{"id":103893,"date":"2026-09-11T14:25:36","date_gmt":"2026-09-11T06:25:36","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/103893.html"},"modified":"2026-09-11T14:25:36","modified_gmt":"2026-09-11T06:25:36","slug":"7-19-%e5%90%8c%e4%b8%80%e4%b8%aa-gtt-bo-%e7%9a%84%e4%b8%a4%e6%9d%a1%e8%ae%bf%e9%97%ae%e8%b7%af%e5%be%84%ef%bc%9a%e7%94%a8%e6%88%b7%e6%80%81%e4%b8%8e%e5%86%85%e6%a0%b8%e7%9a%84%e6%98%a0%e5%b0%84","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/103893.html","title":{"rendered":"7.19 \u540c\u4e00\u4e2a GTT BO \u7684\u4e24\u6761\u8bbf\u95ee\u8def\u5f84\uff1a\u7528\u6237\u6001\u4e0e\u5185\u6838\u7684\u6620\u5c04\u5dee\u5f02"},"content":{"rendered":"<p>7-18\u300aGART \u4e0e GPUVM \u5bf9\u6bd4&#xff1a;\u4e00\u9897 GPU \u4e0a\u4e24\u5957\u9875\u8868\u7684\u5206\u5de5\u300b \u4ece\u516d\u4e2a\u7ef4\u5ea6\u6a2a\u5411\u5bf9\u6bd4\u4e86\u4e24\u5957\u9875\u8868&#xff0c;\u8bf4\u660e\u5b83\u4eec\u6309 VMID \u5206\u5de5\u3001\u5e76\u5b58\u4e8e\u540c\u4e00\u9897 GMC\u3002\u5bf9\u6bd4\u4e4b\u540e\u6700\u5bb9\u6613\u5192\u51fa\u7684\u4e00\u4e2a\u5b9e\u9645\u95ee\u9898\u662f&#xff1a;\u4e00\u4e2a\u7528\u6237\u6001\u7533\u8bf7\u7684 GTT \u57df BO&#xff0c;\u4ea4\u7ed9 GPU \u8bbf\u95ee\u65f6\u5230\u5e95\u8d70\u54ea\u5957\u9875\u8868&#xff1f;&#034;GTT&#034;\u8fd9\u4e2a\u540d\u5b57\u91cc\u5e26\u7740 aperture \u7684\u542b\u4e49&#xff0c;\u5f88\u5bb9\u6613\u8ba9\u4eba\u4ee5\u4e3a\u5b83\u5fc5\u7136\u7ecf\u8fc7 GART\u3002<\/p>\n<p>\u672c\u7bc7\u9501\u5b9a\u540c\u4e00\u4e2a GTT BO&#xff0c;\u8ffd\u8e2a\u5b83\u88ab\u4e24\u7c7b\u8bbf\u95ee\u8005\u4f7f\u7528\u65f6\u7684\u5730\u5740\u8f6c\u6362\u8def\u5f84&#xff0c;\u5f97\u51fa\u4e00\u4e2a\u53cd\u76f4\u89c9\u4f46\u6709\u6e90\u7801\u4f9d\u636e\u7684\u7ed3\u8bba&#xff1a;\u7528\u6237\u8fdb\u7a0b\u8bbf\u95ee GTT BO \u8d70\u7684\u662f\u6bcf\u8fdb\u7a0b GPUVM&#xff0c;\u53f6\u5b50 PTE \u76f4\u63a5\u7f16\u7801\u7cfb\u7edf\u5185\u5b58\u7684 DMA \u5730\u5740&#xff0c;\u5e76\u4e0d\u7ecf\u8fc7 GART&#xff1b;GART \u6620\u5c04\u670d\u52a1\u7684\u662f\u5185\u6838\u81ea\u8eab\u5bf9\u8be5 BO \u7684\u8bbf\u95ee\u3002\u540c\u4e00\u4efd\u7269\u7406\u9875\u56e0\u6b64\u540c\u65f6\u6302\u5728\u4e24\u5957\u9875\u8868\u4e0b&#xff0c;\u6309\u8bbf\u95ee\u8005\u5206\u6d41\u3002<\/p>\n<hr \/>\n<h3>\u76ee\u5f55<\/h3>\n<ul>\n<li>1 \u6982\u8ff0&#xff1a;\u4e00\u4e2a BO&#xff0c;\u4e24\u4e2a\u8bbf\u95ee\u8005<\/li>\n<li>2 \u7528\u6237\u6001\u8def\u5f84&#xff1a;\u4ece GEM_VA \u5230 pages_addr<\/li>\n<li>3 \u5173\u952e\u4e00\u6b65&#xff1a;GPUVM \u53f6\u5b50 PTE \u76f4\u586b DMA \u5730\u5740<\/li>\n<li>4 \u5185\u6838\u8def\u5f84&#xff1a;\u540c\u4e00 BO \u7ed1\u8fdb GART<\/li>\n<li>5 \u8c01\u5728\u4f7f\u7528 GART \u5730\u5740<\/li>\n<li>6 \u4e24\u5957\u6620\u5c04\u5e76\u5b58\u4e0e\u4e00\u81f4\u6027<\/li>\n<li>7 \u5c0f\u7ed3<\/li>\n<\/ul>\n<hr \/>\n<h3>1 \u6982\u8ff0&#xff1a;\u4e00\u4e2a BO&#xff0c;\u4e24\u4e2a\u8bbf\u95ee\u8005<\/h3>\n<p>\u8003\u8651\u4e00\u4e2a\u5178\u578b\u573a\u666f&#xff1a;\u7528\u6237\u6001\u901a\u8fc7 DRM_IOCTL_AMDGPU_GEM_CREATE \u7533\u8bf7\u4e00\u5757 GTT \u57df BO&#xff0c;\u5176\u7269\u7406\u9875\u7531\u5185\u6838\u4ece\u7cfb\u7edf\u5185\u5b58\u6309\u9875\u5206\u914d&#xff0c;\u7269\u7406\u4e0a\u901a\u5e38\u79bb\u6563\u3002\u8fd9\u5757 BO \u4f1a\u88ab\u4e24\u7c7b\u4e3b\u4f53\u8bbf\u95ee&#xff0c;\u4e8c\u8005\u7528\u7684\u662f\u5b8c\u5168\u4e0d\u540c\u7684\u5730\u5740\u8f6c\u6362\u673a\u5236\u3002<\/p>\n<p>\u7b2c\u4e00\u7c7b\u662f\u7528\u6237\u8fdb\u7a0b\u81ea\u5df1\u63d0\u4ea4\u7684 GPU \u547d\u4ee4\u3002\u5b83\u8fd0\u884c\u5728\u8be5\u8fdb\u7a0b\u7684 GPUVM \u4e0a\u4e0b\u6587&#xff08;VMID 1\u201315&#xff09;&#xff0c;\u4f7f\u7528\u8fdb\u7a0b\u79c1\u6709\u7684 48 \u4f4d\u865a\u62df\u5730\u5740&#xff0c;\u7ecf\u56db\u7ea7\u9875\u8868\u7ffb\u8bd1\u3002\u7b2c\u4e8c\u7c7b\u662f\u5185\u6838\u9a71\u52a8\u81ea\u8eab&#xff0c;\u4f8b\u5982\u7528 SDMA \u642c\u8fd0\u8fd9\u5757 BO \u7684\u5185\u5bb9\u3001\u6216\u5728\u521d\u59cb\u5316\u8def\u5f84\u4e2d\u8bfb\u5199\u5b83\u3002\u5185\u6838\u8d70\u7684\u662f VMID 0 \u7684 GART \u4e0a\u4e0b\u6587\u3002<\/p>\n<p>VMID \u7684\u5206\u5de5\u5728 7-18 \u5df2\u501f gmc_v9_0.c \u7684\u6ce8\u91ca\u8bf4\u660e&#xff1a;VMID 0 \u4fdd\u7559\u7ed9 System&#xff08;\u5185\u6838&#xff09;&#xff0c;VMID 1 \u53ca\u4ee5\u4e0a\u5206\u914d\u7ed9\u56fe\u5f62\/\u8ba1\u7b97\u4e0e KFD\u3002\u672c\u7bc7\u8981\u56de\u7b54\u7684\u662f&#xff1a;\u540c\u4e00\u4e2a GTT BO \u5728\u8fd9\u4e24\u4e2a\u4e0a\u4e0b\u6587\u91cc&#xff0c;PTE \u91cc\u586b\u7684\u7269\u7406\u5730\u5740\u5206\u522b\u662f\u4ec0\u4e48\u3001\u662f\u5426\u90fd\u7ecf\u8fc7 GART\u3002<\/p>\n<\/p>\n<h3>2 \u7528\u6237\u6001\u8def\u5f84&#xff1a;\u4ece GEM_VA \u5230 pages_addr<\/h3>\n<p>\u7528\u6237\u6001\u8981\u8ba9 GPU \u901a\u8fc7 GPUVM \u8bbf\u95ee BO&#xff0c;\u5148\u7ecf DRM_IOCTL_AMDGPU_GEM_VA \u628a BO \u6620\u5c04\u5230\u8fdb\u7a0b VM \u5730\u5740\u7a7a\u95f4&#xff0c;\u5efa\u7acb amdgpu_bo_va \u4e0e mapping&#xff08;\u8fd9\u4e00\u6b65\u7684\u63a5\u53e3\u8bed\u4e49\u89c1 7-5\u300aBO \u5230 VA \u7684\u6620\u5c04\u300b&#xff09;\u3002\u771f\u6b63\u628a\u7269\u7406\u5730\u5740\u5199\u8fdb\u9875\u8868&#xff0c;\u53d1\u751f\u5728 amdgpu_vm_bo_update() \u4e2d\u3002<\/p>\n<p>\u8be5\u51fd\u6570\u5728\u53d6\u5f97 BO \u5f53\u524d\u6240\u5728\u7684 TTM \u8d44\u6e90\u540e&#xff0c;\u5bf9 GTT&#xff08;TTM_PL_TT&#xff09;\u4e0e\u53ef\u62a2\u5360&#xff08;AMDGPU_PL_PREEMPT&#xff09;\u57df&#xff0c;\u76f4\u63a5\u53d6\u51fa BO \u5404\u9875\u7684 DMA \u5730\u5740\u6570\u7ec4&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/drivers\/gpu\/drm\/amd\/amdgpu\/amdgpu_vm.c<\/span><br \/>\nmem <span class=\"token operator\">&#061;<\/span> bo<span class=\"token operator\">-&gt;<\/span>tbo<span class=\"token punctuation\">.