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drm/nouveau/ltc/gm200: limit NV_MMU_PTE_COMPTAGLINE bits to 16 where required

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If NV_PFB_MMU_CTRL_USE_FULL_COMP_TAG_LINE is TRUE, then the last bit of
NV_MMU_PTE_COMPTAGLINE is re-purposed to select the upper/lower half of
a compression tag when using 64KiB big pages.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs
2017-11-01 03:56:19 +10:00
parent ac47c15b76
commit f8a1203920
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/nouveau/nvkm/subdev/ltc/gf100.c
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@@ -156,6 +156,7 @@ gf100_ltc_oneinit_tag_ram(struct nvkm_ltc *ltc)
struct nvkm_device *device = ltc->subdev.device;
struct nvkm_fb *fb = device->fb;
struct nvkm_ram *ram = fb->ram;
u32 bits = (nvkm_rd32(device, 0x100c80) & 0x00001000) ? 16 : 17;
u32 tag_size, tag_margin, tag_align;
int ret;
@@ -167,8 +168,8 @@ gf100_ltc_oneinit_tag_ram(struct nvkm_ltc *ltc)
/* tags for 1/4 of VRAM should be enough (8192/4 per GiB of VRAM) */
ltc->num_tags = (ram->size >> 17) / 4;
if (ltc->num_tags > (1 << 17))
ltc->num_tags = 1 << 17; /* we have 17 bits in PTE */
if (ltc->num_tags > (1 << bits))
ltc->num_tags = 1 << bits; /* we have 16/17 bits in PTE */
ltc->num_tags = (ltc->num_tags + 63) & ~63; /* round up to 64 */
tag_align = ltc->ltc_nr * 0x800;