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linux/Documentation/fault-injection/nvme-fault-injection.rst

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docs: fault-injection: convert docs to ReST and rename to *.rst The conversion is actually: - add blank lines and identation in order to identify paragraphs; - fix tables markups; - add some lists markups; - mark literal blocks; - adjust title markups. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Acked-by: Federico Vaga <federico.vaga@vaga.pv.it> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2019-06-13 01:52:44 +08:00
NVMe Fault Injection
====================
Linux's fault injection framework provides a systematic way to support
error injection via debugfs in the /sys/kernel/debug directory. When
enabled, the default NVME_SC_INVALID_OPCODE with no retry will be
injected into the nvme_end_request. Users can change the default status
code and no retry flag via the debugfs. The list of Generic Command
Status can be found in include/linux/nvme.h
Following examples show how to inject an error into the nvme.
First, enable CONFIG_FAULT_INJECTION_DEBUG_FS kernel config,
recompile the kernel. After booting up the kernel, do the
following.
Example 1: Inject default status code with no retry
---------------------------------------------------
::
mount /dev/nvme0n1 /mnt
echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/times
echo 100 > /sys/kernel/debug/nvme0n1/fault_inject/probability
cp a.file /mnt
Expected Result::
cp: cannot stat ‘/mnt/a.file’: Input/output error
Message from dmesg::
FAULT_INJECTION: forcing a failure.
name fault_inject, interval 1, probability 100, space 0, times 1
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.15.0-rc8+ #2
Hardware name: innotek GmbH VirtualBox/VirtualBox,
BIOS VirtualBox 12/01/2006
Call Trace:
<IRQ>
dump_stack+0x5c/0x7d
should_fail+0x148/0x170
nvme_should_fail+0x2f/0x50 [nvme_core]
nvme_process_cq+0xe7/0x1d0 [nvme]
nvme_irq+0x1e/0x40 [nvme]
__handle_irq_event_percpu+0x3a/0x190
handle_irq_event_percpu+0x30/0x70
handle_irq_event+0x36/0x60
handle_fasteoi_irq+0x78/0x120
handle_irq+0xa7/0x130
? tick_irq_enter+0xa8/0xc0
do_IRQ+0x43/0xc0
common_interrupt+0xa2/0xa2
</IRQ>
RIP: 0010:native_safe_halt+0x2/0x10
RSP: 0018:ffffffff82003e90 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffdd
RAX: ffffffff817a10c0 RBX: ffffffff82012480 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 000000008e38ce64 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff82012480
R13: ffffffff82012480 R14: 0000000000000000 R15: 0000000000000000
? __sched_text_end+0x4/0x4
default_idle+0x18/0xf0
do_idle+0x150/0x1d0
cpu_startup_entry+0x6f/0x80
start_kernel+0x4c4/0x4e4
? set_init_arg+0x55/0x55
secondary_startup_64+0xa5/0xb0
print_req_error: I/O error, dev nvme0n1, sector 9240
EXT4-fs error (device nvme0n1): ext4_find_entry:1436:
inode #2: comm cp: reading directory lblock 0
Example 2: Inject default status code with retry
------------------------------------------------
::
mount /dev/nvme0n1 /mnt
echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/times
echo 100 > /sys/kernel/debug/nvme0n1/fault_inject/probability
echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/status
echo 0 > /sys/kernel/debug/nvme0n1/fault_inject/dont_retry
cp a.file /mnt
Expected Result::
command success without error
Message from dmesg::
FAULT_INJECTION: forcing a failure.
name fault_inject, interval 1, probability 100, space 0, times 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0-rc8+ #4
Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
Call Trace:
<IRQ>
dump_stack+0x5c/0x7d
should_fail+0x148/0x170
nvme_should_fail+0x30/0x60 [nvme_core]
nvme_loop_queue_response+0x84/0x110 [nvme_loop]
nvmet_req_complete+0x11/0x40 [nvmet]
nvmet_bio_done+0x28/0x40 [nvmet]
blk_update_request+0xb0/0x310
blk_mq_end_request+0x18/0x60
flush_smp_call_function_queue+0x3d/0xf0
smp_call_function_single_interrupt+0x2c/0xc0
call_function_single_interrupt+0xa2/0xb0
</IRQ>
RIP: 0010:native_safe_halt+0x2/0x10
RSP: 0018:ffffc9000068bec0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff04
RAX: ffffffff817a10c0 RBX: ffff88011a3c9680 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 000000008e38c131 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88011a3c9680
R13: ffff88011a3c9680 R14: 0000000000000000 R15: 0000000000000000
? __sched_text_end+0x4/0x4
default_idle+0x18/0xf0
do_idle+0x150/0x1d0
cpu_startup_entry+0x6f/0x80
start_secondary+0x187/0x1e0
secondary_startup_64+0xa5/0xb0
