1 // SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
2 /* Copyright(c) 2014 - 2020 Intel Corporation */
3 #include <linux/kernel.h>
4 #include <linux/init.h>
5 #include <linux/types.h>
6 #include <linux/pci.h>
7 #include <linux/slab.h>
8 #include <linux/errno.h>
9 #include <linux/interrupt.h>
10 #include <linux/workqueue.h>
11 #include "adf_accel_devices.h"
12 #include "adf_common_drv.h"
13 #include "adf_cfg.h"
14 #include "adf_cfg_strings.h"
15 #include "adf_cfg_common.h"
16 #include "adf_transport_access_macros.h"
17 #include "adf_transport_internal.h"
18
19 #define ADF_VINTSOU_OFFSET 0x204
20 #define ADF_VINTMSK_OFFSET 0x208
21 #define ADF_VINTSOU_BUN BIT(0)
22 #define ADF_VINTSOU_PF2VF BIT(1)
23
24 static struct workqueue_struct *adf_vf_stop_wq;
25
26 struct adf_vf_stop_data {
27 struct adf_accel_dev *accel_dev;
28 struct work_struct work;
29 };
30
adf_enable_pf2vf_interrupts(struct adf_accel_dev * accel_dev)31 void adf_enable_pf2vf_interrupts(struct adf_accel_dev *accel_dev)
32 {
33 void __iomem *pmisc_addr = adf_get_pmisc_base(accel_dev);
34
35 ADF_CSR_WR(pmisc_addr, ADF_VINTMSK_OFFSET, 0x0);
36 }
37
adf_disable_pf2vf_interrupts(struct adf_accel_dev * accel_dev)38 void adf_disable_pf2vf_interrupts(struct adf_accel_dev *accel_dev)
39 {
40 void __iomem *pmisc_addr = adf_get_pmisc_base(accel_dev);
41
42 ADF_CSR_WR(pmisc_addr, ADF_VINTMSK_OFFSET, 0x2);
43 }
44 EXPORT_SYMBOL_GPL(adf_disable_pf2vf_interrupts);
45
adf_enable_msi(struct adf_accel_dev * accel_dev)46 static int adf_enable_msi(struct adf_accel_dev *accel_dev)
47 {
48 struct adf_accel_pci *pci_dev_info = &accel_dev->accel_pci_dev;
49 int stat = pci_alloc_irq_vectors(pci_dev_info->pci_dev, 1, 1,
50 PCI_IRQ_MSI);
51 if (unlikely(stat < 0)) {
52 dev_err(&GET_DEV(accel_dev),
53 "Failed to enable MSI interrupt: %d\n", stat);
54 return stat;
55 }
56
57 return 0;
58 }
59
adf_disable_msi(struct adf_accel_dev * accel_dev)60 static void adf_disable_msi(struct adf_accel_dev *accel_dev)
61 {
62 struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
63
64 pci_free_irq_vectors(pdev);
65 }
66
adf_dev_stop_async(struct work_struct * work)67 static void adf_dev_stop_async(struct work_struct *work)
68 {
69 struct adf_vf_stop_data *stop_data =
70 container_of(work, struct adf_vf_stop_data, work);
71 struct adf_accel_dev *accel_dev = stop_data->accel_dev;
72
73 adf_dev_restarting_notify(accel_dev);
74 adf_dev_down(accel_dev, false);
75
76 /* Re-enable PF2VF interrupts */
77 adf_enable_pf2vf_interrupts(accel_dev);
78 kfree(stop_data);
79 }
80
adf_pf2vf_handle_pf_restarting(struct adf_accel_dev * accel_dev)81 int adf_pf2vf_handle_pf_restarting(struct adf_accel_dev *accel_dev)
82 {
83 struct adf_vf_stop_data *stop_data;
84
85 clear_bit(ADF_STATUS_PF_RUNNING, &accel_dev->status);
86 stop_data = kzalloc(sizeof(*stop_data), GFP_ATOMIC);
87 if (!stop_data) {
88 dev_err(&GET_DEV(accel_dev),
89 "Couldn't schedule stop for vf_%d\n",
90 accel_dev->accel_id);
91 return -ENOMEM;
92 }
93 stop_data->accel_dev = accel_dev;
94 INIT_WORK(&stop_data->work, adf_dev_stop_async);
95 queue_work(adf_vf_stop_wq, &stop_data->work);
96
97 return 0;
98 }
99
adf_pf2vf_bh_handler(void * data)100 static void adf_pf2vf_bh_handler(void *data)
101 {
102 struct adf_accel_dev *accel_dev = data;
103 bool ret;
104
105 ret = adf_recv_and_handle_pf2vf_msg(accel_dev);
106 if (ret)
107 /* Re-enable PF2VF interrupts */
108 adf_enable_pf2vf_interrupts(accel_dev);
109
110 return;
111
112 }
113
adf_setup_pf2vf_bh(struct adf_accel_dev * accel_dev)114 static int adf_setup_pf2vf_bh(struct adf_accel_dev *accel_dev)
115 {
116 tasklet_init(&accel_dev->vf.pf2vf_bh_tasklet,
