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* [POWERPC] Use 1TB segmentsPaul Mackerras2007-10-12
| | | | | | | | | | | | | | | | | | | | This makes the kernel use 1TB segments for all kernel mappings and for user addresses of 1TB and above, on machines which support them (currently POWER5+, POWER6 and PA6T). We detect that the machine supports 1TB segments by looking at the ibm,processor-segment-sizes property in the device tree. We don't currently use 1TB segments for user addresses < 1T, since that would effectively prevent 32-bit processes from using huge pages unless we also had a way to revert to using 256MB segments. That would be possible but would involve extra complications (such as keeping track of which segment size was used when HPTEs were inserted) and is not addressed here. Parts of this patch were originally written by Ben Herrenschmidt. Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] spufs: Fix restore_decr_wrapped() to match CBE HandbookJeremy Kerr2007-09-19
| | | | | | | | | | | | Based on an original patch from Masato Noguchi <Masato.Noguchi@jp.sony.com>. We're currently not restoring the SPE decrementer as specified by the CBE handbook. This change fixes our implementation to match, and makes the function read more like the docs. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] spufs: Remove spu_harvestJeremy Kerr2007-09-19
| | | | | | | | | | Based on an initial patch from Sebastian Siewior <sebastian@breakpoint.cc> spu_harvest isn't used, remove it. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [CELL] spufs: dont halt decrementer at restore step 47Masato Noguchi2007-07-20
| | | | | | | | | No need to halt the SPE decrementer at context restore step 47, it will be done in step 7. Signed-off-by: Masato Noguchi <Masato.Noguchi@jp.sony.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
* [CELL] spufs: limit saving MFC_CNTL bitsMasato Noguchi2007-07-20
| | | | | | | | | At save step 8, the mfc control register in the CSA should be written _only_ with Sc and Sm bits (at least MFC_CNTL[Dh] should be set to 0) Signed-off-by: Masato Noguchi <Masato.Noguchi@jp.sony.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
* [CELL] spufs: fix decr_status meaningsMasato Noguchi2007-07-20
| | | | | | | | | | | | | | The decr_status in the LSCSA is confusedly used as two meanings: * SPU decrementer was running * SPU decrementer was wrapped as a result of adjust and the code to set decr_status is missing. This patch fixes these problems by using the decr_status argument as a set of flags. This requires a rebuild of the shipped spu_restore code. Signed-off-by: Masato Noguchi <Masato.Noguchi@jp.sony.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
* [CELL] spufs: remove needless context save/restore codeMasato Noguchi2007-07-20
| | | | | | | | | | | | | | | | | | The following steps are not needed in the SPE context save/restore paths: Save Step 12: save_mfc_decr() save suspend_time to CSA (It will be done by step 14) save ch 7 (decrementer value will be saved in LSCSA by spe-side step 10) Restore Step 59: restore_ch_part1() restore ch 1 (it will be done by spe-side step 15) This change removes the unnecessary steps. Signed-off-by: Masato Noguchi <Masato.Noguchi@jp.sony.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
* [CELL] spufs: fix array size of channel indexJeremy Kerr2007-07-20
| | | | | | | | | | Based on a fix from Masato Noguchi <Masato.Noguchi@jp.sony.com>. Remove the (incorrect) array size declarations in the spufs channel arrays, and use ARRAY_SIZE rather than hardcoded values. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
* [CELL] spufs: Avoid unexpectedly restaring MFC during context saveKazunori Asayama2007-07-20
| | | | | | | | | | | The current SPU context saving procedure in SPUFS unexpectedly restarts MFC when halting decrementer, because MFC_CNTL[Dh] is set without MFC_CNTL[Sm]. This bug causes, for example, saving broken DMA queues. Here is a patch to fix the problem. Signed-off-by: Kazunori Asayama <asayama@sm.sony.co.jp> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
* [POWERPC] spufs: Save dma_tagstatus_R in CSAKazunori Asayama2007-07-03
| | | | | | | | | | The function backing_ops->read_mfc_tagstatus() doesn't return a correct value because the dma_tagstatus_R register isn't saved in CSA. This fixes the problem. Signed-off-by: Kazunori Asayama <asayama@sm.sony.co.jp> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] spufs: Trivial whitespace fixesJeremy Kerr2007-07-03
| | | | | | | Remove redundant whitespace in arch/powerpc/platforms/cell/spufs/ Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] Spufs support for 64K LS mappings on 4K kernelsBenjamin Herrenschmidt2007-05-09
| | | | | | | | | | | | This adds an option to spufs when the kernel is configured for 4K page to give it the ability to use 64K pages for SPE local store mappings. Currently, we are optimistic and try order 4 allocations when creating contexts. If that fails, the code will fallback to 4K automatically. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* header cleaning: don't include smp_lock.h when not usedRandy Dunlap2007-05-08
| | | | | | | | | | | | Remove includes of <linux/smp_lock.h> where it is not used/needed. Suggested by Al Viro. Builds cleanly on x86_64, i386, alpha, ia64, powerpc, sparc, sparc64, and arm (all 59 defconfigs). Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [POWERPC] spufs: make spu page faults not block schedulingArnd Bergmann2007-04-23
