Juergen Gross
2016-Aug-29 06:48 UTC
[PATCH v6 0/6] Support calling functions on dedicated physical cpu
Some hardware (e.g. Dell Studio laptops) require special functions to
be called on physical cpu 0 in order to avoid occasional hangs. When
running as dom0 under Xen this could be achieved only via special boot
parameters (vcpu pinning) limiting the hypervisor in it's scheduling
decisions.
This patch series is adding a generic function to be able to temporarily
pin a (virtual) cpu to a dedicated physical cpu for executing above
mentioned functions on that specific cpu. The drivers (dcdbas and i8k)
requiring this functionality are modified accordingly.
Changes in V6:
- rebased to kernel 4.8-rc4
Changes in V5:
- patch 3: rename and reshuffle parameters of smp_call_on_cpu() as requested
by Peter Zijlstra
- patch 3: test target cpu to be online as requested by Peter Zijlstra
- patch 4: less wordy messages as requested by David Vrabel
Changes in V4:
- move patches 5 and 6 further up in the series
- patch 2 (was 5): WARN_ONCE in case platform doesn't support pinning
as requested by Peter Zijlstra
- patch 3 (was 2): change return value in case of illegal cpu as
requested by Peter Zijlstra
- patch 3 (was 2): make pinning of vcpu an option as suggested by
Peter Zijlstra
- patches 5 and 6 (were 3 and 4): add call to get_online_cpus()
Changes in V3:
- use get_cpu()/put_cpu() as suggested by David Vrabel
Changes in V2:
- instead of manipulating the allowed set of cpus use cpu specific
workqueue as requested by Peter Zijlstra
- add include/linux/hypervisor.h to hide architecture specific stuff
from generic kernel code
Juergen Gross (6):
xen: sync xen header
virt, sched: add generic vcpu pinning support
smp: add function to execute a function synchronously on a cpu
xen: add xen_pin_vcpu() to support calling functions on a dedicated
pcpu
dcdbas: make use of smp_call_on_cpu()
hwmon: use smp_call_on_cpu() for dell-smm i8k
MAINTAINERS | 1 +
arch/x86/include/asm/hypervisor.h | 4 ++
arch/x86/kernel/cpu/hypervisor.c | 11 +++++
arch/x86/xen/enlighten.c | 40 +++++++++++++++
drivers/firmware/dcdbas.c | 51 +++++++++----------
drivers/hwmon/dell-smm-hwmon.c | 36 ++++++++------
include/linux/hypervisor.h | 17 +++++++
include/linux/smp.h | 3 ++
include/xen/interface/sched.h | 100 +++++++++++++++++++++++++++++++-------
kernel/smp.c | 51 +++++++++++++++++++
kernel/up.c | 18 +++++++
11 files changed, 273 insertions(+), 59 deletions(-)
create mode 100644 include/linux/hypervisor.h
--
2.6.6
Import the actual version of include/xen/interface/sched.h from Xen.
Signed-off-by: Juergen Gross <jgross at suse.com>
Acked-by: David Vrabel <david.vrabel at citrix.com>
---
include/xen/interface/sched.h | 100 ++++++++++++++++++++++++++++++++++--------
1 file changed, 82 insertions(+), 18 deletions(-)
diff --git a/include/xen/interface/sched.h b/include/xen/interface/sched.h
index f184909..a4c4d73 100644
--- a/include/xen/interface/sched.h
+++ b/include/xen/interface/sched.h
@@ -3,6 +3,24 @@
*
* Scheduler state interactions
*
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the
"Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
* Copyright (c) 2005, Keir Fraser <keir at xensource.com>
*/
@@ -12,18 +30,30 @@
#include <xen/interface/event_channel.h>
/*
+ * Guest Scheduler Operations
+ *
+ * The SCHEDOP interface provides mechanisms for a guest to interact
+ * with the scheduler, including yield, blocking and shutting itself
+ * down.
+ */
+
+/*
* The prototype for this hypercall is:
- * long sched_op_new(int cmd, void *arg)
+ * long HYPERVISOR_sched_op(enum sched_op cmd, void *arg, ...)
+ *
* @cmd == SCHEDOP_??? (scheduler operation).
* @arg == Operation-specific extra argument(s), as described below.
+ * ... == Additional Operation-specific extra arguments, described below.
*
- * **NOTE**:
- * Versions of Xen prior to 3.0.2 provide only the following legacy version
+ * Versions of Xen prior to 3.0.2 provided only the following legacy version
* of this hypercall, supporting only the commands yield, block and shutdown:
* long sched_op(int cmd, unsigned long arg)
* @cmd == SCHEDOP_??? (scheduler operation).
