1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 *  linux/drivers/net/ethernet/ibm/ehea/ehea_qmr.c
  4 *
  5 *  eHEA ethernet device driver for IBM eServer System p
  6 *
  7 *  (C) Copyright IBM Corp. 2006
  8 *
  9 *  Authors:
 10 *       Christoph Raisch <raisch@de.ibm.com>
 11 *       Jan-Bernd Themann <themann@de.ibm.com>
 12 *       Thomas Klein <tklein@de.ibm.com>
 13 */
 14
 15#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 16
 17#include <linux/mm.h>
 18#include <linux/slab.h>
 19#include "ehea.h"
 20#include "ehea_phyp.h"
 21#include "ehea_qmr.h"
 22
 23static struct ehea_bmap *ehea_bmap;
 24
 25static void *hw_qpageit_get_inc(struct hw_queue *queue)
 26{
 27	void *retvalue = hw_qeit_get(queue);
 28
 29	queue->current_q_offset += queue->pagesize;
 30	if (queue->current_q_offset > queue->queue_length) {
 31		queue->current_q_offset -= queue->pagesize;
 32		retvalue = NULL;
 33	} else if (((u64) retvalue) & (EHEA_PAGESIZE-1)) {
 34		pr_err("not on pageboundary\n");
 35		retvalue = NULL;
 36	}
 37	return retvalue;
 38}
 39
 40static int hw_queue_ctor(struct hw_queue *queue, const u32 nr_of_pages,
 41			  const u32 pagesize, const u32 qe_size)
 42{
 43	int pages_per_kpage = PAGE_SIZE / pagesize;
 44	int i, k;
 45
 46	if ((pagesize > PAGE_SIZE) || (!pages_per_kpage)) {
 47		pr_err("pagesize conflict! kernel pagesize=%d, ehea pagesize=%d\n",
 48		       (int)PAGE_SIZE, (int)pagesize);
 49		return -EINVAL;
 50	}
 51
 52	queue->queue_length = nr_of_pages * pagesize;
 53	queue->queue_pages = kmalloc_array(nr_of_pages, sizeof(void *),
 54					   GFP_KERNEL);
 55	if (!queue->queue_pages)
 56		return -ENOMEM;
 57
 58	/*
 59	 * allocate pages for queue:
 60	 * outer loop allocates whole kernel pages (page aligned) and
 61	 * inner loop divides a kernel page into smaller hea queue pages
 62	 */
 63	i = 0;
 64	while (i < nr_of_pages) {
 65		u8 *kpage = (u8 *)get_zeroed_page(GFP_KERNEL);
 66		if (!kpage)
 67			goto out_nomem;
 68		for (k = 0; k < pages_per_kpage && i < nr_of_pages; k++) {
 69			(queue->queue_pages)[i] = (struct ehea_page *)kpage;
 70			kpage += pagesize;
 71			i++;
 72		}
 73	}
 74
 75	queue->current_q_offset = 0;
 76	queue->qe_size = qe_size;
 77	queue->pagesize = pagesize;
 78	queue->toggle_state = 1;
 79
 80	return 0;
 81out_nomem:
 82	for (i = 0; i < nr_of_pages; i += pages_per_kpage) {
 83		if (!(queue->queue_pages)[i])
 84			break;
 85		free_page((unsigned long)(queue->queue_pages)[i]);
 86	}
 87	return -ENOMEM;
 88}
 89
 90static void hw_queue_dtor(struct hw_queue *queue)
 91{
 92	int pages_per_kpage;
 93	int i, nr_pages;
 94
 95	if (!queue || !queue->queue_pages)
 96		return;
 97
 98	pages_per_kpage = PAGE_SIZE / queue->pagesize;
 99
100	nr_pages = queue->queue_length / queue->pagesize;
101
102	for (i = 0; i < nr_pages; i += pages_per_kpage)
103		free_page((unsigned long)(queue->queue_pages)[i]);
104
105	kfree(queue->queue_pages);
106}
107
108struct ehea_cq *ehea_create_cq(struct ehea_adapter *adapter,
109			       int nr_of_cqe, u64 eq_handle, u32 cq_token)
110{
111	struct ehea_cq *cq;
112	u64 hret, rpage;
113	u32 counter;
114	int ret;
115	void *vpage;
116
117	cq = kzalloc(sizeof(*cq), GFP_KERNEL);
118	if (!cq)
119		goto out_nomem;
120
