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Commit 1b36595f authored by Chris Wilson's avatar Chris Wilson
Browse files

drm/i915: Show RING registers through debugfs 



Knowing where the RINGs are pointing is extremely useful in diagnosing
if the engines are executing the ringbuffers you expect - and igt may be
suppressing the usual method of looking in the GPU error state.

Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: default avatarMika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161004201132.21801-7-chris@chris-wilson.co.uk
parent cdb324bd

drivers/gpu/drm/i915/i915_debugfs.c

+147 −92
Original line number Diff line number Diff line
@@ -645,6 +645,23 @@ static int i915_gem_batch_pool_info(struct seq_file *m, void *data) 
	return 0;

}



static void print_request(struct seq_file *m,

			  struct drm_i915_gem_request *rq,

			  const char *prefix)

{

	struct pid *pid = rq->ctx->pid;

	struct task_struct *task;



	rcu_read_lock();

	task = pid ? pid_task(pid, PIDTYPE_PID) : NULL;

	seq_printf(m, "%s%x [%x:%x] @ %d: %s [%d]\n", prefix,

		   rq->fence.seqno, rq->ctx->hw_id, rq->fence.seqno,

		   jiffies_to_msecs(jiffies - rq->emitted_jiffies),

		   task ? task->comm : "<unknown>",

		   task ? task->pid : -1);

	rcu_read_unlock();

}



static int i915_gem_request_info(struct seq_file *m, void *data)

{

	struct drm_i915_private *dev_priv = node_to_i915(m->private);
@@ -668,19 +685,8 @@ static int i915_gem_request_info(struct seq_file *m, void *data) 
			continue;



		seq_printf(m, "%s requests: %d\n", engine->name, count);

		list_for_each_entry(req, &engine->request_list, link) {

			struct pid *pid = req->ctx->pid;

			struct task_struct *task;



			rcu_read_lock();

			task = pid ? pid_task(pid, PIDTYPE_PID) : NULL;

			seq_printf(m, "    %x @ %d: %s [%d]\n",

				   req->fence.seqno,

				   (int) (jiffies - req->emitted_jiffies),

				   task ? task->comm : "<unknown>",

				   task ? task->pid : -1);

			rcu_read_unlock();

		}

		list_for_each_entry(req, &engine->request_list, link)

			print_request(m, req, "    ");



		any++;

	}
@@ -2046,84 +2052,6 @@ static int i915_dump_lrc(struct seq_file *m, void *unused) 
	return 0;

}



static int i915_execlists(struct seq_file *m, void *data)

{

	struct drm_i915_private *dev_priv = node_to_i915(m->private);

	struct drm_device *dev = &dev_priv->drm;

	struct intel_engine_cs *engine;

	u32 status_pointer;

	u8 read_pointer;

	u8 write_pointer;

	u32 status;

	u32 ctx_id;

	struct list_head *cursor;

	int i, ret;



	if (!i915.enable_execlists) {

		seq_puts(m, "Logical Ring Contexts are disabled\n");

		return 0;

	}



	ret = mutex_lock_interruptible(&dev->struct_mutex);

	if (ret)

		return ret;



	intel_runtime_pm_get(dev_priv);



	for_each_engine(engine, dev_priv) {

		struct drm_i915_gem_request *head_req = NULL;

		int count = 0;



		seq_printf(m, "%s\n", engine->name);



		status = I915_READ(RING_EXECLIST_STATUS_LO(engine));

		ctx_id = I915_READ(RING_EXECLIST_STATUS_HI(engine));

		seq_printf(m, "\tExeclist status: 0x%08X, context: %u\n",

			   status, ctx_id);



		status_pointer = I915_READ(RING_CONTEXT_STATUS_PTR(engine));

		seq_printf(m, "\tStatus pointer: 0x%08X\n", status_pointer);



		read_pointer = GEN8_CSB_READ_PTR(status_pointer);

		write_pointer = GEN8_CSB_WRITE_PTR(status_pointer);

