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  1. 17 Sep, 2020 2 commits
    • Grzegorz Jaszczyk's avatar
      irqchip/irq-pruss-intc: Add a PRUSS irqchip driver for PRUSS interrupts · 04e2d1e0
      Grzegorz Jaszczyk authored 
      The Programmable Real-Time Unit Subsystem (PRUSS) contains a local
interrupt controller (INTC) that can handle various system input events
and post interrupts back to the device-level initiators. The INTC can
support upto 64 input events with individual control configuration and
hardware prioritization. These events are mapped onto 10 output interrupt
lines through two levels of many-to-one mapping support. Different
interrupt lines are routed to the individual PRU cores or to the host
CPU, or to other devices on the SoC. Some of these events are sourced
from peripherals or other sub-modules within that PRUSS, while a few
others are sourced from SoC-level peripherals/devices.

The PRUSS INTC platform driver manages this PRUSS interrupt controller
and implements an irqchip driver to provide a Linux standard way for
the PRU client users to enable/disable/ack/re-trigger a PRUSS system
event. The system events to interrupt channels and output interrupts
relies on the mapping configuration provided either through the PRU
firmware blob (for interrupts routed to PRU cores) or via the PRU
application's device tree node (for interrupt routed to the main CPU).
In the first case the mappings will be programmed on PRU remoteproc
driver demand (via irq_create_fwspec_mapping) during the boot of a PRU
core and cleaned up after the PRU core is stopped.

Reference counting is used to allow multiple system events to share a
single channel and to allow multiple channels to share a single host
event.

The PRUSS INTC module is reference counted during the interrupt
setup phase through the irqchip's irq_request_resources() and
irq_release_resources() ops. This restricts the module from being
removed as long as there are active interrupt users.

The driver currently supports and can be built for OMAP architecture
based AM335x, AM437x and AM57xx SoCs; Keystone2 architecture based
66AK2G SoCs and Davinci architecture based OMAP-L13x/AM18x/DA850 SoCs.
All of these SoCs support 64 system events, 10 interrupt channels and
10 output interrupt lines per PRUSS INTC with a few SoC integration
differences.

NOTE:
Each PRU-ICSS's INTC on AM57xx SoCs is preceded by a Crossbar that
enables multiple external events to be routed to a specific number
of input interrupt events. Any non-default external interrupt event
directed towards PRUSS needs this crossbar to be setup properly.
Co-developed-by: default avatarSuman Anna <s-anna@ti.com>
Co-developed-by: default avatarAndrew F. Davis <afd@ti.com>
Co-developed-by: default avatarRoger Quadros <rogerq@ti.com>
Co-developed-by: default avatarDavid Lechner <david@lechnology.com>
Signed-off-by: default avatarSuman Anna <s-anna@ti.com>
Signed-off-by: default avatarAndrew F. Davis <afd@ti.com>
Signed-off-by: default avatarRoger Quadros <rogerq@ti.com>
Signed-off-by: default avatarDavid Lechner <david@lechnology.com>
Signed-off-by: default avatarGrzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
      04e2d1e0
    • Suman Anna's avatar
      dt-bindings: irqchip: Add PRU-ICSS interrupt controller bindings · 8a1b09ed
      Suman Anna authored 
      The Programmable Real-Time Unit and Industrial Communication Subsystem
(PRU-ICSS or simply PRUSS) contains an interrupt controller (INTC) that
can handle various system input events and post interrupts back to the
device-level initiators. The INTC can support up to 64 input events on
most SoCs with individual control configuration and h/w prioritization.
These events are mapped onto 10 output interrupt lines through two levels
of many-to-one mapping support. Different interrupt lines are routed to
the individual PRU cores or to the host CPU or to other PRUSS instances.

The K3 AM65x and J721E SoCs have the next generation of the PRU-ICSS IP,
commonly called ICSSG. The ICSSG interrupt controller on K3 SoCs provide
a higher number of host interrupts (20 vs 10) and can handle an increased
number of input events (160 vs 64) from various SoC interrupt sources.

