#include <linux/capability.h>
#include <linux/rcupdate.h>
#include <linux/completion.h>
+#include <linux/tracehook.h>
#include <asm/errno.h>
#include <asm/intrinsics.h>
unsigned long th_pmcs[PFM_NUM_PMC_REGS]; /* PMC thread save state */
unsigned long th_pmds[PFM_NUM_PMD_REGS]; /* PMD thread save state */
- u64 ctx_saved_psr_up; /* only contains psr.up value */
+ unsigned long ctx_saved_psr_up; /* only contains psr.up value */
unsigned long ctx_last_activation; /* context last activation number for last_cpu */
unsigned int ctx_last_cpu; /* CPU id of current or last CPU used (SMP only) */
}
static pfm_context_t *
-pfm_context_alloc(void)
+pfm_context_alloc(int ctx_flags)
{
pfm_context_t *ctx;
ctx = kzalloc(sizeof(pfm_context_t), GFP_KERNEL);
if (ctx) {
DPRINT(("alloc ctx @%p\n", ctx));
+
+ /*
+ * init context protection lock
+ */
+ spin_lock_init(&ctx->ctx_lock);
+
+ /*
+ * context is unloaded
+ */
+ ctx->ctx_state = PFM_CTX_UNLOADED;
+
+ /*
+ * initialization of context's flags
+ */
+ ctx->ctx_fl_block = (ctx_flags & PFM_FL_NOTIFY_BLOCK) ? 1 : 0;
+ ctx->ctx_fl_system = (ctx_flags & PFM_FL_SYSTEM_WIDE) ? 1: 0;
+ ctx->ctx_fl_no_msg = (ctx_flags & PFM_FL_OVFL_NO_MSG) ? 1: 0;
+ /*
+ * will move to set properties
+ * ctx->ctx_fl_excl_idle = (ctx_flags & PFM_FL_EXCL_IDLE) ? 1: 0;
+ */
+
+ /*
+ * init restart semaphore to locked
+ */
+ init_completion(&ctx->ctx_restart_done);
+
+ /*
+ * activation is used in SMP only
+ */
+ ctx->ctx_last_activation = PFM_INVALID_ACTIVATION;
+ SET_LAST_CPU(ctx, -1);
+
+ /*
+ * initialize notification message queue
+ */
+ ctx->ctx_msgq_head = ctx->ctx_msgq_tail = 0;
+ init_waitqueue_head(&ctx->ctx_msgq_wait);
+ init_waitqueue_head(&ctx->ctx_zombieq);
+
}
return ctx;
}
int ret;
DPRINT(("calling CPU%d for cleanup\n", ctx->ctx_cpu));
- ret = smp_call_function_single(ctx->ctx_cpu, pfm_syswide_force_stop, ctx, 0, 1);
+ ret = smp_call_function_single(ctx->ctx_cpu, pfm_syswide_force_stop, ctx, 1);
DPRINT(("called CPU%d for cleanup ret=%d\n", ctx->ctx_cpu, ret));
}
#endif /* CONFIG_SMP */
* invoked after, it will find an empty queue and no
* signal will be sent. In both case, we are safe
*/
- if (filp->f_flags & FASYNC) {
- DPRINT(("cleaning up async_queue=%p\n", ctx->ctx_async_queue));
- pfm_do_fasync (-1, filp, ctx, 0);
- }
-
PROTECT_CTX(ctx, flags);
state = ctx->ctx_state;
return 1;
}
-static struct dentry_operations pfmfs_dentry_operations = {
+static const struct dentry_operations pfmfs_dentry_operations = {
.d_delete = pfmfs_delete_dentry,
};
-static int
-pfm_alloc_fd(struct file **cfile)
+static struct file *
+pfm_alloc_file(pfm_context_t *ctx)
{
- int fd, ret = 0;
- struct file *file = NULL;
- struct inode * inode;
+ struct file *file;
+ struct inode *inode;
+ struct dentry *dentry;
char name[32];
struct qstr this;
- fd = get_unused_fd();
- if (fd < 0) return -ENFILE;
-
- ret = -ENFILE;
-
- file = get_empty_filp();
- if (!file) goto out;
-
/*
* allocate a new inode
*/
inode = new_inode(pfmfs_mnt->mnt_sb);
- if (!inode) goto out;
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
DPRINT(("new inode ino=%ld @%p\n", inode->i_ino, inode));
inode->i_mode = S_IFCHR|S_IRUGO;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
sprintf(name, "[%lu]", inode->i_ino);
this.name = name;
this.len = strlen(name);
this.hash = inode->i_ino;
- ret = -ENOMEM;
-
/*
* allocate a new dcache entry
*/
- file->f_path.dentry = d_alloc(pfmfs_mnt->mnt_sb->s_root, &this);
