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drm/nouveau/bios: add more checks to PRAMIN image fetching 

Prevents an attempt to access VRAM on an un-posted board, which, on a
particular system with a GRID K1 installed, causes a MCE and chokes
the entire system.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2014-02-26 10:14:15 +10:00
parent 420b946977
commit 457e77b264
1 changed files with 11 additions and 1 deletions
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12
drivers/gpu/drm/nouveau/core/subdev/bios/base.c
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@ -99,7 +99,17 @@ nouveau_bios_shadow_pramin(struct nouveau_bios *bios)
return;
}
addr = (u64)(nv_rd32(bios, 0x619f04) & 0xffffff00) << 8;
addr = nv_rd32(bios, 0x619f04);
if (!(addr & 0x00000008)) {
nv_debug(bios, "... not enabled\n");
return;
}
if ( (addr & 0x00000003) != 1) {
nv_debug(bios, "... not in vram\n");
return;
}
addr = (u64)(addr >> 8) << 8;
if (!addr) {
addr = (u64)nv_rd32(bios, 0x001700) << 16;
addr += 0xf0000;