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2009-01-28powerpc/pseries: Correct VIO bus accounting problem in CMO env.Robert Jennings
In the VIO bus code the wrappers for dma alloc_coherent and free_coherent calls are rounding to IOMMU_PAGE_SIZE. Taking a look at the underlying calls, the actual mapping is promoted to PAGE_SIZE. Changing the rounding in these two functions fixes under-reporting the entitlement used by the system. Without this change, the system could run out of entitlement before it believes it has and incur mapping failures at the firmware level. Also in the VIO bus code, the wrapper for dma map_sg is not exiting in an error path where it should. Rather than fall through to code for the success case, this patch adds the return that is needed in the error path. Signed-off-by: Robert Jennings <rcj@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-01-16powerpc: Get the number of SLBs from "slb-size" propertyMichael Neuling
The PAPR says that the property for specifying the number of SLBs should be called "slb-size". We currently only look for "ibm,slb-size" because this is what firmware actually presents. This patch makes us look for the "slb-size" property as well and in preference to the "ibm,slb-size". This should future proof us if firmware changes to match PAPR. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-01-13powerpc/e500mc: Doorbells need to be taken w/exceptions disabledKumar Gala
We use Doorbell interrupts for IPIs and thus we need to make sure we aren't interrupted in the process of processing the IPI. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Acked-by: Dave Liu <daveliu@freescale.com>
2009-01-13powerpc/powermac: Fix occasional SMP boot failureBenjamin Herrenschmidt
The PowerMac kernel occasionally fails to bring up the secondary CPUs on SMP, the trigger factor seem to be fairly random and related to location of code and data. This appears to be due to the initial loading of the TOC value by the secondary processor which now happens before we clear HID4:RM_CI (Real Mode Cache Invalidate). This bit should really be cleared before we do any load or store other than fetching code. This fix works based on the assumption that all SMP 64-bit PowerMacs use variants of the 970, which fortunately is true, by explicitely clearing that bit, adding an slbia for good measure as RM_CI mode is known to create bogus ERAT entries. I also removed some spurrious debug output that was left enabled by mistake while at it. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-01-13powerpc/cacheinfo: Rename cache_dir per-cpu variableNathan Lynch
The per_cpu__ prefix on DECLARE_PER_CPU'd variables is going away; rename cache_dir to cache_dir_pcpu. Signed-off-by: Nathan Lynch <ntl@pobox.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-01-13powerpc: Cleanup from l64 to ll64 change: arch codeStephen Rothwell
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-01-13powerpc: Change u64/s64 to a long long integer typeIngo Molnar
Convert arch/powerpc/ over to long long based u64: -#ifdef __powerpc64__ -# include <asm-generic/int-l64.h> -#else -# include <asm-generic/int-ll64.h> -#endif +#include <asm-generic/int-ll64.h> This will avoid reoccuring spurious warnings in core kernel code that comes when people test on their own hardware. (i.e. x86 in ~98% of the cases) This is what x86 uses and it generally helps keep 64-bit code 32-bit clean too. [Adjusted to not impact user mode (from paulus) - sfr] Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-01-13powerpc/kexec: Check crash_base for relocatable kernelMilton Miller
Enforce that the crash kernel region never overlaps the current kernel, as it will be written directly on kexec load. Also, default to the previous KDUMP_KERNELBASE if the start is 0. Other architectures (x86, ia64) state that specifying the start address 0 (or omitting it) will result in the kernel allocating it. Before the relocatable patch in 2.6.28, powerpc would adjust any other start value to the hardcoded KDUMP_KERNELBASE of 32M. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-01-13powerpc: Make dummy section a valid note headerMilton Miller
We are declaring the dummy section (used to work around a binutils bug) as PT_NOTE, but we don't have enough bytes for it to be a valid note header, and kexec userspace complains: Warning: Elf Note name is not null terminated Warning: append= option is not passed. Using the first kernel root partition Warning: Elf Note name is not null terminated Instead of using the arbitray value 0xf177 (aka "fill"), declare a no-name no-description note of type 0. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-01-13Merge commit 'kumar/kumar-next' into nextBenjamin Herrenschmidt
2009-01-08powerpc: Export cacheable_memzero as its now used in a driverKumar Gala
The Freescale PowerPC specific gianfar driver (gig-e) uses cacheable_memzero for performance reasons we need to export the symbol to allow the driver to be built as a module. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-01-08powerpc: Use correct type in prom_init.cIngo Molnar
tce_entryp is a "u64 *" not an "unsigned long *". [Split from a large patch -sfr] Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-01-08powerpc: Remove unnecessary castsStephen Rothwell
of_get_flat_dt_prop() returns a "void *", so we don't need to cast when assigning its result to a pointer variable. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-01-08powerpc: Fix pciconfig_iobase system call on PCI-Express powermacPaul Mackerras
