34 	/* Guest physical address of the current chain. */
36 	/* Count of the valid ccws in chain. */
333  * @head: address of the beginning of a CCW chain
334  * @len: number of CCWs within the chain
336  * Determine whether the address of a CCW (whether a new chain,
358 	struct ccwchain *chain;  in ccwchain_alloc()  local
363 	size = ((sizeof(*chain) + 7L) & -8L) +  in ccwchain_alloc()
364 		sizeof(*chain->ch_ccw) * len +  in ccwchain_alloc()
365 		sizeof(*chain->ch_pa) * len;  in ccwchain_alloc()
366 	chain = kzalloc(size, GFP_DMA | GFP_KERNEL);  in ccwchain_alloc()
367 	if (!chain)  in ccwchain_alloc()
370 	data = (u8 *)chain + ((sizeof(*chain) + 7L) & -8L);  in ccwchain_alloc()
371 	chain->ch_ccw = (struct ccw1 *)data;  in ccwchain_alloc()
373 	data = (u8 *)(chain->ch_ccw) + sizeof(*chain->ch_ccw) * len;  in ccwchain_alloc()
374 	chain->ch_pa = (struct page_array *)data;  in ccwchain_alloc()
376 	chain->ch_len = len;  in ccwchain_alloc()
378 	list_add_tail(&chain->next, &cp->ccwchain_list);  in ccwchain_alloc()
380 	return chain;  in ccwchain_alloc()
383 static void ccwchain_free(struct ccwchain *chain)  in ccwchain_free()  argument
385 	list_del(&chain->next);  in ccwchain_free()
386 	kfree(chain);  in ccwchain_free()
390 static void ccwchain_cda_free(struct ccwchain *chain, int idx)  in ccwchain_cda_free()  argument
392 	struct ccw1 *ccw = chain->ch_ccw + idx;  in ccwchain_cda_free()
401  * ccwchain_calc_length - calculate the length of the ccw chain.
402  * @iova: guest physical address of the target ccw chain
405  * This is the chain length not considering any TICs.
411  * Returns: the length of the ccw chain or -errno.
432 		 * that loops back into the current chain.  The latter  in ccwchain_calc_length()
451 	struct ccwchain *chain;  in tic_target_chain_exists()  local
454 	list_for_each_entry(chain, &cp->ccwchain_list, next) {  in tic_target_chain_exists()
455 		ccw_head = chain->ch_iova;  in tic_target_chain_exists()
456 		if (is_cpa_within_range(tic->cda, ccw_head, chain->ch_len))  in tic_target_chain_exists()
463 static int ccwchain_loop_tic(struct ccwchain *chain,
470 	struct ccwchain *chain;  in ccwchain_handle_ccw()  local
483 	/* Count the CCWs in the current chain */  in ccwchain_handle_ccw()
488 	/* Need alloc a new chain for this one. */  in ccwchain_handle_ccw()
489 	chain = ccwchain_alloc(cp, len);  in ccwchain_handle_ccw()
490 	if (!chain)  in ccwchain_handle_ccw()
492 	chain->ch_iova = cda;  in ccwchain_handle_ccw()
494 	/* Copy the actual CCWs into the new chain */  in ccwchain_handle_ccw()
495 	memcpy(chain->ch_ccw, cp->guest_cp, len * sizeof(struct ccw1));  in ccwchain_handle_ccw()
497 	/* Loop for tics on this new chain. */  in ccwchain_handle_ccw()
498 	ret = ccwchain_loop_tic(chain, cp);  in ccwchain_handle_ccw()
501 		ccwchain_free(chain);  in ccwchain_handle_ccw()
507 static int ccwchain_loop_tic(struct ccwchain *chain, struct channel_program *cp)  in ccwchain_loop_tic()  argument
512 	for (i = 0; i < chain->ch_len; i++) {  in ccwchain_loop_tic()
