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* powerpc: Restore correct DSCR in context switchAnton Blanchard2012-09-142-6/+18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | commit 714332858bfd40dcf8f741498336d93875c23aa7 upstream. During a context switch we always restore the per thread DSCR value. If we aren't doing explicit DSCR management (ie thread.dscr_inherit == 0) and the default DSCR changed while the process has been sleeping we end up with the wrong value. Check thread.dscr_inherit and select the default DSCR or per thread DSCR as required. This was found with the following test case, when running with more threads than CPUs (ie forcing context switching): http://ozlabs.org/~anton/junkcode/dscr_default_test.c With the four patches applied I can run a combination of all test cases successfully at the same time: http://ozlabs.org/~anton/junkcode/dscr_default_test.c http://ozlabs.org/~anton/junkcode/dscr_explicit_test.c http://ozlabs.org/~anton/junkcode/dscr_inherit_test.c Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* powerpc: Fix DSCR inheritance in copy_thread()Anton Blanchard2012-09-141-10/+2
| | | | | | | | | | | | | | | | | | | | | commit 1021cb268b3025573c4811f1dee4a11260c4507b upstream. If the default DSCR is non zero we set thread.dscr_inherit in copy_thread() meaning the new thread and all its children will ignore future updates to the default DSCR. This is not intended and is a change in behaviour that a number of our users have hit. We just need to inherit thread.dscr and thread.dscr_inherit from the parent which ends up being much simpler. This was found with the following test case: http://ozlabs.org/~anton/junkcode/dscr_default_test.c Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* powerpc: Fix wrong divisor in usecs_to_cputimeAndreas Schwab2012-08-091-5/+5
| | | | | | | | | | | | | | | | | | | | commit 9f5072d4f63f28d30d343573830ac6c85fc0deff upstream. Commit d57af9b (taskstats: use real microsecond granularity for CPU times) renamed msecs_to_cputime to usecs_to_cputime, but failed to update all numbers on the way. This causes nonsensical cpu idle/iowait values to be displayed in /proc/stat (the only user of usecs_to_cputime so far). This also renames __cputime_msec_factor to __cputime_usec_factor, adapting its value and using it directly in cputime_to_usecs instead of doing two multiplications. Signed-off-by: Andreas Schwab <schwab@linux-m68k.org> Acked-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Michal Hocko <mhocko@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* powerpc/ftrace: Fix assembly trampoline register usageroger blofeld2012-08-091-6/+6
| | | | | | | | | | | | | commit fd5a42980e1cf327b7240adf5e7b51ea41c23437 upstream. Just like the module loader, ftrace needs to be updated to use r12 instead of r11 with newer gcc's. Signed-off-by: Roger Blofeld <blofeldus@yahoo.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* powerpc: Fix kernel panic during kernel module loadSteffen Rumler2012-06-171-6/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | commit 3c75296562f43e6fbc6cddd3de948a7b3e4e9bcf upstream. This fixes a problem which can causes kernel oopses while loading a kernel module. According to the PowerPC EABI specification, GPR r11 is assigned the dedicated function to point to the previous stack frame. In the powerpc-specific kernel module loader, do_plt_call() (in arch/powerpc/kernel/module_32.c), GPR r11 is also used to generate trampoline code. This combination crashes the kernel, in the case where the compiler chooses to use a helper function for saving GPRs on entry, and the module loader has placed the .init.text section far away from the .text section, meaning that it has to generate a trampoline for functions in the .init.text section to call the GPR save helper. Because the trampoline trashes r11, references to the stack frame using r11 can cause an oops. The fix just uses GPR r12 instead of GPR r11 for generating the trampoline code. According to the statements from Freescale, this is safe from an EABI perspective. I've tested the fix for kernel 2.6.33 on MPC8541. Signed-off-by: Steffen Rumler <steffen.rumler.ext@nsn.com> [paulus@samba.org: reworded the description] Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* powerpc/perf: power_pmu_start restores incorrect values, breaking frequency ↵Anton Blanchard2012-02-291-1/+7