X has been failing to start on my quad G5 powermac since commit 1fd0f52583a85b21a394201b007bc1ee104b235d ("powerpc: Fix domain numbers in /proc on 64-bit") went in. The reason is that the change allows X to see the PCI-PCI bridge above the video card (previously it was obscured by the fact that there were two "00" directories in /proc/bus/pci), and the pciconfig_iobase system call on the bridge is failing because of a hack that we have to return information about the AGP bus when X asks about bus 0. This machine doesn't have an AGP bus (it has PCI Express) and so the pciconfig_iobase call is returning -1, which ultimately causes X to fail to start. This fixes it by checking that we have an AGP bridge before redirecting the pciconfig_iobase call to return information about the AGP bus. With this, X starts successfully both on a quad G5 with PCI Express and on an older dual G5 with AGP. Signed-off-by: Paul Mackerras <paulus@samba.org> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-01-08powerpc: Rewrite sysfs processor cache info codeNathan Lynch
The current code for providing processor cache information in sysfs has the following deficiencies: - several complex functions that are hard to understand - implicit recursion (cache_desc_release -> kobject_put -> cache_desc_release) - explicit recursion (create_cache_index_info) - use of two per-cpu arrays when one would suffice - duplication of work on systems where CPUs share cache Also, when I looked at implementing support for a shared_cpu_map attribute, it was pretty much impossible to handle hotplug without checking every single online CPU's cache_desc list and fixing things up... not that this is a hot path, but it would have introduced O(n^2)-ish behavior during boot. Addressing this involved rethinking the core data structures used, which didn't lend itself to an incremental approach. This implementation maintains a "forest" (potentially more than one tree) of cache objects which reflects the system's cache topology. Cache objects are instantiated as needed as CPUs come online. A per-cpu array is used mainly for sysfs-related bookkeeping; the objects in the array just point to the appropriate points in the forest. This maintains compatibility with the existing code and includes some enhancements: - Implement the shared_cpu_map attribute, which is essential for enabling userspace to discover the system's overall cache topology. - Use cache-block-size properties if cache-line-size is not available. I chose to place this implementation in a new file since it would have roughly doubled the size of sysfs.c, which is already kind of messy. Signed-off-by: Nathan Lynch <ntl@pobox.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-01-08powerpc/pci: Reserve legacy regions on PCIBenjamin Herrenschmidt
There's a problem on some embedded platforms when we re-assign everything on PCI, such as 44x. The generic code tries to avoid assigning devices to addresses overlapping the low legacy addresses such as VGA hard decoded areas using constants that are unfortunately no good for us, as they don't take into account the address translation we do to access PCI busses. Thus we end up allocating things like IO BARs to 0, which is technically legal, but will shadow hard decoded ports for use by things like VGA cards. This works around it by attempting to reserve legacy regions before we try to assign addresses. NOTE: This may have nasty side effects in cases I haven't tested yet: - We try to use FW mappings (ie. powermac) and the FW has allocated a conflicting address over those legacy regions. This will typically happen. I would expect the new code to just fail with an informative message without harm but I haven't had a chance to test that scenario yet. - A device with fixed BARs overlapping those legacy addresses such as an IDE controller in legacy mode is in the system. I don't know for sure yet what will happen there, I have to test :-) Ideally, we should change PCIBIOS_MIN_IO/MIN_MEM accross the board to take a bus pointer so they can provide appropriate per-bus translated values to the generic code but that's a more invasive patch. I will do that in the future, but in the meantime, this fixes the problem locally Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-01-07Merge branch 'linux-next' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 * 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6: (98 commits) PCI PM: Put PM callbacks in the order of execution PCI PM: Run default PM callbacks for all devices using new framework PCI PM: Register power state of devices during initialization PCI PM: Call pci_fixup_device from legacy routines PCI PM: Rearrange code in pci-driver.c PCI PM: Avoid touching devices behind bridges in unknown state PCI PM: Move pci_has_legacy_pm_support PCI PM: Power-manage devices without drivers during suspend-resume PCI PM: Add suspend counterpart of pci_reenable_device PCI PM: Fix poweroff and restore callbacks PCI: Use msleep instead of cpu_relax during ASPM link retraining PCI: PCIe portdrv: Add kerneldoc comments to remining core funtions PCI: PCIe portdrv: Rearrange code so that related things are together PCI: PCIe portdrv: Fix suspend and resume of PCI Express port services PCI: PCIe portdrv: Add kerneldoc comments to some core functions x86/PCI: Do not use interrupt links for devices using MSI-X net: sfc: Use pci_clear_master() to disable bus mastering PCI: Add pci_clear_master() as opposite of pci_set_master() PCI hotplug: remove redundant test in cpq hotplug PCI: pciehp: cleanup register and field definitions ...