| | | | | | | | | | | | | | | | | | | | | | Until now, we have always entered the spu page fault handler with a mutex for the spu context held. This has multiple bad side-effects: - it becomes impossible to suspend the context during page faults - if an spu program attempts to access its own mmio areas through DMA, we get an immediate livelock when the nopage function tries to acquire the same mutex This patch makes the page fault logic operate on a struct spu_context instead of a struct spu, and moves it from spu_base.c to a new file fault.c inside of spufs. We now also need to copy the dar and dsisr contents of the last fault into the saved context to have it accessible in case we schedule out the context before activating the page fault handler. Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
* [POWERPC] Fix spu SLB invalidationsBenjamin Herrenschmidt2007-03-09
| | | | | | | | | | | | | | | | | The SPU code doesn't properly invalidate SPUs SLBs when necessary, for example when changing a segment size from the hugetlbfs code. In addition, it saves and restores the SLB content on context switches which makes it harder to properly handle those invalidations. This patch removes the saving & restoring for now, something more efficient might be found later on. It also adds a spu_flush_all_slbs(mm) that can be used by the core mm code to flush the SLBs of all SPEs that are running a given mm at the time of the flush. In order to do that, it adds a spinlock to the list of all SPEs and move some bits & pieces from spufs to spu_base.c Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* [POWERPC] spufs: "stautus" isnt a word.arnd@arndb.de2006-10-25
| | | | | | Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] spufs: add support for nonschedulable contextsMark Nutter2006-10-25
| | | | | | | | | | | | | | | | This adds two new flags to spu_create: SPU_CREATE_NONSCHED: create a context that is never moved away from an SPE once it has started running. This flag can only be used by tasks with the CAP_SYS_NICE capability. SPU_CREATE_ISOLATED: create a nonschedulable context that enters isolation mode upon first run. This requires the SPU_CREATE_NONSCHED flag. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] spufs: wrap mfc sdr accessMasato Noguchi2006-10-25
| | | | | | | | | | | | | | | | | | | SPRN_SDR1 and the SPE's MFC SDR are hypervisor resources and are not accessible from a logical partition. This change adds an access wrapper. When running on bare H/W, the spufs needs to only set the SPE's MFC SDR to the value of the PPE's SPRN_SDR1 once at SPE initialization, so this change renames mfc_sdr_set() to mfc_sdr_setup() and moves the access of SPRN_SDR1 into the mmio wrapper. It also removes the now unneeded member mfc_sdr_RW from struct spu_priv1_collapsed. Signed-off-by: Masato Noguchi <Masato.Noguchi@jp.sony.com> Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> -- Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] spufs: fix context switch during page faultHyeonSeung Jang2006-10-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | For better explanation, I break down the page fault handling into steps: 1) There is a page fault caused by DMA operation initiated by SPU and DMA is suspended. 2) The interrupt handler 'spu_irq_class_1()/__spu_trap_data_map()' is called and it just wakes up the sleeping spe-manager thread. 3) by PPE scheduler, the corresponding bottom half, spu_irq_class_1_bottom() is called in process context and DMA is restarted. There can be a quite large time gap between 2) and 3) and I found the following problem: Between 2) and 3) If the context becomes unbound, 3) is not executed because when the spe-manager thread is awaken, the context is already saved. (This situation can happen, for example, when a high priority spe thread newly started in that time gap) But the actual problem is that the corresponding SPU context does not work even if it is bound again to a SPU. Besides I can see the following warning in mambo simulator when the context becomes unbound(in save_mfc_cmd()), i.e. when unbind() is called for the context after step 2) before 3) : 'WARNING: 61392752237: SPE2: MFC_CMD_QUEUE channel count of 15 is inconsistent with number of available DMA queue entries of 16' After I go through available documents, I found that the problem is because the suspended DMA is not restarted when it is bound again. Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* Remove obsolete #include <linux/config.h>Jörn Engel2006-06-30
| | | | | Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpcLinus Torvalds2006-06-29
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: (43 commits) [POWERPC] Use little-endian bit from firmware ibm,pa-features property [POWERPC] Make sure smp_processor_id works very early in boot [POWERPC] U4 DART improvements [POWERPC] todc: add support for Time-Of-Day-Clock [POWERPC] Make lparcfg.c work when both iseries and pseries are selected [POWERPC] Fix idr locking in init_new_context [POWERPC] mpc7448hpc2 (taiga) board config file [POWERPC] Add tsi108 pci and platform device data register function [POWERPC] Add general support for mpc7448hpc2 (Taiga) platform [POWERPC] Correct the MAX_CONTEXT definition powerpc: minor cleanups for mpc86xx [POWERPC] Make sure we select CONFIG_NEW_LEDS if ADB_PMU_LED is set [POWERPC] Simplify the code defining the 64-bit CPU features [POWERPC] powerpc: kconfig warning fix [POWERPC] Consolidate some of kernel/misc*.S [POWERPC] Remove unused function call_with_mmu_off [POWERPC] update asm-powerpc/time.h [POWERPC] Clean up it_lp_queue.h [POWERPC] Skip the "copy down" of the kernel if it is already at zero. [POWERPC] Add the use of the firmware soft-reset-nmi to kdump. ...
