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drm: Protect dev->filelist with its own mutex 

amdgpu gained dev->struct_mutex usage, and that's because it's walking
the dev->filelist list. Protect that list with it's own lock to take
one more step towards getting rid of struct_mutex usage in drivers
once and for all.

While doing the conversion I noticed that 2 debugfs files in i915
completely lacked appropriate locking. Fix that up too.

v2: don't forget to switch to drm_gem_object_unreference_unlocked.

Cc: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1461691808-12414-9-git-send-email-daniel.vetter@ffwll.ch
hifive-unleashed-5.1
Daniel Vetter 2016-04-26 19:29:41 +02:00
parent f47dbdd75b
commit 1d2ac403ae
6 changed files with 25 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
View File

@ -93,7 +93,7 @@ void amdgpu_gem_force_release(struct amdgpu_device *adev)
struct drm_device *ddev = adev->ddev;
struct drm_file *file;
mutex_lock(&ddev->struct_mutex);
mutex_lock(&ddev->filelist_mutex);
list_for_each_entry(file, &ddev->filelist, lhead) {
struct drm_gem_object *gobj;
@ -103,13 +103,13 @@ void amdgpu_gem_force_release(struct amdgpu_device *adev)
spin_lock(&file->table_lock);
idr_for_each_entry(&file->object_idr, gobj, handle) {
WARN_ONCE(1, "And also active allocations!\n");
drm_gem_object_unreference(gobj);
drm_gem_object_unreference_unlocked(gobj);
}
idr_destroy(&file->object_idr);
spin_unlock(&file->table_lock);
}
mutex_unlock(&ddev->struct_mutex);
mutex_unlock(&ddev->filelist_mutex);
}
/*
@ -769,7 +769,7 @@ static int amdgpu_debugfs_gem_info(struct seq_file *m, void *data)
struct drm_file *file;
int r;
r = mutex_lock_interruptible(&dev->struct_mutex);
r = mutex_lock_interruptible(&dev->filelist_mutex);
if (r)
return r;
@ -793,7 +793,7 @@ static int amdgpu_debugfs_gem_info(struct seq_file *m, void *data)
spin_unlock(&file->table_lock);
}
mutex_unlock(&dev->struct_mutex);
mutex_unlock(&dev->filelist_mutex);
return 0;
}

1
drivers/gpu/drm/drm_drv.c
View File

@ -590,6 +590,7 @@ struct drm_device *drm_dev_alloc(struct drm_driver *driver,
spin_lock_init(&dev->buf_lock);
spin_lock_init(&dev->event_lock);
mutex_init(&dev->struct_mutex);
mutex_init(&dev->filelist_mutex);
mutex_init(&dev->ctxlist_mutex);
mutex_init(&dev->master_mutex);

9
drivers/gpu/drm/drm_fops.c
View File

@ -297,9 +297,9 @@ static int drm_open_helper(struct file *filp, struct drm_minor *minor)
}
mutex_unlock(&dev->master_mutex);
mutex_lock(&dev->struct_mutex);
mutex_lock(&dev->filelist_mutex);
list_add(&priv->lhead, &dev->filelist);
mutex_unlock(&dev->struct_mutex);
mutex_unlock(&dev->filelist_mutex);
#ifdef __alpha__
/*
@ -447,8 +447,11 @@ int drm_release(struct inode *inode, struct file *filp)
DRM_DEBUG("open_count = %d\n", dev->open_count);
mutex_lock(&dev->struct_mutex);
mutex_lock(&dev->filelist_mutex);
list_del(&file_priv->lhead);
mutex_unlock(&dev->filelist_mutex);
mutex_lock(&dev->struct_mutex);
if (file_priv->magic)
idr_remove(&file_priv->master->magic_map, file_priv->magic);
mutex_unlock(&dev->struct_mutex);

4
drivers/gpu/drm/drm_info.c
View File

@ -174,7 +174,7 @@ int drm_clients_info(struct seq_file *m, void *data)
/* dev->filelist is sorted youngest first, but we want to present
* oldest first (i.e. kernel, servers, clients), so walk backwardss.
*/
mutex_lock(&dev->struct_mutex);
mutex_lock(&dev->filelist_mutex);
list_for_each_entry_reverse(priv, &dev->filelist, lhead) {
struct task_struct *task;
@ -190,7 +190,7 @@ int drm_clients_info(struct seq_file *m, void *data)
priv->magic);
rcu_read_unlock();
}
mutex_unlock(&dev->struct_mutex);
mutex_unlock(&dev->filelist_mutex);
return 0;
}

12
drivers/gpu/drm/i915/i915_debugfs.c
View File

@ -498,6 +498,10 @@ static int i915_gem_object_info(struct seq_file *m, void* data)
seq_putc(m, '\n');
print_batch_pool_stats(m, dev_priv);
mutex_unlock(&dev->struct_mutex);
mutex_lock(&dev->filelist_mutex);
list_for_each_entry_reverse(file, &dev->filelist, lhead) {
struct file_stats stats;
struct task_struct *task;
@ -518,8 +522,7 @@ static int i915_gem_object_info(struct seq_file *m, void* data)
print_file_stats(m, task ? task->comm : "<unknown>", stats);
rcu_read_unlock();
}
mutex_unlock(&dev->struct_mutex);
mutex_unlock(&dev->filelist_mutex);
return 0;
}
@ -2325,6 +2328,7 @@ static int i915_ppgtt_info(struct seq_file *m, void *data)
else if (INTEL_INFO(dev)->gen >= 6)
gen6_ppgtt_info(m, dev);
mutex_lock(&dev->filelist_mutex);
list_for_each_entry_reverse(file, &dev->filelist, lhead) {
struct drm_i915_file_private *file_priv = file->driver_priv;
struct task_struct *task;
@ -2339,6 +2343,7 @@ static int i915_ppgtt_info(struct seq_file *m, void *data)
idr_for_each(&file_priv->context_idr, per_file_ctx,
(void *)(unsigned long)m);
}
mutex_unlock(&dev->filelist_mutex);
out_put:
intel_runtime_pm_put(dev_priv);
@ -2374,6 +2379,8 @@ static int i915_rps_boost_info(struct seq_file *m, void *data)
intel_gpu_freq(dev_priv, dev_priv->rps.min_freq_softlimit),
intel_gpu_freq(dev_priv, dev_priv->rps.max_freq_softlimit),
intel_gpu_freq(dev_priv, dev_priv->rps.max_freq));
mutex_lock(&dev->filelist_mutex);
spin_lock(&dev_priv->rps.client_lock);
list_for_each_entry_reverse(file, &dev->filelist, lhead) {
struct drm_i915_file_private *file_priv = file->driver_priv;
@ -2396,6 +2403,7 @@ static int i915_rps_boost_info(struct seq_file *m, void *data)
list_empty(&dev_priv->rps.mmioflips.link) ? "" : ", active");
seq_printf(m, "Kernel boosts: %d\n", dev_priv->rps.boosts);
spin_unlock(&dev_priv->rps.client_lock);
mutex_unlock(&dev->filelist_mutex);
return 0;
}

1
include/drm/drmP.h
View File

@ -769,6 +769,7 @@ struct drm_device {
atomic_t buf_alloc; /**< Buffer allocation in progress */
/*@} */
struct mutex filelist_mutex;
struct list_head filelist;
/** \name Memory management */