe = p;
prepare_crtc(&data, gem_fd, output);
@@ -589,9 +592,9 @@ event_wait(int gem_fd, const struct intel_execution_engine2 *e)
}
}
- for (frame = 0; frame < frames; frame++) {
+ for (unsigned int frame = 0; frame < frames; frame++) {
gem_execbuf(gem_fd, &eb);
- gem_sync(gem_fd, bb_handle);
+ gem_sync(gem_fd, obj.handle);
}
igt_stop_helper(&waiter);
@@ -606,9 +609,7 @@ event_wait(int gem_fd, const struct intel_execution_engine2 *e)
igt_assert(val[1] - val[0] > 0);
}
- gem_close(gem_fd, bb_handle);
-
- intel_register_access_fini();
+ gem_close(gem_fd, obj.handle);
igt_require_f(valid_tests,
"no valid crtc/connector combinations found\n");
--
2.15.0
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