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* powerpc: Fix PPC_PTRACE_SETHWDEBUG on PPC_BOOK3SAndreas Schwab2010-12-091-6/+16
| | | | | | | | | Properly set the DABR_TRANSLATION/DABR_DATA_READ/DABR_DATA_READ bits in the dabr when setting the debug register via PPC_PTRACE_SETHWDEBUG. Also don't reject trigger type of PPC_BREAKPOINT_TRIGGER_READ. Signed-off-by: Andreas Schwab <schwab@linux-m68k.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/time: printk time stamp init not correctHeiko Schocher2010-12-091-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | problem: I see sometimes on my mpc5200 based board such printk timing information: [ 0.000000] NR_IRQS:512 nr_irqs:512 16 [ 0.000000] MPC52xx PIC is up and running! [ 0.000000] clocksource: timebase mult[79364d9] shift[22] registered [ 0.000000] console [ttyPSC0] enabled [ 130.300633] pid_max: default: 32768 minimum: 301 [ 130.305647] Mount-cache hash table entries: 512 [ 130.315818] NET: Registered protocol family 16 reason: if the tbu not starts from 0 when linux boots, boot_tb maybe could not store the real 64 bit tbu value, because boot_tp is only a 32 bit unsigned long. solution: change boot_tb to u64 [BenH: Made it u64 instead of unsigned long long] Signed-off-by: Heiko Schocher <hs@denx.de> cc: Wolfgang Denk <wd@denx.de> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Minor cleanups for machdep.hSonny Rao2010-12-091-5/+1
| | | | | | | | | | | | Remove stale declaration of setup_pci_ptrs, aparently from ppc before 2.4.0 Remove #ifdef around struct existance delcaration Fix spelling of "linear" Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Sonny Rao <sonnyrao@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* Powerpc: separate CONFIG_RELOCATABLE from CONFIG_CRASHDUMP in boot codeSonny Rao2010-12-091-4/+2
| | | | | | | | | Fix head_64.S so that we can build a relocatable kernel that isn't necessarily a crash-dump kernel Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Sonny Rao <sonnyrao@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Fix incorrect comment about interrupt stack allocationAnton Blanchard2010-12-091-2/+2
| | | | | | | | We now allow interrupt stacks anywhere in the first segment which can be 256M or 1TB. Fix the comment. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Hardcode popcnt instructions for old assemblersAnton Blanchard2010-12-092-7/+15
| | | | | | | | The popcnt instructions went into binutils relatively recently. As with a number of other instructions, create macros and hardcode them. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/pseries: Pass phb only to iommu_table_setparms_lparBenjamin Herrenschmidt2010-12-091-7/+4
| | | | | | | | | | | | | | | | | iommu_table_setparms_lpar needs either the phb or the subbusnumber (not both), pass the phb to make it similar to iommu_table_setparms. Note: In cases where a caller was passing bus->number previously to iommu_table_setparms_lpar() rather than phb->bus->number, this can lead to a different value in tbl->it_busno. The only example of this was the removed pci_dma_dev_setup_pSeriesLP(), removed in "ppc/iommu: remove unneeded pci_dma_dev_setup_pSeriesLP". [BenH: You updated only one of the two callers. Fixed that for you] Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/pseries: Do not need to check for dma_window == NULLNishanth Aravamudan2010-12-091-6/+0
| | | | | | | | | | | | The block in pci_dma_dev_setup_pSeriesLP for dma_window == NULL can be removed because we will only teminate the loop if we had already allocated a iommu table for that node or we found a window. While there may be no window for the device, the intresting part is if we are reusing a table or creating it for the first device under it. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/pseries: Checking for pdn->parent is redundantNishanth Aravamudan2010-12-091-4/+1
| | | | | | | | | | | The device tree root is never a pci bus, and will not have a PCI_DN(pdn), so the check for PCI_DN added in 650f7b3b2f0ead0673e90452cf3dedde97c537ba makes the check for pdn->parent redundant and it can be removed. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/pseries: Do not search for dma-window property on dlpar removeNishanth Aravamudan2010-12-091-5/+1
