From: Colin Cross Date: Thu, 3 Apr 2014 01:30:04 +0000 (-0700) Subject: ANDROID: fiq_debugger: move into drivers/staging/android/fiq_debugger/ X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0dc1cccb4fa24ef58141a03ce14c6a2a1eba4cfc;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git ANDROID: fiq_debugger: move into drivers/staging/android/fiq_debugger/ Move fiq_debugger into drivers/staging/android/fiq_debugger/ to allow for sharing between ARM and ARM64. Change-Id: I6ca5e8b7e3d000f57da3234260261c5592cef2a8 Signed-off-by: Colin Cross --- diff --git a/arch/arm/common/Kconfig b/arch/arm/common/Kconfig index 8e67a799f65b..f07f47943bf3 100644 --- a/arch/arm/common/Kconfig +++ b/arch/arm/common/Kconfig @@ -19,49 +19,3 @@ config SHARP_SCOOP config FIQ_GLUE bool select FIQ - -config FIQ_DEBUGGER - bool "FIQ Mode Serial Debugger" - select FIQ - select FIQ_GLUE - default n - help - The FIQ serial debugger can accept commands even when the - kernel is unresponsive due to being stuck with interrupts - disabled. - - -config FIQ_DEBUGGER_NO_SLEEP - bool "Keep serial debugger active" - depends on FIQ_DEBUGGER - default n - help - Enables the serial debugger at boot. Passing - fiq_debugger.no_sleep on the kernel commandline will - override this config option. - -config FIQ_DEBUGGER_WAKEUP_IRQ_ALWAYS_ON - bool "Don't disable wakeup IRQ when debugger is active" - depends on FIQ_DEBUGGER - default n - help - Don't disable the wakeup irq when enabling the uart clock. This will - cause extra interrupts, but it makes the serial debugger usable with - on some MSM radio builds that ignore the uart clock request in power - collapse. - -config FIQ_DEBUGGER_CONSOLE - bool "Console on FIQ Serial Debugger port" - depends on FIQ_DEBUGGER - default n - help - Enables a console so that printk messages are displayed on - the debugger serial port as the occur. - -config FIQ_DEBUGGER_CONSOLE_DEFAULT_ENABLE - bool "Put the FIQ debugger into console mode by default" - depends on FIQ_DEBUGGER_CONSOLE - default n - help - If enabled, this puts the fiq debugger into console mode by default. - Otherwise, the fiq debugger will start out in debug mode. diff --git a/arch/arm/common/Makefile b/arch/arm/common/Makefile index 44e5ed7ffd4c..10b506469c95 100644 --- a/arch/arm/common/Makefile +++ b/arch/arm/common/Makefile @@ -5,7 +5,6 @@ obj-y += firmware.o -obj-$(CONFIG_FIQ_DEBUGGER) += fiq_debugger.o obj-$(CONFIG_FIQ_GLUE) += fiq_glue.o fiq_glue_setup.o obj-$(CONFIG_SA1111) += sa1111.o obj-$(CONFIG_DMABOUNCE) += dmabounce.o diff --git a/arch/arm/common/fiq_debugger.c b/arch/arm/common/fiq_debugger.c deleted file mode 100644 index e233899dec23..000000000000 --- a/arch/arm/common/fiq_debugger.c +++ /dev/null @@ -1,1376 +0,0 @@ -/* - * arch/arm/common/fiq_debugger.c - * - * Serial Debugger Interface accessed through an FIQ interrupt. - * - * Copyright (C) 2008 Google, Inc. - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * 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. - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include - -#include - -#include "fiq_debugger_ringbuf.h" - -#define DEBUG_MAX 64 -#define MAX_UNHANDLED_FIQ_COUNT 1000000 - -#define MAX_FIQ_DEBUGGER_PORTS 4 - -#define THREAD_INFO(sp) ((struct thread_info *) \ - ((unsigned long)(sp) & ~(THREAD_SIZE - 1))) - -struct fiq_debugger_state { - struct fiq_glue_handler handler; - - int fiq; - int uart_irq; - int signal_irq; - int wakeup_irq; - bool wakeup_irq_no_set_wake; - struct clk *clk; - struct fiq_debugger_pdata *pdata; - struct platform_device *pdev; - - char debug_cmd[DEBUG_MAX]; - int debug_busy; - int debug_abort; - - char debug_buf[DEBUG_MAX]; - int debug_count; - - bool no_sleep; - bool debug_enable; - bool ignore_next_wakeup_irq; - struct timer_list sleep_timer; - spinlock_t sleep_timer_lock; - bool uart_enabled; - struct wake_lock debugger_wake_lock; - bool console_enable; - int current_cpu; - atomic_t unhandled_fiq_count; - bool in_fiq; - - struct work_struct work; - spinlock_t work_lock; - char work_cmd[DEBUG_MAX]; - -#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE - spinlock_t console_lock; - struct console console; - struct tty_port tty_port; - struct fiq_debugger_ringbuf *tty_rbuf; - bool syslog_dumping; -#endif - - unsigned int last_irqs[NR_IRQS]; - unsigned int last_local_timer_irqs[NR_CPUS]; -}; - -#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE -struct tty_driver *fiq_tty_driver; -#endif - -#ifdef CONFIG_FIQ_DEBUGGER_NO_SLEEP -static bool initial_no_sleep = true; -#else -static bool initial_no_sleep; -#endif - -#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE_DEFAULT_ENABLE -static bool initial_debug_enable = true; -static bool initial_console_enable = true; -#else -static bool initial_debug_enable; -static bool initial_console_enable; -#endif - -static bool fiq_kgdb_enable; - -module_param_named(no_sleep, initial_no_sleep, bool, 0644); -module_param_named(debug_enable, initial_debug_enable, bool, 0644); -module_param_named(console_enable, initial_console_enable, bool, 0644); -module_param_named(kgdb_enable, fiq_kgdb_enable, bool, 0644); - -#ifdef CONFIG_FIQ_DEBUGGER_WAKEUP_IRQ_ALWAYS_ON -static inline void enable_wakeup_irq(struct fiq_debugger_state *state) {} -static inline void disable_wakeup_irq(struct fiq_debugger_state *state) {} -#else -static inline void enable_wakeup_irq(struct fiq_debugger_state *state) -{ - if (state->wakeup_irq < 0) - return; - enable_irq(state->wakeup_irq); - if (!state->wakeup_irq_no_set_wake) - enable_irq_wake(state->wakeup_irq); -} -static inline void disable_wakeup_irq(struct fiq_debugger_state *state) -{ - if (state->wakeup_irq < 0) - return; - disable_irq_nosync(state->wakeup_irq); - if (!state->wakeup_irq_no_set_wake) - disable_irq_wake(state->wakeup_irq); -} -#endif - -static bool inline debug_have_fiq(struct fiq_debugger_state *state) -{ - return (state->fiq >= 0); -} - -static void debug_force_irq(struct fiq_debugger_state *state) -{ - unsigned int irq = state->signal_irq; - - if (WARN_ON(!debug_have_fiq(state))) - return; - if (state->pdata->force_irq) { - state->pdata->force_irq(state->pdev, irq); - } else { - struct irq_chip *chip = irq_get_chip(irq); - if (chip && chip->irq_retrigger) - chip->irq_retrigger(irq_get_irq_data(irq)); - } -} - -static void debug_uart_enable(struct fiq_debugger_state *state) -{ - if (state->clk) - clk_enable(state->clk); - if (state->pdata->uart_enable) - state->pdata->uart_enable(state->pdev); -} - -static void debug_uart_disable(struct fiq_debugger_state *state) -{ - if (state->pdata->uart_disable) - state->pdata->uart_disable(state->pdev); - if (state->clk) - clk_disable(state->clk); -} - -static void debug_uart_flush(struct fiq_debugger_state *state) -{ - if (state->pdata->uart_flush) - state->pdata->uart_flush(state->pdev); -} - -static void debug_putc(struct fiq_debugger_state *state, char c) -{ - state->pdata->uart_putc(state->pdev, c); -} - -static void debug_puts(struct fiq_debugger_state *state, char *s) -{ - unsigned c; - while ((c = *s++)) { - if (c == '\n') - debug_putc(state, '\r'); - debug_putc(state, c); - } -} - -static void debug_prompt(struct fiq_debugger_state *state) -{ - debug_puts(state, "debug> "); -} - -static void dump_kernel_log(struct fiq_debugger_state *state) -{ - char buf[512]; - size_t len; - struct kmsg_dumper dumper = { .active = true }; - - - kmsg_dump_rewind_nolock(&dumper); - while (kmsg_dump_get_line_nolock(&dumper, true, buf, - sizeof(buf) - 1, &len)) { - buf[len] = 0; - debug_puts(state, buf); - } -} - -static char *mode_name(unsigned cpsr) -{ - switch (cpsr & MODE_MASK) { - case USR_MODE: return "USR"; - case FIQ_MODE: return "FIQ"; - case IRQ_MODE: return "IRQ"; - case SVC_MODE: return "SVC"; - case ABT_MODE: return "ABT"; - case UND_MODE: return "UND"; - case SYSTEM_MODE: return "SYS"; - default: return "???"; - } -} - -static int debug_printf(void *cookie, const char *fmt, ...) -{ - struct fiq_debugger_state *state = cookie; - char buf[256]; - va_list ap; - - va_start(ap, fmt); - vsnprintf(buf, sizeof(buf), fmt, ap); - va_end(ap); - - debug_puts(state, buf); - return state->debug_abort; -} - -/* Safe outside fiq context */ -static int debug_printf_nfiq(void *cookie, const char *fmt, ...) -{ - struct fiq_debugger_state *state = cookie; - char buf[256]; - va_list ap; - unsigned long irq_flags; - - va_start(ap, fmt); - vsnprintf(buf, 128, fmt, ap); - va_end(ap); - - local_irq_save(irq_flags); - debug_puts(state, buf); - debug_uart_flush(state); - local_irq_restore(irq_flags); - return state->debug_abort; -} - -static void dump_regs(struct fiq_debugger_state *state, unsigned *regs) -{ - debug_printf(state, " r0 %08x r1 %08x r2 %08x r3 %08x\n", - regs[0], regs[1], regs[2], regs[3]); - debug_printf(state, " r4 %08x r5 %08x r6 %08x r7 %08x\n", - regs[4], regs[5], regs[6], regs[7]); - debug_printf(state, " r8 %08x r9 %08x r10 %08x r11 %08x mode %s\n", - regs[8], regs[9], regs[10], regs[11], - mode_name(regs[16])); - if ((regs[16] & MODE_MASK) == USR_MODE) - debug_printf(state, " ip %08x sp %08x lr %08x pc %08x " - "cpsr %08x\n", regs[12], regs[13], regs[14], - regs[15], regs[16]); - else - debug_printf(state, " ip %08x sp %08x lr %08x pc %08x " - "cpsr %08x spsr %08x\n", regs[12], regs[13], - regs[14], regs[15], regs[16], regs[17]); -} - -struct mode_regs { - unsigned long sp_svc; - unsigned long lr_svc; - unsigned long spsr_svc; - - unsigned long sp_abt; - unsigned long lr_abt; - unsigned long spsr_abt; - - unsigned long sp_und; - unsigned long lr_und; - unsigned long spsr_und; - - unsigned long sp_irq; - unsigned long lr_irq; - unsigned long spsr_irq; - - unsigned long r8_fiq; - unsigned long r9_fiq; - unsigned long r10_fiq; - unsigned long r11_fiq; - unsigned long r12_fiq; - unsigned long sp_fiq; - unsigned long lr_fiq; - unsigned long spsr_fiq; -}; - -void __naked get_mode_regs(struct mode_regs *regs) -{ - asm volatile ( - "mrs r1, cpsr\n" - "msr cpsr_c, #0xd3 @(SVC_MODE | PSR_I_BIT | PSR_F_BIT)\n" - "stmia r0!, {r13 - r14}\n" - "mrs r2, spsr\n" - "msr cpsr_c, #0xd7 @(ABT_MODE | PSR_I_BIT | PSR_F_BIT)\n" - "stmia r0!, {r2, r13 - r14}\n" - "mrs r2, spsr\n" - "msr cpsr_c, #0xdb @(UND_MODE | PSR_I_BIT | PSR_F_BIT)\n" - "stmia r0!, {r2, r13 - r14}\n" - "mrs r2, spsr\n" - "msr cpsr_c, #0xd2 @(IRQ_MODE | PSR_I_BIT | PSR_F_BIT)\n" - "stmia r0!, {r2, r13 - r14}\n" - "mrs r2, spsr\n" - "msr cpsr_c, #0xd1 @(FIQ_MODE | PSR_I_BIT | PSR_F_BIT)\n" - "stmia r0!, {r2, r8 - r14}\n" - "mrs r2, spsr\n" - "stmia r0!, {r2}\n" - "msr cpsr_c, r1\n" - "bx lr\n"); -} - - -static void dump_allregs(struct fiq_debugger_state *state, unsigned *regs) -{ - struct mode_regs