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Heiko J Schickfab97222006-09-22 15:22:22 -07001/*
2 * IBM eServer eHCA Infiniband device driver for Linux on POWER
3 *
4 * Functions for EQs, NEQs and interrupts
5 *
6 * Authors: Heiko J Schick <schickhj@de.ibm.com>
7 * Khadija Souissi <souissi@de.ibm.com>
Joachim Fenkes28db6be2007-07-09 15:30:39 +02008 * Hoang-Nam Nguyen <hnguyen@de.ibm.com>
9 * Joachim Fenkes <fenkes@de.ibm.com>
Heiko J Schickfab97222006-09-22 15:22:22 -070010 *
11 * Copyright (c) 2005 IBM Corporation
12 *
13 * All rights reserved.
14 *
15 * This source code is distributed under a dual license of GPL v2.0 and OpenIB
16 * BSD.
17 *
18 * OpenIB BSD License
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions are met:
22 *
23 * Redistributions of source code must retain the above copyright notice, this
24 * list of conditions and the following disclaimer.
25 *
26 * Redistributions in binary form must reproduce the above copyright notice,
27 * this list of conditions and the following disclaimer in the documentation
28 * and/or other materials
29 * provided with the distribution.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
32 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
34 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
35 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
36 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
37 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
38 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
39 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGE.
42 */
43
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090044#include <linux/slab.h>
45
Heiko J Schickfab97222006-09-22 15:22:22 -070046#include "ehca_classes.h"
47#include "ehca_irq.h"
48#include "ehca_iverbs.h"
49#include "ehca_tools.h"
50#include "hcp_if.h"
51#include "hipz_fns.h"
Hoang-Nam Nguyen7e28db52006-11-07 00:56:39 +010052#include "ipz_pt_fn.h"
Heiko J Schickfab97222006-09-22 15:22:22 -070053
Hoang-Nam Nguyen2b943972007-07-12 17:53:47 +020054#define EQE_COMPLETION_EVENT EHCA_BMASK_IBM( 1, 1)
55#define EQE_CQ_QP_NUMBER EHCA_BMASK_IBM( 8, 31)
56#define EQE_EE_IDENTIFIER EHCA_BMASK_IBM( 2, 7)
57#define EQE_CQ_NUMBER EHCA_BMASK_IBM( 8, 31)
58#define EQE_QP_NUMBER EHCA_BMASK_IBM( 8, 31)
59#define EQE_QP_TOKEN EHCA_BMASK_IBM(32, 63)
60#define EQE_CQ_TOKEN EHCA_BMASK_IBM(32, 63)
Heiko J Schickfab97222006-09-22 15:22:22 -070061
Hoang-Nam Nguyen2b943972007-07-12 17:53:47 +020062#define NEQE_COMPLETION_EVENT EHCA_BMASK_IBM( 1, 1)
63#define NEQE_EVENT_CODE EHCA_BMASK_IBM( 2, 7)
64#define NEQE_PORT_NUMBER EHCA_BMASK_IBM( 8, 15)
65#define NEQE_PORT_AVAILABILITY EHCA_BMASK_IBM(16, 16)
66#define NEQE_DISRUPTIVE EHCA_BMASK_IBM(16, 16)
Hoang-Nam Nguyene57d62a2007-12-20 15:06:33 +010067#define NEQE_SPECIFIC_EVENT EHCA_BMASK_IBM(16, 23)
Heiko J Schickfab97222006-09-22 15:22:22 -070068
Hoang-Nam Nguyen2b943972007-07-12 17:53:47 +020069#define ERROR_DATA_LENGTH EHCA_BMASK_IBM(52, 63)
70#define ERROR_DATA_TYPE EHCA_BMASK_IBM( 0, 7)
Heiko J Schickfab97222006-09-22 15:22:22 -070071
Heiko J Schickfab97222006-09-22 15:22:22 -070072static void queue_comp_task(struct ehca_cq *__cq);
73
Hoang-Nam Nguyen2b943972007-07-12 17:53:47 +020074static struct ehca_comp_pool *pool;
Heiko J Schickfab97222006-09-22 15:22:22 -070075
Heiko J Schickfab97222006-09-22 15:22:22 -070076static inline void comp_event_callback(struct ehca_cq *cq)
77{
78 if (!cq->ib_cq.comp_handler)
79 return;
80
81 spin_lock(&cq->cb_lock);
82 cq->ib_cq.comp_handler(&cq->ib_cq, cq->ib_cq.cq_context);
83 spin_unlock(&cq->cb_lock);
84
85 return;
86}
87
Hoang-Nam Nguyen2b943972007-07-12 17:53:47 +020088static void print_error_data(struct ehca_shca *shca, void *data,
89 u64 *rblock, int length)
Heiko J Schickfab97222006-09-22 15:22:22 -070090{
91 u64 type = EHCA_BMASK_GET(ERROR_DATA_TYPE, rblock[2]);
92 u64 resource = rblock[1];
93
94 switch (type) {
95 case 0x1: /* Queue Pair */
96 {
Hoang-Nam Nguyen2b943972007-07-12 17:53:47 +020097 struct ehca_qp *qp = (struct ehca_qp *)data;
Heiko J Schickfab97222006-09-22 15:22:22 -070098
99 /* only print error data if AER is set */
100 if (rblock[6] == 0)
101 return;
102
103 ehca_err(&shca->ib_device,
Stephen Rothwell3750f602009-01-16 14:55:28 -0800104 "QP 0x%x (resource=%llx) has errors.",
Heiko J Schickfab97222006-09-22 15:22:22 -0700105 qp->ib_qp.qp_num, resource);
106 break;
107 }
108 case 0x4: /* Completion Queue */
109 {
Hoang-Nam Nguyen2b943972007-07-12 17:53:47 +0200110 struct ehca_cq *cq = (struct ehca_cq *)data;
Heiko J Schickfab97222006-09-22 15:22:22 -0700111
112 ehca_err(&shca->ib_device,
Stephen Rothwell3750f602009-01-16 14:55:28 -0800113 "CQ 0x%x (resource=%llx) has errors.",
Heiko J Schickfab97222006-09-22 15:22:22 -0700114 cq->cq_number, resource);
115 break;
116 }
117 default:
118 ehca_err(&shca->ib_device,