- if (!file->f_path.dentry) goto out;
+ dentry = d_alloc(pfmfs_mnt->mnt_sb->s_root, &this);
+ if (!dentry) {
+ iput(inode);
+ return ERR_PTR(-ENOMEM);
+ }
- file->f_path.dentry->d_op = &pfmfs_dentry_operations;
+ dentry->d_op = &pfmfs_dentry_operations;
+ d_add(dentry, inode);
- d_add(file->f_path.dentry, inode);
- file->f_path.mnt = mntget(pfmfs_mnt);
- file->f_mapping = inode->i_mapping;
+ file = alloc_file(pfmfs_mnt, dentry, FMODE_READ, &pfm_file_ops);
+ if (!file) {
+ dput(dentry);
+ return ERR_PTR(-ENFILE);
+ }
- file->f_op = &pfm_file_ops;
- file->f_mode = FMODE_READ;
file->f_flags = O_RDONLY;
- file->f_pos = 0;
-
- /*
- * may have to delay until context is attached?
- */
- fd_install(fd, file);
-
- /*
- * the file structure we will use
- */
- *cfile = file;
+ file->private_data = ctx;
- return fd;
-out:
- if (file) put_filp(file);
- put_unused_fd(fd);
- return ret;
-}
-
-static void
-pfm_free_fd(int fd, struct file *file)
-{
- struct files_struct *files = current->files;
- struct fdtable *fdt;
-
- /*
- * there ie no fd_uninstall(), so we do it here
- */
- spin_lock(&files->file_lock);
- fdt = files_fdtable(files);
- rcu_assign_pointer(fdt->fd[fd], NULL);
- spin_unlock(&files->file_lock);
-
- if (file)
- put_filp(file);
- put_unused_fd(fd);
+ return file;
}
static int
static int
pfm_bad_permissions(struct task_struct *task)
{
+ const struct cred *tcred;
+ uid_t uid = current_uid();
+ gid_t gid = current_gid();
+ int ret;
+
+ rcu_read_lock();
+ tcred = __task_cred(task);
+
/* inspired by ptrace_attach() */
DPRINT(("cur: uid=%d gid=%d task: euid=%d suid=%d uid=%d egid=%d sgid=%d\n",
- current->uid,
- current->gid,
- task->euid,
- task->suid,
- task->uid,
- task->egid,
- task->sgid));
-
- return ((current->uid != task->euid)
- || (current->uid != task->suid)
- || (current->uid != task->uid)
- || (current->gid != task->egid)
- || (current->gid != task->sgid)
- || (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE);
+ uid,
+ gid,
+ tcred->euid,
+ tcred->suid,
+ tcred->uid,
+ tcred->egid,
+ tcred->sgid));
+
+ ret = ((uid != tcred->euid)
+ || (uid != tcred->suid)
+ || (uid != tcred->uid)
+ || (gid != tcred->egid)
+ || (gid != tcred->sgid)
+ || (gid != tcred->gid)) && !capable(CAP_SYS_PTRACE);
+
+ rcu_read_unlock();
+ return ret;
}
static int
/* link buffer format and context */
ctx->ctx_buf_fmt = fmt;
+ ctx->ctx_fl_is_sampling = 1; /* assume record() is defined */
/*
* check if buffer format wants to use perfmon buffer allocation/mapping service
/*
* make sure the task is off any CPU
*/
- wait_task_inactive(task);
+ wait_task_inactive(task, 0);
/* more to come... */
{
pfarg_context_t *req = (pfarg_context_t *)arg;
struct file *filp;
+ struct path path;
int ctx_flags;
+ int fd;
int ret;
/* let's check the arguments first */
ret = pfarg_is_sane(current, req);
- if (ret < 0) return ret;
+ if (ret < 0)
+ return ret;
ctx_flags = req->ctx_flags;
ret = -ENOMEM;
- ctx = pfm_context_alloc();
- if (!ctx) goto error;
+ fd = get_unused_fd();
+ if (fd < 0)
+ return fd;
- ret = pfm_alloc_fd(&filp);
- if (ret < 0) goto error_file;
+ ctx = pfm_context_alloc(ctx_flags);
+ if (!ctx)
+ goto error;
- req->ctx_fd = ctx->ctx_fd = ret;
+ filp = pfm_alloc_file(ctx);
+ if (IS_ERR(filp)) {
+ ret = PTR_ERR(filp);
+ goto error_file;
+ }
- /*
- * attach context to file
- */
- filp->private_data = ctx;
+ req->ctx_fd = ctx->ctx_fd = fd;
/*
* does the user want to sample?