| | | | | | | | | | | | | | The iommu_table pointer in the pci auxiliary struct of device_node has not been used by the iommu ops since the dma refactor of 12d04eef927bf61328af2c7cbe756c96f98ac3bf, however this code still uses it to find tables for dlpar. By only setting the PCI_DN iommu_table pointer on nodes with dma window properties, we will be able to quickly find the node for later checks, and can remove the table without looking for the the dma window property on dlpar remove. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/iommu: Use coherent_dma_mask for alloc_coherentNishanth Aravamudan2010-12-092-1/+5
| | | | | | | | | | | | | | The IOMMU code has been passing the dma-mask instead of the coherent_dma_mask to the iommu allocator. Coherent allocations should be made using the coherent_dma_mask. Also update the vio code to ensure the coherent_dma_mask is set. Without this change drivers, such as ibmvscsi, fail to load with the corrected dma_iommu_alloc_coherent(). Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* Merge remote branch 'jwb/next' into nextBenjamin Herrenschmidt2010-12-099-26/+439
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| * powerpc/4xx: Add Canyonlands suspend and idle supportVictor Gallardo2010-11-292-22/+12
| | | | | | | | | | | | | | | | | | | | | | | | - Add Clock Power Management (CPM) node to dts tree - Add idle-doze entry in CPM node - Add standby entry in CPM node - Add PM and SUSPEND support by default in defconfig - Remove UART2 and UART3 as they are unused, this will allow CPM to put unused-units (UART2 and UART3) to sleep. Signed-off-by: Victor Gallardo <vgallardo@apm.com> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
| * powerpc/4xx: Add Kilauea suspend and idle supportVictor Gallardo2010-11-292-0/+14
| | | | | | | | | | | | | | | | | | | | | | | | - Add Clock Power Management (CPM) node to dts tree - Add idle-doze entry in CPM node - Add standby entry in CPM node - Add PM and SUSPEND support by default in defconfig - Add NO_HZ and CONFIG_HIGH_RES_TIMERS support by default in defconfig Signed-off-by: Victor Gallardo <vgallardo@apm.com> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
| * powerpc/4xx: Add suspend and idle supportVictor Gallardo2010-11-295-4/+413
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add suspend/resume support for 4xx compatible CPUs. See /sys/power/state for available power states configured in. Add two different idle states (idle-wait and idle-doze) controlled via sysfs. Default is idle-wait. cat /sys/devices/system/cpu/cpu0/idle [wait] doze To save additional power, use idle-doze. echo doze > /sys/devices/system/cpu/cpu0/idle cat /sys/devices/system/cpu/cpu0/idle wait [doze] Signed-off-by: Victor Gallardo <vgallardo@apm.com> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
* | Merge branch 'nvram' into nextBenjamin Herrenschmidt2010-12-095-363/+381
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| * powerpc/nvram: Handle partition names >= 12 charsJim Keniston2010-11-301-2/+3
| | | | | | | | | | | | | | | | The name field in the nvram_header can be < 12 chars, null-terminated, or 12 chars without the null. Handle this safely. Signed-off-by: Jim Keniston <jkenisto@us.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| * powerpc/nvram: Fix NVRAM partition list setupJim Keniston2010-11-301-18/+8
| | | | | | | | | | | | | | Simplify creation and use of the NVRAM partition list. Signed-off-by: Jim Keniston <jkenisto@us.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| * powerpc/nvram: Rename ppc64,linux partition to ibm,rtas-logBenjamin Herrenschmidt2010-11-301-10/+13
| | | | | | | | | | | | | | | | I'm not aware of any userspace tool accessing it by its name anyways, it's read back by the kernel itself on the next boot to get back older log entries Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| * powerpc/nvram: Move the log partition stuff to pseriesBenjamin Herrenschmidt2010-11-303-237/+227
| | | | | | | | | | | | | | | | | | | | The nvram log partition stuff currently in nvram_64.c is really pseries specific. It isn't actually used on anything else (despite the fact that we ran the code to setup the partition on anything except powermac) and the log format is specific to pseries RTAS implementation. So move it where it belongs Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| * powerpc/nvram: Change nvram_setup_partition() to use new helperBenjamin Herrenschmidt2010-11-301-39/+32
