From 86ee57a97a1764e86718d5bc37d0a3a22f0c3fd5 Mon Sep 17 00:00:00 2001 From: Dick Kennedy Date: Tue, 30 Jun 2020 14:49:55 -0700 Subject: [PATCH] scsi: lpfc: Fix kdump hang on PPC When the kdump kernel shuts down lpfc calls flush_work_queue on an interrupt to schedule the cq handler. When there is only one CPU active on the kdump kernel, it is possible for the work_on to get scheduled on a non-active CPU causing it to never be scheduled. When in the kdump environment, per-CPU affinity of cq's to cpus is not necessary. In those cases, use a general queue_work rather than a queue_work_on(). Link: https://lore.kernel.org/r/20200630215001.70793-9-jsmart2021@gmail.com Signed-off-by: Dick Kennedy Signed-off-by: James Smart Signed-off-by: Martin K. Petersen --- drivers/scsi/lpfc/lpfc_sli.c | 36 ++++++++++++++++++++++++++++++------ 1 file changed, 30 insertions(+), 6 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c index 88e78ff5e0c1..4fd106ca69c7 100644 --- a/drivers/scsi/lpfc/lpfc_sli.c +++ b/drivers/scsi/lpfc/lpfc_sli.c @@ -35,6 +35,7 @@ #include #include #include +#include #ifdef CONFIG_X86 #include #endif @@ -13702,6 +13703,7 @@ lpfc_sli4_sp_handle_eqe(struct lpfc_hba *phba, struct lpfc_eqe *eqe, { struct lpfc_queue *cq = NULL, *childq; uint16_t cqid; + int ret = 0; /* Get the reference to the corresponding CQ */ cqid = bf_get_le32(lpfc_eqe_resource_id, eqe); @@ -13723,7 +13725,12 @@ lpfc_sli4_sp_handle_eqe(struct lpfc_hba *phba, struct lpfc_eqe *eqe, /* Save EQ associated with this CQ */ cq->assoc_qp = speq; - if (!queue_work_on(cq->chann, phba->wq, &cq->spwork)) + if (is_kdump_kernel()) + ret = queue_work(phba->wq, &cq->spwork); + else + ret = queue_work_on(cq->chann, phba->wq, &cq->spwork); + + if (!ret) lpfc_printf_log(phba, KERN_ERR, LOG_SLI, "0390 Cannot schedule soft IRQ " "for CQ eqcqid=%d, cqid=%d on CPU %d\n", @@ -13836,6 +13843,7 @@ __lpfc_sli4_sp_process_cq(struct lpfc_queue *cq) struct lpfc_hba *phba = cq->phba; unsigned long delay; bool workposted = false; + int ret = 0; /* Process and rearm the CQ */ switch (cq->type) { @@ -13862,8 +13870,13 @@ __lpfc_sli4_sp_process_cq(struct lpfc_queue *cq) } if (delay) { - if (!queue_delayed_work_on(cq->chann, phba->wq, - &cq->sched_spwork, delay)) + if (is_kdump_kernel()) + ret = queue_delayed_work(phba->wq, &cq->sched_spwork, + delay); + else + ret = queue_delayed_work_on(cq->chann, phba->wq, + &cq->sched_spwork, delay); + if (!ret) lpfc_printf_log(phba, KERN_ERR, LOG_SLI, "0394 Cannot schedule soft IRQ " "for cqid=%d on CPU %d\n", @@ -14215,6 +14228,7 @@ lpfc_sli4_hba_handle_eqe(struct lpfc_hba *phba, struct lpfc_queue *eq, struct lpfc_queue *cq = NULL; uint32_t qidx = eq->hdwq; uint16_t cqid, id; + int ret = 0; if (unlikely(bf_get_le32(lpfc_eqe_major_code, eqe) != 0)) { lpfc_printf_log(phba, KERN_ERR, LOG_SLI, @@ -14274,7 +14288,11 @@ work_cq: else cq->isr_timestamp = 0; #endif - if (!queue_work_on(cq->chann, phba->wq, &cq->irqwork)) + if (is_kdump_kernel()) + ret = queue_work(phba->wq, &cq->irqwork); + else + ret = queue_work_on(cq->chann, phba->wq, &cq->irqwork); + if (!ret) lpfc_printf_log(phba, KERN_ERR, LOG_SLI, "0363 Cannot schedule soft IRQ " "for CQ eqcqid=%d, cqid=%d on CPU %d\n", @@ -14302,14 +14320,20 @@ __lpfc_sli4_hba_process_cq(struct lpfc_queue *cq) struct lpfc_hba *phba = cq->phba; unsigned long delay; bool workposted = false; + int ret = 0; /* process and rearm the CQ */ workposted |= __lpfc_sli4_process_cq(phba, cq, lpfc_sli4_fp_handle_cqe, &delay); if (delay) { - if (!queue_delayed_work_on(cq->chann, phba->wq, - &cq->sched_irqwork, delay)) + if (is_kdump_kernel()) + ret = queue_delayed_work(phba->wq, &cq->sched_irqwork, + delay); + else + ret = queue_delayed_work_on(cq->chann, phba->wq, + &cq->sched_irqwork, delay); + if (!ret) lpfc_printf_log(phba, KERN_ERR, LOG_SLI, "0367 Cannot schedule soft IRQ " "for cqid=%d on CPU %d\n", -- 2.11.0