[PATCH 35/49] drm/i915: Allocate an integer ID for each new file descriptor

[oscar.mateo@xxxxxxxxx]

From: Oscar Mateo <oscar.mateo@xxxxxxxxx>

Since context IDs are not globally unique anymore (they are only unique
for a given file descriptor), we can use the new file_priv ID in
combination with the context ID to unequivocally refer to a context.

The ID 0 remains to be used internally by i915 (meaning no file_priv).

Signed-off-by: Oscar Mateo <oscar.mateo@xxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_dma.c | 14 +++++++++++---
 drivers/gpu/drm/i915/i915_drv.h |  3 +++
 drivers/gpu/drm/i915/i915_gem.c |  9 +++++++++
 3 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index ea5d965..7188403 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1567,6 +1567,8 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 	device_info = (struct intel_device_info *)&dev_priv->info;
 	*device_info = *info;
 
+	idr_init(&dev_priv->filepriv_idr);
+
 	spin_lock_init(&dev_priv->irq_lock);
 	spin_lock_init(&dev_priv->gpu_error.lock);
 	spin_lock_init(&dev_priv->backlight_lock);
@@ -1867,6 +1869,8 @@ int i915_driver_unload(struct drm_device *dev)
 	if (dev_priv->slab)
 		kmem_cache_destroy(dev_priv->slab);
 
+	idr_destroy(&dev_priv->filepriv_idr);
+
 	pci_dev_put(dev_priv->bridge_dev);
 	kfree(dev->dev_private);
 
@@ -1917,11 +1921,15 @@ void i915_driver_lastclose(struct drm_device * dev)
 	i915_dma_cleanup(dev);
 }
 
-void i915_driver_preclose(struct drm_device * dev, struct drm_file *file_priv)
+void i915_driver_preclose(struct drm_device * dev, struct drm_file *file)
 {
+	drm_i915_private_t *dev_priv = dev->dev_private;
+	struct drm_i915_file_private *file_priv = file->driver_priv;
+
 	mutex_lock(&dev->struct_mutex);
-	i915_gem_context_close(dev, file_priv);
-	i915_gem_release(dev, file_priv);
+	idr_remove(&dev_priv->filepriv_idr, file_priv->id);
+	i915_gem_context_close(dev, file);
+	i915_gem_release(dev, file);
 	mutex_unlock(&dev->struct_mutex);
 }
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index a9f807b..2f6e55d 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1268,6 +1268,8 @@ typedef struct drm_i915_private {
 
 	const struct intel_device_info info;
 
+	struct idr filepriv_idr;
+
 	int relative_constants_mode;
 
 	void __iomem *regs;
@@ -1676,6 +1678,7 @@ struct drm_i915_gem_request {
 struct drm_i915_file_private {
 	struct drm_i915_private *dev_priv;
 	struct drm_file *file;
+	int id;
 
 	struct {
 		spinlock_t lock;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index e844c50..07d88847 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4879,6 +4879,7 @@ i915_gem_file_idle_work_handler(struct work_struct *work)
 
 int i915_gem_open(struct drm_device *dev, struct drm_file *file)
 {
+	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_i915_file_private *file_priv;
 	int ret;
 
@@ -4892,6 +4893,14 @@ int i915_gem_open(struct drm_device *dev, struct drm_file *file)
 	file_priv->dev_priv = dev->dev_private;
 	file_priv->file = file;
 
+	ret = idr_alloc(&dev_priv->filepriv_idr, file_priv, 0, 0, GFP_KERNEL);
+	if (ret < 0) {
+		kfree(file_priv);
+		return ret;
+	}
+
+	file_priv->id = ret;
+
 	spin_lock_init(&file_priv->mm.lock);
 	INIT_LIST_HEAD(&file_priv->mm.request_list);
 	INIT_DELAYED_WORK(&file_priv->mm.idle_work,
-- 
1.9.0

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