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* genirq: NULL struct irq_desc's member 'name' in dynamic_irq_cleanup()Dean Nelson2008-10-211-0/+1
| | | | | | | | | | | | | | | | | | If the member 'name' of the irq_desc structure happens to point to a character string that is resident within a kernel module, problems ensue if that module is rmmod'd (at which time dynamic_irq_cleanup() is called) and then later show_interrupts() is called by someone. It is also not a good thing if the character string resided in kmalloc'd space that has been kfree'd (after having called dynamic_irq_cleanup()). dynamic_irq_cleanup() fails to NULL the 'name' member and show_interrupts() references it on a few architectures (like h8300, sh and x86). Signed-off-by: Dean Nelson <dcn@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* genirq: fix set_irq_type() when recording trigger typeChris Friesen2008-10-211-1/+1
| | | | | | | | | | | | Impact: fix boot hang on a G5 In set_irq_type() we want to pass the type rather than the current interrupt state. Signed-off-by: Chris Friesen <cfriesen@nortel.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* genirq: cleanup the sparseirq modificationsThomas Gleixner2008-10-161-30/+13Star
| | | | Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* genirq: revert dynarrayThomas Gleixner2008-10-161-25/+5Star
| | | | | | Revert the dynarray changes. They need more thought and polishing. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* genirq: remove irq_to_desc_allocThomas Gleixner2008-10-161-1/+1
| | | | | | Remove the leftover of sparseirqs. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* irq: set_irq_chip() has redundant call to irq_to_desc()Dean Nelson2008-10-161-1/+0Star
| | | | | | | | Extraneous call to irq_to_desc(). Signed-off-by: Dean Nelson <dcn@sgi.com> Cc: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sparseirq: move kstat_irqs from kstat to irq_desc - fixYinghai Lu2008-10-161-1/+20
| | | | | | | fix non-sparseirq architectures. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86_64: rename irq_desc/irq_desc_allocYinghai Lu2008-10-161-10/+11
| | | | | | | | | | | | | | change names: irq_desc() ==> irq_desc_alloc __irq_desc() ==> irq_desc Also split a few of the uses in lowlevel x86 code. v2: need to check if desc is null in smp_irq_move_cleanup Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* irq: remove >= nr_irqs checking with config_have_sparse_irqYinghai Lu2008-10-161-22/+27
| | | | | | | | | | remove irq limit checks - nr_irqs is dynamic and we expand anytime. v2: fix checking about result irq_cfg_without_new, so could use msi again v3: use irq_desc_without_new to check irq is valid Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: move kstat_irqs from kstat to irq_descYinghai Lu2008-10-161-10/+5Star
| | | | | | | | | | | | | | | | | | | | | based on Eric's patch ... together mold it with dyn_array for irq_desc, will allcate kstat_irqs for nr_irq_desc alltogether if needed. -- at that point nr_cpus is known already. v2: make sure system without generic_hardirqs works they don't have irq_desc v3: fix merging v4: [mingo@elte.hu] fix typo [ mingo@elte.hu ] irq: build fix fix: arch/x86/xen/spinlock.c: In function 'xen_spin_lock_slow': arch/x86/xen/spinlock.c:90: error: 'struct kernel_stat' has no member named 'irqs' Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* generic: sparse irqs: use irq_desc() together with dyn_array, instead of ↵Yinghai Lu2008-10-161-13/+19
| | | | | | | | | | | | | | | | | | irq_desc[] add CONFIG_HAVE_SPARSE_IRQ to for use condensed array. Get rid of irq_desc[] array assumptions. Preallocate 32 irq_desc, and irq_desc() will try to get more. ( No change in functionality is expected anywhere, except the odd build failure where we missed a code site or where a crossing commit itroduces new irq_desc[] usage. ) v2: according to Eric, change get_irq_desc() to irq_desc() Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* irq: introduce nr_irqsYinghai Lu2008-10-161-10/+10
