ARM: 5901/2: arm/oprofile: reserve the PMU when starting

Make sure that we have access to the performance counters and
that they aren't being used by perf events or anything else.

Cc: Will Deacon <will.deacon@arm.com>
Cc: Jean Pihet <jpihet@mvista.com>
Signed-off-by: Jamie Iles <jamie.iles@picochip.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

7 files changed, 85 insertions, 64 deletions

diff --git a/arch/arm/oprofile/op_model_arm11_core.c b/arch/arm/oprofile/op_model_arm11_core.c
index ad80752cb9fb..ef3e2653b90c 100644
--- a/arch/arm/oprofile/op_model_arm11_core.c
+++ b/arch/arm/oprofile/op_model_arm11_core.c
@@ -132,7 +132,7 @@ static irqreturn_t arm11_pmu_interrupt(int irq, void *arg)
         return IRQ_HANDLED;
 }
 
-int arm11_request_interrupts(int *irqs, int nr)
+int arm11_request_interrupts(const int *irqs, int nr)
 {
         unsigned int i;
         int ret = 0;
@@ -153,7 +153,7 @@ int arm11_request_interrupts(int *irqs, int nr)
         return ret;
 }
 
-void arm11_release_interrupts(int *irqs, int nr)
+void arm11_release_interrupts(const int *irqs, int nr)
 {
         unsigned int i;
 
diff --git a/arch/arm/oprofile/op_model_arm11_core.h b/arch/arm/oprofile/op_model_arm11_core.h
index 6f8538e5a960..1902b99d9dfd 100644
--- a/arch/arm/oprofile/op_model_arm11_core.h
+++ b/arch/arm/oprofile/op_model_arm11_core.h
@@ -39,7 +39,7 @@
 int arm11_setup_pmu(void);
 int arm11_start_pmu(void);
 int arm11_stop_pmu(void);
-int arm11_request_interrupts(int *, int);
-void arm11_release_interrupts(int *, int);
+int arm11_request_interrupts(const int *, int);
+void arm11_release_interrupts(const int *, int);
 
 #endif
diff --git a/arch/arm/oprofile/op_model_mpcore.c b/arch/arm/oprofile/op_model_mpcore.c
index 4ce0f9801e2e..f73ce875a395 100644
--- a/arch/arm/oprofile/op_model_mpcore.c
+++ b/arch/arm/oprofile/op_model_mpcore.c
@@ -32,6 +32,7 @@
 /* #define DEBUG */
 #include <linux/types.h>
 #include <linux/errno.h>
+#include <linux/err.h>
 #include <linux/sched.h>
 #include <linux/oprofile.h>
 #include <linux/interrupt.h>
@@ -43,6 +44,7 @@
 #include <mach/hardware.h>
 #include <mach/board-eb.h>
 #include <asm/system.h>
+#include <asm/pmu.h>
 
 #include "op_counter.h"
 #include "op_arm_model.h"
@@ -58,6 +60,7 @@
  * Bitmask of used SCU counters
  */
 static unsigned int scu_em_used;
+static const struct pmu_irqs *pmu_irqs;
 
 /*
  * 2 helper fns take a counter number from 0-7 (not the userspace-visible counter number)
@@ -225,33 +228,40 @@ static int em_setup_ctrs(void)
         return 0;
 }
 
-static int arm11_irqs[] = {
-        [0]     = IRQ_EB11MP_PMU_CPU0,
-        [1]     = IRQ_EB11MP_PMU_CPU1,
-        [2]     = IRQ_EB11MP_PMU_CPU2,
-        [3]     = IRQ_EB11MP_PMU_CPU3
-};
-
 static int em_start(void)
 {
         int ret;
 
-        ret = arm11_request_interrupts(arm11_irqs, ARRAY_SIZE(arm11_irqs));
+        pmu_irqs = reserve_pmu();
+        if (IS_ERR(pmu_irqs)) {
+                ret = PTR_ERR(pmu_irqs);
+                goto out;
+        }
+
+        ret = arm11_request_interrupts(pmu_irqs->irqs, pmu_irqs->num_irqs);
         if (ret == 0) {
                 em_call_function(arm11_start_pmu);
 
                 ret = scu_start();
-                if (ret)
-                        arm11_release_interrupts(arm11_irqs, ARRAY_SIZE(arm11_irqs));
+                if (ret) {
+                        arm11_release_interrupts(pmu_irqs->irqs,
+                                                 pmu_irqs->num_irqs);
+                } else {
+                        release_pmu(pmu_irqs);
+                        pmu_irqs = NULL;
+                }
         }
+
+out:
         return ret;
 }
 
 static void em_stop(void)
 {
         em_call_function(arm11_stop_pmu);
-        arm11_release_interrupts(arm11_irqs, ARRAY_SIZE(arm11_irqs));
+        arm11_release_interrupts(pmu_irqs->irqs, pmu_irqs->num_irqs);
         scu_stop();
+        release_pmu(pmu_irqs);
 }
 
