diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/x86/mm/mmio-mod.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/x86/mm/mmio-mod.c | 480 |
1 files changed, 0 insertions, 480 deletions
diff --git a/ANDROID_3.4.5/arch/x86/mm/mmio-mod.c b/ANDROID_3.4.5/arch/x86/mm/mmio-mod.c deleted file mode 100644 index dc0b7277..00000000 --- a/ANDROID_3.4.5/arch/x86/mm/mmio-mod.c +++ /dev/null @@ -1,480 +0,0 @@ -/* - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - * - * Copyright (C) IBM Corporation, 2005 - * Jeff Muizelaar, 2006, 2007 - * Pekka Paalanen, 2008 <pq@iki.fi> - * - * Derived from the read-mod example from relay-examples by Tom Zanussi. - */ - -#define pr_fmt(fmt) "mmiotrace: " fmt - -#define DEBUG 1 - -#include <linux/module.h> -#include <linux/debugfs.h> -#include <linux/slab.h> -#include <linux/uaccess.h> -#include <linux/io.h> -#include <linux/kallsyms.h> -#include <asm/pgtable.h> -#include <linux/mmiotrace.h> -#include <asm/e820.h> /* for ISA_START_ADDRESS */ -#include <linux/atomic.h> -#include <linux/percpu.h> -#include <linux/cpu.h> - -#include "pf_in.h" - -struct trap_reason { - unsigned long addr; - unsigned long ip; - enum reason_type type; - int active_traces; -}; - -struct remap_trace { - struct list_head list; - struct kmmio_probe probe; - resource_size_t phys; - unsigned long id; -}; - -/* Accessed per-cpu. */ -static DEFINE_PER_CPU(struct trap_reason, pf_reason); -static DEFINE_PER_CPU(struct mmiotrace_rw, cpu_trace); - -static DEFINE_MUTEX(mmiotrace_mutex); -static DEFINE_SPINLOCK(trace_lock); -static atomic_t mmiotrace_enabled; -static LIST_HEAD(trace_list); /* struct remap_trace */ - -/* - * Locking in this file: - * - mmiotrace_mutex enforces enable/disable_mmiotrace() critical sections. - * - mmiotrace_enabled may be modified only when holding mmiotrace_mutex - * and trace_lock. - * - Routines depending on is_enabled() must take trace_lock. - * - trace_list users must hold trace_lock. - * - is_enabled() guarantees that mmio_trace_{rw,mapping} are allowed. - * - pre/post callbacks assume the effect of is_enabled() being true. - */ - -/* module parameters */ -static unsigned long filter_offset; -static bool nommiotrace; -static bool trace_pc; - -module_param(filter_offset, ulong, 0); -module_param(nommiotrace, bool, 0); -module_param(trace_pc, bool, 0); - -MODULE_PARM_DESC(filter_offset, "Start address of traced mappings."); -MODULE_PARM_DESC(nommiotrace, "Disable actual MMIO tracing."); -MODULE_PARM_DESC(trace_pc, "Record address of faulting instructions."); - -static bool is_enabled(void) -{ - return atomic_read(&mmiotrace_enabled); -} - -static void print_pte(unsigned long address) -{ - unsigned int level; - pte_t *pte = lookup_address(address, &level); - - if (!pte) { - pr_err("Error in %s: no pte for page 0x%08lx\n", - __func__, address); - return; - } - - if (level == PG_LEVEL_2M) { - pr_emerg("4MB pages are not currently supported: 0x%08lx\n", - address); - BUG(); - } - pr_info("pte for 0x%lx: 0x%llx 0x%llx\n", - address, - (unsigned long long)pte_val(*pte), - (unsigned long long)pte_val(*pte) & _PAGE_PRESENT); -} - -/* - * For some reason the pre/post pairs have been called in an - * unmatched order. Report and die. - */ -static void die_kmmio_nesting_error(struct pt_regs *regs, unsigned long addr) -{ - const struct trap_reason *my_reason = &get_cpu_var(pf_reason); - pr_emerg("unexpected fault for address: 0x%08lx, last fault for address: 0x%08lx\n", - addr, my_reason->addr); - print_pte(addr); - print_symbol(KERN_EMERG "faulting IP is at %s\n", regs->ip); - print_symbol(KERN_EMERG "last faulting IP was at %s\n", my_reason->ip); -#ifdef __i386__ - pr_emerg("eax: %08lx ebx: %08lx ecx: %08lx edx: %08lx\n", - regs->ax, regs->bx, regs->cx, regs->dx); - pr_emerg("esi: %08lx edi: %08lx ebp: %08lx esp: %08lx\n", - regs->si, regs->di, regs->bp, regs->sp); -#else - pr_emerg("rax: %016lx rcx: %016lx rdx: %016lx\n", - regs->ax, regs->cx, regs->dx); - pr_emerg("rsi: %016lx rdi: %016lx rbp: %016lx rsp: %016lx\n", - regs->si, regs->di, regs->bp, regs->sp); -#endif - put_cpu_var(pf_reason); - BUG(); -} - -static void pre(struct kmmio_probe *p, struct pt_regs *regs, - unsigned long addr) -{ - struct trap_reason *my_reason = &get_cpu_var(pf_reason); - struct mmiotrace_rw *my_trace = &get_cpu_var(cpu_trace); - const unsigned long instptr = instruction_pointer(regs); - const enum reason_type type = get_ins_type(instptr); - struct remap_trace *trace = p->private; - - /* it doesn't make sense to have more than one active trace per cpu */ - if (my_reason->active_traces) - die_kmmio_nesting_error(regs, addr); - else - my_reason->active_traces++; - - my_reason->type = type; - my_reason->addr = addr; - my_reason->ip = instptr; - - my_trace->phys = addr - trace->probe.addr + trace->phys; - my_trace->map_id = trace->id; - - /* - * Only record the program counter when requested. - * It may taint clean-room reverse engineering. - */ - if (trace_pc) - my_trace->pc = instptr; - else - my_trace->pc = 0; - - /* - * XXX: the timestamp recorded will be *after* the tracing has been - * done, not at the time we hit the instruction. SMP implications - * on event ordering? - */ - - switch (type) { - case REG_READ: - my_trace->opcode = MMIO_READ; - my_trace->width = get_ins_mem_width(instptr); - break; - case REG_WRITE: - my_trace->opcode = MMIO_WRITE; - my_trace->width = get_ins_mem_width(instptr); - my_trace->value = get_ins_reg_val(instptr, regs); - break; - case IMM_WRITE: - my_trace->opcode = MMIO_WRITE; - my_trace->width = get_ins_mem_width(instptr); - my_trace->value = get_ins_imm_val(instptr); - break; - default: - { - unsigned char *ip = (unsigned char *)instptr; - my_trace->opcode = MMIO_UNKNOWN_OP; - my_trace->width = 0; - my_trace->value = (*ip) << 16 | *(ip + 1) << 8 | - *(ip + 2); - } - } - put_cpu_var(cpu_trace); - put_cpu_var(pf_reason); -} - -static void post(struct kmmio_probe *p, unsigned long condition, - struct pt_regs *regs) -{ - struct trap_reason *my_reason = &get_cpu_var(pf_reason); - struct mmiotrace_rw *my_trace = &get_cpu_var(cpu_trace); - - /* this should always return the active_trace count to 0 */ - my_reason->active_traces--; - if (my_reason->active_traces) { - pr_emerg("unexpected post handler"); - BUG(); - } - - switch (my_reason->type) { - case REG_READ: - my_trace->value = get_ins_reg_val(my_reason->ip, regs); - break; - default: - break; - } - - mmio_trace_rw(my_trace); - put_cpu_var(cpu_trace); - put_cpu_var(pf_reason); -} - -static void ioremap_trace_core(resource_size_t offset, unsigned long size, - void __iomem *addr) -{ - static atomic_t next_id; - struct remap_trace *trace = kmalloc(sizeof(*trace), GFP_KERNEL); - /* These are page-unaligned. */ - struct mmiotrace_map map = { - .phys = offset, - .virt = (unsigned long)addr, - .len = size, - .opcode = MMIO_PROBE - }; - - if (!trace) { - pr_err("kmalloc failed in ioremap\n"); - return; - } - - *trace = (struct remap_trace) { - .probe = { - .addr = (unsigned long)addr, - .len = size, - .pre_handler = pre, - .post_handler = post, - .private = trace - }, - .phys = offset, - .id = atomic_inc_return(&next_id) - }; - map.map_id = trace->id; - - spin_lock_irq(&trace_lock); - if (!is_enabled()) { - kfree(trace); - goto not_enabled; - } - - mmio_trace_mapping(&map); - list_add_tail(&trace->list, &trace_list); - if (!nommiotrace) - register_kmmio_probe(&trace->probe); - -not_enabled: - spin_unlock_irq(&trace_lock); -} - -void mmiotrace_ioremap(resource_size_t offset, unsigned long size, - void __iomem *addr) -{ - if (!is_enabled()) /* recheck and proper locking in *_core() */ - return; - - pr_debug("ioremap_*(0x%llx, 0x%lx) = %p\n", - (unsigned long long)offset, size, addr); - if ((filter_offset) && (offset != filter_offset)) - return; - ioremap_trace_core(offset, size, addr); -} - -static void iounmap_trace_core(volatile void __iomem *addr) -{ - struct mmiotrace_map map = { - .phys = 0, - .virt = (unsigned long)addr, - .len = 0, - .opcode = MMIO_UNPROBE - }; - struct remap_trace *trace; - struct remap_trace *tmp; - struct remap_trace *found_trace = NULL; - - pr_debug("Unmapping %p.