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drm/radeon: adjust default radeon_vm_block_size v2

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v2: rebase on vm_size scale change. Adjust vm_size default to 8,
    Better handle the default and smaller values.

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König
2014-07-19 13:55:58 +02:00
committed by Alex Deucher
parent f77c4f0223
commit dfc230f9af
2 changed files with 16 additions and 4 deletions
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14
drivers/gpu/drm/radeon/radeon_device.c
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@@ -1123,7 +1123,19 @@ static void radeon_check_arguments(struct radeon_device *rdev)
/* defines number of bits in page table versus page directory,
* a page is 4KB so we have 12 bits offset, minimum 9 bits in the
* page table and the remaining bits are in the page directory */
if (radeon_vm_block_size < 9) {
if (radeon_vm_block_size == -1) {
/* Total bits covered by PD + PTs */
unsigned bits = ilog2(radeon_vm_size) + 17;
/* Make sure the PD is 4K in size up to 8GB address space.
Above that split equal between PD and PTs */
if (radeon_vm_size <= 8)
radeon_vm_block_size = bits - 9;
else
radeon_vm_block_size = (bits + 3) / 2;
} else if (radeon_vm_block_size < 9) {
dev_warn(rdev->dev, "VM page table size (%d) too small\n",
radeon_vm_block_size);
radeon_vm_block_size = 9;