![Benjamin Herrenschmidt](/assets/img/avatar_default.png)
The current implementation of lazy interrupts handling has some issues that this tries to address. We don't do the various workarounds we need to do when re-enabling interrupts in some cases such as when returning from an interrupt and thus we may still lose or get delayed decrementer or doorbell interrupts. The current scheme also makes it much harder to handle the external "edge" interrupts provided by some BookE processors when using the EPR facility (External Proxy) and the Freescale Hypervisor. Additionally, we tend to keep interrupts hard disabled in a number of cases, such as decrementer interrupts, external interrupts, or when a masked decrementer interrupt is pending. This is sub-optimal. This is an attempt at fixing it all in one go by reworking the way we do the lazy interrupt disabling from the ground up. The base idea is to replace the "hard_enabled" field with a "irq_happened" field in which we store a bit mask of what interrupt occurred while soft-disabled. When re-enabling, either via arch_local_irq_restore() or when returning from an interrupt, we can now decide what to do by testing bits in that field. We then implement replaying of the missed interrupts either by re-using the existing exception frame (in exception exit case) or via the creation of a new one from an assembly trampoline (in the arch_local_irq_enable case). This removes the need to play with the decrementer to try to create fake interrupts, among others. In addition, this adds a few refinements: - We no longer hard disable decrementer interrupts that occur while soft-disabled. We now simply bump the decrementer back to max (on BookS) or leave it stopped (on BookE) and continue with hard interrupts enabled, which means that we'll potentially get better sample quality from performance monitor interrupts. - Timer, decrementer and doorbell interrupts now hard-enable shortly after removing the source of the interrupt, which means they no longer run entirely hard disabled. Again, this will improve perf sample quality. - On Book3E 64-bit, we now make the performance monitor interrupt act as an NMI like Book3S (the necessary C code for that to work appear to already be present in the FSL perf code, notably calling nmi_enter instead of irq_enter). (This also fixes a bug where BookE perfmon interrupts could clobber r14 ... oops) - We could make "masked" decrementer interrupts act as NMIs when doing timer-based perf sampling to improve the sample quality. Signed-off-by-yet: Benjamin Herrenschmidt <benh@kernel.crashing.org> --- v2: - Add hard-enable to decrementer, timer and doorbells - Fix CR clobber in masked irq handling on BookE - Make embedded perf interrupt act as an NMI - Add a PACA_HAPPENED_EE_EDGE for use by FSL if they want to retrigger an interrupt without preventing hard-enable v3: - Fix or vs. ori bug on Book3E - Fix enabling of interrupts for some exceptions on Book3E v4: - Fix resend of doorbells on return from interrupt on Book3E v5: - Rebased on top of my latest series, which involves some significant rework of some aspects of the patch. v6: - 32-bit compile fix - more compile fixes with various .config combos - factor out the asm code to soft-disable interrupts - remove the C wrapper around preempt_schedule_irq v7: - Fix a bug with hard irq state tracking on native power7
1251 lines
30 KiB
C
1251 lines
30 KiB
C
/*
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* Derived from arch/i386/kernel/irq.c
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* Copyright (C) 1992 Linus Torvalds
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* Adapted from arch/i386 by Gary Thomas
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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* Updated and modified by Cort Dougan <cort@fsmlabs.com>
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* Copyright (C) 1996-2001 Cort Dougan
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* Adapted for Power Macintosh by Paul Mackerras
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* Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* This file contains the code used by various IRQ handling routines:
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* asking for different IRQ's should be done through these routines
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* instead of just grabbing them. Thus setups with different IRQ numbers
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* shouldn't result in any weird surprises, and installing new handlers
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* should be easier.
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*
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* The MPC8xx has an interrupt mask in the SIU. If a bit is set, the
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* interrupt is _enabled_. As expected, IRQ0 is bit 0 in the 32-bit
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* mask register (of which only 16 are defined), hence the weird shifting
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* and complement of the cached_irq_mask. I want to be able to stuff
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* this right into the SIU SMASK register.
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* Many of the prep/chrp functions are conditional compiled on CONFIG_8xx
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* to reduce code space and undefined function references.
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*/
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#undef DEBUG
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#include <linux/export.h>
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#include <linux/threads.h>
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#include <linux/kernel_stat.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/ptrace.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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#include <linux/timex.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/irq.h>
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#include <linux/seq_file.h>
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#include <linux/cpumask.h>
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#include <linux/profile.h>
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#include <linux/bitops.h>
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#include <linux/list.h>
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#include <linux/radix-tree.h>
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#include <linux/mutex.h>
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#include <linux/bootmem.h>
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#include <linux/pci.h>
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#include <linux/debugfs.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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#include <asm/irq.h>
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#include <asm/cache.h>
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#include <asm/prom.h>
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#include <asm/ptrace.h>
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#include <asm/machdep.h>
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#include <asm/udbg.h>
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#include <asm/smp.h>
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#ifdef CONFIG_PPC64
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#include <asm/paca.h>
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#include <asm/firmware.h>
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#include <asm/lv1call.h>
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#endif
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#define CREATE_TRACE_POINTS
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#include <asm/trace.h>
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DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
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EXPORT_PER_CPU_SYMBOL(irq_stat);
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int __irq_offset_value;
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#ifdef CONFIG_PPC32
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EXPORT_SYMBOL(__irq_offset_value);
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atomic_t ppc_n_lost_interrupts;
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#ifdef CONFIG_TAU_INT
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extern int tau_initialized;
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extern int tau_interrupts(int);
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#endif
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#endif /* CONFIG_PPC32 */
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#ifdef CONFIG_PPC64
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int distribute_irqs = 1;
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static inline notrace unsigned long get_irq_happened(void)
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{
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unsigned long happened;
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__asm__ __volatile__("lbz %0,%1(13)"
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: "=r" (happened) : "i" (offsetof(struct paca_struct, irq_happened)));
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return happened;
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}
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static inline notrace void set_soft_enabled(unsigned long enable)
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{
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__asm__ __volatile__("stb %0,%1(13)"
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: : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled)));
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}
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static inline notrace int decrementer_check_overflow(void)
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{
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u64 now = get_tb_or_rtc();
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u64 *next_tb = &__get_cpu_var(decrementers_next_tb);
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if (now >= *next_tb)
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set_dec(1);
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return now >= *next_tb;
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}
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/* This is called whenever we are re-enabling interrupts
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* and returns either 0 (nothing to do) or 500/900 if there's
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* either an EE or a DEC to generate.
