[+cc Tom (Cadence maintainer), NVMe folks]
On Fri, Oct 22, 2021 at 10:08:20AM +0000, Li Chen wrote:
> Hi, all
>
> I found my nvme may get timeout with simply dd, the pcie controller
> is cadence, and the pcie-controller platform I use is
> pcie-cadence-host.c, kenrel version is 5.10.32:
Given that nvme is pretty widely used, I tend to suspect the cadence
driver or DTS here, but I added both cadence and nvme folks to the CC:
list.
> # dd if=/dev/urandom of=/dev/nvme0n1 bs=4k count=1024000
> [ 41.913484][ T274] urandom_read: 2 callbacks suppressed
> [ 41.913490][ T274] random: dd: uninitialized urandom read (4096 bytes read)
> [ 41.926130][ T274] random: dd: uninitialized urandom read (4096 bytes read)
> [ 41.933348][ T274] random: dd: uninitialized urandom read (4096 bytes read)
> [ 47.651842][ C0] random: crng init done
> [ 47.655963][ C0] random: 2 urandom warning(s) missed due to ratelimiting
> [ 81.448128][ T64] nvme nvme0: controller is down; will reset: CSTS=0x3, PCI_STATUS=0x2010
> [ 81.481139][ T7] nvme 0000:05:00.0: enabling bus mastering
> [ 81.486946][ T7] nvme 0000:05:00.0: saving config space at offset 0x0 (reading 0xa809144d)
> [ 81.495517][ T7] nvme 0000:05:00.0: saving config space at offset 0x4 (reading 0x20100006)
> [ 81.504091][ T7] nvme 0000:05:00.0: saving config space at offset 0x8 (reading 0x1080200)
> [ 81.512571][ T7] nvme 0000:05:00.0: saving config space at offset 0xc (reading 0x0)
> [ 81.520527][ T7] nvme 0000:05:00.0: saving config space at offset 0x10 (reading 0x8000004)
> [ 81.529094][ T7] nvme 0000:05:00.0: saving config space at offset 0x14 (reading 0x0)
> [ 81.537138][ T7] nvme 0000:05:00.0: saving config space at offset 0x18 (reading 0x0)
> [ 81.545186][ T7] nvme 0000:05:00.0: saving config space at offset 0x1c (reading 0x0)
> [ 81.553252][ T7] nvme 0000:05:00.0: saving config space at offset 0x20 (reading 0x0)
> [ 81.561296][ T7] nvme 0000:05:00.0: saving config space at offset 0x24 (reading 0x0)
> [ 81.569340][ T7] nvme 0000:05:00.0: saving config space at offset 0x28 (reading 0x0)
> [ 81.577384][ T7] nvme 0000:05:00.0: saving config space at offset 0x2c (reading 0xa801144d)
> [ 81.586038][ T7] nvme 0000:05:00.0: saving config space at offset 0x30 (reading 0x0)
> [ 81.594081][ T7] nvme 0000:05:00.0: saving config space at offset 0x34 (reading 0x40)
> [ 81.602217][ T7] nvme 0000:05:00.0: saving config space at offset 0x38 (reading 0x0)
> [ 81.610266][ T7] nvme 0000:05:00.0: saving config space at offset 0x3c (reading 0x12c)
> [ 81.634065][ T7] nvme nvme0: Shutdown timeout set to 8 seconds
> [ 81.674332][ T7] nvme nvme0: 1/0/0 default/read/poll queues
> [ 112.168136][ T256] nvme nvme0: I/O 12 QID 1 timeout, disable controller
> [ 112.193145][ T256] blk_update_request: I/O error, dev nvme0n1, sector 600656 op 0x1:(WRITE) flags 0x104000 phys_seg 127 prio class 0
> [ 112.205220][ T256] Buffer I/O error on dev nvme0n1, logical block 75082, lost async page write
> [ 112.213978][ T256] Buffer I/O error on dev nvme0n1, logical block 75083, lost async page write
> [ 112.222727][ T256] Buffer I/O error on dev nvme0n1, logical block 75084, lost async page write
> [ 112.231474][ T256] Buffer I/O error on dev nvme0n1, logical block 75085, lost async page write
> [ 112.240220][ T256] Buffer I/O error on dev nvme0n1, logical block 75086, lost async page write
> [ 112.248966][ T256] Buffer I/O error on dev nvme0n1, logical block 75087, lost async page write
> [ 112.257719][ T256] Buffer I/O error on dev nvme0n1, logical block 75088, lost async page write
> [ 112.266467][ T256] Buffer I/O error on dev nvme0n1, logical block 75089, lost async page write
> [ 112.275213][ T256] Buffer I/O error on dev nvme0n1, logical block 75090, lost async page write
> [ 112.283959][ T256] Buffer I/O error on dev nvme0n1, logical block 75091, lost async page write
