From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.5 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B4AB5C388CE for ; Wed, 21 Oct 2020 04:40:52 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3D4B120870 for ; Wed, 21 Oct 2020 04:40:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3D4B120870 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4C0BC6E873; Wed, 21 Oct 2020 04:40:50 +0000 (UTC) Received: from us-smtp-delivery-44.mimecast.com (us-smtp-delivery-44.mimecast.com [207.211.30.44]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4BEE66E873 for ; Wed, 21 Oct 2020 04:40:45 +0000 (UTC) Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-33-bzVUx6d1NSWMnPzd-gFT6A-1; Wed, 21 Oct 2020 00:40:39 -0400 X-MC-Unique: bzVUx6d1NSWMnPzd-gFT6A-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 671E2107ACF7; Wed, 21 Oct 2020 04:40:38 +0000 (UTC) Received: from tyrion-bne-redhat-com.redhat.com (vpn2-54-180.bne.redhat.com [10.64.54.180]) by smtp.corp.redhat.com (Postfix) with ESMTP id 70CF61A7D2; Wed, 21 Oct 2020 04:40:37 +0000 (UTC) From: Dave Airlie To: dri-devel@lists.freedesktop.org Subject: [PATCH 3/3] drm/ttm: avoid multihop moves in drivers. Date: Wed, 21 Oct 2020 14:40:31 +1000 Message-Id: <20201021044031.1752624-4-airlied@gmail.com> In-Reply-To: <20201021044031.1752624-1-airlied@gmail.com> References: <20201021044031.1752624-1-airlied@gmail.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: gmail.com X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: christian.koenig@amd.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Dave Airlie Currently drivers get called to move a buffer, but if they have to move it temporarily through another space (SYSTEM->VRAM via TT) then they can end up with a lot of ttm->driver->ttm call stacks, if the temprorary space moves requires eviction. Instead of letting the driver do all the placement/space for the temporary, allow it to report back (-EMULTIHOP) a placement (hop) to the move code, which will then do the temporary move, and the correct placement move afterwards. This removes a lot of code from drivers, at the expense of adding some midlayering. I've some further ideas on how to turn it inside out, but I think this is a good solution to the call stack problems. Signed-off-by: Dave Airlie --- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 139 +++------------------ drivers/gpu/drm/drm_gem_vram_helper.c | 3 +- drivers/gpu/drm/nouveau/nouveau_bo.c | 115 +++-------------- drivers/gpu/drm/qxl/qxl_ttm.c | 3 +- drivers/gpu/drm/radeon/radeon_ttm.c | 122 +++--------------- drivers/gpu/drm/ttm/ttm_bo.c | 62 +++++++-- drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c | 3 +- include/drm/ttm/ttm_bo_driver.h | 5 +- 8 files changed, 108 insertions(+), 344 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c index 62f9194b1dd1..0fd4f270d794 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -515,119 +515,6 @@ static int amdgpu_move_blit(struct ttm_buffer_object *bo, return r; } -/** - * amdgpu_move_vram_ram - Copy VRAM buffer to RAM buffer - * - * Called by amdgpu_bo_move(). - */ -static int amdgpu_move_vram_ram(struct ttm_buffer_object *bo, bool evict, - struct ttm_operation_ctx *ctx, - struct ttm_resource *new_mem) -{ - struct ttm_resource *old_mem = &bo->mem; - struct ttm_resource tmp_mem; - struct ttm_place placements; - struct ttm_placement placement; - int r; - - /* create space/pages for new_mem