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Merge branch 'dbg-early-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb

Browse source 
* 'dbg-early-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb:
  echi-dbgp: Add kernel debugger support for the usb debug port
  earlyprintk,vga,kdb: Fix \b and \r for earlyprintk=vga with kdb
  kgdboc: Add ekgdboc for early use of the kernel debugger
  x86,early dr regs,kgdb: Allow kernel debugger early dr register access
  x86,kgdb: Implement early hardware breakpoint debugging
  x86, kgdb, init: Add early and late debug states
  x86, kgdb: early trap init for early debug
This commit is contained in:
Linus Torvalds 2010-05-21 11:10:41 -07:00
commit ac3ee84c60
12 changed files with 255 additions and 36 deletions
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120
drivers/usb/early/ehci-dbgp.c
View file

@ -19,6 +19,9 @@
#include <linux/usb/ch9.h>
#include <linux/usb/ehci_def.h>
#include <linux/delay.h>
#include <linux/serial_core.h>
#include <linux/kgdb.h>
#include <linux/kthread.h>
#include <asm/io.h>
#include <asm/pci-direct.h>
#include <asm/fixmap.h>
@ -55,6 +58,7 @@ static struct ehci_regs __iomem *ehci_regs;
static struct ehci_dbg_port __iomem *ehci_debug;
static int dbgp_not_safe; /* Cannot use debug device during ehci reset */
static unsigned int dbgp_endpoint_out;
static unsigned int dbgp_endpoint_in;
struct ehci_dev {
u32 bus;
@ -91,6 +95,13 @@ static inline u32 dbgp_len_update(u32 x, u32 len)
return (x & ~0x0f) | (len & 0x0f);
}
#ifdef CONFIG_KGDB
static struct kgdb_io kgdbdbgp_io_ops;
#define dbgp_kgdb_mode (dbg_io_ops == &kgdbdbgp_io_ops)
#else
#define dbgp_kgdb_mode (0)
#endif
/*
* USB Packet IDs (PIDs)
*/
@ -182,11 +193,10 @@ static void dbgp_breath(void)
/* Sleep to give the debug port a chance to breathe */
}
static int dbgp_wait_until_done(unsigned ctrl)
static int dbgp_wait_until_done(unsigned ctrl, int loop)
{
u32 pids, lpid;
int ret;
int loop = DBGP_LOOPS;
retry:
writel(ctrl | DBGP_GO, &ehci_debug->control);
@ -276,13 +286,13 @@ static int dbgp_bulk_write(unsigned devnum, unsigned endpoint,
dbgp_set_data(bytes, size);
writel(addr, &ehci_debug->address);
writel(pids, &ehci_debug->pids);
ret = dbgp_wait_until_done(ctrl);
ret = dbgp_wait_until_done(ctrl, DBGP_LOOPS);
return ret;
}
static int dbgp_bulk_read(unsigned devnum, unsigned endpoint, void *data,
int size)
int size, int loops)
{
u32 pids, addr, ctrl;
int ret;
@ -302,7 +312,7 @@ static int dbgp_bulk_read(unsigned devnum, unsigned endpoint, void *data,
writel(addr, &ehci_debug->address);
writel(pids, &ehci_debug->pids);
ret = dbgp_wait_until_done(ctrl);
ret = dbgp_wait_until_done(ctrl, loops);
if (ret < 0)
return ret;
@ -343,12 +353,12 @@ static int dbgp_control_msg(unsigned devnum, int requesttype,
dbgp_set_data(&req, sizeof(req));
