drm/i915/context: create & destroy ioctls

Add the interfaces to allow user space to create and destroy contexts.
Contexts are destroyed automatically if the file descriptor for the dri
device is closed.

Following convention as usual here causes checkpatch warnings.

v2: with is_initialized, no longer need to init at create
drop the context switch on create (daniel)

v3: Use interruptible lock (Chris)
return -ENODEV in !GEM case (Chris)

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>

4 files changed, 76 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 3f3aca8c376..ba75af12f1f 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1848,6 +1848,8 @@ struct drm_ioctl_desc i915_ioctls[] = {
         DRM_IOCTL_DEF_DRV(I915_SET_SPRITE_COLORKEY, intel_sprite_set_colorkey, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
         DRM_IOCTL_DEF_DRV(I915_GET_SPRITE_COLORKEY, intel_sprite_get_colorkey, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
         DRM_IOCTL_DEF_DRV(I915_GEM_WAIT, i915_gem_wait_ioctl, DRM_AUTH|DRM_UNLOCKED),
+        DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_CREATE, i915_gem_context_create_ioctl, DRM_UNLOCKED),
+        DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_DESTROY, i915_gem_context_destroy_ioctl, DRM_UNLOCKED),
 };
 
 int i915_max_ioctl = DRM_ARRAY_SIZE(i915_ioctls);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 6edc02b6dda..03e7f9e683e 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1386,6 +1386,10 @@ void i915_gem_context_open(struct drm_device *dev, struct drm_file *file);
 void i915_gem_context_close(struct drm_device *dev, struct drm_file *file);
 int i915_switch_context(struct intel_ring_buffer *ring,
                         struct drm_file *file, int to_id);
+int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
+                                  struct drm_file *file);
+int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data,
+                                   struct drm_file *file);
 
 /* i915_gem_gtt.c */
 int __must_check i915_gem_init_aliasing_ppgtt(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 6a7b67d9f43..5642c4019b5 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -489,3 +489,58 @@ int i915_switch_context(struct intel_ring_buffer *ring,
                 drm_gem_object_unreference(&from_obj->base);
         return ret;
 }
+
+int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
+                                  struct drm_file *file)
+{
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        struct drm_i915_gem_context_create *args = data;
+        struct drm_i915_file_private *file_priv = file->driver_priv;
+        struct i915_hw_context *ctx;
+        int ret;
+
+        if (!(dev->driver->driver_features & DRIVER_GEM))
+                return -ENODEV;
+
+        ret = i915_mutex_lock_interruptible(dev);
+        if (ret)
+                return ret;
+
+        ret = create_hw_context(dev, file_priv, &ctx);
+        mutex_unlock(&dev->struct_mutex);
+
+        args->ctx_id = ctx->id;
+        DRM_DEBUG_DRIVER("HW context %d created\n", args->ctx_id);
+
+        return ret;
+}
+
+int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data,
+                                   struct drm_file *file)
+{
+        struct drm_i915_gem_context_destroy *args = data;
+        struct drm_i915_file_private *file_priv = file->driver_priv;
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        struct i915_hw_context *ctx;
+        int ret;
+
+        if (!(dev->driver->driver_features & DRIVER_GEM))
+                return -ENODEV;
+
+        ret = i915_mutex_lock_interruptible(dev);
+        if (ret)
+                return ret;
+
+        ctx = i915_gem_context_get(file_priv, args->ctx_id);
+        if (!ctx) {
+                mutex_unlock(&dev->struct_mutex);
+                return -EINVAL;
+        }
+
+        do_destroy(ctx);
+
+        mutex_unlock(&dev->struct_mutex);
+
+        DRM_DEBUG_DRIVER("HW context %d destroyed\n", args->ctx_id);
+        return 0;
+}
diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h
index 5c28ee1d191..5da73244486 100644
--- a/include/drm/i915_drm.h
+++ b/include/drm/i915_drm.h
@@ -201,6 +201,8 @@ typedef struct _drm_i915_sarea {
 #define DRM_I915_GET_SPRITE_COLORKEY    0x2a
 #define DRM_I915_SET_SPRITE_COLORKEY    0x2b
 #define DRM_I915_GEM_WAIT       0x2c
+#define DRM_I915_GEM_CONTEXT_CREATE     0x2d
+#define DRM_I915_GEM_CONTEXT_DESTROY    0x2e
 
 #define DRM_IOCTL_I915_INIT             DRM_IOW( DRM_COMMAND_BASE + DRM_I915_INIT, drm_i915_init_t)
 #define DRM_IOCTL_I915_FLUSH            DRM_IO ( DRM_COMMAND_BASE + DRM_I915_FLUSH)
@@ -245,6 +247,8 @@ typedef struct _drm_i915_sarea {
 #define DRM_IOCTL_I915_SET_SPRITE_COLORKEY DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_SET_SPRITE_COLORKEY, struct drm_intel_sprite_colorkey)
 #define DRM_IOCTL_I915_GET_SPRITE_COLORKEY DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_SET_SPRITE_COLORKEY, struct drm_intel_sprite_colorkey)
 #define DRM_IOCTL_I915_GEM_WAIT         DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_WAIT, struct drm_i915_gem_wait)
+#define DRM_IOCTL_I915_GEM_CONTEXT_CREATE       DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_CONTEXT_CREATE, struct drm_i915_gem_context_create)
+#define DRM_IOCTL_I915_GEM_CONTEXT_DESTROY      DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_CONTEXT_DESTROY, struct drm_i915_gem_context_destroy)
 
 /* Allow drivers to submit batchbuffers directly to hardware, relying
  * on the security mechanisms provided by hardware.
@@ -897,4 +901,15 @@ struct drm_i915_gem_wait {
         __s64 timeout_ns;
 };
 
+struct drm_i915_gem_context_create {
+        /*  output: id of new context*/
+        __u32 ctx_id;
+        __u32 pad;
+};
+
+struct drm_i915_gem_context_destroy {
+        __u32 ctx_id;
+        __u32 pad;
+};
+
 #endif                          /* _I915_DRM_H_ */