diff options
Diffstat (limited to 'arch/mips/sibyte/sb1250/bcm1250_tbprof.c')
| -rw-r--r-- | arch/mips/sibyte/sb1250/bcm1250_tbprof.c | 571 |
1 files changed, 0 insertions, 571 deletions
diff --git a/arch/mips/sibyte/sb1250/bcm1250_tbprof.c b/arch/mips/sibyte/sb1250/bcm1250_tbprof.c deleted file mode 100644 index ea0ca131a3cf..000000000000 --- a/arch/mips/sibyte/sb1250/bcm1250_tbprof.c +++ /dev/null @@ -1,571 +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) 2001, 2002, 2003 Broadcom Corporation - * Copyright (C) 2007 Ralf Baechle <ralf@linux-mips.org> - * Copyright (C) 2007 MIPS Technologies, Inc. - * written by Ralf Baechle <ralf@linux-mips.org> - */ - -#undef DEBUG - -#include <linux/device.h> -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/types.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/slab.h> -#include <linux/vmalloc.h> -#include <linux/fs.h> -#include <linux/errno.h> -#include <linux/types.h> -#include <linux/wait.h> - -#include <asm/io.h> -#include <asm/sibyte/sb1250.h> -#include <asm/sibyte/sb1250_regs.h> -#include <asm/sibyte/sb1250_scd.h> -#include <asm/sibyte/sb1250_int.h> -#include <asm/system.h> -#include <asm/uaccess.h> - -#define SBPROF_TB_MAJOR 240 - -typedef u64 tb_sample_t[6*256]; - -enum open_status { - SB_CLOSED, - SB_OPENING, - SB_OPEN -}; - -struct sbprof_tb { - wait_queue_head_t tb_sync; - wait_queue_head_t tb_read; - struct mutex lock; - enum open_status open; - tb_sample_t *sbprof_tbbuf; - int next_tb_sample; - - volatile int tb_enable; - volatile int tb_armed; - -}; - -static struct sbprof_tb sbp; - -#define MAX_SAMPLE_BYTES (24*1024*1024) -#define MAX_TBSAMPLE_BYTES (12*1024*1024) - -#define MAX_SAMPLES (MAX_SAMPLE_BYTES/sizeof(u_int32_t)) -#define TB_SAMPLE_SIZE (sizeof(tb_sample_t)) -#define MAX_TB_SAMPLES (MAX_TBSAMPLE_BYTES/TB_SAMPLE_SIZE) - -/* ioctls */ -#define SBPROF_ZBSTART _IOW('s', 0, int) -#define SBPROF_ZBSTOP _IOW('s', 1, int) -#define SBPROF_ZBWAITFULL _IOW('s', 2, int) - -/* - * Routines for using 40-bit SCD cycle counter - * - * Client responsible for either handling interrupts or making sure - * the cycles counter never saturates, e.g., by doing - * zclk_timer_init(0) at least every 2^40 - 1 ZCLKs. - */ - -/* - * Configures SCD counter 0 to count ZCLKs starting from val; - * Configures SCD counters1,2,3 to count nothing. - * Must not be called while gathering ZBbus profiles. - */ - -#define zclk_timer_init(val) \ - __asm__ __volatile__ (".set push;" \ - ".set mips64;" \ - "la $8, 0xb00204c0;" /* SCD perf_cnt_cfg */ \ - "sd %0, 0x10($8);" /* write val to counter0 */ \ - "sd %1, 0($8);" /* config counter0 for zclks*/ \ - ".set pop" \ - : /* no outputs */ \ - /* enable, counter0 */ \ - : /* inputs */ "r"(val), "r" ((1ULL << 33) | 1ULL) \ - : /* modifies */ "$8" ) - - -/* Reads SCD counter 0 and puts result in value - unsigned long long val; */ -#define zclk_get(val) \ - __asm__ __volatile__ (".set push;" \ - ".set mips64;" \ - "la $8, 0xb00204c0;" /* SCD perf_cnt_cfg */ \ - "ld %0, 0x10($8);" /* write val to counter0 */ \ - ".set pop" \ - : /* outputs */ "=r"(val) \ - : /* inputs */ \ - : /* modifies */ "$8" ) - -#define DEVNAME "bcm1250_tbprof" - -#define TB_FULL (sbp.next_tb_sample == MAX_TB_SAMPLES) - -/* - * Support for ZBbus sampling using the trace buffer - * - * We use the SCD performance counter interrupt, caused by a Zclk counter - * overflow, to trigger the start of tracing. - * - * We set the trace buffer to sample everything and freeze on - * overflow. - * - * We map the interrupt for trace_buffer_freeze to handle it on CPU 0. - */ - -static u64 tb_period; - -static void arm_tb(void) -{ - u64 scdperfcnt; - u64 next = (1ULL << 40) - tb_period; - u64 tb_options = M_SCD_TRACE_CFG_FREEZE_FULL; - - /* - * Generate an