drivers/gpu/drm/nouveau/nouveau_sysfs.c

   1 /*
   2  * Copyright 2013 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Ben Skeggs <bskeggs@redhat.com>
  23  */
  24
  25 #include "nouveau_sysfs.h"
  26
  27 #include <core/object.h>
  28 #include <core/class.h>
  29
  30 static inline struct drm_device *
  31 drm_device(struct device *d)
  32 {
  33         return pci_get_drvdata(to_pci_dev(d));
  34 }
  35
  36 #define snappendf(p,r,f,a...) do {                                             \
  37         snprintf(p, r, f, ##a);                                                \
  38         r -= strlen(p);                                                        \
  39         p += strlen(p);                                                        \
  40 } while(0)
  41
  42 static ssize_t
  43 nouveau_sysfs_pstate_get(struct device *d, struct device_attribute *a, char *b)
  44 {
  45         struct nouveau_sysfs *sysfs = nouveau_sysfs(drm_device(d));
  46         struct nv_control_pstate_info info;
  47         size_t cnt = PAGE_SIZE;
  48         char *buf = b;
  49         int ret, i;
  50
  51         ret = nv_exec(sysfs->ctrl, NV_CONTROL_PSTATE_INFO, &info, sizeof(info));
  52         if (ret)
  53                 return ret;
  54
  55         for (i = 0; i < info.count + 1; i++) {
  56                 const s32 state = i < info.count ? i :
  57                         NV_CONTROL_PSTATE_ATTR_STATE_CURRENT;
  58                 struct nv_control_pstate_attr attr = {
  59                         .state = state,
  60                         .index = 0,
  61                 };
  62
  63                 ret = nv_exec(sysfs->ctrl, NV_CONTROL_PSTATE_ATTR,
  64                              &attr, sizeof(attr));
  65                 if (ret)
  66                         return ret;
  67
  68                 if (i < info.count)
  69                         snappendf(buf, cnt, "%02x:", attr.state);
  70                 else
  71                         snappendf(buf, cnt, "--:");
  72
  73                 attr.index = 0;
  74                 do {
  75                         attr.state = state;
  76                         ret = nv_exec(sysfs->ctrl, NV_CONTROL_PSTATE_ATTR,
  77                                      &attr, sizeof(attr));
  78                         if (ret)
  79                                 return ret;
  80
  81                         snappendf(buf, cnt, " %s %d", attr.name, attr.min);
  82                         if (attr.min != attr.max)
  83                                 snappendf(buf, cnt, "-%d", attr.max);
  84                         snappendf(buf, cnt, " %s", attr.unit);
  85                 } while (attr.index);
  86
  87                 if ((state >= 0 && info.pstate == state) ||
  88                     (state <  0 && info.ustate < 0))
  89                         snappendf(buf, cnt, " *");
  90                 snappendf(buf, cnt, "\n");
  91         }
  92
  93         return strlen(b);
  94 }
  95
  96 static ssize_t
  97 nouveau_sysfs_pstate_set(struct device *d, struct device_attribute *a,
  98                          const char *buf, size_t count)
  99 {
 100         struct nouveau_sysfs *sysfs = nouveau_sysfs(drm_device(d));
 101         struct nv_control_pstate_user args;
 102         long value, ret;
 103         char *tmp;
 104
 105         if ((tmp = strchr(buf, '\n')))
 106                 *tmp = '\0';
 107
 108         if (!strcasecmp(buf, "none"))
 109                 args.state = NV_CONTROL_PSTATE_USER_STATE_UNKNOWN;
 110         else
 111         if (!strcasecmp(buf, "auto"))
 112                 args.state = NV_CONTROL_PSTATE_USER_STATE_PERFMON;
 113         else {
 114                 ret = kstrtol(buf, 16, &value);
 115                 if (ret)
 116                         return ret;
 117                 args.state = value;
 118         }
 119
 120         ret = nv_exec(sysfs->ctrl, NV_CONTROL_PSTATE_USER, &args, sizeof(args));
 121         if (ret < 0)
 122                 return ret;
 123
 124         return count;
 125 }
 126
 127 static DEVICE_ATTR(pstate, S_IRUGO | S_IWUSR,
 128                    nouveau_sysfs_pstate_get, nouveau_sysfs_pstate_set);
 129
 130 void
 131 nouveau_sysfs_fini(struct drm_device *dev)
 132 {
 133         struct nouveau_sysfs *sysfs = nouveau_sysfs(dev);
 134         struct nouveau_drm *drm = nouveau_drm(dev);
 135
 136         if (sysfs->ctrl) {
 137                 device_remove_file(&dev->pdev->dev, &dev_attr_pstate);
 138                 nouveau_object_del(nv_object(drm), NVDRM_DEVICE, NVDRM_CONTROL);
 139         }
 140
 141         drm->sysfs = NULL;
 142         kfree(sysfs);
 143 }
 144
 145 int
 146 nouveau_sysfs_init(struct drm_device *dev)
 147 {
 148         struct nouveau_drm *drm = nouveau_drm(dev);
 149         struct nouveau_sysfs *sysfs;
 150         int ret;
 151
 152         sysfs = drm->sysfs = kzalloc(sizeof(*sysfs), GFP_KERNEL);
 153         if (!sysfs)
 154                 return -ENOMEM;
 155
 156         ret = nouveau_object_new(nv_object(drm), NVDRM_DEVICE, NVDRM_CONTROL,
 157                                  NV_CONTROL_CLASS, NULL, 0, &sysfs->ctrl);
 158         if (ret == 0)
 159                 device_create_file(&dev->pdev->dev, &dev_attr_pstate);
 160
 161         return 0;
 162 }