Commit 6d0efeb1 authored by Ilia Lin's avatar Ilia Lin Committed by Stephen Boyd
Browse files

soc: qcom: Separate kryo l2 accessors from PMU driver 



The driver provides kernel level API for other drivers
to access the MSM8996 L2 cache registers.
Separating the L2 access code from the PMU driver and
making it public to allow other drivers use it.
The accesses must be separated with a single spinlock,
maintained in this driver.

Signed-off-by: default avatarIlia Lin <ilialin@codeaurora.org>
Signed-off-by: default avatarLoic Poulain <loic.poulain@linaro.org>
Link: https://lore.kernel.org/r/1593766185-16346-2-git-send-email-loic.poulain@linaro.org


Acked-by: default avatarWill Deacon <will@kernel.org>
Signed-off-by: default avatarStephen Boyd <sboyd@kernel.org>
parent dbb988b4

drivers/perf/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -82,6 +82,7 @@ config FSL_IMX8_DDR_PMU 
config QCOM_L2_PMU

	bool "Qualcomm Technologies L2-cache PMU"

	depends on ARCH_QCOM && ARM64 && ACPI

	select QCOM_KRYO_L2_ACCESSORS

	  help

	  Provides support for the L2 cache performance monitor unit (PMU)

	  in Qualcomm Technologies processors.

drivers/perf/qcom_l2_pmu.c

+24 −66
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <asm/barrier.h>

#include <asm/local64.h>

#include <asm/sysreg.h>

#include <soc/qcom/kryo-l2-accessors.h>



#define MAX_L2_CTRS             9
@@ -79,8 +80,6 @@ 
#define L2_COUNTER_RELOAD       BIT_ULL(31)

#define L2_CYCLE_COUNTER_RELOAD BIT_ULL(63)



#define L2CPUSRSELR_EL1         sys_reg(3, 3, 15, 0, 6)

#define L2CPUSRDR_EL1           sys_reg(3, 3, 15, 0, 7)



#define reg_idx(reg, i)         (((i) * IA_L2_REG_OFFSET) + reg##_BASE)
@@ -99,48 +98,7 @@ 
#define L2_EVENT_STREX                     0x421

#define L2_EVENT_CLREX                     0x422



static DEFINE_RAW_SPINLOCK(l2_access_lock);



/**

 * set_l2_indirect_reg: write value to an L2 register

 * @reg: Address of L2 register.

 * @value: Value to be written to register.

 *

 * Use architecturally required barriers for ordering between system register

 * accesses

 */

static void set_l2_indirect_reg(u64 reg, u64 val)

{

	unsigned long flags;



	raw_spin_lock_irqsave(&l2_access_lock, flags);

	write_sysreg_s(reg, L2CPUSRSELR_EL1);

	isb();

	write_sysreg_s(val, L2CPUSRDR_EL1);

	isb();

	raw_spin_unlock_irqrestore(&l2_access_lock, flags);

}



/**

 * get_l2_indirect_reg: read an L2 register value

 * @reg: Address of L2 register.

 *

 * Use architecturally required barriers for ordering between system register

 * accesses

 */

static u64 get_l2_indirect_reg(u64 reg)

{

	u64 val;

	unsigned long flags;



	raw_spin_lock_irqsave(&l2_access_lock, flags);

	write_sysreg_s(reg, L2CPUSRSELR_EL1);

	isb();

	val = read_sysreg_s(L2CPUSRDR_EL1);

	raw_spin_unlock_irqrestore(&l2_access_lock, flags);



	return val;

}



struct cluster_pmu;
@@ -211,28 +169,28 @@ static inline struct cluster_pmu *get_cluster_pmu( 
static void cluster_pmu_reset(void)

{

	/* Reset all counters */

	set_l2_indirect_reg(L2PMCR, L2PMCR_RESET_ALL);

	set_l2_indirect_reg(L2PMCNTENCLR, l2_counter_present_mask);

	set_l2_indirect_reg(L2PMINTENCLR, l2_counter_present_mask);

	set_l2_indirect_reg(L2PMOVSCLR, l2_counter_present_mask);

	kryo_l2_set_indirect_reg(L2PMCR, L2PMCR_RESET_ALL);

	kryo_l2_set_indirect_reg(L2PMCNTENCLR, l2_counter_present_mask);

	kryo_l2_set_indirect_reg(L2PMINTENCLR, l2_counter_present_mask);

	kryo_l2_set_indirect_reg(L2PMOVSCLR, l2_counter_present_mask);

