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* sparc: Add kgdb support.David S. Miller2008-04-295-1/+208
| | | | | | | | | | | | | | Current limitations: 1) On SMP single stepping has some fundamental issues, shared with other sw single-step architectures such as mips and arm. 2) On 32-bit sparc we don't support SMP kgdb yet. That requires some reworking of the IPI mechanisms and infrastructure on that platform. Signed-off-by: David S. Miller <davem@davemloft.net>
* sparc64: Split entry.S up into seperate files.David S. Miller2008-04-2812-2576/+2641
| | | | | | | | | | entry.S was a hodge-podge of several totally unrelated sets of assembler routines, ranging from FPU trap handlers to hypervisor call functions. Split it up into topic-sized pieces. Signed-off-by: David S. Miller <davem@davemloft.net>
* sparc64: Fix accidental syscall restart on child return from clone/fork/vfork.David S. Miller2008-04-271-0/+6
| | | | | | | | | | | | | | | This fixes a regression added by 238468b2ac76020c192a7402c92df5097916bf4a ("[SPARC64]: Use trap type stored in pt_regs to handle syscall restart.") Because we now encode the "returning from syscall" status in the pt_regs area, we have to be mindful to zap it out in the child of a fork. During a parallel kernel build I saw an accidental -EINTR return from vfork() in 'make' because of this bug. Signed-off-by: David S. Miller <davem@davemloft.net>
* sparc64: Clean up handling of pt_regs trap type encoding.David S. Miller2008-04-271-4/+3
| | | | | | | | | | | | | If we use this from more than one place, it's better to have helpers instead of twiddling magic constants all over. Add pt_regs_trap_type(), pt_regs_clear_trap_type(), and pt_regs_is_syscall(). Use them in do_signal(). Signed-off-by: David S. Miller <davem@davemloft.net>
* sparc: Remove old style signal frame support.David S. Miller2008-04-273-268/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | Back around the same time we were bootstrapping the first 32-bit sparc Linux kernel with a SunOS userland, we made the signal frame match that of SunOS. By the time we even started putting together a native Linux userland for 32-bit Sparc we realized this layout wasn't sufficient for Linux's needs. Therefore we changed the layout, yet kept support for the old style signal frame layout in there. The detection mechanism is that we had sys_sigaction() start passing in a negative signal number to indicate "new style signal frames please". Anyways, no binaries exist in the world that use the old stuff. In fact, I bet Jakub Jelinek and myself are the only two people who ever had such binaries to be honest. So let's get rid of this stuff. I added an assertion using WARN_ON_ONCE() that makes sure 32-bit applications are passing in that negative signal number still. Signed-off-by: David S. Miller <davem@davemloft.net>
* sparc64: Kill bogus RT_ALIGNEDSZ macro from signal.cDavid S. Miller2008-04-271-4/+1
| | | | | | | The structure has to be 8-byte aligned in size, so this macro is just noise. Signed-off-by: David S. Miller <davem@davemloft.net>
* sparc64: Kill unused local ISA bus layer.David S. Miller2008-04-264-196/+1
| | | | | | No more drivers use this, and therefore it can die. Signed-off-by: David S. Miller <davem@davemloft.net>
* sparc64: Do not ignore 'pmu' device ranges.David S. Miller2008-04-261-6/+0
| | | | | | | | I must have disabled this due to other bugs which were fixed over time. And this is needed in order for child devices of "pmu" to get proper resource values. Signed-off-by: David S. Miller <davem@davemloft.net>
* sparc64: Kill CONFIG_SPARC32_COMPATDavid S. Miller2008-04-263-7/+7
| | | | | | | | | | | | | It's completely superfluous, CONFIG_COMPAT is sufficient. What this used to be is an umbrella for enabling code shared by all 32-bit compat binary support types. But with the removal of SunOS and Solaris support, the only one left is Linux 32-bit ELF. Update defconfig. Signed-off-by: David S. Miller <davem@davemloft.net>
* sparc64: Fix wedged irq regression.David S. Miller2008-04-261-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Kernel bugzilla 10273 As reported by Jos van der Ende, ever since commit 5a606b72a4309a656cd1a19ad137dc5557c4b8ea ("[SPARC64]: Do not ACK an INO if it is disabled or inprogress.") sun4u interrupts can get stuck. What this changset did was add the following conditional to the various IRQ chip ->enable() handlers on sparc64: if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS))) return; which is correct, however it means that special care is needed in the ->enable() method. Specifically we must put the interrupt into IDLE state during an enable, or else it might never be sent out again. Setting the INO interrupt state to IDLE resets the state machine, the interrupt input to the INO is retested by the hardware, and if an interrupt is being signalled by the device, the INO moves back into TRANSMIT state, and an interrupt vector is sent to the cpu. The two sun4v IRQ chip handlers were already doing this properly, only sun4u got it wrong. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Wrap SMP IPIs with irq_enter()/irq_exit().David S. Miller2008-04-251-5/+22
