config MMIOTRACE
bool "Memory mapped IO tracing"
- depends on DEBUG_KERNEL && RELAY
+ depends on DEBUG_KERNEL
select TRACING
select MMIOTRACE_HOOKS
default y
#define NAME "mmiotrace: "
-/* This app's relay channel files will appear in /debug/mmio-trace */
-static const char APP_DIR[] = "mmio-trace";
-/* the marker injection file in /debug/APP_DIR */
-static const char MARKER_FILE[] = "mmio-marker";
-
struct trap_reason {
unsigned long addr;
unsigned long ip;
unsigned long id;
};
-static const size_t subbuf_size = 256*1024;
-
/* Accessed per-cpu. */
static DEFINE_PER_CPU(struct trap_reason, pf_reason);
-static DEFINE_PER_CPU(struct mm_io_header_rw, cpu_trace);
+static DEFINE_PER_CPU(struct mmiotrace_rw, cpu_trace);
#if 0 /* XXX: no way gather this info anymore */
/* Access to this is not per-cpu. */
static DEFINE_PER_CPU(atomic_t, dropped);
#endif
-static struct dentry *dir;
static struct dentry *marker_file;
static DEFINE_MUTEX(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 chan is valid.
+ * - is_enabled() guarantees that mmio_trace_record is allowed.
* - pre/post callbacks assume the effect of is_enabled() being true.
*/
/* module parameters */
-static unsigned int n_subbufs = 32*4;
static unsigned long filter_offset;
static int nommiotrace;
static int ISA_trace;
static int trace_pc;
-module_param(n_subbufs, uint, 0);
module_param(filter_offset, ulong, 0);
module_param(nommiotrace, bool, 0);
module_param(ISA_trace, bool, 0);
module_param(trace_pc, bool, 0);
-MODULE_PARM_DESC(n_subbufs, "Number of 256kB buffers, default 128.");
MODULE_PARM_DESC(filter_offset, "Start address of traced mappings.");
MODULE_PARM_DESC(nommiotrace, "Disable actual MMIO tracing.");
MODULE_PARM_DESC(ISA_trace, "Do not exclude the low ISA range.");
return atomic_read(&mmiotrace_enabled);
}
+#if 0 /* XXX: needs rewrite */
/*
* Write callback for the debugfs entry:
* Read a marker and write it to the mmio trace log
kfree(event);
return len;
}
+#endif
static void print_pte(unsigned long address)
{
unsigned long addr)
{
struct trap_reason *my_reason = &get_cpu_var(pf_reason);
- struct mm_io_header_rw *my_trace = &get_cpu_var(cpu_trace);
+ 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->user_data;
/* it doesn't make sense to have more than one active trace per cpu */
if (my_reason->active_traces)
my_reason->addr = addr;
my_reason->ip = instptr;
- my_trace->header.type = MMIO_MAGIC;
- my_trace->header.pid = 0;
- my_trace->header.data_len = sizeof(struct mm_io_rw);
- my_trace->rw.address = addr;
- /*
- * struct remap_trace *trace = p->user_data;
- * phys = addr - trace->probe.addr + trace->phys;
- */
+ 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->rw.pc = instptr;
+ my_trace->pc = instptr;
else
- my_trace->rw.pc = 0;
+ my_trace->pc = 0;
/*
* XXX: the timestamp recorded will be *after* the tracing has been
switch (type) {
case REG_READ:
- my_trace->header.type |=
- (MMIO_READ << MMIO_OPCODE_SHIFT) |
- (get_ins_mem_width(instptr) << MMIO_WIDTH_SHIFT);
+ my_trace->opcode = MMIO_READ;
+ my_trace->width = get_ins_mem_width(instptr);
break;
case REG_WRITE:
- my_trace->header.type |=
- (MMIO_WRITE << MMIO_OPCODE_SHIFT) |
- (get_ins_mem_width(instptr) << MMIO_WIDTH_SHIFT);
- my_trace->rw.value = get_ins_reg_val(instptr, regs);
+ 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->header.type |=
- (MMIO_WRITE << MMIO_OPCODE_SHIFT) |
- (get_ins_mem_width(instptr) << MMIO_WIDTH_SHIFT);
- my_trace->rw.value = get_ins_imm_val(instptr);
+ 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->header.type |=
- (MMIO_UNKNOWN_OP << MMIO_OPCODE_SHIFT);
- my_trace->rw.value = (*ip) << 16 | *(ip + 1) << 8 |
+ my_trace->opcode = MMIO_UNKNOWN_OP;
+ my_trace->width = 0;
+ my_trace->value = (*ip) << 16 | *(ip + 1) << 8 |
*(ip + 2);
}
}
struct pt_regs *regs)
{
struct trap_reason *my_reason = &get_cpu_var(pf_reason);
- struct mm_io_header_rw *my_trace = &get_cpu_var(cpu_trace);
+ struct mmiotrace_rw *my_trace = &get_cpu_var(cpu_trace);
/* this should always return the active_trace count to 0 */
my_reason->active_traces--;
switch (my_reason->type) {
case REG_READ:
- my_trace->rw.value = get_ins_reg_val(my_reason->ip, regs);
+ my_trace->value = get_ins_reg_val(my_reason->ip, regs);
break;
default:
break;
}
- /*
- * XXX: Several required values are ignored:
- * - mapping id
- * - program counter
- * Also the address should be physical, not virtual.