}



static inline void cluster_pmu_enable(void)

{

	set_l2_indirect_reg(L2PMCR, L2PMCR_COUNTERS_ENABLE);

	kryo_l2_set_indirect_reg(L2PMCR, L2PMCR_COUNTERS_ENABLE);

}



static inline void cluster_pmu_disable(void)

{

	set_l2_indirect_reg(L2PMCR, L2PMCR_COUNTERS_DISABLE);

	kryo_l2_set_indirect_reg(L2PMCR, L2PMCR_COUNTERS_DISABLE);

}



static inline void cluster_pmu_counter_set_value(u32 idx, u64 value)

{

	if (idx == l2_cycle_ctr_idx)

		set_l2_indirect_reg(L2PMCCNTR, value);

		kryo_l2_set_indirect_reg(L2PMCCNTR, value);

	else

		set_l2_indirect_reg(reg_idx(IA_L2PMXEVCNTR, idx), value);

		kryo_l2_set_indirect_reg(reg_idx(IA_L2PMXEVCNTR, idx), value);

}



static inline u64 cluster_pmu_counter_get_value(u32 idx)
@@ -240,46 +198,46 @@ static inline u64 cluster_pmu_counter_get_value(u32 idx) 
	u64 value;



	if (idx == l2_cycle_ctr_idx)

		value = get_l2_indirect_reg(L2PMCCNTR);

		value = kryo_l2_get_indirect_reg(L2PMCCNTR);

	else

		value = get_l2_indirect_reg(reg_idx(IA_L2PMXEVCNTR, idx));

		value = kryo_l2_get_indirect_reg(reg_idx(IA_L2PMXEVCNTR, idx));



	return value;

}



static inline void cluster_pmu_counter_enable(u32 idx)

{

	set_l2_indirect_reg(L2PMCNTENSET, idx_to_reg_bit(idx));

	kryo_l2_set_indirect_reg(L2PMCNTENSET, idx_to_reg_bit(idx));

}



static inline void cluster_pmu_counter_disable(u32 idx)

{

	set_l2_indirect_reg(L2PMCNTENCLR, idx_to_reg_bit(idx));

	kryo_l2_set_indirect_reg(L2PMCNTENCLR, idx_to_reg_bit(idx));

}



static inline void cluster_pmu_counter_enable_interrupt(u32 idx)

{

	set_l2_indirect_reg(L2PMINTENSET, idx_to_reg_bit(idx));

	kryo_l2_set_indirect_reg(L2PMINTENSET, idx_to_reg_bit(idx));

}



static inline void cluster_pmu_counter_disable_interrupt(u32 idx)

{

	set_l2_indirect_reg(L2PMINTENCLR, idx_to_reg_bit(idx));

	kryo_l2_set_indirect_reg(L2PMINTENCLR, idx_to_reg_bit(idx));

}



static inline void cluster_pmu_set_evccntcr(u32 val)

{

	set_l2_indirect_reg(L2PMCCNTCR, val);

	kryo_l2_set_indirect_reg(L2PMCCNTCR, val);

}



static inline void cluster_pmu_set_evcntcr(u32 ctr, u32 val)

{

	set_l2_indirect_reg(reg_idx(IA_L2PMXEVCNTCR, ctr), val);

	kryo_l2_set_indirect_reg(reg_idx(IA_L2PMXEVCNTCR, ctr), val);

}



static inline void cluster_pmu_set_evtyper(u32 ctr, u32 val)

{

	set_l2_indirect_reg(reg_idx(IA_L2PMXEVTYPER, ctr), val);

	kryo_l2_set_indirect_reg(reg_idx(IA_L2PMXEVTYPER, ctr), val);

}



static void cluster_pmu_set_resr(struct cluster_pmu *cluster,
@@ -295,11 +253,11 @@ static void cluster_pmu_set_resr(struct cluster_pmu *cluster, 


	spin_lock_irqsave(&cluster->pmu_lock, flags);



	resr_val = get_l2_indirect_reg(L2PMRESR);

	resr_val = kryo_l2_get_indirect_reg(L2PMRESR);

	resr_val &= ~(L2PMRESR_GROUP_MASK << shift);

	resr_val |= field;

	resr_val |= L2PMRESR_EN;

	set_l2_indirect_reg(L2PMRESR, resr_val);

	kryo_l2_set_indirect_reg(L2PMRESR, resr_val);



	spin_unlock_irqrestore(&cluster->pmu_lock, flags);