It's been a relatively busy cycle for docs: - A fair pile of RST conversions, many from Mauro. These create more than the usual number of simple but annoying merge conflicts with other trees, unfortunately. He has a lot more of these waiting on the wings that, I think, will go to you directly later on. - A new document on how to use merges and rebases in kernel repos, and one on Spectre vulnerabilities. - Various improvements to the build system, including automatic markup of function() references because some people, for reasons I will never understand, were of the opinion that :c:func:``function()`` is unattractive and not fun to type. - We now recommend using sphinx 1.7, but still support back to 1.4. - Lots of smaller improvements, warning fixes, typo fixes, etc. -----BEGIN PGP SIGNATURE----- iQFDBAABCAAtFiEEIw+MvkEiF49krdp9F0NaE2wMflgFAl0krAEPHGNvcmJldEBs d24ubmV0AAoJEBdDWhNsDH5Yg98H/AuLqO9LpOgUjF4LhyjxGPdzJkY9RExSJ7km gznyreLCZgFaJR+AY6YDsd4Jw6OJlPbu1YM/Qo3C3WrZVFVhgL/s2ebvBgCo50A8 raAFd8jTf4/mGCHnAqRotAPQ3mETJUk315B66lBJ6Oc+YdpRhwXWq8ZW2bJxInFF 3HDvoFgMf0KhLuMHUkkL0u3fxH1iA+KvDu8diPbJYFjOdOWENz/CV8wqdVkXRSEW DJxIq89h/7d+hIG3d1I7Nw+gibGsAdjSjKv4eRKauZs4Aoxd1Gpl62z0JNk6aT3m dtq4joLdwScydonXROD/Twn2jsu4xYTrPwVzChomElMowW/ZBBY= =D0eO -----END PGP SIGNATURE----- Merge tag 'docs-5.3' of git://git.lwn.net/linux Pull Documentation updates from Jonathan Corbet: "It's been a relatively busy cycle for docs: - A fair pile of RST conversions, many from Mauro. These create more than the usual number of simple but annoying merge conflicts with other trees, unfortunately. He has a lot more of these waiting on the wings that, I think, will go to you directly later on. - A new document on how to use merges and rebases in kernel repos, and one on Spectre vulnerabilities. - Various improvements to the build system, including automatic markup of function() references because some people, for reasons I will never understand, were of the opinion that :c:func:``function()`` is unattractive and not fun to type. - We now recommend using sphinx 1.7, but still support back to 1.4. - Lots of smaller improvements, warning fixes, typo fixes, etc" * tag 'docs-5.3' of git://git.lwn.net/linux: (129 commits) docs: automarkup.py: ignore exceptions when seeking for xrefs docs: Move binderfs to admin-guide Disable Sphinx SmartyPants in HTML output doc: RCU callback locks need only _bh, not necessarily _irq docs: format kernel-parameters -- as code Doc : doc-guide : Fix a typo platform: x86: get rid of a non-existent document Add the RCU docs to the core-api manual Documentation: RCU: Add TOC tree hooks Documentation: RCU: Rename txt files to rst Documentation: RCU: Convert RCU UP systems to reST Documentation: RCU: Convert RCU linked list to reST Documentation: RCU: Convert RCU basic concepts to reST docs: filesystems: Remove uneeded .rst extension on toctables scripts/sphinx-pre-install: fix out-of-tree build docs: zh_CN: submitting-drivers.rst: Remove a duplicated Documentation/ Documentation: PGP: update for newer HW devices Documentation: Add section about CPU vulnerabilities for Spectre Documentation: platform: Delete x86-laptop-drivers.txt docs: Note that :c:func: should no longer be used ...
2019-07-10 03:34:26 +08:00
Example 3: Inject an error into the 10th admin command
------------------------------------------------------
::
echo 100 > /sys/kernel/debug/nvme0/fault_inject/probability
echo 10 > /sys/kernel/debug/nvme0/fault_inject/space
echo 1 > /sys/kernel/debug/nvme0/fault_inject/times
nvme reset /dev/nvme0
Expected Result::
After NVMe controller reset, the reinitialization may or may not succeed.
It depends on which admin command is actually forced to fail.
Message from dmesg::
nvme nvme0: resetting controller
FAULT_INJECTION: forcing a failure.
name fault_inject, interval 1, probability 100, space 1, times 1
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.2.0-rc2+ #2
Hardware name: MSI MS-7A45/B150M MORTAR ARCTIC (MS-7A45), BIOS 1.50 04/25/2017
Call Trace:
<IRQ>
dump_stack+0x63/0x85
should_fail+0x14a/0x170
nvme_should_fail+0x38/0x80 [nvme_core]
nvme_irq+0x129/0x280 [nvme]
? blk_mq_end_request+0xb3/0x120
__handle_irq_event_percpu+0x84/0x1a0
handle_irq_event_percpu+0x32/0x80
handle_irq_event+0x3b/0x60
handle_edge_irq+0x7f/0x1a0
handle_irq+0x20/0x30
do_IRQ+0x4e/0xe0
common_interrupt+0xf/0xf
</IRQ>
RIP: 0010:cpuidle_enter_state+0xc5/0x460
Code: ff e8 8f 5f 86 ff 80 7d c7 00 74 17 9c 58 0f 1f 44 00 00 f6 c4 02 0f 85 69 03 00 00 31 ff e8 62 aa 8c ff fb 66 0f 1f 44 00 00 <45> 85 ed 0f 88 37 03 00 00 4c 8b 45 d0 4c 2b 45 b8 48 ba cf f7 53
RSP: 0018:ffffffff88c03dd0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffdc
RAX: ffff9dac25a2ac80 RBX: ffffffff88d53760 RCX: 000000000000001f
RDX: 0000000000000000 RSI: 000000002d958403 RDI: 0000000000000000
RBP: ffffffff88c03e18 R08: fffffff75e35ffb7 R09: 00000a49a56c0b48
R10: ffffffff88c03da0 R11: 0000000000001b0c R12: ffff9dac25a34d00
R13: 0000000000000006 R14: 0000000000000006 R15: ffffffff88d53760
cpuidle_enter+0x2e/0x40
call_cpuidle+0x23/0x40
do_idle+0x201/0x280
cpu_startup_entry+0x1d/0x20
rest_init+0xaa/0xb0
arch_call_rest_init+0xe/0x1b
start_kernel+0x51c/0x53b
x86_64_start_reservations+0x24/0x26
x86_64_start_kernel+0x74/0x77
secondary_startup_64+0xa4/0xb0
nvme nvme0: Could not set queue count (16385)
nvme nvme0: IO queues not created