{"id":103295,"date":"2026-09-10T08:25:00","date_gmt":"2026-09-10T00:25:00","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/103295.html"},"modified":"2026-09-10T08:25:00","modified_gmt":"2026-09-10T00:25:00","slug":"8-3-bo-%e6%a0%a1%e9%aa%8c%e4%b8%8e%e9%a2%84%e7%95%99%ef%bc%9adrm_exec%e3%80%81ttm_bo_validate-%e4%b8%8e-dma_resv-%e7%9a%84%e5%8d%8f%e5%90%8c","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/103295.html","title":{"rendered":"8.3 BO \u6821\u9a8c\u4e0e\u9884\u7559\uff1adrm_exec\u3001ttm_bo_validate \u4e0e dma_resv \u7684\u534f\u540c"},"content":{"rendered":"

8.1 \u52fe\u52d2\u4e86 amdgpu_cs_ioctl \u7684\u4e5d\u6b65\u5168\u666f，8.2 \u8bb2\u89e3\u4e86\u524d\u7aef\u7684 chunk \u89e3\u6790\u4e0e\u4f5c\u4e1a\u6784\u5efa（\u7b2c \u2460\u2014\u2462 \u9636\u6bb5）\u3002\u672c\u8282\u627f\u63a5\u5176\u540e，\u805a\u7126\u7b2c \u2463 \u9636\u6bb5 amdgpu_cs_parser_bos\u2014\u2014\u6574\u6761\u8def\u5f84\u4e2d\u6700\u5173\u952e\u7684\u8282\u70b9\u4e4b\u4e00，\u5256\u6790\u5185\u6838\u5982\u4f55\u5728\u4e00\u81f4\u7684\u52a0\u9501\u4fdd\u62a4\u4e0b，\u5c06\u672c\u6b21\u63d0\u4ea4\u6d89\u53ca\u7684\u6240\u6709 BO \u62c9\u56de\u5230 GPU \u53ef\u8bbf\u95ee\u7684\u5185\u5b58\u57df，\u5e76\u4e3a\u540e\u7eed\u7684\u9875\u8868\u66f4\u65b0\u4e0e\u4f5c\u4e1a\u5165\u961f\u5960\u5b9a\u57fa\u7840\u3002<\/p>\n

\u4e00\u6b21\u547d\u4ee4\u63d0\u4ea4\u8981\u6b63\u786e\u6267\u884c，\u524d\u63d0\u662f\u5176\u5f15\u7528\u7684\u6bcf\u4e00\u4e2a BO \u90fd\u6ee1\u8db3\u4e24\u4e2a\u6761\u4ef6：\u5176\u4e00，\u88ab\u7a33\u5b9a\u5730\u9501\u5b9a，\u4f7f\u5f97\u4ece\u6821\u9a8c\u5230\u5165\u961f\u7684\u6574\u4e2a\u7a97\u53e3\u5185\u6ca1\u6709\u5176\u4ed6\u7ebf\u7a0b\u80fd\u591f\u9a71\u9010\u6216\u642c\u79fb\u5b83；\u5176\u4e8c，\u5904\u4e8e\u5408\u6cd5\u7684\u5185\u5b58\u57df（VRAM \u6216 GTT），\u5373\u5df2\u5b8c\u6210\u9a7b\u7559（resident）\u5e76\u5177\u5907\u6709\u6548\u7684 GPU \u6620\u5c04\u3002amdgpu_cs_parser_bos \u6b63\u662f\u540c\u65f6\u8fbe\u6210\u8fd9\u4e24\u70b9\u7684\u73af\u8282，\u5176\u5185\u90e8\u7531\u4e09\u79cd\u673a\u5236\u534f\u540c\u5b8c\u6210\u2014\u2014drm_exec \u8d1f\u8d23\u52a0\u9501\u3001ttm_bo_validate \u8d1f\u8d23\u56de\u8fc1\u3001dma_resv \u5219\u4f5c\u4e3a\u4e8c\u8005\u5171\u540c\u64cd\u4f5c\u7684\u9501\u4e0e\u6805\u680f\u5bb9\u5668\u3002<\/p>\n

1. drm_exec：\u672c\u9636\u6bb5\u5982\u4f55\u9501\u5b9a\u5168\u90e8 BO<\/h3>\n

\u547d\u4ee4\u63d0\u4ea4\u9700\u8981\u540c\u65f6\u9501\u5b9a\u7684 BO \u5f80\u5f80\u6570\u4ee5\u767e\u8ba1，\u4e14\u4e0d\u540c\u63d0\u4ea4\u6240\u5f15\u7528\u7684\u96c6\u5408\u5f7c\u6b64\u4ea4\u53e0\u3002\u82e5\u4ee5\u4e0d\u4e00\u81f4\u7684\u987a\u5e8f\u9010\u4e2a\u52a0\u9501，\u6781\u6613\u5f62\u6210 ABBA \u6b7b\u9501\u3002DRM \u5c06\u300c\u65e0\u6b7b\u9501\u5730\u4e00\u6b21\u6027\u9501\u5b9a\u4e00\u7ec4 dma_resv\u300d\u8fd9\u4e00\u901a\u7528\u95ee\u9898\u62bd\u8c61\u4e3a drm_exec \u6846\u67b6\u2014\u2014\u5176\u5e95\u5c42\u57fa\u4e8e ww_mutex（wait\/wound \u4e92\u65a5\u9501，DRM \u7684 reservation_ww_class \u91c7\u7528 Wait-Die \u7b97\u6cd5），\u628a\u300c\u9884\u7559\u2014\u7ade\u4e89\u2014\u56de\u9000\u2014\u91cd\u8bd5\u300d\u7684\u5b8c\u6574\u903b\u8f91\u5c01\u88c5\u4e3a\u4e00\u7ec4\u5b8f\u3002\u8be5\u6846\u67b6\u7684\u539f\u7406\u4e0e\u5b9e\u73b0\u5c5e\u4e8e\u540c\u6b65\u673a\u5236\u8303\u7574，\u672c\u4e13\u680f\u5728 6.3.3 drm_exec \u2014 \u591a BO \u65e0\u6b7b\u9501\u52a0\u9501\u6846\u67b6 \u4e2d\u5df2\u4e13\u6587\u8be6\u8ff0；\u672c\u8282\u4ec5\u4ece\u63d0\u4ea4\u6d41\u7a0b\u7684\u5e94\u7528\u89c6\u89d2\u8bf4\u660e\u5b83\u5982\u4f55\u88ab\u4f7f\u7528\u3002<\/p>\n