Stephen Rothwell3750f602009-01-16 14:55:28 -0800119 "Unknown error type: %llx on %s.",
Heiko J Schickfab97222006-09-22 15:22:22 -0700120 type, shca->ib_device.name);
121 break;
122 }
123
Stephen Rothwell3750f602009-01-16 14:55:28 -0800124 ehca_err(&shca->ib_device, "Error data is available: %llx.", resource);
Heiko J Schickfab97222006-09-22 15:22:22 -0700125 ehca_err(&shca->ib_device, "EHCA ----- error data begin "
126 "---------------------------------------------------");
Stephen Rothwell3750f602009-01-16 14:55:28 -0800127 ehca_dmp(rblock, length, "resource=%llx", resource);
Heiko J Schickfab97222006-09-22 15:22:22 -0700128 ehca_err(&shca->ib_device, "EHCA ----- error data end "
129 "----------------------------------------------------");
130
131 return;
132}
133
134int ehca_error_data(struct ehca_shca *shca, void *data,
135 u64 resource)
136{
137
138 unsigned long ret;
139 u64 *rblock;
140 unsigned long block_count;
141
Hoang-Nam Nguyenf2d91362007-01-09 18:04:14 +0100142 rblock = ehca_alloc_fw_ctrlblock(GFP_ATOMIC);
Heiko J Schickfab97222006-09-22 15:22:22 -0700143 if (!rblock) {
144 ehca_err(&shca->ib_device, "Cannot allocate rblock memory.");
145 ret = -ENOMEM;
146 goto error_data1;
147 }
148
Hoang-Nam Nguyen7e28db52006-11-07 00:56:39 +0100149 /* rblock must be 4K aligned and should be 4K large */
Heiko J Schickfab97222006-09-22 15:22:22 -0700150 ret = hipz_h_error_data(shca->ipz_hca_handle,
151 resource,
152 rblock,
153 &block_count);
154
Hoang-Nam Nguyen7e28db52006-11-07 00:56:39 +0100155 if (ret == H_R_STATE)
Heiko J Schickfab97222006-09-22 15:22:22 -0700156 ehca_err(&shca->ib_device,
Stephen Rothwell3750f602009-01-16 14:55:28 -0800157 "No error data is available: %llx.", resource);
Heiko J Schickfab97222006-09-22 15:22:22 -0700158 else if (ret == H_SUCCESS) {
159 int length;
160
161 length = EHCA_BMASK_GET(ERROR_DATA_LENGTH, rblock[0]);
162
Hoang-Nam Nguyen7e28db52006-11-07 00:56:39 +0100163 if (length > EHCA_PAGESIZE)
164 length = EHCA_PAGESIZE;
Heiko J Schickfab97222006-09-22 15:22:22 -0700165
166 print_error_data(shca, data, rblock, length);
Hoang-Nam Nguyen7e28db52006-11-07 00:56:39 +0100167 } else
Heiko J Schickfab97222006-09-22 15:22:22 -0700168 ehca_err(&shca->ib_device,
Stephen Rothwell3750f602009-01-16 14:55:28 -0800169 "Error data could not be fetched: %llx", resource);
Heiko J Schickfab97222006-09-22 15:22:22 -0700170
Hoang-Nam Nguyen7e28db52006-11-07 00:56:39 +0100171 ehca_free_fw_ctrlblock(rblock);
Heiko J Schickfab97222006-09-22 15:22:22 -0700172
173error_data1:
174 return ret;
175
176}
177
Joachim Fenkes5ff70cac2007-08-31 16:03:37 +0200178static void dispatch_qp_event(struct ehca_shca *shca, struct ehca_qp *qp,
179 enum ib_event_type event_type)
180{
181 struct ib_event event;
182
Joachim Fenkes5b673b72008-07-22 14:18:07 -0700183 /* PATH_MIG without the QP ever having been armed is false alarm */
184 if (event_type == IB_EVENT_PATH_MIG && !qp->mig_armed)
185 return;
186
Joachim Fenkes5ff70cac2007-08-31 16:03:37 +0200187 event.device = &shca->ib_device;
188 event.event = event_type;
189
190 if (qp->ext_type == EQPT_SRQ) {
191 if (!qp->ib_srq.event_handler)
192 return;
193
194 event.element.srq = &qp->ib_srq;
195 qp->ib_srq.event_handler(&event, qp->ib_srq.srq_context);
196 } else {
197 if (!qp->ib_qp.event_handler)
198 return;
199
200 event.element.qp = &qp->ib_qp;
201 qp->ib_qp.event_handler(&event, qp->ib_qp.qp_context);
202 }
203}
204
Hoang-Nam Nguyen633a5ae2007-07-20 16:02:18 +0200205static void qp_event_callback(struct ehca_shca *shca, u64 eqe,
206 enum ib_event_type event_type, int fatal)
Heiko J Schickfab97222006-09-22 15:22:22 -0700207{
Heiko J Schickfab97222006-09-22 15:22:22 -0700208 struct ehca_qp *qp;
Heiko J Schickfab97222006-09-22 15:22:22 -0700209 u32 token = EHCA_BMASK_GET(EQE_QP_TOKEN, eqe);
210
Joachim Fenkes26ed6872007-07-09 15:31:10 +0200211 read_lock(&ehca_qp_idr_lock);
Heiko J Schickfab97222006-09-22 15:22:22 -0700212 qp = idr_find(&ehca_qp_idr, token);
Stefan Roscher12137c52008-05-07 11:35:06 -0700213 if (qp)
214 atomic_inc(&qp->nr_events);
Joachim Fenkes26ed6872007-07-09 15:31:10 +0200215 read_unlock(&ehca_qp_idr_lock);
Heiko J Schickfab97222006-09-22 15:22:22 -0700216
Heiko J Schickfab97222006-09-22 15:22:22 -0700217 if (!qp)
218 return;
219
Hoang-Nam Nguyen633a5ae2007-07-20 16:02:18 +0200220 if (fatal)
221 ehca_error_data(shca, qp, qp->ipz_qp_handle.handle);
Heiko J Schickfab97222006-09-22 15:22:22 -0700222
Joachim Fenkes5ff70cac2007-08-31 16:03:37 +0200223 dispatch_qp_event(shca, qp, fatal && qp->ext_type == EQPT_SRQ ?
224 IB_EVENT_SRQ_ERR : event_type);
Heiko J Schickfab97222006-09-22 15:22:22 -0700225
Joachim Fenkes5ff70cac2007-08-31 16:03:37 +0200226 /*
227 * eHCA only processes one WQE at a time for SRQ base QPs,
228 * so the last WQE has been processed as soon as the QP enters
229 * error state.
