linux-kernel - [PATCH v2 0/6] AHCI: Conserve interrupts with pci_enable_msi_block

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Message-ID: <cover.1378383792.git.agordeev@redhat.com>
Date:	Thu, 5 Sep 2013 14:51:39 +0200
From:	Alexander Gordeev <agordeev@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	x86@...nel.org, linux-pci@...r.kernel.org,
	linux-ide@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Ingo Molnar <mingo@...nel.org>, Joerg Roedel <joro@...tes.org>,
	Jan Beulich <JBeulich@...e.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH v2 0/6] AHCI: Conserve interrupts with
 pci_enable_msi_block_part() interface

This series is aimed to conserve on othewise wasted interrupt
resources for 10 of 16 unused MSI vectors for AHCI devices on
Intel chipsets.

Changes from v1:
	- roundup_pow_of_two() and is_power_of_2() functions used
	- patch 2/6 generic pci_get_msi_cap() interface introduced
	- patch 4/6 MMC reg. value used to initialize multiple MSIs;
		    Fallback to single MSI mode is simplified
	- patch 5/6 sanity check for MRSM bit added

Alexander Gordeev (6):
  1/6 PCI/MSI: Introduce pci_enable_msi_block_part() interface
  2/6 PCI/MSI: Factor out pci_get_msi_cap() interface
  3/6 MSI/x86: Support pci_enable_msi_block_part() interface
  4/6 AHCI: Conserve interrupts with pci_enable_msi_block_part() interface
  5/6 AHCI: Check MRSM bit when multiple MSIs enabled
  6/6 PCI/MSI: Get rid of pci_enable_msi_block_auto() interface

 Documentation/PCI/MSI-HOWTO.txt |   68 ++++++++++++++++-------
 arch/mips/pci/msi-octeon.c      |    2 +-
 arch/powerpc/kernel/msi.c       |    4 +-
 arch/s390/pci/pci.c             |    2 +-
 arch/x86/include/asm/pci.h      |    8 ++-
 arch/x86/include/asm/x86_init.h |    3 +-
 arch/x86/kernel/apic/io_apic.c  |    3 +-
 drivers/ata/ahci.c              |   60 ++++++++++++++------
 drivers/ata/ahci.h              |    1 +
 drivers/iommu/irq_remapping.c   |   14 +++---
 drivers/pci/msi.c               |  115 ++++++++++++++++++++++-----------------
 include/linux/msi.h             |    5 +-
 include/linux/pci.h             |   13 ++++-
 13 files changed, 188 insertions(+), 110 deletions(-)

-- 
1.7.7.6


-- 
Regards,
Alexander Gordeev
agordeev@...hat.com
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