linux-kernel - [RFC PATCH v2 0/1] scsi: mpi3mr: Introduce smp_affinity

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Message-ID: <20250601014056.128716-1-atomlin@atomlin.com>
Date: Sat, 31 May 2025 21:40:55 -0400
From: Aaron Tomlin <atomlin@...mlin.com>
To: mpi3mr-linuxdrv.pdl@...adcom.com
Cc: kashyap.desai@...adcom.com,
	sumit.saxena@...adcom.com,
	sreekanth.reddy@...adcom.com,
	James.Bottomley@...senPartnership.com,
	martin.petersen@...cle.com,
	atomlin@...mlin.com,
	linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH v2 0/1] scsi: mpi3mr: Introduce smp_affinity_enable module parameter

I noticed that the Linux MegaRAID driver for SAS based RAID controllers has
the same aforementioned module parameter. Despite the potential performance
drawbacks, I suspect it would be useful with the Broadcom MPI3 Storage
Controller Driver too, to respect the default IRQ affinity.
Please let me know your thoughts.

Changes since v1 [1]
 - Addressed WARN_ON() in pci_alloc_irq_vectors_affinity()
   due to affd != NULL when smp_affinity_enable = 0
 - Avoid unnecessary complexity for a single queue

[1]: https://lore.kernel.org/lkml/20250428094141.1385188-2-atomlin@atomlin.com/

Aaron Tomlin (1):
  scsi: mpi3mr: Introduce smp_affinity_enable module parameter

 drivers/scsi/mpi3mr/mpi3mr.h    |  1 +
 drivers/scsi/mpi3mr/mpi3mr_fw.c | 14 ++++++++++++--
 drivers/scsi/mpi3mr/mpi3mr_os.c | 14 +++++++++++---
 3 files changed, 24 insertions(+), 5 deletions(-)

-- 
2.49.0