230 */
231 if (fatal && qp->ext_type == EQPT_SRQBASE)
232 dispatch_qp_event(shca, qp, IB_EVENT_QP_LAST_WQE_REACHED);
Heiko J Schickfab97222006-09-22 15:22:22 -0700233
Stefan Roscher12137c52008-05-07 11:35:06 -0700234 if (atomic_dec_and_test(&qp->nr_events))
235 wake_up(&qp->wait_completion);
Heiko J Schickfab97222006-09-22 15:22:22 -0700236 return;
237}
238
239static void cq_event_callback(struct ehca_shca *shca,
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100240 u64 eqe)
Heiko J Schickfab97222006-09-22 15:22:22 -0700241{
242 struct ehca_cq *cq;
Heiko J Schickfab97222006-09-22 15:22:22 -0700243 u32 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe);
244
Joachim Fenkes26ed6872007-07-09 15:31:10 +0200245 read_lock(&ehca_cq_idr_lock);
Heiko J Schickfab97222006-09-22 15:22:22 -0700246 cq = idr_find(&ehca_cq_idr, token);
Joachim Fenkes28db6be2007-07-09 15:30:39 +0200247 if (cq)
248 atomic_inc(&cq->nr_events);
Joachim Fenkes26ed6872007-07-09 15:31:10 +0200249 read_unlock(&ehca_cq_idr_lock);
Heiko J Schickfab97222006-09-22 15:22:22 -0700250
251 if (!cq)
252 return;
253
254 ehca_error_data(shca, cq, cq->ipz_cq_handle.handle);
255
Joachim Fenkes28db6be2007-07-09 15:30:39 +0200256 if (atomic_dec_and_test(&cq->nr_events))
257 wake_up(&cq->wait_completion);
258
Heiko J Schickfab97222006-09-22 15:22:22 -0700259 return;
260}
261
262static void parse_identifier(struct ehca_shca *shca, u64 eqe)
263{
264 u8 identifier = EHCA_BMASK_GET(EQE_EE_IDENTIFIER, eqe);
265
266 switch (identifier) {
267 case 0x02: /* path migrated */
Hoang-Nam Nguyen633a5ae2007-07-20 16:02:18 +0200268 qp_event_callback(shca, eqe, IB_EVENT_PATH_MIG, 0);
Heiko J Schickfab97222006-09-22 15:22:22 -0700269 break;
270 case 0x03: /* communication established */
Hoang-Nam Nguyen633a5ae2007-07-20 16:02:18 +0200271 qp_event_callback(shca, eqe, IB_EVENT_COMM_EST, 0);
Heiko J Schickfab97222006-09-22 15:22:22 -0700272 break;
273 case 0x04: /* send queue drained */
Hoang-Nam Nguyen633a5ae2007-07-20 16:02:18 +0200274 qp_event_callback(shca, eqe, IB_EVENT_SQ_DRAINED, 0);
Heiko J Schickfab97222006-09-22 15:22:22 -0700275 break;
276 case 0x05: /* QP error */
277 case 0x06: /* QP error */
Hoang-Nam Nguyen633a5ae2007-07-20 16:02:18 +0200278 qp_event_callback(shca, eqe, IB_EVENT_QP_FATAL, 1);
Heiko J Schickfab97222006-09-22 15:22:22 -0700279 break;
280 case 0x07: /* CQ error */
281 case 0x08: /* CQ error */
282 cq_event_callback(shca, eqe);
283 break;
284 case 0x09: /* MRMWPTE error */
285 ehca_err(&shca->ib_device, "MRMWPTE error.");
286 break;
287 case 0x0A: /* port event */
288 ehca_err(&shca->ib_device, "Port event.");
289 break;
290 case 0x0B: /* MR access error */
291 ehca_err(&shca->ib_device, "MR access error.");
292 break;
293 case 0x0C: /* EQ error */
294 ehca_err(&shca->ib_device, "EQ error.");
295 break;
296 case 0x0D: /* P/Q_Key mismatch */
297 ehca_err(&shca->ib_device, "P/Q_Key mismatch.");
298 break;
299 case 0x10: /* sampling complete */
300 ehca_err(&shca->ib_device, "Sampling complete.");
301 break;
302 case 0x11: /* unaffiliated access error */
303 ehca_err(&shca->ib_device, "Unaffiliated access error.");
304 break;
Joachim Fenkese90d0b32007-09-11 15:34:04 +0200305 case 0x12: /* path migrating */
306 ehca_err(&shca->ib_device, "Path migrating.");
Heiko J Schickfab97222006-09-22 15:22:22 -0700307 break;
308 case 0x13: /* interface trace stopped */
309 ehca_err(&shca->ib_device, "Interface trace stopped.");
310 break;
311 case 0x14: /* first error capture info available */
Hoang-Nam Nguyen633a5ae2007-07-20 16:02:18 +0200312 ehca_info(&shca->ib_device, "First error capture available");
313 break;
314 case 0x15: /* SRQ limit reached */
315 qp_event_callback(shca, eqe, IB_EVENT_SRQ_LIMIT_REACHED, 0);
316 break;
Heiko J Schickfab97222006-09-22 15:22:22 -0700317 default:
318 ehca_err(&shca->ib_device, "Unknown identifier: %x on %s.",
319 identifier, shca->ib_device.name);
320 break;
321 }
322
323 return;
324}
325
Joachim Fenkes8705ce52007-07-09 15:32:22 +0200326static void dispatch_port_event(struct ehca_shca *shca, int port_num,
327 enum ib_event_type type, const char *msg)
Heiko J Schickfab97222006-09-22 15:22:22 -0700328{
329 struct ib_event event;
Joachim Fenkes8705ce52007-07-09 15:32:22 +0200330
331 ehca_info(&shca->ib_device, "port %d %s.", port_num, msg);
332 event.device = &shca->ib_device;
333 event.event = type;
334 event.element.port_num = port_num;
335 ib_dispatch_event(&event);
336}
337
338static void notify_port_conf_change(struct ehca_shca *shca, int port_num)
339{
340 struct ehca_sma_attr new_attr;
341 struct ehca_sma_attr *old_attr = &shca->sport[port_num - 1].saved_attr;
342
343 ehca_query_sma_attr(shca, port_num, &new_attr);
344
345 if (new_attr.sm_sl != old_attr->sm_sl ||
346 new_attr.sm_lid != old_attr->sm_lid)
347 dispatch_port_event(shca, port_num, IB_EVENT_SM_CHANGE,
348 "SM changed");
349
350 if (new_attr.lid != old_attr->lid ||
351 new_attr.lmc != old_attr->lmc)
352 dispatch_port_event(shca, port_num, IB_EVENT_LID_CHANGE,
353 "LID changed");
354
355 if (new_attr.pkey_tbl_len != old_attr->pkey_tbl_len ||
356 memcmp(new_attr.pkeys, old_attr->pkeys,
