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Commit 06fb8ec3 authored by Raghavendra Kakarla's avatar Raghavendra Kakarla
Browse files

drivers: qcom: Add sysfs node to enable/disable l2 reuse feature 



Add sysfs node to dynamically enable and disable the L2 reuse
feature.

Change-Id: I26da49edae6213e12815270c8ea6cf43be5e8371
Signed-off-by: default avatarRaghavendra Kakarla <rkakarla@codeaurora.org>
parent 44652454

drivers/soc/qcom/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -747,6 +747,14 @@ config MSM_SUSPEND_STATS_FIRST_BUCKET 
endif # MSM_IDLE_STATS

endif # MSM_PM



config QTI_L2_REUSE

	bool "Qualcomm Technologies Inc (QTI) L2 reuse"

	depends on ARCH_QCOM

	help

	  This module allows to configure the L2 reuse feature dynamically

	  to let the power collapsed cluster's L2 cache usage by the active

	  cluster cpu. Use sysfs interface to control enabling this feature.



config QTI_RPM_STATS_LOG

	bool "Qualcomm Technologies RPM Stats Driver"

	depends on QCOM_RPMH || MSM_RPM_SMD

drivers/soc/qcom/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -97,3 +97,4 @@ obj-$(CONFIG_ICNSS) += icnss.o 
obj-$(CONFIG_ICNSS_QMI) += icnss_qmi.o wlan_firmware_service_v01.o

obj-$(CONFIG_RMNET_CTL) += rmnet_ctl/

obj-$(CONFIG_QCOM_CX_IPEAK) += cx_ipeak.o

obj-$(CONFIG_QTI_L2_REUSE) += l2_reuse.o

drivers/soc/qcom/l2_reuse.c

0 → 100644
+71 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.

 */



#include <linux/arm-smccc.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/uaccess.h>

#include <linux/sysfs.h>

#include <linux/kobject.h>



#define L2_REUSE_SMC_ID 0x02001F01



static bool l2_reuse_enable = true;

static struct kobject *l2_reuse_kobj;



static ssize_t sysfs_show(struct kobject *kobj,

		struct kobj_attribute *attr, char *buf)

{

	return scnprintf(buf, PAGE_SIZE, "%u\n", l2_reuse_enable);

}



static ssize_t sysfs_store(struct kobject *kobj,

		struct kobj_attribute *attr, const char *buf, size_t count)

{

	struct arm_smccc_res res;

	int ret;



	ret = kstrtobool(buf, &l2_reuse_enable);

	if (ret) {

		pr_err("Invalid argument passed\n");

		return ret;

	}



	arm_smccc_smc(L2_REUSE_SMC_ID, l2_reuse_enable, 1, 0, 0, 0, 0, 0, &res);

	return count;

}



struct kobj_attribute l2_reuse_attr = __ATTR(l2_reuse_enable, 0660,

		sysfs_show, sysfs_store);



static int __init l2_reuse_driver_init(void)

{

	l2_reuse_kobj = kobject_create_and_add("l2_reuse_enable", power_kobj);



	if (!l2_reuse_kobj) {

		pr_info("kobj creation for l2_reuse failed\n");

		return 0;

	}



	if (sysfs_create_file(l2_reuse_kobj, &l2_reuse_attr.attr))

		kobject_put(l2_reuse_kobj);



	return 0;

}



void __exit l2_reuse_driver_exit(void)

{

	if (l2_reuse_kobj) {

		sysfs_remove_file(power_kobj, &l2_reuse_attr.attr);

		kobject_put(l2_reuse_kobj);

	}

}



module_init(l2_reuse_driver_init);

module_exit(l2_reuse_driver_exit);



MODULE_DESCRIPTION("Qualcomm Technologies Inc L2 REUSE Module");

MODULE_LICENSE("GPL v2");