dev, false); dev->admin_tagset.flags = BLK_MQ_F_NO_SCHED; dev->admin_tagset.driver_data = dev; //1. 硬件调度队列数>cpu数时,硬件调度队列数=cpu数 //2. 给blk_mq_tag_set*set->tags[]分配nr_cpu个blk_mq_tags指针, //3. 给dev->admin_tagset->map[i].mq_map分配nr_cpu个,用于...
result = nvme_dev_map(dev); //pcie bar空间映射 if (result) return result; result = nvme_configure_admin_queue(dev); //管理队列配置 if (result) goto unmap; spin_lock(&dev_list_lock); list_add(&dev->node, &dev_list); //dev_list没太明白是定义在那个文件的? spin_unlock(&dev_list...
自己的completion queue(cq),用于nvme设备将完成的命令信息(struct nvme_completion)发送给host,并且最多能存dev->d_depth个nvme_completion. 自己的cmdinfo,用于描述一个nvme command.(struct nvme_cmd_info) 可以把sq想象成一个struct nvme_command sq[dev->d_depth]的数组,而cq为struct nvme_completion cq[dev...
static int nvme_dev_map(struct nvme_dev *dev) { int bars; struct pci_dev *pdev = to_pci_dev(dev->dev); bars = pci_select_bars(pdev, IORESOURCE_MEM); if (!bars) return -ENODEV; if (pci_request_selected_regions(pdev, bars, "nvme")) return -ENODEV; dev->bar = ioremap(pci_r...
SPDK对于NVMe/TCP transport的一些Roadmap 1. 功能的继续完善:继续遵循NVM Express 制定的有关TCP transport的SPEC。不仅确保了SPDK target 和host的交互性正常,另外要继续保证和Kernel 实现的交互性正常。 2. 性能优化,可能有以下几个方面: a. 优化已有的TCP transport中的代码。
obj-$(CONFIG_BLK_DEV_NVME) += nvme.o nvme-y := nvme-core.o nvme-scsi.o 关于和BLK相关的文件,打开block/Makefile: obj-$(CONFIG_BLOCK) := bio.oelevator.o blk-core.o blk-tag.o blk-sysfs.o \ blk-flush.o blk-settings.o blk-ioc.oblk-map.o \blk-exec.o blk-merge.o blk-softir...
nvme_probe函数分析:首先,申请nvme_dev数据结构内存,作为nvme设备驱动信息的内存载体;给dev->queues申请内存,这个queue是若干对SQ&CQ的指针数组,数组大小即SQ&CQ的对数,其取决于cpu个数,即相当于这里的分配方式一个cpu一对SQ&CQ,这是协议规范里面的经典样式;再使用nvme_dev_map去保留mem和io映射空间,remap寄存器地...
/*nvme设备描述符,描述一个nvme设备*/structnvme_dev {structlist_head node;/*设备的queue,一个nvme设备至少有2个queue,一个admin queue,一个io queue,实际情况一般都是一个admin queue,多个io queue,并且io queue会与CPU做绑定*/structnvme_queue __rcu **queues;/*unsigned short的数组,每个CPU占一个,主...
NVMe SSD最适合企业工作负载处理和人工智能、机器学习项目、实时分析、大数据传输和DevOps。它们通常用于...
An Advanced Linux RAM Drive and Caching kernel modules. Dynamically allocate RAM as block devices. Use them as stand alone drives or even map them as caching nodes to slower local disk drives. Access those volumes locally or export them across an NVMe Target network. Manage it all from a we...