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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
ec3d41c4 RR |
2 | #ifndef _LINUX_VIRTIO_CONFIG_H |
3 | #define _LINUX_VIRTIO_CONFIG_H | |
b4f68be6 | 4 | |
d2a7ddda | 5 | #include <linux/err.h> |
187f1882 | 6 | #include <linux/bug.h> |
72e61eb4 | 7 | #include <linux/virtio.h> |
eef960a0 | 8 | #include <linux/virtio_byteorder.h> |
a4235ec0 | 9 | #include <linux/compiler_types.h> |
607ca46e | 10 | #include <uapi/linux/virtio_config.h> |
ec3d41c4 | 11 | |
fb5e31d9 CH |
12 | struct irq_affinity; |
13 | ||
5bfe37ca SB |
14 | struct virtio_shm_region { |
15 | u64 addr; | |
16 | u64 len; | |
17 | }; | |
18 | ||
ec3d41c4 RR |
19 | /** |
20 | * virtio_config_ops - operations for configuring a virtio device | |
d1c1dad8 CH |
21 | * Note: Do not assume that a transport implements all of the operations |
22 | * getting/setting a value as a simple read/write! Generally speaking, | |
23 | * any of @get/@set, @get_status/@set_status, or @get_features/ | |
24 | * @finalize_features are NOT safe to be called from an atomic | |
25 | * context. | |
a586d4f6 | 26 | * @get: read the value of a configuration field |
ec3d41c4 | 27 | * vdev: the virtio_device |
a586d4f6 | 28 | * offset: the offset of the configuration field |
ec3d41c4 | 29 | * buf: the buffer to write the field value into. |
a586d4f6 | 30 | * len: the length of the buffer |
a586d4f6 | 31 | * @set: write the value of a configuration field |
ec3d41c4 | 32 | * vdev: the virtio_device |
a586d4f6 | 33 | * offset: the offset of the configuration field |
ec3d41c4 | 34 | * buf: the buffer to read the field value from. |
a586d4f6 | 35 | * len: the length of the buffer |
b89a07c4 | 36 | * @generation: config generation counter (optional) |
d71de9ec MT |
37 | * vdev: the virtio_device |
38 | * Returns the config generation counter | |
ec3d41c4 RR |
39 | * @get_status: read the status byte |
40 | * vdev: the virtio_device | |
41 | * Returns the status byte | |
42 | * @set_status: write the status byte | |
43 | * vdev: the virtio_device | |
44 | * status: the new status byte | |
6e5aa7ef RR |
45 | * @reset: reset the device |
46 | * vdev: the virtio device | |
47 | * After this, status and feature negotiation must be done again | |
e6af578c MT |
48 | * Device must not be reset from its vq/config callbacks, or in |
49 | * parallel with being added/removed. | |
d2a7ddda | 50 | * @find_vqs: find virtqueues and instantiate them. |
ec3d41c4 | 51 | * vdev: the virtio_device |
d2a7ddda MT |
52 | * nvqs: the number of virtqueues to find |
53 | * vqs: on success, includes new virtqueues | |
54 | * callbacks: array of callbacks, for each virtqueue | |
6457f126 | 55 | * include a NULL entry for vqs that do not need a callback |
d2a7ddda | 56 | * names: array of virtqueue names (mainly for debugging) |
6457f126 | 57 | * include a NULL entry for vqs unused by driver |
a10fba03 | 58 | * sizes: array of virtqueue sizes |
d2a7ddda MT |
59 | * Returns 0 on success or error status |
60 | * @del_vqs: free virtqueues found by find_vqs(). | |
48b69959 JW |
61 | * @synchronize_cbs: synchronize with the virtqueue callbacks (optional) |
62 | * The function guarantees that all memory operations on the | |
63 | * queue before it are visible to the vring_interrupt() that is | |
64 | * called after it. | |
65 | * vdev: the virtio_device | |
c45a6816 RR |
66 | * @get_features: get the array of feature bits for this device. |
