radv: inhibit clock gating when tracing with SQTT

Cc: <mesa-stable@lists.freedesktop.org>
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8616>

diff --git a/src/amd/vulkan/radv_sqtt.c b/src/amd/vulkan/radv_sqtt.c
index ecd83fe..a8f1ccc 100644 (file)
--- a/src/amd/vulkan/radv_sqtt.c
+++ b/src/amd/vulkan/radv_sqtt.c
@@ -358,6 +358,19 @@ radv_emit_spi_config_cntl(struct radv_device *device,
 }
 
 static void
+radv_emit_inhibit_clockgating(struct radv_device *device,
+                             struct radeon_cmdbuf *cs, bool inhibit)
+{
+       if (device->physical_device->rad_info.chip_class >= GFX10) {
+               radeon_set_uconfig_reg(cs, R_037390_RLC_PERFMON_CLK_CNTL,
+                                      S_037390_PERFMON_CLOCK_STATE(inhibit));
+       } else if (device->physical_device->rad_info.chip_class >= GFX8) {
+               radeon_set_uconfig_reg(cs, R_0372FC_RLC_PERFMON_CLK_CNTL,
+                                      S_0372FC_PERFMON_CLOCK_STATE(inhibit));
+       }
+}
+
+static void
 radv_emit_wait_for_idle(struct radv_device *device,
                        struct radeon_cmdbuf *cs, int family)
 {
@@ -407,6 +420,11 @@ radv_thread_trace_init_cs(struct radv_device *device)
                                        device->thread_trace.start_cs[family],
                                        family);
 
+               /* Disable clock gating before starting SQTT. */
+               radv_emit_inhibit_clockgating(device,
+                                             device->thread_trace.start_cs[family],
+                                             true);
+
                /* Enable SQG events that collects thread trace data. */
                radv_emit_spi_config_cntl(device,
                                          device->thread_trace.start_cs[family],
@@ -456,6 +474,11 @@ radv_thread_trace_init_cs(struct radv_device *device)
                                          device->thread_trace.stop_cs[family],
                                          false);
 
+               /* Restore previous state by re-enabling clock gating. */
+               radv_emit_inhibit_clockgating(device,
+                                             device->thread_trace.stop_cs[family],
+                                             false);
+
                result = ws->cs_finalize(device->thread_trace.stop_cs[family]);
                if (result != VK_SUCCESS)
                        return;