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* [PATCH] POLLRDHUP/EPOLLRDHUP handling for half-closed devices notificationsDavide Libenzi2006-03-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Implement the half-closed devices notifiation, by adding a new POLLRDHUP (and its alias EPOLLRDHUP) bit to the existing poll/select sets. Since the existing POLLHUP handling, that does not report correctly half-closed devices, was feared to be changed, this implementation leaves the current POLLHUP reporting unchanged and simply add a new bit that is set in the few places where it makes sense. The same thing was discussed and conceptually agreed quite some time ago: http://lkml.org/lkml/2003/7/12/116 Since this new event bit is added to the existing Linux poll infrastruture, even the existing poll/select system calls will be able to use it. As far as the existing POLLHUP handling, the patch leaves it as is. The pollrdhup-2.6.16.rc5-0.10.diff defines the POLLRDHUP for all the existing archs and sets the bit in the six relevant files. The other attached diff is the simple change required to sys/epoll.h to add the EPOLLRDHUP definition. There is "a stupid program" to test POLLRDHUP delivery here: http://www.xmailserver.org/pollrdhup-test.c It tests poll(2), but since the delivery is same epoll(2) will work equally. Signed-off-by: Davide Libenzi <davidel@xmailserver.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Michael Kerrisk <mtk-manpages@gmx.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] more for_each_cpu() conversionsAndrew Morton2006-03-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When we stop allocating percpu memory for not-possible CPUs we must not touch the percpu data for not-possible CPUs at all. The correct way of doing this is to test cpu_possible() or to use for_each_cpu(). This patch is a kernel-wide sweep of all instances of NR_CPUS. I found very few instances of this bug, if any. But the patch converts lots of open-coded test to use the preferred helper macros. Cc: Mikael Starvik <starvik@axis.com> Cc: David Howells <dhowells@redhat.com> Acked-by: Kyle McMartin <kyle@parisc-linux.org> Cc: Anton Blanchard <anton@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: William Lee Irwin III <wli@holomorphy.com> Cc: Andi Kleen <ak@muc.de> Cc: Christian Zankel <chris@zankel.net> Cc: Philippe Elie <phil.el@wanadoo.fr> Cc: Nathan Scott <nathans@sgi.com> Cc: Jens Axboe <axboe@suse.de> Cc: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] atomic: add_unless cmpxchg optimiseNick Piggin2006-03-23
| | | | | | | | | | | | | | | | | Without branch hints, the very unlikely chance of the loop repeating due to cmpxchg failure is unrolled with gcc-4 that I have tested. Improve this for architectures with a native cas/cmpxchg. llsc archs should try to implement this natively. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Andi Kleen <ak@muc.de> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Move read_mostly definition to asm/cache.hKyle McMartin2006-03-23
| | | | | | | | | | | | | | Seems like needless clutter having a bunch of #if defined(CONFIG_$ARCH) in include/linux/cache.h. Move the per architecture section definition to asm/cache.h, and keep the if-not-defined dummy case in linux/cache.h to catch architectures which don't implement the section. Verified that symbols still go in .data.read_mostly on parisc, and the compile doesn't break. Signed-off-by: Kyle McMartin <kyle@parisc-linux.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [SPARC64]: Add a secondary TSB for hugepage mappings.David S. Miller2006-03-22
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Fix 2 bugs in huge page support.David S. Miller2006-03-20
| | | | | | | | | | 1) huge_pte_offset() did not check the page table hierarchy elements as being empty correctly, resulting in an OOPS 2) Need platform specific hugetlb_get_unmapped_area() to handle the top-down vs. bottom-up address space allocation strategies. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Optimized TSB table initialization.David S. Miller2006-03-20
| | | | | | | | | | | | | | We only need to write an invalid tag every 16 bytes, so taking advantage of this can save many instructions compared to the simple memset() call we make now. A prefetching implementation is implemented for sun4u and a block-init store version if implemented for Niagara. The next trick is to be able to perform an init and a copy_tsb() in parallel when growing a TSB table. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Increase top of 32-bit process stack.David S. Miller2006-03-20
| | | | | | | Put it one page below the top of the 32-bit address space. This gives us ~16MB more address space to work with. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Top-down address space allocation for 32-bit tasks.David S. Miller2006-03-20
