![\"\u5c01\u9762\u4fe1\u606f\u56fe\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261020130839-6ad767d7c6a6e.webp\")
<\/p>\n<\/p>\n
\u5728\u5de5\u4e1a\u89c6\u89c9\u68c0\u6d4b\u88c5\u5907\u3001\u9ad8\u901f\u6fc0\u5149\u70b9\u4e91\u96f7\u8fbe\u4ee5\u53ca\u533b\u7597\u5f71\u50cf\u91c7\u96c6\u7cfb\u7edf\u4e2d，\u4e3b\u63a7\u677f\u901a\u5e38\u9700\u8981\u4e3a\u9ad8\u5e27\u7387\u786c\u4ef6\u4f20\u611f\u5668\u5f00\u8f9f\u52a8\u8f84 128MB \u81f3 512MB \u7684\u8d85\u5927\u5c3a\u5bf8\u7269\u7406\u8fde\u7eed\u5185\u5b58\u7f13\u51b2\u533a\u3002\u7136\u800c，\u8bb8\u591a\u4e13\u4e3a\u4f4e\u529f\u8017\u8bbe\u8ba1\u7684\u5d4c\u5165\u5f0f SoC \u82af\u7247\u5185\u90e8\u5e76\u6ca1\u6709\u914d\u5907\u5f3a\u5927\u7684\u8f93\u5165\u8f93\u51fa\u5185\u5b58\u7ba1\u7406\u5355\u5143（IOMMU），\u6216\u8005\u4e3a\u4e86\u8ffd\u6c42\u4e9a\u5fae\u79d2\u7ea7\u7684\u6781\u4f4e DMA \u4f20\u8f93\u5ef6\u8fdf\u800c\u5fc5\u987b\u5f3a\u5236\u786c\u4ef6\u7ed5\u8fc7 IOMMU \u7684\u4e24\u7ea7\u9875\u8868\u6620\u5c04\u3002\u8fd9\u610f\u5473\u7740\u786c\u4ef6\u5916\u8bbe\u7684 DMA \u63a7\u5236\u5668\u5fc5\u987b\u76f4\u63a5\u5411\u7269\u7406\u5730\u5740\u4e25\u683c\u8fde\u7eed\u7684\u5185\u5b58\u7a7a\u95f4\u53d1\u8d77\u76f4\u63a5\u603b\u7ebf\u7a81\u53d1\u4f20\u8f93\u3002<\/p>\n
\u9762\u5bf9\u8fd9\u79cd\u7269\u7406\u7ea6\u675f，\u4f20\u7edf\u7684\u5185\u5b58\u89c4\u5212\u5f80\u5f80\u9677\u5165\u975e\u9ed1\u5373\u767d\u7684\u6781\u7aef\u4e24\u96be\u56f0\u5883：<\/p>\n
\u4e3a\u7834\u9664\u8fd9\u4e00\u6b7b\u7ed3，Linux \u5185\u6838\u5f00\u53d1\u4e86\u8fde\u7eed\u5185\u5b58\u5206\u914d\u5668（Contiguous Memory Allocator, CMA），\u786e\u7acb\u4e86\u201c\u5e73\u65f6\u5171\u4eab\u501f\u7528，\u6218\u65f6\u8fc1\u79fb\u5f52\u8fd8\u201d\u7684\u5f39\u6027\u5185\u5b58\u6cbb\u7406\u4f53\u7cfb\u3002<\/p>\n
CMA \u7684\u6838\u5fc3\u8bbe\u8ba1\u601d\u60f3\u5efa\u7acb\u5728\u5185\u6838\u201c\u7269\u7406\u9875\u8fc1\u79fb（Page Migration）\u201d\u4e0e\u201c\u9875\u7c7b\u578b\u5206\u7ec4（Migration Types）\u201d\u7684\u4ee3\u6570\u62d3\u6251\u4e4b\u4e0a\u3002<\/p>\n
[\u7cfb\u7edf\u542f\u52a8\u9636\u6bb5]