| | | | | | | | | | | | | | | | | | | | | | | | | events commit 9a45a9407c69d068500923480884661e2b9cc421 upstream. perf on POWER stopped working after commit e050e3f0a71b (perf: Fix broken interrupt rate throttling). That patch exposed a bug in the POWER perf_events code. Since the PMCs count upwards and take an exception when the top bit is set, we want to write 0x80000000 - left in power_pmu_start. We were instead programming in left which effectively disables the counter until we eventually hit 0x80000000. This could take seconds or longer. With the patch applied I get the expected number of samples: SAMPLE events: 9948 Signed-off-by: Anton Blanchard <anton@samba.org> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* powerpc/time: Handle wrapping of decrementerAnton Blanchard2012-01-122-9/+15
| | | | | | | | | | | | | | | | | | | | | | | | commit 37fb9a0231ee43d42d069863bdfd567fca2b61af upstream. When re-enabling interrupts we have code to handle edge sensitive decrementers by resetting the decrementer to 1 whenever it is negative. If interrupts were disabled long enough that the decrementer wrapped to positive we do nothing. This means interrupts can be delayed for a long time until it finally goes negative again. While we hope interrupts are never be disabled long enough for the decrementer to go positive, we have a very good test team that can drive any kernel into the ground. The softlockup data we get back from these fails could be seconds in the future, completely missing the cause of the lockup. We already keep track of the timebase of the next event so use that to work out if we should trigger a decrementer exception. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* powerpc: Copy down exception vectors after feature fixupsAnton Blanchard2011-11-213-1/+3
| | | | | | | | | | | | | | | | | commit d715e433b7ad19c02fc4becf0d5e9a59f97925de upstream. kdump fails because we try to execute an HV only instruction. Feature fixups are being applied after we copy the exception vectors down to 0 so they miss out on any updates. We have always had this issue but it only became critical in v3.0 when we added CFAR support (breaks POWER5) and v3.1 when we added POWERNV (breaks everyone). Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* powerpc: Fix device tree claim codeAnton Blanchard2011-08-151-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | commit 966728dd88b4026ec58fee169ccceaeaf56ef120 upstream. I have a box that fails in OF during boot with: DEFAULT CATCH!, exception-handler=fff00400 at %SRR0: 49424d2c4c6f6768 %SRR1: 800000004000b002 ie "IBM,Logh". OF got corrupted with a device tree string. Looking at make_room and alloc_up, we claim the first chunk (1 MB) but we never claim any more. mem_end is always set to alloc_top which is the top of our available address space, guaranteeing we will never call alloc_up and claim more memory. Also alloc_up wasn't setting alloc_bottom to the bottom of the available address space. This doesn't help the box to boot, but we at least fail with an obvious error. We could relocate the device tree in a future patch. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* powerpc/kdump: Fix timeout in crash_kexec_wait_realmodeMichael Neuling2011-08-041-5/+1
| | | | | | | | | | | | | | | | | | | commit 63f21a56f1cc0b800a4c00349c59448f82473d19 upstream. The existing code it pretty ugly. How about we clean it up even more like this? From: Anton Blanchard <anton@samba.org> We check for timeout expiry in the outer loop, but we also need to check it in the inner loop or we can lock up forever waiting for a CPU to hit real mode. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* irq_work, ppc: Fix up arch hooksPeter Zijlstra2011-08-041-1/+1
| | | | | | | | | | | | | | | | | | commit 4f8b50bbbe63ae4ec6bea28a90a9a603c745ea71 upstream. Commit e360adbe29 ("irq_work: Add generic hardirq context callbacks") fouled up the ppc bit, not properly naming the arch specific function that raises the 'self-IPI'. Cc: Huang Ying <ying.huang@intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Anton Blanchard <anton@samba.org> Cc: Eric B Munson <emunson@mgebm.net> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/n/tip-eg0aqien8p1aqvzu9dft6dtv@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* arch/powerpc: use printk_ratelimited instead of printk_ratelimitChristian Dietrich2011-06-293-46/+50
