+static const VkTimeDomainEXT anv_time_domains[] = {
+ VK_TIME_DOMAIN_DEVICE_EXT,
+ VK_TIME_DOMAIN_CLOCK_MONOTONIC_EXT,
+ VK_TIME_DOMAIN_CLOCK_MONOTONIC_RAW_EXT,
+};
+
+VkResult anv_GetPhysicalDeviceCalibrateableTimeDomainsEXT(
+ VkPhysicalDevice physicalDevice,
+ uint32_t *pTimeDomainCount,
+ VkTimeDomainEXT *pTimeDomains)
+{
+ int d;
+ VK_OUTARRAY_MAKE(out, pTimeDomains, pTimeDomainCount);
+
+ for (d = 0; d < ARRAY_SIZE(anv_time_domains); d++) {
+ vk_outarray_append(&out, i) {
+ *i = anv_time_domains[d];
+ }
+ }
+
+ return vk_outarray_status(&out);
+}
+
+static uint64_t
+anv_clock_gettime(clockid_t clock_id)
+{
+ struct timespec current;
+ int ret;
+
+ ret = clock_gettime(clock_id, ¤t);
+ if (ret < 0 && clock_id == CLOCK_MONOTONIC_RAW)
+ ret = clock_gettime(CLOCK_MONOTONIC, ¤t);
+ if (ret < 0)
+ return 0;
+
+ return (uint64_t) current.tv_sec * 1000000000ULL + current.tv_nsec;
+}
+
+#define TIMESTAMP 0x2358
+
+VkResult anv_GetCalibratedTimestampsEXT(
+ VkDevice _device,
+ uint32_t timestampCount,
+ const VkCalibratedTimestampInfoEXT *pTimestampInfos,
+ uint64_t *pTimestamps,
+ uint64_t *pMaxDeviation)
+{
+ ANV_FROM_HANDLE(anv_device, device, _device);
+ uint64_t timestamp_frequency = device->info.timestamp_frequency;
+ int ret;
+ int d;
+ uint64_t begin, end;
+ uint64_t max_clock_period = 0;
+
+ begin = anv_clock_gettime(CLOCK_MONOTONIC_RAW);
+
+ for (d = 0; d < timestampCount; d++) {
+ switch (pTimestampInfos[d].timeDomain) {
+ case VK_TIME_DOMAIN_DEVICE_EXT:
+ ret = anv_gem_reg_read(device, TIMESTAMP | 1,
+ &pTimestamps[d]);
+
+ if (ret != 0) {
+ return anv_device_set_lost(device, "Failed to read the TIMESTAMP "
+ "register: %m");
+ }
+ uint64_t device_period = DIV_ROUND_UP(1000000000, timestamp_frequency);
+ max_clock_period = MAX2(max_clock_period, device_period);
+ break;
+ case VK_TIME_DOMAIN_CLOCK_MONOTONIC_EXT:
+ pTimestamps[d] = anv_clock_gettime(CLOCK_MONOTONIC);
+ max_clock_period = MAX2(max_clock_period, 1);
+ break;
+
+ case VK_TIME_DOMAIN_CLOCK_MONOTONIC_RAW_EXT:
+ pTimestamps[d] = begin;
+ break;
+ default:
+ pTimestamps[d] = 0;
+ break;
+ }
+ }
+
+ end = anv_clock_gettime(CLOCK_MONOTONIC_RAW);
+
+ /*
+ * The maximum deviation is the sum of the interval over which we
+ * perform the sampling and the maximum period of any sampled
+ * clock. That's because the maximum skew between any two sampled
+ * clock edges is when the sampled clock with the largest period is
+ * sampled at the end of that period but right at the beginning of the
+ * sampling interval and some other clock is sampled right at the
+ * begining of its sampling period and right at the end of the
+ * sampling interval. Let's assume the GPU has the longest clock
+ * period and that the application is sampling GPU and monotonic:
+ *
+ * s e
+ * w x y z 0 1 2 3 4 5 6 7 8 9 a b c d e f
+ * Raw -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
+ *
+ * g
+ * 0 1 2 3
+ * GPU -----_____-----_____-----_____-----_____
+ *
+ * m
+ * x y z 0 1 2 3 4 5 6 7 8 9 a b c
+ * Monotonic -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
+ *
+ * Interval <----------------->
+ * Deviation <-------------------------->
+ *
+ * s = read(raw) 2
+ * g = read(GPU) 1
+ * m = read(monotonic) 2
+ * e = read(raw) b
+ *
+ * We round the sample interval up by one tick to cover sampling error
+ * in the interval clock
+ */
+
+ uint64_t sample_interval = end - begin + 1;
+
+ *pMaxDeviation = sample_interval + max_clock_period;
+
+ return VK_SUCCESS;
+}
+