[PATCH][1/3] Update CVS KGDB's serial driver

From: Tom Rini
Date: Wed Feb 25 2004 - 16:46:03 EST

The following updates the serial driver with the fixes / cleanups that
are in George's version of the driver. There's a few slightly 'odd'
things in this patch, which stem from the fact that in my next round of
patches there will (a) be kernel/Kconfig.kgdb and (b) 1 kgdb i/o driver
at a time.

# This is a BitKeeper generated patch for the following project:
# Project Name: Linux kernel tree
# This patch format is intended for GNU patch command version 2.5 or higher.
# This patch includes the following deltas:
# ChangeSet 1.1662 -> 1.1663
# drivers/serial/kgdb_8250.c 1.2 -> 1.3
# kernel/kgdb.c 1.2 -> 1.3
# drivers/serial/Kconfig 1.21 -> 1.22
# include/linux/kgdb.h 1.2 -> 1.3
#
# The following is the BitKeeper ChangeSet Log
# --------------------------------------------
# 04/02/25 trini@xxxxxxxxxxxxxxxxxxx 1.1663
# Serial update.
# --------------------------------------------
#
diff -Nru a/drivers/serial/Kconfig b/drivers/serial/Kconfig
--- a/drivers/serial/Kconfig Wed Feb 25 14:21:26 2004
+++ b/drivers/serial/Kconfig Wed Feb 25 14:21:26 2004
@@ -13,6 +13,27 @@
Uses generic serial port (8250) for kgdb. This is independent of the
option 9250/16550 and compatible serial port.

+config KGDB_PORT
+ hex "hex I/O port address of the debug serial port"
+ depends on KGDB_8250
+ default 3f8
+ help
+ Some systems (x86 family at this writing) allow the port
+ address to be configured. The number entered is assumed to be
+ hex, don't put 0x in front of it. The standard address are:
+ COM1 3f8 , irq 4 and COM2 2f8 irq 3. Setserial /dev/ttySx
+ will tell you what you have. It is good to test the serial
+ connection with a live system before trying to debug.
+
+config KGDB_IRQ
+ int "IRQ of the debug serial port"
+ depends on KGDB_8250
+ default 4
+ help
+ This is the irq for the debug port. If everything is working
+ correctly and the kernel has interrupts on a control C to the
+ port should cause a break into the kernel debug stub.
+
#
# The new 8250/16550 serial drivers
config SERIAL_8250
diff -Nru a/drivers/serial/kgdb_8250.c b/drivers/serial/kgdb_8250.c
--- a/drivers/serial/kgdb_8250.c Wed Feb 25 14:21:26 2004
+++ b/drivers/serial/kgdb_8250.c Wed Feb 25 14:21:26 2004
@@ -1,137 +1,218 @@
/*
* 8250 interface for kgdb.
*
- * Restructured for making kgdb capable of handling different types of serial
- * interfaces, by Amit Kale (amitkale@xxxxxxxxxxxxx)
- *
- * Written (hacked together) by David Grothe (dave@xxxxxxxx)
- *
- * Modified by Scott Foehner (sfoehner@xxxxxxxxxxxx) to allow connect
- * on boot-up
+ * This is a merging of many different drivers, and all of the people have
+ * had an impact in some form or another:
*
+ * Amit Kale <amitkale@xxxxxxxxxxxxx>
+ * David Grothe <dave@xxxxxxxx>
+ * Scott Foehner <sfoehner@xxxxxxxxxxxx>
+ * George Anzinger <george@xxxxxxxxxx>
+ * Robert Walsh <rjwalsh@xxxxxxxxxxxx>
+ * wangdi <wangdi@xxxxxxxxxxxxx>
+ * San Mehat
+ * Tom Rini <trini@xxxxxxxxxx>
*/

-#include <linux/module.h>
-#include <linux/errno.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/timer.h>
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/kgdb.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
-#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/serial_reg.h>
#include <linux/serialP.h>
-#include <linux/config.h>
-#include <linux/major.h>
-#include <linux/string.h>
-#include <linux/fcntl.h>
-#include <linux/termios.h>
-#include <linux/kgdb.h>

