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Message-ID: <CH2PR19MB4024E04EBD0E4958F0BBB2ACA0809@CH2PR19MB4024.namprd19.prod.outlook.com>
Date: Fri, 22 Oct 2021 10:08:20 +0000
From: Li Chen <lchen@...arella.com>
To: "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
CC: Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Rob Herring <robh@...nel.org>, "kw@...ux.com" <kw@...ux.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: nvme may get timeout from dd when using different non-prefetch mmio
outbound/ranges
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:
# 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@...0000000 {
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?).
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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