\u5728\u5c55\u5f00\u52a0\u9501\u524d，parser_bos \u9996\u5148\u53d6\u5f97\u4e00\u628a\u8d2f\u7a7f\u5168\u51fd\u6570\u7684\u5916\u5c42\u9501 mutex_lock(&p->bo_list->bo_list_mutex)，\u4ee5\u9632 bo_list \u5728\u6574\u4e2a\u63d0\u4ea4\u671f\u95f4\u88ab\u5e76\u53d1\u4fee\u6539；\u8be5\u9501\u5728\u51fd\u6570\u8fd4\u56de（\u65e0\u8bba\u6210\u529f\u6216\u5931\u8d25）\u65f6\u91ca\u653e\u3002\u968f\u540e\u8fdb\u5165 drm_exec，\u9501\u5b9a\u6240\u6709\u5bf9\u8c61\u7684\u6838\u5fc3\u7ed3\u6784\u5982\u4e0b：<\/p>\n

drm_exec_until_all_locked<\/span>(<\/span>&<\/span>p-><\/span>exec)<\/span> {<\/span>
\n r =<\/span> amdgpu_vm_lock_pd<\/span>(<\/span>&<\/span>fpriv-><\/span>vm,<\/span> &<\/span>p-><\/span>exec,<\/span> 1<\/span> +<\/span> p-><\/span>gang_size)<\/span>;<\/span>
\n drm_exec_retry_on_contention<\/span>(<\/span>&<\/span>p-><\/span>exec)<\/span>;<\/span>
\n if<\/span> (<\/span>unlikely<\/span>(<\/span>r)<\/span>)<\/span>
\n goto<\/span> out_free_user_pages;<\/span><\/p>\n

amdgpu_bo_list_for_each_entry<\/span>(<\/span>e,<\/span> p-><\/span>bo_list)<\/span> {<\/span>
\n r =<\/span> drm_exec_prepare_obj<\/span>(<\/span>&<\/span>p-><\/span>exec,<\/span> &<\/span>e-><\/span>bo-><\/span>tbo.<\/span>base,<\/span>
\n TTM_NUM_MOVE_FENCES +<\/span> p-><\/span>gang_size)<\/span>;<\/span>
\n drm_exec_retry_on_contention<\/span>(<\/span>&<\/span>p-><\/span>exec)<\/span>;<\/span>
\n if<\/span> (<\/span>unlikely<\/span>(<\/span>r)<\/span>)<\/span>
\n goto<\/span> out_free_user_pages;<\/span><\/p>\n

e-><\/span>bo_va =<\/span> amdgpu_vm_bo_find<\/span>(<\/span>vm,<\/span> e-><\/span>bo)<\/span>;<\/span>
\n }<\/span><\/p>\n

