/* * Copyright 2013 Red Hat Inc. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Authors: Ben Skeggs */ #include #include #include #include #include "nouveau_sysfs.h" MODULE_PARM_DESC(pstate, "enable sysfs pstate file, which will be moved in the future"); int nouveau_pstate; module_param_named(pstate, nouveau_pstate, int, 0400); static inline struct drm_device * drm_device(struct device *d) { return dev_get_drvdata(d); } #define snappendf(p,r,f,a...) do { \ snprintf(p, r, f, ##a); \ r -= strlen(p); \ p += strlen(p); \ } while(0) static ssize_t nouveau_sysfs_pstate_get(struct device *d, struct device_attribute *a, char *b) { struct nouveau_sysfs *sysfs = nouveau_sysfs(drm_device(d)); struct nvif_control_pstate_info_v0 info = {}; size_t cnt = PAGE_SIZE; char *buf = b; int ret, i; ret = nvif_mthd(&sysfs->ctrl, NVIF_CONTROL_PSTATE_INFO, &info, sizeof(info)); if (ret) return ret; for (i = 0; i < info.count + 1; i++) { const s32 state = i < info.count ? i : NVIF_CONTROL_PSTATE_ATTR_V0_STATE_CURRENT; struct nvif_control_pstate_attr_v0 attr = { .state = state, .index = 0, }; ret = nvif_mthd(&sysfs->ctrl, NVIF_CONTROL_PSTATE_ATTR, &attr, sizeof(attr)); if (ret) return ret; if (i < info.count) snappendf(buf, cnt, "%02x:", attr.state); else snappendf(buf, cnt, "%s:", info.pwrsrc == 0 ? "DC" : info.pwrsrc == 1 ? "AC" : "--"); attr.index = 0; do { attr.state = state; ret = nvif_mthd(&sysfs->ctrl, NVIF_CONTROL_PSTATE_ATTR, &attr, sizeof(attr)); if (ret) return ret; snappendf(buf, cnt, " %s %d", attr.name, attr.min); if (attr.min != attr.max) snappendf(buf, cnt, "-%d", attr.max); snappendf(buf, cnt, " %s", attr.unit); } while (attr.index); if (state >= 0) { if (info.ustate_ac == state) snappendf(buf, cnt, " AC"); if (info.ustate_dc == state) snappendf(buf, cnt, " DC"); if (info.pstate == state) snappendf(buf, cnt, " *"); } else { if (info.ustate_ac < -1) snappendf(buf, cnt, " AC"); if (info.ustate_dc < -1) snappendf(buf, cnt, " DC"); } snappendf(buf, cnt, "\n"); } return strlen(b); } static ssize_t nouveau_sysfs_pstate_set(struct device *d, struct device_attribute *a, const char *buf, size_t count) { struct nouveau_sysfs *sysfs = nouveau_sysfs(drm_device(d)); struct nvif_control_pstate_user_v0 args = { .pwrsrc = -EINVAL }; long value, ret; char *tmp; if ((tmp = strchr(buf, '\n'))) *tmp = '\0'; if (!strncasecmp(buf, "dc:", 3)) { args.pwrsrc = 0; buf += 3; } else if (!strncasecmp(buf, "ac:", 3)) { args.pwrsrc = 1; buf += 3; } if (!strcasecmp(buf, "none")) args.ustate = NVIF_CONTROL_PSTATE_USER_V0_STATE_UNKNOWN; else if (!strcasecmp(buf, "auto")) args.ustate = NVIF_CONTROL_PSTATE_USER_V0_STATE_PERFMON; else { ret = kstrtol(buf, 16, &value); if (ret) return ret; args.ustate = value; } ret = nvif_mthd(&sysfs->ctrl, NVIF_CONTROL_PSTATE_USER, &args, sizeof(args)); if (ret < 0) return ret; return count; } static DEVICE_ATTR(pstate, S_IRUGO | S_IWUSR, nouveau_sysfs_pstate_get, nouveau_sysfs_pstate_set); void nouveau_sysfs_fini(struct drm_device *dev) { struct nouveau_sysfs *sysfs = nouveau_sysfs(dev); struct nouveau_drm *drm = nouveau_drm(dev); struct nvif_device *device = &drm->device; if (sysfs && sysfs->ctrl.priv) { device_remove_file(nvxx_device(device)->dev, &dev_attr_pstate); nvif_object_fini(&sysfs->ctrl); } drm->sysfs = NULL; kfree(sysfs); } int nouveau_sysfs_init(struct drm_device *dev) { struct nouveau_drm *drm = nouveau_drm(dev); struct nvif_device *device = &drm->device; struct nouveau_sysfs *sysfs; int ret; if (!nouveau_pstate) return 0; sysfs = drm->sysfs = kzalloc(sizeof(*sysfs), GFP_KERNEL); if (!sysfs) return -ENOMEM; ret = nvif_object_init(&device->object, 0, NVIF_CLASS_CONTROL, NULL, 0, &sysfs->ctrl); if (ret == 0) device_create_file(nvxx_device(device)->dev, &dev_attr_pstate); return 0; }