1. 07 Oct, 2020 1 commit
    • Luo Jiaxing's avatar
      scsi: hisi_sas: Use hisi_hba->cq_nvecs for calling calling synchronize_irq() · 7f054da7
      Luo Jiaxing authored
      A call trace is observed when running function level reset with online CPUs
      less than 16 and MSI auto-affinity enabled.
      
      [16538.348038] Call trace:
      [16538.348422]  pci_irq_vector+0x98/0xc0
      [16538.348947]  disable_host_v3_hw+0x8c/0x288 [hisi_sas_v3_hw]
      [16538.349706]  hisi_sas_reset_prepare_v3_hw+0x60/0x88 [hisi_sas_v3_hw]
      [16538.350631]  pci_dev_save_and_disable+0x38/0x68
      [16538.351290]  pci_reset_function+0x44/0x88
      [16538.351846]  reset_store+0x6c/0xb8
      [16538.352429]  dev_attr_store+0x44/0x60
      [16538.353035]  sysfs_kf_write+0x58/0x80
      [16538.353558]  kernfs_fop_write+0x140/0x230
      [16538.354175]  __vfs_write+0x48/0x80
      [16538.354675]  vfs_write+0xb8/0x1d8
      [16538.355145]  ksys_write+0x74/0xf8
      [16538.355615]  __arm64_sys_write+0x24/0x30
      [16538.356240]  el0_svc_common.constprop.4+0x80/0x1f0
      [16538.356905]  do_el0_svc+0x2c/0x38
      [16538.357408]  el0_svc+0x14/0x40
      [16538.357848]  el0_sync_handler+0xbc/0x2ec
      [16538.358388]  el0_sync+0x140/0x180
      
      The reason is that if we use pci_alloc_irq_vectors_affinity() to allocate
      IRQs, the number of CQ IRQs can only be less than or equal to the number of
      online CPUs, but we use hisi_hba->queue_count (always 16) to iterate during
      interrupt_disable_v3_hw().
      
      Use hisi_hba->cq_nvecs to replace hisi_hba->queue_count to avoid
      synchronize IRQ on a CPU which does not exist.
      
      Link: https://lore.kernel.org/r/1601649038-25534-2-git-send-email-john.garry@huawei.comSigned-off-by: default avatarLuo Jiaxing <luojiaxing@huawei.com>
      Signed-off-by: default avatarJohn Garry <john.garry@huawei.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      7f054da7
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