Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee13...
[linux-2.6] / 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 "ehea.h"
30 #include "ehea_phyp.h"
31 #include "ehea_qmr.h"
32
33 static void *hw_qpageit_get_inc(struct hw_queue *queue)
34 {
35         void *retvalue = hw_qeit_get(queue);
36
37         queue->current_q_offset += queue->pagesize;
38         if (queue->current_q_offset > queue->queue_length) {
39                 queue->current_q_offset -= queue->pagesize;
40                 retvalue = NULL;
41         } else if (((u64) retvalue) & (EHEA_PAGESIZE-1)) {
42                 ehea_error("not on pageboundary");
43                 retvalue = NULL;
44         }
45         return retvalue;
46 }
47
48 static int hw_queue_ctor(struct hw_queue *queue, const u32 nr_of_pages,
49                           const u32 pagesize, const u32 qe_size)
50 {
51         int pages_per_kpage = PAGE_SIZE / pagesize;
52         int i, k;
53
54         if ((pagesize > PAGE_SIZE) || (!pages_per_kpage)) {
55                 ehea_error("pagesize conflict! kernel pagesize=%d, "
56                            "ehea pagesize=%d", (int)PAGE_SIZE, (int)pagesize);
57                 return -EINVAL;
58         }
59
60         queue->queue_length = nr_of_pages * pagesize;
61         queue->queue_pages = kmalloc(nr_of_pages * sizeof(void*), GFP_KERNEL);
62         if (!queue->queue_pages) {
63                 ehea_error("no mem for queue_pages");
64                 return -ENOMEM;
65         }
66
67         /*
68          * allocate pages for queue:
69          * outer loop allocates whole kernel pages (page aligned) and
70          * inner loop divides a kernel page into smaller hea queue pages
71          */
72         i = 0;
73         while (i < nr_of_pages) {
74                 u8 *kpage = (u8*)get_zeroed_page(GFP_KERNEL);
75                 if (!kpage)
76                         goto out_nomem;
77                 for (k = 0; k < pages_per_kpage && i < nr_of_pages; k++) {
78                         (queue->queue_pages)[i] = (struct ehea_page*)kpage;
79                         kpage += pagesize;
80                         i++;
81                 }
82         }
83
84         queue->current_q_offset = 0;
85         queue->qe_size = qe_size;
86         queue->pagesize = pagesize;
87         queue->toggle_state = 1;
88
89         return 0;
90 out_nomem:
91         for (i = 0; i < nr_of_pages; i += pages_per_kpage) {
92                 if (!(queue->queue_pages)[i])
93                         break;
94                 free_page((unsigned long)(queue->queue_pages)[i]);
95         }
96         return -ENOMEM;
97 }
98
99 static void hw_queue_dtor(struct hw_queue *queue)
100 {
101         int pages_per_kpage = PAGE_SIZE / queue->pagesize;
102         int i, nr_pages;
103
104         if (!queue || !queue->queue_pages)
105                 return;
106
107         nr_pages = queue->queue_length / queue->pagesize;
108
109         for (i = 0; i < nr_pages; i += pages_per_kpage)
110                 free_page((unsigned long)(queue->queue_pages)[i]);
111
112         kfree(queue->queue_pages);
113 }
114
115 struct ehea_cq *ehea_create_cq(struct ehea_adapter *adapter,
116                                int nr_of_cqe, u64 eq_handle, u32 cq_token)
117 {
118         struct ehea_cq *cq;
119         struct h_epa epa;
120         u64 *cq_handle_ref, hret, rpage;
121         u32 act_nr_of_entries, act_pages, counter;
122         int ret;
123         void *vpage;
124
125         cq = kzalloc(sizeof(*cq), GFP_KERNEL);
126         if (!cq) {
127                 ehea_error("no mem for cq");
128                 goto out_nomem;
129         }
130
131         cq->attr.max_nr_of_cqes = nr_of_cqe;
132         cq->attr.cq_token = cq_token;
133         cq->attr.eq_handle = eq_handle;
134
135         cq->adapter = adapter;
136
137         cq_handle_ref = &cq->fw_handle;
138         act_nr_of_entries = 0;
139         act_pages = 0;
140
141         hret = ehea_h_alloc_resource_cq(adapter->handle, &cq->attr,
