[Intel-gfx] [PATCH 1/2] drm/i915/guc: Add GuC Load time to dmesg log.

[Anusha Srivatsa]

Calculate the time that GuC takes to load using
jiffies. This information could be very useful in
determining if GuC is taking unreasonably long time
to load in a certain platforms.

v2: Calculate time before logs are collected.
Move the guc_load_time variable as a part of
intel_uc_fw struct. Store only final result
which is to be exported to debugfs. (Michal)
Add the load time in the print message as well.

v3: Remove debugfs entry. Remove local variable
guc_finish_load. (Daniel, Tvrtko)

v4: Use ktime_get() instead of jiffies. Use DRM_NOTE
if time taken to load is more than the threshold. On
load times within acceptable range, use DRM_DEBUG_DRIVER
(Tvrtko)

v5: Rebased. Do not expose the load time variable in a global
struct (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 <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_guc_fw.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_guc_fw.c b/drivers/gpu/drm/i915/intel_guc_fw.c
index ef67a36..4ce9a30 100644
--- a/drivers/gpu/drm/i915/intel_guc_fw.c
+++ b/drivers/gpu/drm/i915/intel_guc_fw.c
@@ -133,7 +133,8 @@ static int guc_ucode_xfer_dma(struct drm_i915_private *dev_priv,
 	unsigned long offset;
 	struct sg_table *sg = vma->pages;
 	u32 status, rsa[UOS_RSA_SCRATCH_MAX_COUNT];
-	int i, ret = 0;
+	int i, ret = 0, load_time;
+	ktime_t start_load;
 
 	/* where RSA signature starts */
 	offset = guc_fw->rsa_offset;
@@ -160,6 +161,7 @@ static int guc_ucode_xfer_dma(struct drm_i915_private *dev_priv,
 	I915_WRITE(DMA_ADDR_1_HIGH, DMA_ADDRESS_SPACE_WOPCM);
 
 	/* Finally start the DMA */
+	start_load = ktime_get();
 	I915_WRITE(DMA_CTRL, _MASKED_BIT_ENABLE(UOS_MOVE | START_DMA));
 
 	/*
@@ -172,13 +174,18 @@ static int guc_ucode_xfer_dma(struct drm_i915_private *dev_priv,
 	 */
 	ret = wait_for(guc_ucode_response(dev_priv, &status), 100);
 
+	load_time = ktime_ms_delta(ktime_get(), start_load);
+
 	DRM_DEBUG_DRIVER("DMA status 0x%x, GuC status 0x%x\n",
 			I915_READ(DMA_CTRL), status);
 
 	if ((status & GS_BOOTROM_MASK) == GS_BOOTROM_RSA_FAILED) {
 		DRM_ERROR("GuC firmware signature verification failed\n");
 		ret = -ENOEXEC;
-	}
+	} else if (load_time > 20)
+		DRM_NOTE("GuC load takes more than acceptable threshold\n");
+	else
+		DRM_DEBUG_DRIVER("GuC loaded in %d ms\n", load_time);
 
 	DRM_DEBUG_DRIVER("returning %d\n", ret);
 
-- 
2.7.4