		if (read_pointer > write_pointer)

			write_pointer += GEN8_CSB_ENTRIES;

		seq_printf(m, "\tRead pointer: 0x%08X, write pointer 0x%08X\n",

			   read_pointer, write_pointer);



		for (i = 0; i < GEN8_CSB_ENTRIES; i++) {

			status = I915_READ(RING_CONTEXT_STATUS_BUF_LO(engine, i));

			ctx_id = I915_READ(RING_CONTEXT_STATUS_BUF_HI(engine, i));



			seq_printf(m, "\tStatus buffer %d: 0x%08X, context: %u\n",

				   i, status, ctx_id);

		}



		spin_lock_bh(&engine->execlist_lock);

		list_for_each(cursor, &engine->execlist_queue)

			count++;

		head_req = list_first_entry_or_null(&engine->execlist_queue,

						    struct drm_i915_gem_request,

						    execlist_link);

		spin_unlock_bh(&engine->execlist_lock);



		seq_printf(m, "\t%d requests in queue\n", count);

		if (head_req) {

			seq_printf(m, "\tHead request context: %u\n",

				   head_req->ctx->hw_id);

			seq_printf(m, "\tHead request tail: %u\n",

				   head_req->tail);

		}



		seq_putc(m, '\n');

	}



	intel_runtime_pm_put(dev_priv);

	mutex_unlock(&dev->struct_mutex);



	return 0;

}



static const char *swizzle_string(unsigned swizzle)

{

	switch (swizzle) {
@@ -3136,6 +3064,133 @@ static int i915_display_info(struct seq_file *m, void *unused) 
	return 0;

}



static int i915_engine_info(struct seq_file *m, void *unused)

{

	struct drm_i915_private *dev_priv = node_to_i915(m->private);

	struct intel_engine_cs *engine;



	for_each_engine(engine, dev_priv) {

		struct intel_breadcrumbs *b = &engine->breadcrumbs;

		struct drm_i915_gem_request *rq;

		struct rb_node *rb;

		u64 addr;



		seq_printf(m, "%s\n", engine->name);

		seq_printf(m, "\tcurrent seqno %x, last %x, hangcheck %x [score %d]\n",

			   intel_engine_get_seqno(engine),

			   engine->last_submitted_seqno,

			   engine->hangcheck.seqno,

			   engine->hangcheck.score);



		rcu_read_lock();



		seq_printf(m, "\tRequests:\n");



		rq = list_first_entry(&engine->request_list,

				struct drm_i915_gem_request, link);

		if (&rq->link != &engine->request_list)

			print_request(m, rq, "\t\tfirst  ");



		rq = list_last_entry(&engine->request_list,

				struct drm_i915_gem_request, link);

		if (&rq->link != &engine->request_list)

			print_request(m, rq, "\t\tlast   ");



		rq = i915_gem_find_active_request(engine);

		if (rq) {

			print_request(m, rq, "\t\tactive ");

			seq_printf(m,

				   "\t\t[head %04x, postfix %04x, tail %04x, batch 0x%08x_%08x]\n",

				   rq->head, rq->postfix, rq->tail,

				   rq->batch ? upper_32_bits(rq->batch->node.start) : ~0u,

				   rq->batch ? lower_32_bits(rq->batch->node.start) : ~0u);

		}



		seq_printf(m, "\tRING_START: 0x%08x [0x%08x]\n",

			   I915_READ(RING_START(engine->mmio_base)),

			   rq ? i915_ggtt_offset(rq->ring->vma) : 0);

		seq_printf(m, "\tRING_HEAD:  0x%08x [0x%08x]\n",

			   I915_READ(RING_HEAD(engine->mmio_base)) & HEAD_ADDR,

			   rq ? rq->ring->head : 0);

		seq_printf(m, "\tRING_TAIL:  0x%08x [0x%08x]\n",

			   I915_READ(RING_TAIL(engine->mmio_base)) & TAIL_ADDR,

			   rq ? rq->ring->tail : 0);

