On 04.10.19 14:06, Thomas Bogendoerfer wrote:
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).
Can you make a documented patch out of all that?
I'd like to include it at least into a test/hack branch, e.g.
https://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git/commit/?h=radeon-test&id=0ef942c21d37078ae6406b3e7075f3dbe6417a04
Helge