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*
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* This is called in two contexts: From arch_local_irq_restore()
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* before soft-enabling interrupts, and from the exception exit
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* path when returning from an interrupt from a soft-disabled to
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* a soft enabled context. In both case we have interrupts hard
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* disabled.
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*
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* We take care of only clearing the bits we handled in the
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* PACA irq_happened field since we can only re-emit one at a
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* time and we don't want to "lose" one.
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*/
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notrace unsigned int __check_irq_replay(void)
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{
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/*
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* We use local_paca rather than get_paca() to avoid all
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* the debug_smp_processor_id() business in this low level
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* function
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*/
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unsigned char happened = local_paca->irq_happened;
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/* Clear bit 0 which we wouldn't clear otherwise */
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local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS;
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/*
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* Force the delivery of pending soft-disabled interrupts on PS3.
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* Any HV call will have this side effect.
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*/
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if (firmware_has_feature(FW_FEATURE_PS3_LV1)) {
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u64 tmp, tmp2;
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lv1_get_version_info(&tmp, &tmp2);
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}
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/*
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* We may have missed a decrementer interrupt. We check the
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* decrementer itself rather than the paca irq_happened field
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* in case we also had a rollover while hard disabled
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*/
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local_paca->irq_happened &= ~PACA_IRQ_DEC;
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if (decrementer_check_overflow())
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return 0x900;
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/* Finally check if an external interrupt happened */
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local_paca->irq_happened &= ~PACA_IRQ_EE;
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if (happened & PACA_IRQ_EE)
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return 0x500;
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#ifdef CONFIG_PPC_BOOK3E
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/* Finally check if an EPR external interrupt happened
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* this bit is typically set if we need to handle another
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* "edge" interrupt from within the MPIC "EPR" handler
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*/
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local_paca->irq_happened &= ~PACA_IRQ_EE_EDGE;
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if (happened & PACA_IRQ_EE_EDGE)
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return 0x500;
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local_paca->irq_happened &= ~PACA_IRQ_DBELL;
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if (happened & PACA_IRQ_DBELL)
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return 0x280;
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#endif /* CONFIG_PPC_BOOK3E */
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/* There should be nothing left ! */
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BUG_ON(local_paca->irq_happened != 0);
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return 0;
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}
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notrace void arch_local_irq_restore(unsigned long en)
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{
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unsigned char irq_happened;
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unsigned int replay;
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/* Write the new soft-enabled value */
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set_soft_enabled(en);
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if (!en)
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return;
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/*
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* From this point onward, we can take interrupts, preempt,
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* etc... unless we got hard-disabled. We check if an event
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* happened. If none happened, we know we can just return.
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*
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* We may have preempted before the check below, in which case
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* we are checking the "new" CPU instead of the old one. This
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* is only a problem if an event happened on the "old" CPU.
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*
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* External interrupt events on non-iseries will have caused
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* interrupts to be hard-disabled, so there is no problem, we
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* cannot have preempted.
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*
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* That leaves us with EEs on iSeries or decrementer interrupts,
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* which I decided to safely ignore. The preemption would have
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* itself been the result of an interrupt, upon which return we
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* will have checked for pending events on the old CPU.
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*/
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irq_happened = get_irq_happened();
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if (!irq_happened)
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return;
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/*
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* We need to hard disable to get a trusted value from
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* __check_irq_replay(). We also need to soft-disable
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* again to avoid warnings in there due to the use of
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* per-cpu variables.
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*
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* We know that if the value in irq_happened is exactly 0x01
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* then we are already hard disabled (there are other less
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* common cases that we'll ignore for now), so we skip the
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* (expensive) mtmsrd.
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*/
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if (unlikely(irq_happened != PACA_IRQ_HARD_DIS))
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__hard_irq_disable();
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set_soft_enabled(0);
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/*
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* Check if anything needs to be re-emitted. We haven't
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* soft-enabled yet to avoid warnings in decrementer_check_overflow
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* accessing per-cpu variables
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*/
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replay = __check_irq_replay();
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/* We can soft-enable now */
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set_soft_enabled(1);
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/*
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* And replay if we have to. This will return with interrupts
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* hard-enabled.
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*/
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if (replay) {
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__replay_interrupt(replay);
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return;
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}
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/* Finally, let's ensure we are hard enabled */
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__hard_irq_enable();
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}
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EXPORT_SYMBOL(arch_local_irq_restore);
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/*
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* This is specifically called by assembly code to re-enable interrupts
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* if they are currently disabled. This is typically called before
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* schedule() or do_signal() when returning to userspace. We do it
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* in C to avoid the burden of dealing with lockdep etc...
