{"id":72590,"date":"2026-02-06T07:56:51","date_gmt":"2026-02-05T23:56:51","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/72590.html"},"modified":"2026-02-06T07:56:51","modified_gmt":"2026-02-05T23:56:51","slug":"05-%e8%bf%9b%e7%a8%8b%e4%b8%8esvm%e7%9a%84%e5%85%b3%e7%b3%bb","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/72590.html","title":{"rendered":"05 - \u8fdb\u7a0b\u4e0eSVM\u7684\u5173\u7cfb"},"content":{"rendered":"<p>\u96be\u5ea6: &#x1f7e1; \u8fdb\u9636 \u9884\u8ba1\u5b66\u4e60\u65f6\u95f4: 1-1.5\u5c0f\u65f6 \u524d\u7f6e\u77e5\u8bc6: \u524d\u9762\u7ae0\u8282\u5185\u5bb9\u3001Linux\u8fdb\u7a0b\u7ba1\u7406\u57fa\u7840<\/p>\n<hr \/>\n<h3>&#x1f4cb; \u6982\u8ff0<\/h3>\n<p>\u5728AMDGPU\u9a71\u52a8\u4e2d&#xff0c;\u6bcf\u4e2a\u4f7f\u7528GPU\u8ba1\u7b97\u7684\u8fdb\u7a0b\u90fd\u6709\u4e00\u4e2akfd_process\u7ed3\u6784\u3002SVM\u529f\u80fd\u662f\u4ee5\u8fdb\u7a0b\u4e3a\u5355\u4f4d\u7ec4\u7ec7\u7684\u2014\u2014\u6bcf\u4e2a\u8fdb\u7a0b\u90fd\u6709\u72ec\u7acb\u7684SVM\u8303\u56f4\u5217\u8868\u3002\u672c\u7ae0\u5c06\u6df1\u5165\u63a2\u8ba8\u8fdb\u7a0b\u5982\u4f55\u7ba1\u7406SVM&#xff0c;\u4ee5\u53ca\u5728\u8fdb\u7a0b\u751f\u547d\u5468\u671f\u7684\u5404\u4e2a\u9636\u6bb5SVM\u5982\u4f55\u521d\u59cb\u5316\u3001\u4f7f\u7528\u548c\u6e05\u7406\u3002<\/p>\n<p>\u60f3\u8c61\u4e00\u4e0b\u8fdb\u7a0b\u5c31\u50cf\u4e00\u4e2a\u56fe\u4e66\u9986&#xff1a;<\/p>\n<ul>\n<li>&#x1f4d6; kfd_process \u662f\u56fe\u4e66\u9986\u672c\u8eab<\/li>\n<li>&#x1f4da; svm_range_list \u662f\u56fe\u4e66\u7ba1\u7406\u7cfb\u7edf<\/li>\n<li>&#x1f4d8; \u6bcf\u4e2a svm_range \u662f\u4e00\u672c\u4e66<\/li>\n<li>&#x1f511; \u8fdb\u7a0b\u62e5\u6709\u6240\u6709\u4e66\u7c4d\u7684\u7ba1\u7406\u6743<\/li>\n<\/ul>\n<hr \/>\n<h3>5.1 kfd_process \u4e2d\u7684 SVM \u7ba1\u7406<\/h3>\n<h4>kfd_process \u7ed3\u6784\u4f53<\/h4>\n<p><span class=\"token comment\">\/\/ \u6587\u4ef6: kfd_priv.h<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kfd_process<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ &#061;&#061;&#061; \u8fdb\u7a0b\u8eab\u4efd &#061;&#061;&#061;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">hlist_node<\/span> kfd_processes<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u5168\u5c40\u8fdb\u7a0b\u54c8\u5e0c\u8868\u8282\u70b9<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>mm<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ mm_struct\u6307\u9488&#xff08;\u4e0d\u6301\u6709\u5f15\u7528&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">task_struct<\/span> <span class=\"token operator\">*<\/span>lead_thread<span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u4e3b\u7ebf\u7a0b<\/span><br \/>\n    <span class=\"token class-name\">uint32_t<\/span>  pasid<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ Process Address Space ID<\/span><br \/>\n    u16 context_id<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4e0a\u4e0b\u6587ID<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ &#061;&#061;&#061; \u5f15\u7528\u8ba1\u6570 &#061;&#061;&#061;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kref<\/span>  ref<span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ \u5f15\u7528\u8ba1\u6570<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">work_struct<\/span> release_work<span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u91ca\u653e\u5de5\u4f5c<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ &#061;&#061;&#061; \u540c\u6b65\u4fdd\u62a4 &#061;&#061;&#061;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mutex<\/span>   mutex<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u8fdb\u7a0b\u4e92\u65a5\u9501<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ &#061;&#061;&#061; GPU\u8bbe\u5907 &#061;&#061;&#061;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kfd_process_device<\/span> <span class=\"token operator\">*<\/span>pdds<span class=\"token punctuation\">[<\/span>MAX_GPU_INSTANCE<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6bcfGPU\u7684\u8bbe\u5907\u6570\u636e<\/span><br \/>\n    <span class=\"token class-name\">uint32_t<\/span> n_pdds<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8bbe\u5907\u6570\u91cf<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ &#061;&#061;&#061; \u961f\u5217\u7ba1\u7406 &#061;&#061;&#061;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">process_queue_manager<\/span> pqm<span class=\"token punctuation\">;<\/span>           <span class=\"token comment\">\/\/ \u961f\u5217\u7ba1\u7406\u5668<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ &#061;&#061;&#061; SVM\u7ba1\u7406 \u2605 \u91cd\u70b9 &#061;&#061;&#061;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">svm_range_list<\/span>   svms<span class=\"token punctuation\">;<\/span>               <span class=\"token comment\">\/\/ SVM\u8303\u56f4\u5217\u8868<\/span><br \/>\n    bool xnack_enabled<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ XNACK\u662f\u5426\u542f\u7528<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ &#061;&#061;&#061; MMU\u901a\u77e5 &#061;&#061;&#061;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mmu_notifier<\/span> mmu_notifier<span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ MMU\u901a\u77e5\u5668<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ &#061;&#061;&#061; \u4e8b\u4ef6\u7ba1\u7406 &#061;&#061;&#061;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mutex<\/span> event_mutex<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">idr<\/span> event_idr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kfd_signal_page<\/span>  <span class=\"token operator\">*<\/span>signal_page<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ &#061;&#061;&#061; \u5185\u5b58\u9a71\u9010 &#061;&#061;&#061;<\/span><br \/>\n    <span class=\"token keyword\">void<\/span>  <span class=\"token operator\">*<\/span>kgd_process_info<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ GPU\u9a71\u52a8\u4fe1\u606f<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">dma_fence<\/span> __rcu  <span class=\"token operator\">*<\/span>ef<span class=\"token punctuation\">;<\/span>                <span class=\"token comment\">\/\/ \u9a71\u9010fence<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">delayed_work<\/span> eviction_work<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">delayed_work<\/span> restore_work<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ &#061;&#061;&#061; \u8c03\u8bd5\u652f\u6301 &#061;&#061;&#061;<\/span><br \/>\n    bool debug_trap_enabled<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kfd_process<\/span> <span class=\"token operator\">*<\/span>debugger_process<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ &#061;&#061;&#061; \u5176\u4ed6 &#061;&#061;&#061;<\/span><br \/>\n    bool is_32bit_user_mode<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kobject<\/span>  <span class=\"token operator\">*<\/span>kobj<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ &#8230;\u66f4\u591a\u5b57\u6bb5<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>SVM\u5728\u8fdb\u7a0b\u4e2d\u7684\u4f4d\u7f6e<\/h4>\n<p>kfd_process (\u8fdb\u7a0b)<br \/>\n    \u2193<br \/>\n    \u251c\u2500 pdds[0..7]        (\u6bcfGPU\u8bbe\u5907\u6570\u636e)<br \/>\n    \u2502   \u251c\u2500 GPU 0\u76f8\u5173\u6570\u636e<br \/>\n    \u2502   \u251c\u2500 GPU 1\u76f8\u5173\u6570\u636e<br \/>\n    \u2502   \u2514\u2500 &#8230;<br \/>\n    \u2502<br \/>\n    \u251c\u2500 pqm               (\u961f\u5217\u7ba1\u7406)<br \/>\n    \u2502   \u251c\u2500 \u8ba1\u7b97\u961f\u5217<br \/>\n    \u2502   \u2514\u2500 SDMA\u961f\u5217<br \/>\n    \u2502<br \/>\n    \u251c\u2500 svms \u2605            (SVM\u7ba1\u7406)<br \/>\n    \u2502   \u251c\u2500 objects       (\u533a\u95f4\u6811&#xff1a;\u5feb\u901f\u67e5\u627e)<br \/>\n    \u2502   \u251c\u2500 list          (\u94fe\u8868&#xff1a;\u987a\u5e8f\u904d\u5386)<br \/>\n    \u2502   \u251c\u2500 restore_work  (\u6062\u590d\u5de5\u4f5c)<br \/>\n    \u2502   \u2514\u2500 deferred_list (\u5ef6\u8fdf\u5904\u7406)<br \/>\n    \u2502<br \/>\n   \u2514\u2500 mmu_notifier      (MMU\u901a\u77e5)<br \/>\n        \u2514\u2500 \u76d1\u542cCPU\u9875\u8868\u53d8\u5316<\/p>\n<h4>\u8fdb\u7a0b\u4e0eSVM\u7684\u5173\u7cfb<\/h4>\n<p>\u4e00\u5bf9\u4e00\u5173\u7cfb&#xff1a;<\/p>\n<p>\u4e00\u4e2a\u8fdb\u7a0b \u2190\u2192 \u4e00\u4e2asvm_range_list<br \/>\n         \u2190\u2192 \u591a\u4e2asvm_range<\/p>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u83b7\u53d6\u8fdb\u7a0b\u7684SVM\u7ba1\u7406\u7ed3\u6784<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kfd_process<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">svm_range_list<\/span> <span class=\"token operator\">*<\/span>svms <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>p<span class=\"token operator\">-&gt;<\/span>svms<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u67e5\u627e\u5305\u542b\u67d0\u5730\u5740\u7684SVM\u8303\u56f4<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">svm_range<\/span> <span class=\"token operator\">*<\/span>prange<span class=\"token punctuation\">;<\/span><br \/>\nprange <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">svm_range_from_addr<\/span><span class=\"token punctuation\">(<\/span>svms<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u904d\u5386\u8fdb\u7a0b\u7684\u6240\u6709SVM\u8303\u56f4<\/span><br \/>\n<span class=\"token function\">list_for_each_entry<\/span><span class=\"token punctuation\">(<\/span>prange<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>svms<span class=\"token operator\">-&gt;<\/span>list<span class=\"token punctuation\">,<\/span> list<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">pr_debug<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Range [0x%lx-0x%lx]\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> prange<span class=\"token operator\">-&gt;<\/span>start<span class=\"token punctuation\">,<\/span> prange<span class=\"token operator\">-&gt;<\/span>last<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h3>5.2 \u8fdb\u7a0b\u521b\u5efa\u65f6\u7684SVM\u521d\u59cb\u5316<\/h3>\n<h4>\u8fdb\u7a0b\u521b\u5efa\u6d41\u7a0b<\/h4>\n<p>\u7528\u6237\u6253\u5f00 \/dev\/kfd<br \/>\n    \u2193<br \/>\nkfd_open()<br \/>\n    \u2193<br \/>\nkfd_create_process(current)<br \/>\n    \u2193<br \/>\ncreate_process(thread, true)<br \/>\n    \u2193<br \/>\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u25021. \u5206\u914dkfd_process        \u2502<br \/>\n\u25022. \u521d\u59cb\u5316\u57fa\u672c\u5b57\u6bb5           \u2502<br \/>\n\u25023. \u521d\u59cb\u5316\u961f\u5217\u7ba1\u7406\u5668         \u2502<br \/>\n\u25024. \u521d\u59cb\u5316apertures        \u2502<br \/>\n\u25025. \u2605svm_range_list_init()\u2502 \u2190 SVM\u521d\u59cb\u5316<br \/>\n\u25026. \u6ce8\u518cMMU notifier       \u2502<br \/>\n\u25027. \u6dfb\u52a0\u5230\u5168\u5c40\u54c8\u5e0c\u8868         \u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n<h4>svm_range_list_init \u8be6\u89e3<\/h4>\n<p><span class=\"token comment\">\/\/ \u6587\u4ef6: kfd_svm.c<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">svm_range_list_init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kfd_process<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">svm_range_list<\/span> <span class=\"token operator\">*<\/span>svms <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>p<span class=\"token operator\">-&gt;<\/span>svms<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> i<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 1. \u521d\u59cb\u5316\u533a\u95f4\u6811&#xff08;\u7ea2\u9ed1\u6811&#xff09;<\/span><br \/>\n    svms<span class=\"token operator\">-&gt;<\/span>objects <span class=\"token operator\">&#061;<\/span> RB_ROOT_CACHED<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u7a7a\u7684\u7ea2\u9ed1\u6811<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 2. \u521d\u59cb\u5316\u4e92\u65a5\u9501<\/span><br \/>\n    <span class=\"token function\">mutex_init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>svms<span class=\"token operator\">-&gt;<\/span>lock<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 3. \u521d\u59cb\u5316\u94fe\u8868<\/span><br \/>\n    <span class=\"token function\">INIT_LIST_HEAD<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>svms<span