hw/qib/qib_file_ops.c

9  * COPYING in the main directory of this source tree, or the
12  *     Redistribution and use in source and binary forms, with or
20  *      - Redistributions in binary form must reproduce the above
22  *        disclaimer in the documentation and/or other materials
170 	 * These have to be set to user addresses in the user code via mmap.
174 	 * page_address() macro worked, but in 2.6.11, even that returns the
216 		/* only spi_subctxt_* fields should be set in this block! */
268  * one that's not in use.
271  * in the long run, we'll allocate as many as we can, and the
273  * That means that when we fail, we have to mark the tids as not in
274  * use again, in our shadow copy.
326 		/* make sure it all fits in tid_pg_list */
344 	/* virtual address of first page in transfer */
381 			i--;    /* last tidlist[i] not filled in */
402 		 * don't check this tid in qib_ctxtshadow, since we
403 		 * just filled it in; start with the next one.
412 		/* same code that's in qib_free_tid() */
415 			/* just in case size changes in future */
440 		 * Copy the updated array, with qib_tid's filled in, back
441 		 * to user.  Since we did the copy in already, this "should
476  * performance.  We check that the TID is in range for this context
479  * be corrupted.  We do check that the TID was in use, for sanity
481  * they pass in to us.
520 		/* just in case size changes in future */
529 		 * in the middle.
588 	 * set in the register or the packet, and it seems
589 	 * cleaner to set in the register than to force all
648  * start_stop == 0 disables receive on the context, for use in queue
663 		 * On enable, force in-memory copy of the tail register to
665 		 * whether or not the chip has yet updated the in-memory
760 	 * in the chip.
790 	 * When we map the PIO buffers in the chip, we want to map them as
792 	 * for this in hardware, but we still prevent users from asking
971  * buffers in the chip.  We have the open and close entries so we can bump
1001 	 * Check for 0 in case one of the allocations failed, but user
1010 	 * Physical addresses must fit in 40 bits for our hardware.
1045 		/* in-memory copy of pioavail registers */
1060 		/* in-memory copy of rcvhdrq tail register */
1302 	 * Allocate memory for use in qib_tid_update() at open to
1424 		/* find device (with ACTIVE ports) with fewest ctxts in use */
1518 static int qib_open(struct inode *in, struct file *fp)
1520 	/* The real work is performed later in qib_assign_ctxt() */
1701 	 * have the in-memory copy out of date at startup for this range of
1735 	 * explicitly set the in-memory tail copy to 0 beforehand, so we
1761  * in use
1789 static int qib_close(struct inode *in, struct file *fp)
1809 	/* ensure all pio buffer writes in progress are flushed */
1949 		 * in trying to get the chip back to ACTIVE, and
1971  * Find all user contexts in use, and set the specified bit in their
2013  * set, if desired, and checks again in future.
2380  * Create per-unit files in /dev
2394  * Remove per-unit files in /dev