if<\/span> (<\/span>p-><\/span>uf_bo)<\/span> {<\/span>
\n r =<\/span> drm_exec_prepare_obj<\/span>(<\/span>&<\/span>p-><\/span>exec,<\/span> &<\/span>p-><\/span>uf_bo-><\/span>tbo.<\/span>base,<\/span>
\n TTM_NUM_MOVE_FENCES +<\/span> p-><\/span>gang_size)<\/span>;<\/span>
\n drm_exec_retry_on_contention<\/span>(<\/span>&<\/span>p-><\/span>exec)<\/span>;<\/span>
\n .<\/span>.<\/span>.<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\u5c31\u672c\u9636\u6bb5\u800c\u8a00，\u53ea\u9700\u628a\u63e1 drm_exec \u7684\u4e09\u4e2a\u4f7f\u7528\u8981\u70b9（\u5176\u5185\u90e8\u56de\u9000\u673a\u5236\u89c1 6.3.3）：<\/p>\n\n\u6784\u4ef6\u5728 parser_bos \u4e2d\u7684\u4f5c\u7528<\/tr>\n\n\n\n\n\n\n
drm_exec_until_all_locked(&p->exec)<\/td>\n\u5916\u5c42\u5faa\u73af：\u82e5\u5faa\u73af\u4f53\u5185\u4efb\u4e00\u5bf9\u8c61\u52a0\u9501\u906d\u9047\u7ade\u4e89，\u5219\u56de\u9000\u6240\u6709\u5df2\u6301\u6709\u7684\u9501\u5e76\u4ece\u5934\u91cd\u6267，\u76f4\u81f3\u4e00\u6b21\u6027\u9501\u5b9a\u5168\u90e8\u5bf9\u8c61<\/td>\n<\/tr>\n
amdgpu_vm_lock_pd<\/td>\n\u9996\u5148\u9501\u5b9a\u8be5\u8fdb\u7a0b VM \u7684\u9875\u76ee\u5f55 BO（PD）\u2014\u2014\u7b2c \u2465 \u9636\u6bb5\u9875\u8868\u66f4\u65b0\u5c06\u4fee\u6539\u5b83，\u6545\u5fc5\u987b\u4e00\u5e76\u7eb3\u5165\u9501\u96c6<\/td>\n<\/tr>\n
drm_exec_prepare_obj(exec, &bo->tbo.base, N)<\/td>\n\u9501\u5b9a\u5355\u4e2a BO \u7684 dma_resv，\u5e76\u4e3a\u5176\u9884\u7559 N \u4e2a fence slot（TTM_NUM_MOVE_FENCES + gang_size）<\/td>\n<\/tr>\n
drm_exec_retry_on_contention<\/td>\n\u68c0\u6d4b\u5230\u9501\u7ade\u4e89\u65f6\u8df3\u56de\u5916\u5c42\u5faa\u73af\u5934\u89e6\u53d1\u56de\u9000<\/td>\n<\/tr>\n
p->uf_bo<\/td>\nuser-fence BO：\u82e5\u63d0\u4ea4\u8bf7\u6c42\u5c06\u5b8c\u6210\u4fe1\u53f7\u5199\u5165\u67d0 BO，\u5219\u8be5 BO \u4e5f\u987b\u9501\u5b9a<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5faa\u73af\u4f53\u5185\u5728\u9501\u5b9a\u6bcf\u4e2a BO \u7684\u540c\u65f6，\u8fd8\u901a\u8fc7 amdgpu_vm_bo_find \u67e5\u51fa\u5176 bo_va \u6620\u5c04\u53e5\u67c4\u5e76\u7f13\u5b58\u81f3 e->bo_va，\u4f9b\u7b2c \u2465 \u9636\u6bb5 vm_handling \u76f4\u63a5\u590d\u7528，\u7701\u53bb\u5c4a\u65f6\u7684\u91cd\u590d\u67e5\u627e\u3002<\/p>\n

\u503c\u5f97\u5f3a\u8c03\u7684\u662f fence slot \u9884\u7559（drm_exec_prepare_obj \u7684\u7b2c\u4e09\u53c2\u6570）\u3002\u7b2c \u2467 \u9636\u6bb5 submit \u5728 notifier_lock \u4fdd\u62a4\u4e0b\u56de\u5199 fence \u65f6\u7981\u6b62\u4efb\u4f55\u5185\u5b58\u5206\u914d，\u56e0\u6b64\u6240\u9700\u7684 dma_resv fence slot \u5fc5\u987b\u5728\u6b64\u523b\u63d0\u524d\u9884\u7559\u59a5\u5f53\u3002gang \u63d0\u4ea4（\u4e00\u6b21\u63d0\u4ea4\u591a\u4e2a job）\u4f1a\u4e3a\u6bcf\u4e2a job \u5404\u5360\u4e00\u4e2a slot，\u6545\u9884\u7559\u6570\u542b gang_size\u3002<\/p>\n

bo_list \u5404 BO<\/p>\n

VM \u9875\u76ee\u5f55<\/p>\n

drm_exec<\/p>\n

parser_bos<\/p>\n

bo_list \u5404 BO<\/p>\n

VM \u9875\u76ee\u5f55<\/p>\n

drm_exec<\/p>\n

parser_bos<\/p>\n

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alt<\/p>\n

[\u53d1\u751f\u7ade\u4e89]<\/p>\n

loop<\/p>\n

[\u6bcf\u4e2a BO]<\/p>\n

loop<\/p>\n

[until_all_locked]<\/p>\n

\u5168\u90e8\u5bf9\u8c61\u4e00\u6b21\u6027\u9501\u5b9a\u6210\u529f\u540e\u9000\u51fa\u5faa\u73af<\/p>\n

amdgpu_vm_lock_pd<\/p>\n

1<\/p>\n

\u9501\u5b9a PD \u7684 dma_resv<\/p>\n

2<\/p>\n

drm_exec_prepare_obj(bo, \u9884\u7559 N slot)<\/p>\n

3<\/p>\n

\u9501\u5b9a dma_resv<\/p>\n

4<\/p>\n

retry_on_contention \u2192 \u56de\u9000\u5168\u90e8\u9501，\u91cd\u6765<\/p>\n

5<\/p>\n

2. userptr：\u52a0\u9501\u4e4b\u524d\u7684\u9875\u9762\u6293\u53d6<\/h3>\n

\u5bf9\u4e8e\u7528\u6237\u6307\u9488\u578b BO（userptr，\u5373\u4ee5\u8fdb\u7a0b\u865a\u62df\u5730\u5740\u6ce8\u518c\u3001\u65e0\u72ec\u7acb\u663e\u5b58\u540e\u5907\u7684 BO），parser_bos \u5728\u8fdb\u5165 drm_exec \u52a0\u9501\u5faa\u73af\u4e4b\u524d\u5148\u884c\u6293\u53d6\u5176\u540e\u5907\u9875\u9762：<\/p>\n

