34 	/* Guest physical address of the current chain. */
36 	/* Count of the valid ccws in chain. */
294  * @head: address of the beginning of a CCW chain
295  * @len: number of CCWs within the chain
297  * Determine whether the address of a CCW (whether a new chain,
320 	struct ccwchain *chain;  in ccwchain_alloc()  local
322 	chain = kzalloc(sizeof(*chain), GFP_KERNEL);  in ccwchain_alloc()
323 	if (!chain)  in ccwchain_alloc()
326 	chain->ch_ccw = kcalloc(len, sizeof(*chain->ch_ccw), GFP_DMA | GFP_KERNEL);  in ccwchain_alloc()
327 	if (!chain->ch_ccw)  in ccwchain_alloc()
330 	chain->ch_pa = kcalloc(len, sizeof(*chain->ch_pa), GFP_KERNEL);  in ccwchain_alloc()
331 	if (!chain->ch_pa)  in ccwchain_alloc()
334 	list_add_tail(&chain->next, &cp->ccwchain_list);  in ccwchain_alloc()
336 	return chain;  in ccwchain_alloc()
339 	kfree(chain->ch_ccw);  in ccwchain_alloc()
340 	kfree(chain);  in ccwchain_alloc()
344 static void ccwchain_free(struct ccwchain *chain)  in ccwchain_free()  argument
346 	list_del(&chain->next);  in ccwchain_free()
347 	kfree(chain->ch_pa);  in ccwchain_free()
348 	kfree(chain->ch_ccw);  in ccwchain_free()
349 	kfree(chain);  in ccwchain_free()
353 static void ccwchain_cda_free(struct ccwchain *chain, int idx)  in ccwchain_cda_free()  argument
355 	struct ccw1 *ccw = &chain->ch_ccw[idx];  in ccwchain_cda_free()
364  * ccwchain_calc_length - calculate the length of the ccw chain.
365  * @iova: guest physical address of the target ccw chain
368  * This is the chain length not considering any TICs.
374  * Returns: the length of the ccw chain or -errno.
387 		 * that loops back into the current chain.  The latter  in ccwchain_calc_length()
406 	struct ccwchain *chain;  in tic_target_chain_exists()  local
409 	list_for_each_entry(chain, &cp->ccwchain_list, next) {  in tic_target_chain_exists()
410 		ccw_head = chain->ch_iova;  in tic_target_chain_exists()
411 		if (is_cpa_within_range(tic->cda, ccw_head, chain->ch_len))  in tic_target_chain_exists()
418 static int ccwchain_loop_tic(struct ccwchain *chain,
425 	struct ccwchain *chain;  in ccwchain_handle_ccw()  local
439 	/* Count the CCWs in the current chain */  in ccwchain_handle_ccw()
444 	/* Need alloc a new chain for this one. */  in ccwchain_handle_ccw()
445 	chain = ccwchain_alloc(cp, len);  in ccwchain_handle_ccw()
446 	if (!chain)  in ccwchain_handle_ccw()
449 	chain->ch_len = len;  in ccwchain_handle_ccw()
450 	chain->ch_iova = gcda;  in ccwchain_handle_ccw()
452 	/* Copy the actual CCWs into the new chain */  in ccwchain_handle_ccw()
453 	memcpy(chain->ch_ccw, cp->guest_cp, len * sizeof(struct ccw1));  in ccwchain_handle_ccw()
455 	/* Loop for tics on this new chain. */  in ccwchain_handle_ccw()
456 	ret = ccwchain_loop_tic(chain, cp);  in ccwchain_handle_ccw()
459 		ccwchain_free(chain);  in ccwchain_handle_ccw()
465 static int ccwchain_loop_tic(struct ccwchain *chain, struct channel_program *cp)  in ccwchain_loop_tic()  argument
470 	for (i = 0; i < chain->ch_len; i++) {  in ccwchain_loop_tic()
471 		tic = &chain->ch_ccw[i];  in ccwchain_loop_tic()
476 		/* May transfer to an existing chain. */  in ccwchain_loop_tic()
759 	struct ccwchain *chain, *temp;  in cp_free()  local
766 	list_for_each_entry_safe(chain, temp, &cp->ccwchain_list, next) {  in cp_free()
767 		for (i = 0; i < chain->ch_len; i++) {  in cp_free()
768 			page_array_unpin_free(&chain->ch_pa[i], vdev, idal_is_2k(cp));  in cp_free()
769 			ccwchain_cda_free(chain, i);  in cp_free()
771 		ccwchain_free(chain);  in cp_free()
784  * For each chain composing the channel program:
787  * This allows cp_free to find in ch_len the count of CCWs to free in a chain.
790  * as helpers to do ccw chain translation inside the kernel. Basically
814 	struct ccwchain *chain;  in cp_prefetch()  local
823 	list_for_each_entry(chain, &cp->ccwchain_list, next) {  in cp_prefetch()
824 		len = chain->ch_len;  in cp_prefetch()
826 			ccw = &chain->ch_ccw[idx];  in cp_prefetch()
827 			pa = &chain->ch_pa[idx];  in cp_prefetch()
837 	/* Only cleanup the chain elements that were actually translated. */  in cp_prefetch()
838 	chain->ch_len = idx;  in cp_prefetch()
839 	list_for_each_entry_continue(chain, &cp->ccwchain_list, next) {  in cp_prefetch()
840 		chain->ch_len = 0;  in cp_prefetch()
857 	struct ccwchain *chain;  in cp_get_orb()  local
881 	chain = list_first_entry(&cp->ccwchain_list, struct ccwchain, next);  in cp_get_orb()
882 	cpa = chain->ch_ccw;  in cp_get_orb()
904 	struct ccwchain *chain;  in cp_update_scsw()  local
917 	list_for_each_entry(chain, &cp->ccwchain_list, next) {  in cp_update_scsw()
918 		ccw_head = dma32_to_u32(virt_to_dma32(chain->ch_ccw));  in cp_update_scsw()
921 		 * of the chain.  in cp_update_scsw()
923 		if (is_cpa_within_range(cpa, ccw_head, chain->ch_len + 1)) {  in cp_update_scsw()
926 			 * physical ccw to its chain head.  in cp_update_scsw()
927 			 * Adding this value to the guest physical ccw chain  in cp_update_scsw()
929 			 * cpa = chain->ch_iova + (cpa - ccw_head)  in cp_update_scsw()
931 			cpa = dma32_add(cpa, chain->ch_iova - ccw_head);  in cp_update_scsw()
940  * cp_iova_pinned() - check if an iova is pinned for a ccw chain.
945  * If the @iova is currently pinned for the ccw chain, return true;
950 	struct ccwchain *chain;  in cp_iova_pinned()  local
956 	list_for_each_entry(chain, &cp->ccwchain_list, next) {  in cp_iova_pinned()
957 		for (i = 0; i < chain->ch_len; i++)  in cp_iova_pinned()
958 			if (page_array_iova_pinned(&chain->ch_pa[i], iova, length))  in cp_iova_pinned()