class=\"token operator\">-&gt;<\/span>list<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 4. \u521d\u59cb\u5316\u72b6\u6001\u8ba1\u6570\u5668<\/span><br \/>\n    <span class=\"token function\">atomic_set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>svms<span class=\"token operator\">-&gt;<\/span>evicted_ranges<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u9a71\u9010\u8ba1\u6570<\/span><br \/>\n    <span class=\"token function\">atomic_set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>svms<span class=\"token operator\">-&gt;<\/span>drain_pagefaults<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ \u6392\u7a7a\u6807\u5fd7<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 5. \u521d\u59cb\u5316\u5de5\u4f5c\u961f\u5217<\/span><br \/>\n    <span class=\"token function\">INIT_DELAYED_WORK<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>svms<span class=\"token operator\">-&gt;<\/span>restore_work<span class=\"token punctuation\">,<\/span> svm_range_restore_work<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">INIT_WORK<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>svms<span class=\"token operator\">-&gt;<\/span>deferred_list_work<span class=\"token punctuation\">,<\/span> svm_range_deferred_list_work<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 6. \u521d\u59cb\u5316\u5ef6\u8fdf\u5217\u8868<\/span><br \/>\n    <span class=\"token function\">INIT_LIST_HEAD<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>svms<span class=\"token operator\">-&gt;<\/span>deferred_range_list<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">spin_lock_init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>svms<span class=\"token operator\">-&gt;<\/span>deferred_list_lock<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 7. \u521d\u59cb\u5316CRIU\u5217\u8868<\/span><br \/>\n    <span class=\"token function\">INIT_LIST_HEAD<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>svms<span class=\"token operator\">-&gt;<\/span>criu_svm_metadata_list<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 8. \u68c0\u67e5\u54ea\u4e9bGPU\u652f\u6301SVM<\/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> p<span class=\"token operator\">-&gt;<\/span>n_pdds<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">KFD_IS_SVM_API_SUPPORTED<\/span><span class=\"token punctuation\">(<\/span>p<span class=\"token operator\">-&gt;<\/span>pdds<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token operator\">-&gt;<\/span>dev<span class=\"token operator\">-&gt;<\/span>adev<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">bitmap_set<\/span><span class=\"token punctuation\">(<\/span>svms<span class=\"token operator\">-&gt;<\/span>bitmap_supported<span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 9. \u8bbe\u7f6e\u9ed8\u8ba4\u7c92\u5ea6<\/span><br \/>\n    svms<span class=\"token operator\">-&gt;<\/span>default_granularity <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">min_t<\/span><span class=\"token punctuation\">(<\/span>u8<span class=\"token punctuation\">,<\/span> amdgpu_svm_default_granularity<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0x1B<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">pr_debug<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Default SVM Granularity: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> svms<span class=\"token operator\">-&gt;<\/span>default_granularity<span class=\"token punctuation\">)<\/span><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>\u521d\u59cb\u5316\u540e\u7684\u72b6\u6001&#xff1a;<\/p>\n<p>p-&gt;svms:<br \/>\n    \u251c\u2500 objects: \u7a7a\u7684\u533a\u95f4\u6811<br \/>\n    \u251c\u2500 list: \u7a7a\u94fe\u8868<br \/>\n    \u251c\u2500 lock: \u5df2\u521d\u59cb\u5316<br \/>\n    \u251c\u2500 evicted_ranges: 0<br \/>\n    \u251c\u2500 drain_pagefaults: 0<br \/>\n    \u251c\u2500 restore_work: \u5df2\u521d\u59cb\u5316&#xff08;\u672a\u8c03\u5ea6&#xff09;<br \/>\n    \u251c\u2500 deferred_list_work: \u5df2\u521d\u59cb\u5316&#xff08;\u672a\u8c03\u5ea6&#xff09;<br \/>\n    \u251c\u2500 bitmap_supported: [1][1][0][0][0][0][0][0]<br \/>\n    \u2502                    (\u5047\u8bbeGPU 0\u548c1\u652f\u6301SVM)<br \/>\n    \u2514\u2500 default_granularity: 9 (512\u9875 &#061; 2MB)<\/p>\n<h4>GPU\u652f\u6301\u68c0\u67e5<\/h4>\n<p><span class=\"token comment\">\/\/ KFD_IS_SVM_API_SUPPORTED \u5b8f\u5b9a\u4e49<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">KFD_IS_SVM_API_SUPPORTED<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>adev<span class=\"token punctuation\">)<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>adev<span class=\"token punctuation\">)<\/span><span class=\"token operator\">-&gt;<\/span>kfd<span class=\"token punctuation\">.<\/span>pgmap<span class=\"token punctuation\">.<\/span>type <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">||<\/span> <span class=\"token punctuation\">(<\/span>adev<span class=\"token punctuation\">)<\/span><span class=\"token operator\">-&gt;<\/span>apu_prefer_gtt<span class=\"token punctuation\">)<\/span><\/span><\/span><\/p>\n<p>\u68c0\u67e5\u6761\u4ef6&#xff1a;<\/p>\n<li>\u8bbe\u5907\u5185\u5b58\u5df2\u6ce8\u518c&#xff1a;pgmap.type !&#061; 0&#xff08;dGPU\u6709VRAM&#xff09;<\/li>\n<li>\u6216\u8005APU\u504f\u597dGTT&#xff1a;apu_prefer_gtt&#xff08;APU\u4f7f\u7528\u7cfb\u7edf\u5185\u5b58&#xff09;<\/li>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ 4\u4e2aGPU\u7cfb\u7edf<\/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> p<span class=\"token operator\">-&gt;<\/span>n_pdds<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">amdgpu_device<\/span> <span class=\"token operator\">*<\/span>adev <span class=\"token operator\">&#061;<\/span> p<span class=\"token operator\">-&gt;<\/span>pdds<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token operator\">-&gt;<\/span>dev<span class=\"token operator\">-&gt;<\/span>adev<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>adev<span class=\"token operator\">-&gt;<\/span>kfd<span class=\"token punctuation\">.<\/span>pgmap<span class=\"token punctuation\">.