| Message ID | 1410184472-17630-7-git-send-email-Liviu.Dudau@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, Sep 08, 2014 at 02:54:28PM +0100, Liviu Dudau wrote: > The handling of PCI domains (or PCI segments in ACPI speak) is > usually a straightforward affair but its implementation is > currently left to the architectural code, with pci_domain_nr(b) > querying the value of the domain associated with bus b. > > This patch introduces CONFIG_PCI_DOMAINS_GENERIC as an > option that can be selected if an architecture want a > simple implementation where the value of the domain > associated with a bus is stored in struct pci_bus. > > The architectures that select CONFIG_PCI_DOMAINS_GENERIC will > then have to implement pci_bus_assign_domain_nr() as a way > of setting the domain number associated with a root bus. > All child busses except the root bus will inherit the domain_nr > value from their parent. > > Cc: Bjorn Helgaas <bhelgaas@google.com> > Cc: Arnd Bergmann <arnd@arndb.de> > Signed-off-by: Catalin Marinas <Catalin.Marinas@arm.com> > [Renamed pci_set_domain_nr() to pci_bus_assign_domain_nr()] > Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com> I'm probably the author here, but the patch log doesn't say so (I don't mind, just a remark).
On Mon, Sep 08, 2014 at 03:03:21PM +0100, Catalin Marinas wrote: > On Mon, Sep 08, 2014 at 02:54:28PM +0100, Liviu Dudau wrote: > > The handling of PCI domains (or PCI segments in ACPI speak) is > > usually a straightforward affair but its implementation is > > currently left to the architectural code, with pci_domain_nr(b) > > querying the value of the domain associated with bus b. > > > > This patch introduces CONFIG_PCI_DOMAINS_GENERIC as an > > option that can be selected if an architecture want a > > simple implementation where the value of the domain > > associated with a bus is stored in struct pci_bus. > > > > The architectures that select CONFIG_PCI_DOMAINS_GENERIC will > > then have to implement pci_bus_assign_domain_nr() as a way > > of setting the domain number associated with a root bus. > > All child busses except the root bus will inherit the domain_nr > > value from their parent. > > > > Cc: Bjorn Helgaas <bhelgaas@google.com> > > Cc: Arnd Bergmann <arnd@arndb.de> > > Signed-off-by: Catalin Marinas <Catalin.Marinas@arm.com> > > [Renamed pci_set_domain_nr() to pci_bus_assign_domain_nr()] > > Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com> > > I'm probably the author here, but the patch log doesn't say so (I don't > mind, just a remark). I've took you patch initially from an email fragment, sorry, should've altered the commiter accordingly. Best regards, Liviu > > -- > Catalin
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 5ff72ec..ef891d2 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -485,7 +485,7 @@ void pci_read_bridge_bases(struct pci_bus *child) } } -static struct pci_bus *pci_alloc_bus(void) +static struct pci_bus *pci_alloc_bus(struct pci_bus *parent) { struct pci_bus *b; @@ -500,6 +500,10 @@ static struct pci_bus *pci_alloc_bus(void) INIT_LIST_HEAD(&b->resources); b->max_bus_speed = PCI_SPEED_UNKNOWN; b->cur_bus_speed = PCI_SPEED_UNKNOWN; +#ifdef CONFIG_PCI_DOMAINS_GENERIC + if (parent) + b->domain_nr = parent->domain_nr; +#endif return b; } @@ -672,7 +676,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, /* * Allocate a new bus, and inherit stuff from the parent.. */ - child = pci_alloc_bus(); + child = pci_alloc_bus(parent); if (!child) return NULL; @@ -1768,13 +1772,14 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus, bridge->dev.parent = parent; - b = pci_alloc_bus(); + b = pci_alloc_bus(NULL); if (!b) goto err_out; b->sysdata = sysdata; b->ops = ops; b->number = b->busn_res.start = bus; + pci_bus_assign_domain_nr(b, parent); b2 = pci_find_bus(pci_domain_nr(b), bus); if (b2) { /* If we already got to this bus through a different bridge, ignore it */ diff --git a/include/linux/pci.h b/include/linux/pci.h index 61978a4..a494e5d 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -456,6 +456,9 @@ struct pci_bus { unsigned char primary; /* number of primary bridge */ unsigned char max_bus_speed; /* enum pci_bus_speed */ unsigned char cur_bus_speed; /* enum pci_bus_speed */ +#ifdef CONFIG_PCI_DOMAINS_GENERIC + int domain_nr; +#endif char name[48]; @@ -1288,6 +1291,24 @@ static inline int pci_domain_nr(struct pci_bus *bus) { return 0; } static inline int pci_proc_domain(struct pci_bus *bus) { return 0; } #endif /* CONFIG_PCI_DOMAINS */ +/* + * Generic implementation for PCI domain support. If your + * architecture does not need custom management of PCI + * domains then this implementation will be used + */ +#ifdef CONFIG_PCI_DOMAINS_GENERIC +static inline int pci_domain_nr(struct pci_bus *bus) +{ + return bus->domain_nr; +} +void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent); +#else +static inline void pci_bus_assign_domain_nr(struct pci_bus *bus, + struct device *parent) +{ +} +#endif + /* some architectures require additional setup to direct VGA traffic */ typedef int (*arch_set_vga_state_t)(struct pci_dev *pdev, bool decode, unsigned int command_bits, u32 flags);