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[SCSI] be2iscsi: Fix kernel panic in blk_iopoll disable mode.

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Kernel used to panic while running IO is disable mode, as there
was an issue with getting the correct EQ on which completion has come.
Fix done is create workqueue per hba and work item for each EQ created.

Signed-off-by: John Soni Jose <sony.john-n@emulex.com>
Signed-off-by: Jayamohan Kallickal <jayamohan.kallickal@emulex.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
John Soni Jose 2012-10-20 04:42:49 +05:30 committed by James Bottomley
parent 4d4d1ef8cb
commit 72fb46a9d5
3 changed files with 52 additions and 37 deletions
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3
drivers/scsi/be2iscsi/be.h
View file

@ -84,9 +84,12 @@ static inline void queue_tail_inc(struct be_queue_info *q)
/*ISCSI */
struct be_eq_obj {
bool todo_mcc_cq;
bool todo_cq;
struct be_queue_info q;
struct beiscsi_hba *phba;
struct be_queue_info *cq;
struct work_struct work_cqs; /* Work Item */
struct blk_iopoll iopoll;
};

83
drivers/scsi/be2iscsi/be_main.c
View file

@ -769,7 +769,7 @@ static irqreturn_t be_isr_mcc(int irq, void *dev_id)
resource_id) / 32] &
EQE_RESID_MASK) >> 16) == mcc->id) {
spin_lock_irqsave(&phba->isr_lock, flags);
phba->todo_mcc_cq = 1;
pbe_eq->todo_mcc_cq = true;
spin_unlock_irqrestore(&phba->isr_lock, flags);
}
AMAP_SET_BITS(struct amap_eq_entry, valid, eqe, 0);
@ -777,8 +777,8 @@ static irqreturn_t be_isr_mcc(int irq, void *dev_id)
eqe = queue_tail_node(eq);
num_eq_processed++;
}
if (phba->todo_mcc_cq)
queue_work(phba->wq, &phba->work_cqs);
if (pbe_eq->todo_mcc_cq)
queue_work(phba->wq, &pbe_eq->work_cqs);
if (num_eq_processed)
hwi_ring_eq_db(phba, eq->id, 1, num_eq_processed, 1, 1);
@ -818,29 +818,26 @@ static irqreturn_t be_isr_msix(int irq, void *dev_id)
eqe = queue_tail_node(eq);
num_eq_processed++;
}
if (num_eq_processed)
hwi_ring_eq_db(phba, eq->id, 1, num_eq_processed, 0, 1);
return IRQ_HANDLED;
} else {
while (eqe->dw[offsetof(struct amap_eq_entry, valid) / 32]
& EQE_VALID_MASK) {
spin_lock_irqsave(&phba->isr_lock, flags);
phba->todo_cq = 1;
pbe_eq->todo_cq = true;
spin_unlock_irqrestore(&phba->isr_lock, flags);
AMAP_SET_BITS(struct amap_eq_entry, valid, eqe, 0);
queue_tail_inc(eq);
eqe = queue_tail_node(eq);
num_eq_processed++;
}
if (phba->todo_cq)
queue_work(phba->wq, &phba->work_cqs);
if (num_eq_processed)
hwi_ring_eq_db(phba, eq->id, 1, num_eq_processed, 1, 1);
return IRQ_HANDLED;
if (pbe_eq->todo_cq)
queue_work(phba->wq, &pbe_eq->work_cqs);
}
if (num_eq_processed)
hwi_ring_eq_db(phba, eq->id, 1, num_eq_processed, 0, 1);
return IRQ_HANDLED;
}
/**
@ -888,7 +885,7 @@ static irqreturn_t be_isr(int irq, void *dev_id)
resource_id) / 32] &
EQE_RESID_MASK) >> 16) == mcc->id) {
spin_lock_irqsave(&phba->isr_lock, flags);
phba->todo_mcc_cq = 1;
pbe_eq->todo_mcc_cq = true;
spin_unlock_irqrestore(&phba->isr_lock, flags);
num_mcceq_processed++;
} else {
@ -901,8 +898,8 @@ static irqreturn_t be_isr(int irq, void *dev_id)
eqe = queue_tail_node(eq);
}
if (num_ioeq_processed || num_mcceq_processed) {
if (phba->todo_mcc_cq)
queue_work(phba->wq, &phba->work_cqs);
if (pbe_eq->todo_mcc_cq)
queue_work(phba->wq, &pbe_eq->work_cqs);
if ((num_mcceq_processed) && (!num_ioeq_processed))
hwi_ring_eq_db(phba, eq->id, 0,
@ -925,11 +922,11 @@ static irqreturn_t be_isr(int irq, void *dev_id)
resource_id) / 32] &
EQE_RESID_MASK) >> 16) != cq->id) {
spin_lock_irqsave(&phba->isr_lock, flags);
phba->todo_mcc_cq = 1;
