{"id":123924,"date":"2026-11-08T14:02:07","date_gmt":"2026-11-08T06:02:07","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/123924.html"},"modified":"2026-11-08T14:02:07","modified_gmt":"2026-11-08T06:02:07","slug":"%e7%94%a8%e6%88%b7%e6%80%81%e6%8e%a5%e5%8f%a3%ef%bc%88userland-interfaces%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/123924.html","title":{"rendered":"\u7528\u6237\u6001\u63a5\u53e3\uff08Userland interfaces\uff09"},"content":{"rendered":"<h2>\u7528\u6237\u6001\u63a5\u53e3&#xff08;Userland interfaces&#xff09;<\/h2>\n<p>DRM \u6838\u5fc3\u5411\u5e94\u7528\u7a0b\u5e8f\u5bfc\u51fa\u4e86\u82e5\u5e72\u63a5\u53e3&#xff0c;\u901a\u5e38\u901a\u8fc7\u76f8\u5e94\u7684 libdrm \u5c01\u88c5\u51fd\u6570\u6765\u4f7f\u7528\u3002\u6b64\u5916&#xff0c;\u9a71\u52a8\u8fd8\u901a\u8fc7 ioctl \u548c sysfs \u6587\u4ef6\u5bfc\u51fa\u8bbe\u5907\u7279\u5b9a\u7684\u63a5\u53e3&#xff0c;\u4f9b\u7528\u6237\u6001\u9a71\u52a8\u548c\u8bbe\u5907\u611f\u77e5\u7684\u5e94\u7528\u7a0b\u5e8f\u4f7f\u7528\u3002\u5916\u90e8\u63a5\u53e3\u5305\u62ec&#xff1a;\u5185\u5b58\u6620\u5c04\u3001\u4e0a\u4e0b\u6587\u7ba1\u7406\u3001DMA \u64cd\u4f5c\u3001AGP \u7ba1\u7406\u3001vblank \u63a7\u5236\u3001fence \u7ba1\u7406\u3001\u5185\u5b58\u7ba1\u7406\u548c\u8f93\u51fa\u7ba1\u7406\u3002\u6b64\u5904\u6db5\u76d6\u901a\u7528 ioctl \u548c sysfs \u5e03\u5c40\u3002\u6211\u4eec\u53ea\u9700\u8981\u9ad8\u5c42\u4fe1\u606f&#xff0c;\u56e0\u4e3a\u624b\u518c\u9875\u4f1a\u6db5\u76d6\u5176\u4f59\u5185\u5bb9\u3002<\/p>\n<hr \/>\n<h3>libdrm \u8bbe\u5907\u67e5\u627e&#xff08;libdrm Device Lookup&#xff09;<\/h3>\n<p>\u5f53\u5fc3\u9677\u9631&#xff01;\u6ce8\u610f\u6697\u5751&#xff01;<\/p>\n<p>\u4e3a\u4e86\u8b66\u544a\u5176\u4ed6\u8bd5\u56fe\u641e\u6e05\u695a\u8fd9\u91cc\u5230\u5e95\u600e\u4e48\u56de\u4e8b\u7684\u4eba&#xff0c;\u6211\u6765\u603b\u7ed3\u4e00\u4e0b\u8fd9\u4e2a\u6545\u4e8b\u3002<\/p>\n<p>\u9996\u5148&#xff0c;\u8ba9\u6211\u4eec\u7406\u6e05\u547d\u540d&#xff0c;\u56e0\u4e3a\u5185\u6838\u5185\u90e8\u5b9e\u73b0\u3001libdrm \u548c ioctl \u7684\u547d\u540d\u5404\u4e0d\u76f8\u540c&#xff1a;<\/p>\n<ul>\n<li>GET_UNIQUE ioctl&#xff0c;\u7531 drm_getunique \u5b9e\u73b0&#xff0c;\u5728 libdrm \u4e2d\u901a\u8fc7 drmGetBusid \u51fd\u6570\u5c01\u88c5\u3002<\/li>\n<li>libdrm \u7684 drmSetBusid \u51fd\u6570\u7531 SET_UNIQUE ioctl \u652f\u6491\u3002<\/li>\n<li>\u6240\u6709\u8fd9\u4e9b\u4ee3\u7801\u5728\u5185\u6838\u4e2d\u5df2\u88ab drm_invalid_op() \u5e9f\u5f03\u3002<\/li>\n<li>\u5185\u90e8\u7684 set_busid \u5185\u6838\u51fd\u6570\u548c\u9a71\u52a8\u56de\u8c03\u4ec5\u4f9b SET_VERSION ioctl \u4f7f\u7528&#xff0c;\u56e0\u4e3a\u53ea\u6709 drm 1.0&#xff08;\u5df2\u5e9f\u5f03&#xff09;\u624d\u5141\u8bb8\u7528\u6237\u6001\u901a\u8fc7\u4e0a\u8ff0 ioctl \u8bbe\u7f6e busid\u3002<\/li>\n<\/ul>\n<p>\u5176\u4ed6\u6d89\u53ca\u7684 ioctl \u548c\u51fd\u6570\u547d\u540d\u662f\u4e00\u81f4\u7684\u3002<\/p>\n<p>\u5bf9\u4e8e\u60f3\u77e5\u9053 drm 1.1 \u548c 1.4 \u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b\u7684\u4eba&#xff1a;\u6b63\u786e\u5904\u7406 ppc \u4e0a busid \u4e2d\u7684 PCI \u57df\u3002\u8fd9\u4e00\u70b9\u76f4\u5230 2010 \u5e74\u624d\u5728 libdrm \u4e2d\u6b63\u786e\u5b9e\u73b0&#xff0c;\u56e0\u6b64\u8fd8\u4e0d\u80fd\u5e9f\u5f03\u3002\u6ca1\u4eba\u77e5\u9053 drm 1.2 \u548c 1.3 \u6709\u4ec0\u4e48\u7279\u522b\u4e4b\u5904\u3002<\/p>\n<p>\u73b0\u5728\u8bb2\u8bb2 DRM \u4e2d\u8bbe\u5907\u67e5\u627e\u7684\u5b9e\u9645&#034;\u6050\u6016\u6545\u4e8b&#034;\u3002\u5927\u4f53\u4e0a\u6709\u4e24\u79cd\u65b9\u5f0f&#xff1a;\u6309 busid \u67e5\u627e&#xff0c;\u6216\u6309\u8bbe\u5907\u9a71\u52a8\u540d\u79f0\u67e5\u627e\u3002<\/p>\n<p>\u6309 busid \u6253\u5f00\u76f8\u5f53\u7b80\u5355&#xff1a;<\/p>\n<li>\u9996\u5148\u8c03\u7528 SET_VERSION \u786e\u4fdd PCI \u57df\u88ab\u6b63\u786e\u5904\u7406\u3002\u526f\u4f5c\u7528\u662f\u8fd9\u4f1a\u5728 master \u7ed3\u6784\u4f53\u4e2d\u586b\u5165 unique \u540d\u79f0\u3002<\/li>\n<li>\u8c03\u7528 GET_UNIQUE \u4ece master \u7ed3\u6784\u4f53\u4e2d\u8bfb\u51fa unique \u540d\u79f0&#xff0c;\u7531\u4e8e\u6b65\u9aa4 1&#xff0c;\u5b83\u4e0e busid \u5339\u914d\u3002<\/li>\n<li>\u5982\u679c\u4e0d\u5339\u914d&#xff0c;\u5219\u7ee7\u7eed\u5c1d\u8bd5\u4e0b\u4e00\u4e2a\u8bbe\u5907\u8282\u70b9\u3002<\/li>\n<p>\u6309\u540d\u79f0\u6253\u5f00\u7565\u6709\u4e0d\u540c&#xff1a;<\/p>\n<li>\u76f4\u63a5\u8c03\u7528 VERSION \u83b7\u53d6\u7248\u672c&#xff0c;\u5e76\u4e0e\u8be5 ioctl \u8fd4\u56de\u7684\u9a71\u52a8\u540d\u79f0\u8fdb\u884c\u5339\u914d\u3002\u6ce8\u610f\u6ca1\u6709\u8c03\u7528 SET_VERSION&#xff0c;\u8fd9\u610f\u5473\u7740\u521a\u6253\u5f00\u7684 master \u8282\u70b9\u7684 unique \u540d\u79f0\u6ca1\u6709\u88ab\u586b\u5165\u3002\u5c3d\u7ba1\u5f53\u524d DRM \u8bbe\u5907\u8282\u70b9\u59cb\u7ec8\u7ed1\u5b9a\u5230\u4e00\u4e2a\u8bbe\u5907&#xff0c;\u4e0d\u50cf drm 1.0 \u90a3\u6837\u53ef\u4ee5\u5728\u8fd0\u884c\u65f6\u5206\u914d\u3002<\/li>\n<li>\u5339\u914d\u9a71\u52a8\u540d\u79f0\u3002\u5982\u679c\u4e0d\u5339\u914d&#xff0c;\u5219\u7ee7\u7eed\u4e0b\u4e00\u4e2a\u8bbe\u5907\u8282\u70b9\u3002<\/li>\n<li>\u8c03\u7528 GET_UNIQUE&#xff0c;\u68c0\u67e5 unique \u540d\u79f0\u957f\u5ea6\u662f\u5426\u4e3a\u96f6&#xff08;\u901a\u8fc7\u68c0\u67e5\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u4e2a\u5b57\u8282\u662f\u5426\u4e3a 0&#xff09;\u3002\u5982\u679c\u4e0d\u662f&#xff0c;libdrm \u5c06\u8df3\u8fc7\u5e76\u7ee7\u7eed\u4e0b\u4e00\u4e2a\u8bbe\u5907\u8282\u70b9\u3002\u8fd9\u5927\u6982\u53ea\u662f\u4ece drm 1.0 \u65f6\u4ee3\u590d\u5236\u7c98\u8d34\u7684\u9057\u7559\u4ee3\u7801\u2014\u2014\u5f53\u65f6 unique \u540d\u79f0\u88ab\u8bbe\u7f6e\u610f\u5473\u7740\u9a71\u52a8\u5df2\u88ab\u5360\u7528&#xff0c;\u4f46\u8fd9\u53ea\u662f\u731c\u6d4b\u3002<\/li>\n<p>\u957f\u8bdd\u77ed\u8bf4&#xff1a;\u4e3a\u4e86\u4fdd\u6301\u6309\u540d\u79f0\u6253\u5f00\u7684\u903b\u8f91\u6b63\u5e38\u5de5\u4f5c&#xff0c;\u5f53 SET_VERSION \u5c1a\u672a\u88ab\u8c03\u7528\u65f6&#xff0c;GET_UNIQUE \u4e0d\u80fd\u8fd4\u56de unique \u5b57\u7b26\u4e32&#xff0c;\u5426\u5219 libdrm \u5c31\u4f1a\u5d29\u6e83\u3002\u5373\u4f7f\u8be5 unique \u5b57\u7b26\u4e32\u6c38\u8fdc\u65e0\u6cd5\u66f4\u6539&#xff0c;\u800c\u4e14\u4e0e\u5b9e\u9645\u6253\u5f00\u8bbe\u5907\u5b8c\u5168\u65e0\u5173\u2014\u2014\u56e0\u4e3a\u8fd0\u884c\u65f6\u53ef\u5206\u914d\u7684\u8bbe\u5907\u5b9e\u4f8b\u4ec5\u5728 