1// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2/*
3 * Copyright(c) 2018 - 2020 Intel Corporation.
4 */
5
6#include "hfi.h"
7#include "affinity.h"
8#include "sdma.h"
9#include "netdev.h"
10
11/**
12 * msix_initialize() - Calculate, request and configure MSIx IRQs
13 * @dd: valid hfi1 devdata
14 *
15 */
16int msix_initialize(struct hfi1_devdata *dd)
17{
18 u32 total;
19 int ret;
20 struct hfi1_msix_entry *entries;
21
22 /*
23 * MSIx interrupt count:
24 * one for the general, "slow path" interrupt
25 * one per used SDMA engine
26 * one per kernel receive context
27 * one for each VNIC context
28 * ...any new IRQs should be added here.
29 */
30 total = 1 + dd->num_sdma + dd->n_krcv_queues + dd->num_netdev_contexts;
31
32 if (total >= CCE_NUM_MSIX_VECTORS)
33 return -EINVAL;
34
35 ret = pci_alloc_irq_vectors(dev: dd->pcidev, min_vecs: total, max_vecs: total, PCI_IRQ_MSIX);
36 if (ret < 0) {
37 dd_dev_err(dd, "pci_alloc_irq_vectors() failed: %d\n", ret);
38 return ret;
39 }
40
41 entries = kcalloc(total, sizeof(*dd->msix_info.msix_entries),
42 GFP_KERNEL);
43 if (!entries) {
44 pci_free_irq_vectors(dev: dd->pcidev);
45 return -ENOMEM;
46 }
47
48 dd->msix_info.msix_entries = entries;
49 spin_lock_init(&dd->msix_info.msix_lock);
50 bitmap_zero(dst: dd->msix_info.in_use_msix, nbits: total);
51 dd->msix_info.max_requested = total;
52 dd_dev_info(dd, "%u MSI-X interrupts allocated\n", total);
53
54 return 0;
55}
56
57/**
58 * msix_request_irq() - Allocate a free MSIx IRQ
59 * @dd: valid devdata
60 * @arg: context information for the IRQ
61 * @handler: IRQ handler
62 * @thread: IRQ thread handler (could be NULL)
63 * @type: affinty IRQ type
64 * @name: IRQ name
65 *
66 * Allocated an MSIx vector if available, and then create the appropriate
67 * meta data needed to keep track of the pci IRQ request.
68 *
69 * Return:
70 * < 0 Error
71 * >= 0 MSIx vector
72 *
73 */
74static int msix_request_irq(struct hfi1_devdata *dd, void *arg,
75 irq_handler_t handler, irq_handler_t thread,
76 enum irq_type type, const char *name)
77{
78 unsigned long nr;
79 int irq;
80 int ret;
81 struct hfi1_msix_entry *me;
82
83 /* Allocate an MSIx vector */
84 spin_lock(lock: &dd->msix_info.msix_lock);
85 nr = find_first_zero_bit(addr: dd->msix_info.in_use_msix,
86 size: dd->msix_info.max_requested);
87 if (nr < dd->msix_info.max_requested)
88 __set_bit(nr, dd->msix_info.in_use_msix);
89 spin_unlock(lock: &dd->msix_info.msix_lock);
90
91 if (nr == dd->msix_info.max_requested)
92 return -ENOSPC;
93
94 if (type < IRQ_SDMA || type >= IRQ_OTHER)
95 return -EINVAL;
96
97 irq = pci_irq_vector(dev: dd->pcidev, nr);
98 ret = pci_request_irq(dev: dd->pcidev, nr, handler, thread_fn: thread, dev_id: arg, fmt: name);
99 if (ret) {
100 dd_dev_err(dd,
101 "%s: request for IRQ %d failed, MSIx %lx, err %d\n",
102 name, irq, nr, ret);
103 spin_lock(lock: &dd->msix_info.msix_lock);
104 __clear_bit(nr, dd->msix_info.in_use_msix);
105 spin_unlock(lock: &dd->msix_info.msix_lock);
106 return ret;
107 }
108
109 /*
110 * assign arg after pci_request_irq call, so it will be
111 * cleaned up
112 */
113 me = &dd->msix_info.msix_entries[nr];
114 me->irq = irq;
115 me->arg = arg;
116 me->type = type;
117
118 /* This is a request, so a failure is not fatal */
119 ret = hfi1_get_irq_affinity(dd, msix: me);
120 if (ret)
121 dd_dev_err(dd, "%s: unable to pin IRQ %d\n", name, ret);
122
123 return nr;
124}
125
126static int msix_request_rcd_irq_common(struct hfi1_ctxtdata *rcd,
127 irq_handler_t handler,
128 irq_handler_t thread,
129 const char *name)
130{
131 int nr = msix_request_irq(dd: rcd->dd, arg: rcd, handler, thread,
132 type: rcd->is_vnic ? IRQ_NETDEVCTXT : IRQ_RCVCTXT,
133 name);
134 if (nr < 0)
135 return nr;
136
137 /*
138 * Set the interrupt register and mask for this
139 * context's interrupt.
