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925 Commits

Author SHA1 Message Date
Linus Torvalds 4dedde7c7a ACPI and power management updates for 3.15-rc1
- Device PM QoS support for latency tolerance constraints on systems with
    hardware interfaces allowing such constraints to be specified.  That is
    necessary to prevent hardware-driven power management from becoming
    overly aggressive on some systems and to prevent power management
    features leading to excessive latencies from being used in some cases.
 
  - Consolidation of the handling of ACPI hotplug notifications for device
    objects.  This causes all device hotplug notifications to go through
    the root notify handler (that was executed for all of them anyway
    before) that propagates them to individual subsystems, if necessary,
    by executing callbacks provided by those subsystems (those callbacks
    are associated with struct acpi_device objects during device
    enumeration).  As a result, the code in question becomes both smaller
    in size and more straightforward and all of those changes should not
    affect users.
 
  - ACPICA update, including fixes related to the handling of _PRT in cases
    when it is broken and the addition of "Windows 2013" to the list of
    supported "features" for _OSI (which is necessary to support systems
    that work incorrectly or don't even boot without it).  Changes from
    Bob Moore and Lv Zheng.
 
  - Consolidation of ACPI _OST handling from Jiang Liu.
 
  - ACPI battery and AC fixes allowing unusual system configurations to
    be handled by that code from Alexander Mezin.
 
  - New device IDs for the ACPI LPSS driver from Chiau Ee Chew.
 
  - ACPI fan and thermal optimizations related to system suspend and resume
    from Aaron Lu.
 
  - Cleanups related to ACPI video from Jean Delvare.
 
  - Assorted ACPI fixes and cleanups from Al Stone, Hanjun Guo, Lan Tianyu,
    Paul Bolle, Tomasz Nowicki.
 
  - Intel RAPL (Running Average Power Limits) driver cleanups from Jacob Pan.
 
  - intel_pstate fixes and cleanups from Dirk Brandewie.
 
  - cpufreq fixes related to system suspend/resume handling from Viresh Kumar.
 
  - cpufreq core fixes and cleanups from Viresh Kumar, Stratos Karafotis,
    Saravana Kannan, Rashika Kheria, Joe Perches.
 
  - cpufreq drivers updates from Viresh Kumar, Zhuoyu Zhang, Rob Herring.
 
  - cpuidle fixes related to the menu governor from Tuukka Tikkanen.
 
  - cpuidle fix related to coupled CPUs handling from Paul Burton.
 
  - Asynchronous execution of all device suspend and resume callbacks,
    except for ->prepare and ->complete, during system suspend and resume
    from Chuansheng Liu.
 
  - Delayed resuming of runtime-suspended devices during system suspend for
    the PCI bus type and ACPI PM domain.
 
  - New set of PM helper routines to allow device runtime PM callbacks to
    be used during system suspend and resume more easily from Ulf Hansson.
 
  - Assorted fixes and cleanups in the PM core from Geert Uytterhoeven,
    Prabhakar Lad, Philipp Zabel, Rashika Kheria, Sebastian Capella.
 
  - devfreq fix from Saravana Kannan.
 
 /
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Merge tag 'pm+acpi-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI and power management updates from Rafael Wysocki:
 "The majority of this material spent some time in linux-next, some of
  it even several weeks.  There are a few relatively fresh commits in
  it, but they are mostly fixes and simple cleanups.

  ACPI took the lead this time, both in terms of the number of commits
  and the number of modified lines of code, cpufreq follows and there
  are a few changes in the PM core and in cpuidle too.

  A new feature that already got some LWN.net's attention is the device
  PM QoS extension allowing latency tolerance requirements to be
  propagated from leaf devices to their ancestors with hardware
  interfaces for specifying latency tolerance.  That should help systems
  with hardware-driven power management to avoid going too far with it
  in cases when there are latency tolerance constraints.

  There also are some significant changes in the ACPI core related to
  the way in which hotplug notifications are handled.  They affect PCI
  hotplug (ACPIPHP) and the ACPI dock station code too.  The bottom line
  is that all those notification now go through the root notify handler
  and are propagated to the interested subsystems by means of callbacks
  instead of having to install a notify handler for each device object
  that we can potentially get hotplug notifications for.

  In addition to that ACPICA will now advertise "Windows 2013"
  compatibility for _OSI, because some systems out there don't work
  correctly if that is not done (some of them don't even boot).

  On the system suspend side of things, all of the device suspend and
  resume callbacks, except for ->prepare() and ->complete(), are now
  going to be executed asynchronously as that turns out to speed up
  system suspend and resume on some platforms quite significantly and we
  have a few more optimizations in that area.

  Apart from that, there are some new device IDs and fixes and cleanups
  all over.  In particular, the system suspend and resume handling by
  cpufreq should be improved and the cpuidle menu governor should be a
  bit more robust now.

  Specifics:

   - Device PM QoS support for latency tolerance constraints on systems
     with hardware interfaces allowing such constraints to be specified.
     That is necessary to prevent hardware-driven power management from
     becoming overly aggressive on some systems and to prevent power
     management features leading to excessive latencies from being used
     in some cases.

   - Consolidation of the handling of ACPI hotplug notifications for
     device objects.  This causes all device hotplug notifications to go
     through the root notify handler (that was executed for all of them
     anyway before) that propagates them to individual subsystems, if
     necessary, by executing callbacks provided by those subsystems
     (those callbacks are associated with struct acpi_device objects
     during device enumeration).  As a result, the code in question
     becomes both smaller in size and more straightforward and all of
     those changes should not affect users.

   - ACPICA update, including fixes related to the handling of _PRT in
     cases when it is broken and the addition of "Windows 2013" to the
     list of supported "features" for _OSI (which is necessary to
     support systems that work incorrectly or don't even boot without
     it).  Changes from Bob Moore and Lv Zheng.

   - Consolidation of ACPI _OST handling from Jiang Liu.

   - ACPI battery and AC fixes allowing unusual system configurations to
     be handled by that code from Alexander Mezin.

   - New device IDs for the ACPI LPSS driver from Chiau Ee Chew.

   - ACPI fan and thermal optimizations related to system suspend and
     resume from Aaron Lu.

   - Cleanups related to ACPI video from Jean Delvare.

   - Assorted ACPI fixes and cleanups from Al Stone, Hanjun Guo, Lan
     Tianyu, Paul Bolle, Tomasz Nowicki.

   - Intel RAPL (Running Average Power Limits) driver cleanups from
     Jacob Pan.

   - intel_pstate fixes and cleanups from Dirk Brandewie.

   - cpufreq fixes related to system suspend/resume handling from Viresh
     Kumar.

