drivers/hwtracing/coresight/coresight-priv.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #ifndef _CORESIGHT_PRIV_H
   7 #define _CORESIGHT_PRIV_H
   8
   9 #include <linux/bitops.h>
  10 #include <linux/io.h>
  11 #include <linux/coresight.h>
  12 #include <linux/pm_runtime.h>
  13
  14 /*
  15  * Coresight management registers (0xf00-0xfcc)
  16  * 0xfa0 - 0xfa4: Management    registers in PFTv1.0
  17  *                Trace         registers in PFTv1.1
  18  */
  19 #define CORESIGHT_ITCTRL        0xf00
  20 #define CORESIGHT_CLAIMSET      0xfa0
  21 #define CORESIGHT_CLAIMCLR      0xfa4
  22 #define CORESIGHT_LAR           0xfb0
  23 #define CORESIGHT_LSR           0xfb4
  24 #define CORESIGHT_AUTHSTATUS    0xfb8
  25 #define CORESIGHT_DEVID         0xfc8
  26 #define CORESIGHT_DEVTYPE       0xfcc
  27
  28 #define TIMEOUT_US              100
  29 #define BMVAL(val, lsb, msb)    ((val & GENMASK(msb, lsb)) >> lsb)
  30
  31 #define ETM_MODE_EXCL_KERN      BIT(30)
  32 #define ETM_MODE_EXCL_USER      BIT(31)
  33
  34 typedef u32 (*coresight_read_fn)(const struct device *, u32 offset);
  35 #define __coresight_simple_func(type, func, name, lo_off, hi_off)       \
  36 static ssize_t name##_show(struct device *_dev,                         \
  37                            struct device_attribute *attr, char *buf)    \
  38 {                                                                       \
  39         type *drvdata = dev_get_drvdata(_dev->parent);                  \
  40         coresight_read_fn fn = func;                                    \
  41         u64 val;                                                        \
  42         pm_runtime_get_sync(_dev->parent);                              \
  43         if (fn)                                                         \
  44                 val = (u64)fn(_dev->parent, lo_off);                    \
  45         else                                                            \
  46                 val = coresight_read_reg_pair(drvdata->base,            \
  47                                                  lo_off, hi_off);       \
  48         pm_runtime_put_sync(_dev->parent);                              \
  49         return scnprintf(buf, PAGE_SIZE, "0x%llx\n", val);              \
  50 }                                                                       \
  51 static DEVICE_ATTR_RO(name)
  52
  53 #define coresight_simple_func(type, func, name, offset)                 \
  54         __coresight_simple_func(type, func, name, offset, -1)
  55 #define coresight_simple_reg32(type, name, offset)                      \
  56         __coresight_simple_func(type, NULL, name, offset, -1)
  57 #define coresight_simple_reg64(type, name, lo_off, hi_off)              \
  58         __coresight_simple_func(type, NULL, name, lo_off, hi_off)
  59
  60 extern const u32 barrier_pkt[4];
  61 #define CORESIGHT_BARRIER_PKT_SIZE (sizeof(barrier_pkt))
  62
  63 enum etm_addr_type {
  64         ETM_ADDR_TYPE_NONE,
  65         ETM_ADDR_TYPE_SINGLE,
  66         ETM_ADDR_TYPE_RANGE,
  67         ETM_ADDR_TYPE_START,
  68         ETM_ADDR_TYPE_STOP,
  69 };
  70
  71 enum cs_mode {
  72         CS_MODE_DISABLED,
  73         CS_MODE_SYSFS,
  74         CS_MODE_PERF,
  75 };
  76
  77 /**
  78  * struct cs_buffer - keep track of a recording session' specifics
  79  * @cur:        index of the current buffer
  80  * @nr_pages:   max number of pages granted to us
  81  * @offset:     offset within the current buffer
  82  * @data_size:  how much we collected in this run
  83  * @snapshot:   is this run in snapshot mode
  84  * @data_pages: a handle the ring buffer
  85  */
  86 struct cs_buffers {
  87         unsigned int            cur;
  88         unsigned int            nr_pages;
  89         unsigned long           offset;
  90         local_t                 data_size;
  91         bool                    snapshot;
  92         void                    **data_pages;
  93 };
  94
  95 static inline void coresight_insert_barrier_packet(void *buf)
  96 {
  97         if (buf)
  98                 memcpy(buf, barrier_pkt, CORESIGHT_BARRIER_PKT_SIZE);
  99 }
 100
 101
 102 static inline void CS_LOCK(void __iomem *addr)
 103 {
 104         do {
 105                 /* Wait for things to settle */
 106                 mb();
 107                 writel_relaxed(0x0, addr + CORESIGHT_LAR);
 108         } while (0);
 109 }
 110
 111 static inline void CS_UNLOCK(void __iomem *addr)
 112 {
 113         do {
 114                 writel_relaxed(CORESIGHT_UNLOCK, addr + CORESIGHT_LAR);
 115                 /* Make sure everyone has seen this */
 116                 mb();
 117         } while (0);
 118 }
 119
 120 static inline u64
 121 coresight_read_reg_pair(void __iomem *addr, s32 lo_offset, s32 hi_offset)
 122 {
 123         u64 val;
 124
 125         val = readl_relaxed(addr + lo_offset);
 126         val |= (hi_offset < 0) ? 0 :
 127                (u64)readl_relaxed(addr + hi_offset) << 32;
 128         return val;
 129 }
 130
 131 static inline void coresight_write_reg_pair(void __iomem *addr, u64 val,
 132                                                  s32 lo_offset, s32 hi_offset)
 133 {
 134         writel_relaxed((u32)val, addr + lo_offset);
 135         if (hi_offset >= 0)
 136                 writel_relaxed((u32)(val >> 32), addr + hi_offset);
 137 }
 138
 139 void coresight_disable_path(struct list_head *path);
 140 int coresight_enable_path(struct list_head *path, u32 mode);
 141 struct coresight_device *coresight_get_sink(struct list_head *path);
 142 struct coresight_device *coresight_get_enabled_sink(bool reset);
 143 struct list_head *coresight_build_path(struct coresight_device *csdev,
 144                                        struct coresight_device *sink);
 145 void coresight_release_path(struct list_head *path);
 146
 147 #ifdef CONFIG_CORESIGHT_SOURCE_ETM3X
 148 extern int etm_readl_cp14(u32 off, unsigned int *val);
 149 extern int etm_writel_cp14(u32 off, u32 val);
 150 #else
 151 static inline int etm_readl_cp14(u32 off, unsigned int *val) { return 0; }
 152 static inline int etm_writel_cp14(u32 off, u32 val) { return 0; }
 153 #endif
 154
 155 #endif