| | | | | | | | Since printk_ratelimit() shouldn't be used anymore (see comment in include/linux/printk.h), replace it with printk_ratelimited. Signed-off-by: Christian Dietrich <christian.dietrich@informatik.uni-erlangen.de> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/rtas-rtc: remove sideeffects of printk_ratelimitChristian Dietrich2011-06-291-12/+17
| | | | | | | | | | Don't use printk_ratelimit() as an additional condition for returning on an error. Because when the ratelimit is reached, printk_ratelimit will return 0 and e.g. in rtas_get_boot_time won't check for an error condition. Signed-off-by: Christian Dietrich <christian.dietrich@informatik.uni-erlangen.de> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/e500: fix breakage with fsl_rio_mcheck_exceptionScott Wood2011-06-221-1/+1
| | | | | | | | | | | | | | | | | | The wrong MCSR bit was being used on e500mc. MCSR_BUS_RBERR only exists on e500v1/v2. Use MCSR_LD on e500mc, and remove all MCSR checking in fsl_rio_mcheck_exception as we now no longer call that function if the appropriate bit in MCSR is not set. If RIO support was enabled at compile-time, but was never probed, just return from fsl_rio_mcheck_exception rather than dereference a NULL pointer. TODO: There is still a remaining, though comparitively minor, issue in that this recovery mechanism will falsely engage if there's an unrelated MCSR_LD event at the same time as a RIO error. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
* powerpc: Force page alignment for initrd reserved memoryBenjamin Herrenschmidt2011-06-091-3/+24
| | | | | | | | | | | | | | | | | | | | | | | | | When using 64K pages with a separate cpio rootfs, U-Boot will align the rootfs on a 4K page boundary. When the memory is reserved, and subsequent early memblock_alloc is called, it will allocate memory between the 64K page alignment and reserved memory. When the reserved memory is subsequently freed, it is done so by pages, causing the early memblock_alloc requests to be re-used, which in my case, caused the device-tree to be clobbered. This patch forces the reserved memory for initrd to be kernel page aligned, and will move the device tree if it overlaps with the range extension of initrd. This patch will also consolidate the identical function free_initrd_mem() from mm/init_32.c, init_64.c to mm/mem.c, and adds the same range extension when freeing initrd. free_initrd_mem() is also moved to the __init section. Many thanks to Milton Miller for his input on this patch. [BenH: Fixed build without CONFIG_BLK_DEV_INITRD] Signed-off-by: Dave Carroll <dcarroll@astekcorp.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* Merge remote branch 'kumar/merge' into mergeBenjamin Herrenschmidt2011-06-091-1/+1
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| * powerpc/book3e: Fix CPU feature handling on e5500 in 32-bit modeKumar Gala2011-06-021-1/+1
| | | | | | | | | | | | | | | | We are missing FPU feature bit that user space may require. In the 64-bit mode this gets set since we pull it in via COMMON_USER_PPC64. We just explicitly set it so user space will be happy again. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
* | Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds2011-05-271-1/+1
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm: (45 commits) ARM: 6945/1: Add unwinding support for division functions ARM: kill pmd_off() ARM: 6944/1: mm: allow ASID 0 to be allocated to tasks ARM: 6943/1: mm: use TTBR1 instead of reserved context ID ARM: 6942/1: mm: make TTBR1 always point to swapper_pg_dir on ARMv6/7 ARM: 6941/1: cache: ensure MVA is cacheline aligned in flush_kern_dcache_area ARM: add sendmmsg syscall ARM: 6863/1: allow hotplug on msm ARM: 6832/1: mmci: support for ST-Ericsson db8500v2 ARM: 6830/1: mach-ux500: force PrimeCell revisions ARM: 6829/1: amba: make hardcoded periphid override hardware ARM: 6828/1: mach-ux500: delete SSP PrimeCell ID ARM: 6827/1: mach-netx: delete hardcoded periphid ARM: 6940/1: fiq: Briefly document driver responsibilities for suspend/resume ARM: 6938/1: fiq: Refactor {get,set}_fiq_regs() for Thumb-2 ARM: 6914/1: sparsemem: fix highmem detection when using SPARSEMEM ARM: 6913/1: sparsemem: allow pfn_valid to be overridden when using SPARSEMEM at91: drop at572d940hf support at91rm9200: introduce at91rm9200_set_type to specficy cpu package at91: drop boot_params and PLAT_PHYS_OFFSET ...