67 | * vdev: the virtio_device | |
b89a07c4 | 68 | * Returns the first 64 feature bits (all we currently need). |
c624896e | 69 | * @finalize_features: confirm what device features we'll be using. |
c45a6816 | 70 | * vdev: the virtio_device |
4fa59ede | 71 | * This sends the driver feature bits to the device: it can change |
c624896e | 72 | * the dev->feature bits if it wants. |
4fa59ede | 73 | * Note: despite the name this can be called any number of times. |
5c609a5e | 74 | * Returns 0 on success or error status |
b89a07c4 | 75 | * @bus_name: return the bus name associated with the device (optional) |
66846048 RJ |
76 | * vdev: the virtio_device |
77 | * This returns a pointer to the bus name a la pci_name from which | |
78 | * the caller can then copy. | |
b89a07c4 | 79 | * @set_vq_affinity: set the affinity for a virtqueue (optional). |
bbaba479 | 80 | * @get_vq_affinity: get the affinity for a virtqueue (optional). |
5bfe37ca | 81 | * @get_shm_region: get a shared memory region based on the index. |
3086e9fc XZ |
82 | * @disable_vq_and_reset: reset a queue individually (optional). |
83 | * vq: the virtqueue | |
84 | * Returns 0 on success or error status | |
85 | * disable_vq_and_reset will guarantee that the callbacks are disabled and | |
86 | * synchronized. | |
87 | * Except for the callback, the caller should guarantee that the vring is | |
88 | * not accessed by any functions of virtqueue. | |
89 | * @enable_vq_after_reset: enable a reset queue | |
90 | * vq: the virtqueue | |
91 | * Returns 0 on success or error status | |
92 | * If disable_vq_and_reset is set, then enable_vq_after_reset must also be | |
93 | * set. | |
ec3d41c4 | 94 | */ |
d2a7ddda | 95 | typedef void vq_callback_t(struct virtqueue *); |
1842f23c | 96 | struct virtio_config_ops { |
a586d4f6 | 97 | void (*get)(struct virtio_device *vdev, unsigned offset, |
ec3d41c4 | 98 | void *buf, unsigned len); |
a586d4f6 | 99 | void (*set)(struct virtio_device *vdev, unsigned offset, |
ec3d41c4 | 100 | const void *buf, unsigned len); |
d71de9ec | 101 | u32 (*generation)(struct virtio_device *vdev); |
ec3d41c4 RR |
102 | u8 (*get_status)(struct virtio_device *vdev); |
103 | void (*set_status)(struct virtio_device *vdev, u8 status); | |
6e5aa7ef | 104 | void (*reset)(struct virtio_device *vdev); |
d2a7ddda | 105 | int (*find_vqs)(struct virtio_device *, unsigned nvqs, |
fb5e31d9 | 106 | struct virtqueue *vqs[], vq_callback_t *callbacks[], |
a10fba03 XZ |
107 | const char * const names[], |
108 | u32 sizes[], | |
109 | const bool *ctx, | |
f94682dd | 110 | struct irq_affinity *desc); |
d2a7ddda | 111 | void (*del_vqs)(struct virtio_device *); |
48b69959 | 112 | void (*synchronize_cbs)(struct virtio_device *); |
d0254773 | 113 | u64 (*get_features)(struct virtio_device *vdev); |
5c609a5e | 114 | int (*finalize_features)(struct virtio_device *vdev); |
66846048 | 115 | const char *(*bus_name)(struct virtio_device *vdev); |
19e226e8 CR |
116 | int (*set_vq_affinity)(struct virtqueue *vq, |
117 | const struct cpumask *cpu_mask); | |
bbaba479 CH |
118 | const struct cpumask *(*get_vq_affinity)(struct virtio_device *vdev, |
119 | int index); | |
5bfe37ca SB |
120 | bool (*get_shm_region)(struct virtio_device *vdev, |
121 | struct virtio_shm_region *region, u8 id); | |
3086e9fc XZ |
122 | int (*disable_vq_and_reset)(struct virtqueue *vq); |
