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drm/amdgpu: require a root bus window above 4GB for BAR resize

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Don't even try to resize the BAR when there is no window above 4GB.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2017-11-15 20:07:38 +01:00 committed by Alex Deucher
parent 35888630cb
commit 31b8adab32
1 changed files with 18 additions and 0 deletions
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18
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@ -764,6 +764,9 @@ int amdgpu_device_resize_fb_bar(struct amdgpu_device *adev)
{
u64 space_needed = roundup_pow_of_two(adev->mc.real_vram_size);
u32 rbar_size = order_base_2(((space_needed >> 20) | 1)) - 1;
struct pci_bus *root;
struct resource *res;
unsigned i;
u16 cmd;
int r;
@ -771,6 +774,21 @@ int amdgpu_device_resize_fb_bar(struct amdgpu_device *adev)
if (amdgpu_sriov_vf(adev))
return 0;
/* Check if the root BUS has 64bit memory resources */
root = adev->pdev->bus;
while (root->parent)
root = root->parent;
pci_bus_for_each_resource(root, res, i) {
if (res && res->flags & IORESOURCE_MEM_64 &&
res->start > 0x100000000ull)
break;
}
/* Trying to resize is pointless without a root hub window above 4GB */
if (!res)
return 0;
/* Disable memory decoding while we change the BAR addresses and size */
pci_read_config_word(adev->pdev, PCI_COMMAND, &cmd);
pci_write_config_word(adev->pdev, PCI_COMMAND,