drm: Split drm_map and drm_local_map

Once upon a time, the DRM made the distinction between the drm_map
data structure exchanged with user space and the drm_local_map used
in the kernel.

For some reasons, while the BSD port still has that "feature", the
linux part abused drm_map for kernel internal usage as the local
map only existed as a typedef of the struct drm_map.

This patch fixes it by declaring struct drm_local_map separately
(though its content is currently identical to the userspace variant),
and changing the kernel code to only use that, except when it's a
user<->kernel interface (ie. ioctl).

This allows subsequent changes to the in-kernel format

I've also replaced the use of drm_local_map_t with struct drm_local_map
in a couple of places. Mostly by accident but they are the same (the
former is a typedef of the later) and I have some remote plans and
half finished patch to completely kill the drm_local_map_t typedef
so I left those bits in.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>

11 files changed, 75 insertions, 56 deletions

diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c
index fab899eec051..1b8dbd5961bc 100644
--- a/drivers/gpu/drm/drm_bufs.c
+++ b/drivers/gpu/drm/drm_bufs.c
@@ -50,7 +50,7 @@ resource_size_t drm_get_resource_len(struct drm_device *dev, unsigned int resour
 EXPORT_SYMBOL(drm_get_resource_len);
 
 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
-                                             drm_local_map_t *map)
+                                                  struct drm_local_map *map)
 {
         struct drm_map_list *entry;
         list_for_each_entry(entry, &dev->maplist, head) {
@@ -89,13 +89,8 @@ static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
 }
 
 /**
- * Ioctl to specify a range of memory that is available for mapping by a non-root process.
- *
- * \param inode device inode.
- * \param file_priv DRM file private.
- * \param cmd command.
- * \param arg pointer to a drm_map structure.
- * \return zero on success or a negative value on error.
+ * Core function to create a range of memory available for mapping by a
+ * non-root process.
  *
  * Adjusts the memory offset to its absolute value according to the mapping
  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
@@ -106,7 +101,7 @@ static int drm_addmap_core(struct drm_device * dev, unsigned int offset,
                            enum drm_map_flags flags,
                            struct drm_map_list ** maplist)
 {
-        struct drm_map *map;
+        struct drm_local_map *map;
         struct drm_map_list *list;
         drm_dma_handle_t *dmah;
         unsigned long user_token;
@@ -329,7 +324,7 @@ static int drm_addmap_core(struct drm_device * dev, unsigned int offset,
 
 int drm_addmap(struct drm_device * dev, unsigned int offset,
                unsigned int size, enum drm_map_type type,
-               enum drm_map_flags flags, drm_local_map_t ** map_ptr)
+               enum drm_map_flags flags, struct drm_local_map ** map_ptr)
 {
         struct drm_map_list *list;
         int rc;
@@ -342,6 +337,17 @@ int drm_addmap(struct drm_device * dev, unsigned int offset,
 
 EXPORT_SYMBOL(drm_addmap);
 
+/**
+ * Ioctl to specify a range of memory that is available for mapping by a
+ * non-root process.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg pointer to a drm_map structure.
+ * \return zero on success or a negative value on error.
+ *
+ */
 int drm_addmap_ioctl(struct drm_device *dev, void *data,
                      struct drm_file *file_priv)
 {
@@ -367,19 +373,13 @@ int drm_addmap_ioctl(struct drm_device *dev, void *data,
  * Remove a map private from list and deallocate resources if the mapping
  * isn't in use.
  *
- * \param inode device inode.
- * \param file_priv DRM file private.
- * \param cmd command.
- * \param arg pointer to a struct drm_map structure.
- * \return zero on success or a negative value on error.
- *
  * Searches the map on drm_device::maplist, removes it from the list, see if
  * its being used, and free any associate resource (such as MTRR's) if it's not
  * being on use.
  *
  * \sa drm_addmap
  */
-int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *map)
+int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 {
         struct drm_map_list *r_list = NULL, *list_t;
         drm_dma_handle_t dmah;
@@ -442,7 +442,7 @@ int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *map)
 }
 EXPORT_SYMBOL(drm_rmmap_locked);
 