123 | int (*enable_vq_after_reset)(struct virtqueue *vq); | |
ec3d41c4 RR |
124 | }; |
125 | ||
c45a6816 RR |
126 | /* If driver didn't advertise the feature, it will never appear. */ |
127 | void virtio_check_driver_offered_feature(const struct virtio_device *vdev, | |
128 | unsigned int fbit); | |
129 | ||
130 | /** | |
d4024af5 MT |
131 | * __virtio_test_bit - helper to test feature bits. For use by transports. |
132 | * Devices should normally use virtio_has_feature, | |
133 | * which includes more checks. | |
c45a6816 RR |
134 | * @vdev: the device |
135 | * @fbit: the feature bit | |
136 | */ | |
d4024af5 MT |
137 | static inline bool __virtio_test_bit(const struct virtio_device *vdev, |
138 | unsigned int fbit) | |
139 | { | |
140 | /* Did you forget to fix assumptions on max features? */ | |
141 | if (__builtin_constant_p(fbit)) | |
d0254773 | 142 | BUILD_BUG_ON(fbit >= 64); |
d4024af5 | 143 | else |
d0254773 | 144 | BUG_ON(fbit >= 64); |
d4024af5 | 145 | |
d0254773 | 146 | return vdev->features & BIT_ULL(fbit); |
d4024af5 MT |
147 | } |
148 | ||
149 | /** | |
150 | * __virtio_set_bit - helper to set feature bits. For use by transports. | |
151 | * @vdev: the device | |
152 | * @fbit: the feature bit | |
153 | */ | |
154 | static inline void __virtio_set_bit(struct virtio_device *vdev, | |
155 | unsigned int fbit) | |
156 | { | |
157 | /* Did you forget to fix assumptions on max features? */ | |
158 | if (__builtin_constant_p(fbit)) | |
d0254773 | 159 | BUILD_BUG_ON(fbit >= 64); |
d4024af5 | 160 | else |
d0254773 | 161 | BUG_ON(fbit >= 64); |
d4024af5 | 162 | |
d0254773 | 163 | vdev->features |= BIT_ULL(fbit); |
d4024af5 MT |
164 | } |
165 | ||
166 | /** | |
167 | * __virtio_clear_bit - helper to clear feature bits. For use by transports. | |
168 | * @vdev: the device | |
169 | * @fbit: the feature bit | |
170 | */ | |
171 | static inline void __virtio_clear_bit(struct virtio_device *vdev, | |
c45a6816 RR |
172 | unsigned int fbit) |
173 | { | |
174 | /* Did you forget to fix assumptions on max features? */ | |
1765e3a4 | 175 | if (__builtin_constant_p(fbit)) |
d0254773 | 176 | BUILD_BUG_ON(fbit >= 64); |
1765e3a4 | 177 | else |
d0254773 | 178 | BUG_ON(fbit >= 64); |
c45a6816 | 179 | |
d0254773 | 180 | vdev->features &= ~BIT_ULL(fbit); |
d4024af5 MT |
181 | } |
182 | ||
183 | /** | |
184 | * virtio_has_feature - helper to determine if this device has this feature. | |
185 | * @vdev: the device | |
186 | * @fbit: the feature bit | |
187 | */ | |
188 | static inline bool virtio_has_feature(const struct virtio_device *vdev, | |
189 | unsigned int fbit) | |
190 | { | |
ee006b35 MM |
191 | if (fbit < VIRTIO_TRANSPORT_F_START) |
192 | virtio_check_driver_offered_feature(vdev, fbit); | |
193 | ||
d4024af5 | 194 | return __virtio_test_bit(vdev, fbit); |
c45a6816 RR |
195 | } |
196 | ||
1a937693 | 197 | /** |
24b6842a | 198 | * virtio_has_dma_quirk - determine whether this device has the DMA quirk |
1a937693 MT |
199 | * @vdev: the device |
200 | */ | |
24b6842a | 201 | static inline bool virtio_has_dma_quirk(const struct virtio_device *vdev) |
1a937693 MT |
202 | { |
203 | /* | |
204 | * Note the reverse polarity of the quirk feature (compared to most | |
205 | * other features), this is for compatibility with legacy systems. | |
206 | */ | |
321bd212 | 207 | return !virtio_has_feature(vdev, VIRTIO_F_ACCESS_PLATFORM); |
1a937693 MT |
208 | } |
209 | ||
d2a7ddda MT |
210 | static inline |
