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MN10300 changes 2012-12-12 

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Merge tag 'for-linus-20121212' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-mn10300

Pull MN10300 changes from David Howells:
 "miscellaneous MN10300 arch patches.  I've based it on top of Al Viro's
  signal tree - so these patches should be pulled after that."

* tag 'for-linus-20121212' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-mn10300:
  MN10300: Use asm-generic/pci_iomap.h
  MN10300: Get rid of unused variable from ASB2305 PCI code
  MN10300: ASB2305 PCI code needs linux/irq.h
  mn10300/mm/fault.c: Port OOM changes to do_page_fault
  MN10300: Handle cacheable PCI regions in pci_iomap()
  MN10300: fix debug polling in ttySM driver
  MN10300: ttySM: clean up unnecessary casting
  MN10300: fix SMP synchronization between txdma and serial driver
  MN10300: fix serial port vdma irq setup for SMP
  MN10300: cleanup IRQ affinity setting
  MN10300: ttySM: Use memory barriers correctly in circular buffer logic
This commit is contained in:
Linus Torvalds 2012-12-12 17:50:34 -08:00
parent 9977d9b379 76583cffb7
commit e37aa63e87
10 changed files with 234 additions and 136 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/mn10300/include/asm/io.h
View File

@ -14,6 +14,7 @@
#include <asm/page.h> /* I/O is all done through memory accesses */
#include <asm/cpu-regs.h>
#include <asm/cacheflush.h>
#include <asm-generic/pci_iomap.h>
#define mmiowb() do {} while (0)
@ -258,7 +259,7 @@ static inline void __iomem *__ioremap(unsigned long offset, unsigned long size,
static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
{
return (void __iomem *) offset;
return (void __iomem *)(offset & ~0x20000000);
}
/*

2
arch/mn10300/kernel/asm-offsets.c
View File

@ -96,7 +96,7 @@ void foo(void)
OFFSET(__rx_outp, mn10300_serial_port, rx_outp);
OFFSET(__uart_state, mn10300_serial_port, uart.state);
OFFSET(__tx_xchar, mn10300_serial_port, tx_xchar);
OFFSET(__tx_break, mn10300_serial_port, tx_break);
OFFSET(__tx_flags, mn10300_serial_port, tx_flags);
OFFSET(__intr_flags, mn10300_serial_port, intr_flags);
OFFSET(__rx_icr, mn10300_serial_port, rx_icr);
OFFSET(__tx_icr, mn10300_serial_port, tx_icr);

50
arch/mn10300/kernel/irq.c
View File

@ -142,57 +142,11 @@ mn10300_cpupic_setaffinity(struct irq_data *d, const struct cpumask *mask,
bool force)
{
unsigned long flags;
int err;
flags = arch_local_cli_save();
/* check irq no */
switch (d->irq) {
case TMJCIRQ:
case RESCHEDULE_IPI:
case CALL_FUNC_SINGLE_IPI:
case LOCAL_TIMER_IPI:
case FLUSH_CACHE_IPI:
case CALL_FUNCTION_NMI_IPI:
case DEBUGGER_NMI_IPI:
#ifdef CONFIG_MN10300_TTYSM0
case SC0RXIRQ:
case SC0TXIRQ:
#ifdef CONFIG_MN10300_TTYSM0_TIMER8
case TM8IRQ:
#elif CONFIG_MN10300_TTYSM0_TIMER2
case TM2IRQ:
#endif /* CONFIG_MN10300_TTYSM0_TIMER8 */
#endif /* CONFIG_MN10300_TTYSM0 */
#ifdef CONFIG_MN10300_TTYSM1
case SC1RXIRQ:
case SC1TXIRQ:
#ifdef CONFIG_MN10300_TTYSM1_TIMER12
case TM12IRQ:
#elif defined(CONFIG_MN10300_TTYSM1_TIMER9)
case TM9IRQ:
#elif defined(CONFIG_MN10300_TTYSM1_TIMER3)
case TM3IRQ:
#endif /* CONFIG_MN10300_TTYSM1_TIMER12 */
#endif /* CONFIG_MN10300_TTYSM1 */
#ifdef CONFIG_MN10300_TTYSM2
case SC2RXIRQ:
case SC2TXIRQ:
case TM10IRQ:
#endif /* CONFIG_MN10300_TTYSM2 */
err = -1;
break;
default:
set_bit(d->irq, irq_affinity_request);
err = 0;
break;
}
set_bit(d->irq, irq_affinity_request);
arch_local_irq_restore(flags);
return err;
return 0;
}
#endif /* CONFIG_SMP */