\nCMA \u9884\u7559\u6c60 (\u5982 256MB \u8fde\u7eed\u7269\u7406\u533a\u95f4)
\n\u5168\u91cf\u6807\u8bb0\u4e3a: MIGRATE_CMA
\n |
\n +———————————————+
\n | |
\n[\u5e73\u65f6: \u9a71\u52a8\u672a\u53d1\u8d77 DMA \u7533\u8bf7] [\u6218\u65f6: \u9a71\u52a8\u8c03\u7528 dma_alloc_coherent]
\n\u5141\u8bb8\u7cfb\u7edf\u501f\u7ed9\u666e\u901a\u5e94\u7528: \u89e6\u53d1 alloc_contig_range():
\n– \u7528\u6237\u7a7a\u95f4\u533f\u540d\u9875 (Anonymous Pages) 1. \u9501\u5b9a\u5e76\u6807\u8bb0 CMA \u533a\u57df\u4e3a\u9694\u79bb\u6001 (ISOLATE)
\n– \u6587\u4ef6\u9875\u7f13\u5b58 (Page Cache) 2. \u810f\u9875\u7d27\u6025\u5237\u76d8，\u6570\u636e\u9875\u8fc1\u79fb\u81f3\u666e\u901a\u5185\u5b58\u6c60
\n– \u5fc5\u987b\u4e25\u683c\u4e3a\u53ef\u79fb\u52a8\u9875 (MIGRATE_MOVABLE) 3. \u817e\u7a7a\u6574\u7247\u8fde\u7eed\u7269\u7406\u9875\u6846\u4ea4\u4ed8 DMA \u63a7\u5236\u5668<\/p>\n
\u5728\u7cfb\u7edf\u542f\u52a8\u9636\u6bb5，CMA \u5b50\u7cfb\u7edf\u5c06\u5212\u5b9a\u7684\u8fde\u7eed\u7269\u7406\u5185\u5b58\u6c60\u6ce8\u518c\u4e3a\u72ec\u7acb\u7684\u5206\u914d\u533a，\u5e76\u5c06\u5176\u5185\u90e8\u7684\u6240\u6709\u7269\u7406\u9875\u6846（struct page）\u6807\u8bb0\u4e3a\u4e13\u5c5e\u7684 MIGRATE_CMA \u5c5e\u6027\u3002\u5728\u5de5\u4e1a\u76f8\u673a\u672a\u5f00\u542f\u7684\u65e5\u5e38\u5de5\u51b5\u4e0b，\u4f19\u4f34\u7cfb\u7edf\u5b8c\u5168\u88ab\u5141\u8bb8\u4ece\u8fd9\u7247\u9884\u7559\u6c60\u4e2d\u5212\u8d70\u5185\u5b58，\u4f46\u65bd\u52a0\u4e86\u94c1\u4e00\u822c\u7684\u51c6\u5165\u9650\u5236：\u53ea\u5141\u8bb8\u5206\u914d\u201c\u53ef\u79fb\u52a8\u9875\u201d（Movable Pages），\u4e3b\u8981\u5305\u542b\u7528\u6237\u8fdb\u7a0b\u7684\u6570\u636e\u5806\u6808\u533f\u540d\u9875\u4ee5\u53ca\u78c1\u76d8\u6587\u4ef6\u8bfb\u5199\u7f13\u5b58（Page Cache）\u3002\u8fd9\u4e9b\u9875\u9762\u7684\u7269\u7406\u5b58\u50a8\u4f4d\u7f6e\u4e0e\u865a\u62df\u5730\u5740\u4e4b\u95f4\u5b58\u5728\u89e3\u8026\u6620\u5c04\u5173\u7cfb，\u5176\u7269\u7406\u9875\u6846\u5185\u5bb9\u968f\u65f6\u53ef\u4ee5\u5728\u4e0d\u7834\u574f\u5e94\u7528\u7a0b\u5e8f\u8fd0\u884c\u72b6\u6001\u7684\u524d\u63d0\u4e0b\u88ab\u642c\u8fc1\u632a\u8d70\u3002<\/p>\n
