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Linux/kernel/irq/msi.c

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  1 /*
  2  * linux/kernel/irq/msi.c
  3  *
  4  * Copyright (C) 2014 Intel Corp.
  5  * Author: Jiang Liu <jiang.liu@linux.intel.com>
  6  *
  7  * This file is licensed under GPLv2.
  8  *
  9  * This file contains common code to support Message Signalled Interrupt for
 10  * PCI compatible and non PCI compatible devices.
 11  */
 12 #include <linux/types.h>
 13 #include <linux/device.h>
 14 #include <linux/irq.h>
 15 #include <linux/irqdomain.h>
 16 #include <linux/msi.h>
 17 
 18 /* Temparory solution for building, will be removed later */
 19 #include <linux/pci.h>
 20 
 21 struct msi_desc *alloc_msi_entry(struct device *dev)
 22 {
 23         struct msi_desc *desc = kzalloc(sizeof(*desc), GFP_KERNEL);
 24         if (!desc)
 25                 return NULL;
 26 
 27         INIT_LIST_HEAD(&desc->list);
 28         desc->dev = dev;
 29 
 30         return desc;
 31 }
 32 
 33 void free_msi_entry(struct msi_desc *entry)
 34 {
 35         kfree(entry);
 36 }
 37 
 38 void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
 39 {
 40         *msg = entry->msg;
 41 }
 42 
 43 void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)
 44 {
 45         struct msi_desc *entry = irq_get_msi_desc(irq);
 46 
 47         __get_cached_msi_msg(entry, msg);
 48 }
 49 EXPORT_SYMBOL_GPL(get_cached_msi_msg);
 50 
 51 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
 52 static inline void irq_chip_write_msi_msg(struct irq_data *data,
 53                                           struct msi_msg *msg)
 54 {
 55         data->chip->irq_write_msi_msg(data, msg);
 56 }
 57 
 58 /**
 59  * msi_domain_set_affinity - Generic affinity setter function for MSI domains
 60  * @irq_data:   The irq data associated to the interrupt
 61  * @mask:       The affinity mask to set
 62  * @force:      Flag to enforce setting (disable online checks)
 63  *
 64  * Intended to be used by MSI interrupt controllers which are
 65  * implemented with hierarchical domains.
 66  */
 67 int msi_domain_set_affinity(struct irq_data *irq_data,
 68                             const struct cpumask *mask, bool force)
 69 {
 70         struct irq_data *parent = irq_data->parent_data;
 71         struct msi_msg msg;
 72         int ret;
 73 
 74         ret = parent->chip->irq_set_affinity(parent, mask, force);
 75         if (ret >= 0 && ret != IRQ_SET_MASK_OK_DONE) {
 76                 BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg));
 77                 irq_chip_write_msi_msg(irq_data, &msg);
 78         }
 79 
 80         return ret;
 81 }
 82 
 83 static void msi_domain_activate(struct irq_domain *domain,
 84                                 struct irq_data *irq_data)
 85 {
 86         struct msi_msg msg;
 87 
 88         BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg));
 89         irq_chip_write_msi_msg(irq_data, &msg);
 90 }
 91 
 92 static void msi_domain_deactivate(struct irq_domain *domain,
 93                                   struct irq_data *irq_data)
 94 {
 95         struct msi_msg msg;
 96 
 97         memset(&msg, 0, sizeof(msg));
 98         irq_chip_write_msi_msg(irq_data, &msg);
 99 }
100 
101 static int msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
102                             unsigned int nr_irqs, void *arg)
103 {
104         struct msi_domain_info *info = domain->host_data;
105         struct msi_domain_ops *ops = info->ops;
106         irq_hw_number_t hwirq = ops->get_hwirq(info, arg);
107         int i, ret;
108 
109         if (irq_find_mapping(domain, hwirq) > 0)
110                 return -EEXIST;
111 
112         ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
113         if (ret < 0)
114                 return ret;
115 
116         for (i = 0; i < nr_irqs; i++) {
117                 ret = ops->msi_init(domain, info, virq + i, hwirq + i, arg);
118                 if (ret < 0) {
119                         if (ops->msi_free) {
120                                 for (i--; i > 0; i--)
121                                         ops->msi_free(domain, info, virq + i);
122                         }
123                         irq_domain_free_irqs_top(domain, virq, nr_irqs);
124                         return ret;
125                 }
126         }
127 
128         return 0;
129 }
130 
131 static void msi_domain_free(struct irq_domain *domain, unsigned int virq,
132                             unsigned int nr_irqs)
133 {
134         struct msi_domain_info *info = domain->host_data;
135         int i;
136 
137         if (info->ops->msi_free) {
138                 for (i = 0; i < nr_irqs; i++)
139                         info->ops->msi_free(domain, info, virq + i);
140         }
