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Commit e5d73f69 authored by Samantha Tran's avatar Samantha Tran
Browse files

drm/msm/sde: set minimum restriction on max_bw_high debugfs 



This change sets a minimum value to max_bw_high. Input from
debugfs must be greater than or equal to the minimum or else
it will be set to the minimum value.

Change-Id: Id6c830d9665ec84d1eb5b41dee9274cad1596419
Signed-off-by: default avatarSamantha Tran <samtran@codeaurora.org>
parent 6304c587

drivers/gpu/drm/msm/sde/sde_core_perf.c

+66 −3
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.

 * Copyright (c) 2016-2019, The Linux Foundation. All rights reserved.

 */



#define pr_fmt(fmt)	"[drm:%s:%d] " fmt, __func__, __LINE__
@@ -24,6 +24,7 @@ 
#include "sde_core_perf.h"



#define SDE_PERF_MODE_STRING_SIZE	128

#define SDE_PERF_THRESHOLD_HIGH_MIN     12800000



static DEFINE_MUTEX(sde_core_perf_lock);
@@ -977,6 +978,62 @@ void sde_core_perf_crtc_update(struct drm_crtc *crtc, 


#ifdef CONFIG_DEBUG_FS



static ssize_t _sde_core_perf_threshold_high_write(struct file *file,

		    const char __user *user_buf, size_t count, loff_t *ppos)

{

	struct sde_core_perf *perf = file->private_data;

	u32 threshold_high = 0;

	char buf[10];



	if (!perf)

		return -ENODEV;



	if (count >= sizeof(buf))

		return -EFAULT;



	if (copy_from_user(buf, user_buf, count))

		return -EFAULT;



	buf[count] = 0;	/* end of string */



	if (kstrtouint(buf, 0, &threshold_high))

		return -EFAULT;



	if (threshold_high < SDE_PERF_THRESHOLD_HIGH_MIN)

		threshold_high = SDE_PERF_THRESHOLD_HIGH_MIN;



	perf->catalog->perf.max_bw_high = threshold_high;



	return count;

}



static ssize_t _sde_core_perf_threshold_high_read(struct file *file,

			char __user *buff, size_t count, loff_t *ppos)

{

	struct sde_core_perf *perf = file->private_data;

	int len = 0;

	char buf[20] = {'\0'};



	if (!perf)

		return -ENODEV;



	if (*ppos)

		return 0;	/* the end */



	len = snprintf(buf, sizeof(buf),

			"%d\n", perf->catalog->perf.max_bw_high);



	if (len < 0 || len >= sizeof(buf))

		return 0;



	if ((count < sizeof(buf)) || copy_to_user(buff, buf, len))

		return -EFAULT;



	*ppos += len;   /* increase offset */



	return len;

}



static ssize_t _sde_core_perf_mode_write(struct file *file,

		    const char __user *user_buf, size_t count, loff_t *ppos)

{
@@ -1050,6 +1107,12 @@ static ssize_t _sde_core_perf_mode_read(struct file *file, 
	return len;

}



static const struct file_operations sde_core_perf_threshold_high_fops = {

	.open = simple_open,

	.read = _sde_core_perf_threshold_high_read,

	.write = _sde_core_perf_threshold_high_write,

};



static const struct file_operations sde_core_perf_mode_fops = {

	.open = simple_open,

	.read = _sde_core_perf_mode_read,
@@ -1089,8 +1152,8 @@ int sde_core_perf_debugfs_init(struct sde_core_perf *perf, 
			&perf->core_clk_rate);

	debugfs_create_u32("threshold_low", 0600, perf->debugfs_root,

			(u32 *)&catalog->perf.max_bw_low);

	debugfs_create_u32("threshold_high", 0600, perf->debugfs_root,

			(u32 *)&catalog->perf.max_bw_high);

	debugfs_create_file("threshold_high", 0600, perf->debugfs_root,

			(u32 *)perf, &sde_core_perf_threshold_high_fops);

	debugfs_create_u32("min_core_ib", 0600, perf->debugfs_root,

			(u32 *)&catalog->perf.min_core_ib);

	debugfs_create_u32("min_llcc_ib", 0600, perf->debugfs_root,