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Roman Bolshakov f02d4086a8 scsi: qla2xxx: Reserve extra IRQ vectors 
Commit a6dcfe0848 ("scsi: qla2xxx: Limit interrupt vectors to number of
CPUs") lowers the number of allocated MSI-X vectors to the number of CPUs.

That breaks vector allocation assumptions in qla83xx_iospace_config(),
qla24xx_enable_msix() and qla2x00_iospace_config(). Either of the functions
computes maximum number of qpairs as:

  ha->max_qpairs = ha->msix_count - 1 (MB interrupt) - 1 (default
                   response queue) - 1 (ATIO, in dual or pure target mode)

max_qpairs is set to zero in case of two CPUs and initiator mode. The
number is then used to allocate ha->queue_pair_map inside
qla2x00_alloc_queues(). No allocation happens and ha->queue_pair_map is
left NULL but the driver thinks there are queue pairs available.

qla2xxx_queuecommand() tries to find a qpair in the map and crashes:

  if (ha->mqenable) {
          uint32_t tag;
          uint16_t hwq;
          struct qla_qpair *qpair = NULL;

          tag = blk_mq_unique_tag(cmd->request);
          hwq = blk_mq_unique_tag_to_hwq(tag);
          qpair = ha->queue_pair_map[hwq]; # <- HERE

          if (qpair)
                  return qla2xxx_mqueuecommand(host, cmd, qpair);
  }

  BUG: kernel NULL pointer dereference, address: 0000000000000000
  #PF: supervisor read access in kernel mode
  #PF: error_code(0x0000) - not-present page
  PGD 0 P4D 0
  Oops: 0000 [#1] SMP PTI
  CPU: 0 PID: 72 Comm: kworker/u4:3 Tainted: G        W         5.10.0-rc1+ #25
  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014
  Workqueue: scsi_wq_7 fc_scsi_scan_rport [scsi_transport_fc]
  RIP: 0010:qla2xxx_queuecommand+0x16b/0x3f0 [qla2xxx]
  Call Trace:
   scsi_queue_rq+0x58c/0xa60
   blk_mq_dispatch_rq_list+0x2b7/0x6f0
   ? __sbitmap_get_word+0x2a/0x80
   __blk_mq_sched_dispatch_requests+0xb8/0x170
   blk_mq_sched_dispatch_requests+0x2b/0x50
   __blk_mq_run_hw_queue+0x49/0xb0
   __blk_mq_delay_run_hw_queue+0xfb/0x150
   blk_mq_sched_insert_request+0xbe/0x110
   blk_execute_rq+0x45/0x70
   __scsi_execute+0x10e/0x250
   scsi_probe_and_add_lun+0x228/0xda0
   __scsi_scan_target+0xf4/0x620
   ? __pm_runtime_resume+0x4f/0x70
   scsi_scan_target+0x100/0x110
   fc_scsi_scan_rport+0xa1/0xb0 [scsi_transport_fc]
   process_one_work+0x1ea/0x3b0
   worker_thread+0x28/0x3b0
   ? process_one_work+0x3b0/0x3b0
   kthread+0x112/0x130
   ? kthread_park+0x80/0x80
   ret_from_fork+0x22/0x30

The driver should allocate enough vectors to provide every CPU it's own HW
queue and still handle reserved (MB, RSP, ATIO) interrupts.

The change fixes the crash on dual core VM and prevents unbalanced QP
allocation where nr_hw_queues is two less than the number of CPUs.

Link: https://lore.kernel.org/r/20210412165740.39318-1-r.bolshakov@yadro.com
Fixes: a6dcfe0848 ("scsi: qla2xxx: Limit interrupt vectors to number of CPUs")
Cc: Daniel Wagner <daniel.wagner@suse.com>
Cc: Himanshu Madhani <himanshu.madhani@oracle.com>
Cc: Quinn Tran <qutran@marvell.com>
Cc: Nilesh Javali <njavali@marvell.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: stable@vger.kernel.org # 5.11+
Reported-by: Aleksandr Volkov <a.y.volkov@yadro.com>
Reported-by: Aleksandr Miloserdov <a.miloserdov@yadro.com>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
 		2021-04-15 22:06:03 -04:00
Documentation scsi: ufs: dt-bindings: Add sm8250, sm8350 compatible strings 2021-03-17 00:04:40 -04:00
LICENSES LICENSES: Add the CC-BY-4.0 license 2020-12-08 10:33:27 -07:00
arch ia64: don't call handle_signal() unless there's actually a signal queued 2021-03-02 17:22:11 -07:00
block scsi: blk-mq: Return budget token from .get_budget callback 2021-03-04 17:36:59 -05:00
certs certs: Replace K{U,G}IDT_INIT() with GLOBAL_ROOT_{U,G}ID 2021-01-21 16:16:10 +00:00
crypto Keyrings miscellany 2021-02-23 16:09:23 -08:00
drivers scsi: qla2xxx: Reserve extra IRQ vectors 2021-04-15 22:06:03 -04:00
fs Merge branch 'kmap-conversion-for-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux 2021-03-01 11:24:18 -08:00
include Merge branch '5.12/scsi-fixes' into 5.13/scsi-staging 2021-04-05 22:57:29 -04:00
init kbuild: fix UNUSED_KSYMS_WHITELIST for Clang LTO 2021-02-28 15:19:21 +09:00
ipc fs: make helpers idmap mount aware 2021-01-24 14:27:20 +01:00
kernel block-5.12-2021-02-27 2021-02-28 11:23:38 -08:00
lib scsi: sbitmap: Add sbitmap_calculate_shift() helper 2021-03-04 17:36:59 -05:00
mm swap: fix swapfile read/write offset 2021-03-02 17:25:46 -07:00
net io_uring-worker.v3-2021-02-25 2021-02-27 08:29:02 -08:00
samples treewide: Miguel has moved 2021-02-26 09:41:03 -08:00
scripts kbuild: do not include include/config/auto.conf from adjust_autoksyms.sh 2021-02-28 15:22:02 +09:00
security Keyrings miscellany 2021-02-23 16:09:23 -08:00
sound ARM updates for 5.12-rc1: 2021-02-22 14:27:07 -08:00
tools Tracing: Fixes for 5.12 2021-02-26 10:14:18 -08:00
usr Kbuild updates for v5.12 2021-02-25 10:17:31 -08:00
virt KVM: x86/mmu: Consider the hva in mmu_notifier retry 2021-02-22 13:16:53 -05:00
.clang-format cxl for 5.12 2021-02-24 09:38:36 -08:00
.cocciconfig
…
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore clang-lto series for v5.12-rc1 2021-02-23 09:28:51 -08:00
.mailmap treewide: Miguel has moved 2021-02-26 09:41:03 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS treewide: Miguel has moved 2021-02-26 09:41:03 -08:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS scsi: vmw_pvscsi: MAINTAINERS: Update maintainer 2021-03-04 17:21:25 -05:00
Makefile Linux 5.12-rc1 2021-02-28 16:05:19 -08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.