}
@@ -315,14 +273,14 @@ static inline void cluster_pmu_set_evfilter_sys_mode(u32 ctr) 
		   L2PMXEVFILTER_ORGFILTER_IDINDEP |

		   L2PMXEVFILTER_ORGFILTER_ALL;



	set_l2_indirect_reg(reg_idx(IA_L2PMXEVFILTER, ctr), val);

	kryo_l2_set_indirect_reg(reg_idx(IA_L2PMXEVFILTER, ctr), val);

}



static inline u32 cluster_pmu_getreset_ovsr(void)

{

	u32 result = get_l2_indirect_reg(L2PMOVSSET);

	u32 result = kryo_l2_get_indirect_reg(L2PMOVSSET);



	set_l2_indirect_reg(L2PMOVSCLR, result);

	kryo_l2_set_indirect_reg(L2PMOVSCLR, result);

	return result;

}
@@ -767,7 +725,7 @@ static int get_num_counters(void) 
{

	int val;



	val = get_l2_indirect_reg(L2PMCR);

	val = kryo_l2_get_indirect_reg(L2PMCR);



	/*

	 * Read number of counters from L2PMCR and add 1

drivers/soc/qcom/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -53,6 +53,10 @@ config QCOM_LLCC 
	  SDM845. This provides interfaces to clients that use the LLCC.

	  Say yes here to enable LLCC slice driver.



config QCOM_KRYO_L2_ACCESSORS

	bool

	depends on ARCH_QCOM && ARM64 || COMPILE_TEST



config QCOM_MDT_LOADER

	tristate

	select QCOM_SCM

drivers/soc/qcom/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -24,3 +24,4 @@ obj-$(CONFIG_QCOM_APR) += apr.o 
obj-$(CONFIG_QCOM_LLCC) += llcc-qcom.o

obj-$(CONFIG_QCOM_RPMHPD) += rpmhpd.o

obj-$(CONFIG_QCOM_RPMPD) += rpmpd.o

obj-$(CONFIG_QCOM_KRYO_L2_ACCESSORS) +=	kryo-l2-accessors.o

drivers/soc/qcom/kryo-l2-accessors.c

0 → 100644
+57 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (c) 2018, The Linux Foundation. All rights reserved.

 */



#include <linux/spinlock.h>

#include <asm/barrier.h>

#include <asm/sysreg.h>

#include <soc/qcom/kryo-l2-accessors.h>



#define L2CPUSRSELR_EL1         sys_reg(3, 3, 15, 0, 6)

#define L2CPUSRDR_EL1           sys_reg(3, 3, 15, 0, 7)



static DEFINE_RAW_SPINLOCK(l2_access_lock);



/**

 * kryo_l2_set_indirect_reg() - write value to an L2 register

 * @reg: Address of L2 register.

 * @value: Value to be written to register.

 *

 * Use architecturally required barriers for ordering between system register

 * accesses, and system registers with respect to device memory

 */

void kryo_l2_set_indirect_reg(u64 reg, u64 val)

{

	unsigned long flags;



	raw_spin_lock_irqsave(&l2_access_lock, flags);

	write_sysreg_s(reg, L2CPUSRSELR_EL1);

	isb();

	write_sysreg_s(val, L2CPUSRDR_EL1);

	isb();

	raw_spin_unlock_irqrestore(&l2_access_lock, flags);

}

EXPORT_SYMBOL(kryo_l2_set_indirect_reg);



/**

 * kryo_l2_get_indirect_reg() - read an L2 register value

 * @reg: Address of L2 register.

 *

 * Use architecturally required barriers for ordering between system register

 * accesses, and system registers with respect to device memory

 */

u64 kryo_l2_get_indirect_reg(u64 reg)

{

	u64 val;

	unsigned long flags;



	raw_spin_lock_irqsave(&l2_access_lock, flags);

	write_sysreg_s(reg, L2CPUSRSELR_EL1);

	isb();

	val = read_sysreg_s(L2CPUSRDR_EL1);

	raw_spin_unlock_irqrestore(&l2_access_lock, flags);



	return val;

}

EXPORT_SYMBOL(kryo_l2_get_indirect_reg);

CRA Git | Maintained and supported by SUSTech CRA and CCSE