walk system ram range
[linux-2.6.git] / drivers / net / ehea / ehea_qmr.c
1 /*
2  *  linux/drivers/net/ehea/ehea_qmr.c
3  *
4  *  eHEA ethernet device driver for IBM eServer System p
5  *
6  *  (C) Copyright IBM Corp. 2006
7  *
8  *  Authors:
9  *       Christoph Raisch <raisch@de.ibm.com>
10  *       Jan-Bernd Themann <themann@de.ibm.com>
11  *       Thomas Klein <tklein@de.ibm.com>
12  *
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License as published by
16  * the Free Software Foundation; either version 2, or (at your option)
17  * any later version.
18  *
19  * This program is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22  * GNU General Public License for more details.
23  *
24  * You should have received a copy of the GNU General Public License
25  * along with this program; if not, write to the Free Software
26  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27  */
28
29 #include <linux/mm.h>
30 #include "ehea.h"
31 #include "ehea_phyp.h"
32 #include "ehea_qmr.h"
33
34 struct ehea_bmap *ehea_bmap = NULL;
35
36
37
38 static void *hw_qpageit_get_inc(struct hw_queue *queue)
39 {
40         void *retvalue = hw_qeit_get(queue);
41
42         queue->current_q_offset += queue->pagesize;
43         if (queue->current_q_offset > queue->queue_length) {
44                 queue->current_q_offset -= queue->pagesize;
45                 retvalue = NULL;
46         } else if (((u64) retvalue) & (EHEA_PAGESIZE-1)) {
47                 ehea_error("not on pageboundary");
48                 retvalue = NULL;
49         }
50         return retvalue;
51 }
52
53 static int hw_queue_ctor(struct hw_queue *queue, const u32 nr_of_pages,
54                           const u32 pagesize, const u32 qe_size)
55 {
56         int pages_per_kpage = PAGE_SIZE / pagesize;
57         int i, k;
58
59         if ((pagesize > PAGE_SIZE) || (!pages_per_kpage)) {
60                 ehea_error("pagesize conflict! kernel pagesize=%d, "
61                            "ehea pagesize=%d", (int)PAGE_SIZE, (int)pagesize);
62                 return -EINVAL;
63         }
64
65         queue->queue_length = nr_of_pages * pagesize;
66         queue->queue_pages = kmalloc(nr_of_pages * sizeof(void *), GFP_KERNEL);
67         if (!queue->queue_pages) {
68                 ehea_error("no mem for queue_pages");
69                 return -ENOMEM;
70         }
71
72         /*
73          * allocate pages for queue:
74          * outer loop allocates whole kernel pages (page aligned) and
75          * inner loop divides a kernel page into smaller hea queue pages
76          */
77         i = 0;
78         while (i < nr_of_pages) {
79                 u8 *kpage = (u8 *)get_zeroed_page(GFP_KERNEL);
80                 if (!kpage)
81                         goto out_nomem;
82                 for (k = 0; k < pages_per_kpage && i < nr_of_pages; k++) {
83                         (queue->queue_pages)[i] = (struct ehea_page *)kpage;
84                         kpage += pagesize;
85                         i++;
86                 }
87         }
88
89         queue->current_q_offset = 0;
90         queue->qe_size = qe_size;
91         queue->pagesize = pagesize;
92         queue->toggle_state = 1;
93
94         return 0;
95 out_nomem:
96         for (i = 0; i < nr_of_pages; i += pages_per_kpage) {
97                 if (!(queue->queue_pages)[i])
98                         break;
99                 free_page((unsigned long)(queue->queue_pages)[i]);
100         }
101         return -ENOMEM;
102 }
103
104 static void hw_queue_dtor(struct hw_queue *queue)
105 {
106         int pages_per_kpage = PAGE_SIZE / queue->pagesize;
107         int i, nr_pages;
108
109         if (!queue || !queue->queue_pages)
110                 return;
111
112         nr_pages = queue->queue_length / queue->pagesize;
113
114         for (i = 0; i < nr_pages; i += pages_per_kpage)
115                 free_page((unsigned long)(queue->queue_pages)[i]);
116
117         kfree(queue->queue_pages);
118 }
119
120 struct ehea_cq *ehea_create_cq(struct ehea_adapter *adapter,
121                                int nr_of_cqe, u64 eq_handle, u32 cq_token)
122 {
123         struct ehea_cq *cq;
124         struct h_epa epa;
125         u64 *cq_handle_ref, hret, rpage;
126         u32 act_nr_of_entries, act_pages, counter;
127         int ret;
128         void *vpage;
129
130         cq = kzalloc(sizeof(*cq), GFP_KERNEL);
131         if (!cq) {
132                 ehea_error("no mem for cq");
133                 goto out_nomem;