-int drm_rmmap(struct drm_device *dev, drm_local_map_t *map)
+int drm_rmmap(struct drm_device *dev, struct drm_local_map *map)
 {
         int ret;
 
@@ -462,12 +462,18 @@ EXPORT_SYMBOL(drm_rmmap);
  * One use case might be after addmap is allowed for normal users for SHM and
  * gets used by drivers that the server doesn't need to care about.  This seems
  * unlikely.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg pointer to a struct drm_map structure.
+ * \return zero on success or a negative value on error.
  */
 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
                     struct drm_file *file_priv)
 {
         struct drm_map *request = data;
-        drm_local_map_t *map = NULL;
+        struct drm_local_map *map = NULL;
         struct drm_map_list *r_list;
         int ret;
 
@@ -1534,7 +1540,7 @@ int drm_mapbufs(struct drm_device *dev, void *data,
                         && (dma->flags & _DRM_DMA_USE_SG))
                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
                         && (dma->flags & _DRM_DMA_USE_FB))) {
-                        struct drm_map *map = dev->agp_buffer_map;
+                        struct drm_local_map *map = dev->agp_buffer_map;
                         unsigned long token = dev->agp_buffer_token;
 
                         if (!map) {
diff --git a/drivers/gpu/drm/drm_context.c b/drivers/gpu/drm/drm_context.c
index 809ec0f03452..7d1e53c10d4b 100644
--- a/drivers/gpu/drm/drm_context.c
+++ b/drivers/gpu/drm/drm_context.c
@@ -143,7 +143,7 @@ int drm_getsareactx(struct drm_device *dev, void *data,
                     struct drm_file *file_priv)
 {
         struct drm_ctx_priv_map *request = data;
-        struct drm_map *map;
+        struct drm_local_map *map;
         struct drm_map_list *_entry;
 
         mutex_lock(&dev->struct_mutex);
@@ -186,7 +186,7 @@ int drm_setsareactx(struct drm_device *dev, void *data,
                     struct drm_file *file_priv)
 {
         struct drm_ctx_priv_map *request = data;
-        struct drm_map *map = NULL;
+        struct drm_local_map *map = NULL;
         struct drm_map_list *r_list = NULL;
 
         mutex_lock(&dev->struct_mutex);
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 14c7a23dc157..6394c2b67658 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -530,7 +530,7 @@ int drm_ioctl(struct inode *inode, struct file *filp,
 
 EXPORT_SYMBOL(drm_ioctl);
 
-drm_local_map_t *drm_getsarea(struct drm_device *dev)
+struct drm_local_map *drm_getsarea(struct drm_device *dev)
 {
         struct drm_map_list *entry;
 
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 88d3368ffddd..c1173d8c4588 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -502,7 +502,7 @@ int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
         struct drm_file *priv = filp->private_data;
         struct drm_device *dev = priv->minor->dev;
         struct drm_gem_mm *mm = dev->mm_private;
-        struct drm_map *map = NULL;
+        struct drm_local_map *map = NULL;
         struct drm_gem_object *obj;
         struct drm_hash_item *hash;
         unsigned long prot;
diff --git a/drivers/gpu/drm/drm_memory.c b/drivers/gpu/drm/drm_memory.c
index bcc869bc4092..0c707f533eab 100644
--- a/drivers/gpu/drm/drm_memory.c
+++ b/drivers/gpu/drm/drm_memory.c
@@ -159,7 +159,7 @@ static inline void *agp_remap(unsigned long offset, unsigned long size,
 
