diff options
Diffstat (limited to 'arch/mips/sibyte/sb1250/bcm1250_tbprof.c')
| -rw-r--r-- | arch/mips/sibyte/sb1250/bcm1250_tbprof.c | 406 |
1 files changed, 0 insertions, 406 deletions
diff --git a/arch/mips/sibyte/sb1250/bcm1250_tbprof.c b/arch/mips/sibyte/sb1250/bcm1250_tbprof.c deleted file mode 100644 index 212547c57310..000000000000 --- a/arch/mips/sibyte/sb1250/bcm1250_tbprof.c +++ /dev/null @@ -1,406 +0,0 @@ -/* - * Copyright (C) 2001, 2002, 2003 Broadcom Corporation - * - * 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. - */ - -#define SBPROF_TB_DEBUG 0 - -#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/reboot.h> -#include <linux/smp_lock.h> -#include <linux/wait.h> -#include <asm/uaccess.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/sibyte/trace_prof.h> - -#define DEVNAME "bcm1250_tbprof" - -static struct sbprof_tb sbp; - -#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 u_int64_t tb_period; - -static void arm_tb(void) -{ - u_int64_t scdperfcnt; - u_int64_t next = (1ULL << 40) - tb_period; - u_int64_t 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; - DBG(printk(DEVNAME ": tb_intr\n")); - if (sbp.next_tb_sample < MAX_TB_SAMPLES) { - /* XXX should use XKPHYS to make writes bypass L2 */ - u_int64_t *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) { - DBG(printk(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 */ - DBG(printk(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; -} - -int sbprof_zbprof_start(struct file *filp) -{ - u_int64_t scdperfcnt; - - if (sbp.tb_enable) - return -EBUSY; - - DBG(printk(DEVNAME ": starting\n")); - - sbp.tb_enable = 1; - sbp.next_tb_sample = 0; - filp->f_pos = 0; - - if (request_irq - (K_INT_TRACE_FREEZE, sbprof_tb_intr, 0, DEVNAME " trace freeze", &sbp)) { - 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) */ - if (request_irq - (K_INT_PERF_CNT, sbprof_pc_intr, 0, DEVNAME " scd perfcnt", &sbp)) { - free_irq(K_INT_TRACE_FREEZE, &sbp); - return -EBUSY; - } - - /* 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(); - - DBG(printk(DEVNAME ": done starting\n")); - - return 0; -} - -int sbprof_zbprof_stop(void) -{ - DEFINE_WAIT(wait); - DBG(printk(DEVNAME ": stopping\n")); - - if (sbp.tb_enable) { - sbp.tb_enable = 0; - /* XXXKW there is a window here where the intr handler - may run, see the disable, and do the wake_up before - this sleep happens. */ - if (sbp.tb_armed) { - DBG(printk(DEVNAME ": wait for disarm\n")); - prepare_to_wait(&sbp.tb_sync, &wait, TASK_INTERRUPTIBLE); - schedule(); - finish_wait(&sbp.tb_sync, &wait); - DBG(printk(DEVNAME ": disarm complete\n")); - } - free_irq(K_INT_TRACE_FREEZE, &sbp); - free_irq(K_INT_PERF_CNT, &sbp); - } - - DBG(printk(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 (sbp.open) { - 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); - sbp.open = 1; - - return 0; -} - -static int sbprof_tb_release(struct inode *inode, struct file *filp) -{ - int minor; - - minor = iminor(inode); - if (minor != 0 || !sbp.open) { - return -ENODEV; - } - - if (sbp.tb_armed || sbp.tb_enable) { - sbprof_zbprof_stop(); - } - - vfree(sbp.sbprof_tbbuf); - sbp.open = 0; - - 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; - char *src; - int count = 0; - char *dest = buf; - long cur_off = *offp; - - 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)) { - cur_count = size < sample_left ? size : sample_left; - src = (char *)(((long)sbp.sbprof_tbbuf[cur_sample])+sample_off); - copy_to_user(dest, src, cur_count); - DBG(printk(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; - - return count; -} - -static long sbprof_tb_ioctl(struct file *filp, - unsigned int command, - unsigned long arg) -{ - int error = 0; - - lock_kernel(); - switch (command) { - case SBPROF_ZBSTART: - error = sbprof_zbprof_start(filp); - break; - case SBPROF_ZBSTOP: - error = sbprof_zbprof_stop(); - break; - case SBPROF_ZBWAITFULL: - DEFINE_WAIT(wait); - prepare_to_wait(&sbp.tb_read, &wait, TASK_INTERRUPTIBLE); - schedule(); - finish_wait(&sbp.tb_read, &wait); - /* XXXKW check if interrupted? */ - return put_user(TB_FULL, (int *) arg); - default: - error = -EINVAL; - break; - } - unlock_kernel(); - - 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 int __init sbprof_tb_init(void) -{ - if (register_chrdev(SBPROF_TB_MAJOR, DEVNAME, &sbprof_tb_fops)) { - printk(KERN_WARNING DEVNAME ": initialization failed (dev %d)\n", - SBPROF_TB_MAJOR); - return -EIO; - } - sbp.open = 0; - tb_period = zbbus_mhz * 10000LL; - printk(KERN_INFO DEVNAME ": initialized - tb_period = %lld\n", tb_period); - return 0; -} - -static void __exit sbprof_tb_cleanup(void) -{ - unregister_chrdev(SBPROF_TB_MAJOR, DEVNAME); -} - -module_init(sbprof_tb_init); -module_exit(sbprof_tb_cleanup); |