357 sizeof(u16) * new_attr.pkey_tbl_len))
358 dispatch_port_event(shca, port_num, IB_EVENT_PKEY_CHANGE,
359 "P_Key changed");
360
361 *old_attr = new_attr;
362}
363
Stefan Roscherfad96ab2008-11-11 15:44:22 -0800364/* replay modify_qp for sqps -- return 0 if all is well, 1 if AQP1 destroyed */
365static int replay_modify_qp(struct ehca_sport *sport)
366{
367 int aqp1_destroyed;
368 unsigned long flags;
369
370 spin_lock_irqsave(&sport->mod_sqp_lock, flags);
371
372 aqp1_destroyed = !sport->ibqp_sqp[IB_QPT_GSI];
373
374 if (sport->ibqp_sqp[IB_QPT_SMI])
375 ehca_recover_sqp(sport->ibqp_sqp[IB_QPT_SMI]);
376 if (!aqp1_destroyed)
377 ehca_recover_sqp(sport->ibqp_sqp[IB_QPT_GSI]);
378
379 spin_unlock_irqrestore(&sport->mod_sqp_lock, flags);
380
381 return aqp1_destroyed;
382}
383
Joachim Fenkes8705ce52007-07-09 15:32:22 +0200384static void parse_ec(struct ehca_shca *shca, u64 eqe)
385{
Heiko J Schickfab97222006-09-22 15:22:22 -0700386 u8 ec = EHCA_BMASK_GET(NEQE_EVENT_CODE, eqe);
387 u8 port = EHCA_BMASK_GET(NEQE_PORT_NUMBER, eqe);
Hoang-Nam Nguyene57d62a2007-12-20 15:06:33 +0100388 u8 spec_event;
Hoang-Nam Nguyenbbdd2672008-01-17 15:05:45 +0100389 struct ehca_sport *sport = &shca->sport[port - 1];
Heiko J Schickfab97222006-09-22 15:22:22 -0700390
391 switch (ec) {
392 case 0x30: /* port availability change */
393 if (EHCA_BMASK_GET(NEQE_PORT_AVAILABILITY, eqe)) {
Stefan Roscherfad96ab2008-11-11 15:44:22 -0800394 /* only replay modify_qp calls in autodetect mode;
395 * if AQP1 was destroyed, the port is already down
396 * again and we can drop the event.
397 */
398 if (ehca_nr_ports < 0)
399 if (replay_modify_qp(sport))
400 break;
Hoang-Nam Nguyenbbdd2672008-01-17 15:05:45 +0100401
402 sport->port_state = IB_PORT_ACTIVE;
Joachim Fenkes8705ce52007-07-09 15:32:22 +0200403 dispatch_port_event(shca, port, IB_EVENT_PORT_ACTIVE,
404 "is active");
Stefan Roscherfad96ab2008-11-11 15:44:22 -0800405 ehca_query_sma_attr(shca, port, &sport->saved_attr);
Heiko J Schickfab97222006-09-22 15:22:22 -0700406 } else {
Hoang-Nam Nguyenbbdd2672008-01-17 15:05:45 +0100407 sport->port_state = IB_PORT_DOWN;
Joachim Fenkes8705ce52007-07-09 15:32:22 +0200408 dispatch_port_event(shca, port, IB_EVENT_PORT_ERR,
409 "is inactive");
Heiko J Schickfab97222006-09-22 15:22:22 -0700410 }
411 break;
412 case 0x31:
413 /* port configuration change
414 * disruptive change is caused by
415 * LID, PKEY or SM change
416 */
Joachim Fenkes8705ce52007-07-09 15:32:22 +0200417 if (EHCA_BMASK_GET(NEQE_DISRUPTIVE, eqe)) {
418 ehca_warn(&shca->ib_device, "disruptive port "
419 "%d configuration change", port);
Heiko J Schickfab97222006-09-22 15:22:22 -0700420
Hoang-Nam Nguyenbbdd2672008-01-17 15:05:45 +0100421 sport->port_state = IB_PORT_DOWN;
Joachim Fenkes8705ce52007-07-09 15:32:22 +0200422 dispatch_port_event(shca, port, IB_EVENT_PORT_ERR,
423 "is inactive");
Heiko J Schickfab97222006-09-22 15:22:22 -0700424
Hoang-Nam Nguyenbbdd2672008-01-17 15:05:45 +0100425 sport->port_state = IB_PORT_ACTIVE;
Joachim Fenkes8705ce52007-07-09 15:32:22 +0200426 dispatch_port_event(shca, port, IB_EVENT_PORT_ACTIVE,
427 "is active");
Joachim Fenkes528b03f72008-01-25 21:12:39 +0100428 ehca_query_sma_attr(shca, port,
429 &sport->saved_attr);
Joachim Fenkes8705ce52007-07-09 15:32:22 +0200430 } else
431 notify_port_conf_change(shca, port);
Heiko J Schickfab97222006-09-22 15:22:22 -0700432 break;
433 case 0x32: /* adapter malfunction */
434 ehca_err(&shca->ib_device, "Adapter malfunction.");
435 break;
436 case 0x33: /* trace stopped */
437 ehca_err(&shca->ib_device, "Traced stopped.");
438 break;
Hoang-Nam Nguyene57d62a2007-12-20 15:06:33 +0100439 case 0x34: /* util async event */
440 spec_event = EHCA_BMASK_GET(NEQE_SPECIFIC_EVENT, eqe);
441 if (spec_event == 0x80) /* client reregister required */
442 dispatch_port_event(shca, port,
443 IB_EVENT_CLIENT_REREGISTER,
444 "client reregister req.");
445 else
446 ehca_warn(&shca->ib_device, "Unknown util async "
447 "event %x on port %x", spec_event, port);
448 break;
Heiko J Schickfab97222006-09-22 15:22:22 -0700449 default:
450 ehca_err(&shca->ib_device, "Unknown event code: %x on %s.",
451 ec, shca->ib_device.name);
452 break;
453 }
454
455 return;
456}
457
458static inline void reset_eq_pending(struct ehca_cq *cq)
459{
460 u64 CQx_EP;
461 struct h_galpa gal = cq->galpas.kernel;
462
463 hipz_galpa_store_cq(gal, cqx_ep, 0x0);
464 CQx_EP = hipz_galpa_load(gal, CQTEMM_OFFSET(cqx_ep));
465
466 return;
467}
468
David Howells7d12e782006-10-05 14:55:46 +0100469irqreturn_t ehca_interrupt_neq(int irq, void *dev_id)
Heiko J Schickfab97222006-09-22 15:22:22 -0700470{
471 struct ehca_shca *shca = (struct ehca_shca*)dev_id;
472
473 tasklet_hi_schedule(&shca->neq.interrupt_task);
474
475 return IRQ_HANDLED;
476}
477
478void ehca_tasklet_neq(unsigned long data)
479{
480 struct ehca_shca *shca = (struct ehca_shca*)data;
481 struct ehca_eqe *eqe;
482 u64 ret;
483
Jack Stone5b891a92009-05-13 16:53:39 -0700484 eqe = ehca_poll_eq(shca, &shca->neq);
Heiko J Schickfab97222006-09-22 15:22:22 -0700485
486 while (eqe) {
487 if (!EHCA_BMASK_GET(NEQE_COMPLETION_EVENT, eqe->entry))