2009-01-07powerpc/fsl-booke: Remove num_tlbcam_entriesTrent Piepho
This is a global variable defined in fsl_booke_mmu.c with a value that gets initialized in assembly code in head_fsl_booke.S. It's never used. If some code ever does want to know the number of entries in TLB1, then "numcams = mfspr(SPRN_TLB1CFG) & 0xfff", is a whole lot simpler than a global initialized during kernel boot from assembly. Signed-off-by: Trent Piepho <tpiepho@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2009-01-07powerpc/fsl-booke: Don't hard-code size of struct tlbcamTrent Piepho
Some assembly code in head_fsl_booke.S hard-coded the size of struct tlbcam to 20 when it indexed the TLBCAM table. Anyone changing the size of struct tlbcam would not know to expect that. The kernel already has a system to get the size of C structures into assembly language files, asm-offsets, so let's use it. The definition of the struct gets moved to a header, so that asm-offsets.c can include it. Signed-off-by: Trent Piepho <tpiepho@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2009-01-07Merge branch 'for-linus' of ↵Linus Torvalds
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: (24 commits) trivial: chack -> check typo fix in main Makefile trivial: Add a space (and a comma) to a printk in 8250 driver trivial: Fix misspelling of "firmware" in docs for ncr53c8xx/sym53c8xx trivial: Fix misspelling of "firmware" in powerpc Makefile trivial: Fix misspelling of "firmware" in usb.c trivial: Fix misspelling of "firmware" in qla1280.c trivial: Fix misspelling of "firmware" in a100u2w.c trivial: Fix misspelling of "firmware" in megaraid.c trivial: Fix misspelling of "firmware" in ql4_mbx.c trivial: Fix misspelling of "firmware" in acpi_memhotplug.c trivial: Fix misspelling of "firmware" in ipw2100.c trivial: Fix misspelling of "firmware" in atmel.c trivial: Fix misspelled firmware in Kconfig trivial: fix an -> a typos in documentation and comments trivial: fix then -> than typos in comments and documentation trivial: update Jesper Juhl CREDITS entry with new email trivial: fix singal -> signal typo trivial: Fix incorrect use of "loose" in event.c trivial: printk: fix indentation of new_text_line declaration trivial: rtc-stk17ta8: fix sparse warning ...
