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* [Intel-gfx] [PATCH v2: 1/3] drm/i915: Add a function to mmap framebuffer obj
@ 2023-03-20 10:09 Nirmoy Das
  2023-03-20 10:09 ` [Intel-gfx] [PATCH 2/3] drm/i915/display: Add helper func to get intel_fbdev from drm_fb_helper Nirmoy Das
                   ` (7 more replies)
  0 siblings, 8 replies; 17+ messages in thread
From: Nirmoy Das @ 2023-03-20 10:09 UTC (permalink / raw)
  To: intel-gfx; +Cc: Jani Nikula, dri-devel, Matthew Auld, Nirmoy Das

Implement i915_gem_fb_mmap() to enable fb_ops.fb_mmap()
callback for i915's framebuffer objects.

v2: add a comment why i915_gem_object_get() needed(Andi).

Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Andi Shyti <andi.shyti@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_mman.c | 127 +++++++++++++++--------
 drivers/gpu/drm/i915/gem/i915_gem_mman.h |   2 +-
 2 files changed, 83 insertions(+), 46 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
index d3c1dee16af2..341e952d3510 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -927,53 +927,15 @@ static struct file *mmap_singleton(struct drm_i915_private *i915)
 	return file;
 }
 
-/*
- * This overcomes the limitation in drm_gem_mmap's assignment of a
- * drm_gem_object as the vma->vm_private_data. Since we need to
- * be able to resolve multiple mmap offsets which could be tied
- * to a single gem object.
- */
-int i915_gem_mmap(struct file *filp, struct vm_area_struct *vma)
+static int
+i915_gem_object_mmap(struct drm_i915_gem_object *obj,
+		     struct i915_mmap_offset *mmo,
+		     struct vm_area_struct *vma)
 {
-	struct drm_vma_offset_node *node;
-	struct drm_file *priv = filp->private_data;
-	struct drm_device *dev = priv->minor->dev;
-	struct drm_i915_gem_object *obj = NULL;
-	struct i915_mmap_offset *mmo = NULL;
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+	struct drm_device *dev = &i915->drm;
 	struct file *anon;
 
-	if (drm_dev_is_unplugged(dev))
-		return -ENODEV;
-
-	rcu_read_lock();
-	drm_vma_offset_lock_lookup(dev->vma_offset_manager);
-	node = drm_vma_offset_exact_lookup_locked(dev->vma_offset_manager,
-						  vma->vm_pgoff,
-						  vma_pages(vma));
-	if (node && drm_vma_node_is_allowed(node, priv)) {
-		/*
-		 * Skip 0-refcnted objects as it is in the process of being
-		 * destroyed and will be invalid when the vma manager lock
-		 * is released.
-		 */
-		if (!node->driver_private) {
-			mmo = container_of(node, struct i915_mmap_offset, vma_node);
-			obj = i915_gem_object_get_rcu(mmo->obj);
-
-			GEM_BUG_ON(obj && obj->ops->mmap_ops);
-		} else {
-			obj = i915_gem_object_get_rcu
-				(container_of(node, struct drm_i915_gem_object,
-					      base.vma_node));
-
-			GEM_BUG_ON(obj && !obj->ops->mmap_ops);
-		}
-	}
-	drm_vma_offset_unlock_lookup(dev->vma_offset_manager);
-	rcu_read_unlock();
-	if (!obj)
-		return node ? -EACCES : -EINVAL;
-
 	if (i915_gem_object_is_readonly(obj)) {
 		if (vma->vm_flags & VM_WRITE) {
 			i915_gem_object_put(obj);
@@ -1005,7 +967,7 @@ int i915_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 	if (obj->ops->mmap_ops) {
 		vma->vm_page_prot = pgprot_decrypted(vm_get_page_prot(vma->vm_flags));
 		vma->vm_ops = obj->ops->mmap_ops;
-		vma->vm_private_data = node->driver_private;
+		vma->vm_private_data = obj->base.vma_node.driver_private;
 		return 0;
 	}
 
@@ -1043,6 +1005,81 @@ int i915_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 	return 0;
 }
 
