[PATCH v3 0/5] Retrieve MSI/MSIX cap struct for once on setup

[Gavin Shan <shangw@linux.vnet.ibm.com>]

While we setup MSI or MSI-X for specific PCI device, the address of
MSI or MSI-X capability structure is figured out from the config
space for multiple times. That's unnecessary and the patchset addresses
that. With the patchset applied, the latency for MSI or MSI-X setup
would be decreased hopefully.

v2 -> v3:
	* Remove checking on MSI/MSI-X capability offset in msi_set_enable()
	  and msix_set_enable(). Let the caller does the check
	* Using "u8" for MSI/MSI-X/PM capability
	* Let caller of pci_msi_check_device() checks MSI/MSI-X capability
	* Replace msi_control_reg() with "pos + PCI_MSI_FLAGS"
	* Merge [4/5] to [3/5]
v1 -> v2:
	* Cache the MSI/MSI-X capability offset to pci_dev directly according
	  to Bjorn's suggestion.
	* Rebase to 3.9.RC5

---

drivers/pci/msi.c   |  110 +++++++++++++++++++++++----------------------------
drivers/pci/msi.h   |    1 -
include/linux/pci.h |    4 +-
3 files changed, 52 insertions(+), 63 deletions(-)

Thanks,
Gavin