mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-20 09:31:09 +00:00
7d12e780e0
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
392 lines
9.5 KiB
C
392 lines
9.5 KiB
C
/*
|
|
* Adaptec AAC series RAID controller driver
|
|
* (c) Copyright 2001 Red Hat Inc. <alan@redhat.com>
|
|
*
|
|
* based on the old aacraid driver that is..
|
|
* Adaptec aacraid device driver for Linux.
|
|
*
|
|
* Copyright (c) 2000 Adaptec, Inc. (aacraid@adaptec.com)
|
|
*
|
|
* 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
|
|
* the Free Software Foundation; either version 2, or (at your option)
|
|
* any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; see the file COPYING. If not, write to
|
|
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* Module Name:
|
|
* sa.c
|
|
*
|
|
* Abstract: Drawbridge specific support functions
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/types.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/time.h>
|
|
#include <linux/interrupt.h>
|
|
#include <asm/semaphore.h>
|
|
|
|
#include <scsi/scsi_host.h>
|
|
|
|
#include "aacraid.h"
|
|
|
|
static irqreturn_t aac_sa_intr(int irq, void *dev_id)
|
|
{
|
|
struct aac_dev *dev = dev_id;
|
|
unsigned short intstat, mask;
|
|
|
|
intstat = sa_readw(dev, DoorbellReg_p);
|
|
/*
|
|
* Read mask and invert because drawbridge is reversed.
|
|
* This allows us to only service interrupts that have been enabled.
|
|
*/
|
|
mask = ~(sa_readw(dev, SaDbCSR.PRISETIRQMASK));
|
|
|
|
/* Check to see if this is our interrupt. If it isn't just return */
|
|
|
|
if (intstat & mask) {
|
|
if (intstat & PrintfReady) {
|
|
aac_printf(dev, sa_readl(dev, Mailbox5));
|
|
sa_writew(dev, DoorbellClrReg_p, PrintfReady); /* clear PrintfReady */
|
|
sa_writew(dev, DoorbellReg_s, PrintfDone);
|
|
} else if (intstat & DOORBELL_1) { // dev -> Host Normal Command Ready
|
|
sa_writew(dev, DoorbellClrReg_p, DOORBELL_1);
|
|
aac_command_normal(&dev->queues->queue[HostNormCmdQueue]);
|
|
} else if (intstat & DOORBELL_2) { // dev -> Host Normal Response Ready
|
|
sa_writew(dev, DoorbellClrReg_p, DOORBELL_2);
|
|
aac_response_normal(&dev->queues->queue[HostNormRespQueue]);
|
|
} else if (intstat & DOORBELL_3) { // dev -> Host Normal Command Not Full
|
|
sa_writew(dev, DoorbellClrReg_p, DOORBELL_3);
|
|
} else if (intstat & DOORBELL_4) { // dev -> Host Normal Response Not Full
|
|
sa_writew(dev, DoorbellClrReg_p, DOORBELL_4);
|
|
}
|
|
return IRQ_HANDLED;
|
|
}
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
/**
|
|
* aac_sa_disable_interrupt - disable interrupt
|
|
* @dev: Which adapter to enable.
|
|
*/
|
|
|
|
static void aac_sa_disable_interrupt (struct aac_dev *dev)
|
|
{
|
|
sa_writew(dev, SaDbCSR.PRISETIRQMASK, 0xffff);
|
|
}
|
|
|
|
/**
|
|
* aac_sa_notify_adapter - handle adapter notification
|
|
* @dev: Adapter that notification is for
|
|
* @event: Event to notidy
|
|
*
|
|
* Notify the adapter of an event
|
|
*/
|
|
|
|
static void aac_sa_notify_adapter(struct aac_dev *dev, u32 event)
|
|
{
|
|
switch (event) {
|
|
|
|
case AdapNormCmdQue:
|
|
sa_writew(dev, DoorbellReg_s,DOORBELL_1);
|
|
break;
|
|
case HostNormRespNotFull:
|
|
sa_writew(dev, DoorbellReg_s,DOORBELL_4);
|
|
break;
|
|
case AdapNormRespQue:
|
|
sa_writew(dev, DoorbellReg_s,DOORBELL_2);
|
|
break;
|
|
case HostNormCmdNotFull:
|
|
sa_writew(dev, DoorbellReg_s,DOORBELL_3);
|
|
break;
|
|
case HostShutdown:
|
|
/*
|
|
sa_sync_cmd(dev, HOST_CRASHING, 0, 0, 0, 0, 0, 0,
|
|
NULL, NULL, NULL, NULL, NULL);
|
|
*/
|
|
break;
|
|
case FastIo:
|
|
sa_writew(dev, DoorbellReg_s,DOORBELL_6);
|
|
break;
|
|
case AdapPrintfDone:
|
|
sa_writew(dev, DoorbellReg_s,DOORBELL_5);
|
|
break;
|
|
default:
|
|
BUG();
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* sa_sync_cmd - send a command and wait
|
|
* @dev: Adapter
|
|
* @command: Command to execute
|
|
* @p1: first parameter
|
|
* @ret: adapter status
|
|
*
|
|
* This routine will send a synchronous command to the adapter and wait
|
|
* for its completion.
