drm/i915: fixup up debugfs rps state handling

[GitHub/MotorolaMobilityLLC/kernel-slsi.git] / drivers / gpu / drm / i915 / i915_debugfs.c

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 2e07cddd23131b5a1a22487a9e9a8d765929986b..d836bf8f0f626977bcd6512b8d696f37f107693d 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1691,10 +1691,18 @@ i915_max_freq_read(struct file *filp,
        struct drm_device *dev = filp->private_data;
        drm_i915_private_t *dev_priv = dev->dev_private;
        char buf[80];
-       int len;
+       int len, ret;
+
+       if (!(IS_GEN6(dev) || IS_GEN7(dev)))
+               return -ENODEV;
+
+       ret = mutex_lock_interruptible(&dev->struct_mutex);
+       if (ret)
+               return ret;
 
        len = snprintf(buf, sizeof(buf),
                       "max freq: %d\n", dev_priv->max_delay * 50);
+       mutex_unlock(&dev->struct_mutex);
 
        if (len > sizeof(buf))
                len = sizeof(buf);
@@ -1711,7 +1719,10 @@ i915_max_freq_write(struct file *filp,
        struct drm_device *dev = filp->private_data;
        struct drm_i915_private *dev_priv = dev->dev_private;
        char buf[20];
-       int val = 1;
+       int val = 1, ret;
+
+       if (!(IS_GEN6(dev) || IS_GEN7(dev)))
+               return -ENODEV;
 
        if (cnt > 0) {
                if (cnt > sizeof(buf) - 1)
@@ -1726,12 +1737,17 @@ i915_max_freq_write(struct file *filp,
 
        DRM_DEBUG_DRIVER("Manually setting max freq to %d\n", val);
 
+       ret = mutex_lock_interruptible(&dev->struct_mutex);
+       if (ret)
+               return ret;
+
        /*
         * Turbo will still be enabled, but won't go above the set value.
         */
        dev_priv->max_delay = val / 50;
 
        gen6_set_rps(dev, val / 50);
+       mutex_unlock(&dev->struct_mutex);
 
        return cnt;
 }
@@ -1751,10 +1767,18 @@ i915_min_freq_read(struct file *filp, char __user *ubuf, size_t max,
        struct drm_device *dev = filp->private_data;
        drm_i915_private_t *dev_priv = dev->dev_private;
        char buf[80];
-       int len;
+       int len, ret;
+
+       if (!(IS_GEN6(dev) || IS_GEN7(dev)))
+               return -ENODEV;
+
+       ret = mutex_lock_interruptible(&dev->struct_mutex);
+       if (ret)
+               return ret;
 
        len = snprintf(buf, sizeof(buf),
                       "min freq: %d\n", dev_priv->min_delay * 50);
+       mutex_unlock(&dev->struct_mutex);
 
        if (len > sizeof(buf))
                len = sizeof(buf);
@@ -1769,7 +1793,10 @@ i915_min_freq_write(struct file *filp, const char __user *ubuf, size_t cnt,
        struct drm_device *dev = filp->private_data;
        struct drm_i915_private *dev_priv = dev->dev_private;
        char buf[20];
-       int val = 1;
+       int val = 1, ret;
+
+       if (!(IS_GEN6(dev) || IS_GEN7(dev)))
+               return -ENODEV;
 
        if (cnt > 0) {
                if (cnt > sizeof(buf) - 1)
@@ -1784,12 +1811,17 @@ i915_min_freq_write(struct file *filp, const char __user *ubuf, size_t cnt,
 
        DRM_DEBUG_DRIVER("Manually setting min freq to %d\n", val);
 
+       ret = mutex_lock_interruptible(&dev->struct_mutex);
+       if (ret)
+               return ret;
+
        /*
         * Turbo will still be enabled, but won't go below the set value.
         */
        dev_priv->min_delay = val / 50;
 
        gen6_set_rps(dev, val / 50);
+       mutex_unlock(&dev->struct_mutex);
 
        return cnt;
 }
@@ -1814,6 +1846,9 @@ i915_cache_sharing_read(struct file *filp,
        u32 snpcr;
        int len;
 
+       if (!(IS_GEN6(dev) || IS_GEN7(dev)))
+               return -ENODEV;
+
        mutex_lock(&dev_priv->dev->struct_mutex);
        snpcr = I915_READ(GEN6_MBCUNIT_SNPCR);
        mutex_unlock(&dev_priv->dev->struct_mutex);
@@ -1840,6 +1875,9 @@ i915_cache_sharing_write(struct file *filp,
        u32 snpcr;
        int val = 1;
 
+       if (!(IS_GEN6(dev) || IS_GEN7(dev)))
+               return -ENODEV;
+
        if (cnt > 0) {
                if (cnt > sizeof(buf) - 1)
                        return -EINVAL;
@@ -2044,6 +2082,7 @@ int i915_debugfs_init(struct drm_minor *minor)
                                  &i915_cache_sharing_fops);
        if (ret)
                return ret;
+
        ret = i915_debugfs_create(minor->debugfs_root, minor,
                                  "i915_ring_stop",
                                  &i915_ring_stop_fops);