[RFC PATCH 011/162] drm/i915: Pin timeline map after first timeline pin, v5.

[Matthew Auld <matthew.auld@intel.com>]

From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

We're starting to require the reservation lock for pinning,
so wait until we have that.

Update the selftests to handle this correctly, and ensure pin is
called in live_hwsp_rollover_user() and mock_hwsp_freelist().

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reported-by: kernel test robot <lkp@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/i915/gt/intel_timeline.c      | 49 ++++++++++----
 drivers/gpu/drm/i915/gt/intel_timeline.h      |  1 +
 .../gpu/drm/i915/gt/intel_timeline_types.h    |  1 +
 drivers/gpu/drm/i915/gt/mock_engine.c         | 24 ++++++-
 drivers/gpu/drm/i915/gt/selftest_timeline.c   | 64 ++++++++++---------
 drivers/gpu/drm/i915/i915_selftest.h          |  2 +
 6 files changed, 96 insertions(+), 45 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_timeline.c b/drivers/gpu/drm/i915/gt/intel_timeline.c
index a58228d1cd3b..479eb5440bc6 100644
--- a/drivers/gpu/drm/i915/gt/intel_timeline.c
+++ b/drivers/gpu/drm/i915/gt/intel_timeline.c
@@ -229,13 +229,30 @@ static void cacheline_free(struct intel_timeline_cacheline *cl)
 	i915_active_release(&cl->active);
 }
 
+I915_SELFTEST_EXPORT int
+intel_timeline_pin_map(struct intel_timeline *timeline)
+{
+	if (!timeline->hwsp_cacheline) {
+		struct drm_i915_gem_object *obj = timeline->hwsp_ggtt->obj;
+		u32 ofs = offset_in_page(timeline->hwsp_offset);
+		void *vaddr;
+
+		vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB);
+		if (IS_ERR(vaddr))
+			return PTR_ERR(vaddr);
+
+		timeline->hwsp_map = vaddr;
+		timeline->hwsp_seqno = memset(vaddr + ofs, 0, CACHELINE_BYTES);
+	}
+
+	return 0;
+}
+
 static int intel_timeline_init(struct intel_timeline *timeline,
 			       struct intel_gt *gt,
 			       struct i915_vma *hwsp,
 			       unsigned int offset)
 {
-	void *vaddr;
-
 	kref_init(&timeline->kref);
 	atomic_set(&timeline->pin_count, 0);
 
@@ -260,18 +277,15 @@ static int intel_timeline_init(struct intel_timeline *timeline,
 
 		timeline->hwsp_cacheline = cl;
 		timeline->hwsp_offset = cacheline * CACHELINE_BYTES;
-
-		vaddr = page_mask_bits(cl->vaddr);
+		timeline->hwsp_map = page_mask_bits(cl->vaddr);
+		timeline->hwsp_seqno =
+			memset(timeline->hwsp_map + timeline->hwsp_offset, 0,
+			       CACHELINE_BYTES);
 	} else {
 		timeline->hwsp_offset = offset;
-		vaddr = i915_gem_object_pin_map(hwsp->obj, I915_MAP_WB);
-		if (IS_ERR(vaddr))
-			return PTR_ERR(vaddr);
+		timeline->hwsp_map = NULL;
 	}
 
-	timeline->hwsp_seqno =
-		memset(vaddr + timeline->hwsp_offset, 0, CACHELINE_BYTES);
-
 	timeline->hwsp_ggtt = i915_vma_get(hwsp);
 	GEM_BUG_ON(timeline->hwsp_offset >= hwsp->size);
 
@@ -306,7 +320,7 @@ static void intel_timeline_fini(struct intel_timeline *timeline)
 
 	if (timeline->hwsp_cacheline)
 		cacheline_free(timeline->hwsp_cacheline);
-	else
+	else if (timeline->hwsp_map)
 		i915_gem_object_unpin_map(timeline->hwsp_ggtt->obj);
 
 	i915_vma_put(timeline->hwsp_ggtt);
@@ -346,9 +360,18 @@ int intel_timeline_pin(struct intel_timeline *tl, struct i915_gem_ww_ctx *ww)
 	if (atomic_add_unless(&tl->pin_count, 1, 0))
 		return 0;
 