<\/span>resource<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>mem <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token punctuation\">(<\/span>mem<span class=\"token operator\">-&gt;<\/span>mem_type <span class=\"token operator\">&#061;&#061;<\/span> TTM_PL_TT <span class=\"token operator\">||<\/span><br \/>\n    mem<span class=\"token operator\">-&gt;<\/span>mem_type <span class=\"token operator\">&#061;&#061;<\/span> AMDGPU_PL_PREEMPT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\npages_addr <span class=\"token operator\">&#061;<\/span> bo<span class=\"token operator\">-&gt;<\/span>tbo<span class=\"token punctuation\">.<\/span>ttm<span class=\"token operator\">-&gt;<\/span>dma_address<span class=\"token punctuation\">;<\/span><\/p>\n<p>bo-&gt;tbo.ttm-&gt;dma_address \u662f TTM \u4e3a\u8be5 BO \u6bcf\u4e2a\u9875\u5efa\u7acb\u7684 DMA \u6620\u5c04\u5730\u5740\u6570\u7ec4\u2014\u2014\u5373\u8bbe\u5907\u53ef\u76f4\u63a5\u5bfb\u5740\u7684\u7cfb\u7edf\u5185\u5b58\u7269\u7406\u5730\u5740\u3002\u8fd9\u4e2a pages_addr \u968f\u540e\u88ab\u4f20\u5165 amdgpu_vm_map_range()&#xff0c;\u6210\u4e3a\u5199 PTE \u65f6\u7684\u5730\u5740\u6765\u6e90\u3002\u6ce8\u610f\u8fd9\u91cc\u6ca1\u6709\u4efb\u4f55\u4e00\u6b65\u628a\u5730\u5740\u6362\u7b97\u6210 GART aperture \u5185\u7684\u5730\u5740&#xff08;gart_start &#043; offset&#xff09;&#xff1b;\u7528\u6237\u6001\u8def\u5f84\u4ece\u4e00\u5f00\u59cb\u62ff\u5230\u7684\u5c31\u662f\u539f\u59cb DMA \u5730\u5740\u3002<\/p>\n<\/p>\n<h3>3 \u5173\u952e\u4e00\u6b65&#xff1a;GPUVM \u53f6\u5b50 PTE \u76f4\u586b DMA \u5730\u5740<\/h3>\n<p>pages_addr \u6700\u7ec8\u5982\u4f55\u53d8\u6210\u53f6\u5b50 PTE \u91cc\u7684\u7269\u7406\u5730\u5740&#xff1f;\u7b54\u6848\u5728 amdgpu_vm_map_gart()&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/drivers\/gpu\/drm\/amd\/amdgpu\/amdgpu_vm.c<\/span><br \/>\n<span class=\"token class-name\">uint64_t<\/span> <span class=\"token function\">amdgpu_vm_map_gart<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token class-name\">dma_addr_t<\/span> <span class=\"token operator\">*<\/span>pages_addr<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">uint64_t<\/span> addr<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token class-name\">uint64_t<\/span> result<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* page table offset *\/<\/span><br \/>\nresult <span class=\"token operator\">&#061;<\/span> pages_addr<span class=\"token punctuation\">[<\/span>addr <span class=\"token operator\">&gt;&gt;<\/span> PAGE_SHIFT<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* in case cpu page size !