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drm/i915: Add a function to mmap framebuffer obj

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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).
v3: mmap also ttm objects.

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>
Link: https://patchwork.freedesktop.org/patch/msgid/20230404143100.10452-3-nirmoy.das@intel.com
This commit is contained in:
Nirmoy Das 2023-04-04 16:30:58 +02:00
parent ddb78a51fa
commit eaee1c0858
2 changed files with 93 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

137
drivers/gpu/drm/i915/gem/i915_gem_mman.c
View File

@ -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 +1005,91 @@ 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;
/* handle ttm object */
if (obj->ops->mmap_ops) {
/*
* ttm fault handler, ttm_bo_vm_fault_reserved() uses fake offset
* to calculate page offset so set that up.
*/
vma->vm_pgoff += drm_vma_node_start(&obj->base.vma_node);
} else {
/* handle stolen and smem objects */
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(obj);
return i915_gem_object_mmap(obj, mmo, vma);
}
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftests/i915_gem_mman.c"
#endif

2
drivers/gpu/drm/i915/gem/i915_gem_mman.h
View File

@ -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