amdgpu_bo_list_for_each_userptr_entry<\/span>(<\/span>e,<\/span> p-><\/span>bo_list)<\/span> {<\/span>
\n e-><\/span>range =<\/span> amdgpu_hmm_range_alloc<\/span>(<\/span>NULL<\/span>)<\/span>;<\/span>
\n r =<\/span> amdgpu_ttm_tt_get_user_pages<\/span>(<\/span>bo,<\/span> e-><\/span>range)<\/span>;<\/span>
\n .<\/span>.<\/span>.<\/span>
\n for<\/span> (<\/span>i =<\/span> 0<\/span>;<\/span> i <<\/span> bo-><\/span>tbo.<\/span>ttm-><\/span>num_pages;<\/span> i++<\/span>)<\/span>
\n if<\/span> (<\/span>bo-><\/span>tbo.<\/span>ttm-><\/span>pages[<\/span>i]<\/span> !=<\/span> hmm_pfn_to_page<\/span>(<\/span>.<\/span>.<\/span>.<\/span>)<\/span>)<\/span>
\n userpage_invalidated =<\/span> true;<\/span>
\n e-><\/span>user_invalidated =<\/span> userpage_invalidated;<\/span>
\n}<\/span><\/p>\n

\u5173\u952e\u70b9：<\/p>\n

    \n
  • HMM range：\u901a\u8fc7 amdgpu_hmm_range_alloc \u5206\u914d\u4e00\u6bb5 HMM range，\u518d\u7531 amdgpu_ttm_tt_get_user_pages \u8d70 hmm_range_fault \u8def\u5f84\u6293\u53d6\u5f53\u524d\u6709\u6548\u7684\u7269\u7406\u9875\u3002HMM \u4f7f\u5185\u6838\u5f97\u4ee5\u5728\u4e0d pin \u4f4f\u9875\u9762\u7684\u524d\u63d0\u4e0b\u8ffd\u8e2a\u5176\u53d8\u5316\u2014\u2014\u82e5 CPU \u4fa7\u53d1\u751f\u8fc1\u79fb\u6216\u6362\u51fa，mmu_notifier \u4f1a\u901a\u77e5\u9a71\u52a8\u3002<\/li>\n
  • \u5931\u6548\u6807\u8bb0：\u5c06\u65b0\u6293\u53d6\u7684\u9875\u4e0e BO \u5f53\u524d\u8bb0\u5f55\u7684\u9875\u9010\u4e00\u6bd4\u5bf9，\u82e5\u4e0d\u4e00\u81f4\u5219\u7f6e user_invalidated，\u7559\u5f85\u52a0\u9501\u4e4b\u540e\u5904\u7406\u3002<\/li>\n
  • \u987a\u5e8f\u8003\u91cf：get_user_pages \u53ef\u80fd\u89e6\u53d1\u7f3a\u9875\u3001\u7761\u7720\u4e43\u81f3\u5185\u5b58\u56de\u6536，\u6545\u4e0d\u80fd\u5728\u6301\u6709 dma_resv \u9501\u65f6\u6267\u884c；\u56e0\u6b64\u8be5\u6b65\u9aa4\u5fc5\u987b\u524d\u7f6e\u4e8e drm_exec \u5faa\u73af\u3002<\/li>\n<\/ul>\n

    \u52a0\u9501\u5b8c\u6210\u540e，\u624d\u5bf9\u88ab\u6807\u8bb0\u5931\u6548\u7684 userptr \u505a\u6821\u9a8c\u4e0e\u9875\u9762\u56de\u586b：<\/p>\n

    amdgpu_bo_list_for_each_userptr_entry<\/span>(<\/span>e,<\/span> p-><\/span>bo_list)<\/span> {<\/span>
    \n usermm =<\/span> amdgpu_ttm_tt_get_usermm<\/span>(<\/span>e-><\/span>bo-><\/span>tbo.<\/span>ttm)<\/span>;<\/span>
    \n if<\/span> (<\/span>usermm &&<\/span> usermm !=<\/span> current-><\/span>mm)<\/span>
    \n return<\/span> –<\/span>EPERM;<\/span> \/* \u7981\u6b62\u8de8\u8fdb\u7a0b\u5f15\u7528\u4ed6\u4eba\u7684 userptr *\/<\/span><\/p>\n

    if<\/span> (<\/span>amdgpu_ttm_tt_is_userptr<\/span>(<\/span>.<\/span>.<\/span>.<\/span>)<\/span> &&<\/span> e-><\/span>user_invalidated)<\/span> {<\/span>
    \n amdgpu_bo_placement_from_domain<\/span>(<\/span>e-><\/span>bo,<\/span> AMDGPU_GEM_DOMAIN_CPU)<\/span>;<\/span>
    \n ttm_bo_validate<\/span>(<\/span>&<\/span>e-><\/span>bo-><\/span>tbo,<\/span> &<\/span>e-><\/span>bo-><\/span>placement,<\/span> &<\/span>ctx)<\/span>;<\/span>
    \n amdgpu_ttm_tt_set_user_pages<\/span>(<\/span>e-><\/span>bo-><\/span>tbo.<\/span>ttm,<\/span> e-><\/span>range)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    \u5373：\u5148\u505a\u5f52\u5c5e\u6821\u9a8c（userptr \u53ea\u80fd\u7531\u6ce8\u518c\u5b83\u7684\u8fdb\u7a0b\u5f15\u7528），\u518d\u5bf9\u5931\u6548\u8005\u91cd\u65b0\u7ed1\u5b9a\u65b0\u9875\u3002\u6b64\u5904 userptr \u4e0e SVM\/HMM \u7684\u7f3a\u9875\u5904\u7406\u540c\u6e90，\u8be6\u89c1\u7b2c\u5341\u7ae0\u3002<\/p>\n