488 parse_ec(shca, eqe->entry);
489
Jack Stone5b891a92009-05-13 16:53:39 -0700490 eqe = ehca_poll_eq(shca, &shca->neq);
Heiko J Schickfab97222006-09-22 15:22:22 -0700491 }
492
493 ret = hipz_h_reset_event(shca->ipz_hca_handle,
494 shca->neq.ipz_eq_handle, 0xFFFFFFFFFFFFFFFFL);
495
496 if (ret != H_SUCCESS)
497 ehca_err(&shca->ib_device, "Can't clear notification events.");
498
499 return;
500}
501
David Howells7d12e782006-10-05 14:55:46 +0100502irqreturn_t ehca_interrupt_eq(int irq, void *dev_id)
Heiko J Schickfab97222006-09-22 15:22:22 -0700503{
504 struct ehca_shca *shca = (struct ehca_shca*)dev_id;
505
506 tasklet_hi_schedule(&shca->eq.interrupt_task);
507
508 return IRQ_HANDLED;
509}
510
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100511
512static inline void process_eqe(struct ehca_shca *shca, struct ehca_eqe *eqe)
513{
514 u64 eqe_value;
515 u32 token;
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100516 struct ehca_cq *cq;
Hoang-Nam Nguyen31726792007-02-28 18:01:02 +0100517
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100518 eqe_value = eqe->entry;
Stephen Rothwell3750f602009-01-16 14:55:28 -0800519 ehca_dbg(&shca->ib_device, "eqe_value=%llx", eqe_value);
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100520 if (EHCA_BMASK_GET(EQE_COMPLETION_EVENT, eqe_value)) {
Hoang-Nam Nguyen31726792007-02-28 18:01:02 +0100521 ehca_dbg(&shca->ib_device, "Got completion event");
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100522 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe_value);
Joachim Fenkes26ed6872007-07-09 15:31:10 +0200523 read_lock(&ehca_cq_idr_lock);
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100524 cq = idr_find(&ehca_cq_idr, token);
Joachim Fenkes28db6be2007-07-09 15:30:39 +0200525 if (cq)
526 atomic_inc(&cq->nr_events);
Joachim Fenkes26ed6872007-07-09 15:31:10 +0200527 read_unlock(&ehca_cq_idr_lock);
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100528 if (cq == NULL) {
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100529 ehca_err(&shca->ib_device,
530 "Invalid eqe for non-existing cq token=%x",
531 token);
532 return;
533 }
534 reset_eq_pending(cq);
Hoang-Nam Nguyen31726792007-02-28 18:01:02 +0100535 if (ehca_scaling_code)
Hoang-Nam Nguyen4fd30062007-02-15 17:08:33 +0100536 queue_comp_task(cq);
Hoang-Nam Nguyen31726792007-02-28 18:01:02 +0100537 else {
Hoang-Nam Nguyen4fd30062007-02-15 17:08:33 +0100538 comp_event_callback(cq);
Joachim Fenkes28db6be2007-07-09 15:30:39 +0200539 if (atomic_dec_and_test(&cq->nr_events))
Hoang-Nam Nguyen31726792007-02-28 18:01:02 +0100540 wake_up(&cq->wait_completion);
Hoang-Nam Nguyen4fd30062007-02-15 17:08:33 +0100541 }
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100542 } else {
Hoang-Nam Nguyen31726792007-02-28 18:01:02 +0100543 ehca_dbg(&shca->ib_device, "Got non completion event");
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100544 parse_identifier(shca, eqe_value);
545 }
546}
547
548void ehca_process_eq(struct ehca_shca *shca, int is_irq)
549{
550 struct ehca_eq *eq = &shca->eq;
551 struct ehca_eqe_cache_entry *eqe_cache = eq->eqe_cache;
Stefan Roscher6f7bc012008-07-14 23:48:47 -0700552 u64 eqe_value, ret;
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100553 int eqe_cnt, i;
554 int eq_empty = 0;
555
Alexander Schmidt25ef7562010-01-27 17:01:56 +0000556 spin_lock(&eq->irq_spinlock);
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100557 if (is_irq) {
558 const int max_query_cnt = 100;
559 int query_cnt = 0;
560 int int_state = 1;
561 do {
562 int_state = hipz_h_query_int_state(
563 shca->ipz_hca_handle, eq->ist);
564 query_cnt++;
565 iosync();
566 } while (int_state && query_cnt < max_query_cnt);
567 if (unlikely((query_cnt == max_query_cnt)))
568 ehca_dbg(&shca->ib_device, "int_state=%x query_cnt=%x",
569 int_state, query_cnt);
570 }
571
572 /* read out all eqes */
573 eqe_cnt = 0;
574 do {
575 u32 token;
Jack Stone5b891a92009-05-13 16:53:39 -0700576 eqe_cache[eqe_cnt].eqe = ehca_poll_eq(shca, eq);
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100577 if (!eqe_cache[eqe_cnt].eqe)
578 break;
579 eqe_value = eqe_cache[eqe_cnt].eqe->entry;
580 if (EHCA_BMASK_GET(EQE_COMPLETION_EVENT, eqe_value)) {
581 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe_value);
Joachim Fenkes26ed6872007-07-09 15:31:10 +0200582 read_lock(&ehca_cq_idr_lock);
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100583 eqe_cache[eqe_cnt].cq = idr_find(&ehca_cq_idr, token);
Joachim Fenkes28db6be2007-07-09 15:30:39 +0200584 if (eqe_cache[eqe_cnt].cq)
585 atomic_inc(&eqe_cache[eqe_cnt].cq->nr_events);
Joachim Fenkes26ed6872007-07-09 15:31:10 +0200586 read_unlock(&ehca_cq_idr_lock);
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100587 if (!eqe_cache[eqe_cnt].cq) {
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100588 ehca_err(&shca->ib_device,
589 "Invalid eqe for non-existing cq "
590 "token=%x", token);
591 continue;
592 }
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100593 } else
594 eqe_cache[eqe_cnt].cq = NULL;
595 eqe_cnt++;
596 } while (eqe_cnt < EHCA_EQE_CACHE_SIZE);
597 if (!eqe_cnt) {
598 if (is_irq)
