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[linux.git] / 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/amba/bus.h>
10 #include <linux/bitops.h>
11 #include <linux/io.h>
12 #include <linux/coresight.h>
13 #include <linux/pm_runtime.h>
14
15 extern struct mutex coresight_mutex;
16 extern const struct device_type coresight_dev_type[];
17
18 /*
19  * Coresight management registers (0xf00-0xfcc)
20  * 0xfa0 - 0xfa4: Management    registers in PFTv1.0
21  *                Trace         registers in PFTv1.1
22  */
23 #define CORESIGHT_ITCTRL        0xf00
24 #define CORESIGHT_CLAIMSET      0xfa0
25 #define CORESIGHT_CLAIMCLR      0xfa4
26 #define CORESIGHT_LAR           0xfb0
27 #define CORESIGHT_LSR           0xfb4
28 #define CORESIGHT_DEVARCH       0xfbc
29 #define CORESIGHT_AUTHSTATUS    0xfb8
30 #define CORESIGHT_DEVID         0xfc8
31 #define CORESIGHT_DEVTYPE       0xfcc
32
33
34 /*
35  * Coresight device CLAIM protocol.
36  * See PSCI - ARM DEN 0022D, Section: 6.8.1 Debug and Trace save and restore.
37  */
38 #define CORESIGHT_CLAIM_SELF_HOSTED     BIT(1)
39
40 #define TIMEOUT_US              100
41 #define BMVAL(val, lsb, msb)    ((val & GENMASK(msb, lsb)) >> lsb)
42
43 #define ETM_MODE_EXCL_KERN      BIT(30)
44 #define ETM_MODE_EXCL_USER      BIT(31)
45 #define ETM_MODE_EXCL_HOST      BIT(32)
46 #define ETM_MODE_EXCL_GUEST     BIT(33)
47
48 struct cs_pair_attribute {
49         struct device_attribute attr;
50         u32 lo_off;
51         u32 hi_off;
52 };
53
54 struct cs_off_attribute {
55         struct device_attribute attr;
56         u32 off;
57 };
58
59 extern ssize_t coresight_simple_show32(struct device *_dev,
60                                      struct device_attribute *attr, char *buf);
61 extern ssize_t coresight_simple_show_pair(struct device *_dev,
62                                      struct device_attribute *attr, char *buf);
63
64 #define coresight_simple_reg32(name, offset)                            \
65         (&((struct cs_off_attribute[]) {                                \
66            {                                                            \
67                 __ATTR(name, 0444, coresight_simple_show32, NULL),      \
68                 offset                                                  \
69            }                                                            \
70         })[0].attr.attr)
71
72 #define coresight_simple_reg64(name, lo_off, hi_off)                    \
73         (&((struct cs_pair_attribute[]) {                               \
74            {                                                            \
75                 __ATTR(name, 0444, coresight_simple_show_pair, NULL),   \
76                 lo_off, hi_off                                          \
77            }                                                            \
78         })[0].attr.attr)
79
80 extern const u32 coresight_barrier_pkt[4];
81 #define CORESIGHT_BARRIER_PKT_SIZE (sizeof(coresight_barrier_pkt))
82
83 enum etm_addr_type {
84         ETM_ADDR_TYPE_NONE,
85         ETM_ADDR_TYPE_SINGLE,
86         ETM_ADDR_TYPE_RANGE,
87         ETM_ADDR_TYPE_START,
88         ETM_ADDR_TYPE_STOP,
89 };
90
91 /**
92  * struct cs_buffer - keep track of a recording session' specifics
93  * @cur:        index of the current buffer
94  * @nr_pages:   max number of pages granted to us
95  * @pid:        PID this cs_buffer belongs to
96  * @offset:     offset within the current buffer
97  * @data_size:  how much we collected in this run
98  * @snapshot:   is this run in snapshot mode
99  * @data_pages: a handle the ring buffer
100  */
101 struct cs_buffers {
102         unsigned int            cur;
103         unsigned int            nr_pages;
104         pid_t                   pid;
105         unsigned long           offset;
106         local_t                 data_size;
107         bool                    snapshot;
108         void                    **data_pages;
109 };
110
111 static inline void coresight_insert_barrier_packet(void *buf)
112 {
113         if (buf)
114                 memcpy(buf, coresight_barrier_pkt, CORESIGHT_BARRIER_PKT_SIZE);
115 }
116
117 static inline void CS_LOCK(void __iomem *addr)
118 {
119         do {
120                 /* Wait for things to settle */
121                 mb();
122                 writel_relaxed(0x0, addr + CORESIGHT_LAR);
123         } while (0);
124 }
125
126 static inline void CS_UNLOCK(void __iomem *addr)
127 {
128         do {
129                 writel_relaxed(CORESIGHT_UNLOCK, addr + CORESIGHT_LAR);
130                 /* Make sure everyone has seen this */
131                 mb();
132         } while (0);
133 }
134
135 void coresight_disable_path(struct list_head *path);
136 int coresight_enable_path(struct list_head *path, enum cs_mode mode,
137                           void *sink_data);
138 struct coresight_device *coresight_get_sink(struct list_head *path);
139 struct coresight_device *coresight_get_sink_by_id(u32 id);
140 struct coresight_device *
141 coresight_find_default_sink(struct coresight_device *csdev);
