From: =?UTF-8?q?Christian=20K=C3=B6nig?= <ckoenig.leichtzumerken@gmail.com>
Date: Tue, 27 Feb 2018 12:49:57 +0100
Subject: drm/prime: make the pages array optional for
drm_prime_sg_to_page_addr_arrays
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Git-commit: 186ca446aea19e49d2e1433dd170c6e1c211a52a
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
Most of the time we only need the dma addresses.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Roger He <Hongbo.He@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180227115000.4105-2-christian.koenig@amd.com
Link: https://patchwork.freedesktop.org/patch/msgid/20180227115000.4105-3-christian.koenig@amd.com
Link: https://patchwork.freedesktop.org/patch/msgid/20180227115000.4105-4-christian.koenig@amd.com
Link: https://patchwork.freedesktop.org/patch/msgid/20180227115000.4105-5-christian.koenig@amd.com
Link: https://patchwork.freedesktop.org/patch/msgid/BN6PR12MB18262C0DE9B5F07B9A42EAE7F2C60@BN6PR12MB1826.namprd12.prod.outlook.com
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/drm_prime.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -922,40 +922,40 @@ EXPORT_SYMBOL(drm_prime_pages_to_sg);
/**
* drm_prime_sg_to_page_addr_arrays - convert an sg table into a page array
* @sgt: scatter-gather table to convert
- * @pages: array of page pointers to store the page array in
+ * @pages: optional array of page pointers to store the page array in
* @addrs: optional array to store the dma bus address of each page
- * @max_pages: size of both the passed-in arrays
+ * @max_entries: size of both the passed-in arrays
*
* Exports an sg table into an array of pages and addresses. This is currently
* required by the TTM driver in order to do correct fault handling.
*/
int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,
- dma_addr_t *addrs, int max_pages)
+ dma_addr_t *addrs, int max_entries)
{
unsigned count;
struct scatterlist *sg;
struct page *page;
- u32 len;
- int pg_index;
+ u32 len, index;
dma_addr_t addr;
- pg_index = 0;
+ index = 0;
for_each_sg(sgt->sgl, sg, sgt->nents, count) {
len = sg->length;
page = sg_page(sg);
addr = sg_dma_address(sg);
while (len > 0) {
- if (WARN_ON(pg_index >= max_pages))
+ if (WARN_ON(index >= max_entries))
return -1;
- pages[pg_index] = page;
+ if (pages)
+ pages[index] = page;
if (addrs)
- addrs[pg_index] = addr;
+ addrs[index] = addr;
page++;
addr += PAGE_SIZE;
len -= PAGE_SIZE;
- pg_index++;
+ index++;
}
}
return 0;