211 | struct virtqueue *virtio_find_single_vq(struct virtio_device *vdev, | |
212 | vq_callback_t *c, const char *n) | |
213 | { | |
214 | vq_callback_t *callbacks[] = { c }; | |
215 | const char *names[] = { n }; | |
216 | struct virtqueue *vq; | |
f94682dd | 217 | int err = vdev->config->find_vqs(vdev, 1, &vq, callbacks, names, NULL, |
a10fba03 | 218 | NULL, NULL); |
d2a7ddda MT |
219 | if (err < 0) |
220 | return ERR_PTR(err); | |
221 | return vq; | |
222 | } | |
66846048 | 223 | |
9b2bbdb2 MT |
224 | static inline |
225 | int virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs, | |
226 | struct virtqueue *vqs[], vq_callback_t *callbacks[], | |
227 | const char * const names[], | |
228 | struct irq_affinity *desc) | |
229 | { | |
a10fba03 XZ |
230 | return vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names, NULL, |
231 | NULL, desc); | |
f94682dd MT |
232 | } |
233 | ||
234 | static inline | |
235 | int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs, | |
236 | struct virtqueue *vqs[], vq_callback_t *callbacks[], | |
237 | const char * const names[], const bool *ctx, | |
238 | struct irq_affinity *desc) | |
239 | { | |
a10fba03 XZ |
240 | return vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names, NULL, |
241 | ctx, desc); | |
9b2bbdb2 MT |
242 | } |
243 | ||
48b69959 JW |
244 | /** |
245 | * virtio_synchronize_cbs - synchronize with virtqueue callbacks | |
246 | * @vdev: the device | |
247 | */ | |
248 | static inline | |
249 | void virtio_synchronize_cbs(struct virtio_device *dev) | |
250 | { | |
251 | if (dev->config->synchronize_cbs) { | |
252 | dev->config->synchronize_cbs(dev); | |
253 | } else { | |
254 | /* | |
255 | * A best effort fallback to synchronize with | |
256 | * interrupts, preemption and softirq disabled | |
257 | * regions. See comment above synchronize_rcu(). | |
258 | */ | |
259 | synchronize_rcu(); | |
260 | } | |
261 | } | |
262 | ||
3569db59 MT |
263 | /** |
264 | * virtio_device_ready - enable vq use in probe function | |
265 | * @vdev: the device | |
266 | * | |
267 | * Driver must call this to use vqs in the probe function. | |
268 | * | |
269 | * Note: vqs are enabled automatically after probe returns. | |
270 | */ | |
271 | static inline | |
272 | void virtio_device_ready(struct virtio_device *dev) | |
273 | { | |
274 | unsigned status = dev->config->get_status(dev); | |
275 | ||
619e9e14 | 276 | WARN_ON(status & VIRTIO_CONFIG_S_DRIVER_OK); |
8b4ec69d | 277 | |
c346dae4 | 278 | #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION |
8b4ec69d JW |
279 | /* |
280 | * The virtio_synchronize_cbs() makes sure vring_interrupt() | |
281 | * will see the driver specific setup if it sees vq->broken | |
282 | * as false (even if the notifications come before DRIVER_OK). | |
283 | */ | |
284 | virtio_synchronize_cbs(dev); | |
285 | __virtio_unbreak_device(dev); | |
c346dae4 | 286 | #endif |
8b4ec69d JW |
287 | /* |
288 | * The transport should ensure the visibility of vq->broken | |
289 | * before setting DRIVER_OK. See the comments for the transport | |
290 | * specific set_status() method. | |
291 | * | |
292 | * A well behaved device will only notify a virtqueue after | |
293 | * DRIVER_OK, this means the device should "see" the coherenct | |
294 | * memory write that set vq->broken as false which is done by | |
295 | * the driver when it sees DRIVER_OK, then the following | |
