* Copyright (C) 1994, 1995, 1996, 1997, 1998 Ralf Baechle
* Copyright (C) 1999 SuSE GmbH (Philipp Rumpf, prumpf@tux.org)
* Copyright (C) 1999-2000 Grant Grundler
+ * Copyright (c) 2005 Matthew Wilcox
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
*/
#include <linux/bitops.h>
#include <linux/config.h>
-#include <linux/eisa.h>
#include <linux/errno.h>
#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/signal.h>
-#include <linux/types.h>
-#include <linux/ioport.h>
-#include <linux/timex.h>
-#include <linux/slab.h>
-#include <linux/random.h>
-#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
-#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/spinlock.h>
+#include <linux/types.h>
-#include <asm/cache.h>
-#include <asm/pdc.h>
-
-#undef DEBUG_IRQ
#undef PARISC_IRQ_CR16_COUNTS
extern irqreturn_t timer_interrupt(int, void *, struct pt_regs *);
extern irqreturn_t ipi_interrupt(int, void *, struct pt_regs *);
-#ifdef DEBUG_IRQ
-#define DBG_IRQ(irq, x) if ((irq) != TIMER_IRQ) printk x
-#else /* DEBUG_IRQ */
-#define DBG_IRQ(irq, x) do { } while (0)
-#endif /* DEBUG_IRQ */
-
#define EIEM_MASK(irq) (1UL<<(CPU_IRQ_MAX - irq))
/* Bits in EIEM correlate with cpu_irq_action[].
}
if (i < NR_IRQS) {
+ struct irqaction *action;
+
spin_lock_irqsave(&irq_desc[i].lock, flags);
- struct irqaction *action = irq_desc[i].action;
+ action = irq_desc[i].action;
if (!action)
goto skip;
seq_printf(p, "%3d: ", i);
return cpu_claim_irq(irq, NULL, NULL) ? -1 : irq;
}
-int txn_alloc_irq(void)
+/*
+ * The bits_wide parameter accommodates the limitations of the HW/SW which
+ * use these bits:
+ * Legacy PA I/O (GSC/NIO): 5 bits (architected EIM register)
+ * V-class (EPIC): 6 bits
+ * N/L/A-class (iosapic): 8 bits
+ * PCI 2.2 MSI: 16 bits
+ * Some PCI devices: 32 bits (Symbios SCSI/ATM/HyperFabric)
+ *
+ * On the service provider side:
+ * o PA 1.1 (and PA2.0 narrow mode) 5-bits (width of EIR register)
+ * o PA 2.0 wide mode 6-bits (per processor)
+ * o IA64 8-bits (0-256 total)
+ *
+ * So a Legacy PA I/O device on a PA 2.0 box can't use all the bits supported
+ * by the processor...and the N/L-class I/O subsystem supports more bits than
+ * PA2.0 has. The first case is the problem.
+ */
+int txn_alloc_irq(unsigned int bits_wide)
{
int irq;
for (irq = CPU_IRQ_BASE + 1; irq <= CPU_IRQ_MAX; irq++) {
if (cpu_claim_irq(irq, NULL, NULL) < 0)
continue;
+ if ((irq - CPU_IRQ_BASE) >= (1 << bits_wide))
+ continue;
return irq;
}
return -1;
}
-unsigned long txn_alloc_addr(int virt_irq)
+unsigned long txn_alloc_addr(unsigned int virt_irq)
{
static int next_cpu = -1;
}
-/*
-** The alloc process needs to accept a parameter to accommodate limitations
-** of the HW/SW which use these bits:
-** Legacy PA I/O (GSC/NIO): 5 bits (architected EIM register)
-** V-class (EPIC): 6 bits
-** N/L-class/A500: 8 bits (iosapic)
-** PCI 2.2 MSI: 16 bits (I think)
-** Existing PCI devices: 32-bits (all Symbios SCSI/ATM/HyperFabric)
-**
-** On the service provider side:
-** o PA 1.1 (and PA2.0 narrow mode) 5-bits (width of EIR register)
-** o PA 2.0 wide mode 6-bits (per processor)
-** o IA64 8-bits (0-256 total)
-**
-** So a Legacy PA I/O device on a PA 2.0 box can't use all
-** the bits supported by the processor...and the N/L-class
-** I/O subsystem supports more bits than PA2.0 has. The first
-** case is the problem.
-*/
-unsigned int txn_alloc_data(int virt_irq, unsigned int bits_wide)
+unsigned int txn_alloc_data(unsigned int virt_irq)
{
- /* XXX FIXME : bits_wide indicates how wide the transaction
- ** data is allowed to be...we may need a different virt_irq
- ** if this one won't work. Another reason to index virtual
- ** irq's into a table which can manage CPU/IRQ bit separately.
- */
- if ((virt_irq - CPU_IRQ_BASE) > (1 << (bits_wide - 1))) {
- panic("Sorry -- didn't allocate valid IRQ for this device\n");
- }
-
return virt_irq - CPU_IRQ_BASE;
}
void do_cpu_irq_mask(struct pt_regs *regs)
{
unsigned long eirr_val;
- unsigned int i=3; /* limit time in interrupt context */
+
+ irq_enter();
/*
- * PSW_I or EIEM bits cannot be enabled until after the
- * interrupts are processed.
- * timer_interrupt() assumes it won't get interrupted when it
- * holds the xtime_lock...an unmasked interrupt source could
- * interrupt and deadlock by trying to grab xtime_lock too.
- * Keeping PSW_I and EIEM disabled avoids this.
+ * Only allow interrupt processing to be interrupted by the
+ * timer tick
*/
- set_eiem(0UL); /* disable all extr interrupt for now */
+ set_eiem(EIEM_MASK(TIMER_IRQ));
/* 1) only process IRQs that are enabled/unmasked (cpu_eiem)
* 2) We loop here on EIRR contents in order to avoid
* nested interrupts or having to take another interrupt
* when we could have just handled it right away.
- * 3) Limit the number of times we loop to make sure other
- * processing can occur.
*/
for (;;) {
unsigned long bit = (1UL << (BITS_PER_LONG - 1));
unsigned int irq;
eirr_val = mfctl(23) & cpu_eiem;
- if (!eirr_val || !i--)
+ if (!eirr_val)
break;
- mtctl(eirr_val, 23); /* reset bits we are going to process */
+ if (eirr_val & EIEM_MASK(TIMER_IRQ))
+ set_eiem(0);
-#ifdef DEBUG_IRQ
- if (eirr_val != (1UL << MAX_CPU_IRQ))
- printk(KERN_DEBUG "do_cpu_irq_mask 0x%x & 0x%x\n", eirr_val, cpu_eiem);
-#endif
+ mtctl(eirr_val, 23); /* reset bits we are going to process */
/* Work our way from MSb to LSb...same order we alloc EIRs */
for (irq = TIMER_IRQ; eirr_val && bit; bit>>=1, irq++) {
- if (!(bit & eirr_val & cpu_eiem))
+ if (!(bit & eirr_val))
continue;
/* clear bit in mask - can exit loop sooner */
}
}
set_eiem(cpu_eiem);
+ irq_exit();
}
git://git.onelab.eu / linux-2.6.git / blobdiff