drm/nva3/devinit: restrict script access to some PFB regs

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/core/subdev/devinit/nv50.h b/drivers/gpu/drm/nouveau/core/subdev/devinit/nv50.h
index e237910..51d5076 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/subdev/devinit/nv50.h
+++ b/drivers/gpu/drm/nouveau/core/subdev/devinit/nv50.h
@@ -5,6 +5,7 @@
 
 struct nv50_devinit_priv {
        struct nouveau_devinit base;
+       u32 r001540;
 };
 
 int  nv50_devinit_ctor(struct nouveau_object *, struct nouveau_object *,

diff --git a/drivers/gpu/drm/nouveau/core/subdev/devinit/nva3.c b/drivers/gpu/drm/nouveau/core/subdev/devinit/nva3.c
index 6dedf1d..006cf34 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/subdev/devinit/nva3.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/devinit/nva3.c
@@ -81,6 +81,55 @@ nva3_devinit_disable(struct nouveau_devinit *devinit)
        return disable;
 }
 
+static u32
+nva3_devinit_mmio_part[] = {
+       0x100720, 0x1008bc, 4,
+       0x100a20, 0x100adc, 4,
+       0x100d80, 0x100ddc, 4,
+       0x110000, 0x110f9c, 4,
+       0x111000, 0x11103c, 8,
+       0x111080, 0x1110fc, 4,
+       0x111120, 0x1111fc, 4,
+       0x111300, 0x1114bc, 4,
+       0,
+};
+
+static u32
+nva3_devinit_mmio(struct nouveau_devinit *devinit, u32 addr)
+{
+       struct nv50_devinit_priv *priv = (void *)devinit;
+       u32 *mmio = nva3_devinit_mmio_part;
+
+       /* the init tables on some boards have INIT_RAM_RESTRICT_ZM_REG_GROUP
+        * instructions which touch registers that may not even exist on
+        * some configurations (Quadro 400), which causes the register
+        * interface to screw up for some amount of time after attempting to
+        * write to one of these, and results in all sorts of things going
+        * horribly wrong.
+        *
+        * the binary driver avoids touching these registers at all, however,
+        * the video bios doesn't care and does what the scripts say.  it's
+        * presumed that the io-port access to priv registers isn't effected
+        * by the screw-up bug mentioned above.
+        *
+        * really, a new opcode should've been invented to handle these
+        * requirements, but whatever, it's too late for that now.
+        */
+       while (mmio[0]) {
+               if (addr >= mmio[0] && addr <= mmio[1]) {
+                       u32 part = (addr / mmio[2]) & 7;
+                       if (!priv->r001540)
+                               priv->r001540 = nv_rd32(priv, 0x001540);
+                       if (part >= hweight8((priv->r001540 >> 16) & 0xff))
+                               return ~0;
+                       return addr;
+               }
+               mmio += 3;
+       }
+
+       return addr;
+}
+
 struct nouveau_oclass *
 nva3_devinit_oclass = &(struct nouveau_devinit_impl) {
        .base.handle = NV_SUBDEV(DEVINIT, 0xa3),
@@ -92,4 +141,5 @@ nva3_devinit_oclass = &(struct nouveau_devinit_impl) {
        },
        .pll_set = nva3_devinit_pll_set,
        .disable = nva3_devinit_disable,
+       .mmio    = nva3_devinit_mmio,
 }.base;