141         irq_domain_free_irqs_top(domain, virq, nr_irqs);
142 }
143 
144 static const struct irq_domain_ops msi_domain_ops = {
145         .alloc          = msi_domain_alloc,
146         .free           = msi_domain_free,
147         .activate       = msi_domain_activate,
148         .deactivate     = msi_domain_deactivate,
149 };
150 
151 #ifdef GENERIC_MSI_DOMAIN_OPS
152 static irq_hw_number_t msi_domain_ops_get_hwirq(struct msi_domain_info *info,
153                                                 msi_alloc_info_t *arg)
154 {
155         return arg->hwirq;
156 }
157 
158 static int msi_domain_ops_prepare(struct irq_domain *domain, struct device *dev,
159                                   int nvec, msi_alloc_info_t *arg)
160 {
161         memset(arg, 0, sizeof(*arg));
162         return 0;
163 }
164 
165 static void msi_domain_ops_set_desc(msi_alloc_info_t *arg,
166                                     struct msi_desc *desc)
167 {
168         arg->desc = desc;
169 }
170 #else
171 #define msi_domain_ops_get_hwirq        NULL
172 #define msi_domain_ops_prepare          NULL
173 #define msi_domain_ops_set_desc         NULL
174 #endif /* !GENERIC_MSI_DOMAIN_OPS */
175 
176 static int msi_domain_ops_init(struct irq_domain *domain,
177                                struct msi_domain_info *info,
178                                unsigned int virq, irq_hw_number_t hwirq,
179                                msi_alloc_info_t *arg)
180 {
181         irq_domain_set_hwirq_and_chip(domain, virq, hwirq, info->chip,
182                                       info->chip_data);
183         if (info->handler && info->handler_name) {
184                 __irq_set_handler(virq, info->handler, 0, info->handler_name);
185                 if (info->handler_data)
186                         irq_set_handler_data(virq, info->handler_data);
187         }
188         return 0;
189 }
190 
191 static int msi_domain_ops_check(struct irq_domain *domain,
192                                 struct msi_domain_info *info,
193                                 struct device *dev)
194 {
195         return 0;
196 }
197 
198 static struct msi_domain_ops msi_domain_ops_default = {
199         .get_hwirq      = msi_domain_ops_get_hwirq,
200         .msi_init       = msi_domain_ops_init,
201         .msi_check      = msi_domain_ops_check,
202         .msi_prepare    = msi_domain_ops_prepare,
203         .set_desc       = msi_domain_ops_set_desc,
204 };
205 
206 static void msi_domain_update_dom_ops(struct msi_domain_info *info)
207 {
208         struct msi_domain_ops *ops = info->ops;
209 
210         if (ops == NULL) {
211                 info->ops = &msi_domain_ops_default;
212                 return;
213         }
214 
215         if (ops->get_hwirq == NULL)
216                 ops->get_hwirq = msi_domain_ops_default.get_hwirq;
217         if (ops->msi_init == NULL)
218                 ops->msi_init = msi_domain_ops_default.msi_init;
219         if (ops->msi_check == NULL)
220                 ops->msi_check = msi_domain_ops_default.msi_check;
221         if (ops->msi_prepare == NULL)
222                 ops->msi_prepare = msi_domain_ops_default.msi_prepare;
223         if (ops->set_desc == NULL)
224                 ops->set_desc = msi_domain_ops_default.set_desc;
225 }
226 
227 static void msi_domain_update_chip_ops(struct msi_domain_info *info)
228 {
229         struct irq_chip *chip = info->chip;
230 
231         BUG_ON(!chip || !chip->irq_mask || !chip->irq_unmask);
232         if (!chip->irq_set_affinity)
233                 chip->irq_set_affinity = msi_domain_set_affinity;
234 }
235 
236 /**
237  * msi_create_irq_domain - Create a MSI interrupt domain
238  * @of_node:    Optional device-tree node of the interrupt controller
239  * @info:       MSI domain info
240  * @parent:     Parent irq domain
241  */
242 struct irq_domain *msi_create_irq_domain(struct device_node *node,
243                                          struct msi_domain_info *info,
244                                          struct irq_domain *parent)
245 {
246         if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
247                 msi_domain_update_dom_ops(info);
248         if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
249                 msi_domain_update_chip_ops(info);
250 
251         return irq_domain_add_hierarchy(parent, 0, 0, node, &msi_domain_ops,
252                                         info);
253 }
254 
255 /**
256  * msi_domain_alloc_irqs - Allocate interrupts from a MSI interrupt domain
257  * @domain:     The domain to allocate from
258  * @dev:        Pointer to device struct of the device for which the interrupts
259  *              are allocated
260  * @nvec:       The number of interrupts to allocate
261  *
262  * Returns 0 on success or an error code.