121	cq->attr.max_nr_of_cqes = nr_of_cqe;
122	cq->attr.cq_token = cq_token;
123	cq->attr.eq_handle = eq_handle;
124
125	cq->adapter = adapter;
126
127	hret = ehea_h_alloc_resource_cq(adapter->handle, &cq->attr,
128					&cq->fw_handle, &cq->epas);
129	if (hret != H_SUCCESS) {
130		pr_err("alloc_resource_cq failed\n");
131		goto out_freemem;
132	}
133
134	ret = hw_queue_ctor(&cq->hw_queue, cq->attr.nr_pages,
135			    EHEA_PAGESIZE, sizeof(struct ehea_cqe));
136	if (ret)
137		goto out_freeres;
138
139	for (counter = 0; counter < cq->attr.nr_pages; counter++) {
140		vpage = hw_qpageit_get_inc(&cq->hw_queue);
141		if (!vpage) {
142			pr_err("hw_qpageit_get_inc failed\n");
143			goto out_kill_hwq;
144		}
145
146		rpage = __pa(vpage);
147		hret = ehea_h_register_rpage(adapter->handle,
148					     0, EHEA_CQ_REGISTER_ORIG,
149					     cq->fw_handle, rpage, 1);
150		if (hret < H_SUCCESS) {
151			pr_err("register_rpage_cq failed ehea_cq=%p hret=%llx counter=%i act_pages=%i\n",
152			       cq, hret, counter, cq->attr.nr_pages);
153			goto out_kill_hwq;
154		}
155
156		if (counter == (cq->attr.nr_pages - 1)) {
157			vpage = hw_qpageit_get_inc(&cq->hw_queue);
158
159			if ((hret != H_SUCCESS) || (vpage)) {
160				pr_err("registration of pages not complete hret=%llx\n",
161				       hret);
162				goto out_kill_hwq;
163			}
164		} else {
165			if (hret != H_PAGE_REGISTERED) {
166				pr_err("CQ: registration of page failed hret=%llx\n",
167				       hret);
168				goto out_kill_hwq;
169			}
170		}
171	}
172
173	hw_qeit_reset(&cq->hw_queue);
174	ehea_reset_cq_ep(cq);
175	ehea_reset_cq_n1(cq);
176
177	return cq;
178
179out_kill_hwq:
180	hw_queue_dtor(&cq->hw_queue);
181
182out_freeres:
183	ehea_h_free_resource(adapter->handle, cq->fw_handle, FORCE_FREE);
184
185out_freemem:
186	kfree(cq);
187
188out_nomem:
189	return NULL;
190}
191
192static u64 ehea_destroy_cq_res(struct ehea_cq *cq, u64 force)
193{
194	u64 hret;
195	u64 adapter_handle = cq->adapter->handle;
196
197	/* deregister all previous registered pages */
198	hret = ehea_h_free_resource(adapter_handle, cq->fw_handle, force);
199	if (hret != H_SUCCESS)
200		return hret;
201
202	hw_queue_dtor(&cq->hw_queue);
203	kfree(cq);
204
205	return hret;
206}
207
208int ehea_destroy_cq(struct ehea_cq *cq)
209{
210	u64 hret, aer, aerr;
211	if (!cq)
212		return 0;
213
214	hcp_epas_dtor(&cq->epas);
215	hret = ehea_destroy_cq_res(cq, NORMAL_FREE);
216	if (hret == H_R_STATE) {
217		ehea_error_data(cq->adapter, cq->fw_handle, &aer, &aerr);
218		hret = ehea_destroy_cq_res(cq, FORCE_FREE);
219	}
220
221	if (hret != H_SUCCESS) {
222		pr_err("destroy CQ failed\n");
223		return -EIO;
224	}
225
226	return 0;
227}
228
229struct ehea_eq *ehea_create_eq(struct ehea_adapter *adapter,
230			       const enum ehea_eq_type type,
231			       const u32 max_nr_of_eqes, const u8 eqe_gen)
232{
233	int ret, i;
234	u64 hret, rpage;
235	void *vpage;
236	struct ehea_eq *eq;
237
238	eq = kzalloc(sizeof(*eq), GFP_KERNEL);
239	if (!eq)
240		return NULL;
241
242	eq->adapter = adapter;
243	eq->attr.type = type;
244	eq->attr.max_nr_of_eqes = max_nr_of_eqes;
245	eq->attr.eqe_gen = eqe_gen;
246	spin_lock_init(&eq->spinlock);
247
248	hret = ehea_h_alloc_resource_eq(adapter->handle,