|
|
*/
|
|
|
|
static int sa_sync_cmd(struct aac_dev *dev, u32 command,
|
|
u32 p1, u32 p2, u32 p3, u32 p4, u32 p5, u32 p6,
|
|
u32 *ret, u32 *r1, u32 *r2, u32 *r3, u32 *r4)
|
|
{
|
|
unsigned long start;
|
|
int ok;
|
|
/*
|
|
* Write the Command into Mailbox 0
|
|
*/
|
|
sa_writel(dev, Mailbox0, command);
|
|
/*
|
|
* Write the parameters into Mailboxes 1 - 4
|
|
*/
|
|
sa_writel(dev, Mailbox1, p1);
|
|
sa_writel(dev, Mailbox2, p2);
|
|
sa_writel(dev, Mailbox3, p3);
|
|
sa_writel(dev, Mailbox4, p4);
|
|
|
|
/*
|
|
* Clear the synch command doorbell to start on a clean slate.
|
|
*/
|
|
sa_writew(dev, DoorbellClrReg_p, DOORBELL_0);
|
|
/*
|
|
* Signal that there is a new synch command
|
|
*/
|
|
sa_writew(dev, DoorbellReg_s, DOORBELL_0);
|
|
|
|
ok = 0;
|
|
start = jiffies;
|
|
|
|
while(time_before(jiffies, start+30*HZ))
|
|
{
|
|
/*
|
|
* Delay 5uS so that the monitor gets access
|
|
*/
|
|
udelay(5);
|
|
/*
|
|
* Mon110 will set doorbell0 bit when it has
|
|
* completed the command.
|
|
*/
|
|
if(sa_readw(dev, DoorbellReg_p) & DOORBELL_0) {
|
|
ok = 1;
|
|
break;
|
|
}
|
|
msleep(1);
|
|
}
|
|
|
|
if (ok != 1)
|
|
return -ETIMEDOUT;
|
|
/*
|
|
* Clear the synch command doorbell.
|
|
*/
|
|
sa_writew(dev, DoorbellClrReg_p, DOORBELL_0);
|
|
/*
|
|
* Pull the synch status from Mailbox 0.
|
|
*/
|
|
if (ret)
|
|
*ret = sa_readl(dev, Mailbox0);
|
|
if (r1)
|
|
*r1 = sa_readl(dev, Mailbox1);
|
|
if (r2)
|
|
*r2 = sa_readl(dev, Mailbox2);
|
|
if (r3)
|
|
*r3 = sa_readl(dev, Mailbox3);
|
|
if (r4)
|
|
*r4 = sa_readl(dev, Mailbox4);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* aac_sa_interrupt_adapter - interrupt an adapter
|
|
* @dev: Which adapter to enable.
|
|
*
|
|
* Breakpoint an adapter.
|
|
*/
|
|
|
|
static void aac_sa_interrupt_adapter (struct aac_dev *dev)
|
|
{
|
|
sa_sync_cmd(dev, BREAKPOINT_REQUEST, 0, 0, 0, 0, 0, 0,
|
|
NULL, NULL, NULL, NULL, NULL);
|
|
}
|
|
|
|
/**
|
|
* aac_sa_start_adapter - activate adapter
|
|
* @dev: Adapter
|
|
*
|
|
* Start up processing on an ARM based AAC adapter
|
|
*/
|
|
|
|
static void aac_sa_start_adapter(struct aac_dev *dev)
|
|
{
|
|
struct aac_init *init;
|
|
/*
|
|
* Fill in the remaining pieces of the init.
|
|
*/
|
|
init = dev->init;
|
|
init->HostElapsedSeconds = cpu_to_le32(get_seconds());
|
|
/* We can only use a 32 bit address here */
|
|
sa_sync_cmd(dev, INIT_STRUCT_BASE_ADDRESS,
|
|
(u32)(ulong)dev->init_pa, 0, 0, 0, 0, 0,
|
|
NULL, NULL, NULL, NULL, NULL);
|
|
}
|
|
|
|
/**
|
|
* aac_sa_check_health
|
|
* @dev: device to check if healthy
|
|
*
|
|
* Will attempt to determine if the specified adapter is alive and
|
|
* capable of handling requests, returning 0 if alive.
|
|
*/
|
|
static int aac_sa_check_health(struct aac_dev *dev)
|
|
{
|
|
long status = sa_readl(dev, Mailbox7);
|
|
|
|
/*
|
|
* Check to see if the board failed any self tests.
|
|
*/
|
|
if (status & SELF_TEST_FAILED)
|
|
return -1;
|
|
/*
|
|
* Check to see if the board panic'd while booting.