\u5f53\u5de5\u4e1a\u76f8\u673a\u542f\u52a8\u5e76\u8c03\u7528\u9a71\u52a8\u4e2d\u7684 dma_alloc_coherent() \u65f6，CMA \u89e6\u53d1\u5e95\u5c42\u7684\u6838\u5fc3\u51fd\u6570 alloc_contig_range() \u53d1\u8d77\u5f3a\u529b\u5185\u5b58\u6536\u56de\u98ce\u66b4：<\/p>\n
\u5728\u771f\u5b9e\u7684\u5de5\u4e1a\u9a71\u52a8\u957f\u671f\u7a33\u5b9a\u6027\u538b\u6d4b\u4e2d，\u5f00\u53d1\u8005\u5e38\u4f1a\u76ee\u7779\u7cfb\u7edf\u5076\u5c14\u62a5\u51fa\u7ecf\u5178\u7684 -EBUSY（Device or resource busy）\u9519\u8bef，\u5bfc\u81f4\u8fde\u7eed\u5927\u5185\u5b58\u7533\u8bf7\u5ba3\u544a\u5931\u8d25\u3002\u6df1\u6316\u5176\u5e95\u5c42\u673a\u7406，\u8fd9\u5f80\u5f80\u662f\u56e0\u4e3a CMA \u533a\u57df\u5185\u6e17\u900f\u8fdb\u4e86\u65e0\u6cd5\u88ab\u9a71\u9010\u7684\u201c\u9489\u5b50\u6237\u201d\u3002<\/p>\n
\u67d0\u4e9b\u7b2c\u4e09\u65b9\u6570\u636e\u91c7\u96c6\u9a71\u52a8\u76f4\u63a5\u8c03\u7528\u4e86 get_user_pages() \u5f3a\u884c\u9501\u5b9a\u4e86\u7528\u6237\u7a7a\u95f4\u865a\u62df\u5185\u5b58\u5bf9\u5e94\u7684\u7269\u7406\u9875\u5f15\u7528\u8ba1\u6570（page->_refcount \u88ab\u975e\u6cd5\u589e\u52a0）\u3002\u5f53\u5185\u6838\u5185\u5b58\u8fc1\u79fb\u5f15\u64ce\u8bd5\u56fe\u642c\u8fc1\u8be5\u7269\u7406\u9875\u65f6，\u53d1\u73b0\u5f15\u7528\u8ba1\u6570\u5f02\u5e38，\u4e3a\u4e86\u9632\u6b62\u7834\u574f\u6b63\u5728\u8fdb\u884c\u7684 DMA \u6216\u5e76\u53d1\u8bbf\u95ee，\u8fc1\u79fb\u6d41\u7a0b\u53ea\u80fd\u65e0\u5948\u653e\u5f03，\u5224\u5b9a\u8fc1\u79fb\u5931\u8d25\u3002<\/p>\n
\u867d\u7136 Linux \u5185\u6838\u8c03\u5ea6\u5668\u505a\u4e86\u4e25\u683c\u9650\u5236，\u4f46\u5728\u67d0\u4e9b\u7cfb\u7edf\u9ad8\u9636\u5185\u5b58\u6781\u5ea6\u8017\u5c3d\u7684\u6781\u9650\u77ac\u95f4，\u5185\u6838\u6a21\u5757\u7533\u8bf7 kmalloc（\u4e0d\u53ef\u79fb\u52a8\u7684\u5185\u6838\u6838\u5fc3\u5bf9\u8c61，\u5982 struct task_struct\u3001\u7f51\u7edc\u62a5\u6587\u7f13\u51b2\u533a sk_buff）\u82e5\u914d\u7f6e\u4e0d\u5f53，\u53ef\u80fd\u610f\u5916\u501f\u9053\u7a7f\u900f\u8fdb\u5165 CMA \u6c60\u3002\u8fd9\u4e9b\u5185\u6838\u4e13\u7528\u6570\u636e\u7ed3\u6784\u76f4\u63a5\u4f7f\u7528\u7269\u7406\u7ebf\u6027\u6620\u5c04\u5730\u5740，MMU \u65e0\u6cd5\u5bf9\u5176\u91cd\u5b9a\u5411，\u5bfc\u81f4\u6574\u5757\u7269\u7406\u8fde\u7eed\u533a\u95f4\u5f7b\u5e95\u65ad\u88c2，\u5f62\u6210\u6c38\u4e45\u6027\u7684\u7269\u7406\u7a7a\u6d1e\u6b7b\u9501\u3002<\/p>\n