142                                         &cq->fw_handle, &cq->epas);
143         if (hret != H_SUCCESS) {
144                 ehea_error("alloc_resource_cq failed");
145                 goto out_freemem;
146         }
147
148         ret = hw_queue_ctor(&cq->hw_queue, cq->attr.nr_pages,
149                             EHEA_PAGESIZE, sizeof(struct ehea_cqe));
150         if (ret)
151                 goto out_freeres;
152
153         for (counter = 0; counter < cq->attr.nr_pages; counter++) {
154                 vpage = hw_qpageit_get_inc(&cq->hw_queue);
155                 if (!vpage) {
156                         ehea_error("hw_qpageit_get_inc failed");
157                         goto out_kill_hwq;
158                 }
159
160                 rpage = virt_to_abs(vpage);
161                 hret = ehea_h_register_rpage(adapter->handle,
162                                              0, EHEA_CQ_REGISTER_ORIG,
163                                              cq->fw_handle, rpage, 1);
164                 if (hret < H_SUCCESS) {
165                         ehea_error("register_rpage_cq failed ehea_cq=%p "
166                                    "hret=%lx counter=%i act_pages=%i",
167                                    cq, hret, counter, cq->attr.nr_pages);
168                         goto out_kill_hwq;
169                 }
170
171                 if (counter == (cq->attr.nr_pages - 1)) {
172                         vpage = hw_qpageit_get_inc(&cq->hw_queue);
173
174                         if ((hret != H_SUCCESS) || (vpage)) {
175                                 ehea_error("registration of pages not "
176                                            "complete hret=%lx\n", hret);
177                                 goto out_kill_hwq;
178                         }
179                 } else {
180                         if ((hret != H_PAGE_REGISTERED) || (!vpage)) {
181                                 ehea_error("CQ: registration of page failed "
182                                            "hret=%lx\n", hret);
183                                 goto out_kill_hwq;
184                         }
185                 }
186         }
187
188         hw_qeit_reset(&cq->hw_queue);
189         epa = cq->epas.kernel;
190         ehea_reset_cq_ep(cq);
191         ehea_reset_cq_n1(cq);
192
193         return cq;
194
195 out_kill_hwq:
196         hw_queue_dtor(&cq->hw_queue);
197
198 out_freeres:
199         ehea_h_free_resource(adapter->handle, cq->fw_handle);
200
201 out_freemem:
202         kfree(cq);
203
204 out_nomem:
205         return NULL;
206 }
207
208 int ehea_destroy_cq(struct ehea_cq *cq)
209 {
210         u64 adapter_handle, hret;
211
212         adapter_handle = cq->adapter->handle;
213
214         if (!cq)
215                 return 0;
216
217         /* deregister all previous registered pages */
218         hret = ehea_h_free_resource(adapter_handle, cq->fw_handle);
219         if (hret != H_SUCCESS) {
220                 ehea_error("destroy CQ failed");
221                 return -EIO;
222         }
223
224         hw_queue_dtor(&cq->hw_queue);
225         kfree(cq);
226
227         return 0;
228 }
229
230 struct ehea_eq *ehea_create_eq(struct ehea_adapter *adapter,
231                                const enum ehea_eq_type type,
232                                const u32 max_nr_of_eqes, const u8 eqe_gen)
233 {
234         int ret, i;
235         u64 hret, rpage;
236         void *vpage;
237         struct ehea_eq *eq;
238
239         eq = kzalloc(sizeof(*eq), GFP_KERNEL);
240         if (!eq) {
241                 ehea_error("no mem for eq");
242                 return NULL;
243         }
244
245         eq->adapter = adapter;
246         eq->attr.type = type;
247         eq->attr.max_nr_of_eqes = max_nr_of_eqes;
248         eq->attr.eqe_gen = eqe_gen;
249         spin_lock_init(&eq->spinlock);
250
251         hret = ehea_h_alloc_resource_eq(adapter->handle,
252                                         &eq->attr, &eq->fw_handle);
253         if (hret != H_SUCCESS) {
