drm/radeon/kms: implement timestamp userspace query (v2)

[linux-2.6-block.git] / drivers / gpu / drm / radeon / r600.c

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 637280f541a38492e8a0289e209285e0bb518aaf..d79c639ae739cf68a35039d4ca94357d423c534a 100644 (file)
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -3789,3 +3789,23 @@ static void r600_pcie_gen2_enable(struct radeon_device *rdev)
                WREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL, link_width_cntl);
        }
 }
+
+/**
+ * r600_get_gpu_clock - return GPU clock counter snapshot
+ *
+ * @rdev: radeon_device pointer
+ *
+ * Fetches a GPU clock counter snapshot (R6xx-cayman).
+ * Returns the 64 bit clock counter snapshot.
+ */
+uint64_t r600_get_gpu_clock(struct radeon_device *rdev)
+{
+       uint64_t clock;
+
+       mutex_lock(&rdev->gpu_clock_mutex);
+       WREG32(RLC_CAPTURE_GPU_CLOCK_COUNT, 1);
+       clock = (uint64_t)RREG32(RLC_GPU_CLOCK_COUNT_LSB) |
+               ((uint64_t)RREG32(RLC_GPU_CLOCK_COUNT_MSB) << 32ULL);
+       mutex_unlock(&rdev->gpu_clock_mutex);
+       return clock;
+}