| | | | | | | | | | | | | Otherwise all sorts of bad things can happen, including spurious softlockup reports. Other platforms have this same bug, in one form or another, just don't see the issue because they don't sleep as long as sparc64 can in NOHZ. Thanks to some brilliant debugging by Peter Zijlstra. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Fix args to 64-bit sys_semctl() via sys_ipc().David S. Miller2008-04-251-2/+2
| | | | | | | | Second and third arguments were swapped for whatever reason. Reported by Tom Callaway. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Detect trap frames in stack backtraces.David S. Miller2008-04-242-7/+28
| | | | | | | Now that we have a magic cookie in the pt_regs, we can properly detect trap frames in stack bactraces. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: %l6 trap return handling no longer necessary.David S. Miller2008-04-247-53/+37
| | | | | | | | | | Now that we indicate the "restart system call" in the trap type field of pt_regs->magic, we don't need to set the %l6 boolean in all of the trap return paths. And we therefore don't need to pass it to do_notify_resume(). Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Use trap type stored in pt_regs to handle syscall restart.David S. Miller2008-04-242-21/+21
| | | | | | | Now that we can check the trap type directly, we don't need the funny restart_syscall indication from the trap return paths. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Store magic cookie and trap type in pt_regs.David S. Miller2008-04-231-0/+4
| | | | | | | | | | | | | | | | | | | This sets us up for several simplifications and facilities: 1) The magic cookie lets us identify trap frames more accurately in stack backtraces. 2) The trap type lets us simplify all of the "are we in a syscall" state management and checks. 3) We can now see if a task off the cpu is sleeping in a system call or not. In fact, we can see what trap it is sleeping in whatever the type. The utrace guys will use this. Based upon some discussions with Roland McGrath. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: PROM debug console can be CON_ANYTIME.David S. Miller2008-04-231-1/+1
| | | | | | | No per-cpu or similar resources need to be setup before we can use this console device. Signed-off-by: David S. Miller <davem@davemloft.net>
* sparc64: cleanup after SunOS/Solaris binary emulation removalAdrian Bunk2008-04-232-3/+1
| | | | | | | | | | The following cleanups are now possible: - arch/sparc64/kernel/entry.S:ret_sys_call no longer has to be global - arch/sparc64/kernel/sparc64_ksyms.c: remove no longer used prototypes Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Add NUMA support.David S. Miller2008-04-231-0/+12
| | | | | | | | Currently there is only code to parse NUMA attributes on sun4v/niagara systems, but later on we will add such parsing for older systems. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: NUMA device infrastructure.David S. Miller2008-04-2313-22/+82
| | | | | | Record and propagate NUMA information for devices. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Kill pci_iommu_table_init() declaration.David S. Miller2008-04-231-2/+0
| | | | | | No longer exists. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Once we have the boot cmdline, call parse_early_param()David S. Miller2008-04-231-0/+1
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Initialize MDESC earlier and use lmb_alloc()David S. Miller2008-04-231-12/+16
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Use lmb_alloc() for PROM device tree.David S. Miller2008-04-231-5/+9
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Call real_setup_per_cpu_areas() earlier and use lmb_alloc().David S. Miller2008-04-231-3/+8
| | | | | | | We have to do it like this before we can move the PROM and MDESC device tree code over to using lmb_alloc(). Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6Linus Torvalds2008-04-2112-2626/+15
|\ | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6: [SPARC]: Remove SunOS and Solaris binary support.
