drm: document drm_auth.c
Also extract drm_auth.h for nicer grouping. v2: Nuke the other comments since they don't really explain a lot, and within the drm core we generally only document functions exported to drivers: The main audience for these docs are driver writers. v3: Limit the exposure of drm_master internals by only including drm_auth.h where it is neede (Chris). v4: Spelling polish (Emil). Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
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Daniel Vetter
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@ -20,6 +20,19 @@ libdrm Device Lookup
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.. kernel-doc:: drivers/gpu/drm/drm_ioctl.c
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:doc: getunique and setversion story
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Primary Nodes, DRM Master and Authentication
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============================================
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.. kernel-doc:: drivers/gpu/drm/drm_auth.c
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:doc: master and authentication
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.. kernel-doc:: drivers/gpu/drm/drm_auth.c
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:export:
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.. kernel-doc:: include/drm/drm_auth.h
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:internal:
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Render nodes
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============
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@ -33,17 +33,27 @@
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#include "drm_legacy.h"
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/**
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* drm_getmagic - Get unique magic of a client
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* @dev: DRM device to operate on
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* @data: ioctl data containing the drm_auth object
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* @file_priv: DRM file that performs the operation
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* DOC: master and authentication
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*
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* This looks up the unique magic of the passed client and returns it. If the
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* client did not have a magic assigned, yet, a new one is registered. The magic
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* is stored in the passed drm_auth object.
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* struct &drm_master is used to track groups of clients with open
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* primary/legacy device nodes. For every struct &drm_file which has had at
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* least once successfully became the device master (either through the
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* SET_MASTER IOCTL, or implicitly through opening the primary device node when
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* no one else is the current master that time) there exists one &drm_master.
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* This is noted in the is_master member of &drm_file. All other clients have
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* just a pointer to the &drm_master they are associated with.
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*
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* Returns: 0 on success, negative error code on failure.
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* In addition only one &drm_master can be the current master for a &drm_device.
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* It can be switched through the DROP_MASTER and SET_MASTER IOCTL, or
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* implicitly through closing/openeing the primary device node. See also
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* drm_is_current_master().
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*
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* Clients can authenticate against the current master (if it matches their own)
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* using the GETMAGIC and AUTHMAGIC IOCTLs. Together with exchanging masters,
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* this allows controlled access to the device for an entire group of mutually
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* trusted clients.
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*/
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int drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv)
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{
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struct drm_auth *auth = data;
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@ -64,16 +74,6 @@ int drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv)
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return ret < 0 ? ret : 0;
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}
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/**
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* drm_authmagic - Authenticate client with a magic
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* @dev: DRM device to operate on
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* @data: ioctl data containing the drm_auth object
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* @file_priv: DRM file that performs the operation
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*
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* This looks up a DRM client by the passed magic and authenticates it.
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*
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* Returns: 0 on success, negative error code on failure.
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*/
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int drm_authmagic(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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@ -126,16 +126,6 @@ static int drm_set_master(struct drm_device *dev, struct drm_file *fpriv,
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return ret;
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}
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/*
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* drm_new_set_master - Allocate a new master object and become master for the
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* associated master realm.
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*
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* @dev: The associated device.
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* @fpriv: File private identifying the client.
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*
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* This function must be called with dev::master_mutex held.
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* Returns negative error code on failure. Zero on success.
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*/
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static int drm_new_set_master(struct drm_device *dev, struct drm_file *fpriv)
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{
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struct drm_master *old_master;
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@ -286,12 +276,28 @@ out:
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mutex_unlock(&dev->master_mutex);
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}
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/**
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* drm_is_current_master - checks whether @priv is the current master
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* @fpriv: DRM file private
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*
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* Checks whether @fpriv is current master on its device. This decides whether a
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* client is allowed to run DRM_MASTER IOCTLs.
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*
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* Most of the modern IOCTL which require DRM_MASTER are for kernel modesetting
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* - the current master is assumed to own the non-shareable display hardware.
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*/
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bool drm_is_current_master(struct drm_file *fpriv)
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{
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return fpriv->is_master && fpriv->master == fpriv->minor->dev->master;
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}
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EXPORT_SYMBOL(drm_is_current_master);
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/**
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* drm_master_get - reference a master pointer
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* @master: struct &drm_master
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*
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* Increments the reference count of @master and returns a pointer to @master.
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*/
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struct drm_master *drm_master_get(struct drm_master *master)
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{
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kref_get(&master->refcount);
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@ -314,6 +320,12 @@ static void drm_master_destroy(struct kref *kref)
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kfree(master);
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}
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/**
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* drm_master_put - unreference and clear a master pointer
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* @master: pointer to a pointer of struct &drm_master
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*
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* This decrements the &drm_master behind @master and sets it to NULL.
