[Intel-gfx] [PATCH 15/16] drm/i915: Only one open() allowed on pipe CRC result files

[Damien Lespiau]

It doesn't really make sense to have two processes dequeueing the CRC
values at the same time. Forbid that usage.

Signed-off-by: Damien Lespiau <damien.lesp...@intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 16 ++++++++++++++++
 drivers/gpu/drm/i915/i915_drv.h     |  1 +
 2 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c 
b/drivers/gpu/drm/i915/i915_debugfs.c
index 5137f8f..826ebce 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1768,6 +1768,15 @@ struct pipe_crc_info {
 
 static int i915_pipe_crc_open(struct inode *inode, struct file *filep)
 {
+       struct pipe_crc_info *info = inode->i_private;
+       struct drm_i915_private *dev_priv = info->dev->dev_private;
+       struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[info->pipe];
+
+       if (!atomic_dec_and_test(&pipe_crc->available)) {
+               atomic_inc(&pipe_crc->available);
+               return -EBUSY; /* already open */
+       }
+
        filep->private_data = inode->i_private;
 
        return 0;
@@ -1775,6 +1784,12 @@ static int i915_pipe_crc_open(struct inode *inode, 
struct file *filep)
 
 static int i915_pipe_crc_release(struct inode *inode, struct file *filep)
 {
+       struct pipe_crc_info *info = inode->i_private;
+       struct drm_i915_private *dev_priv = info->dev->dev_private;
+       struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[info->pipe];
+
+       atomic_inc(&pipe_crc->available); /* release the device */
+
        return 0;
 }
 
@@ -2684,6 +2699,7 @@ void intel_display_crc_init(struct drm_device *dev)
        for (i = 0; i < INTEL_INFO(dev)->num_pipes; i++) {
                struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[i];
 
+               atomic_set(&pipe_crc->available, 1);
                init_waitqueue_head(&pipe_crc->wq);
        }
 }
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index e16cf1e..3206358 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1234,6 +1234,7 @@ struct intel_pipe_crc_entry {
 
 #define INTEL_PIPE_CRC_ENTRIES_NR      128
 struct intel_pipe_crc {
+       atomic_t available;             /* exclusive access to the device */
        struct intel_pipe_crc_entry *entries;
        enum intel_pipe_crc_source source;
        atomic_t head, tail;
-- 
1.8.3.1

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