Re: [PATCH 02/15] drm/i915/guc: Prepare send() function to accept bigger response

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On 8/4/2017 9:26 AM, Michal Wajdeczko wrote:
This is a preparation step for the upcoming patches.
We already can return some small data decoded from the command
status, but we will need more in the future.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
Cc: Oscar Mateo <oscar.mateo@xxxxxxxxx>
Cc: Michel Thierry <michel.thierry@xxxxxxxxx>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
---
  drivers/gpu/drm/i915/intel_guc_ct.c | 7 ++++---
  drivers/gpu/drm/i915/intel_uc.c     | 6 ++++--
  drivers/gpu/drm/i915/intel_uc.h     | 8 ++++----
  3 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_guc_ct.c b/drivers/gpu/drm/i915/intel_guc_ct.c
index 1249868..c17cb42 100644
--- a/drivers/gpu/drm/i915/intel_guc_ct.c
+++ b/drivers/gpu/drm/i915/intel_guc_ct.c
@@ -79,7 +79,7 @@ static int guc_action_register_ct_buffer(struct intel_guc *guc,
  	int err;
/* Can't use generic send(), CT registration must go over MMIO */
-	err = intel_guc_send_mmio(guc, action, ARRAY_SIZE(action));
+	err = intel_guc_send_mmio(guc, action, ARRAY_SIZE(action), NULL);
  	if (err)

another one that is only checking for diff 0 (re prev patch), I know the h2g register-ct cmd shouldn't be returning any positive value though.

  		DRM_ERROR("CT: register %s buffer failed; err=%d\n",
  			  guc_ct_buffer_type_to_str(type), err);
@@ -98,7 +98,7 @@ static int guc_action_deregister_ct_buffer(struct intel_guc *guc,
  	int err;
/* Can't use generic send(), CT deregistration must go over MMIO */
-	err = intel_guc_send_mmio(guc, action, ARRAY_SIZE(action));
+	err = intel_guc_send_mmio(guc, action, ARRAY_SIZE(action), NULL);
  	if (err)
  		DRM_ERROR("CT: deregister %s buffer failed; owner=%d err=%d\n",
  			  guc_ct_buffer_type_to_str(type), owner, err);
@@ -395,7 +395,8 @@ static int ctch_send(struct intel_guc *guc,
  /*
   * Command Transport (CT) buffer based GuC send function.
   */
-static int intel_guc_send_ct(struct intel_guc *guc, const u32 *action, u32 len)
+static int intel_guc_send_ct(struct intel_guc *guc, const u32 *action, u32 len,
+			     u32 *response)
  {
  	struct intel_guc_ct_channel *ctch = &guc->ct.host_channel;
  	u32 status = ~0; /* undefined */
diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index ff25477..77da750 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -459,7 +459,8 @@ void intel_uc_fini_hw(struct drm_i915_private *dev_priv)
  	i915_ggtt_disable_guc(dev_priv);
  }
-int intel_guc_send_nop(struct intel_guc *guc, const u32 *action, u32 len)
+int intel_guc_send_nop(struct intel_guc *guc, const u32 *action, u32 len,
+		       u32 *response)
  {
  	WARN(1, "Unexpected send: action=%#x\n", *action);
  	return -ENODEV;
@@ -468,7 +469,8 @@ int intel_guc_send_nop(struct intel_guc *guc, const u32 *action, u32 len)
  /*
   * This function implements the MMIO based host to GuC interface.
   */
-int intel_guc_send_mmio(struct intel_guc *guc, const u32 *action, u32 len)
+int intel_guc_send_mmio(struct intel_guc *guc, const u32 *action, u32 len,
+			u32 *response)
  {
  	struct drm_i915_private *dev_priv = guc_to_i915(guc);
  	u32 status;
diff --git a/drivers/gpu/drm/i915/intel_uc.h b/drivers/gpu/drm/i915/intel_uc.h
index 22ae52b..53ea5f1 100644
--- a/drivers/gpu/drm/i915/intel_uc.h
+++ b/drivers/gpu/drm/i915/intel_uc.h
@@ -206,7 +206,7 @@ struct intel_guc {
  	struct mutex send_mutex;
/* GuC's FW specific send function */
-	int (*send)(struct intel_guc *guc, const u32 *data, u32 len);
+	int (*send)(struct intel_guc *guc, const u32 *data, u32 len, u32 *resp);
/* GuC's FW specific notify function */
  	void (*notify)(struct intel_guc *guc);
@@ -227,12 +227,12 @@ void intel_uc_fini_fw(struct drm_i915_private *dev_priv);
  int intel_uc_init_hw(struct drm_i915_private *dev_priv);
  void intel_uc_fini_hw(struct drm_i915_private *dev_priv);
  int intel_guc_sample_forcewake(struct intel_guc *guc);
-int intel_guc_send_nop(struct intel_guc *guc, const u32 *action, u32 len);
-int intel_guc_send_mmio(struct intel_guc *guc, const u32 *action, u32 len);
+int intel_guc_send_nop(struct intel_guc *guc, const u32 *action, u32 len, u32 *response);
+int intel_guc_send_mmio(struct intel_guc *guc, const u32 *action, u32 len, u32 *response);
static inline int intel_guc_send(struct intel_guc *guc, const u32 *action, u32 len)
  {
-	return guc->send(guc, action, len);
+	return guc->send(guc, action, len, NULL);
  }
static inline void intel_guc_notify(struct intel_guc *guc)


Reviewed-by: Michel Thierry <michel.thierry@xxxxxxxxx>
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