117 (void *)adf_pf2vf_bh_handler, (unsigned long)accel_dev);
118
119 mutex_init(&accel_dev->vf.vf2pf_lock);
120 return 0;
121 }
122
adf_cleanup_pf2vf_bh(struct adf_accel_dev * accel_dev)123 static void adf_cleanup_pf2vf_bh(struct adf_accel_dev *accel_dev)
124 {
125 tasklet_disable(&accel_dev->vf.pf2vf_bh_tasklet);
126 tasklet_kill(&accel_dev->vf.pf2vf_bh_tasklet);
127 mutex_destroy(&accel_dev->vf.vf2pf_lock);
128 }
129
adf_isr(int irq,void * privdata)130 static irqreturn_t adf_isr(int irq, void *privdata)
131 {
132 struct adf_accel_dev *accel_dev = privdata;
133 struct adf_hw_device_data *hw_data = accel_dev->hw_device;
134 struct adf_hw_csr_ops *csr_ops = &hw_data->csr_ops;
135 struct adf_bar *pmisc =
136 &GET_BARS(accel_dev)[hw_data->get_misc_bar_id(hw_data)];
137 void __iomem *pmisc_bar_addr = pmisc->virt_addr;
138 bool handled = false;
139 u32 v_int, v_mask;
140
141 /* Read VF INT source CSR to determine the source of VF interrupt */
142 v_int = ADF_CSR_RD(pmisc_bar_addr, ADF_VINTSOU_OFFSET);
143
144 /* Read VF INT mask CSR to determine which sources are masked */
145 v_mask = ADF_CSR_RD(pmisc_bar_addr, ADF_VINTMSK_OFFSET);
146
147 /*
148 * Recompute v_int ignoring sources that are masked. This is to
149 * avoid rescheduling the tasklet for interrupts already handled
150 */
151 v_int &= ~v_mask;
152
153 /* Check for PF2VF interrupt */
154 if (v_int & ADF_VINTSOU_PF2VF) {
155 /* Disable PF to VF interrupt */
156 adf_disable_pf2vf_interrupts(accel_dev);
157
158 /* Schedule tasklet to handle interrupt BH */
159 tasklet_hi_schedule(&accel_dev->vf.pf2vf_bh_tasklet);
160 handled = true;
161 }
162
163 /* Check bundle interrupt */
164 if (v_int & ADF_VINTSOU_BUN) {
165 struct adf_etr_data *etr_data = accel_dev->transport;
166 struct adf_etr_bank_data *bank = &etr_data->banks[0];
167
168 /* Disable Flag and Coalesce Ring Interrupts */
169 csr_ops->write_csr_int_flag_and_col(bank->csr_addr,
170 bank->bank_number, 0);
171 tasklet_hi_schedule(&bank->resp_handler);
172 handled = true;
173 }
174
175 return handled ? IRQ_HANDLED : IRQ_NONE;
176 }
177
adf_request_msi_irq(struct adf_accel_dev * accel_dev)178 static int adf_request_msi_irq(struct adf_accel_dev *accel_dev)
179 {
180 struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
181 unsigned int cpu;
182 int ret;
183
184 snprintf(accel_dev->vf.irq_name, ADF_MAX_MSIX_VECTOR_NAME,
185 "qat_%02x:%02d.%02d", pdev->bus->number, PCI_SLOT(pdev->devfn),
186 PCI_FUNC(pdev->devfn));
187 ret = request_irq(pdev->irq, adf_isr, 0, accel_dev->vf.irq_name,
188 (void *)accel_dev);
189 if (ret) {
190 dev_err(&GET_DEV(accel_dev), "failed to enable irq for %s\n",
191 accel_dev->vf.irq_name);
192 return ret;
193 }
194 cpu = accel_dev->accel_id % num_online_cpus();
195 irq_set_affinity_hint(pdev->irq, get_cpu_mask(cpu));
196 accel_dev->vf.irq_enabled = true;
197
198 return ret;
199 }
200
adf_setup_bh(struct adf_accel_dev * accel_dev)201 static int adf_setup_bh(struct adf_accel_dev *accel_dev)
202 {
203 struct adf_etr_data *priv_data = accel_dev->transport;
204
205 tasklet_init(&priv_data->banks[0].resp_handler, adf_response_handler,
206 (unsigned long)priv_data->banks);
207 return 0;
208 }
209
adf_cleanup_bh(struct adf_accel_dev * accel_dev)210 static void adf_cleanup_bh(struct adf_accel_dev *accel_dev)
211 {
212 struct adf_etr_data *priv_data = accel_dev->transport;
213
214 tasklet_disable(&priv_data->banks[0].resp_handler);
215 tasklet_kill(&priv_data->banks[0].resp_handler);
216 }
217
218 /**
219 * adf_vf_isr_resource_free() - Free IRQ for acceleration device
220 * @accel_dev: Pointer to acceleration device.
