drm/i915/guc: kill the GuC client

We now only use 1 client without any plan to add more. The client is
also only holding information about the WQ and the process desc, so we
can just move those in the intel_guc structure and always use stage_id
0.

v2: fix comment (John)
v3: fix the comment for real, fix kerneldoc
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191205220243.27403-4-daniele.ceraolospurio@intel.com

Documentation/gpu/i915.rst

@@ -466,9 +466,6 @@ GuC-based command submission
 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
    :doc: GuC-based command submission
 
-.. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
-   :internal:
-
 HuC
 ---
 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_huc.c

drivers/gpu/drm/i915/gt/intel_reset.c

@@ -21,6 +21,7 @@
 #include "intel_reset.h"
 
 #include "uc/intel_guc.h"
+#include "uc/intel_guc_submission.h"
 
 #define RESET_MAX_RETRIES 3
 
@@ -1085,6 +1086,7 @@ static inline int intel_gt_reset_engine(struct intel_engine_cs *engine)
 int intel_engine_reset(struct intel_engine_cs *engine, const char *msg)
 {
 	struct intel_gt *gt = engine->gt;
+	bool uses_guc = intel_engine_in_guc_submission_mode(engine);
 	int ret;
 
 	GEM_TRACE("%s flags=%lx\n", engine->name, gt->reset.flags);
@@ -1100,14 +1102,14 @@ int intel_engine_reset(struct intel_engine_cs *engine, const char *msg)
 			   "Resetting %s for %s\n", engine->name, msg);
 	atomic_inc(&engine->i915->gpu_error.reset_engine_count[engine->uabi_class]);
 
-	if (!engine->gt->uc.guc.execbuf_client)
+	if (!uses_guc)
 		ret = intel_gt_reset_engine(engine);
 	else
 		ret = intel_guc_reset_engine(&engine->gt->uc.guc, engine);
 	if (ret) {
 		/* If we fail here, we expect to fallback to a global reset */
 		DRM_DEBUG_DRIVER("%sFailed to reset %s, ret=%d\n",
-				 engine->gt->uc.guc.execbuf_client ? "GuC " : "",
+				 uses_guc ? "GuC " : "",
 				 engine->name, ret);
 		goto out;
 	}

drivers/gpu/drm/i915/gt/uc/intel_guc.h

@@ -46,9 +46,13 @@ struct intel_guc {
 
 	struct i915_vma *stage_desc_pool;
 	void *stage_desc_pool_vaddr;
-	struct ida stage_ids;
 
-	struct intel_guc_client *execbuf_client;
+	struct i915_vma *workqueue;
+	void *workqueue_vaddr;
+	spinlock_t wq_lock;
+
+	struct i915_vma *proc_desc;
+	void *proc_desc_vaddr;
 
 	/* Control params for fw initialization */
 	u32 params[GUC_CTL_MAX_DWORDS];

drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h

@@ -31,7 +31,6 @@
 
 #define GUC_DOORBELL_INVALID		256
 
-#define GUC_PD_SIZE			(PAGE_SIZE)
 #define GUC_WQ_SIZE			(PAGE_SIZE * 2)
 
 /* Work queue item header definitions */

drivers/gpu/drm/i915/gt/uc/intel_guc_submission.h

@@ -6,48 +6,10 @@
 #ifndef _INTEL_GUC_SUBMISSION_H_
 #define _INTEL_GUC_SUBMISSION_H_
 
-#include <linux/spinlock.h>
+#include <linux/types.h>
 
-#include "gt/intel_engine_types.h"
-
-#include "i915_gem.h"
-#include "i915_selftest.h"
-
-struct drm_i915_private;
-
-/*
- * This structure primarily describes the GEM object shared with the GuC.
- * The specs sometimes refer to this object as a "GuC context", but we use
- * the term "client" to avoid confusion with hardware contexts. This
- * GEM object is held for the entire lifetime of our interaction with
- * the GuC, being allocated before the GuC is loaded with its firmware.
- * Because there's no way to update the address used by the GuC after
- * initialisation, the shared object must stay pinned into the GGTT as
- * long as the GuC is in use. We also keep the first page (only) mapped
- * into kernel address space, as it includes shared data that must be
- * updated on every request submission.
- *
- * The single GEM object described here is actually made up of several
- * separate areas, as far as the GuC is concerned. The first page (kept
- * kmap'd) includes the "process descriptor" which holds sequence data for
- * the doorbell, and one cacheline which actually *is* the doorbell; a
- * write to this will "ring the doorbell" (i.e. send an interrupt to the
- * GuC). The subsequent  pages of the client object constitute the work
- * queue (a circular array of work items), again described in the process
- * descriptor. Work queue pages are mapped momentarily as required.
- */
-struct intel_guc_client {
-	struct i915_vma *vma;
-	void *vaddr;
-	struct intel_guc *guc;
-
-	/* bitmap of (host) engine ids */
-	u32 priority;
-	u32 stage_id;
-
-	/* Protects GuC client's WQ access */
-	spinlock_t wq_lock;
-};
+struct intel_guc;
+struct intel_engine_cs;
 
 void intel_guc_submission_init_early(struct intel_guc *guc);
 int intel_guc_submission_init(struct intel_guc *guc);
@@ -56,5 +18,6 @@ void intel_guc_submission_disable(struct intel_guc *guc);
 void intel_guc_submission_fini(struct intel_guc *guc);
 int intel_guc_preempt_work_create(struct intel_guc *guc);
 void intel_guc_preempt_work_destroy(struct intel_guc *guc);
+bool intel_engine_in_guc_submission_mode(const struct intel_engine_cs *engine);
 
 #endif

drivers/gpu/drm/i915/i915_debugfs.c

@@ -1792,23 +1792,12 @@ static void i915_guc_log_info(struct seq_file *m,
 static int i915_guc_info(struct seq_file *m, void *data)
 {
 	struct drm_i915_private *dev_priv = node_to_i915(m->private);
-	const struct intel_guc *guc = &dev_priv->gt.uc.guc;
-	struct intel_guc_client *client = guc->execbuf_client;
 
 	if (!USES_GUC(dev_priv))
 		return -ENODEV;
 
 	i915_guc_log_info(m, dev_priv);
 
-	if (!USES_GUC_SUBMISSION(dev_priv))
-		return 0;
-
-	GEM_BUG_ON(!guc->execbuf_client);
-
-	seq_printf(m, "\nGuC execbuf client @ %p:\n", client);
-	seq_printf(m, "\tPriority %d, GuC stage index: %u\n",
-		   client->priority,
-		   client->stage_id);
 	/* Add more as required ... */
 
 	return 0;