| * [SPARC]: Remove SunOS and Solaris binary support.David S. Miller2008-04-2112-2626/+15
| | | | | | | | | | | | As per Documentation/feature-removal-schedule.txt Signed-off-by: David S. Miller <davem@davemloft.net>
* | arch: Remove unnecessary inclusions of asm/semaphore.hMatthew Wilcox2008-04-181-1/+0
|/ | | | | | | | | None of these files use any of the functionality promised by asm/semaphore.h. It's possible that they rely on it dragging in some unrelated header file, but I can't build all these files, so we'll have fix any build failures as they come up. Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
* Generic semaphore implementationMatthew Wilcox2008-04-173-261/+1
| | | | | | | | | | | Semaphores are no longer performance-critical, so a generic C implementation is better for maintainability, debuggability and extensibility. Thanks to Peter Zijlstra for fixing the lockdep warning. Thanks to Harvey Harrison for pointing out that the unlikely() was unnecessary. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Acked-by: Ingo Molnar <mingo@elte.hu>
* [SPARC]: Fix several regset and ptrace bugs.David S. Miller2008-04-091-51/+97
| | | | | | | | | | | | | | | | | 1) ptrace should pass 'current' to task_user_regset_view() 2) When fetching general registers using a 64-bit view, and the target is 32-bit, we have to convert. 3) Skip the whole register window get/set code block if the user isn't asking to access anything in there. Otherwise we have problems if the user doesn't have an address space setup. Fetching ptrace register is still valid at such a time, and ptrace does not try to access the register window area of the regset. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Fix user accesses in regset code.David S. Miller2008-04-031-21/+115
| | | | | | | | If target is not current we need to use access_process_vm(). Noticed by Roland McGrath. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Fix FPU saving in 64-bit signal handling.David S. Miller2008-04-031-1/+1
| | | | | | | | | The calculation of the FPU reg save area pointer was wrong. Based upon an OOPS report from Tom Callaway. Signed-off-by: David S. Miller <davem@davemloft.net>
* sparc64: remove unused calc_npages() in iommu_common.hFUJITA Tomonori2008-03-281-13/+0
| | | | | | Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* sparc64: add the segment boundary checking to IOMMUs while merging SG entriesFUJITA Tomonori2008-03-283-4/+33
| | | | | | | | | | | | | | | | | | | | Some IOMMUs allocate memory areas spanning LLD's segment boundary limit. It forces low level drivers to have a workaround to adjust scatter lists that the IOMMU builds. We are in the process of making all the IOMMUs respect the segment boundary limits to remove such work around in LLDs. SPARC64 IOMMUs were rewritten to use the IOMMU helper functions and the commit 89c94f2f70d093f59b55d3ea8042d13889169346 made the IOMMUs not allocate memory areas spanning the segment boundary limit. However, SPARC64 IOMMUs allocate memory areas first then try to merge them (while some IOMMUs walk through all the sg entries to see how they can be merged first and allocate memory areas). So SPARC64 IOMMUs also need the boundary limit checking when they try to merge sg entries. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6Linus Torvalds2008-03-2614-111/+371
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6: [SPARC64]: Define TASK_SIZE_OF() [SPARC64]: flush_ptrace_access() needs preemption disable. [SPARC64]: Update defconfig. [SPARC64]: Fix allnoconfig build, ptrace.c missing CONFIG_COMPAT checks. [SPARC64]: Fix __get_cpu_var in preemption-enabled area. [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/signal.c [SPARC64]: Fix most sparse warnings in arch/sparc64/kernel/sys_sparc.c [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/time.c [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/ptrace.c [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/irq.c [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/iommu.c [SPARC64]: Fix sparse errors in arch/sparc64/kernel/traps.c [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/{cpu,setup}.c [SPARC64]: Adjust {TLBTEMP,TSBMAP}_BASE. [SPARC64]: Make save_stack_trace() more efficient.