 /*
@@ -283,15 +293,7 @@ static int em_setup(void)
         em_route_irq(IRQ_EB11MP_PMU_SCU6, 3);
         em_route_irq(IRQ_EB11MP_PMU_SCU7, 3);
 
-        /*
-         * Send CP15 PMU interrupts to the owner CPU.
-         */
-        em_route_irq(IRQ_EB11MP_PMU_CPU0, 0);
-        em_route_irq(IRQ_EB11MP_PMU_CPU1, 1);
-        em_route_irq(IRQ_EB11MP_PMU_CPU2, 2);
-        em_route_irq(IRQ_EB11MP_PMU_CPU3, 3);
-
-        return 0;
+        return init_pmu();
 }
 
 struct op_arm_model_spec op_mpcore_spec = {
diff --git a/arch/arm/oprofile/op_model_v6.c b/arch/arm/oprofile/op_model_v6.c
index f7d2ec5ee9a1..a22357a2fd08 100644
--- a/arch/arm/oprofile/op_model_v6.c
+++ b/arch/arm/oprofile/op_model_v6.c
@@ -19,39 +19,47 @@
 /* #define DEBUG */
 #include <linux/types.h>
 #include <linux/errno.h>
+#include <linux/err.h>
 #include <linux/sched.h>
 #include <linux/oprofile.h>
 #include <linux/interrupt.h>
 #include <asm/irq.h>
 #include <asm/system.h>
+#include <asm/pmu.h>
 
 #include "op_counter.h"
 #include "op_arm_model.h"
 #include "op_model_arm11_core.h"
 
-static int irqs[] = {
-#ifdef CONFIG_ARCH_OMAP2
-        3,
-#endif
-#ifdef CONFIG_ARCH_BCMRING
-        IRQ_PMUIRQ, /* for BCMRING, ARM PMU interrupt is 43 */
-#endif
-};
+static const struct pmu_irqs *pmu_irqs;
 
 static void armv6_pmu_stop(void)
 {
         arm11_stop_pmu();
-        arm11_release_interrupts(irqs, ARRAY_SIZE(irqs));
+        arm11_release_interrupts(pmu_irqs->irqs, pmu_irqs->num_irqs);
+        release_pmu(pmu_irqs);
+        pmu_irqs = NULL;
 }
 
 static int armv6_pmu_start(void)
 {
         int ret;
 
-        ret = arm11_request_interrupts(irqs, ARRAY_SIZE(irqs));
-        if (ret >= 0)
+        pmu_irqs = reserve_pmu();
+        if (IS_ERR(pmu_irqs)) {
+                ret = PTR_ERR(pmu_irqs);
+                goto out;
+        }
+
+        ret = arm11_request_interrupts(pmu_irqs->irqs, pmu_irqs->num_irqs);
+        if (ret >= 0) {
                 ret = arm11_start_pmu();
+        } else {
+                release_pmu(pmu_irqs);
+                pmu_irqs = NULL;
+        }
 
+out:
         return ret;
 }
 
diff --git a/arch/arm/oprofile/op_model_v7.c b/arch/arm/oprofile/op_model_v7.c
index 2088a6c0cc0e..8642d0891ae1 100644
--- a/arch/arm/oprofile/op_model_v7.c
+++ b/arch/arm/oprofile/op_model_v7.c
@@ -11,11 +11,14 @@
  */
 #include <linux/types.h>
 #include <linux/errno.h>
+#include <linux/err.h>
 #include <linux/oprofile.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/smp.h>
 
+#include <asm/pmu.h>
+
 #include "op_counter.h"
 #include "op_arm_model.h"
 #include "op_model_v7.h"
@@ -295,7 +298,7 @@ static irqreturn_t armv7_pmnc_interrupt(int irq, void *arg)
         return IRQ_HANDLED;
 }
 
-int armv7_request_interrupts(int *irqs, int nr)
+int armv7_request_interrupts(const int *irqs, int nr)
 {
         unsigned int i;
         int ret = 0;
@@ -318,7 +321,7 @@ int armv7_request_interrupts(int *irqs, int nr)
         return ret;
 }
 
-void armv7_release_interrupts(int *irqs, int nr)
+void armv7_release_interrupts(const int *irqs, int nr)
 {
         unsigned int i;
 
@@ -362,12 +365,7 @@ static void armv7_pmnc_dump_regs(void)
 }
 #endif
 
-
-static int irqs[] = {
-#ifdef CONFIG_ARCH_OMAP3
-        INT_34XX_BENCH_MPU_EMUL,
-#endif
-};
+static const struct pmu_irqs *pmu_irqs;
 
 static void armv7_pmnc_stop(void)
 {
@@ -375,19 +373,29 @@ static void armv7_pmnc_stop(void)
         armv7_pmnc_dump_regs();
 #endif
         armv7_stop_pmnc();
-        armv7_release_interrupts(irqs, ARRAY_SIZE(irqs));
+        armv7_release_interrupts(pmu_irqs->irqs, pmu_irqs->num_irqs);
+        release_pmu(pmu_irqs);
+        pmu_irqs = NULL;
 }
 
 static int armv7_pmnc_start(void)
 {
         int ret;
 