| | | | | | | | | | | | | | Currently allocations are very constrained for 32-bit processes. It grows down-up from 0x70000000 to 0xf0000000 which gives about 2GB of stack + dynamic mmap() space. So support the top-down method, and we need to override the generic helper function in order to deal with D-cache coloring. With these changes I was able to squeeze out a mmap() just over 3.6GB in size in a 32-bit process. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Fix and re-enable dynamic TSB sizing.David S. Miller2006-03-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is good for up to %50 performance improvement of some test cases. The problem has been the race conditions, and hopefully I've plugged them all up here. 1) There was a serious race in switch_mm() wrt. lazy TLB switching to and from kernel threads. We could erroneously skip a tsb_context_switch() and thus use a stale TSB across a TSB grow event. There is a big comment now in that function describing exactly how it can happen. 2) All code paths that do something with the TSB need to be guarded with the mm->context.lock spinlock. This makes page table flushing paths properly synchronize with both TSB growing and TLB context changes. 3) TSB growing events are moved to the end of successful fault processing. Previously it was in update_mmu_cache() but that is deadlock prone. At the end of do_sparc64_fault() we hold no spinlocks that could deadlock the TSB grow sequence. We also have dropped the address space semaphore. While we're here, add prefetching to the copy_tsb() routine and put it in assembler into the tsb.S file. This piece of code is quite time critical. There are some small negative side effects to this code which can be improved upon. In particular we grab the mm->context.lock even for the tsb insert done by update_mmu_cache() now and that's a bit excessive. We can get rid of that locking, and the same lock taking in flush_tsb_user(), by disabling PSTATE_IE around the whole operation including the capturing of the tsb pointer and tsb_nentries value. That would work because anyone growing the TSB won't free up the old TSB until all cpus respond to the TSB change cross call. I'm not quite so confident in that optimization to put it in right now, but eventually we might be able to and the description is here for reference. This code seems very solid now. It passes several parallel GCC bootstrap builds, and our favorite "nut cruncher" stress test which is a full "make -j8192" build of a "make allmodconfig" kernel. That puts about 256 processes on each cpu's run queue, makes lots of process cpu migrations occur, causes lots of page table and TLB flushing activity, incurs many context version number changes, and it swaps the machine real far out to disk even though there is 16GB of ram on this test system. :-) Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Fix system type in /proc/cpuinfo and remove bogus OBP check.David S. Miller2006-03-20
| | | | | | | | | | Report 'sun4v' when appropriate in /proc/cpuinfo Remove all the verifications of the OBP version string. Just make sure it's there, and report it raw in the bootup logs and via /proc/cpuinfo. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Add SMT scheduling support for Niagara.David S. Miller2006-03-20
| | | | | | | | | | | | The mapping is a simple "(cpuid >> 2) == core" for now. Later we'll add more sophisticated code that will walk the sun4v machine description and figure this out from there. We should also add core mappings for jaguar and panther processors. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Move over to sparsemem.David S. Miller2006-03-20
| | | | | | | | This has been pending for a long time, and the fact that we waste a ton of ram on some configurations kind of pushed things over the edge. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Fix new context version SMP handling.David S. Miller2006-03-20
| | | | | | | | | | | | | | | | Don't piggy back the SMP receive signal code to do the context version change handling. Instead allocate another fixed PIL number for this asynchronous cross-call. We can't use smp_call_function() because this thing is invoked with interrupts disabled and a few spinlocks held. Also, fix smp_call_function_mask() to count "cpus" correctly. There is no guarentee that the local cpu is in the mask yet that is exactly what this code was assuming. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Bulletproof MMU context locking.David S. Miller2006-03-20
| | | | | | | | | | | 1) Always spin_lock_init() in init_context(). The caller essentially clears it out, or copies the mm info from the parent. In both cases we need to explicitly initialize the spinlock. 2) Always do explicit IRQ disabling while taking mm->context.lock and ctx_alloc_lock. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Do not allow mapping pages within 4GB of 64-bit VA hole.David S. Miller2006-03-20
| | | | | | | | | | The UltraSPARC T1 manual recommends this because the chip could instruction prefetch into the VA hole, and this would also make decoding certain kinds of memory access traps more difficult (because the chip sign extends certain pieces of trap state). Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Kill bogus function externs in asm/pgtable.hDavid S. Miller2006-03-20
