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authorRalf Baechle <ralf@mips.com>2007-07-03 09:37:43 -0400
committerRalf Baechle <ralf@linux-mips.org>2007-07-10 12:33:04 -0400
commit295cbf6d63165fe4253cf1d9ceadcda47a318b48 (patch)
treef37a2065836ccb32a1438c57ef0eefe3aef1e82d /arch
parent5ddcb3c35be995517a32799796e2acda90a784e0 (diff)
[MIPS] Move FPU affinity code into separate file.
Gets rid of some of the CONFIG_MIPS_MT_FPAFF #ifdefery. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/kernel/Makefile1
-rw-r--r--arch/mips/kernel/mips-mt-fpaff.c176
-rw-r--r--arch/mips/kernel/mips-mt.c169
3 files changed, 177 insertions, 169 deletions
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index 73983eee1431..4b40015a66d2 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_CPU_VR41XX) += r4k_fpu.o r4k_switch.o
37obj-$(CONFIG_SMP) += smp.o 37obj-$(CONFIG_SMP) += smp.o
38 38
39obj-$(CONFIG_MIPS_MT) += mips-mt.o 39obj-$(CONFIG_MIPS_MT) += mips-mt.o
40obj-$(CONFIG_MIPS_MT_FPAFF) += mips-mt-fpaff.o
40obj-$(CONFIG_MIPS_MT_SMTC) += smtc.o smtc-asm.o smtc-proc.o 41obj-$(CONFIG_MIPS_MT_SMTC) += smtc.o smtc-asm.o smtc-proc.o
41obj-$(CONFIG_MIPS_MT_SMP) += smp-mt.o 42obj-$(CONFIG_MIPS_MT_SMP) += smp-mt.o
42 43
diff --git a/arch/mips/kernel/mips-mt-fpaff.c b/arch/mips/kernel/mips-mt-fpaff.c
new file mode 100644
index 000000000000..ede5d73d652e
--- /dev/null
+++ b/arch/mips/kernel/mips-mt-fpaff.c
@@ -0,0 +1,176 @@
1/*
2 * General MIPS MT support routines, usable in AP/SP, SMVP, or SMTC kernels
3 * Copyright (C) 2005 Mips Technologies, Inc
4 */
5#include <linux/cpu.h>
6#include <linux/cpumask.h>
7#include <linux/delay.h>
8#include <linux/kernel.h>
9#include <linux/init.h>
10#include <linux/sched.h>
11#include <linux/security.h>
12#include <linux/types.h>
13#include <asm/uaccess.h>
14
15/*
16 * CPU mask used to set process affinity for MT VPEs/TCs with FPUs
17 */
18cpumask_t mt_fpu_cpumask;
19
20static int fpaff_threshold = -1;
21unsigned long mt_fpemul_threshold = 0;
22
23/*
24 * Replacement functions for the sys_sched_setaffinity() and
25 * sys_sched_getaffinity() system calls, so that we can integrate
26 * FPU affinity with the user's requested processor affinity.
27 * This code is 98% identical with the sys_sched_setaffinity()
28 * and sys_sched_getaffinity() system calls, and should be
29 * updated when kernel/sched.c changes.
30 */
31
32/*
33 * find_process_by_pid - find a process with a matching PID value.
34 * used in sys_sched_set/getaffinity() in kernel/sched.c, so
35 * cloned here.