254                 ehea_error("alloc_resource_eq failed");
255                 goto out_freemem;
256         }
257
258         ret = hw_queue_ctor(&eq->hw_queue, eq->attr.nr_pages,
259                             EHEA_PAGESIZE, sizeof(struct ehea_eqe));
260         if (ret) {
261                 ehea_error("can't allocate eq pages");
262                 goto out_freeres;
263         }
264
265         for (i = 0; i < eq->attr.nr_pages; i++) {
266                 vpage = hw_qpageit_get_inc(&eq->hw_queue);
267                 if (!vpage) {
268                         ehea_error("hw_qpageit_get_inc failed");
269                         hret = H_RESOURCE;
270                         goto out_kill_hwq;
271                 }
272
273                 rpage = virt_to_abs(vpage);
274
275                 hret = ehea_h_register_rpage(adapter->handle, 0,
276                                              EHEA_EQ_REGISTER_ORIG,
277                                              eq->fw_handle, rpage, 1);
278
279                 if (i == (eq->attr.nr_pages - 1)) {
280                         /* last page */
281                         vpage = hw_qpageit_get_inc(&eq->hw_queue);
282                         if ((hret != H_SUCCESS) || (vpage)) {
283                                 goto out_kill_hwq;
284                         }
285                 } else {
286                         if ((hret != H_PAGE_REGISTERED) || (!vpage)) {
287                                 goto out_kill_hwq;
288                         }
289                 }
290         }
291
292         hw_qeit_reset(&eq->hw_queue);
293         return eq;
294
295 out_kill_hwq:
296         hw_queue_dtor(&eq->hw_queue);
297
298 out_freeres:
299         ehea_h_free_resource(adapter->handle, eq->fw_handle);
300
301 out_freemem:
302         kfree(eq);
303         return NULL;
304 }
305
306 struct ehea_eqe *ehea_poll_eq(struct ehea_eq *eq)
307 {
308         struct ehea_eqe *eqe;
309         unsigned long flags;
310
311         spin_lock_irqsave(&eq->spinlock, flags);
312         eqe = (struct ehea_eqe*)hw_eqit_eq_get_inc_valid(&eq->hw_queue);
313         spin_unlock_irqrestore(&eq->spinlock, flags);
314
315         return eqe;
316 }
317
318 int ehea_destroy_eq(struct ehea_eq *eq)
319 {
320         u64 hret;
321         unsigned long flags;
322
323         if (!eq)
324                 return 0;
325
326         spin_lock_irqsave(&eq->spinlock, flags);
327
328         hret = ehea_h_free_resource(eq->adapter->handle, eq->fw_handle);
329         spin_unlock_irqrestore(&eq->spinlock, flags);
330
331         if (hret != H_SUCCESS) {
332                 ehea_error("destroy_eq failed");
333                 return -EIO;
334         }
335
336         hw_queue_dtor(&eq->hw_queue);
337         kfree(eq);
338
339         return 0;
340 }
341
342 /**
343  * allocates memory for a queue and registers pages in phyp
344  */
345 int ehea_qp_alloc_register(struct ehea_qp *qp, struct hw_queue *hw_queue,
346                            int nr_pages, int wqe_size, int act_nr_sges,
347                            struct ehea_adapter *adapter, int h_call_q_selector)
348 {
349         u64 hret, rpage;
350         int ret, cnt;
351         void *vpage;
352
353         ret = hw_queue_ctor(hw_queue, nr_pages, EHEA_PAGESIZE, wqe_size);
354         if (ret)
355                 return ret;
356
357         for (cnt = 0; cnt < nr_pages; cnt++) {
358                 vpage = hw_qpageit_get_inc(hw_queue);
359                 if (!vpage) {
360                         ehea_error("hw_qpageit_get_inc failed");
361                         goto out_kill_hwq;
362                 }
363                 rpage = virt_to_abs(vpage);
364                 hret = ehea_h_register_rpage(adapter->handle,
365                                              0, h_call_q_selector,
366                                              qp->fw_handle, rpage, 1);
367                 if (hret < H_SUCCESS) {
368                         ehea_error("register_rpage_qp failed");
369                         goto out_kill_hwq;