> [ 112.293554][ T256] blk_update_request: I/O error, dev nvme0n1, sector 601672 op 0x1:(WRITE) flags 0x104000 phys_seg 127 prio class 0
> [ 112.306559][ T256] blk_update_request: I/O error, dev nvme0n1, sector 602688 op 0x1:(WRITE) flags 0x104000 phys_seg 127 prio class 0
> [ 112.319525][ T256] blk_update_request: I/O error, dev nvme0n1, sector 603704 op 0x1:(WRITE) flags 0x104000 phys_seg 127 prio class 0
> [ 112.332501][ T256] blk_update_request: I/O error, dev nvme0n1, sector 604720 op 0x1:(WRITE) flags 0x104000 phys_seg 127 prio class 0
> [ 112.345466][ T256] blk_update_request: I/O error, dev nvme0n1, sector 605736 op 0x1:(WRITE) flags 0x104000 phys_seg 127 prio class 0
> [ 112.358427][ T256] blk_update_request: I/O error, dev nvme0n1, sector 606752 op 0x1:(WRITE) flags 0x104000 phys_seg 127 prio class 0
> [ 112.371386][ T256] blk_update_request: I/O error, dev nvme0n1, sector 607768 op 0x1:(WRITE) flags 0x104000 phys_seg 127 prio class 0
> [ 112.384346][ T256] blk_update_request: I/O error, dev nvme0n1, sector 608784 op 0x1:(WRITE) flags 0x104000 phys_seg 127 prio class 0
> [ 112.397315][ T256] blk_update_request: I/O error, dev nvme0n1, sector 609800 op 0x1:(WRITE) flags 0x104000 phys_seg 127 prio class 0
> [ 112.459313][ T7] nvme nvme0: failed to mark controller live state
> [ 112.465758][ T7] nvme nvme0: Removing after probe failure status: -19
> dd: error writing '/dev/nvme0n1': No space left on device
> 112200+0 records in
> 112199+0 records out
> 459567104 bytes (438.3MB) copied, 70.573266 seconds, 6.2MB/s
> # [ 112.935768][ T7] nvme nvme0: failed to set APST feature (-19)
>
>
>
>
> Here is the dts I used:
> pciec: pcie-controller@2040000000 {
> compatible = "cdns,cdns-pcie-host";
> device_type = "pci";
> #address-cells = <3>;
> #size-cells = <2>;
> bus-range = <0 5>;
> linux,pci-domain = <0>;
> cdns,no-bar-match-nbits = <38>;
> vendor-id = <0x17cd>;
> device-id = <0x0100>;
> reg-names = "reg", "cfg";
> reg = <0x20 0x40000000 0x0 0x10000000>,
> <0x20 0x00000000 0x0 0x00001000>; /* RC only */
>
> /*
> * type: 0x00000000 cfg space
> * type: 0x01000000 IO
> * type: 0x02000000 32bit mem space No prefetch
> * type: 0x03000000 64bit mem space No prefetch
> * type: 0x43000000 64bit mem space prefetch
> * The First 16MB from BUS_DEV_FUNC=0:0:0 for cfg space
> * <0x00000000 0x00 0x00000000 0x20 0x00000000 0x00 0x01000000>, CFG_SPACE
> */
> ranges = <0x01000000 0x00 0x00000000 0x20 0x00100000 0x00 0x00100000>,
> <0x02000000 0x00 0x08000000 0x20 0x08000000 0x00 0x08000000>;
>
> #interrupt-cells = <0x1>;
> interrupt-map-mask = <0x00 0x0 0x0 0x7>;
> interrupt-map = <0x0 0x0 0x0 0x1 &gic 0 229 0x4>,
> <0x0 0x0 0x0 0x2 &gic 0 230 0x4>,
> <0x0 0x0 0x0 0x3 &gic 0 231 0x4>,
> <0x0 0x0 0x0 0x4 &gic 0 232 0x4>;
> phys = <&pcie_phy>;
> phy-names="pcie-phy";
> status = "ok";
> };
>
>
> After some digging, I find if I change the controller's range
> property from
>
> <0x02000000 0x00 0x08000000 0x20 0x08000000 0x00 0x08000000> into
> <0x02000000 0x00 0x00400000 0x20 0x00400000 0x00 0x08000000>,
>
> then dd will success without timeout. IIUC, range here
> is only for non-prefetch 32bit mmio, but dd will use dma (maybe cpu
> will send cmd to nvme controller via mmio?).
I don't know how to interpret "ranges". Can you supply the dmesg and
"lspci -vvs 0000:05:00.0" output both ways, e.g.,
pci_bus 0000:00: root bus resource [mem 0x7f800000-0xefffffff window]
pci_bus 0000:00: root bus resource [mem 0xfd000000-0xfe7fffff window]
pci 0000:05:00.0: [vvvv:dddd] type 00 class 0x...
pci 0000:05:00.0: reg 0x10: [mem 0x.....000-0x.....fff ...]
> Question:
> 1. Why dd can cause nvme timeout? Is there more debug ways?
> 2. How can this mmio range affect nvme timeout?
>
> Regards,
> Li
>
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