&#061; gpu page size*\/<\/span><br \/>\nresult <span class=\"token operator\">|&#061;<\/span> addr <span class=\"token operator\">&amp;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">~<\/span>PAGE_MASK<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>result <span class=\"token operator\">&amp;&#061;<\/span> <span class=\"token number\">0xFFFFFFFFFFFFF000ULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u4e2a\u51fd\u6570\u540d\u5b57\u91cc\u5e26 gart&#xff0c;\u6781\u6613\u9020\u6210\u8bef\u89e3&#xff0c;\u4f46\u5b83\u505a\u7684\u4e8b\u4e0e GART aperture \u65e0\u5173&#xff1a;\u5b83\u4ee5 addr &gt;&gt; PAGE_SHIFT \u4e3a\u4e0b\u6807&#xff0c;\u4ece pages_addr \u6570\u7ec4\u91cc\u53d6\u51fa\u5bf9\u5e94\u9875\u7684 DMA \u5730\u5740&#xff0c;\u62fc\u4e0a\u9875\u5185\u504f\u79fb\u3001\u5bf9\u9f50\u5230\u9875\u8fb9\u754c\u540e\u8fd4\u56de\u3002\u8fd4\u56de\u7684\u662f\u7cfb\u7edf\u5185\u5b58\u7684 DMA \u7269\u7406\u5730\u5740&#xff0c;\u4e0d\u662f gart_start &#043; offset\u3002<\/p>\n<p>SDMA \u66f4\u65b0\u8def\u5f84\u4e2d&#xff0c;\u8fd9\u4e2a\u8fd4\u56de\u503c\u76f4\u63a5\u88ab\u7f16\u7801\u4e3a\u53f6\u5b50 PTE&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/drivers\/gpu\/drm\/amd\/amdgpu\/amdgpu_vm_sdma.c<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> nptes<span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>i<span class=\"token punctuation\">,<\/span> addr <span class=\"token operator\">&#043;&#061;<\/span> incr<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nu64 oflags <span class=\"token operator\">&#061;<\/span> flags<span class=\"token punctuation\">;<\/span><\/p>\n<p>pte<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">amdgpu_vm_map_gart<\/span><span class=\"token punctuation\">(<\/span>p<span class=\"token operator\">-&gt;<\/span>pages_addr<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>p<span class=\"token operator\">-&gt;<\/span>override_pte<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token function\">amdgpu_gmc_override_vm_pte_flags<\/span><span class=\"token punctuation\">(<\/span>p<span class=\"token operator\">-&gt;<\/span>adev<span class=\"token punctuation\">,<\/span> p<span class=\"token operator\">-&gt;<\/span>vm<span class=\"token punctuation\">,<\/span> pte<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>oflags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>pte<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">|&#061;<\/span> oflags<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>pte[i] \u7531 DMA \u5730\u5740\u4e0e\u6807\u5fd7\u4f4d\u6216\u5408\u800c\u6210\u3002\u4e5f\u5c31\u662f\u8bf4&#xff0c;\u7528\u6237\u8fdb\u7a0b\u901a\u8fc7 GPUVM \u8bbf\u95ee GTT BO \u65f6&#xff0c;GMC \u786c\u4ef6\u904d\u5386\u8fd9\u68f5\u56db\u7ea7\u9875\u8868&#xff0c;\u5728\u53f6\u5b50 PTE \u91cc\u8bfb\u5230\u7684\u662f BO \u9875\u7684 DMA \u5730\u5740&#xff0c;\u76f4\u63a5\u5bfb\u5740\u7cfb\u7edf\u5185\u5b58&#xff0c;\u4e2d\u95f4\u4e0d\u518d\u7ecf\u8fc7 GART \u8fd9\u4e00\u5c42\u3002GART \u7684\u5355\u5c42\u91cd\u6620\u5c04\u8868\u5728\u8fd9\u6761\u8def\u5f84\u4e0a\u5b8c\u5168\u4e0d\u53c2\u4e0e\u3002<\/p>\n<p>\u9700\u8981\u6f84\u6e05 amdgpu_vm_map_gart \u7684\u547d\u540d\u7531\u6765&#xff1a;\u5b83\u6e90\u81ea&#034;\u89e3\u6790\u4e00\u4e2a\u5730\u5740\u5728\u9875\u8868\u6620\u5c04\u4e0b\u5bf9\u5e94\u7684\u7269\u7406\u9875&#034;\u8fd9\u4e00\u542b\u4e49&#xff08;\u51fd\u6570\u6ce8\u91ca\u5199\u7684\u662f \u201cResolve gart mapping of addr\u201d&#xff09;&#xff0c;\u662f\u5386\u53f2\u6cbf\u7528\u7684\u540d\u5b57&#xff0c;\u4e0e VMID 0 \u7684\u90a3\u5957 GART \u9875\u8868\u4e0d\u662f\u540c\u4e00\u4e2a\u6982\u5ff5\u3002\u8bfb\u4ee3\u7801\u65f6\u82e5\u628a\u5b83\u5f53\u6210&#034;\u8d70 GART&#034;&#xff0c;\u5c31\u4f1a\u5f97\u51fa\u9519\u8bef\u7ed3\u8bba\u3002<\/p>\n<\/p>\n<h3>4 \u5185\u6838\u8def\u5f84&#xff1a;\u540c\u4e00 BO \u7ed1\u8fdb GART<\/h3>\n<p>\u7528\u6237\u6001\u8def\u5f84\u4e0d\u7ecf GART&#xff0c;\u4e0d\u4ee3\u8868\u8fd9\u4e2a GTT BO \u4e0e GART \u65e0\u5173\u3002\u4e8b\u5b9e\u4e0a&#xff0c;\u5f53 BO \u88ab\u653e\u7f6e\u5230 GTT \u57df\u65f6&#xff0c;TTM \u7684\u7ed1\u5b9a\u56de\u8c03 amdgpu_ttm_backend_bind() \u4f1a\u628a\u5b83\u7684\u7269\u7406\u9875\u5199\u8fdb GART \u9875\u8868&#xff08;\u8fd9\u6761\u94fe\u8def\u89c1 6-2\u300aGPU GART \u7ed1\u5b9a\u673a\u5236\u4e0e TLB \u5931\u6548\u300b&#xff09;\u3002\u7ed1\u5b9a\u4e4b\u540e&#xff0c;\u8fd9\u5757 BO \u5728 GART aperture \u4e2d\u5c31\u6709\u4e86\u4e00\u6bb5\u8fde\u7eed\u5730\u5740&#xff0c;\u5176\u8d77\u70b9\u7531 amdgpu_ttm_domain_start() \u7ed9\u51fa&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/drivers\/gpu\/drm\/amd\/amdgpu\/amdgpu_ttm.c<\/span><br \/>\n<span class=\"token class-name\">uint64_t<\/span> <span class=\"token function\">amdgpu_ttm_domain_start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">amdgpu_device<\/span> <span class=\"token operator\">*<\/span>adev<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">uint32_t<\/span> type<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>type<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">case<\/span> TTM_PL_TT<span class=\"token operator\">:<\/span><br \/>\n<span class=\"token keyword\">return<\/span> adev<span class=\"token operator\">-&gt;<\/span>gmc<span class=\"token punctuation\">.<\/span>gart_start<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">case<\/span> TTM_PL_VRAM<span class=\"token operator\">:<\/span><br \/>\n<span class=\"token keyword\">return<\/span> adev<span class=\"token operator\">-&gt;<\/span>gmc<span class=\"token punctuation\">.