ftrace: mmiotrace, updates
here is a patch that makes mmiotrace work almost well within the tracing framework. The patch applies on top of my previous patch. I have my own output formatting in place now. Summary of changes: - fix the NULL dereference that was due to not calling tracing_reset() - add print_line() callback into struct tracer - implement print_line() for mmiotrace, producing up-to-spec text - add my output header, but that is not really called in the right place - rewrote the main structs in mmiotrace - added two new trace entry types: TRACE_MMIO_RW and TRACE_MMIO_MAP - made some functions in trace.c non-static - check current==NULL in tracing_generic_entry_update() - fix(?) comparison in trace_seq_printf() Things seem to work fine except a few issues. Markers (text lines injected into mmiotrace log) are missing, I did not feel hacking them in before we have variable length entries. My output header is printed only for 'trace' file, but not 'trace_pipe'. For some reason, despite my quick fix, iter->trace is NULL in print_trace_line() when called from 'trace_pipe' file, which means I don't get proper output formatting. I only tried by loading nouveau.ko, which just detects the card, and that is traced fine. I didn't try further. Map, two reads and unmap. Works perfectly. I am missing the information about overflows, I'd prefer to have a counter for lost events. I didn't try, but I guess currently there is no way of knowning when it overflows? So, not too far from being fully operational, it seems :-) And looking at the diffstat, there also is some 700-900 lines of user space code that just became obsolete. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>hifive-unleashed-5.1
Pekka Paalanen
Thomas Gleixner
parent
f984b51e07
commit
bd8ac686c7
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@ -173,7 +173,7 @@ config MMIOTRACE_HOOKS
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config MMIOTRACE
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bool "Memory mapped IO tracing"
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depends on DEBUG_KERNEL && RELAY
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depends on DEBUG_KERNEL
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select TRACING
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select MMIOTRACE_HOOKS
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default y
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@ -37,11 +37,6 @@
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#define NAME "mmiotrace: "
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/* This app's relay channel files will appear in /debug/mmio-trace */
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static const char APP_DIR[] = "mmio-trace";
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/* the marker injection file in /debug/APP_DIR */
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static const char MARKER_FILE[] = "mmio-marker";
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struct trap_reason {
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unsigned long addr;
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unsigned long ip;
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@ -56,18 +51,15 @@ struct remap_trace {
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unsigned long id;
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};
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static const size_t subbuf_size = 256*1024;
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/* Accessed per-cpu. */
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static DEFINE_PER_CPU(struct trap_reason, pf_reason);
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static DEFINE_PER_CPU(struct mm_io_header_rw, cpu_trace);
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static DEFINE_PER_CPU(struct mmiotrace_rw, cpu_trace);
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#if 0 /* XXX: no way gather this info anymore */
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/* Access to this is not per-cpu. */
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static DEFINE_PER_CPU(atomic_t, dropped);
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#endif
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static struct dentry *dir;
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static struct dentry *marker_file;
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static DEFINE_MUTEX(mmiotrace_mutex);
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@ -82,24 +74,21 @@ static LIST_HEAD(trace_list); /* struct remap_trace */
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* and trace_lock.
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* - Routines depending on is_enabled() must take trace_lock.
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* - trace_list users must hold trace_lock.
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* - is_enabled() guarantees that chan is valid.
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* - is_enabled() guarantees that mmio_trace_record is allowed.
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* - pre/post callbacks assume the effect of is_enabled() being true.
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*/
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/* module parameters */
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static unsigned int n_subbufs = 32*4;
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static unsigned long filter_offset;
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static int nommiotrace;
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static int ISA_trace;
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static int trace_pc;
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module_param(n_subbufs, uint, 0);
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module_param(filter_offset, ulong, 0);
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module_param(nommiotrace, bool, 0);
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module_param(ISA_trace, bool, 0);
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module_param(trace_pc, bool, 0);
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MODULE_PARM_DESC(n_subbufs, "Number of 256kB buffers, default 128.");
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MODULE_PARM_DESC(filter_offset, "Start address of traced mappings.");
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MODULE_PARM_DESC(nommiotrace, "Disable actual MMIO tracing.");
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MODULE_PARM_DESC(ISA_trace, "Do not exclude the low ISA range.");
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@ -110,6 +99,7 @@ static bool is_enabled(void)
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return atomic_read(&mmiotrace_enabled);
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}
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#if 0 /* XXX: needs rewrite */
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/*
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* Write callback for the debugfs entry:
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* Read a marker and write it to the mmio trace log
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@ -145,6 +135,7 @@ static ssize_t write_marker(struct file *file, const char __user *buffer,
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kfree(event);
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return len;
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}
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#endif
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static void print_pte(unsigned long address)
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{
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@ -198,9 +189,10 @@ static void pre(struct kmmio_probe *p, struct pt_regs *regs,
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unsigned long addr)
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{
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struct trap_reason *my_reason = &get_cpu_var(pf_reason);
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struct mm_io_header_rw *my_trace = &get_cpu_var(cpu_trace);
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struct mmiotrace_rw *my_trace = &get_cpu_var(cpu_trace);
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const unsigned long instptr = instruction_pointer(regs);
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const enum reason_type type = get_ins_type(instptr);
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struct remap_trace *trace = p->user_data;
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/* it doesn't make sense to have more than one active trace per cpu */
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if (my_reason->active_traces)
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@ -212,23 +204,17 @@ static void pre(struct kmmio_probe *p, struct pt_regs *regs,
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my_reason->addr = addr;
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my_reason->ip = instptr;
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my_trace->header.type = MMIO_MAGIC;
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my_trace->header.pid = 0;
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my_trace->header.data_len = sizeof(struct mm_io_rw);
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my_trace->rw.address = addr;
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/*
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* struct remap_trace *trace = p->user_data;
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* phys = addr - trace->probe.addr + trace->phys;
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*/
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my_trace->phys = addr - trace->probe.addr + trace->phys;
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my_trace->map_id = trace->id;
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/*
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* Only record the program counter when requested.
