Re: [PATCH V2 22/23] pci, acpi: Match PCI config space accessors against platfrom specific quirks.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 21.12.2015 12:47, Gabriele Paoloni wrote:
2) In the quirk mechanism you proposed, I see that the callback function
    allows to do some preparation work for the host bridge. For example in
    Hisilicon hip05 case we would need to read some values from the ACPI
    table (see acpi_pci_root_hisi_add() function in
    https://lkml.org/lkml/2015/12/3/426).
    I am quite new to ACPI and I wonder if it is OK to add such "Packages"
    to the  PCI host bridge ACPI device...or maybe we need to declare a new
    one...?

I may miss sth so please correct me in that case.

https://lkml.org/lkml/2015/12/3/426 shows that you need special handling for root->secondary.start bus number only, right? So how about creating special MCFG region <rc-base:rc-base+rc-size> only for <segment,bus>. Like that:

[0008]                       Base Address : <rc-base>
[0002]               Segment Group Number : <segment>
[0001]                   Start Bus Number : <root->secondary.start>
[0001]                     End Bus Number : <root->secondary.start>
[0004]                           Reserved : 00000000


static const struct dmi_system_id hisi_quirk[] = {
	{
		.ident = "HiSi...",
		.matches = {
			DMI_MATCH(<whatever you need to match your platform>),
		},
	},
	{ }
};

static struct pci_ops hisi_ecam_pci_ops = {
	.map_bus = pci_mcfg_dev_base,
	.read = hisi_pcie_cfg_read,
	.write = hisi_pcie_cfg_write,
};

DECLARE_ACPI_MCFG_FIXUP(hisi_quirk, &hisi_ecam_pci_ops,
			<segment>, <bus>);

With above code you can use your custom PCI config accessor only for that region.

Let me know if that is not enough for you.

Tomasz
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux IBM ACPI]     [Linux Power Management]     [Linux Kernel]     [Linux Laptop]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Device Mapper]     [Linux Resources]

  Powered by Linux