The current implementation of i915 prime mmap only worked when initializing
drm_i915_gem_object with shmem_region.
When using LMEM, drm_i915_gem_object is initialized with ttm_system_region.
In order to make prime mmap work even this case, when using LMEM
(when using ttm in i915), dma_buf_ops.mmap callback calls drm_gem_prime_mmap().
drm_gem_prime_mmap() of drm core calls internally i915_gem_mmap() so that
prime mmap can perform normally.
The fake offset is processed inside drm_gem_prime_mmap().
Testcase: igt/prime_mmap
This patch makes all of igt/prime_mmap tests success on gpus which use LMEM.
And these series remove defining and using a duplicate function: i915_gem_unmap_dma_buf()
After landing this patch. I'm going to send refactoring rfc patches that
handles the drm_driver.gem_prime_mmap callback, drm_gem_object_funcs.mmap
callback and drm_gem_object_funcs.vm_ops calllback.
ref: https://01.org/linuxgraphics/gfx-docs/drm/gpu/todo.html?#clean-up-mmap-forwarding
https://www.kernel.org/doc/html/latest/gpu/todo.html#struct-drm-gem-object-funcs
Gwan-gyeong Mun (2):
drm/i915/dmabuf: Update dma_buf_ops.unmap_dma_buf callback to use
drm_gem_unmap_dma_buf()
drm/i915/dmabuf: Fix prime_mmap to work when using LMEM
drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 15 +++++----------
1 file changed, 5 insertions(+), 10 deletions(-)
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2.34.1