134         }
135
136         cq->attr.max_nr_of_cqes = nr_of_cqe;
137         cq->attr.cq_token = cq_token;
138         cq->attr.eq_handle = eq_handle;
139
140         cq->adapter = adapter;
141
142         cq_handle_ref = &cq->fw_handle;
143         act_nr_of_entries = 0;
144         act_pages = 0;
145
146         hret = ehea_h_alloc_resource_cq(adapter->handle, &cq->attr,
147                                         &cq->fw_handle, &cq->epas);
148         if (hret != H_SUCCESS) {
149                 ehea_error("alloc_resource_cq failed");
150                 goto out_freemem;
151         }
152
153         ret = hw_queue_ctor(&cq->hw_queue, cq->attr.nr_pages,
154                             EHEA_PAGESIZE, sizeof(struct ehea_cqe));
155         if (ret)
156                 goto out_freeres;
157
158         for (counter = 0; counter < cq->attr.nr_pages; counter++) {
159                 vpage = hw_qpageit_get_inc(&cq->hw_queue);
160                 if (!vpage) {
161                         ehea_error("hw_qpageit_get_inc failed");
162                         goto out_kill_hwq;
163                 }
164
165                 rpage = virt_to_abs(vpage);
166                 hret = ehea_h_register_rpage(adapter->handle,
167                                              0, EHEA_CQ_REGISTER_ORIG,
168                                              cq->fw_handle, rpage, 1);
169                 if (hret < H_SUCCESS) {
170                         ehea_error("register_rpage_cq failed ehea_cq=%p "
171                                    "hret=%llx counter=%i act_pages=%i",
172                                    cq, hret, counter, cq->attr.nr_pages);
173                         goto out_kill_hwq;
174                 }
175
176                 if (counter == (cq->attr.nr_pages - 1)) {
177                         vpage = hw_qpageit_get_inc(&cq->hw_queue);
178
179                         if ((hret != H_SUCCESS) || (vpage)) {
180                                 ehea_error("registration of pages not "
181                                            "complete hret=%llx\n", hret);
182                                 goto out_kill_hwq;
183                         }
184                 } else {
185                         if (hret != H_PAGE_REGISTERED) {
186                                 ehea_error("CQ: registration of page failed "
187                                            "hret=%llx\n", hret);
188                                 goto out_kill_hwq;
189                         }
190                 }
191         }
192
193         hw_qeit_reset(&cq->hw_queue);
194         epa = cq->epas.kernel;
195         ehea_reset_cq_ep(cq);
196         ehea_reset_cq_n1(cq);
197
198         return cq;
199
200 out_kill_hwq:
201         hw_queue_dtor(&cq->hw_queue);
202
203 out_freeres:
204         ehea_h_free_resource(adapter->handle, cq->fw_handle, FORCE_FREE);
205
206 out_freemem:
207         kfree(cq);
208
209 out_nomem:
210         return NULL;
211 }
212
213 u64 ehea_destroy_cq_res(struct ehea_cq *cq, u64 force)
214 {
215         u64 hret;
216         u64 adapter_handle = cq->adapter->handle;
217
218         /* deregister all previous registered pages */
219         hret = ehea_h_free_resource(adapter_handle, cq->fw_handle, force);
220         if (hret != H_SUCCESS)
221                 return hret;
222
223         hw_queue_dtor(&cq->hw_queue);
224         kfree(cq);
225
226         return hret;
227 }
228
229 int ehea_destroy_cq(struct ehea_cq *cq)
230 {
231         u64 hret;
232         if (!cq)
233                 return 0;
234
235         hcp_epas_dtor(&cq->epas);
236         hret = ehea_destroy_cq_res(cq, NORMAL_FREE);
237         if (hret == H_R_STATE) {
238                 ehea_error_data(cq->adapter, cq->fw_handle);
239                 hret = ehea_destroy_cq_res(cq, FORCE_FREE);
240         }
241
242         if (hret != H_SUCCESS) {
243                 ehea_error("destroy CQ failed");
244                 return -EIO;
245         }
246
247         return 0;
248 }
249
250 struct ehea_eq *ehea_create_eq(struct ehea_adapter *adapter,
251                                const enum ehea_eq_type type,
252                                const u32 max_nr_of_eqes, const u8 eqe_gen)
253 {
254         int ret, i;
255         u64 hret, rpage;
256         void *vpage;
257         struct ehea_eq *eq;
258
259         eq = kzalloc(sizeof(*eq), GFP_KERNEL);
260         if (!eq) {
261                 ehea_error("no mem for eq");
262                 return NULL;