writel(addr, &ehci_debug->address);
writel(pids, &ehci_debug->pids);
ret = dbgp_wait_until_done(ctrl);
ret = dbgp_wait_until_done(ctrl, DBGP_LOOPS);
if (ret < 0)
return ret;
/* Read the result */
return dbgp_bulk_read(devnum, 0, data, size);
return dbgp_bulk_read(devnum, 0, data, size, DBGP_LOOPS);
}
/* Find a PCI capability */
@ -559,6 +569,7 @@ try_again:
goto err;
}
dbgp_endpoint_out = dbgp_desc.bDebugOutEndpoint;
dbgp_endpoint_in = dbgp_desc.bDebugInEndpoint;
/* Move the device to 127 if it isn't already there */
if (devnum != USB_DEBUG_DEVNUM) {
@ -968,8 +979,9 @@ int dbgp_reset_prep(void)
if (!ehci_debug)
return 0;
if (early_dbgp_console.index != -1 &&
!(early_dbgp_console.flags & CON_BOOT))
if ((early_dbgp_console.index != -1 &&
!(early_dbgp_console.flags & CON_BOOT)) ||
dbgp_kgdb_mode)
return 1;
/* This means the console is not initialized, or should get
* shutdown so as to allow for reuse of the usb device, which
@ -982,3 +994,93 @@ int dbgp_reset_prep(void)
return 0;
}
EXPORT_SYMBOL_GPL(dbgp_reset_prep);
#ifdef CONFIG_KGDB
static char kgdbdbgp_buf[DBGP_MAX_PACKET];
static int kgdbdbgp_buf_sz;
static int kgdbdbgp_buf_idx;
static int kgdbdbgp_loop_cnt = DBGP_LOOPS;
static int kgdbdbgp_read_char(void)
{
int ret;
if (kgdbdbgp_buf_idx < kgdbdbgp_buf_sz) {
char ch = kgdbdbgp_buf[kgdbdbgp_buf_idx++];
return ch;
}
ret = dbgp_bulk_read(USB_DEBUG_DEVNUM, dbgp_endpoint_in,
&kgdbdbgp_buf, DBGP_MAX_PACKET,
kgdbdbgp_loop_cnt);
if (ret <= 0)
return NO_POLL_CHAR;
kgdbdbgp_buf_sz = ret;
kgdbdbgp_buf_idx = 1;
return kgdbdbgp_buf[0];
}
static void kgdbdbgp_write_char(u8 chr)
{
early_dbgp_write(NULL, &chr, 1);
}
static struct kgdb_io kgdbdbgp_io_ops = {
.name = "kgdbdbgp",
.read_char = kgdbdbgp_read_char,
.write_char = kgdbdbgp_write_char,
};
static int kgdbdbgp_wait_time;
static int __init kgdbdbgp_parse_config(char *str)
{
char *ptr;
if (!ehci_debug) {
if (early_dbgp_init(str))
return -1;
}
ptr = strchr(str, ',');
if (ptr) {
ptr++;
kgdbdbgp_wait_time = simple_strtoul(ptr, &ptr, 10);
}
kgdb_register_io_module(&kgdbdbgp_io_ops);
kgdbdbgp_io_ops.is_console = early_dbgp_console.index != -1;
return 0;
}
early_param("kgdbdbgp", kgdbdbgp_parse_config);
static int kgdbdbgp_reader_thread(void *ptr)
{
int ret;
while (readl(&ehci_debug->control) & DBGP_ENABLED) {
kgdbdbgp_loop_cnt = 1;
ret = kgdbdbgp_read_char();
kgdbdbgp_loop_cnt = DBGP_LOOPS;
if (ret != NO_POLL_CHAR) {
if (ret == 0x3 || ret == '$') {
if (ret == '$')
kgdbdbgp_buf_idx--;
kgdb_breakpoint();
}
continue;
}
schedule_timeout_interruptible(kgdbdbgp_wait_time * HZ);
}
return 0;
}
static int __init kgdbdbgp_start_thread(void)
{
if (dbgp_kgdb_mode && kgdbdbgp_wait_time)
kthread_run(kgdbdbgp_reader_thread, NULL, "%s", "dbgp");
return 0;
}
module_init(kgdbdbgp_start_thread);
#endif /* CONFIG_KGDB */