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* [PATCH] 2/5 powerpc: Rework PowerMac i2c part 2Benjamin Herrenschmidt2006-01-092-89/+247
| | | | | | | | | | | | | | | | | | This is the continuation of the previous patch. This one removes the old PowerMac i2c drivers (i2c-keywest and i2c-pmac-smu) and replaces them both with a single stub driver that uses the new PowerMac low i2c layer. Now that i2c-keywest is gone, the low-i2c code is extended to support interrupt driver transfers. All i2c busses now appear as platform devices. Compatibility with existing drivers should be maintained as the i2c bus names have been kept identical, except for the SMU bus but in that later case, all users has been fixed. With that patch added, matching a device node to an i2c_adapter becomes trivial. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] 1/5 powerpc: Rework PowerMac i2c part 1Benjamin Herrenschmidt2006-01-094-348/+730
| | | | | | | | | | | | | | | This is the first part of a rework of the PowerMac i2c code. It completely reworks the "low_i2c" layer. It is now more flexible, supports KeyWest, SMU and PMU i2c busses, and provides functions to match device nodes to i2c busses and adapters. This patch also extends & fix some bugs in the SMU driver related to i2c support and removes the clock spreading hacks from the pmac feature code rather than adapting them to the new API since they'll be replaced by the platform function code completely in patch 3/5 Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64: fix time syscallAnton Blanchard2006-01-092-29/+1
| | | | | | | | | | | | ppc64 has its own version of sys_time. It looks pretty scary, touching a whole bunch of variables without any locking or memory ordering. In fact, a recent bugreport has shown it can actually go backwards. Time to remove it and just use the generic sys_time, which is implemented on top of do_gettimeofday. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc32: Put cache flush routines back into .relocate_code sectionPaul Janzen2006-01-091-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In 2.6.14, we had the following definition of _GLOBAL() in include/asm-ppc/processor.h: #define _GLOBAL(n)\ .stabs __stringify(n:F-1),N_FUN,0,0,n;\ .globl n;\ n: In 2.6.15, as part of the great powerpc merge, we moved this definition to include/asm-powerpc/ppc_asm.h, where it appears (to 32-bit code) as: #define _GLOBAL(n) \ .text; \ .stabs __stringify(n:F-1),N_FUN,0,0,n;\ .globl n; \ n: Mostly, this is fine. However, we also have the following, in arch/ppc/boot/common/util.S: .section ".relocate_code","xa" [...] _GLOBAL(flush_instruction_cache) [...] _GLOBAL(flush_data_cache) [...] The addition of the .text section definition in the definition of _GLOBAL overrides the .relocate_code section definition. As a result, these two functions don't end up in .relocate_code, so they don't get relocated correctly, and the boot fails. There's another suspicious-looking usage at kernel/swsusp.S:37 that someone should look into. I did not exhaustively search the source tree, though. The following is the minimal patch that fixes the immediate problem. I could easily be convinced that the _GLOBAL definition should be modified to remove the ".text;" line either instead of, or in addition to, this fix. Signed-off-by: Paul Janzen <pcj@linux.sez.to> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: set irq affinity for running threadsArnd Bergmann2006-01-094-16/+40
| | | | | | | | | | | | | | For far, all SPU triggered interrupts always end up on the first SMT thread, which is a bad solution. This patch implements setting the affinity to the CPU that was running last when entering execution on an SPU. This should result in a significant reduction in IPI calls and better cache locality for SPE thread specific data. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: fix sparse warningsArnd Bergmann2006-01-094-6/+5
| | | | | | | | | One local variable is missing an __iomem modifier, in another place, we pass a completely unused argument with a missing __user modifier. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: abstract priv1 register access.Arnd Bergmann2006-01-095-129/+208
| | | | | | | | | | | | | | | | | | 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: move spu_run call to its own fileArnd Bergmann2006-01-094-153/+160
| | | | | | | | | | | | The logic for sys_spu_run keeps growing and it does not really belong into file.c any more since we moved away from using regular file operations to our own syscall. No functional change in here. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: clean up use of bitopsArnd Bergmann2006-01-094-13/+12
| | | | | | | | | | 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 spufs_fill_dir error pathArnd Bergmann2006-01-091-35/+38
| | | | | | | | | | | If creating one entry failed in spufs_fill_dir, we never cleaned up the freshly created entries. Fix this by calling the cleanup function on error. Noticed by Al Viro. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: dont leak directories in failed spu_createArnd Bergmann2006-01-091-17/+37
