scsi: cxlflash: Implement IRQ polling for RRQ processing
Currently, RRQ processing takes place on hardware interrupt context. This can
be a heavy burden in some environments due to the overhead encountered while
completing RRQ entries. In an effort to improve system performance, use the
IRQ polling API to schedule this processing on softirq context.
This function will be disabled by default until starting values can be
established for the hardware supported by this driver.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
diff --git a/drivers/scsi/cxlflash/common.h b/drivers/scsi/cxlflash/common.h
index 9d56b8c..3ff05f1 100644
--- a/drivers/scsi/cxlflash/common.h
+++ b/drivers/scsi/cxlflash/common.h
@@ -15,6 +15,7 @@
#ifndef _CXLFLASH_COMMON_H
#define _CXLFLASH_COMMON_H
+#include <linux/irq_poll.h>
#include <linux/list.h>
#include <linux/rwsem.h>
#include <linux/types.h>
@@ -196,10 +197,17 @@
char version[16];
u64 interface_version;
+ u32 irqpoll_weight;
+ struct irq_poll irqpoll;
struct cxlflash_cfg *parent; /* Pointer back to parent cxlflash_cfg */
};
+static inline bool afu_is_irqpoll_enabled(struct afu *afu)
+{
+ return !!afu->irqpoll_weight;
+}
+
static inline bool afu_is_cmd_mode(struct afu *afu, u64 cmd_mode)
{
u64 afu_cap = afu->interface_version >> SISL_INTVER_CAP_SHIFT;