cregit-Linux how code gets into the kernel

Release 4.14 arch/sparc/kernel/irq_32.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Interrupt request handling routines. On the
 * Sparc the IRQs are basically 'cast in stone'
 * and you are supposed to probe the prom's device
 * node trees to find out who's got which IRQ.
 *
 *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 *  Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
 *  Copyright (C) 1995,2002 Pete A. Zaitcev (zaitcev@yahoo.com)
 *  Copyright (C) 1996 Dave Redman (djhr@tadpole.co.uk)
 *  Copyright (C) 1998-2000 Anton Blanchard (anton@samba.org)
 */

#include <linux/kernel_stat.h>
#include <linux/seq_file.h>
#include <linux/export.h>

#include <asm/cacheflush.h>
#include <asm/cpudata.h>
#include <asm/setup.h>
#include <asm/pcic.h>
#include <asm/leon.h>

#include "kernel.h"
#include "irq.h"

/* platform specific irq setup */

struct sparc_config sparc_config;


unsigned long arch_local_irq_save(void) { unsigned long retval; unsigned long tmp; __asm__ __volatile__( "rd %%psr, %0\n\t" "or %0, %2, %1\n\t" "wr %1, 0, %%psr\n\t" "nop; nop; nop\n" : "=&r" (retval), "=r" (tmp) : "i" (PSR_PIL) : "memory"); return retval; }

Contributors

PersonTokensPropCommitsCommitProp
Keith M. Wesolowski2090.91%133.33%
David Howells14.55%133.33%
David S. Miller14.55%133.33%
Total22100.00%3100.00%

EXPORT_SYMBOL(arch_local_irq_save);
void arch_local_irq_enable(void) { unsigned long tmp; __asm__ __volatile__( "rd %%psr, %0\n\t" "andn %0, %1, %0\n\t" "wr %0, 0, %%psr\n\t" "nop; nop; nop\n" : "=&r" (tmp) : "i" (PSR_PIL) : "memory"); }

Contributors

PersonTokensPropCommitsCommitProp
Keith M. Wesolowski1285.71%133.33%
David S. Miller17.14%133.33%
David Howells17.14%133.33%
Total14100.00%3100.00%

EXPORT_SYMBOL(arch_local_irq_enable);
void arch_local_irq_restore(unsigned long old_psr) { unsigned long tmp; __asm__ __volatile__( "rd %%psr, %0\n\t" "and %2, %1, %2\n\t" "andn %0, %1, %0\n\t" "wr %0, %2, %%psr\n\t" "nop; nop; nop\n" : "=&r" (tmp) : "i" (PSR_PIL), "r" (old_psr) : "memory"); }

Contributors

PersonTokensPropCommitsCommitProp
Keith M. Wesolowski1487.50%133.33%
David S. Miller16.25%133.33%
David Howells16.25%133.33%
Total16100.00%3100.00%

EXPORT_SYMBOL(arch_local_irq_restore); /* * Dave Redman (djhr@tadpole.co.uk) * * IRQ numbers.. These are no longer restricted to 15.. * * this is done to enable SBUS cards and onboard IO to be masked * correctly. using the interrupt level isn't good enough. * * For example: * A device interrupting at sbus level6 and the Floppy both come in * at IRQ11, but enabling and disabling them requires writing to * different bits in the SLAVIO/SEC. * * As a result of these changes sun4m machines could now support * directed CPU interrupts using the existing enable/disable irq code * with tweaks. * * Sun4d complicates things even further. IRQ numbers are arbitrary * 32-bit values in that case. Since this is similar to sparc64, * we adopt a virtual IRQ numbering scheme as is done there. * Virutal interrupt numbers are allocated by build_irq(). So NR_IRQS * just becomes a limit of how many interrupt sources we can handle in * a single system. Even fully loaded SS2000 machines top off at * about 32 interrupt sources or so, therefore a NR_IRQS value of 64 * is more than enough. * * We keep a map of per-PIL enable interrupts. These get wired * up via the irq_chip->startup() method which gets invoked by * the generic IRQ layer during request_irq(). */ /* Table of allocated irqs. Unused entries has irq == 0 */ static struct irq_bucket irq_table[NR_IRQS]; /* Protect access to irq_table */ static DEFINE_SPINLOCK(irq_table_lock); /* Map between the irq identifier used in hw to the irq_bucket. */ struct irq_bucket *irq_map[SUN4D_MAX_IRQ]; /* Protect access to irq_map */ static DEFINE_SPINLOCK(irq_map_lock); /* Allocate a new irq from the irq_table */
unsigned int irq_alloc(unsigned int real_irq, unsigned int pil) { unsigned long flags; unsigned int i; spin_lock_irqsave(&irq_table_lock, flags); for (i = 1; i < NR_IRQS; i++) { if (irq_table[i].real_irq == real_irq && irq_table[i].pil == pil) goto found; } for (i = 1; i < NR_IRQS; i++) { if (!irq_table[i].irq) break; } if (i < NR_IRQS) { irq_table[i].real_irq = real_irq; irq_table[i].irq = i; irq_table[i].pil = pil; } else { printk(KERN_ERR "IRQ: Out of virtual IRQs.\n"); i = 0; } found: spin_unlock_irqrestore(&irq_table_lock, flags); return i; }