| | | | | | | | | | | If get_unused_fd failed in sys_spu_create, we never cleaned up the created directory. Fix that by restructuring the error path. Noticed by Al Viro. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs fix spu_acquire_runnable error pathArnd Bergmann2006-01-091-2/+2
| | | | | | | | | When spu_activate fails in spu_acquire_runnable, the state must still be SPU_STATE_SAVED, we were incorrectly setting it to SPU_STATE_RUNNABLE. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: serialize sys_spu_run per spuArnd Bergmann2006-01-093-5/+12
| | | | | | | | | | | | During an earlier cleanup, we lost the serialization of multiple spu_run calls performed on the same spu_context. In order to get this back, introduce a mutex in the spu_context that is held inside of spu_run. Noticed by Al Viro. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: check for proper file pointer in sys_spu_runArnd Bergmann2006-01-093-3/+5
| | | | | | | | | | | | | Only checking for SPUFS_MAGIC is not reliable, because it might not be unique in theory. Worse than that, we accidentally allow spu_run to be performed on any file in spufs, not just those returned from spu_create as intended. Noticed by Al Viro. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: dont hold root->isem in spu_forgetArnd Bergmann2006-01-091-10/+10
| | | | | | | | | | | | spu_forget will do mmput on the DMA address space, which can lead to lots of other stuff getting triggered. We better not hold a semaphore here that we might need in the process. Noticed by Al Viro. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: fix locking in spu_acquire_runnableArnd Bergmann2006-01-091-4/+6
| | | | | | | | | | We need to check for validity of owner under down_write, down_read is not enough. Noticed by Al Viro. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] cell: enable pause(0) in cpu_idleArnd Bergmann2006-01-099-7/+314
| | | | | | | | | | | | This patch enables support for pause(0) power management state for the Cell Broadband Processor, which is import for power efficient operation. The pervasive infrastructure will in the future enable us to introduce more functionality specific to the Cell's pervasive unit. From: Maximino Aguilar <maguilar@us.ibm.com> Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: fixing compile issue with !CONFIG_PCI in legacy_serial.cKumar Gala2006-01-091-1/+11
| | | | | | | | | Only build in support for ISA and PCI cases if we have enabled CONFIG_ISA and CONFIG_PCI. Additionally, isa_bridge is a global so we shouldn't use it a parameter name since it gets redefined to NULL when !CONFIG_PCI. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Fix search for the main interrupt controllerHaren Myneni2006-01-091-6/+9
| | | | | | | | | | At present, we are not looking at all interrupt controller nodes in the device tree even though the proper node was not found. This is causing the system panic. The attached patch will scan all nodes until it finds the proper interrupt controller type. Signed-off-by: Haren Myneni <haren@us.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Call find_legacy_serial_ports() if we enable CONFIG_SERIAL_8250Kumar Gala2006-01-093-4/+3
| | | | | | | | In setup_arch and setup_system call find_legacy_serial_ports() if we build in support for 8250 serial ports instead of basing it on PPC_MULTIPLATFORM. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: added a udbg_progressKumar Gala2006-01-092-7/+7
| | | | | | | Added a common udbg_progress for use by ppc_md.progress() Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Add the ability to handle SOC ports in legacy_serialKumar Gala2006-01-091-10/+52
| | | | | | | | | Add the ability to configure and initialize legacy 8250 serials ports on an SOC bus. Also, fixed an issue that we would not configure any serial ports if "linux,stdout-path" was not found. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Loosen udbg_probe_uart_speed sanity checkingKumar Gala2006-01-091-1/+1
| | | | | | | | | The checking of the baudrate in udbg_probe_uart_speed was too tight and would cause reporting back of the default baud rate in cases where the computed speed was valid. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: don't add memory to empty node/zoneMike Kravetz2006-01-091-5/+14
| | | | | | | | | | | The system will oops if an attempt is made to add memory to an empty node/zone. This patch prevents adding memory to an empty node. The code to dynamically add a node/zone is non-trivial. This patch is temporary and will be removed when the ability to dynamically add a node/zone is complete. Signed-off-by: Mike Kravetz <kravetz@us.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: fix two build warningsArnd Bergmann2006-01-092-2/+1