* @arg == 0 (SCHEDOP_yield and SCHEDOP_block)
* == SHUTDOWN_* code (SCHEDOP_shutdown)
+ *
+ * This legacy version is available to new guests as:
+ * long HYPERVISOR_sched_op_compat(enum sched_op cmd, unsigned long arg)
*/
/*
@@ -44,12 +74,17 @@
/*
* Halt execution of this domain (all VCPUs) and notify the system controller.
* @arg == pointer to sched_shutdown structure.
+ *
+ * If the sched_shutdown_t reason is SHUTDOWN_suspend then
+ * x86 PV guests must also set RDX (EDX for 32-bit guests) to the MFN
+ * of the guest's start info page. RDX/EDX is the third hypercall
+ * argument.
+ *
+ * In addition, which reason is SHUTDOWN_suspend this hypercall
+ * returns 1 if suspend was cancelled or the domain was merely
+ * checkpointed, and 0 if it is resuming in a new domain.
*/
#define SCHEDOP_shutdown 2
-struct sched_shutdown {
- unsigned int reason; /* SHUTDOWN_* */
-};
-DEFINE_GUEST_HANDLE_STRUCT(sched_shutdown);
/*
* Poll a set of event-channel ports. Return when one or more are pending. An
@@ -57,12 +92,6 @@ DEFINE_GUEST_HANDLE_STRUCT(sched_shutdown);
* @arg == pointer to sched_poll structure.
*/
#define SCHEDOP_poll 3
-struct sched_poll {
- GUEST_HANDLE(evtchn_port_t) ports;
- unsigned int nr_ports;
- uint64_t timeout;
-};
-DEFINE_GUEST_HANDLE_STRUCT(sched_poll);
/*
* Declare a shutdown for another domain. The main use of this function is
@@ -71,15 +100,11 @@ DEFINE_GUEST_HANDLE_STRUCT(sched_poll);
* @arg == pointer to sched_remote_shutdown structure.
*/
#define SCHEDOP_remote_shutdown 4
-struct sched_remote_shutdown {
- domid_t domain_id; /* Remote domain ID */
- unsigned int reason; /* SHUTDOWN_xxx reason */
-};
/*
* Latch a shutdown code, so that when the domain later shuts down it
* reports this code to the control tools.
- * @arg == as for SCHEDOP_shutdown.
+ * @arg == sched_shutdown, as for SCHEDOP_shutdown.
*/
#define SCHEDOP_shutdown_code 5
@@ -92,10 +117,47 @@ struct sched_remote_shutdown {
* With id != 0 and timeout != 0, poke watchdog timer and set new timeout.
*/
#define SCHEDOP_watchdog 6
+
+/*
+ * Override the current vcpu affinity by pinning it to one physical cpu or
+ * undo this override restoring the previous affinity.
+ * @arg == pointer to sched_pin_override structure.
+ *
+ * A negative pcpu value will undo a previous pin override and restore the
+ * previous cpu affinity.
+ * This call is allowed for the hardware domain only and requires the cpu
+ * to be part of the domain's cpupool.
+ */
+#define SCHEDOP_pin_override 7
+
+struct sched_shutdown {
+ unsigned int reason; /* SHUTDOWN_* => shutdown reason */
+};
+DEFINE_GUEST_HANDLE_STRUCT(sched_shutdown);
+
+struct sched_poll {
+ GUEST_HANDLE(evtchn_port_t) ports;
+ unsigned int nr_ports;
+ uint64_t timeout;
+};
+DEFINE_GUEST_HANDLE_STRUCT(sched_poll);
+
+struct sched_remote_shutdown {
+ domid_t domain_id; /* Remote domain ID */
+ unsigned int reason; /* SHUTDOWN_* => shutdown reason */
+};
+DEFINE_GUEST_HANDLE_STRUCT(sched_remote_shutdown);
+
struct sched_watchdog {
uint32_t id; /* watchdog ID */
uint32_t timeout; /* timeout */
};
+DEFINE_GUEST_HANDLE_STRUCT(sched_watchdog);
+
+struct sched_pin_override {
+ int32_t pcpu;
+};
+DEFINE_GUEST_HANDLE_STRUCT(sched_pin_override);
/*
* Reason codes for SCHEDOP_shutdown. These may be interpreted by control
@@ -107,6 +169,7 @@ struct sched_watchdog {
#define SHUTDOWN_suspend 2 /* Clean up, save suspend info, kill. */
#define SHUTDOWN_crash 3 /* Tell controller we've crashed.