249					&eq->attr, &eq->fw_handle);
250	if (hret != H_SUCCESS) {
251		pr_err("alloc_resource_eq failed\n");
252		goto out_freemem;
253	}
254
255	ret = hw_queue_ctor(&eq->hw_queue, eq->attr.nr_pages,
256			    EHEA_PAGESIZE, sizeof(struct ehea_eqe));
257	if (ret) {
258		pr_err("can't allocate eq pages\n");
259		goto out_freeres;
260	}
261
262	for (i = 0; i < eq->attr.nr_pages; i++) {
263		vpage = hw_qpageit_get_inc(&eq->hw_queue);
264		if (!vpage) {
265			pr_err("hw_qpageit_get_inc failed\n");
266			hret = H_RESOURCE;
267			goto out_kill_hwq;
268		}
269
270		rpage = __pa(vpage);
271
272		hret = ehea_h_register_rpage(adapter->handle, 0,
273					     EHEA_EQ_REGISTER_ORIG,
274					     eq->fw_handle, rpage, 1);
275
276		if (i == (eq->attr.nr_pages - 1)) {
277			/* last page */
278			vpage = hw_qpageit_get_inc(&eq->hw_queue);
279			if ((hret != H_SUCCESS) || (vpage))
280				goto out_kill_hwq;
281
282		} else {
283			if (hret != H_PAGE_REGISTERED)
284				goto out_kill_hwq;
285
286		}
287	}
288
289	hw_qeit_reset(&eq->hw_queue);
290	return eq;
291
292out_kill_hwq:
293	hw_queue_dtor(&eq->hw_queue);
294
295out_freeres:
296	ehea_h_free_resource(adapter->handle, eq->fw_handle, FORCE_FREE);
297
298out_freemem:
299	kfree(eq);
300	return NULL;
301}
302
303struct ehea_eqe *ehea_poll_eq(struct ehea_eq *eq)
304{
305	struct ehea_eqe *eqe;
306	unsigned long flags;
307
308	spin_lock_irqsave(&eq->spinlock, flags);
309	eqe = hw_eqit_eq_get_inc_valid(&eq->hw_queue);
310	spin_unlock_irqrestore(&eq->spinlock, flags);
311
312	return eqe;
313}
314
315static u64 ehea_destroy_eq_res(struct ehea_eq *eq, u64 force)
316{
317	u64 hret;
318	unsigned long flags;
319
320	spin_lock_irqsave(&eq->spinlock, flags);
321
322	hret = ehea_h_free_resource(eq->adapter->handle, eq->fw_handle, force);
323	spin_unlock_irqrestore(&eq->spinlock, flags);
324
325	if (hret != H_SUCCESS)
326		return hret;
327
328	hw_queue_dtor(&eq->hw_queue);
329	kfree(eq);
330
331	return hret;
332}
333
334int ehea_destroy_eq(struct ehea_eq *eq)
335{
336	u64 hret, aer, aerr;
337	if (!eq)
338		return 0;
339
340	hcp_epas_dtor(&eq->epas);
341
342	hret = ehea_destroy_eq_res(eq, NORMAL_FREE);
343	if (hret == H_R_STATE) {
344		ehea_error_data(eq->adapter, eq->fw_handle, &aer, &aerr);
345		hret = ehea_destroy_eq_res(eq, FORCE_FREE);
346	}
347
348	if (hret != H_SUCCESS) {
349		pr_err("destroy EQ failed\n");
350		return -EIO;
351	}
352
353	return 0;
354}
355
356/* allocates memory for a queue and registers pages in phyp */
357static int ehea_qp_alloc_register(struct ehea_qp *qp, struct hw_queue *hw_queue,
358			   int nr_pages, int wqe_size, int act_nr_sges,
359			   struct ehea_adapter *adapter, int h_call_q_selector)
360{
361	u64 hret, rpage;
362	int ret, cnt;
363	void *vpage;
364
365	ret = hw_queue_ctor(hw_queue, nr_pages, EHEA_PAGESIZE, wqe_size);
366	if (ret)
367		return ret;
368
369	for (cnt = 0; cnt < nr_pages; cnt++) {
370		vpage = hw_qpageit_get_inc(hw_queue);
371		if (!vpage) {
372			pr_err("hw_qpageit_get_inc failed\n");
373			goto out_kill_hwq;
374		}
375		rpage = __pa(vpage);
376		hret = ehea_h_register_rpage(adapter->handle,
377					     0, h_call_q_selector,
378					     qp->fw_handle, rpage, 1);
379		if (hret < H_SUCCESS) {
380			pr_err("register_rpage_qp failed\n");