		seq_printf(m, "\tRING_CTL:   0x%08x [%s]\n",

			   I915_READ(RING_CTL(engine->mmio_base)),

			   I915_READ(RING_CTL(engine->mmio_base)) & (RING_WAIT | RING_WAIT_SEMAPHORE) ? "waiting" : "");



		rcu_read_unlock();



		addr = intel_engine_get_active_head(engine);

		seq_printf(m, "\tACTHD:  0x%08x_%08x\n",

			   upper_32_bits(addr), lower_32_bits(addr));

		addr = intel_engine_get_last_batch_head(engine);

		seq_printf(m, "\tBBADDR: 0x%08x_%08x\n",

			   upper_32_bits(addr), lower_32_bits(addr));



		if (i915.enable_execlists) {

			u32 ptr, read, write;



			seq_printf(m, "\tExeclist status: 0x%08x %08x\n",

				   I915_READ(RING_EXECLIST_STATUS_LO(engine)),

				   I915_READ(RING_EXECLIST_STATUS_HI(engine)));



			ptr = I915_READ(RING_CONTEXT_STATUS_PTR(engine));

			read = GEN8_CSB_READ_PTR(ptr);

			write = GEN8_CSB_WRITE_PTR(ptr);

			seq_printf(m, "\tExeclist CSB read %d, write %d\n",

				   read, write);

			if (read >= GEN8_CSB_ENTRIES)

				read = 0;

			if (write >= GEN8_CSB_ENTRIES)

				write = 0;

			if (read > write)

				write += GEN8_CSB_ENTRIES;

			while (read < write) {

				unsigned int idx = ++read % GEN8_CSB_ENTRIES;



				seq_printf(m, "\tExeclist CSB[%d]: 0x%08x, context: %d\n",

					   idx,

					   I915_READ(RING_CONTEXT_STATUS_BUF_LO(engine, idx)),

					   I915_READ(RING_CONTEXT_STATUS_BUF_HI(engine, idx)));

			}



			rcu_read_lock();

			rq = READ_ONCE(engine->execlist_port[0].request);

			if (rq)

				print_request(m, rq, "\t\tELSP[0] ");

			else

				seq_printf(m, "\t\tELSP[0] idle\n");

			rq = READ_ONCE(engine->execlist_port[1].request);

			if (rq)

				print_request(m, rq, "\t\tELSP[1] ");

			else

				seq_printf(m, "\t\tELSP[1] idle\n");

			rcu_read_unlock();

		} else if (INTEL_GEN(dev_priv) > 6) {

			seq_printf(m, "\tPP_DIR_BASE: 0x%08x\n",

				   I915_READ(RING_PP_DIR_BASE(engine)));

			seq_printf(m, "\tPP_DIR_BASE_READ: 0x%08x\n",

				   I915_READ(RING_PP_DIR_BASE_READ(engine)));

			seq_printf(m, "\tPP_DIR_DCLV: 0x%08x\n",

				   I915_READ(RING_PP_DIR_DCLV(engine)));

		}



		spin_lock(&b->lock);

		for (rb = rb_first(&b->waiters); rb; rb = rb_next(rb)) {

			struct intel_wait *w = container_of(rb, typeof(*w), node);



			seq_printf(m, "\t%s [%d] waiting for %x\n",

				   w->tsk->comm, w->tsk->pid, w->seqno);

		}

		spin_unlock(&b->lock);



		seq_puts(m, "\n");

	}



	return 0;

}



static int i915_semaphore_status(struct seq_file *m, void *unused)

{

	struct drm_i915_private *dev_priv = node_to_i915(m->private);
@@ -5290,7 +5345,6 @@ static const struct drm_info_list i915_debugfs_list[] = { 
	{"i915_gem_framebuffer", i915_gem_framebuffer_info, 0},