| | | | | | | | | | | | | | | Building the arch/powerpc tree currently gives me two warnings with gcc-4.0: arch/powerpc/mm/imalloc.c: In function '__im_get_area': arch/powerpc/mm/imalloc.c:225: warning: 'tmp' may be used uninitialized in this function arch/powerpc/mm/hugetlbpage.c: In function 'hugetlb_get_unmapped_area': arch/powerpc/mm/hugetlbpage.c:608: warning: unused variable 'vma' both fixes are trivial. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Fix iSeries bug in VMALLOCBASE/VMALLOC_START consolidationDavid Gibson2006-01-091-1/+1
| | | | | | | | | | | | Oops, forgot to compile the VMALLOCBASE/VMALLOC_START patch on iSeries. VMALLOC_START is defined in pgtable.h whereas previously VMALLOCBASE was previously defined in page.h. lparmap.c needs to be updated appropriately. Booted on iSeries RS64 (now). Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: G4+ oprofile supportAndy Fleming2006-01-097-68/+293
| | | | | | | | | | | | | | | This patch adds oprofile support for the 7450 and all its multitudinous derivatives. * Added 7450 (and derivatives) support for oprofile * Changed e500 cputable to have oprofile model and cpu_type fields * Added support for classic 32-bit performance monitor interrupt * Cleaned up common powerpc oprofile code to be as common as possible * Cleaned up oprofile_impl.h to reflect 32 bit classic code * Added 32-bit MMCRx bitfield definitions and SPR numbers Signed-off-by: Andy Fleming <afleming@freescale.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Fix compile problem in pci.c for ppc32Kumar Gala2006-01-091-1/+1
| | | | | | | pci_address_to_pio is missing a closing curly brace Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: pci_address_to_pio fixBenjamin Herrenschmidt2006-01-093-11/+14
| | | | | | | | | This fixes pci_address_to_pio() to return an unsigned long (to be safe) and fixes a bug in the implementation that caused it to return a bogus IO port number Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Replace VMALLOCBASE with VMALLOC_STARTDavid Gibson2006-01-092-5/+5
| | | | | | | | | | | | | | | | | | | | | | | On ppc64, we independently define VMALLOCBASE and VMALLOC_START to be the same thing: the start of the vmalloc() area at 0xd000000000000000. VMALLOC_START is used much more widely, including in generic code, so this patch gets rid of the extraneous VMALLOCBASE. This does require moving the definitions of region IDs from page_64.h to pgtable.h, but they don't clearly belong in the former rather than the latter, anyway. While we're moving them, clean up the definitions of the REGION_IDs: - Abolish REGION_SIZE, it was only used once, to define REGION_MASK anyway - Define the specific region ids in terms of the REGION_ID() macro. - Define KERNEL_REGION_ID in terms of PAGE_OFFSET rather than KERNELBASE. It amounts to the same thing, but conceptually this is about the region of the linear mapping (which starts at PAGE_OFFSET) rather than of the kernel text itself (which is at KERNELBASE). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Fix g5 DART initBenjamin Herrenschmidt2006-01-091-2/+2
| | | | | | | | | The patch enabling the new G5's with U4 broke initialization of the DART driver, causing it to trigger a BUG_ON for a case that is actually valid. This patch fixes it: Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Experimental support for new G5 Macs (#2)Benjamin Herrenschmidt2006-01-0914-371/+791
| | | | | | | | | | | | | This adds some very basic support for the new machines, including the Quad G5 (tested), and other new dual core based machines and iMac G5 iSight (untested). This is still experimental ! There is no thermal control yet, there is no proper handing of MSIs, etc.. but it boots, I have all 4 cores up on my machine. Compared to the previous version of this patch, this one adds DART IOMMU support for the U4 chipset and thus should work fine on setups with more than 2Gb of RAM. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Detect prefetchable windows in pci_process_bridge_OF_rangesKumar Gala2006-01-091-1/+7
| | | | | | | | Added the ability to determine if an outbound window in the PCI host controller is for prefetchable memory and report it as such. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: export PCI fixup routinelinas2006-01-091-1/+1
| | | | | | | | | There is code in the RPAPHP directory that is identical to this routine; I'll be removing that code in an upcoming patch, but this patch is needed to expose the function to make it callable. Signed-off-by: Linas Vepstas <linas@austin.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Update MPIC workaroundsSegher Boessenkool2006-01-091-48/+36
| | | | | | | | | Cleanup the MPIC IO-APIC workarounds, make them a bit more generic, smaller and faster. Signed-off-by: Segher Boessenkool <segher@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Remove device_node addrs/n_addrBenjamin Herrenschmidt2006-01-0913-771/+431
| | | | | | | | | | | | The pre-parsed addrs/n_addrs fields in struct device_node are finally gone. Remove the dodgy heuristics that did that parsing at boot and remove the fields themselves since we now have a good replacement with the new OF parsing code. This patch also fixes a bunch of drivers to use the new code instead, so that at least pmac32, pseries, iseries and g5 defconfigs build. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Add pmac32 defconfig for ARCH=powerpcBenjamin Herrenschmidt2006-01-091-0/+1729
