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The LITMUS^RT kernel.

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path: root/drivers/usb/serial/siemens_mpi.c

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author	Glenn Elliott <gelliott@cs.unc.edu>	2014-03-18 14:21:19 -0400
committer	Glenn Elliott <gelliott@cs.unc.edu>	2014-03-18 14:21:19 -0400
commit	5927f76175586daa4e7fb88c631b99d21e685298 (patch)
tree	99ba58ea274b8d5519e733c85a78e2749724f1a5 /drivers/usb/serial/siemens_mpi.c
parent	6a6d06e65c50d7da5dd2019dafbe76ac9c7d018d (diff)

Cleanup priority tracking for budget enforcement.wip-gpusync-merge

Diffstat (limited to 'drivers/usb/serial/siemens_mpi.c')

0 files changed, 0 insertions, 0 deletions

n> buf->iterator / PAGE_SIZE; } /** * Return the index of the current byte in the page */ static inline int drm_buffer_index(struct drm_buffer *buf) { return buf->iterator & (PAGE_SIZE - 1); } /** * Return number of bytes that is left to process */ static inline int drm_buffer_unprocessed(struct drm_buffer *buf) { return buf->size - buf->iterator; } /** * Advance the buffer iterator number of bytes that is given. */ static inline void drm_buffer_advance(struct drm_buffer *buf, int bytes) { buf->iterator += bytes; } /** * Allocate the drm buffer object. * * buf: A pointer to a pointer where the object is stored. * size: The number of bytes to allocate. */ extern int drm_buffer_alloc(struct drm_buffer **buf, int size); /** * Copy the user data to the begin of the buffer and reset the processing * iterator. * * user_data: A pointer the data that is copied to the buffer. * size: The Number of bytes to copy. */ extern int drm_buffer_copy_from_user(struct drm_buffer *buf, void __user *user_data, int size); /** * Free the drm buffer object */ extern void drm_buffer_free(struct drm_buffer *buf); /** * Read an object from buffer that may be split to multiple parts. If object * is not split function just returns the pointer to object in buffer. But in * case of split object data is copied to given stack object that is suplied * by caller. * * The processing location of the buffer is also advanced to the next byte * after the object. * * objsize: The size of the objet in bytes. * stack_obj: A pointer to a memory location where object can be copied. */ extern void *drm_buffer_read_object(struct drm_buffer *buf, int objsize, void *stack_obj); /** * Returns the pointer to the dword which is offset number of elements from the * current processing location. * * Caller must make sure that dword is not split in the buffer. This * requirement is easily met if all the sizes of objects in buffer are * multiples of dword and PAGE_SIZE is multiple dword. * * Call to this function doesn't change the processing location. * * offset: The index of the dword relative to the internat iterator. */ static inline void *drm_buffer_pointer_to_dword(struct drm_buffer *buffer, int offset) { int iter = buffer->iterator + offset * 4; return &buffer->data[iter / PAGE_SIZE][iter & (PAGE_SIZE - 1)]; } /** * Returns the pointer to the dword which is offset number of elements from * the current processing location. * * Call to this function doesn't change the processing location. * * offset: The index of the byte relative to the internat iterator. */ static inline void *drm_buffer_pointer_to_byte(struct drm_buffer *buffer, int offset) { int iter = buffer->iterator + offset; return &buffer->data[iter / PAGE_SIZE][iter & (PAGE_SIZE - 1)]; } #endif


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