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synced 2024-08-21 08:19:28 +00:00
[SCSI] ipr: Reduce interrupt lock time
Reduce the amount of time the host lock is held in the interrupt handler for improved performance. [jejb: fix up checkpatch noise] Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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parent
00bfef2cc1
commit
172cd6e187
2 changed files with 47 additions and 14 deletions
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@ -565,6 +565,23 @@ static void ipr_trc_hook(struct ipr_cmnd *ipr_cmd,
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#define ipr_trc_hook(ipr_cmd, type, add_data) do { } while(0)
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#endif
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/**
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* ipr_lock_and_done - Acquire lock and complete command
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* @ipr_cmd: ipr command struct
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*
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* Return value:
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* none
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**/
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static void ipr_lock_and_done(struct ipr_cmnd *ipr_cmd)
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{
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unsigned long lock_flags;
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struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
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spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
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ipr_cmd->done(ipr_cmd);
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spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
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}
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/**
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* ipr_reinit_ipr_cmnd - Re-initialize an IPR Cmnd block for reuse
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* @ipr_cmd: ipr command struct
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@ -611,11 +628,13 @@ static void ipr_reinit_ipr_cmnd(struct ipr_cmnd *ipr_cmd)
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* Return value:
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* none
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**/
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static void ipr_init_ipr_cmnd(struct ipr_cmnd *ipr_cmd)
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static void ipr_init_ipr_cmnd(struct ipr_cmnd *ipr_cmd,
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void (*fast_done) (struct ipr_cmnd *))
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{
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ipr_reinit_ipr_cmnd(ipr_cmd);
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ipr_cmd->u.scratch = 0;
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ipr_cmd->sibling = NULL;
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ipr_cmd->fast_done = fast_done;
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init_timer(&ipr_cmd->timer);
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}
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@ -648,7 +667,7 @@ static
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struct ipr_cmnd *ipr_get_free_ipr_cmnd(struct ipr_ioa_cfg *ioa_cfg)
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{
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struct ipr_cmnd *ipr_cmd = __ipr_get_free_ipr_cmnd(ioa_cfg);
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ipr_init_ipr_cmnd(ipr_cmd);
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ipr_init_ipr_cmnd(ipr_cmd, ipr_lock_and_done);
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return ipr_cmd;
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}
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@ -5130,8 +5149,9 @@ static irqreturn_t ipr_isr(int irq, void *devp)
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u16 cmd_index;
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int num_hrrq = 0;
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int irq_none = 0;
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struct ipr_cmnd *ipr_cmd;
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struct ipr_cmnd *ipr_cmd, *temp;
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irqreturn_t rc = IRQ_NONE;
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LIST_HEAD(doneq);
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spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
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@ -5152,8 +5172,8 @@ static irqreturn_t ipr_isr(int irq, void *devp)
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if (unlikely(cmd_index >= IPR_NUM_CMD_BLKS)) {
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ipr_isr_eh(ioa_cfg, "Invalid response handle from IOA");
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spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
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return IRQ_HANDLED;
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rc = IRQ_HANDLED;
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goto unlock_out;
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}
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ipr_cmd = ioa_cfg->ipr_cmnd_list[cmd_index];
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@ -5162,9 +5182,7 @@ static irqreturn_t ipr_isr(int irq, void *devp)
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ipr_trc_hook(ipr_cmd, IPR_TRACE_FINISH, ioasc);
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list_del(&ipr_cmd->queue);
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del_timer(&ipr_cmd->timer);
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ipr_cmd->done(ipr_cmd);
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list_move_tail(&ipr_cmd->queue, &doneq);
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rc = IRQ_HANDLED;
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@ -5194,8 +5212,8 @@ static irqreturn_t ipr_isr(int irq, void *devp)
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} else if (num_hrrq == IPR_MAX_HRRQ_RETRIES &&
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int_reg & IPR_PCII_HRRQ_UPDATED) {
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ipr_isr_eh(ioa_cfg, "Error clearing HRRQ");
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spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
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return IRQ_HANDLED;
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rc = IRQ_HANDLED;
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goto unlock_out;
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} else
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break;
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}
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@ -5203,7 +5221,14 @@ static irqreturn_t ipr_isr(int irq, void *devp)
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if (unlikely(rc == IRQ_NONE))
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rc = ipr_handle_other_interrupt(ioa_cfg, int_reg);
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unlock_out:
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spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
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list_for_each_entry_safe(ipr_cmd, temp, &doneq, queue) {
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list_del(&ipr_cmd->queue);
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del_timer(&ipr_cmd->timer);
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ipr_cmd->fast_done(ipr_cmd);
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}
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return rc;
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}
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@ -5784,15 +5809,22 @@ static void ipr_scsi_done(struct ipr_cmnd *ipr_cmd)
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struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
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struct scsi_cmnd *scsi_cmd = ipr_cmd->scsi_cmd;
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u32 ioasc = be32_to_cpu(ipr_cmd->s.ioasa.hdr.ioasc);
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unsigned long lock_flags;
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scsi_set_resid(scsi_cmd, be32_to_cpu(ipr_cmd->s.ioasa.hdr.residual_data_len));
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if (likely(IPR_IOASC_SENSE_KEY(ioasc) == 0)) {
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scsi_dma_unmap(ipr_cmd->scsi_cmd);
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scsi_dma_unmap(scsi_cmd);
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spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
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list_add_tail(&ipr_cmd->queue, &ioa_cfg->free_q);
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scsi_cmd->scsi_done(scsi_cmd);
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} else
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spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
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} else {
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spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
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ipr_erp_start(ioa_cfg, ipr_cmd);
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spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
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}
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}
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/**
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@ -5848,12 +5880,12 @@ static int ipr_queuecommand(struct Scsi_Host *shost,
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ipr_cmd = __ipr_get_free_ipr_cmnd(ioa_cfg);
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spin_unlock_irqrestore(shost->host_lock, lock_flags);
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ipr_init_ipr_cmnd(ipr_cmd);
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ipr_init_ipr_cmnd(ipr_cmd, ipr_scsi_done);
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ioarcb = &ipr_cmd->ioarcb;
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memcpy(ioarcb->cmd_pkt.cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
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ipr_cmd->scsi_cmd = scsi_cmd;
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ipr_cmd->done = ipr_scsi_done;
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ipr_cmd->done = ipr_scsi_eh_done;
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if (ipr_is_gscsi(res) || ipr_is_vset_device(res)) {
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if (scsi_cmd->underflow == 0)
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@ -1525,6 +1525,7 @@ struct ipr_cmnd {
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struct ata_queued_cmd *qc;
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struct completion completion;
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struct timer_list timer;
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void (*fast_done) (struct ipr_cmnd *);
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void (*done) (struct ipr_cmnd *);
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int (*job_step) (struct ipr_cmnd *);
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int (*job_step_failed) (struct ipr_cmnd *);
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