   - cpufreq core fixes and cleanups from Viresh Kumar, Stratos
     Karafotis, Saravana Kannan, Rashika Kheria, Joe Perches.

   - cpufreq drivers updates from Viresh Kumar, Zhuoyu Zhang, Rob
     Herring.

   - cpuidle fixes related to the menu governor from Tuukka Tikkanen.

   - cpuidle fix related to coupled CPUs handling from Paul Burton.

   - Asynchronous execution of all device suspend and resume callbacks,
     except for ->prepare and ->complete, during system suspend and
     resume from Chuansheng Liu.

   - Delayed resuming of runtime-suspended devices during system suspend
     for the PCI bus type and ACPI PM domain.

   - New set of PM helper routines to allow device runtime PM callbacks
     to be used during system suspend and resume more easily from Ulf
     Hansson.

   - Assorted fixes and cleanups in the PM core from Geert Uytterhoeven,
     Prabhakar Lad, Philipp Zabel, Rashika Kheria, Sebastian Capella.

   - devfreq fix from Saravana Kannan"

* tag 'pm+acpi-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (162 commits)
  PM / devfreq: Rewrite devfreq_update_status() to fix multiple bugs
  PM / sleep: Correct whitespace errors in <linux/pm.h>
  intel_pstate: Set core to min P state during core offline
  cpufreq: Add stop CPU callback to cpufreq_driver interface
  cpufreq: Remove unnecessary braces
  cpufreq: Fix checkpatch errors and warnings
  cpufreq: powerpc: add cpufreq transition latency for FSL e500mc SoCs
  MAINTAINERS: Reorder maintainer addresses for PM and ACPI
  PM / Runtime: Update runtime_idle() documentation for return value meaning
  video / output: Drop display output class support
  fujitsu-laptop: Drop unneeded include
  acer-wmi: Stop selecting VIDEO_OUTPUT_CONTROL
  ACPI / gpu / drm: Stop selecting VIDEO_OUTPUT_CONTROL
  ACPI / video: fix ACPI_VIDEO dependencies
  cpufreq: remove unused notifier: CPUFREQ_{SUSPENDCHANGE|RESUMECHANGE}
  cpufreq: Do not allow ->setpolicy drivers to provide ->target
  cpufreq: arm_big_little: set 'physical_cluster' for each CPU
  cpufreq: arm_big_little: make vexpress driver depend on bL core driver
  ACPI / button: Add ACPI Button event via netlink routine
  ACPI: Remove duplicate definitions of PREFIX
  ...
2014-04-01 12:48:54 -07:00
Linus Torvalds 683b6c6f82 Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq code updates from Thomas Gleixner:
 "The irq department proudly presents:

   - Another tree wide sweep of irq infrastructure abuse.  Clear winner
     of the trainwreck engineering contest was:
         #include "../../../kernel/irq/settings.h"

   - Tree wide update of irq_set_affinity() callbacks which miss a cpu
     online check when picking a single cpu out of the affinity mask.

   - Tree wide consolidation of interrupt statistics.

   - Updates to the threaded interrupt infrastructure to allow explicit
     wakeup of the interrupt thread and a variant of synchronize_irq()
     which synchronizes only the hard interrupt handler.  Both are
     needed to replace the homebrewn thread handling in the mmc/sdhci
     code.

   - New irq chip callbacks to allow proper support for GPIO based irqs.
     The GPIO based interrupts need to request/release GPIO resources
     from request/free_irq.

   - A few new ARM interrupt chips.  No revolutionary new hardware, just
     differently wreckaged variations of the scheme.

   - Small improvments, cleanups and updates all over the place"

I was hoping that that trainwreck engineering contest was a April Fools'
joke.  But no.

* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (68 commits)
  irqchip: sun7i/sun6i: Disable NMI before registering the handler
  ARM: sun7i/sun6i: dts: Fix IRQ number for sun6i NMI controller
  ARM: sun7i/sun6i: irqchip: Update the documentation
  ARM: sun7i/sun6i: dts: Add NMI irqchip support
  ARM: sun7i/sun6i: irqchip: Add irqchip driver for NMI controller
  genirq: Export symbol no_action()
  arm: omap: Fix typo in ams-delta-fiq.c
  m68k: atari: Fix the last kernel_stat.h fallout
  irqchip: sun4i: Simplify sun4i_irq_ack
  irqchip: sun4i: Use handle_fasteoi_irq for all interrupts
  genirq: procfs: Make smp_affinity values go+r
  softirq: Add linux/irq.h to make it compile again
  m68k: amiga: Add linux/irq.h to make it compile again
  irqchip: sun4i: Don't ack IRQs > 0, fix acking of IRQ 0
  irqchip: sun4i: Fix a comment about mask register initialization
  irqchip: sun4i: Fix irq 0 not working
  genirq: Add a new IRQCHIP_EOI_THREADED flag
  genirq: Document IRQCHIP_ONESHOT_SAFE flag
  ARM: sunxi: dt: Convert to the new irq controller compatibles
  irqchip: sunxi: Change compatibles
  ...
2014-04-01 11:22:57 -07:00
Wei Liu 09ed3d5ba0 xen/balloon: flush persistent kmaps in correct position
Xen balloon driver will update ballooned out pages' P2M entries to point
to scratch page for PV guests. In 24f69373e2 ("xen/balloon: don't alloc
page while non-preemptible", kmap_flush_unused was moved after updating
P2M table. In that case for 32 bit PV guest we might end up with

  P2M    X -----> S  (S is mfn of balloon scratch page)
  M2P    Y -----> X  (Y is mfn in persistent kmap entry)

kmap_flush_unused() iterates through all the PTEs in the kmap address
space, using pte_to_page() to obtain the page. If the p2m and the m2p
are inconsistent the incorrect page is returned.  This will clear
page->address on the wrong page which may cause subsequent oopses if
that page is currently kmap'ed.

Move the flush back between get_page and __set_phys_to_machine to fix
this.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Cc: stable@vger.kernel.org # 3.12+
2014-03-25 10:38:30 +00:00
Thomas Gleixner 753fbd23f5 xen: Validate online cpus in set_affinity
The user space interface does not filter out offline cpus. It merily
verifies that the mask contains at least one online cpu. So the
selector in the irq chip implementation needs to make sure to pick
only an online cpu because otherwise:

     Offline Core 1
     Set affinity to 0xe
     Selector will pick first set bit, i.e. core 1

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Xen <xen-devel@lists.xenproject.org>
Link: http://lkml.kernel.org/r/20140304203100.978031089@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2014-03-12 13:07:41 +01:00
Thomas Gleixner 99c8b79d3c xen: Add proper irq accounting for HYPERCALL vector
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Xen <xen-devel@lists.xenproject.org>
Link: http://lkml.kernel.org/r/20140223212738.808648133@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2014-03-04 17:37:54 +01:00
Thomas Gleixner 02893afdd3 xen: Get rid of the last irq_desc abuse
Warn if any PIRQ cannot be bound to an event channel. Remove the check
for irq_desc->action. This hypercall never fails in practice so we can
emit a warning unconditionally.

