linux-kernel - [PATCH v2 0/2] ufs: pci: Add support UFSHCI 4.0 MCQ

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Date: Sat,  1 Jun 2024 06:22:42 +0900
From: Minwoo Im <minwoo.im@...sung.com>
To: "James E . J . Bottomley" <James.Bottomley@...senPartnership.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>, Bart Van Assche
	<bvanassche@....org>
Cc: Alim Akhtar <alim.akhtar@...sung.com>, Avri Altman
	<avri.altman@....com>, Minwoo Im <minwoo.im@...sung.com>,
	gost.dev@...sung.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, Jeuk Kim <jeuk20.kim@...sung.com>
Subject: [PATCH v2 0/2] ufs: pci: Add support UFSHCI 4.0 MCQ

This patchset introduces add support for MCQ introduced in UFSHCI 4.0.  The
first patch adds a simple helper to get the address of MCQ queue config
registers.  The second one enables MCQ feature by adding mandatory vops
callback functions required at MCQ initialization phase.  The last one is to
prevent a case where number of MCQ is given 1 since driver allocates poll_queues
first rather than I/O queues to handle device commands.  Instead of causing
exception handlers due to no I/O queue, failfast during the initialization time.

---
v2:
  - https://lore.kernel.org/linux-scsi/20240531103821.1583934-1-minwoo.im@samsung.com/T/#t
  - Not separate the newly introduced function from the actuall caller in the
    other patch by squash the second patch to the first one (Bart).
  - Rename ufs_redhat_* in ufshcd-pci.c to ufs_qemu_* to represent that it's
    for QEMU UFS PCI device (Bart).

Minwoo Im (2):
  ufs: pci: Add support MCQ for QEMU-based UFS
  ufs: mcq: Prevent no I/O queue case for MCQ

 drivers/ufs/core/ufs-mcq.c    | 23 +++++++++++++++++
 drivers/ufs/host/ufshcd-pci.c | 48 ++++++++++++++++++++++++++++++++++-
 include/ufs/ufshcd.h          |  1 +
 3 files changed, 71 insertions(+), 1 deletion(-)

-- 
2.34.1