drm/i915/selftests: Extract spinner code

Pull out spinner code to a standalone file to enable it to be shortly used
by other and new test cases.

Plain code movement - no functional changes.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20181130080254.15383-1-tvrtko.ursulin@linux.intel.com

drivers/gpu/drm/i915/Makefile

@@ -165,7 +165,8 @@ i915-$(CONFIG_DRM_I915_CAPTURE_ERROR) += i915_gpu_error.o
 i915-$(CONFIG_DRM_I915_SELFTEST) += \
 	selftests/i915_random.o \
 	selftests/i915_selftest.o \
-	selftests/igt_flush_test.o
+	selftests/igt_flush_test.o \
+	selftests/igt_spinner.o
 
 # virtual gpu code
 i915-y += i915_vgpu.o

drivers/gpu/drm/i915/selftests/igt_spinner.c

+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2018 Intel Corporation
+ */
+
+#include "igt_spinner.h"
+
+int igt_spinner_init(struct igt_spinner *spin, struct drm_i915_private *i915)
+{
+	unsigned int mode;
+	void *vaddr;
+	int err;
+
+	GEM_BUG_ON(INTEL_GEN(i915) < 8);
+
+	memset(spin, 0, sizeof(*spin));
+	spin->i915 = i915;
+
+	spin->hws = i915_gem_object_create_internal(i915, PAGE_SIZE);
+	if (IS_ERR(spin->hws)) {
+		err = PTR_ERR(spin->hws);
+		goto err;
+	}
+
+	spin->obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
+	if (IS_ERR(spin->obj)) {
+		err = PTR_ERR(spin->obj);
+		goto err_hws;
+	}
+
+	i915_gem_object_set_cache_level(spin->hws, I915_CACHE_LLC);
+	vaddr = i915_gem_object_pin_map(spin->hws, I915_MAP_WB);
+	if (IS_ERR(vaddr)) {
+		err = PTR_ERR(vaddr);
+		goto err_obj;
+	}
+	spin->seqno = memset(vaddr, 0xff, PAGE_SIZE);
+
+	mode = i915_coherent_map_type(i915);
+	vaddr = i915_gem_object_pin_map(spin->obj, mode);
+	if (IS_ERR(vaddr)) {
+		err = PTR_ERR(vaddr);
+		goto err_unpin_hws;
+	}
+	spin->batch = vaddr;
+
+	return 0;
+
+err_unpin_hws:
+	i915_gem_object_unpin_map(spin->hws);
+err_obj:
+	i915_gem_object_put(spin->obj);
+err_hws:
+	i915_gem_object_put(spin->hws);
+err:
+	return err;
+}
+
+static unsigned int seqno_offset(u64 fence)
+{
+	return offset_in_page(sizeof(u32) * fence);
+}
+
+static u64 hws_address(const struct i915_vma *hws,
+		       const struct i915_request *rq)
+{
+	return hws->node.start + seqno_offset(rq->fence.context);
+}
+
+static int emit_recurse_batch(struct igt_spinner *spin,
+			      struct i915_request *rq,
+			      u32 arbitration_command)
+{
+	struct i915_address_space *vm = &rq->gem_context->ppgtt->vm;
+	struct i915_vma *hws, *vma;
+	u32 *batch;
+	int err;
+
+	vma = i915_vma_instance(spin->obj, vm, NULL);
+	if (IS_ERR(vma))
+		return PTR_ERR(vma);
+
+	hws = i915_vma_instance(spin->hws, vm, NULL);
+	if (IS_ERR(hws))
+		return PTR_ERR(hws);
+
+	err = i915_vma_pin(vma, 0, 0, PIN_USER);
+	if (err)
+		return err;
+
+	err = i915_vma_pin(hws, 0, 0, PIN_USER);
+	if (err)
+		goto unpin_vma;
+
+	err = i915_vma_move_to_active(vma, rq, 0);
+	if (err)
+		goto unpin_hws;
+
+	if (!i915_gem_object_has_active_reference(vma->obj)) {
+		i915_gem_object_get(vma->obj);
+		i915_gem_object_set_active_reference(vma->obj);
+	}
+
+	err = i915_vma_move_to_active(hws, rq, 0);
+	if (err)
+		goto unpin_hws;
+
+	if (!i915_gem_object_has_active_reference(hws->obj)) {
