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nvmap: Fix coherency issues while creating subhandle

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Make sure that all handles, from which sub-buffer handle needs to be
created, have same cache coherency, are of type RW, not created from VA.
Set the cache coherency of the sub-buffer handle same as the cache
coherency of the main handles, so that explicit cache flush is not
needed during vma fault.

Bug 3494980

Change-Id: I878568e4cdc4529fb3d1a6682e38798769dad9c0
Signed-off-by: Ketan Patil <ketanp@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2819129
Reviewed-by: Puneet Saxena <puneets@nvidia.com>
Reviewed-by: Krishna Reddy <vdumpa@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com>
Reviewed-by: svc_kernel_abi <svc_kernel_abi@nvidia.com>
Reviewed-by: Sachin Nikam <snikam@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Ketan Patil
2022-11-30 09:58:04 +00:00
committed by Laxman Dewangan
parent ec9ee786c4
commit abb244025f
3 changed files with 11 additions and 16 deletions
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7
drivers/video/tegra/nvmap/nvmap_fault.c
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@@ -229,13 +229,6 @@ static int nvmap_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
if (PageAnon(page) && (vma->vm_flags & VM_SHARED))
return VM_FAULT_SIGSEGV;
if (priv->handle->is_subhandle) {
pr_err("sub_handle page:%p\n", page);
kaddr = kmap(page);
BUG_ON(!kaddr);
inner_cache_maint(NVMAP_CACHE_OP_WB_INV, kaddr, PAGE_SIZE);
kunmap(page);
}
if (!nvmap_handle_track_dirty(priv->handle))
goto finish;
mutex_lock(&priv->handle->lock);