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  1. 04 6月, 2015 2 次提交
  3. 03 6月, 2015 27 次提交
  5. 02 6月, 2015 11 次提交
    • M
      selftests/powerpc: Add install support to more powerpc tests · 989898b7
      由 Michael Ellerman 提交于 
      These tests were merged in parallel to the install support, update them
now to use it.

This also adds cross compile support for the VPHN test which was missing
it.
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      989898b7
    • C
      powerpc/configs: Replace pseries_le_defconfig with a Makefile target using merge_config · ea4d1a87
      由 Cyril Bur 提交于 
      Rather than continuing to maintain a copy of pseries_defconfig with
CONFIG_CPU_LITTLE_ENDIAN enabled, use the generic merge_config script
and use an le.config to enable little endian on top of pseries_defconfig
without the need for a duplicated _defconfig file.

This method will require less maintenance in the future and will ensure
that both 'defconfigs' are always in sync.

It is worth noting that the seemingly more simple approach of:

  pseries_le_defconfig: pseries_defconfig
  	$(Q)$(MAKE) le.config

Will not work when building using O=builddir.

The obvious fix to that:

  pseries_le_defconfig:
  	$(Q)$(MAKE) -f $(srctree)/Makefile pseries_defconfig le.config

Also does not work. This is because if we have for example:

config FOO
	depends on CPU_BIG_ENDIAN
	select BAR

Then BAR will be enabled by the first call to kconfig (via
pseries_defconfig), and then will remain enabled after we merge
le.config, even though FOO will have been turned off.

The solution is to ensure to only invoke the kconfig logic once, after
we have merged all the config fragments. This ensures nothing is
select'ed on that should then be disabled by the later merged configs.
This is done through the explicit call to make olddefconfig
Signed-off-by: NCyril Bur <cyrilbur@gmail.com>
Reviewed-by: NSamuel Mendoza-Jonas <sam.mj@au1.ibm.com>
[mpe: Massage change log, fix white space and use ARCH not SRCARCH]
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      ea4d1a87
    • C
      powerpc/configs: Merge pseries_defconfig and pseries_le_defconfig · a1c97df2
      由 Cyril Bur 提交于 
      These two configs should be identical with the exception of big or little
endian.

The big endian version has XMON_DEFAULT turned on while the little endian
has XMON_DEFAULT not set. It makes the most sense for defconfigs not to use
xmon by default, production systems should get back up as quickly as
possible, not sit in xmon.

In the event debugging is required, the option can be enabled or xmon=on
can be specified on commandline.
Signed-off-by: NCyril Bur <cyrilbur@gmail.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      a1c97df2
    • J
      powerpc: Use irq_desc_get_xxx() to avoid redundant lookup of irq_desc · c1231a78
      由 Jiang Liu 提交于 
      Use irq_desc_get_xxx() to avoid redundant lookup of irq_desc while we
already have a pointer to corresponding irq_desc.
Signed-off-by: NJiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      c1231a78
    • A
      powerpc: Non relocatable system call doesn't need a trampoline · d20be433
      由 Anton Blanchard 提交于 
      We need to use a trampoline when using LOAD_HANDLER(), because the
destination needs to be in the first 64kB. An absolute branch has
no such limitations, so just jump there.
Signed-off-by: NAnton Blanchard <anton@samba.org>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      d20be433
    • A
      powerpc: Relocatable system call no longer uses the LR · 05b05f28
      由 Anton Blanchard 提交于 
      We had some code to restore the LR in the relocatable system call path
back when we used the LR to do an indirect branch.

Commit 6a404806 ("powerpc: Avoid link stack corruption in MMU
on syscall entry path") changed this to use the CTR which is volatile
across system calls so does not need restoring.

Remove the stale comment and the restore of the LR.
Signed-off-by: NAnton Blanchard <anton@samba.org>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      05b05f28
    • A
      powerpc/perf: Fix book3s kernel to userspace backtraces · 72e349f1
      由 Anton Blanchard 提交于 
      When we take a PMU exception or a software event we call
perf_read_regs(). This overloads regs->result with a boolean that
describes if we should use the sampled instruction address register
(SIAR) or the regs.

If the exception is in kernel, we start with the kernel regs and
backtrace through the kernel stack. At this point we switch to the
userspace regs and backtrace the user stack with perf_callchain_user().

Unfortunately these regs have not got the perf_read_regs() treatment,
so regs->result could be anything. If it is non zero,
perf_instruction_pointer() decides to use the SIAR, and we get issues
like this:

0.11%  qemu-system-ppc  [kernel.kallsyms]        [k] _raw_spin_lock_irqsave
       |
       ---_raw_spin_lock_irqsave
          |
          |--52.35%-- 0
          |          |
          |          |--46.39%-- __hrtimer_start_range_ns
          |          |          kvmppc_run_core
          |          |          kvmppc_vcpu_run_hv
          |          |          kvmppc_vcpu_run
          |          |          kvm_arch_vcpu_ioctl_run
          |          |          kvm_vcpu_ioctl
          |          |          do_vfs_ioctl
          |          |          sys_ioctl
          |          |          system_call
          |          |          |
          |          |          |--67.08%-- _raw_spin_lock_irqsave <--- hi mum
          |          |          |          |
          |          |          |           --100.00%-- 0x7e714
          |          |          |                     0x7e714

Notice the bogus _raw_spin_irqsave when we transition from kernel
(system_call) to userspace (0x7e714). We inserted what was in the SIAR.