263         }
264
265         eq->adapter = adapter;
266         eq->attr.type = type;
267         eq->attr.max_nr_of_eqes = max_nr_of_eqes;
268         eq->attr.eqe_gen = eqe_gen;
269         spin_lock_init(&eq->spinlock);
270
271         hret = ehea_h_alloc_resource_eq(adapter->handle,
272                                         &eq->attr, &eq->fw_handle);
273         if (hret != H_SUCCESS) {
274                 ehea_error("alloc_resource_eq failed");
275                 goto out_freemem;
276         }
277
278         ret = hw_queue_ctor(&eq->hw_queue, eq->attr.nr_pages,
279                             EHEA_PAGESIZE, sizeof(struct ehea_eqe));
280         if (ret) {
281                 ehea_error("can't allocate eq pages");
282                 goto out_freeres;
283         }
284
285         for (i = 0; i < eq->attr.nr_pages; i++) {
286                 vpage = hw_qpageit_get_inc(&eq->hw_queue);
287                 if (!vpage) {
288                         ehea_error("hw_qpageit_get_inc failed");
289                         hret = H_RESOURCE;
290                         goto out_kill_hwq;
291                 }
292
293                 rpage = virt_to_abs(vpage);
294
295                 hret = ehea_h_register_rpage(adapter->handle, 0,
296                                              EHEA_EQ_REGISTER_ORIG,
297                                              eq->fw_handle, rpage, 1);
298
299                 if (i == (eq->attr.nr_pages - 1)) {
300                         /* last page */
301                         vpage = hw_qpageit_get_inc(&eq->hw_queue);
302                         if ((hret != H_SUCCESS) || (vpage))
303                                 goto out_kill_hwq;
304
305                 } else {
306                         if (hret != H_PAGE_REGISTERED)
307                                 goto out_kill_hwq;
308
309                 }
310         }
311
312         hw_qeit_reset(&eq->hw_queue);
313         return eq;
314
315 out_kill_hwq:
316         hw_queue_dtor(&eq->hw_queue);
317
318 out_freeres:
319         ehea_h_free_resource(adapter->handle, eq->fw_handle, FORCE_FREE);
320
321 out_freemem:
322         kfree(eq);
323         return NULL;
324 }
325
326 struct ehea_eqe *ehea_poll_eq(struct ehea_eq *eq)
327 {
328         struct ehea_eqe *eqe;
329         unsigned long flags;
330
331         spin_lock_irqsave(&eq->spinlock, flags);
332         eqe = (struct ehea_eqe *)hw_eqit_eq_get_inc_valid(&eq->hw_queue);
333         spin_unlock_irqrestore(&eq->spinlock, flags);
334
335         return eqe;
336 }
337
338 u64 ehea_destroy_eq_res(struct ehea_eq *eq, u64 force)
339 {
340         u64 hret;
341         unsigned long flags;
342
343         spin_lock_irqsave(&eq->spinlock, flags);
344
345         hret = ehea_h_free_resource(eq->adapter->handle, eq->fw_handle, force);
346         spin_unlock_irqrestore(&eq->spinlock, flags);
347
348         if (hret != H_SUCCESS)
349                 return hret;
350
351         hw_queue_dtor(&eq->hw_queue);
352         kfree(eq);
353
354         return hret;
355 }
356
357 int ehea_destroy_eq(struct ehea_eq *eq)
358 {
359         u64 hret;
360         if (!eq)
361                 return 0;
362
363         hcp_epas_dtor(&eq->epas);
364
365         hret = ehea_destroy_eq_res(eq, NORMAL_FREE);
366         if (hret == H_R_STATE) {
367                 ehea_error_data(eq->adapter, eq->fw_handle);
368                 hret = ehea_destroy_eq_res(eq, FORCE_FREE);
369         }
370
371         if (hret != H_SUCCESS) {
372                 ehea_error("destroy EQ failed");
373                 return -EIO;
374         }
375
376         return 0;
377 }
378
379 /**
380  * allocates memory for a queue and registers pages in phyp
381  */
382 int ehea_qp_alloc_register(struct ehea_qp *qp, struct hw_queue *hw_queue,
383                            int nr_pages, int wqe_size, int act_nr_sges,
384                            struct ehea_adapter *adapter, int h_call_q_selector)
385 {
386         u64 hret, rpage;
387         int ret, cnt;
388         void *vpage;
389
390         ret = hw_queue_ctor(hw_queue, nr_pages, EHEA_PAGESIZE, wqe_size);
391         if (ret)
392                 return ret;
393
394         for (cnt = 0; cnt < nr_pages; cnt++) {
395                 vpage = hw_qpageit_get_inc(hw_queue);
396                 if (!vpage) {
397                         ehea_error("hw_qpageit_get_inc failed");
398                         goto out_kill_hwq;
399                 }
400                 rpage = virt_to_abs(vpage);