in GTT space */ - tmp_mem = *new_mem; - tmp_mem.mm_node = NULL; - placement.num_placement = 1; - placement.placement = &placements; - placement.num_busy_placement = 1; - placement.busy_placement = &placements; - placements.fpfn = 0; - placements.lpfn = 0; - placements.mem_type = TTM_PL_TT; - placements.flags = 0; - r = ttm_bo_mem_space(bo, &placement, &tmp_mem, ctx); - if (unlikely(r)) { - pr_err("Failed to find GTT space for blit from VRAM\n"); - return r; - } - - r = ttm_tt_populate(bo->bdev, bo->ttm, ctx); - if (unlikely(r)) - goto out_cleanup; - - /* Bind the memory to the GTT space */ - r = amdgpu_ttm_backend_bind(bo->bdev, bo->ttm, &tmp_mem); - if (unlikely(r)) { - goto out_cleanup; - } - - /* blit VRAM to GTT */ - r = amdgpu_move_blit(bo, evict, &tmp_mem, old_mem); - if (unlikely(r)) { - goto out_cleanup; - } - - r = ttm_bo_wait_ctx(bo, ctx); - if (unlikely(r)) - goto out_cleanup; - - amdgpu_ttm_backend_unbind(bo->bdev, bo->ttm); - ttm_resource_free(bo, &bo->mem); - ttm_bo_assign_mem(bo, new_mem); -out_cleanup: - ttm_resource_free(bo, &tmp_mem); - return r; -} - -/** - * amdgpu_move_ram_vram - Copy buffer from RAM to VRAM - * - * Called by amdgpu_bo_move(). - */ -static int amdgpu_move_ram_vram(struct ttm_buffer_object *bo, bool evict, - struct ttm_operation_ctx *ctx, - struct ttm_resource *new_mem) -{ - struct ttm_resource *old_mem = &bo->mem; - struct ttm_resource tmp_mem; - struct ttm_placement placement; - struct ttm_place placements; - int r; - - /* make space in GTT for old_mem buffer */ - tmp_mem = *new_mem; - tmp_mem.mm_node = NULL; - placement.num_placement = 1; - placement.placement = &placements; - placement.num_busy_placement = 1; - placement.busy_placement = &placements; - placements.fpfn = 0; - placements.lpfn = 0; - placements.mem_type = TTM_PL_TT; - placements.flags = 0; - r = ttm_bo_mem_space(bo, &placement, &tmp_mem, ctx); - if (unlikely(r)) { - pr_err("Failed to find GTT space for blit to VRAM\n"); - return r; - } - - /* move/bind old memory to GTT space */ - r = ttm_tt_populate(bo->bdev, bo->ttm, ctx); - if (unlikely(r)) - return r; - - r = amdgpu_ttm_backend_bind(bo->bdev, bo->ttm, &tmp_mem); - if (unlikely(r)) { - goto out_cleanup; - } - - ttm_bo_assign_mem(bo, &tmp_mem); - /* copy to VRAM */ - r = amdgpu_move_blit(bo, evict, new_mem, old_mem); - if (unlikely(r)) { - goto out_cleanup; - } -out_cleanup: - ttm_resource_free(bo, &tmp_mem); - return r; -} - /** * amdgpu_mem_visible - Check that memory can be accessed by ttm_bo_move_memcpy * @@ -659,13 +546,25 @@ static bool amdgpu_mem_visible(struct amdgpu_device *adev, */ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict, struct ttm_operation_ctx *ctx, - struct ttm_resource *new_mem) + struct ttm_resource *new_mem, + struct ttm_place *hop) { struct amdgpu_device *adev; struct amdgpu_bo *abo; struct ttm_resource *old_mem = &bo->mem; int r; + if ((old_mem->mem_type == TTM_PL_SYSTEM && + new_mem->mem_type == TTM_PL_VRAM) || + (old_mem->mem_type == TTM_PL_VRAM && + new_mem->mem_type == TTM_PL_SYSTEM)) { + hop->fpfn = 0; + hop->lpfn = 0; + hop->mem_type = TTM_PL_TT; + hop->flags = 0; + return -EMULTIHOP; + } + if (new_mem->mem_type == TTM_PL_TT) { r = amdgpu_ttm_backend_bind(bo->bdev, bo->ttm, new_mem); if (r) @@ -719,16 +618,8 @@ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict, goto memcpy; } - if (old_mem->mem_type == TTM_PL_VRAM && - new_mem->mem_type == TTM_PL_SYSTEM) { - r = amdgpu_move_vram_ram(bo, evict, ctx, new_mem); - } else if (old_mem->mem_type == TTM_PL_SYSTEM && - new_mem->mem_type == TTM_PL_VRAM) { - r = amdgpu_move_ram_vram(bo, evict, ctx, new_mem); - } else { - r = amdgpu_move_blit(bo, evict, - new_mem, old_mem); - } + r = amdgpu_move_blit(bo, evict, + new_mem, old_mem); if (r) { memcpy: diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c index 9da823eb0edd..c51096cc7fb2 100644 --- a/drivers/gpu/drm/drm_gem_vram_helper.c +++ b/drivers/gpu/drm/drm_gem_vram_helper.c @@ -965,7 +965,8 @@ static void bo_driver_delete_mem_notify(struct ttm_buffer_object *bo) static int bo_driver_move(struct ttm_buffer_object *bo, bool evict, struct ttm_operation_ctx *ctx, - struct ttm_resource *new_mem) + struct ttm_resource *new_mem, + struct ttm_place *hop) { struct drm_gem_vram_object *gbo; diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c index acff82afe260..623577412d19 100644 --- a/drivers/gpu/drm/nouveau/nouveau_bo.c +++ b/drivers/gpu/drm/nouveau/nouveau_bo.c @@ -862,96 +862,6 @@ nouveau_bo_move_init(struct nouveau_drm *drm) NV_INFO(drm, "MM: using %s for buffer copies\n", name); } -static int -nouveau_bo_move_flipd(struct ttm_buffer_object *bo, bool evict, - struct ttm_operation_ctx *ctx, - struct ttm_resource *new_reg) -{ - struct ttm_place placement_memtype = { - .fpfn = 0, - .lpfn = 0, - .mem_type = TTM_PL_TT, - .flags = 0 - }; - struct ttm_placement placement; - struct ttm_resource tmp_reg; - int ret; - - placement.num_placement = placement.num_busy_placement = 1; - placement.placement = placement.busy_placement = &placement_memtype; - - tmp_reg = *new_reg; - tmp_reg.mm_node = NULL; - ret = ttm_bo_mem_space(bo, &placement, &tmp_reg, ctx); - if (ret) - return ret; - - ret = ttm_tt_populate(bo->bdev, bo->ttm, ctx); - if (ret) - goto out; - - ret = nouveau_ttm_tt_bind(bo->bdev, bo->ttm, &tmp_reg); - if (ret) - goto out; - - ret = nouveau_bo_move_m2mf(bo, true, ctx, &tmp_reg); - if (ret) - goto out; - - ret = ttm_bo_wait_ctx(bo, ctx); - if (ret) - goto out; - - nouveau_ttm_tt_unbind(bo->bdev, bo->ttm); - ttm_resource_free(bo, &bo->mem); - ttm_bo_assign_mem(bo, &tmp_reg); -out: - ttm_resource_free(bo, &tmp_reg); - return ret; -} - -static int -nouveau_bo_move_flips(struct ttm_buffer_object *bo, bool evict, - struct ttm_operation_ctx *ctx, - struct ttm_resource *new_reg) -{ - struct ttm_place placement_memtype = { - .fpfn = 0, - .lpfn = 0, - .mem_type = TTM_PL_TT, - .flags = 0 - }; - struct ttm_placement placement; - struct ttm_resource tmp_reg; - int ret; - - placement.num_placement = placement.num_busy_placement = 1; - placement.placement = placement.busy_placement = &placement_memtype; - - tmp_reg = *new_reg; - tmp_reg.mm_node = NULL; - ret = ttm_bo_mem_space(bo, &placement, &tmp_reg, ctx); - if (ret) - return ret; - - ret = ttm_tt_populate(bo->bdev, bo->ttm, ctx); - if (unlikely(ret != 0)) - return ret; - - ret = nouveau_ttm_tt_bind(bo->bdev, bo->ttm, &tmp_reg); - if (unlikely(ret != 0)) - return ret; - - ttm_bo_assign_mem(bo, &tmp_reg); - ret = nouveau_bo_move_m2mf(bo, true, ctx, new_reg); - if (ret) - goto out; - -out: - ttm_resource_free(bo, &tmp_reg); - return ret; -} - static void nouveau_bo_move_ntfy(struct ttm_buffer_object *bo, bool evict, struct ttm_resource *new_reg) @@ -1024,7 +934,8 @@ nouveau_bo_vm_cleanup(struct ttm_buffer_object *bo, static int nouveau_bo_move(struct ttm_buffer_object *bo, bool evict, struct ttm_operation_ctx *ctx, - struct