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46#include <linux/slab.h>
47
48#include "ehca_iverbs.h"
49#include "ehca_classes.h"
50#include "ehca_irq.h"
51#include "hcp_if.h"
52
53static struct kmem_cache *cq_cache;
54
55int ehca_cq_assign_qp(struct ehca_cq *cq, struct ehca_qp *qp)
56{
57 unsigned int qp_num = qp->real_qp_num;
58 unsigned int key = qp_num & (QP_HASHTAB_LEN-1);
59 unsigned long flags;
60
61 spin_lock_irqsave(&cq->spinlock, flags);
62 hlist_add_head(&qp->list_entries, &cq->qp_hashtab[key]);
63 spin_unlock_irqrestore(&cq->spinlock, flags);
64
65 ehca_dbg(cq->ib_cq.device, "cq_num=%x real_qp_num=%x",
66 cq->cq_number, qp_num);
67
68 return 0;
69}
70
71int ehca_cq_unassign_qp(struct ehca_cq *cq, unsigned int real_qp_num)
72{
73 int ret = -EINVAL;
74 unsigned int key = real_qp_num & (QP_HASHTAB_LEN-1);
75 struct hlist_node *iter;
76 struct ehca_qp *qp;
77 unsigned long flags;
78
79 spin_lock_irqsave(&cq->spinlock, flags);
80 hlist_for_each(iter, &cq->qp_hashtab[key]) {
81 qp = hlist_entry(iter, struct ehca_qp, list_entries);
82 if (qp->real_qp_num == real_qp_num) {
83 hlist_del(iter);
84 ehca_dbg(cq->ib_cq.device,
85 "removed qp from cq .cq_num=%x real_qp_num=%x",
86 cq->cq_number, real_qp_num);
87 ret = 0;
88 break;
89 }
90 }
91 spin_unlock_irqrestore(&cq->spinlock, flags);
92 if (ret)
93 ehca_err(cq->ib_cq.device,
94 "qp not found cq_num=%x real_qp_num=%x",
95 cq->cq_number, real_qp_num);
96
97 return ret;
98}
99
100struct ehca_qp *ehca_cq_get_qp(struct ehca_cq *cq, int real_qp_num)
101{
102 struct ehca_qp *ret = NULL;
103 unsigned int key = real_qp_num & (QP_HASHTAB_LEN-1);
104 struct hlist_node *iter;
105 struct ehca_qp *qp;
106 hlist_for_each(iter, &cq->qp_hashtab[key]) {
107 qp = hlist_entry(iter, struct ehca_qp, list_entries);
108 if (qp->real_qp_num == real_qp_num) {
109 ret = qp;
110 break;
111 }
112 }
113 return ret;
114}
115
116struct ib_cq *ehca_create_cq(struct ib_device *device, int cqe, int comp_vector,
117 struct ib_ucontext *context,
118 struct ib_udata *udata)
119{
120 static const u32 additional_cqe = 20;
121 struct ib_cq *cq;
122 struct ehca_cq *my_cq;
123 struct ehca_shca *shca =
124 container_of(device, struct ehca_shca, ib_device);
125 struct ipz_adapter_handle adapter_handle;
126 struct ehca_alloc_cq_parms param;
127 struct h_galpa gal;
128 void *vpage;
129 u32 counter;
130 u64 rpage, cqx_fec, h_ret;
131 int ipz_rc, i;
132 unsigned long flags;
133
134 if (cqe >= 0xFFFFFFFF - 64 - additional_cqe)
135 return ERR_PTR(-EINVAL);
136
137 if (!atomic_add_unless(&shca->num_cqs, 1, shca->max_num_cqs)) {
138 ehca_err(device, "Unable to create CQ, max number of %i "
139 "CQs reached.", shca->max_num_cqs);
140 ehca_err(device, "To increase the maximum number of CQs "
141 "use the number_of_cqs module parameter.\n");
142 return ERR_PTR(-ENOSPC);
143 }
144
145 my_cq = kmem_cache_zalloc(cq_cache, GFP_KERNEL);
146 if (!my_cq) {
147 ehca_err(device, "Out of memory for ehca_cq struct device=%p",
148 device);
149 atomic_dec(&shca->num_cqs);
150 return ERR_PTR(-ENOMEM);
151 }
152
153 memset(¶m, 0, sizeof(struct ehca_alloc_cq_parms));
154
155 spin_lock_init(&my_cq->spinlock);
156 spin_lock_init(&my_cq->cb_lock);
157 spin_lock_init(&my_cq->task_lock);
158 atomic_set(&my_cq->nr_events, 0);
159 init_waitqueue_head(&my_cq->wait_completion);