263  */
264 int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
265                           int nvec)
266 {
267         struct msi_domain_info *info = domain->host_data;
268         struct msi_domain_ops *ops = info->ops;
269         msi_alloc_info_t arg;
270         struct msi_desc *desc;
271         int i, ret, virq = -1;
272 
273         ret = ops->msi_check(domain, info, dev);
274         if (ret == 0)
275                 ret = ops->msi_prepare(domain, dev, nvec, &arg);
276         if (ret)
277                 return ret;
278 
279         for_each_msi_entry(desc, dev) {
280                 ops->set_desc(&arg, desc);
281                 if (info->flags & MSI_FLAG_IDENTITY_MAP)
282                         virq = (int)ops->get_hwirq(info, &arg);
283                 else
284                         virq = -1;
285 
286                 virq = __irq_domain_alloc_irqs(domain, virq, desc->nvec_used,
287                                                dev_to_node(dev), &arg, false);
288                 if (virq < 0) {
289                         ret = -ENOSPC;
290                         if (ops->handle_error)
291                                 ret = ops->handle_error(domain, desc, ret);
292                         if (ops->msi_finish)
293                                 ops->msi_finish(&arg, ret);
294                         return ret;
295                 }
296 
297                 for (i = 0; i < desc->nvec_used; i++)
298                         irq_set_msi_desc_off(virq, i, desc);
299         }
300 
301         if (ops->msi_finish)
302                 ops->msi_finish(&arg, 0);
303 
304         for_each_msi_entry(desc, dev) {
305                 if (desc->nvec_used == 1)
306                         dev_dbg(dev, "irq %d for MSI\n", virq);
307                 else
308                         dev_dbg(dev, "irq [%d-%d] for MSI\n",
309                                 virq, virq + desc->nvec_used - 1);
310         }
311 
312         return 0;
313 }
314 
315 /**
316  * msi_domain_free_irqs - Free interrupts from a MSI interrupt @domain associated tp @dev
317  * @domain:     The domain to managing the interrupts
318  * @dev:        Pointer to device struct of the device for which the interrupts
319  *              are free
320  */
321 void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
322 {
323         struct msi_desc *desc;
324 
325         for_each_msi_entry(desc, dev) {
326                 /*
327                  * We might have failed to allocate an MSI early
328                  * enough that there is no IRQ associated to this
329                  * entry. If that's the case, don't do anything.
330                  */
331                 if (desc->irq) {
332                         irq_domain_free_irqs(desc->irq, desc->nvec_used);
333                         desc->irq = 0;
334                 }
335         }
336 }
337 
338 /**
339  * msi_get_domain_info - Get the MSI interrupt domain info for @domain
340  * @domain:     The interrupt domain to retrieve data from
341  *
342  * Returns the pointer to the msi_domain_info stored in
343  * @domain->host_data.
344  */
345 struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain)
346 {
347         return (struct msi_domain_info *)domain->host_data;
348 }
349 
350 #endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
351 

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