linux-toradex.git/arch/powerpc/kernel/pci-common.c, branch v4.4.144

powerpc/pci: export pcibios_free_controller()

2015-10-15T09:31:57+00:00

Export pcibios_free_controller(), so it can be used by the cxl module to
free virtual PHBs.

Signed-off-by: Andrew Donnellan 
Signed-off-by: Michael Ellerman

PCI: Revert "PCI: Call pci_read_bridge_bases() from core instead of arch code"

2015-09-15T18:18:04+00:00

Revert dff22d2054b5 ("PCI: Call pci_read_bridge_bases() from core instead
of arch code").

Reading PCI bridge windows is not arch-specific in itself, but there is PCI
core code that doesn't work correctly if we read them too early. For
example, Hannes found this case on an ARM Freescale i.mx6 board:

pci_bus 0000:00: root bus resource [mem 0x01000000-0x01efffff]
pci 0000:00:00.0: PCI bridge to [bus 01-ff]
pci 0000:00:00.0: BAR 8: no space for [mem size 0x01000000] (mem window)
pci 0000:01:00.0: BAR 2: failed to assign [mem size 0x00200000]
pci 0000:01:00.0: BAR 1: failed to assign [mem size 0x00004000]
pci 0000:01:00.0: BAR 0: failed to assign [mem size 0x00000100]

The 00:00.0 mem window needs to be at least 3MB: the 01:00.0 device needs
0x204100 of space, and mem windows are megabyte-aligned.

Bus sizing can increase a bridge window size, but never *decrease* it (see
d65245c3297a ("PCI: don't shrink bridge resources")). Prior to
dff22d2054b5, ARM didn't read bridge windows at all, so the "original size"
was zero, and we assigned a 3MB window.

After dff22d2054b5, we read the bridge windows before sizing the bus. The
firmware programmed a 16MB window (size 0x01000000) in 00:00.0, and since
we never decrease the size, we kept 16MB even though we only needed 3MB.
But 16MB doesn't fit in the host bridge aperture, so we failed to assign
space for the window and the downstream devices.

I think this is a defect in the PCI core: we shouldn't rely on the firmware
to assign sensible windows.

Ray reported a similar problem, also on ARM, with Broadcom iProc.

Issues like this are too hard to fix right now, so revert dff22d2054b5.

Reported-by: Hannes
Reported-by: Ray Jui
Link: http://lkml.kernel.org/r/CAAa04yFQEUJm7Jj1qMT57-LG7ZGtnhNDBe=PpSRa70Mj+XhW-A@mail.gmail.com
Link: http://lkml.kernel.org/r/55F75BB8.4070405@broadcom.com
Signed-off-by: Bjorn Helgaas
Acked-by: Yinghai Lu
Acked-by: Lorenzo Pieralisi

Merge tag 'powerpc-4.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2015-09-03T23:41:38+00:00

Pull powerpc updates from Michael Ellerman:

 - support "hybrid" iommu/direct DMA ops for coherent_mask < dma_mask
   from Benjamin Herrenschmidt

 - EEH fixes for SRIOV from Gavin

 - introduce rtas_get_sensor_fast() for IRQ handlers from Thomas Huth

 - use hardware RNG for arch_get_random_seed_* not arch_get_random_*
   from Paul Mackerras

 - seccomp filter support from Michael Ellerman

 - opal_cec_reboot2() handling for HMIs & machine checks from Mahesh
   Salgaonkar

 - add powerpc timebase as a trace clock source from Naveen N.  Rao

 - misc cleanups in the xmon, signal & SLB code from Anshuman Khandual

 - add an inline function to update POWER8 HID0 from Gautham R.  Shenoy

 - fix pte_pagesize_index() crash on 4K w/64K hash from Michael Ellerman

 - drop support for 64K local store on 4K kernels from Michael Ellerman

 - move dma_get_required_mask() from pnv_phb to pci_controller_ops from
   Andrew Donnellan

 - initialize distance lookup table from drconf path from Nikunj A
   Dadhania

 - enable RTC class support from Vaibhav Jain

 - disable automatically blocked PCI config from Gavin Shan

 - add LEDs driver for PowerNV platform from Vasant Hegde

 - fix endianness issues in the HVSI driver from Laurent Dufour

 - kexec endian fixes from Samuel Mendoza-Jonas

 - fix corrupted pdn list from Gavin Shan

 - fix fenced PHB caused by eeh_slot_error_detail() from Gavin Shan

 - Freescale updates from Scott: Highlights include 32-bit memcpy/memset
   optimizations, checksum optimizations, 85xx config fragments and
   updates, device tree updates, e6500 fixes for non-SMP, and misc
   cleanup and minor fixes.

