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msm: kgsl: Perform cache flush on the pages obtained using get_user_pages()

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Consider a scenario where user allocates anonymous memory but does not
write to it. Here the physical pages are not yet allocated. Now when this
memory is requested to be imported, a list of newly allocated zero pages
is obtained using get_user_pages(). Currently cache flush is not done for
these pages and hence GPU sees stale data. Fix this by performing cache
flush on these pages.

Change-Id: Id1e8aa20e8a9de112761732ed92f30c01088840b
Signed-off-by: Puranam V G Tejaswi <quic_pvgtejas@quicinc.com>
Signed-off-by: Sebanti Das <quic_sebadas@quicinc.com>
Signed-off-by: Kamal Agrawal <quic_kamaagra@quicinc.com>
This commit is contained in:
Puranam V G Tejaswi 2022-01-07 02:20:41 +05:30 • committed by Kamal Agrawal
commit 63b454fefb
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/msm/kgsl.c
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@ -1,4 +1,5 @@
/* Copyright (c) 2008-2021, The Linux Foundation. All rights reserved.
* Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@ -2179,6 +2180,15 @@ static int memdesc_sg_virt(struct kgsl_memdesc *memdesc, unsigned long useraddr)
ret = sg_alloc_table_from_pages(memdesc->sgt, pages, npages,
0, memdesc->size, GFP_KERNEL);
if (ret)
goto out;
ret = kgsl_cache_range_op(memdesc, 0, memdesc->size,
KGSL_CACHE_OP_FLUSH);
if (ret)
sg_free_table(memdesc->sgt);
out:
if (ret) {
for (i = 0; i < npages; i++)