*/
#define SHUTDOWN_watchdog 4 /* Restart because watchdog time expired. */
+
/*
* Domain asked to perform 'soft reset' for it. The expected behavior
is to
* reset internal Xen state for the domain returning it to the point where it
@@ -115,5 +178,6 @@ struct sched_watchdog {
* interfaces again.
*/
#define SHUTDOWN_soft_reset 5
+#define SHUTDOWN_MAX 5 /* Maximum valid shutdown reason. */
#endif /* __XEN_PUBLIC_SCHED_H__ */
--
2.6.6
Juergen Gross
2016-Aug-29 06:48 UTC
[PATCH v6 2/6] virt, sched: add generic vcpu pinning support
Add generic virtualization support for pinning the current vcpu to a
specified physical cpu. As this operation isn't performance critical
(a very limited set of operations like BIOS calls and SMIs is expected
to need this) just add a hypervisor specific indirection.
Signed-off-by: Juergen Gross <jgross at suse.com>
---
V4: move this patch some places up in the series
WARN_ONCE in case platform doesn't support pinning as requested by
Peter Zijlstra
V3: use getc_cpu()/put_cpu() as suggested by David Vrabel
V2: adapt to using workqueues
add include/linux/hypervisor.h to hide architecture specific stuff
from generic kernel code
In case paravirt maintainers don't want to be responsible for
include/linux/hypervisor.h I could take it.
---
MAINTAINERS | 1 +
arch/x86/include/asm/hypervisor.h | 4 ++++
arch/x86/kernel/cpu/hypervisor.c | 11 +++++++++++
include/linux/hypervisor.h | 17 +++++++++++++++++
kernel/smp.c | 1 +
kernel/up.c | 1 +
6 files changed, 35 insertions(+)
create mode 100644 include/linux/hypervisor.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 71aa5da..93bcac5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8844,6 +8844,7 @@ S: Supported
F: Documentation/virtual/paravirt_ops.txt
F: arch/*/kernel/paravirt*
F: arch/*/include/asm/paravirt.h
+F: include/linux/hypervisor.h
PARIDE DRIVERS FOR PARALLEL PORT IDE DEVICES
M: Tim Waugh <tim at cyberelk.net>
diff --git a/arch/x86/include/asm/hypervisor.h
b/arch/x86/include/asm/hypervisor.h
index 055ea99..67942b6 100644
--- a/arch/x86/include/asm/hypervisor.h
+++ b/arch/x86/include/asm/hypervisor.h
@@ -43,6 +43,9 @@ struct hypervisor_x86 {
/* X2APIC detection (run once per boot) */
bool (*x2apic_available)(void);
+
+ /* pin current vcpu to specified physical cpu (run rarely) */
+ void (*pin_vcpu)(int);
};
extern const struct hypervisor_x86 *x86_hyper;
@@ -56,6 +59,7 @@ extern const struct hypervisor_x86 x86_hyper_kvm;
extern void init_hypervisor(struct cpuinfo_x86 *c);
extern void init_hypervisor_platform(void);
extern bool hypervisor_x2apic_available(void);
+extern void hypervisor_pin_vcpu(int cpu);
#else
static inline void init_hypervisor(struct cpuinfo_x86 *c) { }
static inline void init_hypervisor_platform(void) { }
diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c
index 27e4665..35691a6 100644
--- a/arch/x86/kernel/cpu/hypervisor.c
+++ b/arch/x86/kernel/cpu/hypervisor.c
@@ -86,3 +86,14 @@ bool __init hypervisor_x2apic_available(void)
x86_hyper->x2apic_available &&
x86_hyper->x2apic_available();
}
+
+void hypervisor_pin_vcpu(int cpu)
+{
+ if (!x86_hyper)
+ return;
+
+ if (x86_hyper->pin_vcpu)
+ x86_hyper->pin_vcpu(cpu);
+ else
+ WARN_ONCE(1, "vcpu pinning requested but not supported!\n");
+}
diff --git a/include/linux/hypervisor.h b/include/linux/hypervisor.h
new file mode 100644
index 0000000..3fa5ef2
--- /dev/null
+++ b/include/linux/hypervisor.h
@@ -0,0 +1,17 @@
+#ifndef __LINUX_HYPEVISOR_H
+#define __LINUX_HYPEVISOR_H
+
+/*
+ * Generic Hypervisor support
+ * Juergen Gross <jgross at suse.com>
+ */
+
+#ifdef CONFIG_HYPERVISOR_GUEST
+#include <asm/hypervisor.h>
+#else
+static inline void hypervisor_pin_vcpu(int cpu)
+{
+}
+#endif
+
+#endif /* __LINUX_HYPEVISOR_H */
diff --git a/kernel/smp.c b/kernel/smp.c
index 3aa642d..4274ca5 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -14,6 +14,7 @@
#include <linux/smp.h>
#include <linux/cpu.h>
#include <linux/sched.h>
+#include <linux/hypervisor.h>
#include "smpboot.h"
diff --git a/kernel/up.c b/kernel/up.c
index 1760bf3..3ccee2b 100644
--- a/kernel/up.c