mode_regs; - dump_regs(state, regs); - get_mode_regs(&mode_regs); - debug_printf(state, " svc: sp %08x lr %08x spsr %08x\n", - mode_regs.sp_svc, mode_regs.lr_svc, mode_regs.spsr_svc); - debug_printf(state, " abt: sp %08x lr %08x spsr %08x\n", - mode_regs.sp_abt, mode_regs.lr_abt, mode_regs.spsr_abt); - debug_printf(state, " und: sp %08x lr %08x spsr %08x\n", - mode_regs.sp_und, mode_regs.lr_und, mode_regs.spsr_und); - debug_printf(state, " irq: sp %08x lr %08x spsr %08x\n", - mode_regs.sp_irq, mode_regs.lr_irq, mode_regs.spsr_irq); - debug_printf(state, " fiq: r8 %08x r9 %08x r10 %08x r11 %08x " - "r12 %08x\n", - mode_regs.r8_fiq, mode_regs.r9_fiq, mode_regs.r10_fiq, - mode_regs.r11_fiq, mode_regs.r12_fiq); - debug_printf(state, " fiq: sp %08x lr %08x spsr %08x\n", - mode_regs.sp_fiq, mode_regs.lr_fiq, mode_regs.spsr_fiq); -} - -static void dump_irqs(struct fiq_debugger_state *state) -{ - int n; - struct irq_desc *desc; - - debug_printf(state, "irqnr total since-last status name\n"); - for_each_irq_desc(n, desc) { - struct irqaction *act = desc->action; - if (!act && !kstat_irqs(n)) - continue; - debug_printf(state, "%5d: %10u %11u %8x %s\n", n, - kstat_irqs(n), - kstat_irqs(n) - state->last_irqs[n], - desc->status_use_accessors, - (act && act->name) ? act->name : "???"); - state->last_irqs[n] = kstat_irqs(n); - } -} - -struct stacktrace_state { - struct fiq_debugger_state *state; - unsigned int depth; -}; - -static int report_trace(struct stackframe *frame, void *d) -{ - struct stacktrace_state *sts = d; - - if (sts->depth) { - debug_printf(sts->state, - " pc: %p (%pF), lr %p (%pF), sp %p, fp %p\n", - frame->pc, frame->pc, frame->lr, frame->lr, - frame->sp, frame->fp); - sts->depth--; - return 0; - } - debug_printf(sts->state, " ...\n"); - - return sts->depth == 0; -} - -struct frame_tail { - struct frame_tail *fp; - unsigned long sp; - unsigned long lr; -} __attribute__((packed)); - -static struct frame_tail *user_backtrace(struct fiq_debugger_state *state, - struct frame_tail *tail) -{ - struct frame_tail buftail[2]; - - /* Also check accessibility of one struct frame_tail beyond */ - if (!access_ok(VERIFY_READ, tail, sizeof(buftail))) { - debug_printf(state, " invalid frame pointer %p\n", tail); - return NULL; - } - if (__copy_from_user_inatomic(buftail, tail, sizeof(buftail))) { - debug_printf(state, - " failed to copy frame pointer %p\n", tail); - return NULL; - } - - debug_printf(state, " %p\n", buftail[0].lr); - - /* frame pointers should strictly progress back up the stack - * (towards higher addresses) */ - if (tail >= buftail[0].fp) - return NULL; - - return buftail[0].fp-1; -} - -void dump_stacktrace(struct fiq_debugger_state *state, - struct pt_regs * const regs, unsigned int depth, void *ssp) -{ - struct frame_tail *tail; - struct thread_info *real_thread_info = THREAD_INFO(ssp); - struct stacktrace_state sts; - - sts.depth = depth; - sts.state = state; - *current_thread_info() = *real_thread_info; - - if (!current) - debug_printf(state, "current NULL\n"); - else - debug_printf(state, "pid: %d comm: %s\n", - current->pid, current->comm); - dump_regs(state, (unsigned *)regs); - - if (!user_mode(regs)) { - struct stackframe frame; - frame.fp = regs->ARM_fp; - frame.sp = regs->ARM_sp; - frame.lr = regs->ARM_lr; - frame.pc = regs->ARM_pc; - debug_printf(state, - " pc: %p (%pF), lr %p (%pF), sp %p, fp %p\n", - regs->ARM_pc, regs->ARM_pc, regs->ARM_lr, regs->ARM_lr, - regs->ARM_sp, regs->ARM_fp); - walk_stackframe(&frame, report_trace, &sts); - return; - } - - tail = ((struct frame_tail *) regs->ARM_fp) - 1; - while (depth-- && tail && !((unsigned long) tail & 3)) - tail = user_backtrace(state, tail); -} - -static void do_ps(struct fiq_debugger_state *state) -{ - struct task_struct *g; - struct task_struct *p; - unsigned task_state; - static const char stat_nam[] = "RSDTtZX"; - - debug_printf(state, "pid ppid prio task pc\n"); - read_lock(&tasklist_lock); - do_each_thread(g, p) { - task_state = p->state ? __ffs(p->state) + 1 : 0; - debug_printf(state, - "%5d %5d %4d ", p->pid, p->parent->pid, p->prio); - debug_printf(state, "%-13.13s %c", p->comm, - task_state >= sizeof(stat_nam) ? '?' : stat_nam[task_state]); - if (task_state == TASK_RUNNING) - debug_printf(state, " running\n"); - else - debug_printf(state, " %08lx\n", thread_saved_pc(p)); - } while_each_thread(g, p); - read_unlock(&tasklist_lock); -} - -#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE -static void begin_syslog_dump(struct fiq_debugger_state *state) -{ - state->syslog_dumping = true; -} - -static void end_syslog_dump(struct fiq_debugger_state *state) -{ - state->syslog_dumping = false; -} -#else -extern int do_syslog(int type, char __user *bug, int count); -static void begin_syslog_dump(struct fiq_debugger_state *state) -{ - do_syslog(5 /* clear */, NULL, 0); -} - -static void end_syslog_dump(struct fiq_debugger_state *state) -{ - dump_kernel_log(state); -} -#endif - -static void do_sysrq(struct fiq_debugger_state *state, char rq) -{ - if ((rq == 'g' || rq == 'G') && !fiq_kgdb_enable) { - debug_printf(state, "sysrq-g blocked\n"); - return; - } - begin_syslog_dump(state); - handle_sysrq(rq); - end_syslog_dump(state); -} - -#ifdef CONFIG_KGDB -static void do_kgdb(struct fiq_debugger_state *state) -{ - if (!fiq_kgdb_enable) { - debug_printf(state, "kgdb through fiq debugger not enabled\n"); - return; - } - - debug_printf(state, "enabling console and triggering kgdb\n"); - state->console_enable = true; - handle_sysrq('g'); -} -#endif - -static void debug_schedule_work(struct fiq_debugger_state *state, char *cmd) -{ - unsigned long flags; - - spin_lock_irqsave(&state->work_lock, flags); - if (state->work_cmd[0] != '\0') { - debug_printf(state, "work command processor busy\n"); - spin_unlock_irqrestore(&state->work_lock, flags); - return; - } - - strlcpy(state->work_cmd, cmd, sizeof(state->work_cmd)); - spin_unlock_irqrestore(&state->work_lock, flags); - - schedule_work(&state->work); -} - -static void debug_work(struct work_struct *work) -{ - struct fiq_debugger_state *state; - char work_cmd[DEBUG_MAX]; - char *cmd; - unsigned long flags; - - state = container_of(work, struct fiq_debugger_state, work); - - spin_lock_irqsave(&state->work_lock, flags); - - strlcpy(work_cmd, state->work_cmd, sizeof(work_cmd)); - state->work_cmd[0] = '\0'; - - spin_unlock_irqrestore(&state->work_lock, flags); - - cmd = work_cmd; - if (!strncmp(cmd, "reboot", 6)) { - cmd += 6; - while (*cmd == ' ') - cmd++; - if (*cmd != '\0') - kernel_restart(cmd); - else - kernel_restart(NULL); - } else { - debug_printf(state, "unknown work command '%s'\n", work_cmd); - } -} - -/* This function CANNOT be called in FIQ context */ -static void debug_irq_exec(struct fiq_debugger_state *state, char *cmd) -{ - if (!strcmp(cmd, "ps")) - do_ps(state); - if (!strcmp(cmd, "sysrq")) - do_sysrq(state, 'h'); - if (!strncmp(cmd, "sysrq ", 6)) - do_sysrq(state, cmd[6]); -#ifdef CONFIG_KGDB - if (!strcmp(cmd, "kgdb")) - do_kgdb(state); -#endif - if (!strncmp(cmd, "reboot", 6)) - debug_schedule_work(state, cmd); -} - -static void debug_help(struct fiq_debugger_state *state) -{ - debug_printf(state, "FIQ Debugger commands:\n" - " pc PC status\n" - " regs Register dump\n" - " allregs Extended Register dump\n" - " bt Stack trace\n" - " reboot [] Reboot with command \n" - " reset [] Hard reset with command \n" - " irqs Interupt status\n" - " kmsg Kernel log\n" - " version Kernel version\n"); - debug_printf(state, " sleep Allow sleep while in FIQ\n" - " nosleep Disable sleep while in FIQ\n" - " console Switch terminal to console\n" - " cpu Current CPU\n" - " cpu Switch to CPU\n"); - debug_printf(state, " ps Process list\n" - " sysrq sysrq options\n" - " sysrq Execute sysrq with \n"); -#ifdef CONFIG_KGDB - debug_printf(state, " kgdb Enter kernel debugger\n"); -#endif -} - -static void take_affinity(void *info) -{ - struct fiq_debugger_state *state = info; - struct cpumask cpumask; - - cpumask_clear(&cpumask); - cpumask_set_cpu(get_cpu(), &cpumask); - - irq_set_affinity(state->uart_irq, &cpumask); -} - -static void switch_cpu(struct fiq_debugger_state *state, int cpu) -{ - if (!debug_have_fiq(state)) - smp_call_function_single(cpu, take_affinity, state, false); - state->current_cpu = cpu; -} - -static bool debug_fiq_exec(struct fiq_debugger_state *state, - const char *cmd, unsigned *regs, void *svc_sp) -{ - bool signal_helper = false; - - if (!strcmp(cmd, "help") || !strcmp(cmd, "?")) { - debug_help(state); - } else if (!strcmp(cmd, "pc")) { - debug_printf(state, " pc %08x cpsr %08x mode %s\n", - regs[15], regs[16], mode_name(regs[16])); - } else if (!strcmp(cmd, "regs")) { - dump_regs(state, regs); - } else if (!strcmp(cmd, "allregs")) { - dump_allregs(state, regs); - } else if (!strcmp(cmd, "bt")) { - dump_stacktrace(state, (struct pt_regs *)regs, 100, svc_sp); - } else if (!strncmp(cmd, "reset", 5)) { - cmd += 5; - while (*cmd == ' ') - cmd++; - if (*cmd) { - char tmp_cmd[32]; - strlcpy(tmp_cmd, cmd, sizeof(tmp_cmd)); - machine_restart(tmp_cmd); - } else { - machine_restart(NULL); - } - } else if (!strcmp(cmd, "irqs")) { - dump_irqs(state); - } else if (!strcmp(cmd, "kmsg")) { - dump_kernel_log(state); - } else if (!strcmp(cmd, "version")) { - debug_printf(state, "%s\n", linux_banner); - } else if (!strcmp(cmd, "sleep")) { - state->no_sleep = false; - debug_printf(state, "enabling sleep\n"); - } else if (!strcmp(cmd, "nosleep")) { - state->no_sleep = true; - debug_printf(state, "disabling sleep\n"); - } else if (!strcmp(cmd, "console")) { - debug_printf(state, "console mode\n"); - debug_uart_flush(state); - state->console_enable = true; - } else if (!strcmp(cmd, "cpu")) { - debug_printf(state, "cpu %d\n", state->current_cpu); - } else if (!strncmp(cmd, "cpu ", 4)) { - unsigned long cpu = 0; - if (strict_strtoul(cmd + 4, 10, &cpu) == 0) - switch_cpu(state, cpu); - else - debug_printf(state, "invalid cpu\n"); - debug_printf(state, "cpu %d\n", state->current_cpu); - } else { - if (state->debug_busy) { - debug_printf(state, - "command processor busy. trying to abort.