On Wed, Oct 02, 2019 at 04:37:41PM -0400, John David Anglin wrote:
> On 2019-10-02 10:19 a.m., Thomas Bogendoerfer wrote:
> > + pa = addr & IOVP_MASK;
> > + mtsp(0,1);
> > + asm("lci 0(%%sr1, %1), %0" : "=r" (ci) : "r" (__va(pa)));
> I believe you can remove the mtsp and just use "lci 0(%1), %0" to load the coherence index. The space
> registers sr4 to sr7 are always 0 in kernel.
ok, good to know.
while reading this I realized what the other hacks were for, which I didn't
include in my first mail.
diff --git a/drivers/gpu/drm/ttm/ttm_agp_backend.c b/drivers/gpu/drm/ttm/ttm_agp_backend.c
index 028ab6007873..e84c7652eb1b 100644
--- a/drivers/gpu/drm/ttm/ttm_agp_backend.c
+++ b/drivers/gpu/drm/ttm/ttm_agp_backend.c
@@ -66,7 +67,8 @@ static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
if (!page)
page = ttm->dummy_read_page;
- mem->pages[mem->page_count++] = page;
+ mem->pages[(ttm->num_pages - 1) - mem->page_count] = page;
+ mem->page_count++;
}
agp_be->mem = mem;
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index d0459b392e5e..4bb301cab128 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -571,8 +571,14 @@ static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
*/
prot = ttm_io_prot(mem->placement, PAGE_KERNEL);
map->bo_kmap_type = ttm_bo_map_vmap;
+ printk("vmap %p\n", ttm->pages[start_page]);
+#if 0
map->virtual = vmap(ttm->pages + start_page, num_pages,
0, prot);
+#else
+ map->virtual = kmap(ttm->pages[start_page]);
+#endif
+
}
return (!map->virtual) ? -ENOMEM : 0;
}
This is needed to be able to get the virtual address with __va(pa).
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
