diff options
| author | Chunming Zhou <david1.zhou@amd.com> | 2018-02-09 10:44:08 +0800 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2018-02-13 11:57:59 -0500 |
| commit | 82626363a217d79128c447ab296777b461e9f050 (patch) | |
| tree | 14ee04c19f1c95ba44bd257d6d44eacc610e0d2a /drivers/gpu/drm/drm_memory.c | |
| parent | drm/vc4: Expose performance counters to userspace (diff) | |
| download | linux-82626363a217d79128c447ab296777b461e9f050.tar.gz linux-82626363a217d79128c447ab296777b461e9f050.zip | |
drm: add func to get max iomem address v2
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
Diffstat (limited to 'drivers/gpu/drm/drm_memory.c')
| -rw-r--r-- | drivers/gpu/drm/drm_memory.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_memory.c b/drivers/gpu/drm/drm_memory.c index fc0ebd273ef8..7ca500b8c399 100644 --- a/drivers/gpu/drm/drm_memory.c +++ b/drivers/gpu/drm/drm_memory.c @@ -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); |