| | | | | | | | | | | at this point nr_irqs is equal NR_IRQS convert a few easy users from NR_IRQS to dynamic nr_irqs. v2: according to Eric, we need to take care of arch without generic_hardirqs Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* genirq: record trigger typeDavid Brownell2008-10-021-7/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Genirq hasn't previously recorded the trigger type used by any given IRQ, although some irq_chip support has done so. That data can be useful when troubleshooting. This patch records it in the relevant irq_desc.status bits, and improves consistency between the two driver-visible calls affected: - Make set_irq_type() usage match request_irq() usage: * IRQ_TYPE_NONE should be a NOP; succeed, so irq_chip methods won't have to handle that case any more (many do it wrong). * IRQ_TYPE_PROBE is ignored; any buggy out-of-tree callers might need to switch over to the real IRQ probing code. * emit the same diagnostics (from shared utility code) - Their kerneldoc now reflects usage: * request_irq() flags include IRQF_TRIGGER_* to specify active edge(s)/level ... docs previously omitted that * set_irq_type() is declared in <linux/irq.h> so callers should use the (bit-equivalent) IRQ_TYPE_* symbols there Also: adds a warning about shared IRQs that don't end up using the requested trigger mode; and fix an unrelated "sparse" warning. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* Merge commit 'v2.6.27-rc8' into genirqIngo Molnar2008-10-021-8/+4Star
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| * use WARN() in kernel/irq/chip.cArjan van de Ven2008-07-261-8/+4Star
| | | | | | | | | | | | | | | | | | | | Use WARN() instead of a printk+WARN_ON() pair; this way the message becomes part of the warning section for better reporting/collection. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | genirq: irq_chip->startup() usage in setup_irq and set_irq_chained handlerPawel MOLL2008-09-061-1/+1
|/ | | | | | | | | | | | | | | | | This patch clarifies usage of irq_chip->startup() callback: 1. The "if (startup) startup(); else enabled();" code in setup_irq() is unnecessary, as startup() falls back to enabled() via default callbacks, set by irq_chip_set_defaults(). 2. When using set_irq_chained_handler() the startup() was never called, which is not good at all... Fixed. And again - when startup() is not defined the call will fall back to enable() than to unmask() via default callbacks. Signed-off-by: Pawel Moll <pawel.moll@st.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* cpumask: Cleanup more uses of CPU_MASK and NODE_MASKMike Travis2008-04-191-1/+1
| | | | | | | | | | | | | | | * Replace usages of CPU_MASK_NONE, CPU_MASK_ALL, NODE_MASK_NONE, NODE_MASK_ALL to reduce stack requirements for large NR_CPUS and MAXNODES counts. * In some cases, the cpumask variable was initialized but then overwritten with another value. This is the case for changes like this: - cpumask_t oldmask = CPU_MASK_ALL; + cpumask_t oldmask; Signed-off-by: Mike Travis <travis@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* genirq: do not leave interupts enabled on free_irqThomas Gleixner2008-02-191-1/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | The default_disable() function was changed in commit: 76d2160147f43f982dfe881404cfde9fd0a9da21 genirq: do not mask interrupts by default It removed the mask function in favour of the default delayed interrupt disabling. Unfortunately this also broke the shutdown in free_irq() when the last handler is removed from the interrupt for those architectures which rely on the default implementations. Now we can end up with a enabled interrupt line after the last handler was removed, which can result in spurious interrupts. Fix this by adding a default_shutdown function, which is only installed, when the irqchip implementation does provide neither a shutdown nor a disable function. [@stable: affected versions: .21 - .24 ] Pointed-out-by: Michael Hennerich <Michael.Hennerich@analog.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: stable@kernel.org Tested-by: Michael Hennerich <Michael.Hennerich@analog.com>
* IRQ_NOPROBE helper functionsRalf Baechle2008-02-081-0/+36