    3. ttm_bo_validate：\u628a BO \u62c9\u56de\u5408\u6cd5\u5185\u5b58\u57df<\/h3>\n

    \u9501\u5b9a\u5c31\u7eea\u540e，parser_bos \u4f9d\u6b21\u6821\u9a8c\u6240\u6709\u5bf9\u8c61\u7684\u9a7b\u7559\u72b6\u6001\u3002\u771f\u6b63\u7684\u642c\u79fb\u7531 amdgpu_cs_bo_validate \u5b8c\u6210，\u5176\u5185\u90e8\u5c01\u88c5 ttm_bo_validate：<\/p>\n

    static<\/span> int<\/span> amdgpu_cs_bo_validate<\/span>(<\/span>void<\/span> *<\/span>param,<\/span> struct<\/span> amdgpu_bo<\/span> *<\/span>bo)<\/span>
    \n{<\/span>
    \n struct<\/span> ttm_operation_ctx<\/span> ctx =<\/span> {<\/span>
    \n .<\/span>interruptible =<\/span> true,<\/span>
    \n .<\/span>no_wait_gpu =<\/span> false,<\/span>
    \n .<\/span>resv =<\/span> bo-><\/span>tbo.<\/span>base.<\/span>resv,<\/span>
    \n }<\/span>;<\/span>
    \n .<\/span>.<\/span>.<\/span>
    \n if<\/span> (<\/span>bo-><\/span>tbo.<\/span>pin_count)<\/span>
    \n return<\/span> 0<\/span>;<\/span> \/* \u5df2 pin，\u65e0\u987b\u642c\u79fb *\/<\/span><\/p>\n

    \/* \u4f9d\u636e move \u914d\u989d\u9009\u62e9\u76ee\u6807\u57df *\/<\/span>
    \n if<\/span> (<\/span>p-><\/span>bytes_moved <<\/span> p-><\/span>bytes_moved_threshold &&<\/span> .<\/span>.<\/span>.<\/span>)<\/span>
    \n domain =<\/span> bo-><\/span>preferred_domains;<\/span>
    \n else<\/span>
    \n domain =<\/span> bo-><\/span>allowed_domains;<\/span><\/p>\n

    retry:<\/span>
    \n amdgpu_bo_placement_from_domain<\/span>(<\/span>bo,<\/span> domain)<\/span>;<\/span>
    \n r =<\/span> ttm_bo_validate<\/span>(<\/span>&<\/span>bo-><\/span>tbo,<\/span> &<\/span>bo-><\/span>placement,<\/span> &<\/span>ctx)<\/span>;<\/span>
    \n p-><\/span>bytes_moved +=<\/span> ctx.<\/span>bytes_moved;<\/span>
    \n if<\/span> (<\/span>r ==<\/span> –<\/span>ENOMEM &&<\/span> domain !=<\/span> bo-><\/span>allowed_domains)<\/span> {<\/span>
    \n domain =<\/span> bo-><\/span>allowed_domains;<\/span> \/* \u964d\u7ea7\u91cd\u8bd5 *\/<\/span>
    \n goto<\/span> retry;<\/span>
    \n }<\/span>
    \n return<\/span> r;<\/span>
    \n}<\/span><\/p>\n

    \u8981\u70b9：<\/p>\n

      \n
    • move \u8282\u6d41（throttling）：p->bytes_moved \u4e0e bytes_moved_threshold \u6784\u6210\u4e00\u6b21\u63d0\u4ea4\u7684\u642c\u79fb\u9884\u7b97\u3002\u9884\u7b97\u5145\u8db3\u65f6\u4f7f\u7528 BO \u7684 preferred_domains（\u901a\u5e38\u4e3a\u9ad8\u5e26\u5bbd\u7684 VRAM）；\u9884\u7b97\u8017\u5c3d\u5219\u9000\u8ba9\u81f3 allowed_domains（\u542b GTT），\u4ee5\u907f\u514d\u5355\u6b21\u63d0\u4ea4\u628a\u6574\u5757 VRAM \u8017\u5c3d\u800c\u997f\u6b7b\u5176\u4ed6\u8fdb\u7a0b\u3002\u53ef\u89c1 VRAM（bytes_moved_vis）\u53e6\u6709\u72ec\u7acb\u914d\u989d\u3002<\/li>\n
    • \u57df\u964d\u7ea7\u91cd\u8bd5：\u82e5\u9996\u9009\u57df\u56e0 -ENOMEM \u65e0\u6cd5\u5bb9\u7eb3，\u5219\u964d\u7ea7\u5230 allowed_domains \u518d\u8bd5\u4e00\u6b21\u2014\u2014\u8fd9\u4fdd\u8bc1\u4e86\u5373\u4fbf VRAM \u7d27\u5f20，\u63d0\u4ea4\u4ecd\u80fd\u4ee5 GTT \u9a7b\u7559\u7684\u65b9\u5f0f\u6210\u529f，\u800c\u975e\u76f4\u63a5\u5931\u8d25\u3002<\/li>\n
    • ctx.resv：\u5c06 ttm_bo_validate \u7684\u64cd\u4f5c\u7ed1\u5b9a\u5230\u8be5 BO \u5df2\u9501\u5b9a\u7684 dma_resv，\u4f7f TTM \u5185\u90e8\u7684\u9a71\u9010\u7b49\u5f85\u4e0e\u672c\u9636\u6bb5\u7684\u9501\u4fdd\u6301\u4e00\u81f4\u3002<\/li>\n<\/ul>\n