142 struct list_head *coresight_build_path(struct coresight_device *csdev,
143                                        struct coresight_device *sink);
144 void coresight_release_path(struct list_head *path);
145 int coresight_add_sysfs_link(struct coresight_sysfs_link *info);
146 void coresight_remove_sysfs_link(struct coresight_sysfs_link *info);
147 int coresight_create_conns_sysfs_group(struct coresight_device *csdev);
148 void coresight_remove_conns_sysfs_group(struct coresight_device *csdev);
149 int coresight_make_links(struct coresight_device *orig,
150                          struct coresight_connection *conn,
151                          struct coresight_device *target);
152 void coresight_remove_links(struct coresight_device *orig,
153                             struct coresight_connection *conn);
154 u32 coresight_get_sink_id(struct coresight_device *csdev);
155
156 #if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM3X)
157 extern int etm_readl_cp14(u32 off, unsigned int *val);
158 extern int etm_writel_cp14(u32 off, u32 val);
159 #else
160 static inline int etm_readl_cp14(u32 off, unsigned int *val) { return 0; }
161 static inline int etm_writel_cp14(u32 off, u32 val) { return 0; }
162 #endif
163
164 struct cti_assoc_op {
165         void (*add)(struct coresight_device *csdev);
166         void (*remove)(struct coresight_device *csdev);
167 };
168
169 extern void coresight_set_cti_ops(const struct cti_assoc_op *cti_op);
170 extern void coresight_remove_cti_ops(void);
171
172 /*
173  * Macros and inline functions to handle CoreSight UCI data and driver
174  * private data in AMBA ID table entries, and extract data values.
175  */
176
177 /* coresight AMBA ID, no UCI, no driver data: id table entry */
178 #define CS_AMBA_ID(pid)                 \
179         {                               \
180                 .id     = pid,          \
181                 .mask   = 0x000fffff,   \
182         }
183
184 /* coresight AMBA ID, UCI with driver data only: id table entry. */
185 #define CS_AMBA_ID_DATA(pid, dval)                              \
186         {                                                       \
187                 .id     = pid,                                  \
188                 .mask   = 0x000fffff,                           \
189                 .data   =  (void *)&(struct amba_cs_uci_id)     \
190                         {                               \
191                                 .data = (void *)dval,   \
192                         }                               \
193         }
194
195 /* coresight AMBA ID, full UCI structure: id table entry. */
196 #define __CS_AMBA_UCI_ID(pid, m, uci_ptr)       \
197         {                                       \
198                 .id     = pid,                  \
199                 .mask   = m,                    \
200                 .data   = (void *)uci_ptr       \
201         }
202 #define CS_AMBA_UCI_ID(pid, uci)        __CS_AMBA_UCI_ID(pid, 0x000fffff, uci)
203 /*
204  * PIDR2[JEDEC], BIT(3) must be 1 (Read As One) to indicate that rest of the
205  * PIDR1, PIDR2 DES_* fields follow JEDEC encoding for the designer. Use that
206  * as a match value for blanket matching all devices in the given CoreSight
207  * device type and architecture.
208  */
209 #define PIDR2_JEDEC                     BIT(3)
210 #define PID_PIDR2_JEDEC                 (PIDR2_JEDEC << 16)
211 /*
212  * Match all PIDs in a given CoreSight device type and architecture, defined
213  * by the uci.
214  */
215 #define CS_AMBA_MATCH_ALL_UCI(uci)                                      \
216         __CS_AMBA_UCI_ID(PID_PIDR2_JEDEC, PID_PIDR2_JEDEC, uci)
217
218 /* extract the data value from a UCI structure given amba_id pointer. */
219 static inline void *coresight_get_uci_data(const struct amba_id *id)
220 {
221         struct amba_cs_uci_id *uci_id = id->data;
222
223         if (!uci_id)
224                 return NULL;
225
226         return uci_id->data;
227 }
228
229 static inline void *coresight_get_uci_data_from_amba(const struct amba_id *table, u32 pid)
230 {
231         while (table->mask) {
232                 if ((pid & table->mask) == table->id)
233                         return coresight_get_uci_data(table);
234                 table++;
235         };
236         return NULL;
237 }
238
239 void coresight_release_platform_data(struct coresight_device *csdev,
240                                      struct device *dev,
241                                      struct coresight_platform_data *pdata);
242 struct coresight_device *
243 coresight_find_csdev_by_fwnode(struct fwnode_handle *r_fwnode);
244 void coresight_add_helper(struct coresight_device *csdev,
245                           struct coresight_device *helper);
246
247 void coresight_set_percpu_sink(int cpu, struct coresight_device *csdev);
248 struct coresight_device *coresight_get_percpu_sink(int cpu);
249 void coresight_disable_source(struct coresight_device *csdev, void *data);
250
251 #endif
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