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authorMike Kravetz <kravetz@us.ibm.com>2006-09-06 19:23:12 -0400
committerPaul Mackerras <paulus@samba.org>2006-09-13 04:39:53 -0400
commit57852a853b0d6761f270be0961d5d8387e98c8bb (patch)
treef3c3ff7ec94014a9acba27761dd489fdce1c66db /arch/powerpc/platforms/pseries
parentab06ff3af34a6288b314862abfebd86ad918c5d9 (diff)
[POWERPC] powerpc: Instrument Hypervisor Calls
Add instrumentation for hypervisor calls on pseries. Call statistics include number of calls, wall time and cpu cycles (if available) and are made available via debugfs. Instrumentation code is behind the HCALL_STATS config option and has no impact if not enabled. Signed-off-by: Mike Kravetz <kravetz@us.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/platforms/pseries')
-rw-r--r--arch/powerpc/platforms/pseries/Makefile1
-rw-r--r--arch/powerpc/platforms/pseries/hvCall.S72
-rw-r--r--arch/powerpc/platforms/pseries/hvCall_inst.c129
3 files changed, 202 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile
index e5e0ff46690..997243a91be 100644
--- a/arch/powerpc/platforms/pseries/Makefile
+++ b/arch/powerpc/platforms/pseries/Makefile
@@ -12,3 +12,4 @@ obj-$(CONFIG_EEH) += eeh.o eeh_cache.o eeh_driver.o eeh_event.o
12 12
13obj-$(CONFIG_HVC_CONSOLE) += hvconsole.o 13obj-$(CONFIG_HVC_CONSOLE) += hvconsole.o
14obj-$(CONFIG_HVCS) += hvcserver.o 14obj-$(CONFIG_HVCS) += hvcserver.o
15obj-$(CONFIG_HCALL_STATS) += hvCall_inst.o
diff --git a/arch/powerpc/platforms/pseries/hvCall.S b/arch/powerpc/platforms/pseries/hvCall.S
index 9a99b056bd2..c00cfed7af2 100644
--- a/arch/powerpc/platforms/pseries/hvCall.S
+++ b/arch/powerpc/platforms/pseries/hvCall.S
@@ -10,9 +10,69 @@
10#include <asm/hvcall.h> 10#include <asm/hvcall.h>
11#include <asm/processor.h> 11#include <asm/processor.h>
12#include <asm/ppc_asm.h> 12#include <asm/ppc_asm.h>
13#include <asm/asm-offsets.h>
13 14
14#define STK_PARM(i) (48 + ((i)-3)*8) 15#define STK_PARM(i) (48 + ((i)-3)*8)
15 16
17#ifdef CONFIG_HCALL_STATS
18/*
19 * precall must preserve all registers. use unused STK_PARM()
20 * areas to save snapshots and opcode.
21 */
22#define HCALL_INST_PRECALL \
23 std r3,STK_PARM(r3)(r1); /* save opcode */ \
24 mftb r0; /* get timebase and */ \
25 std r0,STK_PARM(r5)(r1); /* save for later */ \
26BEGIN_FTR_SECTION; \
27 mfspr r0,SPRN_PURR; /* get PURR and */ \
28 std r0,STK_PARM(r6)(r1); /* save for later */ \
29END_FTR_SECTION_IFCLR(CPU_FTR_PURR);
30
31/*
32 * postcall is performed immediately before function return which
33 * allows liberal use of volatile registers.