drm 1.0 \u4e2d\u652f\u6301&#xff0c;\u800c drm 1.0 \u65e9\u5df2\u6d88\u4ea1\u3002\u4f46 libdrm \u4e2d drmOpenByName \u7684\u4ee3\u7801\u5c31\u662f\u6d3b\u4e86\u4e0b\u6765&#xff0c;\u56e0\u6b64\u4e0d\u80fd\u7834\u574f\u5b83\u3002<\/p>\n<hr \/>\n<h3>\u4e3b\u8282\u70b9\u3001DRM Master \u548c\u8ba4\u8bc1&#xff08;Primary Nodes, DRM Master and Authentication&#xff09;<\/h3>\n<p>struct drm_master \u7528\u4e8e\u8ddf\u8e2a\u5df2\u6253\u5f00\u4e3b\u8bbe\u5907\u8282\u70b9\u7684\u5ba2\u6237\u7aef\u7ec4\u3002\u5bf9\u4e8e\u6bcf\u4e2a\u66fe\u7ecf\u81f3\u5c11\u4e00\u6b21\u6210\u529f\u6210\u4e3a\u8bbe\u5907 master \u7684 struct drm_file&#xff08;\u65e0\u8bba\u662f\u901a\u8fc7 SET_MASTER IOCTL&#xff0c;\u8fd8\u662f\u5728\u5f53\u524d\u6ca1\u6709\u5176\u4ed6 master \u65f6\u901a\u8fc7\u6253\u5f00\u4e3b\u8bbe\u5907\u8282\u70b9\u9690\u5f0f\u83b7\u5f97&#xff09;&#xff0c;\u90fd\u5b58\u5728\u4e00\u4e2a drm_master\u3002\u8fd9\u8bb0\u5f55\u5728 drm_file.is_master \u4e2d\u3002\u6240\u6709\u5176\u4ed6\u5ba2\u6237\u7aef\u4ec5\u6301\u6709\u4e00\u4e2a\u6307\u5411\u5176\u5173\u8054 drm_master \u7684\u6307\u9488\u3002<\/p>\n<p>\u6b64\u5916&#xff0c;\u4e00\u4e2a drm_device \u53ea\u80fd\u6709\u4e00\u4e2a drm_master \u4f5c\u4e3a\u5f53\u524d master\u3002\u5b83\u53ef\u4ee5\u901a\u8fc7 DROP_MASTER \u548c SET_MASTER IOCTL \u5207\u6362&#xff0c;\u4e5f\u53ef\u4ee5\u901a\u8fc7\u5173\u95ed\/\u6253\u5f00\u4e3b\u8bbe\u5907\u8282\u70b9\u9690\u5f0f\u5207\u6362\u3002\u53e6\u89c1 drm_is_current_master()\u3002<\/p>\n<p>\u5ba2\u6237\u7aef\u53ef\u4ee5\u4f7f\u7528 GETMAGIC \u548c AUTHMAGIC IOCTL \u5411\u5f53\u524d master \u8ba4\u8bc1&#xff08;\u5982\u679c\u5b83\u4e0e\u81ea\u5df1\u7684 master \u5339\u914d&#xff09;\u3002\u914d\u5408 master \u7684\u4ea4\u6362&#xff0c;\u8fd9\u4f7f\u5f97\u4e00\u7ec4\u4e92\u76f8\u4fe1\u4efb\u7684\u5ba2\u6237\u7aef\u53ef\u4ee5\u53d7\u63a7\u5730\u8bbf\u95ee\u8bbe\u5907\u3002<\/p>\n<h4>bool drm_is_current_master(struct drm_file *fpriv) \u2014 \u68c0\u67e5 priv \u662f\u5426\u4e3a\u5f53\u524d master<\/h4>\n<p>\u53c2\u6570<\/p>\n<ul>\n<li>struct drm_file *fpriv \u2014 DRM \u6587\u4ef6\u79c1\u6709\u6570\u636e<\/li>\n<\/ul>\n<p>\u63cf\u8ff0<\/p>\n<p>\u68c0\u67e5 fpriv \u662f\u5426\u4e3a\u5176\u8bbe\u5907\u4e0a\u7684\u5f53\u524d master\u3002\u8fd9\u51b3\u5b9a\u5ba2\u6237\u7aef\u662f\u5426\u88ab\u5141\u8bb8\u6267\u884c DRM_MASTER IOCTL\u3002<\/p>\n<p>\u5927\u591a\u6570\u9700\u8981 DRM_MASTER \u7684\u73b0\u4ee3 IOCTL \u7528\u4e8e\u5185\u6838\u6a21\u5f0f\u8bbe\u7f6e&#xff08;kernel modesetting&#xff09;\u2014\u2014\u5f53\u524d master \u88ab\u8ba4\u4e3a\u62e5\u6709\u4e0d\u53ef\u5171\u4eab\u7684\u663e\u793a\u786c\u4ef6\u3002<\/p>\n<h4>struct drm_master *drm_master_get(struct drm_master *master) \u2014 \u5f15\u7528 master \u6307\u9488<\/h4>\n<p>\u53c2\u6570<\/p>\n<ul>\n<li>struct drm_master *master \u2014 struct drm_master<\/li>\n<\/ul>\n<p>\u63cf\u8ff0<\/p>\n<p>\u9012\u589e master \u7684\u5f15\u7528\u8ba1\u6570\u5e76\u8fd4\u56de\u6307\u5411 master \u7684\u6307\u9488\u3002<\/p>\n<h4>struct drm_master *drm_file_get_master(struct drm_file *file_priv) \u2014 \u5f15\u7528 file_priv \u7684 drm_file.master<\/h4>\n<p>\u53c2\u6570<\/p>\n<ul>\n<li>struct drm_file *file_priv \u2014 DRM \u6587\u4ef6\u79c1\u6709\u6570\u636e<\/li>\n<\/ul>\n<p>\u63cf\u8ff0<\/p>\n<p>\u9012\u589e file_priv \u7684 drm_file.master \u7684\u5f15\u7528\u8ba1\u6570\u5e76\u8fd4\u56de drm_file.master\u3002\u5982\u679c file_priv \u6ca1\u6709 drm_file.master&#xff0c;\u5219\u8fd4\u56de NULL\u3002<\/p>\n<p>\u4ece\u6b64\u51fd\u6570\u8fd4\u56de\u7684 master \u6307\u9488\u5e94\u4f7f\u7528 drm_master_put() \u89e3\u9664\u5f15\u7528\u3002<\/p>\n<h4>void drm_master_put(struct drm_master **master) \u2014 \u89e3\u9664\u5f15\u7528\u5e76\u6e05\u7a7a master \u6307\u9488<\/h4>\n<p>\u53c2\u6570<\/p>\n<ul>\n<li>struct drm_master **master \u2014 \u6307\u5411 struct drm_master \u6307\u9488\u7684\u6307\u9488<\/li>\n<\/ul>\n<p>\u63cf\u8ff0<\/p>\n<p>\u9012\u51cf master \u80cc\u540e\u7684 drm_master \u7684\u5f15\u7528\u8ba1\u6570\u5e76\u5c06\u5176\u8bbe\u7f6e\u4e3a NULL\u3002<\/p>\n<h4>struct drm_master \u2014 DRM master \u7ed3\u6784\u4f53<\/h4>\n<p>\u5b9a\u4e49&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">drm_master<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kref<\/span> refcount<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">drm_device<\/span> <span class=\"token operator\">*<\/span>dev<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>unique<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> unique_len<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">idr<\/span> magic_map<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>driver_priv<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">drm_master<\/span> <span class=\"token operator\">*<\/span>lessor<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> lessee_id<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">list_head<\/span> lessee_list<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">list_head<\/span> lessees<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">idr<\/span> leases<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">idr<\/span> lessee_idr<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6210\u5458<\/p>\n<ul>\n<li>refcount \u2014 \u6b64 master \u5bf9\u8c61\u7684\u5f15\u7528\u8ba1\u6570\u3002<\/li>\n<li>dev \u2014 \u56de\u94fe\u5230 DRM \u8bbe\u5907\u3002<\/li>\n<li>unique \u2014 \u552f\u4e00\u6807\u8bc6\u7b26&#xff1a;\u4f8b\u5982 busid\u3002\u53d7 drm_device.master_mutex \u4fdd\u62a4\u3002<\/li>\n<li>unique_len \u2014 unique \u5b57\u6bb5\u7684\u957f\u5ea6\u3002\u53d7 drm_device.master_mutex \u4fdd\u62a4\u3002<\/li>\n<li>magic_map \u2014 \u5df2\u4f7f\u7528\u7684\u8ba4\u8bc1\u4ee4\u724c\u6620\u5c04\u3002\u53d7 drm_device.master_mutex \u4fdd\u62a4\u3002<\/li>\n<li>driver_priv \u2014 \u9a71\u52a8\u79c1\u6709\u4fe1\u606f\u7684\u6307\u9488\u3002<\/li>\n<li>lessor \u2014 \u79df\u7ea6\u6388\u4e88\u8005&#xff08;lease grantor&#xff09;&#xff0c;\u4ec5\u5f53\u6b64 struct drm_master \u8868\u793a\u6301\u6709\u6765\u81ea lessor \u7684\u5bf9\u8c61\u79df\u7ea6\u7684\u627f\u79df\u4eba\u65f6\u624d\u8bbe\u7f6e\u3002\u8bbe\u5907\u7684\u5b8c\u5168\u6240\u6709\u8005\u5c06\u6b64\u8bbe\u7f6e\u4e3a