[Bug 259541] [smartpqi] panic: Segment size is not aligned, in a call to bus_dmamap_load_ccb() from smartpqi_cam_action.

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 19 Oct 2023 21:24:11 UTC

--- Comment #5 from commit-hook@FreeBSD.org ---
A commit in branch stable/14 references this bug:


commit 01619a8fafcfd99d1811b2c14a92bac1a48c6d31
Author:     John Hall <john.hall@microchip.com>
AuthorDate: 2023-10-19 03:25:32 +0000
Commit:     Warner Losh <imp@FreeBSD.org>
CommitDate: 2023-10-19 21:21:11 +0000

    smartpqi: Change alignment for dma tags

    Problem: Under certain I/O conditions, a program doing large block disk
    reads can cause a controller to crash.

    Root Cause: The SCSI read request and destination address in the BDMA
    descriptor is incorrect, causing the BDMA engine in the controller to

    Fix: Change the alignment for creating bus_dma_tags in the driver from
    PAGE_SIZE (4k) to 1, which allows the controller to manage it's own
    address range for BDMA transactions.

    Risk: Medium

    Exposure: This reverts a change first made to support NVMe drives on
    Excalibur. At that time a 4k alignment was necessary. This no longer
    seems to be the case.

    PR: 259541
    Reported by: Ka Ho Ng <khng@freebsd.org>
    Reviewed by: imp
    Differential Revision:  https://reviews.freebsd.org/D41619

    (cherry picked from commit f07b267d8cc87e88be3c78aa69504b5ebc6571ee)

 sys/dev/smartpqi/smartpqi_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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