Author: imp Date: Fri Oct 26 14:27:37 2018 New Revision: 339775 URL: https://svnweb.freebsd.org/changeset/base/339775
Log: Put a workaround in for command timeout malfunctioning At least one NVMe drive has a bug that makeing the Command Time Out PCIe feature unreliable. The workaround is to disable this feature. The driver wouldn't deal correctly with a timeout anyway. Only do this for drives that are known bad. Sponsored by: Netflix, Inc Differential Revision: https://reviews.freebsd.org/D17708 Modified: head/sys/dev/nvme/nvme.c head/sys/dev/nvme/nvme_private.h Modified: head/sys/dev/nvme/nvme.c ============================================================================== --- head/sys/dev/nvme/nvme.c Fri Oct 26 12:27:07 2018 (r339774) +++ head/sys/dev/nvme/nvme.c Fri Oct 26 14:27:37 2018 (r339775) @@ -106,6 +106,7 @@ static struct _pcsid { 0x05401c5f, 0, 0, "Memblaze Pblaze4", QUIRK_DELAY_B4_CHK_RDY }, { 0xa821144d, 0, 0, "Samsung PM1725", QUIRK_DELAY_B4_CHK_RDY }, { 0xa822144d, 0, 0, "Samsung PM1725a", QUIRK_DELAY_B4_CHK_RDY }, + { 0x01161179, 0, 0, "Toshiba XG5", QUIRK_DISABLE_TIMEOUT }, { 0x00000000, 0, 0, NULL } }; @@ -276,6 +277,25 @@ nvme_attach(device_t dev) if (status != 0) { nvme_ctrlr_destruct(ctrlr, dev); return (status); + } + + /* + * Some drives do not implement the completion timeout feature + * correctly. There's a WAR from the manufacturer to just disable it. + * The driver wouldn't respond correctly to a timeout anyway. + */ + if (ep->quirks & QUIRK_DISABLE_TIMEOUT) { + int ptr; + uint16_t devctl2; + + status = pci_find_cap(dev, PCIY_EXPRESS, &ptr); + if (status) { + device_printf(dev, "Can't locate PCIe capability?"); + return (status); + } + devctl2 = pci_read_config(dev, ptr + PCIER_DEVICE_CTL2, sizeof(devctl2)); + devctl2 |= PCIEM_CTL2_COMP_TIMO_DISABLE; + pci_write_config(dev, ptr + PCIER_DEVICE_CTL2, devctl2, sizeof(devctl2)); } /* Modified: head/sys/dev/nvme/nvme_private.h ============================================================================== --- head/sys/dev/nvme/nvme_private.h Fri Oct 26 12:27:07 2018 (r339774) +++ head/sys/dev/nvme/nvme_private.h Fri Oct 26 14:27:37 2018 (r339775) @@ -247,7 +247,8 @@ struct nvme_controller { uint32_t ready_timeout_in_ms; uint32_t quirks; -#define QUIRK_DELAY_B4_CHK_RDY 1 /* Can't touch MMIO on disable */ +#define QUIRK_DELAY_B4_CHK_RDY 1 /* Can't touch MMIO on disable */ +#define QUIRK_DISABLE_TIMEOUT 2 /* Disable broken completion timeout feature */ bus_space_tag_t bus_tag; bus_space_handle_t bus_handle; _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