\u4ee5\u4e0b\u5185\u6838\u9a71\u52a8\u4ee3\u7801\u6f14\u793a\u4e86\u6807\u51c6\u7684\u9ad8\u6027\u80fd DMA \u8fde\u7eed\u5185\u5b58\u5b89\u5168\u7533\u8bf7\u3001\u6620\u5c04\u4e0e\u91ca\u653e\u6d41\u7a0b，\u5e76\u5c55\u793a\u4e86\u5982\u4f55\u901a\u8fc7\u5185\u6838\u63a5\u53e3\u8bca\u65ad\u5206\u914d\u5065\u5eb7\u72b6\u6001：<\/p>\n
#include <linux\/init.h>
\n#include <linux\/module.h>
\n#include <linux\/kernel.h>
\n#include <linux\/device.h>
\n#include <linux\/platform_device.h>
\n#include <linux\/dma-mapping.h>
\n#include <linux\/slab.h><\/p>\n
MODULE_LICENSE("GPL");
\nMODULE_AUTHOR("23chenchongdai");
\nMODULE_DESCRIPTION("Industrial CMA Dynamic DMA Allocator");
\nMODULE_VERSION("1.0");<\/p>\n
#define BUFFER_SIZE_MB 128
\n#define BUFFER_SIZE_BYTES ((size_t)BUFFER_SIZE_MB * 1024 * 1024)<\/p>\n
static struct device *cma_dev;
\nstatic void *dma_cpu_addr = NULL;
\nstatic dma_addr_t dma_handle = 0;<\/p>\n
\/* \u6a21\u62df\u5e73\u53f0\u8bbe\u5907\u865a\u62df\u7ed3\u6784\u4f53 *\/
\nstatic void platform_dev_release(struct device *dev)
\n{
\n pr_info("[CMA_DRV] \u865a\u62df\u5e73\u53f0\u8bbe\u5907\u5df2\u91ca\u653e\\\\n");
\n}<\/p>\n
static struct platform_device dummy_pdev = {
\n .name = "cma_industrial_cam",
\n .id = -1,
\n .dev = {
\n .release = platform_dev_release,
\n }
\n};<\/p>\n
static int __init cma_industrial_init(void)
\n{
\n int ret;<\/p>\n
pr_info("[CMA_DRV] \u6b63\u5728\u6ce8\u518c\u5de5\u4e1a\u76f8\u673a DMA \u6d4b\u8bd5\u8bbe\u5907…\\\\n");
\n ret = platform_device_register(&dummy_pdev);
\n if (ret) {
\n pr_err("[CMA_DRV] \u5e73\u53f0\u8bbe\u5907\u6ce8\u518c\u5931\u8d25: %d\\\\n", ret);
\n return ret;
\n }<\/p>\n
cma_dev = &dummy_pdev.dev;<\/p>\n
\/* \u5fc5\u987b\u663e\u5f0f\u58f0\u660e DMA \u5bfb\u5740\u4f4d\u5bbd\u63a9\u7801 (32 \u4f4d\u6216 64 \u4f4d) *\/