| | | | | | | This adds a defconfig for PowerMac with ARCH=powerpc Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Remove old comment in head.SAnton Blanchard2006-01-091-1/+1
| | | | | | | Remove a comment in head.S which is no longer relevant. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64: Add NUMA cpu summary at bootAnton Blanchard2006-01-092-3/+39
| | | | | | | | | | | | | | We used to print a NUMA cpu summary at boot before the hotplug cpu code was added. This has been useful for catching machine configuration as well as firmware bugs in the past. This patch restores that functionality. An example of the output is: Node 0 CPUs: 0-7 Node 1 CPUs: 8-15 Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: fix large nvram accessArnd Bergmann2006-01-091-56/+50
| | | | | | | | | | /dev/nvram uses the user-provided read/write size for kmalloc, which fails, if a large number is passed. This will always use a single page at most, which can be expected to succeed. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc/cell: disable legacy i/o areaDavid Woodhouse2006-01-091-0/+10
| | | | | | | | | | | We currently crash in the fedora installer because the keyboard driver tries to access I/O space that is not there on our hardware. This uses the same solution as powermac by just marking all legacy i/o as invalid. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc/cell: add iommu support for larger memoryJens.Osterkamp@de.ibm.com2006-01-091-49/+176
| | | | | | | | | | | | | | | | | | | So far, the iommu code was hardwired to a linear mapping between 0x20000000 and 0x40000000, so it could only support 512MB of RAM. This patch still keeps the linear mapping, but looks for proper ibm,dma-window properties to set up larger windows, this makes the maximum supported RAM size 2GB. If there is anything unusual about the dma-window properties, we fall back to the old behavior. We also support switching off the iommu completely now with the regular iommu=off command line option. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: clear dsisr on CLASS1[Mf] exceptionArnd Bergmann2006-01-091-1/+2
| | | | | | | | | | Because of always clearing DSISR at spu class 1 interrupt handler, kernel may lose Class1[Mf] interrupt. Signed-off-by: Masato Noguchi <Masato.Noguchi@jp.sony.com> Signed-off-by: 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: fix hexdump formatArnd Bergmann2006-01-091-1/+1
| | | | | | | | | | Output from hexdump with "%08x" depends on HOST platform's endian. When building linux by cross toolchain, that difference makes errors. Signed-off-by: Masato Noguchi <Masato.Noguchi@jp.sony.com> Signed-off-by: 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: trivial compile fixArnd Bergmann2006-01-091-1/+1
| | | | | | | | | One of my last patches contained a broken line from splitting out some other changes, this restores a working version. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: fix module refcount raceArnd Bergmann2006-01-091-1/+1
| | | | | | | | | | | One of the two users of spufs_calls.owner still has a race when calling try_module_get while the module is removed. This makes it use the correct instance of owner. Noticed by Milton Miller. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc32: Add TQM85xx (8540/8541/8555/8560) board supportKumar Gala2006-01-098-4/+4437
| | | | | | | | | This patch adds support for the TQ Components TQM85xx modules. Currently the modules TQM8540/8541/8555/8560 are supported. Signed-off-by: Stefan Roese <sr@denx.de> Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] cell: add platform detection codeArnd Bergmann2006-01-091-0/+2
| | | | | | | | | | | I can't really get a conclusive answer from the firmware people what to check for, so I just try scanning for anything that starts with "IBM,CPB", which should be correct for all hardware produced so far and for systemsim. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] spufs: fix mailbox pollingArnd Bergmann2006-01-096-24/+95
| | | | | | | | | | | | | | | | | | | | | | | | | | | 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: Improved SPU preemptability [part 2].Arnd Bergmann2006-01-093-27/+63
| | | | | | | | | | | | | | | | | | | This patch reduces lock complexity of SPU scheduler, particularly for involuntary preemptive switches. As a result the new code does a better job of mapping the highest priority tasks to SPUs. Lock complexity is reduced by using the system default workqueue to perform involuntary saves. In this way we avoid nasty lock ordering problems that the previous code had. A "minimum timeslice" for SPU contexts is also introduced. The intent here is to avoid thrashing. While the new scheduler does a better job at prioritization it still does nothing for fairness. From: Mark Nutter <mnutter@us.ibm.com> Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
generated by cgit v1.1 at 2024-12-26 20:18:48 +0000