ttm_resource *new_reg) + struct ttm_resource *new_reg, + struct ttm_place *hop) { struct nouveau_drm *drm = nouveau_bdev(bo->bdev); struct nouveau_bo *nvbo = nouveau_bo(bo); @@ -1032,6 +943,17 @@ nouveau_bo_move(struct ttm_buffer_object *bo, bool evict, struct nouveau_drm_tile *new_tile = NULL; int ret = 0; + if ((old_reg->mem_type == TTM_PL_SYSTEM && + new_reg->mem_type == TTM_PL_VRAM) || + (old_reg->mem_type == TTM_PL_VRAM && + new_reg->mem_type == TTM_PL_SYSTEM)) { + hop->fpfn = 0; + hop->lpfn = 0; + hop->mem_type = TTM_PL_TT; + hop->flags = 0; + return -EMULTIHOP; + } + if (new_reg->mem_type == TTM_PL_TT) { ret = nouveau_ttm_tt_bind(bo->bdev, bo->ttm, new_reg); if (ret) @@ -1074,15 +996,8 @@ nouveau_bo_move(struct ttm_buffer_object *bo, bool evict, /* Hardware assisted copy. */ if (drm->ttm.move) { - if (new_reg->mem_type == TTM_PL_SYSTEM) - ret = nouveau_bo_move_flipd(bo, evict, ctx, - new_reg); - else if (old_reg->mem_type == TTM_PL_SYSTEM) - ret = nouveau_bo_move_flips(bo, evict, ctx, - new_reg); - else - ret = nouveau_bo_move_m2mf(bo, evict, ctx, - new_reg); + ret = nouveau_bo_move_m2mf(bo, evict, ctx, + new_reg); if (!ret) goto out; } diff --git a/drivers/gpu/drm/qxl/qxl_ttm.c b/drivers/gpu/drm/qxl/qxl_ttm.c index b52a4563b47b..103e4f248f37 100644 --- a/drivers/gpu/drm/qxl/qxl_ttm.c +++ b/drivers/gpu/drm/qxl/qxl_ttm.c @@ -141,7 +141,8 @@ static void qxl_bo_move_notify(struct ttm_buffer_object *bo, static int qxl_bo_move(struct ttm_buffer_object *bo, bool evict, struct ttm_operation_ctx *ctx, - struct ttm_resource *new_mem) + struct ttm_resource *new_mem, + struct ttm_place *hop) { struct ttm_resource *old_mem = &bo->mem; int ret; diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c index 321c09d20c6c..ddb04a2dc25f 100644 --- a/drivers/gpu/drm/radeon/radeon_ttm.c +++ b/drivers/gpu/drm/radeon/radeon_ttm.c @@ -207,110 +207,27 @@ static int radeon_move_blit(struct ttm_buffer_object *bo, return r; } -static int radeon_move_vram_ram(struct ttm_buffer_object *bo, - bool evict, - struct ttm_operation_ctx *ctx, - struct ttm_resource *new_mem) -{ - struct ttm_resource *old_mem = &bo->mem; - struct ttm_resource tmp_mem; - struct ttm_place placements; - struct ttm_placement placement; - int r; - - tmp_mem = *new_mem; - tmp_mem.mm_node = NULL; - placement.num_placement = 1; - placement.placement = &placements; - placement.num_busy_placement = 1; - placement.busy_placement = &placements; - placements.fpfn = 0; - placements.lpfn = 0; - placements.mem_type = TTM_PL_TT; - placements.flags = 0; - r = ttm_bo_mem_space(bo, &placement, &tmp_mem, ctx); - if (unlikely(r)) { - return r; - } - - r = ttm_tt_populate(bo->bdev, bo->ttm, ctx); - if (unlikely(r)) { - goto out_cleanup; - } - - r = radeon_ttm_tt_bind(bo->bdev, bo->ttm, &tmp_mem); - if (unlikely(r)) { - goto out_cleanup; - } - r = radeon_move_blit(bo, true, &tmp_mem, old_mem); - if (unlikely(r)) { - goto out_cleanup; - } - r = ttm_bo_wait_ctx(bo, ctx); - if (unlikely(r)) - goto out_cleanup; - - radeon_ttm_tt_unbind(bo->bdev, bo->ttm); - ttm_resource_free(bo, &bo->mem); - ttm_bo_assign_mem(bo, new_mem); -out_cleanup: - ttm_resource_free(bo, &tmp_mem); - return r; -} - -static int radeon_move_ram_vram(struct ttm_buffer_object *bo, - bool evict, - struct ttm_operation_ctx *ctx, - struct ttm_resource *new_mem) -{ - struct ttm_resource *old_mem = &bo->mem; - struct ttm_resource tmp_mem; - struct ttm_placement placement; - struct