[PATCH 11/11] drm/amdgpu: add sysvm_size

[Alex Deucher]

On Mon, Jul 3, 2017 at 5:44 AM, Christian König <deathsimple at vodafone.de> wrote:
> From: Christian König <christian.koenig at amd.com>
>
> Limit the size of the SYSVM. This saves us a bunch of visible VRAM,
> but also limitates the maximum BO size we can swap out.

Update the description.  The limitation is removed now.

>
> v2: rebased and cleaned up after GART to SYSVM rename.
>
> Signed-off-by: Christian König <christian.koenig at amd.com>

Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu.h         | 1 +
>  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c  | 6 ++++++
>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c     | 4 ++++
>  drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c | 6 ++++--
>  drivers/gpu/drm/amd/amdgpu/amdgpu_sysvm.c   | 9 +--------
>  5 files changed, 16 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index 1ed6b7a..81de31a 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -77,6 +77,7 @@
>  extern int amdgpu_modeset;
>  extern int amdgpu_vram_limit;
>  extern int amdgpu_gart_size;
> +extern unsigned amdgpu_sysvm_size;
>  extern int amdgpu_moverate;
>  extern int amdgpu_benchmarking;
>  extern int amdgpu_testing;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 228b262..daded9c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -1086,6 +1086,12 @@ static void amdgpu_check_arguments(struct amdgpu_device *adev)
>                 }
>         }
>
> +       if (amdgpu_sysvm_size < 32) {
> +               dev_warn(adev->dev, "sysvm size (%d) too small\n",
> +                                amdgpu_sysvm_size);
> +               amdgpu_sysvm_size = 32;
> +       }
> +
>         amdgpu_check_vm_size(adev);
>
>         amdgpu_check_block_size(adev);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index 4bf4a80..56f9867 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -75,6 +75,7 @@
>
>  int amdgpu_vram_limit = 0;
>  int amdgpu_gart_size = -1; /* auto */
> +unsigned amdgpu_sysvm_size = 256;
>  int amdgpu_moverate = -1; /* auto */
>  int amdgpu_benchmarking = 0;
>  int amdgpu_testing = 0;
> @@ -124,6 +125,9 @@ module_param_named(vramlimit, amdgpu_vram_limit, int, 0600);
>  MODULE_PARM_DESC(gartsize, "Size of PCIE/IGP gart to setup in megabytes (32, 64, etc., -1 = auto)");
>  module_param_named(gartsize, amdgpu_gart_size, int, 0600);
>
> +MODULE_PARM_DESC(sysvmsize, "Size of the system VM in megabytes (default 256)");
> +module_param_named(sysvmsize, amdgpu_sysvm_size, int, 0600);
> +
>  MODULE_PARM_DESC(moverate, "Maximum buffer migration rate in MB/s. (32, 64, etc., -1=auto, 0=1=disabled)");
>  module_param_named(moverate, amdgpu_moverate, int, 0600);
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> index f46a97d..bbf6bd0 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> @@ -42,6 +42,7 @@ struct amdgpu_gtt_mgr {
>  static int amdgpu_gtt_mgr_init(struct ttm_mem_type_manager *man,
>                                unsigned long p_size)
>  {
> +       struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
>         struct amdgpu_gtt_mgr *mgr;
>         uint64_t start, size;
>
> @@ -50,7 +51,7 @@ static int amdgpu_gtt_mgr_init(struct ttm_mem_type_manager *man,
>                 return -ENOMEM;
>
>         start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
> -       size = p_size - start;
> +       size = (adev->mc.sysvm_size >> PAGE_SHIFT) - start;
>         drm_mm_init(&mgr->mm, start, size);
>         spin_lock_init(&mgr->lock);
>         mgr->available = p_size;
> @@ -112,6 +113,7 @@ int amdgpu_gtt_mgr_alloc(struct ttm_mem_type_manager *man,
>                          const struct ttm_place *place,
>                          struct ttm_mem_reg *mem)
>  {
> +       struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
>         struct amdgpu_gtt_mgr *mgr = man->priv;
>         struct drm_mm_node *node = mem->mm_node;
>         enum drm_mm_insert_mode mode;
> @@ -129,7 +131,7 @@ int amdgpu_gtt_mgr_alloc(struct ttm_mem_type_manager *man,
>         if (place && place->lpfn)
>                 lpfn = place->lpfn;
>         else
> -               lpfn = man->size;
> +               lpfn = adev->sysvm.num_cpu_pages;
>
>         mode = DRM_MM_INSERT_BEST;
>         if (place && place->flags & TTM_PL_FLAG_TOPDOWN)
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sysvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sysvm.c
> index ff436ad..711e4b6 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sysvm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sysvm.c
> @@ -62,14 +62,7 @@
>   */
>  void amdgpu_sysvm_set_defaults(struct amdgpu_device *adev)
>  {
> -       /* unless the user had overridden it, set the gart
> -        * size equal to the 1024 or vram, whichever is larger.
> -        */
> -       if (amdgpu_gart_size == -1)
> -               adev->mc.sysvm_size = max((AMDGPU_DEFAULT_GTT_SIZE_MB << 20),
> -                                       adev->mc.mc_vram_size);
> -       else
> -               adev->mc.sysvm_size = (uint64_t)amdgpu_gart_size << 20;
> +       adev->mc.sysvm_size = (uint64_t)amdgpu_sysvm_size << 20;
>  }
>
>  /**
> --
> 2.7.4
>
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