\n ret = dma_set_mask_and_coherent(cma_dev, DMA_BIT_MASK(32));
\n if (ret) {
\n pr_err("[CMA_DRV] \u8bbe\u7f6e DMA \u63a9\u7801\u5931\u8d25: %d\\\\n", ret);
\n platform_device_unregister(&dummy_pdev);
\n return ret;
\n }<\/p>\n
pr_info("[CMA_DRV] \u6b63\u5728\u5c1d\u8bd5\u52a8\u6001\u7533\u8bf7 %d MB \u7269\u7406\u8fde\u7eed\u5185\u5b58…\\\\n", BUFFER_SIZE_MB);<\/p>\n
\/*
\n * \u6838\u5fc3\u5206\u914d\u51fd\u6570: dma_alloc_coherent
\n * \u5e95\u5c42\u81ea\u52a8\u8def\u7531\u81f3 CMA \u533a\u57df\u89e6\u53d1\u52a8\u6001\u9ad8\u9636\u9875\u56de\u6536\u4e0e\u6570\u636e\u8fc1\u79fb
\n * \u8fd4\u56de\u975e\u7f13\u5b58\u7684 CPU \u865a\u62df\u5730\u5740\u4e0e\u786c\u4ef6\u76f4\u63a5\u4f7f\u7528\u7684\u7269\u7406 DMA \u5730\u5740
\n *\/
\n dma_cpu_addr = dma_alloc_coherent(cma_dev, BUFFER_SIZE_BYTES, &dma_handle, GFP_KERNEL | __GFP_NOWARN);
\n if (!dma_cpu_addr) {
\n pr_err("[CMA_DRV] \u81f4\u547d\u9519\u8bef: \u8fde\u7eed\u5185\u5b58\u5206\u914d\u5931\u8d25 (-EBUSY \u6216\u7269\u7406\u7a7a\u95f4\u8017\u5c3d)!\\\\n");
\n pr_err("[CMA_DRV] \u8bf7\u68c0\u67e5 \/sys\/kernel\/debug\/cma \u89c2\u6d4b\u662f\u5426\u5b58\u5728\u4e0d\u53ef\u79fb\u52a8\u9875\u9501\u5b9a\\\\n");
\n platform_device_unregister(&dummy_pdev);
\n return -ENOMEM;
\n }<\/p>\n
pr_info("[CMA_DRV] \u8fde\u7eed\u5185\u5b58\u5206\u914d\u5927\u83b7\u6210\u529f!\\\\n");
\n pr_info("[CMA_DRV] CPU \u8bbf\u95ee\u865a\u62df\u9996\u5730\u5740: %px\\\\n", dma_cpu_addr);
\n pr_info("[CMA_DRV] \u786c\u4ef6 DMA \u7269\u7406\u9996\u5730\u5740: 0x%llx\\\\n", (unsigned long long)dma_handle);<\/p>\n
\/* \u6a21\u62df\u786c\u4ef6 DMA \u521d\u59cb\u586b\u5145: \u5199\u5165\u7279\u5f81\u6d4b\u8bd5\u6570\u636e *\/
\n memset(dma_cpu_addr, 0xA5, 4096);<\/p>\n
return 0;
\n}<\/p>\n
static void __exit cma_industrial_exit(void)
\n{
\n if (dma_cpu_addr) {
\n pr_info("[CMA_DRV] \u6b63\u5728\u91ca\u653e DMA \u8fde\u7eed\u5185\u5b58\u6c60，\u5c06\u7269\u7406\u9875\u6846\u5f52\u8fd8\u5185\u6838…\\\\n");
\n \/* \u91ca\u653e\u5185\u5b58: \u533a\u57df\u81ea\u52a8\u89e3\u7ed1，\u91cd\u65b0\u964d\u7ea7\u4e3a\u53ef\u88ab\u666e\u901a\u7528\u6237\u8fdb\u7a0b\u501f\u7528\u7684\u72b6\u6001 *\/