      parser_bos \u5206\u4e24\u8f6e\u89e6\u53d1\u6821\u9a8c：\u5148\u7ecf amdgpu_vm_validate \u6821\u9a8c VM \u81ea\u8eab\u7684\u9875\u8868\u76f8\u5173 BO，\u518d\u904d\u5386 drm_exec \u5df2\u9501\u5b9a\u7684\u6bcf\u4e2a\u5bf9\u8c61\u9010\u4e00 amdgpu_cs_bo_validate：<\/p>\n

      r =<\/span> amdgpu_vm_validate<\/span>(<\/span>p-><\/span>adev,<\/span> &<\/span>fpriv-><\/span>vm,<\/span> NULL<\/span>,<\/span> amdgpu_cs_bo_validate,<\/span> p)<\/span>;<\/span>
      \n.<\/span>.<\/span>.<\/span>
      \ndrm_exec_for_each_locked_object<\/span>(<\/span>&<\/span>p-><\/span>exec,<\/span> index,<\/span> obj)<\/span> {<\/span>
      \n r =<\/span> amdgpu_cs_bo_validate<\/span>(<\/span>p,<\/span> gem_to_amdgpu_bo<\/span>(<\/span>obj)<\/span>)<\/span>;<\/span>
      \n .<\/span>.<\/span>.<\/span>
      \n}<\/span><\/p>\n

      4. \u4e09\u8005\u534f\u540c\u7684\u5168\u666f<\/h3>\n

      \u81f3\u6b64\u53ef\u4ee5\u770b\u6e05 drm_exec\u3001ttm_bo_validate\u3001dma_resv \u4e09\u8005\u7684\u5206\u5de5\u4e0e\u8026\u5408：<\/p>\n\n\u673a\u5236\u804c\u8d23\u5728\u672c\u9636\u6bb5\u7684\u4f53\u73b0<\/tr>\n\n\n\n\n
      dma_resv<\/td>\n\u6bcf\u4e2a BO \u7684\u9501 + fence \u5bb9\u5668<\/td>\n\u65e2\u662f drm_exec \u9501\u5b9a\u7684\u5bf9\u8c61，\u4e5f\u662f ttm_bo_validate \u4f9d\u636e\u7684 ctx.resv，\u8fd8\u662f \u2467 \u9636\u6bb5\u56de\u5199 fence \u7684\u843d\u70b9<\/td>\n<\/tr>\n
      drm_exec<\/td>\n\u65e0\u6b7b\u9501\u5730\u4e00\u6b21\u6027\u9501\u5b9a\u5168\u90e8 BO \u7684 dma_resv<\/td>\nuntil_all_locked + prepare_obj + retry_on_contention，\u5e76\u9884\u7559 fence slot<\/td>\n<\/tr>\n
      ttm_bo_validate<\/td>\n\u5c06 BO \u56de\u8fc1\u81f3\u5408\u6cd5\u5185\u5b58\u57df\u5e76\u5efa\u7acb\u9a7b\u7559<\/td>\n\u7531 amdgpu_cs_bo_validate \u5c01\u88c5，\u914d\u5408 move \u8282\u6d41\u4e0e\u57df\u964d\u7ea7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      \u4e09\u8005\u4ee5 dma_resv \u4e3a\u4ea4\u6c47\u70b9：drm_exec \u9501\u5b9a\u5b83\u3001ttm_bo_validate \u5728\u5b83\u7684\u4fdd\u62a4\u4e0b\u642c\u79fb\u3001submit \u6700\u7ec8\u5411\u5b83\u56de\u5199\u5b8c\u6210 fence\u3002\u8fd9\u4e00\u8bbe\u8ba1\u4f7f\u5f97"\u9501\u5b9a\u2014\u9a8c\u8bc1\u2014\u56de\u5199"\u5728\u540c\u4e00\u628a\u9501\u7684\u8bed\u4e49\u4e0b\u524d\u540e\u8fde\u8d2f，\u65e0\u7f1d\u8854\u63a5\u3002<\/p>\n