599 ehca_dbg(&shca->ib_device,
600 "No eqe found for irq event");
601 goto unlock_irq_spinlock;
Stefan Roscher6f7bc012008-07-14 23:48:47 -0700602 } else if (!is_irq) {
603 ret = hipz_h_eoi(eq->ist);
604 if (ret != H_SUCCESS)
605 ehca_err(&shca->ib_device,
Stephen Rothwell3750f602009-01-16 14:55:28 -0800606 "bad return code EOI -rc = %lld\n", ret);
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100607 ehca_dbg(&shca->ib_device, "deadman found %x eqe", eqe_cnt);
Stefan Roscher6f7bc012008-07-14 23:48:47 -0700608 }
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100609 if (unlikely(eqe_cnt == EHCA_EQE_CACHE_SIZE))
610 ehca_dbg(&shca->ib_device, "too many eqes for one irq event");
611 /* enable irq for new packets */
612 for (i = 0; i < eqe_cnt; i++) {
613 if (eq->eqe_cache[i].cq)
614 reset_eq_pending(eq->eqe_cache[i].cq);
615 }
616 /* check eq */
617 spin_lock(&eq->spinlock);
618 eq_empty = (!ipz_eqit_eq_peek_valid(&shca->eq.ipz_queue));
619 spin_unlock(&eq->spinlock);
620 /* call completion handler for cached eqes */
621 for (i = 0; i < eqe_cnt; i++)
622 if (eq->eqe_cache[i].cq) {
Hoang-Nam Nguyen31726792007-02-28 18:01:02 +0100623 if (ehca_scaling_code)
Hoang-Nam Nguyen4fd30062007-02-15 17:08:33 +0100624 queue_comp_task(eq->eqe_cache[i].cq);
Hoang-Nam Nguyen31726792007-02-28 18:01:02 +0100625 else {
626 struct ehca_cq *cq = eq->eqe_cache[i].cq;
627 comp_event_callback(cq);
Joachim Fenkes28db6be2007-07-09 15:30:39 +0200628 if (atomic_dec_and_test(&cq->nr_events))
Hoang-Nam Nguyen31726792007-02-28 18:01:02 +0100629 wake_up(&cq->wait_completion);
Hoang-Nam Nguyen31726792007-02-28 18:01:02 +0100630 }
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100631 } else {
632 ehca_dbg(&shca->ib_device, "Got non completion event");
633 parse_identifier(shca, eq->eqe_cache[i].eqe->entry);
634 }
635 /* poll eq if not empty */
636 if (eq_empty)
637 goto unlock_irq_spinlock;
638 do {
639 struct ehca_eqe *eqe;
Jack Stone5b891a92009-05-13 16:53:39 -0700640 eqe = ehca_poll_eq(shca, &shca->eq);
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100641 if (!eqe)
642 break;
643 process_eqe(shca, eqe);
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100644 } while (1);
645
646unlock_irq_spinlock:
Alexander Schmidt25ef7562010-01-27 17:01:56 +0000647 spin_unlock(&eq->irq_spinlock);
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100648}
649
Heiko J Schickfab97222006-09-22 15:22:22 -0700650void ehca_tasklet_eq(unsigned long data)
651{
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100652 ehca_process_eq((struct ehca_shca*)data, 1);
Heiko J Schickfab97222006-09-22 15:22:22 -0700653}
654
Hoang-Nam Nguyen2b943972007-07-12 17:53:47 +0200655static inline int find_next_online_cpu(struct ehca_comp_pool *pool)
Heiko J Schickfab97222006-09-22 15:22:22 -0700656{
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100657 int cpu;
658 unsigned long flags;
Heiko J Schickfab97222006-09-22 15:22:22 -0700659
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100660 WARN_ON_ONCE(!in_interrupt());
Joachim Fenkes4da27d62008-04-23 11:55:45 -0700661 if (ehca_debug_level >= 3)
Rusty Russellb29179c2008-12-30 09:05:18 +1030662 ehca_dmp(cpu_online_mask, cpumask_size(), "");
Heiko J Schickfab97222006-09-22 15:22:22 -0700663
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100664 spin_lock_irqsave(&pool->last_cpu_lock, flags);
Rusty Russellb29179c2008-12-30 09:05:18 +1030665 cpu = cpumask_next(pool->last_cpu, cpu_online_mask);
Mike Travis5d7bfd02008-05-12 21:21:13 +0200666 if (cpu >= nr_cpu_ids)
Rusty Russellb29179c2008-12-30 09:05:18 +1030667 cpu = cpumask_first(cpu_online_mask);
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100668 pool->last_cpu = cpu;
669 spin_unlock_irqrestore(&pool->last_cpu_lock, flags);
Heiko J Schickfab97222006-09-22 15:22:22 -0700670
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100671 return cpu;
Heiko J Schickfab97222006-09-22 15:22:22 -0700672}
673
674static void __queue_comp_task(struct ehca_cq *__cq,
675 struct ehca_cpu_comp_task *cct)
676{
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100677 unsigned long flags;
Heiko J Schickfab97222006-09-22 15:22:22 -0700678
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100679 spin_lock_irqsave(&cct->task_lock, flags);
680 spin_lock(&__cq->task_lock);
Heiko J Schickfab97222006-09-22 15:22:22 -0700681
682 if (__cq->nr_callbacks == 0) {
683 __cq->nr_callbacks++;
684 list_add_tail(&__cq->entry, &cct->cq_list);
685 cct->cq_jobs++;
686 wake_up(&cct->wait_queue);
Hoang-Nam Nguyen31726792007-02-28 18:01:02 +0100687 } else
Heiko J Schickfab97222006-09-22 15:22:22 -0700688 __cq->nr_callbacks++;
689
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100690 spin_unlock(&__cq->task_lock);
691 spin_unlock_irqrestore(&cct->task_lock, flags);
Heiko J Schickfab97222006-09-22 15:22:22 -0700692}
693
694static void queue_comp_task(struct ehca_cq *__cq)
695{
Heiko J Schickfab97222006-09-22 15:22:22 -0700696 int cpu_id;
697 struct ehca_cpu_comp_task *cct;
Hoang-Nam Nguyen31726792007-02-28 18:01:02 +0100698 int cq_jobs;
699 unsigned long flags;
Heiko J Schickfab97222006-09-22 15:22:22 -0700700