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* It may taint clean-room reverse engineering.
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*/
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if (trace_pc)
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my_trace->rw.pc = instptr;
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my_trace->pc = instptr;
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else
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my_trace->rw.pc = 0;
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my_trace->pc = 0;
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/*
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* XXX: the timestamp recorded will be *after* the tracing has been
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@ -238,28 +224,25 @@ static void pre(struct kmmio_probe *p, struct pt_regs *regs,
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switch (type) {
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case REG_READ:
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my_trace->header.type |=
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(MMIO_READ << MMIO_OPCODE_SHIFT) |
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(get_ins_mem_width(instptr) << MMIO_WIDTH_SHIFT);
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my_trace->opcode = MMIO_READ;
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my_trace->width = get_ins_mem_width(instptr);
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break;
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case REG_WRITE:
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my_trace->header.type |=
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(MMIO_WRITE << MMIO_OPCODE_SHIFT) |
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(get_ins_mem_width(instptr) << MMIO_WIDTH_SHIFT);
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my_trace->rw.value = get_ins_reg_val(instptr, regs);
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my_trace->opcode = MMIO_WRITE;
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my_trace->width = get_ins_mem_width(instptr);
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my_trace->value = get_ins_reg_val(instptr, regs);
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break;
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case IMM_WRITE:
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my_trace->header.type |=
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(MMIO_WRITE << MMIO_OPCODE_SHIFT) |
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(get_ins_mem_width(instptr) << MMIO_WIDTH_SHIFT);
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my_trace->rw.value = get_ins_imm_val(instptr);
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my_trace->opcode = MMIO_WRITE;
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my_trace->width = get_ins_mem_width(instptr);
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my_trace->value = get_ins_imm_val(instptr);
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break;
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default:
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{
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unsigned char *ip = (unsigned char *)instptr;
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my_trace->header.type |=
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(MMIO_UNKNOWN_OP << MMIO_OPCODE_SHIFT);
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my_trace->rw.value = (*ip) << 16 | *(ip + 1) << 8 |
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my_trace->opcode = MMIO_UNKNOWN_OP;
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my_trace->width = 0;
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my_trace->value = (*ip) << 16 | *(ip + 1) << 8 |
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*(ip + 2);
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}
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}
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@ -271,7 +254,7 @@ static void post(struct kmmio_probe *p, unsigned long condition,
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struct pt_regs *regs)
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{
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struct trap_reason *my_reason = &get_cpu_var(pf_reason);
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struct mm_io_header_rw *my_trace = &get_cpu_var(cpu_trace);
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struct mmiotrace_rw *my_trace = &get_cpu_var(cpu_trace);
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/* this should always return the active_trace count to 0 */
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my_reason->active_traces--;
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@ -282,20 +265,13 @@ static void post(struct kmmio_probe *p, unsigned long condition,
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switch (my_reason->type) {
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case REG_READ:
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my_trace->rw.value = get_ins_reg_val(my_reason->ip, regs);
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my_trace->value = get_ins_reg_val(my_reason->ip, regs);
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break;
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default:
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break;
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}
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/*
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* XXX: Several required values are ignored:
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* - mapping id
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* - program counter
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* Also the address should be physical, not virtual.
