diff options
| author | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-07-15 22:13:00 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2010-02-20 01:12:26 +0100 |
| commit | cf4c43dd439b90a1a876b3f836ebe745abb9a269 (patch) | |
| tree | 59d7a278d9d5cb6c9927819fa75231e284b29556 | |
| parent | Linux 2.6.33-rc8 (diff) | |
| download | linux-cf4c43dd439b90a1a876b3f836ebe745abb9a269.tar.xz linux-cf4c43dd439b90a1a876b3f836ebe745abb9a269.zip | |
PCI: Add pci_bus_find_ext_capability
For use by code that needs to walk extended capability lists before
pci_dev structures are set up.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
LKML-Reference: <43F901BD926A4E43B106BF17856F07559FB80CFD@orsmsx508.amr.corp.intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
| -rw-r--r-- | drivers/pci/pci.c | 43 | ||||
| -rw-r--r-- | include/linux/pci.h | 2 |
2 files changed, 45 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 315fea47e784..aad62af2b4c6 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -297,6 +297,49 @@ int pci_find_ext_capability(struct pci_dev *dev, int cap) } EXPORT_SYMBOL_GPL(pci_find_ext_capability); +/** + * pci_bus_find_ext_capability - find an extended capability + * @bus: the PCI bus to query + * @devfn: PCI device to query + * @cap: capability code + * + * Like pci_find_ext_capability() but works for pci devices that do not have a + * pci_dev structure set up yet. + * + * Returns the address of the requested capability structure within the + * device's PCI configuration space or 0 in case the device does not + * support it. + */ +int pci_bus_find_ext_capability(struct pci_bus *bus, unsigned int devfn, + int cap) +{ + u32 header; + int ttl; + int pos = PCI_CFG_SPACE_SIZE; + + /* minimum 8 bytes per capability */ + ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8; + + if (!pci_bus_read_config_dword(bus, devfn, pos, &header)) + return 0; + if (header == 0xffffffff || header == 0) + return 0; + + while (ttl-- > 0) { + if (PCI_EXT_CAP_ID(header) == cap) + return pos; + + pos = PCI_EXT_CAP_NEXT(header); + if (pos < PCI_CFG_SPACE_SIZE) + break; + + if (!pci_bus_read_config_dword(bus, devfn, pos, &header)) + break; + } + + return 0; +} + static int __pci_find_next_ht_cap(struct pci_dev *dev, int pos, int ht_cap) { int rc, ttl = PCI_FIND_CAP_TTL; diff --git a/include/linux/pci.h b/include/linux/pci.h index c1968f464c38..65f8a8f9d3e5 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -631,6 +631,8 @@ enum pci_lost_interrupt_reason pci_lost_interrupt(struct pci_dev *dev); int pci_find_capability(struct pci_dev *dev, int cap); int pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap); int pci_find_ext_capability(struct pci_dev *dev, int cap); +int pci_bus_find_ext_capability(struct pci_bus *bus, unsigned int devfn, + int cap); int pci_find_ht_capability(struct pci_dev *dev, int ht_cap); int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap); struct pci_bus *pci_find_next_bus(const struct pci_bus *from); |