      #mermaid-svg-qmZvOX3ugTwqMsK6{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-qmZvOX3ugTwqMsK6 .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-qmZvOX3ugTwqMsK6 .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-qmZvOX3ugTwqMsK6 .error-icon{fill:#552222;}#mermaid-svg-qmZvOX3ugTwqMsK6 .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-qmZvOX3ugTwqMsK6 .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-qmZvOX3ugTwqMsK6 .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-qmZvOX3ugTwqMsK6 .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-qmZvOX3ugTwqMsK6 .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-qmZvOX3ugTwqMsK6 .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-qmZvOX3ugTwqMsK6 .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-qmZvOX3ugTwqMsK6 .marker{fill:#333333;stroke:#333333;}#mermaid-svg-qmZvOX3ugTwqMsK6 .marker.cross{stroke:#333333;}#mermaid-svg-qmZvOX3ugTwqMsK6 svg{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-qmZvOX3ugTwqMsK6 p{margin:0;}#mermaid-svg-qmZvOX3ugTwqMsK6 .label{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;color:#333;}#mermaid-svg-qmZvOX3ugTwqMsK6 .cluster-label text{fill:#333;}#mermaid-svg-qmZvOX3ugTwqMsK6 .cluster-label span{color:#333;}#mermaid-svg-qmZvOX3ugTwqMsK6 .cluster-label span p{background-color:transparent;}#mermaid-svg-qmZvOX3ugTwqMsK6 .label text,#mermaid-svg-qmZvOX3ugTwqMsK6 span{fill:#333;color:#333;}#mermaid-svg-qmZvOX3ugTwqMsK6 .node rect,#mermaid-svg-qmZvOX3ugTwqMsK6 .node circle,#mermaid-svg-qmZvOX3ugTwqMsK6 .node ellipse,#mermaid-svg-qmZvOX3ugTwqMsK6 .node polygon,#mermaid-svg-qmZvOX3ugTwqMsK6 .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-qmZvOX3ugTwqMsK6 .rough-node .label text,#mermaid-svg-qmZvOX3ugTwqMsK6 .node .label text,#mermaid-svg-qmZvOX3ugTwqMsK6 .image-shape .label,#mermaid-svg-qmZvOX3ugTwqMsK6 .icon-shape .label{text-anchor:middle;}#mermaid-svg-qmZvOX3ugTwqMsK6 .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-qmZvOX3ugTwqMsK6 .rough-node .label,#mermaid-svg-qmZvOX3ugTwqMsK6 .node .label,#mermaid-svg-qmZvOX3ugTwqMsK6 .image-shape .label,#mermaid-svg-qmZvOX3ugTwqMsK6 .icon-shape .label{text-align:center;}#mermaid-svg-qmZvOX3ugTwqMsK6 .node.clickable{cursor:pointer;}#mermaid-svg-qmZvOX3ugTwqMsK6 .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-qmZvOX3ugTwqMsK6 .arrowheadPath{fill:#333333;}#mermaid-svg-qmZvOX3ugTwqMsK6 .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-qmZvOX3ugTwqMsK6 .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-qmZvOX3ugTwqMsK6 .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-qmZvOX3ugTwqMsK6 .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-qmZvOX3ugTwqMsK6 .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-qmZvOX3ugTwqMsK6 .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-qmZvOX3ugTwqMsK6 .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-qmZvOX3ugTwqMsK6 .cluster text{fill:#333;}#mermaid-svg-qmZvOX3ugTwqMsK6 .cluster span{color:#333;}#mermaid-svg-qmZvOX3ugTwqMsK6 div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-qmZvOX3ugTwqMsK6 .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-qmZvOX3ugTwqMsK6 rect.text{fill:none;stroke-width:0;}#mermaid-svg-qmZvOX3ugTwqMsK6 .icon-shape,#mermaid-svg-qmZvOX3ugTwqMsK6 .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-qmZvOX3ugTwqMsK6 .icon-shape p,#mermaid-svg-qmZvOX3ugTwqMsK6 .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-qmZvOX3ugTwqMsK6 .icon-shape .label rect,#mermaid-svg-qmZvOX3ugTwqMsK6 .image-shape .label rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-qmZvOX3ugTwqMsK6 .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-qmZvOX3ugTwqMsK6 .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-qmZvOX3ugTwqMsK6 :root{–mermaid-font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;}<\/p>\n

      <\/p>\n

      \u9501\u5b9a<\/p>\n

      <\/span><\/p>\n

      <\/p>\n

      ctx.resv \u4fdd\u62a4\u4e0b\u642c\u79fb<\/p>\n

      <\/span><\/p>\n

      <\/p>\n

      add_fence \u81f3\u9884\u7559 slot<\/p>\n

      <\/span><\/p>\n

      <\/p>\n

      \u9884\u7559 slot \u4f9b<\/p>\n

      <\/span><\/p>\n

      <\/p>\n

      \u9a7b\u7559\u5c31\u7eea\u540e\u4ea4\u7531<\/p>\n

      <\/span><\/p>\n

      <\/p>\n

      BO \u7684 dma_resv（\u9501 + fence \u5bb9\u5668）<\/p>\n

      <\/span><\/p>\n

      <\/p>\n

      drm_exec\u65e0\u6b7b\u9501\u52a0\u9501<\/p>\n

      <\/span><\/p>\n

      <\/p>\n

      ttm_bo_validate\u56de\u8fc1\u81f3\u5408\u6cd5\u57df<\/p>\n

      <\/span><\/p>\n

      <\/p>\n

      submit \u2467\u56de\u5199\u5b8c\u6210 fence<\/p>\n

      <\/span><\/p>\n

      5. \u6536\u5c3e：user-fence BO \u4e0e GDS \u8d44\u6e90<\/h3>\n

      \u6821\u9a8c\u901a\u8fc7\u540e，parser_bos \u5b8c\u6210\u4e24\u9879\u6536\u5c3e\u5de5\u4f5c：<\/p>\n

        \n
      • user-fence BO \u7684 GART \u6620\u5c04：\u82e5\u5b58\u5728 uf_bo，\u8c03\u7528 amdgpu_ttm_alloc_gart \u4e3a\u5176\u5efa\u7acb GART \u6620\u5c04，\u5e76\u5c06\u5176 GPU \u504f\u79fb\u7d2f\u52a0\u5230 gang_leader->uf_addr，\u4f7f GPU \u5b8c\u6210\u65f6\u80fd\u5c06\u4fe1\u53f7\u5199\u5165\u8be5\u5730\u5740\u3002<\/li>\n
      • GDS \/ GWS \/ OA \u5168\u5c40\u8d44\u6e90：\u901a\u8fc7 amdgpu_job_set_resources \u628a bo_list \u4e2d\u7684 GDS（Global Data Share）\u3001GWS（Global Wave Sync）\u3001OA（Ordered Append）\u5bf9\u8c61\u7ed1\u5b9a\u5230\u5404 job\u3002<\/li>\n<\/ul>\n