-#include <asm/system.h>
#include <asm/io.h>
-#include <asm/segment.h>
-#include <asm/bitops.h>
-#include <asm/system.h>
-#include <asm/irq.h>
-#include <asm/atomic.h>
+#include <asm/serial.h> /* For BASE_BAUD and SERIAL_PORT_DFNS */

#define GDB_BUF_SIZE 512 /* power of 2, please */

+#if defined(CONFIG_KGDB_9600BAUD)
+#define SERIAL_BAUD 9600
+#elif defined(CONFIG_KGDB_19200BAUD)
+#define SERIAL_BAUD 19200
+#elif defined(CONFIG_KGDB_38400BAUD)
+#define SERIAL_BAUD 38400
+#elif defined(CONFIG_KGDB_57600BAUD)
+#define SERIAL_BAUD 57600
+#elif defined(CONFIG_KGDB_115200BAUD)
+#define SERIAL_BAUD 115200
+#else
+#define SERIAL_BAUD 115200 /* Start with this if not given */
+#endif
+
+#if defined(CONFIG_KGDB_TTYS0)
+#define KGDB_PORT 0
+#elif defined(CONFIG_KGDB_TTYS1)
+#define KGDB_PORT 1
+#elif defined(CONFIG_KGDB_TTYS2)
+#define KGDB_PORT 2
+#elif defined(CONFIG_KGDB_TTYS3)
+#define KGDB_PORT 3
+#else
+#define KGDB_PORT 0 /* Start with this if not given */
+#endif
+
+int kgdb8250_baud = SERIAL_BAUD;
+int kgdb8250_ttyS = KGDB_PORT;
+
static char kgdb8250_buf[GDB_BUF_SIZE];
static int kgdb8250_buf_in_inx;
static atomic_t kgdb8250_buf_in_cnt;
static int kgdb8250_buf_out_inx;

-static int kgdb8250_got_dollar = -3, kgdb8250_got_H = -3,
- kgdb8250_interrupt_iteration = 0;
+/* Determine serial information. */
+static struct serial_state state = {
+ .magic = SSTATE_MAGIC,
+ .baud_base = BASE_BAUD,
+ .custom_divisor = BASE_BAUD / SERIAL_BAUD,
+};

-/* We only allow for 4 ports to be registered. We default to standard
- * PC values. */
-static struct uart_port rs_table[4] = {
- {.line = 0x3f8,.irq = 4},
- {.line = 0x2f8,.irq = 3},
- {.line = 0x3e8,.irq = 4},
- {.line = 0x2e8,.irq = 3},
+static struct async_struct gdb_async_info = {
+ .magic = SERIAL_MAGIC,
+ .state = &state,
+ .tty = (struct tty_struct *) &state,
};
-static void (*serial_outb) (unsigned char, unsigned long);
-static unsigned long (*serial_inb) (unsigned long);
+
+/* Space between registers. */
+static int reg_shift;
+
+/* Not all arches define this. */
+#ifndef SERIAL_PORT_DFNS
+#define SERIAL_PORT_DFNS
+#endif
+static struct serial_state rs_table[] = {
+ SERIAL_PORT_DFNS /* defined in <asm/serial.h> */
+};
+
+/* Do we need to look in the rs_table? */
+static int serial_from_rs_table = 0;
+
+static void (*serial_outb) (unsigned char val, unsigned long addr);
+static unsigned long (*serial_inb) (unsigned long addr);

int serial8250_release_irq(int irq);

-int kgdb8250_irq;
-unsigned long kgdb8250_port;
+static int kgdb8250_init(void);
+static unsigned long kgdb8250_port;

-int kgdb8250_baud = 115200;
-int kgdb8250_ttyS;
+static int initialized = -1;

-static unsigned long direct_inb(unsigned long addr)
+static unsigned long
+direct_inb(unsigned long addr)
{
return readb(addr);
}

-static void direct_outb(unsigned char val, unsigned long addr)
+static void
+direct_outb(unsigned char val, unsigned long addr)
{
writeb(val, addr);
}

-static unsigned long io_inb(unsigned long port)
+static unsigned long
+io_inb(unsigned long port)
{
return inb(port);
}

-static void io_outb(unsigned char val, unsigned long port)
+static void
+io_outb(unsigned char val, unsigned long port)
{
outb(val, port);
}

