This series is against "next" branch in Bjorn's repo:
git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git
Changes from v3 to v4:
- pcim_enable_msi* functions renamed to pci_auto_enable_msi* ones
- PowerPC patches dropped
- pci_get_msi_cap() renamed to pci_get_msix_vec_count() and
pci_msix_table_size() renamed to pci_get_msix_vec_count()
Changes from v2 to v3:
- new public interfaces commented in drivers/pci/msi.c;
- patch "Make quota traversing and requesting race-safe" explained;
- pci_enable_msi/msix() 'nvec' arg type changed from 'unsigned int' to 'int';
- pcim_enable_msi*() arg 'nvec' renamed to 'maxvec' when upper limit passed;
- pcim_enable_msi*(..., maxvec, minvec) arg order swapped to minvec, maxvec;
- "PCI: Fail MSI/MSI-X initialization if device is not in PCI_D0" commit
869a161 and "PCI/MSI: Factor out pci_get_msi_cap() interface" patch
conflicts resolved;
Currently many device drivers need contiguously call functions
pci_enable_msix() for MSI-X or pci_enable_msi_block() for MSI
in a loop until success or failure. This update generalizes
this usage pattern and introduces pci_auto_enable_msi*() family
helpers.
As result, device drivers do not have to deal with tri-state
return values from pci_enable_msix() and pci_enable_msi_block()
functions directly and expected to have more clearer and straight
code.
So i.e. the request loop described in the documentation...
int foo_driver_enable_msix(struct foo_adapter *adapter,
int nvec)
{
while (nvec >= FOO_DRIVER_MINIMUM_NVEC) {
rc = pci_enable_msix(adapter->pdev,
adapter->msix_entries,
nvec);
if (rc > 0)
nvec = rc;
else
return rc;
}
return -ENOSPC;
}
...would turn into a single helper call....
rc = pci_auto_enable_msix_range(adapter->pdev,
adapter->msix_entries,
FOO_DRIVER_MINIMUM_NVEC,
nvec);
Device drivers with more specific requirements (i.e. a number of
MSI-Xs which is a multiple of a certain number within a specified
range) would still need to implement the loop using the two old
functions.
The tree could be found in "pci-next-msi-v4" branch in repo:
https://github.com/a-gordeev/linux.git
Alexander Gordeev (9):
PCI/MSI/s390: Fix single MSI only check
PCI/MSI/s390: Remove superfluous check of MSI type
PCI/MSI: Fix return value when populate_msi_sysfs() failed
PCI/MSI: Return -ENOSYS for unimplemented interfaces, not -1
PCI/MSI: Make pci_enable_msi/msix() 'nvec' argument type as int
PCI/MSI: Factor out pci_get_msi_vec_count() interface
PCI/MSI: Get rid of pci_enable_msi_block_auto() interface
PCI/MSI: Introduce pci_get_msix_vec_count() interface
PCI/MSI: Introduce pci_auto_enable_msi*() family helpers
Documentation/PCI/MSI-HOWTO.txt | 175 +++++++++++++++++++++++++++++++++------
arch/s390/pci/pci.c | 4 +-
drivers/ata/ahci.c | 56 ++++++++-----
drivers/pci/msi.c | 163 +++++++++++++++++++++++++++---------
drivers/pci/pcie/portdrv_core.c | 7 +-
include/linux/pci.h | 78 +++++++++++++++---
6 files changed, 380 insertions(+), 103 deletions(-)
--
1.7.7.6
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