ttm_place placements; - int r; - - tmp_mem = *new_mem; - tmp_mem.mm_node = NULL; - placement.num_placement = 1; - placement.placement = &placements; - placement.num_busy_placement = 1; - placement.busy_placement = &placements; - placements.fpfn = 0; - placements.lpfn = 0; - placements.mem_type = TTM_PL_TT; - placements.flags = 0; - r = ttm_bo_mem_space(bo, &placement, &tmp_mem, ctx); - if (unlikely(r)) { - return r; - } - - r = ttm_tt_populate(bo->bdev, bo->ttm, ctx); - if (unlikely(r)) - goto out_cleanup; - - r = radeon_ttm_tt_bind(bo->bdev, bo->ttm, &tmp_mem); - if (unlikely(r)) - goto out_cleanup; - - ttm_bo_assign_mem(bo, &tmp_mem); - r = radeon_move_blit(bo, true, new_mem, old_mem); - if (unlikely(r)) { - goto out_cleanup; - } -out_cleanup: - ttm_resource_free(bo, &tmp_mem); - return r; -} - static int radeon_bo_move(struct ttm_buffer_object *bo, bool evict, struct ttm_operation_ctx *ctx, - struct ttm_resource *new_mem) + struct ttm_resource *new_mem, + struct ttm_place *hop) { struct radeon_device *rdev; struct radeon_bo *rbo; struct ttm_resource *old_mem = &bo->mem; int r; + if ((old_mem->mem_type == TTM_PL_SYSTEM && + new_mem->mem_type == TTM_PL_VRAM) || + (old_mem->mem_type == TTM_PL_VRAM && + new_mem->mem_type == TTM_PL_SYSTEM)) { + hop->fpfn = 0; + hop->lpfn = 0; + hop->mem_type = TTM_PL_TT; + hop->flags = 0; + return -EMULTIHOP; + } + if (new_mem->mem_type == TTM_PL_TT) { r = radeon_ttm_tt_bind(bo->bdev, bo->ttm, new_mem); if (r) @@ -351,17 +268,8 @@ static int radeon_bo_move(struct ttm_buffer_object *bo, bool evict, goto memcpy; } - if (old_mem->mem_type == TTM_PL_VRAM && - new_mem->mem_type == TTM_PL_SYSTEM) { - r = radeon_move_vram_ram(bo, evict, ctx, new_mem); - } else if (old_mem->mem_type == TTM_PL_SYSTEM && - new_mem->mem_type == TTM_PL_VRAM) { - r = radeon_move_ram_vram(bo, evict, ctx, new_mem); - } else { - r = radeon_move_blit(bo, evict, - new_mem, old_mem); - } - + r = radeon_move_blit(bo, evict, + new_mem, old_mem); if (r) { memcpy: r = ttm_bo_move_memcpy(bo, ctx, new_mem); diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c index 5b411252a857..a8830fdf8bc6 100644 --- a/drivers/gpu/drm/ttm/ttm_bo.c +++ b/drivers/gpu/drm/ttm/ttm_bo.c @@ -231,7 +231,8 @@ EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail); static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo, struct ttm_resource *mem, bool evict, - struct ttm_operation_ctx *ctx) + struct ttm_operation_ctx *ctx, + struct ttm_place *hop) { struct ttm_bo_device *bdev = bo->bdev; struct ttm_resource_manager *old_man = ttm_manager_type(bdev, bo->mem.mem_type); @@ -259,9 +260,12 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo, } } - ret = bdev->driver->move(bo, evict, ctx, mem); - if (ret) + ret = bdev->driver->move(bo, evict, ctx, mem, hop); + if (ret) { + if (ret == -EMULTIHOP) + return ret; goto out_err; + } ctx->bytes_moved += bo->num_pages << PAGE_SHIFT; return 0; @@ -596,7 +600,7 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo, goto out; } - ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx); + ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx, NULL); if (unlikely(ret)) { if (ret != -ERESTARTSYS) pr_err("Buffer eviction failed\n"); @@ -936,11 +940,39 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo, } EXPORT_SYMBOL(ttm_bo_mem_space); +static int ttm_bo_bounce_temp_buffer(struct ttm_buffer_object *bo, + struct ttm_resource *mem, + struct ttm_operation_ctx *ctx, + struct ttm_place *hop) +{ + struct ttm_placement hop_placement; + int ret; + struct ttm_resource hop_mem = *mem; + + hop_mem.mm_node = NULL; + hop_mem.mem_type = TTM_PL_SYSTEM; + hop_mem.placement = 0; + + hop_placement.num_placement = hop_placement.num_busy_placement = 1; + hop_placement.placement = hop_placement.busy_placement = hop; + + /* find space in the bounce domain */ + ret = ttm_bo_mem_space(bo, &hop_placement, &hop_mem, ctx); + if (ret) + return ret; + /* move to the bounce domain */ + ret = ttm_bo_handle_move_mem(bo, &hop_mem, false, ctx, NULL); + if (ret) + return ret; + return 0; +} + static int ttm_bo_move_buffer(struct ttm_buffer_object *bo, struct ttm_placement *placement, struct ttm_operation_ctx *ctx) { int ret = 0; + struct ttm_place hop = {}; struct ttm_resource mem; dma_resv_assert_held(bo->base.resv); @@ -954,12 +986,25 @@ static int ttm_bo_move_buffer(struct ttm_buffer_object *bo, /* * Determine where to move the buffer. + * + * If driver determines move is going to need + * an extra step then it will return -EMULTIHOP + * and the buffer will be moved to the temporary + * stop and the driver will be called to make + * the second hop. */ +bounce: ret = ttm_bo_mem_space(bo, placement, &mem, ctx); if (ret) - goto out_unlock; - ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx); -out_unlock: + return ret; + ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx, &hop); + if (ret == -EMULTIHOP) { + ret = ttm_bo_bounce_temp_buffer(bo, &mem, ctx, &hop); + if (ret) + return ret; + /* try and move to final place now. */ + goto bounce; + } if (ret) ttm_resource_free(bo, &mem); return ret; @@ -1435,7 +1480,7 @@ int ttm_bo_swapout(struct ttm_operation_ctx *ctx) evict_mem.placement = 0; evict_mem.mem_type = TTM_PL_SYSTEM; - ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx); + ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx, NULL); if (unlikely(ret != 0)) goto out; } @@ -1481,4 +1526,3 @@ void ttm_bo_tt_destroy(struct ttm_buffer_object *bo) ttm_tt_destroy(bo->bdev, bo->ttm); bo->ttm = NULL; } - diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c index 88be48ad0344..d48b70605a56 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c @@ -731,7 +731,8 @@ static void vmw_swap_notify(struct ttm_buffer_object *bo) static int vmw_move(struct ttm_buffer_object *bo, bool evict, struct ttm_operation_ctx *ctx, - struct ttm_resource *new_mem) + struct ttm_resource *new_mem, + struct ttm_place *hop) { struct ttm_resource_manager *old_man = ttm_manager_type(bo->bdev, bo->mem.mem_type); struct ttm_resource_manager *new_man = ttm_manager_type(bo->bdev, new_mem->mem_type); diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h index 29f6a1d1c853..e4eab7a45ace 100644 --- a/include/drm/ttm/ttm_bo_driver.h +++ b/include/drm/ttm/ttm_bo_driver.h @@ -133,12 +133,15 @@ struct ttm_bo_driver { * the graphics address space * @ctx: context for this move with parameters * @new_mem: the new memory region receiving the buffer + @ @hop: placement for driver directed intermediate hop * * Move a buffer between two memory regions. + * Returns errno -EMULTIHOP if driver requests a hop */ int (*move)(struct ttm_buffer_object *bo, bool evict, struct ttm_operation_ctx *ctx, - struct ttm_resource *new_mem); + struct ttm_resource *new_mem, + struct ttm_place *hop); /** * struct ttm_bo_driver_member verify_access -- 2.27.0 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel