--- /dev/null
+/*
+ * 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/wait.h>
+#include <asm/io.h>
+#include <asm/sibyte/sb1250.h>
+
+#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
+#include <asm/sibyte/bcm1480_regs.h>
+#include <asm/sibyte/bcm1480_scd.h>
+#include <asm/sibyte/bcm1480_int.h>
+#elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
+#include <asm/sibyte/sb1250_regs.h>
+#include <asm/sibyte/sb1250_scd.h>
+#include <asm/sibyte/sb1250_int.h>
+#else
+#error invalid SiByte UART configuation
+#endif
+
+#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
+#undef K_INT_TRACE_FREEZE
+#define K_INT_TRACE_FREEZE K_BCM1480_INT_TRACE_FREEZE
+#undef K_INT_PERF_CNT
+#define K_INT_PERF_CNT K_BCM1480_INT_PERF_CNT
+#endif
+
+#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 "sb_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.
+ */
+#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
+ __raw_writeq((scdperfcnt & ~M_SPC_CFG_SRC1) |
+ /* keep counters 0,2,3,4,5,6,7 as is */
+ V_SPC_CFG_SRC1(1), /* counter 1 counts cycles */
+ IOADDR(A_BCM1480_SCD_PERF_CNT_CFG0));
+ __raw_writeq(
+ M_SPC_CFG_ENABLE | /* enable counting */
+ M_SPC_CFG_CLEAR | /* clear all counters */
+ V_SPC_CFG_SRC1(1), /* counter 1 counts cycles */
+ IOADDR(A_BCM1480_SCD_PERF_CNT_CFG1));
+#else
+ __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));
+#endif
+ __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_interruptible(&sbp.tb_sync);
+ } else {
+ /* knock down current interrupt and get another one later */
+ arm_tb();
+ }
+ } 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_interruptible(&sbp.tb_sync);
+ wake_up_interruptible(&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)
+ */
+ 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
+ */
+#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
+ __raw_writeq(K_BCM1480_INT_MAP_I3,
+ IOADDR(A_BCM1480_IMR_REGISTER(0, R_BCM1480_IMR_INTERRUPT_MAP_BASE_L) +
+ ((K_BCM1480_INT_PERF_CNT & 0x3f) << 3)));
+#else
+ __raw_writeq(K_INT_MAP_I3,
+ IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MAP_BASE) +
+ (K_INT_PERF_CNT << 3)));
+#endif
+
+ /* 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 */
+#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
+ __raw_writeq(1ULL << (K_BCM1480_INT_PERF_CNT & 0x3f),
+ IOADDR(A_BCM1480_IMR_REGISTER(0, R_BCM1480_IMR_INTERRUPT_TRACE_L)));
+#else
+ __raw_writeq(1ULL << K_INT_PERF_CNT,
+ IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_TRACE)));
+#endif
+ arm_tb();
+
+ pr_debug(DEVNAME ": done starting\n");
+
+ return 0;
+}
+
+static int sbprof_zbprof_stop(void)
+{
+ int err = 0;
+
+ 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 err;
+}
+
+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;
+
+ 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;
+ char *src;
+ int count = 0;
+ char *dest = buf;
+ long cur_off = *offp;
+
+ 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 err = 0;
+
+ switch (command) {
+ case SBPROF_ZBSTART:
+ mutex_lock(&sbp.lock);
+ err = sbprof_zbprof_start(filp);
+ mutex_unlock(&sbp.lock);
+ break;
+
+ case SBPROF_ZBSTOP:
+ mutex_lock(&sbp.lock);
+ err = sbprof_zbprof_stop();
+ mutex_unlock(&sbp.lock);
+ break;
+
+ case SBPROF_ZBWAITFULL: {
+ err = wait_event_interruptible(sbp.tb_read, TB_FULL);
+ if (err)
+ break;
+
+ err = put_user(TB_FULL, (int *) arg);
+ break;
+ }
+
+ default:
+ err = -EINVAL;
+ break;
+ }
+
+ return err;
+}
+
+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",
+ (long long) 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");
+++ /dev/null
-/*
- * 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");
projects / linux-2.6-microblaze.git / commitdiff