NULL\u3002<br \/>\nlessor \u4e00\u65e6\u5728 drm_lease_create() \u4e2d\u8bbe\u7f6e\u5c31\u4e0d\u518d\u66f4\u6539&#xff0c;\u6bcf\u4e2a\u627f\u79df\u4eba\u6301\u6709\u5bf9\u5176 lessor \u7684\u5f15\u7528&#xff0c;\u5728 drm_lease_destroy() \u4e2d\u88ab\u9500\u6bc1\u65f6\u91ca\u653e\u3002<br \/>\n\u53e6\u89c1\u663e\u793a\u8d44\u6e90\u79df\u7ea6&#xff08;display resource leasing&#xff09;\u4e00\u8282\u3002<\/li>\n<li>lessee_id \u2014 \u627f\u79df\u4eba\u7684 ID\u3002\u6240\u6709\u8005&#xff08;\u5373 lessor \u4e3a NULL&#xff09;\u7684 ID \u59cb\u7ec8\u4e3a 0\u3002\u53d7 drm_device.mode_config \u7684 drm_mode_config.idr_mutex \u4fdd\u62a4\u3002<\/li>\n<li>lessee_list \u2014 lessor \u7684\u627f\u79df\u4eba\u5217\u8868\u6761\u76ee&#xff0c;\u94fe\u63a5\u5230 lessees\u3002\u6240\u6709\u8005\u4e0d\u4f7f\u7528\u3002\u53d7 drm_device.mode_config \u7684 drm_mode_config.idr_mutex \u4fdd\u62a4\u3002<\/li>\n<li>lessees \u2014 \u4ece\u6b64 master \u79df\u8d41\u7684 drm_masters \u5217\u8868\u3002\u53d7 drm_device.mode_config \u7684 drm_mode_config.idr_mutex \u4fdd\u62a4\u3002<br \/>\n\u5982\u679c\u672a\u6388\u4e88\u4efb\u4f55\u79df\u7ea6&#xff0c;\u6216\u6240\u6709\u627f\u79df\u4eba\u90fd\u5df2\u9500\u6bc1&#xff0c;\u5219\u6b64\u5217\u8868\u4e3a\u7a7a\u3002\u7531\u4e8e lessor \u88ab\u5176\u6240\u6709\u627f\u79df\u4eba\u5f15\u7528&#xff0c;\u6b64 master \u65e0\u6cd5\u88ab\u9500\u6bc1&#xff0c;\u9664\u975e\u5217\u8868\u4e3a\u7a7a\u3002<\/li>\n<li>leases \u2014 \u79df\u8d41\u7ed9\u6b64 drm_master \u7684\u5bf9\u8c61\u3002\u53d7 drm_device.mode_config \u7684 drm_mode_config.idr_mutex \u4fdd\u62a4\u3002<br \/>\n\u5bf9\u8c61\u5728 drm_lease_create() \u4e2d\u4e00\u6b21\u6027\u5168\u90e8\u79df\u8d41&#xff0c;\u5728\u79df\u7ea6\u88ab\u64a4\u9500\u65f6\u4e00\u6b21\u6027\u5168\u90e8\u79fb\u9664\u3002<\/li>\n<li>lessee_idr \u2014 \u6b64\u6240\u6709\u8005\u4e0b\u7684\u6240\u6709\u627f\u79df\u4eba&#xff08;\u4ec5\u5728 lessor \u4e3a NULL \u65f6\u4f7f\u7528&#xff09;\u3002\u53d7 drm_device.mode_config \u7684 drm_mode_config.idr_mutex \u4fdd\u62a4\u3002<\/li>\n<\/ul>\n<p>\u63cf\u8ff0<\/p>\n<p>\u6ce8\u610f master \u7ed3\u6784\u4f53\u4ec5\u4e0e\u4f20\u7edf\/\u4e3b\u8bbe\u5907\u8282\u70b9\u76f8\u5173&#xff0c;\u56e0\u6b64\u6bcf\u4e2a\u8bbe\u5907\u53ea\u80fd\u6709\u4e00\u4e2a&#xff0c;\u800c\u4e0d\u662f\u6bcf\u4e2a drm_minor \u4e00\u4e2a\u3002<\/p>\n<hr \/>\n<h3>DRM \u663e\u793a\u8d44\u6e90\u79df\u7ea6&#xff08;DRM Display Resource Leasing&#xff09;<\/h3>\n<p>DRM \u79df\u7ea6&#xff08;leases&#xff09;\u63d0\u4f9b\u4e86\u6709\u5173 DRM master \u662f\u5426\u53ef\u4ee5\u63a7\u5236 DRM \u6a21\u5f0f\u8bbe\u7f6e\u5bf9\u8c61\u7684\u4fe1\u606f\u3002\u8fd9\u4f7f\u5f97\u53ef\u4ee5\u521b\u5efa\u591a\u4e2a DRM master \u6765\u7ba1\u7406\u663e\u793a\u8d44\u6e90\u7684\u5b50\u96c6\u3002<\/p>\n<p>\u8bbe\u5907\u7684\u539f\u59cb DRM master &#034;\u62e5\u6709&#034;\u53ef\u7528\u7684 drm \u8d44\u6e90\u3002\u5b83\u53ef\u4ee5\u521b\u5efa\u989d\u5916\u7684 DRM master&#xff0c;\u5e76\u5c06\u5176\u63a7\u5236\u7684\u8d44\u6e90&#034;\u79df\u8d41&#034;\u7ed9\u65b0\u7684 DRM master\u3002\u8fd9\u4f7f\u65b0\u7684 DRM master \u83b7\u5f97\u5bf9\u88ab\u79df\u8d41\u8d44\u6e90\u7684\u63a7\u5236\u6743&#xff0c;\u76f4\u5230\u6240\u6709\u8005\u64a4\u9500\u79df\u7ea6\u6216\u65b0\u7684 DRM master \u88ab\u5173\u95ed\u3002<\/p>\n<p>\u4e00\u4e9b\u6709\u7528\u7684\u672f\u8bed&#xff1a;<\/p>\n<ul>\n<li>\u2018\u6240\u6709\u8005\u2019&#xff08;owner&#xff09; \u662f\u4e0d\u4ece\u53e6\u4e00\u4e2a struct drm_master \u79df\u8d41\u5bf9\u8c61\u7684 struct drm_master&#xff0c;\u56e0\u6b64&#034;\u62e5\u6709&#034;\u8fd9\u4e9b\u5bf9\u8c61\u3002\u6240\u6709\u8005\u53ef\u4ee5\u88ab\u8bc6\u522b\u4e3a drm_master.lessor \u4e3a NULL \u7684 struct drm_master\u3002<\/li>\n<li>\u2018\u51fa\u79df\u8005\u2019&#xff08;lessor&#xff09; \u662f\u5c06\u5bf9\u8c61\u79df\u8d41\u7ed9\u4e00\u4e2a\u6216\u591a\u4e2a\u5176\u4ed6 struct drm_master \u7684 struct drm_master\u3002\u76ee\u524d&#xff0c;\u627f\u79df\u4eba\u4e0d\u5141\u8bb8\u521b\u5efa\u5b50\u79df\u7ea6&#xff0c;\u56e0\u6b64\u51fa\u79df\u8005\u4e0e\u6240\u6709\u8005\u76f8\u540c\u3002<\/li>\n<li>\u2018\u627f\u79df\u4eba\u2019&#xff08;lessee&#xff09; \u662f\u4ece\u67d0\u4e2a\u5176\u4ed6 struct drm_master \u79df\u8d41\u5bf9\u8c61\u7684 struct drm_master\u3002\u6bcf\u4e2a\u627f\u79df\u4eba\u4ec5\u4ece\u4e00\u4e2a\u8bb0\u5f55\u5728 drm_master.lessor \u4e2d\u7684\u51fa\u79df\u8005\u79df\u8d41\u8d44\u6e90&#xff0c;\u5e76\u5c06\u5176\u79df\u8d41\u7684\u5bf9\u8c61\u96c6\u5408\u4fdd\u5b58\u5728 drm_master.leases \u4e2d\u3002<\/li>\n<li>\u2018\u79df\u7ea6\u2019&#xff08;lease&#xff09; \u662f\u51fa\u79df\u8005\u548c\u627f\u79df\u4eba\u4e4b\u95f4\u7684\u5408\u540c&#xff0c;\u6807\u8bc6\u627f\u79df\u4eba\u53ef\u4ee5\u63a7\u5236\u54ea\u4e9b\u8d44\u6e90\u3002\u6240\u6709\u88ab\u79df\u8d41\u7684\u8d44\u6e90\u5fc5\u987b\u7531\u51fa\u79df\u8005\u62e5\u6709\u6216\u79df\u8d41\u7ed9\u51fa\u79df\u8005&#xff0c;\u4e14\u51fa\u79df\u8005\u4e0d\u5141\u8bb8\u5c06\u540c\u4e00\u5bf9\u8c61\u79df\u8d41\u7ed9\u591a\u4e2a\u627f\u79df\u4eba\u3002<\/li>\n<\/ul>\n<p>\u4efb\u4f55 struct drm_master \u201c\u63a7\u5236&#034;\u7684\u5bf9\u8c61\u96c6\u5408\u4ec5\u9650\u4e8e\u5176\u79df\u8d41\u7684\u5bf9\u8c61\u96c6&#xff08;\u5bf9\u4e8e\u627f\u79df\u4eba&#xff09;\u6216\u6240\u6709\u5bf9\u8c61&#xff08;\u5bf9\u4e8e\u6240\u6709\u8005&#xff09;\u3002\u672a\u88ab struct drm_master \u63a7\u5236\u7684\u5bf9\u8c61\u4e0d\u80fd\u901a\u8fc7\u5404\u79cd\u72b6\u6001\u64cd\u4f5c ioctl \u8fdb\u884c\u4fee\u6539&#xff0c;\u62a5\u544a\u7ed9\u7528\u6237\u6001\u7684\u4efb\u4f55\u72b6\u6001\u90fd\u5c06\u88ab\u7f16\u8f91\u4ee5\u4f7f\u5176\u770b\u8d77\u6765\u7a7a\u95f2\u548c\/\u6216\u4e0d\u53ef\u7528\u3002\u4f8b\u5982&#xff0c;\u8fde\u63a5\u5668&#xff08;connector&#xff09;\u59cb\u7ec8\u62a5\u544a&#034;\u5df2\u65ad\u5f00\u201d&#xff0c;\u800c\u7f16\u7801\u5668&#xff08;encoder&#xff09;\u62a5\u544a\u6ca1\u6709\u53ef\u80fd\u7684 crtc \u6216\u514b\u9686\u3002<\/p>\n<p>\u7531\u4e8e\u6bcf\u4e2a\u627f\u79df\u4eba\u4ec5\u4ece\u4e00\u4e2a\u51fa\u79df\u8005\u79df\u8d41\u5bf9\u8c61&#xff0c;\u663e\u793a\u8d44\u6e90\u79df\u7ea6\u5f62\u6210\u4e00\u4e2a struct drm_master \u6811\u3002\u7531\u4e8e\u627f\u79df\u4eba\u76ee\u524d\u4e0d\u5141\u8bb8\u521b\u5efa\u5b50\u79df\u7ea6&#xff0c;\u6811\u6df1\u5ea6\u9650\u5236\u4e3a 1\u3002\u5f53\u9876\u7ea7\u8bbe\u5907\u6240\u6709\u8005\u901a\u8fc7 SETMASTER \u6216 DROPMASTER IOCTL \u53d8\u66f4\u65f6&#xff0c;\u6240\u6709\u8fd9\u4e9b\u5c06\u540c\u65f6\u6fc0\u6d3b&#xff0c;\u56e0\u6b64 drm_device.master \u6307\u5411\u79df\u7ea6\u6811\u9876\u90e8\u7684\u6240\u6709\u8005&#xff08;\u5373 drm_master.lessor \u4e3a NULL \u7684 struct drm_master&#xff09;\u3002\u4ece\u6240\u6709\u8005\u79df\u8d41\u5bf9\u8c61\u7684\u627f\u79df\u4eba\u5b8c\u6574\u5217\u8868\u53ef\u4ee5\u901a\u8fc7\u6240\u6709\u8005\u7684 drm_master.lessee_idr \u641c\u7d22\u3002<\/p>\n<hr \/>\n<h3>\u5f00\u6e90\u7528\u6237\u6001\u8981\u6c42&#xff08;Open-Source Userspace Requirements&#xff09;<\/h3>\n<p>DRM \u5b50\u7cfb\u7edf\u5bf9\u65b0 uAPI \u7684\u7528\u6237\u6001\u4fa7\u6709\u6bd4\u5927\u591a\u6570\u5176\u4ed6\u5185\u6838\u5b50\u7cfb\u7edf\u66f4\u4e25\u683c\u7684\u8981\u6c42\u3002\u672c\u8282\u89e3\u91ca\u8fd9\u4e9b\u8981\u6c42\u7684\u5177\u4f53\u5185\u5bb9\u4ee5\u53ca\u5b83\u4eec\u5b58\u5728\u7684\u539f\u56e0\u3002<\/p>\n<p>\u7b80\u800c\u8a00\u4e4b&#xff1a;\u4efb\u4f55 DRM uAPI \u7684\u6dfb\u52a0\u90fd\u9700\u8981\u76f8\u5e94\u7684\u5f00\u6e90\u7528\u6237\u6001\u8865\u4e01&#xff0c;\u4e14\u8fd9\u4e9b\u8865\u4e01\u5fc5\u987b\u7ecf\u8fc7\u5ba1\u67e5\u5e76\u51c6\u5907\u597d\u5408\u5e76\u5230\u5408\u9002\u7684\u3001\u89c4\u8303\u7684\u4e0a\u6e38\u9879\u76ee\u4e2d\u3002<\/p>\n<p>GFX \u8bbe\u5907&#xff08;\u5305\u62ec\u663e\u793a\u548c\u6e32\u67d3\/GPU \u4fa7&#xff09;\u662f\u975e\u5e38\u590d\u6742\u7684\u786c\u4ef6&#xff0c;\u7528\u6237\u6001\u548c\u5185\u6838\u5fc5\u987b\u975e\u5e38\u7d27\u5bc6\u5730\u534f\u4f5c\u3002\u6e32\u67d3\u548c\u6a21\u5f0f\u8bbe\u7f6e\u7684\u63a5\u53e3\u5fc5\u987b\u6781\u5176\u5bbd\u6cdb\u548c\u7075\u6d3b&#xff0c;\u56e0\u6b64\u51e0\u4e4e\u4e0d\u53ef\u80fd\u4e3a\u6bcf\u4e2a\u53ef\u80fd\u7684\u8fb9\u7f18\u60c5\u51b5\u7cbe\u786e\u5b9a\u4e49\u5b83\u4eec\u3002\u8fd9\u53cd\u8fc7\u6765\u4f7f\u5f97\u5728\u5b9e\u8df5\u4e2d\u51e0\u4e4e\u4e0d\u53ef\u80fd\u533a\u5206\u7528\u6237\u6001\u6240\u9700\u7684\u884c\u4e3a&#xff08;\u4e0d\u80fd\u66f4\u6539\u4ee5\u907f\u514d\u56de\u5f52&#xff09;\u548c\u4ec5\u662f\u5f53\u524d\u5b9e\u73b0\u7684\u5076\u7136\u4ea7\u7269\u7684\u884c\u4e3a\u3002<\/p>\n<p>\u5982\u679c\u6ca1\u6709\u6240\u6709\u7528\u6237\u6001\u4f7f\u7528\u8005\u7684\u5b8c\u6574\u6e90\u4ee3\u7801\u8bbf\u95ee\u6743&#xff0c;\u5c31\u65e0\u6cd5\u66f4\u6539\u5b9e\u73b0\u7ec6\u8282&#xff0c;\u56e0\u4e3a\u7528\u6237\u6001\u53ef\u80fd\u5728\u7ec6\u5fae\u4e4b\u5904\u4f9d\u8d56\u5f53\u524d\u5b9e\u73b0\u7684\u5076\u7136\u884c\u4e3a\u3002\u800c\u5728\u6ca1\u6709\u6e90\u4ee3\u7801\u7684\u60c5\u51b5\u4e0b\u8c03\u8bd5\u8fd9\u79cd\u56de\u5f52\u51e0\u4e4e\u662f\u4e0d\u53ef\u80fd\u7684\u3002<\/p>\n<p>\u56e0\u6b64\u8fd9\u610f\u5473\u7740&#xff1a;<\/p>\n<ul>\n<li>Linux \u5185\u6838\u7684&#034;\u65e0\u56de\u5f52&#034;\u7b56\u7565\u5b9e\u9645\u4e0a\u4ec5\u9002\u7528\u4e8e DRM \u5b50\u7cfb\u7edf\u7684\u5f00\u6e90\u7528\u6237\u6001\u3002 DRM \u5f00\u53d1\u8005\u5b8c\u5168\u53ef\u4ee5\u63a5\u53d7\u95ed\u6e90 blob \u9a71\u52a8\u5728\u7528\u6237\u6001\u4f7f\u7528\u4e0e\u5f00\u6e90\u9a71\u52a8\u76f8\u540c\u7684 uAPI&#xff0c;\u4f46\u5b83\u4eec\u5fc5\u987b\u4ee5\u4e0e\u5f00\u6e90\u9a71\u52a8\u5b8c\u5168\u76f8\u540c\u7684\u65b9\u5f0f\u4f7f\u7528\u3002\u521b\u9020\u6027\u5730&#xff08;\u6ee5\u7528&#xff09;\u4f7f\u7528\u63a5\u53e3\u5c06\u4f1a\u5bfc\u81f4\u7834\u574f\u2014\u2014\u8fc7\u53bb\u4e5f\u7ecf\u5e38\u5982\u6b64\u3002<\/li>\n<li>\u4efb\u4f55\u65b0\u7684\u7528\u6237\u6001\u63a5\u53e3\u90fd\u5fc5\u987b\u6709\u5f00\u6e90\u5b9e\u73b0\u4f5c\u4e3a\u793a\u8303\u8f7d\u4f53\u3002<\/li>\n<\/ul>\n<p>\u8981\u6c42\u5f00\u6e90\u7528\u6237\u6001\u7684\u53e6\u4e00\u4e2a\u539f\u56e0\u662f uAPI \u5ba1\u67e5\u3002\u7531\u4e8e GFX \u6808\u7684\u5185\u6838\u548c\u7528\u6237\u6001\u90e8\u5206\u5fc5\u987b\u5982\u6b64\u7d27\u5bc6\u5730\u534f\u4f5c&#xff0c;\u4ee3\u7801\u5ba1\u67e5\u53ea\u6709\u5728\u540c\u65f6\u67e5\u770b\u4e24\u4fa7\u7684\u60c5\u51b5\u4e0b\u624d\u80fd\u8bc4\u4f30\u65b0\u63a5\u53e3\u662f\u5426\u8fbe\u5230\u5176\u76ee\u6807\u3002<\/p>\n<p>\u4e3a\u786e\u4fdd\u63a5\u53e3\u786e\u5b9e\u5b8c\u6574\u8986\u76d6\u7528\u4f8b&#xff0c;\u8fd8\u9700\u8981\u6ee1\u8db3\u4ee5\u4e0b\u9644\u52a0\u8981\u6c42&#xff1a;<\/p>\n<ul>\n<li>\u5f00\u6e90\u7528\u6237\u6001\u4e0d\u80fd\u662f\u73a9\u5177\/\u6d4b\u8bd5\u5e94\u7528\u7a0b\u5e8f&#xff0c;\u800c\u5fc5\u987b\u662f\u771f\u5b9e\u7684\u4e1c\u897f\u3002\u5177\u4f53\u6765\u8bf4&#xff0c;\u5b83\u9700\u8981\u5904\u7406\u6240\u6709\u5e38\u89c1\u7684\u9519\u8bef\u548c\u8fb9\u7f18\u60c5\u51b5\u3002\u8fd9\u4e9b\u5f80\u5f80\u662f\u65b0 uAPI \u51fa\u95ee\u9898\u7684\u5730\u65b9&#xff0c;\u56e0\u6b64\u5bf9\u4e8e\u8bc4\u4f30\u6240\u63d0\u8bae\u63a5\u53e3\u7684\u9002\u7528\u6027\u81f3\u5173\u91cd\u8981\u3002<\/li>\n<li>\u7528\u6237\u6001\u4fa7\u5fc5\u987b\u5b8c\u5168\u6309\u7167\u8be5\u7528\u6237\u6001\u9879\u76ee\u7684\u6807\u51c6\u8fdb\u884c\u5ba1\u67e5\u548c\u6d4b\u8bd5\u3002\u4f8b\u5982 mesa \u8fd9\u610f\u5473\u7740 piglit \u6d4b\u8bd5\u7528\u4f8b\u548c\u90ae\u4ef6\u5217\u8868\u4e0a\u7684\u5ba1\u67e5\u3002\u8fd9\u540c\u6837\u662f\u4e3a\u4e86\u786e\u4fdd\u65b0\u63a5\u53e3\u786e\u5b9e\u80fd\u5b8c\u6210\u4efb\u52a1\u3002<\/li>\n<li>\u7528\u6237\u6001\u4fa7\u7684\u5ba1\u67e5\u8005\u4e5f\u5e94\u5728\u5185\u6838 uAPI \u8865\u4e01\u4e0a\u63d0\u4f9b Acked-by&#xff0c;\u8868\u660e\u4ed6\u4eec\u8ba4\u4e3a\u6240\u63d0\u8bae\u7684 uAPI \u662f\u5408\u7406\u7684&#xff0c;\u5e76\u4e14\u6709\u5145\u5206\u7684\u6587\u6863\u548c\u9a8c\u8bc1\u4f9b\u7528\u6237\u6001\u4f7f\u7528\u3002<\/li>\n<li>\u7528\u6237\u6001\u8865\u4e01\u5fc5\u987b\u9488\u5bf9\u89c4\u8303\u7684\u4e0a\u6e38\u9879\u76ee&#xff0c;\u800c\u975e\u67d0\u4e2a\u5382\u5546\u7684\u5206\u652f\u3002\u8fd9\u662f\u4e3a\u4e86\u786e\u4fdd\u6ca1\u6709\u4eba\u901a\u8fc7\u5feb\u901f\u5206\u652f\u6765\u89c4\u907f\u5ba1\u67e5\u548c\u6d4b\u8bd5\u8981\u6c42\u3002<\/li>\n<li>\u5185\u6838\u8865\u4e01\u53ea\u80fd\u5728\u6ee1\u8db3\u6240\u6709\u4e0a\u8ff0\u8981\u6c42\u540e\u5408\u5e76&#xff0c;\u4f46\u5fc5\u987b\u5728\u7528\u6237\u6001\u8865\u4e01\u843d\u5730\u4e4b\u524d\u5408\u5e76\u5230 