[PATCH v1 1/7] mpi3mr: Add module parameter to control threaded IRQ polling

[Ranjan Kumar <ranjan.kumar@broadcom.com>]

Add a module parameter to enable or disable threaded IRQ polling
in the driver. The default behavior remains unchanged
with polling enabled.

When disabled, completion processing is kept entirely in the
hard IRQ context, avoiding the threaded polling path.

Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
---
 drivers/scsi/mpi3mr/mpi3mr_fw.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/mpi3mr/mpi3mr_fw.c b/drivers/scsi/mpi3mr/mpi3mr_fw.c
index 8fe6e0bf342e..869e525f3e73 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_fw.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_fw.c
@@ -21,6 +21,10 @@ static int mpi3mr_check_op_admin_proc(struct mpi3mr_ioc *mrioc);
 static int poll_queues;
 module_param(poll_queues, int, 0444);
 MODULE_PARM_DESC(poll_queues, "Number of queues for io_uring poll mode. (Range 1 - 126)");
+static bool threaded_isr_poll = true;
+module_param(threaded_isr_poll, bool, 0444);
+MODULE_PARM_DESC(threaded_isr_poll,
+			"Enablement of IRQ polling thread (default=true)");
 
 #if defined(writeq) && defined(CONFIG_64BIT)
 static inline void mpi3mr_writeq(__u64 b, void __iomem *addr,
@@ -595,7 +599,8 @@ int mpi3mr_process_op_reply_q(struct mpi3mr_ioc *mrioc,
 		 * Exit completion loop to avoid CPU lockup
 		 * Ensure remaining completion happens from threaded ISR.
 		 */
-		if (num_op_reply > mrioc->max_host_ios) {
+		if ((num_op_reply > mrioc->max_host_ios) &&
+			(threaded_isr_poll == true)) {
 			op_reply_q->enable_irq_poll = true;
 			break;
 		}
@@ -692,7 +697,7 @@ static irqreturn_t mpi3mr_isr(int irq, void *privdata)
 	 * If more IOs are expected, schedule IRQ polling thread.
 	 * Otherwise exit from ISR.
 	 */
-	if (!intr_info->op_reply_q)
+	if ((threaded_isr_poll == false) || !intr_info->op_reply_q)
 		return ret;
 
 	if (!intr_info->op_reply_q->enable_irq_poll ||
-- 
2.47.3