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3e4c9102e0
Some Alpha platform locks are used as low-level hardware serialization locks in interrupt-controller and chipset access paths. These paths can run while IRQ state is being changed or while lockdep is tracking that state, so regular spinlock instrumentation is not appropriate once lockdep is enabled. Convert the affected Tsunami and Rawhide platform locks to raw_spinlock_t. This keeps the locks as simple hardware serialization locks and avoids lockdep recursion or IRQ-state mismatches when CONFIG_PROVE_LOCKING is enabled. This is a preparatory change for enabling lockdep hardirq state tracking on Alpha. Reviewed-by: Matt Turner <mattst88@gmail.com> Tested-by: Matt Turner <mattst88@gmail.com> Signed-off-by: Magnus Lindholm <linmag7@gmail.com> Link: https://lore.kernel.org/r/20260706170019.2941459-6-linmag7@gmail.com Signed-off-by: Magnus Lindholm <linmag7@gmail.com>
275 lines
6.6 KiB
C
275 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/alpha/kernel/sys_rawhide.c
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*
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* Copyright (C) 1995 David A Rusling
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* Copyright (C) 1996 Jay A Estabrook
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* Copyright (C) 1998, 1999 Richard Henderson
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*
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* Code supporting the RAWHIDE.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <asm/ptrace.h>
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#include <asm/dma.h>
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#include <asm/irq.h>
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#include <asm/mmu_context.h>
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#include <asm/io.h>
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#include <asm/core_mcpcia.h>
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#include <asm/tlbflush.h>
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#include "proto.h"
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#include "irq_impl.h"
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#include "pci_impl.h"
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#include "machvec_impl.h"
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/*
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* HACK ALERT! only the boot cpu is used for interrupts.
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*/
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/* Note mask bit is true for ENABLED irqs. */
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static unsigned int hose_irq_masks[4] = {
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0xff0000, 0xfe0000, 0xff0000, 0xff0000
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};
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static unsigned int cached_irq_masks[4];
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DEFINE_RAW_SPINLOCK(rawhide_irq_lock);
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static inline void
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rawhide_update_irq_hw(int hose, int mask)
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{
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*(vuip)MCPCIA_INT_MASK0(MCPCIA_HOSE2MID(hose)) = mask;
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mb();
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*(vuip)MCPCIA_INT_MASK0(MCPCIA_HOSE2MID(hose));
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}
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#define hose_exists(h) \
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(((h) < MCPCIA_MAX_HOSES) && (cached_irq_masks[(h)] != 0))
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static inline void
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rawhide_enable_irq(struct irq_data *d)
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{
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unsigned int mask, hose;
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unsigned int irq = d->irq;
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unsigned long flags;
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irq -= 16;
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hose = irq / 24;
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if (!hose_exists(hose)) /* if hose non-existent, exit */
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return;
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irq -= hose * 24;
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mask = 1 << irq;
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raw_spin_lock_irqsave(&rawhide_irq_lock, flags);
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mask |= cached_irq_masks[hose];
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cached_irq_masks[hose] = mask;
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rawhide_update_irq_hw(hose, mask);
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raw_spin_unlock_irqrestore(&rawhide_irq_lock, flags);
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}
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static void
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rawhide_disable_irq(struct irq_data *d)
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{
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unsigned int mask, hose;
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unsigned int irq = d->irq;
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unsigned long flags;
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irq -= 16;
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hose = irq / 24;
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if (!hose_exists(hose)) /* if hose non-existent, exit */
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return;
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irq -= hose * 24;
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mask = ~(1 << irq) | hose_irq_masks[hose];
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raw_spin_lock_irqsave(&rawhide_irq_lock, flags);
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mask &= cached_irq_masks[hose];
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cached_irq_masks[hose] = mask;
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rawhide_update_irq_hw(hose, mask);
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raw_spin_unlock_irqrestore(&rawhide_irq_lock, flags);
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}
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static void
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rawhide_mask_and_ack_irq(struct irq_data *d)
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{
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unsigned int mask, mask1, hose;
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unsigned int irq = d->irq;
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unsigned long flags;
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irq -= 16;
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hose = irq / 24;
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if (!hose_exists(hose)) /* if hose non-existent, exit */
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return;
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irq -= hose * 24;
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mask1 = 1 << irq;
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mask = ~mask1 | hose_irq_masks[hose];
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raw_spin_lock_irqsave(&rawhide_irq_lock, flags);
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mask &= cached_irq_masks[hose];
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cached_irq_masks[hose] = mask;
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rawhide_update_irq_hw(hose, mask);
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/* Clear the interrupt. */
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*(vuip)MCPCIA_INT_REQ(MCPCIA_HOSE2MID(hose)) = mask1;
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raw_spin_unlock_irqrestore(&rawhide_irq_lock, flags);
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}
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static struct irq_chip rawhide_irq_type = {
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.name = "RAWHIDE",
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.irq_unmask = rawhide_enable_irq,
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.irq_mask = rawhide_disable_irq,
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.irq_mask_ack = rawhide_mask_and_ack_irq,
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};
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static void
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rawhide_srm_device_interrupt(unsigned long vector)
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{
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int irq;
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irq = (vector - 0x800) >> 4;
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/*
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* The RAWHIDE SRM console reports PCI interrupts with a vector
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* 0x80 *higher* than one might expect, as PCI IRQ 0 (ie bit 0)
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* shows up as IRQ 24, etc, etc. We adjust it down by 8 to have
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* it line up with the actual bit numbers from the REQ registers,
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* which is how we manage the interrupts/mask. Sigh...
