1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
3 * Copyright(c) 2018 - 2020 Intel Corporation.
12 * msix_initialize() - Calculate, request and configure MSIx IRQs
13 * @dd: valid hfi1 devdata
16 int msix_initialize(struct hfi1_devdata *dd)
20 struct hfi1_msix_entry *entries;
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.
30 total = 1 + dd->num_sdma + dd->n_krcv_queues + dd->num_netdev_contexts;
32 if (total >= CCE_NUM_MSIX_VECTORS)
35 ret = pci_alloc_irq_vectors(dd->pcidev, total, total, PCI_IRQ_MSIX);
37 dd_dev_err(dd, "pci_alloc_irq_vectors() failed: %d\n", ret);
41 entries = kcalloc(total, sizeof(*dd->msix_info.msix_entries),
44 pci_free_irq_vectors(dd->pcidev);
48 dd->msix_info.msix_entries = entries;
49 spin_lock_init(&dd->msix_info.msix_lock);
50 bitmap_zero(dd->msix_info.in_use_msix, total);
51 dd->msix_info.max_requested = total;
52 dd_dev_info(dd, "%u MSI-X interrupts allocated\n", total);
58 * msix_request_irq() - Allocate a free MSIx IRQ
60 * @arg: context information for the IRQ
61 * @handler: IRQ handler
62 * @thread: IRQ thread handler (could be NULL)
63 * @type: affinty IRQ type
66 * Allocated an MSIx vector if available, and then create the appropriate
67 * meta data needed to keep track of the pci IRQ request.
74 static 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)
81 struct hfi1_msix_entry *me;
83 /* Allocate an MSIx vector */
84 spin_lock(&dd->msix_info.msix_lock);
85 nr = find_first_zero_bit(dd->msix_info.in_use_msix,
86 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(&dd->msix_info.msix_lock);
91 if (nr == dd->msix_info.max_requested)
94 if (type < IRQ_SDMA || type >= IRQ_OTHER)
97 irq = pci_irq_vector(dd->pcidev, nr);
98 ret = pci_request_irq(dd->pcidev, nr, handler, thread, arg, name);
101 "%s: request for IRQ %d failed, MSIx %lx, err %d\n",
103 spin_lock(&dd->msix_info.msix_lock);
104 __clear_bit(nr, dd->msix_info.in_use_msix);
105 spin_unlock(&dd->msix_info.msix_lock);
110 * assign arg after pci_request_irq call, so it will be
113 me = &dd->msix_info.msix_entries[nr];
118 /* This is a request, so a failure is not fatal */
119 ret = hfi1_get_irq_affinity(dd, me);
121 dd_dev_err(dd, "%s: unable to pin IRQ %d\n", name, ret);
126 static int msix_request_rcd_irq_common(struct hfi1_ctxtdata *rcd,
127 irq_handler_t handler,
128 irq_handler_t thread,
131 int nr = msix_request_irq(rcd->dd, rcd, handler, thread,
132 rcd->is_vnic ? IRQ_NETDEVCTXT : IRQ_RCVCTXT,
138 * Set the interrupt register and mask for this
139 * context's interrupt.
141 rcd->ireg = (IS_RCVAVAIL_START + rcd->ctxt) / 64;
142 rcd->imask = ((u64)1) << ((IS_RCVAVAIL_START + rcd->ctxt) % 64);
144 remap_intr(rcd->dd, IS_RCVAVAIL_START + rcd->ctxt, nr);
150 * msix_request_rcd_irq() - Helper function for RCVAVAIL IRQs
151 * @rcd: valid rcd context
154 int msix_request_rcd_irq(struct hfi1_ctxtdata *rcd)
156 char name[MAX_NAME_SIZE];
158 snprintf(name, sizeof(name), DRIVER_NAME "_%d kctxt%d",
159 rcd->dd->unit, rcd->ctxt);
161 return msix_request_rcd_irq_common(rcd, receive_context_interrupt,
162 receive_context_thread, name);
166 * msix_netdev_request_rcd_irq - Helper function for RCVAVAIL IRQs
168 * @rcd: valid netdev contexti
170 int msix_netdev_request_rcd_irq(struct hfi1_ctxtdata *rcd)
172 char name[MAX_NAME_SIZE];
174 snprintf(name, sizeof(name), DRIVER_NAME "_%d nd kctxt%d",
175 rcd->dd->unit, rcd->ctxt);
176 return msix_request_rcd_irq_common(rcd, receive_context_interrupt_napi,
