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authorBen Skeggs <bskeggs@redhat.com>2013-10-15 05:52:56 +0400
committerBen Skeggs <bskeggs@redhat.com>2013-11-08 09:40:18 +0400
commit26fdd78cce3f51a49e1f2d3ad27ee893a28d220e (patch)
treeceacd5963b798bc65e9d045b830564b627a6f84a /drivers/gpu/drm/nouveau/nouveau_sysfs.c
parent9838366c1597dfd8fe5663ad02024adce2fa07fe (diff)
downloadlinux-26fdd78cce3f51a49e1f2d3ad27ee893a28d220e.tar.xz
drm/nouveau: implement a simple sysfs interface to new pm code
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_sysfs.c')
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_sysfs.c162
1 files changed, 162 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_sysfs.c b/drivers/gpu/drm/nouveau/nouveau_sysfs.c
new file mode 100644
index 000000000000..89201a17ce75
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_sysfs.c
@@ -0,0 +1,162 @@
+/*
+ * 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 <bskeggs@redhat.com>
+ */
+
+#include "nouveau_sysfs.h"
+
+#include <core/object.h>
+#include <core/class.h>
+
+static inline struct drm_device *
+drm_device(struct device *d)
+{
+ return pci_get_drvdata(to_pci_dev(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 nv_control_pstate_info info;
+ size_t cnt = PAGE_SIZE;
+ char *buf = b;
+ int ret, i;
+
+ ret = nv_exec(sysfs->ctrl, NV_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 :
+ NV_CONTROL_PSTATE_ATTR_STATE_CURRENT;
+ struct nv_control_pstate_attr attr = {
+ .state = state,
+ .index = 0,
+ };
+
+ ret = nv_exec(sysfs->ctrl, NV_CONTROL_PSTATE_ATTR,
+ &attr, sizeof(attr));
+ if (ret)
+ return ret;
+
+ if (i < info.count)
+ snappendf(buf, cnt, "%02x:", attr.state);
+ else
+ snappendf(buf, cnt, "--:");
+
+ attr.index = 0;
+ do {
+ attr.state = state;
+ ret = nv_exec(sysfs->ctrl, NV_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 && info.pstate == state) ||
+ (state < 0 && info.ustate < 0))
+ snappendf(buf, cnt, " *");
+ 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 nv_control_pstate_user args;
+ long value, ret;
+ char *tmp;
+
+ if ((tmp = strchr(buf, '\n')))
+ *tmp = '\0';
+
+ if (!strcasecmp(buf, "none"))
+ args.state = NV_CONTROL_PSTATE_USER_STATE_UNKNOWN;
+ else
+ if (!strcasecmp(buf, "auto"))
+ args.state = NV_CONTROL_PSTATE_USER_STATE_PERFMON;
+ else {
+ ret = kstrtol(buf, 16, &value);
+ if (ret)
+ return ret;
+ args.state = value;
+ }
+
+ ret = nv_exec(sysfs->ctrl, NV_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);
+
+ if (sysfs->ctrl) {
+ device_remove_file(&dev->pdev->dev, &dev_attr_pstate);
+ nouveau_object_del(nv_object(drm), NVDRM_DEVICE, NVDRM_CONTROL);
+ }
+
+ drm->sysfs = NULL;
+ kfree(sysfs);
+}
+
+int
+nouveau_sysfs_init(struct drm_device *dev)
+{
+ struct nouveau_drm *drm = nouveau_drm(dev);
+ struct nouveau_sysfs *sysfs;
+ int ret;
+
+ sysfs = drm->sysfs = kzalloc(sizeof(*sysfs), GFP_KERNEL);
+ if (!sysfs)
+ return -ENOMEM;
+
+ ret = nouveau_object_new(nv_object(drm), NVDRM_DEVICE, NVDRM_CONTROL,
+ NV_CONTROL_CLASS, NULL, 0, &sysfs->ctrl);
+ if (ret == 0)
+ device_create_file(&dev->pdev->dev, &dev_attr_pstate);
+
+ return 0;
+}