lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

microcode: use suspend-related CPU hotplug notifications

Browse Source 
Make the microcode driver use the suspend-related CPU hotplug notifications
to handle the CPU hotplug events occuring during system-wide suspend and
resume transitions.  Remove the global variable suspend_cpu_hotplug
previously used for this purpose.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rafael J. Wysocki
2007-05-09 02:35:11 -07:00
committed by Linus Torvalds
parent 8bb7844286
commit 455c017ae3
2 changed files with 36 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files

62
arch/i386/kernel/microcode.c
View File

@@ -567,7 +567,7 @@ static int cpu_request_microcode(int cpu)
return error;
}
static int apply_microcode_on_cpu(int cpu)
static int apply_microcode_check_cpu(int cpu)
{
struct cpuinfo_x86 *c = cpu_data + cpu;
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
@@ -575,8 +575,9 @@ static int apply_microcode_on_cpu(int cpu)
unsigned int val[2];
int err = 0;
/* Check if the microcode is available */
if (!uci->mc)
return -EINVAL;
return 0;
old = current->cpus_allowed;
set_cpus_allowed(current, cpumask_of_cpu(cpu));
@@ -614,7 +615,7 @@ static int apply_microcode_on_cpu(int cpu)
return err;
}
static void microcode_init_cpu(int cpu)
static void microcode_init_cpu(int cpu, int resume)
{
cpumask_t old;
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
@@ -624,8 +625,7 @@ static void microcode_init_cpu(int cpu)
set_cpus_allowed(current, cpumask_of_cpu(cpu));
mutex_lock(&microcode_mutex);
collect_cpu_info(cpu);
if (uci->valid && system_state == SYSTEM_RUNNING &&
!suspend_cpu_hotplug)
if (uci->valid && system_state == SYSTEM_RUNNING && !resume)
cpu_request_microcode(cpu);
mutex_unlock(&microcode_mutex);
set_cpus_allowed(current, old);
@@ -702,7 +702,7 @@ static struct attribute_group mc_attr_group = {
.name = "microcode",
};
static int mc_sysdev_add(struct sys_device *sys_dev)
static int __mc_sysdev_add(struct sys_device *sys_dev, int resume)
{
int err, cpu = sys_dev->id;
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
@@ -711,39 +711,31 @@ static int mc_sysdev_add(struct sys_device *sys_dev)
return 0;
pr_debug("Microcode:CPU %d added\n", cpu);
/* If suspend_cpu_hotplug is set, the system is resuming and we should
* use the data from before the suspend.
*/
if (suspend_cpu_hotplug) {
err = apply_microcode_on_cpu(cpu);
if (err)
microcode_fini_cpu(cpu);
}
if (!uci->valid)
memset(uci, 0, sizeof(*uci));
memset(uci, 0, sizeof(*uci));
err = sysfs_create_group(&sys_dev->kobj, &mc_attr_group);
if (err)
return err;
if (!uci->valid)
microcode_init_cpu(cpu);
microcode_init_cpu(cpu, resume);
return 0;
}
static int mc_sysdev_add(struct sys_device *sys_dev)
{
return __mc_sysdev_add(sys_dev, 0);
}
static int mc_sysdev_remove(struct sys_device *sys_dev)
{
int cpu = sys_dev->id;
if (!cpu_online(cpu))
return 0;
pr_debug("Microcode:CPU %d removed\n", cpu);
/* If suspend_cpu_hotplug is set, the system is suspending and we should
* keep the microcode in memory for the resume.
*/
if (!suspend_cpu_hotplug)
microcode_fini_cpu(cpu);
microcode_fini_cpu(cpu);
sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
return 0;
}
@@ -774,16 +766,34 @@ mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu)
sys_dev = get_cpu_sysdev(cpu);
switch (action) {
case CPU_UP_CANCELED_FROZEN:
/* The CPU refused to come up during a system resume */
microcode_fini_cpu(cpu);
break;
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
case CPU_DOWN_FAILED:
case CPU_DOWN_FAILED_FROZEN:
mc_sysdev_add(sys_dev);
break;
case CPU_ONLINE_FROZEN:
/* System-wide resume is in progress, try to apply microcode */
if (apply_microcode_check_cpu(cpu)) {
/* The application of microcode failed */
microcode_fini_cpu(cpu);
__mc_sysdev_add(sys_dev, 1);
break;
}
case CPU_DOWN_FAILED_FROZEN:
if (sysfs_create_group(&sys_dev->kobj, &mc_attr_group))
printk(KERN_ERR "Microcode: Failed to create the sysfs "
"group for CPU%d\n", cpu);
break;
case CPU_DOWN_PREPARE:
case CPU_DOWN_PREPARE_FROZEN:
mc_sysdev_remove(sys_dev);
break;
case CPU_DOWN_PREPARE_FROZEN:
/* Suspend is in progress, only remove the interface */
sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
break;
}
return NOTIFY_OK;
}