296 | * driver's vring_interrupt() will see vq->broken as false so | |
297 | * we won't lose any notification. | |
298 | */ | |
3569db59 MT |
299 | dev->config->set_status(dev, status | VIRTIO_CONFIG_S_DRIVER_OK); |
300 | } | |
301 | ||
66846048 RJ |
302 | static inline |
303 | const char *virtio_bus_name(struct virtio_device *vdev) | |
304 | { | |
305 | if (!vdev->config->bus_name) | |
306 | return "virtio"; | |
307 | return vdev->config->bus_name(vdev); | |
308 | } | |
309 | ||
75a0a52b JW |
310 | /** |
311 | * virtqueue_set_affinity - setting affinity for a virtqueue | |
312 | * @vq: the virtqueue | |
313 | * @cpu: the cpu no. | |
314 | * | |
315 | * Pay attention the function are best-effort: the affinity hint may not be set | |
316 | * due to config support, irq type and sharing. | |
317 | * | |
318 | */ | |
319 | static inline | |
19e226e8 | 320 | int virtqueue_set_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask) |
75a0a52b JW |
321 | { |
322 | struct virtio_device *vdev = vq->vdev; | |
323 | if (vdev->config->set_vq_affinity) | |
19e226e8 | 324 | return vdev->config->set_vq_affinity(vq, cpu_mask); |
75a0a52b JW |
325 | return 0; |
326 | } | |
327 | ||
5bfe37ca SB |
328 | static inline |
329 | bool virtio_get_shm_region(struct virtio_device *vdev, | |
330 | struct virtio_shm_region *region, u8 id) | |
331 | { | |
332 | if (!vdev->config->get_shm_region) | |
333 | return false; | |
334 | return vdev->config->get_shm_region(vdev, region, id); | |
335 | } | |
336 | ||
cf561f0d GK |
337 | static inline bool virtio_is_little_endian(struct virtio_device *vdev) |
338 | { | |
7d824109 GK |
339 | return virtio_has_feature(vdev, VIRTIO_F_VERSION_1) || |
340 | virtio_legacy_is_little_endian(); | |
cf561f0d GK |
341 | } |
342 | ||
eef960a0 MT |
343 | /* Memory accessors */ |
344 | static inline u16 virtio16_to_cpu(struct virtio_device *vdev, __virtio16 val) | |
345 | { | |
cf561f0d | 346 | return __virtio16_to_cpu(virtio_is_little_endian(vdev), val); |
eef960a0 MT |
347 | } |
348 | ||
349 | static inline __virtio16 cpu_to_virtio16(struct virtio_device *vdev, u16 val) | |
350 | { | |
cf561f0d | 351 | return __cpu_to_virtio16(virtio_is_little_endian(vdev), val); |
eef960a0 MT |
352 | } |
353 | ||
354 | static inline u32 virtio32_to_cpu(struct virtio_device *vdev, __virtio32 val) | |
355 | { | |
cf561f0d | 356 | return __virtio32_to_cpu(virtio_is_little_endian(vdev), val); |
eef960a0 MT |
357 | } |
358 | ||
359 | static inline __virtio32 cpu_to_virtio32(struct virtio_device *vdev, u32 val) | |
360 | { | |
cf561f0d | 361 | return __cpu_to_virtio32(virtio_is_little_endian(vdev), val); |
eef960a0 MT |
362 | } |
363 | ||
364 | static inline u64 virtio64_to_cpu(struct virtio_device *vdev, __virtio64 val) | |
365 | { | |
cf561f0d | 366 | return __virtio64_to_cpu(virtio_is_little_endian(vdev), val); |
eef960a0 MT |
367 | } |
368 | ||
369 | static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val) | |
370 | { | |
cf561f0d | 371 | return __cpu_to_virtio64(virtio_is_little_endian(vdev), val); |
eef960a0 MT |
372 | } |
373 | ||
a5b90f2d MT |
374 | #define virtio_to_cpu(vdev, x) \ |
375 | _Generic((x), \ | |
376 | __u8: (x), \ | |
377 | __virtio16: virtio16_to_cpu((vdev), (x)), \ | |
378 | __virtio32: virtio32_to_cpu((vdev), (x)), \ | |
83eb9db9 | 379 | __virtio64: virtio64_to_cpu((vdev), (x)) \ |
a5b90f2d MT |
380 | ) |
381 | ||
382 | #define cpu_to_virtio(vdev, x, m) \ | |