| * \ Merge branches 'devel', 'devel-stable' and 'fixes' into for-linusRussell King2011-05-271-1/+1
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| | * \ Merge branch 'for-rmk' of git://github.com/at91linux/linux-2.6-at91 into ↵Russell King2011-05-261-1/+1
| | |\ \ | | | | | | | | | | | | | | | devel-stable
| | * \ \ Merge branch 'devicetree/arm-next' of git://git.secretlab.ca/git/linux-2.6 ↵Russell King2011-05-251-1/+1
| | |\ \ \ | | | | | | | | | | | | | | | | | | into devel-stable
| | | * | | dt/flattree: explicitly pass command line pointer to early_init_dt_scan_chosenGrant Likely2011-05-111-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch drops the reference to a global 'cmd_line' variable from early_init_dt_scan_chosen, and instead passes the pointer to the command line string via the *data argument. Each architecture does something slightly different with the initial command line, so it makes sense for the architecture to be able to specify the variable name. Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
* | | | | | Merge branch 'for-linus' of ↵Linus Torvalds2011-05-271-1/+0
|\ \ \ \ \ \ | |_|_|_|_|/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6: PM: Fix PM QOS's user mode interface to work with ASCII input PM / Hibernate: Update kerneldoc comments in hibernate.c PM / Hibernate: Remove arch_prepare_suspend() PM / Hibernate: Update some comments in core hibernate code
| * | | | | PM / Hibernate: Remove arch_prepare_suspend()Rafael J. Wysocki2011-05-241-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | All architectures supporting hibernation define arch_prepare_suspend() as an empty function, so remove it. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
* | | | | | Merge remote branch 'kumar/merge' into mergeBenjamin Herrenschmidt2011-05-271-0/+13
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| * | | | | | powerpc/fsl_rio: move machine_check handlerShaohui Xie2011-05-201-0/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add support for machine_check support into machine_check_e500 and machine_check_e500mc. Signed-off-by: Shaohui Xie <b21989@freescale.com> Cc: Li Yang <leoli@freescale.com> Cc: Roy Zang <tie-fei.zang@freescale.com> Cc: Alexandre Bounine <alexandre.bounine@idt.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
* | | | | | | powerpc: Fix irq_free_virt by adjusting bounds before loopMilton Miller2011-05-261-4/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Instead of looping over each irq and checking against the irq array bounds, adjust the bounds before looping. The old code will not free any irq if the irq + count is above irq_virq_count because the test in the loop is testing irq + count instead of irq + i. This code checks the limits to avoid unsigned integer overflows. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | | | | | | powerpc/irq: Protect irq_radix_revmap_lookup against irq_free_virtMilton Miller2011-05-261-2/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The radix-tree code uses call_rcu when freeing internal elements. We must protect against the elements being freed while we traverse the tree, even if the returned pointer will still be valid. While preparing a patch to expand the context in which irq_radix_revmap_lookup will be called, I realized that the radix tree was not locked. When asked For a normal call_rcu usage, is it allowed to read the structure in irq_enter / irq_exit, without additional rcu_read_lock? Could an element freed with call_rcu advance with the cpu still between irq_enter/irq_exit (and irq_disabled())? Paul McKenney replied: Absolutely illegal to do so. OK for call_rcu_sched(), but a flaming bug for call_rcu(). And thank you very much for finding this!!! Further analysis: In the current CONFIG_TREE_RCU implementation. CONFIG_TREE_PREEMPT_RCU (and CONFIG_TINY_PREEMPT_RCU) uses explicit counters. These counters are reflected from per-CPU to global in the scheduling-clock-interrupt handler, so disabling irq does prevent the grace period from completing. But there are real-time implementations (such as the one use by the Concurrent guys) where disabling irq does -not- prevent the grace period from completing. While an alternative fix would be to switch radix-tree to rcu_sched, I don't want to audit the other users of radix trees (nor put alternative freeing in the library). The normal overhead for rcu_read_lock and unlock are a local counter increment and decrement. This does not show up in the rcu lockdep because in 2.6.34 commit 2676a58c98 (radix-tree: Disable RCU lockdep checking in radix tree) deemed it too hard to pass the condition of the protecting lock to the library. Signed-off-by: Milton Miller <miltonm@bga.com> Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | | | | | | powerpc/irq: Check desc in handle_one_irq and expand generic_handle_irqMilton Miller2011-05-261-2/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Look up the descriptor and check that it is found in handle_one_irq before checking if we are on the irq stack, and call the handler directly using the descriptor if we are on the stack. We need check irq_to_desc finds the descriptor to avoid a NULL pointer dereference. It could have failed because the number from ppc_md.get_irq was above NR_IRQS, or various exceptional conditions with sparse irqs (eg race conditions while freeing an irq if its was not shutdown in the controller). fe12bc2c99 (genirq: Uninline and sanity check generic_handle_irq()) moved generic_handle_irq out of line to allow its use by interrupt controllers in modules. However, handle_one_irq is core arch code. It already knows the details of struct irq_desc and handling irqs in the nested irq case. This will avoid the extra stack frame to return the value we don't check. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | | | | | | powerpc/irq: Always free duplicate IRQ_LEGACY hostsMilton Miller2011-05-261-9/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Since kmem caches are allocated before init_IRQ as noted in 3af259d155 (powerpc: Radix trees are available before init_IRQ), we now call kmalloc in all cases and can can always call kfree if we are asked to allocate a duplicate or conflicting IRQ_HOST_MAP_LEGACY host. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | | | | | | powerpc/irq: Remove stale and misleading commentMilton Miller2011-05-261-3/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The comment claims we will call host->ops->map() to update the flags if we find a previously established mapping, but we never did. We used to call remap, but that call was removed in da05198002 (powerpc: Remove irq_host_ops->remap hook). Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | | | | | | powerpc/cell: Use common smp ipi actionsMilton Miller2011-05-261-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The cell iic interrupt controller has enough software caused interrupts to use a unique interrupt for each of the 4 messages powerpc uses. This means each interrupt gets its own irq action/data combination. Use the seperate, optimized, arch common ipi action functions registered via the helper smp_request_message_ipi instead passing the message as action data to a single action that then demultipexes to the required acton via a switch statement. smp_request_message_ipi will register the action as IRQF_PER_CPU and IRQF_DISABLED, and WARN if the allocation fails for some reason, so no need to print on that failure. It will return positive if the message will not be used by the kernel, in which case we can free the virq. In addition to elimiating inefficient code, this also corrects the error that a kernel built with kexec but without a debugger would not register the ipi for kdump to notify the other cpus of a crash. This also restores the debugger action to be static to kernel/smp.c. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | | | | | | powerpc/ftrace: Implement raw syscall tracepoints on PowerPCIan Munsie2011-05-263-0/+19
| |_|/ / / / |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch implements the raw syscall tracepoints on PowerPC and exports them for ftrace syscalls to use. To minimise reworking existing code, I slightly re-ordered the thread info flags such that the new TIF_SYSCALL_TRACEPOINT bit would still fit within the 16 bits of the andi. instruction's UI field. The instructions in question are in /arch/powerpc/kernel/entry_{32,64}.S to and the _TIF_SYSCALL_T_OR_A with the thread flags to see if system call tracing is enabled. In the case of 64bit PowerPC, arch_syscall_addr and arch_syscall_match_sym_name are overridden to allow ftrace syscalls to work given the unusual system call table structure and symbol names that start with a period. Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | | | | | powerpc: mmu_gather reworkPeter Zijlstra2011-05-251-1/+22
| |_|_|_|/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix up powerpc to the new mmu_gather stuff. PPC has an extra batching queue to RCU free the actual pagetable allocations, use the ARCH extentions for that for now. For the ppc64_tlb_batch, which tracks the vaddrs to unhash from the hardware hash-table, keep using per-cpu arrays but flush on context switch and use a TLF bit to track the lazy_mmu state. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: David Miller <davem@davemloft.net> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Tony Luck <tony.luck@intel.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hugh Dickins <hughd@google.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | | | Merge branch 'for-2.6.40' of ↵Linus Torvalds2011-05-241-1/+1