9
arch/mn10300/kernel/mn10300-serial-low.S
View File

@ -118,8 +118,8 @@ ENTRY(mn10300_serial_vdma_tx_handler)
movbu d2,(e3) # ACK the interrupt
movhu (e3),d2 # flush
btst 0x01,(__tx_break,a3) # handle transmit break request
bne mnsc_vdma_tx_break
btst 0xFF,(__tx_flags,a3) # handle transmit flags
bne mnsc_vdma_tx_flags
movbu (SCxSTR,e2),d2 # don't try and transmit a char if the
# buffer is not empty
@ -171,10 +171,13 @@ mnsc_vdma_tx_empty:
bset MNSCx_TX_EMPTY,(__intr_flags,a3)
bra mnsc_vdma_tx_done
mnsc_vdma_tx_break:
mnsc_vdma_tx_flags:
btst MNSCx_TX_STOP,(__tx_flags,a3)
bne mnsc_vdma_tx_stop
movhu (SCxCTR,e2),d2 # turn on break mode
or SC01CTR_BKE,d2
movhu d2,(SCxCTR,e2)
mnsc_vdma_tx_stop:
mov +(NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL)|GxICR_DETECT),d2
movhu d2,(e3) # disable transmit interrupts on this
# channel

213
arch/mn10300/kernel/mn10300-serial.c
View File

@ -408,6 +408,34 @@ static struct irq_chip mn10300_serial_pic = {
.irq_unmask = mn10300_serial_nop,
};
static void mn10300_serial_low_mask(struct irq_data *d)
{
unsigned long flags;
u16 tmp;
flags = arch_local_cli_save();
GxICR(d->irq) = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL);
tmp = GxICR(d->irq); /* flush write buffer */
arch_local_irq_restore(flags);
}
static void mn10300_serial_low_unmask(struct irq_data *d)
{
unsigned long flags;
u16 tmp;
flags = arch_local_cli_save();
GxICR(d->irq) =
NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL) | GxICR_ENABLE;
tmp = GxICR(d->irq); /* flush write buffer */
arch_local_irq_restore(flags);
}
static struct irq_chip mn10300_serial_low_pic = {
.name = "mnserial-low",
.irq_mask = mn10300_serial_low_mask,
.irq_unmask = mn10300_serial_low_unmask,
};
/*
* serial virtual DMA interrupt jump table
@ -416,25 +444,53 @@ struct mn10300_serial_int mn10300_serial_int_tbl[NR_IRQS];
static void mn10300_serial_dis_tx_intr(struct mn10300_serial_port *port)
{
unsigned long flags;
int retries = 100;
u16 x;
flags = arch_local_cli_save();
*port->tx_icr = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL);
x = *port->tx_icr;
arch_local_irq_restore(flags);
/* nothing to do if irq isn't set up */
if (!mn10300_serial_int_tbl[port->tx_irq].port)
return;
port->tx_flags |= MNSCx_TX_STOP;
mb();
/*
* Here we wait for the irq to be disabled. Either it already is
* disabled or we wait some number of retries for the VDMA handler
* to disable it. The retries give the VDMA handler enough time to
* run to completion if it was already in progress. If the VDMA IRQ
* is enabled but the handler is not yet running when arrive here,
* the STOP flag will prevent the handler from conflicting with the
* driver code following this loop.
*/
while ((*port->tx_icr & GxICR_ENABLE) && retries-- > 0)
;
if (retries <= 0) {
*port->tx_icr =
NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL);
x = *port->tx_icr;
}
}
static void mn10300_serial_en_tx_intr(struct mn10300_serial_port *port)
{
unsigned long flags;
u16 x;
flags = arch_local_cli_save();
/* nothing to do if irq isn't set up */
if (!mn10300_serial_int_tbl[port->tx_irq].port)
return;
/* stop vdma irq if not already stopped */
if (!(port->tx_flags & MNSCx_TX_STOP))
mn10300_serial_dis_tx_intr(port);
port->tx_flags &= ~MNSCx_TX_STOP;
mb();
*port->tx_icr =
NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL) | GxICR_ENABLE;
NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL) |
GxICR_ENABLE | GxICR_REQUEST | GxICR_DETECT;
x = *port->tx_icr;
arch_local_irq_restore(flags);
}
static void mn10300_serial_dis_rx_intr(struct mn10300_serial_port *port)
@ -487,16 +543,17 @@ static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port)
try_again:
/* pull chars out of the hat */
ix = port->rx_outp;
if (ix == port->rx_inp) {
ix = ACCESS_ONCE(port->rx_outp);
if (CIRC_CNT(port->rx_inp, ix, MNSC_BUFFER_SIZE) == 0) {
if (push && !tty->low_latency)
tty_flip_buffer_push(tty);
return;
}
smp_read_barrier_depends();
ch = port->rx_buffer[ix++];
st = port->rx_buffer[ix++];
smp_rmb();
smp_mb();
port->rx_outp = ix & (MNSC_BUFFER_SIZE - 1);
port->uart.icount.rx++;
@ -778,8 +835,6 @@ static void mn10300_serial_start_tx(struct uart_port *_port)
struct mn10300_serial_port *port =
container_of(_port, struct mn10300_serial_port, uart);
u16 x;
_enter("%s{%lu}",
port->name,
CIRC_CNT(&port->uart.state->xmit.head,
@ -787,14 +842,7 @@ static void mn10300_serial_start_tx(struct uart_port *_port)
UART_XMIT_SIZE));
/* kick the virtual DMA controller */
arch_local_cli();
x = *port->tx_icr;
x |= GxICR_ENABLE;
if (*port->_status & SC01STR_TBF)
x &= ~(GxICR_REQUEST | GxICR_DETECT);
else
x |= GxICR_REQUEST | GxICR_DETECT;
mn10300_serial_en_tx_intr(port);
_debug("CTR=%04hx ICR=%02hx STR=%04x TMD=%02hx TBR=%04hx ICR=%04hx",
*port->_control, *port->_intr, *port->_status,
@ -802,10 +850,6 @@ static void mn10300_serial_start_tx(struct uart_port *_port)
(port->div_timer == MNSCx_DIV_TIMER_8BIT) ?
*(volatile u8 *)port->_tmxbr : *port->_tmxbr,
*port->tx_icr);
*port->tx_icr = x;
x = *port->tx_icr;
arch_local_sti();
}
/*
@ -815,13 +859,17 @@ static void mn10300_serial_send_xchar(struct uart_port *_port, char ch)
{
struct mn10300_serial_port *port =
container_of(_port, struct mn10300_serial_port, uart);
unsigned long flags;
_enter("%s,%02x", port->name, ch);
if (likely(port->gdbstub)) {
port->tx_xchar = ch;
if (ch)
if (ch) {
spin_lock_irqsave(&port->uart.lock, flags);
mn10300_serial_en_tx_intr(port);
spin_unlock_irqrestore(&port->uart.lock, flags);
}
}
}
@ -882,18 +930,21 @@ static void mn10300_serial_break_ctl(struct uart_port *_port, int ctl)
{
struct mn10300_serial_port *port =
container_of(_port, struct mn10300_serial_port, uart);
unsigned long flags;
_enter("%s,%d", port->name, ctl);
spin_lock_irqsave(&port->uart.lock, flags);
if (ctl) {
/* tell the virtual DMA handler to assert BREAK */
port->tx_break = 1;
port->tx_flags |= MNSCx_TX_BREAK;
mn10300_serial_en_tx_intr(port);
} else {
port->tx_break = 0;
port->tx_flags &= ~MNSCx_TX_BREAK;
*port->_control &= ~SC01CTR_BKE;
mn10300_serial_en_tx_intr(port);
}
spin_unlock_irqrestore(&port->uart.lock, flags);
}
/*
@ -916,6 +967,7 @@ static int mn10300_serial_startup(struct uart_port *_port)
return -ENOMEM;
port->rx_inp = port->rx_outp = 0;
port->tx_flags = 0;
/* finally, enable the device */
*port->_intr = SC01ICR_TI;
@ -928,22 +980,23 @@ static int mn10300_serial_startup(struct uart_port *_port)
pint->port = port;
pint->vdma = mn10300_serial_vdma_tx_handler;
set_intr_level(port->rx_irq,
NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL));
set_intr_level(port->tx_irq,
NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL));
irq_set_chip(port->rx_irq, &mn10300_serial_low_pic);
irq_set_chip(port->tx_irq, &mn10300_serial_low_pic);
irq_set_chip(port->tm_irq, &mn10300_serial_pic);
if (request_irq(port->rx_irq, mn10300_serial_interrupt,
IRQF_DISABLED, port->rx_name, port) < 0)
IRQF_DISABLED | IRQF_NOBALANCING,
port->rx_name, port) < 0)
goto error;
if (request_irq(port->tx_irq, mn10300_serial_interrupt,
IRQF_DISABLED, port->tx_name, port) < 0)
IRQF_DISABLED | IRQF_NOBALANCING,
port->tx_name, port) < 0)
goto error2;
if (request_irq(port->tm_irq, mn10300_serial_interrupt,
IRQF_DISABLED, port->tm_name, port) < 0)
IRQF_DISABLED | IRQF_NOBALANCING,
port->tm_name, port) < 0)
goto error3;
mn10300_serial_mask_ack(port->tm_irq);
@ -964,14 +1017,22 @@ error:
*/
static void mn10300_serial_shutdown(struct uart_port *_port)
{
unsigned long flags;
u16 x;
struct mn10300_serial_port *port =
container_of(_port, struct mn10300_serial_port, uart);
_enter("%s", port->name);
spin_lock_irqsave(&_port->lock, flags);
mn10300_serial_dis_tx_intr(port);
