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Commit 3feeb89d authored by Wayne Boyer's avatar Wayne Boyer Committed by James Bottomley
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[SCSI] ipr: add workaround for MSI interrupts on P7 



This patch adds some additional logic to the interrupt service routine to fix
a potential problem where an MSI interrupt does not get cleared the first time.

Signed-off-by: default avatarWayne Boyer <wayneb@linux.vnet.ibm.com>
Acked-by: default avatarBrian King <brking@linux.vnet.ibm.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
parent 61ec33eb

drivers/scsi/ipr.c

+33 −9
Original line number Diff line number Diff line
@@ -4188,6 +4188,25 @@ static irqreturn_t ipr_handle_other_interrupt(struct ipr_ioa_cfg *ioa_cfg, 
	return rc;

}



/**

 * ipr_isr_eh - Interrupt service routine error handler

 * @ioa_cfg:	ioa config struct

 * @msg:	message to log

 *

 * Return value:

 * 	none

 **/

static void ipr_isr_eh(struct ipr_ioa_cfg *ioa_cfg, char *msg)

{

	ioa_cfg->errors_logged++;

	dev_err(&ioa_cfg->pdev->dev, "%s\n", msg);



	if (WAIT_FOR_DUMP == ioa_cfg->sdt_state)

		ioa_cfg->sdt_state = GET_DUMP;



	ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NONE);

}



/**

 * ipr_isr - Interrupt service routine

 * @irq:	irq number
@@ -4203,6 +4222,7 @@ static irqreturn_t ipr_isr(int irq, void *devp) 
	volatile u32 int_reg, int_mask_reg;

	u32 ioasc;

	u16 cmd_index;

	int num_hrrq = 0;

	struct ipr_cmnd *ipr_cmd;

	irqreturn_t rc = IRQ_NONE;
@@ -4233,13 +4253,7 @@ static irqreturn_t ipr_isr(int irq, void *devp) 
				     IPR_HRRQ_REQ_RESP_HANDLE_MASK) >> IPR_HRRQ_REQ_RESP_HANDLE_SHIFT;



			if (unlikely(cmd_index >= IPR_NUM_CMD_BLKS)) {

				ioa_cfg->errors_logged++;

				dev_err(&ioa_cfg->pdev->dev, "Invalid response handle from IOA\n");



				if (WAIT_FOR_DUMP == ioa_cfg->sdt_state)

					ioa_cfg->sdt_state = GET_DUMP;



				ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NONE);

				ipr_isr_eh(ioa_cfg, "Invalid response handle from IOA");

				spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);

				return IRQ_HANDLED;

			}
@@ -4266,8 +4280,18 @@ static irqreturn_t ipr_isr(int irq, void *devp) 


		if (ipr_cmd != NULL) {

			/* Clear the PCI interrupt */

			do {

				writel(IPR_PCII_HRRQ_UPDATED, ioa_cfg->regs.clr_interrupt_reg);

				int_reg = readl(ioa_cfg->regs.sense_interrupt_reg) & ~int_mask_reg;

			} while (int_reg & IPR_PCII_HRRQ_UPDATED &&

					num_hrrq++ < IPR_MAX_HRRQ_RETRIES);



			if (int_reg & IPR_PCII_HRRQ_UPDATED) {

				ipr_isr_eh(ioa_cfg, "Error clearing HRRQ");

				spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);

				return IRQ_HANDLED;

			}



		} else

			break;

	}

drivers/scsi/ipr.h

+1 −0
Original line number Diff line number Diff line
@@ -144,6 +144,7 @@ 
#define IPR_IOA_MAX_SECTORS				32767

#define IPR_VSET_MAX_SECTORS				512

#define IPR_MAX_CDB_LEN					16

#define IPR_MAX_HRRQ_RETRIES				3



#define IPR_DEFAULT_BUS_WIDTH				16

#define IPR_80MBs_SCSI_RATE		((80 * 10) / (IPR_DEFAULT_BUS_WIDTH / 8))