Mesa (master): anv: query CS timestamp frequency from the kernel
Lionel Landwerlin
llandwerlin at kemper.freedesktop.org
Mon Dec 4 18:05:56 UTC 2017
Module: Mesa
Branch: master
Commit: 2ead8f1690823bbb1acb8102bb6ceee26e8574b1
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=2ead8f1690823bbb1acb8102bb6ceee26e8574b1
Author: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Date: Mon Dec 4 15:22:12 2017 +0000
anv: query CS timestamp frequency from the kernel
The reference value in gen_device_info isn't going to be acurate on
Gen10+. We should query it from the kernel, which reads a couple of
register to compute the actual value.
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Reviewed-by: Rafael Antognolli <rafael.antognolli at intel.com>
---
src/intel/vulkan/anv_device.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/src/intel/vulkan/anv_device.c b/src/intel/vulkan/anv_device.c
index 258668fa0b..97124154b6 100644
--- a/src/intel/vulkan/anv_device.c
+++ b/src/intel/vulkan/anv_device.c
@@ -371,6 +371,19 @@ anv_physical_device_init(struct anv_physical_device *device,
bool swizzled = anv_gem_get_bit6_swizzle(fd, I915_TILING_X);
+ /* Starting with Gen10, the timestamp frequency of the command streamer may
+ * vary from one part to another. We can query the value from the kernel.
+ */
+ if (device->info.gen >= 10) {
+ int timestamp_frequency =
+ anv_gem_get_param(fd, I915_PARAM_CS_TIMESTAMP_FREQUENCY);
+
+ if (timestamp_frequency < 0)
+ intel_logw("Kernel 4.16-rc1+ required to properly query CS timestamp frequency");
+ else
+ device->info.timestamp_frequency = timestamp_frequency;
+ }
+
/* GENs prior to 8 do not support EU/Subslice info */
if (device->info.gen >= 8) {
device->subslice_total = anv_gem_get_param(fd, I915_PARAM_SUBSLICE_TOTAL);
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