Heiko J Schickfab97222006-09-22 15:22:22 -0700701 cpu_id = find_next_online_cpu(pool);
Heiko J Schickfab97222006-09-22 15:22:22 -0700702 BUG_ON(!cpu_online(cpu_id));
703
704 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu_id);
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100705 BUG_ON(!cct);
Heiko J Schickfab97222006-09-22 15:22:22 -0700706
Hoang-Nam Nguyen31726792007-02-28 18:01:02 +0100707 spin_lock_irqsave(&cct->task_lock, flags);
708 cq_jobs = cct->cq_jobs;
709 spin_unlock_irqrestore(&cct->task_lock, flags);
710 if (cq_jobs > 0) {
Heiko J Schickfab97222006-09-22 15:22:22 -0700711 cpu_id = find_next_online_cpu(pool);
712 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu_id);
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100713 BUG_ON(!cct);
Heiko J Schickfab97222006-09-22 15:22:22 -0700714 }
715
716 __queue_comp_task(__cq, cct);
Heiko J Schickfab97222006-09-22 15:22:22 -0700717}
718
Hoang-Nam Nguyen2b943972007-07-12 17:53:47 +0200719static void run_comp_task(struct ehca_cpu_comp_task *cct)
Heiko J Schickfab97222006-09-22 15:22:22 -0700720{
721 struct ehca_cq *cq;
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100722 unsigned long flags;
Heiko J Schickfab97222006-09-22 15:22:22 -0700723
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100724 spin_lock_irqsave(&cct->task_lock, flags);
Heiko J Schickfab97222006-09-22 15:22:22 -0700725
726 while (!list_empty(&cct->cq_list)) {
727 cq = list_entry(cct->cq_list.next, struct ehca_cq, entry);
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100728 spin_unlock_irqrestore(&cct->task_lock, flags);
Heiko J Schickfab97222006-09-22 15:22:22 -0700729
Joachim Fenkes28db6be2007-07-09 15:30:39 +0200730 comp_event_callback(cq);
731 if (atomic_dec_and_test(&cq->nr_events))
Hoang-Nam Nguyen31726792007-02-28 18:01:02 +0100732 wake_up(&cq->wait_completion);
Hoang-Nam Nguyen31726792007-02-28 18:01:02 +0100733
734 spin_lock_irqsave(&cct->task_lock, flags);
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100735 spin_lock(&cq->task_lock);
Heiko J Schickfab97222006-09-22 15:22:22 -0700736 cq->nr_callbacks--;
Hoang-Nam Nguyen31726792007-02-28 18:01:02 +0100737 if (!cq->nr_callbacks) {
Heiko J Schickfab97222006-09-22 15:22:22 -0700738 list_del_init(cct->cq_list.next);
739 cct->cq_jobs--;
740 }
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100741 spin_unlock(&cq->task_lock);
Heiko J Schickfab97222006-09-22 15:22:22 -0700742 }
743
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100744 spin_unlock_irqrestore(&cct->task_lock, flags);
Heiko J Schickfab97222006-09-22 15:22:22 -0700745}
746
747static int comp_task(void *__cct)
748{
Hoang-Nam Nguyen2b943972007-07-12 17:53:47 +0200749 struct ehca_cpu_comp_task *cct = __cct;
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100750 int cql_empty;
Heiko J Schickfab97222006-09-22 15:22:22 -0700751 DECLARE_WAITQUEUE(wait, current);
752
753 set_current_state(TASK_INTERRUPTIBLE);
Hoang-Nam Nguyen2b943972007-07-12 17:53:47 +0200754 while (!kthread_should_stop()) {
Heiko J Schickfab97222006-09-22 15:22:22 -0700755 add_wait_queue(&cct->wait_queue, &wait);
756
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100757 spin_lock_irq(&cct->task_lock);
758 cql_empty = list_empty(&cct->cq_list);
759 spin_unlock_irq(&cct->task_lock);
760 if (cql_empty)
Heiko J Schickfab97222006-09-22 15:22:22 -0700761 schedule();
762 else
763 __set_current_state(TASK_RUNNING);
764
765 remove_wait_queue(&cct->wait_queue, &wait);
766
Hoang-Nam Nguyen8b16cef2007-02-15 17:07:30 +0100767 spin_lock_irq(&cct->task_lock);
768 cql_empty = list_empty(&cct->cq_list);
769 spin_unlock_irq(&cct->task_lock);
770 if (!cql_empty)
Heiko J Schickfab97222006-09-22 15:22:22 -0700771 run_comp_task(__cct);
772
773 set_current_state(TASK_INTERRUPTIBLE);
774 }
775 __set_current_state(TASK_RUNNING);
776
777 return 0;
778}
779
780static struct task_struct *create_comp_task(struct ehca_comp_pool *pool,
781 int cpu)
782{
783 struct ehca_cpu_comp_task *cct;
784
785 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
786 spin_lock_init(&cct->task_lock);
787 INIT_LIST_HEAD(&cct->cq_list);
788 init_waitqueue_head(&cct->wait_queue);
789 cct->task = kthread_create(comp_task, cct, "ehca_comp/%d", cpu);
790
791 return cct->task;
792}
793
794static void destroy_comp_task(struct ehca_comp_pool *pool,
795 int cpu)
796{
797 struct ehca_cpu_comp_task *cct;
798 struct task_struct *task;
799 unsigned long flags_cct;
800
801 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
802
803 spin_lock_irqsave(&cct->task_lock, flags_cct);
804
805 task = cct->task;
806 cct->task = NULL;
807 cct->cq_jobs = 0;
808
809 spin_unlock_irqrestore(&cct->task_lock, flags_cct);
810
811 if (task)
812 kthread_stop(task);
Heiko J Schickfab97222006-09-22 15:22:22 -0700813}
814
Satyam Sharma9faa5592007-08-23 04:58:30 +0530815static void __cpuinit take_over_work(struct ehca_comp_pool *pool, int cpu)
Heiko J Schickfab97222006-09-22 15:22:22 -0700816{
817 struct ehca_cpu_comp_task *cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
818 LIST_HEAD(list);
819 struct ehca_cq *cq;