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*/
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void restore_interrupts(void)
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{
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if (irqs_disabled())
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local_irq_enable();
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}
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#endif /* CONFIG_PPC64 */
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int arch_show_interrupts(struct seq_file *p, int prec)
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{
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int j;
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#if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
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if (tau_initialized) {
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seq_printf(p, "%*s: ", prec, "TAU");
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for_each_online_cpu(j)
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seq_printf(p, "%10u ", tau_interrupts(j));
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seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n");
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}
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#endif /* CONFIG_PPC32 && CONFIG_TAU_INT */
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seq_printf(p, "%*s: ", prec, "LOC");
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for_each_online_cpu(j)
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seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs);
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seq_printf(p, " Local timer interrupts\n");
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seq_printf(p, "%*s: ", prec, "SPU");
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for_each_online_cpu(j)
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seq_printf(p, "%10u ", per_cpu(irq_stat, j).spurious_irqs);
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seq_printf(p, " Spurious interrupts\n");
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seq_printf(p, "%*s: ", prec, "CNT");
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for_each_online_cpu(j)
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seq_printf(p, "%10u ", per_cpu(irq_stat, j).pmu_irqs);
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seq_printf(p, " Performance monitoring interrupts\n");
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seq_printf(p, "%*s: ", prec, "MCE");
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for_each_online_cpu(j)
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seq_printf(p, "%10u ", per_cpu(irq_stat, j).mce_exceptions);
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seq_printf(p, " Machine check exceptions\n");
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return 0;
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}
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/*
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* /proc/stat helpers
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*/
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u64 arch_irq_stat_cpu(unsigned int cpu)
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{
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u64 sum = per_cpu(irq_stat, cpu).timer_irqs;
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sum += per_cpu(irq_stat, cpu).pmu_irqs;
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sum += per_cpu(irq_stat, cpu).mce_exceptions;
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sum += per_cpu(irq_stat, cpu).spurious_irqs;
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return sum;
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}
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#ifdef CONFIG_HOTPLUG_CPU
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void migrate_irqs(void)
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{
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struct irq_desc *desc;
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unsigned int irq;
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static int warned;
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cpumask_var_t mask;
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const struct cpumask *map = cpu_online_mask;
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alloc_cpumask_var(&mask, GFP_KERNEL);
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for_each_irq(irq) {
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struct irq_data *data;
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struct irq_chip *chip;
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desc = irq_to_desc(irq);
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if (!desc)
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continue;
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data = irq_desc_get_irq_data(desc);
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if (irqd_is_per_cpu(data))
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continue;
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chip = irq_data_get_irq_chip(data);
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cpumask_and(mask, data->affinity, map);
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if (cpumask_any(mask) >= nr_cpu_ids) {
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printk("Breaking affinity for irq %i\n", irq);
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cpumask_copy(mask, map);
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}
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if (chip->irq_set_affinity)
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chip->irq_set_affinity(data, mask, true);
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else if (desc->action && !(warned++))
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printk("Cannot set affinity for irq %i\n", irq);
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}
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free_cpumask_var(mask);
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local_irq_enable();
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mdelay(1);
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local_irq_disable();
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}
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#endif
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static inline void handle_one_irq(unsigned int irq)
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{
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struct thread_info *curtp, *irqtp;
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unsigned long saved_sp_limit;
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struct irq_desc *desc;
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desc = irq_to_desc(irq);
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if (!desc)
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return;
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/* Switch to the irq stack to handle this */
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curtp = current_thread_info();
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irqtp = hardirq_ctx[smp_processor_id()];
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if (curtp == irqtp) {
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/* We're already on the irq stack, just handle it */
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desc->handle_irq(irq, desc);
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return;
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}
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saved_sp_limit = current->thread.ksp_limit;
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irqtp->task = curtp->task;
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irqtp->flags = 0;
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/* Copy the softirq bits in preempt_count so that the
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* softirq checks work in the hardirq context. */
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irqtp->preempt_count = (irqtp->preempt_count & ~SOFTIRQ_MASK) |
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(curtp->preempt_count & SOFTIRQ_MASK);
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current->thread.ksp_limit = (unsigned long)irqtp +
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_ALIGN_UP(sizeof(struct thread_info), 16);
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call_handle_irq(irq, desc, irqtp, desc->handle_irq);
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current->thread.ksp_limit = saved_sp_limit;
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irqtp->task = NULL;
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/* Set any flag that may have been set on the
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* alternate stack
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*/
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if (irqtp->flags)
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set_bits(irqtp->flags, &curtp->flags);
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}
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static inline void check_stack_overflow(void)
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{
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#ifdef CONFIG_DEBUG_STACKOVERFLOW
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long sp;
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sp = __get_SP() & (THREAD_SIZE-1);
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/* check for stack overflow: is there less than 2KB free? */
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if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
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printk("do_IRQ: stack overflow: %ld\n",
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sp - sizeof(struct thread_info));
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dump_stack();
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}
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#endif
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}
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void do_IRQ(struct pt_regs *regs)
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{
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struct pt_regs *old_regs = set_irq_regs(regs);
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unsigned int irq;
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trace_irq_entry(regs);
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irq_enter();
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check_stack_overflow();
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/*
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* Query the platform PIC for the interrupt & ack it.