513 		tic = chain->ch_ccw + i;  in ccwchain_loop_tic()
518 		/* May transfer to an existing chain. */  in ccwchain_loop_tic()
531 static int ccwchain_fetch_tic(struct ccwchain *chain,  in ccwchain_fetch_tic()  argument
535 	struct ccw1 *ccw = chain->ch_ccw + idx;  in ccwchain_fetch_tic()
551 static int ccwchain_fetch_direct(struct ccwchain *chain,  in ccwchain_fetch_direct()  argument
566 	ccw = chain->ch_ccw + idx;  in ccwchain_fetch_direct()
597 	pa = chain->ch_pa + idx;  in ccwchain_fetch_direct()
653 static int ccwchain_fetch_one(struct ccwchain *chain,  in ccwchain_fetch_one()  argument
657 	struct ccw1 *ccw = chain->ch_ccw + idx;  in ccwchain_fetch_one()
660 		return ccwchain_fetch_tic(chain, idx, cp);  in ccwchain_fetch_one()
662 	return ccwchain_fetch_direct(chain, idx, cp);  in ccwchain_fetch_one()
736 	struct ccwchain *chain, *temp;  in cp_free()  local
743 	list_for_each_entry_safe(chain, temp, &cp->ccwchain_list, next) {  in cp_free()
744 		for (i = 0; i < chain->ch_len; i++) {  in cp_free()
745 			page_array_unpin_free(chain->ch_pa + i, vdev);  in cp_free()
746 			ccwchain_cda_free(chain, i);  in cp_free()
748 		ccwchain_free(chain);  in cp_free()
761  * For each chain composing the channel program:
764  * This allows cp_free to find in ch_len the count of CCWs to free in a chain.
767  * as helpers to do ccw chain translation inside the kernel. Basically
791 	struct ccwchain *chain;  in cp_prefetch()  local
798 	list_for_each_entry(chain, &cp->ccwchain_list, next) {  in cp_prefetch()
799 		len = chain->ch_len;  in cp_prefetch()
801 			ret = ccwchain_fetch_one(chain, idx, cp);  in cp_prefetch()
809 	/* Only cleanup the chain elements that were actually translated. */  in cp_prefetch()
810 	chain->ch_len = idx;  in cp_prefetch()
811 	list_for_each_entry_continue(chain, &cp->ccwchain_list, next) {  in cp_prefetch()
812 		chain->ch_len = 0;  in cp_prefetch()
830 	struct ccwchain *chain;  in cp_get_orb()  local
846 	chain = list_first_entry(&cp->ccwchain_list, struct ccwchain, next);  in cp_get_orb()
847 	cpa = chain->ch_ccw;  in cp_get_orb()
869 	struct ccwchain *chain;  in cp_update_scsw()  local
882 	list_for_each_entry(chain, &cp->ccwchain_list, next) {  in cp_update_scsw()
883 		ccw_head = (u32)(u64)chain->ch_ccw;  in cp_update_scsw()
886 		 * of the chain.  in cp_update_scsw()
888 		if (is_cpa_within_range(cpa, ccw_head, chain->ch_len + 1)) {  in cp_update_scsw()
891 			 * physical ccw to its chain head.  in cp_update_scsw()
892 			 * Adding this value to the guest physical ccw chain  in cp_update_scsw()
895 			cpa = chain->ch_iova + (cpa - ccw_head);  in cp_update_scsw()
904  * cp_iova_pinned() - check if an iova is pinned for a ccw chain.
909  * If the @iova is currently pinned for the ccw chain, return true;
914 	struct ccwchain *chain;  in cp_iova_pinned()  local
920 	list_for_each_entry(chain, &cp->ccwchain_list, next) {  in cp_iova_pinned()
921 		for (i = 0; i < chain->ch_len; i++)  in cp_iova_pinned()
922 			if (page_array_iova_pinned(chain->ch_pa + i, iova, length))  in cp_iova_pinned()