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drm: add func to get max iomem address v2

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it will be used to check if the driver needs swiotlb
v2: Don't use inline, instead, move function to drm_memory.c (Michel Daenzer <michel@daenzer.net>)

Signed-off-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Monk Liu <monk.liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180209024410.1469-1-david1.zhou@amd.com
This commit is contained in:
Chunming Zhou 2018-02-09 10:44:08 +08:00 committed by Alex Deucher
parent 65101d8c91
commit 82626363a2
2 changed files with 15 additions and 0 deletions
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13
drivers/gpu/drm/drm_memory.c
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@ -149,3 +149,16 @@ void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
iounmap(map->handle);
}
EXPORT_SYMBOL(drm_legacy_ioremapfree);
u64 drm_get_max_iomem(void)
{
struct resource *tmp;
u64 max_iomem = 0;
for (tmp = iomem_resource.child; tmp; tmp = tmp->sibling) {
max_iomem = max(max_iomem, tmp->end);
}
return max_iomem;
}
EXPORT_SYMBOL(drm_get_max_iomem);

2
include/drm/drm_cache.h
View file

@ -38,6 +38,8 @@
void drm_clflush_pages(struct page *pages[], unsigned long num_pages);
void drm_clflush_sg(struct sg_table *st);
void drm_clflush_virt_range(void *addr, unsigned long length);
u64 drm_get_max_iomem(void);
static inline bool drm_arch_can_wc_memory(void)
{