381			goto out_kill_hwq;
382		}
383	}
384	hw_qeit_reset(hw_queue);
385	return 0;
386
387out_kill_hwq:
388	hw_queue_dtor(hw_queue);
389	return -EIO;
390}
391
392static inline u32 map_wqe_size(u8 wqe_enc_size)
393{
394	return 128 << wqe_enc_size;
395}
396
397struct ehea_qp *ehea_create_qp(struct ehea_adapter *adapter,
398			       u32 pd, struct ehea_qp_init_attr *init_attr)
399{
400	int ret;
401	u64 hret;
402	struct ehea_qp *qp;
403	u32 wqe_size_in_bytes_sq, wqe_size_in_bytes_rq1;
404	u32 wqe_size_in_bytes_rq2, wqe_size_in_bytes_rq3;
405
406
407	qp = kzalloc(sizeof(*qp), GFP_KERNEL);
408	if (!qp)
409		return NULL;
410
411	qp->adapter = adapter;
412
413	hret = ehea_h_alloc_resource_qp(adapter->handle, init_attr, pd,
414					&qp->fw_handle, &qp->epas);
415	if (hret != H_SUCCESS) {
416		pr_err("ehea_h_alloc_resource_qp failed\n");
417		goto out_freemem;
418	}
419
420	wqe_size_in_bytes_sq = map_wqe_size(init_attr->act_wqe_size_enc_sq);
421	wqe_size_in_bytes_rq1 = map_wqe_size(init_attr->act_wqe_size_enc_rq1);
422	wqe_size_in_bytes_rq2 = map_wqe_size(init_attr->act_wqe_size_enc_rq2);
423	wqe_size_in_bytes_rq3 = map_wqe_size(init_attr->act_wqe_size_enc_rq3);
424
425	ret = ehea_qp_alloc_register(qp, &qp->hw_squeue, init_attr->nr_sq_pages,
426				     wqe_size_in_bytes_sq,
427				     init_attr->act_wqe_size_enc_sq, adapter,
428				     0);
429	if (ret) {
430		pr_err("can't register for sq ret=%x\n", ret);
431		goto out_freeres;
432	}
433
434	ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue1,
435				     init_attr->nr_rq1_pages,
436				     wqe_size_in_bytes_rq1,
437				     init_attr->act_wqe_size_enc_rq1,
438				     adapter, 1);
439	if (ret) {
440		pr_err("can't register for rq1 ret=%x\n", ret);
441		goto out_kill_hwsq;
442	}
443
444	if (init_attr->rq_count > 1) {
445		ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue2,
446					     init_attr->nr_rq2_pages,
447					     wqe_size_in_bytes_rq2,
448					     init_attr->act_wqe_size_enc_rq2,
449					     adapter, 2);
450		if (ret) {
451			pr_err("can't register for rq2 ret=%x\n", ret);
452			goto out_kill_hwr1q;
453		}
454	}
455
456	if (init_attr->rq_count > 2) {
457		ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue3,
458					     init_attr->nr_rq3_pages,
459					     wqe_size_in_bytes_rq3,
460					     init_attr->act_wqe_size_enc_rq3,
461					     adapter, 3);
462		if (ret) {
463			pr_err("can't register for rq3 ret=%x\n", ret);
464			goto out_kill_hwr2q;
465		}
466	}
467
468	qp->init_attr = *init_attr;
469
470	return qp;
471
472out_kill_hwr2q:
473	hw_queue_dtor(&qp->hw_rqueue2);
474
475out_kill_hwr1q:
476	hw_queue_dtor(&qp->hw_rqueue1);
477
478out_kill_hwsq:
479	hw_queue_dtor(&qp->hw_squeue);
480
481out_freeres:
482	ehea_h_disable_and_get_hea(adapter->handle, qp->fw_handle);
483	ehea_h_free_resource(adapter->handle, qp->fw_handle, FORCE_FREE);
484
485out_freemem:
486	kfree(qp);
487	return NULL;
488}
489
490static u64 ehea_destroy_qp_res(struct ehea_qp *qp, u64 force)
491{
492	u64 hret;
493	struct ehea_qp_init_attr *qp_attr = &qp->init_attr;
494
495
496	ehea_h_disable_and_get_hea(qp->adapter->handle, qp->fw_handle);
497	hret = ehea_h_free_resource(qp->adapter->handle, qp->fw_handle, force);