140 */
141 rcd->ireg = (IS_RCVAVAIL_START + rcd->ctxt) / 64;
142 rcd->imask = ((u64)1) << ((IS_RCVAVAIL_START + rcd->ctxt) % 64);
143 rcd->msix_intr = nr;
144 remap_intr(dd: rcd->dd, IS_RCVAVAIL_START + rcd->ctxt, msix_intr: nr);
145
146 return 0;
147}
148
149/**
150 * msix_request_rcd_irq() - Helper function for RCVAVAIL IRQs
151 * @rcd: valid rcd context
152 *
153 */
154int msix_request_rcd_irq(struct hfi1_ctxtdata *rcd)
155{
156 char name[MAX_NAME_SIZE];
157
158 snprintf(buf: name, size: sizeof(name), DRIVER_NAME "_%d kctxt%d",
159 rcd->dd->unit, rcd->ctxt);
160
161 return msix_request_rcd_irq_common(rcd, handler: receive_context_interrupt,
162 thread: receive_context_thread, name);
163}
164
165/**
166 * msix_netdev_request_rcd_irq - Helper function for RCVAVAIL IRQs
167 * for netdev context
168 * @rcd: valid netdev contexti
169 */
170int msix_netdev_request_rcd_irq(struct hfi1_ctxtdata *rcd)
171{
172 char name[MAX_NAME_SIZE];
173
174 snprintf(buf: name, size: sizeof(name), DRIVER_NAME "_%d nd kctxt%d",
175 rcd->dd->unit, rcd->ctxt);
176 return msix_request_rcd_irq_common(rcd, handler: receive_context_interrupt_napi,
177 NULL, name);
178}
179
180/**
181 * msix_request_sdma_irq - Helper for getting SDMA IRQ resources
182 * @sde: valid sdma engine
183 *
184 */
185int msix_request_sdma_irq(struct sdma_engine *sde)
186{
187 int nr;
188 char name[MAX_NAME_SIZE];
189
190 snprintf(buf: name, size: sizeof(name), DRIVER_NAME "_%d sdma%d",
191 sde->dd->unit, sde->this_idx);
192 nr = msix_request_irq(dd: sde->dd, arg: sde, handler: sdma_interrupt, NULL,
193 type: IRQ_SDMA, name);
194 if (nr < 0)
195 return nr;
196 sde->msix_intr = nr;
197 remap_sdma_interrupts(dd: sde->dd, engine: sde->this_idx, msix_intr: nr);
198
199 return 0;
200}
201
202/**
203 * msix_request_general_irq - Helper for getting general IRQ
204 * resources
205 * @dd: valid device data
206 */
207int msix_request_general_irq(struct hfi1_devdata *dd)
208{
209 int nr;
210 char name[MAX_NAME_SIZE];
211
212 snprintf(buf: name, size: sizeof(name), DRIVER_NAME "_%d", dd->unit);
213 nr = msix_request_irq(dd, arg: dd, handler: general_interrupt, NULL, type: IRQ_GENERAL,
214 name);
215 if (nr < 0)
216 return nr;
217
218 /* general interrupt must be MSIx vector 0 */
219 if (nr) {
220 msix_free_irq(dd, msix_intr: (u8)nr);
221 dd_dev_err(dd, "Invalid index %d for GENERAL IRQ\n", nr);
222 return -EINVAL;
223 }
224
225 return 0;
226}
227
228/**
229 * enable_sdma_srcs - Helper to enable SDMA IRQ srcs
230 * @dd: valid devdata structure
231 * @i: index of SDMA engine
232 */
233static void enable_sdma_srcs(struct hfi1_devdata *dd, int i)
234{
235 set_intr_bits(dd, IS_SDMA_START + i, IS_SDMA_START + i, set: true);
236 set_intr_bits(dd, IS_SDMA_PROGRESS_START + i,
237 IS_SDMA_PROGRESS_START + i, set: true);
238 set_intr_bits(dd, IS_SDMA_IDLE_START + i, IS_SDMA_IDLE_START + i, set: true);
239 set_intr_bits(dd, IS_SDMAENG_ERR_START + i, IS_SDMAENG_ERR_START + i,
240 set: true);
241}
242
243/**
244 * msix_request_irqs() - Allocate all MSIx IRQs
245 * @dd: valid devdata structure
246 *
247 * Helper function to request the used MSIx IRQs.