<\/span>type <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ dGPU&#xff0c;VRAM\u5df2\u6ce8\u518c<\/span><br \/>\n        <span class=\"token function\">bitmap_set<\/span><span class=\"token punctuation\">(<\/span>svms<span class=\"token operator\">-&gt;<\/span>bitmap_supported<span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">pr_debug<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;GPU %d: dGPU with VRAM, SVM supported\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>adev<span class=\"token operator\">-&gt;<\/span>apu_prefer_gtt<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ APU&#xff0c;\u4f7f\u7528\u7cfb\u7edf\u5185\u5b58<\/span><br \/>\n        <span class=\"token function\">bitmap_set<\/span><span class=\"token punctuation\">(<\/span>svms<span class=\"token operator\">-&gt;<\/span>bitmap_supported<span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">pr_debug<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;GPU %d: APU with GTT, SVM supported\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">pr_debug<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;GPU %d: SVM not supported\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>XNACK\u652f\u6301\u68c0\u67e5<\/h4>\n<p><span class=\"token comment\">\/\/ \u5728create_process()\u4e2d<\/span><br \/>\nprocess<span class=\"token operator\">-&gt;<\/span>xnack_enabled <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">kfd_process_xnack_mode<\/span><span class=\"token punctuation\">(<\/span>process<span class=\"token punctuation\">,<\/span> false<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>XNACK (Exception No ACK) \u662fGPU\u9875\u9762\u91cd\u8bd5\u673a\u5236&#xff1a;<\/p>\n<p>XNACK\u542f\u7528:<br \/>\nGPU\u8bbf\u95ee\u5730\u5740 \u2192 \u7f3a\u9875 \u2192 \u53d1\u9001\u4e2d\u65ad \u2192 GPU\u6682\u505c \u2192 \u9a71\u52a8\u5904\u7406 \u2192 GPU\u91cd\u8bd5 \u2192 \u6210\u529f<\/p>\n<p>XNACK\u7981\u7528:<br \/>\nGPU\u8bbf\u95ee\u5730\u5740 \u2192 \u7f3a\u9875 \u2192 GPU\u6302\u8d77&#xff08;\u65e0\u6cd5\u6062\u590d&#xff09;<\/p>\n<p>\u68c0\u67e5\u65b9\u5f0f&#xff1a;<\/p>\n<p>bool <span class=\"token function\">kfd_process_xnack_mode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kfd_process<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">,<\/span> bool supported<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u68c0\u67e5\u6240\u6709GPU\u662f\u5426\u652f\u6301XNACK<\/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> p<span class=\"token operator\">-&gt;<\/span>n_pdds<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>p<span class=\"token operator\">-&gt;<\/span>pdds<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token operator\">-&gt;<\/span>dev<span class=\"token operator\">-&gt;<\/span>kfd<span class=\"token operator\">-&gt;<\/span>device_info<span class=\"token punctuation\">.<\/span>needs_iommu_device<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> false<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4e0d\u652f\u6301<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> true<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h3>5.3 \u8fdb\u7a0b\u9500\u6bc1\u65f6\u7684\u6e05\u7406<\/h3>\n<h4>\u8fdb\u7a0b\u9500\u6bc1\u6d41\u7a0b<\/h4>\n<p>\u8fdb\u7a0b\u9000\u51fa<br \/>\n    \u2193<br \/>\nkfd_process_wq_release()<br \/>\n    \u2193<br \/>\nkfd_process_destroy_delayed()<br \/>\n    \u2193<br \/>\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u25021. \u53d6\u6d88\u6240\u6709\u961f\u5217             \u2502<br \/>\n\u25022. \u91ca\u653e\u4e8b\u4ef6\u8d44\u6e90             \u2502<br \/>\n\u25023. \u2605 svm_range_list_fini()\u2502 \u2190 SVM\u6e05\u7406<br \/>\n\u25024. \u91ca\u653eapertures           \u2502<br \/>\n\u25025. \u9500\u6bc1pdds                \u2502<br \/>\n\u25026. \u4ece\u54c8\u5e0c\u8868\u79fb\u9664             \u2502<br \/>\n\u25027. \u91ca\u653ekfd_process         \u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n<h4>svm_range_list_fini \u8be6\u89e3<\/h4>\n<p><span class=\"token comment\">\/\/ \u6587\u4ef6: kfd_svm.c<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">svm_range_list_fini<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kfd_process<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">svm_range<\/span> <span class=\"token operator\">*<\/span>prange<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">svm_range<\/span> <span class=\"token operator\">*<\/span>next<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">pr_debug<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;process pid %d svms 0x%p\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n             p<span class=\"token operator\">-&gt;<\/span>lead_thread<span class=\"token operator\">-&gt;<\/span>pid<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>p<span class=\"token operator\">-&gt;<\/span>svms<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 1. \u53d6\u6d88\u6062\u590d\u5de5\u4f5c<\/span><br \/>\n    <span class=\"token function\">cancel_delayed_work_sync<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>p<span class=\"token operator\">-&gt;<\/span>svms<span class=\"token punctuation\">.<\/span>restore_work<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 2. \u786e\u4fdd\u5ef6\u8fdf\u5de5\u4f5c\u5b8c\u6210<\/span><br \/>\n    <span class=\"token function\">flush_work<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>p<span class=\"token operator\">-&gt;<\/span>svms<span class=\"token punctuation\">.<\/span>deferred_list_work<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 3. \u505c\u6b62\u65b0\u7684\u7f3a\u9875\u5904\u7406<\/span><br \/>\n    <span class=\"token function\">atomic_set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>p<span class=\"token operator\">-&gt;<\/span>svms<span class=\"token punctuation\">.