2009-01-07PCI: powerpc: use generic pci_swizzle_interrupt_pin()Bjorn Helgaas
Use the generic pci_swizzle_interrupt_pin() instead of arch-specific code. Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-01-06kprobes: add kprobe_insn_mutex and cleanup arch_remove_kprobe()Masami Hiramatsu
Add kprobe_insn_mutex for protecting kprobe_insn_pages hlist, and remove kprobe_mutex from architecture dependent code. This allows us to call arch_remove_kprobe() (and free_insn_slot) while holding kprobe_mutex. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-01-06trivial: fix then -> than typos in comments and documentationFrederik Schwarzer
- (better, more, bigger ...) then -> (...) than Signed-off-by: Frederik Schwarzer <schwarzerf@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-01-03Merge branch 'cputime' of git://git390.osdl.marist.edu/pub/scm/linux-2.6Linus Torvalds
* 'cputime' of git://git390.osdl.marist.edu/pub/scm/linux-2.6: [PATCH] fast vdso implementation for CLOCK_THREAD_CPUTIME_ID [PATCH] improve idle cputime accounting [PATCH] improve precision of idle time detection. [PATCH] improve precision of process accounting. [PATCH] idle cputime accounting [PATCH] fix scaled & unscaled cputime accounting
2009-01-02Merge branch 'cpus4096-for-linus-2' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'cpus4096-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (66 commits) x86: export vector_used_by_percpu_irq x86: use logical apicid in x2apic_cluster's x2apic_cpu_mask_to_apicid_and() sched: nominate preferred wakeup cpu, fix x86: fix lguest used_vectors breakage, -v2 x86: fix warning in arch/x86/kernel/io_apic.c sched: fix warning in kernel/sched.c sched: move test_sd_parent() to an SMP section of sched.h sched: add SD_BALANCE_NEWIDLE at MC and CPU level for sched_mc>0 sched: activate active load balancing in new idle cpus sched: bias task wakeups to preferred semi-idle packages sched: nominate preferred wakeup cpu sched: favour lower logical cpu number for sched_mc balance sched: framework for sched_mc/smt_power_savings=N sched: convert BALANCE_FOR_xx_POWER to inline functions x86: use possible_cpus=NUM to extend the possible cpus allowed x86: fix cpu_mask_to_apicid_and to include cpu_online_mask x86: update io_apic.c to the new cpumask code x86: Introduce topology_core_cpumask()/topology_thread_cpumask() x86: xen: use smp_call_function_many() x86: use work_on_cpu in x86/kernel/cpu/mcheck/mce_amd_64.c ... Fixed up trivial conflict in kernel/time/tick-sched.c manually
2009-01-02Merge branch 'kvm-updates/2.6.29' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm * 'kvm-updates/2.6.29' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm: (140 commits) KVM: MMU: handle large host sptes on invlpg/resync KVM: Add locking to virtual i8259 interrupt controller KVM: MMU: Don't treat a global pte as such if cr4.pge is cleared MAINTAINERS: Maintainership changes for kvm/ia64 KVM: ia64: Fix kvm_arch_vcpu_ioctl_[gs]et_regs() KVM: x86: Rework user space NMI injection as KVM_CAP_USER_NMI KVM: VMX: Fix pending NMI-vs.-IRQ race for user space irqchip KVM: fix handling of ACK from shared guest IRQ KVM: MMU: check for present pdptr shadow page in walk_shadow KVM: Consolidate userspace memory capability reporting into common code KVM: Advertise the bug in memory region destruction as fixed KVM: use cpumask_var_t for cpus_hardware_enabled KVM: use modern cpumask primitives, no cpumask_t on stack KVM: Extract core of kvm_flush_remote_tlbs/kvm_reload_remote_mmus KVM: set owner of cpu and vm file operations anon_inodes: use fops->owner for module refcount x86: KVM guest: kvm_get_tsc_khz: return khz, not lpj KVM: MMU: prepopulate the shadow on invlpg KVM: MMU: skip global pgtables on sync due to cr3 switch KVM: MMU: collapse remote TLB flushes on root sync ...