*/
if (pfm_uuid_cmp(req->ctx_smpl_buf_id, pfm_null_uuid)) {
ret = pfm_setup_buffer_fmt(current, filp, ctx, ctx_flags, 0, req);
- if (ret) goto buffer_error;
+ if (ret)
+ goto buffer_error;
}
- /*
- * init context protection lock
- */
- spin_lock_init(&ctx->ctx_lock);
-
- /*
- * context is unloaded
- */
- ctx->ctx_state = PFM_CTX_UNLOADED;
-
- /*
- * initialization of context's flags
- */
- ctx->ctx_fl_block = (ctx_flags & PFM_FL_NOTIFY_BLOCK) ? 1 : 0;
- ctx->ctx_fl_system = (ctx_flags & PFM_FL_SYSTEM_WIDE) ? 1: 0;
- ctx->ctx_fl_is_sampling = ctx->ctx_buf_fmt ? 1 : 0; /* assume record() is defined */
- ctx->ctx_fl_no_msg = (ctx_flags & PFM_FL_OVFL_NO_MSG) ? 1: 0;
- /*
- * will move to set properties
- * ctx->ctx_fl_excl_idle = (ctx_flags & PFM_FL_EXCL_IDLE) ? 1: 0;
- */
-
- /*
- * init restart semaphore to locked
- */
- init_completion(&ctx->ctx_restart_done);
-
- /*
- * activation is used in SMP only
- */
- ctx->ctx_last_activation = PFM_INVALID_ACTIVATION;
- SET_LAST_CPU(ctx, -1);
-
- /*
- * initialize notification message queue
- */
- ctx->ctx_msgq_head = ctx->ctx_msgq_tail = 0;
- init_waitqueue_head(&ctx->ctx_msgq_wait);
- init_waitqueue_head(&ctx->ctx_zombieq);
-
DPRINT(("ctx=%p flags=0x%x system=%d notify_block=%d excl_idle=%d no_msg=%d ctx_fd=%d \n",
ctx,
ctx_flags,
*/
pfm_reset_pmu_state(ctx);
+ fd_install(fd, filp);
+
return 0;
buffer_error:
- pfm_free_fd(ctx->ctx_fd, filp);
+ path = filp->f_path;
+ put_filp(filp);
+ path_put(&path);
if (ctx->ctx_buf_fmt) {
pfm_buf_fmt_exit(ctx->ctx_buf_fmt, current, NULL, regs);
pfm_context_free(ctx);
error:
+ put_unused_fd(fd);
return ret;
}
* IA64_THREAD_DBG_VALID set. This indicates a task which was
* able to use the debug registers for debugging purposes via
* ptrace(). Therefore we know it was not using them for
- * perfmormance monitoring, so we only decrement the number
+ * performance monitoring, so we only decrement the number
* of "ptraced" debug register users to keep the count up to date
*/
int
PFM_SET_WORK_PENDING(task, 1);
- tsk_set_notify_resume(task);
+ set_notify_resume(task);
/*
* XXX: send reschedule if task runs on another CPU
UNPROTECT_CTX(ctx, flags);
- wait_task_inactive(task);
+ wait_task_inactive(task, 0);
PROTECT_CTX(ctx, flags);
}
static int pfm_ovfl_notify_user(pfm_context_t *ctx, unsigned long ovfl_pmds);
+
/*
* pfm_handle_work() can be called with interrupts enabled
* (TIF_NEED_RESCHED) or disabled. The down_interruptible
* call may sleep, therefore we must re-enable interrupts
* to avoid deadlocks. It is safe to do so because this function
- * is called ONLY when returning to user level (PUStk=1), in which case
+ * is called ONLY when returning to user level (pUStk=1), in which case
* there is no risk of kernel stack overflow due to deep
* interrupt nesting.