498	if (hret != H_SUCCESS)
499		return hret;
500
501	hw_queue_dtor(&qp->hw_squeue);
502	hw_queue_dtor(&qp->hw_rqueue1);
503
504	if (qp_attr->rq_count > 1)
505		hw_queue_dtor(&qp->hw_rqueue2);
506	if (qp_attr->rq_count > 2)
507		hw_queue_dtor(&qp->hw_rqueue3);
508	kfree(qp);
509
510	return hret;
511}
512
513int ehea_destroy_qp(struct ehea_qp *qp)
514{
515	u64 hret, aer, aerr;
516	if (!qp)
517		return 0;
518
519	hcp_epas_dtor(&qp->epas);
520
521	hret = ehea_destroy_qp_res(qp, NORMAL_FREE);
522	if (hret == H_R_STATE) {
523		ehea_error_data(qp->adapter, qp->fw_handle, &aer, &aerr);
524		hret = ehea_destroy_qp_res(qp, FORCE_FREE);
525	}
526
527	if (hret != H_SUCCESS) {
528		pr_err("destroy QP failed\n");
529		return -EIO;
530	}
531
532	return 0;
533}
534
535static inline int ehea_calc_index(unsigned long i, unsigned long s)
536{
537	return (i >> s) & EHEA_INDEX_MASK;
538}
539
540static inline int ehea_init_top_bmap(struct ehea_top_bmap *ehea_top_bmap,
541				     int dir)
542{
543	if (!ehea_top_bmap->dir[dir]) {
544		ehea_top_bmap->dir[dir] =
545			kzalloc(sizeof(struct ehea_dir_bmap), GFP_KERNEL);
546		if (!ehea_top_bmap->dir[dir])
547			return -ENOMEM;
548	}
549	return 0;
550}
551
552static inline int ehea_init_bmap(struct ehea_bmap *ehea_bmap, int top, int dir)
553{
554	if (!ehea_bmap->top[top]) {
555		ehea_bmap->top[top] =
556			kzalloc(sizeof(struct ehea_top_bmap), GFP_KERNEL);
557		if (!ehea_bmap->top[top])
558			return -ENOMEM;
559	}
560	return ehea_init_top_bmap(ehea_bmap->top[top], dir);
561}
562
563static DEFINE_MUTEX(ehea_busmap_mutex);
564static unsigned long ehea_mr_len;
565
566#define EHEA_BUSMAP_ADD_SECT 1
567#define EHEA_BUSMAP_REM_SECT 0
568
569static void ehea_rebuild_busmap(void)
570{
571	u64 vaddr = EHEA_BUSMAP_START;
572	int top, dir, idx;
573
574	for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
575		struct ehea_top_bmap *ehea_top;
576		int valid_dir_entries = 0;
577
578		if (!ehea_bmap->top[top])
579			continue;
580		ehea_top = ehea_bmap->top[top];
581		for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
582			struct ehea_dir_bmap *ehea_dir;
583			int valid_entries = 0;
584
585			if (!ehea_top->dir[dir])
586				continue;
587			valid_dir_entries++;
588			ehea_dir = ehea_top->dir[dir];
589			for (idx = 0; idx < EHEA_MAP_ENTRIES; idx++) {
590				if (!ehea_dir->ent[idx])
591					continue;
592				valid_entries++;
593				ehea_dir->ent[idx] = vaddr;
594				vaddr += EHEA_SECTSIZE;
595			}
596			if (!valid_entries) {
597				ehea_top->dir[dir] = NULL;
598				kfree(ehea_dir);
599			}
600		}
601		if (!valid_dir_entries) {
602			ehea_bmap->top[top] = NULL;
603			kfree(ehea_top);
604		}
605	}
606}
607
608static int ehea_update_busmap(unsigned long pfn, unsigned long nr_pages, int add)
609{
610	unsigned long i, start_section, end_section;
611
612	if (!nr_pages)
613		return 0;
614
615	if (!ehea_bmap) {
616		ehea_bmap = kzalloc(sizeof(struct ehea_bmap), GFP_KERNEL);
617		if (!ehea_bmap)
618			return -ENOMEM;
619	}
620
621	start_section = (pfn * PAGE_SIZE) / EHEA_SECTSIZE;
622	end_section = start_section + ((nr_pages * PAGE_SIZE) / EHEA_SECTSIZE);
623	/* Mark entries as valid or invalid only; address is assigned later */
624	for (i = start_section; i < end_section; i++) {
625		u64 flag;
