2 * Copyright (C) 2001, 2002, 2003 Broadcom Corporation
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 #define SBPROF_TB_DEBUG 0
21 #include <linux/module.h>
22 #include <linux/kernel.h>
23 #include <linux/types.h>
24 #include <linux/init.h>
25 #include <linux/interrupt.h>
26 #include <linux/slab.h>
27 #include <linux/vmalloc.h>
29 #include <linux/errno.h>
30 #include <linux/reboot.h>
31 #include <asm/uaccess.h>
33 #include <asm/sibyte/sb1250.h>
34 #include <asm/sibyte/sb1250_regs.h>
35 #include <asm/sibyte/sb1250_scd.h>
36 #include <asm/sibyte/sb1250_int.h>
37 #include <asm/sibyte/trace_prof.h>
39 #define DEVNAME "bcm1250_tbprof"
41 static struct sbprof_tb sbp;
43 #define TB_FULL (sbp.next_tb_sample == MAX_TB_SAMPLES)
45 /************************************************************************
46 * Support for ZBbus sampling using the trace buffer
48 * We use the SCD performance counter interrupt, caused by a Zclk counter
49 * overflow, to trigger the start of tracing.
51 * We set the trace buffer to sample everything and freeze on
54 * We map the interrupt for trace_buffer_freeze to handle it on CPU 0.
56 ************************************************************************/
58 static u_int64_t tb_period;
60 static void arm_tb(void)
63 u_int64_t next = (1ULL << 40) - tb_period;
64 u_int64_t tb_options = M_SCD_TRACE_CFG_FREEZE_FULL;
65 /* Generate an SCD_PERFCNT interrupt in TB_PERIOD Zclks to
66 trigger start of trace. XXX vary sampling period */
67 __raw_writeq(0, IOADDR(A_SCD_PERF_CNT_1));
68 scdperfcnt = __raw_readq(IOADDR(A_SCD_PERF_CNT_CFG));
69 /* Unfortunately, in Pass 2 we must clear all counters to knock down
70 a previous interrupt request. This means that bus profiling
71 requires ALL of the SCD perf counters. */
72 __raw_writeq((scdperfcnt & ~M_SPC_CFG_SRC1) | // keep counters 0,2,3 as is
73 M_SPC_CFG_ENABLE | // enable counting
74 M_SPC_CFG_CLEAR | // clear all counters
75 V_SPC_CFG_SRC1(1), // counter 1 counts cycles
76 IOADDR(A_SCD_PERF_CNT_CFG));
77 __raw_writeq(next, IOADDR(A_SCD_PERF_CNT_1));
78 /* Reset the trace buffer */
79 __raw_writeq(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG));
80 #if 0 && defined(M_SCD_TRACE_CFG_FORCECNT)
81 /* XXXKW may want to expose control to the data-collector */
82 tb_options |= M_SCD_TRACE_CFG_FORCECNT;
84 __raw_writeq(tb_options, IOADDR(A_SCD_TRACE_CFG));
88 static irqreturn_t sbprof_tb_intr(int irq, void *dev_id, struct pt_regs *regs)
91 DBG(printk(DEVNAME ": tb_intr\n"));
92 if (sbp.next_tb_sample < MAX_TB_SAMPLES) {
93 /* XXX should use XKPHYS to make writes bypass L2 */
94 u_int64_t *p = sbp.sbprof_tbbuf[sbp.next_tb_sample++];
96 __raw_writeq(M_SCD_TRACE_CFG_START_READ, IOADDR(A_SCD_TRACE_CFG));
97 __asm__ __volatile__ ("sync" : : : "memory");
98 /* Loop runs backwards because bundles are read out in reverse order */
99 for (i = 256 * 6; i > 0; i -= 6) {
100 // Subscripts decrease to put bundle in the order
101 // t0 lo, t0 hi, t1 lo, t1 hi, t2 lo, t2 hi
102 p[i-1] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); // read t2 hi
103 p[i-2] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); // read t2 lo
104 p[i-3] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); // read t1 hi
105 p[i-4] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); // read t1 lo
106 p[i-5] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); // read t0 hi
107 p[i-6] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); // read t0 lo
109 if (!sbp.tb_enable) {
110 DBG(printk(DEVNAME ": tb_intr shutdown\n"));
111 __raw_writeq(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG));
113 wake_up(&sbp.tb_sync);
115 arm_tb(); // knock down current interrupt and get another one later
118 /* No more trace buffer samples */
119 DBG(printk(DEVNAME ": tb_intr full\n"));
120 __raw_writeq(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG));
122 if (!sbp.tb_enable) {
123 wake_up(&sbp.tb_sync);
125 wake_up(&sbp.tb_read);
130 static irqreturn_t sbprof_pc_intr(int irq, void *dev_id, struct pt_regs *regs)
132 printk(DEVNAME ": unexpected pc_intr");
136 int sbprof_zbprof_start(struct file *filp)
138 u_int64_t scdperfcnt;
143 DBG(printk(DEVNAME ": starting\n"));
146 sbp.next_tb_sample = 0;
150 (K_INT_TRACE_FREEZE, sbprof_tb_intr, 0, DEVNAME " trace freeze", &sbp)) {
153 /* Make sure there isn't a perf-cnt interrupt waiting */
154 scdperfcnt = __raw_readq(IOADDR(A_SCD_PERF_CNT_CFG));
155 /* Disable and clear counters, override SRC_1 */
156 __raw_writeq((scdperfcnt & ~(M_SPC_CFG_SRC1 | M_SPC_CFG_ENABLE)) |
160 IOADDR(A_SCD_PERF_CNT_CFG));
162 /* We grab this interrupt to prevent others from trying to use
163 it, even though we don't want to service the interrupts
164 (they only feed into the trace-on-interrupt mechanism) */
166 (K_INT_PERF_CNT, sbprof_pc_intr, 0, DEVNAME " scd perfcnt", &sbp)) {
167 free_irq(K_INT_TRACE_FREEZE, &sbp);
171 /* I need the core to mask these, but the interrupt mapper to
172 pass them through. I am exploiting my knowledge that
173 cp0_status masks out IP[5]. krw */
174 __raw_writeq(K_INT_MAP_I3,
175 IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MAP_BASE) + (K_INT_PERF_CNT<<3)));
177 /* Initialize address traps */
178 __raw_writeq(0, IOADDR(A_ADDR_TRAP_UP_0));
179 __raw_writeq(0, IOADDR(A_ADDR_TRAP_UP_1));
180 __raw_writeq(0, IOADDR(A_ADDR_TRAP_UP_2));
181 __raw_writeq(0, IOADDR(A_ADDR_TRAP_UP_3));
183 __raw_writeq(0, IOADDR(A_ADDR_TRAP_DOWN_0));
184 __raw_writeq(0, IOADDR(A_ADDR_TRAP_DOWN_1));
185 __raw_writeq(0, IOADDR(A_ADDR_TRAP_DOWN_2));
186 __raw_writeq(0, IOADDR(A_ADDR_TRAP_DOWN_3));
188 __raw_writeq(0, IOADDR(A_ADDR_TRAP_CFG_0));
189 __raw_writeq(0, IOADDR(A_ADDR_TRAP_CFG_1));
190 __raw_writeq(0, IOADDR(A_ADDR_TRAP_CFG_2));
191 __raw_writeq(0, IOADDR(A_ADDR_TRAP_CFG_3));
193 /* Initialize Trace Event 0-7 */
195 __raw_writeq(M_SCD_TREVT_INTERRUPT, IOADDR(A_SCD_TRACE_EVENT_0));
196 __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_1));
197 __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_2));
198 __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_3));
199 __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_4));
200 __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_5));
201 __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_6));
202 __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_7));
204 /* Initialize Trace Sequence 0-7 */
205 // Start on event 0 (interrupt)
206 __raw_writeq(V_SCD_TRSEQ_FUNC_START|0x0fff,
207 IOADDR(A_SCD_TRACE_SEQUENCE_0));
208 // dsamp when d used | asamp when a used
209 __raw_writeq(M_SCD_TRSEQ_ASAMPLE|M_SCD_TRSEQ_DSAMPLE|K_SCD_TRSEQ_TRIGGER_ALL,
210 IOADDR(A_SCD_TRACE_SEQUENCE_1));
211 __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_2));
