diff options
| author | Andi Shyti <andi.shyti@linux.intel.com> | 2024-08-07 13:05:21 +0300 |
|---|---|---|
| committer | Andi Shyti <andi.shyti@linux.intel.com> | 2024-08-21 16:28:33 +0300 |
| commit | 255fc1703e42321b5afdedc8259ad03c7cc533ec (patch) | |
| tree | bb468d4280bad6b1731df269a4b69b9fca20aa1f /drivers/gpu/drm/i915/gem | |
| parent | 609d8b1c422cd8d1f93bf526fb236f2e07687e7c (diff) | |
| download | linux-255fc1703e42321b5afdedc8259ad03c7cc533ec.tar.xz | |
drm/i915/gem: Calculate object page offset for partial memory mapping
To enable partial memory mapping of GPU virtual memory, it's
necessary to introduce an offset to the object's memory
(obj->mm.pages) scatterlist. This adjustment compensates for
instances when userspace mappings do not start from the beginning
of the object.
Based on a patch by Chris Wilson.
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Cc: Chris Wilson <chris.p.wilson@linux.intel.com>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240807100521.478266-3-andi.shyti@linux.intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/gem')
| -rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_mman.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c index 99fde0a05632..21274aa9bddd 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c @@ -252,6 +252,7 @@ static vm_fault_t vm_fault_cpu(struct vm_fault *vmf) struct vm_area_struct *area = vmf->vma; struct i915_mmap_offset *mmo = area->vm_private_data; struct drm_i915_gem_object *obj = mmo->obj; + unsigned long obj_offset; resource_size_t iomap; int err; @@ -273,10 +274,11 @@ static vm_fault_t vm_fault_cpu(struct vm_fault *vmf) iomap -= obj->mm.region->region.start; } + obj_offset = area->vm_pgoff - drm_vma_node_start(&mmo->vma_node); /* PTEs are revoked in obj->ops->put_pages() */ err = remap_io_sg(area, area->vm_start, area->vm_end - area->vm_start, - obj->mm.pages->sgl, iomap); + obj->mm.pages->sgl, obj_offset, iomap); if (area->vm_flags & VM_WRITE) { GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj)); |