\n"); - state->debug_abort = -1; - } else { - strcpy(state->debug_cmd, cmd); - state->debug_busy = 1; - } - - return true; - } - if (!state->console_enable) - debug_prompt(state); - - return signal_helper; -} - -static void sleep_timer_expired(unsigned long data) -{ - struct fiq_debugger_state *state = (struct fiq_debugger_state *)data; - unsigned long flags; - - spin_lock_irqsave(&state->sleep_timer_lock, flags); - if (state->uart_enabled && !state->no_sleep) { - if (state->debug_enable && !state->console_enable) { - state->debug_enable = false; - debug_printf_nfiq(state, "suspending fiq debugger\n"); - } - state->ignore_next_wakeup_irq = true; - debug_uart_disable(state); - state->uart_enabled = false; - enable_wakeup_irq(state); - } - wake_unlock(&state->debugger_wake_lock); - spin_unlock_irqrestore(&state->sleep_timer_lock, flags); -} - -static void handle_wakeup(struct fiq_debugger_state *state) -{ - unsigned long flags; - - spin_lock_irqsave(&state->sleep_timer_lock, flags); - if (state->wakeup_irq >= 0 && state->ignore_next_wakeup_irq) { - state->ignore_next_wakeup_irq = false; - } else if (!state->uart_enabled) { - wake_lock(&state->debugger_wake_lock); - debug_uart_enable(state); - state->uart_enabled = true; - disable_wakeup_irq(state); - mod_timer(&state->sleep_timer, jiffies + HZ / 2); - } - spin_unlock_irqrestore(&state->sleep_timer_lock, flags); -} - -static irqreturn_t wakeup_irq_handler(int irq, void *dev) -{ - struct fiq_debugger_state *state = dev; - - if (!state->no_sleep) - debug_puts(state, "WAKEUP\n"); - handle_wakeup(state); - - return IRQ_HANDLED; -} - -static void debug_handle_console_irq_context(struct fiq_debugger_state *state) -{ -#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE) - if (state->tty_port.ops) { - int i; - int count = fiq_debugger_ringbuf_level(state->tty_rbuf); - for (i = 0; i < count; i++) { - int c = fiq_debugger_ringbuf_peek(state->tty_rbuf, 0); - tty_insert_flip_char(&state->tty_port, c, TTY_NORMAL); - if (!fiq_debugger_ringbuf_consume(state->tty_rbuf, 1)) - pr_warn("fiq tty failed to consume byte\n"); - } - tty_flip_buffer_push(&state->tty_port); - } -#endif -} - -static void debug_handle_irq_context(struct fiq_debugger_state *state) -{ - if (!state->no_sleep) { - unsigned long flags; - - spin_lock_irqsave(&state->sleep_timer_lock, flags); - wake_lock(&state->debugger_wake_lock); - mod_timer(&state->sleep_timer, jiffies + HZ * 5); - spin_unlock_irqrestore(&state->sleep_timer_lock, flags); - } - debug_handle_console_irq_context(state); - if (state->debug_busy) { - debug_irq_exec(state, state->debug_cmd); - if (!state->console_enable) - debug_prompt(state); - state->debug_busy = 0; - } -} - -static int debug_getc(struct fiq_debugger_state *state) -{ - return state->pdata->uart_getc(state->pdev); -} - -static bool debug_handle_uart_interrupt(struct fiq_debugger_state *state, - int this_cpu, void *regs, void *svc_sp) -{ - int c; - static int last_c; - int count = 0; - bool signal_helper = false; - - if (this_cpu != state->current_cpu) { - if (state->in_fiq) - return false; - - if (atomic_inc_return(&state->unhandled_fiq_count) != - MAX_UNHANDLED_FIQ_COUNT) - return false; - - debug_printf(state, "fiq_debugger: cpu %d not responding, " - "reverting to cpu %d\n", state->current_cpu, - this_cpu); - - atomic_set(&state->unhandled_fiq_count, 0); - switch_cpu(state, this_cpu); - return false; - } - - state->in_fiq = true; - - while ((c = debug_getc(state)) != FIQ_DEBUGGER_NO_CHAR) { - count++; - if (!state->debug_enable) { - if ((c == 13) || (c == 10)) { - state->debug_enable = true; - state->debug_count = 0; - debug_prompt(state); - } - } else if (c == FIQ_DEBUGGER_BREAK) { - state->console_enable = false; - debug_puts(state, "fiq debugger mode\n"); - state->debug_count = 0; - debug_prompt(state); -#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE - } else if (state->console_enable && state->tty_rbuf) { - fiq_debugger_ringbuf_push(state->tty_rbuf, c); - signal_helper = true; -#endif - } else if ((c >= ' ') && (c < 127)) { - if (state->debug_count < (DEBUG_MAX - 1)) { - state->debug_buf[state->debug_count++] = c; - debug_putc(state, c); - } - } else if ((c == 8) || (c == 127)) { - if (state->debug_count > 0) { - state->debug_count--; - debug_putc(state, 8); - debug_putc(state, ' '); - debug_putc(state, 8); - } - } else if ((c == 13) || (c == 10)) { - if (c == '\r' || (c == '\n' && last_c != '\r')) { - debug_putc(state, '\r'); - debug_putc(state, '\n'); - } - if (state->debug_count) { - state->debug_buf[state->debug_count] = 0; - state->debug_count = 0; - signal_helper |= - debug_fiq_exec(state, state->debug_buf, - regs, svc_sp); - } else { - debug_prompt(state); - } - } - last_c = c; - } - if (!state->console_enable) - debug_uart_flush(state); - if (state->pdata->fiq_ack) - state->pdata->fiq_ack(state->pdev, state->fiq); - - /* poke sleep timer if necessary */ - if (state->debug_enable && !state->no_sleep) - signal_helper = true; - - atomic_set(&state->unhandled_fiq_count, 0); - state->in_fiq = false; - - return signal_helper; -} - -static void debug_fiq(struct fiq_glue_handler *h, void *regs, void *svc_sp) -{ - struct fiq_debugger_state *state = - container_of(h, struct fiq_debugger_state, handler); - unsigned int this_cpu = THREAD_INFO(svc_sp)->cpu; - bool need_irq; - - need_irq = debug_handle_uart_interrupt(state, this_cpu, regs, svc_sp); - if (need_irq) - debug_force_irq(state); -} - -/* - * When not using FIQs, we only use this single interrupt as an entry point. - * This just effectively takes over the UART interrupt and does all the work - * in this context. - */ -static irqreturn_t debug_uart_irq(int irq, void *dev) -{ - struct fiq_debugger_state *state = dev; - bool not_done; - - handle_wakeup(state); - - /* handle the debugger irq in regular context */ - not_done = debug_handle_uart_interrupt(state, smp_processor_id(), - get_irq_regs(), - current_thread_info()); - if (not_done) - debug_handle_irq_context(state); - - return IRQ_HANDLED; -} - -/* - * If FIQs are used, not everything can happen in fiq context. - * FIQ handler does what it can and then signals this interrupt to finish the - * job in irq context. - */ -static irqreturn_t debug_signal_irq(int irq, void *dev) -{ - struct fiq_debugger_state *state = dev; - - if (state->pdata->force_irq_ack) - state->pdata->force_irq_ack(state->pdev, state->signal_irq); - - debug_handle_irq_context(state); - - return IRQ_HANDLED; -} - -static void debug_resume(struct fiq_glue_handler *h) -{ - struct fiq_debugger_state *state = - container_of(h, struct fiq_debugger_state, handler); - if (state->pdata->uart_resume) - state->pdata->uart_resume(state->pdev); -} - -#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE) -struct tty_driver *debug_console_device(struct console *co, int *index) -{ - *index = co->index; - return fiq_tty_driver; -} - -static void debug_console_write(struct console *co, - const char *s, unsigned int count) -{ - struct fiq_debugger_state *state; - unsigned long flags; - - state = container_of(co, struct fiq_debugger_state, console); - - if (!state->console_enable && !state->syslog_dumping) - return; - - debug_uart_enable(state); - spin_lock_irqsave(&state->console_lock, flags); - while (count--) { - if (*s == '\n') - debug_putc(state, '\r'); - debug_putc(state, *s++); - } - debug_uart_flush(state); - spin_unlock_irqrestore(&state->console_lock, flags); - debug_uart_disable(state); -} - -static struct console fiq_debugger_console = { - .name = "ttyFIQ", - .device = debug_console_device, - .write = debug_console_write, - .flags = CON_PRINTBUFFER | CON_ANYTIME | CON_ENABLED, -}; - -int fiq_tty_open(struct tty_struct *tty, struct file *filp) -{ - int line = tty->index; - struct fiq_debugger_state **states = tty->driver->driver_state; - struct fiq_debugger_state *state = states[line]; - - return tty_port_open(&state->tty_port, tty, filp); -} - -void fiq_tty_close(struct tty_struct *tty, struct file *filp) -{ - tty_port_close(tty->port, tty, filp); -} - -int fiq_tty_write(struct tty_struct *tty, const unsigned char *buf, int count) -{ - int i; - int line = tty->index; - struct fiq_debugger_state **states = tty->driver->driver_state; - struct fiq_debugger_state *state = states[line]; - - if (!state->console_enable) - return count; - - debug_uart_enable(state); - spin_lock_irq(&state->console_lock); - for (i = 0; i < count; i++) - debug_putc(state, *buf++); - spin_unlock_irq(&state->console_lock); - debug_uart_disable(state); - - return count; -} - -int fiq_tty_write_room(struct tty_struct *tty) -{ - return 16; -} - -#ifdef CONFIG_CONSOLE_POLL -static int fiq_tty_poll_init(struct tty_driver *driver, int line, char *options) -{ - return 0; -} - -static int fiq_tty_poll_get_char(struct tty_driver *driver, int line) -{ - struct fiq_debugger_state **states = driver->driver_state; - struct fiq_debugger_state *state = states[line]; - int c = NO_POLL_CHAR; - - debug_uart_enable(state); - if (debug_have_fiq(state)) { - int count = fiq_debugger_ringbuf_level(state->tty_rbuf); - if (count > 0) { - c = fiq_debugger_ringbuf_peek(state->tty_rbuf, 0); - fiq_debugger_ringbuf_consume(state->tty_rbuf, 1); - } - } else { - c = debug_getc(state); - if (c == FIQ_DEBUGGER_NO_CHAR) - c = NO_POLL_CHAR; - } - debug_uart_disable(state); - - return c; -} - -static void fiq_tty_poll_put_char(struct tty_driver *driver, int line, char ch) -{ - struct fiq_debugger_state **states = driver->driver_state; - struct fiq_debugger_state *state = states[line]; - debug_uart_enable(state); - debug_putc(state, ch); - debug_uart_disable(state); -} -#endif - -static const struct tty_port_operations fiq_tty_port_ops; - -static const struct tty_operations fiq_tty_driver_ops = { - .write = fiq_tty_write, - .write_room = fiq_tty_write_room, - .open = fiq_tty_open, - .close = fiq_tty_close, -#ifdef CONFIG_CONSOLE_POLL - .poll_init = fiq_tty_poll_init, - .poll_get_char = fiq_tty_poll_get_char, - .poll_put_char = fiq_tty_poll_put_char, -#endif -}; - -static int fiq_debugger_tty_init(void) -{ - int ret; - struct fiq_debugger_state **states = NULL; - - states = kzalloc(sizeof(*states) * MAX_FIQ_DEBUGGER_PORTS, GFP_KERNEL); - if (!states) { - pr_err("Failed to allocate fiq debugger state structres\n"); - return -ENOMEM; - } - - fiq_tty_driver = alloc_tty_driver(MAX_FIQ_DEBUGGER_PORTS); - if (!fiq_tty_driver) { - pr_err("Failed to allocate fiq debugger tty\n"); - ret = -ENOMEM; - goto err_free_state; - } - - fiq_tty_driver->owner = THIS_MODULE; - fiq_tty_driver->driver_name = "fiq-debugger"; - fiq_tty_driver->name = "ttyFIQ"; - fiq_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; - fiq_tty_driver->subtype = SERIAL_TYPE_NORMAL; - fiq_tty_driver->init_termios = tty_std_termios; - fiq_tty_driver->flags = TTY_DRIVER_REAL_RAW | - TTY_DRIVER_DYNAMIC_DEV; - fiq_tty_driver->driver_state = states; - - fiq_tty_driver->init_termios.c_cflag = - B115200 | CS8 | CREAD | HUPCL | CLOCAL; - fiq_tty_driver->init_termios.c_ispeed = 115200; - fiq_tty_driver->init_termios.c_ospeed = 115200; - - tty_set_operations(fiq_tty_driver, &fiq_tty_driver_ops); - - ret = tty_register_driver(fiq_tty_driver); - if (ret) { - pr_err("Failed to register fiq tty: %d\n", ret); - goto err_free_tty; - } - - pr_info("Registered