1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved. 4 * Copyright (c) 2023, Linaro Limited 5 * 6 * This driver supports what is known as "Master Stats v2" in Qualcomm 7 * downstream kernel terms, which seems to be the only version which has 8 * ever shipped, all the way from 2013 to 2023. 9 */ 10 11 #include <linux/debugfs.h> 12 #include <linux/io.h> 13 #include <linux/module.h> 14 #include <linux/of.h> 15 #include <linux/of_address.h> 16 #include <linux/platform_device.h> 17 18 struct master_stats_data { 19 void __iomem *base; 20 const char *label; 21 }; 22 23 struct rpm_master_stats { 24 u32 active_cores; 25 u32 num_shutdowns; 26 u64 shutdown_req; 27 u64 wakeup_idx; 28 u64 bringup_req; 29 u64 bringup_ack; 30 u32 wakeup_reason; /* 0 = "rude wakeup", 1 = scheduled wakeup */ 31 u32 last_sleep_trans_dur; 32 u32 last_wake_trans_dur; 33 34 /* Per-subsystem (*not necessarily* SoC-wide) XO shutdown stats */ 35 u32 xo_count; 36 u64 xo_last_enter; 37 u64 last_exit; 38 u64 xo_total_dur; 39 } __packed; 40 41 static int master_stats_show(struct seq_file *s, void *unused) 42 { 43 struct master_stats_data *data = s->private; 44 struct rpm_master_stats stat; 45 46 memcpy_fromio(&stat, data->base, sizeof(stat)); 47 48 seq_printf(s, "%s:\n", data->label); 49 50 seq_printf(s, "\tLast shutdown @ %llu\n", stat.shutdown_req); 51 seq_printf(s, "\tLast bringup req @ %llu\n", stat.bringup_req); 52 seq_printf(s, "\tLast bringup ack @ %llu\n", stat.bringup_ack); 53 seq_printf(s, "\tLast wakeup idx: %llu\n", stat.wakeup_idx); 54 seq_printf(s, "\tLast XO shutdown enter @ %llu\n", stat.xo_last_enter); 55 seq_printf(s, "\tLast XO shutdown exit @ %llu\n", stat.last_exit); 56 seq_printf(s, "\tXO total duration: %llu\n", stat.xo_total_dur); 57 seq_printf(s, "\tLast sleep transition duration: %u\n", stat.last_sleep_trans_dur); 58 seq_printf(s, "\tLast wake transition duration: %u\n", stat.last_wake_trans_dur); 59 seq_printf(s, "\tXO shutdown count: %u\n", stat.xo_count); 60 seq_printf(s, "\tWakeup reason: 0x%x\n", stat.wakeup_reason); 61 seq_printf(s, "\tShutdown count: %u\n", stat.num_shutdowns); 62 seq_printf(s, "\tActive cores bitmask: 0x%x\n", stat.active_cores); 63 64 return 0; 65 } 66 DEFINE_SHOW_ATTRIBUTE(master_stats); 67 68 static int master_stats_probe(struct platform_device *pdev) 69 { 70 struct device *dev = &pdev->dev; 71 struct master_stats_data *data; 72 struct device_node *msgram_np; 73 struct dentry *dent, *root; 74 struct resource res; 75 int count, i, ret; 76 77 count = of_property_count_strings(dev->of_node, "qcom,master-names"); 78 if (count < 0) 79 return count; 80 81 data = devm_kzalloc(dev, count * sizeof(*data), GFP_KERNEL); 82 if (!data) 83 return -ENOMEM; 84 85 root = debugfs_create_dir("qcom_rpm_master_stats", NULL); 86 platform_set_drvdata(pdev, root); 87 88 for (i = 0; i < count; i++) { 89 msgram_np = of_parse_phandle(dev->of_node, "qcom,rpm-msg-ram", i); 90 if (!msgram_np) { 91 debugfs_remove_recursive(root); 92 return dev_err_probe(dev, -ENODEV, 93 "Couldn't parse MSG RAM phandle idx %d", i); 94 } 95 96 /* 97 * Purposefully skip devm_platform helpers as we're using a 98 * shared resource. 99 */ 100 ret = of_address_to_resource(msgram_np, 0, &res); 101 of_node_put(msgram_np); 102 if (ret < 0) { 103 debugfs_remove_recursive(root); 104 return ret; 105 } 106 107 data[i].base = devm_ioremap(dev, res.start, resource_size(&res)); 108 if (!data[i].base) { 109 debugfs_remove_recursive(root); 110 return dev_err_probe(dev, -EINVAL, 111 "Could not map the MSG RAM slice idx %d!\n", i); 112 } 113 114 ret = of_property_read_string_index(dev->of_node, "qcom,master-names", i, 115 &data[i].label); 116 if (ret < 0) { 117 debugfs_remove_recursive(root); 118 return dev_err_probe(dev, ret, 119 "Could not read name idx %d!\n", i); 120 } 121 122 /* 123 * Generally it's not advised to fail on debugfs errors, but this 124 * driver's only job is exposing data therein. 125 */ 126 dent = debugfs_create_file(data[i].label, 0444, root, 127 &data[i], &master_stats_fops); 128 if (IS_ERR(dent)) { 129 debugfs_remove_recursive(root); 130 return dev_err_probe(dev, PTR_ERR(dent), 131 "Failed to create debugfs file %s!\n", data[i].label); 132 } 133 } 134 135 device_set_pm_not_required(dev); 136 137 return 0; 138 } 139 140 static void master_stats_remove(struct platform_device *pdev) 141 { 142 struct dentry *root = platform_get_drvdata(pdev); 143 144 debugfs_remove_recursive(root); 145 } 146 147 static const struct of_device_id rpm_master_table[] = { 148 { .compatible = "qcom,rpm-master-stats" }, 149 { }, 150 }; 151 152 static struct platform_driver master_stats_driver = { 153 .probe = master_stats_probe, 154 .remove_new = master_stats_remove, 155 .driver = { 156 .name = "qcom_rpm_master_stats", 157 .of_match_table = rpm_master_table, 158 }, 159 }; 160 module_platform_driver(master_stats_driver); 161 162 MODULE_DESCRIPTION("Qualcomm RPM Master Statistics driver"); 163 MODULE_LICENSE("GPL"); 164