Lines Matching refs:pp
116 static int pp_find_next_peer(struct pp_ctx *pp)
121 link = ntb_link_is_up(pp->ntb, NULL, NULL);
124 if (link & pp->nmask)
125 pidx = __ffs64(link & pp->nmask);
126 else if (link & pp->pmask)
127 pidx = __ffs64(link & pp->pmask);
131 out_db = BIT_ULL(ntb_peer_port_number(pp->ntb, pidx));
133 spin_lock(&pp->lock);
134 pp->out_pidx = pidx;
135 pp->out_db = out_db;
136 spin_unlock(&pp->lock);
141 static void pp_setup(struct pp_ctx *pp)
145 ntb_db_set_mask(pp->ntb, pp->in_db);
147 hrtimer_cancel(&pp->timer);
149 ret = pp_find_next_peer(pp);
151 dev_dbg(&pp->ntb->dev, "Got no peers, so cancel\n");
155 dev_dbg(&pp->ntb->dev, "Ping-pong started with port %d, db %#llx\n",
156 ntb_peer_port_number(pp->ntb, pp->out_pidx), pp->out_db);
158 hrtimer_start(&pp->timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
161 static void pp_clear(struct pp_ctx *pp)
163 hrtimer_cancel(&pp->timer);
165 ntb_db_set_mask(pp->ntb, pp->in_db);
167 dev_dbg(&pp->ntb->dev, "Ping-pong cancelled\n");
170 static void pp_ping(struct pp_ctx *pp)
174 count = atomic_read(&pp->count);
176 spin_lock(&pp->lock);
177 ntb_peer_spad_write(pp->ntb, pp->out_pidx, 0, count);
178 ntb_peer_msg_write(pp->ntb, pp->out_pidx, 0, count);
180 dev_dbg(&pp->ntb->dev, "Ping port %d spad %#x, msg %#x\n",
181 ntb_peer_port_number(pp->ntb, pp->out_pidx), count, count);
183 ntb_peer_db_set(pp->ntb, pp->out_db);
184 ntb_db_clear_mask(pp->ntb, pp->in_db);
185 spin_unlock(&pp->lock);
188 static void pp_pong(struct pp_ctx *pp)
194 spad_data = ntb_spad_read(pp->ntb, 0);
195 msg_data = ntb_msg_read(pp->ntb, &pidx, 0);
196 ntb_msg_clear_sts(pp->ntb, -1);
203 dev_dbg(&pp->ntb->dev, "Pong spad %#x, msg %#x (port %d)\n",
204 spad_data, msg_data, ntb_peer_port_number(pp->ntb, pidx));
206 atomic_inc(&pp->count);
208 ntb_db_set_mask(pp->ntb, pp->in_db);
209 ntb_db_clear(pp->ntb, pp->in_db);
211 hrtimer_start(&pp->timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
216 struct pp_ctx *pp = to_pp_timer(t);
218 pp_ping(pp);
225 struct pp_ctx *pp = ctx;
227 pp_setup(pp);
232 struct pp_ctx *pp = ctx;
234 pp_pong(pp);
278 struct pp_ctx *pp;
280 pp = devm_kzalloc(&ntb->dev, sizeof(*pp), GFP_KERNEL);
281 if (!pp)
284 pp->ntb = ntb;
285 atomic_set(&pp->count, 0);
286 spin_lock_init(&pp->lock);
287 hrtimer_init(&pp->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
288 pp->timer.function = pp_timer_func;
290 return pp;
293 static void pp_init_flds(struct pp_ctx *pp)
298 lport = ntb_port_number(pp->ntb);
299 pcnt = ntb_peer_port_count(pp->ntb);
301 if (lport < ntb_peer_port_number(pp->ntb, pidx))
305 pp->in_db = BIT_ULL(lport);
306 pp->pmask = GENMASK_ULL(pidx, 0) >> 1;
307 pp->nmask = GENMASK_ULL(pcnt - 1, pidx);
309 dev_dbg(&pp->ntb->dev, "Inbound db %#llx, prev %#llx, next %#llx\n",
310 pp->in_db, pp->pmask, pp->nmask);
313 static int pp_mask_events(struct pp_ctx *pp)
318 db_mask = ntb_db_valid_mask(pp->ntb);
319 ret = ntb_db_set_mask(pp->ntb, db_mask);
324 if (ntb_msg_count(pp->ntb) < 1)
327 msg_mask = ntb_msg_outbits(pp->ntb) | ntb_msg_inbits(pp->ntb);
328 return ntb_msg_set_mask(pp->ntb, msg_mask);
331 static int pp_setup_ctx(struct pp_ctx *pp)
335 ret = ntb_set_ctx(pp->ntb, pp, &pp_ops);
339 ntb_link_enable(pp->ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO);
341 ntb_link_event(pp->ntb);
346 static void pp_clear_ctx(struct pp_ctx *pp)
348 ntb_link_disable(pp->ntb);
350 ntb_clear_ctx(pp->ntb);
353 static void pp_setup_dbgfs(struct pp_ctx *pp)
355 struct pci_dev *pdev = pp->ntb->pdev;
357 pp->dbgfs_dir = debugfs_create_dir(pci_name(pdev), pp_dbgfs_topdir);
359 debugfs_create_atomic_t("count", 0600, pp->dbgfs_dir, &pp->count);
362 static void pp_clear_dbgfs(struct pp_ctx *pp)
364 debugfs_remove_recursive(pp->dbgfs_dir);
369 struct pp_ctx *pp;
376 pp = pp_create_data(ntb);
377 if (IS_ERR(pp))
378 return PTR_ERR(pp);
380 pp_init_flds(pp);
382 ret = pp_mask_events(pp);
386 ret = pp_setup_ctx(pp);
390 pp_setup_dbgfs(pp);
397 struct pp_ctx *pp = ntb->ctx;
399 pp_clear_dbgfs(pp);
401 pp_clear_ctx(pp);
403 pp_clear(pp);