Hi Tomasz, Mark
在 2016/1/18 20:41, Tomasz Nowicki 写道:
On 14.01.2016 16:36, Mark Salter wrote:
+extern struct pci_mcfg_fixup __start_acpi_mcfg_fixups[];
>+extern struct pci_mcfg_fixup __end_acpi_mcfg_fixups[];
>+
>+static struct pci_ops *pci_mcfg_check_quirks(struct acpi_pci_root *root)
>+{
>+ struct pci_mcfg_fixup *f;
>+ int bus_num = root->secondary.start;
>+ int domain = root->segment;
>+
>+ /*
>+ * First match against PCI topology <domain:bus> then use DMI or
>+ * custom match handler.
>+ */
>+ for (f = __start_acpi_mcfg_fixups; f < __end_acpi_mcfg_fixups; f++) {
>+ if ((f->domain == domain || f->domain == PCI_MCFG_DOMAIN_ANY) &&
>+ (f->bus_num == bus_num || f->bus_num == PCI_MCFG_BUS_ANY) &&
>+ (f->system ? dmi_check_system(f->system) : 0 ||
>+ f->match ? f->match(f, root) : 0))
>+ return f->ops;
I think this would be better as:
(f->system ? dmi_check_system(f->system) : 1 &&
f->match ? f->match(f, root) : 1))
return f->ops;
Otherwise, one has to call dmi_check_system() from f->match() if
access to root is needed.
Non-DMI, we need not to call dmi_check_system() from f->match(),
we can use _HID to decide to hook the pci_ops or not.
Device (PCI1)
{
Name (_HID, "HISI0080") // PCI Express Root Bridge
Name (_CID, "PNP0A03") // Compatible PCI Root Bridge
...
}
static const struct acpi_device_id hisi_pcie_ids[] = {
{"HISI0080", 0},
{"", 0},
};
static int hisi_pcie_match(struct pci_mcfg_fixup *fixup, struct acpi_pci_root *root)
{
int ret;
struct acpi_device *device;
device = root->device;
ret = acpi_match_device_ids(device, hisi_pcie_ids);
if (ret)
return 0;
......
return 1;
}
static struct pci_ops hisi_ecam_pci_ops = {
.map_bus = pci_mcfg_dev_base,
.read = hisi_pci_read,
.write = hisi_pci_write,
};
DECLARE_ACPI_MCFG_FIXUP(NULL, hisi_pcie_match, &hisi_ecam_pci_ops,
PCI_MCFG_DOMAIN_ANY, PCI_MCFG_BUS_ANY);
Thanks
Dongdong
Makes a lot of sense to me, I will modify as you suggested.
Tomasz
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