Remove a check for a valid irq desc. The only caller of
xen_destroy_irq() will only do so if the irq was previously fully
setup, which means the descriptor has been allocated as well.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Xen <xen-devel@lists.xenproject.org>
Cc: David Vrabel <david.vrabel@citrix.com>
Link: http://lkml.kernel.org/r/20140223212738.579581220@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2014-03-04 17:37:53 +01:00
Thomas Gleixner 589d03e93f xen: Use the proper irq functions
generic_handler_irq() already tests for !desc so use this instead of
generic_handle_irq_desc().

Use irq_get_irq_data() instead of desc->irq_data.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Xen <xen-devel@lists.xenproject.org>
Link: http://lkml.kernel.org/r/20140223212738.222412125@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2014-03-04 17:37:52 +01:00
Rafael J. Wysocki 700b8422fb ACPI: Drop acpi_evaluate_hotplug_ost() and ACPI_HOTPLUG_OST
Replace acpi_evaluate_hotplug_ost() with acpi_evaluate_ost()
everywhere and drop the ACPI_HOTPLUG_OST symbol so that hotplug
_OST is supported unconditionally.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
2014-02-22 00:50:49 +01:00
Jiang Liu 772c53990f ACPI / PAD / xen: use acpi_evaluate_ost() to replace open-coded version
Use public function acpi_evaluate_ost() to replace open-coded
version of evaluating ACPI _OST method.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-02-21 00:27:47 +01:00
Linus Torvalds 4675348e78 Bug-fix:
- Fix ARM and Xen FIFO not working.
  - Remove more Xen ia64 vestigates.
  - Fix UAPI missing Xen files.
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Merge tag 'stable/for-linus-3.14-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull Xen bugfixes from Konrad Rzeszutek Wilk:
 "This has an healthy amount of code being removed - which we do not use
  anymore (the only user of it was ia64 Xen which had been removed
  already).  The other bug-fixes are to make Xen ARM be able to use the
  new event channel mechanism and proper export of header files to
  user-space.

  Summary:
   - Fix ARM and Xen FIFO not working.
   - Remove more Xen ia64 vestigates.
   - Fix UAPI missing Xen files"

* tag 'stable/for-linus-3.14-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  ia64/xen: Remove Xen support for ia64 even more
  xen: install xen/gntdev.h and xen/gntalloc.h
  xen/events: bind all new interdomain events to VCPU0
2014-02-12 12:28:05 -08:00
Paul Bolle d8320b2d2e ia64/xen: Remove Xen support for ia64 even more
Commit d52eefb47d ("ia64/xen: Remove Xen support for ia64") removed
the Kconfig symbol XEN_XENCOMM. But it didn't remove the code depending
on that symbol. Remove that code now.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Acked-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2014-02-11 10:12:37 -05:00
David Vrabel 97253eeeb7 xen/events: bind all new interdomain events to VCPU0
Commit fc087e1073 (xen/events: remove
unnecessary init_evtchn_cpu_bindings()) causes a regression.

The kernel-side VCPU binding was not being correctly set for newly
allocated or bound interdomain events.  In ARM guests where 2-level
events were used, this would result in no interdomain events being
handled because the kernel-side VCPU masks would all be clear.

x86 guests would work because the irq affinity was set during irq
setup and this would set the correct kernel-side VCPU binding.

Fix this by properly initializing the kernel-side VCPU binding in
bind_evtchn_to_irq().

Reported-and-tested-by: Julien Grall <julien.grall@linaro.org>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2014-02-11 10:12:34 -05:00
Linus Torvalds 1cd731df09 Bug-fixes:
- Revert "xen/grant-table: Avoid m2p_override during mapping" as it broke Xen ARM build.
  - Fix CR4 not being set on AP processors in Xen PVH mode.
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Merge tag 'stable/for-linus-3.14-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull Xen fixes from Konrad Rzeszutek Wilk:
 "Bug-fixes:
   - Revert "xen/grant-table: Avoid m2p_override during mapping" as it
     broke Xen ARM build.
   - Fix CR4 not being set on AP processors in Xen PVH mode"

* tag 'stable/for-linus-3.14-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/pvh: set CR4 flags for APs
  Revert "xen/grant-table: Avoid m2p_override during mapping"
2014-02-05 16:01:11 -08:00
Konrad Rzeszutek Wilk e85fc98055 Revert "xen/grant-table: Avoid m2p_override during mapping"
This reverts commit 08ece5bb23.

As it breaks ARM builds and needs more attention
on the ARM side.

Acked-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2014-02-03 06:44:49 -05:00
Linus Torvalds 14164b46fc Bug-fixes:
- Xen ARM couldn't use the new FIFO events
  - Xen ARM couldn't use the SWIOTLB if compiled as 32-bit with 64-bit PCIe devices.
  - Grant table were doing needless M2P operations.
  - Ratchet down the self-balloon code so it won't OOM.
  - Fix misplaced kfree in Xen PVH error code paths.
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Merge tag 'stable/for-linus-3.14-rc0-late-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull Xen bugfixes from Konrad Rzeszutek Wilk:
 "Bug-fixes for the new features that were added during this cycle.

  There are also two fixes for long-standing issues for which we have a
  solution: grant-table operations extra work that was not needed
  causing performance issues and the self balloon code was too
  aggressive causing OOMs.

  Details:
   - Xen ARM couldn't use the new FIFO events
   - Xen ARM couldn't use the SWIOTLB if compiled as 32-bit with 64-bit PCIe devices.
   - Grant table were doing needless M2P operations.
   - Ratchet down the self-balloon code so it won't OOM.
   - Fix misplaced kfree in Xen PVH error code paths"

* tag 'stable/for-linus-3.14-rc0-late-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/pvh: Fix misplaced kfree from xlated_setup_gnttab_pages
  drivers: xen: deaggressive selfballoon driver
  xen/grant-table: Avoid m2p_override during mapping
  xen/gnttab: Use phys_addr_t to describe the grant frame base address
  xen: swiotlb: handle sizeof(dma_addr_t) != sizeof(phys_addr_t)
  arm/xen: Initialize event channels earlier
2014-01-31 08:38:18 -08:00
Bob Liu bc1b0df59e drivers: xen: deaggressive selfballoon driver
Current xen-selfballoon driver is too aggressive which may cause OOM be
triggered more often. Eg. this bug reported by James:
https://lkml.org/lkml/2013/11/21/158

There are two mainly reasons:
1) The original goal_page didn't consider some pages used by kernel space, like
slab pages and pages used by device drivers.