401                 hret = ehea_h_register_rpage(adapter->handle,
402                                              0, h_call_q_selector,
403                                              qp->fw_handle, rpage, 1);
404                 if (hret < H_SUCCESS) {
405                         ehea_error("register_rpage_qp failed");
406                         goto out_kill_hwq;
407                 }
408         }
409         hw_qeit_reset(hw_queue);
410         return 0;
411
412 out_kill_hwq:
413         hw_queue_dtor(hw_queue);
414         return -EIO;
415 }
416
417 static inline u32 map_wqe_size(u8 wqe_enc_size)
418 {
419         return 128 << wqe_enc_size;
420 }
421
422 struct ehea_qp *ehea_create_qp(struct ehea_adapter *adapter,
423                                u32 pd, struct ehea_qp_init_attr *init_attr)
424 {
425         int ret;
426         u64 hret;
427         struct ehea_qp *qp;
428         u32 wqe_size_in_bytes_sq, wqe_size_in_bytes_rq1;
429         u32 wqe_size_in_bytes_rq2, wqe_size_in_bytes_rq3;
430
431
432         qp = kzalloc(sizeof(*qp), GFP_KERNEL);
433         if (!qp) {
434                 ehea_error("no mem for qp");
435                 return NULL;
436         }
437
438         qp->adapter = adapter;
439
440         hret = ehea_h_alloc_resource_qp(adapter->handle, init_attr, pd,
441                                         &qp->fw_handle, &qp->epas);
442         if (hret != H_SUCCESS) {
443                 ehea_error("ehea_h_alloc_resource_qp failed");
444                 goto out_freemem;
445         }
446
447         wqe_size_in_bytes_sq = map_wqe_size(init_attr->act_wqe_size_enc_sq);
448         wqe_size_in_bytes_rq1 = map_wqe_size(init_attr->act_wqe_size_enc_rq1);
449         wqe_size_in_bytes_rq2 = map_wqe_size(init_attr->act_wqe_size_enc_rq2);
450         wqe_size_in_bytes_rq3 = map_wqe_size(init_attr->act_wqe_size_enc_rq3);
451
452         ret = ehea_qp_alloc_register(qp, &qp->hw_squeue, init_attr->nr_sq_pages,
453                                      wqe_size_in_bytes_sq,
454                                      init_attr->act_wqe_size_enc_sq, adapter,
455                                      0);
456         if (ret) {
457                 ehea_error("can't register for sq ret=%x", ret);
458                 goto out_freeres;
459         }
460
461         ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue1,
462                                      init_attr->nr_rq1_pages,
463                                      wqe_size_in_bytes_rq1,
464                                      init_attr->act_wqe_size_enc_rq1,
465                                      adapter, 1);
466         if (ret) {
467                 ehea_error("can't register for rq1 ret=%x", ret);
468                 goto out_kill_hwsq;
469         }
470
471         if (init_attr->rq_count > 1) {
472                 ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue2,
473                                              init_attr->nr_rq2_pages,
474                                              wqe_size_in_bytes_rq2,
475                                              init_attr->act_wqe_size_enc_rq2,
476                                              adapter, 2);
477                 if (ret) {
478                         ehea_error("can't register for rq2 ret=%x", ret);
479                         goto out_kill_hwr1q;
480                 }
481         }
482
483         if (init_attr->rq_count > 2) {
484                 ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue3,
485                                              init_attr->nr_rq3_pages,
486                                              wqe_size_in_bytes_rq3,
487                                              init_attr->act_wqe_size_enc_rq3,
488                                              adapter, 3);
489                 if (ret) {
490                         ehea_error("can't register for rq3 ret=%x", ret);
491                         goto out_kill_hwr2q;
492                 }
493         }
494
495         qp->init_attr = *init_attr;
496
497         return qp;
498
499 out_kill_hwr2q:
500         hw_queue_dtor(&qp->hw_rqueue2);
501
502 out_kill_hwr1q:
503         hw_queue_dtor(&qp->hw_rqueue1);
504
505 out_kill_hwsq:
506         hw_queue_dtor(&qp->hw_squeue);
507
508 out_freeres:
509         ehea_h_disable_and_get_hea(adapter->handle, qp->fw_handle);
510         ehea_h_free_resource(adapter->handle, qp->fw_handle, FORCE_FREE);
511
512 out_freemem:
513         kfree(qp);
514         return NULL;
515 }
516