- */
- mmio_trace_record(my_trace->header.type, my_trace->rw.address,
- my_trace->rw.value);
+ mmio_trace_rw(my_trace);
put_cpu_var(cpu_trace);
put_cpu_var(pf_reason);
}
{
static atomic_t next_id;
struct remap_trace *trace = kmalloc(sizeof(*trace), GFP_KERNEL);
- struct mm_io_header_map event = {
- .header = {
- .type = MMIO_MAGIC |
- (MMIO_PROBE << MMIO_OPCODE_SHIFT),
- .sec = 0,
- .nsec = 0,
- .pid = 0,
- .data_len = sizeof(struct mm_io_map)
- },
- .map = {
- .phys = offset,
- .addr = (unsigned long)addr,
- .len = size,
- .pc = 0
- }
+ struct mmiotrace_map map = {
+ .phys = offset,
+ .virt = (unsigned long)addr,
+ .len = size,
+ .opcode = MMIO_PROBE
};
if (!trace) {
.phys = offset,
.id = atomic_inc_return(&next_id)
};
+ map.map_id = trace->id;
spin_lock_irq(&trace_lock);
if (!is_enabled())
goto not_enabled;
- /*
- * XXX: Insufficient data recorded!
- */
- mmio_trace_record(event.header.type, event.map.addr, event.map.len);
+ mmio_trace_mapping(&map);
list_add_tail(&trace->list, &trace_list);
if (!nommiotrace)
register_kmmio_probe(&trace->probe);
static void iounmap_trace_core(volatile void __iomem *addr)
{
- struct mm_io_header_map event = {
- .header = {
- .type = MMIO_MAGIC |
- (MMIO_UNPROBE << MMIO_OPCODE_SHIFT),
- .sec = 0,
- .nsec = 0,
- .pid = 0,
- .data_len = sizeof(struct mm_io_map)
- },
- .map = {
- .phys = 0,
- .addr = (unsigned long)addr,
- .len = 0,
- .pc = 0
- }
+ struct mmiotrace_map map = {
+ .phys = 0,
+ .virt = (unsigned long)addr,
+ .len = 0,
+ .opcode = MMIO_UNPROBE
};
struct remap_trace *trace;
struct remap_trace *tmp;
break;
}
}
- mmio_trace_record(event.header.type, event.map.addr,
- found_trace ? found_trace->id : -1);
+ map.map_id = (found_trace) ? found_trace->id : -1;
+ mmio_trace_mapping(&map);
not_enabled:
spin_unlock_irq(&trace_lock);
}
}
+#if 0 /* XXX: out of order */
static struct file_operations fops_marker = {
.owner = THIS_MODULE,
.write = write_marker
};
+#endif
void enable_mmiotrace(void)
{
#if 0 /* XXX: tracing does not support text entries */
marker_file = debugfs_create_file("marker", 0660, dir, NULL,
&fops_marker);
-#endif
if (!marker_file)
pr_err(NAME "marker file creation failed.\n");
+#endif
if (nommiotrace)
pr_info(NAME "MMIO tracing disabled.\n");
out:
mutex_unlock(&mmiotrace_mutex);
}
-
-int __init init_mmiotrace(void)
-{
- pr_debug(NAME "load...\n");
- if (n_subbufs < 2)
- return -EINVAL;
-
- dir = debugfs_create_dir(APP_DIR, NULL);
- if (!dir) {
- pr_err(NAME "Couldn't create relay app directory.\n");
- return -ENOMEM;
- }
- return 0;
-}
}
#endif /* CONFIG_MMIOTRACE_HOOKS */
-/* in kernel/trace/trace_mmiotrace.c */
-extern int __init init_mmiotrace(void);
-extern void enable_mmiotrace(void);
-extern void disable_mmiotrace(void);
-extern void mmio_trace_record(u32 type, unsigned long addr, unsigned long arg);
-
-#endif /* __KERNEL__ */
-
-
-/*
- * If you change anything here, you must bump MMIO_VERSION.