+++ b/kernel/up.c
@@ -6,6 +6,7 @@
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/smp.h>
+#include <linux/hypervisor.h>
int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
int wait)
--
2.6.6
Juergen Gross
2016-Aug-29 06:48 UTC
[PATCH v6 3/6] smp: add function to execute a function synchronously on a cpu
On some hardware models (e.g. Dell Studio 1555 laptop) some hardware
related functions (e.g. SMIs) are to be executed on physical cpu 0
only. Instead of open coding such a functionality multiple times in
the kernel add a service function for this purpose. This will enable
the possibility to take special measures in virtualized environments
like Xen, too.
Signed-off-by: Juergen Gross <jgross at suse.com>
---
V5: rename and reshuffle parameters of smp_call_on_cpu() as requested by
Peter Zijlstra
test target cpu to be online as requested by Peter Zijlstra
V4: change return value in case of illegal cpu as requested by Peter Zijlstra
make pinning of vcpu an option as suggested by Peter Zijlstra
V2: instead of manipulating the allowed set of cpus use cpu specific
workqueue as requested by Peter Zijlstra
---
include/linux/smp.h | 3 +++
kernel/smp.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
kernel/up.c | 17 +++++++++++++++++
3 files changed, 70 insertions(+)
diff --git a/include/linux/smp.h b/include/linux/smp.h
index eccae469..8e0cb7a 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -196,6 +196,9 @@ extern void arch_enable_nonboot_cpus_end(void);
void smp_setup_processor_id(void);
+int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par,
+ bool phys);
+
/* SMP core functions */
int smpcfd_prepare_cpu(unsigned int cpu);
int smpcfd_dead_cpu(unsigned int cpu);
diff --git a/kernel/smp.c b/kernel/smp.c
index 4274ca5..f4f6137 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -725,3 +725,53 @@ void wake_up_all_idle_cpus(void)
preempt_enable();
}
EXPORT_SYMBOL_GPL(wake_up_all_idle_cpus);
+
+/**
+ * smp_call_on_cpu - Call a function on a specific cpu
+ *
+ * Used to call a function on a specific cpu and wait for it to return.
+ * Optionally make sure the call is done on a specified physical cpu via vcpu
+ * pinning in order to support virtualized environments.
+ */
+struct smp_call_on_cpu_struct {
+ struct work_struct work;
+ struct completion done;
+ int (*func)(void *);
+ void *data;
+ int ret;
+ int cpu;
+};
+
+static void smp_call_on_cpu_callback(struct work_struct *work)
+{
+ struct smp_call_on_cpu_struct *sscs;
+
+ sscs = container_of(work, struct smp_call_on_cpu_struct, work);
+ if (sscs->cpu >= 0)
+ hypervisor_pin_vcpu(sscs->cpu);
+ sscs->ret = sscs->func(sscs->data);
+ if (sscs->cpu >= 0)
+ hypervisor_pin_vcpu(-1);
+
+ complete(&sscs->done);
+}
+
+int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool
phys)
+{
+ struct smp_call_on_cpu_struct sscs = {
+ .work = __WORK_INITIALIZER(sscs.work, smp_call_on_cpu_callback),
+ .done = COMPLETION_INITIALIZER_ONSTACK(sscs.done),
+ .func = func,
+ .data = par,
+ .cpu = phys ? cpu : -1,
+ };
+
+ if (cpu >= nr_cpu_ids || !cpu_online(cpu))
+ return -ENXIO;
+
+ queue_work_on(cpu, system_wq, &sscs.work);
+ wait_for_completion(&sscs.done);
+
+ return sscs.ret;
+}
+EXPORT_SYMBOL_GPL(smp_call_on_cpu);
diff --git a/kernel/up.c b/kernel/up.c
index 3ccee2b..ee81ac9 100644
--- a/kernel/up.c
+++ b/kernel/up.c
@@ -83,3 +83,20 @@ void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
preempt_enable();
}
EXPORT_SYMBOL(on_each_cpu_cond);
+
+int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool
phys)
+{
+ int ret;
+
+ if (cpu != 0)
+ return -ENXIO;
+
+ if (phys)
+ hypervisor_pin_vcpu(0);
+ ret = func(par);
+ if (phys)
+ hypervisor_pin_vcpu(-1);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(smp_call_on_cpu);
--
2.6.6
Juergen Gross
2016-Aug-29 06:48 UTC
[PATCH v6 4/6] xen: add xen_pin_vcpu() to support calling functions on a dedicated pcpu
Some hardware models (e.g. Dell Studio 1555 laptops) require calls to
the firmware to be issued on cpu 0 only. As Dom0 might have to use
these calls, add xen_pin_vcpu() to achieve this functionality.