| | | | | | | | | | | | | | | | This changes the function to use nvram_find_partition() instead of doing the lookup "by hand". It also makes some of the logic clearer and prints out more useful diagnostic information. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| * powerpc/nvram: Add nvram_find_partition()Benjamin Herrenschmidt2010-11-301-0/+22
| | | | | | | | Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| * powerpc/nvram: Improve partition removalBenjamin Herrenschmidt2010-11-301-48/+43
| | | | | | | | | | | | | | | | | | | | | | | | Existing code is nasty, has bugs etc... rewrite the function more simply, and make it take the signature and optional name of the partitions to remove as arguments, thus making it a more generic utility. We also try to remove a log partition that we find and is too small rather than creating a duplicate. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| * powerpc/nvram: Shuffle code around in nvram_create_partition()Benjamin Herrenschmidt2010-11-301-46/+62
| | | | | | | | | | | | | | | | | | | | | | This error log stuff is really pseries specific. As a first step we move the initialization of these variables to the caller of nvram_create_partition(), which is also slightly reorganized so we setup the free partition before we clear the new partition, so the chance of an error during clear leaving us with invalid headers is lessened. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| * powerpc/nvram: Completely clear a new partitionBenjamin Herrenschmidt2010-11-301-9/+10
| | | | | | | | | | | | | | | | When creating a partition, we clear it entirely rather than just the first two words since the previous code was rather specific to the pseries log partition format. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| * powerpc/nvram: Ensure that the partition header/block size is rightBenjamin Herrenschmidt2010-11-301-0/+2
| | | | | | | | | | | | | | Use BUILD_BUG_ON to ensure the structure representing a partition header have the right size. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| * powerpc/nvram: nvram_create_partitions() now uses bytesBenjamin Herrenschmidt2010-11-301-6/+14
| | | | | | | | | | | | | | | | | | | | This converts nvram_create_partition() to use a size in bytes rather than blocks. It does the appropriate alignment internally The size passed is also the data size (ie. doesn't include the header anymore). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| * powerpc/nvram: More flexible nvram_create_partition()Benjamin Herrenschmidt2010-11-302-21/+31
| | | | | | | | | | | | | | Replace nvram_create_os_partition() with a variant that takes the partition name, signature and size as arguments. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| * powerpc/nvram: Move things out of asm/nvram.hBenjamin Herrenschmidt2010-11-304-41/+28
| | | | | | | | | | | | | | | | | | This moves a bunch of definitions out of asm/nvram.h to the files that use them or just outright remove completely unused stuff. We leave the partition signatures definitions, they will be useful Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| * powerpc: Use call_rcu_sched() for pagetablesPeter Zijlstra2010-11-301-1/+1
| | | | | | | | | | | | | | | | PowerPC relies on IRQ-disable to guard against RCU quiecent states, use the appropriate RCU call version. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc: Remove second definition of STACK_FRAME_OVERHEADStephen Rothwell2010-11-2914-1/+13
| | | | | | | | | | | | | | | | | | Since STACK_FRAME_OVERHEAD is defined in asm/ptrace.h and that is ASSEMBER safe, we can just include that instead of going via asm-offsets.h. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/mm: Avoid avoidable void* pointerMichael Neuling2010-11-291-1/+1
| | | | | | | | | | | | | | | | Change pgdir from a void to real type. Having this as a void is stupid and has already caused 1 bug. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc: Add POWER7+ cputable entryMichael Neuling2010-11-291-0/+16
| | | | | | | | | | | | | | | | This adds the POWER7+ cputable entry for the PVR 0x004a0000. Rest is the same as vanilla POWER7. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc: Remove POWER6 oprofile workarounds for POWER7Michael Neuling2010-11-291-4/+0