 #endif                          /* debug_memory */
 
-void drm_core_ioremap(struct drm_map *map, struct drm_device *dev)
+void drm_core_ioremap(struct drm_local_map *map, struct drm_device *dev)
 {
         if (drm_core_has_AGP(dev) &&
             dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
@@ -169,7 +169,7 @@ void drm_core_ioremap(struct drm_map *map, struct drm_device *dev)
 }
 EXPORT_SYMBOL(drm_core_ioremap);
 
-void drm_core_ioremap_wc(struct drm_map *map, struct drm_device *dev)
+void drm_core_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
 {
         if (drm_core_has_AGP(dev) &&
             dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
@@ -179,7 +179,7 @@ void drm_core_ioremap_wc(struct drm_map *map, struct drm_device *dev)
 }
 EXPORT_SYMBOL(drm_core_ioremap_wc);
 
-void drm_core_ioremapfree(struct drm_map *map, struct drm_device *dev)
+void drm_core_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
 {
         if (!map->handle || !map->size)
                 return;
diff --git a/drivers/gpu/drm/drm_proc.c b/drivers/gpu/drm/drm_proc.c
index 8df849f66830..c1959badf11f 100644
--- a/drivers/gpu/drm/drm_proc.c
+++ b/drivers/gpu/drm/drm_proc.c
@@ -247,7 +247,7 @@ static int drm__vm_info(char *buf, char **start, off_t offset, int request,
         struct drm_minor *minor = (struct drm_minor *) data;
         struct drm_device *dev = minor->dev;
         int len = 0;
-        struct drm_map *map;
+        struct drm_local_map *map;
         struct drm_map_list *r_list;
 
         /* Hardcoded from _DRM_FRAME_BUFFER,
diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c
index 3ffae021d280..0d8bbd72ec55 100644
--- a/drivers/gpu/drm/drm_vm.c
+++ b/drivers/gpu/drm/drm_vm.c
@@ -91,7 +91,7 @@ static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
         struct drm_file *priv = vma->vm_file->private_data;
         struct drm_device *dev = priv->minor->dev;
-        struct drm_map *map = NULL;
+        struct drm_local_map *map = NULL;
         struct drm_map_list *r_list;
         struct drm_hash_item *hash;
 
@@ -176,7 +176,7 @@ static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
  */
 static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
-        struct drm_map *map = (struct drm_map *) vma->vm_private_data;
+        struct drm_local_map *map = vma->vm_private_data;
         unsigned long offset;
         unsigned long i;
         struct page *page;
@@ -209,7 +209,7 @@ static void drm_vm_shm_close(struct vm_area_struct *vma)
         struct drm_file *priv = vma->vm_file->private_data;
         struct drm_device *dev = priv->minor->dev;
         struct drm_vma_entry *pt, *temp;
-        struct drm_map *map;
+        struct drm_local_map *map;
         struct drm_map_list *r_list;
         int found_maps = 0;
 
@@ -322,7 +322,7 @@ static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
  */
 static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
-        struct drm_map *map = (struct drm_map *) vma->vm_private_data;
+        struct drm_local_map *map = vma->vm_private_data;
         struct drm_file *priv = vma->vm_file->private_data;
         struct drm_device *dev = priv->minor->dev;
         struct drm_sg_mem *entry = dev->sg;
@@ -512,7 +512,7 @@ static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
         return 0;
 }
 
-unsigned long drm_core_get_map_ofs(struct drm_map * map)
+unsigned long drm_core_get_map_ofs(struct drm_local_map * map)
 {
         return map->offset;
 }
@@ -547,7 +547,7 @@ int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
 {
         struct drm_file *priv = filp->private_data;
         struct drm_device *dev = priv->minor->dev;
-        struct drm_map *map = NULL;
+        struct drm_local_map *map = NULL;
         unsigned long offset = 0;
         struct drm_hash_item *hash;
 
diff --git a/drivers/gpu/drm/i810/i810_drv.h b/drivers/gpu/drm/i810/i810_drv.h
index 0118849a5672..21e2691f28f9 100644
--- a/drivers/gpu/drm/i810/i810_drv.h
+++ b/drivers/gpu/drm/i810/i810_drv.h
@@ -77,8 +77,8 @@ typedef struct _drm_i810_ring_buffer {
 } drm_i810_ring_buffer_t;
 