2) The balloon driver may not give back memory to guest OS fast enough when the
workload suddenly aquries a lot of physical memory.

In both cases, the guest OS will suffer from memory pressure and OOM may
be triggered.

The fix is make xen-selfballoon driver not that aggressive by adding extra 10%
of total ram pages to goal_page.
It's more valuable to keep the guest system reliable and response faster than
balloon out these 10% pages to XEN.

Signed-off-by: Bob Liu <bob.liu@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2014-01-31 09:48:43 -05:00
Zoltan Kiss 08ece5bb23 xen/grant-table: Avoid m2p_override during mapping
The grant mapping API does m2p_override unnecessarily: only gntdev needs it,
for blkback and future netback patches it just cause a lock contention, as
those pages never go to userspace. Therefore this series does the following:
- the original functions were renamed to __gnttab_[un]map_refs, with a new
  parameter m2p_override
- based on m2p_override either they follow the original behaviour, or just set
  the private flag and call set_phys_to_machine
- gnttab_[un]map_refs are now a wrapper to call __gnttab_[un]map_refs with
  m2p_override false
- a new function gnttab_[un]map_refs_userspace provides the old behaviour

It also removes a stray space from page.h and change ret to 0 if
XENFEAT_auto_translated_physmap, as that is the only possible return value
there.

v2:
- move the storing of the old mfn in page->index to gnttab_map_refs
- move the function header update to a separate patch

v3:
- a new approach to retain old behaviour where it needed
- squash the patches into one

v4:
- move out the common bits from m2p* functions, and pass pfn/mfn as parameter
- clear page->private before doing anything with the page, so m2p_find_override
  won't race with this

v5:
- change return value handling in __gnttab_[un]map_refs
- remove a stray space in page.h
- add detail why ret = 0 now at some places

v6:
- don't pass pfn to m2p* functions, just get it locally

Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Suggested-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2014-01-31 09:48:32 -05:00
Julien Grall 47c542050d xen/gnttab: Use phys_addr_t to describe the grant frame base address
On ARM, address size can be 32 bits or 64 bits (if CONFIG_ARCH_PHYS_ADDR_T_64BIT
is enabled).
We can't assume that the grant frame base address will always fits in an
unsigned long. Use phys_addr_t instead of unsigned long as argument for
gnttab_setup_auto_xlat_frames.

Signed-off-by: Julien Grall <julien.grall@linaro.org>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
2014-01-30 12:56:34 +00:00
Ian Campbell e17b2f114c xen: swiotlb: handle sizeof(dma_addr_t) != sizeof(phys_addr_t)
The use of phys_to_machine and machine_to_phys in the phys<=>bus conversions
causes us to lose the top bits of the DMA address if the size of a DMA address is not the same as the size of the phyiscal address.

This can happen in practice on ARM where foreign pages can be above 4GB even
though the local kernel does not have LPAE page tables enabled (which is
totally reasonable if the guest does not itself have >4GB of RAM). In this
case the kernel still maps the foreign pages at a phys addr below 4G (as it
must) but the resulting DMA address (returned by the grant map operation) is
much higher.

This is analogous to a hardware device which has its view of RAM mapped up
high for some reason.

This patch makes I/O to foreign pages (specifically blkif) work on 32-bit ARM
systems with more than 4GB of RAM.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2014-01-30 12:54:20 +00:00
Linus Torvalds 09da8dfa98 ACPI and power management updates for 3.14-rc1
- ACPI core changes to make it create a struct acpi_device object for every
    device represented in the ACPI tables during all namespace scans regardless
    of the current status of that device.  In accordance with this, ACPI hotplug
    operations will not delete those objects, unless the underlying ACPI tables
    go away.
 
  - On top of the above, new sysfs attribute for ACPI device objects allowing
    user space to check device status by triggering the execution of _STA for
    its ACPI object.  From Srinivas Pandruvada.
 
  - ACPI core hotplug changes reducing code duplication, integrating the
    PCI root hotplug with the core and reworking container hotplug.
 
  - ACPI core simplifications making it use ACPI_COMPANION() in the code
    "glueing" ACPI device objects to "physical" devices.
 
  - ACPICA update to upstream version 20131218.  This adds support for the
    DBG2 and PCCT tables to ACPICA, fixes some bugs and improves debug
    facilities.  From Bob Moore, Lv Zheng and Betty Dall.
 
  - Init code change to carry out the early ACPI initialization earlier.
    That should allow us to use ACPI during the timekeeping initialization
    and possibly to simplify the EFI initialization too.  From Chun-Yi Lee.
 
  - Clenups of the inclusions of ACPI headers in many places all over from
    Lv Zheng and Rashika Kheria (work in progress).
 
  - New helper for ACPI _DSM execution and rework of the code in drivers
    that uses _DSM to execute it via the new helper.  From Jiang Liu.
 
  - New Win8 OSI blacklist entries from Takashi Iwai.
 
  - Assorted ACPI fixes and cleanups from Al Stone, Emil Goode, Hanjun Guo,
    Lan Tianyu, Masanari Iida, Oliver Neukum, Prarit Bhargava, Rashika Kheria,
    Tang Chen, Zhang Rui.
 
  - intel_pstate driver updates, including proper Baytrail support, from
    Dirk Brandewie and intel_pstate documentation from Ramkumar Ramachandra.
 
  - Generic CPU boost ("turbo") support for cpufreq from Lukasz Majewski.
 
  - powernow-k6 cpufreq driver fixes from Mikulas Patocka.
 
  - cpufreq core fixes and cleanups from Viresh Kumar, Jane Li, Mark Brown.
 
  - Assorted cpufreq drivers fixes and cleanups from Anson Huang, John Tobias,
    Paul Bolle, Paul Walmsley, Sachin Kamat, Shawn Guo, Viresh Kumar.
 
  - cpuidle cleanups from Bartlomiej Zolnierkiewicz.
 
  - Support for hibernation APM events from Bin Shi.
 
  - Hibernation fix to avoid bringing up nonboot CPUs with ACPI EC disabled
    during thaw transitions from Bjørn Mork.
 
  - PM core fixes and cleanups from Ben Dooks, Leonardo Potenza, Ulf Hansson.
 