	{"i915_context_status", i915_context_status, 0},

	{"i915_dump_lrc", i915_dump_lrc, 0},

	{"i915_execlists", i915_execlists, 0},

	{"i915_forcewake_domains", i915_forcewake_domains, 0},

	{"i915_swizzle_info", i915_swizzle_info, 0},

	{"i915_ppgtt_info", i915_ppgtt_info, 0},
@@ -5302,6 +5356,7 @@ static const struct drm_info_list i915_debugfs_list[] = { 
	{"i915_power_domain_info", i915_power_domain_info, 0},

	{"i915_dmc_info", i915_dmc_info, 0},

	{"i915_display_info", i915_display_info, 0},

	{"i915_engine_info", i915_engine_info, 0},

	{"i915_semaphore_status", i915_semaphore_status, 0},

	{"i915_shared_dplls_info", i915_shared_dplls_info, 0},

	{"i915_dp_mst_info", i915_dp_mst_info, 0},

drivers/gpu/drm/i915/intel_engine_cs.c

+30 −0
Original line number Diff line number Diff line
@@ -334,3 +334,33 @@ void intel_engine_cleanup_common(struct intel_engine_cs *engine) 
	intel_engine_cleanup_cmd_parser(engine);

	i915_gem_batch_pool_fini(&engine->batch_pool);

}



u64 intel_engine_get_active_head(struct intel_engine_cs *engine)

{

	struct drm_i915_private *dev_priv = engine->i915;

	u64 acthd;



	if (INTEL_GEN(dev_priv) >= 8)

		acthd = I915_READ64_2x32(RING_ACTHD(engine->mmio_base),

					 RING_ACTHD_UDW(engine->mmio_base));

	else if (INTEL_GEN(dev_priv) >= 4)

		acthd = I915_READ(RING_ACTHD(engine->mmio_base));

	else

		acthd = I915_READ(ACTHD);



	return acthd;

}



u64 intel_engine_get_last_batch_head(struct intel_engine_cs *engine)

{

	struct drm_i915_private *dev_priv = engine->i915;

	u64 bbaddr;



	if (INTEL_GEN(dev_priv) >= 8)

		bbaddr = I915_READ64_2x32(RING_BBADDR(engine->mmio_base),

					  RING_BBADDR_UDW(engine->mmio_base));

	else

		bbaddr = I915_READ(RING_BBADDR(engine->mmio_base));



	return bbaddr;

}

drivers/gpu/drm/i915/intel_ringbuffer.c

+0 −16
Original line number Diff line number Diff line
@@ -405,22 +405,6 @@ gen8_render_ring_flush(struct drm_i915_gem_request *req, u32 mode) 
	return gen8_emit_pipe_control(req, flags, scratch_addr);

}



u64 intel_engine_get_active_head(struct intel_engine_cs *engine)

{

	struct drm_i915_private *dev_priv = engine->i915;

	u64 acthd;



	if (INTEL_GEN(dev_priv) >= 8)

		acthd = I915_READ64_2x32(RING_ACTHD(engine->mmio_base),

					 RING_ACTHD_UDW(engine->mmio_base));

	else if (INTEL_GEN(dev_priv) >= 4)

		acthd = I915_READ(RING_ACTHD(engine->mmio_base));

	else

		acthd = I915_READ(ACTHD);



	return acthd;

}



static void ring_setup_phys_status_page(struct intel_engine_cs *engine)

{

	struct drm_i915_private *dev_priv = engine->i915;

drivers/gpu/drm/i915/intel_ringbuffer.h

+2 −0
Original line number Diff line number Diff line
@@ -541,6 +541,8 @@ int intel_init_blt_ring_buffer(struct intel_engine_cs *engine); 
int intel_init_vebox_ring_buffer(struct intel_engine_cs *engine);



u64 intel_engine_get_active_head(struct intel_engine_cs *engine);

u64 intel_engine_get_last_batch_head(struct intel_engine_cs *engine);



static inline u32 intel_engine_get_seqno(struct intel_engine_cs *engine)

{

	return intel_read_status_page(engine, I915_GEM_HWS_INDEX);