181 * msix_request_sdma_irq - Helper for getting SDMA IRQ resources
182 * @sde: valid sdma engine
185 int msix_request_sdma_irq(struct sdma_engine *sde)
188 char name[MAX_NAME_SIZE];
190 snprintf(name, sizeof(name), DRIVER_NAME "_%d sdma%d",
191 sde->dd->unit, sde->this_idx);
192 nr = msix_request_irq(sde->dd, sde, sdma_interrupt, NULL,
197 remap_sdma_interrupts(sde->dd, sde->this_idx, nr);
203 * msix_request_general_irq - Helper for getting general IRQ
205 * @dd: valid device data
207 int msix_request_general_irq(struct hfi1_devdata *dd)
210 char name[MAX_NAME_SIZE];
212 snprintf(name, sizeof(name), DRIVER_NAME "_%d", dd->unit);
213 nr = msix_request_irq(dd, dd, general_interrupt, NULL, IRQ_GENERAL,
218 /* general interrupt must be MSIx vector 0 */
220 msix_free_irq(dd, (u8)nr);
221 dd_dev_err(dd, "Invalid index %d for GENERAL IRQ\n", nr);
229 * enable_sdma_srcs - Helper to enable SDMA IRQ srcs
230 * @dd: valid devdata structure
231 * @i: index of SDMA engine
233 static void enable_sdma_srcs(struct hfi1_devdata *dd, int i)
235 set_intr_bits(dd, IS_SDMA_START + i, IS_SDMA_START + i, true);
236 set_intr_bits(dd, IS_SDMA_PROGRESS_START + i,
237 IS_SDMA_PROGRESS_START + i, true);
238 set_intr_bits(dd, IS_SDMA_IDLE_START + i, IS_SDMA_IDLE_START + i, true);
239 set_intr_bits(dd, IS_SDMAENG_ERR_START + i, IS_SDMAENG_ERR_START + i,
244 * msix_request_irqs() - Allocate all MSIx IRQs
245 * @dd: valid devdata structure
247 * Helper function to request the used MSIx IRQs.
250 int msix_request_irqs(struct hfi1_devdata *dd)
253 int ret = msix_request_general_irq(dd);
258 for (i = 0; i < dd->num_sdma; i++) {
259 struct sdma_engine *sde = &dd->per_sdma[i];
261 ret = msix_request_sdma_irq(sde);
264 enable_sdma_srcs(sde->dd, i);
267 for (i = 0; i < dd->n_krcv_queues; i++) {
268 struct hfi1_ctxtdata *rcd = hfi1_rcd_get_by_index_safe(dd, i);
271 ret = msix_request_rcd_irq(rcd);
281 * msix_free_irq() - Free the specified MSIx resources and IRQ
283 * @msix_intr: MSIx vector to free.
286 void msix_free_irq(struct hfi1_devdata *dd, u8 msix_intr)
288 struct hfi1_msix_entry *me;
290 if (msix_intr >= dd->msix_info.max_requested)
293 me = &dd->msix_info.msix_entries[msix_intr];
295 if (!me->arg) /* => no irq, no affinity */
298 hfi1_put_irq_affinity(dd, me);
299 pci_free_irq(dd->pcidev, msix_intr, me->arg);
303 spin_lock(&dd->msix_info.msix_lock);
304 __clear_bit(msix_intr, dd->msix_info.in_use_msix);
305 spin_unlock(&dd->msix_info.msix_lock);
309 * msix_clean_up_interrupts - Free all MSIx IRQ resources
310 * @dd: valid device data data structure
312 * Free the MSIx and associated PCI resources, if they have been allocated.
314 void msix_clean_up_interrupts(struct hfi1_devdata *dd)
317 struct hfi1_msix_entry *me = dd->msix_info.msix_entries;
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, i);
323 /* clean structures */
324 kfree(dd->msix_info.msix_entries);
325 dd->msix_info.msix_entries = NULL;
326 dd->msix_info.max_requested = 0;
328 pci_free_irq_vectors(dd->pcidev);
332 * msix_netdev_synchronize_irq - netdev IRQ synchronize
335 void msix_netdev_synchronize_irq(struct hfi1_devdata *dd)
338 int ctxt_count = hfi1_netdev_ctxt_count(dd);
340 for (i = 0; i < ctxt_count; i++) {
341 struct hfi1_ctxtdata *rcd = hfi1_netdev_get_ctxt(dd, i);
342 struct hfi1_msix_entry *me;
344 me = &dd->msix_info.msix_entries[rcd->msix_intr];
346 synchronize_irq(me->irq);