linux-kernel - [PATCH v6 6/6] hwmon: use smp_call_on

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Message-Id: <1472453327-19050-7-git-send-email-jgross@suse.com>
Date:   Mon, 29 Aug 2016 08:48:47 +0200
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Cc:     boris.ostrovsky@...cle.com, david.vrabel@...rix.com,
        mingo@...hat.com, peterz@...radead.org, Douglas_Warzecha@...l.com,
        pali.rohar@...il.com, jdelvare@...e.com, linux@...ck-us.net,
        tglx@...utronix.de, hpa@...or.com, jeremy@...p.org,
        chrisw@...s-sol.org, akataria@...are.com, rusty@...tcorp.com.au,
        virtualization@...ts.linux-foundation.org, x86@...nel.org,
        Juergen Gross <jgross@...e.com>
Subject: [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@...e.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, &current->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