Add the bindings document for these interrupt controllers on all the
applicable SoCs. It covers the OMAP architecture SoCs - AM33xx, AM437x
and AM57xx; the Keystone 2 architecture based 66AK2G SoC; the Davinci
architecture based OMAPL138 SoCs, and the K3 architecture based AM65x
and J721E SoCs.
Co-developed-by: default avatarAndrew F. Davis <afd@ti.com>
Co-developed-by: default avatarRoger Quadros <rogerq@ti.com>
Co-developed-by: default avatarGrzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
Signed-off-by: default avatarAndrew F. Davis <afd@ti.com>
Signed-off-by: default avatarRoger Quadros <rogerq@ti.com>
Signed-off-by: default avatarSuman Anna <s-anna@ti.com>
Signed-off-by: default avatarGrzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
      8a1b09ed
  3. 07 Sep, 2020 1 commit
  5. 06 Sep, 2020 4 commits
    • Linus Torvalds's avatar
      Merge tag 'io_uring-5.9-2020-09-06' of git://git.kernel.dk/linux-block · a8205e31
      Linus Torvalds authored 
      Pull more io_uring fixes from Jens Axboe:
 "Two followup fixes. One is fixing a regression from this merge window,
  the other is two commits fixing cancelation of deferred requests.

  Both have gone through full testing, and both spawned a few new
  regression test additions to liburing.

   - Don't play games with const, properly store the output iovec and
     assign it as needed.

   - Deferred request cancelation fix (Pavel)"

* tag 'io_uring-5.9-2020-09-06' of git://git.kernel.dk/linux-block:
  io_uring: fix linked deferred ->files cancellation
  io_uring: fix cancel of deferred reqs with ->files
  io_uring: fix explicit async read/write mapping for large segments
      a8205e31
    • Linus Torvalds's avatar
      Merge tag 'iommu-fixes-v5.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu · 2ccdd9f8
      Linus Torvalds authored 
      Pull iommu fixes from Joerg Roedel:

 - three Intel VT-d fixes to fix address handling on 32bit, fix a NULL
   pointer dereference bug and serialize a hardware register access as
   required by the VT-d spec.

 - two patches for AMD IOMMU to force AMD GPUs into translation mode
   when memory encryption is active and disallow using IOMMUv2
   functionality.  This makes the AMDGPU driver work when memory
   encryption is active.

 - two more fixes for AMD IOMMU to fix updating the Interrupt Remapping
   Table Entries.

 - MAINTAINERS file update for the Qualcom IOMMU driver.

* tag 'iommu-fixes-v5.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/vt-d: Handle 36bit addressing for x86-32
  iommu/amd: Do not use IOMMUv2 functionality when SME is active
  iommu/amd: Do not force direct mapping when SME is active
  iommu/amd: Use cmpxchg_double() when updating 128-bit IRTE
  iommu/amd: Restore IRTE.RemapEn bit after programming IRTE
  iommu/vt-d: Fix NULL pointer dereference in dev_iommu_priv_set()
  iommu/vt-d: Serialize IOMMU GCMD register modifications
  MAINTAINERS: Update QUALCOMM IOMMU after Arm SMMU drivers move
      2ccdd9f8
    • Linus Torvalds's avatar
      Merge tag 'x86-urgent-2020-09-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 015b3155
      Linus Torvalds authored 
      Pull x86 fixes from Ingo Molnar:

 - more generic entry code ABI fallout

 - debug register handling bugfixes

 - fix vmalloc mappings on 32-bit kernels

 - kprobes instrumentation output fix on 32-bit kernels

 - fix over-eager WARN_ON_ONCE() on !SMAP hardware

 - NUMA debugging fix

 - fix Clang related crash on !RETPOLINE kernels

* tag 'x86-urgent-2020-09-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/entry: Unbreak 32bit fast syscall
  x86/debug: Allow a single level of #DB recursion
  x86/entry: Fix AC assertion
  tracing/kprobes, x86/ptrace: Fix regs argument order for i386
  x86, fakenuma: Fix invalid starting node ID
  x86/mm/32: Bring back vmalloc faulting on x86_32
  x86/cmdline: Disable jump tables for cmdline.c
      015b3155
    • Linus Torvalds's avatar
      Merge tag 'for-linus-5.9-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip · 68beef57
      Linus Torvalds authored 
      Pull xen updates from Juergen Gross:
 "A small series for fixing a problem with Xen PVH guests when running
  as backends (e.g. as dom0).

  Mapping other guests' memory is now working via ZONE_DEVICE, thus not
  requiring to abuse the memory hotplug functionality for that purpose"

* tag 'for-linus-5.9-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen: add helpers to allocate unpopulated memory
  memremap: rename MEMORY_DEVICE_DEVDAX to MEMORY_DEVICE_GENERIC
  xen/balloon: add header guard
      68beef57
  7. 05 Sep, 2020 28 commits
  9. 04 Sep, 2020 5 commits
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