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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
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/video/tegra/nvmap/nvmap_alloc.c
View File

@@ -1176,16 +1176,12 @@ static int nvmap_assign_pages_per_handle(struct nvmap_handle *src_h,
while (src_h_start < src_h_end) {
unsigned long next;
struct page *src_page;
struct page *dest_page;
dest_h->pgalloc.pages[*pg_cnt] =
src_h->pgalloc.pages[src_h_start >> PAGE_SHIFT];
src_page = nvmap_to_page(src_h->pgalloc.pages
[src_h_start >> PAGE_SHIFT]);
dest_page = nvmap_to_page(dest_h->pgalloc.pages[*pg_cnt]);
get_page(dest_page);
nvmap_clean_cache_page(src_page);
next = min(((src_h_start + PAGE_SIZE) & PAGE_MASK),
src_h_end);
@@ -1243,11 +1239,11 @@ int nvmap_assign_pages_to_handle(struct nvmap_client *client,
start = 0;
}
h->flags = hs[0]->flags;
h->heap_type = NVMAP_HEAP_IOVMM;
h->heap_pgalloc = true;
h->alloc = true;
h->is_subhandle = true;
atomic_set(&h->pgalloc.ndirty, 0);
mb();
return err;
err_h:

7
drivers/video/tegra/nvmap/nvmap_fault.c
View File

@@ -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);

14
drivers/video/tegra/nvmap/nvmap_ioctl.c
View File

@@ -1487,7 +1487,7 @@ int nvmap_ioctl_get_fd_from_list(struct file *filp, void __user *arg)
struct nvmap_handle *h = NULL;
struct handles_range hrange = {0};
size_t tot_hs_size = 0;
u32 i, count = 0;
u32 i, count = 0, flags = 0;
size_t bytes;
int err = 0;
int fd = -1;
@@ -1552,12 +1552,18 @@ int nvmap_ioctl_get_fd_from_list(struct file *filp, void __user *arg)
goto free_hs;
}
/* Check all of the handles from system heap */
flags = hs[0]->flags;
/*
* Check all of the handles from system heap, are RW, not from VA
* and having same cache coherency
*/
for (i = 0; i < op.num_handles; i++)
if (hs[i]->heap_pgalloc)
if (hs[i]->heap_pgalloc && !hs[i]->from_va &&
!hs[i]->is_ro && hs[i]->flags == flags)
count++;
if (!count || (op.num_handles && count % op.num_handles)) {
pr_err("all or none of the handles should be from heap\n");
pr_err("all of the handles should be from system heap, of type RW,"
" not from VA and having same cache coherency\n");
err = -EINVAL;
goto free_hs;
}