[Intel-gfx] [PATCH 2/2] drm/i915/huc: Add HuC Load time to dmesg log.

[Anusha Srivatsa]

This patch uses jiffies to calculate the huc
load time.This information can be useful for testing
to know how much time huc takes to load.

v2: Remove debugfs entry. Remove local variable
huc_finish_load. (Daniel, Tvrtko)

v3: Use ktime_get() for more accurate timings.
Ensure the load is successful, before load times
is printed. (Tvrtko, Michal)

v4: Rebase. Do not expose the load time variable in a gobal
struct. Use int for load time (Tvrtko, Joonas)

Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Oscar Mateo Lozano <oscar.mateo at intel.com>
Cc: Sujaritha Sundaresan <sujaritha.sundaresan at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
---
 drivers/gpu/drm/i915/intel_huc.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_huc.c b/drivers/gpu/drm/i915/intel_huc.c
index 98d1725..3e3ce14 100644
--- a/drivers/gpu/drm/i915/intel_huc.c
+++ b/drivers/gpu/drm/i915/intel_huc.c
@@ -127,7 +127,8 @@ static int huc_ucode_xfer(struct intel_uc_fw *huc_fw, struct i915_vma *vma)
 	struct drm_i915_private *dev_priv = huc_to_i915(huc);
 	unsigned long offset = 0;
 	u32 size;
-	int ret;
+	int ret, load_time;
+	ktime_t start_load;
 
 	GEM_BUG_ON(huc_fw->type != INTEL_UC_FW_TYPE_HUC);
 
@@ -148,13 +149,19 @@ static int huc_ucode_xfer(struct intel_uc_fw *huc_fw, struct i915_vma *vma)
 	I915_WRITE(DMA_COPY_SIZE, size);
 
 	/* Start the DMA */
+	start_load = ktime_get();
 	I915_WRITE(DMA_CTRL, _MASKED_BIT_ENABLE(HUC_UKERNEL | START_DMA));
 
 	/* Wait for DMA to finish */
 	ret = intel_wait_for_register_fw(dev_priv, DMA_CTRL, START_DMA, 0, 100);
 
+	load_time = ktime_ms_delta(ktime_get(), start_load);
+
 	DRM_DEBUG_DRIVER("HuC DMA transfer wait over with ret %d\n", ret);
 
+	if (!ret)
+		DRM_DEBUG_DRIVER("HuC is loaded in %d ms\n", load_time);
+
 	/* Disable the bits once DMA is over */
 	I915_WRITE(DMA_CTRL, _MASKED_BIT_DISABLE(HUC_UKERNEL));
 
-- 
2.7.4