  - PNP subsystem fixes and cleanups from Dmitry Torokhov, Levente Kurusa,
    Rashika Kheria.
 
  - New tool for profiling system suspend from Todd E Brandt and a cpupower
    tool cleanup from One Thousand Gnomes.
 
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Merge tag 'pm+acpi-3.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI and power management updates from Rafael Wysocki:
 "As far as the number of commits goes, the top spot belongs to ACPI
  this time with cpufreq in the second position and a handful of PM
  core, PNP and cpuidle updates.  They are fixes and cleanups mostly, as
  usual, with a couple of new features in the mix.

  The most visible change is probably that we will create struct
  acpi_device objects (visible in sysfs) for all devices represented in
  the ACPI tables regardless of their status and there will be a new
  sysfs attribute under those objects allowing user space to check that
  status via _STA.

  Consequently, ACPI device eject or generally hot-removal will not
  delete those objects, unless the table containing the corresponding
  namespace nodes is unloaded, which is extremely rare.  Also ACPI
  container hotplug will be handled quite a bit differently and cpufreq
  will support CPU boost ("turbo") generically and not only in the
  acpi-cpufreq driver.

  Specifics:

   - ACPI core changes to make it create a struct acpi_device object for
     every device represented in the ACPI tables during all namespace
     scans regardless of the current status of that device.  In
     accordance with this, ACPI hotplug operations will not delete those
     objects, unless the underlying ACPI tables go away.

   - On top of the above, new sysfs attribute for ACPI device objects
     allowing user space to check device status by triggering the
     execution of _STA for its ACPI object.  From Srinivas Pandruvada.

   - ACPI core hotplug changes reducing code duplication, integrating
     the PCI root hotplug with the core and reworking container hotplug.

   - ACPI core simplifications making it use ACPI_COMPANION() in the
     code "glueing" ACPI device objects to "physical" devices.

   - ACPICA update to upstream version 20131218.  This adds support for
     the DBG2 and PCCT tables to ACPICA, fixes some bugs and improves
     debug facilities.  From Bob Moore, Lv Zheng and Betty Dall.

   - Init code change to carry out the early ACPI initialization
     earlier.  That should allow us to use ACPI during the timekeeping
     initialization and possibly to simplify the EFI initialization too.
     From Chun-Yi Lee.

   - Clenups of the inclusions of ACPI headers in many places all over
     from Lv Zheng and Rashika Kheria (work in progress).

   - New helper for ACPI _DSM execution and rework of the code in
     drivers that uses _DSM to execute it via the new helper.  From
     Jiang Liu.

   - New Win8 OSI blacklist entries from Takashi Iwai.

   - Assorted ACPI fixes and cleanups from Al Stone, Emil Goode, Hanjun
     Guo, Lan Tianyu, Masanari Iida, Oliver Neukum, Prarit Bhargava,
     Rashika Kheria, Tang Chen, Zhang Rui.

   - intel_pstate driver updates, including proper Baytrail support,
     from Dirk Brandewie and intel_pstate documentation from Ramkumar
     Ramachandra.

   - Generic CPU boost ("turbo") support for cpufreq from Lukasz
     Majewski.

   - powernow-k6 cpufreq driver fixes from Mikulas Patocka.

   - cpufreq core fixes and cleanups from Viresh Kumar, Jane Li, Mark
     Brown.

   - Assorted cpufreq drivers fixes and cleanups from Anson Huang, John
     Tobias, Paul Bolle, Paul Walmsley, Sachin Kamat, Shawn Guo, Viresh
     Kumar.

   - cpuidle cleanups from Bartlomiej Zolnierkiewicz.

   - Support for hibernation APM events from Bin Shi.

   - Hibernation fix to avoid bringing up nonboot CPUs with ACPI EC
     disabled during thaw transitions from Bjørn Mork.

   - PM core fixes and cleanups from Ben Dooks, Leonardo Potenza, Ulf
     Hansson.

   - PNP subsystem fixes and cleanups from Dmitry Torokhov, Levente
     Kurusa, Rashika Kheria.

   - New tool for profiling system suspend from Todd E Brandt and a
     cpupower tool cleanup from One Thousand Gnomes"

* tag 'pm+acpi-3.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (153 commits)
  thermal: exynos: boost: Automatic enable/disable of BOOST feature (at Exynos4412)
  cpufreq: exynos4x12: Change L0 driver data to CPUFREQ_BOOST_FREQ
  Documentation: cpufreq / boost: Update BOOST documentation
  cpufreq: exynos: Extend Exynos cpufreq driver to support boost
  cpufreq / boost: Kconfig: Support for software-managed BOOST
  acpi-cpufreq: Adjust the code to use the common boost attribute
  cpufreq: Add boost frequency support in core
  intel_pstate: Add trace point to report internal state.
  cpufreq: introduce cpufreq_generic_get() routine
  ARM: SA1100: Create dummy clk_get_rate() to avoid build failures
  cpufreq: stats: create sysfs entries when cpufreq_stats is a module
  cpufreq: stats: free table and remove sysfs entry in a single routine
  cpufreq: stats: remove hotplug notifiers
  cpufreq: stats: handle cpufreq_unregister_driver() and suspend/resume properly
  cpufreq: speedstep: remove unused speedstep_get_state
  platform: introduce OF style 'modalias' support for platform bus
  PM / tools: new tool for suspend/resume performance optimization
  ACPI: fix module autoloading for ACPI enumerated devices
  ACPI: add module autoloading support for ACPI enumerated devices
  ACPI: fix create_modalias() return value handling
  ...
2014-01-24 15:51:02 -08:00
Linus Torvalds 84621c9b18 Features:
- FIFO event channels. Key advantages: support for over 100,000 events (2^17),
    16 different event priorities, improved fairness in event latency through
    the use of FIFOs.
  - Xen PVH support. "It’s a fully PV kernel mode, running with paravirtualized
    disk and network, paravirtualized interrupts and timers, no emulated devices
    of any kind (and thus no qemu), no BIOS or legacy boot — but instead of
    requiring PV MMU, it uses the HVM hardware extensions to virtualize the
    pagetables, as well as system calls and other privileged operations."
    (from "The Paravirtualization Spectrum, Part 2: From poles to a spectrum")
 Bug-fixes:
  - Fixes in balloon driver (refactor and make it work under ARM)
  - Allow xenfb to be used in HVM guests.
  - Allow xen_platform_pci=0 to work properly.
  - Refactors in event channels.
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Merge tag 'stable/for-linus-3.14-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull Xen updates from Konrad Rzeszutek Wilk:
 "Two major features that Xen community is excited about:

  The first is event channel scalability by David Vrabel - we switch
  over from an two-level per-cpu bitmap of events (IRQs) - to an FIFO
  queue with priorities.  This lets us be able to handle more events,
  have lower latency, and better scalability.  Good stuff.