| * [SPARC64]: flush_ptrace_access() needs preemption disable.David S. Miller2008-03-261-0/+4
| | | | | | | | | | | | Based upon a report by Mariusz Kozlowski. Signed-off-by: David S. Miller <davem@davemloft.net>
| * [SPARC64]: Fix allnoconfig build, ptrace.c missing CONFIG_COMPAT checks.David S. Miller2008-03-261-0/+6
| | | | | | | | Signed-off-by: David S. Miller <davem@davemloft.net>
| * [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/signal.cDavid S. Miller2008-03-263-0/+16
| | | | | | | | Signed-off-by: David S. Miller <davem@davemloft.net>
| * [SPARC64]: Fix most sparse warnings in arch/sparc64/kernel/sys_sparc.cDavid S. Miller2008-03-263-5/+56
| | | | | | | | | | | | | | | | | | Sparse still doesn't like the funny cast we make from a scalar to a "union semun" (which is correct by the C language and in particular works with the sparc64 calling conventions, but sparse doesn't grok that yet). Signed-off-by: David S. Miller <davem@davemloft.net>
| * [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/time.cDavid S. Miller2008-03-263-27/+44
| | | | | | | | Signed-off-by: David S. Miller <davem@davemloft.net>
| * [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/ptrace.cDavid S. Miller2008-03-262-3/+13
| | | | | | | | Signed-off-by: David S. Miller <davem@davemloft.net>
| * [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/irq.cDavid S. Miller2008-03-262-19/+29
| | | | | | | | Signed-off-by: David S. Miller <davem@davemloft.net>
| * [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/iommu.cDavid S. Miller2008-03-261-4/+4
| | | | | | | | | | | | | | | | Fix local variable shadowing in dma_4u_map_sg(). Mark sun4u_dma_ops static. Signed-off-by: David S. Miller <davem@davemloft.net>
| * [SPARC64]: Fix sparse errors in arch/sparc64/kernel/traps.cDavid S. Miller2008-03-262-46/+144
| | | | | | | | | | | | | | | | | | | | | | | | | | Add 'UL' markers to DCU_* macros. Declare C functions called from assembler in entry.h Declare C functions called from within the sparc64 arch code in include/asm-sparc64/*.h headers as appropriate. Remove unused routines in traps.c Signed-off-by: David S. Miller <davem@davemloft.net>
| * [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/{cpu,setup}.cDavid S. Miller2008-03-253-7/+23
| | | | | | | | | | | | | | | | | | We create a local header file entry.h, under arch/sparc64/kernel/, that we can use to declare routines either defined in assembler or only invoked from assembler. As well as other data objects which are private to the inner sparc64 kernel arch code. Signed-off-by: David S. Miller <davem@davemloft.net>
| * [SPARC64]: Make save_stack_trace() more efficient.David S. Miller2008-03-242-1/+33
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Doing a 'flushw' every stack trace capture creates so much overhead that it makes lockdep next to unusable. We only care about the frame pointer chain and the function caller program counters, so flush those by hand to the stack frame. This is significantly more efficient than a 'flushw' because: 1) We only save 16 bytes per active register window to the stack. 2) This doesn't push the entire register window context of the current call chain out of the cpu, forcing register window fill traps as we return back down. Note that we can't use 'restore' and 'save' instructions to move around the register windows because that wouldn't work on Niagara processors. They optimize 'save' into a new register window by simply clearing out the registers instead of pulling them in from the on-chip register window backing store. Based upon a report by Tom Callaway. Signed-off-by: David S. Miller <davem@davemloft.net>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6Linus Torvalds2008-03-246-142/+80
|\ \ | |/ | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6: [SPARC64]: exec PT_DTRACE [SPARC64]: Use shorter list_splice_init() for brevity. [SPARC64]: Remove most limitations to kernel image size.
| * [SPARC64]: exec PT_DTRACERoland McGrath2008-03-232-6/+0
| | | | | | | | | | | | | | | | The PT_DTRACE flag is meaningless and obsolete. Don't touch it. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * [SPARC64]: Use shorter list_splice_init() for brevity.Robert P. J. Day2008-03-231-2/+1
| | | | | | | | | | Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca> Signed-off-by: David S. Miller <davem@davemloft.net>
| * [SPARC64]: Remove most limitations to kernel image size.David S. Miller2008-03-213-134/+79
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently kernel images are limited to 8MB in size, and this causes problems especially when enabling features that take up a lot of kernel image space such as lockdep. The code now will align the kernel image size up to 4MB and map that many locked TLB entries. So, the only practical limitation is the number of available locked TLB entries which is 16 on Cheetah and 64 on pre-Cheetah sparc64 cpus. Niagara cpus don't actually have hw locked TLB entry support. Rather, the hypervisor transparently provides support for "locked" TLB entries since it runs with physical addressing and does the initial TLB miss processing. Fully utilizing this change requires some help from SILO, a patch for which will be submitted to the maintainer. Essentially, SILO will only currently map up to 8MB for the kernel image and that needs to be increased. Note that neither this patch nor the SILO bits will help with network booting. The openfirmware code will only map up to a certain amount of kernel image during a network boot and there isn't much we can to about that other than to implemented a layered network booting facility. Solaris has this, and calls it "wanboot" and we may implement something similar at some point. Signed-off-by: David S. Miller <davem@davemloft.net>
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