370                 }
371         }
372         hw_qeit_reset(hw_queue);
373         return 0;
374
375 out_kill_hwq:
376         hw_queue_dtor(hw_queue);
377         return -EIO;
378 }
379
380 static inline u32 map_wqe_size(u8 wqe_enc_size)
381 {
382         return 128 << wqe_enc_size;
383 }
384
385 struct ehea_qp *ehea_create_qp(struct ehea_adapter *adapter,
386                                u32 pd, struct ehea_qp_init_attr *init_attr)
387 {
388         int ret;
389         u64 hret;
390         struct ehea_qp *qp;
391         u32 wqe_size_in_bytes_sq, wqe_size_in_bytes_rq1;
392         u32 wqe_size_in_bytes_rq2, wqe_size_in_bytes_rq3;
393
394
395         qp = kzalloc(sizeof(*qp), GFP_KERNEL);
396         if (!qp) {
397                 ehea_error("no mem for qp");
398                 return NULL;
399         }
400
401         qp->adapter = adapter;
402
403         hret = ehea_h_alloc_resource_qp(adapter->handle, init_attr, pd,
404                                         &qp->fw_handle, &qp->epas);
405         if (hret != H_SUCCESS) {
406                 ehea_error("ehea_h_alloc_resource_qp failed");
407                 goto out_freemem;
408         }
409
410         wqe_size_in_bytes_sq = map_wqe_size(init_attr->act_wqe_size_enc_sq);
411         wqe_size_in_bytes_rq1 = map_wqe_size(init_attr->act_wqe_size_enc_rq1);
412         wqe_size_in_bytes_rq2 = map_wqe_size(init_attr->act_wqe_size_enc_rq2);
413         wqe_size_in_bytes_rq3 = map_wqe_size(init_attr->act_wqe_size_enc_rq3);
414
415         ret = ehea_qp_alloc_register(qp, &qp->hw_squeue, init_attr->nr_sq_pages,
416                                      wqe_size_in_bytes_sq,
417                                      init_attr->act_wqe_size_enc_sq, adapter,
418                                      0);
419         if (ret) {
420                 ehea_error("can't register for sq ret=%x", ret);
421                 goto out_freeres;
422         }
423
424         ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue1,
425                                      init_attr->nr_rq1_pages,
426                                      wqe_size_in_bytes_rq1,
427                                      init_attr->act_wqe_size_enc_rq1,
428                                      adapter, 1);
429         if (ret) {
430                 ehea_error("can't register for rq1 ret=%x", ret);
431                 goto out_kill_hwsq;
432         }
433
434         if (init_attr->rq_count > 1) {
435                 ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue2,
436                                              init_attr->nr_rq2_pages,
437                                              wqe_size_in_bytes_rq2,
438                                              init_attr->act_wqe_size_enc_rq2,
439                                              adapter, 2);
440                 if (ret) {
441                         ehea_error("can't register for rq2 ret=%x", ret);
442                         goto out_kill_hwr1q;
443                 }
444         }
445
446         if (init_attr->rq_count > 2) {
447                 ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue3,
448                                              init_attr->nr_rq3_pages,
449                                              wqe_size_in_bytes_rq3,
450                                              init_attr->act_wqe_size_enc_rq3,
451                                              adapter, 3);
452                 if (ret) {
453                         ehea_error("can't register for rq3 ret=%x", ret);
454                         goto out_kill_hwr2q;
455                 }
456         }
457
458         qp->init_attr = *init_attr;
459
460         return qp;
461
462 out_kill_hwr2q:
463         hw_queue_dtor(&qp->hw_rqueue2);
464
465 out_kill_hwr1q:
466         hw_queue_dtor(&qp->hw_rqueue1);
467
468 out_kill_hwsq:
469         hw_queue_dtor(&qp->hw_squeue);
470
471 out_freeres:
472         ehea_h_disable_and_get_hea(adapter->handle, qp->fw_handle);
473         ehea_h_free_resource(adapter->handle, qp->fw_handle);