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*
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* This will typically lower the interrupt line to the CPU
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*/
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irq = ppc_md.get_irq();
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/* We can hard enable interrupts now */
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may_hard_irq_enable();
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/* And finally process it */
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if (irq != NO_IRQ && irq != NO_IRQ_IGNORE)
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handle_one_irq(irq);
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else if (irq != NO_IRQ_IGNORE)
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__get_cpu_var(irq_stat).spurious_irqs++;
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irq_exit();
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set_irq_regs(old_regs);
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#ifdef CONFIG_PPC_ISERIES
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if (firmware_has_feature(FW_FEATURE_ISERIES) &&
|
|
get_lppaca()->int_dword.fields.decr_int) {
|
|
get_lppaca()->int_dword.fields.decr_int = 0;
|
|
/* Signal a fake decrementer interrupt */
|
|
timer_interrupt(regs);
|
|
}
|
|
#endif
|
|
|
|
trace_irq_exit(regs);
|
|
}
|
|
|
|
void __init init_IRQ(void)
|
|
{
|
|
if (ppc_md.init_IRQ)
|
|
ppc_md.init_IRQ();
|
|
|
|
exc_lvl_ctx_init();
|
|
|
|
irq_ctx_init();
|
|
}
|
|
|
|
#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
|
|
struct thread_info *critirq_ctx[NR_CPUS] __read_mostly;
|
|
struct thread_info *dbgirq_ctx[NR_CPUS] __read_mostly;
|
|
struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly;
|
|
|
|
void exc_lvl_ctx_init(void)
|
|
{
|
|
struct thread_info *tp;
|
|
int i, cpu_nr;
|
|
|
|
for_each_possible_cpu(i) {
|
|
#ifdef CONFIG_PPC64
|
|
cpu_nr = i;
|
|
#else
|
|
cpu_nr = get_hard_smp_processor_id(i);
|
|
#endif
|
|
memset((void *)critirq_ctx[cpu_nr], 0, THREAD_SIZE);
|
|
tp = critirq_ctx[cpu_nr];
|
|
tp->cpu = cpu_nr;
|
|
tp->preempt_count = 0;
|
|
|
|
#ifdef CONFIG_BOOKE
|
|
memset((void *)dbgirq_ctx[cpu_nr], 0, THREAD_SIZE);
|
|
tp = dbgirq_ctx[cpu_nr];
|
|
tp->cpu = cpu_nr;
|
|
tp->preempt_count = 0;
|
|
|
|
memset((void *)mcheckirq_ctx[cpu_nr], 0, THREAD_SIZE);
|
|
tp = mcheckirq_ctx[cpu_nr];
|
|
tp->cpu = cpu_nr;
|
|
tp->preempt_count = HARDIRQ_OFFSET;
|
|
#endif
|
|
}
|
|
}
|
|
#endif
|
|
|
|
struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
|
|
struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
|
|
|
|
void irq_ctx_init(void)
|
|
{
|
|
struct thread_info *tp;
|
|
int i;
|
|
|
|
for_each_possible_cpu(i) {
|
|
memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
|
|
tp = softirq_ctx[i];
|
|
tp->cpu = i;
|
|
tp->preempt_count = 0;
|
|
|
|
memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
|
|
tp = hardirq_ctx[i];
|
|
tp->cpu = i;
|
|
tp->preempt_count = HARDIRQ_OFFSET;
|
|
}
|
|
}
|
|
|
|
static inline void do_softirq_onstack(void)
|
|
{
|
|
struct thread_info *curtp, *irqtp;
|
|
unsigned long saved_sp_limit = current->thread.ksp_limit;
|
|
|
|
curtp = current_thread_info();
|
|
irqtp = softirq_ctx[smp_processor_id()];
|
|
irqtp->task = curtp->task;
|
|
irqtp->flags = 0;
|
|
current->thread.ksp_limit = (unsigned long)irqtp +
|
|
_ALIGN_UP(sizeof(struct thread_info), 16);
|
|
call_do_softirq(irqtp);
|
|
current->thread.ksp_limit = saved_sp_limit;
|
|
irqtp->task = NULL;
|
|
|
|
/* Set any flag that may have been set on the
|
|
* alternate stack
|
|
*/
|
|
if (irqtp->flags)
|
|
set_bits(irqtp->flags, &curtp->flags);
|
|
}
|
|
|
|
void do_softirq(void)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (in_interrupt())
|
|
return;
|
|
|
|
local_irq_save(flags);
|
|
|
|
if (local_softirq_pending())
|
|
do_softirq_onstack();
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
|
|
/*
|
|
* IRQ controller and virtual interrupts
|
|
*/
|
|
|
|
/* The main irq map itself is an array of NR_IRQ entries containing the
|
|
* associate host and irq number. An entry with a host of NULL is free.
|
|
* An entry can be allocated if it's free, the allocator always then sets
|
|
* hwirq first to the host's invalid irq number and then fills ops.
