[PATCH 7/9] drm/amdgpu: add smu_memory_pool_size module parameter

[Alex Deucher]

On Mon, Oct 9, 2017 at 12:42 AM, Rex Zhu <Rex.Zhu at amd.com> wrote:
> this allow allocate system memmoy for smu
> debug usage.
>
> Change-Id: Iac0489e528395448abeaf23a22cd6a1031a5b55b
> Signed-off-by: Rex Zhu <Rex.Zhu at amd.com>

I'd prefer to expose this via debugfs so we can enable/disable it on
the fly.  We can clamp the size based on the gart size and if we want
a larger buffer, just tell the user to change amdgpu.gart_size

Alex

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu.h     | 1 +
>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 5 +++++
>  2 files changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index 07a699d..3a79d41 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -132,6 +132,7 @@
>  #ifdef CONFIG_DRM_AMDGPU_CIK
>  extern int amdgpu_cik_support;
>  #endif
> +extern uint amdgpu_smu_memory_pool_size;
>
>  #define AMDGPU_DEFAULT_GTT_SIZE_MB             3072ULL /* 3GB by default */
>  #define AMDGPU_WAIT_IDLE_TIMEOUT_IN_MS         3000
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index 374a7a1..a7b6732 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -125,6 +125,7 @@
>  int amdgpu_job_hang_limit = 0;
>  int amdgpu_lbpw = -1;
>  int amdgpu_compute_multipipe = -1;
> +uint amdgpu_smu_memory_pool_size = 0;
>
>  MODULE_PARM_DESC(vramlimit, "Restrict VRAM for testing, in megabytes");
>  module_param_named(vramlimit, amdgpu_vram_limit, int, 0600);
> @@ -300,6 +301,10 @@
>  module_param_named(cik_support, amdgpu_cik_support, int, 0444);
>  #endif
>
> +MODULE_PARM_DESC(smu_memory_pool_size,
> +       "Allocate system memory for smu debug usage, 0 = disable,"
> +               "0x1 = 256Mbyte, 0x2 = 512Mbyte, 0x4 = 1 Gbyte, 0x8 = 2GByte");
> +module_param_named(smu_memory_pool_size, amdgpu_smu_memory_pool_size, uint, 0444);
>
>  static const struct pci_device_id pciidlist[] = {
>  #ifdef  CONFIG_DRM_AMDGPU_SI
> --
> 1.9.1
>
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