  The other is PVH by Mukesh Rathor.  In short, PV is a mode where the
  kernel lets the hypervisor program page-tables, segments, etc.  With
  EPT/NPT capabilities in current processors, the overhead of doing this
  in an HVM (Hardware Virtual Machine) container is much lower than the
  hypervisor doing it for us.

  In short we let a PV guest run without doing page-table, segment,
  syscall, etc updates through the hypervisor - instead it is all done
  within the guest container.  It is a "hybrid" PV - hence the 'PVH'
  name - a PV guest within an HVM container.

  The major benefits are less code to deal with - for example we only
  use one function from the the pv_mmu_ops (which has 39 function
  calls); faster performance for syscall (no context switches into the
  hypervisor); less traps on various operations; etc.

  It is still being baked - the ABI is not yet set in stone.  But it is
  pretty awesome and we are excited about it.

  Lastly, there are some changes to ARM code - you should get a simple
  conflict which has been resolved in #linux-next.

  In short, this pull has awesome features.

  Features:
   - FIFO event channels.  Key advantages: support for over 100,000
     events (2^17), 16 different event priorities, improved fairness in
     event latency through the use of FIFOs.
   - Xen PVH support.  "It’s a fully PV kernel mode, running with
     paravirtualized disk and network, paravirtualized interrupts and
     timers, no emulated devices of any kind (and thus no qemu), no BIOS
     or legacy boot — but instead of requiring PV MMU, it uses the HVM
     hardware extensions to virtualize the pagetables, as well as system
     calls and other privileged operations." (from "The
     Paravirtualization Spectrum, Part 2: From poles to a spectrum")

  Bug-fixes:
   - Fixes in balloon driver (refactor and make it work under ARM)
   - Allow xenfb to be used in HVM guests.
   - Allow xen_platform_pci=0 to work properly.
   - Refactors in event channels"

* tag 'stable/for-linus-3.14-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: (52 commits)
  xen/pvh: Set X86_CR0_WP and others in CR0 (v2)
  MAINTAINERS: add git repository for Xen
  xen/pvh: Use 'depend' instead of 'select'.
  xen: delete new instances of __cpuinit usage
  xen/fb: allow xenfb initialization for hvm guests
  xen/evtchn_fifo: fix error return code in evtchn_fifo_setup()
  xen-platform: fix error return code in platform_pci_init()
  xen/pvh: remove duplicated include from enlighten.c
  xen/pvh: Fix compile issues with xen_pvh_domain()
  xen: Use dev_is_pci() to check whether it is pci device
  xen/grant-table: Force to use v1 of grants.
  xen/pvh: Support ParaVirtualized Hardware extensions (v3).
  xen/pvh: Piggyback on PVHVM XenBus.
  xen/pvh: Piggyback on PVHVM for grant driver (v4)
  xen/grant: Implement an grant frame array struct (v3).
  xen/grant-table: Refactor gnttab_init
  xen/grants: Remove gnttab_max_grant_frames dependency on gnttab_init.
  xen/pvh: Piggyback on PVHVM for event channels (v2)
  xen/pvh: Update E820 to work with PVH (v2)
  xen/pvh: Secondary VCPU bringup (non-bootup CPUs)
  ...
2014-01-22 22:00:18 -08:00
Linus Torvalds bb1281f2aa Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
Pull trivial tree updates from Jiri Kosina:
 "Usual rocket science stuff from trivial.git"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (39 commits)
  neighbour.h: fix comment
  sched: Fix warning on make htmldocs caused by wait.h
  slab: struct kmem_cache is protected by slab_mutex
  doc: Fix typo in USB Gadget Documentation
  of/Kconfig: Spelling s/one/once/
  mkregtable: Fix sscanf handling
  lp5523, lp8501: comment improvements
  thermal: rcar: comment spelling
  treewide: fix comments and printk msgs
  IXP4xx: remove '1 &&' from a condition check in ixp4xx_restart()
  Documentation: update /proc/uptime field description
  Documentation: Fix size parameter for snprintf
  arm: fix comment header and macro name
  asm-generic: uaccess: Spelling s/a ny/any/
  mtd: onenand: fix comment header
  doc: driver-model/platform.txt: fix a typo
  drivers: fix typo in DEVTMPFS_MOUNT Kconfig help text
  doc: Fix typo (acces_process_vm -> access_process_vm)
  treewide: Fix typos in printk
  drivers/gpu/drm/qxl/Kconfig: reformat the help text
  ...
2014-01-22 21:21:55 -08:00
Rafael J. Wysocki 25d412d932 Merge branch 'acpi-hotplug'
* acpi-hotplug:
  ACPI / scan: ACPI device object sysfs attribute for _STA evaluation
  ACPI / hotplug / driver core: Handle containers in a special way
  ACPI / hotplug: Add demand_offline hotplug profile flag
  ACPI / bind: Move acpi_get_child() to drivers/ide/ide-acpi.c
  ACPI / bind: Pass struct acpi_device pointer to acpi_bind_one()
  ACPI / bind: Rework struct acpi_bus_type
  ACPI / bind: Redefine acpi_preset_companion()
  ACPI / bind: Redefine acpi_get_child()
  PCI / ACPI: Use acpi_find_child_device() for child devices lookup
  ACPI / bind: Simplify child device lookups
  ACPI / scan: Use direct recurrence for device hierarchy walks
  ACPI: Introduce acpi_set_device_status()
  ACPI / hotplug: Drop unfinished global notification handling routines
  ACPI / hotplug: Rework generic code to handle suprise removals
  ACPI / hotplug: Move container-specific code out of the core
  ACPI / hotplug: Make ACPI PCI root hotplug use common hotplug code
  ACPI / hotplug: Introduce common hotplug function acpi_device_hotplug()
  ACPI / hotplug: Do not fail bus and device checks for disabled hotplug
  ACPI / scan: Add acpi_device objects for all device nodes in the namespace
  ACPI / scan: Define non-empty device removal handler
2014-01-12 23:45:04 +01:00
Rafael J. Wysocki 98feb7cc61 Merge branch 'acpi-cleanup'
* acpi-cleanup: (22 commits)
  ACPI / tables: Return proper error codes from acpi_table_parse() and fix comment.
  ACPI / tables: Check if id is NULL in acpi_table_parse()
  ACPI / proc: Include appropriate header file in proc.c
  ACPI / EC: Remove unused functions and add prototype declaration in internal.h
  ACPI / dock: Include appropriate header file in dock.c
  ACPI / PCI: Include appropriate header file in pci_link.c
  ACPI / PCI: Include appropriate header file in pci_slot.c
  ACPI / EC: Mark the function acpi_ec_add_debugfs() as static in ec_sys.c
  ACPI / NVS: Include appropriate header file in nvs.c
  ACPI / OSL: Mark the function acpi_table_checksum() as static
  ACPI / processor: initialize a variable to silence compiler warning
  ACPI / processor: use ACPI_COMPANION() to get ACPI device
  ACPI: correct minor typos
  ACPI / sleep: Drop redundant acpi_disabled check
  ACPI / dock: Drop redundant acpi_disabled check
  ACPI / table: Replace '1' with specific error return values
  ACPI: remove trailing whitespace
  ACPI / IBFT: Fix incorrect <acpi/acpi.h> inclusion in iSCSI boot firmware module
  ACPI / i915: Fix incorrect <acpi/acpi.h> inclusions via <linux/acpi_io.h>
  SFI / ACPI: Fix warnings reported during builds with W=1
  ...

