linux-kernel - [PATCH v11 07/10] drm/i915/ttm: add buffer pin on alloc flag

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Message-Id: <20220713135022.3710682-8-bob.beckett@collabora.com>
Date:   Wed, 13 Jul 2022 14:50:19 +0100
From:   Robert Beckett <bob.beckett@...labora.com>
To:     dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     kernel@...labora.com, Robert Beckett <bob.beckett@...labora.com>,
        Matthew Auld <matthew.auld@...el.com>,
        Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>, linux-kernel@...r.kernel.org
Subject: [PATCH v11 07/10] drm/i915/ttm: add buffer pin on alloc flag

For situations where allocations need to fail on alloc instead of
delayed get_pages, add a new alloc flag to pin the ttm bo.
This makes sure that the resource has been allocated during buffer
creation, allowing it to fail with an error if the placement is
exhausted.
This allows existing fallback options for stolen backend allocation like
create_ring_vma to work as expected.

Signed-off-by: Robert Beckett <bob.beckett@...labora.com>
---
 .../gpu/drm/i915/gem/i915_gem_object_types.h  | 13 ++++++----
 drivers/gpu/drm/i915/gem/i915_gem_ttm.c       | 25 ++++++++++++++++++-
 2 files changed, 32 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
index 14937cf1daaa..283a4b84971a 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
@@ -325,17 +325,20 @@ struct drm_i915_gem_object {
  * dealing with userspace objects the CPU fault handler is free to ignore this.
  */
 #define I915_BO_ALLOC_GPU_ONLY	  BIT(6)
+/* object should be pinned in destination region from allocation */
+#define I915_BO_ALLOC_PINNED	  BIT(7)
 #define I915_BO_ALLOC_FLAGS (I915_BO_ALLOC_CONTIGUOUS | \
 			     I915_BO_ALLOC_VOLATILE | \
 			     I915_BO_ALLOC_CPU_CLEAR | \
 			     I915_BO_ALLOC_USER | \
 			     I915_BO_ALLOC_PM_VOLATILE | \
 			     I915_BO_ALLOC_PM_EARLY | \
-			     I915_BO_ALLOC_GPU_ONLY)
-#define I915_BO_READONLY          BIT(7)
-#define I915_TILING_QUIRK_BIT     8 /* unknown swizzling; do not release! */
-#define I915_BO_PROTECTED         BIT(9)
-#define I915_BO_WAS_BOUND_BIT     10
+			     I915_BO_ALLOC_GPU_ONLY | \
+			     I915_BO_ALLOC_PINNED)
+#define I915_BO_READONLY          BIT(8)
+#define I915_TILING_QUIRK_BIT     9 /* unknown swizzling; do not release! */
+#define I915_BO_PROTECTED         BIT(10)
+#define I915_BO_WAS_BOUND_BIT     11
 	/**
 	 * @mem_flags - Mutable placement-related flags
 	 *
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index b6c3fc25d9d1..d34ebe9fcff8 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -1011,6 +1011,13 @@ static void i915_ttm_delayed_free(struct drm_i915_gem_object *obj)
 {
 	GEM_BUG_ON(!obj->ttm.created);
 
+	/* stolen objects are pinned for lifetime. Unpin before putting */
+	if (obj->flags & I915_BO_ALLOC_PINNED) {
+		ttm_bo_reserve(i915_gem_to_ttm(obj), true, false, NULL);
+		ttm_bo_unpin(i915_gem_to_ttm(obj));
+		ttm_bo_unreserve(i915_gem_to_ttm(obj));
+	}
+
 	ttm_bo_put(i915_gem_to_ttm(obj));
 }
 
@@ -1206,6 +1213,9 @@ int __i915_gem_ttm_object_init(struct intel_memory_region *mem,
 		.no_wait_gpu = false,
 	};
 	enum ttm_bo_type bo_type;
+	struct ttm_place _place;
+	struct ttm_placement _placement;
+	struct ttm_placement *placement;
 	int ret;
 
 	drm_gem_private_object_init(&i915->drm, &obj->base, size);
@@ -1235,6 +1245,17 @@ int __i915_gem_ttm_object_init(struct intel_memory_region *mem,
 	 */
 	i915_gem_object_make_unshrinkable(obj);
 
+	if (obj->flags & I915_BO_ALLOC_PINNED) {
+		i915_ttm_place_from_region(mem, &_place, obj->bo_offset,
+					   obj->base.size, obj->flags);
+		_placement.num_placement = 1;
+		_placement.placement = &_place;
+		_placement.num_busy_placement = 0;
+		_placement.busy_placement = NULL;
+		placement = &_placement;
+	} else {
+		placement = &i915_sys_placement;
+	}
 	/*
 	 * If this function fails, it will call the destructor, but
 	 * our caller still owns the object. So no freeing in the
@@ -1243,7 +1264,7 @@ int __i915_gem_ttm_object_init(struct intel_memory_region *mem,
 	 * until successful initialization.
 	 */
 	ret = ttm_bo_init_reserved(&i915->bdev, i915_gem_to_ttm(obj), bo_type,
-				   &i915_sys_placement, page_size >> PAGE_SHIFT,
+				   placement, page_size >> PAGE_SHIFT,
 				   &ctx, NULL, NULL, i915_ttm_bo_destroy);
 	if (ret)
 		return i915_ttm_err_to_gem(ret);
@@ -1254,6 +1275,8 @@ int __i915_gem_ttm_object_init(struct intel_memory_region *mem,
 	i915_ttm_adjust_domains_after_move(obj);
 	i915_ttm_adjust_gem_after_move(obj);
 	obj->ttm.cache_level_override = false;
+	if (obj->flags & I915_BO_ALLOC_PINNED)
+		ttm_bo_pin(i915_gem_to_ttm(obj));
 	i915_gem_object_unlock(obj);
 
 	return 0;
-- 
2.25.1