| | | | | | | | | | | | | | These are not needed on POWER7 so remove them. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc: Remove unneeded cpu_setup/restore from POWER7 cputable entryMichael Neuling2010-11-292-7/+0
| | | | | | | | | | | | | | These are not needed so just remove them Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc: Add VPHN firmware featureJesse Larrew2010-11-293-1/+4
| | | | | | | | | | | | | | | | This simple patch adds the firmware feature for VPHN to the firmware features bitmask. Signed-off-by: Jesse Larrew <jlarrew@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc: Consolidate obj-y assignmentsMichael Ellerman2010-11-291-5/+4
| | | | | | | | | | | | | | No need to have three of them. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/iseries: Remove unused mf_getSrcHistory function and caller.Jesper Juhl2010-11-291-62/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On Tue, 2 Nov 2010, Michael Ellerman wrote: > On Mon, 2010-11-01 at 22:20 +0100, Jesper Juhl wrote: > > Hi Stephen, > > > > On Tue, 2 Nov 2010, Stephen Rothwell wrote: > > > > > On Mon, 1 Nov 2010 21:06:23 +0100 (CET) Jesper Juhl <jj@chaosbits.net> wrote: > > > > > > > > Remove unused function 'mf_getSrcHistory' (that will never be used ever > > > > according to Stephen Rothwell). > > > > > > > > Signed-off-by: Jesper Juhl <jj@chaosbits.net> > > > > > > Acked-by: Stephen Rothwell <sfr@canb.auug.org.au> > > > > > > > Ok, so if you are the (unofficial) iSeries maintainer and you don't merge > > the patch somewhere that'll eventually go up-stream, but just ACK it > > (thank you for that btw), then where do I send it to get it merged? > > Here. ie. linuxppc-dev. > > But, while you're removing it you should remove the #if 0'ed callsite as > well, see mf_src_proc_show() in that file. :) > Done. See patch below. Remove unused function 'mf_getSrcHistory' (that will never be used ever according to Stephen Rothwell) and also remove most of (under 'if 0') code from mf_src_proc_show() where the function was called. Signed-off-by: Jesper Juhl <jj@chaosbits.net> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/cell: Use vzalloc rather than vmalloc and memset in spu_alloc_lscsa_stdJesper Juhl2010-11-291-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Hi, We can get rid of a memset in arch/powerpc/platforms/cell/spufs/lscsa_alloc.c::spu_alloc_lscsa_std() by using vzalloc() rather than vmalloc()+memset(). Completely untested patch below since I have no hardware nor tools to compile this. Signed-off-by: Jesper Juhl <jj@chaosbits.net> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc: Add memory_hotplug_max()Nishanth Aravamudan2010-11-292-0/+31
| | | | | | | | | | | | | | | | | | | | Add a function to get the maximum address that can be hotplug added. This is needed to calculate the size of the tce table needed to cover all memory in 1:1 mode. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/macio: Ensure all dma routines get copied overNishanth Aravamudan2010-11-292-4/+9
| | | | | | | | | | | | | | | | | | Also add a comment to dev_archdata, indicating that changes there need to be verified against the driver code. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/pseries: iommu cleanupNishanth Aravamudan2010-11-291-7/+2
| | | | | | | | | | | | | | | | | | | | | | | | No need to initialize per-cpu pointer to NULL, it is the default. Direct dma ops and no setup are the defaults, no need to set for iommu-off. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Reviewed-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/dart: iommu table cleanupNishanth Aravamudan2010-11-291-8/+1
| | | | | | | | | | | | | | | | | | No need to set the device tree device_node pci node iommu pointer, its only used for dlpar remove. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/cell: Beat dma ops cleanupNishanth Aravamudan2010-11-291-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | direct_dma_ops is the default pci dma ops. No need to call a function to get the pci dma ops, we know they are the dma_direct_ops. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/pasemi: Clean up pasemi iommu table initializationsNishanth Aravamudan2010-11-291-18/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | No need for empty helpers with iommu off, the ppc_md hooks are optional. The direct_dma_ops are the default pci_dma_ops, so no need to set in the them iommu off case. No need to set the device tree device_node pci node iommu pointer, its only used for dlpar remove. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Acked-by: Olof Johansson <olof@lixom.net> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/vio: Use dma ops helpersNishanth Aravamudan2010-11-291-3/+8