820 unsigned long flags_cct;
821
822 spin_lock_irqsave(&cct->task_lock, flags_cct);
823
824 list_splice_init(&cct->cq_list, &list);
825
Hoang-Nam Nguyen2b943972007-07-12 17:53:47 +0200826 while (!list_empty(&list)) {
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100827 cq = list_entry(cct->cq_list.next, struct ehca_cq, entry);
Heiko J Schickfab97222006-09-22 15:22:22 -0700828
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +0100829 list_del(&cq->entry);
Christoph Lameterca0c9582009-10-03 19:48:22 +0900830 __queue_comp_task(cq, this_cpu_ptr(pool->cpu_comp_tasks));
Heiko J Schickfab97222006-09-22 15:22:22 -0700831 }
832
833 spin_unlock_irqrestore(&cct->task_lock, flags_cct);
834
835}
836
Satyam Sharma9faa5592007-08-23 04:58:30 +0530837static int __cpuinit comp_pool_callback(struct notifier_block *nfb,
838 unsigned long action,
839 void *hcpu)
Heiko J Schickfab97222006-09-22 15:22:22 -0700840{
841 unsigned int cpu = (unsigned long)hcpu;
842 struct ehca_cpu_comp_task *cct;
843
844 switch (action) {
845 case CPU_UP_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700846 case CPU_UP_PREPARE_FROZEN:
Heiko J Schickfab97222006-09-22 15:22:22 -0700847 ehca_gen_dbg("CPU: %x (CPU_PREPARE)", cpu);
Hoang-Nam Nguyen2b943972007-07-12 17:53:47 +0200848 if (!create_comp_task(pool, cpu)) {
Heiko J Schickfab97222006-09-22 15:22:22 -0700849 ehca_gen_err("Can't create comp_task for cpu: %x", cpu);
Akinobu Mita1dee31f2010-05-26 14:43:34 -0700850 return notifier_from_errno(-ENOMEM);
Heiko J Schickfab97222006-09-22 15:22:22 -0700851 }
852 break;
853 case CPU_UP_CANCELED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700854 case CPU_UP_CANCELED_FROZEN:
Heiko J Schickfab97222006-09-22 15:22:22 -0700855 ehca_gen_dbg("CPU: %x (CPU_CANCELED)", cpu);
856 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
Rusty Russellb29179c2008-12-30 09:05:18 +1030857 kthread_bind(cct->task, cpumask_any(cpu_online_mask));
Heiko J Schickfab97222006-09-22 15:22:22 -0700858 destroy_comp_task(pool, cpu);
859 break;
860 case CPU_ONLINE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700861 case CPU_ONLINE_FROZEN:
Heiko J Schickfab97222006-09-22 15:22:22 -0700862 ehca_gen_dbg("CPU: %x (CPU_ONLINE)", cpu);
863 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
864 kthread_bind(cct->task, cpu);
865 wake_up_process(cct->task);
866 break;
867 case CPU_DOWN_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700868 case CPU_DOWN_PREPARE_FROZEN:
Heiko J Schickfab97222006-09-22 15:22:22 -0700869 ehca_gen_dbg("CPU: %x (CPU_DOWN_PREPARE)", cpu);
870 break;
871 case CPU_DOWN_FAILED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700872 case CPU_DOWN_FAILED_FROZEN:
Heiko J Schickfab97222006-09-22 15:22:22 -0700873 ehca_gen_dbg("CPU: %x (CPU_DOWN_FAILED)", cpu);
874 break;
875 case CPU_DEAD:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700876 case CPU_DEAD_FROZEN:
Heiko J Schickfab97222006-09-22 15:22:22 -0700877 ehca_gen_dbg("CPU: %x (CPU_DEAD)", cpu);
878 destroy_comp_task(pool, cpu);
879 take_over_work(pool, cpu);
880 break;
881 }
882
883 return NOTIFY_OK;
884}
Satyam Sharma9faa5592007-08-23 04:58:30 +0530885
886static struct notifier_block comp_pool_callback_nb __cpuinitdata = {
887 .notifier_call = comp_pool_callback,
888 .priority = 0,
889};
Heiko J Schickfab97222006-09-22 15:22:22 -0700890
Heiko J Schickfab97222006-09-22 15:22:22 -0700891int ehca_create_comp_pool(void)
892{
Heiko J Schickfab97222006-09-22 15:22:22 -0700893 int cpu;
894 struct task_struct *task;
895
Hoang-Nam Nguyen4fd30062007-02-15 17:08:33 +0100896 if (!ehca_scaling_code)
897 return 0;
898
Heiko J Schickfab97222006-09-22 15:22:22 -0700899 pool = kzalloc(sizeof(struct ehca_comp_pool), GFP_KERNEL);
900 if (pool == NULL)
901 return -ENOMEM;
902
903 spin_lock_init(&pool->last_cpu_lock);
Rusty Russellb29179c2008-12-30 09:05:18 +1030904 pool->last_cpu = cpumask_any(cpu_online_mask);
Heiko J Schickfab97222006-09-22 15:22:22 -0700905
906 pool->cpu_comp_tasks = alloc_percpu(struct ehca_cpu_comp_task);
907 if (pool->cpu_comp_tasks == NULL) {
908 kfree(pool);
909 return -EINVAL;
910 }
911
912 for_each_online_cpu(cpu) {
913 task = create_comp_task(pool, cpu);
914 if (task) {
915 kthread_bind(task, cpu);
916 wake_up_process(task);
917 }
918 }
919
Satyam Sharma9faa5592007-08-23 04:58:30 +0530920 register_hotcpu_notifier(&comp_pool_callback_nb);
Hoang-Nam Nguyen4fd30062007-02-15 17:08:33 +0100921
922 printk(KERN_INFO "eHCA scaling code enabled\n");
Heiko J Schickfab97222006-09-22 15:22:22 -0700923
924 return 0;
925}
926
927void ehca_destroy_comp_pool(void)
928{
Heiko J Schickfab97222006-09-22 15:22:22 -0700929 int i;
930
Hoang-Nam Nguyen4fd30062007-02-15 17:08:33 +0100931 if (!ehca_scaling_code)
932 return;
933
Satyam Sharma9faa5592007-08-23 04:58:30 +0530934 unregister_hotcpu_notifier(&comp_pool_callback_nb);
Heiko J Schickfab97222006-09-22 15:22:22 -0700935
Rusty Russell259c4dd2008-12-30 09:05:17 +1030936 for_each_online_cpu(i)
937 destroy_comp_task(pool, i);
938
Akinobu Mita65e5c022007-02-05 16:21:09 -0800939 free_percpu(pool->cpu_comp_tasks);
940 kfree(pool);
Heiko J Schickfab97222006-09-22 15:22:22 -0700941}