| | | | | | These are all implemented inline earlier in the file. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Fix bugs in SUN4V cpu mondo dispatch.David S. Miller2006-03-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There were several bugs in the SUN4V cpu mondo dispatch code. In fact, if we ever got a EWOULDBLOCK or other error from the hypervisor call, we'd potentially send a cpu mondo multiple times to the same cpu and even worse we could loop until the timeout resending the same mondo over and over to such cpus. So let's bulletproof this thing as follows: 1) Implement cpu_mondo_send() and cpu_state() hypervisor calls in arch/sparc64/kernel/entry.S, add prototypes to asm/hypervisor.h 2) Don't build and update the cpulist using inline functions, this was causing the cpu mask to not get updated in the caller. 3) Disable interrupts during the entire mondo send, otherwise our cpu list and/or mondo block could get overwritten if we take an interrupt and do a cpu mondo send on the current cpu. 4) Check for all possible error return types from the cpu_mondo_send() hypervisor call. In particular: HV_EOK) Our work is done, all cpus have received the mondo. HV_CPUERROR) One or more of the cpus in the cpu list we passed to the hypervisor are in error state. Use cpu_state() calls over the entries in the cpu list to see which ones. Record them in "error_mask" and report this after we are done sending the mondo to cpus which are not in error state. HV_EWOULDBLOCK) We need to keep trying. Any other error we consider fatal, we report the event and exit immediately. 5) We only timeout if forward progress is not made. Forward progress is defined as having at least one cpu get the mondo successfully in a given cpu_mondo_send() call. Otherwise we bump a counter and delay a little. If the counter hits a limit, we signal an error and report the event. Also, smp_call_function_mask() error handling reports the number of cpus incorrectly. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Use 13-bit context size always.David S. Miller2006-03-20
| | | | | | | We no longer have the problems that require using the smaller sizes. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Niagara optimized XOR functions for RAID.David S. Miller2006-03-20
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Fix TLB context allocation with SMT style shared TLBs.David S. Miller2006-03-20
| | | | | | | | | | | | | | | The context allocation scheme we use depends upon there being a 1<-->1 mapping from cpu to physical TLB for correctness. Chips like Niagara break this assumption. So what we do is notify all cpus with a cross call when the context version number changes, and if necessary this makes them allocate a valid context for the address space they are running at the time. Stress tested with make -j1024, make -j2048, and make -j4096 kernel builds on a 32-strand, 8 core, T2000 with 16GB of ram. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Fix %tstate ASI handling in start_thread{,32}()David S. Miller2006-03-20
| | | | | | | | | | | | | | | | | | | | | | | | Niagara helps us find a ancient bug in the sparc64 port :-) The ASI_* values are plain constant defines, thus signed 32-bit on sparc64. To put shift this into the regs->tstate value we were doing or'ing "(ASI_PNF << 24)" into there. ASI_PNF is 0x82 and shifted left by 24 makes that topmost bit the sign bit in a 32-bit value. This would get sign extended to 64-bits and thus corrupt the top-half of the reg->tstate value. This never caused problems in pre-Niagara cpus because the only thing up there were the condition code values. But Niagara has the global register level field, and this all 1's value is illegal there so Niagara gives an illegal instruction trap due to this bug. I'm pretty sure this bug is about as old as the sparc64 port itself. This also points out that we weren't setting ASI_PNF for 32-bit tasks. We should, so fix that while we're here. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Create a seperate kernel TSB for 4MB/256MB mappings.David S. Miller2006-03-20
| | | | | | | | | | It can map all of the linear kernel mappings with zero TSB hash conflicts for systems with 16GB or less ram. In such cases, on SUN4V, once we load up this TSB the first time with all the mappings, we never take a linear kernel mapping TLB miss ever again, the hypervisor handles them all. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Add sun4v_cpu_yield().David S. Miller2006-03-20
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Kill cpudata->idle_volume.David S. Miller2006-03-20
| | | | | | | | | Set, but never used. We used to use this for dynamic IRQ retargetting, but that code died a long time ago. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Export a PAGE_SHARED symbol.David S. Miller2006-03-20
| | | | | | For drivers/media/*, noticed by Fabbione. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64] Fix build if CONFIG_HUGETLB_PAGE is not setFabio M. Di Nitto2006-03-20
| | | | | Signed-off-by: Fabio M. Di Nitto <fabbione@ubuntu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: More TLB/TSB handling fixes.David S. Miller2006-03-20
| | | | | | | | | | | | | | | The SUN4V convention with non-shared TSBs is that the context bit of the TAG is clear. So we have to choose an "invalid" bit and initialize new TSBs appropriately. Otherwise a zero TAG looks "valid". Make sure, for the window fixup cases, that we use the right global registers and that we don't potentially trample on the live global registers in etrap/rtrap handling (%g2 and %g6) and that we put the missing virtual address properly in %g5. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Define ARCH_HAS_READ_CURRENT_TIMER.David S. Miller2006-03-20
| | | | | | | This gives more consistent bogomips and delay() semantics, especially on sun4v. It gives weird looking values though... Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: __bzero_noasi --> __clear_userDavid S. Miller2006-03-20
