diff options
Diffstat (limited to 'arch/s390')
-rw-r--r-- | arch/s390/oprofile/Makefile | 2 | ||||
-rw-r--r-- | arch/s390/oprofile/hwsampler_files.c | 146 | ||||
-rw-r--r-- | arch/s390/oprofile/init.c | 7 |
3 files changed, 153 insertions, 2 deletions
diff --git a/arch/s390/oprofile/Makefile b/arch/s390/oprofile/Makefile index d698cdd..00d8fc8 100644 --- a/arch/s390/oprofile/Makefile +++ b/arch/s390/oprofile/Makefile @@ -6,4 +6,4 @@ DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \ oprofilefs.o oprofile_stats.o \ timer_int.o ) -oprofile-y := $(DRIVER_OBJS) init.o backtrace.o hwsampler.o +oprofile-y := $(DRIVER_OBJS) init.o backtrace.o hwsampler.o hwsampler_files.o diff --git a/arch/s390/oprofile/hwsampler_files.c b/arch/s390/oprofile/hwsampler_files.c new file mode 100644 index 0000000..493f7cc --- /dev/null +++ b/arch/s390/oprofile/hwsampler_files.c @@ -0,0 +1,146 @@ +/** + * arch/s390/oprofile/hwsampler_files.c + * + * Copyright IBM Corp. 2010 + * Author: Mahesh Salgaonkar (mahesh@linux.vnet.ibm.com) + */ +#include <linux/oprofile.h> +#include <linux/errno.h> +#include <linux/fs.h> + +#include "hwsampler.h" + +#define DEFAULT_INTERVAL 4096 + +#define DEFAULT_SDBT_BLOCKS 1 +#define DEFAULT_SDB_BLOCKS 511 + +static unsigned long oprofile_hw_interval = DEFAULT_INTERVAL; +static unsigned long oprofile_min_interval; +static unsigned long oprofile_max_interval; + +static unsigned long oprofile_sdbt_blocks = DEFAULT_SDBT_BLOCKS; +static unsigned long oprofile_sdb_blocks = DEFAULT_SDB_BLOCKS; + +static unsigned long oprofile_hwsampler; + +static int oprofile_hwsampler_start(void) +{ + int retval; + + retval = hwsampler_allocate(oprofile_sdbt_blocks, oprofile_sdb_blocks); + if (retval) + return retval; + + retval = hwsampler_start_all(oprofile_hw_interval); + if (retval) + hwsampler_deallocate(); + + return retval; +} + +static void oprofile_hwsampler_stop(void) +{ + hwsampler_stop_all(); + hwsampler_deallocate(); + return; +} + +int oprofile_arch_set_hwsampler(struct oprofile_operations *ops) +{ + printk(KERN_INFO "oprofile: using hardware sampling\n"); + ops->start = oprofile_hwsampler_start; + ops->stop = oprofile_hwsampler_stop; + ops->cpu_type = "timer"; + + return 0; +} + +static ssize_t hwsampler_read(struct file *file, char __user *buf, + size_t count, loff_t *offset) +{ + return oprofilefs_ulong_to_user(oprofile_hwsampler, buf, count, offset); +} + +static ssize_t hwsampler_write(struct file *file, char const __user *buf, + size_t count, loff_t *offset) +{ + unsigned long val; + int retval; + + if (*offset) + return -EINVAL; + + retval = oprofilefs_ulong_from_user(&val, buf, count); + if (retval) + return retval; + + if (oprofile_hwsampler == val) + return -EINVAL; + + retval = oprofile_set_hwsampler(val); + + if (retval) + return retval; + + oprofile_hwsampler = val; + return count; +} + +static const struct file_operations hwsampler_fops = { + .read = hwsampler_read, + .write = hwsampler_write, +}; + +static int oprofile_create_hwsampling_files(struct super_block *sb, + struct dentry *root) +{ + struct dentry *hw_dir; + + /* reinitialize default values */ + oprofile_hwsampler = 1; + + hw_dir = oprofilefs_mkdir(sb, root, "hwsampling"); + if (!hw_dir) + return -EINVAL; + + oprofilefs_create_file(sb, hw_dir, "hwsampler", &hwsampler_fops); + oprofilefs_create_ulong(sb, hw_dir, "hw_interval", + &oprofile_hw_interval); + oprofilefs_create_ro_ulong(sb, hw_dir, "hw_min_interval", + &oprofile_min_interval); + oprofilefs_create_ro_ulong(sb, hw_dir, "hw_max_interval", + &oprofile_max_interval); + oprofilefs_create_ulong(sb, hw_dir, "hw_sdbt_blocks", + &oprofile_sdbt_blocks); + + return 0; +} + +int oprofile_hwsampler_init(struct oprofile_operations* ops) +{ + if (hwsampler_setup()) + return -ENODEV; + + /* + * create hwsampler files only if hwsampler_setup() succeeds. + */ + ops->create_files = oprofile_create_hwsampling_files; + oprofile_min_interval = hwsampler_query_min_interval(); + if (oprofile_min_interval < 0) { + oprofile_min_interval = 0; + return -ENODEV; + } + oprofile_max_interval = hwsampler_query_max_interval(); + if (oprofile_max_interval < 0) { + oprofile_max_interval = 0; + return -ENODEV; + } + oprofile_arch_set_hwsampler(ops); + return 0; +} + +void oprofile_hwsampler_exit(void) +{ + hwsampler_shutdown(); +} diff --git a/arch/s390/oprofile/init.c b/arch/s390/oprofile/init.c index 7a99511..f6b3f72 100644 --- a/arch/s390/oprofile/init.c +++ b/arch/s390/oprofile/init.c @@ -11,16 +11,21 @@ #include <linux/oprofile.h> #include <linux/init.h> #include <linux/errno.h> +#include <linux/fs.h> +extern int oprofile_hwsampler_init(struct oprofile_operations* ops); +extern void oprofile_hwsampler_exit(void); extern void s390_backtrace(struct pt_regs * const regs, unsigned int depth); int __init oprofile_arch_init(struct oprofile_operations* ops) { ops->backtrace = s390_backtrace; - return -ENODEV; + + return oprofile_hwsampler_init(ops); } void oprofile_arch_exit(void) { + oprofile_hwsampler_exit(); } |