+        pmu_irqs = reserve_pmu();
+        if (IS_ERR(pmu_irqs))
+                return PTR_ERR(pmu_irqs);
+
 #ifdef DEBUG
         armv7_pmnc_dump_regs();
 #endif
-        ret = armv7_request_interrupts(irqs, ARRAY_SIZE(irqs));
-        if (ret >= 0)
+        ret = armv7_request_interrupts(pmu_irqs->irqs, pmu_irqs->num_irqs);
+        if (ret >= 0) {
                 armv7_start_pmnc();
+        } else {
+                release_pmu(pmu_irqs);
+                pmu_irqs = NULL;
+        }
 
         return ret;
 }
diff --git a/arch/arm/oprofile/op_model_v7.h b/arch/arm/oprofile/op_model_v7.h
index 0e19bcc2e100..9ca334b39c75 100644
--- a/arch/arm/oprofile/op_model_v7.h
+++ b/arch/arm/oprofile/op_model_v7.h
@@ -97,7 +97,7 @@
 int armv7_setup_pmu(void);
 int armv7_start_pmu(void);
 int armv7_stop_pmu(void);
-int armv7_request_interrupts(int *, int);
-void armv7_release_interrupts(int *, int);
+int armv7_request_interrupts(const int *, int);
+void armv7_release_interrupts(const int *, int);
 
 #endif
diff --git a/arch/arm/oprofile/op_model_xscale.c b/arch/arm/oprofile/op_model_xscale.c
index 724ab9ce2526..1d34a02048bd 100644
--- a/arch/arm/oprofile/op_model_xscale.c
+++ b/arch/arm/oprofile/op_model_xscale.c
@@ -17,12 +17,14 @@
 /* #define DEBUG */
 #include <linux/types.h>
 #include <linux/errno.h>
+#include <linux/err.h>
 #include <linux/sched.h>
 #include <linux/oprofile.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 
 #include <asm/cputype.h>
+#include <asm/pmu.h>
 
 #include "op_counter.h"
 #include "op_arm_model.h"
@@ -33,17 +35,6 @@
 #define PMU_RESET       (CCNT_RESET | PMN_RESET)
 #define PMU_CNT64       0x008   /* Make CCNT count every 64th cycle */
 
-/* TODO do runtime detection */
-#ifdef CONFIG_ARCH_IOP32X
-#define XSCALE_PMU_IRQ  IRQ_IOP32X_CORE_PMU
-#endif
-#ifdef CONFIG_ARCH_IOP33X
-#define XSCALE_PMU_IRQ  IRQ_IOP33X_CORE_PMU
-#endif
-#ifdef CONFIG_ARCH_PXA
-#define XSCALE_PMU_IRQ  IRQ_PMU
-#endif
-
 /*
  * Different types of events that can be counted by the XScale PMU
  * as used by Oprofile userspace. Here primarily for documentation
@@ -367,6 +358,8 @@ static irqreturn_t xscale_pmu_interrupt(int irq, void *arg)
         return IRQ_HANDLED;
 }
 
+static const struct pmu_irqs *pmu_irqs;
+
 static void xscale_pmu_stop(void)
 {
         u32 pmnc = read_pmnc();
@@ -374,20 +367,30 @@ static void xscale_pmu_stop(void)
         pmnc &= ~PMU_ENABLE;
         write_pmnc(pmnc);
 
-        free_irq(XSCALE_PMU_IRQ, results);
+        free_irq(pmu_irqs->irqs[0], results);
+        release_pmu(pmu_irqs);
+        pmu_irqs = NULL;
 }
 
 static int xscale_pmu_start(void)
 {
         int ret;
-        u32 pmnc = read_pmnc();
+        u32 pmnc;
+
+        pmu_irqs = reserve_pmu();
+        if (IS_ERR(pmu_irqs))
+                return PTR_ERR(pmu_irqs);
+
+        pmnc = read_pmnc();
 
-        ret = request_irq(XSCALE_PMU_IRQ, xscale_pmu_interrupt, IRQF_DISABLED,
-                        "XScale PMU", (void *)results);
+        ret = request_irq(pmu_irqs->irqs[0], xscale_pmu_interrupt,
+                          IRQF_DISABLED, "XScale PMU", (void *)results);
 
         if (ret < 0) {
                 printk(KERN_ERR "oprofile: unable to request IRQ%d for XScale PMU\n",
-                        XSCALE_PMU_IRQ);
+                       pmu_irqs->irqs[0]);
+                release_pmu(pmu_irqs);
+                pmu_irqs = NULL;
                 return ret;
         }