*port->rx_icr = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL);
x = *port->rx_icr;
port->tx_flags = 0;
spin_unlock_irqrestore(&_port->lock, flags);
/* disable the serial port and its baud rate timer */
port->tx_break = 0;
*port->_control &= ~(SC01CTR_TXE | SC01CTR_RXE | SC01CTR_BKE);
*port->_tmxmd = 0;
@ -986,12 +1047,8 @@ static void mn10300_serial_shutdown(struct uart_port *_port)
free_irq(port->rx_irq, port);
free_irq(port->tx_irq, port);
arch_local_cli();
*port->rx_icr = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL);
x = *port->rx_icr;
*port->tx_icr = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL);
x = *port->tx_icr;
arch_local_sti();
mn10300_serial_int_tbl[port->tx_irq].port = NULL;
mn10300_serial_int_tbl[port->rx_irq].port = NULL;
}
/*
@ -1317,7 +1374,8 @@ timer_okay:
if ((new->c_cflag & CREAD) == 0)
port->uart.ignore_status_mask |= (1 << TTY_NORMAL);
scxctr |= *port->_control & (SC01CTR_TXE | SC01CTR_RXE | SC01CTR_BKE);
scxctr |= SC01CTR_TXE | SC01CTR_RXE;
scxctr |= *port->_control & SC01CTR_BKE;
*port->_control = scxctr;
spin_unlock_irqrestore(&port->uart.lock, flags);
@ -1519,17 +1577,24 @@ static void mn10300_serial_console_write(struct console *co,
{
struct mn10300_serial_port *port;
unsigned i;
u16 scxctr, txicr, tmp;
u16 scxctr;
u8 tmxmd;
unsigned long flags;
int locked = 1;
port = mn10300_serial_ports[co->index];
local_irq_save(flags);
if (port->uart.sysrq) {
/* mn10300_serial_interrupt() already took the lock */
locked = 0;
} else if (oops_in_progress) {
locked = spin_trylock(&port->uart.lock);
} else
spin_lock(&port->uart.lock);
/* firstly hijack the serial port from the "virtual DMA" controller */
arch_local_cli();
txicr = *port->tx_icr;
*port->tx_icr = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL);
tmp = *port->tx_icr;
arch_local_sti();
mn10300_serial_dis_tx_intr(port);
/* the transmitter may be disabled */
scxctr = *port->_control;
@ -1565,12 +1630,12 @@ static void mn10300_serial_console_write(struct console *co,
while (*port->_status & SC01STR_TBF)
continue;
*(u8 *) port->_txb = ch;
*port->_txb = ch;
if (ch == 0x0a) {
while (*port->_status & SC01STR_TBF)
continue;
*(u8 *) port->_txb = 0xd;
*port->_txb = 0xd;
}
}
@ -1583,10 +1648,11 @@ static void mn10300_serial_console_write(struct console *co,
if (!(scxctr & SC01CTR_TXE))
*port->_control = scxctr;
arch_local_cli();
*port->tx_icr = txicr;
tmp = *port->tx_icr;
arch_local_sti();
mn10300_serial_en_tx_intr(port);
if (locked)
spin_unlock(&port->uart.lock);
local_irq_restore(flags);
}
/*
@ -1655,18 +1721,29 @@ static int mn10300_serial_poll_get_char(struct uart_port *_port)
_enter("%s", port->name);
do {
/* pull chars out of the hat */
ix = port->rx_outp;
if (ix == port->rx_inp)
return NO_POLL_CHAR;
if (mn10300_serial_int_tbl[port->rx_irq].port != NULL) {
do {
/* pull chars out of the hat */
ix = ACCESS_ONCE(port->rx_outp);
if (CIRC_CNT(port->rx_inp, ix, MNSC_BUFFER_SIZE) == 0)
return NO_POLL_CHAR;
ch = port->rx_buffer[ix++];
st = port->rx_buffer[ix++];
smp_rmb();
port->rx_outp = ix & (MNSC_BUFFER_SIZE - 1);
smp_read_barrier_depends();
ch = port->rx_buffer[ix++];
st = port->rx_buffer[ix++];
smp_mb();
port->rx_outp = ix & (MNSC_BUFFER_SIZE - 1);
} while (st & (SC01STR_FEF | SC01STR_PEF | SC01STR_OEF));
} while (st & (SC01STR_FEF | SC01STR_PEF | SC01STR_OEF));
} else {
do {
st = *port->_status;
if (st & (SC01STR_FEF | SC01STR_PEF | SC01STR_OEF))
continue;
} while (!(st & SC01STR_RBF));
ch = *port->_rxb;
}
return ch;
}
@ -1693,12 +1770,12 @@ static void mn10300_serial_poll_put_char(struct uart_port *_port,
tmp = *port->_intr;
if (ch == 0x0a) {
*(u8 *) port->_txb = 0x0d;
*port->_txb = 0x0d;
while (*port->_status & SC01STR_TBF)
continue;
}
*(u8 *) port->_txb = ch;
*port->_txb = ch;
while (*port->_status & SC01STR_TBF)
continue;