*/
ctx = PFM_GET_CTX(current);
if (ctx == NULL) {
- printk(KERN_ERR "perfmon: [%d] has no PFM context\n", task_pid_nr(current));
+ printk(KERN_ERR "perfmon: [%d] has no PFM context\n",
+ task_pid_nr(current));
return;
}
PFM_SET_WORK_PENDING(current, 0);
- tsk_clear_notify_resume(current);
-
regs = task_pt_regs(current);
/*
/*
* must be done before we check for simple-reset mode
*/
- if (ctx->ctx_fl_going_zombie || ctx->ctx_state == PFM_CTX_ZOMBIE) goto do_zombie;
-
+ if (ctx->ctx_fl_going_zombie || ctx->ctx_state == PFM_CTX_ZOMBIE)
+ goto do_zombie;
//if (CTX_OVFL_NOBLOCK(ctx)) goto skip_blocking;
- if (reason == PFM_TRAP_REASON_RESET) goto skip_blocking;
+ if (reason == PFM_TRAP_REASON_RESET)
+ goto skip_blocking;
/*
* restore interrupt mask to what it was on entry.
/*
* in case of interruption of down() we don't restart anything
*/
- if (ret < 0) goto nothing_to_do;
+ if (ret < 0)
+ goto nothing_to_do;
skip_blocking:
pfm_resume_after_ovfl(ctx, ovfl_regs, regs);
* main overflow processing routine.
* it can be called from the interrupt path or explicitly during the context switch code
*/
-static void
-pfm_overflow_handler(struct task_struct *task, pfm_context_t *ctx, u64 pmc0, struct pt_regs *regs)
+static void pfm_overflow_handler(struct task_struct *task, pfm_context_t *ctx,
+ unsigned long pmc0, struct pt_regs *regs)
{
pfm_ovfl_arg_t *ovfl_arg;
unsigned long mask;
* when coming from ctxsw, current still points to the
* previous task, therefore we must work with task and not current.
*/
- tsk_set_notify_resume(task);
+ set_notify_resume(task);
}
/*
* defer until state is changed (shorten spin window). the context is locked
(*pfm_alt_intr_handler->handler)(irq, arg, regs);
}
- put_cpu_no_resched();
+ put_cpu();
return IRQ_HANDLED;
}
* /proc/perfmon interface, for debug only
*/
-#define PFM_PROC_SHOW_HEADER ((void *)NR_CPUS+1)
+#define PFM_PROC_SHOW_HEADER ((void *)(long)nr_cpu_ids+1)
static void *
pfm_proc_start(struct seq_file *m, loff_t *pos)
return PFM_PROC_SHOW_HEADER;
}
- while (*pos <= NR_CPUS) {
+ while (*pos <= nr_cpu_ids) {
if (cpu_online(*pos - 1)) {
return (void *)*pos;
}
}
/* save the current system wide pmu states */
- ret = on_each_cpu(pfm_alt_save_pmu_state, NULL, 0, 1);
+ ret = on_each_cpu(pfm_alt_save_pmu_state, NULL, 1);
if (ret) {
DPRINT(("on_each_cpu() failed: %d\n", ret));
goto cleanup_reserve;
pfm_alt_intr_handler = NULL;
- ret = on_each_cpu(pfm_alt_restore_pmu_state, NULL, 0, 1);
+ ret = on_each_cpu(pfm_alt_restore_pmu_state, NULL, 1);
if (ret) {
DPRINT(("on_each_cpu() failed: %d\n", ret));
}
/*
* create /proc/perfmon (mostly for debugging purposes)
*/
- perfmon_dir = create_proc_entry("perfmon", S_IRUGO, NULL);
+ perfmon_dir = proc_create("perfmon", S_IRUGO, NULL, &pfm_proc_fops);
if (perfmon_dir == NULL) {
printk(KERN_ERR "perfmon: cannot create /proc entry, perfmon disabled\n");
pmu_conf = NULL;
return -1;
}
- /*
- * install customized file operations for /proc/perfmon entry
- */
- perfmon_dir->proc_fops = &pfm_proc_fops;
/*
* create /proc/sys/kernel/perfmon (for debugging purposes)
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff