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,
319 	struct ccwchain *chain;  in ccwchain_alloc()  local
321 	chain = kzalloc(sizeof(*chain), GFP_KERNEL);  in ccwchain_alloc()
322 	if (!chain)  in ccwchain_alloc()
325 	chain->ch_ccw = kcalloc(len, sizeof(*chain->ch_ccw), GFP_DMA | GFP_KERNEL);  in ccwchain_alloc()
326 	if (!chain->ch_ccw)  in ccwchain_alloc()
329 	chain->ch_pa = kcalloc(len, sizeof(*chain->ch_pa), GFP_KERNEL);  in ccwchain_alloc()
330 	if (!chain->ch_pa)  in ccwchain_alloc()
333 	list_add_tail(&chain->next, &cp->ccwchain_list);  in ccwchain_alloc()
335 	return chain;  in ccwchain_alloc()
338 	kfree(chain->ch_ccw);  in ccwchain_alloc()
339 	kfree(chain);  in ccwchain_alloc()
343 static void ccwchain_free(struct ccwchain *chain)  in ccwchain_free()  argument
345 	list_del(&chain->next);  in ccwchain_free()
346 	kfree(chain->ch_pa);  in ccwchain_free()
347 	kfree(chain->ch_ccw);  in ccwchain_free()
348 	kfree(chain);  in ccwchain_free()
352 static void ccwchain_cda_free(struct ccwchain *chain, int idx)  in ccwchain_cda_free()  argument
354 	struct ccw1 *ccw = &chain->ch_ccw[idx];  in ccwchain_cda_free()
363  * ccwchain_calc_length - calculate the length of the ccw chain.
364  * @iova: guest physical address of the target ccw chain
367  * This is the chain length not considering any TICs.
373  * Returns: the length of the ccw chain or -errno.
386 		 * that loops back into the current chain.  The latter  in ccwchain_calc_length()
405 	struct ccwchain *chain;  in tic_target_chain_exists()  local
408 	list_for_each_entry(chain, &cp->ccwchain_list, next) {  in tic_target_chain_exists()
409 		ccw_head = chain->ch_iova;  in tic_target_chain_exists()
410 		if (is_cpa_within_range(tic->cda, ccw_head, chain->ch_len))  in tic_target_chain_exists()
417 static int ccwchain_loop_tic(struct ccwchain *chain,
424 	struct ccwchain *chain;  in ccwchain_handle_ccw()  local
436 	/* Count the CCWs in the current chain */  in ccwchain_handle_ccw()
441 	/* Need alloc a new chain for this one. */  in ccwchain_handle_ccw()
442 	chain = ccwchain_alloc(cp, len);  in ccwchain_handle_ccw()
443 	if (!chain)  in ccwchain_handle_ccw()
446 	chain->ch_len = len;  in ccwchain_handle_ccw()
447 	chain->ch_iova = cda;  in ccwchain_handle_ccw()
449 	/* Copy the actual CCWs into the new chain */  in ccwchain_handle_ccw()
450 	memcpy(chain->ch_ccw, cp->guest_cp, len * sizeof(struct ccw1));  in ccwchain_handle_ccw()
452 	/* Loop for tics on this new chain. */  in ccwchain_handle_ccw()
453 	ret = ccwchain_loop_tic(chain, cp);  in ccwchain_handle_ccw()
456 		ccwchain_free(chain);  in ccwchain_handle_ccw()
462 static int ccwchain_loop_tic(struct ccwchain *chain, struct channel_program *cp)  in ccwchain_loop_tic()  argument
467 	for (i = 0; i < chain->ch_len; i++) {  in ccwchain_loop_tic()
468 		tic = &chain->ch_ccw[i];  in ccwchain_loop_tic()
473 		/* May transfer to an existing chain. */  in ccwchain_loop_tic()
753 	struct ccwchain *chain, *temp;  in cp_free()  local
760 	list_for_each_entry_safe(chain, temp, &cp->ccwchain_list, next) {  in cp_free()
761 		for (i = 0; i < chain->ch_len; i++) {  in cp_free()
762 			page_array_unpin_free(&chain->ch_pa[i], vdev, idal_is_2k(cp));  in cp_free()
763 			ccwchain_cda_free(chain, i);  in cp_free()
765 		ccwchain_free(chain);  in cp_free()
778  * For each chain composing the channel program:
781  * This allows cp_free to find in ch_len the count of CCWs to free in a chain.
784  * as helpers to do ccw chain translation inside the kernel. Basically
808 	struct ccwchain *chain;  in cp_prefetch()  local
817 	list_for_each_entry(chain, &cp->ccwchain_list, next) {  in cp_prefetch()
818 		len = chain->ch_len;  in cp_prefetch()
820 			ccw = &chain->ch_ccw[idx];  in cp_prefetch()
821 			pa = &chain->ch_pa[idx];  in cp_prefetch()
831 	/* Only cleanup the chain elements that were actually translated. */  in cp_prefetch()
832 	chain->ch_len = idx;  in cp_prefetch()
833 	list_for_each_entry_continue(chain, &cp->ccwchain_list, next) {  in cp_prefetch()
834 		chain->ch_len = 0;  in cp_prefetch()
851 	struct ccwchain *chain;  in cp_get_orb()  local
875 	chain = list_first_entry(&cp->ccwchain_list, struct ccwchain, next);  in cp_get_orb()
876 	cpa = chain->ch_ccw;  in cp_get_orb()
898 	struct ccwchain *chain;  in cp_update_scsw()  local
911 	list_for_each_entry(chain, &cp->ccwchain_list, next) {  in cp_update_scsw()
912 		ccw_head = (u32)(u64)chain->ch_ccw;  in cp_update_scsw()
915 		 * of the chain.  in cp_update_scsw()
917 		if (is_cpa_within_range(cpa, ccw_head, chain->ch_len + 1)) {  in cp_update_scsw()
920 			 * physical ccw to its chain head.  in cp_update_scsw()
921 			 * Adding this value to the guest physical ccw chain  in cp_update_scsw()
924 			cpa = chain->ch_iova + (cpa - ccw_head);  in cp_update_scsw()
933  * cp_iova_pinned() - check if an iova is pinned for a ccw chain.
938  * If the @iova is currently pinned for the ccw chain, return true;
943 	struct ccwchain *chain;  in cp_iova_pinned()  local
949 	list_for_each_entry(chain, &cp->ccwchain_list, next) {  in cp_iova_pinned()
950 		for (i = 0; i < chain->ch_len; i++)  in cp_iova_pinned()
951 			if (page_array_iova_pinned(&chain->ch_pa[i], iova, length))  in cp_iova_pinned()