{"id":2219689,"url":"http://patchwork.ozlabs.org/api/1.0/patches/2219689/?format=json","project":{"id":13,"url":"http://patchwork.ozlabs.org/api/1.0/projects/13/?format=json","name":"Linux IDE development","link_name":"linux-ide","list_id":"linux-ide.vger.kernel.org","list_email":"linux-ide@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null},"msgid":"<20260403191801.79888-1-artmoty@gmail.com>","date":"2026-04-03T19:17:52","name":"[v2] ata: ahci: force 32-bit DMA for JMicron JMB582/JMB585","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"f645cd7206507ed8c8ffebff4189344183417c69","submitter":{"id":93046,"url":"http://patchwork.ozlabs.org/api/1.0/people/93046/?format=json","name":"Arthur Husband","email":"artmoty@gmail.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-ide/patch/20260403191801.79888-1-artmoty@gmail.com/mbox/","series":[{"id":498666,"url":"http://patchwork.ozlabs.org/api/1.0/series/498666/?format=json","date":"2026-04-03T19:17:52","name":"[v2] ata: ahci: force 32-bit DMA for JMicron JMB582/JMB585","version":2,"mbox":"http://patchwork.ozlabs.org/series/498666/mbox/"}],"check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2219689/checks/","tags":{},"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ide@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=WpR/XBh5;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=104.64.211.4; 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charset=UTF-8","Content-Transfer-Encoding":"8bit"},"content":"The JMicron JMB585 (and JMB582) SATA controllers advertise 64-bit DMA\nsupport via the S64A bit in the AHCI CAP register, but their 64-bit DMA\nimplementation is defective. Under sustained I/O, DMA transfers targeting\naddresses above 4GB silently corrupt data — writes land at incorrect\nmemory addresses with no errors logged.\n\nThe failure pattern is similar to the ASMedia ASM1061 (commit\n2073d0e9b2778 (\"ahci: add 43-bit DMA address quirk for ASMedia ASM1061\ncontrollers\")), which also falsely advertised full 64-bit DMA support.\nHowever, the JMB585 requires a stricter 32-bit DMA mask rather than\n43-bit, as corruption occurs with any address above 4GB.\n\nOn the Minisforum N5 Pro specifically, the combination of the JMB585's\nbroken 64-bit DMA with the AMD Family 1Ah (Strix Point) IOMMU causes\nsilent data corruption that is only detectable via checksumming\nfilesystems (BTRFS/ZFS scrub). The corruption occurs when 32-bit IOVA\nspace is exhausted and the kernel transparently switches to 64-bit DMA\naddresses.\n\nAdd device-specific PCI ID entries for the JMB582 (0x0582) and JMB585\n(0x0585) before the generic JMicron class match, using a new board type\nthat combines AHCI_HFLAG_IGN_IRQ_IF_ERR (preserving existing behavior)\nwith AHCI_HFLAG_32BIT_ONLY to force 32-bit DMA masks.\n\nSigned-off-by: Arthur Husband \n---\n drivers/ata/ahci.c | 16 +++++++++++++++-\n 1 file changed, 15 insertions(+), 1 deletion(-)\n\n \tboard_ahci_mcp89,\n@@ -115,6 +116,14 @@ static const struct ata_port_info ahci_port_info[] = {\n \t\t.udma_mask\t= ATA_UDMA6,\n \t\t.port_ops\t= &ahci_ops,\n \t},\n+\t/* JMicron JMB582/585: 64-bit DMA is broken, force 32-bit */\n+\t[board_ahci_jmb585] = {\n+\t\tAHCI_HFLAGS\t(AHCI_HFLAG_IGN_IRQ_IF_ERR |\n+\t\t\t\t AHCI_HFLAG_32BIT_ONLY),\n+\t\t.flags\t\t= AHCI_FLAG_COMMON,\n+\t\t.pio_mask\t= ATA_PIO4,\n+\t\t.udma_mask\t= ATA_UDMA6,\n+\t\t.port_ops\t= &ahci_ops,\n+\t},\n \t[board_ahci_no_debounce_delay] = {\n \t\t.flags\t\t= AHCI_FLAG_COMMON,\n \t\t.link_flags\t= ATA_LFLAG_NO_DEBOUNCE_DELAY,\n@@ -XXX,7 +XXX,12 @@ static const struct pci_device_id ahci_pci_tbl[] = {\n \t...\n\n-\t/* JMicron 360/1/3/5/6, match class to avoid IDE function */\n+\t/* JMicron JMB582/585: force 32-bit DMA (broken 64-bit implementation) */\n+\t{ PCI_VDEVICE(JMICRON, 0x0582), board_ahci_jmb585 },\n+\t{ PCI_VDEVICE(JMICRON, 0x0585), board_ahci_jmb585 },\n+\n+\t/* JMicron 360/1/3/5/6, match class to avoid IDE function */\n \t{ PCI_VENDOR_ID_JMICRON, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,\n \t PCI_CLASS_STORAGE_SATA_AHCI, 0xffffff, board_ahci_ign_iferr },\n\n--","diff":"diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c\nindex XXXXXXX..XXXXXXX 100644\n--- a/drivers/ata/ahci.c\n+++ b/drivers/ata/ahci.c\n@@ -51,6 +51,7 @@ enum board_ids {\n\n \t/* board IDs for specific chipsets in alphabetical order */\n \tboard_ahci_al,\n \tboard_ahci_avn,\n+\tboard_ahci_jmb585,\n \tboard_ahci_mcp65,\n \tboard_ahci_mcp77,\n","prefixes":["v2"]}