user/sven/linux.git/Documentation/powerpc, branch v3.16.67

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

2014-06-11T01:54:22Z

Pull powerpc updates from Ben Herrenschmidt: "Here is the bulk of the powerpc changes for this merge window. It got a bit delayed in part because I wasn't paying attention, and in part because I discovered I had a core PCI change without a PCI maintainer ack in it. Bjorn eventually agreed it was ok to merge it though we'll probably improve it later and I didn't want to rebase to add his ack. There is going to be a bit more next week, essentially fixes that I still want to sort through and test. The biggest item this time is the support to build the ppc64 LE kernel with our new v2 ABI. We previously supported v2 userspace but the kernel itself was a tougher nut to crack. This is now sorted mostly thanks to Anton and Rusty. We also have a fairly big series from Cedric that add support for 64-bit LE zImage boot wrapper. This was made harder by the fact that traditionally our zImage wrapper was always 32-bit, but our new LE toolchains don't really support 32-bit anymore (it's somewhat there but not really "supported") so we didn't want to rely on it. This meant more churn that just endian fixes. This brings some more LE bits as well, such as the ability to run in LE mode without a hypervisor (ie. under OPAL firmware) by doing the right OPAL call to reinitialize the CPU to take HV interrupts in the right mode and the usual pile of endian fixes. There's another series from Gavin adding EEH improvements (one day we *will* have a release with less than 20 EEH patches, I promise!). Another highlight is the support for the "Split core" functionality on P8 by Michael. This allows a P8 core to be split into "sub cores" of 4 threads which allows the subcores to run different guests under KVM (the HW still doesn't support a partition per thread). And then the usual misc bits and fixes ..." [ Further delayed by gmail deciding that BenH is a dirty spammer. Google knows. ] * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (155 commits) powerpc/powernv: Add missing include to LPC code selftests/powerpc: Test the THP bug we fixed in the previous commit powerpc/mm: Check paca psize is up to date for huge mappings powerpc/powernv: Pass buffer size to OPAL validate flash call powerpc/pseries: hcall functions are exported to modules, need _GLOBAL_TOC() powerpc: Exported functions __clear_user and copy_page use r2 so need _GLOBAL_TOC() powerpc/powernv: Set memory_block_size_bytes to 256MB powerpc: Allow ppc_md platform hook to override memory_block_size_bytes powerpc/powernv: Fix endian issues in memory error handling code powerpc/eeh: Skip eeh sysfs when eeh is disabled powerpc: 64bit sendfile is capped at 2GB powerpc/powernv: Provide debugfs access to the LPC bus via OPAL powerpc/serial: Use saner flags when creating legacy ports powerpc: Add cpu family documentation powerpc/xmon: Fix up xmon format strings powerpc/powernv: Add calls to support little endian host powerpc: Document sysfs DSCR interface powerpc: Fix regression of per-CPU DSCR setting powerpc: Split __SYSFS_SPRSETUP macro arch: powerpc/fadump: Cleaning up inconsistent NULL checks ...

powerpc: Add cpu family documentation

2014-06-05T03:20:01Z

This patch adds some documentation on the different cpu families supported by arch/powerpc. Signed-off-by: Michael Ellerman Signed-off-by: Benjamin Herrenschmidt

doc: spelling error changes

2014-05-05T13:32:05Z

Fixed multiple spelling errors. Acked-by: Randy Dunlap Signed-off-by: Carlos E. Garcia Signed-off-by: Jiri Kosina

powerpc: Update the 00-Index in Documentation/powerpc

2013-08-27T04:44:27Z

People have been dropping things in here without updating the index, do it for them. Signed-off-by: Michael Ellerman Signed-off-by: Benjamin Herrenschmidt

powerpc/perf: Core EBB support for 64-bit book3s

2013-07-01T01:50:10Z

Add support for EBB (Event Based Branches) on 64-bit book3s. See the included documentation for more details. EBBs are a feature which allows the hardware to branch directly to a specified user space address when a PMU event overflows. This can be used by programs for self-monitoring with no kernel involvement in the inner loop. Most of the logic is in the generic book3s code, primarily to avoid a proliferation of PMU callbacks. Signed-off-by: Michael Ellerman Signed-off-by: Benjamin Herrenschmidt

powerpc/tm: Fix userspace stack corruption on signal delivery for active transactions

2013-05-31T22:29:23Z

When in an active transaction that takes a signal, we need to be careful with the stack. It's possible that the stack has moved back up after the tbegin. The obvious case here is when the tbegin is called inside a function that returns before a tend. In this case, the stack is part of the checkpointed transactional memory state. If we write over this non transactionally or in suspend, we are in trouble because if we get a tm abort, the program counter and stack pointer will be back at the tbegin but our in memory stack won't be valid anymore. To avoid this, when taking a signal in an active transaction, we need to use the stack pointer from the checkpointed state, rather than the speculated state. This ensures that the signal context (written tm suspended) will be written below the stack required for the rollback. The transaction is aborted becuase of the treclaim, so any memory written between the tbegin and the signal will be rolled back anyway. For signals taken in non-TM or suspended mode, we use the normal/non-checkpointed stack pointer. Tested with 64 and 32 bit signals Signed-off-by: Michael Neuling Cc: # v3.9 Signed-off-by: Benjamin Herrenschmidt

powerpc/tm: Abort on emulation and alignment faults

2013-05-31T22:29:22Z

If we are emulating an instruction inside an active user transaction that touches memory, the kernel can't emulate it as it operates in transactional suspend context. We need to abort these transactions and send them back to userspace for the hardware to rollback. We can service these if the user transaction is in suspend mode, since the kernel will operate in the same suspend context. This adds a check to all alignment faults and to specific instruction emulations (only string instructions for now). If the user process is in an active (non-suspended) transaction, we abort the transaction go back to userspace allowing the HW to roll back the transaction and tell the user of the failure. This also adds new tm abort cause codes to report the reason of the persistent error to the user. Crappy test case here http://neuling.org/devel/junkcode/aligntm.c Signed-off-by: Michael Neuling Cc: # v3.9 Signed-off-by: Benjamin Herrenschmidt

powerpc/tm: Update cause codes documentation

2013-05-31T22:29:22Z

Signed-off-by: Michael Neuling Cc: # 3.9 only Signed-off-by: Benjamin Herrenschmidt

powerpc/ptrace: Add DAWR debug feature info for userspace

2013-04-18T05:59:55Z

This adds new debug feature information so that the DAWR can be identified by userspace tools like GDB. Unfortunately the DAWR doesn't sit nicely into the current description that ptrace provides to userspace via struct ppc_debug_info. It doesn't allow for specifying that only some ranges are possible or even the end alignment constraints (DAWR only allows 512 byte wide ranges which can't cross a 512 byte boundary). After talking to Edjunior Machado (GDB ppc developer), it was decided this was the best approach. Just mark it as debug feature DAWR and tools like GDB can internally decide the constraints. Signed-off-by: Michael Neuling Signed-off-by: Michael Ellerman

powerpc: remove PReP platform

2013-04-18T03:03:53Z

PPC_PREP is marked as BROKEN since v2.6.15. Remove all PReP specific code now. Signed-off-by: Paul Bolle Signed-off-by: Michael Ellerman