| | | | | | | | | | | | | | | | | | | | | Probing non-ISA interrupts using the handle_percpu_irq as their handle_irq method may crash the system because handle_percpu_irq does not check IRQ_WAITING. This for example hits the MIPS Qemu configuration. This patch provides two helper functions set_irq_noprobe and set_irq_probe to set rsp. clear the IRQ_NOPROBE flag. The only current caller is MIPS code but this really belongs into generic code. As an aside, interrupt probing these days has become a mostly obsolete if not dangerous art. I think Linux interrupts should be changed to default to non-probing but that's subject of this patch. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Acked-and-tested-by: Rob Landley <rob@landley.net> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* kernel: remove fastcall in kernel/*Harvey Harrison2008-02-081-5/+5
| | | | | | | | [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* genirq: revert lazy irq disable for simple irqsSteven Rostedt2007-12-181-7/+2Star
| | | | | | | | | | | | | | | | | | | | In commit 76d2160147f43f982dfe881404cfde9fd0a9da21 lazy irq disabling was implemented, and the simple irq handler had a masking set to it. Remy Bohmer discovered that some devices in the ARM architecture would trigger the mask, but never unmask it. His patch to do the unmasking was questioned by Russell King about masking simple irqs to begin with. Looking further, it was discovered that the problems Remy was seeing was due to improper use of the simple handler by devices, and he later submitted patches to fix those. But the issue that was uncovered was that the simple handler should never mask. This patch reverts the masking in the simple handler. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
* Compile handle_percpu_irq even for uniprocessor kernelsRalf Baechle2007-10-171-3/+0Star
| | | | | | | | | | | | | | | | | Compiling handle_percpu_irq only on uniprocessor generates an artificial special case so a typical use like: set_irq_chip_and_handler(irq, &some_irq_type, handle_percpu_irq); needs to be conditionally compiled only on SMP systems as well and an alternative UP construct is usually needed - for no good reason. This fixes uniprocessor configurations for some MIPS SMP systems. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* genirq: cleanup mismerge artifactThomas Gleixner2007-08-121-4/+1Star
| | | | | | | | | | | | Commit 5a43a066b11ac2fe84cf67307f20b83bea390f83: "genirq: Allow fasteoi handler to retrigger disabled interrupts" was erroneously applied to handle_level_irq(). This added the irq retrigger / resend functionality to the level irq handler. Revert the offending bits. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* MSI: arch must connect the irq and the msi_descMichael Ellerman2007-05-031-0/+3
| | | | | | | | | | | | | | | | | | | | set_irq_msi() currently connects an irq_desc to an msi_desc. The archs call it at some point in their setup routine, and then the generic code sets up the reverse mapping from the msi_desc back to the irq. set_irq_msi() should do both connections, making it the one and only call required to connect an irq with it's MSI desc and vice versa. The arch code MUST call set_irq_msi(), and it must do so only once it's sure it's not going to fail the irq allocation. Given that there's no need for the arch to return the irq anymore, the return value from the arch setup routine just becomes 0 for success and anything else for failure. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] small irq management simplificationJan Beulich2007-02-161-4/+2Star
| | | | | | | | | | Use mask_ack_irq() where possible. Signed-off-by: Jan Beulich <jbeulich@novell.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] IRQ kernel-doc fixesRandy Dunlap2007-02-161-1/+1
| | | | | | | | Fix kernel-doc warnings in IRQ management. 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>
* [PATCH] genirq: do not mask interrupts by defaultIngo Molnar2007-02-161-7/+10