drm-next \u6216 drm-misc-next\u3002uAPI \u59cb\u7ec8\u4ece\u5185\u6838\u6d41\u51fa&#xff0c;\u53cd\u5176\u9053\u800c\u884c\u4e4b\u6709 uAPI \u5b9a\u4e49\u548c\u5934\u6587\u4ef6\u53d1\u6563\u7684\u98ce\u9669\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u4e9b\u662f\u76f8\u5f53\u9ad8\u7684\u8981\u6c42&#xff0c;\u4f46\u5b83\u4eec\u6e90\u4e8e\u591a\u5e74\u6765\u7684\u5171\u540c\u75db\u82e6\u548c\u7ecf\u9a8c\u2014\u2014\u4ed3\u4fc3\u6dfb\u52a0\u7684 uAPI \u51e0\u4e4e\u603b\u662f\u5f88\u5feb\u5c31\u88ab\u540e\u6094\u3002GFX \u8bbe\u5907\u53d8\u5316\u975e\u5e38\u5feb&#xff0c;\u81f3\u5c11\u6bcf\u9694\u51e0\u5e74\u5c31\u9700\u8981\u4e00\u6b21\u8303\u5f0f\u8f6c\u53d8\u548c\u5168\u65b0\u7684 uAPI \u63a5\u53e3\u96c6\u5408\u3002\u518d\u52a0\u4e0a Linux \u5185\u6838\u4fdd\u8bc1\u73b0\u6709\u7528\u6237\u6001\u8fd0\u884c 10 \u5e74\u4ee5\u4e0a\u7684\u627f\u8bfa&#xff0c;\u8fd9\u5bf9 DRM \u5b50\u7cfb\u7edf\u6765\u8bf4\u5df2\u7ecf\u76f8\u5f53\u75db\u82e6\u4e86\u2014\u2014\u540c\u4e00\u529f\u80fd\u6709\u591a\u4e2a\u4e0d\u540c\u7684 uAPI \u5e76\u5b58\u3002\u5982\u679c\u6211\u4eec\u6bcf\u5e74\u518d\u5f80\u91cc\u9762\u6dfb\u51e0\u4e2a\u5f7b\u5e95\u7684\u9519\u8bef&#xff0c;\u90a3\u5c06\u5b8c\u5168\u65e0\u6cd5\u7ba1\u7406\u3002<\/p>\n<hr \/>\n<h3>\u6e32\u67d3\u8282\u70b9&#xff08;Render nodes&#xff09;<\/h3>\n<p>DRM \u6838\u5fc3\u4e3a\u7528\u6237\u6001\u63d0\u4f9b\u591a\u4e2a\u5b57\u7b26\u8bbe\u5907\u3002\u6839\u636e\u6253\u5f00\u7684\u8bbe\u5907\u4e0d\u540c&#xff0c;\u7528\u6237\u6001\u53ef\u4ee5\u6267\u884c\u4e0d\u540c\u7684\u64cd\u4f5c\u96c6\u5408&#xff08;\u4e3b\u8981\u662f ioctl&#xff09;\u3002<\/p>\n<p>\u4e3b\u8282\u70b9&#xff08;primary node&#xff09;\u59cb\u7ec8\u521b\u5efa&#xff0c;\u540d\u4e3a card\u3002\u6b64\u5916&#xff0c;\u8fd8\u4f1a\u521b\u5efa\u4e00\u4e2a\u5f53\u524d\u672a\u4f7f\u7528\u7684\u63a7\u5236\u8282\u70b9&#xff0c;\u540d\u4e3a controlD\u3002\u4e3b\u8282\u70b9\u63d0\u4f9b\u6240\u6709\u4f20\u7edf\u64cd\u4f5c&#xff0c;\u5386\u53f2\u4e0a\u662f\u7528\u6237\u6001\u4f7f\u7528\u7684\u552f\u4e00\u63a5\u53e3\u3002\u968f\u7740 KMS \u7684\u5f15\u5165&#xff0c;\u63a7\u5236\u8282\u70b9\u88ab\u521b\u5efa\u3002\u7136\u800c&#xff0c;\u8ba1\u5212\u4e2d\u7684 KMS \u63a7\u5236\u63a5\u53e3\u4ece\u672a\u88ab\u7f16\u5199&#xff0c;\u56e0\u6b64\u63a7\u5236\u8282\u70b9\u81f3\u4eca\u4ecd\u672a\u88ab\u4f7f\u7528\u3002<\/p>\n<p>\u968f\u7740\u79bb\u5c4f\u6e32\u67d3\u5668\u548c GPGPU \u5e94\u7528\u7684\u65e5\u76ca\u589e\u591a&#xff0c;\u5ba2\u6237\u7aef\u4e0d\u518d\u9700\u8981\u8fd0\u884c\u5408\u6210\u5668\u6216\u56fe\u5f62\u670d\u52a1\u5668\u5c31\u80fd\u4f7f\u7528 GPU\u3002\u4f46 DRM API \u8981\u6c42\u975e\u7279\u6743\u5ba2\u6237\u7aef\u5148\u5411 DRM-Master \u8ba4\u8bc1\u624d\u80fd\u83b7\u5f97 GPU \u8bbf\u95ee\u6743\u3002\u4e3a\u907f\u514d\u6b64\u6b65\u9aa4\u5e76\u5728\u4e0d\u8ba4\u8bc1\u7684\u60c5\u51b5\u4e0b\u6388\u4e88\u5ba2\u6237\u7aef GPU \u8bbf\u95ee\u6743&#xff0c;\u6e32\u67d3\u8282\u70b9&#xff08;render nodes&#xff09;\u88ab\u5f15\u5165\u3002<\/p>\n<p>\u6e32\u67d3\u8282\u70b9\u4ec5\u670d\u52a1\u4e8e\u6e32\u67d3\u5ba2\u6237\u7aef&#xff0c;\u5373\u4e0d\u80fd\u5728\u6e32\u67d3\u8282\u70b9\u4e0a\u53d1\u51fa\u6a21\u5f0f\u8bbe\u7f6e\u6216\u7279\u6743 ioctl\u3002\u53ea\u5141\u8bb8\u975e\u5168\u5c40\u6e32\u67d3\u547d\u4ee4\u3002<\/p>\n<p>\u5982\u679c\u9a71\u52a8\u652f\u6301\u6e32\u67d3\u8282\u70b9&#xff0c;\u5b83\u5fc5\u987b\u901a\u8fc7 DRIVER_RENDER DRM \u9a71\u52a8\u80fd\u529b\u8fdb\u884c\u58f0\u660e\u3002\u5982\u679c\u4e0d\u652f\u6301&#xff0c;\u5219\u4e3b\u8282\u70b9\u5fc5\u987b\u4e0e\u4f20\u7edf drmAuth \u8ba4\u8bc1\u6d41\u7a0b\u4e00\u8d77\u7528\u4e8e\u6e32\u67d3\u5ba2\u6237\u7aef\u3002<\/p>\n<p>\u5982\u679c\u9a71\u52a8\u58f0\u660e\u652f\u6301\u6e32\u67d3\u8282\u70b9&#xff0c;DRM \u6838\u5fc3\u5c06\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a renderD \u7684\u72ec\u7acb\u6e32\u67d3\u8282\u70b9\u3002\u6bcf\u4e2a\u8bbe\u5907\u6709\u4e00\u4e2a\u6e32\u67d3\u8282\u70b9\u3002\u8be5\u8282\u70b9\u4e0a\u9664\u4e86\u4e0e PRIME \u76f8\u5173\u7684 ioctl \u5916\u4e0d\u5141\u8bb8\u4efb\u4f55 ioctl\u3002\u7279\u522b\u662f GEM_OPEN \u5c06\u88ab\u660e\u786e\u7981\u6b62\u3002\u6709\u5173\u53ef\u5728\u6e32\u67d3\u8282\u70b9\u4e0a\u4f7f\u7528\u7684\u9a71\u52a8\u65e0\u5173 ioctl \u7684\u5b8c\u6574\u5217\u8868&#xff0c;\u8bf7\u53c2\u89c1 drm_ioctl.c \u4e2d\u6807\u8bb0\u4e3a DRM_RENDER_ALLOW \u7684 ioctl\u3002<\/p>\n<p>\u6e32\u67d3\u8282\u70b9\u7684\u8bbe\u8ba1\u76ee\u7684\u662f\u907f\u514d\u7f13\u51b2\u533a\u6cc4\u6f0f\u2014\u2014\u5982\u679c\u5ba2\u6237\u7aef\u731c\u6d4b flink \u540d\u79f0\u6216\u4f20\u7edf\u63a5\u53e3\u4e0a\u7684 mmap \u504f\u79fb\u91cf&#xff0c;\u5c31\u4f1a\u53d1\u751f\u7f13\u51b2\u533a\u6cc4\u6f0f\u3002\u9664\u4e86\u8fd9\u4e2a\u57fa\u672c\u63a5\u53e3\u5916&#xff0c;\u9a71\u52a8\u8fd8\u5fc5\u987b\u5c06\u5176\u9a71\u52a8\u76f8\u5173\u7684\u7eaf\u6e32\u67d3 ioctl \u6807\u8bb0\u4e3a DRM_RENDER_ALLOW&#xff0c;\u4ee5\u4fbf\u6e32\u67d3\u5ba2\u6237\u7aef\u53ef\u4ee5\u4f7f\u7528\u5b83\u4eec\u3002\u9a71\u52a8\u4f5c\u8005\u5fc5\u987b\u5c0f\u5fc3\u4e0d\u8981\u5728\u6e32\u67d3\u8282\u70b9\u4e0a\u5141\u8bb8\u4efb\u4f55\u7279\u6743 ioctl\u3002<\/p>\n<p>\u6709\u4e86\u6e32\u67d3\u8282\u70b9&#xff0c;\u7528\u6237\u6001\u73b0\u5728\u53ef\u4ee5\u901a\u8fc7\u57fa\u672c\u7684\u6587\u4ef6\u7cfb\u7edf\u8bbf\u95ee\u6a21\u5f0f\u6765\u63a7\u5236\u6e32\u67d3\u8282\u70b9\u7684\u8bbf\u95ee\u3002\u4e0d\u518d\u9700\u8981\u5728\u7279\u6743\u4e3b\/\u4f20\u7edf\u8282\u70b9\u4e0a\u8ba4\u8bc1\u5ba2\u6237\u7aef\u7684\u8fd0\u884c\u4e2d\u7684\u56fe\u5f62\u670d\u52a1\u5668\u3002\u76f8\u53cd&#xff0c;\u5ba2\u6237\u7aef\u53ef\u4ee5\u6253\u5f00\u6e32\u67d3\u8282\u70b9\u5e76\u7acb\u5373\u83b7\u5f97 GPU \u8bbf\u95ee\u6743\u3002\u5ba2\u6237\u7aef&#xff08;\u6216\u670d\u52a1\u5668&#xff09;\u4e4b\u95f4\u7684\u901a\u4fe1\u901a\u8fc7 PRIME \u5b8c\u6210\u3002\u4ece\u6e32\u67d3\u8282\u70b9\u5230\u4f20\u7edf\u8282\u70b9\u7684 FLINK \u4e0d\u53d7\u652f\u6301\u3002\u65b0\u5ba2\u6237\u7aef\u4e0d\u5e94\u4f7f\u7528\u4e0d\u5b89\u5168\u7684 FLINK \u63a5\u53e3\u3002<\/p>\n<p>\u9664\u4e86\u4e22\u5f03\u6240\u6709\u6a21\u5f0f\u8bbe\u7f6e\/\u5168\u5c40 ioctl \u5916&#xff0c;\u6e32\u67d3\u8282\u70b9\u8fd8\u4e22\u5f03\u4e86 DRM-Master \u6982\u5ff5\u3002\u6ca1\u6709\u7406\u7531\u5c06\u6e32\u67d3\u5ba2\u6237\u7aef\u4e0e DRM-Master \u5173\u8054&#xff0c;\u56e0\u4e3a\u5b83\u4eec\u72ec\u7acb\u4e8e\u4efb\u4f55\u56fe\u5f62\u670d\u52a1\u5668\u3002\u800c\u4e14&#xff0c;\u5b83\u4eec\u65e0\u8bba\u5982\u4f55\u90fd\u5fc5\u987b\u5728\u6ca1\u6709\u4efb\u4f55\u8fd0\u884c\u4e2d\u7684 master \u7684\u60c5\u51b5\u4e0b\u5de5\u4f5c\u3002\u5982\u679c\u9a71\u52a8\u652f\u6301\u6e32\u67d3\u8282\u70b9&#xff0c;\u5b83\u4eec\u5fc5\u987b\u80fd\u591f\u5728\u6ca1\u6709 master \u5bf9\u8c61\u7684\u60c5\u51b5\u4e0b\u8fd0\u884c\u3002\u53e6\u4e00\u65b9\u9762&#xff0c;\u5982\u679c\u9a71\u52a8\u9700\u8981\u5728\u5ba2\u6237\u7aef\u4e4b\u95f4\u5171\u4eab\u5bf9\u7528\u6237\u6001\u53ef\u89c1\u4e14\u53ef\u8de8\u6253\u5f00\u6587\u4ef6\u8fb9\u754c\u8bbf\u95ee\u7684\u72b6\u6001&#xff0c;\u5219\u5b83\u4eec\u4e0d\u80fd\u652f\u6301\u6e32\u67d3\u8282\u70b9\u3002<\/p>\n<hr \/>\n<h3>\u8bbe\u5907\u70ed\u62d4\u63d2&#xff08;Device Hot-Unplug&#xff09;<\/h3>\n<p>\u6ce8\u610f<br \/>\n\u4ee5\u4e0b\u662f\u8ba1\u5212\u3002\u5b9e\u73b0\u5c1a\u672a\u5b8c\u6210&#xff08;2020 \u5e74 5 \u6708&#xff09;\u3002<\/p>\n<p>\u56fe\u5f62\u8bbe\u5907&#xff08;\u663e\u793a\u548c\/\u6216\u6e32\u67d3&#xff09;\u53ef\u80fd\u901a\u8fc7 USB&#xff08;\u4f8b\u5982\u663e\u793a\u9002\u914d\u5668\u6216\u6269\u5c55\u575e&#xff09;\u6216 Thunderbolt&#xff08;\u4f8b\u5982 eGPU&#xff09;\u8fde\u63a5\u3002\u6700\u7ec8\u7528\u6237\u53ef\u4ee5\u5728\u8fd9\u4e9b\u8bbe\u5907\u4f7f\u7528\u8fc7\u7a0b\u4e2d\u70ed\u62d4\u63d2\u5b83\u4eec&#xff0c;\u5e76\u671f\u671b\u81f3\u5c11\u673a\u5668\u4e0d\u4f1a\u5d29\u6e83\u3002\u70ed\u62d4\u63d2 DRM \u8bbe\u5907\u9020\u6210\u7684\u4efb\u4f55\u635f\u5bb3\u9700\u8981\u5c3d\u53ef\u80fd\u9650\u5236&#xff0c;\u5e76\u4e14\u5fc5\u987b\u7ed9\u7528\u6237\u6001\u673a\u4f1a\u6765\u5904\u7406&#xff08;\u5982\u679c\u5b83\u613f\u610f\u7684\u8bdd&#xff09;\u3002<\/p>\n<p>\u7406\u60f3\u60c5\u51b5\u4e0b&#xff0c;\u62d4\u6389 DRM \u8bbe\u5907\u4ecd\u80fd\u8ba9\u684c\u9762\u7ee7\u7eed\u8fd0\u884c&#xff0c;\u4f46\u8fd9\u9700\u8981\u6574\u4e2a\u56fe\u5f62\u6808\u7684\u663e\u5f0f\u652f\u6301&#xff1a;\u4ece\u5185\u6838\u548c\u7528\u6237\u6001\u9a71\u52a8&#xff0c;\u5230\u663e\u793a\u670d\u52a1\u5668&#xff0c;\u901a\u8fc7\u7a97\u53e3\u7cfb\u7edf\u534f\u8bae&#xff0c;\u518d\u5230\u5e94\u7528\u7a0b\u5e8f\u548c\u5e93\u3002<\/p>\n<p>\u5176\u4ed6\u5e94\u5bfc\u81f4\u76f8\u540c\u7ed3\u679c\u7684\u573a\u666f\u5305\u62ec&#xff1a;\u4e0d\u53ef\u6062\u590d\u7684 GPU \u5d29\u6e83\u3001PCI \u8bbe\u5907\u4ece\u603b\u7ebf\u4e0a\u6d88\u5931&#xff0c;\u6216\u5f3a\u5236\u4ece\u7269\u7406\u8bbe\u5907\u89e3\u7ed1\u9a71\u52a8\u3002<\/p>\n<p>\u6362\u8a00\u4e4b&#xff0c;\u4ece\u7528\u6237\u6001\u7684\u89d2\u5ea6\u6765\u770b&#xff0c;\u4e00\u5207\u90fd\u9700\u8981\u7ee7\u7eed\u6216\u591a\u6216\u5c11\u6b63\u5e38\u5de5\u4f5c&#xff0c;\u76f4\u5230\u7528\u6237\u6001\u505c\u6b62\u4f7f\u7528\u6d88\u5931\u7684 DRM \u8bbe\u5907\u5e76\u5b8c\u5168\u5173\u95ed\u5b83\u3002<\/p>\n<p>\u7528\u6237\u6001\u5c06\u4ece\u8bbe\u5907\u79fb\u9664 uevent\u3001ioctl \u8fd4\u56de ENODEV&#xff08;\u6216\u9a71\u52a8\u7279\u5b9a\u7684 ioctl \u8fd4\u56de\u9a71\u52a8\u7279\u5b9a\u7684\u503c&#xff09;&#xff0c;\u6216 open() \u8fd4\u56de ENXIO \u5f97\u77e5\u8bbe\u5907\u6d88\u5931\u3002\u53ea\u6709\u5728\u7528\u6237\u6001\u5173\u95ed\u4e86\u6240\u6709\u76f8\u5173\u7684 DRM \u8bbe\u5907\u548c dmabuf \u6587\u4ef6\u63cf\u8ff0\u7b26\u5e76\u79fb\u9664\u4e86\u6240\u6709 mmap \u4e4b\u540e&#xff0c;DRM \u9a71\u52a8\u624d\u80fd\u62c6\u9664\u5176\u4e0d\u518d\u5b58\u5728\u7684\u8bbe\u5907\u5b9e\u4f8b\u3002\u5982\u679c\u540c\u4e00\u7269\u7406\u8bbe\u5907\u5728\u6b64\u671f\u95f4\u4ee5\u67d0\u79cd\u65b9\u5f0f\u91cd\u65b0\u51fa\u73b0&#xff0c;\u5b83\u5e94\u4f5c\u4e3a\u4e00\u4e2a\u65b0\u7684 DRM \u8bbe\u5907\u3002\u4e0e PID \u7c7b\u4f3c&#xff0c;\u5b57\u7b26\u8bbe\u5907\u6b21\u8bbe\u5907\u53f7\u4e0d\u4f1a\u7acb\u5373\u56de\u6536\u3002\u65b0\u7684 DRM \u8bbe\u5907\u603b\u662f\u9009\u62e9\u6bd4\u4e4b\u524d\u5206\u914d\u7684\u4e0b\u4e00\u4e2a\u7a7a\u95f2\u6b21\u8bbe\u5907\u53f7&#xff0c;\u5e76\u5728\u6b21\u8bbe\u5907\u53f7\u8017\u5c3d\u65f6\u56de\u7ed5\u3002<\/p>\n<p>\u8be5\u76ee\u6807\u81f3\u5c11\u5bf9\u5185\u6838\u548c\u9a71\u52a8\u63d0\u51fa\u4ee5\u4e0b\u8981\u6c42&#xff1a;<\/p>\n<h4>KMS UAPI \u7684\u8981\u6c42<\/h4>\n<ul>\n<li>KMS \u8fde\u63a5\u5668\u5fc5\u987b\u5c06\u5176\u72b6\u6001\u66f4\u6539\u4e3a\u5df2\u65ad\u5f00&#xff08;disconnected&#xff09;\u3002<\/li>\n<li>\u4f20\u7edf\u6a21\u5f0f\u8bbe\u7f6e\u548c\u9875\u9762\u7ffb\u8f6c&#xff08;pageflip&#xff09;&#xff0c;\u4ee5\u53ca\u539f\u5b50\u63d0\u4ea4&#xff08;atomic commit&#xff09;&#xff0c;\u5305\u62ec\u771f\u5b9e\u7684\u548c TEST_ONLY \u7684&#xff0c;\u4ee5\u53ca\u5176\u4ed6\u6240\u6709 ioctl \u8981\u4e48\u4ee5 ENODEV \u5931\u8d25&#xff0c;\u8981\u4e48\u4f2a\u88c5\u6210\u529f\u3002<\/li>\n<li>\u6302\u8d77\u7684\u975e\u963b\u585e KMS \u64cd\u4f5c\u5e94\u4f20\u9012\u7528\u6237\u6001\u671f\u671b\u7684 DRM \u4e8b\u4ef6\u3002\u8fd9\u4e5f\u9002\u7528\u4e8e\u4f2a\u88c5\u6210\u529f\u7684 ioctl\u3002<\/li>\n<li>\u5bf9\u5e95\u5c42\u8bbe\u5907\u5df2\u6d88\u5931\u7684\u8bbe\u5907\u8282\u70b9\u8c03\u7528 open() \u5c06\u4ee5 ENXIO \u5931\u8d25\u3002<\/li>\n<li>\u5c1d\u8bd5\u5728\u5df2\u6d88\u5931\u7684 DRM \u8bbe\u5907\u4e0a\u521b\u5efa DRM \u79df\u7ea6\u5c06\u4ee5 ENODEV \u5931\u8d25\u3002\u73b0\u6709\u7684 DRM \u79df\u7ea6\u7ee7\u7eed\u5b58\u5728\u5e76\u6309\u4e0a\u8ff0\u65b9\u5f0f\u5de5\u4f5c\u3002<\/li>\n<\/ul>\n<h4>\u6e32\u67d3\u548c\u8de8\u8bbe\u5907 UAPI \u7684\u8981\u6c42<\/h4>\n<ul>\n<li>\u6240\u6709\u65e0\u6cd5\u518d\u8fd0\u884c\u7684 GPU \u4f5c\u4e1a\u5fc5\u987b\u5f3a\u5236\u4fe1\u53f7\u5316&#xff08;force-signal&#xff09;\u5176 fence&#xff0c;\u4ee5\u907f\u514d\u7ed9\u7528\u6237\u6001\u9020\u6210\u6302\u8d77\u3002\u76f8\u5173\u9519\u8bef\u7801\u4e3a ENODEV\u3002<\/li>\n<li>\u4e00\u4e9b\u7528\u6237\u6001 API \u5df2\u7ecf\u5b9a\u4e49\u4e86\u8bbe\u5907\u6d88\u5931\u65f6\u5e94\u53d1\u751f\u7684\u884c\u4e3a&#xff08;OpenGL\u3001GL ES&#xff1a;GL_KHR_robustness&#xff1b;Vulkan&#xff1a;VK_ERROR_DEVICE_LOST \u7b49&#xff09;\u3002DRM \u9a71\u52a8\u53ef\u4ee5\u81ea\u7531\u5b9e\u73b0\u6b64\u884c\u4e3a&#xff0c;\u4f8b\u5982\u5728\u9a71\u52a8\u7279\u5b9a\u7684 ioctl \u4e2d\u8fd4\u56de\u5931\u8d25\u5e76\u5728\u7528\u6237\u6001\u9a71\u52a8\u4e2d\u5904\u7406&#xff0c;\u6216\u4f9d\u8d56 