383 | _Generic((m), \ | |
384 | __u8: (x), \ | |
385 | __virtio16: cpu_to_virtio16((vdev), (x)), \ | |
386 | __virtio32: cpu_to_virtio32((vdev), (x)), \ | |
83eb9db9 | 387 | __virtio64: cpu_to_virtio64((vdev), (x)) \ |
a5b90f2d | 388 | ) |
a4235ec0 MT |
389 | |
390 | #define __virtio_native_type(structname, member) \ | |
a5b90f2d | 391 | typeof(virtio_to_cpu(NULL, ((structname*)0)->member)) |
a4235ec0 | 392 | |
0b90d062 RR |
393 | /* Config space accessors. */ |
394 | #define virtio_cread(vdev, structname, member, ptr) \ | |
395 | do { \ | |
a5b90f2d MT |
396 | typeof(((structname*)0)->member) virtio_cread_v; \ |
397 | \ | |
ab7a2375 | 398 | might_sleep(); \ |
a5b90f2d MT |
399 | /* Sanity check: must match the member's type */ \ |
400 | typecheck(typeof(virtio_to_cpu((vdev), virtio_cread_v)), *(ptr)); \ | |
0b90d062 | 401 | \ |
a5b90f2d | 402 | switch (sizeof(virtio_cread_v)) { \ |
0b90d062 | 403 | case 1: \ |
0b90d062 | 404 | case 2: \ |
0b90d062 | 405 | case 4: \ |
a5b90f2d MT |
406 | vdev->config->get((vdev), \ |
407 | offsetof(structname, member), \ | |
408 | &virtio_cread_v, \ | |
409 | sizeof(virtio_cread_v)); \ | |
0b90d062 RR |
410 | break; \ |
411 | default: \ | |
a5b90f2d MT |
412 | __virtio_cread_many((vdev), \ |
413 | offsetof(structname, member), \ | |
414 | &virtio_cread_v, \ | |
415 | 1, \ | |
416 | sizeof(virtio_cread_v)); \ | |
417 | break; \ | |
0b90d062 | 418 | } \ |
a5b90f2d | 419 | *(ptr) = virtio_to_cpu(vdev, virtio_cread_v); \ |
0b90d062 RR |
420 | } while(0) |
421 | ||
422 | /* Config space accessors. */ | |
423 | #define virtio_cwrite(vdev, structname, member, ptr) \ | |
424 | do { \ | |
a5b90f2d MT |
425 | typeof(((structname*)0)->member) virtio_cwrite_v = \ |
426 | cpu_to_virtio(vdev, *(ptr), ((structname*)0)->member); \ | |
427 | \ | |
ab7a2375 | 428 | might_sleep(); \ |
a5b90f2d MT |
429 | /* Sanity check: must match the member's type */ \ |
430 | typecheck(typeof(virtio_to_cpu((vdev), virtio_cwrite_v)), *(ptr)); \ | |
0b90d062 | 431 | \ |
a5b90f2d MT |
432 | vdev->config->set((vdev), offsetof(structname, member), \ |
433 | &virtio_cwrite_v, \ | |
434 | sizeof(virtio_cwrite_v)); \ | |
0b90d062 RR |
435 | } while(0) |
436 | ||
e598960f MT |
437 | /* |
438 | * Nothing virtio-specific about these, but let's worry about generalizing | |
439 | * these later. | |
440 | */ | |
441 | #define virtio_le_to_cpu(x) \ | |
442 | _Generic((x), \ | |
c84f91e2 MT |
443 | __u8: (u8)(x), \ |
444 | __le16: (u16)le16_to_cpu(x), \ | |
445 | __le32: (u32)le32_to_cpu(x), \ | |
446 | __le64: (u64)le64_to_cpu(x) \ | |
e598960f MT |
447 | ) |
448 | ||
449 | #define virtio_cpu_to_le(x, m) \ | |
450 | _Generic((m), \ | |
451 | __u8: (x), \ | |
452 | __le16: cpu_to_le16(x), \ | |
453 | __le32: cpu_to_le32(x), \ | |
454 | __le64: cpu_to_le64(x) \ | |
455 | ) | |
456 | ||
457 | /* LE (e.g. modern) Config space accessors. */ | |
458 | #define virtio_cread_le(vdev, structname, member, ptr) \ | |
459 | do { \ | |
460 | typeof(((structname*)0)->member) virtio_cread_v; \ | |
461 | \ | |
462 | might_sleep(); \ | |
463 | /* Sanity check: must match the member's type */ \ | |
464 | typecheck(typeof(virtio_le_to_cpu(virtio_cread_v)), *(ptr)); \ | |
465 | \ | |
466 | switch (sizeof(virtio_cread_v)) { \ | |
467 | case 1: \ | |
468 | case 2: \ | |
469 | case 4: \ | |
470 | vdev->config->get((vdev), \ | |
471 | offsetof(structname, member), \ | |
472 | &virtio_cread_v, \ | |
