linux-4.4.1/ion_buffer の変更点

• 追加された行はこの色です。
• 削除された行はこの色です。
• linux-4.4.1/ion_buffer へ行く。
• linux-4.4.1/ion_buffer の差分を削除

*参照元 [#k14b590d]
#backlinks

*説明 [#tc0032f7]
-パス: [[linux-4.4.1/drivers/staging/android/ion/ion_priv.h]]

-FIXME: これは何？
--ION ヒープから確保した ION バッファ
--ION ヒープ: [[linux-4.4.1/ion_heap]]
--バッファ確保: [[linux-4.4.1/ion_buffer_create()]]
--バッファ解放: [[linux-4.4.1/ion_buffer_destroy()]]
--[[linux-4.4.1/ion_heap]]


**参考 [#cb8f9876]


*実装 [#f17c5f19]
 /**
  * struct ion_buffer - metadata for a particular buffer
  * @ref:                reference count
  * @node:               node in the ion_device buffers tree
  * @dev:                back pointer to the ion_device
  * @heap:               back pointer to the heap the buffer came from
  * @flags:              buffer specific flags
  * @private_flags:      internal buffer specific flags
  * @size:               size of the buffer
  * @priv_virt:          private data to the buffer representable as
  *                      a void *
  * @priv_phys:          private data to the buffer representable as
  *                      an ion_phys_addr_t (and someday a phys_addr_t)
  * @lock:               protects the buffers cnt fields
  * @kmap_cnt:           number of times the buffer is mapped to the kernel
  * @vaddr:              the kernel mapping if kmap_cnt is not zero
  * @dmap_cnt:           number of times the buffer is mapped for dma
  * @sg_table:           the sg table for the buffer if dmap_cnt is not zero
  * @pages:              flat array of pages in the buffer -- used by fault
  *                      handler and only valid for buffers that are faulted in
  * @vmas:               list of vma's mapping this buffer
  * @handle_count:       count of handles referencing this buffer
  * @task_comm:          taskcomm of last client to reference this buffer in a
  *                      handle, used for debugging
  * @pid:                pid of last client to reference this buffer in a
  *                      handle, used for debugging
 */
 struct ion_buffer {
         struct kref ref;
-
--[[linux-4.4.1/kref]]

         union {
                 struct rb_node node;
                 struct list_head list;
         };
-
--[[linux-4.4.1/rb_node]]
--[[linux-4.4.1/list_head]]

         struct ion_device *dev;
         struct ion_heap *heap;
-
--[[linux-4.4.1/ion_device]]
--[[linux-4.4.1/ion_heap]]

         unsigned long flags;
         unsigned long private_flags;
         size_t size;
         union {
                 void *priv_virt;
                 ion_phys_addr_t priv_phys;
         };
-
--[[linux-4.4.1/ion_phys_addr_t]]

         struct mutex lock;
         int kmap_cnt;
         void *vaddr;
         int dmap_cnt;
-
--[[linux-4.4.1/mutex]]

         struct sg_table *sg_table;
         struct page **pages;
         struct list_head vmas;
-
--[[linux-4.4.1/sg_table]]
--[[linux-4.4.1/page]]
--[[linux-4.4.1/list_head]]

         /* used to track orphaned buffers */
         int handle_count;
         char task_comm[TASK_COMM_LEN];
         pid_t pid;
-
--[[linux-4.4.1/pid_t]]

 };


*コメント [#t1b4e2a7]