In case either the domain doesn't have the privilege to make the
related hypercall or the hypervisor isn't supporting it, issue a
warning once and disable further pinning attempts.
Signed-off-by: Juergen Gross <jgross at suse.com>
Acked-by: David Vrabel <david.vrabel at citrix.com>
---
V5: less wordy messages as requested by David Vrabel
---
arch/x86/xen/enlighten.c | 40 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index b86ebb1..bc9aaba 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1925,6 +1925,45 @@ static void xen_set_cpu_features(struct cpuinfo_x86 *c)
}
}
+static void xen_pin_vcpu(int cpu)
+{
+ static bool disable_pinning;
+ struct sched_pin_override pin_override;
+ int ret;
+
+ if (disable_pinning)
+ return;
+
+ pin_override.pcpu = cpu;
+ ret = HYPERVISOR_sched_op(SCHEDOP_pin_override, &pin_override);
+
+ /* Ignore errors when removing override. */
+ if (cpu < 0)
+ return;
+
+ switch (ret) {
+ case -ENOSYS:
+ pr_warn("Unable to pin on physical cpu %d. In case of problems consider
vcpu pinning.\n",
+ cpu);
+ disable_pinning = true;
+ break;
+ case -EPERM:
+ WARN(1, "Trying to pin vcpu without having privilege to do so\n");
+ disable_pinning = true;
+ break;
+ case -EINVAL:
+ case -EBUSY:
+ pr_warn("Physical cpu %d not available for pinning. Check Xen cpu
configuration.\n",
+ cpu);
+ break;
+ case 0:
+ break;
+ default:
+ WARN(1, "rc %d while trying to pin vcpu\n", ret);
+ disable_pinning = true;
+ }
+}
+
const struct hypervisor_x86 x86_hyper_xen = {
.name = "Xen",
.detect = xen_platform,
@@ -1933,6 +1972,7 @@ const struct hypervisor_x86 x86_hyper_xen = {
#endif
.x2apic_available = xen_x2apic_para_available,
.set_cpu_features = xen_set_cpu_features,
+ .pin_vcpu = xen_pin_vcpu,
};
EXPORT_SYMBOL(x86_hyper_xen);
--
2.6.6
Use smp_call_on_cpu() to raise SMI on cpu 0.
Make call secure by adding get_online_cpus() to avoid e.g. suspend
resume cycles in between.
Signed-off-by: Juergen Gross <jgross at suse.com>
---
V4: add call to get_online_cpus()
---
drivers/firmware/dcdbas.c | 51 ++++++++++++++++++++++++-----------------------
1 file changed, 26 insertions(+), 25 deletions(-)
diff --git a/drivers/firmware/dcdbas.c b/drivers/firmware/dcdbas.c
index 829eec8..2fe1a13 100644
--- a/drivers/firmware/dcdbas.c
+++ b/drivers/firmware/dcdbas.c
@@ -23,6 +23,7 @@
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
+#include <linux/cpu.h>
#include <linux/gfp.h>
#include <linux/init.h>
#include <linux/kernel.h>
@@ -238,33 +239,14 @@ static ssize_t host_control_on_shutdown_store(struct
device *dev,
return count;
}
-/**
- * dcdbas_smi_request: generate SMI request
- *
- * Called with smi_data_lock.