| | | | | | | | | | | | | | | | Never mask interrupts immediately upon request. Disabling interrupts in high-performance codepaths is rare, and on the other hand this change could recover lost edges (or even other types of lost interrupts) by conservatively only masking interrupts after they happen. (NOTE: with this change the highlevel irq-disable code still soft-disables this IRQ line - and if such an interrupt happens then the IRQ flow handler keeps the IRQ masked.) Mark i8529A controllers as 'never loses an edge'. Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* msi: Kill the msi_desc array.Eric W. Biederman2007-02-081-0/+28
| | | | | | | | | | | | | | | | | | | We need to be able to get from an irq number to a struct msi_desc. The msi_desc array in msi.c had several short comings the big one was that it could not be used outside of msi.c. Using irq_data in struct irq_desc almost worked except on some architectures irq_data needs to be used for something else. So this patch adds a msi_desc pointer to irq_desc, adds the appropriate wrappers and changes all of the msi code to use them. The dynamic_irq_init/cleanup code was tweaked to ensure the new field is left in a well defined state. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] genirq: fix irq flow handler uninstallThomas Gleixner2006-12-221-2/+1Star
| | | | | | | | | | | | | | The sanity check for no_irq_chip in __set_irq_hander() is unconditional on both install and uninstall of an handler. This triggers false warnings and replaces no_irq_chip by dummy_irq_chip in the uninstall case. Check only, when a real handler is installed. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Ingo Molnar <mingo@elte.hu> Acked-by: Sylvain Munaut <tnt@246tNt.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] __set_irq_handler bogus spaceGeert Uytterhoeven2006-12-211-1/+1
| | | | | | | __set_irq_handler: Kill a bogus space Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] some irq_chip variables point to NULLZhang, Yanmin2006-11-161-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | I got an oops when booting 2.6.19-rc5-mm1 on my ia64 machine. Below is the log. Oops 11012296146944 [1] Modules linked in: binfmt_misc dm_mirror dm_multipath dm_mod thermal processor f an container button sg eepro100 e100 mii Pid: 0, CPU 0, comm: swapper psr : 0000121008022038 ifs : 800000000000040b ip : [<a0000001000e1411>] Not tainted ip is at __do_IRQ+0x371/0x3e0 unat: 0000000000000000 pfs : 000000000000040b rsc : 0000000000000003 rnat: 656960155aa56aa5 bsps: a00000010058b890 pr : 656960155aa55a65 ldrs: 0000000000000000 ccv : 0000000000000000 fpsr: 0009804c0270033f csd : 0000000000000000 ssd : 0000000000000000 b0 : a0000001000e1390 b6 : a0000001005beac0 b7 : e00000007f01aa00 f6 : 000000000000000000000 f7 : 0ffe69090000000000000 f8 : 1000a9090000000000000 f9 : 0ffff8000000000000000 f10 : 1000a908ffffff6f70000 f11 : 1003e0000000000000909 r1 : a000000100fbbff0 r2 : 0000000000010002 r3 : 0000000000010001 r8 : fffffffffffbffff r9 : a000000100bd8060 r10 : a000000100dd83b8 r11 : fffffffffffeffff r12 : a000000100bcbbb0 r13 : a000000100bc4000 r14 : 0000000000010000 r15 : 0000000000010000 r16 : a000000100c01aa8 r17 : a000000100d2c350 r18 : 0000000000000000 r19 : a000000100d2c300 r20 : a000000100c01a88 r21 : 0000000080010100 r22 : a000000100c01ac0 r23 : a0000001000108e0 r24 : e000000477980004 r25 : 0000000000000000 r26 : 0000000000000000 r27 : e00000000913400c r28 : e0000004799ee51c r29 : e0000004778b87f0 r30 : a000000100d2c300 r31 : a00000010005c7e0 Call Trace: [<a000000100014600>] show_stack+0x40/0xa0 sp=a000000100bcb760 bsp=a000000100bc4f40 [<a000000100014f00>] show_regs+0x840/0x880 sp=a000000100bcb930 bsp=a000000100bc4ee8 [<a000000100037fb0>] die+0x250/0x320 sp=a000000100bcb930 bsp=a000000100bc4ea0 [<a00000010005e5f0>] ia64_do_page_fault+0x8d0/0xa20 sp=a000000100bcb950 bsp=a000000100bc4e50 [<a00000010000caa0>] ia64_leave_kernel+0x0/0x290 sp=a000000100bcb9e0 bsp=a000000100bc4e50 [<a0000001000e1410>] __do_IRQ+0x370/0x3e0 sp=a000000100bcbbb0 bsp=a000000100bc4df0 [<a000000100011f50>] ia64_handle_irq+0x170/0x220 sp=a000000100bcbbb0 bsp=a000000100bc4dc0 [<a00000010000caa0>] ia64_leave_kernel+0x0/0x290 sp=a000000100bcbbb0 bsp=a000000100bc4dc0 [<a000000100012390>] ia64_pal_call_static+0x90/0xc0 sp=a000000100bcbd80 bsp=a000000100bc4d78 [<a000000100015630>] default_idle+0x90/0x160 sp=a000000100bcbd80 