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*/
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void drm_master_put(struct drm_master **master)
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{
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kref_put(&(*master)->refcount, drm_master_destroy);
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@ -39,6 +39,7 @@
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#include <drm/drm_fourcc.h>
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#include <drm/drm_modeset_lock.h>
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#include <drm/drm_atomic.h>
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#include <drm/drm_auth.h>
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#include "drm_crtc_internal.h"
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#include "drm_internal.h"
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@ -30,6 +30,7 @@
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#include <drm/drmP.h>
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#include <drm/drm_core.h>
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#include <drm/drm_auth.h>
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#include "drm_legacy.h"
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#include "drm_internal.h"
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#include "drm_crtc_internal.h"
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@ -47,6 +47,7 @@
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#include <drm/intel-gtt.h>
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#include <drm/drm_legacy.h> /* for struct drm_dma_handle */
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#include <drm/drm_gem.h>
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#include <drm/drm_auth.h>
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#include "i915_params.h"
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#include "i915_reg.h"
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@ -32,6 +32,7 @@
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#include <drm/drmP.h>
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#include <drm/vmwgfx_drm.h>
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#include <drm/drm_hashtab.h>
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#include <drm/drm_auth.h>
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#include <linux/suspend.h>
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#include <drm/ttm/ttm_bo_driver.h>
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#include <drm/ttm/ttm_object.h>
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@ -86,6 +86,7 @@ struct drm_local_map;
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struct drm_device_dma;
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struct drm_dma_handle;
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struct drm_gem_object;
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struct drm_master;
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struct device_node;
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struct videomode;
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@ -373,30 +374,6 @@ struct drm_lock_data {
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int idle_has_lock;
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};
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/**
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* struct drm_master - drm master structure
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*
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* @refcount: Refcount for this master object.
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* @dev: Link back to the DRM device
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* @unique: Unique identifier: e.g. busid. Protected by drm_global_mutex.
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* @unique_len: Length of unique field. Protected by drm_global_mutex.
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* @magic_map: Map of used authentication tokens. Protected by struct_mutex.
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* @lock: DRI lock information.
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* @driver_priv: Pointer to driver-private information.
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*
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* Note that master structures are only relevant for the legacy/primary device
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* nodes, hence there can only be one per device, not one per drm_minor.
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*/
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struct drm_master {
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struct kref refcount;
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struct drm_device *dev;
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char *unique;
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int unique_len;
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struct idr magic_map;
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struct drm_lock_data lock;
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void *driver_priv;
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};
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/* Flags and return codes for get_vblank_timestamp() driver function. */
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#define DRM_CALLED_FROM_VBLIRQ 1
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#define DRM_VBLANKTIME_SCANOUTPOS_METHOD (1 << 0)
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@ -1012,11 +989,6 @@ static inline wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc
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extern void drm_vblank_pre_modeset(struct drm_device *dev, unsigned int pipe);
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extern void drm_vblank_post_modeset(struct drm_device *dev, unsigned int pipe);
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/* drm_auth.c */
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struct drm_master *drm_master_get(struct drm_master *master);
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void drm_master_put(struct drm_master **master);
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bool drm_is_current_master(struct drm_file *fpriv);
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/* drm_drv.c */
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void drm_put_dev(struct drm_device *dev);
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void drm_unplug_dev(struct drm_device *dev);
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@ -0,0 +1,59 @@
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/*
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* Internal Header for the Direct Rendering Manager
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*
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* Copyright 2016 Intel Corporation
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*
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* Author: Daniel Vetter <daniel.vetter@ffwll.ch>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _DRM_AUTH_H_
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#define _DRM_AUTH_H_
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/**
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* struct drm_master - drm master structure
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*
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* @refcount: Refcount for this master object.
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* @dev: Link back to the DRM device
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* @unique: Unique identifier: e.g. busid. Protected by drm_global_mutex.
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* @unique_len: Length of unique field. Protected by drm_global_mutex.
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* @magic_map: Map of used authentication tokens. Protected by struct_mutex.
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* @lock: DRI lock information.
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* @driver_priv: Pointer to driver-private information.
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*
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* Note that master structures are only relevant for the legacy/primary device
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* nodes, hence there can only be one per device, not one per drm_minor.
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*/
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struct drm_master {
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struct kref refcount;
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struct drm_device *dev;
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char *unique;
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int unique_len;
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struct idr magic_map;
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struct drm_lock_data lock;
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void *driver_priv;
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};
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struct drm_master *drm_master_get(struct drm_master *master);
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void drm_master_put(struct drm_master **master);
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bool drm_is_current_master(struct drm_file *fpriv);
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#endif
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@ -1,6 +1,8 @@
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#ifndef __DRM_DRM_LEGACY_H__
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#define __DRM_DRM_LEGACY_H__
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#include <drm/drm_auth.h>
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/*
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* Legacy driver interfaces for the Direct Rendering Manager
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*
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