474
475 out_freemem:
476         kfree(qp);
477         return NULL;
478 }
479
480 int ehea_destroy_qp(struct ehea_qp *qp)
481 {
482         u64 hret;
483         struct ehea_qp_init_attr *qp_attr = &qp->init_attr;
484
485         if (!qp)
486                 return 0;
487
488         hret = ehea_h_free_resource(qp->adapter->handle, qp->fw_handle);
489         if (hret != H_SUCCESS) {
490                 ehea_error("destroy_qp failed");
491                 return -EIO;
492         }
493
494         hw_queue_dtor(&qp->hw_squeue);
495         hw_queue_dtor(&qp->hw_rqueue1);
496
497         if (qp_attr->rq_count > 1)
498                 hw_queue_dtor(&qp->hw_rqueue2);
499         if (qp_attr->rq_count > 2)
500                 hw_queue_dtor(&qp->hw_rqueue3);
501         kfree(qp);
502
503         return 0;
504 }
505
506 int ehea_reg_mr_adapter(struct ehea_adapter *adapter)
507 {
508         int i, k, ret;
509         u64 hret, pt_abs, start, end, nr_pages;
510         u32 acc_ctrl = EHEA_MR_ACC_CTRL;
511         u64 *pt;
512
513         start = KERNELBASE;
514         end = (u64)high_memory;
515         nr_pages = (end - start) / PAGE_SIZE;
516
517         pt =  kzalloc(PAGE_SIZE, GFP_KERNEL);
518         if (!pt) {
519                 ehea_error("no mem");
520                 ret = -ENOMEM;
521                 goto out;
522         }
523         pt_abs = virt_to_abs(pt);
524
525         hret = ehea_h_alloc_resource_mr(adapter->handle, start, end - start,
526                                         acc_ctrl, adapter->pd,
527                                         &adapter->mr.handle, &adapter->mr.lkey);
528         if (hret != H_SUCCESS) {
529                 ehea_error("alloc_resource_mr failed");
530                 ret = -EIO;
531                 goto out;
532         }
533
534         adapter->mr.vaddr = KERNELBASE;
535         k = 0;
536
537         while (nr_pages > 0) {
538                 if (nr_pages > 1) {
539                         u64 num_pages = min(nr_pages, (u64)512);
540                         for (i = 0; i < num_pages; i++)
541                                 pt[i] = virt_to_abs((void*)(((u64)start)
542                                                              + ((k++) *
543                                                                 PAGE_SIZE)));
544
545                         hret = ehea_h_register_rpage_mr(adapter->handle,
546                                                         adapter->mr.handle, 0,
547                                                         0, (u64)pt_abs,
548                                                         num_pages);
549                         nr_pages -= num_pages;
550                 } else {
551                         u64 abs_adr = virt_to_abs((void*)(((u64)start)
552                                                            + (k * PAGE_SIZE)));
553                         hret = ehea_h_register_rpage_mr(adapter->handle,
554                                                         adapter->mr.handle, 0,
555                                                         0, abs_adr,1);
556                         nr_pages--;
557                 }
558
559                 if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED)) {
560                         ehea_h_free_resource(adapter->handle,
561                                                 adapter->mr.handle);
562                         ehea_error("register_rpage_mr failed: hret = %lX",
563                                    hret);
564                         ret = -EIO;
565                         goto out;
566                 }
567         }
568
569         if (hret != H_SUCCESS) {
570                 ehea_h_free_resource(adapter->handle, adapter->mr.handle);
571                 ehea_error("register_rpage failed for last page: hret = %lX",
572                            hret);
573                 ret = -EIO;
574                 goto out;
575         }
576         ret = 0;
577 out:
578         kfree(pt);
579         return ret;
580 }
581
582