 - a ton of cxl updates & fixes:
    - add explicit precision specifiers from Rasmus Villemoes
    - use more common format specifier from Rasmus Villemoes
    - destroy cxl_adapter_idr on module_exit from Johannes Thumshirn
    - destroy afu->contexts_idr on release of an afu from Johannes
      Thumshirn
    - compile with -Werror from Daniel Axtens
    - EEH support from Daniel Axtens
    - plug irq_bitmap getting leaked in cxl_context from Vaibhav Jain
    - add alternate MMIO error handling from Ian Munsie
    - allow release of contexts which have been OPENED but not STARTED
      from Andrew Donnellan
    - remove use of macro DEFINE_PCI_DEVICE_TABLE from Vaishali Thakkar
    - release irqs if memory allocation fails from Vaibhav Jain
    - remove racy attempt to force EEH invocation in reset from Daniel
      Axtens
    - fix + cleanup error paths in cxl_dev_context_init from Ian Munsie
    - fix force unmapping mmaps of contexts allocated through the kernel
      api from Ian Munsie
    - set up and enable PSL Timebase from Philippe Bergheaud

* tag 'powerpc-4.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (140 commits)
  cxl: Set up and enable PSL Timebase
  cxl: Fix force unmapping mmaps of contexts allocated through the kernel api
  cxl: Fix + cleanup error paths in cxl_dev_context_init
  powerpc/eeh: Fix fenced PHB caused by eeh_slot_error_detail()
  powerpc/pseries: Cleanup on pci_dn_reconfig_notifier()
  powerpc/pseries: Fix corrupted pdn list
  powerpc/powernv: Enable LEDS support
  powerpc/iommu: Set default DMA offset in dma_dev_setup
  cxl: Remove racy attempt to force EEH invocation in reset
  cxl: Release irqs if memory allocation fails
  cxl: Remove use of macro DEFINE_PCI_DEVICE_TABLE
  powerpc/powernv: Fix mis-merge of OPAL support for LEDS driver
  powerpc/powernv: Reset HILE before kexec_sequence()
  powerpc/kexec: Reset secondary cpu endianness before kexec
  powerpc/hvsi: Fix endianness issues in the HVSI driver
  leds/powernv: Add driver for PowerNV platform
  powerpc/powernv: Create LED platform device
  powerpc/powernv: Add OPAL interfaces for accessing and modifying system LED states
  powerpc/powernv: Fix the log message when disabling VF
  cxl: Allow release of contexts which have been OPENED but not STARTED
  ...

powerpc: pci: use %pR for printing struct resource

2015-08-06T05:10:19+00:00

Use %pR to simplify the debug code. This also make the debug info more
readable.

Signed-off-by: Kevin Hao 
[mpe: Unsplit multi-line printk strings]
Signed-off-by: Michael Ellerman

PCI: Call pci_read_bridge_bases() from core instead of arch code

2015-07-23T15:13:29+00:00

When we scan a PCI bus, we read PCI-PCI bridge window registers with
pci_read_bridge_bases() so we can validate the resource hierarchy.  Most
architectures call pci_read_bridge_bases() from pcibios_fixup_bus(), but
PCI-PCI bridges are not arch-specific, so this doesn't need to be in
arch-specific code.

Call pci_read_bridge_bases() directly from the PCI core instead of from
arch code.

For alpha and mips, we now call pci_read_bridge_bases() always; previously
we only called it if PCI_PROBE_ONLY was set.

[bhelgaas: changelog]
Signed-off-by: Lorenzo Pieralisi 
Signed-off-by: Bjorn Helgaas 
CC: Ralf Baechle 
CC: James E.J. Bottomley 
CC: Michael Ellerman 
CC: Bjorn Helgaas 
CC: Richard Henderson 
CC: Benjamin Herrenschmidt 
CC: David Howells 
CC: Russell King 
CC: Tony Luck 
CC: David S. Miller 
CC: Ingo Molnar 
CC: Guenter Roeck 
CC: Michal Simek 
CC: Chris Zankel

powerpc/pci: Add pcibios_disable_device() hook

2015-06-03T03:27:16+00:00

This adds a hook into the powerpc pci code for pci_disable_device() calls.  The
generic code already provides a weak pcibios_disable_device() symbol, so we
just need to provide our own in powerpc and it'll get picked up.

This is passed directly to the phb controller ops, provided one exists.

Signed-off-by: Michael Neuling 
Signed-off-by: Michael Ellerman

powerpc/pci: Export symbols for CXL

2015-06-03T03:27:15+00:00

Export pcibios_claim_one_bus, pcibios_scan_phb and pcibios_alloc_controller.

These will be used by the CXL driver.

Signed-off-by: Daniel Axtens 
Signed-off-by: Michael Ellerman

Merge branch 'next-sriov' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc into next

2015-04-13T23:29:23+00:00

Merge Richard's work to support SR-IOV on PowerNV. All generic PCI
patches acked by Bjorn.

Some minor conflicts with Daniel's pci_controller_ops work.

Conflicts:
	arch/powerpc/include/asm/machdep.h
	arch/powerpc/platforms/powernv/pci-ioda.c

powerpc: Remove shims for pci_controller_ops operations

2015-04-11T10:49:18+00:00

Remove shims, patch callsites to use pci_controller_ops
versions instead.

Also move back the probe mode defines, as explained in the patch
for pci_probe_mode.

Signed-off-by: Daniel Axtens 
Signed-off-by: Michael Ellerman

powerpc: Create pci_controller_ops.reset_secondary_bus and shim

2015-04-11T10:49:14+00:00

Add pci_controller_ops.reset_secondary_bus,
shadowing ppc_md.pcibios_reset_secondary_bus.
Add a shim, and changes the callsites to use the shim.

Use pcibios_reset_secondary_bus_shim, as both
pcibios_reset_secondary_bus and pci_reset_secondary_bus
are already taken.

Signed-off-by: Daniel Axtens 
Signed-off-by: Michael Ellerman