[ATA] and re(4) stability issues
Andrey V. Elsukov
bu7cher at yandex.ru
Wed Dec 10 01:09:56 PST 2008
Victor Balada Diaz wrote:
> Digging at linux source code i've found that they do some special things
> for this chipset that i've been unable to find on our code. This is
> linux code for my chipset:
> 371 AHCI_HFLAGS (AHCI_HFLAG_IGN_SERR_INTERNAL |
> 372 AHCI_HFLAG_32BIT_ONLY | AHCI_HFLAG_NO_MSI |
> 373 AHCI_HFLAG_SECT255),
> File and the rest of the code in here.
> As i saw AHCI_HFLAG_NO_MSI i tried doing the easiest thing i could
> think of, switching MSI and MSI-x off for the whole system, so
> i added to /boot/loader.conf this tunables:
FreeBSD's ata(4) driver doesn't support MSI. This flag in linux's libata used in
if ((hpriv->flags & AHCI_HFLAG_NO_MSI) || pci_enable_msi(pdev))
In FreeBSD's code we have the same:
/* enable PCI interrupt */
pci_read_config(dev, PCIR_COMMAND, 2) & ~0x0400, 2);
AHCI_HFLAG_IGN_SERR_INTERNAL flag targeted to ignore SERR_INTERNAL errors.
FreeBSD's ata(4) driver ignores they too.
AHCI_HFLAG_32BIT_ONLY flag limits to use 32-bit DMA only.
If AHCI CAP register reports that controller supports 64-bit DMA driver will use 64-bit.
So i think there can be added one quirk for you, but i'm not sure that problem is here..
AHCI_HFLAG_SECT255 flag limits I/O operation to 255 sectors, FreeBSD uses 128-limit
WBR, Andrey V. Elsukov
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