|
|
*/
|
|
struct irq_map_entry {
|
|
irq_hw_number_t hwirq;
|
|
struct irq_host *host;
|
|
};
|
|
|
|
static LIST_HEAD(irq_hosts);
|
|
static DEFINE_RAW_SPINLOCK(irq_big_lock);
|
|
static DEFINE_MUTEX(revmap_trees_mutex);
|
|
static struct irq_map_entry irq_map[NR_IRQS];
|
|
static unsigned int irq_virq_count = NR_IRQS;
|
|
static struct irq_host *irq_default_host;
|
|
|
|
irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
|
|
{
|
|
return irq_map[d->irq].hwirq;
|
|
}
|
|
EXPORT_SYMBOL_GPL(irqd_to_hwirq);
|
|
|
|
irq_hw_number_t virq_to_hw(unsigned int virq)
|
|
{
|
|
return irq_map[virq].hwirq;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virq_to_hw);
|
|
|
|
bool virq_is_host(unsigned int virq, struct irq_host *host)
|
|
{
|
|
return irq_map[virq].host == host;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virq_is_host);
|
|
|
|
static int default_irq_host_match(struct irq_host *h, struct device_node *np)
|
|
{
|
|
return h->of_node != NULL && h->of_node == np;
|
|
}
|
|
|
|
struct irq_host *irq_alloc_host(struct device_node *of_node,
|
|
unsigned int revmap_type,
|
|
unsigned int revmap_arg,
|
|
struct irq_host_ops *ops,
|
|
irq_hw_number_t inval_irq)
|
|
{
|
|
struct irq_host *host;
|
|
unsigned int size = sizeof(struct irq_host);
|
|
unsigned int i;
|
|
unsigned int *rmap;
|
|
unsigned long flags;
|
|
|
|
/* Allocate structure and revmap table if using linear mapping */
|
|
if (revmap_type == IRQ_HOST_MAP_LINEAR)
|
|
size += revmap_arg * sizeof(unsigned int);
|
|
host = kzalloc(size, GFP_KERNEL);
|
|
if (host == NULL)
|
|
return NULL;
|
|
|
|
/* Fill structure */
|
|
host->revmap_type = revmap_type;
|
|
host->inval_irq = inval_irq;
|
|
host->ops = ops;
|
|
host->of_node = of_node_get(of_node);
|
|
|
|
if (host->ops->match == NULL)
|
|
host->ops->match = default_irq_host_match;
|
|
|
|
raw_spin_lock_irqsave(&irq_big_lock, flags);
|
|
|
|
/* If it's a legacy controller, check for duplicates and
|
|
* mark it as allocated (we use irq 0 host pointer for that
|
|
*/
|
|
if (revmap_type == IRQ_HOST_MAP_LEGACY) {
|
|
if (irq_map[0].host != NULL) {
|
|
raw_spin_unlock_irqrestore(&irq_big_lock, flags);
|
|
of_node_put(host->of_node);
|
|
kfree(host);
|
|
return NULL;
|
|
}
|
|
irq_map[0].host = host;
|
|
}
|
|
|
|
list_add(&host->link, &irq_hosts);
|
|
raw_spin_unlock_irqrestore(&irq_big_lock, flags);
|
|
|
|
/* Additional setups per revmap type */
|
|
switch(revmap_type) {
|
|
case IRQ_HOST_MAP_LEGACY:
|
|
/* 0 is always the invalid number for legacy */
|
|
host->inval_irq = 0;
|
|
/* setup us as the host for all legacy interrupts */
|
|
for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
|
|
irq_map[i].hwirq = i;
|
|
smp_wmb();
|
|
irq_map[i].host = host;
|
|
smp_wmb();
|
|
|
|
/* Legacy flags are left to default at this point,
|
|
* one can then use irq_create_mapping() to
|
|
* explicitly change them
|
|
*/
|
|
ops->map(host, i, i);
|
|
|
|
/* Clear norequest flags */
|
|
irq_clear_status_flags(i, IRQ_NOREQUEST);
|
|
}
|
|
break;
|
|
case IRQ_HOST_MAP_LINEAR:
|
|
rmap = (unsigned int *)(host + 1);
|
|
for (i = 0; i < revmap_arg; i++)
|
|
rmap[i] = NO_IRQ;
|
|
host->revmap_data.linear.size = revmap_arg;
|
|
smp_wmb();
|
|
host->revmap_data.linear.revmap = rmap;
|
|
break;
|
|
case IRQ_HOST_MAP_TREE:
|
|
INIT_RADIX_TREE(&host->revmap_data.tree, GFP_KERNEL);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
|
|
|
|
return host;
|
|
}
|
|
|
|
struct irq_host *irq_find_host(struct device_node *node)
|
|
{
|
|
struct irq_host *h, *found = NULL;
|
|
unsigned long flags;
|
|
|
|
/* We might want to match the legacy controller last since
|
|
* it might potentially be set to match all interrupts in
|
|
* the absence of a device node. This isn't a problem so far
|
|
* yet though...
