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Commit e5b606b1 authored by Jordan Crouse's avatar Jordan Crouse
Browse files

msm: kgsl: Allow cache operations for an usermem mapped buffer 



Allow one to perform cache operations on dma-buffers mapped from usermem
addresses.

CRs-Fixed: 699989
Change-Id: Ic0dedbad5152d838079c0f08757904714bfa796d
Signed-off-by: default avatarJordan Crouse <jcrouse@codeaurora.org>
parent 5f953ec6

drivers/gpu/msm/kgsl.c

+23 −0
Original line number Diff line number Diff line
@@ -2708,6 +2708,22 @@ static int match_file(const void *p, struct file *file, unsigned int fd) 
	return (p == file) ? (fd + 1) : 0;

}



static void _setup_cache_mode(struct kgsl_mem_entry *entry,

		struct vm_area_struct *vma)

{

	unsigned int mode;

	pgprot_t pgprot = vma->vm_page_prot;



	if (pgprot == pgprot_noncached(pgprot))

		mode = KGSL_CACHEMODE_UNCACHED;

	else if (pgprot == pgprot_writecombine(pgprot))

		mode = KGSL_CACHEMODE_WRITECOMBINE;

	else

		mode = KGSL_CACHEMODE_WRITEBACK;



	entry->memdesc.flags |= (mode << KGSL_CACHEMODE_SHIFT);

}



static int kgsl_setup_useraddr(struct kgsl_mem_entry *entry,

			      struct kgsl_pagetable *pagetable,

			      void *data,
@@ -2753,6 +2769,13 @@ static int kgsl_setup_useraddr(struct kgsl_mem_entry *entry, 
		int ret = kgsl_setup_dma_buf(entry, pagetable, device, dmabuf);

		if (ret)

			dma_buf_put(dmabuf);

		else {

			/* Match the cache settings of the vma region */

			_setup_cache_mode(entry, vma);

			/* Set the useraddr to the incoming hostptr */

			entry->memdesc.useraddr = param->hostptr;

		}



		return ret;

	}