- * This is the relay data format for user space.
- */
-#define MMIO_VERSION 0x04
-
-/* mm_io_header.type */
-#define MMIO_OPCODE_MASK 0xff
-#define MMIO_OPCODE_SHIFT 0
-#define MMIO_WIDTH_MASK 0xff00
-#define MMIO_WIDTH_SHIFT 8
-#define MMIO_MAGIC (0x6f000000 | (MMIO_VERSION<<16))
-#define MMIO_MAGIC_MASK 0xffff0000
-
-enum mm_io_opcode { /* payload type: */
- MMIO_READ = 0x1, /* struct mm_io_rw */
- MMIO_WRITE = 0x2, /* struct mm_io_rw */
- MMIO_PROBE = 0x3, /* struct mm_io_map */
- MMIO_UNPROBE = 0x4, /* struct mm_io_map */
+enum mm_io_opcode {
+ MMIO_READ = 0x1, /* struct mmiotrace_rw */
+ MMIO_WRITE = 0x2, /* struct mmiotrace_rw */
+ MMIO_PROBE = 0x3, /* struct mmiotrace_map */
+ MMIO_UNPROBE = 0x4, /* struct mmiotrace_map */
MMIO_MARKER = 0x5, /* raw char data */
- MMIO_UNKNOWN_OP = 0x6, /* struct mm_io_rw */
+ MMIO_UNKNOWN_OP = 0x6, /* struct mmiotrace_rw */
};
-struct mm_io_header {
- __u32 type; /* see MMIO_* macros above */
- __u32 sec; /* timestamp */
- __u32 nsec;
- __u32 pid; /* PID of the process, or 0 for kernel core */
- __u16 data_len; /* length of the following payload */
+struct mmiotrace_rw {
+ unsigned long phys; /* PCI address of register */
+ unsigned long value;
+ unsigned long pc; /* optional program counter */
+ int map_id;
+ unsigned char opcode; /* one of MMIO_{READ,WRITE,UNKNOWN_OP} */
+ unsigned char width; /* size of register access in bytes */
};
-struct mm_io_rw {
- __u64 address; /* virtual address of register */
- __u64 value;
- __u64 pc; /* optional program counter */
+struct mmiotrace_map {
+ unsigned long phys; /* base address in PCI space */
+ unsigned long virt; /* base virtual address */
+ unsigned long len; /* mapping size */
+ int map_id;
+ unsigned char opcode; /* MMIO_PROBE or MMIO_UNPROBE */
};
-struct mm_io_map {
- __u64 phys; /* base address in PCI space */
- __u64 addr; /* base virtual address */
- __u64 len; /* mapping size */
- __u64 pc; /* optional program counter */
-};
-
-
-/*
- * These structures are used to allow a single relay_write()
- * call to write a full packet.