        \u968f\u540e parser_bos \u8fd4\u56de，\u63a7\u5236\u6743\u4ea4\u56de amdgpu_cs_ioctl \u4e3b\u6d41\u7a0b，\u8fdb\u5165\u7b2c \u2464 \u9636\u6bb5 patch_jobs\u3002<\/p>\n

        \u9519\u8bef\u56de\u9000：\u4e0a\u8ff0\u4efb\u4e00\u6b65\u9aa4\u5931\u8d25\u5747\u8df3\u8f6c\u81f3 out_free_user_pages\u2014\u2014\u91ca\u653e\u5404 userptr \u7684 HMM range\u3001\u89e3\u9501 bo_list_mutex \u540e\u8fd4\u56de；\u800c drm_exec \u5df2\u6301\u6709\u7684 BO \u9501\u5219\u7531\u5176\u6846\u67b6\u5728\u4e0a\u5c42\u7edf\u4e00 backoff，\u4e0e 8.1 \u6240\u8ff0\u6574\u4f53\u56de\u6eda\u4e00\u81f4，\u786e\u4fdd\u4e0d\u6b8b\u7559\u534a\u9501\u5b9a\u72b6\u6001\u3002<\/p>\n

        6. \u5c0f\u7ed3<\/h3>\n
          \n
        • amdgpu_cs_parser_bos \u662f\u547d\u4ee4\u63d0\u4ea4\u4e2d"\u9501\u5b9a + \u9a8c\u8bc1"\u7684\u6838\u5fc3\u9636\u6bb5，\u540c\u65f6\u4fdd\u8bc1 BO \u88ab\u7a33\u5b9a\u9501\u5b9a\u4e14\u5904\u4e8e\u5408\u6cd5\u5185\u5b58\u57df；<\/li>\n
        • drm_exec \u65e0\u6b7b\u9501\u5730\u4e00\u6b21\u6027\u9501\u5b9a\u5168\u90e8 dma_resv，\u5e76\u4e3a\u540e\u7eed\u56de\u5199 fence \u9884\u7559 slot；<\/li>\n
        • userptr \u578b BO \u5728\u52a0\u9501\u4e4b\u524d\u7ecf HMM range \u6293\u53d6\u9875\u9762\u5e76\u6807\u8bb0\u5931\u6548，\u52a0\u9501\u540e\u518d\u505a\u5f52\u5c5e\u6821\u9a8c\u4e0e\u9875\u9762\u56de\u586b；<\/li>\n
        • ttm_bo_validate（\u7ecf amdgpu_cs_bo_validate \u5c01\u88c5）\u5728 move \u8282\u6d41\u4e0e\u57df\u964d\u7ea7\u7b56\u7565\u4e0b\u5c06 BO \u56de\u8fc1\u81f3 VRAM \u6216 GTT；<\/li>\n
        • \u4e09\u79cd\u673a\u5236\u4ee5 dma_resv \u4e3a\u4ea4\u6c47\u70b9\u534f\u540c，\u4f7f"\u9501\u5b9a\u2014\u9a8c\u8bc1\u2014\u56de\u5199"\u5728\u540c\u4e00\u9501\u8bed\u4e49\u4e0b\u524d\u540e\u8fde\u8d2f\u3002<\/li>\n<\/ul>\n

          \u4e0b\u4e00\u8282 8.4 \u5c06\u8fdb\u5165\u4f9d\u8d56\u4e0e\u540c\u6b65\u70b9，\u9610\u8ff0\u547d\u4ee4\u63d0\u4ea4\u5982\u4f55\u6536\u96c6 in-fence（\u663e\u5f0f\u4f9d\u8d56 syncobj \/ \u9690\u5f0f\u4f9d\u8d56 dma_resv）\u5e76\u751f\u6210 out-fence，\u5bf9\u5e94\u7b2c \u2462 \u2466 \u9636\u6bb5\u7684\u4f9d\u8d56 chunk \u89e3\u6790\u4e0e amdgpu_cs_sync_rings\u3002\u81f3\u4e8e\u7b2c \u2465 \u9636\u6bb5 amdgpu_cs_vm_handling \u6d89\u53ca\u7684 GPUVM \u9875\u8868\u66f4\u65b0，\u5c5e\u4e8e GPU \u5730\u5740\u7a7a\u95f4\u7ba1\u7406\u8303\u7574，\u7559\u5f85\u7b2c\u4e5d\u7ae0 GPUVM \u4e13\u95e8\u5c55\u5f00\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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          \n\u4e00\u6b21\u547d\u4ee4\u63d0\u4ea4\u8981<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[11769,11768,11770],"topic":[],"class_list":["post-103295","post","type-post","status-publish","format-standard","hentry","category-server","tag-dma_resv","tag-drm_exec","tag-ttm_bo_validate"],"yoast_head":"\n8.3 BO \u6821\u9a8c\u4e0e\u9884\u7559\uff1adrm_exec\u3001ttm_bo_validate \u4e0e dma_resv \u7684\u534f\u540c - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/103295.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"8.3 BO \u6821\u9a8c\u4e0e\u9884\u7559\uff1adrm_exec\u3001ttm_bo_validate \u4e0e dma_resv \u7684\u534f\u540c - 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