2008-12-31take init_fs to saner placeAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-12-31KVM: ppc: Implement in-kernel exit timing statisticsHollis Blanchard
Existing KVM statistics are either just counters (kvm_stat) reported for KVM generally or trace based aproaches like kvm_trace. For KVM on powerpc we had the need to track the timings of the different exit types. While this could be achieved parsing data created with a kvm_trace extension this adds too much overhead (at least on embedded PowerPC) slowing down the workloads we wanted to measure. Therefore this patch adds a in-kernel exit timing statistic to the powerpc kvm code. These statistic is available per vm&vcpu under the kvm debugfs directory. As this statistic is low, but still some overhead it can be enabled via a .config entry and should be off by default. Since this patch touched all powerpc kvm_stat code anyway this code is now merged and simplified together with the exit timing statistic code (still working with exit timing disabled in .config). Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: directly insert shadow mappings into the hardware TLBHollis Blanchard
Formerly, we used to maintain a per-vcpu shadow TLB and on every entry to the guest would load this array into the hardware TLB. This consumed 1280 bytes of memory (64 entries of 16 bytes plus a struct page pointer each), and also required some assembly to loop over the array on every entry. Instead of saving a copy in memory, we can just store shadow mappings directly into the hardware TLB, accepting that the host kernel will clobber these as part of the normal 440 TLB round robin. When we do that we need less than half the memory, and we have decreased the exit handling time for all guest exits, at the cost of increased number of TLB misses because the host overwrites some guest entries. These savings will be increased on processors with larger TLBs or which implement intelligent flush instructions like tlbivax (which will avoid the need to walk arrays in software). In addition to that and to the code simplification, we have a greater chance of leaving other host userspace mappings in the TLB, instead of forcing all subsequent tasks to re-fault all their mappings. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: create struct kvm_vcpu_44x and introduce container_of() accessorHollis Blanchard
This patch doesn't yet move all 44x-specific data into the new structure, but is the first step down that path. In the future we may also want to create a struct kvm_vcpu_booke. Based on patch from Liu Yu <yu.liu@freescale.com>. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: Rename "struct tlbe" to "struct kvmppc_44x_tlbe"Hollis Blanchard
This will ease ports to other cores. Also remove unused "struct kvm_tlb" while we're at it. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31[PATCH] idle cputime accountingMartin Schwidefsky
The cpu time spent by the idle process actually doing something is currently accounted as idle time. This is plain wrong, the architectures that support VIRT_CPU_ACCOUNTING=y can do better: distinguish between the time spent doing nothing and the time spent by idle doing work. The first is accounted with account_idle_time and the second with account_system_time. The architectures that use the account_xxx_time interface directly and not the account_xxx_ticks interface now need to do the check for the idle process in their arch code. In particular to improve the system vs true idle time accounting the arch code needs to measure the true idle time instead of just testing for the idle process. To improve the tick based accounting as well we would need an architecture primitive that can tell us if the pt_regs of the interrupted context points to the magic instruction that halts the cpu. In addition idle time is no more added to the stime of the idle process. This field now contains the system time of the idle process as it should be. On systems without VIRT_CPU_ACCOUNTING this will always be zero as every tick that occurs while idle is running will be accounted as idle time. This patch contains the necessary common code changes to be able to distinguish idle system time and true idle time. The architectures with support for VIRT_CPU_ACCOUNTING need some changes to exploit this. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2008-12-31[PATCH] fix scaled & unscaled cputime accountingMartin Schwidefsky
The utimescaled / stimescaled fields in the task structure and the global cpustat should be set on all architectures. On s390 the calls to account_user_time_scaled and account_system_time_scaled never have been added. In addition system time that is accounted as guest time to the user time of a process is accounted to the scaled system time instead of the scaled user time. To fix the bugs and to prevent future forgetfulness this patch merges account_system_time_scaled into account_system_time and account_user_time_scaled into account_user_time. Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Chris Wright <chrisw@sous-sol.org> Cc: Michael Neuling <mikey@neuling.org> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2008-12-28Merge branch 'next' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: (144 commits) powerpc/44x: Support 16K/64K base page sizes on 44x powerpc: Force memory size to be a multiple of PAGE_SIZE powerpc/32: Wire up the trampoline code for kdump powerpc/32: Add the ability for a classic ppc kernel to be loaded at 32M powerpc/32: Allow __ioremap on RAM addresses for kdump kernel powerpc/32: Setup OF properties for kdump powerpc/32/kdump: Implement crash_setup_regs() using ppc_save_regs() powerpc: Prepare xmon_save_regs for use with kdump powerpc: Remove default kexec/crash_kernel ops assignments powerpc: Make default kexec/crash_kernel ops implicit powerpc: Setup OF properties for ppc32 kexec powerpc/pseries: Fix cpu hotplug powerpc: Fix KVM build on ppc440 powerpc/cell: add QPACE as a separate Cell platform powerpc/cell: fix build breakage with CONFIG_SPUFS disabled powerpc/mpc5200: fix error paths in PSC UART probe function powerpc/mpc5200: add rts/cts handling in PSC UART driver powerpc/mpc5200: Make PSC UART driver update serial errors counters powerpc/mpc5200: Remove obsolete code from mpc5200 MDIO driver powerpc/mpc5200: Add MDMA/UDMA support to MPC5200 ATA driver ... Fix trivial conflict in drivers/char/Makefile as per Paul's directions
2008-12-29powerpc/44x: Support 16K/64K base page sizes on 44xIlya Yanok
This adds support for 16k and 64k page sizes on PowerPC 44x processors. The PGDIR table is much smaller than a page when using 16k or 64k pages (512 and 32 bytes respectively) so we allocate the PGDIR with kzalloc() instead of __get_free_pages(). One PTE table covers rather a large memory area when using 16k or 64k pages (32MB or 512MB respectively), so we can easily put FIXMAP and PKMAP in the area covered by one PTE table. Signed-off-by: Yuri Tikhonov <yur@emcraft.com> Signed-off-by: Vladimir Panfilov <pvr@emcraft.com> Signed-off-by: Ilya Yanok <yanok@emcraft.com> Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-12-29powerpc: Force memory size to be a multiple of PAGE_SIZEHollis Blanchard
Ensure that total memory size is page-aligned, because otherwise mark_bootmem() gets upset. This error case was triggered by using 64 KiB pages in the kernel while arch/powerpc/boot/4xx.c arbitrarily reduced the amount of memory by 4096 (to work around a chip bug that affects the last 256 bytes of physical memory). Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-12-28Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6Linus Torvalds
* 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6: (85 commits) [S390] provide documentation for hvc_iucv kernel parameter. [S390] convert ctcm printks to dev_xxx and pr_xxx macros. [S390] convert zfcp printks to pr_xxx macros. [S390] convert vmlogrdr printks to pr_xxx macros. [S390] convert zfcp dumper printks to pr_xxx macros. [S390] convert cpu related printks to pr_xxx macros. [S390] convert qeth printks to dev_xxx and pr_xxx macros. [S390] convert sclp printks to pr_xxx macros. [S390] convert iucv printks to dev_xxx and pr_xxx macros. [S390] convert ap_bus printks to pr_xxx macros. [S390] convert dcssblk and extmem printks messages to pr_xxx macros. [S390] convert monwriter printks to pr_xxx macros. [S390] convert s390 debug feature printks to pr_xxx macros. [S390] convert monreader printks to pr_xxx macros. [S390] convert appldata printks to pr_xxx macros. [S390] convert setup printks to pr_xxx macros. [S390] convert hypfs printks to pr_xxx macros. [S390] convert time printks to pr_xxx macros. [S390] convert cpacf printks to pr_xxx macros. [S390] convert cio printks to pr_xxx macros. ...
2008-12-25[S390] arch_setup_additional_pages argumentsMartin Schwidefsky
arch_setup_additional_pages currently gets two arguments, the binary format descripton and an indication if the process uses an executable stack or not. The second argument is not used by anybody, it could be removed without replacement. What actually does make sense is to pass an indication if the process uses the elf interpreter or not. The glibc code will not use anything from the vdso if the process does not use the dynamic linker, so for statically linked binaries the architecture backend can choose not to map the vdso. Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2008-12-23powerpc/32: Wire up the trampoline code for kdumpDale Farnsworth
Wire up the trampoline code for ppc32 to relay exceptions from the vectors at address 0 to vectors at address 32MB, and modify Kconfig to enable Kdump support for all classic powerpcs. Signed-off-by: Dale Farnsworth <dale@farnsworth.org> Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-12-23powerpc/32: Add the ability for a classic ppc kernel to be loaded at 32MDale Farnsworth
Add the ability for a classic ppc kernel to be loaded at an address of 32MB. This done by fixing a few places that assume we are loaded at address 0, and by changing several uses of KERNELBASE to use PAGE_OFFSET, instead. Signed-off-by: Dale Farnsworth <dale@farnsworth.org> Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-12-23powerpc/32: Setup OF properties for kdumpDale Farnsworth
Refactor the setting of kdump OF properties, moving the common code from machine_kexec_64.c to machine_kexec.c where it can be used on both ppc64 and ppc32. This will be needed for kdump to work on ppc32 platforms. Signed-off-by: Dale Farnsworth <dale@farnsworth.org> Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-12-23powerpc/32/kdump: Implement crash_setup_regs() using ppc_save_regs()Anton Vorontsov