Conflicts:
	drivers/acpi/nvs.c
	drivers/hwmon/asus_atk0110.c
2014-01-12 23:44:09 +01:00
Paul Gortmaker 0db6991dd2 xen: delete new instances of __cpuinit usage
Commit 1fe565517b ("xen/events: use
the FIFO-based ABI if available") added new instances of __cpuinit
macro usage.

We removed this a couple versions ago; we now want to remove
the compat no-op stubs.  Introducing new users is not what
we want to see at this point in time, as it will break once
the stubs are gone.

Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2014-01-10 10:44:43 -05:00
Wei Yongjun be1403b9e6 xen/evtchn_fifo: fix error return code in evtchn_fifo_setup()
Fix to return -ENOMEM from the error handling case instead of
0 (overwrited to 0 by the HYPERVISOR_event_channel_op call),
otherwise the error condition cann't be reflected from the
return value.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
2014-01-07 09:59:52 -05:00
Wei Yongjun 89b9e08f18 xen-platform: fix error return code in platform_pci_init()
Fix to return a negative error code from the error handling
case instead of 0, otherwise the error condition cann't be
reflected from the return value.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2014-01-07 09:59:51 -05:00
Yijing Wang 89c3cf52c7 xen: Use dev_is_pci() to check whether it is pci device
Use PCI standard marco dev_is_pci() instead of directly compare
pci_bus_type to check whether it is pci device.

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Jan Beulich <JBeulich@suse.com>
2014-01-07 09:53:33 -05:00
Konrad Rzeszutek Wilk 11c7ff17c9 xen/grant-table: Force to use v1 of grants.
We have the framework to use v2, but there are no backends that
actually use it. The end result is that on PV we use v2 grants
and on PVHVM v1. The v1 has a capacity of 512 grants per page while
the v2 has 256 grants per page. This means we lose about 50%
capacity - and if we want more than 16 VIFs (each VIF takes
512 grants), then we are hitting the max per guest of 32.

Oracle-bug: 16039922
CC: annie.li@oracle.com
CC: msw@amazon.com
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
2014-01-06 10:44:39 -05:00
Mukesh Rathor be3e9cf330 xen/pvh: Piggyback on PVHVM XenBus.
PVH is a PV guest with a twist - there are certain things
that work in it like HVM and some like PV. For the XenBus
mechanism we want to use the PVHVM mechanism.

Signed-off-by: Mukesh Rathor <mukesh.rathor@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2014-01-06 10:44:23 -05:00
Konrad Rzeszutek Wilk 6926f6d610 xen/pvh: Piggyback on PVHVM for grant driver (v4)
In PVH the shared grant frame is the PFN and not MFN,
hence its mapped via the same code path as HVM.

The allocation of the grant frame is done differently - we
do not use the early platform-pci driver and have an
ioremap area - instead we use balloon memory and stitch
all of the non-contingous pages in a virtualized area.

That means when we call the hypervisor to replace the GMFN
with a XENMAPSPACE_grant_table type, we need to lookup the
old PFN for every iteration instead of assuming a flat
contingous PFN allocation.

Lastly, we only use v1 for grants. This is because PVHVM
is not able to use v2 due to no XENMEM_add_to_physmap
calls on the error status page (see commit
69e8f430e2
 xen/granttable: Disable grant v2 for HVM domains.)

Until that is implemented this workaround has to
be in place.

Also per suggestions by Stefano utilize the PVHVM paths
as they share common functionality.

v2 of this patch moves most of the PVH code out in the
arch/x86/xen/grant-table driver and touches only minimally
the generic driver.

v3, v4: fixes us some of the code due to earlier patches.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2014-01-06 10:44:21 -05:00
Konrad Rzeszutek Wilk efaf30a335 xen/grant: Implement an grant frame array struct (v3).
The 'xen_hvm_resume_frames' used to be an 'unsigned long'
and contain the virtual address of the grants. That was OK
for most architectures (PVHVM, ARM) were the grants are contiguous
in memory. That however is not the case for PVH - in which case
we will have to do a lookup for each virtual address for the PFN.

Instead of doing that, lets make it a structure which will contain
the array of PFNs, the virtual address and the count of said PFNs.

Also provide a generic functions: gnttab_setup_auto_xlat_frames and
gnttab_free_auto_xlat_frames to populate said structure with
appropriate values for PVHVM and ARM.

To round it off, change the name from 'xen_hvm_resume_frames' to
a more descriptive one - 'xen_auto_xlat_grant_frames'.

For PVH, in patch "xen/pvh: Piggyback on PVHVM for grant driver"
we will populate the 'xen_auto_xlat_grant_frames' by ourselves.

v2 moves the xen_remap in the gnttab_setup_auto_xlat_frames
and also introduces xen_unmap for gnttab_free_auto_xlat_frames.

Suggested-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
[v3: Based on top of 'asm/xen/page.h: remove redundant semicolon']
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2014-01-06 10:44:20 -05:00
Konrad Rzeszutek Wilk 456847533b xen/grant-table: Refactor gnttab_init
We have this odd scenario of where for PV paths we take a shortcut
but for the HVM paths we first ioremap xen_hvm_resume_frames, then
assign it to gnttab_shared.addr. This is needed because gnttab_map
uses gnttab_shared.addr.

