Mesa (master): radv: inhibit clock gating when tracing with SQTT

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Module: Mesa
Branch: master
Commit: 5b5cd18853c1d5ff0b159ea6df78674532b78b18
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=5b5cd18853c1d5ff0b159ea6df78674532b78b18

Author: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Date:   Thu Jan 21 10:14:48 2021 +0100

radv: inhibit clock gating when tracing with SQTT

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

---

 src/amd/vulkan/radv_sqtt.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/amd/vulkan/radv_sqtt.c b/src/amd/vulkan/radv_sqtt.c
index ecd83fed728..a8f1ccc5385 100644
--- a/src/amd/vulkan/radv_sqtt.c
+++ b/src/amd/vulkan/radv_sqtt.c
@@ -357,6 +357,19 @@ 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;