Add a check in regs_use_siar() to check that the regs in question
are from a PMU exception. With this fix the backtrace makes sense:

     0.47%  qemu-system-ppc  [kernel.vmlinux]         [k] _raw_spin_lock_irqsave
            |
            ---_raw_spin_lock_irqsave
               |
               |--53.83%-- 0
               |          |
               |          |--44.73%-- hrtimer_try_to_cancel
               |          |          kvmppc_start_thread
               |          |          kvmppc_run_core
               |          |          kvmppc_vcpu_run_hv
               |          |          kvmppc_vcpu_run
               |          |          kvm_arch_vcpu_ioctl_run
               |          |          kvm_vcpu_ioctl
               |          |          do_vfs_ioctl
               |          |          sys_ioctl
               |          |          system_call
               |          |          __ioctl
               |          |          0x7e714
               |          |          0x7e714

Cc: stable@vger.kernel.org
Signed-off-by: NAnton Blanchard <anton@samba.org>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      72e349f1
    • M
      powerpc/mm: Fix build break with STRICT_MM_TYPECHECKS && DEBUG_PAGEALLOC · 09f3f326
      由 Michael Ellerman 提交于 
      If both STRICT_MM_TYPECHECKS and DEBUG_PAGEALLOC are enabled, the code
in kernel_map_linear_page() is built, and so we fail with:

  arch/powerpc/mm/hash_utils_64.c:1478:2:
  error: incompatible type for argument 1 of 'htab_convert_pte_flags'

Fix it by using pgprot_val().
Reported-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      09f3f326
    • D
      powerpc/powernv: Move dma_set_mask() from pnv_phb to pci_controller_ops · 763d2d8d
      由 Daniel Axtens 提交于 
      Previously, dma_set_mask() on powernv was convoluted:
 0) Call dma_set_mask() (a/p/kernel/dma.c)
 1) In dma_set_mask(), ppc_md.dma_set_mask() exists, so call it.
 2) On powernv, that function pointer is pnv_dma_set_mask().
    In pnv_dma_set_mask(), the device is pci, so call pnv_pci_dma_set_mask().
 3) In pnv_pci_dma_set_mask(), call pnv_phb->set_dma_mask() if it exists.
 4) It only exists in the ioda case, where it points to
    pnv_pci_ioda_dma_set_mask(), which is the final function.

So the call chain is:
 dma_set_mask() ->
  pnv_dma_set_mask() ->
   pnv_pci_dma_set_mask() ->
    pnv_pci_ioda_dma_set_mask()

Both ppc_md and pnv_phb function pointers are used.

Rip out the ppc_md call, pnv_dma_set_mask() and pnv_pci_dma_set_mask().

Instead:
 0) Call dma_set_mask() (a/p/kernel/dma.c)
 1) In dma_set_mask(), the device is pci, and pci_controller_ops.dma_set_mask()
    exists, so call pci_controller_ops.dma_set_mask()
 2) In the ioda case, that points to pnv_pci_ioda_dma_set_mask().

The new call chain is
 dma_set_mask() ->
  pnv_pci_ioda_dma_set_mask()

Now only the pci_controller_ops function pointer is used.

The fallback paths for p5ioc2 are the same.

Previously, pnv_pci_dma_set_mask() would find no pnv_phb->set_dma_mask()
function, to it would call __set_dma_mask().

Now, dma_set_mask() finds no ppc_md call or pci_controller_ops call,
so it calls __set_dma_mask().
Signed-off-by: NDaniel Axtens <dja@axtens.net>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      763d2d8d
    • D
      powerpc/pci: add dma_set_mask to pci_controller_ops · 3405c257
      由 Daniel Axtens 提交于 
      Some systems only need to deal with DMA masks for PCI devices.
For these systems, we can avoid the need for a platform hook and
instead use a pci controller based hook.
Signed-off-by: NDaniel Axtens <dja@axtens.net>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      3405c257
    • D
      powerpc/powernv: Specialise pci_controller_ops for each controller type · 92ae0353
      由 Daniel Axtens 提交于 
      Remove powernv generic PCI controller operations. Replace it with
controller ops for each of the two supported PHBs.

As an added bonus, make the two new structs const, which will help
guard against bugs such as the one introduced in 65ebf4b6
("powerpc/powernv: Move controller ops from ppc_md to controller_ops")
Signed-off-by: NDaniel Axtens <dja@axtens.net>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      92ae0353