|
|
*/
|
|
raw_spin_lock_irqsave(&irq_big_lock, flags);
|
|
list_for_each_entry(h, &irq_hosts, link)
|
|
if (h->ops->match(h, node)) {
|
|
found = h;
|
|
break;
|
|
}
|
|
raw_spin_unlock_irqrestore(&irq_big_lock, flags);
|
|
return found;
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_find_host);
|
|
|
|
void irq_set_default_host(struct irq_host *host)
|
|
{
|
|
pr_debug("irq: Default host set to @0x%p\n", host);
|
|
|
|
irq_default_host = host;
|
|
}
|
|
|
|
void irq_set_virq_count(unsigned int count)
|
|
{
|
|
pr_debug("irq: Trying to set virq count to %d\n", count);
|
|
|
|
BUG_ON(count < NUM_ISA_INTERRUPTS);
|
|
if (count < NR_IRQS)
|
|
irq_virq_count = count;
|
|
}
|
|
|
|
static int irq_setup_virq(struct irq_host *host, unsigned int virq,
|
|
irq_hw_number_t hwirq)
|
|
{
|
|
int res;
|
|
|
|
res = irq_alloc_desc_at(virq, 0);
|
|
if (res != virq) {
|
|
pr_debug("irq: -> allocating desc failed\n");
|
|
goto error;
|
|
}
|
|
|
|
/* map it */
|
|
smp_wmb();
|
|
irq_map[virq].hwirq = hwirq;
|
|
smp_mb();
|
|
|
|
if (host->ops->map(host, virq, hwirq)) {
|
|
pr_debug("irq: -> mapping failed, freeing\n");
|
|
goto errdesc;
|
|
}
|
|
|
|
irq_clear_status_flags(virq, IRQ_NOREQUEST);
|
|
|
|
return 0;
|
|
|
|
errdesc:
|
|
irq_free_descs(virq, 1);
|
|
error:
|
|
irq_free_virt(virq, 1);
|
|
return -1;
|
|
}
|
|
|
|
unsigned int irq_create_direct_mapping(struct irq_host *host)
|
|
{
|
|
unsigned int virq;
|
|
|
|
if (host == NULL)
|
|
host = irq_default_host;
|
|
|
|
BUG_ON(host == NULL);
|
|
WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP);
|
|
|
|
virq = irq_alloc_virt(host, 1, 0);
|
|
if (virq == NO_IRQ) {
|
|
pr_debug("irq: create_direct virq allocation failed\n");
|
|
return NO_IRQ;
|
|
}
|
|
|
|
pr_debug("irq: create_direct obtained virq %d\n", virq);
|
|
|
|
if (irq_setup_virq(host, virq, virq))
|
|
return NO_IRQ;
|
|
|
|
return virq;
|
|
}
|
|
|
|
unsigned int irq_create_mapping(struct irq_host *host,
|
|
irq_hw_number_t hwirq)
|
|
{
|
|
unsigned int virq, hint;
|
|
|
|
pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
|
|
|
|
/* Look for default host if nececssary */
|
|
if (host == NULL)
|
|
host = irq_default_host;
|
|
if (host == NULL) {
|
|
printk(KERN_WARNING "irq_create_mapping called for"
|
|
" NULL host, hwirq=%lx\n", hwirq);
|
|
WARN_ON(1);
|
|
return NO_IRQ;
|
|
}
|
|
pr_debug("irq: -> using host @%p\n", host);
|
|
|
|
/* Check if mapping already exists */
|
|
virq = irq_find_mapping(host, hwirq);
|
|
if (virq != NO_IRQ) {
|
|
pr_debug("irq: -> existing mapping on virq %d\n", virq);
|
|
return virq;
|
|
}
|
|
|
|
/* Get a virtual interrupt number */
|
|
if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
|
|
/* Handle legacy */
|
|
virq = (unsigned int)hwirq;
|
|
if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
|
|
return NO_IRQ;
|
|
return virq;
|
|
} else {
|
|
/* Allocate a virtual interrupt number */
|
|
hint = hwirq % irq_virq_count;
|
|
virq = irq_alloc_virt(host, 1, hint);
|
|
if (virq == NO_IRQ) {
|
|
pr_debug("irq: -> virq allocation failed\n");
|
|
return NO_IRQ;
|
|
}
|
|
}
|
|
|
|
if (irq_setup_virq(host, virq, hwirq))
|
|
return NO_IRQ;
|
|
|
|
pr_debug("irq: irq %lu on host %s mapped to virtual irq %u\n",
|
|
hwirq, host->of_node ? host->of_node->full_name : "null", virq);
|
|
|
|
return virq;
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_create_mapping);
|
|
|
|
unsigned int irq_create_of_mapping(struct device_node *controller,
|
|
const u32 *intspec, unsigned int intsize)
|
|
{
|
|
struct irq_host *host;
|
|
irq_hw_number_t hwirq;
|
|
unsigned int type = IRQ_TYPE_NONE;
|
|
unsigned int virq;
|
|
|
|
if (controller == NULL)
|
|
host = irq_default_host;
|
|
else
|
|
host = irq_find_host(controller);
|
|
if (host == NULL) {
|
|
printk(KERN_WARNING "irq: no irq host found for %s !\n",
|
|
controller->full_name);
|
|
return NO_IRQ;
|
|
}
|
|
|
|
/* If host has no translation, then we assume interrupt line */
|
|
if (host->ops->xlate == NULL)
|
|
hwirq = intspec[0];
|
|
else {
|
|
if (host->ops->xlate(host, controller, intspec, intsize,
|
|
&hwirq, &type))
|
|
return NO_IRQ;
|
|
}
|
|
|
|
/* Create mapping */