+	if (!tl->hwsp_cacheline) {
+		err = intel_timeline_pin_map(tl);
+		if (err)
+			return err;
+	}
+
 	err = i915_ggtt_pin(tl->hwsp_ggtt, ww, 0, PIN_HIGH);
-	if (err)
+	if (err) {
+		if (!tl->hwsp_cacheline)
+			i915_gem_object_unpin_map(tl->hwsp_ggtt->obj);
 		return err;
+	}
 
 	tl->hwsp_offset =
 		i915_ggtt_offset(tl->hwsp_ggtt) +
@@ -360,6 +383,8 @@ int intel_timeline_pin(struct intel_timeline *tl, struct i915_gem_ww_ctx *ww)
 	if (atomic_fetch_inc(&tl->pin_count)) {
 		cacheline_release(tl->hwsp_cacheline);
 		__i915_vma_unpin(tl->hwsp_ggtt);
+		if (!tl->hwsp_cacheline)
+			i915_gem_object_unpin_map(tl->hwsp_ggtt->obj);
 	}
 
 	return 0;
diff --git a/drivers/gpu/drm/i915/gt/intel_timeline.h b/drivers/gpu/drm/i915/gt/intel_timeline.h
index 634acebd0c4b..725bae16237c 100644
--- a/drivers/gpu/drm/i915/gt/intel_timeline.h
+++ b/drivers/gpu/drm/i915/gt/intel_timeline.h
@@ -114,5 +114,6 @@ void intel_gt_show_timelines(struct intel_gt *gt,
 						  const struct i915_request *rq,
 						  const char *prefix,
 						  int indent));
+I915_SELFTEST_DECLARE(int intel_timeline_pin_map(struct intel_timeline *tl));
 
 #endif
diff --git a/drivers/gpu/drm/i915/gt/intel_timeline_types.h b/drivers/gpu/drm/i915/gt/intel_timeline_types.h
index 4474f487f589..cac7fa3dfd43 100644
--- a/drivers/gpu/drm/i915/gt/intel_timeline_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_timeline_types.h
@@ -45,6 +45,7 @@ struct intel_timeline {
 	atomic_t pin_count;
 	atomic_t active_count;
 
+	void *hwsp_map;
 	const u32 *hwsp_seqno;
 	struct i915_vma *hwsp_ggtt;
 	u32 hwsp_offset;
diff --git a/drivers/gpu/drm/i915/gt/mock_engine.c b/drivers/gpu/drm/i915/gt/mock_engine.c
index 2f830017c51d..016f4f345706 100644
--- a/drivers/gpu/drm/i915/gt/mock_engine.c
+++ b/drivers/gpu/drm/i915/gt/mock_engine.c
@@ -32,9 +32,22 @@
 #include "mock_engine.h"
 #include "selftests/mock_request.h"
 
-static void mock_timeline_pin(struct intel_timeline *tl)
+static int mock_timeline_pin(struct intel_timeline *tl)
 {
+	int err;
+
+	if (!tl->hwsp_cacheline) {
+		if (WARN_ON(!i915_gem_object_trylock(tl->hwsp_ggtt->obj)))
+			return -EBUSY;
+
+		err = intel_timeline_pin_map(tl);
+		i915_gem_object_unlock(tl->hwsp_ggtt->obj);
+		if (err)
+			return err;
+	}
+
 	atomic_inc(&tl->pin_count);
+	return 0;
 }
 
 static void mock_timeline_unpin(struct intel_timeline *tl)
@@ -152,6 +165,8 @@ static void mock_context_destroy(struct kref *ref)
 
 static int mock_context_alloc(struct intel_context *ce)
 {
+	int err;
+
 	ce->ring = mock_ring(ce->engine);
 	if (!ce->ring)
 		return -ENOMEM;
@@ -162,7 +177,12 @@ static int mock_context_alloc(struct intel_context *ce)
 		return PTR_ERR(ce->timeline);
 	}
 