Contributors

PersonTokensPropCommitsCommitProp
Sam Ravnborg9863.23%18.33%
Linus Torvalds (pre-git)2918.71%433.33%
Andrew Morton127.74%325.00%
Keith M. Wesolowski117.10%18.33%
Bob Breuer31.94%18.33%
Linus Torvalds10.65%18.33%
Pete Zaitcev10.65%18.33%
Total155100.00%12100.00%

/* Based on a single pil handler_irq may need to call several * interrupt handlers. Use irq_map as entry to irq_table, * and let each entry in irq_table point to the next entry. */
void irq_link(unsigned int irq) { struct irq_bucket *p; unsigned long flags; unsigned int pil; BUG_ON(irq >= NR_IRQS); spin_lock_irqsave(&irq_map_lock, flags); p = &irq_table[irq]; pil = p->pil; BUG_ON(pil >= SUN4D_MAX_IRQ); p->next = irq_map[pil]; irq_map[pil] = p; spin_unlock_irqrestore(&irq_map_lock, flags); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3745.12%763.64%
Sam Ravnborg2935.37%19.09%
Keith M. Wesolowski1012.20%19.09%
Bob Breuer56.10%19.09%
Dan Carpenter11.22%19.09%
Total82100.00%11100.00%


void irq_unlink(unsigned int irq) { struct irq_bucket *p, **pnext; unsigned long flags; BUG_ON(irq >= NR_IRQS); spin_lock_irqsave(&irq_map_lock, flags); p = &irq_table[irq]; BUG_ON(p->pil >= SUN4D_MAX_IRQ); pnext = &irq_map[p->pil]; while (*pnext != p) pnext = &(*pnext)->next; *pnext = p->next; spin_unlock_irqrestore(&irq_map_lock, flags); }

Contributors

PersonTokensPropCommitsCommitProp
Sam Ravnborg6971.88%114.29%
Keith M. Wesolowski1616.67%114.29%
Linus Torvalds (pre-git)88.33%342.86%
Bob Breuer22.08%114.29%
Dan Carpenter11.04%114.29%
Total96100.00%7100.00%

/* /proc/interrupts printing */
int arch_show_interrupts(struct seq_file *p, int prec) { int j; #ifdef CONFIG_SMP seq_printf(p, "RES: "); for_each_online_cpu(j) seq_printf(p, "%10u ", cpu_data(j).irq_resched_count); seq_printf(p, " IPI rescheduling interrupts\n"); seq_printf(p, "CAL: "); for_each_online_cpu(j) seq_printf(p, "%10u ", cpu_data(j).irq_call_count); seq_printf(p, " IPI function call interrupts\n"); #endif seq_printf(p, "NMI: "); for_each_online_cpu(j) seq_printf(p, "%10u ", cpu_data(j).counter); seq_printf(p, " Non-maskable interrupts\n"); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Hellstrom6957.50%110.00%
Sam Ravnborg2924.17%110.00%
Linus Torvalds (pre-git)1915.83%660.00%
Bob Breuer21.67%110.00%
Keith M. Wesolowski10.83%110.00%
Total120100.00%10100.00%


void handler_irq(unsigned int pil, struct pt_regs *regs) { struct pt_regs *old_regs; struct irq_bucket *p; BUG_ON(pil > 15); old_regs = set_irq_regs(regs); irq_enter(); p = irq_map[pil]; while (p) { struct irq_bucket *next = p->next; generic_handle_irq(p->irq); p = next; } irq_exit(); set_irq_regs(old_regs); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3340.24%1066.67%
Sam Ravnborg2935.37%213.33%
Al Viro1720.73%16.67%
Linus Torvalds22.44%16.67%
Pete Zaitcev11.22%16.67%
Total82100.00%15100.00%

