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| author | Liviu Dudau <Liviu.Dudau@arm.com> | 2014-09-29 18:29:27 +0400 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2014-10-01 03:08:57 +0400 |
| commit | 41e5c0f81d3e676d671d96a0a1fafb27abfbd9d7 (patch) | |
| tree | 674d5c5bc98998014d5b454f059bb052660057d5 /drivers/pci | |
| parent | 670ba0c8883b576d0aec28bd7a838358a4be1406 (diff) | |
| download | linux-41e5c0f81d3e676d671d96a0a1fafb27abfbd9d7.tar.xz | |
of/pci: Add pci_get_new_domain_nr() and of_get_pci_domain_nr()
Add pci_get_new_domain_nr() to allocate a new domain number and
of_get_pci_domain_nr() to retrieve the PCI domain number of a given device
from DT. Host bridge drivers or architecture-specific code can choose to
implement their PCI domain number policy using these two functions.
Using of_get_pci_domain_nr() guarantees a stable PCI domain number on every
boot provided that all host bridge controllers are assigned a number in the
device tree using "linux,pci-domain" property. Mixing use of
pci_get_new_domain_nr() and of_get_pci_domain_nr() is not recommended as it
can lead to potentially conflicting domain numbers being assigned to root
buses behind different host bridges.
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Grant Likely <grant.likely@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 2c9ac70254e2..d36f35ff6c5d 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -4406,6 +4406,15 @@ static void pci_no_domains(void) #endif } +#ifdef CONFIG_PCI_DOMAINS +static atomic_t __domain_nr = ATOMIC_INIT(-1); + +int pci_get_new_domain_nr(void) +{ + return atomic_inc_return(&__domain_nr); +} +#endif + /** * pci_ext_cfg_avail - can we access extended PCI config space? * |