-	mock_timeline_pin(ce->timeline);
+	err = mock_timeline_pin(ce->timeline);
+	if (err) {
+		intel_timeline_put(ce->timeline);
+		ce->timeline = NULL;
+		return err;
+	}
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/i915/gt/selftest_timeline.c b/drivers/gpu/drm/i915/gt/selftest_timeline.c
index fa3fec049542..7435abf5a703 100644
--- a/drivers/gpu/drm/i915/gt/selftest_timeline.c
+++ b/drivers/gpu/drm/i915/gt/selftest_timeline.c
@@ -34,7 +34,7 @@ static unsigned long hwsp_cacheline(struct intel_timeline *tl)
 {
 	unsigned long address = (unsigned long)page_address(hwsp_page(tl));
 
-	return (address + tl->hwsp_offset) / CACHELINE_BYTES;
+	return (address + offset_in_page(tl->hwsp_offset)) / CACHELINE_BYTES;
 }
 
 #define CACHELINES_PER_PAGE (PAGE_SIZE / CACHELINE_BYTES)
@@ -58,6 +58,7 @@ static void __mock_hwsp_record(struct mock_hwsp_freelist *state,
 	tl = xchg(&state->history[idx], tl);
 	if (tl) {
 		radix_tree_delete(&state->cachelines, hwsp_cacheline(tl));
+		intel_timeline_unpin(tl);
 		intel_timeline_put(tl);
 	}
 }
@@ -77,6 +78,12 @@ static int __mock_hwsp_timeline(struct mock_hwsp_freelist *state,
 		if (IS_ERR(tl))
 			return PTR_ERR(tl);
 
+		err = intel_timeline_pin(tl, NULL);
+		if (err) {
+			intel_timeline_put(tl);
+			return err;
+		}
+
 		cacheline = hwsp_cacheline(tl);
 		err = radix_tree_insert(&state->cachelines, cacheline, tl);
 		if (err) {
@@ -84,6 +91,7 @@ static int __mock_hwsp_timeline(struct mock_hwsp_freelist *state,
 				pr_err("HWSP cacheline %lu already used; duplicate allocation!\n",
 				       cacheline);
 			}
+			intel_timeline_unpin(tl);
 			intel_timeline_put(tl);
 			return err;
 		}
@@ -451,7 +459,7 @@ static int emit_ggtt_store_dw(struct i915_request *rq, u32 addr, u32 value)
 }
 
 static struct i915_request *
-tl_write(struct intel_timeline *tl, struct intel_engine_cs *engine, u32 value)
+checked_tl_write(struct intel_timeline *tl, struct intel_engine_cs *engine, u32 value)
 {
 	struct i915_request *rq;
 	int err;
@@ -462,6 +470,13 @@ tl_write(struct intel_timeline *tl, struct intel_engine_cs *engine, u32 value)
 		goto out;
 	}
 
+	if (READ_ONCE(*tl->hwsp_seqno) != tl->seqno) {
+		pr_err("Timeline created with incorrect breadcrumb, found %x, expected %x\n",
+		       *tl->hwsp_seqno, tl->seqno);
+		intel_timeline_unpin(tl);
+		return ERR_PTR(-EINVAL);
+	}
+
 	rq = intel_engine_create_kernel_request(engine);
 	if (IS_ERR(rq))
 		goto out_unpin;
@@ -483,25 +498,6 @@ tl_write(struct intel_timeline *tl, struct intel_engine_cs *engine, u32 value)
 	return rq;
 }
 
-static struct intel_timeline *
-checked_intel_timeline_create(struct intel_gt *gt)
-{
-	struct intel_timeline *tl;
-
-	tl = intel_timeline_create(gt);
-	if (IS_ERR(tl))
-		return tl;
-
-	if (READ_ONCE(*tl->hwsp_seqno) != tl->seqno) {
-		pr_err("Timeline created with incorrect breadcrumb, found %x, expected %x\n",
-		       *tl->hwsp_seqno, tl->seqno);
-		intel_timeline_put(tl);
-		return ERR_PTR(-EINVAL);
-	}
-
-	return tl;
-}
-
 static int live_hwsp_engine(void *arg)
 {
 #define NUM_TIMELINES 4096
@@ -534,13 +530,13 @@ static int live_hwsp_engine(void *arg)
 			struct intel_timeline *tl;
 			struct i915_request *rq;
 
-			tl = checked_intel_timeline_create(gt);
+			tl = intel_timeline_create(gt);
 			if (IS_ERR(tl)) {
 				err = PTR_ERR(tl);
 				break;
 			}
 