626		int top = ehea_calc_index(i, EHEA_TOP_INDEX_SHIFT);
627		int dir = ehea_calc_index(i, EHEA_DIR_INDEX_SHIFT);
628		int idx = i & EHEA_INDEX_MASK;
629
630		if (add) {
631			int ret = ehea_init_bmap(ehea_bmap, top, dir);
632			if (ret)
633				return ret;
634			flag = 1; /* valid */
635			ehea_mr_len += EHEA_SECTSIZE;
636		} else {
637			if (!ehea_bmap->top[top])
638				continue;
639			if (!ehea_bmap->top[top]->dir[dir])
640				continue;
641			flag = 0; /* invalid */
642			ehea_mr_len -= EHEA_SECTSIZE;
643		}
644
645		ehea_bmap->top[top]->dir[dir]->ent[idx] = flag;
646	}
647	ehea_rebuild_busmap(); /* Assign contiguous addresses for mr */
648	return 0;
649}
650
651int ehea_add_sect_bmap(unsigned long pfn, unsigned long nr_pages)
652{
653	int ret;
654
655	mutex_lock(&ehea_busmap_mutex);
656	ret = ehea_update_busmap(pfn, nr_pages, EHEA_BUSMAP_ADD_SECT);
657	mutex_unlock(&ehea_busmap_mutex);
658	return ret;
659}
660
661int ehea_rem_sect_bmap(unsigned long pfn, unsigned long nr_pages)
662{
663	int ret;
664
665	mutex_lock(&ehea_busmap_mutex);
666	ret = ehea_update_busmap(pfn, nr_pages, EHEA_BUSMAP_REM_SECT);
667	mutex_unlock(&ehea_busmap_mutex);
668	return ret;
669}
670
671static int ehea_is_hugepage(unsigned long pfn)
672{
 
 
673	if (pfn & EHEA_HUGEPAGE_PFN_MASK)
674		return 0;
675
676	if (page_shift(pfn_to_page(pfn)) != EHEA_HUGEPAGESHIFT)
 
677		return 0;
678
679	return 1;
680}
681
682static int ehea_create_busmap_callback(unsigned long initial_pfn,
683				       unsigned long total_nr_pages, void *arg)
684{
685	int ret;
686	unsigned long pfn, start_pfn, end_pfn, nr_pages;
687
688	if ((total_nr_pages * PAGE_SIZE) < EHEA_HUGEPAGE_SIZE)
689		return ehea_update_busmap(initial_pfn, total_nr_pages,
690					  EHEA_BUSMAP_ADD_SECT);
691
692	/* Given chunk is >= 16GB -> check for hugepages */
693	start_pfn = initial_pfn;
694	end_pfn = initial_pfn + total_nr_pages;
695	pfn = start_pfn;
696
697	while (pfn < end_pfn) {
698		if (ehea_is_hugepage(pfn)) {
699			/* Add mem found in front of the hugepage */
700			nr_pages = pfn - start_pfn;
701			ret = ehea_update_busmap(start_pfn, nr_pages,
702						 EHEA_BUSMAP_ADD_SECT);
703			if (ret)
704				return ret;
705
706			/* Skip the hugepage */
707			pfn += (EHEA_HUGEPAGE_SIZE / PAGE_SIZE);
708			start_pfn = pfn;
709		} else
710			pfn += (EHEA_SECTSIZE / PAGE_SIZE);
711	}
712
713	/* Add mem found behind the hugepage(s)  */
714	nr_pages = pfn - start_pfn;
715	return ehea_update_busmap(start_pfn, nr_pages, EHEA_BUSMAP_ADD_SECT);
716}
717
718int ehea_create_busmap(void)
719{
720	int ret;
721
722	mutex_lock(&ehea_busmap_mutex);
723	ehea_mr_len = 0;
724	ret = walk_system_ram_range(0, 1ULL << MAX_PHYSMEM_BITS, NULL,
725				   ehea_create_busmap_callback);
726	mutex_unlock(&ehea_busmap_mutex);
727	return ret;
728}
729
730void ehea_destroy_busmap(void)
731{
732	int top, dir;
733	mutex_lock(&ehea_busmap_mutex);
734	if (!ehea_bmap)
735		goto out_destroy;
736
737	for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
738		if (!ehea_bmap->top[top])
739			continue;
740
741		for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
742			if (!ehea_bmap->top[top]->dir[dir])
743				continue;
744
745			kfree(ehea_bmap->top[top]->dir[dir]);
746		}
747