/*
- * Get a byte from the hardware data buffer and return it
- * Get a char if available, return -EAGAIN if nothing available.
+ * Wait until the interface can accept a char, then write it.
*/
-static int read_data_bfr(void)
+void
+kgdb_put_debug_char(int chr)
{
- if (serial_inb(kgdb8250_port + UART_LSR) & UART_LSR_DR)
- return (serial_inb(kgdb8250_port + UART_RX));
+ while (!(serial_inb(kgdb8250_port + (UART_LSR << reg_shift)) &
+ UART_LSR_THRE))
+ ;

- return -EAGAIN;
+ serial_outb(chr, kgdb8250_port + (UART_TX << reg_shift));
}

/*
- * Empty the receive buffer first, then look at the interface hardware.
- * It waits for a character from the serial interface and then returns it.
+ * Get a byte from the hardware data buffer and return it
*/
-static int kgdb8250_read_char(void)
+static int
+read_data_bfr(void)
{
- int retchar;
- if (atomic_read(&kgdb8250_buf_in_cnt) != 0) {
- /* intr routine has q'd chars read them from buffer */
- int chr;
+ char it = serial_inb(kgdb8250_port + (UART_LSR << reg_shift));

- chr = kgdb8250_buf[kgdb8250_buf_out_inx++];
- kgdb8250_buf_out_inx &= (GDB_BUF_SIZE - 1);
- atomic_dec(&kgdb8250_buf_in_cnt);
- return chr;
+ if (it & UART_LSR_DR)
+ return serial_inb(kgdb8250_port + (UART_RX << reg_shift));
+
+ /*
+ * If we have a framing error assume somebody messed with
+ * our uart. Reprogram it and send '-' both ways...
+ */
+ if (it & 0xc) {
+ kgdb8250_init();
+ kgdb_put_debug_char('-');
+ return '-';
}
- do {
- /* read from hardware */
- retchar = read_data_bfr();
- } while (retchar < 0);
- return retchar;
+
+ return -1;
}

/*
- * Wait until the interface can accept a char, then write it.
+ * Get a char if available, return -1 if nothing available.
+ * Empty the receive buffer first, then look at the interface hardware.
+ *
+ * Locking here is a bit of a problem. We MUST not lock out communication
+ * if we are trying to talk to gdb about a kgdb entry. ON the other hand
+ * we can loose chars in the console pass thru if we don't lock. It is also
+ * possible that we could hold the lock or be waiting for it when kgdb
+ * NEEDS to talk. Since kgdb locks down the world, it does not need locks.
+ * We do, of course have possible issues with interrupting a uart operation,
+ * but we will just depend on the uart status to help keep that straight.
*/
-static void kgdb8250_write_char(int chr)
+
+static spinlock_t uart_interrupt_lock = SPIN_LOCK_UNLOCKED;
+#ifdef CONFIG_SMP
+extern spinlock_t kgdb_spinlock;
+#endif
+
+int
+kgdb_get_debug_char(void)
{
- while (!(serial_inb(kgdb8250_port + UART_LSR) & UART_LSR_THRE))
- /* Do nothing */ ;
+ int retchr;
+ unsigned long flags;
+ local_irq_save(flags);
+#ifdef CONFIG_SMP
+ if (!spin_is_locked(&kgdb_spinlock)) {
+ spin_lock(&uart_interrupt_lock);
+ }
+#endif
+ /* intr routine has q'd chars */
+ if (atomic_read(&kgdb8250_buf_in_cnt) != 0) {
+ retchr = kgdb8250_buf[kgdb8250_buf_out_inx++];
+ kgdb8250_buf_out_inx &= (GDB_BUF_SIZE - 1);
+ atomic_dec(&kgdb8250_buf_in_cnt);
+ goto out;
+ }
+
+ do {
+ retchr = read_data_bfr();
+ } while (retchr < 0);

- serial_outb(chr, kgdb8250_port + UART_TX);
+out:
+#ifdef CONFIG_SMP
+ if (!spin_is_locked(&kgdb_spinlock)) {
+ spin_unlock(&uart_interrupt_lock);
+ }
+#endif
+ local_irq_restore(flags);