-			rq = tl_write(tl, engine, count);
+			rq = checked_tl_write(tl, engine, count);
 			if (IS_ERR(rq)) {
 				intel_timeline_put(tl);
 				err = PTR_ERR(rq);
@@ -607,14 +603,14 @@ static int live_hwsp_alternate(void *arg)
 			if (!intel_engine_can_store_dword(engine))
 				continue;
 
-			tl = checked_intel_timeline_create(gt);
+			tl = intel_timeline_create(gt);
 			if (IS_ERR(tl)) {
 				err = PTR_ERR(tl);
 				goto out;
 			}
 
 			intel_engine_pm_get(engine);
-			rq = tl_write(tl, engine, count);
+			rq = checked_tl_write(tl, engine, count);
 			intel_engine_pm_put(engine);
 			if (IS_ERR(rq)) {
 				intel_timeline_put(tl);
@@ -1239,8 +1235,13 @@ static int live_hwsp_rollover_user(void *arg)
 		if (!tl->has_initial_breadcrumb || !tl->hwsp_cacheline)
 			goto out;
 
+		err = intel_context_pin(ce);
+		if (err)
+			goto out;
+
 		timeline_rollback(tl);
 		timeline_rollback(tl);
+
 		WRITE_ONCE(*(u32 *)tl->hwsp_seqno, tl->seqno);
 
 		for (i = 0; i < ARRAY_SIZE(rq); i++) {
@@ -1249,7 +1250,7 @@ static int live_hwsp_rollover_user(void *arg)
 			this = intel_context_create_request(ce);
 			if (IS_ERR(this)) {
 				err = PTR_ERR(this);
-				goto out;
+				goto out_unpin;
 			}
 
 			pr_debug("%s: create fence.seqnp:%d\n",
@@ -1268,17 +1269,18 @@ static int live_hwsp_rollover_user(void *arg)
 		if (i915_request_wait(rq[2], 0, HZ / 5) < 0) {
 			pr_err("Wait for timeline wrap timed out!\n");
 			err = -EIO;
-			goto out;
+			goto out_unpin;
 		}
 
 		for (i = 0; i < ARRAY_SIZE(rq); i++) {
 			if (!i915_request_completed(rq[i])) {
 				pr_err("Pre-wrap request not completed!\n");
 				err = -EINVAL;
-				goto out;
+				goto out_unpin;
 			}
 		}
-
+out_unpin:
+		intel_context_unpin(ce);
 out:
 		for (i = 0; i < ARRAY_SIZE(rq); i++)
 			i915_request_put(rq[i]);
@@ -1320,13 +1322,13 @@ static int live_hwsp_recycle(void *arg)
 			struct intel_timeline *tl;
 			struct i915_request *rq;
 
-			tl = checked_intel_timeline_create(gt);
+			tl = intel_timeline_create(gt);
 			if (IS_ERR(tl)) {
 				err = PTR_ERR(tl);
 				break;
 			}
 
-			rq = tl_write(tl, engine, count);
+			rq = checked_tl_write(tl, engine, count);
 			if (IS_ERR(rq)) {
 				intel_timeline_put(tl);
 				err = PTR_ERR(rq);
diff --git a/drivers/gpu/drm/i915/i915_selftest.h b/drivers/gpu/drm/i915/i915_selftest.h
index d53d207ab6eb..f54de0499be7 100644
--- a/drivers/gpu/drm/i915/i915_selftest.h
+++ b/drivers/gpu/drm/i915/i915_selftest.h
@@ -107,6 +107,7 @@ int __i915_subtests(const char *caller,
 
 #define I915_SELFTEST_DECLARE(x) x
 #define I915_SELFTEST_ONLY(x) unlikely(x)
+#define I915_SELFTEST_EXPORT
 
 #else /* !IS_ENABLED(CONFIG_DRM_I915_SELFTEST) */
 
@@ -116,6 +117,7 @@ static inline int i915_perf_selftests(struct pci_dev *pdev) { return 0; }
 
 #define I915_SELFTEST_DECLARE(x)
 #define I915_SELFTEST_ONLY(x) 0
+#define I915_SELFTEST_EXPORT static
 
 #endif
 
-- 
2.26.2

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