FIQ tty driver\n"); - return 0; - -err_free_tty: - put_tty_driver(fiq_tty_driver); - fiq_tty_driver = NULL; -err_free_state: - kfree(states); - return ret; -} - -static int fiq_debugger_tty_init_one(struct fiq_debugger_state *state) -{ - int ret; - struct device *tty_dev; - struct fiq_debugger_state **states = fiq_tty_driver->driver_state; - - states[state->pdev->id] = state; - - state->tty_rbuf = fiq_debugger_ringbuf_alloc(1024); - if (!state->tty_rbuf) { - pr_err("Failed to allocate fiq debugger ringbuf\n"); - ret = -ENOMEM; - goto err; - } - - tty_port_init(&state->tty_port); - state->tty_port.ops = &fiq_tty_port_ops; - - tty_dev = tty_port_register_device(&state->tty_port, fiq_tty_driver, - state->pdev->id, &state->pdev->dev); - if (IS_ERR(tty_dev)) { - pr_err("Failed to register fiq debugger tty device\n"); - ret = PTR_ERR(tty_dev); - goto err; - } - - device_set_wakeup_capable(tty_dev, 1); - - pr_info("Registered fiq debugger ttyFIQ%d\n", state->pdev->id); - - return 0; - -err: - fiq_debugger_ringbuf_free(state->tty_rbuf); - state->tty_rbuf = NULL; - return ret; -} -#endif - -static int fiq_debugger_dev_suspend(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct fiq_debugger_state *state = platform_get_drvdata(pdev); - - if (state->pdata->uart_dev_suspend) - return state->pdata->uart_dev_suspend(pdev); - return 0; -} - -static int fiq_debugger_dev_resume(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct fiq_debugger_state *state = platform_get_drvdata(pdev); - - if (state->pdata->uart_dev_resume) - return state->pdata->uart_dev_resume(pdev); - return 0; -} - -static int fiq_debugger_probe(struct platform_device *pdev) -{ - int ret; - struct fiq_debugger_pdata *pdata = dev_get_platdata(&pdev->dev); - struct fiq_debugger_state *state; - int fiq; - int uart_irq; - - if (pdev->id >= MAX_FIQ_DEBUGGER_PORTS) - return -EINVAL; - - if (!pdata->uart_getc || !pdata->uart_putc) - return -EINVAL; - if ((pdata->uart_enable && !pdata->uart_disable) || - (!pdata->uart_enable && pdata->uart_disable)) - return -EINVAL; - - fiq = platform_get_irq_byname(pdev, "fiq"); - uart_irq = platform_get_irq_byname(pdev, "uart_irq"); - - /* uart_irq mode and fiq mode are mutually exclusive, but one of them - * is required */ - if ((uart_irq < 0 && fiq < 0) || (uart_irq >= 0 && fiq >= 0)) - return -EINVAL; - if (fiq >= 0 && !pdata->fiq_enable) - return -EINVAL; - - state = kzalloc(sizeof(*state), GFP_KERNEL); - setup_timer(&state->sleep_timer, sleep_timer_expired, - (unsigned long)state); - state->pdata = pdata; - state->pdev = pdev; - state->no_sleep = initial_no_sleep; - state->debug_enable = initial_debug_enable; - state->console_enable = initial_console_enable; - - state->fiq = fiq; - state->uart_irq = uart_irq; - state->signal_irq = platform_get_irq_byname(pdev, "signal"); - state->wakeup_irq = platform_get_irq_byname(pdev, "wakeup"); - - INIT_WORK(&state->work, debug_work); - spin_lock_init(&state->work_lock); - - platform_set_drvdata(pdev, state); - - spin_lock_init(&state->sleep_timer_lock); - - if (state->wakeup_irq < 0 && debug_have_fiq(state)) - state->no_sleep = true; - state->ignore_next_wakeup_irq = !state->no_sleep; - - wake_lock_init(&state->debugger_wake_lock, - WAKE_LOCK_SUSPEND, "serial-debug"); - - state->clk = clk_get(&pdev->dev, NULL); - if (IS_ERR(state->clk)) - state->clk = NULL; - - /* do not call pdata->uart_enable here since uart_init may still - * need to do some initialization before uart_enable can work. - * So, only try to manage the clock during init. - */ - if (state->clk) - clk_enable(state->clk); - - if (pdata->uart_init) { - ret = pdata->uart_init(pdev); - if (ret) - goto err_uart_init; - } - - debug_printf_nfiq(state, "\n", - state->no_sleep ? "" : "twice "); - - if (debug_have_fiq(state)) { - state->handler.fiq = debug_fiq; - state->handler.resume = debug_resume; - ret = fiq_glue_register_handler(&state->handler); - if (ret) { - pr_err("%s: could not install fiq handler\n", __func__); - goto err_register_fiq; - } - - pdata->fiq_enable(pdev, state->fiq, 1); - } else { - ret = request_irq(state->uart_irq, debug_uart_irq, - IRQF_NO_SUSPEND, "debug", state); - if (ret) { - pr_err("%s: could not install irq handler\n", __func__); - goto err_register_irq; - } - - /* for irq-only mode, we want this irq to wake us up, if it - * can. - */ - enable_irq_wake(state->uart_irq); - } - - if (state->clk) - clk_disable(state->clk); - - if (state->signal_irq >= 0) { - ret = request_irq(state->signal_irq, debug_signal_irq, - IRQF_TRIGGER_RISING, "debug-signal", state); - if (ret) - pr_err("serial_debugger: could not install signal_irq"); - } - - if (state->wakeup_irq >= 0) { - ret = request_irq(state->wakeup_irq, wakeup_irq_handler, - IRQF_TRIGGER_FALLING | IRQF_DISABLED, - "debug-wakeup", state); - if (ret) { - pr_err("serial_debugger: " - "could not install wakeup irq\n"); - state->wakeup_irq = -1; - } else { - ret = enable_irq_wake(state->wakeup_irq); - if (ret) { - pr_err("serial_debugger: " - "could not enable wakeup\n"); - state->wakeup_irq_no_set_wake = true; - } - } - } - if (state->no_sleep) - handle_wakeup(state); - -#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE) - spin_lock_init(&state->console_lock); - state->console = fiq_debugger_console; - state->console.index = pdev->id; - if (!console_set_on_cmdline) - add_preferred_console(state->console.name, - state->console.index, NULL); - register_console(&state->console); - fiq_debugger_tty_init_one(state); -#endif - return 0; - -err_register_irq: -err_register_fiq: - if (pdata->uart_free) - pdata->uart_free(pdev); -err_uart_init: - if (state->clk) - clk_disable(state->clk); - if (state->clk) - clk_put(state->clk); - wake_lock_destroy(&state->debugger_wake_lock); - platform_set_drvdata(pdev, NULL); - kfree(state); - return ret; -} - -static const struct dev_pm_ops fiq_debugger_dev_pm_ops = { - .suspend = fiq_debugger_dev_suspend, - .resume = fiq_debugger_dev_resume, -}; - -static struct platform_driver fiq_debugger_driver = { - .probe = fiq_debugger_probe, - .driver = { - .name = "fiq_debugger", - .pm = &fiq_debugger_dev_pm_ops, - }, -}; - -static int __init fiq_debugger_init(void) -{ -#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE) - fiq_debugger_tty_init(); -#endif - return platform_driver_register(&fiq_debugger_driver); -} - -postcore_initcall(fiq_debugger_init); diff --git a/arch/arm/common/fiq_debugger_ringbuf.h b/arch/arm/common/fiq_debugger_ringbuf.h deleted file mode 100644 index 2649b5581088..000000000000 --- a/arch/arm/common/fiq_debugger_ringbuf.h +++ /dev/null @@ -1,94 +0,0 @@ -/* - * arch/arm/common/fiq_debugger_ringbuf.c - * - * simple lockless ringbuffer - * - * Copyright (C) 2010 Google, Inc. - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * 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. - */ - -#include -#include - -struct fiq_debugger_ringbuf { - int len; - int head; - int tail; - u8 buf[]; -}; - - -static inline struct fiq_debugger_ringbuf *fiq_debugger_ringbuf_alloc(int len) -{ - struct fiq_debugger_ringbuf *rbuf; - - rbuf = kzalloc(sizeof(*rbuf) + len, GFP_KERNEL); - if (rbuf == NULL) - return NULL; - - rbuf->len = len; - rbuf->head = 0; - rbuf->tail = 0; - smp_mb(); - - return rbuf; -} - -static inline void fiq_debugger_ringbuf_free(struct fiq_debugger_ringbuf *rbuf) -{ - kfree(rbuf); -} - -static inline int fiq_debugger_ringbuf_level(struct fiq_debugger_ringbuf *rbuf) -{ - int level = rbuf->head - rbuf->tail; - - if (level < 0) - level = rbuf->len + level; - - return level; -} - -static inline int fiq_debugger_ringbuf_room(struct fiq_debugger_ringbuf *rbuf) -{ - return rbuf->len - fiq_debugger_ringbuf_level(rbuf) - 1; -} - -static inline u8 -fiq_debugger_ringbuf_peek(struct fiq_debugger_ringbuf *rbuf, int i) -{ - return rbuf->buf[(rbuf->tail + i) % rbuf->len]; -} - -static inline int -fiq_debugger_ringbuf_consume(struct fiq_debugger_ringbuf *rbuf, int count) -{ - count = min(count, fiq_debugger_ringbuf_level(rbuf)); - - rbuf->tail = (rbuf->tail + count) % rbuf->len; - smp_mb(); - - return count; -} - -static inline int -fiq_debugger_ringbuf_push(struct fiq_debugger_ringbuf *rbuf, u8 datum) -{ - if (fiq_debugger_ringbuf_room(rbuf) == 0) - return 0; - - rbuf->buf[rbuf->head] = datum; - smp_mb(); - rbuf->head = (rbuf->head + 1) % rbuf->len; - smp_mb(); - - return 1; -} diff --git a/arch/arm/include/asm/fiq_debugger.h b/arch/arm/include/asm/fiq_debugger.h deleted file mode 100644 index 4d274883ba6a..000000000000 --- a/arch/arm/include/asm/fiq_debugger.h +++ /dev/null @@ -1,64 +0,0 @@ -/* - * arch/arm/include/asm/fiq_debugger.h - * - * Copyright (C) 2010 Google, Inc. - * Author: Colin Cross - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * 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. - * - */ - -#ifndef _ARCH_ARM_MACH_TEGRA_FIQ_DEBUGGER_H_ -#define _ARCH_ARM_MACH_TEGRA_FIQ_DEBUGGER_H_ - -#include - -#define FIQ_DEBUGGER_NO_CHAR NO_POLL_CHAR -#define FIQ_DEBUGGER_BREAK 0x00ff0100 - -#define FIQ_DEBUGGER_FIQ_IRQ_NAME "fiq" -#define FIQ_DEBUGGER_SIGNAL_IRQ_NAME "signal" -#define FIQ_DEBUGGER_WAKEUP_IRQ_NAME "wakeup" - -/** - * struct fiq_debugger_pdata - fiq debugger platform data - * @uart_resume: used to restore uart state right before enabling - * the fiq. - * @uart_enable: Do the work necessary to communicate with the uart - * hw (enable clocks, etc.). This must be ref-counted. - * @uart_disable: Do the work necessary to disable the uart hw - * (disable clocks, etc.). This must be ref-counted. - * @uart_dev_suspend: called during PM suspend, generally not needed - * for real fiq mode debugger. - * @uart_dev_resume: called during PM resume, generally not needed - * for real fiq mode debugger. - */ -struct fiq_debugger_pdata { - int (*uart_init)(struct platform_device *pdev); - void (*uart_free)(struct platform_device *pdev); - int (*uart_resume)(struct platform_device *pdev); - int (*uart_getc)(struct platform_device *pdev); - void (*uart_putc)(struct platform_device *pdev, unsigned int c); - void (*uart_flush)(struct platform_device *pdev); - void (*uart_enable)(struct platform_device *pdev); - void (*uart_disable)(struct platform_device *pdev); - - int (*uart_dev_suspend)(struct platform_device *pdev); - int (*uart_dev_resume)(struct platform_device *pdev); - - void (*fiq_enable)(struct platform_device *pdev, unsigned int fiq, - bool enable); - void (*fiq_ack)(struct platform_device *pdev, unsigned int fiq); - - void (*force_irq)(struct platform_device *pdev, unsigned int irq); - void (*force_irq_ack)(struct platform_device *pdev, unsigned int irq); -}; - -#endif diff --git a/drivers/staging/android/Kconfig