<\/span>drain_pagefaults<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">svm_range_drain_retry_fault<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>p<span class=\"token operator\">-&gt;<\/span>svms<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 4. \u904d\u5386\u5e76\u6e05\u7406\u6240\u6709\u8303\u56f4<\/span><br \/>\n    <span class=\"token function\">list_for_each_entry_safe<\/span><span class=\"token punctuation\">(<\/span>prange<span class=\"token punctuation\">,<\/span> next<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>p<span class=\"token operator\">-&gt;<\/span>svms<span class=\"token punctuation\">.<\/span>list<span class=\"token punctuation\">,<\/span> list<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u4ece\u5217\u8868\u548c\u533a\u95f4\u6811\u79fb\u9664<\/span><br \/>\n        <span class=\"token function\">svm_range_unlink<\/span><span class=\"token punctuation\">(<\/span>prange<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u79fb\u9664MMU notifier<\/span><br \/>\n        <span class=\"token function\">svm_range_remove_notifier<\/span><span class=\"token punctuation\">(<\/span>prange<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u91ca\u653e\u8303\u56f4&#xff08;\u5305\u62ecDMA\u6620\u5c04\u3001VRAM\u7b49&#xff09;<\/span><br \/>\n        <span class=\"token function\">svm_range_free<\/span><span class=\"token punctuation\">(<\/span>prange<span class=\"token punctuation\">,<\/span> true<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 5. \u9500\u6bc1\u4e92\u65a5\u9501<\/span><br \/>\n    <span class=\"token function\">mutex_destroy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>p<span class=\"token operator\">-&gt;<\/span>svms<span class=\"token punctuation\">.<\/span>lock<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">pr_debug<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;process pid %d svms 0x%p done\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n             p<span class=\"token operator\">-&gt;<\/span>lead_thread<span class=\"token operator\">-&gt;<\/span>pid<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>p<span class=\"token operator\">-&gt;<\/span>svms<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6e05\u7406\u6b65\u9aa4\u8be6\u89e3&#xff1a;<\/p>\n<h5>\u6b65\u9aa41-2&#xff1a;\u505c\u6b62\u5f02\u6b65\u5de5\u4f5c<\/h5>\n<p><span class=\"token comment\">\/\/ \u53d6\u6d88\u5ef6\u8fdf\u6062\u590d\u5de5\u4f5c<\/span><br \/>\n<span class=\"token function\">cancel_delayed_work_sync<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>p<span class=\"token operator\">-&gt;<\/span>svms<span class=\"token punctuation\">.<\/span>restore_work<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5982\u679c\u5de5\u4f5c\u6b63\u5728\u8fd0\u884c&#xff0c;\u7b49\u5f85\u5b8c\u6210<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5237\u65b0\u5ef6\u8fdf\u5217\u8868\u5de5\u4f5c<\/span><br \/>\n<span class=\"token function\">flush_work<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>p<span class=\"token operator\">-&gt;<\/span>svms<span class=\"token punctuation\">.<\/span>deferred_list_work<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u786e\u4fdd\u6240\u6709pending\u7684\u5de5\u4f5c\u90fd\u6267\u884c\u5b8c<\/span><\/p>\n<p>\u4e3a\u4ec0\u4e48\u91cd\u8981&#xff1f;<\/p>\n<ul>\n<li>\u907f\u514d\u5728\u6e05\u7406\u65f6\u8fd8\u6709\u5f02\u6b65\u64cd\u4f5c\u5728\u6267\u884c<\/li>\n<li>\u9632\u6b62use-after-free<\/li>\n<\/ul>\n<h5>\u6b65\u9aa43&#xff1a;\u6392\u7a7a\u7f3a\u9875\u5f02\u5e38<\/h5>\n<p><span class=\"token function\">atomic_set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>p<span class=\"token operator\">-&gt;<\/span>svms<span class=\"token punctuation\">.<\/span>drain_pagefaults<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">svm_range_drain_retry_fault<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>p<span class=\"token operator\">-&gt;<\/span>svms<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4f5c\u7528&#xff1a;<\/p>\n<p>\u8bbe\u7f6edrain_pagefaults\u6807\u5fd7 \u2192 GPU\u7f3a\u9875\u5904\u7406\u51fd\u6570\u68c0\u67e5\u6807\u5fd7<br \/>\n                          \u2193<br \/>\n                     \u5982\u679c\u4e3a1&#xff0c;\u76f4\u63a5\u8fd4\u56de&#xff0c;\u4e0d\u5904\u7406<br \/>\n                          \u2193<br \/>\n                     \u7b49\u5f85\u6240\u6709\u8fdb\u884c\u4e2d\u7684\u7f3a\u9875\u5904\u7406\u5b8c\u6210<\/p>\n<p>\u5b9e\u73b0&#xff1a;<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">svm_range_drain_retry_fault<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">svm_range_list<\/span> <span class=\"token operator\">*<\/span>svms<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">task_struct<\/span> <span class=\"token operator\">*<\/span>task<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7b49\u5f85\u6240\u6709\u7f3a\u9875\u5904\u7406\u4efb\u52a1\u5b8c\u6210<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>task <span class=\"token operator\">&#061;<\/span> svms<span class=\"token operator\">-&gt;<\/span>faulting_task<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u7b49\u5f85\u4efb\u52a1\u9000\u51fa\u7f3a\u9875\u5904\u7406<\/span><br \/>\n        <span class=\"token function\">wait_event_interruptible<\/span><span class=\"token punctuation\">(<\/span>svms<span class=\"token operator\">-&gt;<\/span>wait_drain<span class=\"token punctuation\">,<\/span><br \/>\n                                 svms<span class=\"token operator\">-&gt;<\/span>faulting_task <span class=\"token operator\">!&#061;<\/span> task<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>\u6b65\u9aa44&#xff1a;\u6e05\u7406\u6240\u6709\u8303\u56f4<\/h5>\n<p><span class=\"token function\">list_for_each_entry_safe<\/span><span class=\"token punctuation\">(<\/span>prange<span class=\"token punctuation\">,<\/span> next<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>p<span class=\"token operator\">-&gt;<\/span>svms<span class=\"token punctuation\">.