36 */
37static inline struct task_struct *find_process_by_pid(pid_t pid)
38{
39 return pid ? find_task_by_pid(pid) : current;
40}
41
42
43/*
44 * mipsmt_sys_sched_setaffinity - set the cpu affinity of a process
45 */
46asmlinkage long mipsmt_sys_sched_setaffinity(pid_t pid, unsigned int len,
47 unsigned long __user *user_mask_ptr)
48{
49 cpumask_t new_mask;
50 cpumask_t effective_mask;
51 int retval;
52 struct task_struct *p;
53
54 if (len < sizeof(new_mask))
55 return -EINVAL;
56
57 if (copy_from_user(&new_mask, user_mask_ptr, sizeof(new_mask)))
58 return -EFAULT;
59
60 lock_cpu_hotplug();
61 read_lock(&tasklist_lock);
62
63 p = find_process_by_pid(pid);
64 if (!p) {
65 read_unlock(&tasklist_lock);
66 unlock_cpu_hotplug();
67 return -ESRCH;
68 }
69
70 /*
71 * It is not safe to call set_cpus_allowed with the
72 * tasklist_lock held. We will bump the task_struct's
73 * usage count and drop tasklist_lock before invoking
74 * set_cpus_allowed.
75 */
76 get_task_struct(p);
77
78 retval = -EPERM;
79 if ((current->euid != p->euid) && (current->euid != p->uid) &&
80 !capable(CAP_SYS_NICE)) {
81 read_unlock(&tasklist_lock);
82 goto out_unlock;
83 }
84
85 retval = security_task_setscheduler(p, 0, NULL);
86 if (retval)
87 goto out_unlock;
88
89 /* Record new user-specified CPU set for future reference */
90 p->thread.user_cpus_allowed = new_mask;
91
92 /* Unlock the task list */
93 read_unlock(&tasklist_lock);
94
95 /* Compute new global allowed CPU set if necessary */
96 if ((p->thread.mflags & MF_FPUBOUND)
97 && cpus_intersects(new_mask, mt_fpu_cpumask)) {
98 cpus_and(effective_mask, new_mask, mt_fpu_cpumask);
99 retval = set_cpus_allowed(p, effective_mask);
100 } else {
101 p->thread.mflags &= ~MF_FPUBOUND;
102 retval = set_cpus_allowed(p, new_mask);
103 }
104
105
106out_unlock:
107 put_task_struct(p);
108 unlock_cpu_hotplug();
109 return retval;
110}
111
112/*
113 * mipsmt_sys_sched_getaffinity - get the cpu affinity of a process
114 */
115asmlinkage long mipsmt_sys_sched_getaffinity(pid_t pid, unsigned int len,
116 unsigned long __user *user_mask_ptr)
117{
118 unsigned int real_len;
119 cpumask_t mask;
120 int retval;
121 struct task_struct *p;
122
123 real_len = sizeof(mask);
124 if (len < real_len)
125 return -EINVAL;
126
127 lock_cpu_hotplug();
128 read_lock(&tasklist_lock);
129
130 retval = -ESRCH;
131 p = find_process_by_pid(pid);
132 if (!p)
133 goto out_unlock;
134 retval = security_task_getscheduler(p);
135 if (retval)
136 goto out_unlock;
137
138 cpus_and(mask, p->thread.user_cpus_allowed, cpu_possible_map);
139
140out_unlock:
141 read_unlock(&tasklist_lock);
142 unlock_cpu_hotplug();
143 if (retval)
144 return retval;
145 if (copy_to_user(user_mask_ptr, &mask, real_len))
146 return -EFAULT;
147 return real_len;
148}
149
150
151static int __init fpaff_thresh(char *str)
152{
153 get_option(&str, &fpaff_threshold);
154 return 1;
155}
156__setup("fpaff=", fpaff_thresh);
