From c72f9f7bd23c91e944910d9bcbf12503d21a4a1f Mon Sep 17 00:00:00 2001 From: Bean Huo Date: Fri, 4 Sep 2026 12:51:55 +0200 Subject: [PATCH] nvme-pci: add NVME_QUIRK_DMAPOOL_ALIGN_512 for Micron 4100AT 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 da9619a30e73 ("dmapool: link blocks across pages"), so this affects v6.4 and later. Align the small descriptor pool to 512 bytes, as commit ebefac564796 ("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: # 6.4.x: ebefac564796: nvme-pci: 512 byte aligned dma pool segment quirk Cc: # 6.4.x Signed-off-by: Gaurav Sinha Signed-off-by: Bean Huo Signed-off-by: Keith Busch --- drivers/nvme/host/pci.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index da93b505d239..39ef2a18d05c 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -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 */