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*/
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mmio_trace_record(my_trace->header.type, my_trace->rw.address,
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my_trace->rw.value);
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mmio_trace_rw(my_trace);
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put_cpu_var(cpu_trace);
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put_cpu_var(pf_reason);
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}
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@ -305,21 +281,11 @@ static void ioremap_trace_core(unsigned long offset, unsigned long size,
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{
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static atomic_t next_id;
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struct remap_trace *trace = kmalloc(sizeof(*trace), GFP_KERNEL);
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struct mm_io_header_map event = {
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.header = {
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.type = MMIO_MAGIC |
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(MMIO_PROBE << MMIO_OPCODE_SHIFT),
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.sec = 0,
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.nsec = 0,
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.pid = 0,
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.data_len = sizeof(struct mm_io_map)
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},
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.map = {
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.phys = offset,
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.addr = (unsigned long)addr,
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.len = size,
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.pc = 0
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}
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struct mmiotrace_map map = {
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.phys = offset,
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.virt = (unsigned long)addr,
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.len = size,
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.opcode = MMIO_PROBE
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};
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if (!trace) {
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@ -338,15 +304,13 @@ static void ioremap_trace_core(unsigned long offset, unsigned long size,
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.phys = offset,
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.id = atomic_inc_return(&next_id)
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};
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map.map_id = trace->id;
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spin_lock_irq(&trace_lock);
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if (!is_enabled())
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goto not_enabled;
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/*
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* XXX: Insufficient data recorded!
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*/
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mmio_trace_record(event.header.type, event.map.addr, event.map.len);
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mmio_trace_mapping(&map);
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list_add_tail(&trace->list, &trace_list);
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if (!nommiotrace)
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register_kmmio_probe(&trace->probe);
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@ -369,21 +333,11 @@ mmiotrace_ioremap(unsigned long offset, unsigned long size, void __iomem *addr)
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static void iounmap_trace_core(volatile void __iomem *addr)
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{
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struct mm_io_header_map event = {
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.header = {
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.type = MMIO_MAGIC |
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(MMIO_UNPROBE << MMIO_OPCODE_SHIFT),
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.sec = 0,
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.nsec = 0,
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.pid = 0,
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.data_len = sizeof(struct mm_io_map)
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},
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.map = {
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.phys = 0,
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.addr = (unsigned long)addr,
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.len = 0,
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.pc = 0
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}
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struct mmiotrace_map map = {
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.phys = 0,
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.virt = (unsigned long)addr,
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.len = 0,
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.opcode = MMIO_UNPROBE
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};
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struct remap_trace *trace;
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struct remap_trace *tmp;
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@ -404,8 +358,8 @@ static void iounmap_trace_core(volatile void __iomem *addr)
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break;
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}
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}
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mmio_trace_record(event.header.type, event.map.addr,
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found_trace ? found_trace->id : -1);
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map.map_id = (found_trace) ? found_trace->id : -1;
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mmio_trace_mapping(&map);
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not_enabled:
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spin_unlock_irq(&trace_lock);
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@ -448,10 +402,12 @@ static void clear_trace_list(void)
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}
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}
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#if 0 /* XXX: out of order */
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static struct file_operations fops_marker = {
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.owner = THIS_MODULE,
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.write = write_marker
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};
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#endif
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void enable_mmiotrace(void)
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{
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@ -464,9 +420,9 @@ void enable_mmiotrace(void)
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#if 0 /* XXX: tracing does not support text entries */
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marker_file = debugfs_create_file("marker", 0660, dir, NULL,
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&fops_marker);
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#endif
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if (!marker_file)
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pr_err(NAME "marker file creation failed.\n");
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#endif
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if (nommiotrace)
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pr_info(NAME "MMIO tracing disabled.\n");
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@ -502,17 +458,3 @@ void disable_mmiotrace(void)
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out:
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mutex_unlock(&mmiotrace_mutex);
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}
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int __init init_mmiotrace(void)
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{
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pr_debug(NAME "load...\n");
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if (n_subbufs < 2)
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return -EINVAL;
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dir = debugfs_create_dir(APP_DIR, NULL);
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if (!dir) {
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pr_err(NAME "Couldn't create relay app directory.\n");
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return -ENOMEM;
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}
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return 0;
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}
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@ -54,73 +54,38 @@ static inline void mmiotrace_iounmap(volatile void __iomem *addr)
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}
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#endif /* CONFIG_MMIOTRACE_HOOKS */
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enum mm_io_opcode {
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MMIO_READ = 0x1, /* struct mmiotrace_rw */
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MMIO_WRITE = 0x2, /* struct mmiotrace_rw */
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MMIO_PROBE = 0x3, /* struct mmiotrace_map */
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MMIO_UNPROBE = 0x4, /* struct mmiotrace_map */
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MMIO_MARKER = 0x5, /* raw char data */
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MMIO_UNKNOWN_OP = 0x6, /* struct mmiotrace_rw */
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};
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struct mmiotrace_rw {
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unsigned long phys; /* PCI address of register */
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unsigned long value;
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unsigned long pc; /* optional program counter */
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int map_id;
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unsigned char opcode; /* one of MMIO_{READ,WRITE,UNKNOWN_OP} */
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unsigned char width; /* size of register access in bytes */
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};
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struct mmiotrace_map {
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unsigned long phys; /* base address in PCI space */
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unsigned long virt; /* base virtual address */
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unsigned long len; /* mapping size */
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int map_id;
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unsigned char opcode; /* MMIO_PROBE or MMIO_UNPROBE */
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};
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/* in kernel/trace/trace_mmiotrace.c */
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extern int __init init_mmiotrace(void);
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extern void enable_mmiotrace(void);
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extern void disable_mmiotrace(void);
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extern void mmio_trace_record(u32 type, unsigned long addr, unsigned long arg);
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extern void mmio_trace_rw(struct mmiotrace_rw *rw);
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extern void mmio_trace_mapping(struct mmiotrace_map *map);
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#endif /* __KERNEL__ */
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/*
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* If you change anything here, you must bump MMIO_VERSION.