517 u64 ehea_destroy_qp_res(struct ehea_qp *qp, u64 force)
518 {
519         u64 hret;
520         struct ehea_qp_init_attr *qp_attr = &qp->init_attr;
521
522
523         ehea_h_disable_and_get_hea(qp->adapter->handle, qp->fw_handle);
524         hret = ehea_h_free_resource(qp->adapter->handle, qp->fw_handle, force);
525         if (hret != H_SUCCESS)
526                 return hret;
527
528         hw_queue_dtor(&qp->hw_squeue);
529         hw_queue_dtor(&qp->hw_rqueue1);
530
531         if (qp_attr->rq_count > 1)
532                 hw_queue_dtor(&qp->hw_rqueue2);
533         if (qp_attr->rq_count > 2)
534                 hw_queue_dtor(&qp->hw_rqueue3);
535         kfree(qp);
536
537         return hret;
538 }
539
540 int ehea_destroy_qp(struct ehea_qp *qp)
541 {
542         u64 hret;
543         if (!qp)
544                 return 0;
545
546         hcp_epas_dtor(&qp->epas);
547
548         hret = ehea_destroy_qp_res(qp, NORMAL_FREE);
549         if (hret == H_R_STATE) {
550                 ehea_error_data(qp->adapter, qp->fw_handle);
551                 hret = ehea_destroy_qp_res(qp, FORCE_FREE);
552         }
553
554         if (hret != H_SUCCESS) {
555                 ehea_error("destroy QP failed");
556                 return -EIO;
557         }
558
559         return 0;
560 }
561
562 static inline int ehea_calc_index(unsigned long i, unsigned long s)
563 {
564         return (i >> s) & EHEA_INDEX_MASK;
565 }
566
567 static inline int ehea_init_top_bmap(struct ehea_top_bmap *ehea_top_bmap,
568                                      int dir)
569 {
570         if (!ehea_top_bmap->dir[dir]) {
571                 ehea_top_bmap->dir[dir] =
572                         kzalloc(sizeof(struct ehea_dir_bmap), GFP_KERNEL);
573                 if (!ehea_top_bmap->dir[dir])
574                         return -ENOMEM;
575         }
576         return 0;
577 }
578
579 static inline int ehea_init_bmap(struct ehea_bmap *ehea_bmap, int top, int dir)
580 {
581         if (!ehea_bmap->top[top]) {
582                 ehea_bmap->top[top] =
583                         kzalloc(sizeof(struct ehea_top_bmap), GFP_KERNEL);
584                 if (!ehea_bmap->top[top])
585                         return -ENOMEM;
586         }
587         return ehea_init_top_bmap(ehea_bmap->top[top], dir);
588 }
589
590 static DEFINE_MUTEX(ehea_busmap_mutex);
591 static unsigned long ehea_mr_len;
592
593 #define EHEA_BUSMAP_ADD_SECT 1
594 #define EHEA_BUSMAP_REM_SECT 0
595
596 static void ehea_rebuild_busmap(void)
597 {
598         u64 vaddr = EHEA_BUSMAP_START;
599         int top, dir, idx;
600
601         for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
602                 struct ehea_top_bmap *ehea_top;
603                 int valid_dir_entries = 0;
604
605                 if (!ehea_bmap->top[top])
606                         continue;
607                 ehea_top = ehea_bmap->top[top];
608                 for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
609                         struct ehea_dir_bmap *ehea_dir;
610                         int valid_entries = 0;
611
612                         if (!ehea_top->dir[dir])
613                                 continue;
614                         valid_dir_entries++;
615                         ehea_dir = ehea_top->dir[dir];
616                         for (idx = 0; idx < EHEA_MAP_ENTRIES; idx++) {
617                                 if (!ehea_dir->ent[idx])
618                                         continue;
619                                 valid_entries++;
620                                 ehea_dir->ent[idx] = vaddr;
621                                 vaddr += EHEA_SECTSIZE;
622                         }
623                         if (!valid_entries) {
624                                 ehea_top->dir[dir] = NULL;
625                                 kfree(ehea_dir);
626                         }
627                 }
628                 if (!valid_dir_entries) {
629                         ehea_bmap->top[top] = NULL;
630                         kfree(ehea_top);
631                 }
632         }
633 }
634
635 static int ehea_update_busmap(unsigned long pfn, unsigned long nr_pages, int add)
636 {
637         unsigned long i, start_section, end_section;
638
639         if (!nr_pages)
640                 return 0;
641
642         if (!ehea_bmap) {
643                 ehea_bmap = kzalloc(sizeof(struct ehea_bmap), GFP_KERNEL);
644                 if (!ehea_bmap)
645                         return -ENOMEM;