34 */
35#define HCALL_INST_POSTCALL \
36 ld r4,STK_PARM(r3)(r1); /* validate opcode */ \
37 cmpldi cr7,r4,MAX_HCALL_OPCODE; \
38 bgt- cr7,1f; \
39 \
40 /* get time and PURR snapshots after hcall */ \
41 mftb r7; /* timebase after */ \
42BEGIN_FTR_SECTION; \
43 mfspr r8,SPRN_PURR; /* PURR after */ \
44 ld r6,STK_PARM(r6)(r1); /* PURR before */ \
45 subf r6,r6,r8; /* delta */ \
46END_FTR_SECTION_IFCLR(CPU_FTR_PURR); \
47 ld r5,STK_PARM(r5)(r1); /* timebase before */ \
48 subf r5,r5,r7; /* time delta */ \
49 \
50 /* calculate address of stat structure r4 = opcode */ \
51 srdi r4,r4,2; /* index into array */ \
52 mulli r4,r4,HCALL_STAT_SIZE; \
53 LOAD_REG_ADDR(r7, per_cpu__hcall_stats); \
54 add r4,r4,r7; \
55 ld r7,PACA_DATA_OFFSET(r13); /* per cpu offset */ \
56 add r4,r4,r7; \
57 \
58 /* update stats */ \
59 ld r7,HCALL_STAT_CALLS(r4); /* count */ \
60 addi r7,r7,1; \
61 std r7,HCALL_STAT_CALLS(r4); \
62 ld r7,HCALL_STAT_TB(r4); /* timebase */ \
63 add r7,r7,r5; \
64 std r7,HCALL_STAT_TB(r4); \
65BEGIN_FTR_SECTION; \
66 ld r7,HCALL_STAT_PURR(r4); /* PURR */ \
67 add r7,r7,r6; \
68 std r7,HCALL_STAT_PURR(r4); \
69END_FTR_SECTION_IFCLR(CPU_FTR_PURR); \
701:
71#else
72#define HCALL_INST_PRECALL
73#define HCALL_INST_POSTCALL
74#endif
75
16 .text 76 .text
17 77
18_GLOBAL(plpar_hcall_norets) 78_GLOBAL(plpar_hcall_norets)
@@ -21,8 +81,12 @@ _GLOBAL(plpar_hcall_norets)
21 mfcr r0 81 mfcr r0
22 stw r0,8(r1) 82 stw r0,8(r1)
23 83
84 HCALL_INST_PRECALL
85
24 HVSC /* invoke the hypervisor */ 86 HVSC /* invoke the hypervisor */
25 87
88 HCALL_INST_POSTCALL
89
26 lwz r0,8(r1) 90 lwz r0,8(r1)
27 mtcrf 0xff,r0 91 mtcrf 0xff,r0
28 blr /* return r3 = status */ 92 blr /* return r3 = status */
@@ -33,6 +97,8 @@ _GLOBAL(plpar_hcall)
33 mfcr r0 97 mfcr r0
34 stw r0,8(r1) 98 stw r0,8(r1)
35 99
100 HCALL_INST_PRECALL
101
36 std r4,STK_PARM(r4)(r1) /* Save ret buffer */ 102 std r4,STK_PARM(r4)(r1) /* Save ret buffer */
37 103
38 mr r4,r5 104 mr r4,r5
@@ -50,6 +116,8 @@ _GLOBAL(plpar_hcall)
50 std r6, 16(r12) 116 std r6, 16(r12)
51 std r7, 24(r12) 117 std r7, 24(r12)
52 118
119 HCALL_INST_POSTCALL
120
53 lwz r0,8(r1) 121 lwz r0,8(r1)
54 mtcrf 0xff,r0 122 mtcrf 0xff,r0
55 123
@@ -61,6 +129,8 @@ _GLOBAL(plpar_hcall9)
61 mfcr r0 129 mfcr r0
62 stw r0,8(r1) 130 stw r0,8(r1)
63 131
132 HCALL_INST_PRECALL
133
64 std r4,STK_PARM(r4)(r1) /* Save ret buffer */ 134 std r4,STK_PARM(r4)(r1) /* Save ret buffer */
65 135
66 mr r4,r5 136 mr r4,r5
@@ -86,6 +156,8 @@ _GLOBAL(plpar_hcall9)
86 std r11,56(r12) 156 std r11,56(r12)
87 std r12,64(r12) 157 std r12,64(r12)
88 158
159 HCALL_INST_POSTCALL
160
89 lwz r0,8(r1) 161 lwz r0,8(r1)
90 mtcrf 0xff,r0 162 mtcrf 0xff,r0
91 163
diff --git a/arch/powerpc/platforms/pseries/hvCall_inst.c b/arch/powerpc/platforms/pseries/hvCall_inst.c
