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Commit c108a412 authored by Tarun Karra's avatar Tarun Karra
Browse files

msm: kgsl: Treat 0x0 as valid GPU pagetable physical address 



Iommu driver could be allocating a valid GPU pagetable at
physical address 0x0, remove assumption from GPU kernel driver
that 0x0 is invalid pagetable address.

Change-Id: I213c0fbc1d90a13bef83c7d7589ad9e5729771fd
Signed-off-by: default avatarTarun Karra <tkarra@codeaurora.org>
parent 773c2fbd

drivers/gpu/msm/kgsl_iommu.c

+8 −6
Original line number Diff line number Diff line
@@ -631,16 +631,18 @@ static int kgsl_iommu_pt_equal(struct kgsl_mmu *mmu, 
				phys_addr_t pt_base)

{

	struct kgsl_iommu_pt *iommu_pt = pt ? pt->priv : NULL;

	phys_addr_t domain_ptbase = iommu_pt ?

				iommu_get_pt_base_addr(iommu_pt->domain) : 0;

	phys_addr_t domain_ptbase;



	/* Only compare the valid address bits of the pt_base */

	domain_ptbase &= KGSL_IOMMU_CTX_TTBR0_ADDR_MASK;

	if (iommu_pt == NULL)

		return 0;



	domain_ptbase = iommu_get_pt_base_addr(iommu_pt->domain)

			& KGSL_IOMMU_CTX_TTBR0_ADDR_MASK;



	pt_base &= KGSL_IOMMU_CTX_TTBR0_ADDR_MASK;



	return domain_ptbase && pt_base &&

		(domain_ptbase == pt_base);

	return (domain_ptbase == pt_base);



}



/*