 typedef struct drm_i810_private {
-        struct drm_map *sarea_map;
-        struct drm_map *mmio_map;
+        struct drm_local_map *sarea_map;
+        struct drm_local_map *mmio_map;
 
         drm_i810_sarea_t *sarea_priv;
         drm_i810_ring_buffer_t ring;
diff --git a/drivers/gpu/drm/i830/i830_drv.h b/drivers/gpu/drm/i830/i830_drv.h
index b5bf8cc0fdaa..da82afe4ded5 100644
--- a/drivers/gpu/drm/i830/i830_drv.h
+++ b/drivers/gpu/drm/i830/i830_drv.h
@@ -84,8 +84,8 @@ typedef struct _drm_i830_ring_buffer {
 } drm_i830_ring_buffer_t;
 
 typedef struct drm_i830_private {
-        struct drm_map *sarea_map;
-        struct drm_map *mmio_map;
+        struct drm_local_map *sarea_map;
+        struct drm_local_map *mmio_map;
 
         drm_i830_sarea_t *sarea_priv;
         drm_i830_ring_buffer_t ring;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 37427e4016cb..592b24efeb48 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -627,7 +627,7 @@ i915_gem_create_mmap_offset(struct drm_gem_object *obj)
         struct drm_gem_mm *mm = dev->mm_private;
         struct drm_i915_gem_object *obj_priv = obj->driver_private;
         struct drm_map_list *list;
-        struct drm_map *map;
+        struct drm_local_map *map;
         int ret = 0;
 
         /* Set the object up for mmap'ing */
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 34e1676b53d1..03a7c11cb24d 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -523,19 +523,32 @@ struct drm_mm {
 
 
 /**
+ * Kernel side of a mapping
+ */
+struct drm_local_map {
+        unsigned long offset;    /**< Requested physical address (0 for SAREA)*/
+        unsigned long size;      /**< Requested physical size (bytes) */
+        enum drm_map_type type;  /**< Type of memory to map */
+        enum drm_map_flags flags;        /**< Flags */
+        void *handle;            /**< User-space: "Handle" to pass to mmap() */
+                                 /**< Kernel-space: kernel-virtual address */
+        int mtrr;                /**< MTRR slot used */
+};
+
+typedef struct drm_local_map drm_local_map_t;
+
+/**
  * Mappings list
  */
 struct drm_map_list {
         struct list_head head;          /**< list head */
         struct drm_hash_item hash;
-        struct drm_map *map;                    /**< mapping */
+        struct drm_local_map *map;      /**< mapping */
         uint64_t user_token;
         struct drm_master *master;
         struct drm_mm_node *file_offset_node;   /**< fake offset */
 };
 
-typedef struct drm_map drm_local_map_t;
-
 /**
  * Context handle list
  */
@@ -560,7 +573,7 @@ struct drm_ati_pcigart_info {
         dma_addr_t bus_addr;
         dma_addr_t table_mask;
         struct drm_dma_handle *table_handle;
-        drm_local_map_t mapping;
+        struct drm_local_map mapping;
         int table_size;
 };
 
@@ -747,7 +760,7 @@ struct drm_driver {
                                         struct drm_file *file_priv);
         void (*reclaim_buffers_idlelocked) (struct drm_device *dev,
                                             struct drm_file *file_priv);
-        unsigned long (*get_map_ofs) (struct drm_map * map);
+        unsigned long (*get_map_ofs) (struct drm_local_map * map);
         unsigned long (*get_reg_ofs) (struct drm_device *dev);
         void (*set_version) (struct drm_device *dev,
                              struct drm_set_version *sv);
@@ -932,7 +945,7 @@ struct drm_device {
         sigset_t sigmask;
 