pbe_eq->todo_mcc_cq = true;
spin_unlock_irqrestore(&phba->isr_lock, flags);
} else {
spin_lock_irqsave(&phba->isr_lock, flags);
phba->todo_cq = 1;
pbe_eq->todo_cq = true;
spin_unlock_irqrestore(&phba->isr_lock, flags);
}
AMAP_SET_BITS(struct amap_eq_entry, valid, eqe, 0);
@ -937,8 +934,8 @@ static irqreturn_t be_isr(int irq, void *dev_id)
eqe = queue_tail_node(eq);
num_ioeq_processed++;
}
if (phba->todo_cq || phba->todo_mcc_cq)
queue_work(phba->wq, &phba->work_cqs);
if (pbe_eq->todo_cq || pbe_eq->todo_mcc_cq)
queue_work(phba->wq, &pbe_eq->work_cqs);
if (num_ioeq_processed) {
hwi_ring_eq_db(phba, eq->id, 0,
@ -2108,30 +2105,30 @@ void beiscsi_process_all_cqs(struct work_struct *work)
unsigned long flags;
struct hwi_controller *phwi_ctrlr;
struct hwi_context_memory *phwi_context;
struct be_eq_obj *pbe_eq;
struct beiscsi_hba *phba =
container_of(work, struct beiscsi_hba, work_cqs);
struct beiscsi_hba *phba;
struct be_eq_obj *pbe_eq =
container_of(work, struct be_eq_obj, work_cqs);
phba = pbe_eq->phba;
phwi_ctrlr = phba->phwi_ctrlr;
phwi_context = phwi_ctrlr->phwi_ctxt;
if (phba->msix_enabled)
pbe_eq = &phwi_context->be_eq[phba->num_cpus];
else
pbe_eq = &phwi_context->be_eq[0];
if (phba->todo_mcc_cq) {
if (pbe_eq->todo_mcc_cq) {
spin_lock_irqsave(&phba->isr_lock, flags);
phba->todo_mcc_cq = 0;
pbe_eq->todo_mcc_cq = false;
spin_unlock_irqrestore(&phba->isr_lock, flags);
beiscsi_process_mcc_isr(phba);
}
if (phba->todo_cq) {
if (pbe_eq->todo_cq) {
spin_lock_irqsave(&phba->isr_lock, flags);
phba->todo_cq = 0;
pbe_eq->todo_cq = false;
spin_unlock_irqrestore(&phba->isr_lock, flags);
beiscsi_process_cq(pbe_eq);
}
/* rearm EQ for further interrupts */
hwi_ring_eq_db(phba, pbe_eq->q.id, 0, 0, 1, 1);
}
static int be_iopoll(struct blk_iopoll *iop, int budget)
@ -4642,7 +4639,7 @@ static int __devinit beiscsi_dev_probe(struct pci_dev *pcidev,
phba->ctrl.mcc_alloc_index = phba->ctrl.mcc_free_index = 0;
snprintf(phba->wq_name, sizeof(phba->wq_name), "beiscsi_q_irq%u",
snprintf(phba->wq_name, sizeof(phba->wq_name), "beiscsi_%02x_wq",
phba->shost->host_no);
phba->wq = alloc_workqueue(phba->wq_name, WQ_MEM_RECLAIM, 1);
if (!phba->wq) {
@ -4652,10 +4649,10 @@ static int __devinit beiscsi_dev_probe(struct pci_dev *pcidev,
goto free_twq;
}
INIT_WORK(&phba->work_cqs, beiscsi_process_all_cqs);
phwi_ctrlr = phba->phwi_ctrlr;
phwi_context = phwi_ctrlr->phwi_ctxt;
if (blk_iopoll_enabled) {
for (i = 0; i < phba->num_cpus; i++) {
pbe_eq = &phwi_context->be_eq[i];
@ -4663,7 +4660,25 @@ static int __devinit beiscsi_dev_probe(struct pci_dev *pcidev,
be_iopoll);
blk_iopoll_enable(&pbe_eq->iopoll);
}
i = (phba->msix_enabled) ? i : 0;
/* Work item for MCC handling */
pbe_eq = &phwi_context->be_eq[i];
INIT_WORK(&pbe_eq->work_cqs, beiscsi_process_all_cqs);
} else {
if (phba->msix_enabled) {
for (i = 0; i <= phba->num_cpus; i++) {
pbe_eq = &phwi_context->be_eq[i];
INIT_WORK(&pbe_eq->work_cqs,
beiscsi_process_all_cqs);
}
} else {
pbe_eq = &phwi_context->be_eq[0];
INIT_WORK(&pbe_eq->work_cqs,
beiscsi_process_all_cqs);
}
}
ret = beiscsi_init_irqs(phba);
if (ret < 0) {
beiscsi_log(phba, KERN_ERR, BEISCSI_LOG_INIT,

3
drivers/scsi/be2iscsi/be_main.h
View file

@ -327,11 +327,8 @@ struct beiscsi_hba {
} fw_config;
u8 mac_address[ETH_ALEN];
unsigned short todo_cq;
unsigned short todo_mcc_cq;
char wq_name[20];
struct workqueue_struct *wq; /* The actuak work queue */
struct work_struct work_cqs; /* The work being queued */
struct be_ctrl_info ctrl;
unsigned int generation;
unsigned int interface_handle;