- */
-
-struct mm_io_header_rw {
- struct mm_io_header header;
- struct mm_io_rw rw;
-} __attribute__((packed));
+/* in kernel/trace/trace_mmiotrace.c */
+extern void enable_mmiotrace(void);
+extern void disable_mmiotrace(void);
+extern void mmio_trace_rw(struct mmiotrace_rw *rw);
+extern void mmio_trace_mapping(struct mmiotrace_map *map);
-struct mm_io_header_map {
- struct mm_io_header header;
- struct mm_io_map map;
-} __attribute__((packed));
+#endif /* __KERNEL__ */
#endif /* MMIOTRACE_H */
trace_function(tr, data, ip, parent_ip, flags);
}
+#ifdef CONFIG_MMIOTRACE
+void __trace_mmiotrace_rw(struct trace_array *tr, struct trace_array_cpu *data,
+ struct mmiotrace_rw *rw)
+{
+ struct trace_entry *entry;
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&data->lock, irq_flags);
+ entry = tracing_get_trace_entry(tr, data);
+ tracing_generic_entry_update(entry, 0);
+ entry->type = TRACE_MMIO_RW;
+ entry->mmiorw = *rw;
+ spin_unlock_irqrestore(&data->lock, irq_flags);
+
+ trace_wake_up();
+}
+
+void __trace_mmiotrace_map(struct trace_array *tr, struct trace_array_cpu *data,
+ struct mmiotrace_map *map)
+{
+ struct trace_entry *entry;
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&data->lock, irq_flags);
+ entry = tracing_get_trace_entry(tr, data);
+ tracing_generic_entry_update(entry, 0);
+ entry->type = TRACE_MMIO_MAP;
+ entry->mmiomap = *map;
+ spin_unlock_irqrestore(&data->lock, irq_flags);
+
+ trace_wake_up();
+}
+#endif
+
void __trace_stack(struct trace_array *tr,
struct trace_array_cpu *data,
unsigned long flags,
#include <asm/atomic.h>
#include <linux/sched.h>
#include <linux/clocksource.h>
+#include <linux/mmiotrace.h>
enum trace_type {
__TRACE_FIRST_TYPE = 0,
TRACE_WAKE,
TRACE_STACK,
TRACE_SPECIAL,
+ TRACE_MMIO_RW,
+ TRACE_MMIO_MAP,
__TRACE_LAST_TYPE
};
struct ctx_switch_entry ctx;
struct special_entry special;
struct stack_entry stack;
+ struct mmiotrace_rw mmiorw;
+ struct mmiotrace_map mmiomap;
};
};
extern int DYN_FTRACE_TEST_NAME(void);
#endif
+#ifdef CONFIG_MMIOTRACE
+extern void __trace_mmiotrace_rw(struct trace_array *tr,
+ struct trace_array_cpu *data,
+ struct mmiotrace_rw *rw);
+extern void __trace_mmiotrace_map(struct trace_array *tr,
+ struct trace_array_cpu *data,
+ struct mmiotrace_map *map);
+#endif
+
#ifdef CONFIG_FTRACE_STARTUP_TEST
#ifdef CONFIG_FTRACE
extern int trace_selftest_startup_function(struct tracer *trace,
#include "trace.h"
-extern void
-__trace_special(void *__tr, void *__data,
- unsigned long arg1, unsigned long arg2, unsigned long arg3);
-
static struct trace_array *mmio_trace_array;
+static void mmio_reset_data(struct trace_array *tr)
+{
+ int cpu;
+
+ tr->time_start = ftrace_now(tr->cpu);
+
+ for_each_online_cpu(cpu)
+ tracing_reset(tr->data[cpu]);
+}
static void mmio_trace_init(struct trace_array *tr)
{
pr_debug("in %s\n", __func__);
mmio_trace_array = tr;
- if (tr->ctrl)
+ if (tr->ctrl) {
+ mmio_reset_data(tr);
enable_mmiotrace();
+ }
}
static void mmio_trace_reset(struct trace_array *tr)
pr_debug("in %s\n", __func__);
if (tr->ctrl)
disable_mmiotrace();
+ mmio_reset_data(tr);
+ mmio_trace_array = NULL;
}
static void mmio_trace_ctrl_update(struct trace_array *tr)
{
pr_debug("in %s\n", __func__);
- if (tr->ctrl)
+ if (tr->ctrl) {
+ mmio_reset_data(tr);
enable_mmiotrace();
- else
+ } else {
disable_mmiotrace();
+ }
+}
+
+/* XXX: This is not called for trace_pipe file! */
+void mmio_print_header(struct trace_iterator *iter)
+{
+ struct trace_seq *s = &iter->seq;
+ trace_seq_printf(s, "VERSION broken 20070824\n");
+ /* TODO: print /proc/bus/pci/devices contents as PCIDEV lines */
+}
+