new file mode 100644
index 00000000000..641e6511cf0
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/hvCall_inst.c
@@ -0,0 +1,129 @@
1/*
2 * Copyright (C) 2006 Mike Kravetz IBM Corporation
3 *
4 * Hypervisor Call Instrumentation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21#include <linux/kernel.h>
22#include <linux/percpu.h>
23#include <linux/debugfs.h>
24#include <linux/seq_file.h>
25#include <linux/cpumask.h>
26#include <asm/hvcall.h>
27#include <asm/firmware.h>
28#include <asm/cputable.h>
29
30DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);
31
32/*
33 * Routines for displaying the statistics in debugfs
34 */
35static void *hc_start(struct seq_file *m, loff_t *pos)
36{
37 if ((int)*pos < HCALL_STAT_ARRAY_SIZE)
38 return (void *)(unsigned long)(*pos + 1);
39
40 return NULL;
41}
42
43static void *hc_next(struct seq_file *m, void *p, loff_t * pos)
44{
45 ++*pos;
46
47 return hc_start(m, pos);
48}
49
50static void hc_stop(struct seq_file *m, void *p)
51{
52}
53
54static int hc_show(struct seq_file *m, void *p)
55{
56 unsigned long h_num = (unsigned long)p;
57 struct hcall_stats *hs = (struct hcall_stats *)m->private;
58
59 if (hs[h_num].num_calls) {
60 if (!cpu_has_feature(CPU_FTR_PURR))
61 seq_printf(m, "%lu %lu %lu %lu\n", h_num<<2,
62 hs[h_num].num_calls,
63 hs[h_num].tb_total,
64 hs[h_num].purr_total);
65 else
66 seq_printf(m, "%lu %lu %lu\n", h_num<<2,
67 hs[h_num].num_calls,
68 hs[h_num].tb_total);
69 }
70
71 return 0;
72}
73
74static struct seq_operations hcall_inst_seq_ops = {
75 .start = hc_start,
76 .next = hc_next,
77 .stop = hc_stop,
78 .show = hc_show
79};
80
81static int hcall_inst_seq_open(struct inode *inode, struct file *file)
82{
83 int rc;
84 struct seq_file *seq;
85
86 rc = seq_open(file, &hcall_inst_seq_ops);
87 seq = file->private_data;
88 seq->private = file->f_dentry->d_inode->u.generic_ip;
89
90 return rc;
91}
92
93static struct file_operations hcall_inst_seq_fops = {
94 .open = hcall_inst_seq_open,
95 .read = seq_read,
96 .llseek = seq_lseek,
97 .release = seq_release,
98};
99
100#define HCALL_ROOT_DIR "hcall_inst"
101#define CPU_NAME_BUF_SIZE 32
102
103static int __init hcall_inst_init(void)
104{
105 struct dentry *hcall_root;
106 struct dentry *hcall_file;
107 char cpu_name_buf[CPU_NAME_BUF_SIZE];
108 int cpu;
109
110 if (!firmware_has_feature(FW_FEATURE_LPAR))
111 return 0;
112
113 hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
114 if (!hcall_root)
115 return -ENOMEM;
116
117 for_each_possible_cpu(cpu) {
118 snprintf(cpu_name_buf, CPU_NAME_BUF_SIZE, "cpu%d", cpu);
119 hcall_file = debugfs_create_file(cpu_name_buf, S_IRUGO,
120 hcall_root,
121 per_cpu(hcall_stats, cpu),
122 &hcall_inst_seq_fops);
123 if (!hcall_file)
124 return -ENOMEM;
125 }
126
127 return 0;
128}
129__initcall(hcall_inst_init);