| | | | | | | | | | | | | | | | | | Use the set_dma_ops helper. Instead of modifying vio_dma_mapping_ops, just create a trivial wrapper for dma_supported. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc/ps3: Replace the use of <module>-objs with <module>-yTracey Dent2010-11-291-1/+1
| | | | | | | | | | | | | | Changed <module>-objs to <module>-y in Makefile. Signed-off-by: Tracey Dent <tdent48227@gmail.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | rtc-cmos.c : Fix warning on PowerPCSrikanth Krishnakar2010-11-291-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | The following warning is seen while compilation of PowerPC kernel: CC drivers/rtc/rtc-cmos.o drivers/rtc/rtc-cmos.c:697:2: warning: #warning Assuming 128 bytes of RTC+NVRAM address space, not 64 bytes. Fix it by adding defined(__powerpc__). Signed-off-by: Srikanth Krishnakar <skrishna@mvista.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc: Add support for new hcall H_BEST_ENERGYVaidyanathan Srinivasan2010-11-294-1/+339
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Create sysfs interface to export data from H_BEST_ENERGY hcall that can be used by administrative tools on supported pseries platforms for energy management optimizations. sys/device/system/cpu/pseries_(de)activate_hint_list and sys/device/system/cpu/cpuN/pseries_(de)activate_hint will provide hints for activation and deactivation of cpus respectively. These hints are abstract number given by the hypervisor based on the extended knowledge the hypervisor has regarding the system topology and resource mappings. The activate and the deactivate sysfs entry is for the two distinct operations that we could do for energy savings. When we have more capacity than required, we could deactivate few core to save energy. The choice of the core to deactivate will be based on /sys/devices/system/cpu/deactivate_hint_list. The comma separated list of cpus (cores) will be the preferred choice. If we have to activate some of the deactivated cores, then /sys/devices/system/cpu/activate_hint_list will be used. The per-cpu file /sys/device/system/cpu/cpuN/pseries_(de)activate_hint further provide more fine grain information by exporting the value of the hint itself. Added new driver module arch/powerpc/platforms/pseries/pseries_energy.c under new config option CONFIG_PSERIES_ENERGY Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* | powerpc: Cleanup APIs for cpu/thread/core mappingsVaidyanathan Srinivasan2010-11-293-15/+31
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | These APIs take logical cpu number as input Change cpu_first_thread_in_core() to cpu_first_thread_sibling() Change cpu_last_thread_in_core() to cpu_last_thread_sibling() These APIs convert core number (index) to logical cpu/thread numbers Add cpu_first_thread_of_core(int core) Changed cpu_thread_to_core() to cpu_core_index_of_thread(int cpu) The goal is to make 'threads_per_core' accessible to the pseries_energy module. Instead of making an API to read threads_per_core, this is a higher level wrapper function to convert from logical cpu number to core number. The current APIs cpu_first_thread_in_core() and cpu_last_thread_in_core() returns logical CPU number while cpu_thread_to_core() returns core number or index which is not a logical CPU number. The new APIs are now clearly named to distinguish 'core number' versus first and last 'logical cpu number' in that core. The new APIs cpu_{first,last}_thread_sibling() work on logical cpu numbers. While cpu_first_thread_of_core() and cpu_core_index_of_thread() work on core index. Example usage: (4 threads per core system) cpu_first_thread_sibling(5) = 4 cpu_last_thread_sibling(5) = 7 cpu_core_index_of_thread(5) = 1 cpu_first_thread_of_core(1) = 4 cpu_core_index_of_thread() is used in cpu_to_drc_index() in the module and cpu_first_thread_of_core() is used in drc_index_to_cpu() in the module. Make API changes to few callers. Export symbols for use in modules. Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
generated by cgit v1.1 at 2024-10-28 20:26:15 +0000