748		kfree(ehea_bmap->top[top]);
749	}
750
751	kfree(ehea_bmap);
752	ehea_bmap = NULL;
753out_destroy:
754	mutex_unlock(&ehea_busmap_mutex);
755}
756
757u64 ehea_map_vaddr(void *caddr)
758{
759	int top, dir, idx;
760	unsigned long index, offset;
761
762	if (!ehea_bmap)
763		return EHEA_INVAL_ADDR;
764
765	index = __pa(caddr) >> SECTION_SIZE_BITS;
766	top = (index >> EHEA_TOP_INDEX_SHIFT) & EHEA_INDEX_MASK;
767	if (!ehea_bmap->top[top])
768		return EHEA_INVAL_ADDR;
769
770	dir = (index >> EHEA_DIR_INDEX_SHIFT) & EHEA_INDEX_MASK;
771	if (!ehea_bmap->top[top]->dir[dir])
772		return EHEA_INVAL_ADDR;
773
774	idx = index & EHEA_INDEX_MASK;
775	if (!ehea_bmap->top[top]->dir[dir]->ent[idx])
776		return EHEA_INVAL_ADDR;
777
778	offset = (unsigned long)caddr & (EHEA_SECTSIZE - 1);
779	return ehea_bmap->top[top]->dir[dir]->ent[idx] | offset;
780}
781
782static inline void *ehea_calc_sectbase(int top, int dir, int idx)
783{
784	unsigned long ret = idx;
785	ret |= dir << EHEA_DIR_INDEX_SHIFT;
786	ret |= top << EHEA_TOP_INDEX_SHIFT;
787	return __va(ret << SECTION_SIZE_BITS);
788}
789
790static u64 ehea_reg_mr_section(int top, int dir, int idx, u64 *pt,
791			       struct ehea_adapter *adapter,
792			       struct ehea_mr *mr)
793{
794	void *pg;
795	u64 j, m, hret;
796	unsigned long k = 0;
797	u64 pt_abs = __pa(pt);
798
799	void *sectbase = ehea_calc_sectbase(top, dir, idx);
800
801	for (j = 0; j < (EHEA_PAGES_PER_SECTION / EHEA_MAX_RPAGE); j++) {
802
803		for (m = 0; m < EHEA_MAX_RPAGE; m++) {
804			pg = sectbase + ((k++) * EHEA_PAGESIZE);
805			pt[m] = __pa(pg);
806		}
807		hret = ehea_h_register_rpage_mr(adapter->handle, mr->handle, 0,
808						0, pt_abs, EHEA_MAX_RPAGE);
809
810		if ((hret != H_SUCCESS) &&
811		    (hret != H_PAGE_REGISTERED)) {
812			ehea_h_free_resource(adapter->handle, mr->handle,
813					     FORCE_FREE);
814			pr_err("register_rpage_mr failed\n");
815			return hret;
816		}
817	}
818	return hret;
819}
820
821static u64 ehea_reg_mr_sections(int top, int dir, u64 *pt,
822				struct ehea_adapter *adapter,
823				struct ehea_mr *mr)
824{
825	u64 hret = H_SUCCESS;
826	int idx;
827
828	for (idx = 0; idx < EHEA_MAP_ENTRIES; idx++) {
829		if (!ehea_bmap->top[top]->dir[dir]->ent[idx])
830			continue;
831
832		hret = ehea_reg_mr_section(top, dir, idx, pt, adapter, mr);
833		if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED))
834			return hret;
835	}
836	return hret;
837}
838
839static u64 ehea_reg_mr_dir_sections(int top, u64 *pt,
840				    struct ehea_adapter *adapter,
841				    struct ehea_mr *mr)
842{
843	u64 hret = H_SUCCESS;
844	int dir;
845
846	for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
847		if (!ehea_bmap->top[top]->dir[dir])
848			continue;
849
850		hret = ehea_reg_mr_sections(top, dir, pt, adapter, mr);
851		if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED))
852			return hret;
853	}
854	return hret;
855}
856
857int ehea_reg_kernel_mr(struct ehea_adapter *adapter, struct ehea_mr *mr)
858{
859	int ret;
860	u64 *pt;
861	u64 hret;
862	u32 acc_ctrl = EHEA_MR_ACC_CTRL;
863
864	unsigned long top;
865
866	pt = (void *)get_zeroed_page(GFP_KERNEL);
867	if (!pt) {
868		pr_err("no mem\n");
869		ret = -ENOMEM;
870		goto out;
871	}
872