|
|
virq = irq_create_mapping(host, hwirq);
|
|
if (virq == NO_IRQ)
|
|
return virq;
|
|
|
|
/* Set type if specified and different than the current one */
|
|
if (type != IRQ_TYPE_NONE &&
|
|
type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
|
|
irq_set_irq_type(virq, type);
|
|
return virq;
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_create_of_mapping);
|
|
|
|
void irq_dispose_mapping(unsigned int virq)
|
|
{
|
|
struct irq_host *host;
|
|
irq_hw_number_t hwirq;
|
|
|
|
if (virq == NO_IRQ)
|
|
return;
|
|
|
|
host = irq_map[virq].host;
|
|
if (WARN_ON(host == NULL))
|
|
return;
|
|
|
|
/* Never unmap legacy interrupts */
|
|
if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
|
|
return;
|
|
|
|
irq_set_status_flags(virq, IRQ_NOREQUEST);
|
|
|
|
/* remove chip and handler */
|
|
irq_set_chip_and_handler(virq, NULL, NULL);
|
|
|
|
/* Make sure it's completed */
|
|
synchronize_irq(virq);
|
|
|
|
/* Tell the PIC about it */
|
|
if (host->ops->unmap)
|
|
host->ops->unmap(host, virq);
|
|
smp_mb();
|
|
|
|
/* Clear reverse map */
|
|
hwirq = irq_map[virq].hwirq;
|
|
switch(host->revmap_type) {
|
|
case IRQ_HOST_MAP_LINEAR:
|
|
if (hwirq < host->revmap_data.linear.size)
|
|
host->revmap_data.linear.revmap[hwirq] = NO_IRQ;
|
|
break;
|
|
case IRQ_HOST_MAP_TREE:
|
|
mutex_lock(&revmap_trees_mutex);
|
|
radix_tree_delete(&host->revmap_data.tree, hwirq);
|
|
mutex_unlock(&revmap_trees_mutex);
|
|
break;
|
|
}
|
|
|
|
/* Destroy map */
|
|
smp_mb();
|
|
irq_map[virq].hwirq = host->inval_irq;
|
|
|
|
irq_free_descs(virq, 1);
|
|
/* Free it */
|
|
irq_free_virt(virq, 1);
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_dispose_mapping);
|
|
|
|
unsigned int irq_find_mapping(struct irq_host *host,
|
|
irq_hw_number_t hwirq)
|
|
{
|
|
unsigned int i;
|
|
unsigned int hint = hwirq % irq_virq_count;
|
|
|
|
/* Look for default host if nececssary */
|
|
if (host == NULL)
|
|
host = irq_default_host;
|
|
if (host == NULL)
|
|
return NO_IRQ;
|
|
|
|
/* legacy -> bail early */
|
|
if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
|
|
return hwirq;
|
|
|
|
/* Slow path does a linear search of the map */
|
|
if (hint < NUM_ISA_INTERRUPTS)
|
|
hint = NUM_ISA_INTERRUPTS;
|
|
i = hint;
|
|
do {
|
|
if (irq_map[i].host == host &&
|
|
irq_map[i].hwirq == hwirq)
|
|
return i;
|
|
i++;
|
|
if (i >= irq_virq_count)
|
|
i = NUM_ISA_INTERRUPTS;
|
|
} while(i != hint);
|
|
return NO_IRQ;
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_find_mapping);
|
|
|
|
#ifdef CONFIG_SMP
|
|
int irq_choose_cpu(const struct cpumask *mask)
|
|
{
|
|
int cpuid;
|
|
|
|
if (cpumask_equal(mask, cpu_all_mask)) {
|
|
static int irq_rover;
|
|
static DEFINE_RAW_SPINLOCK(irq_rover_lock);
|
|
unsigned long flags;
|
|
|
|
/* Round-robin distribution... */
|
|
do_round_robin:
|
|
raw_spin_lock_irqsave(&irq_rover_lock, flags);
|
|
|
|
irq_rover = cpumask_next(irq_rover, cpu_online_mask);
|
|
if (irq_rover >= nr_cpu_ids)
|
|
irq_rover = cpumask_first(cpu_online_mask);
|
|
|
|
cpuid = irq_rover;
|
|
|
|
raw_spin_unlock_irqrestore(&irq_rover_lock, flags);
|
|
} else {
|
|
cpuid = cpumask_first_and(mask, cpu_online_mask);
|
|
if (cpuid >= nr_cpu_ids)
|
|
goto do_round_robin;
|
|
}
|
|
|
|
return get_hard_smp_processor_id(cpuid);
|
|
}
|
|
#else
|
|
int irq_choose_cpu(const struct cpumask *mask)
|
|
{
|
|
return hard_smp_processor_id();
|
|
}
|
|
#endif
|
|
|
|
unsigned int irq_radix_revmap_lookup(struct irq_host *host,
|
|
irq_hw_number_t hwirq)
|
|
{
|
|
struct irq_map_entry *ptr;
|
|
unsigned int virq;
|
|
|
|
if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_TREE))
|
|
return irq_find_mapping(host, hwirq);
|
|
|
|
/*
|
|
* The ptr returned references the static global irq_map.
|
|
* but freeing an irq can delete nodes along the path to
|
|
* do the lookup via call_rcu.
|
|
*/
|
|
rcu_read_lock();
|
|
ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq);
|
|
rcu_read_unlock();
|
|
|
|
/*
|
|
* If found in radix tree, then fine.
|
|
* Else fallback to linear lookup - this should not happen in practice
|
|
* as it means that we failed to insert the node in the radix tree.