212 __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_3));
213 __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_4));
214 __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_5));
215 __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_6));
216 __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_7));
218 /* Now indicate the PERF_CNT interrupt as a trace-relevant interrupt */
219 __raw_writeq((1ULL << K_INT_PERF_CNT), IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_TRACE)));
223 DBG(printk(DEVNAME ": done starting\n"));
228 int sbprof_zbprof_stop(void)
230 DBG(printk(DEVNAME ": stopping\n"));
234 /* XXXKW there is a window here where the intr handler
235 may run, see the disable, and do the wake_up before
236 this sleep happens. */
238 DBG(printk(DEVNAME ": wait for disarm\n"));
239 interruptible_sleep_on(&sbp.tb_sync);
240 DBG(printk(DEVNAME ": disarm complete\n"));
242 free_irq(K_INT_TRACE_FREEZE, &sbp);
243 free_irq(K_INT_PERF_CNT, &sbp);
246 DBG(printk(DEVNAME ": done stopping\n"));
251 static int sbprof_tb_open(struct inode *inode, struct file *filp)
255 minor = iminor(inode);
263 memset(&sbp, 0, sizeof(struct sbprof_tb));
264 sbp.sbprof_tbbuf = vmalloc(MAX_TBSAMPLE_BYTES);
265 if (!sbp.sbprof_tbbuf) {
268 memset(sbp.sbprof_tbbuf, 0, MAX_TBSAMPLE_BYTES);
269 init_waitqueue_head(&sbp.tb_sync);
270 init_waitqueue_head(&sbp.tb_read);
276 static int sbprof_tb_release(struct inode *inode, struct file *filp)
280 minor = iminor(inode);
281 if (minor != 0 || !sbp.open) {
285 if (sbp.tb_armed || sbp.tb_enable) {
286 sbprof_zbprof_stop();
289 vfree(sbp.sbprof_tbbuf);
295 static ssize_t sbprof_tb_read(struct file *filp, char *buf,
296 size_t size, loff_t *offp)
298 int cur_sample, sample_off, cur_count, sample_left;
302 long cur_off = *offp;
305 cur_sample = cur_off / TB_SAMPLE_SIZE;
306 sample_off = cur_off % TB_SAMPLE_SIZE;
307 sample_left = TB_SAMPLE_SIZE - sample_off;
308 while (size && (cur_sample < sbp.next_tb_sample)) {
309 cur_count = size < sample_left ? size : sample_left;
310 src = (char *)(((long)sbp.sbprof_tbbuf[cur_sample])+sample_off);
311 copy_to_user(dest, src, cur_count);
312 DBG(printk(DEVNAME ": read from sample %d, %d bytes\n",
313 cur_sample, cur_count));
315 sample_left -= cur_count;
319 sample_left = TB_SAMPLE_SIZE;
321 sample_off += cur_count;
323 cur_off += cur_count;
332 static int sbprof_tb_ioctl(struct inode *inode,
334 unsigned int command,
341 error = sbprof_zbprof_start(filp);
344 error = sbprof_zbprof_stop();
346 case SBPROF_ZBWAITFULL:
347 interruptible_sleep_on(&sbp.tb_read);
348 /* XXXKW check if interrupted? */
349 return put_user(TB_FULL, (int *) arg);
358 static struct file_operations sbprof_tb_fops = {
359 .owner = THIS_MODULE,
360 .open = sbprof_tb_open,
361 .release = sbprof_tb_release,
362 .read = sbprof_tb_read,
363 .ioctl = sbprof_tb_ioctl,
367 static int __init sbprof_tb_init(void)
369 if (register_chrdev(SBPROF_TB_MAJOR, DEVNAME, &sbprof_tb_fops)) {
370 printk(KERN_WARNING DEVNAME ": initialization failed (dev %d)\n",
375 tb_period = zbbus_mhz * 10000LL;
376 printk(KERN_INFO DEVNAME ": initialized - tb_period = %lld\n", tb_period);
380 static void __exit sbprof_tb_cleanup(void)
382 unregister_chrdev(SBPROF_TB_MAJOR, DEVNAME);
385 module_init(sbprof_tb_init);
386 module_exit(sbprof_tb_cleanup);