160
161 cq = &my_cq->ib_cq;
162
163 adapter_handle = shca->ipz_hca_handle;
164 param.eq_handle = shca->eq.ipz_eq_handle;
165
166 idr_preload(GFP_KERNEL);
167 write_lock_irqsave(&ehca_cq_idr_lock, flags);
168 my_cq->token = idr_alloc(&ehca_cq_idr, my_cq, 0, 0x2000000, GFP_NOWAIT);
169 write_unlock_irqrestore(&ehca_cq_idr_lock, flags);
170 idr_preload_end();
171
172 if (my_cq->token < 0) {
173 cq = ERR_PTR(-ENOMEM);
174 ehca_err(device, "Can't allocate new idr entry. device=%p",
175 device);
176 goto create_cq_exit1;
177 }
178
179
180
181
182
183 param.nr_cqe = cqe + additional_cqe;
184 h_ret = hipz_h_alloc_resource_cq(adapter_handle, my_cq, ¶m);
185
186 if (h_ret != H_SUCCESS) {
187 ehca_err(device, "hipz_h_alloc_resource_cq() failed "
188 "h_ret=%lli device=%p", h_ret, device);
189 cq = ERR_PTR(ehca2ib_return_code(h_ret));
190 goto create_cq_exit2;
191 }
192
193 ipz_rc = ipz_queue_ctor(NULL, &my_cq->ipz_queue, param.act_pages,
194 EHCA_PAGESIZE, sizeof(struct ehca_cqe), 0, 0);
195 if (!ipz_rc) {
196 ehca_err(device, "ipz_queue_ctor() failed ipz_rc=%i device=%p",
197 ipz_rc, device);
198 cq = ERR_PTR(-EINVAL);
199 goto create_cq_exit3;
200 }
201
202 for (counter = 0; counter < param.act_pages; counter++) {
203 vpage = ipz_qpageit_get_inc(&my_cq->ipz_queue);
204 if (!vpage) {
205 ehca_err(device, "ipz_qpageit_get_inc() "
206 "returns NULL device=%p", device);
207 cq = ERR_PTR(-EAGAIN);
208 goto create_cq_exit4;
209 }
210 rpage = __pa(vpage);
211
212 h_ret = hipz_h_register_rpage_cq(adapter_handle,
213 my_cq->ipz_cq_handle,
214 &my_cq->pf,
215 0,
216 0,
217 rpage,
218 1,
219 my_cq->galpas.
220 kernel);
221
222 if (h_ret < H_SUCCESS) {
223 ehca_err(device, "hipz_h_register_rpage_cq() failed "
224 "ehca_cq=%p cq_num=%x h_ret=%lli counter=%i "
225 "act_pages=%i", my_cq, my_cq->cq_number,
226 h_ret, counter, param.act_pages);
227 cq = ERR_PTR(-EINVAL);
228 goto create_cq_exit4;
229 }
230
231 if (counter == (param.act_pages - 1)) {
232 vpage = ipz_qpageit_get_inc(&my_cq->ipz_queue);
233 if ((h_ret != H_SUCCESS) || vpage) {
234 ehca_err(device, "Registration of pages not "
235 "complete ehca_cq=%p cq_num=%x "
236 "h_ret=%lli", my_cq, my_cq->cq_number,
237 h_ret);
238 cq = ERR_PTR(-EAGAIN);
239 goto create_cq_exit4;
240 }
241 } else {
242 if (h_ret != H_PAGE_REGISTERED) {
243 ehca_err(device, "Registration of page failed "
244 "ehca_cq=%p cq_num=%x h_ret=%lli "
245 "counter=%i act_pages=%i",
246 my_cq, my_cq->cq_number,
247 h_ret, counter, param.act_pages);
248 cq = ERR_PTR(-ENOMEM);
249 goto create_cq_exit4;
250 }
251 }
252 }
253
254 ipz_qeit_reset(&my_cq->ipz_queue);
255
256 gal = my_cq->galpas.kernel;
257 cqx_fec = hipz_galpa_load(gal, CQTEMM_OFFSET(cqx_fec));
258 ehca_dbg(device, "ehca_cq=%p cq_num=%x CQX_FEC=%llx",
259 my_cq, my_cq->cq_number, cqx_fec);
260
261 my_cq->ib_cq.cqe = my_cq->nr_of_entries =
262 param.act_nr_of_entries - additional_cqe;
263 my_cq->cq_number = (my_cq->ipz_cq_handle.handle) & 0xffff;
264
265 for (i = 0; i < QP_HASHTAB_LEN; i++)
266 INIT_HLIST_HEAD(&my_cq->qp_hashtab[i]);
267
268 INIT_LIST_HEAD(&my_cq->sqp_err_list);
269 INIT_LIST_HEAD(&my_cq->rqp_err_list);
270
271 if (context) {
272 struct ipz_queue *ipz_queue = &my_cq->ipz_queue;
273 struct ehca_create_cq_resp resp;
274 memset(&resp, 0, sizeof(resp));
275 resp.cq_number = my_cq->cq_number;