10
arch/mn10300/kernel/mn10300-serial.h
View File

@ -29,6 +29,10 @@
#define MNSCx_TX_SPACE 0x04
#define MNSCx_TX_EMPTY 0x08
/* tx_flags bits */
#define MNSCx_TX_BREAK 0x01
#define MNSCx_TX_STOP 0x02
#ifndef __ASSEMBLY__
struct mn10300_serial_port {
@ -36,7 +40,7 @@ struct mn10300_serial_port {
unsigned rx_inp; /* pointer to rx input offset */
unsigned rx_outp; /* pointer to rx output offset */
u8 tx_xchar; /* high-priority XON/XOFF buffer */
u8 tx_break; /* transmit break request */
u8 tx_flags; /* transmit break/stop request */
u8 intr_flags; /* interrupt flags */
volatile u16 *rx_icr; /* Rx interrupt control register */
volatile u16 *tx_icr; /* Tx interrupt control register */
@ -54,8 +58,8 @@ struct mn10300_serial_port {
volatile u16 *_control; /* control register pointer */
volatile u8 *_status; /* status register pointer */
volatile u8 *_intr; /* interrupt register pointer */
volatile void *_rxb; /* receive buffer register pointer */
volatile void *_txb; /* transmit buffer register pointer */
volatile u8 *_rxb; /* receive buffer register pointer */
volatile u8 *_txb; /* transmit buffer register pointer */
volatile u16 *_tmicr; /* timer interrupt control register */
volatile u8 *_tmxmd; /* baud rate timer mode register */
volatile u16 *_tmxbr; /* baud rate timer base register */