SCD_PERFCNT interrupt in TB_PERIOD Zclks to trigger - *start of trace. XXX vary sampling period - */ - __raw_writeq(0, IOADDR(A_SCD_PERF_CNT_1)); - scdperfcnt = __raw_readq(IOADDR(A_SCD_PERF_CNT_CFG)); - - /* - * Unfortunately, in Pass 2 we must clear all counters to knock down a - * previous interrupt request. This means that bus profiling requires - * ALL of the SCD perf counters. - */ - __raw_writeq((scdperfcnt & ~M_SPC_CFG_SRC1) | - /* keep counters 0,2,3 as is */ - M_SPC_CFG_ENABLE | /* enable counting */ - M_SPC_CFG_CLEAR | /* clear all counters */ - V_SPC_CFG_SRC1(1), /* counter 1 counts cycles */ - IOADDR(A_SCD_PERF_CNT_CFG)); - __raw_writeq(next, IOADDR(A_SCD_PERF_CNT_1)); - - /* Reset the trace buffer */ - __raw_writeq(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG)); -#if 0 && defined(M_SCD_TRACE_CFG_FORCECNT) - /* XXXKW may want to expose control to the data-collector */ - tb_options |= M_SCD_TRACE_CFG_FORCECNT; -#endif - __raw_writeq(tb_options, IOADDR(A_SCD_TRACE_CFG)); - sbp.tb_armed = 1; -} - -static irqreturn_t sbprof_tb_intr(int irq, void *dev_id) -{ - int i; - - pr_debug(DEVNAME ": tb_intr\n"); - - if (sbp.next_tb_sample < MAX_TB_SAMPLES) { - /* XXX should use XKPHYS to make writes bypass L2 */ - u64 *p = sbp.sbprof_tbbuf[sbp.next_tb_sample++]; - /* Read out trace */ - __raw_writeq(M_SCD_TRACE_CFG_START_READ, - IOADDR(A_SCD_TRACE_CFG)); - __asm__ __volatile__ ("sync" : : : "memory"); - /* Loop runs backwards because bundles are read out in reverse order */ - for (i = 256 * 6; i > 0; i -= 6) { - /* Subscripts decrease to put bundle in the order */ - /* t0 lo, t0 hi, t1 lo, t1 hi, t2 lo, t2 hi */ - p[i - 1] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); - /* read t2 hi */ - p[i - 2] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); - /* read t2 lo */ - p[i - 3] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); - /* read t1 hi */ - p[i - 4] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); - /* read t1 lo */ - p[i - 5] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); - /* read t0 hi */ - p[i - 6] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); - /* read t0 lo */ - } - if (!sbp.tb_enable) { - pr_debug(DEVNAME ": tb_intr shutdown\n"); - __raw_writeq(M_SCD_TRACE_CFG_RESET, - IOADDR(A_SCD_TRACE_CFG)); - sbp.tb_armed = 0; - wake_up(&sbp.tb_sync); - } else { - arm_tb(); /* knock down current interrupt and get another one later */ - } - } else { - /* No more trace buffer samples */ - pr_debug(DEVNAME ": tb_intr full\n"); - __raw_writeq(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG)); - sbp.tb_armed = 0; - if (!sbp.tb_enable) { - wake_up(&sbp.tb_sync); - } - wake_up(&sbp.tb_read); - } - - return IRQ_HANDLED; -} - -static irqreturn_t sbprof_pc_intr(int irq, void *dev_id) -{ - printk(DEVNAME ": unexpected pc_intr"); - return IRQ_NONE; -} - -/* - * Requires: Already called zclk_timer_init with a value that won't - * saturate 40 bits. No subsequent use of SCD performance counters - * or trace buffer. - */ - -static int sbprof_zbprof_start(struct file *filp) -{ - u64 scdperfcnt; - int err; - - if (xchg(&sbp.tb_enable, 1)) - return -EBUSY; - - pr_debug(DEVNAME ": starting\n"); - - sbp.next_tb_sample = 0; - filp->f_pos = 0; - - err = request_irq(K_INT_TRACE_FREEZE, sbprof_tb_intr, 0, - DEVNAME " trace freeze", &sbp); - if (err) - return -EBUSY; - - /* Make sure there isn't a perf-cnt interrupt waiting */ - scdperfcnt = __raw_readq(IOADDR(A_SCD_PERF_CNT_CFG)); - /* Disable and clear counters, override SRC_1 */ - __raw_writeq((scdperfcnt & ~(M_SPC_CFG_SRC1 | M_SPC_CFG_ENABLE)) | - M_SPC_CFG_ENABLE | M_SPC_CFG_CLEAR | V_SPC_CFG_SRC1(1), - IOADDR(A_SCD_PERF_CNT_CFG)); - - /* - * We grab this interrupt to prevent others from trying to use it, even - * though we don't want to service the interrupts (they only feed into - * the trace-on-interrupt mechanism) - */ - err = request_irq(K_INT_PERF_CNT, sbprof_pc_intr, 0, - DEVNAME " scd perfcnt", &sbp); - if (err) - goto out_free_irq; - - /* - * I need the core to mask these, but the interrupt mapper to pass them - * through. I am exploiting my knowledge that cp0_status masks out - * IP[5]. krw - */ - __raw_writeq(K_INT_MAP_I3, - IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MAP_BASE) + - (K_INT_PERF_CNT << 3))); - - /* Initialize address traps */ - __raw_writeq(0, IOADDR(A_ADDR_TRAP_UP_0)); - __raw_writeq(0, IOADDR(A_ADDR_TRAP_UP_1)); - __raw_writeq(0, IOADDR(A_ADDR_TRAP_UP_2)); - __raw_writeq(0, IOADDR(A_ADDR_TRAP_UP_3)); - - __raw_writeq(0, IOADDR(A_ADDR_TRAP_DOWN_0)); - __raw_writeq(0, IOADDR(A_ADDR_TRAP_DOWN_1)); - __raw_writeq(0, IOADDR(A_ADDR_TRAP_DOWN_2)); - __raw_writeq(0, IOADDR(A_ADDR_TRAP_DOWN_3)); - - __raw_writeq(0, IOADDR(A_ADDR_TRAP_CFG_0)); - __raw_writeq(0, IOADDR(A_ADDR_TRAP_CFG_1)); - __raw_writeq(0, IOADDR(A_ADDR_TRAP_CFG_2)); - __raw_writeq(0, IOADDR(A_ADDR_TRAP_CFG_3)); - - /* Initialize Trace Event 0-7 */ - /* when interrupt */ - __raw_writeq(M_SCD_TREVT_INTERRUPT, IOADDR(A_SCD_TRACE_EVENT_0)); - __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_1)); - __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_2)); - __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_3)); - __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_4)); - __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_5)); - __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_6)); - __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_7)); - - /* Initialize Trace Sequence 0-7 */ - /* Start on event 0 (interrupt) */ - __raw_writeq(V_SCD_TRSEQ_FUNC_START | 0x0fff, - IOADDR(A_SCD_TRACE_SEQUENCE_0)); - /* dsamp when d used | asamp when a used */ - __raw_writeq(M_SCD_TRSEQ_ASAMPLE | M_SCD_TRSEQ_DSAMPLE | - K_SCD_TRSEQ_TRIGGER_ALL, - IOADDR(A_SCD_TRACE_SEQUENCE_1)); - __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_2)); - __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_3)); - __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_4)); - __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_5)); - __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_6)); - __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_7)); - - /* Now indicate the PERF_CNT interrupt as a trace-relevant interrupt */ - __raw_writeq(1ULL << K_INT_PERF_CNT, - IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_TRACE))); - - arm_tb(); - - pr_debug(DEVNAME ": done starting\n"); - - return 0; - -out_free_irq: - free_irq(K_INT_TRACE_FREEZE, &sbp); - - return err; -} - -static int sbprof_zbprof_stop(void) -{ - int err; - - pr_debug(DEVNAME ": stopping\n"); - - if (sbp.tb_enable) { - /* - * XXXKW there is a window here where the intr handler may run, - * see the disable, and do the wake_up before this sleep - * happens. - */ - pr_debug(DEVNAME ": wait for disarm\n"); - err = wait_event_interruptible(sbp.tb_sync, !sbp.tb_armed); - pr_debug(DEVNAME ": disarm complete, stat %d\n", err); - - if (err) - return err; - - sbp.tb_enable = 0; - free_irq(K_INT_TRACE_FREEZE, &sbp); - free_irq(K_INT_PERF_CNT, &sbp); - } - - pr_debug(DEVNAME ": done stopping\n"); - - return 0; -} - -static int sbprof_tb_open(struct inode *inode, struct file *filp) -{ - int minor; - - minor = iminor(inode); - if (minor != 0) - return -ENODEV; - - if (xchg(&sbp.open, SB_OPENING) != SB_CLOSED) - return -EBUSY; - - memset(&sbp, 0, sizeof(struct sbprof_tb)); - - sbp.sbprof_tbbuf = vmalloc(MAX_TBSAMPLE_BYTES); - if (!sbp.sbprof_tbbuf) - return -ENOMEM; - - memset(sbp.sbprof_tbbuf, 