[PATCH] drm/nouveau: fix ltcg memory corruptions

[Ben Skeggs]

On Thu, Aug 8, 2013 at 1:16 AM, Maarten Lankhorst
<maarten.lankhorst at canonical.com> wrote:
> Allocating type=0 marks the memory as free. This allows the ltcg memory to be
> allocated twice. Add a BUG_ON in core/mm.c to prevent this ever happening again.
> Additionally some registers were not initialized in init, this causes them to be
> uninitialized after suspend.
Ack in general.  A couple of things though:

1. Split the two changes into two patches
2. drm/nvc0-/ltcg, and not drm/nouveau - this is the format we
generally use for specific fixes

Thanks,
Ben.

>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at canonical.com>
> ---
> diff --git a/drivers/gpu/drm/nouveau/core/core/mm.c b/drivers/gpu/drm/nouveau/core/core/mm.c
> index d829172..7a4e089 100644
> --- a/drivers/gpu/drm/nouveau/core/core/mm.c
> +++ b/drivers/gpu/drm/nouveau/core/core/mm.c
> @@ -98,6 +98,8 @@ nouveau_mm_head(struct nouveau_mm *mm, u8 type, u32 size_max, u32 size_min,
>         u32 splitoff;
>         u32 s, e;
>
> +       BUG_ON(!type);
> +
>         list_for_each_entry(this, &mm->free, fl_entry) {
>                 e = this->offset + this->length;
>                 s = this->offset;
> @@ -162,6 +164,8 @@ nouveau_mm_tail(struct nouveau_mm *mm, u8 type, u32 size_max, u32 size_min,
>         struct nouveau_mm_node *prev, *this, *next;
>         u32 mask = align - 1;
>
> +       BUG_ON(!type);
> +
>         list_for_each_entry_reverse(this, &mm->free, fl_entry) {
>                 u32 e = this->offset + this->length;
>                 u32 s = this->offset;
> diff --git a/drivers/gpu/drm/nouveau/core/subdev/ltcg/nvc0.c b/drivers/gpu/drm/nouveau/core/subdev/ltcg/nvc0.c
> index bcca883..7288940 100644
> --- a/drivers/gpu/drm/nouveau/core/subdev/ltcg/nvc0.c
> +++ b/drivers/gpu/drm/nouveau/core/subdev/ltcg/nvc0.c
> @@ -30,8 +30,9 @@ struct nvc0_ltcg_priv {
>         struct nouveau_ltcg base;
>         u32 part_nr;
>         u32 subp_nr;
> -       struct nouveau_mm tags;
>         u32 num_tags;
> +       u32 tag_base;
> +       struct nouveau_mm tags;
>         struct nouveau_mm_node *tag_ram;
>  };
>
> @@ -117,10 +118,6 @@ nvc0_ltcg_init_tag_ram(struct nouveau_fb *pfb, struct nvc0_ltcg_priv *priv)
>         u32 tag_size, tag_margin, tag_align;
>         int ret;
>
> -       nv_wr32(priv, 0x17e8d8, priv->part_nr);
> -       if (nv_device(pfb)->card_type >= NV_E0)
> -               nv_wr32(priv, 0x17e000, priv->part_nr);
> -
>         /* tags for 1/4 of VRAM should be enough (8192/4 per GiB of VRAM) */
>         priv->num_tags = (pfb->ram->size >> 17) / 4;
>         if (priv->num_tags > (1 << 17))
> @@ -142,7 +139,7 @@ nvc0_ltcg_init_tag_ram(struct nouveau_fb *pfb, struct nvc0_ltcg_priv *priv)
>         tag_size += tag_align;
>         tag_size  = (tag_size + 0xfff) >> 12; /* round up */
>
> -       ret = nouveau_mm_tail(&pfb->vram, 0, tag_size, tag_size, 1,
> +       ret = nouveau_mm_tail(&pfb->vram, 1, tag_size, tag_size, 1,
>                               &priv->tag_ram);
>         if (ret) {
>                 priv->num_tags = 0;
> @@ -152,7 +149,7 @@ nvc0_ltcg_init_tag_ram(struct nouveau_fb *pfb, struct nvc0_ltcg_priv *priv)
>                 tag_base += tag_align - 1;
>                 ret = do_div(tag_base, tag_align);
>
> -               nv_wr32(priv, 0x17e8d4, tag_base);
> +               priv->tag_base = tag_base;
>         }
>         ret = nouveau_mm_init(&priv->tags, 0, priv->num_tags, 1);
>
> @@ -182,8 +179,6 @@ nvc0_ltcg_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
>         }
>         priv->subp_nr = nv_rd32(priv, 0x17e8dc) >> 28;
>
> -       nv_mask(priv, 0x17e820, 0x00100000, 0x00000000); /* INTR_EN &= ~0x10 */
> -
>         ret = nvc0_ltcg_init_tag_ram(pfb, priv);
>         if (ret)
>                 return ret;
> @@ -209,13 +204,36 @@ nvc0_ltcg_dtor(struct nouveau_object *object)
>         nouveau_ltcg_destroy(ltcg);
>  }
>
> +int
> +nvc0_ltcg_init(struct nouveau_object *object)
> +{
> +       struct nouveau_ltcg *ltcg = (struct nouveau_ltcg *)object;
> +       struct nvc0_ltcg_priv *priv = (struct nvc0_ltcg_priv *)ltcg;
> +       struct nouveau_fb *pfb = nouveau_fb(ltcg->base.base.parent);
> +       int ret;
> +
> +       ret = nouveau_subdev_init(&pfb->base);
> +       if (ret)
> +               return ret;
> +
> +       nv_mask(priv, 0x17e820, 0x00100000, 0x00000000); /* INTR_EN &= ~0x10 */
> +
> +       nv_wr32(priv, 0x17e8d8, priv->part_nr);
> +       if (nv_device(pfb)->card_type >= NV_E0)
> +               nv_wr32(priv, 0x17e000, priv->part_nr);
> +
> +       nv_wr32(priv, 0x17e8d4, priv->tag_base);
> +
> +       return 0;
> +}
> +
>  struct nouveau_oclass
>  nvc0_ltcg_oclass = {
>         .handle = NV_SUBDEV(LTCG, 0xc0),
>         .ofuncs = &(struct nouveau_ofuncs) {
>                 .ctor = nvc0_ltcg_ctor,
>                 .dtor = nvc0_ltcg_dtor,
> -               .init = _nouveau_ltcg_init,
> +               .init = nvc0_ltcg_init,
>                 .fini = _nouveau_ltcg_fini,
>         },
>  };
>
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