On Sun, Sep 03, 2017 at 06:42:35PM -0700, John Loy wrote: > I have a system that stopped booting Linux between kernel versions 4.4.9 and > 4.5.3. It has a SATA + NVMe accelerated volume that I use with Windows and > a separate SATA drive with my Linux installation. I'm not expecting the > remapped NVMe thing to be accessible, just the Linux disk, but none of the > drives are accessible. > > Bisecting the changes turned up d684a90 as the first failing change. Passing > pci=nomsi also allows the system to boot newer kernels. Just to be sure, I > built a recent kernel (4.12.9) with the PCI_IRQ_MSIX flag removed from the > per-port call to pci_alloc_irq_vectors in ahci_init_msi. This also allowed > the system to boot normally. > > I'm totally out of my depth though so I'd really appreciate it if anyone has > some ideas on how to proceed with a proper fix. Something like the patch below should work. Maybe Intel can provide an explanation on why their chipset is so fucked up that we can add as a comment. diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c index 5a5fd0b404eb..b8c8ecc854c4 100644 --- a/drivers/ata/ahci.c +++ b/drivers/ata/ahci.c @@ -1470,6 +1470,7 @@ static void ahci_remap_check(struct pci_dev *pdev, int bar, dev_warn(&pdev->dev, "Found %d remapped NVMe devices.\n", count); dev_warn(&pdev->dev, "Switch your BIOS from RAID to AHCI mode to use them.\n"); + hpriv->flags |= AHCI_HFLAG_NO_MSI; } static int ahci_get_irq_vector(struct ata_host *host, int port) -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