646         }
647
648         start_section = (pfn * PAGE_SIZE) / EHEA_SECTSIZE;
649         end_section = start_section + ((nr_pages * PAGE_SIZE) / EHEA_SECTSIZE);
650         /* Mark entries as valid or invalid only; address is assigned later */
651         for (i = start_section; i < end_section; i++) {
652                 u64 flag;
653                 int top = ehea_calc_index(i, EHEA_TOP_INDEX_SHIFT);
654                 int dir = ehea_calc_index(i, EHEA_DIR_INDEX_SHIFT);
655                 int idx = i & EHEA_INDEX_MASK;
656
657                 if (add) {
658                         int ret = ehea_init_bmap(ehea_bmap, top, dir);
659                         if (ret)
660                                 return ret;
661                         flag = 1; /* valid */
662                         ehea_mr_len += EHEA_SECTSIZE;
663                 } else {
664                         if (!ehea_bmap->top[top])
665                                 continue;
666                         if (!ehea_bmap->top[top]->dir[dir])
667                                 continue;
668                         flag = 0; /* invalid */
669                         ehea_mr_len -= EHEA_SECTSIZE;
670                 }
671
672                 ehea_bmap->top[top]->dir[dir]->ent[idx] = flag;
673         }
674         ehea_rebuild_busmap(); /* Assign contiguous addresses for mr */
675         return 0;
676 }
677
678 int ehea_add_sect_bmap(unsigned long pfn, unsigned long nr_pages)
679 {
680         int ret;
681
682         mutex_lock(&ehea_busmap_mutex);
683         ret = ehea_update_busmap(pfn, nr_pages, EHEA_BUSMAP_ADD_SECT);
684         mutex_unlock(&ehea_busmap_mutex);
685         return ret;
686 }
687
688 int ehea_rem_sect_bmap(unsigned long pfn, unsigned long nr_pages)
689 {
690         int ret;
691
692         mutex_lock(&ehea_busmap_mutex);
693         ret = ehea_update_busmap(pfn, nr_pages, EHEA_BUSMAP_REM_SECT);
694         mutex_unlock(&ehea_busmap_mutex);
695         return ret;
696 }
697
698 static int ehea_is_hugepage(unsigned long pfn)
699 {
700         int page_order;
701
702         if (pfn & EHEA_HUGEPAGE_PFN_MASK)
703                 return 0;
704
705         page_order = compound_order(pfn_to_page(pfn));
706         if (page_order + PAGE_SHIFT != EHEA_HUGEPAGESHIFT)
707                 return 0;
708
709         return 1;
710 }
711
712 static int ehea_create_busmap_callback(unsigned long initial_pfn,
713                                        unsigned long total_nr_pages, void *arg)
714 {
715         int ret;
716         unsigned long pfn, start_pfn, end_pfn, nr_pages;
717
718         if ((total_nr_pages * PAGE_SIZE) < EHEA_HUGEPAGE_SIZE)
719                 return ehea_update_busmap(initial_pfn, total_nr_pages,
720                                           EHEA_BUSMAP_ADD_SECT);
721
722         /* Given chunk is >= 16GB -> check for hugepages */
723         start_pfn = initial_pfn;
724         end_pfn = initial_pfn + total_nr_pages;
725         pfn = start_pfn;
726
727         while (pfn < end_pfn) {
728                 if (ehea_is_hugepage(pfn)) {
729                         /* Add mem found in front of the hugepage */
730                         nr_pages = pfn - start_pfn;
731                         ret = ehea_update_busmap(start_pfn, nr_pages,
732                                                  EHEA_BUSMAP_ADD_SECT);
733                         if (ret)
734                                 return ret;
735
736                         /* Skip the hugepage */
737                         pfn += (EHEA_HUGEPAGE_SIZE / PAGE_SIZE);
738                         start_pfn = pfn;
739                 } else
740                         pfn += (EHEA_SECTSIZE / PAGE_SIZE);
741         }
742
743         /* Add mem found behind the hugepage(s)  */
744         nr_pages = pfn - start_pfn;
745         return ehea_update_busmap(start_pfn, nr_pages, EHEA_BUSMAP_ADD_SECT);
746 }
747
748 int ehea_create_busmap(void)
749 {
750         int ret;
751
752         mutex_lock(&ehea_busmap_mutex);
753         ehea_mr_len = 0;
754         ret = walk_system_ram_range(0, 1ULL << MAX_PHYSMEM_BITS, NULL,
755                                    ehea_create_busmap_callback);
756         mutex_unlock(&ehea_busmap_mutex);
757         return ret;
758 }
759
760 void ehea_destroy_busmap(void)
761 {
762         int top, dir;
763         mutex_lock(&ehea_busmap_mutex);
764         if (!ehea_bmap)
765                 goto out_destroy;
766
767         for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
