139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <soc/qcom/rpm-smd.h>
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#define RPM_MISC_REQ_TYPE 0x6373696d
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#define RPM_MISC_REQ_DDR_HEALTH 0x31726464
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static uint32_t mem_size;
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static int ddr_health_set(const char *val, struct kernel_param *kp);
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module_param_call(mem_size, ddr_health_set, param_get_uint,
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&mem_size, 0644);
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struct ddr_health {
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uint64_t addr;
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uint32_t size;
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uint32_t reserved;
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};
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static struct mutex lock;
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static struct ddr_health *ddr_health;
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static struct msm_rpm_kvp rpm_kvp;
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static int ddr_health_set(const char *val, struct kernel_param *kp)
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{
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int ret;
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void *virt;
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uint64_t old_addr = 0;
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uint32_t old_size = 0;
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mutex_lock(&lock);
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ret = param_set_uint(val, kp);
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if (ret) {
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pr_err("ddr-health: error setting value %d\n", ret);
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mutex_unlock(&lock);
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return ret;
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}
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if (rpm_kvp.data) {
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ddr_health = (struct ddr_health *)rpm_kvp.data;
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old_addr = ddr_health->addr;
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old_size = ddr_health->size;
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}
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rpm_kvp.key = RPM_MISC_REQ_DDR_HEALTH;
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if (mem_size) {
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virt = kzalloc(mem_size, GFP_KERNEL);
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if (!virt) {
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pr_err("ddr-health: failed to alloc mem request %x\n",
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mem_size);
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mutex_unlock(&lock);
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return -ENOMEM;
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}
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ddr_health->addr = (uint64_t)virt_to_phys(virt);
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ddr_health->size = mem_size;
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rpm_kvp.length = sizeof(struct ddr_health);
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rpm_kvp.data = (void *)ddr_health;
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ret = msm_rpm_send_message(MSM_RPM_CTX_ACTIVE_SET,
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RPM_MISC_REQ_TYPE, 0, &rpm_kvp, 1);
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if (ret) {
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pr_err("ddr-health: send buf to RPM failed %d, %x\n",
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ret, mem_size);
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kfree(virt);
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goto err;
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}
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} else {
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ddr_health->addr = 0;
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ddr_health->size = 0;
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rpm_kvp.length = sizeof(struct ddr_health);
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rpm_kvp.data = (void *)ddr_health;
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ret = msm_rpm_send_message(MSM_RPM_CTX_ACTIVE_SET,
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RPM_MISC_REQ_TYPE, 0, &rpm_kvp, 1);
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if (ret) {
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pr_err("ddr-health: send nobuf to RPM failed %d, %x\n",
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ret, mem_size);
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goto err;
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}
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}
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if (old_addr)
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kfree(phys_to_virt((phys_addr_t)old_addr));
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mutex_unlock(&lock);
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return 0;
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err:
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ddr_health->addr = old_addr;
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ddr_health->size = old_size;
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mutex_unlock(&lock);
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return ret;
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}
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static int __init ddr_health_init(void)
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{
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mutex_init(&lock);
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ddr_health = kzalloc(sizeof(*ddr_health), GFP_KERNEL);
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if (!ddr_health) {
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pr_err("ddr-health: failed to alloc mem\n");
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return -ENOMEM;
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}
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return 0;
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}
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module_init(ddr_health_init);
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static void __exit ddr_health_exit(void)
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{
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if (rpm_kvp.data) {
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ddr_health = (struct ddr_health *)rpm_kvp.data;
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if (ddr_health->addr)
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kfree(phys_to_virt((phys_addr_t)ddr_health->addr));
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}
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kfree(ddr_health);
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mutex_destroy(&lock);
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}
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module_exit(ddr_health_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("DDR health monitor driver");
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