Re: [PATCH v10 03/11] drm/ttm: Add a generic TTM memcpy move for page-based iomem

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Hi!

On 8/30/21 8:16 AM, Christian König wrote:
Am 30.08.21 um 03:54 schrieb Dave Airlie:
I've just been talking with Ben about nouveau having some issues since
this path,

ttm_resource can be subclassed by drivers, and the code below that
copies ttm_resources around pretty much seems to destroy that.


+       struct ttm_resource *src_mem = &bo->mem;
+       struct ttm_resource_manager *src_man =
+               ttm_manager_type(bdev, src_mem->mem_type);
+       struct ttm_resource src_copy = *src_mem;
This here ^^

Mhm, that's most likely a rebase/merge conflict between my change to subclass ttm_resource which came in through the drm-misc-next tree and Thomas change here.

Thomas can you take a look?


Sure.

/Thomas





Thanks,
Christian.


+       union {
+               struct ttm_kmap_iter_tt tt;
+               struct ttm_kmap_iter_linear_io io;
+       } _dst_iter, _src_iter;
+       struct ttm_kmap_iter *dst_iter, *src_iter;
+       int ret = 0;

-       /*
-        * TTM might be null for moves within the same region.
-        */
-       if (ttm) {
+       if (ttm && ((ttm->page_flags & TTM_PAGE_FLAG_SWAPPED) ||
+                   dst_man->use_tt)) {
                 ret = ttm_tt_populate(bdev, ttm, ctx);
                 if (ret)
-                       goto out1;
+                       return ret;
         }

-       for (i = 0; i < new_mem->num_pages; ++i) {
-               if (old_iomap == NULL) {
-                       pgprot_t prot = ttm_io_prot(bo, old_mem, PAGE_KERNEL);
-                       ret = ttm_copy_ttm_io_page(ttm, new_iomap, i,
-                                                  prot);
-               } else if (new_iomap == NULL) {
-                       pgprot_t prot = ttm_io_prot(bo, new_mem, PAGE_KERNEL);
-                       ret = ttm_copy_io_ttm_page(ttm, old_iomap, i,
-                                                  prot);
-               } else {
-                       ret = ttm_copy_io_page(new_iomap, old_iomap, i);
-               }
-               if (ret)
-                       goto out1;
+       dst_iter = ttm_kmap_iter_linear_io_init(&_dst_iter.io, bdev, dst_mem);
+       if (PTR_ERR(dst_iter) == -EINVAL && dst_man->use_tt)
+               dst_iter = ttm_kmap_iter_tt_init(&_dst_iter.tt, bo->ttm);
+       if (IS_ERR(dst_iter))
+               return PTR_ERR(dst_iter);
+
+       src_iter = ttm_kmap_iter_linear_io_init(&_src_iter.io, bdev, src_mem);
+       if (PTR_ERR(src_iter) == -EINVAL && src_man->use_tt)
+               src_iter = ttm_kmap_iter_tt_init(&_src_iter.tt, bo->ttm);
+       if (IS_ERR(src_iter)) {
+               ret = PTR_ERR(src_iter);
+               goto out_src_iter;
         }
-       mb();
-out2:
-       old_copy = *old_mem;

-       ttm_bo_assign_mem(bo, new_mem);
-
-       if (!man->use_tt)
-               ttm_bo_tt_destroy(bo);
+       ttm_move_memcpy(bo, dst_mem->num_pages, dst_iter, src_iter);
+       src_copy = *src_mem;
+       ttm_bo_move_sync_cleanup(bo, dst_mem);

-out1:
-       ttm_resource_iounmap(bdev, old_mem, new_iomap);
-out:
-       ttm_resource_iounmap(bdev, &old_copy, old_iomap);
+       if (!src_iter->ops->maps_tt)
+ ttm_kmap_iter_linear_io_fini(&_src_iter.io, bdev, &src_copy);
passes a copy into linear_io_fini which calls the driver io_mem_free
without the subclass data.

Dave.




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