248 *
249 */
250int msix_request_irqs(struct hfi1_devdata *dd)
251{
252 int i;
253 int ret = msix_request_general_irq(dd);
254
255 if (ret)
256 return ret;
257
258 for (i = 0; i < dd->num_sdma; i++) {
259 struct sdma_engine *sde = &dd->per_sdma[i];
260
261 ret = msix_request_sdma_irq(sde);
262 if (ret)
263 return ret;
264 enable_sdma_srcs(dd: sde->dd, i);
265 }
266
267 for (i = 0; i < dd->n_krcv_queues; i++) {
268 struct hfi1_ctxtdata *rcd = hfi1_rcd_get_by_index_safe(dd, ctxt: i);
269
270 if (rcd)
271 ret = msix_request_rcd_irq(rcd);
272 hfi1_rcd_put(rcd);
273 if (ret)
274 return ret;
275 }
276
277 return 0;
278}
279
280/**
281 * msix_free_irq() - Free the specified MSIx resources and IRQ
282 * @dd: valid devdata
283 * @msix_intr: MSIx vector to free.
284 *
285 */
286void msix_free_irq(struct hfi1_devdata *dd, u8 msix_intr)
287{
288 struct hfi1_msix_entry *me;
289
290 if (msix_intr >= dd->msix_info.max_requested)
291 return;
292
293 me = &dd->msix_info.msix_entries[msix_intr];
294
295 if (!me->arg) /* => no irq, no affinity */
296 return;
297
298 hfi1_put_irq_affinity(dd, msix: me);
299 pci_free_irq(dev: dd->pcidev, nr: msix_intr, dev_id: me->arg);
300
301 me->arg = NULL;
302
303 spin_lock(lock: &dd->msix_info.msix_lock);
304 __clear_bit(msix_intr, dd->msix_info.in_use_msix);
305 spin_unlock(lock: &dd->msix_info.msix_lock);
306}
307
308/**
309 * msix_clean_up_interrupts - Free all MSIx IRQ resources
310 * @dd: valid device data data structure
311 *
312 * Free the MSIx and associated PCI resources, if they have been allocated.
313 */
314void msix_clean_up_interrupts(struct hfi1_devdata *dd)
315{
316 int i;
317 struct hfi1_msix_entry *me = dd->msix_info.msix_entries;
318
319 /* remove irqs - must happen before disabling/turning off */
320 for (i = 0; i < dd->msix_info.max_requested; i++, me++)
321 msix_free_irq(dd, msix_intr: i);
322
323 /* clean structures */
324 kfree(objp: dd->msix_info.msix_entries);
325 dd->msix_info.msix_entries = NULL;
326 dd->msix_info.max_requested = 0;
327
328 pci_free_irq_vectors(dev: dd->pcidev);
329}
330
331/**
332 * msix_netdev_synchronize_irq - netdev IRQ synchronize
333 * @dd: valid devdata
334 */
335void msix_netdev_synchronize_irq(struct hfi1_devdata *dd)
336{
337 int i;
338 int ctxt_count = hfi1_netdev_ctxt_count(dd);
339
340 for (i = 0; i < ctxt_count; i++) {
341 struct hfi1_ctxtdata *rcd = hfi1_netdev_get_ctxt(dd, ctxt: i);
342 struct hfi1_msix_entry *me;
343
344 me = &dd->msix_info.msix_entries[rcd->msix_intr];
345
346 synchronize_irq(irq: me->irq);
347 }
348}
349

source code of linux/drivers/infiniband/hw/hfi1/msix.c