873	hret = ehea_h_alloc_resource_mr(adapter->handle, EHEA_BUSMAP_START,
874					ehea_mr_len, acc_ctrl, adapter->pd,
875					&mr->handle, &mr->lkey);
876
877	if (hret != H_SUCCESS) {
878		pr_err("alloc_resource_mr failed\n");
879		ret = -EIO;
880		goto out;
881	}
882
883	if (!ehea_bmap) {
884		ehea_h_free_resource(adapter->handle, mr->handle, FORCE_FREE);
885		pr_err("no busmap available\n");
886		ret = -EIO;
887		goto out;
888	}
889
890	for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
891		if (!ehea_bmap->top[top])
892			continue;
893
894		hret = ehea_reg_mr_dir_sections(top, pt, adapter, mr);
895		if((hret != H_PAGE_REGISTERED) && (hret != H_SUCCESS))
896			break;
897	}
898
899	if (hret != H_SUCCESS) {
900		ehea_h_free_resource(adapter->handle, mr->handle, FORCE_FREE);
901		pr_err("registering mr failed\n");
902		ret = -EIO;
903		goto out;
904	}
905
906	mr->vaddr = EHEA_BUSMAP_START;
907	mr->adapter = adapter;
908	ret = 0;
909out:
910	free_page((unsigned long)pt);
911	return ret;
912}
913
914int ehea_rem_mr(struct ehea_mr *mr)
915{
916	u64 hret;
917
918	if (!mr || !mr->adapter)
919		return -EINVAL;
920
921	hret = ehea_h_free_resource(mr->adapter->handle, mr->handle,
922				    FORCE_FREE);
923	if (hret != H_SUCCESS) {
924		pr_err("destroy MR failed\n");
925		return -EIO;
926	}
927
928	return 0;
929}
930
931int ehea_gen_smr(struct ehea_adapter *adapter, struct ehea_mr *old_mr,
932		 struct ehea_mr *shared_mr)
933{
934	u64 hret;
935
936	hret = ehea_h_register_smr(adapter->handle, old_mr->handle,
937				   old_mr->vaddr, EHEA_MR_ACC_CTRL,
938				   adapter->pd, shared_mr);
939	if (hret != H_SUCCESS)
940		return -EIO;
941
942	shared_mr->adapter = adapter;
943
944	return 0;
945}
946
947static void print_error_data(u64 *data)
948{
949	int length;
950	u64 type = EHEA_BMASK_GET(ERROR_DATA_TYPE, data[2]);
951	u64 resource = data[1];
952
953	length = EHEA_BMASK_GET(ERROR_DATA_LENGTH, data[0]);
954
955	if (length > EHEA_PAGESIZE)
956		length = EHEA_PAGESIZE;
957
958	if (type == EHEA_AER_RESTYPE_QP)
959		pr_err("QP (resource=%llX) state: AER=0x%llX, AERR=0x%llX, port=%llX\n",
960		       resource, data[6], data[12], data[22]);
961	else if (type == EHEA_AER_RESTYPE_CQ)
962		pr_err("CQ (resource=%llX) state: AER=0x%llX\n",
963		       resource, data[6]);
964	else if (type == EHEA_AER_RESTYPE_EQ)
965		pr_err("EQ (resource=%llX) state: AER=0x%llX\n",
966		       resource, data[6]);
967
968	ehea_dump(data, length, "error data");
969}
970
971u64 ehea_error_data(struct ehea_adapter *adapter, u64 res_handle,
972		    u64 *aer, u64 *aerr)
973{
974	unsigned long ret;
975	u64 *rblock;
976	u64 type = 0;
977
978	rblock = (void *)get_zeroed_page(GFP_KERNEL);
979	if (!rblock) {
980		pr_err("Cannot allocate rblock memory\n");
981		goto out;
982	}
983
984	ret = ehea_h_error_data(adapter->handle, res_handle, rblock);
985
986	if (ret == H_SUCCESS) {
987		type = EHEA_BMASK_GET(ERROR_DATA_TYPE, rblock[2]);
988		*aer = rblock[6];
989		*aerr = rblock[12];
990		print_error_data(rblock);
991	} else if (ret == H_R_STATE) {
992		pr_err("No error data available: %llX\n", res_handle);
993	} else
994		pr_err("Error data could not be fetched: %llX\n", res_handle);
995
996	free_page((unsigned long)rblock);
997out:
998	return type;
999}