221 *
222 * Function frees interrupts for acceleration device virtual function.
223 */
adf_vf_isr_resource_free(struct adf_accel_dev * accel_dev)224 void adf_vf_isr_resource_free(struct adf_accel_dev *accel_dev)
225 {
226 struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
227
228 if (accel_dev->vf.irq_enabled) {
229 irq_set_affinity_hint(pdev->irq, NULL);
230 free_irq(pdev->irq, accel_dev);
231 }
232 adf_cleanup_bh(accel_dev);
233 adf_cleanup_pf2vf_bh(accel_dev);
234 adf_disable_msi(accel_dev);
235 }
236 EXPORT_SYMBOL_GPL(adf_vf_isr_resource_free);
237
238 /**
239 * adf_vf_isr_resource_alloc() - Allocate IRQ for acceleration device
240 * @accel_dev: Pointer to acceleration device.
241 *
242 * Function allocates interrupts for acceleration device virtual function.
243 *
244 * Return: 0 on success, error code otherwise.
245 */
adf_vf_isr_resource_alloc(struct adf_accel_dev * accel_dev)246 int adf_vf_isr_resource_alloc(struct adf_accel_dev *accel_dev)
247 {
248 if (adf_enable_msi(accel_dev))
249 goto err_out;
250
251 if (adf_setup_pf2vf_bh(accel_dev))
252 goto err_disable_msi;
253
254 if (adf_setup_bh(accel_dev))
255 goto err_cleanup_pf2vf_bh;
256
257 if (adf_request_msi_irq(accel_dev))
258 goto err_cleanup_bh;
259
260 return 0;
261
262 err_cleanup_bh:
263 adf_cleanup_bh(accel_dev);
264
265 err_cleanup_pf2vf_bh:
266 adf_cleanup_pf2vf_bh(accel_dev);
267
268 err_disable_msi:
269 adf_disable_msi(accel_dev);
270
271 err_out:
272 return -EFAULT;
273 }
274 EXPORT_SYMBOL_GPL(adf_vf_isr_resource_alloc);
275
276 /**
277 * adf_flush_vf_wq() - Flush workqueue for VF
278 * @accel_dev: Pointer to acceleration device.
279 *
280 * Function disables the PF/VF interrupts on the VF so that no new messages
281 * are received and flushes the workqueue 'adf_vf_stop_wq'.
282 *
283 * Return: void.
284 */
adf_flush_vf_wq(struct adf_accel_dev * accel_dev)285 void adf_flush_vf_wq(struct adf_accel_dev *accel_dev)
286 {
287 adf_disable_pf2vf_interrupts(accel_dev);
288
289 flush_workqueue(adf_vf_stop_wq);
290 }
291 EXPORT_SYMBOL_GPL(adf_flush_vf_wq);
292
293 /**
294 * adf_init_vf_wq() - Init workqueue for VF
295 *
296 * Function init workqueue 'adf_vf_stop_wq' for VF.
297 *
298 * Return: 0 on success, error code otherwise.
299 */
adf_init_vf_wq(void)300 int __init adf_init_vf_wq(void)
301 {
302 adf_vf_stop_wq = alloc_workqueue("adf_vf_stop_wq", WQ_MEM_RECLAIM, 0);
303
304 return !adf_vf_stop_wq ? -EFAULT : 0;
305 }
306
adf_exit_vf_wq(void)307 void adf_exit_vf_wq(void)
308 {
309 if (adf_vf_stop_wq)
310 destroy_workqueue(adf_vf_stop_wq);
311
312 adf_vf_stop_wq = NULL;
313 }
314