+ return retchr;
}

/*
@@ -139,12 +220,12 @@
* It will receive a limited number of characters of input
* from the gdb host machine and save them up in a buffer.
*
- * When kgdb8250_read_char() is called it
+ * When kgdb_get_debug_char() is called it
* draws characters out of the buffer until it is empty and
* then reads directly from the serial port.
*
* We do not attempt to write chars from the interrupt routine
- * since the stubs do all of that via kgdb8250_write_char() which
+ * since the stubs do all of that via kgdb_put_debug_char() which
* writes one byte after waiting for the interface to become
* ready.
*
@@ -156,15 +237,27 @@
* care to learn can make this work for any low level serial
* driver.
*/
-static irqreturn_t kgdb8250_interrupt(int irq, void *dev_id,
- struct pt_regs *regs)
+static irqreturn_t
+kgdb8250_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
- int chr;
- int iir;
+ int chr, iir;
+ unsigned long flags;
+
+ if (irq != gdb_async_info.line)
+ return IRQ_NONE;
+
+ /* If we get an interrupt, then KGDB is trying to connect. */
+ if (!kgdb_connected) {
+ breakpoint();
+ return IRQ_HANDLED;
+ }
+
+ local_irq_save(flags);
+ spin_lock(&uart_interrupt_lock);

do {
chr = read_data_bfr();
- iir = serial_inb(kgdb8250_port + UART_IIR);
+ iir = serial_inb(kgdb8250_port + (UART_IIR << reg_shift));
if (chr < 0)
continue;

@@ -174,28 +267,6 @@
continue;
}

- if (atomic_read(&kgdb_killed_or_detached)) {
- if (chr == '$')
- kgdb8250_got_dollar =
- kgdb8250_interrupt_iteration;
- if (kgdb8250_interrupt_iteration ==
- kgdb8250_got_dollar + 1 && chr == 'H')
- kgdb8250_got_H = kgdb8250_interrupt_iteration;
- else if (kgdb8250_interrupt_iteration ==
- kgdb8250_got_H + 1 && chr == 'c') {
- kgdb8250_buf[kgdb8250_buf_in_inx++] = chr;
- atomic_inc(&kgdb8250_buf_in_cnt);
- atomic_set(&kgdb_might_be_resumed, 1);
- wmb();
- breakpoint();
- atomic_set(&kgdb_might_be_resumed, 0);
- kgdb8250_interrupt_iteration = 0;
- kgdb8250_got_dollar = -3;
- kgdb8250_got_H = -3;
- continue;
- }
- }
-
if (atomic_read(&kgdb8250_buf_in_cnt) >= GDB_BUF_SIZE) {
/* buffer overflow, clear it */
kgdb8250_buf_in_inx = 0;
@@ -207,33 +278,30 @@
kgdb8250_buf[kgdb8250_buf_in_inx++] = chr;
kgdb8250_buf_in_inx &= (GDB_BUF_SIZE - 1);
atomic_inc(&kgdb8250_buf_in_cnt);
- }
- while (iir & UART_IIR_RDI);
+ } while (iir & UART_IIR_RDI);

- if (atomic_read(&kgdb_killed_or_detached))
- kgdb8250_interrupt_iteration++;
+ spin_unlock(&uart_interrupt_lock);
+ local_irq_restore(flags);

return IRQ_HANDLED;
-
}

/*
- * Initializes serial port.
- * ttyS - integer specifying which serial port to use for debugging
- * baud - baud rate of specified serial port
+ * Returns:
+ * 0 on success, 1 on failure.
*/
-static int kgdb8250_init(int ttyS, int baud)
+static int
+kgdb8250_init(void)
{
unsigned cval;
int bits = 8;
int parity = 'n';
int cflag = CREAD | HUPCL | CLOCAL;
- int quot = 0;

/*
* Now construct a cflag setting.
*/
- switch (baud) {
+ switch (kgdb8250_baud) {
case 1200:
cflag |= B1200;
break;
@@ -256,7 +324,7 @@
cflag |= B115200;
break;
default:
- baud = 9600;
+ kgdb8250_baud = 9600;
/* Fall through */
case 9600:
cflag |= B9600;
@@ -287,7 +355,6 @@
*
*/