b/drivers/staging/android/Kconfig index 71a50b99caff..0a28c7616d53 100644 --- a/drivers/staging/android/Kconfig +++ b/drivers/staging/android/Kconfig @@ -16,6 +16,8 @@ config ASHMEM source "drivers/staging/android/ion/Kconfig" +source "drivers/staging/android/fiq_debugger/Kconfig" + endif # if ANDROID endmenu diff --git a/drivers/staging/android/Makefile b/drivers/staging/android/Makefile index 7cf1564a49a5..9b9b297d7c0e 100644 --- a/drivers/staging/android/Makefile +++ b/drivers/staging/android/Makefile @@ -1,5 +1,6 @@ ccflags-y += -I$(src) # needed for trace events obj-y += ion/ +obj-$(CONFIG_FIQ_DEBUGGER) += fiq_debugger/ obj-$(CONFIG_ASHMEM) += ashmem.o diff --git a/drivers/staging/android/fiq_debugger/Kconfig b/drivers/staging/android/fiq_debugger/Kconfig new file mode 100644 index 000000000000..803fb59cc82f --- /dev/null +++ b/drivers/staging/android/fiq_debugger/Kconfig @@ -0,0 +1,43 @@ +config FIQ_DEBUGGER + bool "FIQ Mode Serial Debugger" + default n + depends on ARM + help + The FIQ serial debugger can accept commands even when the + kernel is unresponsive due to being stuck with interrupts + disabled. + +config FIQ_DEBUGGER_NO_SLEEP + bool "Keep serial debugger active" + depends on FIQ_DEBUGGER + default n + help + Enables the serial debugger at boot. Passing + fiq_debugger.no_sleep on the kernel commandline will + override this config option. + +config FIQ_DEBUGGER_WAKEUP_IRQ_ALWAYS_ON + bool "Don't disable wakeup IRQ when debugger is active" + depends on FIQ_DEBUGGER + default n + help + Don't disable the wakeup irq when enabling the uart clock. This will + cause extra interrupts, but it makes the serial debugger usable with + on some MSM radio builds that ignore the uart clock request in power + collapse. + +config FIQ_DEBUGGER_CONSOLE + bool "Console on FIQ Serial Debugger port" + depends on FIQ_DEBUGGER + default n + help + Enables a console so that printk messages are displayed on + the debugger serial port as the occur. + +config FIQ_DEBUGGER_CONSOLE_DEFAULT_ENABLE + bool "Put the FIQ debugger into console mode by default" + depends on FIQ_DEBUGGER_CONSOLE + default n + help + If enabled, this puts the fiq debugger into console mode by default. + Otherwise, the fiq debugger will start out in debug mode. diff --git a/drivers/staging/android/fiq_debugger/Makefile b/drivers/staging/android/fiq_debugger/Makefile new file mode 100644 index 000000000000..437037852963 --- /dev/null +++ b/drivers/staging/android/fiq_debugger/Makefile @@ -0,0 +1 @@ +obj-y += fiq_debugger.o diff --git a/drivers/staging/android/fiq_debugger/fiq_debugger.c b/drivers/staging/android/fiq_debugger/fiq_debugger.c new file mode 100644 index 000000000000..ead38968bca7 --- /dev/null +++ b/drivers/staging/android/fiq_debugger/fiq_debugger.c @@ -0,0 +1,1376 @@ +/* + * drivers/staging/android/fiq_debugger.c + * + * Serial Debugger Interface accessed through an FIQ interrupt. + * + * Copyright (C) 2008 Google, Inc. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include + +#include "fiq_debugger.h" +#include "fiq_debugger_ringbuf.h" + +#define DEBUG_MAX 64 +#define MAX_UNHANDLED_FIQ_COUNT 1000000 + +#define MAX_FIQ_DEBUGGER_PORTS 4 + +#define THREAD_INFO(sp) ((struct thread_info *) \ + ((unsigned long)(sp) & ~(THREAD_SIZE - 1))) + +struct fiq_debugger_state { + struct fiq_glue_handler handler; + + int fiq; + int uart_irq; + int signal_irq; + int wakeup_irq; + bool wakeup_irq_no_set_wake; + struct clk *clk; + struct fiq_debugger_pdata *pdata; + struct platform_device *pdev; + + char debug_cmd[DEBUG_MAX]; + int debug_busy; + int debug_abort; + + char debug_buf[DEBUG_MAX]; + int debug_count; + + bool no_sleep; + bool debug_enable; + bool ignore_next_wakeup_irq; + struct timer_list sleep_timer; + spinlock_t sleep_timer_lock; + bool uart_enabled; + struct wake_lock debugger_wake_lock; + bool console_enable; + int current_cpu; + atomic_t unhandled_fiq_count; + bool in_fiq; + + struct work_struct work; + spinlock_t work_lock; + char work_cmd[DEBUG_MAX]; + +#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE + spinlock_t console_lock; + struct console console; + struct tty_port tty_port; + struct fiq_debugger_ringbuf *tty_rbuf; + bool syslog_dumping; +#endif + + unsigned int last_irqs[NR_IRQS]; + unsigned int last_local_timer_irqs[NR_CPUS]; +}; + +#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE +struct tty_driver *fiq_tty_driver; +#endif + +#ifdef CONFIG_FIQ_DEBUGGER_NO_SLEEP +static bool initial_no_sleep = true; +#else +static bool initial_no_sleep; +#endif + +#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE_DEFAULT_ENABLE +static bool initial_debug_enable = true; +static bool initial_console_enable = true; +#else +static bool initial_debug_enable; +static bool initial_console_enable; +#endif + +static bool fiq_kgdb_enable; + +module_param_named(no_sleep, initial_no_sleep, bool, 0644); +module_param_named(debug_enable, initial_debug_enable, bool, 0644); +module_param_named(console_enable, initial_console_enable, bool, 0644); +module_param_named(kgdb_enable, fiq_kgdb_enable, bool, 0644); + +#ifdef CONFIG_FIQ_DEBUGGER_WAKEUP_IRQ_ALWAYS_ON +static inline void enable_wakeup_irq(struct fiq_debugger_state *state) {} +static inline void disable_wakeup_irq(struct fiq_debugger_state *state) {} +#else +static inline void enable_wakeup_irq(struct fiq_debugger_state *state) +{ + if (state->wakeup_irq < 0) + return; + enable_irq(state->wakeup_irq); + if (!state->wakeup_irq_no_set_wake) + enable_irq_wake(state->wakeup_irq); +} +static inline void disable_wakeup_irq(struct fiq_debugger_state *state) +{ + if (state->wakeup_irq < 0) + return; + disable_irq_nosync(state->wakeup_irq); + if (!state->wakeup_irq_no_set_wake) + disable_irq_wake(state->wakeup_irq); +} +#endif + +static bool inline debug_have_fiq(struct fiq_debugger_state *state) +{ + return (state->fiq >= 0); +} + +static void debug_force_irq(struct fiq_debugger_state *state) +{ + unsigned int irq = state->signal_irq; + + if (WARN_ON(!debug_have_fiq(state))) + return; + if (state->pdata->force_irq) { + state->pdata->force_irq(state->pdev, irq); + } else { + struct irq_chip *chip = irq_get_chip(irq); + if (chip && chip->irq_retrigger) + chip->irq_retrigger(irq_get_irq_data(irq)); + } +} + +static void debug_uart_enable(struct fiq_debugger_state *state) +{ + if (state->clk) + clk_enable(state->clk); + if (state->pdata->uart_enable) + state->pdata->uart_enable(state->pdev); +} + +static void debug_uart_disable(struct fiq_debugger_state *state) +{ + if (state->pdata->uart_disable) + state->pdata->uart_disable(state->pdev); + if (state->clk) + clk_disable(state->clk); +} + +static void debug_uart_flush(struct fiq_debugger_state *state) +{ + if (state->pdata->uart_flush) + state->pdata->uart_flush(state->pdev); +} + +static void debug_putc(struct fiq_debugger_state *state, char c) +{ + state->pdata->uart_putc(state->pdev, c); +} + +static void debug_puts(struct fiq_debugger_state *state, char *s) +{ + unsigned c; + while ((c = *s++)) { + if (c == '\n') + debug_putc(state, '\r'); + debug_putc(state, c); + } +} + +static void debug_prompt(struct fiq_debugger_state *state) +{ + debug_puts(state, "debug> "); +} + +static void dump_kernel_log(struct fiq_debugger_state *state) +{ + char buf[512]; + size_t len; + struct kmsg_dumper dumper = { .active = true }; + + + kmsg_dump_rewind_nolock(&dumper); + while (kmsg_dump_get_line_nolock(&dumper, true, buf, + sizeof(buf) - 1, &len)) { + buf[len] = 0; + debug_puts(state, buf); + } +} + +static char *mode_name(unsigned cpsr) +{ + switch (cpsr & MODE_MASK) { + case USR_MODE: return "USR"; + case FIQ_MODE: return "FIQ"; + case IRQ_MODE: return "IRQ"; + case SVC_MODE: return "SVC"; + case ABT_MODE: return "ABT"; + case UND_MODE: return "UND"; + case SYSTEM_MODE: return "SYS"; + default: return "???"; + } +} + +static int debug_printf(void *cookie, const char *fmt, ...) +{ + struct fiq_debugger_state *state = cookie; + char buf[256]; + va_list ap; + + va_start(ap, fmt); + vsnprintf(buf, sizeof(buf), fmt, ap); + va_end(ap); + + debug_puts(state, buf); + return state->debug_abort; +} + +/* Safe outside fiq context */ +static int debug_printf_nfiq(void *cookie, const char *fmt, ...) +{ + struct fiq_debugger_state *state = cookie; + char buf[256]; + va_list ap; + unsigned long irq_flags; + + va_start(ap, fmt); + vsnprintf(buf, 128, fmt, ap); + va_end(ap); + + local_irq_save(irq_flags); + debug_puts(state, buf); + debug_uart_flush(state); + local_irq_restore(irq_flags); + return state->debug_abort; +} + +static void dump_regs(struct fiq_debugger_state *state, unsigned *regs) +{ + debug_printf(state, " r0 %08x r1 %08x r2 %08x r3 %08x\n", + regs[0], regs[1], regs[2], regs[3]); + debug_printf(state, " r4 %08x r5 %08x r6 %08x r7 %08x\n", + regs[4], regs[5], regs[6], regs[7]); + debug_printf(state, " r8 %08x r9 %08x r10 %08x r11 %08x mode %s\n", + regs[8], regs[9], regs[10], regs[11], + mode_name(regs[16])); + if ((regs[16] & MODE_MASK) == USR_MODE) + debug_printf(state, " ip %08x sp %08x lr %08x pc %08x " + "cpsr %08x\n", regs[12], regs[13], regs[14], + regs[15], regs[16]); + else + debug_printf(state, " ip %08x sp %08x lr %08x pc %08x " + "cpsr %08x spsr %08x\n", regs[12], regs[13], + regs[14], regs[15], regs[16], regs[17]); +} + +struct mode_regs { + unsigned long sp_svc; + unsigned long lr_svc; + unsigned long spsr_svc; + + unsigned long sp_abt; + unsigned long lr_abt; + unsigned long spsr_abt; + + unsigned long sp_und; + unsigned long lr_und; + unsigned long spsr_und; + + unsigned long sp_irq; + unsigned long lr_irq; + unsigned long spsr_irq; + + unsigned long r8_fiq; + unsigned long r9_fiq; + unsigned long r10_fiq; + unsigned long r11_fiq; + unsigned long r12_fiq; + unsigned long sp_fiq; + unsigned long lr_fiq; + unsigned long spsr_fiq; +}; + +void __naked get_mode_regs(struct mode_regs *regs) +{ + asm volatile ( + "mrs r1, cpsr\n" + "msr cpsr_c, #0xd3 @(SVC_MODE | PSR_I_BIT | PSR_F_BIT)\n" + "stmia r0!, {r13 - r14}\n" + "mrs r2, spsr\n" + "msr cpsr_c, #0xd7 @(ABT_MODE | PSR_I_BIT | PSR_F_BIT)\n" + "stmia r0!, {r2, r13 - r14}\n" + "mrs r2, spsr\n" + "msr cpsr_c, #0xdb @(UND_MODE | PSR_I_BIT | PSR_F_BIT)\n" + "stmia r0!, {r2, r13 - r14}\n" + "mrs r2, spsr\n" + "msr cpsr_c, #0xd2 @(IRQ_MODE | PSR_I_BIT | PSR_F_BIT)\n" + "stmia r0!, {r2, r13 - r14}\n" + "mrs r2, spsr\n" + "msr cpsr_c, #0xd1 @(FIQ_MODE | PSR_I_BIT | PSR_F_BIT)\n" + "stmia r0!, {r2, r8 - r14}\n" + "mrs r2, spsr\n" + "stmia r0!, {r2}\n" + "msr cpsr_c, r1\n" + "bx lr\n"); +} + + +static void dump_allregs(struct fiq_debugger_state *state, unsigned *regs) +{ + struct mode_regs mode_regs; + dump_regs(state, regs); + get_mode_regs(&mode_regs); + debug_printf(state, " svc: sp %08x lr %08x spsr %08x\n", + mode_regs.sp_svc, mode_regs.lr_svc, mode_regs.spsr_svc); + debug_printf(state, " abt: sp %08x lr %08x spsr %08x\n", + mode_regs.sp_abt, mode_regs.lr_abt, mode_regs.spsr_abt); + debug_printf(state, " und: sp %08x lr %08x spsr %08x\n", + mode_regs.sp_und, mode_regs.lr_und, mode_regs.spsr_und); + debug_printf(state, " irq: sp %08x lr %08x spsr %08x\n", + mode_regs.sp_irq, mode_regs.lr_irq, mode_regs.spsr_irq); + debug_printf(state, " fiq: r8 %08x r9 %08x r10 %08x r11 %08x " + "r12 %08x\n", + mode_regs.r8_fiq, mode_regs.r9_fiq, mode_regs.r10_fiq, + mode_regs.r11_fiq, mode_regs.r12_fiq); + debug_printf(state, " fiq: sp %08x lr %08x spsr %08x\n", + mode_regs.sp_fiq, mode_regs.lr_fiq, mode_regs.spsr_fiq); +} + +static void dump_irqs(struct fiq_debugger_state *state) +{ + int n; + struct irq_desc *desc; + + debug_printf(state, "irqnr total since-last status name\n"); + for_each_irq_desc(n, desc) { + struct irqaction *act = desc->action; + if (!act && !kstat_irqs(n)) + continue; + debug_printf(state, "%5d: %10u %11u %8x %s\n", n, + kstat_irqs(n), + kstat_irqs(n) - state->last_irqs[n], + desc->status_use_accessors, + (act && act->name) ? act->name : "???"); + state->last_irqs[n] = kstat_irqs(n); + } +} + +struct stacktrace_state { + struct fiq_debugger_state *state; + unsigned int depth; +}; + +static int report_trace(struct stackframe *frame, void *d) +{ + struct stacktrace_state *sts = d; + + if (sts->depth) { + debug_printf(sts->state, + " pc: %p (%pF), lr %p (%pF), sp %p, fp %p\n", + frame->pc, frame->pc, frame->lr, frame->lr, + frame->sp, frame->fp); + sts->depth--; + return 0; + } + debug_printf(sts->state, " ...\n"); + + return sts->depth == 0; +} + +struct frame_tail { + struct frame_tail *fp; + unsigned long sp; + unsigned long lr; +} __attribute__((packed)); + +static struct frame_tail *user_backtrace(struct fiq_debugger_state *state, + struct frame_tail *tail) +{ + struct frame_tail buftail[2]; + + /* Also check accessibility of one struct frame_tail beyond */ + if (!access_ok(VERIFY_READ, tail, sizeof(buftail))) { + debug_printf(state, " invalid frame pointer %p\n", tail); + return NULL; + } + if (__copy_from_user_inatomic(buftail, tail, sizeof(buftail))) { + debug_printf(state, + " failed to copy frame pointer %p\n", tail); + return NULL; + } + + debug_printf(state, " %p\n", buftail[0].lr); + + /* frame pointers should strictly progress back up the stack + * (towards higher addresses) */ + if (tail >= buftail[0].fp) + return NULL; + + return buftail[0].fp-1; +} + +void dump_stacktrace(struct fiq_debugger_state *state, + struct pt_regs * const regs, unsigned int depth, void *ssp) +{ + struct frame_tail *tail; + struct thread_info *real_thread_info = THREAD_INFO(ssp); + struct stacktrace_state sts; + + sts.depth = depth; + sts.state = state; + *current_thread_info() = *real_thread_info; + + if (!current) + debug_printf(state, "current NULL\n"); + else + debug_printf(state, "pid: %d comm: %s\n", + current->pid, current->comm); + dump_regs(state, (unsigned *)regs); + + if (!user_mode(regs)) { + struct stackframe frame; + frame.fp = regs->ARM_fp; + frame.sp = regs->ARM_sp; + frame.lr = regs->ARM_lr; + frame.pc = regs->ARM_pc; + debug_printf(state, + " pc: %p (%pF), lr %p (%pF), sp %p, fp %p\n", + regs->ARM_pc, regs->ARM_pc, regs->ARM_lr, regs->ARM_lr, + regs->ARM_sp, regs->ARM_fp); + walk_stackframe(&frame, report_trace, &sts); + return; + } + + tail = ((struct frame_tail *) regs->ARM_fp) - 1; + while (depth-- && tail && !((unsigned long) tail & 3)) + tail = user_backtrace(state, tail); +} + +static void do_ps(struct fiq_debugger_state *state) +{ + struct task_struct *g; + struct task_struct *p; + unsigned task_state; + static const char stat_nam[] = "RSDTtZX"; + + debug_printf(state, "pid ppid prio task pc\n"); + read_lock(&tasklist_lock); + do_each_thread(g, p) { + task_state = p->state ? __ffs(p->state) + 1 : 0; + debug_printf(state, + "%5d %5d %4d ", p->pid, p->parent->pid, p->prio); + debug_printf(state, "%-13.13s %c", p->comm, + task_state >= sizeof(stat_nam) ? '?' : stat_nam[task_state]); + if (task_state == TASK_RUNNING) + debug_printf(state, " running\n"); + else + debug_printf(state, " %08lx\n", thread_saved_pc(p)); + } while_each_thread(g, p); + read_unlock(&tasklist_lock); +} + +#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE +static void begin_syslog_dump(struct fiq_debugger_state *state) +{ + state->syslog_dumping = true; +} + +static void end_syslog_dump(struct fiq_debugger_state *state) +{ + state->syslog_dumping = false; +} +#else +extern int do_syslog(int type, char __user *bug, int count); +static void begin_syslog_dump(struct fiq_debugger_state *state) +{ + do_syslog(5 /* clear */, NULL, 0); +} + +static void end_syslog_dump(struct fiq_debugger_state *state) +{ + dump_kernel_log(state); +} +#endif + +static void do_sysrq(struct fiq_debugger_state *state, char rq) +{ + if ((rq == 'g' || rq == 'G') && !fiq_kgdb_enable) { + debug_printf(state, "sysrq-g blocked\n"); + return; + } + begin_syslog_dump(state); + handle_sysrq(rq); + end_syslog_dump(state); +} + +#ifdef CONFIG_KGDB +static void do_kgdb(struct fiq_debugger_state *state) +{ + if (!fiq_kgdb_enable) { + debug_printf(state, "kgdb through fiq debugger not enabled\n"); + return; + } + + debug_printf(state, "enabling console and triggering kgdb\n"); + state->console_enable = true; + handle_sysrq('g'); +} +#endif + +static void debug_schedule_work(struct fiq_debugger_state *state, char *cmd) +{ + unsigned long flags; + + spin_lock_irqsave(&state->work_lock, flags); + if (state->work_cmd[0] != '\0') { + debug_printf(state, "work command processor busy\n"); + spin_unlock_irqrestore(&state->work_lock, flags); + return; + } + + strlcpy(state->work_cmd, cmd, sizeof(state->work_cmd)); + spin_unlock_irqrestore(&state->work_lock, flags); + + schedule_work(&state->work); +} + +static void debug_work(struct work_struct *work) +{ + struct fiq_debugger_state *state; + char work_cmd[DEBUG_MAX]; + char *cmd; + unsigned long flags; + + state = container_of(work, struct fiq_debugger_state, work); + + spin_lock_irqsave(&state->work_lock, flags); + + strlcpy(work_cmd, state->work_cmd, sizeof(work_cmd)); + state->work_cmd[0] = '\0'; + + spin_unlock_irqrestore(&state->work_lock, flags); + + cmd = work_cmd; + if (!strncmp(cmd, "reboot", 6)) { + cmd += 6; + while (*cmd == ' ') + cmd++; + if (*cmd != '\0') + kernel_restart(cmd); + else + kernel_restart(NULL); + } else { + debug_printf(state, "unknown work command '%s'\n", work_cmd); + } +} + +/* This function CANNOT be called in FIQ context */ +static void debug_irq_exec(struct fiq_debugger_state *state, char *cmd) +{ + if (!strcmp(cmd, "ps")) + do_ps(state); + if (!strcmp(cmd, "sysrq")) + do_sysrq(state, 'h'); + if (!strncmp(cmd, "sysrq ", 6)) + do_sysrq(state, cmd[6]); +#ifdef CONFIG_KGDB + if (!strcmp(cmd, "kgdb")) + do_kgdb(state); +#endif + if (!strncmp(cmd, "reboot", 6)) + debug_schedule_work(state, cmd); +} + +static void debug_help(struct fiq_debugger_state *state) +{ + debug_printf(state, "FIQ Debugger commands:\n" + " pc PC status\n" + " regs Register dump\n" + " allregs Extended Register dump\n" + " bt Stack trace\n" + " reboot [] Reboot with command \n" + " reset [] Hard reset with command \n" + " irqs Interupt status\n" + " kmsg Kernel log\n" + " version Kernel version\n"); + debug_printf(state, " sleep Allow sleep while in FIQ\n" + " nosleep Disable sleep while in FIQ\n" + " console Switch terminal to console\n" + " cpu Current CPU\n" + " cpu Switch to CPU\n"); + debug_printf(state, " ps Process list\n" + " sysrq sysrq options\n" + " sysrq Execute sysrq with \n"); +#ifdef CONFIG_KGDB + debug_printf(state, " kgdb Enter kernel debugger\n"); +#endif +} + +static void take_affinity(void *info) +{ + struct fiq_debugger_state *state = info; + struct cpumask cpumask; + + cpumask_clear(&cpumask); + cpumask_set_cpu(get_cpu(), &cpumask); + + irq_set_affinity(state->uart_irq, &cpumask); +} + +static void switch_cpu(struct fiq_debugger_state *state, int cpu) +{ + if (!debug_have_fiq(state)) + smp_call_function_single(cpu, take_affinity, state, false); + state->current_cpu = cpu; +} + +static bool debug_fiq_exec(struct fiq_debugger_state *state, + const char *cmd, unsigned *regs, void *svc_sp) +{ + bool signal_helper = false; + + if (!strcmp(cmd, "help") || !strcmp(cmd, "?")) { + debug_help(state); + } else if (!strcmp(cmd, "pc")) { + debug_printf(state, " pc %08x cpsr %08x mode %s\n", + regs[15], regs[16], mode_name(regs[16])); + } else if (!strcmp(cmd, "regs")) { + dump_regs(state, regs); + } else if (!strcmp(cmd, "allregs")) { + dump_allregs(state, regs); + } else if (!strcmp(cmd, "bt")) { + dump_stacktrace(state, (struct pt_regs *)regs, 100, svc_sp); + } else if (!strncmp(cmd, "reset", 5)) { + cmd += 5; + while (*cmd == ' ') + cmd++; + if (*cmd) { + char tmp_cmd[32]; + strlcpy(tmp_cmd, cmd, sizeof(tmp_cmd)); + machine_restart(tmp_cmd); + } else { + machine_restart(NULL); + } + } else if (!strcmp(cmd, "irqs")) { + dump_irqs(state); + } else if (!strcmp(cmd, "kmsg")) { + dump_kernel_log(state); + } else if (!strcmp(cmd, "version")) { + debug_printf(state, "%s\n", linux_banner); + } else if (!strcmp(cmd, "sleep")) { + state->no_sleep = false; + debug_printf(state, "enabling sleep\n"); + } else if (!strcmp(cmd, "nosleep")) { + state->no_sleep = true; + debug_printf(state, "disabling sleep\n"); + } else if (!strcmp(cmd, "console")) { + debug_printf(state, "console mode\n"); + debug_uart_flush(state); + state->console_enable = true; + } else if (!strcmp(cmd, "cpu")) { + debug_printf(state, "cpu %d\n", state->current_cpu); + } else if (!strncmp(cmd, "cpu ", 4)) { + unsigned long cpu = 0; + if (strict_strtoul(cmd + 4, 10, &cpu) == 0) + switch_cpu(state, cpu); + else + debug_printf(state, "invalid cpu\n"); + debug_printf(state, "cpu %d\n", state->current_cpu); + } else { + if (state->debug_busy) { + debug_printf(state, + "command processor busy. trying to abort.