#if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE) static unsigned int floppy_irq;
int sparc_floppy_request_irq(unsigned int irq, irq_handler_t irq_handler) { unsigned int cpu_irq; int err; err = request_irq(irq, irq_handler, 0, "floppy", NULL); if (err) return -1; /* Save for later use in floppy interrupt handler */ floppy_irq = irq; cpu_irq = (irq & (NR_IRQS - 1)); /* Dork with trap table if we get this far. */ #define INSTANTIATE(table) \ table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_one = SPARC_RD_PSR_L0; \ table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two = \ SPARC_BRANCH((unsigned long) floppy_hardint, \ (unsigned long) &table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two);\ table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_three = SPARC_RD_WIM_L3; \ table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_four = SPARC_NOP; INSTANTIATE(sparc_ttable) #if defined CONFIG_SMP if (sparc_cpu_model != sparc_leon) { struct tt_entry *trap_table; trap_table = &trapbase_cpu1; INSTANTIATE(trap_table) trap_table = &trapbase_cpu2; INSTANTIATE(trap_table) trap_table = &trapbase_cpu3; INSTANTIATE(trap_table) } #endif #undef INSTANTIATE /* * XXX Correct thing whould be to flush only I- and D-cache lines * which contain the handler in question. But as of time of the * writing we have no CPU-neutral interface to fine-grained flushes. */ flush_cache_all(); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Sam Ravnborg7760.16%220.00%
Linus Torvalds (pre-git)4232.81%770.00%
Keith M. Wesolowski97.03%110.00%
Total128100.00%10100.00%

EXPORT_SYMBOL(sparc_floppy_request_irq); /* * These variables are used to access state from the assembler * interrupt handler, floppy_hardint, so we cannot put these in * the floppy driver image because that would not work in the * modular case. */ volatile unsigned char *fdc_status; EXPORT_SYMBOL(fdc_status); char *pdma_vaddr; EXPORT_SYMBOL(pdma_vaddr); unsigned long pdma_size; EXPORT_SYMBOL(pdma_size); volatile int doing_pdma; EXPORT_SYMBOL(doing_pdma); char *pdma_base; EXPORT_SYMBOL(pdma_base); unsigned long pdma_areasize; EXPORT_SYMBOL(pdma_areasize); /* Use the generic irq support to call floppy_interrupt * which was setup using request_irq() in sparc_floppy_request_irq(). * We only have one floppy interrupt so we do not need to check * for additional handlers being wired up by irq_link() */
void sparc_floppy_irq(int irq, void *dev_id, struct pt_regs *regs) { struct pt_regs *old_regs; old_regs = set_irq_regs(regs); irq_enter(); generic_handle_irq(floppy_irq); irq_exit(); set_irq_regs(old_regs); }

Contributors

PersonTokensPropCommitsCommitProp
Sam Ravnborg45100.00%2100.00%
Total45100.00%2100.00%

#endif /* djhr * This could probably be made indirect too and assigned in the CPU * bits of the code. That would be much nicer I think and would also * fit in with the idea of being able to tune your kernel for your machine * by removing unrequired machine and device support. * */
void __init init_IRQ(void) { switch (sparc_cpu_model) { case sun4m: pcic_probe(); if (pcic_present()) sun4m_pci_init_IRQ(); else sun4m_init_IRQ(); break; case sun4d: sun4d_init_IRQ(); break; case sparc_leon: leon_init_IRQ(); break; default: prom_printf("Cannot initialize IRQs on this Sun machine..."); break; } }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4583.33%872.73%
Konrad Eisele712.96%19.09%
Simon Arlott11.85%19.09%
Sam Ravnborg11.85%19.09%
Total54100.00%11100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Sam Ravnborg45746.44%1118.64%
Linus Torvalds (pre-git)23223.58%2338.98%
Keith M. Wesolowski979.86%23.39%
Daniel Hellstrom697.01%11.69%
Al Viro373.76%35.08%
David Howells141.42%11.69%
Andrew Morton121.22%35.08%
Bob Breuer121.22%11.69%
Arnaldo Carvalho de Melo121.22%11.69%
Konrad Eisele101.02%11.69%
David S. Miller101.02%23.39%
Linus Torvalds60.61%23.39%
Pete Zaitcev40.41%23.39%
Thomas Gleixner40.41%11.69%
Paul Gortmaker30.30%11.69%
Dan Carpenter20.20%11.69%
Greg Kroah-Hartman10.10%11.69%
Adrian Bunk10.10%11.69%
Simon Arlott10.10%11.69%
Total984100.00%59100.00%
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