<\/span>vram_start<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5bf9 TTM_PL_TT \u57df&#xff0c;GPU \u8d77\u59cb\u5730\u5740\u6b63\u662f gmc.gart_start\u3002BO \u5728 GART \u5185\u7684\u5730\u5740\u5373 gart_start &#043; \u8d44\u6e90\u8d77\u59cb\u504f\u79fb\u3002\u8fd9\u6bb5\u5730\u5740\u5c5e\u4e8e VMID 0 \u4e0a\u4e0b\u6587&#xff0c;\u4f9b\u5185\u6838\u4f7f\u7528&#xff0c;\u4e0e\u7528\u6237\u8fdb\u7a0b\u7684 GPUVM \u5730\u5740\u7a7a\u95f4\u5f7c\u6b64\u72ec\u7acb\u3002<\/p>\n<\/p>\n<h3>5 \u8c01\u5728\u4f7f\u7528 GART \u5730\u5740<\/h3>\n<p>\u5185\u6838\u5728\u54ea\u4e9b\u573a\u666f\u7528\u8fd9\u6bb5 GART \u5730\u5740&#xff1f;\u6700\u5178\u578b\u7684\u662f\u901a\u8fc7 SDMA \u5f15\u64ce\u642c\u8fd0 BO \u5185\u5bb9\u3002amdgpu_ttm_map_buffer() \u7684\u6ce8\u91ca\u76f4\u63a5\u70b9\u660e\u5b83\u5728&#034;\u8bbe\u7f6e GART \u7a97\u53e3\u4ee5\u8bbf\u95ee\u4e00\u6bb5\u5185\u5b58&#xff0c;\u6216\u5bf9\u672c\u5730\u5185\u5b58\u8fd4\u56de\u7269\u7406\u5730\u5740&#034;&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/drivers\/gpu\/drm\/amd\/amdgpu\/amdgpu_ttm.c<\/span><br \/>\n<span class=\"token comment\">\/* Map only what can&#039;t be accessed directly *\/<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>tmz <span class=\"token operator\">&amp;&amp;<\/span> mem<span class=\"token operator\">-&gt;<\/span>start <span class=\"token operator\">!&#061;<\/span> AMDGPU_BO_INVALID_OFFSET<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token operator\">*<\/span>addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">amdgpu_ttm_domain_start<\/span><span class=\"token punctuation\">(<\/span>adev<span class=\"token punctuation\">,<\/span> mem<span class=\"token operator\">-&gt;<\/span>mem_type<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\nmm_cur<span class=\"token operator\">-&gt;<\/span>start<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5bf9\u53ef\u76f4\u63a5\u8bbf\u95ee\u7684\u5185\u5b58&#xff08;\u975e\u52a0\u5bc6\u3001\u8d44\u6e90\u8d77\u59cb\u504f\u79fb\u6709\u6548&#xff09;&#xff0c;\u5b83\u76f4\u63a5\u8fd4\u56de amdgpu_ttm_domain_start() &#043; mm_cur-&gt;start&#xff0c;\u5373 GTT \u57df\u7684 GART \u5730\u5740&#xff1b;\u53ea\u6709\u65e0\u6cd5\u76f4\u63a5\u5bfb\u5740\u7684\u60c5\u5f62\u624d\u53e6\u8bbe GART window\u3002\u5185\u6838 SDMA \u62f7\u8d1d\u968f\u540e\u5c31\u4ee5\u8fd9\u4e2a GART \u5730\u5740\u4f5c\u4e3a\u6e90\/\u76ee\u7684\u5730\u5740\u53d1\u51fa\u547d\u4ee4\u3002<\/p>\n<p>\u53e6\u4e00\u5904\u662f\u5185\u6838\u7ecf SDMA \u76f4\u63a5\u8bfb\u5199 BO \u7684\u8c03\u8bd5\/\u8bbf\u95ee\u8def\u5f84&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/drivers\/gpu\/drm\/amd\/amdgpu\/amdgpu_ttm.c<\/span><br \/>\nsrc_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">amdgpu_ttm_domain_start<\/span><span class=\"token punctuation\">(<\/span>adev<span class=\"token punctuation\">,<\/span> bo<span class=\"token operator\">-&gt;<\/span>resource<span class=\"token operator\">-&gt;<\/span>mem_type<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\nsrc_mm<span class=\"token punctuation\">.