10
arch/mn10300/kernel/smp.c
View File

@ -130,10 +130,12 @@ static irqreturn_t smp_call_function_interrupt(int irq, void *dev_id);
static struct irqaction reschedule_ipi = {
.handler = smp_reschedule_interrupt,
.flags = IRQF_NOBALANCING,
.name = "smp reschedule IPI"
};
static struct irqaction call_function_ipi = {
.handler = smp_call_function_interrupt,
.flags = IRQF_NOBALANCING,
.name = "smp call function IPI"
};
@ -141,7 +143,7 @@ static struct irqaction call_function_ipi = {
static irqreturn_t smp_ipi_timer_interrupt(int irq, void *dev_id);
static struct irqaction local_timer_ipi = {
.handler = smp_ipi_timer_interrupt,
.flags = IRQF_DISABLED,
.flags = IRQF_DISABLED | IRQF_NOBALANCING,
.name = "smp local timer IPI"
};
#endif
@ -180,6 +182,7 @@ static void init_ipi(void)
#ifdef CONFIG_MN10300_CACHE_ENABLED
/* set up the cache flush IPI */
irq_set_chip(FLUSH_CACHE_IPI, &mn10300_ipi_type);
flags = arch_local_cli_save();
__set_intr_stub(NUM2EXCEP_IRQ_LEVEL(FLUSH_CACHE_GxICR_LV),
mn10300_low_ipi_handler);
@ -189,6 +192,7 @@ static void init_ipi(void)
#endif
/* set up the NMI call function IPI */
irq_set_chip(CALL_FUNCTION_NMI_IPI, &mn10300_ipi_type);
flags = arch_local_cli_save();
GxICR(CALL_FUNCTION_NMI_IPI) = GxICR_NMI | GxICR_ENABLE | GxICR_DETECT;
tmp16 = GxICR(CALL_FUNCTION_NMI_IPI);
@ -199,6 +203,10 @@ static void init_ipi(void)
__set_intr_stub(NUM2EXCEP_IRQ_LEVEL(SMP_BOOT_GxICR_LV),
mn10300_low_ipi_handler);
arch_local_irq_restore(flags);
#ifdef CONFIG_KERNEL_DEBUGGER
irq_set_chip(DEBUGGER_NMI_IPI, &mn10300_ipi_type);
#endif
}
/**

33
arch/mn10300/mm/fault.c
View File

@ -123,7 +123,8 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long fault_code,
struct mm_struct *mm;
unsigned long page;
siginfo_t info;
int write, fault;
int fault;
unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
#ifdef CONFIG_GDBSTUB
/* handle GDB stub causing a fault */
@ -170,6 +171,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long fault_code,
if (in_atomic() || !mm)
goto no_context;
retry:
down_read(&mm->mmap_sem);
vma = find_vma(mm, address);
@ -220,7 +222,6 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long fault_code,
*/
good_area:
info.si_code = SEGV_ACCERR;
write = 0;
switch (fault_code & (MMUFCR_xFC_PGINVAL|MMUFCR_xFC_TYPE)) {
default: /* 3: write, present */
case MMUFCR_xFC_TYPE_WRITE:
@ -232,7 +233,7 @@ good_area:
case MMUFCR_xFC_PGINVAL | MMUFCR_xFC_TYPE_WRITE:
if (!(vma->vm_flags & VM_WRITE))
goto bad_area;
write++;
flags |= FAULT_FLAG_WRITE;
break;
/* read from protected page */
@ -251,7 +252,11 @@ good_area:
* make sure we exit gracefully rather than endlessly redo
* the fault.
*/
fault = handle_mm_fault(mm, vma, address, write ? FAULT_FLAG_WRITE : 0);
fault = handle_mm_fault(mm, vma, address, flags);
if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
return;
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
@ -259,10 +264,22 @@ good_area:
goto do_sigbus;
BUG();
}
if (fault & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (fault & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
if (fault & VM_FAULT_RETRY) {
flags &= ~FAULT_FLAG_ALLOW_RETRY;
/* No need to up_read(&mm->mmap_sem) as we would
* have already released it in __lock_page_or_retry
* in mm/filemap.c.
*/
goto retry;
}
}
up_read(&mm->mmap_sem);
return;

35
arch/mn10300/unit-asb2305/pci-iomap.c Normal file
View File

@ -0,0 +1,35 @@
/* ASB2305 PCI I/O mapping handler
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/pci.h>
#include <linux/module.h>
/*
* Create a virtual mapping cookie for a PCI BAR (memory or IO)
*/
void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
{
resource_size_t start = pci_resource_start(dev, bar);
resource_size_t len = pci_resource_len(dev, bar);
unsigned long flags = pci_resource_flags(dev, bar);
if (!len || !start)
return NULL;
if ((flags & IORESOURCE_IO) || (flags & IORESOURCE_MEM)) {
if (flags & IORESOURCE_CACHEABLE && !(flags & IORESOURCE_IO))
return ioremap(start, len);
else
return ioremap_nocache(start, len);
}
return NULL;
}
EXPORT_SYMBOL(pci_iomap);

5
arch/mn10300/unit-asb2305/pci.c
View File

@ -17,6 +17,7 @@
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <asm/io.h>
#include "pci-asb2305.h"
@ -303,9 +304,7 @@ static int __devinit is_valid_resource(struct pci_dev *dev, int idx)
static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
{
struct pci_bus_region region;
int i;
int limit;
int limit, i;
if (dev->bus->number != 0)
return;