[Intel-gfx] [PATCH v10 03/11] drm/ttm: Add a generic TTM memcpy move for page-based iomem
Christian König
christian.koenig at amd.com
Mon Aug 30 06:16:20 UTC 2021
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?
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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