- */
-int dcdbas_smi_request(struct smi_cmd *smi_cmd)
+static int raise_smi(void *par)
{
- cpumask_var_t old_mask;
- int ret = 0;
+ struct smi_cmd *smi_cmd = par;
- if (smi_cmd->magic != SMI_CMD_MAGIC) {
- dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n",
- __func__);
- return -EBADR;
- }
-
- /* SMI requires CPU 0 */
- if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
- return -ENOMEM;
-
- cpumask_copy(old_mask, ¤t->cpus_allowed);
- set_cpus_allowed_ptr(current, cpumask_of(0));
if (smp_processor_id() != 0) {
dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n",
__func__);
- ret = -EBUSY;
- goto out;
+ return -EBUSY;
}
/* generate SMI */
@@ -280,9 +262,28 @@ int dcdbas_smi_request(struct smi_cmd *smi_cmd)
: "memory"
);
-out:
- set_cpus_allowed_ptr(current, old_mask);
- free_cpumask_var(old_mask);
+ return 0;
+}
+/**
+ * dcdbas_smi_request: generate SMI request
+ *
+ * Called with smi_data_lock.
+ */
+int dcdbas_smi_request(struct smi_cmd *smi_cmd)
+{
+ int ret;
+
+ if (smi_cmd->magic != SMI_CMD_MAGIC) {
+ dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n",
+ __func__);
+ return -EBADR;
+ }
+
+ /* SMI requires CPU 0 */
+ get_online_cpus();
+ ret = smp_call_on_cpu(0, raise_smi, smi_cmd, true);
+ put_online_cpus();
+
return ret;
}
--
2.6.6
Juergen Gross
2016-Aug-29 06:48 UTC
[PATCH v6 6/6] hwmon: use smp_call_on_cpu() for dell-smm i8k
Use the smp_call_on_cpu() function to call system management
mode on cpu 0.
Make call secure by adding get_online_cpus() to avoid e.g. suspend
resume cycles in between.
Signed-off-by: Juergen Gross <jgross at suse.com>
---
V4: add call to get_online_cpus()
---
drivers/hwmon/dell-smm-hwmon.c | 36 ++++++++++++++++++++----------------
1 file changed, 20 insertions(+), 16 deletions(-)
diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index acf9c03..34704b0 100644
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -21,6 +21,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/cpu.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/types.h>
@@ -36,6 +37,7 @@
#include <linux/io.h>
#include <linux/sched.h>
#include <linux/ctype.h>
+#include <linux/smp.h>
#include <linux/i8k.h>
@@ -134,11 +136,11 @@ static inline const char *i8k_get_dmi_data(int field)
/*
* Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
*/
-static int i8k_smm(struct smm_regs *regs)
+static int i8k_smm_func(void *par)
{
int rc;
+ struct smm_regs *regs = par;
int eax = regs->eax;
- cpumask_var_t old_mask;
#ifdef DEBUG
int ebx = regs->ebx;
@@ -149,16 +151,8 @@ static int i8k_smm(struct smm_regs *regs)
#endif
/* SMM requires CPU 0 */
- if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
- return -ENOMEM;
- cpumask_copy(old_mask, ¤t->cpus_allowed);
- rc = set_cpus_allowed_ptr(current, cpumask_of(0));
- if (rc)
- goto out;
- if (smp_processor_id() != 0) {
- rc = -EBUSY;
- goto out;
- }
+ if (smp_processor_id() != 0)
+ return -EBUSY;
#if defined(CONFIG_X86_64)
asm volatile("pushq %%rax\n\t"
@@ -216,10 +210,6 @@ static int i8k_smm(struct smm_regs *regs)
if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
rc = -EINVAL;
-out:
- set_cpus_allowed_ptr(current, old_mask);
- free_cpumask_var(old_mask);
-
#ifdef DEBUG
rettime = ktime_get();
delta = ktime_sub(rettime, calltime);
@@ -232,6 +222,20 @@ out:
}
/*
+ * Call the System Management Mode BIOS.
+ */
+static int i8k_smm(struct smm_regs *regs)
+{
+ int ret;
+
+ get_online_cpus();
+ ret = smp_call_on_cpu(0, i8k_smm_func, regs, true);
+ put_online_cpus();
+
+ return ret;
+}
+
+/*
* Read the fan status.
*/
static int i8k_get_fan_status(int fan)
--
2.6.6
Possibly Parallel Threads
- [PATCH v4 0/6] Support calling functions on dedicated physical cpu
- [PATCH v4 0/6] Support calling functions on dedicated physical cpu
- [PATCH v6 0/6] Support calling functions on dedicated physical cpu
- [PATCH v5 0/6] Support calling functions on dedicated physical cpu
- [PATCH v5 0/6] Support calling functions on dedicated physical cpu