Instead of having:
	if (pv)
		return gnttab_map
	if (hvm)
		...

	gnttab_map

Lets move the HVM part before the gnttab_map and remove the
first call to gnttab_map.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2014-01-06 10:44:18 -05:00
Konrad Rzeszutek Wilk 7f256020cc xen/grants: Remove gnttab_max_grant_frames dependency on gnttab_init.
The function gnttab_max_grant_frames() returns the maximum amount
of frames (pages) of grants we can have. Unfortunatly it was
dependent on gnttab_init() having been run before to initialize
the boot max value (boot_max_nr_grant_frames).

This meant that users of gnttab_max_grant_frames would always
get a zero value if they called before gnttab_init() - such as
'platform_pci_init' (drivers/xen/platform-pci.c).

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2014-01-06 10:44:16 -05:00
Mukesh Rathor 2771374d47 xen/pvh: Piggyback on PVHVM for event channels (v2)
PVH is a PV guest with a twist - there are certain things
that work in it like HVM and some like PV. There is
a similar mode - PVHVM where we run in HVM mode with
PV code enabled - and this patch explores that.

The most notable PV interfaces are the XenBus and event channels.

We will piggyback on how the event channel mechanism is
used in PVHVM - that is we want the normal native IRQ mechanism
and we will install a vector (hvm callback) for which we
will call the event channel mechanism.

This means that from a pvops perspective, we can use
native_irq_ops instead of the Xen PV specific. Albeit in the
future we could support pirq_eoi_map. But that is
a feature request that can be shared with PVHVM.

Signed-off-by: Mukesh Rathor <mukesh.rathor@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2014-01-06 10:44:15 -05:00
David Vrabel 1fe565517b xen/events: use the FIFO-based ABI if available
Implement all the event channel port ops for the FIFO-based ABI.

If the hypervisor supports the FIFO-based ABI, enable it by
initializing the control block for the boot VCPU and subsequent VCPUs
as they are brought up and on resume.  The event array is expanded as
required when event ports are setup.

The 'xen.fifo_events=0' command line option may be used to disable use
of the FIFO-based ABI.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2014-01-06 10:07:57 -05:00
David Vrabel 6ccecb0fbc xen/events: allow event channel priority to be set
Add xen_irq_set_priority() to set an event channels priority.  This function
will only work with event channel ABIs that support priority (i.e., the
FIFO-based ABI).

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2014-01-06 10:07:54 -05:00
David Vrabel bf2bbe07f1 xen/events: Add the hypervisor interface for the FIFO-based event channels
Add the hypercall sub-ops and the structures for the shared data used
in the FIFO-based event channel ABI.

The design document for this new ABI is available here:

    http://xenbits.xen.org/people/dvrabel/event-channels-H.pdf

In summary, events are reported using a per-domain shared event array
of event words.  Each event word has PENDING, LINKED and MASKED bits
and a LINK field for pointing to the next event in the event queue.

There are 16 event queues (with different priorities) per-VCPU.

Key advantages of this new ABI include:

- Support for over 100,000 events (2^17).
- 16 different event priorities.
- Improved fairness in event latency through the use of FIFOs.

The ABI is available in Xen 4.4 and later.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2014-01-06 10:07:52 -05:00
David Vrabel 0dc0064add xen/evtchn: support more than 4096 ports
Remove the check during unbind for NR_EVENT_CHANNELS as this limits
support to less than 4096 ports.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2014-01-06 10:07:50 -05:00
David Vrabel fd21069dfe xen/events: add xen_evtchn_mask_all()
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2014-01-06 10:07:49 -05:00
David Vrabel d0b075ffee xen/events: Refactor evtchn_to_irq array to be dynamically allocated
Refactor static array evtchn_to_irq array to be dynamically allocated by
implementing get and set functions for accesses to the array.

Two new port ops are added: max_channels (maximum supported number of
event channels) and nr_channels (number of currently usable event
channels).  For the 2-level ABI, these numbers are both the same as
the shared data structure is a fixed size. For the FIFO ABI, these
will be different as the event array is expanded dynamically.

This allows more than 65000 event channels so an unsigned short is no
longer sufficient for an event channel port number and unsigned int is
used instead.

Signed-off-by: Malcolm Crossley <malcolm.crossley@citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2014-01-06 10:07:47 -05:00
David Vrabel 083858758f xen/events: add a evtchn_op for port setup
Add a hook for port-specific setup and call it from
xen_irq_info_common_setup().

The FIFO-based ABIs may need to perform additional setup (expanding
the event array) before a bound event channel can start to receive
events.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2014-01-06 10:07:46 -05:00
David Vrabel 96d4c58818 xen/events: allow setup of irq_info to fail
The FIFO-based event ABI requires additional setup of newly bound
events (it may need to expand the event array) and this setup may
fail.

xen_irq_info_common_init() is a useful place to put this setup so
allow this call to fail.  This call and the other similar calls are
renamed to be *_setup() to reflect that they may now fail.

This failure can only occur with new event channels not on rebind.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2014-01-06 10:07:44 -05:00
David Vrabel ab9a1cca3d xen/events: add struct evtchn_ops for the low-level port operations
evtchn_ops contains the low-level operations that access the shared
data structures.  This allows alternate ABIs to be supported.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2014-01-06 10:07:43 -05:00
David Vrabel 9a489f45a1 xen/events: move 2-level specific code into its own file
In preparation for alternative event channel ABIs, move all the
functions accessing the shared data structures into their own file.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2014-01-06 10:07:41 -05:00
David Vrabel d2ba3166f2 xen/events: move drivers/xen/events.c into drivers/xen/events/
events.c will be split into multiple files so move it into its own
directory.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2014-01-06 10:07:38 -05:00
Wei Liu 76ec8d64ce xen/events: replace raw bit ops with functions
In preparation for adding event channel port ops, use set_evtchn()
instead of sync_set_bit().

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2014-01-06 10:07:36 -05:00
Wei Liu 3f70fa8282 xen/events: introduce test_and_set_mask()
In preparation for adding event channel port ops, add
test_and_set_mask().

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2014-01-06 10:07:35 -05:00
David Vrabel fc087e1073 xen/events: remove unnecessary init_evtchn_cpu_bindings()
Because the guest-side binding of an event to a VCPU (i.e., setting
the local per-cpu masks) is always explicitly done after an event
channel is bound to a port, there is no need to initialize all
possible events as bound to VCPU 0 at start of day or after a resume.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2014-01-06 10:07:33 -05:00
David Vrabel 8729518506 xen/events: refactor retrigger_dynirq() and resend_irq_on_evtchn()
These two function did the same thing with different parameters, put
the common bits in retrigger_evtchn().

This changes the return value of resend_irq_on_evtchn() but the only
caller (in arch/ia64/xen/irq_xen.c) ignored the return value so this
is fine.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2014-01-06 10:07:32 -05:00