|
|
*/
|
|
if (status & KERNEL_PANIC)
|
|
return -2;
|
|
/*
|
|
* Wait for the adapter to be up and running. Wait up to 3 minutes
|
|
*/
|
|
if (!(status & KERNEL_UP_AND_RUNNING))
|
|
return -3;
|
|
/*
|
|
* Everything is OK
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* aac_sa_ioremap
|
|
* @size: mapping resize request
|
|
*
|
|
*/
|
|
static int aac_sa_ioremap(struct aac_dev * dev, u32 size)
|
|
{
|
|
if (!size) {
|
|
iounmap(dev->regs.sa);
|
|
return 0;
|
|
}
|
|
dev->base = dev->regs.sa = ioremap(dev->scsi_host_ptr->base, size);
|
|
return (dev->base == NULL) ? -1 : 0;
|
|
}
|
|
|
|
/**
|
|
* aac_sa_init - initialize an ARM based AAC card
|
|
* @dev: device to configure
|
|
*
|
|
* Allocate and set up resources for the ARM based AAC variants. The
|
|
* device_interface in the commregion will be allocated and linked
|
|
* to the comm region.
|
|
*/
|
|
|
|
int aac_sa_init(struct aac_dev *dev)
|
|
{
|
|
unsigned long start;
|
|
unsigned long status;
|
|
int instance;
|
|
const char *name;
|
|
|
|
instance = dev->id;
|
|
name = dev->name;
|
|
|
|
if (aac_sa_ioremap(dev, dev->base_size)) {
|
|
printk(KERN_WARNING "%s: unable to map adapter.\n", name);
|
|
goto error_iounmap;
|
|
}
|
|
|
|
/*
|
|
* Check to see if the board failed any self tests.
|
|
*/
|
|
if (sa_readl(dev, Mailbox7) & SELF_TEST_FAILED) {
|
|
printk(KERN_WARNING "%s%d: adapter self-test failed.\n", name, instance);
|
|
goto error_iounmap;
|
|
}
|
|
/*
|
|
* Check to see if the board panic'd while booting.
|
|
*/
|
|
if (sa_readl(dev, Mailbox7) & KERNEL_PANIC) {
|
|
printk(KERN_WARNING "%s%d: adapter kernel panic'd.\n", name, instance);
|
|
goto error_iounmap;
|
|
}
|
|
start = jiffies;
|
|
/*
|
|
* Wait for the adapter to be up and running. Wait up to 3 minutes.
|
|
*/
|
|
while (!(sa_readl(dev, Mailbox7) & KERNEL_UP_AND_RUNNING)) {
|
|
if (time_after(jiffies, start+startup_timeout*HZ)) {
|
|
status = sa_readl(dev, Mailbox7);
|
|
printk(KERN_WARNING "%s%d: adapter kernel failed to start, init status = %lx.\n",
|
|
name, instance, status);
|
|
goto error_iounmap;
|
|
}
|
|
msleep(1);
|
|
}
|
|
|
|
if (request_irq(dev->scsi_host_ptr->irq, aac_sa_intr, IRQF_SHARED|IRQF_DISABLED, "aacraid", (void *)dev ) < 0) {
|
|
printk(KERN_WARNING "%s%d: Interrupt unavailable.\n", name, instance);
|
|
goto error_iounmap;
|
|
}
|
|
|
|
/*
|
|
* Fill in the function dispatch table.
|
|
*/
|
|
|
|
dev->a_ops.adapter_interrupt = aac_sa_interrupt_adapter;
|
|
dev->a_ops.adapter_disable_int = aac_sa_disable_interrupt;
|
|
dev->a_ops.adapter_notify = aac_sa_notify_adapter;
|
|
dev->a_ops.adapter_sync_cmd = sa_sync_cmd;
|
|
dev->a_ops.adapter_check_health = aac_sa_check_health;
|
|
dev->a_ops.adapter_ioremap = aac_sa_ioremap;
|
|
|
|
/*
|
|
* First clear out all interrupts. Then enable the one's that
|
|
* we can handle.
|
|
*/
|
|
sa_writew(dev, SaDbCSR.PRISETIRQMASK, 0xffff);
|
|
sa_writew(dev, SaDbCSR.PRICLEARIRQMASK, (PrintfReady | DOORBELL_1 |
|
|
DOORBELL_2 | DOORBELL_3 | DOORBELL_4));
|
|
|
|
if(aac_init_adapter(dev) == NULL)
|
|
goto error_irq;
|
|
|
|
/*
|
|
* Tell the adapter that all is configure, and it can start
|
|
* accepting requests
|
|
*/
|
|
aac_sa_start_adapter(dev);
|
|
return 0;
|
|
|
|
error_irq:
|
|
sa_writew(dev, SaDbCSR.PRISETIRQMASK, 0xffff);
|
|
free_irq(dev->scsi_host_ptr->irq, (void *)dev);
|
|
|
|
error_iounmap:
|
|
|
|
return -1;
|
|
}
|
|
|