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Add HWCAP_SPARC_BLKINIT elf capability flag for Niagara.David S. Miller2006-03-20
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Fix uniprocessor IRQ targetting on SUN4V.David S. Miller2006-03-20
| | | | | | | | | | | We need to use the real hardware processor ID when targetting interrupts, not the "define to 0" thing the uniprocessor build gives us. Also, fill in the Node-ID and Agent-ID fields properly on sun4u/Safari. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Get SUN4V SMP working.David S. Miller2006-03-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The sibling cpu bringup is extremely fragile. We can only perform the most basic calls until we take over the trap table from the firmware/hypervisor on the new cpu. This means no accesses to %g4, %g5, %g6 since those can't be TLB translated without our trap handlers. In order to achieve this: 1) Change sun4v_init_mondo_queues() so that it can operate in several modes. It can allocate the queues, or install them in the current processor, or both. The boot cpu does both in it's call early on. Later, the boot cpu allocates the sibling cpu queue, starts the sibling cpu, then the sibling cpu loads them in. 2) init_cur_cpu_trap() is changed to take the current_thread_info() as an argument instead of reading %g6 directly on the current cpu. 3) Create a trampoline stack for the sibling cpus. We do our basic kernel calls using this stack, which is locked into the kernel image, then go to our proper thread stack after taking over the trap table. 4) While we are in this delicate startup state, we put 0xdeadbeef into %g4/%g5/%g6 in order to catch accidental accesses. 5) On the final prom_set_trap_table*() call, we put &init_thread_union into %g6. This is a hack to make prom_world(0) work. All that wants to do is restore the %asi register using get_thread_current_ds(). Longer term we should just do the OBP calls to set the trap table by hand just like we do for everything else. This would avoid that silly prom_world(0) issue, then we can remove the init_thread_union hack. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Add GET_GL_GLOBAL() macro for SUN4V.David S. Miller2006-03-20
| | | | | | So we can read the %gl register for debugging. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Add sun4v_cpu_qconf() hypervisor call.David S. Miller2006-03-20
| | | | | | Call it from register_one_mondo(). Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC]: Kill off these __put_user_ret things.David S. Miller2006-03-20
| | | | | | They are bogus and haven't been referenced in years. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Decode virtual-devices interrupts correctly.David S. Miller2006-03-20
| | | | | | Need to translate through the interrupt-map{,-mask] properties. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Add prom_{start,stop}cpu_cpuid().David S. Miller2006-03-20
| | | | | | | | | Use prom_startcpu_cpuid() on SUN4V instead of prom_startcpu(). We should really test for "SUNW,start-cpu-by-cpuid" presence and use it if present even on SUN4U. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Fixup TSTATE layout diagram in asm/pstate.hDavid S. Miller2006-03-20
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Fix gcc-3.3.x warnings.David S. Miller2006-03-20
| | | | | | | | | | | It doesn't like const variables being passed into "i" constraing asm operations. It's a bug, but there is nothing we can really do but work around it. Based upon a report from Andrew Morton. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Make error codes available from sun4v_intr_get*().David S. Miller2006-03-20
| | | | | | And check for errors at call sites. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Fix comment typo in asm/hypervisor.hDavid S. Miller2006-03-20
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Probe virtual-devices root node on sun4v.David S. Miller2006-03-20
| | | | | | | This is where we learn how to get the interrupts for things like the hypervisor console device. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Generic sun4v_build_irq().David S. Miller2006-03-20
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Implement rest of generic interrupt hypervisor calls.David S. Miller2006-03-20
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Move devino_to_sysino out of pci_sun4v_asm.SDavid S. Miller2006-03-20
| | | | | | It is not PCI specific, it is for all system interrupts. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Use inline patching for critical PTE operations.David S. Miller2006-03-20
| | | | | | | This handles the SUN4U vs SUN4V PTE layout differences with near zero performance cost. Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Move PTE field definitions back into asm/pgtable.hDavid S. Miller2006-03-20
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Recognize "virtual-console" as input and output console device.David S. Miller2006-03-20
| | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* [SPARC64]: Deal with PTE layout differences in SUN4V.David S. Miller2006-03-20
| | | | | | | | | | Yes, you heard it right, they changed the PTE layout for SUN4V. Ho hum... This is the simple and inefficient way to support this. It'll get optimized, don't worry. Signed-off-by: David S. Miller <davem@davemloft.net>
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