uevent \u7b49\u3002<\/li>\n<li>\u6307\u5411\u5df2\u6d88\u5931\u5185\u5b58\u7684 dmabuf \u8981\u4e48\u4ee5 ENODEV \u5bfc\u5165\u5931\u8d25&#xff0c;\u8981\u4e48\u5982\u679c\u5728\u6d88\u5931\u524d\u5bfc\u5165\u4f1a\u6210\u529f\u5219\u7ee7\u7eed\u6210\u529f\u5bfc\u5165\u3002\u5173\u4e8e\u5df2\u5bfc\u5165 dmabuf \u7684\u5185\u5b58\u6620\u5c04\u53e6\u89c1\u4e0b\u6587\u3002<\/li>\n<li>\u5c1d\u8bd5\u5c06 dmabuf \u5bfc\u5165\u5230\u5df2\u6d88\u5931\u7684\u8bbe\u5907\u5c06\u8981\u4e48\u4ee5 ENODEV \u5931\u8d25&#xff0c;\u8981\u4e48\u5982\u679c\u5728\u6ca1\u6709\u6d88\u5931\u7684\u60c5\u51b5\u4e0b\u4f1a\u6210\u529f\u5219\u6210\u529f\u3002<\/li>\n<li>\u5bf9\u5e95\u5c42\u8bbe\u5907\u5df2\u6d88\u5931\u7684\u8bbe\u5907\u8282\u70b9\u8c03\u7528 open() \u5c06\u4ee5 ENXIO \u5931\u8d25\u3002<\/li>\n<\/ul>\n<h4>\u5185\u5b58\u6620\u5c04\u7684\u8981\u6c42<\/h4>\n<p>\u5185\u5b58\u6620\u5c04\u6709\u8fdb\u4e00\u6b65\u7684\u8981\u6c42&#xff0c;\u9002\u7528\u4e8e\u73b0\u6709\u6620\u5c04\u548c\u8bbe\u5907\u6d88\u5931\u540e\u521b\u5efa\u7684\u6620\u5c04\u3002<\/p>\n<ul>\n<li>\u5982\u679c\u5e95\u5c42\u5185\u5b58\u6d88\u5931&#xff0c;\u6620\u5c04\u88ab\u521b\u5efa\u6216\u4fee\u6539\u4e3a\u8bfb\u5199\u4ecd\u80fd\u6210\u529f\u5b8c\u6210\u4f46\u7ed3\u679c\u672a\u5b9a\u4e49\u3002\u8fd9\u9002\u7528\u4e8e\u7528\u6237\u6001 mmap \u7684\u5185\u5b58\u548c\u6307\u5411 dmabuf \u7684\u5185\u5b58&#xff08;\u53ef\u80fd\u88ab\u6620\u5c04\u5230\u5176\u4ed6\u8bbe\u5907\u2014\u2014\u8de8\u8bbe\u5907 dmabuf \u5bfc\u5165&#xff09;\u3002<\/li>\n<li>\u5f15\u53d1 SIGBUS \u4e0d\u662f\u4e00\u4e2a\u9009\u9879&#xff0c;\u56e0\u4e3a\u7528\u6237\u6001\u5b9e\u9645\u4e0a\u65e0\u6cd5\u5904\u7406\u5b83\u3002\u4fe1\u53f7\u5904\u7406\u5668\u662f\u5168\u5c40\u7684&#xff0c;\u8fd9\u4f7f\u5f97\u4ece Mesa \u7b49\u5e93\u4e2d\u6b63\u786e\u4f7f\u7528\u5b83\u4eec\u6781\u5176\u56f0\u96be\u3002\u4fe1\u53f7\u5904\u7406\u5668\u4e0d\u53ef\u7ec4\u5408&#xff0c;\u4f60\u4e0d\u80fd\u4e3a\u6765\u81ea\u4e0d\u540c\u5382\u5546\u7684 GPU1 \u548c GPU2 \u8bbe\u7f6e\u4e0d\u540c\u7684\u5904\u7406\u5668&#xff0c;\u518d\u4e3a mmap \u7684\u5e38\u89c4\u6587\u4ef6\u8bbe\u7f6e\u7b2c\u4e09\u4e2a\u5904\u7406\u5668\u3002\u7ebf\u7a0b\u4e5f\u4f1a\u7ed9\u4fe1\u53f7\u5904\u7406\u5e26\u6765\u989d\u5916\u7684\u75db\u82e6\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u8bbe\u5907\u91cd\u7f6e&#xff08;Device reset&#xff09;<\/h3>\n<p>GPU \u6808\u975e\u5e38\u590d\u6742&#xff0c;\u5bb9\u6613\u51fa\u9519\u2014\u2014\u4ece\u786c\u4ef6 bug\u3001\u6709\u7f3a\u9677\u7684\u5e94\u7528\u7a0b\u5e8f\u5230\u4f17\u591a\u5c42\u4e4b\u95f4\u7684\u4e00\u5207\u3002\u67d0\u4e9b\u9519\u8bef\u9700\u8981\u91cd\u7f6e\u8bbe\u5907\u624d\u80fd\u4f7f\u8bbe\u5907\u91cd\u65b0\u53ef\u7528\u3002\u672c\u8282\u63cf\u8ff0\u8bbe\u5907\u91cd\u7f6e\u65f6 DRM \u548c\u7528\u6237\u6001\u9a71\u52a8\u7684\u671f\u671b&#xff0c;\u4ee5\u53ca\u5982\u4f55\u4f20\u64ad\u91cd\u7f6e\u72b6\u6001\u3002<\/p>\n<p>\u8bbe\u5907\u91cd\u7f6e\u4e0d\u80fd\u5728\u4e0d\u6c61\u67d3&#xff08;tainting&#xff09;\u5185\u6838\u7684\u60c5\u51b5\u4e0b\u88ab\u7981\u7528&#xff0c;\u8fd9\u53ef\u80fd\u5bfc\u81f4\u901a\u8fc7 shrinker\/mmu_notifier \u6302\u8d77\u6574\u4e2a\u5185\u6838\u3002\u7528\u6237\u6001\u5728\u8bbe\u5907\u91cd\u7f6e\u4e2d\u7684\u89d2\u8272\u662f\u5c06\u6d88\u606f\u4f20\u64ad\u7ed9\u5e94\u7528\u7a0b\u5e8f&#xff0c;\u5e76\u5e94\u7528\u4efb\u4f55\u963b\u6b62\u6709\u8d23\u4efb\u7684\u5e94\u7528\u7a0b\u5e8f\u7684\u7279\u6b8a\u7b56\u7565&#xff08;\u5982\u679c\u6709\u7684\u8bdd&#xff09;\u3002\u63a8\u8bba\u662f&#xff0c;\u8c03\u8bd5\u6302\u8d77\u7684 GPU \u4e0a\u4e0b\u6587\u9700\u8981\u786c\u4ef6\u652f\u6301&#xff0c;\u4ee5\u4fbf\u80fd\u591f\u62a2\u5360\u5df2\u505c\u6b62\u7684 GPU \u4e0a\u4e0b\u6587\u3002<\/p>\n<h4>\u5185\u6838\u6a21\u5f0f\u9a71\u52a8&#xff08;Kernel Mode Driver&#xff09;<\/h4>\n<p>KMD \u8d1f\u8d23\u68c0\u67e5\u8bbe\u5907\u662f\u5426\u9700\u8981\u91cd\u7f6e&#xff0c;\u5e76\u6839\u636e\u9700\u8981\u6267\u884c\u91cd\u7f6e\u3002\u901a\u5e38\u5728\u4f5c\u4e1a\u6267\u884c\u5361\u4f4f\u65f6\u68c0\u6d4b\u5230\u6302\u8d77\u3002KMD \u5e94\u8ddf\u8e2a\u91cd\u7f6e&#xff0c;\u56e0\u4e3a\u7528\u6237\u6001\u53ef\u4ee5\u968f\u65f6\u67e5\u8be2\u7279\u5b9a\u4e0a\u4e0b\u6587\u7684\u91cd\u7f6e\u72b6\u6001\u3002\u8fd9\u5bf9\u4e8e\u5411\u6808\u7684\u5176\u4f59\u90e8\u5206\u4f20\u64ad\u5df2\u53d1\u751f\u91cd\u7f6e\u662f\u5fc5\u8981\u7684\u3002\u76ee\u524d&#xff0c;\u8fd9\u7531\u6bcf\u4e2a\u9a71\u52a8\u5355\u72ec\u5b9e\u73b0&#xff0c;\u6ca1\u6709\u901a\u7528\u7684 DRM \u63a5\u53e3\u3002\u7406\u60f3\u60c5\u51b5\u4e0b&#xff0c;\u8fd9\u5e94\u8be5\u5728 DRM \u8c03\u5ea6\u5668\u4e2d\u9002\u5f53\u96c6\u6210&#xff0c;\u4e3a\u6240\u6709\u9a71\u52a8\u63d0\u4f9b\u5171\u540c\u57fa\u7840\u3002\u91cd\u7f6e\u540e&#xff0c;KMD \u5e94\u62d2\u7edd\u53d7\u5f71\u54cd\u4e0a\u4e0b\u6587\u7684\u65b0\u547d\u4ee4\u63d0\u4ea4\u3002<\/p>\n<h4>\u7528\u6237\u6a21\u5f0f\u9a71\u52a8&#xff08;User Mode Driver&#xff09;<\/h4>\n<p>\u547d\u4ee4\u63d0\u4ea4\u540e&#xff0c;UMD \u5e94\u68c0\u67e5\u63d0\u4ea4\u662f\u88ab\u63a5\u53d7\u8fd8\u662f\u88ab\u62d2\u7edd\u3002\u91cd\u7f6e\u540e&#xff0c;KMD \u5e94\u62d2\u7edd\u63d0\u4ea4&#xff0c;UMD \u53ef\u4ee5\u5411 KMD \u53d1\u51fa ioctl \u68c0\u67e5\u91cd\u7f6e\u72b6\u6001&#xff0c;\u5982\u679c UMD \u9700\u8981\u53ef\u4ee5\u66f4\u9891\u7e41\u5730\u68c0\u67e5\u3002\u68c0\u6d4b\u5230\u91cd\u7f6e\u540e&#xff0c;UMD \u5c06\u4f7f\u7528\u9002\u5f53\u7684 API \u9519\u8bef\u7801\u5c06\u5176\u62a5\u544a\u7ed9\u5e94\u7528\u7a0b\u5e8f&#xff0c;\u5982\u4e0b\u6587\u5173\u4e8e\u5065\u58ee\u6027&#xff08;robustness&#xff09;\u7684\u7ae0\u8282\u6240\u8ff0\u3002<\/p>\n<h4>\u5065\u58ee\u6027&#xff08;Robustness&#xff09;<\/h4>\n<p>\u91cd\u7f6e\u540e\u5c1d\u8bd5\u4fdd\u6301\u56fe\u5f62 API \u4e0a\u4e0b\u6587\u5de5\u4f5c\u7684\u552f\u4e00\u65b9\u6cd5\u662f\u5b83\u9075\u5b88\u6240\u4f7f\u7528\u7684\u56fe\u5f62 API \u7684\u5065\u58ee\u6027\u65b9\u9762\u3002\u56fe\u5f62 API \u4e3a\u5e94\u7528\u7a0b\u5e8f\u63d0\u4f9b\u4e86\u5904\u7406\u8bbe\u5907\u91cd\u7f6e\u7684\u65b9\u6cd5\u3002\u7136\u800c&#xff0c;\u4e0d\u80fd\u4fdd\u8bc1\u5e94\u7528\u4f1a\u6b63\u786e\u4f7f\u7528\u8fd9\u4e9b\u529f\u80fd&#xff0c;\u800c\u4e00\u4e2a\u4e0d\u652f\u6301\u5065\u58ee\u6027\u63a5\u53e3\u7684\u7528\u6237\u6001&#xff08;\u5982\u975e\u5065\u58ee\u6027 