\n", addr); - - spin_lock_irq(&trace_lock); - if (!is_enabled()) - goto not_enabled; - - list_for_each_entry_safe(trace, tmp, &trace_list, list) { - if ((unsigned long)addr == trace->probe.addr) { - if (!nommiotrace) - unregister_kmmio_probe(&trace->probe); - list_del(&trace->list); - found_trace = trace; - break; - } - } - map.map_id = (found_trace) ? found_trace->id : -1; - mmio_trace_mapping(&map); - -not_enabled: - spin_unlock_irq(&trace_lock); - if (found_trace) { - synchronize_rcu(); /* unregister_kmmio_probe() requirement */ - kfree(found_trace); - } -} - -void mmiotrace_iounmap(volatile void __iomem *addr) -{ - might_sleep(); - if (is_enabled()) /* recheck and proper locking in *_core() */ - iounmap_trace_core(addr); -} - -int mmiotrace_printk(const char *fmt, ...) -{ - int ret = 0; - va_list args; - unsigned long flags; - va_start(args, fmt); - - spin_lock_irqsave(&trace_lock, flags); - if (is_enabled()) - ret = mmio_trace_printk(fmt, args); - spin_unlock_irqrestore(&trace_lock, flags); - - va_end(args); - return ret; -} -EXPORT_SYMBOL(mmiotrace_printk); - -static void clear_trace_list(void) -{ - struct remap_trace *trace; - struct remap_trace *tmp; - - /* - * No locking required, because the caller ensures we are in a - * critical section via mutex, and is_enabled() is false, - * i.e. nothing can traverse or modify this list. - * Caller also ensures is_enabled() cannot change. - */ - list_for_each_entry(trace, &trace_list, list) { - pr_notice("purging non-iounmapped trace @0x%08lx, size 0x%lx.\n", - trace->probe.addr, trace->probe.len); - if (!nommiotrace) - unregister_kmmio_probe(&trace->probe); - } - synchronize_rcu(); /* unregister_kmmio_probe() requirement */ - - list_for_each_entry_safe(trace, tmp, &trace_list, list) { - list_del(&trace->list); - kfree(trace); - } -} - -#ifdef CONFIG_HOTPLUG_CPU -static cpumask_var_t downed_cpus; - -static void enter_uniprocessor(void) -{ - int cpu; - int err; - - if (downed_cpus == NULL && - !alloc_cpumask_var(&downed_cpus, GFP_KERNEL)) { - pr_notice("Failed to allocate mask\n"); - goto out; - } - - get_online_cpus(); - cpumask_copy(downed_cpus, cpu_online_mask); - cpumask_clear_cpu(cpumask_first(cpu_online_mask), downed_cpus); - if (num_online_cpus() > 1) - pr_notice("Disabling non-boot CPUs...\n"); - put_online_cpus(); - - for_each_cpu(cpu, downed_cpus) { - err = cpu_down(cpu); - if (!err) - pr_info("CPU%d is down.\n", cpu); - else - pr_err("Error taking CPU%d down: %d\n", cpu, err); - } -out: - if (num_online_cpus() > 1) - pr_warning("multiple CPUs still online, may miss events.\n"); -} - -/* __ref because leave_uniprocessor calls cpu_up which is __cpuinit, - but this whole function is ifdefed CONFIG_HOTPLUG_CPU */ -static void __ref leave_uniprocessor(void) -{ - int cpu; - int err; - - if (downed_cpus == NULL || cpumask_weight(downed_cpus) == 0) - return; - pr_notice("Re-enabling CPUs...\n"); - for_each_cpu(cpu, downed_cpus) { - err = cpu_up(cpu); - if (!err) - pr_info("enabled CPU%d.\n", cpu); - else - pr_err("cannot re-enable CPU%d: %d\n", cpu, err); - } -} - -#else /* !CONFIG_HOTPLUG_CPU */ -static void enter_uniprocessor(void) -{ - if (num_online_cpus() > 1) - pr_warning("multiple CPUs are online, may miss events. " - "Suggest booting with maxcpus=1 kernel argument.\n"); -} - -static void leave_uniprocessor(void) -{ -} -#endif - -void enable_mmiotrace(void) -{ - mutex_lock(&mmiotrace_mutex); - if (is_enabled()) - goto out; - - if (nommiotrace) - pr_info("MMIO tracing disabled.\n"); - kmmio_init(); - enter_uniprocessor(); - spin_lock_irq(&trace_lock); - atomic_inc(&mmiotrace_enabled); - spin_unlock_irq(&trace_lock); - pr_info("enabled.\n"); -out: - mutex_unlock(&mmiotrace_mutex); -} - -void disable_mmiotrace(void) -{ - mutex_lock(&mmiotrace_mutex); - if (!is_enabled()) - goto out; - - spin_lock_irq(&trace_lock); - atomic_dec(&mmiotrace_enabled); - BUG_ON(is_enabled()); - spin_unlock_irq(&trace_lock); - - clear_trace_list(); /* guarantees: no more kmmio callbacks */ - leave_uniprocessor(); - kmmio_cleanup(); - pr_info("disabled.\n"); -out: - mutex_unlock(&mmiotrace_mutex); -} |