+/*
+ * This overcomes the limitation in drm_gem_mmap's assignment of a
+ * drm_gem_object as the vma->vm_private_data. Since we need to
+ * be able to resolve multiple mmap offsets which could be tied
+ * to a single gem object.
+ */
+int i915_gem_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	struct drm_vma_offset_node *node;
+	struct drm_file *priv = filp->private_data;
+	struct drm_device *dev = priv->minor->dev;
+	struct drm_i915_gem_object *obj = NULL;
+	struct i915_mmap_offset *mmo = NULL;
+
+	if (drm_dev_is_unplugged(dev))
+		return -ENODEV;
+
+	rcu_read_lock();
+	drm_vma_offset_lock_lookup(dev->vma_offset_manager);
+	node = drm_vma_offset_exact_lookup_locked(dev->vma_offset_manager,
+						  vma->vm_pgoff,
+						  vma_pages(vma));
+	if (node && drm_vma_node_is_allowed(node, priv)) {
+		/*
+		 * Skip 0-refcnted objects as it is in the process of being
+		 * destroyed and will be invalid when the vma manager lock
+		 * is released.
+		 */
+		if (!node->driver_private) {
+			mmo = container_of(node, struct i915_mmap_offset, vma_node);
+			obj = i915_gem_object_get_rcu(mmo->obj);
+
+			GEM_BUG_ON(obj && obj->ops->mmap_ops);
+		} else {
+			obj = i915_gem_object_get_rcu
+				(container_of(node, struct drm_i915_gem_object,
+					      base.vma_node));
+
+			GEM_BUG_ON(obj && !obj->ops->mmap_ops);
+		}
+	}
+	drm_vma_offset_unlock_lookup(dev->vma_offset_manager);
+	rcu_read_unlock();
+	if (!obj)
+		return node ? -EACCES : -EINVAL;
+
+	return i915_gem_object_mmap(obj, mmo, vma);
+}
+
+int i915_gem_fb_mmap(struct drm_i915_gem_object *obj, struct vm_area_struct *vma)
+{
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+	struct drm_device *dev = &i915->drm;
+	struct i915_mmap_offset *mmo = NULL;
+	enum i915_mmap_type mmap_type;
+	struct i915_ggtt *ggtt = to_gt(i915)->ggtt;
+
+	if (drm_dev_is_unplugged(dev))
+		return -ENODEV;
+
+	mmap_type = i915_ggtt_has_aperture(ggtt) ? I915_MMAP_TYPE_GTT : I915_MMAP_TYPE_WC;
+	mmo = mmap_offset_attach(obj, mmap_type, NULL);
+	if (!mmo)
+		return -ENODEV;
+
+	/*
+	 * When we install vm_ops for mmap we are too late for
+	 * the vm_ops->open() which increases the ref_count of
+	 * this obj and then it gets decreased by the vm_ops->close().
+	 * To balance this increase the obj ref_count here.
+	 */
+	obj = i915_gem_object_get(mmo->obj);
+	return i915_gem_object_mmap(obj, mmo, vma);
+}
+
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
 #include "selftests/i915_gem_mman.c"
 #endif
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.h b/drivers/gpu/drm/i915/gem/i915_gem_mman.h
index 1fa91b3033b3..196417fd0f5c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.h
@@ -29,5 +29,5 @@ void i915_gem_object_release_mmap_gtt(struct drm_i915_gem_object *obj);
 
 void i915_gem_object_runtime_pm_release_mmap_offset(struct drm_i915_gem_object *obj);
 void i915_gem_object_release_mmap_offset(struct drm_i915_gem_object *obj);
-
+int i915_gem_fb_mmap(struct drm_i915_gem_object *obj, struct vm_area_struct *vma);
 #endif
-- 
2.39.0


^ permalink raw reply related	[flat|nested] 17+ messages in thread
* [Intel-gfx] [PATCH 1/3] drm/i915: Set I915_BO_ALLOC_USER for framebuffer
@ 2023-03-06 10:28 Nirmoy Das
  2023-03-06 10:28 ` [Intel-gfx] [PATCH RFC 3/3] drm/i915/display: Implement fb_mmap callback function Nirmoy Das
  0 siblings, 1 reply; 17+ messages in thread
From: Nirmoy Das @ 2023-03-06 10:28 UTC (permalink / raw)
  To: intel-gfx; +Cc: dri-devel, Nirmoy Das

Framebuffer is exposed to userspace so set I915_BO_ALLOC_USER
flag for it. This also make sure that ttm allocates offset
for lmem objects.

Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
---
 drivers/gpu/drm/i915/display/intel_dpt.c           | 4 +++-
 drivers/gpu/drm/i915/display/intel_fbdev.c         | 3 ++-
 drivers/gpu/drm/i915/display/intel_plane_initial.c | 3 ++-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dpt.c b/drivers/gpu/drm/i915/display/intel_dpt.c
index ad1a37b515fb..2e6238881860 100644
--- a/drivers/gpu/drm/i915/display/intel_dpt.c
+++ b/drivers/gpu/drm/i915/display/intel_dpt.c
@@ -254,7 +254,9 @@ intel_dpt_create(struct intel_framebuffer *fb)
 
 	size = round_up(size * sizeof(gen8_pte_t), I915_GTT_PAGE_SIZE);
 
-	dpt_obj = i915_gem_object_create_lmem(i915, size, I915_BO_ALLOC_CONTIGUOUS);
+	dpt_obj = i915_gem_object_create_lmem(i915, size,
+					      I915_BO_ALLOC_CONTIGUOUS |
+					      I915_BO_ALLOC_USER);
 	if (IS_ERR(dpt_obj) && i915_ggtt_has_aperture(to_gt(i915)->ggtt))
 		dpt_obj = i915_gem_object_create_stolen(i915, size);
 	if (IS_ERR(dpt_obj) && !HAS_LMEM(i915)) {
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index 3659350061a7..98ae3a3a986a 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -163,7 +163,8 @@ static int intelfb_alloc(struct drm_fb_helper *helper,
 	obj = ERR_PTR(-ENODEV);
 	if (HAS_LMEM(dev_priv)) {
 		obj = i915_gem_object_create_lmem(dev_priv, size,
-						  I915_BO_ALLOC_CONTIGUOUS);
+						  I915_BO_ALLOC_CONTIGUOUS |
+						  I915_BO_ALLOC_USER);
 	} else {
 		/*
 		 * If the FB is too big, just don't use it since fbdev is not very
diff --git a/drivers/gpu/drm/i915/display/intel_plane_initial.c b/drivers/gpu/drm/i915/display/intel_plane_initial.c
index bb6ea7de5c61..4a3680f6a3f5 100644
--- a/drivers/gpu/drm/i915/display/intel_plane_initial.c
+++ b/drivers/gpu/drm/i915/display/intel_plane_initial.c
@@ -110,7 +110,8 @@ initial_plane_vma(struct drm_i915_private *i915,
 	    size * 2 > i915->dsm.usable_size)
 		return NULL;
 
-	obj = i915_gem_object_create_region_at(mem, phys_base, size, 0);
+	obj = i915_gem_object_create_region_at(mem, phys_base, size,
+					       I915_BO_ALLOC_USER);
 	if (IS_ERR(obj))
 		return NULL;
 
-- 
2.39.0


^ permalink raw reply related	[flat|nested] 17+ messages in thread
end of thread, other threads:[~2023-03-23  8:00 UTC | newest]

Thread overview: 17+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-03-20 10:09 [Intel-gfx] [PATCH v2: 1/3] drm/i915: Add a function to mmap framebuffer obj Nirmoy Das
2023-03-20 10:09 ` [Intel-gfx] [PATCH 2/3] drm/i915/display: Add helper func to get intel_fbdev from drm_fb_helper Nirmoy Das
2023-03-20 10:39   ` Jani Nikula
2023-03-20 10:49   ` Andi Shyti
2023-03-20 13:58   ` Andrzej Hajda
2023-03-20 10:09 ` [Intel-gfx] [PATCH RFC 3/3] drm/i915/display: Implement fb_mmap callback function Nirmoy Das
2023-03-20 14:00   ` Andrzej Hajda
2023-03-20 14:02 ` [Intel-gfx] [PATCH v2: 1/3] drm/i915: Add a function to mmap framebuffer obj Andrzej Hajda
2023-03-23  8:00   ` Das, Nirmoy
2023-03-20 19:36 ` [Intel-gfx] ✗ Fi.CI.BUILD: warning for series starting with [v2:,1/3] " Patchwork
2023-03-20 19:36 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: " Patchwork
2023-03-20 19:36 ` [Intel-gfx] ✗ Fi.CI.SPARSE: " Patchwork
2023-03-20 20:01 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2023-03-20 23:38 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork
  -- strict thread matches above, loose matches on Subject: below --
2023-03-06 10:28 [Intel-gfx] [PATCH 1/3] drm/i915: Set I915_BO_ALLOC_USER for framebuffer Nirmoy Das
2023-03-06 10:28 ` [Intel-gfx] [PATCH RFC 3/3] drm/i915/display: Implement fb_mmap callback function Nirmoy Das
2023-03-06 14:32   ` Ville Syrjälä
2023-03-07 14:50     ` Das, Nirmoy

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