linux-toradex.git/arch/powerpc/kernel, branch v3.2.71

powerpc: Don't skip ePAPR spin-table CPUs

2015-08-06T23:32:16+00:00

commit 6663a4fa6711050036562ddfd2086edf735fae21 upstream.

Commit 59a53afe70fd530040bdc69581f03d880157f15a "powerpc: Don't setup
CPUs with bad status" broke ePAPR SMP booting.  ePAPR says that CPUs
that aren't presently running shall have status of disabled, with
enable-method being used to determine whether the CPU can be enabled.

Fix by checking for spin-table, which is currently the only supported
enable-method.

Signed-off-by: Scott Wood 
Cc: Michael Neuling 
Cc: Emil Medve 
Signed-off-by: Benjamin Herrenschmidt 
Signed-off-by: Ben Hutchings 
Cc: Jonathan Toppins

powerpc: Make logical to real cpu mapping code endian safe

2015-08-06T23:32:16+00:00

commit ac13282dff13cd0f4da0f0ccb134bc29bfa10255 upstream.

Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt 
[jt: fixed up context due to commit 59a53afe70fd530040bdc69581f03d880157f15a
     already being backported.]
Signed-off-by: Jonathan Toppins 
Reviewed-by: Andy Gospodarek 
Acked-by: Curt Brune 
Acked-by: Roopa Prabhu 
Signed-off-by: Ben Hutchings

powerpc: Align TOC to 256 bytes

2015-08-06T23:32:11+00:00

commit 5e95235ccd5442d4a4fe11ec4eb99ba1b7959368 upstream.

Recent toolchains force the TOC to be 256 byte aligned. We need
to enforce this alignment in our linker script, otherwise pointers
to our TOC variables (__toc_start, __prom_init_toc_start) could
be incorrect.

If they are bad, we die a few hundred instructions into boot.

Signed-off-by: Anton Blanchard 
Signed-off-by: Michael Ellerman 
Signed-off-by: Ben Hutchings

powerpc/perf: Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH

2015-08-06T23:32:04+00:00

commit 9a5cbce421a283e6aea3c4007f141735bf9da8c3 upstream.

We cap 32bit userspace backtraces to PERF_MAX_STACK_DEPTH
(currently 127), but we forgot to do the same for 64bit backtraces.

Signed-off-by: Anton Blanchard 
Signed-off-by: Michael Ellerman 
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings

powerpc: Fix missing L2 cache size in /sys/devices/system/cpu

2015-08-06T23:32:03+00:00

commit f7e9e358362557c3aa2c1ec47490f29fe880a09e upstream.

This problem appears to have been introduced in 2.6.29 by commit
93197a36a9c1 "Rewrite sysfs processor cache info code".

This caused lscpu to error out on at least e500v2 devices, eg:

  error: cannot open /sys/devices/system/cpu/cpu0/cache/index2/size: No such file or directory

Some embedded powerpc systems use cache-size in DTS for the unified L2
cache size, not d-cache-size, so we need to allow for both DTS names.
Added a new CACHE_TYPE_UNIFIED_D cache_type_info structure to handle
this.

Fixes: 93197a36a9c1 ("powerpc: Rewrite sysfs processor cache info code")
Signed-off-by: Dave Olson 
Signed-off-by: Michael Ellerman 
[bwh: Backported to 3.2:
 - Adjust context
 - Preserve __cpuinit attribute on cache_do_one_devnode_unified()]
Signed-off-by: Ben Hutchings

powerpc: Fix build errors STRICT_MM_TYPECHECKS

2014-09-13T22:41:44+00:00

commit 83d5e64b7efa7f39b10ff5e92792e807a720289c upstream.

Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Benjamin Herrenschmidt 
Signed-off-by: Ben Hutchings

powerpc: Don't setup CPUs with bad status

2014-07-11T12:33:49+00:00

commit 59a53afe70fd530040bdc69581f03d880157f15a upstream.

OPAL will mark a CPU that is guarded as "bad" in the status property of the CPU
node.

Unfortunatley Linux doesn't check this property and will put the bad CPU in the
present map.  This has caused hangs on booting when we try to unsplit the core.

This patch checks the CPU is avaliable via this status property before putting
it in the present map.

Signed-off-by: Michael Neuling 
Tested-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt 
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings

powerpc/serial: Use saner flags when creating legacy ports

2014-07-11T12:33:46+00:00

commit c4cad90f9e9dcb85afc5e75a02ae3522ed077296 upstream.

We had a mix & match of flags used when creating legacy ports
depending on where we found them in the device-tree. Among others
we were missing UPF_SKIP_TEST for some kind of ISA ports which is
a problem as quite a few UARTs out there don't support the loopback
test (such as a lot of BMCs).

Let's pick the set of flags used by the SoC code and generalize it
which means autoconf, no loopback test, irq maybe shared and fixed
port.

Sending to stable as the lack of UPF_SKIP_TEST is breaking
serial on some machines so I want this back into distros

Signed-off-by: Benjamin Herrenschmidt 
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings

powerpc: Align p_dyn, p_rela and p_st symbols

2014-04-01T23:58:58+00:00

commit a5b2cf5b1af424ee3dd9e3ce6d5cea18cb927e67 upstream.

The 64bit relocation code places a few symbols in the text segment.
These symbols are only 4 byte aligned where they need to be 8 byte
aligned. Add an explicit alignment.

Signed-off-by: Anton Blanchard 
Tested-by: Laurent Dufour 
Signed-off-by: Benjamin Herrenschmidt 
Signed-off-by: Ben Hutchings

powerpc/crashdump : Fix page frame number check in copy_oldmem_page

2014-04-01T23:58:57+00:00

commit f5295bd8ea8a65dc5eac608b151386314cb978f1 upstream.

In copy_oldmem_page, the current check using max_pfn and min_low_pfn to
decide if the page is backed or not, is not valid when the memory layout is
not continuous.

This happens when running as a QEMU/KVM guest, where RTAS is mapped higher
in the memory. In that case max_pfn points to the end of RTAS, and a hole
between the end of the kdump kernel and RTAS is not backed by PTEs. As a
consequence, the kdump kernel is crashing in copy_oldmem_page when accessing
in a direct way the pages in that hole.

This fix relies on the memblock's service memblock_is_region_memory to
check if the read page is part or not of the directly accessible memory.

Signed-off-by: Laurent Dufour 
Tested-by: Mahesh Salgaonkar 
Signed-off-by: Benjamin Herrenschmidt 
Signed-off-by: Ben Hutchings