276 resp.token = my_cq->token;
277 resp.ipz_queue.qe_size = ipz_queue->qe_size;
278 resp.ipz_queue.act_nr_of_sg = ipz_queue->act_nr_of_sg;
279 resp.ipz_queue.queue_length = ipz_queue->queue_length;
280 resp.ipz_queue.pagesize = ipz_queue->pagesize;
281 resp.ipz_queue.toggle_state = ipz_queue->toggle_state;
282 resp.fw_handle_ofs = (u32)
283 (my_cq->galpas.user.fw_handle & (PAGE_SIZE - 1));
284 if (ib_copy_to_udata(udata, &resp, sizeof(resp))) {
285 ehca_err(device, "Copy to udata failed.");
286 goto create_cq_exit4;
287 }
288 }
289
290 return cq;
291
292create_cq_exit4:
293 ipz_queue_dtor(NULL, &my_cq->ipz_queue);
294
295create_cq_exit3:
296 h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 1);
297 if (h_ret != H_SUCCESS)
298 ehca_err(device, "hipz_h_destroy_cq() failed ehca_cq=%p "
299 "cq_num=%x h_ret=%lli", my_cq, my_cq->cq_number, h_ret);
300
301create_cq_exit2:
302 write_lock_irqsave(&ehca_cq_idr_lock, flags);
303 idr_remove(&ehca_cq_idr, my_cq->token);
304 write_unlock_irqrestore(&ehca_cq_idr_lock, flags);
305
306create_cq_exit1:
307 kmem_cache_free(cq_cache, my_cq);
308
309 atomic_dec(&shca->num_cqs);
310 return cq;
311}
312
313int ehca_destroy_cq(struct ib_cq *cq)
314{
315 u64 h_ret;
316 struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
317 int cq_num = my_cq->cq_number;
318 struct ib_device *device = cq->device;
319 struct ehca_shca *shca = container_of(device, struct ehca_shca,
320 ib_device);
321 struct ipz_adapter_handle adapter_handle = shca->ipz_hca_handle;
322 unsigned long flags;
323
324 if (cq->uobject) {
325 if (my_cq->mm_count_galpa || my_cq->mm_count_queue) {
326 ehca_err(device, "Resources still referenced in "
327 "user space cq_num=%x", my_cq->cq_number);
328 return -EINVAL;
329 }
330 }
331
332
333
334
335
336 write_lock_irqsave(&ehca_cq_idr_lock, flags);
337 idr_remove(&ehca_cq_idr, my_cq->token);
338 write_unlock_irqrestore(&ehca_cq_idr_lock, flags);
339
340
341 wait_event(my_cq->wait_completion, !atomic_read(&my_cq->nr_events));
342
343
344 h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 0);
345 if (h_ret == H_R_STATE) {
346
347 ehca_dbg(device, "ehca_cq=%p cq_num=%x resource=%llx in err "
348 "state. Try to delete it forcibly.",
349 my_cq, cq_num, my_cq->ipz_cq_handle.handle);
350 ehca_error_data(shca, my_cq, my_cq->ipz_cq_handle.handle);
351 h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 1);
352 if (h_ret == H_SUCCESS)
353 ehca_dbg(device, "cq_num=%x deleted successfully.",
354 cq_num);
355 }
356 if (h_ret != H_SUCCESS) {
357 ehca_err(device, "hipz_h_destroy_cq() failed h_ret=%lli "
358 "ehca_cq=%p cq_num=%x", h_ret, my_cq, cq_num);
359 return ehca2ib_return_code(h_ret);
360 }
361 ipz_queue_dtor(NULL, &my_cq->ipz_queue);
362 kmem_cache_free(cq_cache, my_cq);
363
364 atomic_dec(&shca->num_cqs);
365 return 0;
366}
367
368int ehca_resize_cq(struct ib_cq *cq, int cqe, struct ib_udata *udata)
369{
370
371 ehca_err(cq->device, "not implemented yet");
372
373 return -EFAULT;
374}
375
376int ehca_init_cq_cache(void)
377{
378 cq_cache = kmem_cache_create("ehca_cache_cq",
379 sizeof(struct ehca_cq), 0,
380 SLAB_HWCACHE_ALIGN,
381 NULL);
382 if (!cq_cache)
383 return -ENOMEM;
384 return 0;
385}
386
387void ehca_cleanup_cq_cache(void)
388{
389 if (cq_cache)
390 kmem_cache_destroy(cq_cache);
391}
392