Re: [Linaro-acpi] [RFC PATCH 1/3] pci, acpi: Match PCI config space accessors against platfrom specific ECAM quirks.

On 02.06.2016 13:42, Arnd Bergmann wrote:

On Thursday, June 2, 2016 10:41:01 AM CEST Tomasz Nowicki wrote:

...

+struct pci_ecam_ops *pci_mcfg_get_ops(struct acpi_pci_root *root) +{

•   int bus_num = root->secondary.start;
  

•   int domain = root->segment;
  

•   struct pci_cfg_fixup *f;
  

•   if (!mcfg_table)
  

•           return &pci_generic_ecam_ops;
  

•   /*
  

•    * Match against platform specific quirks and return corresponding
  

•    * CAM ops.
  

•    *
  

•    * First match against PCI topology <domain:bus> then use OEM ID and
  

•    * OEM revision from MCFG table standard header.
  

•    */
  

•   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) &&
  

•               (!strncmp(f->oem_id, mcfg_table->header.oem_id,
  

•                         ACPI_OEM_ID_SIZE)) &&
  

•               (f->oem_revision == mcfg_table->header.oem_revision))
  

•                   return f->ops;
  

•   }
  

•   /* No quirks, use ECAM */
  

•   return &pci_generic_ecam_ops;
  

+}

• int pci_mcfg_lookup(struct acpi_pci_root *root)

Can you explain the use of pci_ecam_ops instead of pci_ops here?

I wanted to get associated bus_shift and use it to setup configuration region properly before calling pci_ecam_create. Please see next patch.

Thanks, Tomasz