- quot = (1843200 / 16) / baud;
cval = cflag & (CSIZE | CSTOPB);
cval >>= 4;
if (cflag & PARENB)
@@ -300,75 +367,118 @@
* and set speed.
*/
cval = 0x3;
- serial_outb(cval | UART_LCR_DLAB, kgdb8250_port + UART_LCR); /* set DLAB */
- serial_outb(quot & 0xff, kgdb8250_port + UART_DLL); /* LS of divisor */
- serial_outb(quot >> 8, kgdb8250_port + UART_DLM); /* MS of divisor */
- serial_outb(cval, kgdb8250_port + UART_LCR); /* reset DLAB */
- serial_outb(UART_IER_RDI, kgdb8250_port + UART_IER); /* turn on interrupts */
+ /* set DLAB */
+ serial_outb(cval | UART_LCR_DLAB, kgdb8250_port +
+ (UART_LCR << reg_shift));
+ /* LS */
+ serial_outb(gdb_async_info.state->custom_divisor & 0xff,
+ kgdb8250_port + (UART_DLL << reg_shift));
+ /* MS */
+ serial_outb(gdb_async_info.state->custom_divisor >> 8,
+ kgdb8250_port + (UART_DLM << reg_shift));
+ /* reset DLAB */
+ serial_outb(cval, kgdb8250_port + (UART_LCR << reg_shift));
+ /* turn on interrupts */
+ serial_outb(UART_IER_RDI, kgdb8250_port + (UART_IER << reg_shift));
serial_outb(UART_MCR_OUT2 | UART_MCR_DTR | UART_MCR_RTS,
- kgdb8250_port + UART_MCR);
+ kgdb8250_port + (UART_MCR << reg_shift));

/*
* If we read 0xff from the LSR, there is no UART here.
*/
- if (serial_inb(kgdb8250_port + UART_LSR) == 0xff)
- return -ENODEV;
+ if (serial_inb(kgdb8250_port + (UART_LSR << reg_shift)) == 0xff)
+ return -1;
return 0;
}

-int kgdb8250_hook(void)
+int
+kgdb_hook_io(void)
{
int retval;

- /*
- * Set port and irq number.
- */
- kgdb8250_irq = rs_table[kgdb8250_ttyS].irq;
- switch (rs_table[kgdb8250_ttyS].iotype) {
+ /* Setup any serial port information we may need to */
+#ifdef CONFIG_KGDB_SIMPLE_SERIAL
+ /* We must look in the rs_table[]. */
+ serial_from_rs_table = 1;
+#endif
+ /* If the user has overriden our definitions, or if we've only
+ * been told the ttyS to use, look at rs_table. */
+ if (serial_from_rs_table) {
+ /* The user has selected one of ttyS[0-3], which we pull
+ * from rs_table[]. If this doesn't exist, user error. */
+ gdb_async_info.port = gdb_async_info.state->port =
+ rs_table[KGDB_PORT].port;
+ gdb_async_info.line = gdb_async_info.state->irq =
+ rs_table[KGDB_PORT].irq;
+ gdb_async_info.state->io_type = rs_table[KGDB_PORT].io_type;
+ reg_shift = rs_table[KGDB_PORT].iomem_reg_shift;
+ }
+
+ switch (gdb_async_info.state->io_type) {
case SERIAL_IO_MEM:
- kgdb8250_port = (unsigned long)rs_table[kgdb8250_ttyS].membase;
- serial_inb = direct_inb;
+ kgdb8250_port = (unsigned long)
+ rs_table[kgdb8250_ttyS].iomem_base;
serial_outb = direct_outb;
+ serial_inb = direct_inb;
break;
+ case SERIAL_IO_PORT:
default:
- kgdb8250_port = rs_table[kgdb8250_ttyS].line;
- serial_inb = io_inb;
+ kgdb8250_port = rs_table[kgdb8250_ttyS].port;
serial_outb = io_outb;
+ serial_inb = io_inb;
}

