drivers/hwtracing/stm/stm.h

   1 /*
   2  * System Trace Module (STM) infrastructure
   3  * Copyright (c) 2014, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * STM class implements generic infrastructure for  System Trace Module devices
  15  * as defined in MIPI STPv2 specification.
  16  */
  17
  18 #ifndef _STM_STM_H_
  19 #define _STM_STM_H_
  20
  21 struct stp_policy;
  22 struct stp_policy_node;
  23
  24 struct stp_policy_node *
  25 stp_policy_node_lookup(struct stm_device *stm, char *s);
  26 void stp_policy_node_put(struct stp_policy_node *policy_node);
  27 void stp_policy_unbind(struct stp_policy *policy);
  28
  29 void stp_policy_node_get_ranges(struct stp_policy_node *policy_node,
  30                                 unsigned int *mstart, unsigned int *mend,
  31                                 unsigned int *cstart, unsigned int *cend);
  32 int stp_configfs_init(void);
  33 void stp_configfs_exit(void);
  34
  35 struct stp_master {
  36         unsigned int    nr_free;
  37         unsigned long   chan_map[0];
  38 };
  39
  40 struct stm_device {
  41         struct device           dev;
  42         struct module           *owner;
  43         struct stp_policy       *policy;
  44         struct mutex            policy_mutex;
  45         int                     major;
  46         unsigned int            sw_nmasters;
  47         struct stm_data         *data;
  48         struct mutex            link_mutex;
  49         spinlock_t              link_lock;
  50         struct list_head        link_list;
  51         /* master allocation */
  52         spinlock_t              mc_lock;
  53         struct stp_master       *masters[0];
  54 };
  55
  56 #define to_stm_device(_d)                               \
  57         container_of((_d), struct stm_device, dev)
  58
  59 struct stm_output {
  60         spinlock_t              lock;
  61         unsigned int            master;
  62         unsigned int            channel;
  63         unsigned int            nr_chans;
  64 };
  65
  66 struct stm_file {
  67         struct stm_device       *stm;
  68         struct stp_policy_node  *policy_node;
  69         struct stm_output       output;
  70 };
  71
  72 struct stm_device *stm_find_device(const char *name);
  73 void stm_put_device(struct stm_device *stm);
  74
  75 struct stm_source_device {
  76         struct device           dev;
  77         struct stm_source_data  *data;
  78         spinlock_t              link_lock;
  79         struct stm_device __rcu *link;
  80         struct list_head        link_entry;
  81         /* one output per stm_source device */
  82         struct stp_policy_node  *policy_node;
  83         struct stm_output       output;
  84 };
  85
  86 #define to_stm_source_device(_d)                                \
  87         container_of((_d), struct stm_source_device, dev)
  88
  89 #endif /* _STM_STM_H_ */