768                 if (!ehea_bmap->top[top])
769                         continue;
770
771                 for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
772                         if (!ehea_bmap->top[top]->dir[dir])
773                                 continue;
774
775                         kfree(ehea_bmap->top[top]->dir[dir]);
776                 }
777
778                 kfree(ehea_bmap->top[top]);
779         }
780
781         kfree(ehea_bmap);
782         ehea_bmap = NULL;
783 out_destroy:
784         mutex_unlock(&ehea_busmap_mutex);
785 }
786
787 u64 ehea_map_vaddr(void *caddr)
788 {
789         int top, dir, idx;
790         unsigned long index, offset;
791
792         if (!ehea_bmap)
793                 return EHEA_INVAL_ADDR;
794
795         index = virt_to_abs(caddr) >> SECTION_SIZE_BITS;
796         top = (index >> EHEA_TOP_INDEX_SHIFT) & EHEA_INDEX_MASK;
797         if (!ehea_bmap->top[top])
798                 return EHEA_INVAL_ADDR;
799
800         dir = (index >> EHEA_DIR_INDEX_SHIFT) & EHEA_INDEX_MASK;
801         if (!ehea_bmap->top[top]->dir[dir])
802                 return EHEA_INVAL_ADDR;
803
804         idx = index & EHEA_INDEX_MASK;
805         if (!ehea_bmap->top[top]->dir[dir]->ent[idx])
806                 return EHEA_INVAL_ADDR;
807
808         offset = (unsigned long)caddr & (EHEA_SECTSIZE - 1);
809         return ehea_bmap->top[top]->dir[dir]->ent[idx] | offset;
810 }
811
812 static inline void *ehea_calc_sectbase(int top, int dir, int idx)
813 {
814         unsigned long ret = idx;
815         ret |= dir << EHEA_DIR_INDEX_SHIFT;
816         ret |= top << EHEA_TOP_INDEX_SHIFT;
817         return abs_to_virt(ret << SECTION_SIZE_BITS);
818 }
819
820 static u64 ehea_reg_mr_section(int top, int dir, int idx, u64 *pt,
821                                struct ehea_adapter *adapter,
822                                struct ehea_mr *mr)
823 {
824         void *pg;
825         u64 j, m, hret;
826         unsigned long k = 0;
827         u64 pt_abs = virt_to_abs(pt);
828
829         void *sectbase = ehea_calc_sectbase(top, dir, idx);
830
831         for (j = 0; j < (EHEA_PAGES_PER_SECTION / EHEA_MAX_RPAGE); j++) {
832
833                 for (m = 0; m < EHEA_MAX_RPAGE; m++) {
834                         pg = sectbase + ((k++) * EHEA_PAGESIZE);
835                         pt[m] = virt_to_abs(pg);
836                 }
837                 hret = ehea_h_register_rpage_mr(adapter->handle, mr->handle, 0,
838                                                 0, pt_abs, EHEA_MAX_RPAGE);
839
840                 if ((hret != H_SUCCESS)
841                     && (hret != H_PAGE_REGISTERED)) {
842                         ehea_h_free_resource(adapter->handle, mr->handle,
843                                              FORCE_FREE);
844                         ehea_error("register_rpage_mr failed");
845                         return hret;
846                 }
847         }
848         return hret;
849 }
850
851 static u64 ehea_reg_mr_sections(int top, int dir, u64 *pt,
852                                 struct ehea_adapter *adapter,
853                                 struct ehea_mr *mr)
854 {
855         u64 hret = H_SUCCESS;
856         int idx;
857
858         for (idx = 0; idx < EHEA_MAP_ENTRIES; idx++) {
859                 if (!ehea_bmap->top[top]->dir[dir]->ent[idx])
860                         continue;
861
862                 hret = ehea_reg_mr_section(top, dir, idx, pt, adapter, mr);
863                 if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED))
864                         return hret;
865         }
866         return hret;
867 }
868
869 static u64 ehea_reg_mr_dir_sections(int top, u64 *pt,
870                                     struct ehea_adapter *adapter,
871                                     struct ehea_mr *mr)
872 {
873         u64 hret = H_SUCCESS;
874         int dir;
875
876         for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
877                 if (!ehea_bmap->top[top]->dir[dir])
878                         continue;
879
880                 hret = ehea_reg_mr_sections(top, dir, pt, adapter, mr);
881                 if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED))
882                         return hret;
883         }
884         return hret;
885 }
886
887 int ehea_reg_kernel_mr(struct ehea_adapter *adapter, struct ehea_mr *mr)
888 {
889         int ret;
890         u64 *pt;
891         u64 hret;
