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drm/i915: allow the existing error_state to be destroyed 

... by writing (anything) to i915_error_state.

This way we can simulate a bunch of gpu hangs and run the error_state
capture code every time (without the need to reload the module).

To make that happen we need to abandon the simple seq_file wrappers
provided by the drm core. While at it put the new error_state
refcounting to some good use and associated the error_state to the
debugfs when opening the file. Otherwise the error_state could change
while someone is reading it. This should help greatly when we finally
get around to split up the giant single seq_file block that the
error_state file currently is into smaller parts.

v2: Actually squash all the fixes into the patch ...

Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2012-04-27 15:17:40 +02:00
parent 742cbee804
commit d54423037f
1 changed files with 77 additions and 13 deletions
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90
drivers/gpu/drm/i915/i915_debugfs.c
View File

@ -688,21 +688,19 @@ static void i915_ring_error_state(struct seq_file *m,
seq_printf(m, " ring->tail: 0x%08x\n", error->cpu_ring_tail[ring]);
}
struct i915_error_state_file_priv {
struct drm_device *dev;
struct drm_i915_error_state *error;
};
static int i915_error_state(struct seq_file *m, void *unused)
{
struct drm_info_node *node = (struct drm_info_node *) m->private;
struct drm_device *dev = node->minor->dev;
struct i915_error_state_file_priv *error_priv = m->private;
struct drm_device *dev = error_priv->dev;
drm_i915_private_t *dev_priv = dev->dev_private;
struct drm_i915_error_state *error;
unsigned long flags;
struct drm_i915_error_state *error = error_priv->error;
int i, j, page, offset, elt;
spin_lock_irqsave(&dev_priv->error_lock, flags);
error = dev_priv->first_error;
if (error)
kref_get(&error->ref);
spin_unlock_irqrestore(&dev_priv->error_lock, flags);
if (!error) {
seq_printf(m, "no error state collected\n");
return 0;
@ -790,11 +788,71 @@ static int i915_error_state(struct seq_file *m, void *unused)
if (error->display)
intel_display_print_error_state(m, dev, error->display);
kref_put(&error->ref, i915_error_state_free);
return 0;
}
static ssize_t
i915_error_state_write(struct file *filp,
const char __user *ubuf,
size_t cnt,
loff_t *ppos)
{
struct seq_file *m = filp->private_data;
struct i915_error_state_file_priv *error_priv = m->private;
struct drm_device *dev = error_priv->dev;
DRM_DEBUG_DRIVER("Resetting error state\n");
mutex_lock(&dev->struct_mutex);
i915_destroy_error_state(dev);
mutex_unlock(&dev->struct_mutex);
return cnt;
}
static int i915_error_state_open(struct inode *inode, struct file *file)
{
struct drm_device *dev = inode->i_private;
drm_i915_private_t *dev_priv = dev->dev_private;
struct i915_error_state_file_priv *error_priv;
unsigned long flags;
error_priv = kzalloc(sizeof(*error_priv), GFP_KERNEL);
if (!error_priv)
return -ENOMEM;
error_priv->dev = dev;
spin_lock_irqsave(&dev_priv->error_lock, flags);
error_priv->error = dev_priv->first_error;
if (error_priv->error)
kref_get(&error_priv->error->ref);
spin_unlock_irqrestore(&dev_priv->error_lock, flags);
return single_open(file, i915_error_state, error_priv);
}
static int i915_error_state_release(struct inode *inode, struct file *file)
{
struct seq_file *m = file->private_data;
struct i915_error_state_file_priv *error_priv = m->private;
if (error_priv->error)
kref_put(&error_priv->error->ref, i915_error_state_free);
kfree(error_priv);
return single_release(inode, file);
}
static const struct file_operations i915_error_state_fops = {
.owner = THIS_MODULE,
.open = i915_error_state_open,
.read = seq_read,
.write = i915_error_state_write,
.llseek = default_llseek,
.release = i915_error_state_release,
};
static int i915_rstdby_delays(struct seq_file *m, void *unused)
{
struct drm_info_node *node = (struct drm_info_node *) m->private;
@ -1646,6 +1704,7 @@ static const struct file_operations i915_ring_stop_fops = {
.write = i915_ring_stop_write,
.llseek = default_llseek,
};
static ssize_t
i915_max_freq_read(struct file *filp,
char __user *ubuf,
@ -1900,7 +1959,6 @@ static struct drm_info_list i915_debugfs_list[] = {
{"i915_gem_hws", i915_hws_info, 0, (void *)RCS},
{"i915_gem_hws_blt", i915_hws_info, 0, (void *)BCS},
{"i915_gem_hws_bsd", i915_hws_info, 0, (void *)VCS},
{"i915_error_state", i915_error_state, 0},
{"i915_rstdby_delays", i915_rstdby_delays, 0},
{"i915_cur_delayinfo", i915_cur_delayinfo, 0},
{"i915_delayfreq_table", i915_delayfreq_table, 0},
@ -1952,6 +2010,12 @@ int i915_debugfs_init(struct drm_minor *minor)
if (ret)
return ret;
ret = i915_debugfs_create(minor->debugfs_root, minor,
"i915_error_state",
&i915_error_state_fops);
if (ret)
return ret;
return drm_debugfs_create_files(i915_debugfs_list,
I915_DEBUGFS_ENTRIES,
minor->debugfs_root, minor);