0, MAX_TBSAMPLE_BYTES); - init_waitqueue_head(&sbp.tb_sync); - init_waitqueue_head(&sbp.tb_read); - mutex_init(&sbp.lock); - - sbp.open = SB_OPEN; - - return 0; -} - -static int sbprof_tb_release(struct inode *inode, struct file *filp) -{ - int minor = iminor(inode); - - if (minor != 0 || !sbp.open) - return -ENODEV; - - mutex_lock(&sbp.lock); - - if (sbp.tb_armed || sbp.tb_enable) - sbprof_zbprof_stop(); - - vfree(sbp.sbprof_tbbuf); - sbp.open = 0; - - mutex_unlock(&sbp.lock); - - return 0; -} - -static ssize_t sbprof_tb_read(struct file *filp, char *buf, - size_t size, loff_t *offp) -{ - int cur_sample, sample_off, cur_count, sample_left; - long cur_off = *offp; - char *dest = buf; - int count = 0; - char *src; - - if (!access_ok(VERIFY_WRITE, buf, size)) - return -EFAULT; - - mutex_lock(&sbp.lock); - - count = 0; - cur_sample = cur_off / TB_SAMPLE_SIZE; - sample_off = cur_off % TB_SAMPLE_SIZE; - sample_left = TB_SAMPLE_SIZE - sample_off; - - while (size && (cur_sample < sbp.next_tb_sample)) { - int err; - - cur_count = size < sample_left ? size : sample_left; - src = (char *)(((long)sbp.sbprof_tbbuf[cur_sample])+sample_off); - err = __copy_to_user(dest, src, cur_count); - if (err) { - *offp = cur_off + cur_count - err; - mutex_unlock(&sbp.lock); - return err; - } - - pr_debug(DEVNAME ": read from sample %d, %d bytes\n", - cur_sample, cur_count); - size -= cur_count; - sample_left -= cur_count; - if (!sample_left) { - cur_sample++; - sample_off = 0; - sample_left = TB_SAMPLE_SIZE; - } else { - sample_off += cur_count; - } - cur_off += cur_count; - dest += cur_count; - count += cur_count; - } - - *offp = cur_off; - mutex_unlock(&sbp.lock); - - return count; -} - -static long sbprof_tb_ioctl(struct file *filp, unsigned int command, - unsigned long arg) -{ - int error = 0; - - switch (command) { - case SBPROF_ZBSTART: - mutex_lock(&sbp.lock); - error = sbprof_zbprof_start(filp); - mutex_unlock(&sbp.lock); - break; - - case SBPROF_ZBSTOP: - mutex_lock(&sbp.lock); - error = sbprof_zbprof_stop(); - mutex_unlock(&sbp.lock); - break; - - case SBPROF_ZBWAITFULL: - error = wait_event_interruptible(sbp.tb_read, TB_FULL); - if (error) - break; - - error = put_user(TB_FULL, (int *) arg); - break; - - default: - error = -EINVAL; - break; - } - - return error; -} - -static const struct file_operations sbprof_tb_fops = { - .owner = THIS_MODULE, - .open = sbprof_tb_open, - .release = sbprof_tb_release, - .read = sbprof_tb_read, - .unlocked_ioctl = sbprof_tb_ioctl, - .compat_ioctl = sbprof_tb_ioctl, - .mmap = NULL, -}; - -static struct class *tb_class; -static struct device *tb_dev; - -static int __init sbprof_tb_init(void) -{ - struct device *dev; - struct class *tbc; - int err; - - if (register_chrdev(SBPROF_TB_MAJOR, DEVNAME, &sbprof_tb_fops)) { - printk(KERN_WARNING DEVNAME ": initialization failed (dev %d)\n", - SBPROF_TB_MAJOR); - return -EIO; - } - - tbc = class_create(THIS_MODULE, "sb_tracebuffer"); - if (IS_ERR(tbc)) { - err = PTR_ERR(tbc); - goto out_chrdev; - } - - tb_class = tbc; - - dev = device_create(tbc, NULL, MKDEV(SBPROF_TB_MAJOR, 0), "tb"); - if (IS_ERR(dev)) { - err = PTR_ERR(dev); - goto out_class; - } - tb_dev = dev; - - sbp.open = 0; - tb_period = zbbus_mhz * 10000LL; - pr_info(DEVNAME ": initialized - tb_period = %lld\n", tb_period); - - return 0; - -out_class: - class_destroy(tb_class); -out_chrdev: - unregister_chrdev(SBPROF_TB_MAJOR, DEVNAME); - - return err; -} - -static void __exit sbprof_tb_cleanup(void) -{ - device_destroy(tb_class, MKDEV(SBPROF_TB_MAJOR, 0)); - unregister_chrdev(SBPROF_TB_MAJOR, DEVNAME); - class_destroy(tb_class); -} - -module_init(sbprof_tb_init); -module_exit(sbprof_tb_cleanup); - -MODULE_ALIAS_CHARDEV_MAJOR(SBPROF_TB_MAJOR); -MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>"); -MODULE_LICENSE("GPL"); |