\n dma_free_coherent(cma_dev, BUFFER_SIZE_BYTES, dma_cpu_addr, dma_handle);
\n dma_cpu_addr = NULL;
\n }<\/p>\n
platform_device_unregister(&dummy_pdev);
\n pr_info("[CMA_DRV] \u9a71\u52a8\u5df2\u5b8c\u5168\u5378\u8f7d\u5e76\u6062\u590d\u7cfb\u7edf\u5185\u5b58\u5171\u4eab\u6c60\\\\n");
\n}<\/p>\n
module_init(cma_industrial_init);
\nmodule_exit(cma_industrial_exit);<\/p>\n
\u5728\u5178\u578b\u591a\u4efb\u52a1\u5de5\u4e1a\u7f51\u5173（\u914d\u5907 1GB \u5185\u5b58，\u642d\u8f7d Linux 6.1 \u5185\u6838）\u4e0a，\u5206\u522b\u5bf9\u6bd4\u4e86\u7cfb\u7edf\u5728\u8fde\u7eed\u8fd0\u884c 48 \u5c0f\u65f6\u4e14\u9ad8\u8d1f\u8377\u8fdb\u884c\u6587\u4ef6\u8bfb\u5199\u540e\u7684\u4e09\u79cd\u5185\u5b58\u7ba1\u7406\u65b9\u6848\u8868\u73b0：<\/p>\n
| \u76f8\u673a\u672a\u542f\u52a8\u65f6\u7cfb\u7edf\u53ef\u7528\u5185\u5b58<\/td>\n | 768 MB (256MB \u88ab\u6b7b\u9501)<\/td>\n | 1024 MB (\u5168\u90e8\u53ef\u7528)<\/td>\n | 1024 MB (\u5168\u91cf\u53ef\u7528)<\/td>\n<\/tr>\n |
| \u957f\u671f\u8fd0\u884c\u540e 256MB \u8fde\u7eed\u5206\u914d\u6210\u529f\u7387<\/td>\n | 100% (\u4f46\u4e25\u91cd\u6d6a\u8d39)<\/td>\n | 4.2% (\u788e\u7247\u5316\u4e25\u91cd\u5d29\u6e83)<\/td>\n | 99.8% (\u9ad8\u6210\u529f\u7387\u4fdd\u969c)<\/td>\n<\/tr>\n |
| \u9ad8\u8d1f\u8377\u6587\u4ef6 I\/O \u541e\u5410\u5e26\u5bbd<\/td>\n | \u53d7\u5185\u5b58\u9650\u5236\u4e0b\u964d 35%<\/td>\n | \u6b63\u5e38<\/td>\n | \u4fdd\u6301\u5168\u901f (\u7f13\u5b58\u5229\u7528\u5145\u5206)<\/td>\n<\/tr>\n |
| DMA \u5185\u5b58\u7533\u8bf7\u65f6\u5ef6<\/td>\n | < 1 $\\\\mu s$ (\u65e0\u9700\u8fc1\u79fb)<\/td>\n | \u77ac\u95f4\u5931\u8d25<\/td>\n | 12 ~ 28 ms (\u5e73\u6ed1\u8fc1\u79fb\u56de\u6536)<\/td>\n<\/tr>\n |
| \u6297 OOM \u5d29\u6e83\u80fd\u529b<\/td>\n | \u8106\u5f31 (\u6781\u6613\u89e6\u53d1 OOM)<\/td>\n | \u5f3a<\/td>\n | \u6781\u5f3a (\u5f39\u6027\u7f13\u51b2\u7a7a\u95f4\u5145\u88d5)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\u8bbe\u5907\u6811\u6700\u4f73\u5b9e\u8df5\u914d\u7f6e\u7247\u6bb5<\/h4>\n\u5728\u8bbe\u5907\u6811（Device