157
158/*
159 * FPU Use Factor empirically derived from experiments on 34K
160 */
161#define FPUSEFACTOR 333
162
163static __init int mt_fp_affinity_init(void)
164{
165 if (fpaff_threshold >= 0) {
166 mt_fpemul_threshold = fpaff_threshold;
167 } else {
168 mt_fpemul_threshold =
169 (FPUSEFACTOR * (loops_per_jiffy/(500000/HZ))) / HZ;
170 }
171 printk(KERN_DEBUG "FPU Affinity set after %ld emulations\n",
172 mt_fpemul_threshold);
173
174 return 0;
175}
176arch_initcall(mt_fp_affinity_init);
diff --git a/arch/mips/kernel/mips-mt.c b/arch/mips/kernel/mips-mt.c
index b1b994dd41db..1a7d89231299 100644
--- a/arch/mips/kernel/mips-mt.c
+++ b/arch/mips/kernel/mips-mt.c
@@ -6,7 +6,6 @@
6#include <linux/device.h> 6#include <linux/device.h>
7#include <linux/kernel.h> 7#include <linux/kernel.h>
8#include <linux/sched.h> 8#include <linux/sched.h>
9#include <linux/cpumask.h>
10#include <linux/module.h> 9#include <linux/module.h>
11#include <linux/interrupt.h> 10#include <linux/interrupt.h>
12#include <linux/security.h> 11#include <linux/security.h>
@@ -23,149 +22,6 @@
23#include <asm/cacheflush.h> 22#include <asm/cacheflush.h>
24 23
25/* 24/*
26 * CPU mask used to set process affinity for MT VPEs/TCs with FPUs
27 */
28
29cpumask_t mt_fpu_cpumask;
30
31#ifdef CONFIG_MIPS_MT_FPAFF
32
33#include <linux/cpu.h>
34#include <linux/delay.h>
35#include <asm/uaccess.h>
36
37unsigned long mt_fpemul_threshold = 0;
38
39/*
40 * Replacement functions for the sys_sched_setaffinity() and
41 * sys_sched_getaffinity() system calls, so that we can integrate
42 * FPU affinity with the user's requested processor affinity.
43 * This code is 98% identical with the sys_sched_setaffinity()
44 * and sys_sched_getaffinity() system calls, and should be
45 * updated when kernel/sched.c changes.
46 */
47
48/*
49 * find_process_by_pid - find a process with a matching PID value.
50 * used in sys_sched_set/getaffinity() in kernel/sched.c, so
51 * cloned here.
52 */
53static inline struct task_struct *find_process_by_pid(pid_t pid)
54{
55 return pid ? find_task_by_pid(pid) : current;
56}
57
58
59/*
60 * mipsmt_sys_sched_setaffinity - set the cpu affinity of a process
61 */
62asmlinkage long mipsmt_sys_sched_setaffinity(pid_t pid, unsigned int len,
63 unsigned long __user *user_mask_ptr)
64{
65 cpumask_t new_mask;
66 cpumask_t effective_mask;
67 int retval;
68 struct task_struct *p;
69
70 if (len < sizeof(new_mask))
71 return -EINVAL;
72
73 if (copy_from_user(&new_mask, user_mask_ptr, sizeof(new_mask)))
74 return -EFAULT;
75
76 lock_cpu_hotplug();
77 read_lock(&tasklist_lock);
78
79 p = find_process_by_pid(pid);
80 if (!p) {
81 read_unlock(&tasklist_lock);
82 unlock_cpu_hotplug();
83 return -ESRCH;
84 }
85
86 /*
87 * It is not safe to call set_cpus_allowed with the
88 * tasklist_lock held. We will bump the task_struct's
89 * usage count and drop tasklist_lock before invoking
90 * set_cpus_allowed.
