默認情況下openwrt并沒有啟用nvme特性

需要使用make kernel_menuconfig 進入 Device 設置并啟用NVMe

編譯后啟動內核panic如下

[ 0.810128] Kernel bug detected[#1]: [ 0.813779] CPU: 0 PID: 9 Comm: kworker/u2:1 Not tainted 4.14.162 #0 [ 0.820240] Workqueue: nvme-wq nvme_reset_work [ 0.824749] task: 87c22d00 task.stack: 87cfa000 [ 0.829336] $ 0 : 00000000 00000001 80276b18 00000001 [ 0.834642] $ 4 : 87c1f8e8 00000000 87cfbd70 87d55c00 [ 0.839948] $ 8 : 00000000 00000008 00000000 00000001 [ 0.845252] $12 : 00000000 00000400 ffffffff 00000000 [ 0.850556] $16 : 87c1f8e8 87c1f844 87c1f800 804c0000 [ 0.855862] $20 : 87cf6c00 00000000 87c1f8e8 00000088 [ 0.861169] $24 : 00000400 c71307b5 [ 0.866475] $28 : 87cfa000 87cfbd50 804d0000 802752e4 [ 0.871784] Hi : 00000000 [ 0.874699] Lo : 00000001 [ 0.877624] epc : 80276b18 nvme_pci_reg_read64+0x0/0x4 [ 0.883012] ra : 802752e4 nvme_init_identify+0x94/0x6e0 [ 0.888568] Status: 11009403 KERNEL EXL IE [ 0.892819] Cause : 10800024 (ExcCode 09) [ 0.896883] PrId : 00019655 (MIPS 24KEc) [ 0.900942] Modules linked in: [ 0.904045] Process kworker/u2:1 (pid: 9, threadinfo=87cfa000, task=87c22d00, tls=00000000) [ 0.912506] Stack : 80038118 87c22d00 87e11600 87c1f844 87c1f800 87e11600 87c1f844 87c1f870 [ 0.920994] 87c1f87c 87cf6c00 00000000 801f35d4 87cf6c00 87c1f844 00000000 00000000 [ 0.929478] 87c1f844 87c1f844 87e11600 87c1f800 87ce9680 c71307b5 87c1f938 87c1f844 [ 0.937964] 87c1f800 87ce9680 87cf6c00 00000000 87c1f8e8 802785f8 87cb6198 00000000 [ 0.946448] 00000000 80024450 00000002 8003516c 87ce9d00 87c22d00 00000000 00000000 [ 0.954932] ... [ 0.957413] Call Trace: [ 0.959894] [<80276b18>] nvme_pci_reg_read64+0x0/0x4 [ 0.964930] [<802752e4>] nvme_init_identify+0x94/0x6e0 [ 0.970142] [<802785f8>] nvme_reset_work+0x488/0x1164

IDA反匯編后發現上述崩潰點的代碼竟然是

.text:000011E8 # =============== S U B R O U T I N E ======================================= .text:000011E8 .text:000011E8 .text:000011E8 nvme_pci_reg_read64: # DATA XREF: .rodata:00004570↓o .text:000011E8 break 0x3000 .text:000011E8 # End of function nvme_pci_reg_read64

查看源代碼?drivers/nvme/host/pci.c

static int nvme_pci_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val) {*val = readq(to_nvme_dev(ctrl)->bar + off);return 0; }

可能是mips這個平臺并沒有readq這個函數，尋找其他readq發現

/** Some devices and/or platforms don't advertise or work with INTx* interrupts. Pre-enable a single MSIX or MSI vec for setup. We'll* adjust this later.*/result = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);if (result < 0)return result;dev->ctrl.cap = lo_hi_readq(dev->bar + NVME_REG_CAP);

這可能是一個workaround，所以把上述代碼的readq改成lo_hi_readq即可，如下

static int nvme_pci_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val) {*val = lo_hi_readq(to_nvme_dev(ctrl)->bar + off);return 0; }

編譯openwrt并刷機啟動，果然識別到了nvme (建興T11 Plus 256G)

root@OpenWrt:/# lspci 00:00.0 PCI bridge: MEDIATEK Corp. Device 0801 (rev 01) 01:00.0 Non-Volatile memory controller: Lite-On Technology Corporation Device 5100 (rev 01) root@OpenWrt:/# ls /dev/nvme* /dev/nvme0 /dev/nvme0n1 /dev/nvme0n1p1

掛載ext4分區后，測速

root@OpenWrt:/mnt# time dd if=/dev/zero of=./640MB.bin bs=64k count=10000 conv=fsync 10000+0 records in 10000+0 records out real 0m 14.64s user 0m 0.02s sys 0m 12.72s root@OpenWrt:/mnt# time dd if=./640MB.bin of=/dev/null bs=64k count=10000 10000+0 records in 10000+0 records out real 0m 8.14s user 0m 0.02s sys 0m 7.47s

計算后，寫入速度 43.71MB/s 讀取速度 78.62MB/s，還算不錯！

總結

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