\n"); + state->debug_abort = -1; + } else { + strcpy(state->debug_cmd, cmd); + state->debug_busy = 1; + } + + return true; + } + if (!state->console_enable) + debug_prompt(state); + + return signal_helper; +} + +static void sleep_timer_expired(unsigned long data) +{ + struct fiq_debugger_state *state = (struct fiq_debugger_state *)data; + unsigned long flags; + + spin_lock_irqsave(&state->sleep_timer_lock, flags); + if (state->uart_enabled && !state->no_sleep) { + if (state->debug_enable && !state->console_enable) { + state->debug_enable = false; + debug_printf_nfiq(state, "suspending fiq debugger\n"); + } + state->ignore_next_wakeup_irq = true; + debug_uart_disable(state); + state->uart_enabled = false; + enable_wakeup_irq(state); + } + wake_unlock(&state->debugger_wake_lock); + spin_unlock_irqrestore(&state->sleep_timer_lock, flags); +} + +static void handle_wakeup(struct fiq_debugger_state *state) +{ + unsigned long flags; + + spin_lock_irqsave(&state->sleep_timer_lock, flags); + if (state->wakeup_irq >= 0 && state->ignore_next_wakeup_irq) { + state->ignore_next_wakeup_irq = false; + } else if (!state->uart_enabled) { + wake_lock(&state->debugger_wake_lock); + debug_uart_enable(state); + state->uart_enabled = true; + disable_wakeup_irq(state); + mod_timer(&state->sleep_timer, jiffies + HZ / 2); + } + spin_unlock_irqrestore(&state->sleep_timer_lock, flags); +} + +static irqreturn_t wakeup_irq_handler(int irq, void *dev) +{ + struct fiq_debugger_state *state = dev; + + if (!state->no_sleep) + debug_puts(state, "WAKEUP\n"); + handle_wakeup(state); + + return IRQ_HANDLED; +} + +static void debug_handle_console_irq_context(struct fiq_debugger_state *state) +{ +#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE) + if (state->tty_port.ops) { + int i; + int count = fiq_debugger_ringbuf_level(state->tty_rbuf); + for (i = 0; i < count; i++) { + int c = fiq_debugger_ringbuf_peek(state->tty_rbuf, 0); + tty_insert_flip_char(&state->tty_port, c, TTY_NORMAL); + if (!fiq_debugger_ringbuf_consume(state->tty_rbuf, 1)) + pr_warn("fiq tty failed to consume byte\n"); + } + tty_flip_buffer_push(&state->tty_port); + } +#endif +} + +static void debug_handle_irq_context(struct fiq_debugger_state *state) +{ + if (!state->no_sleep) { + unsigned long flags; + + spin_lock_irqsave(&state->sleep_timer_lock, flags); + wake_lock(&state->debugger_wake_lock); + mod_timer(&state->sleep_timer, jiffies + HZ * 5); + spin_unlock_irqrestore(&state->sleep_timer_lock, flags); + } + debug_handle_console_irq_context(state); + if (state->debug_busy) { + debug_irq_exec(state, state->debug_cmd); + if (!state->console_enable) + debug_prompt(state); + state->debug_busy = 0; + } +} + +static int debug_getc(struct fiq_debugger_state *state) +{ + return state->pdata->uart_getc(state->pdev); +} + +static bool debug_handle_uart_interrupt(struct fiq_debugger_state *state, + int this_cpu, void *regs, void *svc_sp) +{ + int c; + static int last_c; + int count = 0; + bool signal_helper = false; + + if (this_cpu != state->current_cpu) { + if (state->in_fiq) + return false; + + if (atomic_inc_return(&state->unhandled_fiq_count) != + MAX_UNHANDLED_FIQ_COUNT) + return false; + + debug_printf(state, "fiq_debugger: cpu %d not responding, " + "reverting to cpu %d\n", state->current_cpu, + this_cpu); + + atomic_set(&state->unhandled_fiq_count, 0); + switch_cpu(state, this_cpu); + return false; + } + + state->in_fiq = true; + + while ((c = debug_getc(state)) != FIQ_DEBUGGER_NO_CHAR) { + count++; + if (!state->debug_enable) { + if ((c == 13) || (c == 10)) { + state->debug_enable = true; + state->debug_count = 0; + debug_prompt(state); + } + } else if (c == FIQ_DEBUGGER_BREAK) { + state->console_enable = false; + debug_puts(state, "fiq debugger mode\n"); + state->debug_count = 0; + debug_prompt(state); +#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE + } else if (state->console_enable && state->tty_rbuf) { + fiq_debugger_ringbuf_push(state->tty_rbuf, c); + signal_helper = true; +#endif + } else if ((c >= ' ') && (c < 127)) { + if (state->debug_count < (DEBUG_MAX - 1)) { + state->debug_buf[state->debug_count++] = c; + debug_putc(state, c); + } + } else if ((c == 8) || (c == 127)) { + if (state->debug_count > 0) { + state->debug_count--; + debug_putc(state, 8); + debug_putc(state, ' '); + debug_putc(state, 8); + } + } else if ((c == 13) || (c == 10)) { + if (c == '\r' || (c == '\n' && last_c != '\r')) { + debug_putc(state, '\r'); + debug_putc(state, '\n'); + } + if (state->debug_count) { + state->debug_buf[state->debug_count] = 0; + state->debug_count = 0; + signal_helper |= + debug_fiq_exec(state, state->debug_buf, + regs, svc_sp); + } else { + debug_prompt(state); + } + } + last_c = c; + } + if (!state->console_enable) + debug_uart_flush(state); + if (state->pdata->fiq_ack) + state->pdata->fiq_ack(state->pdev, state->fiq); + + /* poke sleep timer if necessary */ + if (state->debug_enable && !state->no_sleep) + signal_helper = true; + + atomic_set(&state->unhandled_fiq_count, 0); + state->in_fiq = false; + + return signal_helper; +} + +static void debug_fiq(struct fiq_glue_handler *h, void *regs, void *svc_sp) +{ + struct fiq_debugger_state *state = + container_of(h, struct fiq_debugger_state, handler); + unsigned int this_cpu = THREAD_INFO(svc_sp)->cpu; + bool need_irq; + + need_irq = debug_handle_uart_interrupt(state, this_cpu, regs, svc_sp); + if (need_irq) + debug_force_irq(state); +} + +/* + * When not using FIQs, we only use this single interrupt as an entry point. + * This just effectively takes over the UART interrupt and does all the work + * in this context. + */ +static irqreturn_t debug_uart_irq(int irq, void *dev) +{ + struct fiq_debugger_state *state = dev; + bool not_done; + + handle_wakeup(state); + + /* handle the debugger irq in regular context */ + not_done = debug_handle_uart_interrupt(state, smp_processor_id(), + get_irq_regs(), + current_thread_info()); + if (not_done) + debug_handle_irq_context(state); + + return IRQ_HANDLED; +} + +/* + * If FIQs are used, not everything can happen in fiq context. + * FIQ handler does what it can and then signals this interrupt to finish the + * job in irq context. + */ +static irqreturn_t debug_signal_irq(int irq, void *dev) +{ + struct fiq_debugger_state *state = dev; + + if (state->pdata->force_irq_ack) + state->pdata->force_irq_ack(state->pdev, state->signal_irq); + + debug_handle_irq_context(state); + + return IRQ_HANDLED; +} + +static void debug_resume(struct fiq_glue_handler *h) +{ + struct fiq_debugger_state *state = + container_of(h, struct fiq_debugger_state, handler); + if (state->pdata->uart_resume) + state->pdata->uart_resume(state->pdev); +} + +#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE) +struct tty_driver *debug_console_device(struct console *co, int *index) +{ + *index = co->index; + return fiq_tty_driver; +} + +static void debug_console_write(struct console *co, + const char *s, unsigned int count) +{ + struct fiq_debugger_state *state; + unsigned long flags; + + state = container_of(co, struct fiq_debugger_state, console); + + if (!state->console_enable && !state->syslog_dumping) + return; + + debug_uart_enable(state); + spin_lock_irqsave(&state->console_lock, flags); + while (count--) { + if (*s == '\n') + debug_putc(state, '\r'); + debug_putc(state, *s++); + } + debug_uart_flush(state); + spin_unlock_irqrestore(&state->console_lock, flags); + debug_uart_disable(state); +} + +static struct console fiq_debugger_console = { + .name = "ttyFIQ", + .device = debug_console_device, + .write = debug_console_write, + .flags = CON_PRINTBUFFER | CON_ANYTIME | CON_ENABLED, +}; + +int fiq_tty_open(struct tty_struct *tty, struct file *filp) +{ + int line = tty->index; + struct fiq_debugger_state **states = tty->driver->driver_state; + struct fiq_debugger_state *state = states[line]; + + return tty_port_open(&state->tty_port, tty, filp); +} + +void fiq_tty_close(struct tty_struct *tty, struct file *filp) +{ + tty_port_close(tty->port, tty, filp); +} + +int fiq_tty_write(struct tty_struct *tty, const unsigned char *buf, int count) +{ + int i; + int line = tty->index; + struct fiq_debugger_state **states = tty->driver->driver_state; + struct fiq_debugger_state *state = states[line]; + + if (!state->console_enable) + return count; + + debug_uart_enable(state); + spin_lock_irq(&state->console_lock); + for (i = 0; i < count; i++) + debug_putc(state, *buf++); + spin_unlock_irq(&state->console_lock); + debug_uart_disable(state); + + return count; +} + +int fiq_tty_write_room(struct tty_struct *tty) +{ + return 16; +} + +#ifdef CONFIG_CONSOLE_POLL +static int fiq_tty_poll_init(struct tty_driver *driver, int line, char *options) +{ + return 0; +} + +static int fiq_tty_poll_get_char(struct tty_driver *driver, int line) +{ + struct fiq_debugger_state **states = driver->driver_state; + struct fiq_debugger_state *state = states[line]; + int c = NO_POLL_CHAR; + + debug_uart_enable(state); + if (debug_have_fiq(state)) { + int count = fiq_debugger_ringbuf_level(state->tty_rbuf); + if (count > 0) { + c = fiq_debugger_ringbuf_peek(state->tty_rbuf, 0); + fiq_debugger_ringbuf_consume(state->tty_rbuf, 1); + } + } else { + c = debug_getc(state); + if (c == FIQ_DEBUGGER_NO_CHAR) + c = NO_POLL_CHAR; + } + debug_uart_disable(state); + + return c; +} + +static void fiq_tty_poll_put_char(struct tty_driver *driver, int line, char ch) +{ + struct fiq_debugger_state **states = driver->driver_state; + struct fiq_debugger_state *state = states[line]; + debug_uart_enable(state); + debug_putc(state, ch); + debug_uart_disable(state); +} +#endif + +static const struct tty_port_operations fiq_tty_port_ops; + +static const struct tty_operations fiq_tty_driver_ops = { + .write = fiq_tty_write, + .write_room = fiq_tty_write_room, + .open = fiq_tty_open, + .close = fiq_tty_close, +#ifdef CONFIG_CONSOLE_POLL + .poll_init = fiq_tty_poll_init, + .poll_get_char = fiq_tty_poll_get_char, + .poll_put_char = fiq_tty_poll_put_char, +#endif +}; + +static int fiq_debugger_tty_init(void) +{ + int ret; + struct fiq_debugger_state **states = NULL; + + states = kzalloc(sizeof(*states) * MAX_FIQ_DEBUGGER_PORTS, GFP_KERNEL); + if (!states) { + pr_err("Failed to allocate fiq debugger state structres\n"); + return -ENOMEM; + } + + fiq_tty_driver = alloc_tty_driver(MAX_FIQ_DEBUGGER_PORTS); + if (!fiq_tty_driver) { + pr_err("Failed to allocate fiq debugger tty\n"); + ret = -ENOMEM; + goto err_free_state; + } + + fiq_tty_driver->owner = THIS_MODULE; + fiq_tty_driver->driver_name = "fiq-debugger"; + fiq_tty_driver->name = "ttyFIQ"; + fiq_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; + fiq_tty_driver->subtype = SERIAL_TYPE_NORMAL; + fiq_tty_driver->init_termios = tty_std_termios; + fiq_tty_driver->flags = TTY_DRIVER_REAL_RAW | + TTY_DRIVER_DYNAMIC_DEV; + fiq_tty_driver->driver_state = states; + + fiq_tty_driver->init_termios.c_cflag = + B115200 | CS8 | CREAD | HUPCL | CLOCAL; + fiq_tty_driver->init_termios.c_ispeed = 115200; + fiq_tty_driver->init_termios.c_ospeed = 115200; + + tty_set_operations(fiq_tty_driver, &fiq_tty_driver_ops); + + ret = tty_register_driver(fiq_tty_driver); + if (ret) { + pr_err("Failed to register fiq tty: %d\n", ret); + goto err_free_tty; + } + + pr_info("Registered FIQ tty driver\n"); + return 0; + +err_free_tty: + put_tty_driver(fiq_tty_driver); + fiq_tty_driver = NULL; +err_free_state: + kfree(states); + return ret; +} + +static int fiq_debugger_tty_init_one(struct fiq_debugger_state *state) +{ + int ret; + struct device *tty_dev; + struct fiq_debugger_state **states = fiq_tty_driver->driver_state; + + states[state->pdev->id] = state; + + state->tty_rbuf = fiq_debugger_ringbuf_alloc(1024); + if (!state->tty_rbuf) { + pr_err("Failed to allocate fiq debugger ringbuf\n"); + ret = -ENOMEM; + goto err; + } + + tty_port_init(&state->tty_port); + state->tty_port.ops = &fiq_tty_port_ops; + + tty_dev = tty_port_register_device(&state->tty_port, fiq_tty_driver, + state->pdev->id, &state->pdev->dev); + if (IS_ERR(tty_dev)) { + pr_err("Failed to register fiq debugger tty device\n"); + ret = PTR_ERR(tty_dev); + goto err; + } + + device_set_wakeup_capable(tty_dev, 1); + + pr_info("Registered fiq debugger ttyFIQ%d\n", state->pdev->id); + + return 0; + +err: + fiq_debugger_ringbuf_free(state->tty_rbuf); + state->tty_rbuf = NULL; + return ret; +} +#endif + +static int fiq_debugger_dev_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct fiq_debugger_state *state = platform_get_drvdata(pdev); + + if (state->pdata->uart_dev_suspend) + return state->pdata->uart_dev_suspend(pdev); + return 0; +} + +static int fiq_debugger_dev_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct fiq_debugger_state *state = platform_get_drvdata(pdev); + + if (state->pdata->uart_dev_resume) + return state->pdata->uart_dev_resume(pdev); + return 0; +} + +static int fiq_debugger_probe(struct platform_device *pdev) +{ + int ret; + struct fiq_debugger_pdata *pdata = dev_get_platdata(&pdev->dev); + struct fiq_debugger_state *state; + int fiq; + int uart_irq; + + if (pdev->id >= MAX_FIQ_DEBUGGER_PORTS) + return -EINVAL; + + if (!pdata->uart_getc || !pdata->uart_putc) + return -EINVAL; + if ((pdata->uart_enable && !pdata->uart_disable) || + (!pdata->uart_enable && pdata->uart_disable)) + return -EINVAL; + + fiq = platform_get_irq_byname(pdev, "fiq"); + uart_irq = platform_get_irq_byname(pdev, "uart_irq"); + + /* uart_irq mode and fiq mode are mutually exclusive, but one of them + * is required */ + if ((uart_irq < 0 && fiq < 0) || (uart_irq >= 0 && fiq >= 0)) + return -EINVAL; + if (fiq >= 0 && !pdata->fiq_enable) + return -EINVAL; + + state = kzalloc(sizeof(*state), GFP_KERNEL); + setup_timer(&state->sleep_timer, sleep_timer_expired, + (unsigned long)state); + state->pdata = pdata; + state->pdev = pdev; + state->no_sleep = initial_no_sleep; + state->debug_enable = initial_debug_enable; + state->console_enable = initial_console_enable; + + state->fiq = fiq; + state->uart_irq = uart_irq; + state->signal_irq = platform_get_irq_byname(pdev, "signal"); + state->wakeup_irq = platform_get_irq_byname(pdev, "wakeup"); + + INIT_WORK(&state->work, debug_work); + spin_lock_init(&state->work_lock); + + platform_set_drvdata(pdev, state); + + spin_lock_init(&state->sleep_timer_lock); + + if (state->wakeup_irq < 0 && debug_have_fiq(state)) + state->no_sleep = true; + state->ignore_next_wakeup_irq = !state->no_sleep; + + wake_lock_init(&state->debugger_wake_lock, + WAKE_LOCK_SUSPEND, "serial-debug"); + + state->clk = clk_get(&pdev->dev, NULL); + if (IS_ERR(state->clk)) + state->clk = NULL; + + /* do not call pdata->uart_enable here since uart_init may still + * need to do some initialization before uart_enable can work. + * So, only try to manage the clock during init. + */ + if (state->clk) + clk_enable(state->clk); + + if (pdata->uart_init) { + ret = pdata->uart_init(pdev); + if (ret) + goto err_uart_init; + } + + debug_printf_nfiq(state, "\n", + state->no_sleep ? "" : "twice "); + + if (debug_have_fiq(state)) { + state->handler.fiq = debug_fiq; + state->handler.resume = debug_resume; + ret = fiq_glue_register_handler(&state->handler); + if (ret) { + pr_err("%s: could not install fiq handler\n", __func__); + goto err_register_fiq; + } + + pdata->fiq_enable(pdev, state->fiq, 1); + } else { + ret = request_irq(state->uart_irq, debug_uart_irq, + IRQF_NO_SUSPEND, "debug", state); + if (ret) { + pr_err("%s: could not install irq handler\n", __func__); + goto err_register_irq; + } + + /* for irq-only mode, we want this irq to wake us up, if it + * can. + */ + enable_irq_wake(state->uart_irq); + } + + if (state->clk) + clk_disable(state->clk); + + if (state->signal_irq >= 0) { + ret = request_irq(state->signal_irq, debug_signal_irq, + IRQF_TRIGGER_RISING, "debug-signal", state); + if (ret) + pr_err("serial_debugger: could not install signal_irq"); + } + + if (state->wakeup_irq >= 0) { + ret = request_irq(state->wakeup_irq, wakeup_irq_handler, + IRQF_TRIGGER_FALLING | IRQF_DISABLED, + "debug-wakeup", state); + if (ret) { + pr_err("serial_debugger: " + "could not install wakeup irq\n"); + state->wakeup_irq = -1; + } else { + ret = enable_irq_wake(state->wakeup_irq); + if (ret) { + pr_err("serial_debugger: " + "could not enable wakeup\n"); + state->wakeup_irq_no_set_wake = true; + } + } + } + if (state->no_sleep) + handle_wakeup(state); + +#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE) + spin_lock_init(&state->console_lock); + state->console = fiq_debugger_console; + state->console.index = pdev->id; + if (!console_set_on_cmdline) + add_preferred_console(state->console.name, + state->console.index, NULL); + register_console(&state->console); + fiq_debugger_tty_init_one(state); +#endif + return 0; + +err_register_irq: +err_register_fiq: + if (pdata->uart_free) + pdata->uart_free(pdev); +err_uart_init: + if (state->clk) + clk_disable(state->clk); + if (state->clk) + clk_put(state->clk); + wake_lock_destroy(&state->debugger_wake_lock); + platform_set_drvdata(pdev, NULL); + kfree(state); + return ret; +} + +static const struct dev_pm_ops fiq_debugger_dev_pm_ops = { + .suspend = fiq_debugger_dev_suspend, + .resume = fiq_debugger_dev_resume, +}; + +static struct platform_driver fiq_debugger_driver = { + .probe = fiq_debugger_probe, + .driver = { + .name = "fiq_debugger", + .pm = &fiq_debugger_dev_pm_ops, + }, +}; + +static int __init fiq_debugger_init(void) +{ +#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE) + fiq_debugger_tty_init(); +#endif + return platform_driver_register(&fiq_debugger_driver); +} + +postcore_initcall(fiq_debugger_init); diff --git a/drivers/staging/android/fiq_debugger/fiq_debugger.h b/drivers/staging/android/fiq_debugger/fiq_debugger.h new file mode 100644 index 000000000000..c9ec4f8db086 --- /dev/null +++ b/drivers/staging/android/fiq_debugger/fiq_debugger.h @@ -0,0 +1,64 @@ +/* + * drivers/staging/android/fiq_debugger/fiq_debugger.h + * + * Copyright (C) 2010 Google, Inc. + * Author: Colin Cross + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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. + * + */ + +#ifndef _ARCH_ARM_MACH_TEGRA_FIQ_DEBUGGER_H_ +#define _ARCH_ARM_MACH_TEGRA_FIQ_DEBUGGER_H_ + +#include + +#define FIQ_DEBUGGER_NO_CHAR NO_POLL_CHAR +#define FIQ_DEBUGGER_BREAK 0x00ff0100 + +#define FIQ_DEBUGGER_FIQ_IRQ_NAME "fiq" +#define FIQ_DEBUGGER_SIGNAL_IRQ_NAME "signal" +#define FIQ_DEBUGGER_WAKEUP_IRQ_NAME "wakeup" + +/** + * struct fiq_debugger_pdata - fiq debugger platform data + * @uart_resume: used to restore uart state right before enabling + * the fiq. + * @uart_enable: Do the work necessary to communicate with the uart + * hw (enable clocks, etc.). This must be ref-counted. + * @uart_disable: Do the work necessary to disable the uart hw + * (disable clocks, etc.). This must be ref-counted. + * @uart_dev_suspend: called during PM suspend, generally not needed + * for real fiq mode debugger. + * @uart_dev_resume: called during PM resume, generally not needed + * for real fiq mode debugger. + */ +struct fiq_debugger_pdata { + int (*uart_init)(struct platform_device *pdev); + void (*uart_free)(struct platform_device *pdev); + int (*uart_resume)(struct platform_device *pdev); + int (*uart_getc)(struct platform_device *pdev); + void (*uart_putc)(struct platform_device *pdev, unsigned int c); + void (*uart_flush)(struct platform_device *pdev); + void (*uart_enable)(struct platform_device *pdev); + void (*uart_disable)(struct platform_device *pdev); + + int (*uart_dev_suspend)(struct platform_device *pdev); + int (*uart_dev_resume)(struct platform_device *pdev); + + void (*fiq_enable)(struct platform_device *pdev, unsigned int fiq, + bool enable); + void (*fiq_ack)(struct platform_device *pdev, unsigned int fiq); + + void (*force_irq)(struct platform_device *pdev, unsigned int irq); + void (*force_irq_ack)(struct platform_device *pdev, unsigned int irq); +}; + +#endif diff --git a/drivers/staging/android/fiq_debugger/fiq_debugger_ringbuf.h b/drivers/staging/android/fiq_debugger/fiq_debugger_ringbuf.h new file mode 100644 index 000000000000..10c3c5d09098 --- /dev/null +++ b/drivers/staging/android/fiq_debugger/fiq_debugger_ringbuf.h @@ -0,0 +1,94 @@ +/* + * drivers/staging/android/fiq_debugger/fiq_debugger_ringbuf.h + * + * simple lockless ringbuffer + * + * Copyright (C) 2010 Google, Inc. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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. + */ + +#include +#include + +struct fiq_debugger_ringbuf { + int len; + int head; + int tail; + u8 buf[]; +}; + + +static inline struct fiq_debugger_ringbuf *fiq_debugger_ringbuf_alloc(int len) +{ + struct fiq_debugger_ringbuf *rbuf; + + rbuf = kzalloc(sizeof(*rbuf) + len, GFP_KERNEL); + if (rbuf == NULL) + return NULL; + + rbuf->len = len; + rbuf->head = 0; + rbuf->tail = 0; + smp_mb(); + + return rbuf; +} + +static inline void fiq_debugger_ringbuf_free(struct fiq_debugger_ringbuf *rbuf) +{ + kfree(rbuf); +} + +static inline int fiq_debugger_ringbuf_level(struct fiq_debugger_ringbuf *rbuf) +{ + int level = rbuf->head - rbuf->tail; + + if (level < 0) + level = rbuf->len + level; + + return level; +} + +static inline int fiq_debugger_ringbuf_room(struct fiq_debugger_ringbuf *rbuf) +{ + return rbuf->len - fiq_debugger_ringbuf_level(rbuf) - 1; +} + +static inline u8 +fiq_debugger_ringbuf_peek(struct fiq_debugger_ringbuf *rbuf, int i) +{ + return rbuf->buf[(rbuf->tail + i) % rbuf->len]; +} + +static inline int +fiq_debugger_ringbuf_consume(struct fiq_debugger_ringbuf *rbuf, int count) +{ + count = min(count, fiq_debugger_ringbuf_level(rbuf)); + + rbuf->tail = (rbuf->tail + count) % rbuf->len; + smp_mb(); + + return count; +} + +static inline int +fiq_debugger_ringbuf_push(struct fiq_debugger_ringbuf *rbuf, u8 datum) +{ + if (fiq_debugger_ringbuf_room(rbuf) == 0) + return 0; + + rbuf->buf[rbuf->head] = datum; + smp_mb(); + rbuf->head = (rbuf->head + 1) % rbuf->len; + smp_mb(); + + return 1; +}