bsp=a000000100bc4d58 [<a000000100014290>] cpu_idle+0x1f0/0x440 sp=a000000100bcbe20 bsp=a000000100bc4d18 [<a000000100009980>] rest_init+0xc0/0xe0 sp=a000000100bcbe20 bsp=a000000100bc4d00 [<a0000001009f8ea0>] start_kernel+0x6a0/0x6c0 sp=a000000100bcbe20 bsp=a000000100bc4ca0 [<a0000001000089f0>] __end_ivt_text+0x6d0/0x6f0 sp=a000000100bcbe30 bsp=a000000100bc4c00 <0>Kernel panic - not syncing: Aiee, killing interrupt handler! The root cause is that some irq_chip variables, especially ia64_msi_chip, initiate their memeber end to point to NULL. __do_IRQ doesn't check if irq_chip->end is null and just calls it after processing the interrupt. As irq_chip->end is called at many places, so I fix it by reinitiating irq_chip->end to dummy_irq_chip.end, e.g., a noop function. Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: "Luck, Tony" <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] genirq: clean up irq-flow-type namingIngo Molnar2006-10-171-24/+9Star
| | | | | | | | | | | | | Introduce desc->name and eliminate the handle_irq_name() hack. Add set_irq_chip_and_handler_name() to set the flow type and name at once. Signed-off-by: Ingo Molnar <mingo@elte.hu> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Matthew Wilcox <willy@debian.org> Cc: Kyle McMartin <kyle@mcmartin.ca> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* IRQ: Maintain regs pointer globally rather than passing to IRQ handlersDavid Howells2006-10-051-21/+15Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
* IRQ: Typedef the IRQ flow handler function typeDavid Howells2006-10-051-9/+3Star
| | | | | | | Typedef the IRQ flow handler function type. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 8e973fbdf5716b93a0a8c0365be33a31ca0fa351 commit)
* [PATCH] msi: simplify msi sanity checks by adding with generic irq codeEric W. Biederman2006-10-041-0/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently msi.c is doing sanity checks that make certain before an irq is destroyed it has no more users. By adding irq_has_action I can perform the test is a generic way, instead of relying on a msi specific data structure. By performing the core check in dynamic_irq_cleanup I ensure every user of dynamic irqs has a test present and we don't free resources that are in use. In msi.c this allows me to kill the attrib.state member of msi_desc and all of the assciated code to maintain it. To keep from freeing data structures when irq cleanup code is called to soon changing dyanamic_irq_cleanup is insufficient because there are msi specific data structures that are also not safe to free. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Tony Luck <tony.luck@intel.com> Cc: Andi Kleen <ak@suse.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Greg KH <greg@kroah.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] genirq: irq: add a dynamic irq creation APIEric W. Biederman2006-10-041-0/+56
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | With the msi support comes a new concept in irq handling, irqs that are created dynamically at run time. Currently the msi code allocates irqs backwards. First it allocates a platform dependent routing value for an interrupt the ``vector'' and then it figures out from the vector which irq you are on. This msi backwards allocator suffers from two basic problems. The allocator suffers because it is trying to do something that is architecture specific in a generic way making it brittle, inflexible, and tied to tightly to the architecture implementation. The alloctor also suffers from it's very backwards nature as it has tied things together that should have no dependencies. To solve the basic dynamic irq allocation problem two new architecture specific functions are added: create_irq and destroy_irq. create_irq takes no input and returns an unused irq number, that won't be reused until it is returned to the free poll with destroy_irq. The irq then can be used for any purpose although the only initial consumer is the msi code. destroy_irq takes an irq number allocated with create_irq and returns it to the free pool. Making this functionality per architecture increases the simplicity of the irq allocation code and increases it's flexibility. dynamic_irq_init() and dynamic_irq_cleanup() are added to automate the irq_desc initializtion that should happen for dynamic irqs. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Rajesh Shah <rajesh.shah@intel.com> Cc: Andi Kleen <ak@muc.de> Cc: "Protasevich, Natalie" <Natalie.Protasevich@UNISYS.com> Cc: "Luck, Tony" <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] irq: remove a extra lineYoichi Yuasa2006-09-291-4/+0Star
| | | | | | Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] irq: fixed coding styleYoichi Yuasa2006-09-291-1/+1
| | | | | | Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] genirq core: fix handle_level_irq()Ingo Molnar2006-09-191-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | while porting the -rt tree to 2.6.18-rc7 i noticed the following screaming-IRQ scenario on an SMP system: 2274 0Dn.:1 0.001ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.010ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.020ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.029ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.039ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.048ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.058ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.068ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.077ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.087ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) 2274 0Dn.:1 0.097ms: do_IRQ+0xc/0x103 <= (ret_from_intr+0x0/0xf) as it turns out, the bug is caused by handle_level_irq(), which if it races with another CPU already handling this IRQ, it _unmasks_ the IRQ line on the way out. This is not how 2.6.17 works, and we introduced this bug in one of the early genirq cleanups right before it went into -mm. (the bug was not in the genirq patchset for a long time, and we didnt notice the bug due to the lack of -rt rebase to the new genirq code. -rt, and hardirq-preemption in particular opens up such races much wider than anything else.) Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] genirq: Allow fasteoi handler to retrigger disabled interruptsBenjamin Herrenschmidt2006-07-031-1/+4
| | | | | | | | | | | Make the fasteoi handler mark disabled interrupts as pending if they happen anyway. This allow implementation of a delayed disable scheme with the fasteoi handler. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [ARM] 3690/1: genirq: Introduce and make use of dummy irq chipThomas Gleixner2006-07-011-3/+12
| | | | | | | | | | | | | | | | Patch from Thomas Gleixner From: Thomas Gleixner <tglx@linutronix.de> ARM has a couple of really dumb interrupt controllers. Implement a generic one and fixup the ARM migration. ARM reused the no_irq_chip for this purpose, but this does not work out for platforms which are not converted to the new interrupt type handling model. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [PATCH] genirq: add chip->eoi(), fastack -> fasteoiIngo Molnar2006-06-291-14/+11Star
| | | | | | | | | | | | | | Clean up the fastack concept by turning it into fasteoi and introducing the ->eoi() method for chips. This also allows the cleanup of an i386 EOI quirk - now the quirk is cleanly separated from the pure ACK implementation. Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Roland Dreier <rolandd@cisco.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] genirq: fasteoi handler: handle interrupt disablingBenjamin Herrenschmidt2006-06-291-1/+4
| | | | | | | | | | | Note when a disable interrupt happened with the fasteoi handler as well so that delayed disable can be implemented with fasteoi-type controllers. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] genirq: add irq-chip supportThomas Gleixner2006-06-291-0/+525
Enable platforms to use the irq-chip and irq-flow abstractions: allow setting of the chip, the type and provide highlevel handlers for common irq-flows. [rostedt@goodmis.org: misroute-irq: Don't call desc->chip->end because of edge interrupts] Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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