<\/span>list<span class=\"token punctuation\">,<\/span> list<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ a. \u4ece\u6570\u636e\u7ed3\u6784\u79fb\u9664<\/span><br \/>\n    <span class=\"token function\">svm_range_unlink<\/span><span class=\"token punctuation\">(<\/span>prange<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ b. \u79fb\u9664MMU notifier<\/span><br \/>\n    <span class=\"token function\">svm_range_remove_notifier<\/span><span class=\"token punctuation\">(<\/span>prange<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ c. \u91ca\u653e\u8d44\u6e90<\/span><br \/>\n    <span class=\"token function\">svm_range_free<\/span><span class=\"token punctuation\">(<\/span>prange<span class=\"token punctuation\">,<\/span> true<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>svm_range_free \u505a\u4ec0\u4e48&#xff1f;<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">svm_range_free<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">svm_range<\/span> <span class=\"token operator\">*<\/span>prange<span class=\"token punctuation\">,<\/span> bool do_unmap<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ 1. \u53d6\u6d88GPU\u6620\u5c04<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>do_unmap <span class=\"token operator\">&amp;&amp;<\/span> prange<span class=\"token operator\">-&gt;<\/span>mapped_to_gpu<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">svm_range_unmap_from_gpu<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 2. \u91ca\u653eDMA\u6620\u5c04<\/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> MAX_GPU_INSTANCE<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>prange<span class=\"token operator\">-&gt;<\/span>dma_addr<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">svm_range_dma_unmap<\/span><span class=\"token punctuation\">(<\/span>prange<span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">kvfree<\/span><span class=\"token punctuation\">(<\/span>prange<span class=\"token operator\">-&gt;<\/span>dma_addr<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 3. \u91ca\u653eVRAM\u8d44\u6e90<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>prange<span class=\"token operator\">-&gt;<\/span>svm_bo<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">svm_range_vram_node_free<\/span><span class=\"token punctuation\">(<\/span>prange<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 4. \u91ca\u653e\u8303\u56f4\u7ed3\u6784\u672c\u8eab<\/span><br \/>\n    <span class=\"token function\">kfree<\/span><span class=\"token punctuation\">(<\/span>prange<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u6e05\u7406\u8fc7\u7a0b\u53ef\u89c6\u5316<\/h4>\n<p>\u8fdb\u7a0b\u9500\u6bc1\u524d:<br \/>\np-&gt;svms<br \/>\n    \u251c\u2500 range1 [0x1000-0x2000]<br \/>\n    \u2502   \u251c\u2500 DMA\u6620\u5c04 GPU0: [addr0, addr1, &#8230;]<br \/>\n    \u2502   \u251c\u2500 GPU\u9875\u8868\u6620\u5c04 \u2713<br \/>\n    \u2502   \u2514\u2500 MMU notifier \u2713<br \/>\n    \u251c\u2500 range2 [0x3000-0x5000]<br \/>\n    \u2502   \u251c\u2500 svm_bo (VRAM)<br \/>\n    \u2502   \u251c\u2500 GPU\u9875\u8868\u6620\u5c04 \u2713<br \/>\n    \u2502   \u2514\u2500 MMU notifier \u2713<br \/>\n    \u2514\u2500 range3 [0x6000-0x7000]<\/p>\n<p>\u6e05\u7406\u6b65\u9aa4:<br \/>\n1. drain_pagefaults &#061; 1   \u2192 \u505c\u6b62\u65b0\u7f3a\u9875<br \/>\n2. \u6e05\u7406range1:<br \/>\n   &#8211; \u79fb\u9664MMU notifier<br \/>\n   &#8211; \u53d6\u6d88GPU\u6620\u5c04<br \/>\n   &#8211; \u91ca\u653eDMA\u6620\u5c04<br \/>\n   &#8211; \u91ca\u653e\u7ed3\u6784<br \/>\n3. \u6e05\u7406range2:<br \/>\n   &#8211; \u79fb\u9664MMU notifier<br \/>\n   &#8211; \u53d6\u6d88GPU\u6620\u5c04<br \/>\n   &#8211; \u91ca\u653eVRAM (svm_bo)<br \/>\n   &#8211; \u91ca\u653e\u7ed3\u6784<br \/>\n4. \u6e05\u7406range3: &#8230;<\/p>\n<p>\u6e05\u7406\u540e:<br \/>\np-&gt;svms<br \/>\n    \u251c\u2500 objects: \u7a7a\u6811<br \/>\n    \u2514\u2500 list: \u7a7a\u94fe\u8868<\/p>\n<hr \/>\n<h3>5.4 \u591aGPU\u573a\u666f\u4e0b\u7684\u7ba1\u7406<\/h3>\n<h4>\u8fdb\u7a0b\u7684\u591aGPU\u89c6\u56fe<\/h4>\n<p>kfd_process<br \/>\n    \u251c\u2500 pdds[0] \u2192 GPU 0<br \/>\n    \u2502   \u251c\u2500 \u961f\u5217<br \/>\n    \u2502   \u251c\u2500 aperture<br \/>\n    \u2502   \u2514\u2500 VM\u7ba1\u7406<br \/>\n    \u251c\u2500 pdds[1] \u2192 GPU 1<br \/>\n    \u2502   \u251c\u2500 \u961f\u5217<br \/>\n    \u2502   \u251c\u2500 aperture<br \/>\n    \u2502   \u2514\u2500 VM\u7ba1\u7406<br \/>\n    \u251c\u2500 pdds[2] \u2192 GPU 2<br \/>\n    \u2514\u2500 &#8230;<\/p>\n<p>    svms (\u5171\u4eab)<br \/>\n        \u251c\u2500 range1: GPU 0\u548c1\u53ef\u8bbf\u95ee<br \/>\n        \u251c\u2500 range2: \u4ec5GPU 0\u53ef\u8bbf\u95ee<br \/>\n        \u2514\u2500 range3: \u6240\u6709GPU\u53ef\u8bbf\u95ee<\/p>\n<h4>\u591aGPU\u7684SVM\u7b56\u7565<\/h4>\n<h5>1. \u8bbf\u95ee\u4f4d\u56fe\u7ba1\u7406<\/h5>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">svm_range<\/span> <span class=\"token operator\">*<\/span>prange <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8bbe\u7f6eGPU 0\u548c2\u53ef\u4ee5\u8bbf\u95ee<\/span><br \/>\n<span class=\"token function\">set_bit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> prange<span class=\"token operator\">-&gt;<\/span>bitmap_access<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">set_bit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> prange<span class=\"token operator\">-&gt;<\/span>bitmap_access<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ GPU 1\u5c1d\u8bd5\u8bbf\u95ee \u2192 \u7f3a\u9875<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token function\">test_bit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> prange<span class=\"token operator\">-&gt;<\/span>bitmap_access<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u51b3\u5b9a\u7b56\u7565&#xff1a;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u9009\u98791: \u8fc1\u79fb\u5230GPU 1\u7684VRAM<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u9009\u98792: \u4fdd\u6301\u5728\u539f\u4f4d&#xff0c;\u5efa\u7acbP2P\u6620\u5c04<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u9009\u98793: \u4fdd\u6301\u5728\u7cfb\u7edf\u5185\u5b58&#xff0c;GPU 1\u901a\u8fc7PCIe\u8bbf\u95ee<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>2. AIP (Access In Place) \u652f\u6301<\/h5>\n<p>AIP\u5141\u8bb8GPU\u65e0\u9700\u8fc1\u79fb\u5373\u53ef\u8bbf\u95ee\u5176\u4ed6\u4f4d\u7f6e\u7684\u5185\u5b58&#xff1a;<\/p>\n<p>range\u5728GPU 0\u7684VRAM:<br \/>\n    prange-&gt;actual_loc &#061; 0;<br \/>\n    prange-&gt;svm_bo-&gt;node &#061; GPU 0;<\/p>\n<p>GPU 1\u60f3\u8bbf\u95ee:<br \/>\n    \u9009\u98791: \u8fc1\u79fb\u5230GPU 1 (\u6162&#xff0c;\u4f46\u540e\u7eed\u5feb)<br \/>\n    \u9009\u98792: AIP &#8211; \u901a\u8fc7XGMI\u76f4\u63a5\u8bbf\u95eeGPU 0\u7684VRAM (\u65e0\u9700\u8fc1\u79fb)<\/p>\n<p>if (supports_xgmi(GPU0, GPU1)) {<br \/>\n    \/\/ \u4f7f\u7528AIP<br \/>\n    set_bit(1, prange-&gt;bitmap_aip);<br \/>\n    \/\/ \u5efa\u7acbP2P\u6620\u5c04&#xff0c;\u65e0\u9700\u8fc1\u79fb<br \/>\n}<\/p>\n<p>XGMI\u4e92\u8fde\u793a\u4f8b&#xff1a;<\/p>\n<p>      GPU 0 \u2190\u2500XGMI\u2500\u2192 GPU 1<br \/>\n        \u2502              \u2502<br \/>\n      VRAM           VRAM<br \/>\n        \u2502              \u2502<br \/>\n    [range\u6570\u636e]    (\u53ef\u76f4\u63a5\u8bbf\u95ee)<br \/>\n                      \u2191<br \/>\n                   AIP\u6620\u5c04<\/p>\n<h5>3. \u591aGPU\u7f3a\u9875\u5904\u7406<\/h5>\n<p><span class=\"token comment\">\/\/ GPU 1\u8bbf\u95eerange&#xff08;actual_loc &#061; 0&#xff0c;\u5728GPU 0&#xff09;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">svm_range_restore_pages<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ 1. \u68c0\u67e5\u8bbf\u95ee\u4f4d\u56fe<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token function\">test_bit<\/span><span class=\"token punctuation\">(<\/span>gpu_id<span class=\"token punctuation\">,<\/span> prange<span class=\"token operator\">-&gt;<\/span>bitmap_access<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ 2. \u51b3\u5b9a\u7b56\u7565<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">can_use_aip<\/span><span class=\"token punctuation\">(<\/span>prange<span class=\"token punctuation\">,<\/span> gpu_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u4f7f\u7528AIP&#xff0c;\u65e0\u9700\u8fc1\u79fb<\/span><br \/>\n            <span class=\"token function\">set_bit<\/span><span class=\"token punctuation\">(<\/span>gpu_id<span class=\"token punctuation\">,<\/span> prange<span class=\"token operator\">-&gt;<\/span>bitmap_aip<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5efa\u7acbP2P\u6620\u5c04<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">should_migrate<\/span><span class=\"token punctuation\">(<\/span>prange<span class=\"token punctuation\">,<\/span> gpu_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u8fc1\u79fb\u5230\u76ee\u6807GPU<\/span><br \/>\n            <span class=\"token function\">svm_migrate_to_gpu<\/span><span class=\"token punctuation\">(<\/span>prange<span class=\"token punctuation\">,<\/span> gpu_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            prange<span class=\"token operator\">-&gt;<\/span>actual_loc <span class=\"token operator\">&#061;<\/span> gpu_id<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u4fdd\u6301\u5728\u5f53\u524d\u4f4d\u7f6e&#xff0c;\u901a\u8fc7PCIe\u8bbf\u95ee<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 3. \u5efa\u7acbGPU\u9875\u8868\u6620\u5c04<\/span><br \/>\n    <span class=\"token function\">svm_range_map_to_gpu<\/span><span class=\"token punctuation\">(<\/span>prange<span class=\"token punctuation\">,<\/span> gpu_id<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">set_bit<\/span><span class=\"token punctuation\">(<\/span>gpu_id<span class=\"token punctuation\">,<\/span> prange<span class=\"token operator\">-&gt;<\/span>bitmap_access<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u8fc1\u79fb\u7b56\u7565\u793a\u4f8b<\/h4>\n<p><span class=\"token comment\">\/\/ \u81ea\u9002\u5e94\u8fc1\u79fb\u7b56\u7565<\/span><br \/>\nbool <span class=\"token function\">should_migrate_to_gpu<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">svm_range<\/span> <span class=\"token operator\">*<\/span>prange<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">uint32_t<\/span> gpu_id<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ 1. \u5df2\u7ecf\u5728\u76ee\u6807GPU&#xff1f;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>prange<span class=\"token operator\">-&gt;<\/span>actual_loc <span class=\"token operator\">&#061;&#061;<\/span> gpu_id<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> false<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 2. \u68c0\u67e5\u8bbf\u95ee\u6a21\u5f0f<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>prange<span class=\"token operator\">-&gt;<\/span>prefetch_loc <span class=\"token operator\">&#061;&#061;<\/span> gpu_id<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> true<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u7528\u6237\u9884\u53d6\u63d0\u793a<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 3. \u68c0\u67e5\u8bbf\u95ee\u9891\u7387<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>access_frequency<span class=\"token punctuation\">[<\/span>gpu_id<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&gt;<\/span> threshold<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> true<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 4. \u68c0\u67e5AIP\u662f\u5426\u53ef\u7528<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">test_bit<\/span><span class=\"token punctuation\">(<\/span>gpu_id<span class=\"token punctuation\">,<\/span> prange<span class=\"token operator\">-&gt;<\/span>bitmap_aip<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> false<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5df2\u6709AIP&#xff0c;\u65e0\u9700\u8fc1\u79fb<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 5. \u9ed8\u8ba4&#xff1a;\u6839\u636e\u7c92\u5ea6\u548c\u5927\u5c0f\u51b3\u5b9a<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>prange<span class=\"token operator\">-&gt;<\/span>npages <span class=\"token operator\">&lt;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">&lt;&lt;<\/span> prange<span class=\"token operator\">-&gt;<\/span>granularity<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> true<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5c0f\u8303\u56f4&#xff0c;\u8fc1\u79fb\u6210\u672c\u4f4e<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> false<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h3>&#x1f4a1; \u91cd\u70b9\u63d0\u793a<\/h3>\n<li>\n<p>\u8fdb\u7a0b\u7ea7\u7ba1\u7406&#xff1a;SVM\u662f\u4ee5\u8fdb\u7a0b\u4e3a\u5355\u4f4d\u7ba1\u7406\u7684&#xff0c;\u6bcf\u4e2a\u8fdb\u7a0b\u6709\u72ec\u7acb\u7684svms\u3002<\/p>\n<\/li>\n<li>\n<p>\u751f\u547d\u5468\u671f\u7ba1\u7406&#xff1a;SVM\u521d\u59cb\u5316\u5728\u8fdb\u7a0b\u521b\u5efa\u65f6&#xff0c;\u6e05\u7406\u5728\u8fdb\u7a0b\u9500\u6bc1\u65f6&#xff0c;\u786e\u4fdd\u8d44\u6e90\u4e0d\u6cc4\u6f0f\u3002<\/p>\n<\/li>\n<li>\n<p>\u5f02\u6b65\u64cd\u4f5c\u6392\u7a7a&#xff1a;\u8fdb\u7a0b\u9500\u6bc1\u524d\u5fc5\u987b\u786e\u4fdd\u6240\u6709\u5f02\u6b65\u64cd\u4f5c\u5b8c\u6210&#xff0c;\u5305\u62ec\u5de5\u4f5c\u961f\u5217\u548c\u7f3a\u9875\u5904\u7406\u3002<\/p>\n<\/li>\n<li>\n<p>\u591aGPU\u5171\u4eab&#xff1a;\u4e00\u4e2a\u8fdb\u7a0b\u7684SVM\u8303\u56f4\u53ef\u4ee5\u88ab\u591a\u4e2aGPU\u5171\u4eab&#xff0c;\u901a\u8fc7\u4f4d\u56fe\u7ba1\u7406\u8bbf\u95ee\u6743\u9650\u3002<\/p>\n<\/li>\n<li>\n<p>XNACK\u662f\u5173\u952e&#xff1a;\u6ca1\u6709XNACK&#xff0c;GPU\u7f3a\u9875\u4f1a\u5bfc\u81f4\u6302\u8d77&#xff0c;SVM\u65e0\u6cd5\u5de5\u4f5c\u3002<\/p>\n<\/li>\n<hr \/>\n<h3>\u26a0\ufe0f \u5e38\u89c1\u8bef\u533a<\/h3>\n<p>\u274c \u8bef\u533a1&#xff1a;\u201c\u6bcf\u4e2aGPU\u6709\u72ec\u7acb\u7684SVM\u7ba1\u7406\u201d<\/p>\n<ul>\n<li>\u2705 \u6b63\u786e\u7406\u89e3&#xff1a;\u4e00\u4e2a\u8fdb\u7a0b\u53ea\u6709\u4e00\u4e2asvms&#xff0c;\u88ab\u6240\u6709GPU\u5171\u4eab\u3002<\/li>\n<\/ul>\n<p>\u274c \u8bef\u533a2&#xff1a;\u201c\u8fdb\u7a0b\u9000\u51fa\u65f6\u5185\u6838\u4f1a\u81ea\u52a8\u6e05\u7406SVM\u201d<\/p>\n<ul>\n<li>\u2705 \u6b63\u786e\u7406\u89e3&#xff1a;\u9700\u8981\u663e\u5f0f\u8c03\u7528svm_range_list_fini\u6e05\u7406\u8d44\u6e90\u3002<\/li>\n<\/ul>\n<p>\u274c \u8bef\u533a3&#xff1a;\u201cbitmap_supported\u4e00\u76f4\u4e0d\u53d8\u201d<\/p>\n<ul>\n<li>\u2705 \u6b63\u786e\u7406\u89e3&#xff1a;GPU\u70ed\u63d2\u62d4\u6216runtime\u53d8\u5316\u65f6\u53ef\u80fd\u6539\u53d8\u3002<\/li>\n<\/ul>\n<p>\u274c \u8bef\u533a4&#xff1a;\u201c\u6e05\u7406\u987a\u5e8f\u65e0\u5173\u7d27\u8981\u201d<\/p>\n<ul>\n<li>\u2705 \u6b63\u786e\u7406\u89e3&#xff1a;\u5fc5\u987b\u5148\u6392\u7a7a\u5f02\u6b65\u64cd\u4f5c&#xff0c;\u518d\u6e05\u7406\u6570\u636e\u7ed3\u6784&#xff0c;\u987a\u5e8f\u9519\u8bef\u4f1a\u5d29\u6e83\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>&#x1f4dd; \u5b9e\u8df5\u7ec3\u4e60<\/h3>\n<li>\n<p>\u4ee3\u7801\u8ffd\u8e2a&#xff1a;<\/p>\n<p> <span class=\"token comment\"># \u67e5\u627e\u8fdb\u7a0b\u521b\u5efa<\/span><br \/>\n<span class=\"token function\">grep<\/span> -n <span class=\"token string\">&#034;create_process&#034;<\/span> drivers\/gpu\/drm\/amd\/amdkfd\/kfd_process.c<\/p>\n<p><span class=\"token comment\"># \u67e5\u627eSVM\u521d\u59cb\u5316<\/span><br \/>\n<span class=\"token function\">grep<\/span> -A <span class=\"token number\">20<\/span> <span class=\"token string\">&#034;svm_range_list_init&#034;<\/span> drivers\/gpu\/drm\/amd\/amdkfd\/kfd_svm.c<\/p>\n<p><span class=\"token comment\"># \u67e5\u627eSVM\u6e05\u7406<\/span><br \/>\n<span class=\"token function\">grep<\/span> -A <span class=\"token number\">30<\/span> <span class=\"token string\">&#034;svm_range_list_fini&#034;<\/span> drivers\/gpu\/drm\/amd\/amdkfd\/kfd_svm.c\n <\/li>\n<li>\n<p>\u601d\u8003\u9898&#xff1a;<\/p>\n<ul>\n<li>\u4e3a\u4ec0\u4e48\u8981\u5728\u6e05\u7406\u524d\u8bbe\u7f6edrain_pagefaults\u6807\u5fd7&#xff1f;<\/li>\n<li>\u5982\u679c\u4e0d\u8c03\u7528cancel_delayed_work_sync\u4f1a\u53d1\u751f\u4ec0\u4e48&#xff1f;<\/li>\n<li>\u591a\u4e2aGPU\u8bbf\u95ee\u540c\u4e00\u4e2arange\u65f6&#xff0c;\u5982\u4f55\u907f\u514d\u91cd\u590d\u8fc1\u79fb&#xff1f;<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u8c03\u8bd5\u7ec3\u4e60&#xff1a;<\/p>\n<p> <span class=\"token comment\"># \u67e5\u770b\u8fdb\u7a0b\u7684SVM\u4fe1\u606f&#xff08;\u9700\u8981debugfs&#xff09;<\/span><br \/>\n<span class=\"token function\">cat<\/span> \/sys\/kernel\/debug\/dri\/0\/kfd\/proc\/<span class=\"token operator\">&lt;<\/span>pid<span class=\"token operator\">&gt;<\/span>\/svm<\/p>\n<p><span class=\"token comment\"># \u67e5\u770bGPU\u652f\u6301\u60c5\u51b5<\/span><br \/>\n<span class=\"token function\">dmesg<\/span> <span class=\"token operator\">|<\/span> <span class=\"token function\">grep<\/span> <span class=\"token string\">&#034;SVM.*supported&#034;<\/span>\n <\/li>\n<li>\n<p>\u753b\u56fe\u7ec3\u4e60&#xff1a; \u753b\u51fa\u8fdb\u7a0b\u521b\u5efa\u548c\u9500\u6bc1\u65f6SVM\u72b6\u6001\u7684\u53d8\u5316\u65f6\u5e8f\u56fe\u3002<\/p>\n<\/li>\n<hr \/>\n<h3>&#x1f4da; \u672c\u7ae0\u5c0f\u7ed3<\/h3>\n<ul>\n<li>kfd_process: \u6bcf\u4e2a\u4f7f\u7528GPU\u8ba1\u7b97\u7684\u8fdb\u7a0b\u90fd\u6709\u4e00\u4e2a&#xff0c;\u5305\u542bsvms\u5b57\u6bb5<\/li>\n<li>\u521d\u59cb\u5316: svm_range_list_init\u5728\u8fdb\u7a0b\u521b\u5efa\u65f6\u8c03\u7528&#xff0c;\u521d\u59cb\u5316\u6570\u636e\u7ed3\u6784\u548c\u5de5\u4f5c\u961f\u5217<\/li>\n<li>\u6e05\u7406: svm_range_list_fini\u5728\u8fdb\u7a0b\u9500\u6bc1\u65f6\u8c03\u7528&#xff0c;\u6392\u7a7a\u5f02\u6b65\u64cd\u4f5c\u5e76\u91ca\u653e\u6240\u6709\u8d44\u6e90<\/li>\n<li>\u591aGPU: \u4e00\u4e2a\u8fdb\u7a0b\u7684SVM\u8303\u56f4\u53ef\u88ab\u591aGPU\u5171\u4eab&#xff0c;\u901a\u8fc7\u4f4d\u56fe\u7ba1\u7406\u8bbf\u95ee\u6743\u9650<\/li>\n<li>XNACK: GPU\u9875\u9762\u91cd\u8bd5\u673a\u5236&#xff0c;\u662fSVM\u6b63\u5e38\u5de5\u4f5c\u7684\u5fc5\u8981\u6761\u4ef6<\/li>\n<\/ul>\n<p>\u7406\u89e3\u8fdb\u7a0b\u4e0eSVM\u7684\u5173\u7cfb\u662f\u638c\u63e1SVM\u751f\u547d\u5468\u671f\u7ba1\u7406\u7684\u5173\u952e\u3002<\/p>\n<hr \/>\n<h3>\u27a1\ufe0f \u4e0b\u4e00\u6b65<\/h3>\n<p>\u5b8c\u6210\u4e86\u6570\u636e\u7ed3\u6784\u7bc7&#xff0c;\u6211\u4eec\u5df2\u7ecf\u7406\u89e3\u4e86SVM\u7684&#034;\u9aa8\u67b6&#034;\u3002\u63a5\u4e0b\u6765\u8fdb\u5165\u6838\u5fc3\u529f\u80fd\u7bc7&#xff0c;\u6211\u4eec\u5c06\u5b66\u4e60SVM\u7684\u6838\u5fc3\u64cd\u4f5c&#xff1a;\u8303\u56f4\u7ba1\u7406\u3001\u9875\u9762\u8fc1\u79fb\u3001GPU\u6620\u5c04\u548c\u7f3a\u9875\u5904\u7406\u3002<\/p>\n<hr \/>\n<p>&#x1f517; \u5bfc\u822a<\/p>\n<ul>\n<li>\u4e0a\u4e00\u7ae0&#xff1a;04 &#8211; 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