|\ \ \ \ \ | |_|_|/ / |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu * 'for-2.6.40' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: percpu: Unify input section names percpu: Avoid extra NOP in percpu_cmpxchg16b_double percpu: Cast away printk format warning percpu: Always align percpu output section to PAGE_SIZE Fix up fairly trivial conflict in arch/x86/include/asm/percpu.h as per Tejun
| * | | | percpu: Always align percpu output section to PAGE_SIZETejun Heo2011-03-241-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Percpu allocator honors alignment request upto PAGE_SIZE and both the percpu addresses in the percpu address space and the translated kernel addresses should be aligned accordingly. The calculation of the former depends on the alignment of percpu output section in the kernel image. The linker script macros PERCPU_VADDR() and PERCPU() are used to define this output section and the latter takes @align parameter. Several architectures are using @align smaller than PAGE_SIZE breaking percpu memory alignment. This patch removes @align parameter from PERCPU(), renames it to PERCPU_SECTION() and makes it always align to PAGE_SIZE. While at it, add PCPU_SETUP_BUG_ON() checks such that alignment problems are reliably detected and remove percpu alignment comment recently added in workqueue.c as the condition would trigger BUG way before reaching there. For um, this patch raises the alignment of percpu area. As the area is in .init, there shouldn't be any noticeable difference. This problem was discovered by David Howells while debugging boot failure on mn10300. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Mike Frysinger <vapier@gentoo.org> Cc: uclinux-dist-devel@blackfin.uclinux.org Cc: David Howells <dhowells@redhat.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: user-mode-linux-devel@lists.sourceforge.net
* | | | | Merge branch 'for-linus' of ↵Linus Torvalds2011-05-231-1/+1
|\ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (39 commits) b43: fix comment typo reqest -> request Haavard Skinnemoen has left Atmel cris: typo in mach-fs Makefile Kconfig: fix copy/paste-ism for dell-wmi-aio driver doc: timers-howto: fix a typo ("unsgined") perf: Only include annotate.h once in tools/perf/util/ui/browsers/annotate.c md, raid5: Fix spelling error in comment ('Ofcourse' --> 'Of course'). treewide: fix a few typos in comments regulator: change debug statement be consistent with the style of the rest Revert "arm: mach-u300/gpio: Fix mem_region resource size miscalculations" audit: acquire creds selectively to reduce atomic op overhead rtlwifi: don't touch with treewide double semicolon removal treewide: cleanup continuations and remove logging message whitespace ath9k_hw: don't touch with treewide double semicolon removal include/linux/leds-regulator.h: fix syntax in example code tty: fix typo in descripton of tty_termios_encode_baud_rate xtensa: remove obsolete BKL kernel option from defconfig m68k: fix comment typo 'occcured' arch:Kconfig.locks Remove unused config option. treewide: remove extra semicolons ...
| * | | | | treewide: fix a few typos in commentsJustin P. Mattock2011-05-101-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - kenrel -> kernel - whetehr -> whether - ttt -> tt - sss -> ss Signed-off-by: Justin P. Mattock <justinmattock@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* | | | | | Merge branch 'kvm-updates/2.6.40' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds2011-05-231-0/+1
|\ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'kvm-updates/2.6.40' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (131 commits) KVM: MMU: Use ptep_user for cmpxchg_gpte() KVM: Fix kvm mmu_notifier initialization order KVM: Add documentation for KVM_CAP_NR_VCPUS KVM: make guest mode entry to be rcu quiescent state KVM: x86 emulator: Make jmp far emulation into a separate function KVM: x86 emulator: Rename emulate_grpX() to em_grpX() KVM: x86 emulator: Remove unused arg from emulate_pop() KVM: x86 emulator: Remove unused arg from writeback() KVM: x86 emulator: Remove unused arg from read_descriptor() KVM: x86 emulator: Remove unused arg from seg_override() KVM: Validate userspace_addr of memslot when registered KVM: MMU: Clean up gpte reading with copy_from_user() KVM: PPC: booke: add sregs support KVM: PPC: booke: save/restore VRSAVE (a.k.a. USPRG0) KVM: PPC: use ticks, not usecs, for exit timing KVM: PPC: fix exit accounting for SPRs, tlbwe, tlbsx KVM: PPC: e500: emulate SVR KVM: VMX: Cache vmcs segment fields KVM: x86 emulator: consolidate segment accessors KVM: VMX: Avoid reading %rip unnecessarily when handling exceptions ...