+#ifndef CONFIG_KGDB_SIMPLE_SERIAL
+ /* The user has provided the IRQ and I/O location. */
+ kgdb8250_port = gdb_async_info.port = gdb_async_info.state->port =
+ CONFIG_KGDB_PORT;
+ gdb_async_info.line = gdb_async_info.state->irq = CONFIG_KGDB_IRQ;
+#endif
+
#ifdef CONFIG_SERIAL_8250
- if ((retval = serial8250_release_irq(kgdb8250_irq)) < 0)
- return retval;
+ if (serial8250_release_irq(gdb_async_info.line))
+ return -1;
#endif

- if ((retval = kgdb8250_init(kgdb8250_ttyS, kgdb8250_baud)) < 0)
- return retval;
+ if (kgdb8250_init() == -1)
+ return -1;

- retval = request_irq(kgdb8250_irq, kgdb8250_interrupt, SA_INTERRUPT,
- "GDB-stub", NULL);
- return retval;
-}
+ retval = request_irq(gdb_async_info.line, kgdb8250_interrupt,
+ SA_INTERRUPT, "GDB-stub", NULL);
+ if (retval == 0)
+ initialized = 1;
+ else
+ initialized = 0;

-void kgdb8250_add_port(int i, struct uart_port *serial_req)
-{
- rs_table[i].iotype = serial_req->iotype;
- rs_table[i].line = serial_req->line;
- rs_table[i].membase = serial_req->membase;
- rs_table[i].regshift = serial_req->regshift;
+ return 0;
}

struct kgdb_serial kgdb8250_serial_driver = {
- .read_char = kgdb8250_read_char,
- .write_char = kgdb8250_write_char,
- .hook = kgdb8250_hook
+ .read_char = kgdb_get_debug_char,
+ .write_char = kgdb_put_debug_char,
+ .hook = kgdb_hook_io,
};

+void
+kgdb8250_add_port(int i, struct uart_port *serial_req)
+{
+ rs_table[i].io_type = serial_req->iotype;
+ rs_table[i].port = serial_req->line;
+ rs_table[i].irq = serial_req->irq;
+ rs_table[i].iomem_base = serial_req->membase;
+ rs_table[i].iomem_reg_shift = serial_req->regshift;
+
+ /* We will want to look in the rs_table now. */
+ serial_from_rs_table = 1;
+}
+
/*
* Syntax for this cmdline option is
* kgdb8250=ttyno,baudrate
*/

-static int __init kgdb8250_opt(char *str)
+static int __init
+kgdb8250_opt(char *str)
{
if (*str < '0' || *str > '3')
goto errout;
@@ -382,7 +492,12 @@
kgdb8250_baud != 38400 && kgdb8250_baud != 57600 &&
kgdb8250_baud != 115200)
goto errout;
+
+ /* Make the baud rate change happen. */
+ gdb_async_info.state->custom_divisor = BASE_BAUD / kgdb8250_baud;
+
kgdb_serial = &kgdb8250_serial_driver;
+
return 1;

errout:
diff -Nru a/include/linux/kgdb.h b/include/linux/kgdb.h
--- a/include/linux/kgdb.h Wed Feb 25 14:21:26 2004
+++ b/include/linux/kgdb.h Wed Feb 25 14:21:26 2004
@@ -25,6 +25,8 @@
extern atomic_t kgdb_killed_or_detached;
extern atomic_t kgdb_might_be_resumed;

+extern volatile int kgdb_connected;
+
extern struct task_struct *kgdb_usethread, *kgdb_contthread;

enum kgdb_bptype {
diff -Nru a/kernel/kgdb.c b/kernel/kgdb.c
--- a/kernel/kgdb.c Wed Feb 25 14:21:26 2004
+++ b/kernel/kgdb.c Wed Feb 25 14:21:26 2004
@@ -63,7 +63,7 @@
* has connected to kgdb.
*/
int kgdb_initialized = 0;
-static volatile int kgdb_connected;
+volatile int kgdb_connected;

/* If non-zero, wait for a gdb connection when kgdb_entry is called */
int kgdb_enter = 0;
@@ -214,6 +214,7 @@
do {
/* wait around for the start character, ignore all other characters */
while ((ch = (kgdb_serial->read_char() & 0x7f)) != '$') ;
+ kgdb_connected = 1;
checksum = 0;
xmitcsum = -1;

--
Tom Rini
http://gate.crashing.org/~trini/
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