+static int mmio_print_rw(struct trace_iterator *iter)
+{
+ struct trace_entry *entry = iter->ent;
+ struct mmiotrace_rw *rw = &entry->mmiorw;
+ struct trace_seq *s = &iter->seq;
+ unsigned long long t = ns2usecs(entry->t);
+ unsigned long usec_rem = do_div(t, 1000000ULL);
+ unsigned secs = (unsigned long)t;
+ int ret = 1;
+
+ switch (entry->mmiorw.opcode) {
+ case MMIO_READ:
+ ret = trace_seq_printf(s,
+ "R %d %lu.%06lu %d 0x%lx 0x%lx 0x%lx %d\n",
+ rw->width, secs, usec_rem, rw->map_id, rw->phys,
+ rw->value, rw->pc, entry->pid);
+ break;
+ case MMIO_WRITE:
+ ret = trace_seq_printf(s,
+ "W %d %lu.%06lu %d 0x%lx 0x%lx 0x%lx %d\n",
+ rw->width, secs, usec_rem, rw->map_id, rw->phys,
+ rw->value, rw->pc, entry->pid);
+ break;
+ case MMIO_UNKNOWN_OP:
+ ret = trace_seq_printf(s,
+ "UNKNOWN %lu.%06lu %d 0x%lx %02x,%02x,%02x 0x%lx %d\n",
+ secs, usec_rem, rw->map_id, rw->phys,
+ (rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff,
+ (rw->value >> 0) & 0xff, rw->pc, entry->pid);
+ break;
+ default:
+ ret = trace_seq_printf(s, "rw what?\n");
+ break;
+ }
+ if (ret)
+ return 1;
+ return 0;
+}
+
+static int mmio_print_map(struct trace_iterator *iter)
+{
+ struct trace_entry *entry = iter->ent;
+ struct mmiotrace_map *m = &entry->mmiomap;
+ struct trace_seq *s = &iter->seq;
+ unsigned long long t = ns2usecs(entry->t);
+ unsigned long usec_rem = do_div(t, 1000000ULL);
+ unsigned secs = (unsigned long)t;
+ int ret = 1;
+
+ switch (entry->mmiorw.opcode) {
+ case MMIO_PROBE:
+ ret = trace_seq_printf(s,
+ "MAP %lu.%06lu %d 0x%lx 0x%lx 0x%lx 0x%lx %d\n",
+ secs, usec_rem, m->map_id, m->phys, m->virt, m->len,
+ 0UL, entry->pid);
+ break;
+ case MMIO_UNPROBE:
+ ret = trace_seq_printf(s,
+ "UNMAP %lu.%06lu %d 0x%lx %d\n",
+ secs, usec_rem, m->map_id, 0UL, entry->pid);
+ break;
+ default:
+ ret = trace_seq_printf(s, "map what?\n");
+ break;
+ }
+ if (ret)
+ return 1;
+ return 0;
+}
+
+/* return 0 to abort printing without consuming current entry in pipe mode */
+static int mmio_print_line(struct trace_iterator *iter)
+{
+ switch (iter->ent->type) {
+ case TRACE_MMIO_RW:
+ return mmio_print_rw(iter);
+ case TRACE_MMIO_MAP:
+ return mmio_print_map(iter);
+ default:
+ return 1; /* ignore unknown entries */
+ }
}
static struct tracer mmio_tracer __read_mostly =
.name = "mmiotrace",
.init = mmio_trace_init,
.reset = mmio_trace_reset,
+ .open = mmio_print_header,
.ctrl_update = mmio_trace_ctrl_update,
+ .print_line = mmio_print_line,
};
__init static int init_mmio_trace(void)
{
- int ret = init_mmiotrace();
- if (ret)
- return ret;
return register_tracer(&mmio_tracer);
}
device_initcall(init_mmio_trace);
-void mmio_trace_record(u32 type, unsigned long addr, unsigned long arg)
+void mmio_trace_rw(struct mmiotrace_rw *rw)
{
struct trace_array *tr = mmio_trace_array;
struct trace_array_cpu *data = tr->data[smp_processor_id()];
+ __trace_mmiotrace_rw(tr, data, rw);
+}
- if (!current || current->pid == 0) {
- /*
- * XXX: This is a problem. We need to able to record, no
- * matter what. tracing_generic_entry_update() would crash.
- */
- static unsigned limit;
- if (limit++ < 12)
- pr_err("Error in %s: no current.\n", __func__);
- return;
- }
- if (!tr || !data) {
- static unsigned limit;
- if (limit++ < 12)
- pr_err("%s: no tr or data\n", __func__);
- return;
- }
- __trace_special(tr, data, type, addr, arg);
+void mmio_trace_mapping(struct mmiotrace_map *map)
+{
+ struct trace_array *tr = mmio_trace_array;
+ struct trace_array_cpu *data;
+
+ preempt_disable();
+ data = tr->data[smp_processor_id()];
+ __trace_mmiotrace_map(tr, data, map);
+ preempt_enable();
}
projects / linux-2.6 / commitdiff