github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-11-07 06:17:02 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

nvme-pci: add NVME_QUIRK_DMAPOOL_ALIGN_512 for Micron 4100AT

Browse Source 
The Micron 4100AT fetches PRP Lists in 512 byte strides, but the driver
allocates small PRP List descriptors in 256 byte strides.  A descriptor
in the last 256 bytes of a dmapool page makes the controller read past
the page: the access lands on an adjacent IOVA, the IOMMU faults the
command. That last block only became reachable with commit da9619a30e
("dmapool: link blocks across pages"), so this affects v6.4 and later.

Align the small descriptor pool to 512 bytes, as commit ebefac5647
("nvme-pci: 512 byte aligned dma pool segment quirk") already does for
another controller with the same erratum.  The last block then starts
at offset 0xE00 and the fetch stays inside the page.

Cc: <stable@vger.kernel.org> # 6.4.x: ebefac564796: nvme-pci: 512 byte aligned dma pool segment quirk
Cc: <stable@vger.kernel.org> # 6.4.x
Signed-off-by: Gaurav Sinha <gsinha@micron.com>
Signed-off-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Bean Huo 2026-09-04 12:51:55 +02:00 committed by Keith Busch
parent 5067d4ba71
commit c72f9f7bd2
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/nvme/host/pci.c
View File

@ -4196,6 +4196,8 @@ static const struct pci_device_id nvme_id_table[] = {
.driver_data = NVME_QUIRK_IGNORE_DEV_SUBNQN },
{ PCI_DEVICE(0x1344, 0x6001), /* Micron Nitro NVMe */
.driver_data = NVME_QUIRK_BOGUS_NID, },
{ PCI_DEVICE(0x1344, 0x6004), /* Micron 4100AT */
.driver_data = NVME_QUIRK_DMAPOOL_ALIGN_512, },
{ PCI_DEVICE(0x1c5c, 0x1504), /* SK Hynix PC400 */
.driver_data = NVME_QUIRK_DISABLE_WRITE_ZEROES, },
{ PCI_DEVICE(0x1c5c, 0x174a), /* SK Hynix P31 SSD */