         struct drm_driver *driver;
-        drm_local_map_t *agp_buffer_map;
+        struct drm_local_map *agp_buffer_map;
         unsigned int agp_buffer_token;
         struct drm_minor *control;              /**< Control node for card */
         struct drm_minor *primary;              /**< render type primary screen head */
@@ -1049,7 +1062,7 @@ extern int drm_release(struct inode *inode, struct file *filp);
 extern int drm_mmap(struct file *filp, struct vm_area_struct *vma);
 extern int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma);
 extern void drm_vm_open_locked(struct vm_area_struct *vma);
-extern unsigned long drm_core_get_map_ofs(struct drm_map * map);
+extern unsigned long drm_core_get_map_ofs(struct drm_local_map * map);
 extern unsigned long drm_core_get_reg_ofs(struct drm_device *dev);
 extern unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait);
 
@@ -1155,11 +1168,11 @@ extern int drm_addbufs_agp(struct drm_device *dev, struct drm_buf_desc * request
 extern int drm_addbufs_pci(struct drm_device *dev, struct drm_buf_desc * request);
 extern int drm_addmap(struct drm_device *dev, unsigned int offset,
                       unsigned int size, enum drm_map_type type,
-                      enum drm_map_flags flags, drm_local_map_t ** map_ptr);
+                      enum drm_map_flags flags, struct drm_local_map **map_ptr);
 extern int drm_addmap_ioctl(struct drm_device *dev, void *data,
                             struct drm_file *file_priv);
-extern int drm_rmmap(struct drm_device *dev, drm_local_map_t *map);
-extern int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *map);
+extern int drm_rmmap(struct drm_device *dev, struct drm_local_map *map);
+extern int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map);
 extern int drm_rmmap_ioctl(struct drm_device *dev, void *data,
                            struct drm_file *file_priv);
 extern int drm_addbufs(struct drm_device *dev, void *data,
@@ -1261,7 +1274,7 @@ extern struct proc_dir_entry *drm_proc_root;
 
 extern struct idr drm_minors_idr;
 
-extern drm_local_map_t *drm_getsarea(struct drm_device *dev);
+extern struct drm_local_map *drm_getsarea(struct drm_device *dev);
 
                                 /* Proc support (drm_proc.h) */
 extern int drm_proc_init(struct drm_minor *minor, int minor_id,
@@ -1378,12 +1391,12 @@ int drm_gem_open_ioctl(struct drm_device *dev, void *data,
 void drm_gem_open(struct drm_device *dev, struct drm_file *file_private);
 void drm_gem_release(struct drm_device *dev, struct drm_file *file_private);
 
-extern void drm_core_ioremap(struct drm_map *map, struct drm_device *dev);
-extern void drm_core_ioremap_wc(struct drm_map *map, struct drm_device *dev);
-extern void drm_core_ioremapfree(struct drm_map *map, struct drm_device *dev);
+extern void drm_core_ioremap(struct drm_local_map *map, struct drm_device *dev);
+extern void drm_core_ioremap_wc(struct drm_local_map *map, struct drm_device *dev);
+extern void drm_core_ioremapfree(struct drm_local_map *map, struct drm_device *dev);
 
-static __inline__ struct drm_map *drm_core_findmap(struct drm_device *dev,
-                                                   unsigned int token)
+static __inline__ struct drm_local_map *drm_core_findmap(struct drm_device *dev,
+                                                         unsigned int token)
 {
         struct drm_map_list *_entry;
         list_for_each_entry(_entry, &dev->maplist, head)
@@ -1410,7 +1423,7 @@ static __inline__ int drm_device_is_pcie(struct drm_device *dev)
         return pci_find_capability(dev->pdev, PCI_CAP_ID_EXP);
 }
 
-static __inline__ void drm_core_dropmap(struct drm_map *map)
+static __inline__ void drm_core_dropmap(struct drm_local_map *map)
 {
 }