1. 28 1月, 2013 3 次提交
  2. 25 1月, 2013 3 次提交
    • A
      AHCI: Support multiple MSIs · 5ca72c4f
      Alexander Gordeev 提交于
      Take advantage of multiple MSIs implementation on x86 - on
      systems with IRQ remapping AHCI ports not only get assigned
      separate MSI vectors - but also separate IRQs. As result,
      interrupts generated by different ports could be serviced on
      different CPUs rather than on a single one.
      
      In cases when number of allocated MSIs is less than requested
      the Sharing Last MSI mode does not get used, no matter
      implemented in hardware or not. Instead, the driver assumes the
      advantage of multiple MSIs is negated and falls back to the
      single MSI mode as if MRSM bit was set (some Intel chips
      implement this strategy anyway - MRSM bit gets set even if the
      number of allocated MSIs exceeds the number of implemented ports).
      Signed-off-by: NAlexander Gordeev <agordeev@redhat.com>
      Acked-by: NJeff Garzik <jgarzik@redhat.com>
      Cc: Bjorn Helgaas <bhelgaas@google.com>
      Cc: Suresh Siddha <suresh.b.siddha@intel.com>
      Cc: Yinghai Lu <yinghai@kernel.org>
      Cc: Matthew Wilcox <willy@linux.intel.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/15bf7ee314dd55f21ec7d2a01c47613cd8190a7c.1353324359.git.agordeev@redhat.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
      5ca72c4f
    • A
      PCI/MSI: Enable multiple MSIs with pci_enable_msi_block_auto() · 08261d87
      Alexander Gordeev 提交于
      The new function pci_enable_msi_block_auto() tries to allocate
      maximum possible number of MSIs up to the number the device
      supports. It generalizes a pattern when pci_enable_msi_block()
      is contiguously called until it succeeds or fails.
      
      Opposite to pci_enable_msi_block() which takes the number of
      MSIs to allocate as a input parameter,
      pci_enable_msi_block_auto() could be used by device drivers to
      obtain the number of assigned MSIs and the number of MSIs the
      device supports.
      Signed-off-by: NAlexander Gordeev <agordeev@redhat.com>
      Acked-by: NBjorn Helgaas <bhelgaas@google.com>
      Cc: Suresh Siddha <suresh.b.siddha@intel.com>
      Cc: Yinghai Lu <yinghai@kernel.org>
      Cc: Matthew Wilcox <willy@linux.intel.com>
      Cc: Jeff Garzik <jgarzik@pobox.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/c3de2419df94a0f95ca1a6f755afc421486455e6.1353324359.git.agordeev@redhat.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
      08261d87
    • A
      x86/MSI: Support multiple MSIs in presense of IRQ remapping · 51906e77
      Alexander Gordeev 提交于
      The MSI specification has several constraints in comparison with
      MSI-X, most notable of them is the inability to configure MSIs
      independently. As a result, it is impossible to dispatch
      interrupts from different queues to different CPUs. This is
      largely devalues the support of multiple MSIs in SMP systems.
      
      Also, a necessity to allocate a contiguous block of vector
      numbers for devices capable of multiple MSIs might cause a
      considerable pressure on x86 interrupt vector allocator and
      could lead to fragmentation of the interrupt vectors space.
      
      This patch overcomes both drawbacks in presense of IRQ remapping
      and lets devices take advantage of multiple queues and per-IRQ
      affinity assignments.
      Signed-off-by: NAlexander Gordeev <agordeev@redhat.com>
      Cc: Bjorn Helgaas <bhelgaas@google.com>
      Cc: Suresh Siddha <suresh.b.siddha@intel.com>
      Cc: Yinghai Lu <yinghai@kernel.org>
      Cc: Matthew Wilcox <willy@linux.intel.com>
      Cc: Jeff Garzik <jgarzik@pobox.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/c8bd86ff56b5fc118257436768aaa04489ac0a4c.1353324359.git.agordeev@redhat.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
      51906e77
  3. 24 1月, 2013 12 次提交
  4. 23 1月, 2013 22 次提交