| * [POWERPC] spufs: fix MFC command queue purgeBenjamin Herrenschmidt2006-06-27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In the context save/restore code, the SPU MFC command queue purge code has a bug: static inline void wait_purge_complete(struct spu_state *csa, struct spu *spu) { struct spu_priv2 __iomem *priv2 = spu->priv2; /* Save, Step 28: * Poll MFC_CNTL[Ps] until value '11' is * read * (purge complete). */ POLL_WHILE_FALSE(in_be64(&priv2->mfc_control_RW) & MFC_CNTL_PURGE_DMA_COMPLETE); } This will exit as soon as _one_ of the 2 bits that compose MFC_CNTL_PURGE_DMA_COMPLETE is set, and one of them happens to be "purge in progress"... which means that we'll happily continue restoring the MFC while it's being purged at the same time. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* | [PATCH] spin/rwlock init cleanupsIngo Molnar2006-06-27
|/ | | | | | | | | | | | | | | | | | | | | locking init cleanups: - convert " = SPIN_LOCK_UNLOCKED" to spin_lock_init() or DEFINE_SPINLOCK() - convert rwlocks in a similar manner this patch was generated automatically. Motivation: - cleanliness - lockdep needs control of lock initialization, which the open-coded variants do not give - it's also useful for -rt and for lock debugging in general Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* spelling fixesAndreas Mohr2006-06-26
| | | | | | | | | | | | acquired (aquired) contiguous (contigious) successful (succesful, succesfull) surprise (suprise) whether (weather) some other misspellings Signed-off-by: Andreas Mohr <andi@lisas.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
* [POWERPC] spufs: remove stop_code from struct spuMasato Noguchi2006-06-21
| | | | | | | | | | This patch remove 'stop_code' -- discarded member of struct spu. It is written at initialize and interrupt, but never read in current implementation. Signed-off-by: Masato Noguchi <Masato.Noguchi@jp.sony.com> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] spufs: further abstract priv1 register accessGeoff Levand2006-06-21
| | | | | | | | | | | | | | | To support muti-platform binaries the spu hypervisor accessor routines must have runtime binding. I removed the existing statically linked routines in spu.h and spu_priv1_mmio.c and created new accessor routines in spu_priv1.h that operate indirectly through an ops struct spu_priv1_ops. spu_priv1_mmio.c contains the instance of the accessor routines for running on raw hardware. Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] spufs: dont try to access SPE channel 1 countarnd@arndb.de2006-06-21
| | | | | | | | | | | | | | | The save/restore sequence for SPE contexts currently attempts to save and restore the channel count for SPE channel 1 (the SPU_WriteEventMask channel. But the CBE architecture (section 9.11.2) clearly states that this channel does not have an associated count. Hardware simply ignores the attempt to write this count, but the simulator generates a warning message. WARNING: 279721590: SPE7: Attempt to write channel count for CH 1 with no associated count is ignored. Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] spufs: fix initial state of wbox filearnd@arndb.de2006-06-21
| | | | | | | | | | The wbox channel count of an spu is now initialized to four for the saved context. This makes it possible to write to the mailbox right away without waiting for the SPE to become scheduled first. Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] spufs: set up correct SLB entries for 64k pagesarnd@arndb.de2006-06-21
| | | | | | | | | spufs currently knows only 4k pages and 16M hugetlb pages. Make it use the regular methods for deciding on the SLB bits. Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] cell: always build spu base into the kernelarnd@arndb.de2006-06-21
| | | | | | | | | | The spu_base module is rather deeply intermixed with the core kernel, so it makes sense to have that built-in. This will let us extend the base in the future without having to export more core symbols just for it. Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: fix context-switch decrementer codeJordi Caubet2006-04-13
| | | | | | | | | | | | | | We found that when the 'decrementer' is saved, the PPE saves the current time 'csa->suspend_time'. When restoring the 'decrementer', (Step 34) decrementer seems to be adjusted with the number of cycles th= at a spu thread has not been running. In that code it is missing a substract ('-') because 'delta_time' is assigned a not substracted(see bellow). Acked-by: Mark Nutter <mnutter@us.ibm.com> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: implement mfc access for PPE-side DMAArnd Bergmann2006-03-26
