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drm/nouveau/bar/nv50: ensure BAR is mapped

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[ Upstream commit f10b83de1f ]

If the BAR is zero size, it indicates it was never successfully mapped.
Ensure that the BAR is valid during initialization before attempting to
use it.

Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jon Derrick 2019-03-15 18:05:16 -06:00 committed by Greg Kroah-Hartman
parent 07bb9a71ee
commit 5744fd7fa1
1 changed files with 9 additions and 3 deletions
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12
drivers/gpu/drm/nouveau/nvkm/subdev/bar/nv50.c
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@ -109,7 +109,7 @@ nv50_bar_oneinit(struct nvkm_bar *base)
struct nvkm_device *device = bar->base.subdev.device;
static struct lock_class_key bar1_lock;
static struct lock_class_key bar2_lock;
u64 start, limit;
u64 start, limit, size;
int ret;
ret = nvkm_gpuobj_new(device, 0x20000, 0, false, NULL, &bar->mem);
@ -127,7 +127,10 @@ nv50_bar_oneinit(struct nvkm_bar *base)
/* BAR2 */
start = 0x0100000000ULL;
limit = start + device->func->resource_size(device, 3);
size = device->func->resource_size(device, 3);
if (!size)
return -ENOMEM;
limit = start + size;
ret = nvkm_vmm_new(device, start, limit-- - start, NULL, 0,
&bar2_lock, "bar2", &bar->bar2_vmm);
@ -164,7 +167,10 @@ nv50_bar_oneinit(struct nvkm_bar *base)
/* BAR1 */
start = 0x0000000000ULL;
limit = start + device->func->resource_size(device, 1);
size = device->func->resource_size(device, 1);
if (!size)
return -ENOMEM;
limit = start + size;
ret = nvkm_vmm_new(device, start, limit-- - start, NULL, 0,
&bar1_lock, "bar1", &bar->bar1_vmm);