+		i915_gem_object_get(hws->obj);
+		i915_gem_object_set_active_reference(hws->obj);
+	}
+
+	batch = spin->batch;
+
+	*batch++ = MI_STORE_DWORD_IMM_GEN4;
+	*batch++ = lower_32_bits(hws_address(hws, rq));
+	*batch++ = upper_32_bits(hws_address(hws, rq));
+	*batch++ = rq->fence.seqno;
+
+	*batch++ = arbitration_command;
+
+	*batch++ = MI_BATCH_BUFFER_START | 1 << 8 | 1;
+	*batch++ = lower_32_bits(vma->node.start);
+	*batch++ = upper_32_bits(vma->node.start);
+	*batch++ = MI_BATCH_BUFFER_END; /* not reached */
+
+	i915_gem_chipset_flush(spin->i915);
+
+	err = rq->engine->emit_bb_start(rq, vma->node.start, PAGE_SIZE, 0);
+
+unpin_hws:
+	i915_vma_unpin(hws);
+unpin_vma:
+	i915_vma_unpin(vma);
+	return err;
+}
+
+struct i915_request *
+igt_spinner_create_request(struct igt_spinner *spin,
+			   struct i915_gem_context *ctx,
+			   struct intel_engine_cs *engine,
+			   u32 arbitration_command)
+{
+	struct i915_request *rq;
+	int err;
+
+	rq = i915_request_alloc(engine, ctx);
+	if (IS_ERR(rq))
+		return rq;
+
+	err = emit_recurse_batch(spin, rq, arbitration_command);
+	if (err) {
+		i915_request_add(rq);
+		return ERR_PTR(err);
+	}
+
+	return rq;
+}
+
+static u32
+hws_seqno(const struct igt_spinner *spin, const struct i915_request *rq)
+{
+	u32 *seqno = spin->seqno + seqno_offset(rq->fence.context);
+
+	return READ_ONCE(*seqno);
+}
+
+void igt_spinner_end(struct igt_spinner *spin)
+{
+	*spin->batch = MI_BATCH_BUFFER_END;
+	i915_gem_chipset_flush(spin->i915);
+}
+
+void igt_spinner_fini(struct igt_spinner *spin)
+{
+	igt_spinner_end(spin);
+
+	i915_gem_object_unpin_map(spin->obj);
+	i915_gem_object_put(spin->obj);
+
+	i915_gem_object_unpin_map(spin->hws);
+	i915_gem_object_put(spin->hws);
+}
+
+bool igt_wait_for_spinner(struct igt_spinner *spin, struct i915_request *rq)
+{
+	if (!wait_event_timeout(rq->execute,
+				READ_ONCE(rq->global_seqno),
+				msecs_to_jiffies(10)))
+		return false;
+
+	return !(wait_for_us(i915_seqno_passed(hws_seqno(spin, rq),
+					       rq->fence.seqno),
+			     10) &&
+		 wait_for(i915_seqno_passed(hws_seqno(spin, rq),
+					    rq->fence.seqno),
+			  1000));
+}

drivers/gpu/drm/i915/selftests/igt_spinner.h

+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2018 Intel Corporation
+ */
+
+#ifndef __I915_SELFTESTS_IGT_SPINNER_H__
+#define __I915_SELFTESTS_IGT_SPINNER_H__
+
+#include "../i915_selftest.h"
+
+#include "../i915_drv.h"
+#include "../i915_request.h"
+#include "../intel_ringbuffer.h"
+#include "../i915_gem_context.h"
+
+struct igt_spinner {
+	struct drm_i915_private *i915;
+	struct drm_i915_gem_object *hws;
+	struct drm_i915_gem_object *obj;
+	u32 *batch;
+	void *seqno;
+};
+
+int igt_spinner_init(struct igt_spinner *spin, struct drm_i915_private *i915);
+void igt_spinner_fini(struct igt_spinner *spin);
+
+struct i915_request *
+igt_spinner_create_request(struct igt_spinner *spin,
+			   struct i915_gem_context *ctx,
+			   struct intel_engine_cs *engine,
+			   u32 arbitration_command);
+void igt_spinner_end(struct igt_spinner *spin);
+
+bool igt_wait_for_spinner(struct igt_spinner *spin, struct i915_request *rq);
+
+#endif