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*
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* Also, PCI #1 interrupts are offset some more... :-(
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*/
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if (irq == 52) {
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/* SCSI on PCI1 is special. */
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irq = 72;
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}
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/* Adjust by which hose it is from. */
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irq -= ((irq + 16) >> 2) & 0x38;
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handle_irq(irq);
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}
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static void __init
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rawhide_init_irq(void)
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{
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struct pci_controller *hose;
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long i;
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mcpcia_init_hoses();
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/* Clear them all; only hoses that exist will be non-zero. */
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for (i = 0; i < MCPCIA_MAX_HOSES; i++) cached_irq_masks[i] = 0;
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for (hose = hose_head; hose; hose = hose->next) {
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unsigned int h = hose->index;
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unsigned int mask = hose_irq_masks[h];
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cached_irq_masks[h] = mask;
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*(vuip)MCPCIA_INT_MASK0(MCPCIA_HOSE2MID(h)) = mask;
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*(vuip)MCPCIA_INT_MASK1(MCPCIA_HOSE2MID(h)) = 0;
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}
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for (i = 16; i < 128; ++i) {
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irq_set_chip_and_handler(i, &rawhide_irq_type,
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handle_level_irq);
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irq_set_status_flags(i, IRQ_LEVEL);
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}
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init_i8259a_irqs();
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common_init_isa_dma();
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}
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/*
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* PCI Fixup configuration.
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*
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* Summary @ MCPCIA_PCI0_INT_REQ:
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* Bit Meaning
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* 0 Interrupt Line A from slot 2 PCI0
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* 1 Interrupt Line B from slot 2 PCI0
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* 2 Interrupt Line C from slot 2 PCI0
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* 3 Interrupt Line D from slot 2 PCI0
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* 4 Interrupt Line A from slot 3 PCI0
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* 5 Interrupt Line B from slot 3 PCI0
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* 6 Interrupt Line C from slot 3 PCI0
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* 7 Interrupt Line D from slot 3 PCI0
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* 8 Interrupt Line A from slot 4 PCI0
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* 9 Interrupt Line B from slot 4 PCI0
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* 10 Interrupt Line C from slot 4 PCI0
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* 11 Interrupt Line D from slot 4 PCI0
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* 12 Interrupt Line A from slot 5 PCI0
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* 13 Interrupt Line B from slot 5 PCI0
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* 14 Interrupt Line C from slot 5 PCI0
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* 15 Interrupt Line D from slot 5 PCI0
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* 16 EISA interrupt (PCI 0) or SCSI interrupt (PCI 1)
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* 17-23 NA
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*
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* IdSel
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* 1 EISA bridge (PCI bus 0 only)
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* 2 PCI option slot 2
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* 3 PCI option slot 3
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* 4 PCI option slot 4
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* 5 PCI option slot 5
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*
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*/
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static int
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rawhide_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
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{
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static char irq_tab[5][5] = {
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/*INT INTA INTB INTC INTD */
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{ 16+16, 16+16, 16+16, 16+16, 16+16}, /* IdSel 1 SCSI PCI 1 */
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{ 16+ 0, 16+ 0, 16+ 1, 16+ 2, 16+ 3}, /* IdSel 2 slot 2 */
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{ 16+ 4, 16+ 4, 16+ 5, 16+ 6, 16+ 7}, /* IdSel 3 slot 3 */
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{ 16+ 8, 16+ 8, 16+ 9, 16+10, 16+11}, /* IdSel 4 slot 4 */
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{ 16+12, 16+12, 16+13, 16+14, 16+15} /* IdSel 5 slot 5 */
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};
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const long min_idsel = 1, max_idsel = 5, irqs_per_slot = 5;
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struct pci_controller *hose = dev->sysdata;
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int irq = COMMON_TABLE_LOOKUP;
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if (irq >= 0)
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irq += 24 * hose->index;
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return irq;
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}
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/*
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* The System Vector
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*/
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struct alpha_machine_vector rawhide_mv __initmv = {
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.vector_name = "Rawhide",
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DO_EV5_MMU,
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DO_DEFAULT_RTC,
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DO_MCPCIA_IO,
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.machine_check = mcpcia_machine_check,
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.max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
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.min_io_address = DEFAULT_IO_BASE,
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.min_mem_address = MCPCIA_DEFAULT_MEM_BASE,
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.pci_dac_offset = MCPCIA_DAC_OFFSET,
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.nr_irqs = 128,
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.device_interrupt = rawhide_srm_device_interrupt,
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.init_arch = mcpcia_init_arch,
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.init_irq = rawhide_init_irq,
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.init_rtc = common_init_rtc,
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.init_pci = common_init_pci,
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.kill_arch = NULL,
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.pci_map_irq = rawhide_map_irq,
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.pci_swizzle = common_swizzle,
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};
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ALIAS_MV(rawhide)
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