91 */
92 get_task_struct(p);
93
94 retval = -EPERM;
95 if ((current->euid != p->euid) && (current->euid != p->uid) &&
96 !capable(CAP_SYS_NICE)) {
97 read_unlock(&tasklist_lock);
98 goto out_unlock;
99 }
100
101 retval = security_task_setscheduler(p, 0, NULL);
102 if (retval)
103 goto out_unlock;
104
105 /* Record new user-specified CPU set for future reference */
106 p->thread.user_cpus_allowed = new_mask;
107
108 /* Unlock the task list */
109 read_unlock(&tasklist_lock);
110
111 /* Compute new global allowed CPU set if necessary */
112 if ((p->thread.mflags & MF_FPUBOUND)
113 && cpus_intersects(new_mask, mt_fpu_cpumask)) {
114 cpus_and(effective_mask, new_mask, mt_fpu_cpumask);
115 retval = set_cpus_allowed(p, effective_mask);
116 } else {
117 p->thread.mflags &= ~MF_FPUBOUND;
118 retval = set_cpus_allowed(p, new_mask);
119 }
120
121
122out_unlock:
123 put_task_struct(p);
124 unlock_cpu_hotplug();
125 return retval;
126}
127
128/*
129 * mipsmt_sys_sched_getaffinity - get the cpu affinity of a process
130 */
131asmlinkage long mipsmt_sys_sched_getaffinity(pid_t pid, unsigned int len,
132 unsigned long __user *user_mask_ptr)
133{
134 unsigned int real_len;
135 cpumask_t mask;
136 int retval;
137 struct task_struct *p;
138
139 real_len = sizeof(mask);
140 if (len < real_len)
141 return -EINVAL;
142
143 lock_cpu_hotplug();
144 read_lock(&tasklist_lock);
145
146 retval = -ESRCH;
147 p = find_process_by_pid(pid);
148 if (!p)
149 goto out_unlock;
150 retval = security_task_getscheduler(p);
151 if (retval)
152 goto out_unlock;
153
154 cpus_and(mask, p->thread.user_cpus_allowed, cpu_possible_map);
155
156out_unlock:
157 read_unlock(&tasklist_lock);
158 unlock_cpu_hotplug();
159 if (retval)
160 return retval;
161 if (copy_to_user(user_mask_ptr, &mask, real_len))
162 return -EFAULT;
163 return real_len;
164}
165
166#endif /* CONFIG_MIPS_MT_FPAFF */
167
168/*
169 * Dump new MIPS MT state for the core. Does not leave TCs halted. 25 * Dump new MIPS MT state for the core. Does not leave TCs halted.
170 * Takes an argument which taken to be a pre-call MVPControl value. 26 * Takes an argument which taken to be a pre-call MVPControl value.
171 */ 27 */
@@ -314,17 +170,6 @@ static int __init ndflush(char *s)
314 return 1; 170 return 1;
315} 171}
316__setup("ndflush=", ndflush); 172__setup("ndflush=", ndflush);
317#ifdef CONFIG_MIPS_MT_FPAFF
318static int fpaff_threshold = -1;
319
320static int __init fpaff_thresh(char *str)
321{
322 get_option(&str, &fpaff_threshold);
323 return 1;
324}
325
326__setup("fpaff=", fpaff_thresh);
327#endif /* CONFIG_MIPS_MT_FPAFF */
328 173
329static unsigned int itc_base = 0; 174static unsigned int itc_base = 0;
330 175
@@ -380,20 +225,6 @@ void mips_mt_set_cpuoptions(void)
380 if (mt_n_dflushes != 1) 225 if (mt_n_dflushes != 1)
381 printk("D-Cache Flushes Repeated %d times\n", mt_n_dflushes); 226 printk("D-Cache Flushes Repeated %d times\n", mt_n_dflushes);
382 227
383#ifdef CONFIG_MIPS_MT_FPAFF
384 /* FPU Use Factor empirically derived from experiments on 34K */
385#define FPUSEFACTOR 333
386
387 if (fpaff_threshold >= 0) {
388 mt_fpemul_threshold = fpaff_threshold;
389 } else {
390 mt_fpemul_threshold =
391 (FPUSEFACTOR * (loops_per_jiffy / (500000 / HZ))) / HZ;
392 }
393 printk("FPU Affinity set after %ld emulations\n",
394 mt_fpemul_threshold);
395#endif /* CONFIG_MIPS_MT_FPAFF */
396
397 if (itc_base != 0) { 228 if (itc_base != 0) {
398 /* 229 /*
399 * Configure ITC mapping. This code is very 230 * Configure ITC mapping. This code is very
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