OpenGL \u4e0a\u4e0b\u6587\u6216\u6ca1\u6709\u5065\u58ee\u6027\u652f\u6301\u7684 API \u5982 libva&#xff09;\u5c06\u5065\u58ee\u6027\u5904\u7406\u5b8c\u5168\u4ea4\u7ed9\u7528\u6237\u6001\u9a71\u52a8\u3002\u5173\u4e8e\u7528\u6237\u6001\u9a71\u52a8\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u5e94\u8be5\u505a\u4ec0\u4e48&#xff0c;\u793e\u533a\u6ca1\u6709\u5f3a\u70c8\u7684\u5171\u8bc6&#xff0c;\u56e0\u4e3a\u6240\u6709\u5408\u7406\u7684\u65b9\u6cd5\u90fd\u6709\u4e00\u4e9b\u660e\u663e\u7684\u7f3a\u70b9\u3002<\/p>\n<p>OpenGL&#xff1a;\u4f7f\u7528 OpenGL \u7684\u5e94\u7528\u5e94\u4f7f\u7528\u53ef\u7528\u7684\u5065\u58ee\u6027\u63a5\u53e3&#xff0c;\u5982\u6269\u5c55 GL_ARB_robustness&#xff08;\u6216 OpenGL ES \u7684 GL_EXT_robustness&#xff09;\u3002\u6b64\u63a5\u53e3\u544a\u77e5\u662f\u5426\u53d1\u751f\u4e86\u91cd\u7f6e&#xff0c;\u5982\u679c\u662f&#xff0c;\u5219\u6240\u6709\u4e0a\u4e0b\u6587\u72b6\u6001\u90fd\u88ab\u89c6\u4e3a\u4e22\u5931&#xff0c;\u5e94\u7528\u7a0b\u5e8f\u901a\u8fc7\u521b\u5efa\u65b0\u7684\u72b6\u6001\u7ee7\u7eed\u3002\u5982\u679c\u6ca1\u6709\u4f7f\u7528\u5065\u58ee\u6027&#xff0c;\u5219\u5e94\u505a\u4ec0\u4e48\u6ca1\u6709\u5171\u8bc6\u3002<\/p>\n<p>Vulkan&#xff1a;\u4f7f\u7528 Vulkan \u7684\u5e94\u7528\u5e94\u68c0\u67e5\u63d0\u4ea4\u7684 VK_ERROR_DEVICE_LOST\u3002\u6b64\u9519\u8bef\u7801\u9664\u5176\u4ed6\u542b\u4e49\u5916&#xff0c;\u8868\u793a\u53d1\u751f\u4e86\u8bbe\u5907\u91cd\u7f6e&#xff0c;\u9700\u8981\u91cd\u65b0\u521b\u5efa\u4e0a\u4e0b\u6587\u4ee5\u7ee7\u7eed\u8fd0\u884c\u3002<\/p>\n<h4>\u62a5\u544a\u91cd\u7f6e\u539f\u56e0<\/h4>\n<p>\u9664\u4e86\u901a\u8fc7\u6808\u4f20\u64ad\u91cd\u7f6e\u4ee5\u4fbf\u5e94\u7528\u53ef\u4ee5\u6062\u590d\u5916&#xff0c;\u9a71\u52a8\u5f00\u53d1\u8005\u4e86\u89e3\u6700\u521d\u662f\u4ec0\u4e48\u5bfc\u81f4\u4e86\u91cd\u7f6e\u4e5f\u975e\u5e38\u6709\u7528\u3002DRM \u8bbe\u5907\u5e94\u4f7f\u7528 devcoredump \u5b58\u50a8\u6709\u5173\u91cd\u7f6e\u7684\u76f8\u5173\u4fe1\u606f&#xff0c;\u4ee5\u4fbf\u6b64\u4fe1\u606f\u53ef\u4ee5\u6dfb\u52a0\u5230\u7528\u6237\u9519\u8bef\u62a5\u544a\u4e2d\u3002<\/p>\n<hr \/>\n<h3>\u8bbe\u5907\u8282\u70b9\u4e0a\u7684 IOCTL \u652f\u6301&#xff08;IOCTL Support on Device Nodes&#xff09;<\/h3>\n<p>\u9996\u5148&#xff0c;\u9a71\u52a8\u79c1\u6709 IOCTL \u4ec5\u5e94\u7531\u652f\u6301\u6e32\u67d3\u7684\u9a71\u52a8\u4f7f\u7528\u3002\u5185\u6838\u6a21\u5f0f\u8bbe\u7f6e\u5df2\u5168\u90e8\u6807\u51c6\u5316&#xff0c;\u5e76\u901a\u8fc7\u5c5e\u6027\u8fdb\u884c\u6269\u5c55\u3002\u4e00\u4e9b\u73b0\u6709\u9a71\u52a8\u4e2d\u6709\u4e00\u4e9b\u4f8b\u5916&#xff0c;\u5b83\u4eec\u5b9a\u4e49\u4e86\u4f9b\u663e\u793a DRM master \u4f7f\u7528\u7684 IOCTL&#xff0c;\u4f46\u5b83\u4eec\u90fd\u65e9\u4e8e\u5c5e\u6027\u673a\u5236\u3002<\/p>\n<p>\u73b0\u5728\u5982\u679c\u4f60\u6709\u4e00\u4e2a\u6e32\u67d3\u9a71\u52a8&#xff0c;\u4f60\u59cb\u7ec8\u5fc5\u987b\u901a\u8fc7\u9a71\u52a8\u79c1\u6709\u5c5e\u6027\u6765\u652f\u6301\u5b83\u3002\u6709\u51e0\u6b65\u9700\u8981\u5b8c\u6210\u6765\u5c06\u6240\u6709\u4e1c\u897f\u4e32\u8054\u8d77\u6765\u3002<\/p>\n<p>\u9996\u5148&#xff0c;\u4f60\u9700\u8981\u5728\u9a71\u52a8\u79c1\u6709 UAPI \u5934\u6587\u4ef6 include\/uapi\/drm\/my_driver_drm.h \u4e2d\u4e3a\u4f60\u7684 IOCTL \u5b9a\u4e49\u7ed3\u6784\u4f53&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">my_driver_operation<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    u32 some_thing<span class=\"token punctuation\">;<\/span><br \/>\n    u32 another_thing<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8bf7\u786e\u4fdd\u9075\u5faa Documentation\/process\/botching-up-ioctls.rst \u4e2d\u7684\u6240\u6709\u6700\u4f73\u5b9e\u8df5\u3002\u6ce8\u610f drm_ioctl() \u4f1a\u81ea\u52a8\u5bf9\u7ed3\u6784\u4f53\u8fdb\u884c\u96f6\u6269\u5c55&#xff0c;\u56e0\u6b64\u786e\u4fdd\u4f60\u53ef\u4ee5\u5728\u672b\u5c3e\u6dfb\u52a0\u66f4\u591a\u5185\u5bb9&#xff0c;\u5373\u4e0d\u8981\u5728\u90a3\u91cc\u653e\u7f6e\u53ef\u53d8\u5927\u5c0f\u7684\u6570\u7ec4\u3002<\/p>\n<p>\u7136\u540e&#xff0c;\u4f60\u9700\u8981\u4f7f\u7528 DRM_IO()\u3001DRM_IOR()\u3001DRM_IOW() \u6216 DRM_IOWR() \u4e4b\u4e00\u5b9a\u4e49\u4f60\u7684 IOCTL \u7f16\u53f7\u3002\u5b83\u5fc5\u987b\u4ee5 DRM_IOCTL_ \u524d\u7f00\u5f00\u5934&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">DRM_IOCTL_MY_DRIVER_OPERATION<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token function\">DRM_IOW<\/span><span class=\"token punctuation\">(<\/span>DRM_COMMAND_BASE<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">my_driver_operation<\/span><span class=\"token punctuation\">)<\/span><\/span><\/span><\/p>\n<p>DRM \u9a71\u52a8\u79c1\u6709 IOCTL \u5fc5\u987b\u5728 DRM_COMMAND_BASE \u5230 DRM_COMMAND_END \u7684\u8303\u56f4\u5185\u3002<\/p>\n<p>\u6700\u540e&#xff0c;\u4f60\u9700\u8981\u4e00\u4e2a struct drm_ioctl_desc \u6570\u7ec4\u6765\u8fde\u63a5\u5904\u7406\u7a0b\u5e8f\u5e76\u8bbe\u7f6e\u8bbf\u95ee\u6743\u9650&#xff1a;<\/p>\n<p><span class=\"token keyword\">static<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">drm_ioctl_desc<\/span> my_driver_ioctls<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">DRM_IOCTL_DEF_DRV<\/span><span class=\"token punctuation\">(<\/span>MY_DRIVER_OPERATION<span class=\"token punctuation\">,<\/span> my_driver_operation<span class=\"token punctuation\">,<\/span><br \/>\n                      DRM_AUTH<span class=\"token operator\">|<\/span>DRM_RENDER_ALLOW<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u7136\u540e\u5c06\u5176\u8d4b\u503c\u7ed9\u9a71\u52a8\u7ed3\u6784\u4f53\u4e2d\u7684 drm_driver.ioctls \u5b57\u6bb5\u3002\u6709\u5173\u9a71\u52a8\u7279\u5b9a IOCTL \u5982\u4f55\u8fde\u63a5\u7684\u8be6\u60c5&#xff0c;\u8bf7\u53c2\u89c1\u5173\u4e8e\u6587\u4ef6\u64cd\u4f5c\u7684\u5355\u72ec\u7ae0\u8282\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7528\u6237\u6001\u63a5\u53e3&#xff08;Userland interfaces&#xff09;<br \/>\nDRM \u6838\u5fc3\u5411\u5e94\u7528\u7a0b\u5e8f\u5bfc\u51fa\u4e86\u82e5\u5e72\u63a5\u53e3&#xff0c;\u901a\u5e38\u901a\u8fc7\u76f8\u5e94\u7684 libdrm \u5c01\u88c5\u51fd\u6570\u6765\u4f7f\u7528\u3002\u6b64\u5916&#xff0c;\u9a71\u52a8\u8fd8\u901a\u8fc7 ioctl \u548c sysfs 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