|
|
*/
|
|
if (ptr)
|
|
virq = ptr - irq_map;
|
|
else
|
|
virq = irq_find_mapping(host, hwirq);
|
|
|
|
return virq;
|
|
}
|
|
|
|
void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
|
|
irq_hw_number_t hwirq)
|
|
{
|
|
if (WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE))
|
|
return;
|
|
|
|
if (virq != NO_IRQ) {
|
|
mutex_lock(&revmap_trees_mutex);
|
|
radix_tree_insert(&host->revmap_data.tree, hwirq,
|
|
&irq_map[virq]);
|
|
mutex_unlock(&revmap_trees_mutex);
|
|
}
|
|
}
|
|
|
|
unsigned int irq_linear_revmap(struct irq_host *host,
|
|
irq_hw_number_t hwirq)
|
|
{
|
|
unsigned int *revmap;
|
|
|
|
if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_LINEAR))
|
|
return irq_find_mapping(host, hwirq);
|
|
|
|
/* Check revmap bounds */
|
|
if (unlikely(hwirq >= host->revmap_data.linear.size))
|
|
return irq_find_mapping(host, hwirq);
|
|
|
|
/* Check if revmap was allocated */
|
|
revmap = host->revmap_data.linear.revmap;
|
|
if (unlikely(revmap == NULL))
|
|
return irq_find_mapping(host, hwirq);
|
|
|
|
/* Fill up revmap with slow path if no mapping found */
|
|
if (unlikely(revmap[hwirq] == NO_IRQ))
|
|
revmap[hwirq] = irq_find_mapping(host, hwirq);
|
|
|
|
return revmap[hwirq];
|
|
}
|
|
|
|
unsigned int irq_alloc_virt(struct irq_host *host,
|
|
unsigned int count,
|
|
unsigned int hint)
|
|
{
|
|
unsigned long flags;
|
|
unsigned int i, j, found = NO_IRQ;
|
|
|
|
if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
|
|
return NO_IRQ;
|
|
|
|
raw_spin_lock_irqsave(&irq_big_lock, flags);
|
|
|
|
/* Use hint for 1 interrupt if any */
|
|
if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
|
|
hint < irq_virq_count && irq_map[hint].host == NULL) {
|
|
found = hint;
|
|
goto hint_found;
|
|
}
|
|
|
|
/* Look for count consecutive numbers in the allocatable
|
|
* (non-legacy) space
|
|
*/
|
|
for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
|
|
if (irq_map[i].host != NULL)
|
|
j = 0;
|
|
else
|
|
j++;
|
|
|
|
if (j == count) {
|
|
found = i - count + 1;
|
|
break;
|
|
}
|
|
}
|
|
if (found == NO_IRQ) {
|
|
raw_spin_unlock_irqrestore(&irq_big_lock, flags);
|
|
return NO_IRQ;
|
|
}
|
|
hint_found:
|
|
for (i = found; i < (found + count); i++) {
|
|
irq_map[i].hwirq = host->inval_irq;
|
|
smp_wmb();
|
|
irq_map[i].host = host;
|
|
}
|
|
raw_spin_unlock_irqrestore(&irq_big_lock, flags);
|
|
return found;
|
|
}
|
|
|
|
void irq_free_virt(unsigned int virq, unsigned int count)
|
|
{
|
|
unsigned long flags;
|
|
unsigned int i;
|
|
|
|
WARN_ON (virq < NUM_ISA_INTERRUPTS);
|
|
WARN_ON (count == 0 || (virq + count) > irq_virq_count);
|
|
|
|
if (virq < NUM_ISA_INTERRUPTS) {
|
|
if (virq + count < NUM_ISA_INTERRUPTS)
|
|
return;
|
|
count =- NUM_ISA_INTERRUPTS - virq;
|
|
virq = NUM_ISA_INTERRUPTS;
|
|
}
|
|
|
|
if (count > irq_virq_count || virq > irq_virq_count - count) {
|
|
if (virq > irq_virq_count)
|
|
return;
|
|
count = irq_virq_count - virq;
|
|
}
|
|
|
|
raw_spin_lock_irqsave(&irq_big_lock, flags);
|
|
for (i = virq; i < (virq + count); i++) {
|
|
struct irq_host *host;
|
|
|
|
host = irq_map[i].host;
|
|
irq_map[i].hwirq = host->inval_irq;
|
|
smp_wmb();
|
|
irq_map[i].host = NULL;
|
|
}
|
|
raw_spin_unlock_irqrestore(&irq_big_lock, flags);
|
|
}
|
|
|
|
int arch_early_irq_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_VIRQ_DEBUG
|
|
static int virq_debug_show(struct seq_file *m, void *private)
|
|
{
|
|
unsigned long flags;
|
|
struct irq_desc *desc;
|
|
const char *p;
|
|
static const char none[] = "none";
|
|
void *data;
|
|
int i;
|
|
|
|
seq_printf(m, "%-5s %-7s %-15s %-18s %s\n", "virq", "hwirq",
|
|
"chip name", "chip data", "host name");
|
|
|
|
for (i = 1; i < nr_irqs; i++) {
|
|
desc = irq_to_desc(i);
|
|
if (!desc)
|
|
continue;
|
|
|
|
raw_spin_lock_irqsave(&desc->lock, flags);
|
|
|
|
if (desc->action && desc->action->handler) {
|
|
struct irq_chip *chip;
|
|
|
|
seq_printf(m, "%5d ", i);
|
|
seq_printf(m, "0x%05lx ", irq_map[i].hwirq);
|
|
|
|
chip = irq_desc_get_chip(desc);
|
|
if (chip && chip->name)
|
|
p = chip->name;
|
|
else
|
|
p = none;
|
|
seq_printf(m, "%-15s ", p);
|
|
|
|
data = irq_desc_get_chip_data(desc);
|
|
seq_printf(m, "0x%16p ", data);
|
|
|
|
if (irq_map[i].host && irq_map[i].host->of_node)
|
|
p = irq_map[i].host->of_node->full_name;
|
|
else
|
|
p = none;
|
|
seq_printf(m, "%s\n", p);
|
|
}
|
|
|
|
raw_spin_unlock_irqrestore(&desc->lock, flags);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int virq_debug_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, virq_debug_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations virq_debug_fops = {
|
|
.open = virq_debug_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int __init irq_debugfs_init(void)
|
|
{
|
|
if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
|
|
NULL, &virq_debug_fops) == NULL)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
__initcall(irq_debugfs_init);
|
|
#endif /* CONFIG_VIRQ_DEBUG */
|
|
|
|
#ifdef CONFIG_PPC64
|
|
static int __init setup_noirqdistrib(char *str)
|
|
{
|
|
distribute_irqs = 0;
|
|
return 1;
|
|
}
|
|
|
|
__setup("noirqdistrib", setup_noirqdistrib);
|
|
#endif /* CONFIG_PPC64 */
|