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  1. 14 6月, 2016 2 次提交
  3. 06 6月, 2016 1 次提交
  5. 30 5月, 2016 2 次提交
  7. 12 5月, 2016 1 次提交
    • G
      powerpc/iommu: Remove the dependency on EEH struct in DDW mechanism · 8445a87f
      由 Guilherme G. Piccoli 提交于 
      Commit 39baadbf ("powerpc/eeh: Remove eeh information from pci_dn")
changed the pci_dn struct by removing its EEH-related members.
As part of this clean-up, DDW mechanism was modified to read the device
configuration address from eeh_dev struct.

As a consequence, now if we disable EEH mechanism on kernel command-line
for example, the DDW mechanism will fail, generating a kernel oops by
dereferencing a NULL pointer (which turns to be the eeh_dev pointer).

This patch just changes the configuration address calculation on DDW
functions to a manual calculation based on pci_dn members instead of
using eeh_dev-based address.

No functional changes were made. This was tested on pSeries, both
in PHyp and qemu guest.

Fixes: 39baadbf ("powerpc/eeh: Remove eeh information from pci_dn")
Cc: stable@vger.kernel.org # v3.4+
Reviewed-by: NGavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: NGuilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      8445a87f
  9. 11 5月, 2016 7 次提交
  11. 01 5月, 2016 2 次提交
    • A
      powerpc/mm/hash: Add support for Power9 Hash · 50de596d
      由 Aneesh Kumar K.V 提交于 
      PowerISA 3.0 adds a parition table indexed by LPID. Parition table
allows us to specify the MMU model that will be used for guest and host
translation.

This patch adds support with SLB based hash model (UPRT = 0). What is
required with this model is to support the new hash page table entry
format and also setup partition table such that we use hash table for
address translation.

We don't have segment table support yet.

In order to make sure we don't load KVM module on Power9 (since we don't
have kvm support yet) this patch also disables KVM on Power9.
Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      50de596d
    • A
      powerpc/mm: Drop WIMG in favour of new constants · 30bda41a
      由 Aneesh Kumar K.V 提交于 
      PowerISA 3.0 introduces two pte bits with the below meaning for radix:
  00 -> Normal Memory
  01 -> Strong Access Order (SAO)
  10 -> Non idempotent I/O (Cache inhibited and guarded)
  11 -> Tolerant I/O (Cache inhibited)

We drop the existing WIMG bits in the Linux page table in favour of the
above constants. We loose _PAGE_WRITETHRU with this conversion. We only
use writethru via pgprot_cached_wthru() which is used by
fbdev/controlfb.c which is Apple control display and also PPC32.

With respect to _PAGE_COHERENCE, we have been marking hpte always
coherent for some time now. htab_convert_pte_flags() always added
HPTE_R_M.

NOTE: KVM changes need closer review.
Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      30bda41a
  13. 11 4月, 2016 2 次提交
    • N
      powerpc/pseries: Update LMB associativity index during DLPAR add/remove · bdf5fc63
      由 Nathan Fontenot 提交于 
      The associativity array index specified for a LMB in the device tree,
/ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory, needs to be updated
prior to DLPAR adding a LMB and after DLPAR removing a LMB.

Without doing this step in the DLPAR add process a LMB could be configured
with the incorrect affinity. For a LMB that was not present at boot the
affinity index is set to 0xffffffff, which defaults to adding the LMB to
the first online node since the index is not a valid value. Or, the
affinity index could contain a stale value if the LMB was present at boot
but later DLPAR removed and is being DLPAR added back to the system.

This patch adds a step in the DLPAR add flow to look up the associativity
index for a LMB prior to adding a LMB and setting the associativity to
0xffffffff when a LMB is removed.

This patch also modifies the DLPAR add/remove flow to no longer do a single
update of the device tree property after all of the requested DLPAR
operations are complete and now does a property update during the add
or remove of each LMB.
Signed-off-by: NNathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      bdf5fc63
    • N
      powerpc/pseries: Refactor dlpar_add_lmb() code · 4a4bdfea
      由 Nathan Fontenot 提交于 
      Re-factor dlpar_lmb_add() routine by moving the validation of the lmb
flags and the acquireing of the DRC to a wrapper around the work to add
the memory to the system. This is done to make handling of errors
during the addition of the memory easier and to facilitate the upcoming
addition of updating the lmb's affinity prior to adding the memory.
Signed-off-by: NNathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      4a4bdfea
  15. 18 3月, 2016 1 次提交
  17. 01 3月, 2016 2 次提交
    • D
      powerpc/mm: Handle removing maybe-present bolted HPTEs · 27828f98
      由 David Gibson 提交于 
      At the moment the hpte_removebolted callback in ppc_md returns void and
will BUG_ON() if the hpte it's asked to remove doesn't exist in the first
place.  This is awkward for the case of cleaning up a mapping which was
partially made before failing.

So, we add a return value to hpte_removebolted, and have it return ENOENT
in the case that the HPTE to remove didn't exist in the first place.

In the (sole) caller, we propagate errors in hpte_removebolted to its
caller to handle.  However, we handle ENOENT specially, continuing to
complete the unmapping over the specified range before returning the error
to the caller.

This means that htab_remove_mapping() will work sanely on a partially
present mapping, removing any HPTEs which are present, while also returning
ENOENT to its caller in case it's important there.

There are two callers of htab_remove_mapping():
   - In remove_section_mapping() we already WARN_ON() any error return,
     which is reasonable - in this case the mapping should be fully
     present
   - In vmemmap_remove_mapping() we BUG_ON() any error.  We change that to
     just a WARN_ON() in the case of ENOENT, since failing to remove a
     mapping that wasn't there in the first place probably shouldn't be
     fatal.
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
Reviewed-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      27828f98
    • A
      powerpc: Fix misspellings in comments. · 446957ba
      由 Adam Buchbinder 提交于 
      Signed-off-by: NAdam Buchbinder <adam.buchbinder@gmail.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      446957ba
  19. 17 12月, 2015 8 次提交
  21. 14 12月, 2015 3 次提交
  23. 28 10月, 2015 1 次提交
    • N
      powerpc/pseries: Correct string length in pseries_of_derive_parent() · f755ecfb
      由 Nathan Fontenot 提交于 
      Commit a030e1e4 make a change to use
kstrndup() instead of kmalloc() + strlcpy() in the pseries_of_derive_parent()
routine that introduces a subtle change in the parent path name generated.
The kstrndup() routine will copy n characters followed by a terminating null,
whereas strlcpy() will copy n-1 characters and add a terminating null.

This slight difference results in having a parent path that includes the
tailing '/' character, "/cpus/" vs. "/cpus". This then causes the subsequent
call to of_find_node_by_path() to fail, and in the case of DLPAR add
operations the DLPAR request fails.

This patch decrements the pointer returned from kbasename() to point to the
'/' character before the base name instead of the base name. This then
adjusts the string length calculations to not include the trailing '/'
in the parent path name.
Signed-off-by: NNathan Fontenot <nfont@linux.vnet.ibm.com>
Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      f755ecfb
  25. 21 10月, 2015 1 次提交
  27. 15 10月, 2015 4 次提交
  29. 09 10月, 2015 1 次提交
  31. 05 10月, 2015 2 次提交