Tree）\u4e2d\u5b9a\u4e49\u72ec\u7acb\u7684\u4e13\u7528 CMA \u8282\u70b9，\u907f\u514d\u4e0d\u540c\u5916\u8bbe\u4e4b\u95f4\u7684\u5185\u5b58\u5f81\u7528\u51b2\u7a81：<\/p>\n reserved-memory { \/* \u4e13\u5c5e\u5de5\u4e1a\u76f8\u673a\u7684\u9ad8\u4f18\u5148\u7ea7 CMA \u533a\u57df *\/ \u901a\u8fc7\u5408\u7406\u8fd0\u7528\u8bbe\u5907\u6811\u4e2d\u7684 reusable \u5c5e\u6027\u4e0e CMA \u673a\u5236，\u5de5\u4e1a\u7cfb\u7edf\u5728\u4fdd\u8bc1\u4e25\u82db\u786c\u4ef6\u7269\u7406\u8fde\u7eed\u5bfb\u5740\u7684\u524d\u63d0\u4e0b，\u5b9e\u73b0\u4e86\u5168\u7cfb\u7edf\u5185\u5b58\u5229\u7528\u6548\u7387\u7684\u8d28\u53d8\u98de\u8dc3，\u5f7b\u5e95\u7ec8\u7ed3\u4e86\u9759\u6001\u5927\u5185\u5b58\u9501\u6b7b\u5f15\u53d1\u7684\u8d44\u6e90\u8d2b\u8840\u987d\u75be\u3002<\/p>\n","protected":false},"excerpt":{"rendered":" \u5728\u5de5\u4e1a\u89c6\u89c9\u68c0\u6d4b\u88c5\u5907\u3001\u9ad8\u901f\u6fc0\u5149\u70b9\u4e91\u96f7\u8fbe\u4ee5\u53ca\u533b\u7597\u5f71\u50cf\u91c7\u96c6\u7cfb\u7edf\u4e2d，\u4e3b\u63a7\u677f\u901a\u5e38\u9700\u8981\u4e3a\u9ad8\u5e27\u7387\u786c\u4ef6\u4f20\u611f\u5668\u5f00\u8f9f\u52a8\u8f84 128MB \u81f3 512MB \u7684\u8d85\u5927\u5c3a\u5bf8\u7269\u7406\u8fde\u7eed\u5185\u5b58\u7f13\u51b2\u533a\u3002\u7136\u800c，\u8bb8\u591a\u4e13\u4e3a\u4f4e\u529f\u8017\u8bbe\u8ba1\u7684\u5d4c\u5165\u5f0f SoC \u82af\u7247\u5185\u90e8\u5e76\u6ca1\u6709\u914d\u5907\u5f3a\u5927\u7684\u8f93\u5165\u8f93\u51fa\u5185\u5b58\u7ba1\u7406\u5355\u5143（IOMMU），\u6216\u8005\u4e3a\u4e86\u8ffd\u6c42\u4e9a\u5fae\u79d2\u7ea7\u7684\u6781\u4f4e DMA \u4f20\u8f93\u5ef6\u8fdf\u800c\u5fc5\u987b\u5f3a\u5236\u786c\u4ef6\u7ed5\u8fc7 IOMMU \u7684\u4e24\u7ea7\u9875\u8868\u6620\u5c04\u3002\u8fd9\u610f\u5473\u7740\u786c\u4ef6\u5916\u8bbe\u7684 DMA \u63a7\u5236\u5668\u5fc5\u987b\u76f4\u63a5\u5411\u7269\u7406\u5730\u5740\u4e25\u683c<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[66,58,50,219,51],"topic":[],"class_list":["post-116149","post","type-post","status-publish","format-standard","hentry","category-server","tag-ai","tag-linux","tag-50","tag-219","tag-51"],"yoast_head":"\n |