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* This is the relay data format for user space.
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*/
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#define MMIO_VERSION 0x04
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/* mm_io_header.type */
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#define MMIO_OPCODE_MASK 0xff
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#define MMIO_OPCODE_SHIFT 0
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#define MMIO_WIDTH_MASK 0xff00
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#define MMIO_WIDTH_SHIFT 8
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#define MMIO_MAGIC (0x6f000000 | (MMIO_VERSION<<16))
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#define MMIO_MAGIC_MASK 0xffff0000
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enum mm_io_opcode { /* payload type: */
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MMIO_READ = 0x1, /* struct mm_io_rw */
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MMIO_WRITE = 0x2, /* struct mm_io_rw */
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MMIO_PROBE = 0x3, /* struct mm_io_map */
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MMIO_UNPROBE = 0x4, /* struct mm_io_map */
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MMIO_MARKER = 0x5, /* raw char data */
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MMIO_UNKNOWN_OP = 0x6, /* struct mm_io_rw */
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};
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struct mm_io_header {
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__u32 type; /* see MMIO_* macros above */
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__u32 sec; /* timestamp */
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__u32 nsec;
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__u32 pid; /* PID of the process, or 0 for kernel core */
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__u16 data_len; /* length of the following payload */
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};
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struct mm_io_rw {
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__u64 address; /* virtual address of register */
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__u64 value;
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__u64 pc; /* optional program counter */
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};
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struct mm_io_map {
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__u64 phys; /* base address in PCI space */
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__u64 addr; /* base virtual address */
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__u64 len; /* mapping size */
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__u64 pc; /* optional program counter */
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};
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/*
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* These structures are used to allow a single relay_write()
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* call to write a full packet.
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*/
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struct mm_io_header_rw {
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struct mm_io_header header;
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struct mm_io_rw rw;
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} __attribute__((packed));
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struct mm_io_header_map {
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struct mm_io_header header;
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struct mm_io_map map;
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} __attribute__((packed));
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#endif /* MMIOTRACE_H */
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|
|
@ -831,6 +831,40 @@ ftrace(struct trace_array *tr, struct trace_array_cpu *data,
|
|||
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,
|
||||
|
|
|
|||
|
|
@ -5,6 +5,7 @@
|
|||
#include <asm/atomic.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/clocksource.h>
|
||||
#include <linux/mmiotrace.h>
|
||||
|
||||
enum trace_type {
|
||||
__TRACE_FIRST_TYPE = 0,
|
||||
|
|
@ -14,6 +15,8 @@ enum trace_type {
|
|||
TRACE_WAKE,
|
||||
TRACE_STACK,
|
||||
TRACE_SPECIAL,
|
||||
TRACE_MMIO_RW,
|
||||
TRACE_MMIO_MAP,
|
||||
|
||||
__TRACE_LAST_TYPE
|
||||
};
|
||||
|
|
@ -75,6 +78,8 @@ struct trace_entry {
|
|||
struct ctx_switch_entry ctx;
|
||||
struct special_entry special;
|
||||
struct stack_entry stack;
|
||||
struct mmiotrace_rw mmiorw;
|
||||
struct mmiotrace_map mmiomap;
|
||||
};
|
||||
};
|
||||
|
||||
|
|
@ -255,6 +260,15 @@ extern unsigned long ftrace_update_tot_cnt;
|
|||
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,
|
||||
|
|
|
|||
|
|
@ -11,19 +11,26 @@
|
|||
|
||||
#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)
|
||||
|
|
@ -31,15 +38,110 @@ 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 =
|
||||
|
|
@ -47,38 +149,31 @@ 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()];
|
||||
|
||||
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);
|
||||
__trace_mmiotrace_rw(tr, data, rw);
|
||||
}
|
||||
|
||||
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();
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue