On 18.07.2014 11:38, Christian K?nig wrote:
> From: Christian K?nig <christian.koenig at amd.com>
>
> Signed-off-by: Christian K?nig <christian.koenig at amd.com>
> ---
> drivers/gpu/drm/radeon/radeon_device.c | 6 +++++-
> drivers/gpu/drm/radeon/radeon_drv.c | 4 ++--
> 2 files changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_device.c
> b/drivers/gpu/drm/radeon/radeon_device.c
> index 03686fa..a2960db 100644
> --- a/drivers/gpu/drm/radeon/radeon_device.c
> +++ b/drivers/gpu/drm/radeon/radeon_device.c
> @@ -1077,7 +1077,11 @@ 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) {
> + radeon_vm_block_size = (ilog2(radeon_vm_size) + 10) / 2;
> + radeon_vm_block_size = max(radeon_vm_block_size, 9);
> +
> + } else if (radeon_vm_block_size < 9) {
Hm, that automatic calculation seems strange. Is there any particular
reason why you haven chosen this? This will use vm_block_size=11 for
4096 MB VM space. I have used vm_block_size=12 with good results. This
manages 16 MB of VM space per page table, which seems reasonable. I also
see a noticeable CPU overhead reduction between 11 and 12.
Grigori
> dev_warn(rdev->dev, "VM page table size (%d) to small\n",
> radeon_vm_block_size);
> radeon_vm_block_size = 9;
> diff --git a/drivers/gpu/drm/radeon/radeon_drv.c
> b/drivers/gpu/drm/radeon/radeon_drv.c
> index cb14213..fef5320 100644
> --- a/drivers/gpu/drm/radeon/radeon_drv.c
> +++ b/drivers/gpu/drm/radeon/radeon_drv.c
> @@ -174,7 +174,7 @@ int radeon_aspm = -1;
> int radeon_runtime_pm = -1;
> int radeon_hard_reset = 0;
> int radeon_vm_size = 4096;
> -int radeon_vm_block_size = 9;
> +int radeon_vm_block_size = -1;
> int radeon_deep_color = 0;
>
> MODULE_PARM_DESC(no_wb, "Disable AGP writeback for scratch registers");
> @@ -246,7 +246,7 @@ module_param_named(hard_reset, radeon_hard_reset, int,
> 0444);
> MODULE_PARM_DESC(vm_size, "VM address space size in megabytes (default
> 4GB)");
> module_param_named(vm_size, radeon_vm_size, int, 0444);
>
> -MODULE_PARM_DESC(vm_block_size, "VM page table size in bits (default 9)");
> +MODULE_PARM_DESC(vm_block_size, "VM page table size in bits (default
> depending on vm_size)");
> module_param_named(vm_block_size, radeon_vm_block_size, int, 0444);
>
> MODULE_PARM_DESC(deep_color, "Deep Color support (1 = enable, 0 = disable
> (default))");
>
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