| | | | | | | | | | | | | | | | | | | | | | | | This patch adds a new file called 'mfc' to each spufs directory. The file accepts DMA commands that are a subset of what would be legal DMA commands for problem state register access. Upon reading the file, a bitmask is returned with the completed tag groups set. The file is meant to be used from an abstraction in libspe that is added by a different patch. From the kernel perspective, this means a process can now offload a memory copy from or into an SPE local store without having to run code on the SPE itself. The transfer will only be performed while the SPE is owned by one thread that is waiting in the spu_run system call and the data will be transferred into that thread's address space, independent of which thread started the transfer. Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: Suspend/restore MFC DMA operations at SPU context switch.Geoff Levand2006-01-10
| | | | | | | | | | | | | The SPE Book IV indicates that MFC DMA operations must be suspended and restored on SPU context switch (in Step 8). This patch adds that operation, which is missing from the current spufs implementation. Signed-off-by: Masato Noguchi <Masato.Noguchi@jp.sony.com> Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com> Acked-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: abstract priv1 register access.Arnd Bergmann2006-01-08
| | | | | | | | | | | | | | | | | | In a hypervisor based setup, direct access to the first priviledged register space can typically not be allowed to the kernel and has to be implemented through hypervisor calls. As suggested by Masato Noguchi, let's abstract the register access trough a number of function calls. Since there is currently no public specification of actual hypervisor calls to implement this, I only provide a place that makes it easier to hook into. Cc: Masato Noguchi <Masato.Noguchi@jp.sony.com> Cc: Geoff Levand <geoff.levand@am.sony.com> Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: clean up use of bitopsArnd Bergmann2006-01-08
| | | | | | | | | | checking bits manually might not be synchonized with the use of set_bit/clear_bit. Make sure we always use the correct bitops by removing the unnecessary identifiers. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: fix mailbox pollingArnd Bergmann2006-01-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | Handling mailbox interrupts was broken in multiple respects, the combination of which was hiding the bugs most of the time. - The ibox interrupt mask was open initially even though there are no waiters on a newly created SPU. - Acknowledging the mailbox interrupt did not work because it is level triggered and the mailbox data is never retrieved from inside the interrupt handler. - The interrupt handler delivered interrupts with a disabled mask if another interrupt is triggered for the same class but a different mask. - The poll function did not enable the interrupt if it had not been enabled, so we might run into the poll timeout if none of the other bugs saved us and no signal was delivered. We probably still have a similar problem with blocking read/write on mailbox files, but that will result in extra wakeup in the worst case, not in incorrect behaviour. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: cooperative scheduler supportArnd Bergmann2006-01-08
| | | | | | | | | | | | | | | | | | | | | | | | This adds a scheduler for SPUs to make it possible to use more logical SPUs than physical ones are present in the system. Currently, there is no support for preempting a running SPU thread, they have to leave the SPU by either triggering an event on the SPU that causes it to return to the owning thread or by sending a signal to it. This patch also adds operations that enable accessing an SPU in either runnable or saved state. We use an RW semaphore to protect the state of the SPU from changing underneath us, while we are holding it readable. In order to change the state, it is acquired writeable and a context save or restore is executed before downgrading the semaphore to read-only. From: Mark Nutter <mnutter@us.ibm.com>, Uli Weigand <Ulrich.Weigand@de.ibm.com> Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] kernel-side context switch code for spufsMark Nutter2006-01-08
| | | | | | | | This adds the code needed to perform a context switch from spufs, following the recommended 76-step sequence. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: switchable spu contextsMark Nutter2006-01-08
Add some infrastructure for saving and restoring the context of an SPE. This patch creates a new structure that can hold the whole state of a physical SPE in memory. It also contains code that avoids races during the context switch and the binary code that is loaded to the SPU in order to access its registers. The actual PPE- and SPE-side context switch code are two separate patches. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
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