<\/span>start<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u540c\u6837\u4ee5 domain_start&#xff08;TT \u57df\u5373 gart_start&#xff09;\u4e3a\u57fa\u5740\u3002\u8fd9\u4e9b\u90fd\u662f VMID 0 \u8def\u5f84&#xff1a;\u5185\u6838\u4e0d\u6301\u6709\u7528\u6237\u8fdb\u7a0b\u7684 GPUVM \u4e0a\u4e0b\u6587&#xff0c;\u53ea\u80fd\u901a\u8fc7\u5168\u5c40 GART aperture \u8bbf\u95ee BO\u3002<\/p>\n<\/p>\n<h3>6 \u4e24\u5957\u6620\u5c04\u5e76\u5b58\u4e0e\u4e00\u81f4\u6027<\/h3>\n<p>\u7efc\u5408\u524d\u9762\u51e0\u8282&#xff0c;\u4e00\u4e2a\u7528\u6237\u6001 GTT BO \u5728\u88ab\u7ed1\u5b9a\u4e0e\u6620\u5c04\u540e&#xff0c;\u540c\u65f6\u6302\u5728\u4e24\u5957\u9875\u8868\u4e0b&#xff1a;<\/p>\n<table>\n<tr>\u8bbf\u95ee\u8005\u4e0a\u4e0b\u6587\u9875\u8868\u53f6\u5b50\u8868\u9879\u91cc\u7684\u7269\u7406\u5730\u5740<\/tr>\n<tbody>\n<tr>\n<td>\u7528\u6237\u8fdb\u7a0b\u547d\u4ee4<\/td>\n<td>VMID 1\u201315<\/td>\n<td>GPUVM \u56db\u7ea7\u9875\u8868<\/td>\n<td>BO \u9875\u7684 DMA \u5730\u5740&#xff08;\u7ecf amdgpu_vm_map_gart \u53d6\u81ea pages_addr&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u5185\u6838\u9a71\u52a8<\/td>\n<td>VMID 0<\/td>\n<td>GART \u5355\u5c42\u8868<\/td>\n<td>\u901a\u8fc7 gart_start &#043; offset \u518d\u7531 GART \u8f6c\u6362\u5230 DMA \u5730\u5740<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4e24\u5957\u6620\u5c04\u6307\u5411\u7684\u662f\u540c\u4e00\u4efd\u7cfb\u7edf\u5185\u5b58\u7269\u7406\u9875&#xff0c;\u4f46\u5165\u53e3\u5730\u5740\u3001\u9875\u8868\u7ed3\u6784\u3001\u6240\u5c5e VMID \u5404\u4e0d\u76f8\u540c\u3002\u5b83\u4eec\u7684\u7ef4\u62a4\u4e5f\u76f8\u4e92\u72ec\u7acb&#xff1a;GPUVM \u4fa7\u7684\u5931\u6548\u8d70 per-VMID \u7684 tlb_seq \u4e0e vm_flush&#xff08;\u89c1 7-12\u300aTLB \u7ba1\u7406\u4e0e\u5237\u65b0\u300b&#xff09;&#xff0c;GART \u4fa7\u7684\u5931\u6548\u8d70\u5168\u5c40 amdgpu_gart_invalidate_tlb()&#xff08;\u89c1 6-2&#xff09;\u3002<\/p>\n<p>\u7531\u6b64\u53ef\u4ee5\u5398\u6e05&#034;GTT \u5c31\u8d70 GART&#034;\u8fd9\u4e00\u76f4\u89c9\u7684\u95ee\u9898\u6240\u5728&#xff1a;GTT \u63cf\u8ff0\u7684\u662f BO \u7684\u5185\u5b58\u653e\u7f6e\u57df&#xff08;\u7cfb\u7edf\u5185\u5b58 &#043; TTM \u7ba1\u7406&#xff09;&#xff0c;\u800c\u8bbf\u95ee\u8def\u5f84\u7531\u8bbf\u95ee\u8005\u7684 VMID \u4e0a\u4e0b\u6587\u51b3\u5b9a&#xff0c;\u4e0e\u5185\u5b58\u57df\u5e76\u975e\u4e00\u4e00\u5bf9\u5e94\u3002\u540c\u4e00\u4efd GTT \u7269\u7406\u9875&#xff0c;\u7528\u6237\u8fdb\u7a0b\u7ecf GPUVM \u76f4\u8fbe&#xff0c;\u5185\u6838\u7ecf GART \u4e2d\u8f6c\u3002GART \u5728\u73b0\u4ee3 GFX9 \u53ca\u4ee5\u540e\u4e3b\u8981\u670d\u52a1\u5185\u6838 VMID 0 \u8def\u5f84&#xff0c;\u7528\u6237\u6001\u6570\u636e\u8bbf\u95ee\u7684\u4e3b\u529b\u662f GPUVM\u3002<\/p>\n<\/p>\n<h3>7 \u5c0f\u7ed3<\/h3>\n<p>\u672c\u7bc7\u4ee5\u4e00\u4e2a\u7528\u6237\u6001 GTT BO \u4e3a\u5bf9\u8c61&#xff0c;\u8ffd\u8e2a\u4e86\u5b83\u7684\u4e24\u6761 GPU \u8bbf\u95ee\u8def\u5f84&#xff1a;<\/p>\n<ul>\n<li>\u7528\u6237\u8fdb\u7a0b\u8bbf\u95ee\u8d70 GPUVM&#xff1a;GEM_VA \u5efa\u7acb\u6620\u5c04\u540e&#xff0c;amdgpu_vm_bo_update() \u5bf9 TT \u57df\u53d6 pages_addr &#061; bo-&gt;tbo.ttm-&gt;dma_address&#xff0c;\u7ecf amdgpu_vm_map_gart() \u628a DMA \u5730\u5740\u586b\u8fdb\u53f6\u5b50 PTE&#xff0c;GMC \u76f4\u63a5\u5bfb\u5740\u7cfb\u7edf\u5185\u5b58&#xff0c;\u4e0d\u7ecf GART\u3002<\/li>\n<li>amdgpu_vm_map_gart() \u540d\u5b57\u5e26 gart&#xff0c;\u5b9e\u9645\u53ea\u662f\u4ece pages_addr \u6570\u7ec4\u6309\u9875\u53d6 DMA \u5730\u5740&#xff0c;\u4e0e VMID 0 \u7684 GART \u9875\u8868\u65e0\u5173&#xff0c;\u662f\u5e38\u89c1\u7684\u8bef\u8bfb\u70b9\u3002<\/li>\n<li>\u5185\u6838\u8bbf\u95ee\u8d70 GART&#xff1a;\u540c\u4e00 BO \u88ab amdgpu_ttm_backend_bind() \u7ed1\u8fdb GART \u8868&#xff0c;amdgpu_ttm_domain_start(TT) \u8fd4\u56de gart_start&#xff1b;SDMA \u642c\u8fd0&#xff08;amdgpu_ttm_map_buffer&#xff09;\u4e0e\u5185\u6838\u76f4\u63a5\u8bbf\u95ee\u4ee5\u8be5 GART \u5730\u5740\u4e3a\u57fa\u5740\u3002<\/li>\n<li>\u540c\u4e00\u4efd\u7269\u7406\u9875\u5e76\u5b58\u4e24\u5957\u6620\u5c04&#xff0c;\u6309\u8bbf\u95ee\u8005\u7684 VMID \u5206\u6d41&#xff0c;\u5931\u6548\u673a\u5236\u5404\u81ea\u72ec\u7acb\u3002&#034;GTT \u8d70 GART&#034;\u7684\u76f4\u89c9\u4e0d\u6210\u7acb\u2014\u2014\u5185\u5b58\u653e\u7f6e\u57df\u4e0e\u8bbf\u95ee\u8def\u5f84\u7531\u4e0d\u540c\u56e0\u7d20\u51b3\u5b9a\u3002<\/li>\n<\/ul>\n<p>\u81f3\u6b64&#xff0c;GART \u4e0e GPUVM \u7684\u5173\u7cfb\u5df2\u4ece\u9759\u6001\u5bf9\u6bd4&#xff08;7-18&#xff09;\u5ef6\u4f38\u5230\u540c\u4e00\u5bf9\u8c61\u4e0a\u7684\u52a8\u6001\u5206\u6d41\u3002\u4e0b\u4e00\u7ae0\u8f6c\u5411\u5730\u5740\u8f6c\u6362\u7684\u7b2c\u4e09\u5c42&#xff1a;DMA \u5730\u5740\u7a7a\u95f4\u4e0e IOMMU&#xff0c;\u5206\u6790 dma_address \u672c\u8eab\u662f\u5982\u4f55\u5728\u7cfb\u7edf\u4fa7\u5efa\u7acb\u7684\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>7-18\u300aGART \u4e0e GPUVM \u5bf9\u6bd4&#xff1a;\u4e00\u9897 GPU \u4e0a\u4e24\u5957\u9875\u8868\u7684\u5206\u5de5\u300b \u4ece\u516d\u4e2a\u7ef4\u5ea6\u6a2a\u5411\u5bf9\u6bd4\u4e86\u4e24\u5957\u9875\u8868&#xff0c;\u8bf4\u660e\u5b83\u4eec\u6309 VMID \u5206\u5de5\u3001\u5e76\u5b58\u4e8e\u540c\u4e00\u9897 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