892         u32 acc_ctrl = EHEA_MR_ACC_CTRL;
893
894         unsigned long top;
895
896         pt = (void *)get_zeroed_page(GFP_KERNEL);
897         if (!pt) {
898                 ehea_error("no mem");
899                 ret = -ENOMEM;
900                 goto out;
901         }
902
903         hret = ehea_h_alloc_resource_mr(adapter->handle, EHEA_BUSMAP_START,
904                                         ehea_mr_len, acc_ctrl, adapter->pd,
905                                         &mr->handle, &mr->lkey);
906
907         if (hret != H_SUCCESS) {
908                 ehea_error("alloc_resource_mr failed");
909                 ret = -EIO;
910                 goto out;
911         }
912
913         if (!ehea_bmap) {
914                 ehea_h_free_resource(adapter->handle, mr->handle, FORCE_FREE);
915                 ehea_error("no busmap available");
916                 ret = -EIO;
917                 goto out;
918         }
919
920         for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
921                 if (!ehea_bmap->top[top])
922                         continue;
923
924                 hret = ehea_reg_mr_dir_sections(top, pt, adapter, mr);
925                 if((hret != H_PAGE_REGISTERED) && (hret != H_SUCCESS))
926                         break;
927         }
928
929         if (hret != H_SUCCESS) {
930                 ehea_h_free_resource(adapter->handle, mr->handle, FORCE_FREE);
931                 ehea_error("registering mr failed");
932                 ret = -EIO;
933                 goto out;
934         }
935
936         mr->vaddr = EHEA_BUSMAP_START;
937         mr->adapter = adapter;
938         ret = 0;
939 out:
940         free_page((unsigned long)pt);
941         return ret;
942 }
943
944 int ehea_rem_mr(struct ehea_mr *mr)
945 {
946         u64 hret;
947
948         if (!mr || !mr->adapter)
949                 return -EINVAL;
950
951         hret = ehea_h_free_resource(mr->adapter->handle, mr->handle,
952                                     FORCE_FREE);
953         if (hret != H_SUCCESS) {
954                 ehea_error("destroy MR failed");
955                 return -EIO;
956         }
957
958         return 0;
959 }
960
961 int ehea_gen_smr(struct ehea_adapter *adapter, struct ehea_mr *old_mr,
962                  struct ehea_mr *shared_mr)
963 {
964         u64 hret;
965
966         hret = ehea_h_register_smr(adapter->handle, old_mr->handle,
967                                    old_mr->vaddr, EHEA_MR_ACC_CTRL,
968                                    adapter->pd, shared_mr);
969         if (hret != H_SUCCESS)
970                 return -EIO;
971
972         shared_mr->adapter = adapter;
973
974         return 0;
975 }
976
977 void print_error_data(u64 *data)
978 {
979         int length;
980         u64 type = EHEA_BMASK_GET(ERROR_DATA_TYPE, data[2]);
981         u64 resource = data[1];
982
983         length = EHEA_BMASK_GET(ERROR_DATA_LENGTH, data[0]);
984
985         if (length > EHEA_PAGESIZE)
986                 length = EHEA_PAGESIZE;
987
988         if (type == 0x8) /* Queue Pair */
989                 ehea_error("QP (resource=%llX) state: AER=0x%llX, AERR=0x%llX, "
990                            "port=%llX", resource, data[6], data[12], data[22]);
991
992         if (type == 0x4) /* Completion Queue */
993                 ehea_error("CQ (resource=%llX) state: AER=0x%llX", resource,
994                            data[6]);
995
996         if (type == 0x3) /* Event Queue */
997                 ehea_error("EQ (resource=%llX) state: AER=0x%llX", resource,
998                            data[6]);
999
1000         ehea_dump(data, length, "error data");
1001 }
1002
1003 void ehea_error_data(struct ehea_adapter *adapter, u64 res_handle)
1004 {
1005         unsigned long ret;
1006         u64 *rblock;
1007
1008         rblock = (void *)get_zeroed_page(GFP_KERNEL);
1009         if (!rblock) {
1010                 ehea_error("Cannot allocate rblock memory.");
1011                 return;
1012         }
1013
1014         ret = ehea_h_error_data(adapter->handle,
1015                                 res_handle,
1016                                 rblock);
1017
1018         if (ret == H_R_STATE)
1019                 ehea_error("No error data is available: %llX.", res_handle);
1020         else if (ret == H_SUCCESS)
1021                 print_error_data(rblock);
1022         else
1023                 ehea_error("Error data could not be fetched: %llX", res_handle);
1024
1025         free_page((unsigned long)rblock);
1026 }