This replaces the dummy crash_setup_regs function with full-fledged crash_setup_regs implementation. On PPC32 we simply use the new ppc_save_regs function to dump the registers. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-12-23powerpc: Prepare xmon_save_regs for use with kdumpAnton Vorontsov
Today the arch/powerpc/xmon/setjmp.S file contains only the xmon_save_regs function. We want to use it for kdump purposes, so let's move the file into arch/powerpc/kernel/ and give the function a more generic name (ppc_save_regs). Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-12-23powerpc: Make default kexec/crash_kernel ops implicitAnton Vorontsov
This removes the need for each platform to specify default kexec and crash kernel ops, thus effectively adds a working kexec support for most 6xx/7xx/7xxx-based boards. Platforms that can't cope with default ops will explode in some weird way (a hang or reboot is most likely), which means that the board's kexec support should be fixed or blacklisted via dummy _prepare callback returning -ENOSYS. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-12-23powerpc: Setup OF properties for ppc32 kexecDale Farnsworth
Refactor the setting of kexec OF properties, moving the common code from machine_kexec_64.c to machine_kexec.c where it can be used on both ppc64 and ppc32. This is needed for kexec to work on ppc32 platforms. Signed-off-by: Dale Farnsworth <dale@farnsworth.org> Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-12-21powerpc/44x: 44x TLB doesn't need "Guarded" set for all pagesBenjamin Herrenschmidt
After discussing with chip designers, it appears that it's not necessary to set G everywhere on 440 cores. The various core errata related to prefetch should be sorted out by firmware by disabling icache prefetching in CCR0. We add the workaround to the kernel however just in case oooold firmwares don't do it. This is valid for -all- 4xx core variants. Later ones hard wire the absence of prefetch but it doesn't harm to clear the bits in CCR0 (they should already be cleared anyway). We still leave G=1 on the linear mapping for now, we need to stop over-mapping RAM to be able to remove it. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Kumar Gala <galak@kernel.crashing.org> Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-12-21powerpc/mm: Rework usage of _PAGE_COHERENT/NO_CACHE/GUARDEDBenjamin Herrenschmidt
Currently, we never set _PAGE_COHERENT in the PTEs, we just OR it in in the hash code based on some CPU feature bit. We also manipulate _PAGE_NO_CACHE and _PAGE_GUARDED by hand in all sorts of places. This changes the logic so that instead, the PTE now contains _PAGE_COHERENT for all normal RAM pages thay have I = 0 on platforms that need it. The hash code clears it if the feature bit is not set. It also adds some clean accessors to setup various valid combinations of access flags and change various bits of code to use them instead. This should help having the PTE actually containing the bit combinations that we really want. I also removed _PAGE_GUARDED from _PAGE_BASE on 44x and instead set it explicitely from the TLB miss. I will ultimately remove it completely as it appears that it might not be needed after all but in the meantime, having it in the TLB miss makes things a lot easier. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-12-21powerpc/mm: Runtime allocation of mmu context maps for nohash CPUsBenjamin Herrenschmidt
This makes the MMU context code used for CPUs with no hash table (except 603) dynamically allocate the various maps used to track the state of contexts. Only the main free map and CPU 0 stale map are allocated at boot time. Other CPU maps are allocated when those CPUs are brought up and freed if they are unplugged. This also moves the initialization of the MMU context management slightly later during the boot process, which should be fine as it's really only needed when userland if first started anyways. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-12-21powerpc/mm: Split low level tlb invalidate for nohash processorsBenjamin Herrenschmidt
Currently, the various forms of low level TLB invalidations are all implemented in misc_32.S for 32-bit processors, in a fairly scary mess of #ifdef's and with interesting duplication such as a whole bunch of code for FSL _tlbie and _tlbia which are no longer used. This moves things around such that _tlbie is now defined in hash_low_32.S and is only used by the 32-bit hash code, and all nohash CPUs use the various _tlbil_* forms that are now moved to a new file, tlb_nohash_low.S. I moved all the definitions for that stuff out of include/asm/tlbflush.h as they are really internal mm stuff, into mm/mmu_decl.h The code should have no functional changes. I kept some variants inline for trivial forms on things like 40x and 8xx. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-12-21powerpc/mm: Add SMP support to no-hash TLB handlingBenjamin Herrenschmidt
This commit moves the whole no-hash TLB handling out of line into a new tlb_nohash.c file, and implements some basic SMP support using IPIs and/or broadcast tlbivax instructions. Note that I'm using local invalidations for D->I cache coherency. At worst, if another processor is trying to execute the same and has the old entry in its TLB, it will just take a fault and re-do the TLB flush locally (it won't re-do the cache flush in any case). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>