| * | | | | | KVM: PPC: booke: save/restore VRSAVE (a.k.a. USPRG0)Scott Wood2011-05-221-0/+1
| | |_|_|_|/ | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Linux doesn't use USPRG0 (now renamed VRSAVE in the architecture, even when Altivec isn't involved), but a guest might. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Alexander Graf <agraf@suse.de>
* | | | | | powerpc: Fix 32-bit SMP buildJosh Boyer2011-05-201-1/+1
| |_|_|/ / |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit 69e3cea8d5fd526 ("powerpc/smp: Make start_secondary_resume available to all CPU variants") introduced start_secondary_resume to misc_32.S, however it uses a 64-bit instruction which is not valid on 32-bit platforms. Use 'stw' instead. Reported-by: Richard Cochran <richardcochran@gmail.com> Tested-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | | | powerpc: Fix hard CPU IDs detectionBenjamin Herrenschmidt2011-05-201-4/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | commit 9d07bc841c9779b4d7902e417f4e509996ce805d "powerpc: Properly handshake CPUs going out of boot spin loop" Would cause a miscalculation of the hard CPU ID. It removes breaking out of the loop when finding a match with a processor, thus the "i" used as an index in the intserv array is always incorrect This broke interrupt on my PowerMac laptop. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | | | | Merge remote branch 'origin/master' into mergeBenjamin Herrenschmidt2011-05-202-3/+2
|\ \ \ \ \ | | |_|_|/ | |/| | | | | | | | | | | | | | | | | | | | | | | Manual merge of arch/powerpc/kernel/smp.c and add missing scheduler_ipi() call to arch/powerpc/platforms/cell/interrupt.c Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| * | | | Merge branch 'driver-core-next' of ↵Linus Torvalds2011-05-191-1/+0
| |\ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 * 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6: (44 commits) debugfs: Silence DEBUG_STRICT_USER_COPY_CHECKS=y warning sysfs: remove "last sysfs file:" line from the oops messages drivers/base/memory.c: fix warning due to "memory hotplug: Speed up add/remove when blocks are larger than PAGES_PER_SECTION" memory hotplug: Speed up add/remove when blocks are larger than PAGES_PER_SECTION SYSFS: Fix erroneous comments for sysfs_update_group(). driver core: remove the driver-model structures from the documentation driver core: Add the device driver-model structures to kerneldoc Translated Documentation/email-clients.txt RAW driver: Remove call to kobject_put(). reboot: disable usermodehelper to prevent fs access efivars: prevent oops on unload when efi is not enabled Allow setting of number of raw devices as a module parameter Introduce CONFIG_GOOGLE_FIRMWARE driver: Google Memory Console driver: Google EFI SMI x86: Better comments for get_bios_ebda() x86: get_bios_ebda_length() misc: fix ti-st build issues params.c: Use new strtobool function to process boolean inputs debugfs: move to new strtobool ... Fix up trivial conflicts in fs/debugfs/file.c due to the same patch being applied twice, and an unrelated cleanup nearby.
| | * | | | sysfs: remove "last sysfs file:" line from the oops messagesGreg Kroah-Hartman2011-05-131-1/+0
| | | |/ / | | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On some arches (x86, sh, arm, unicore, powerpc) the oops message would print out the last sysfs file accessed. This was very useful in finding a number of sysfs and driver core bugs in the 2.5 and early 2.6 development days, but it has been a number of years since this file has actually helped in debugging anything that couldn't also be trivially determined from the stack traceback. So it's time to delete the line. This is good as we need all the space we can get for oops messages at times on consoles. Acked-by: Phil Carmody <ext-phil.2.carmody@nokia.com> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| * | | | Merge commit 'v2.6.39-rc7' into sched/coreIngo Molnar2011-05-121-1/+11
| |\ \ \ \ | | | |/ / | | |/| |
| * | | | Merge commit 'v2.6.39-rc4' into sched/coreIngo Molnar2011-04-215-17/+45
| |\ \ \ \ | | | |/ / | | |/| | | | | | | | | | | | | | | | | Merge reason: Pick up upstream fixes. Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | | sched: Provide scheduler_ipi() callback in response to smp_send_reschedule()Peter Zijlstra2011-04-141-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | For future rework of try_to_wake_up() we'd like to push part of that function onto the CPU the task is actually going to run on. In order to do so we need a generic callback from the existing scheduler IPI. This patch introduces such a generic callback: scheduler_ipi() and implements it as a NOP. BenH notes: PowerPC might use this IPI on offline CPUs under rare conditions! Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Acked-by: Chris Metcalf <cmetcalf@tilera.com> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Reviewed-by: Frank Rowand <frank.rowand@am.sony.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20110405152728.744338123@chello.nl
* | | | | Merge remote branch 'kumar/next' into nextBenjamin Herrenschmidt2011-05-203-3/+120
|\ \ \ \ \
| * | | | | powerpc/e5500: set non-base IVORsScott Wood2011-05-192-0/+50
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Without this, we attempt to use doorbells for IPIs, and end up branching to some bad address. Plus, even for the exceptions we don't implement, it's good to handle it and get a message out. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
generated by cgit v1.1 at 2024-09-03 23:04:01 +0000