473 | sizeof(virtio_cread_v)); \ | |
474 | break; \ | |
475 | default: \ | |
476 | __virtio_cread_many((vdev), \ | |
477 | offsetof(structname, member), \ | |
478 | &virtio_cread_v, \ | |
479 | 1, \ | |
480 | sizeof(virtio_cread_v)); \ | |
481 | break; \ | |
482 | } \ | |
483 | *(ptr) = virtio_le_to_cpu(virtio_cread_v); \ | |
484 | } while(0) | |
485 | ||
e598960f MT |
486 | #define virtio_cwrite_le(vdev, structname, member, ptr) \ |
487 | do { \ | |
488 | typeof(((structname*)0)->member) virtio_cwrite_v = \ | |
489 | virtio_cpu_to_le(*(ptr), ((structname*)0)->member); \ | |
490 | \ | |
491 | might_sleep(); \ | |
492 | /* Sanity check: must match the member's type */ \ | |
493 | typecheck(typeof(virtio_le_to_cpu(virtio_cwrite_v)), *(ptr)); \ | |
494 | \ | |
495 | vdev->config->set((vdev), offsetof(structname, member), \ | |
496 | &virtio_cwrite_v, \ | |
497 | sizeof(virtio_cwrite_v)); \ | |
498 | } while(0) | |
499 | ||
500 | ||
d71de9ec MT |
501 | /* Read @count fields, @bytes each. */ |
502 | static inline void __virtio_cread_many(struct virtio_device *vdev, | |
503 | unsigned int offset, | |
504 | void *buf, size_t count, size_t bytes) | |
505 | { | |
506 | u32 old, gen = vdev->config->generation ? | |
507 | vdev->config->generation(vdev) : 0; | |
508 | int i; | |
509 | ||
ab7a2375 | 510 | might_sleep(); |
d71de9ec MT |
511 | do { |
512 | old = gen; | |
513 | ||
514 | for (i = 0; i < count; i++) | |
515 | vdev->config->get(vdev, offset + bytes * i, | |
516 | buf + i * bytes, bytes); | |
517 | ||
518 | gen = vdev->config->generation ? | |
519 | vdev->config->generation(vdev) : 0; | |
520 | } while (gen != old); | |
521 | } | |
522 | ||
0b90d062 RR |
523 | static inline void virtio_cread_bytes(struct virtio_device *vdev, |
524 | unsigned int offset, | |
525 | void *buf, size_t len) | |
526 | { | |
d71de9ec | 527 | __virtio_cread_many(vdev, offset, buf, len, 1); |
0b90d062 RR |
528 | } |
529 | ||
caa0e2d0 MT |
530 | static inline u8 virtio_cread8(struct virtio_device *vdev, unsigned int offset) |
531 | { | |
532 | u8 ret; | |
ab7a2375 CH |
533 | |
534 | might_sleep(); | |
caa0e2d0 MT |
535 | vdev->config->get(vdev, offset, &ret, sizeof(ret)); |
536 | return ret; | |
537 | } | |
538 | ||
0b90d062 RR |
539 | static inline void virtio_cwrite8(struct virtio_device *vdev, |
540 | unsigned int offset, u8 val) | |
541 | { | |
ab7a2375 | 542 | might_sleep(); |
0b90d062 RR |
543 | vdev->config->set(vdev, offset, &val, sizeof(val)); |
544 | } | |
545 | ||
546 | static inline u16 virtio_cread16(struct virtio_device *vdev, | |
547 | unsigned int offset) | |
548 | { | |
cacaf775 | 549 | __virtio16 ret; |
ab7a2375 CH |
550 | |
551 | might_sleep(); | |
0b90d062 | 552 | vdev->config->get(vdev, offset, &ret, sizeof(ret)); |
cacaf775 | 553 | return virtio16_to_cpu(vdev, ret); |
0b90d062 RR |
554 | } |
555 | ||
556 | static inline void virtio_cwrite16(struct virtio_device *vdev, | |
557 | unsigned int offset, u16 val) | |
558 | { | |
cacaf775 MT |
559 | __virtio16 v; |
560 | ||
ab7a2375 | 561 | might_sleep(); |
cacaf775 MT |
562 | v = cpu_to_virtio16(vdev, val); |
563 | vdev->config->set(vdev, offset, &v, sizeof(v)); | |
0b90d062 RR |
564 | } |
565 | ||
566 | static inline u32 virtio_cread32(struct virtio_device *vdev, | |
567 | unsigned int offset) | |
568 | { | |
cacaf775 | 569 | __virtio32 ret; |
ab7a2375 CH |
570 | |
571 | might_sleep(); | |
0b90d062 | 572 | vdev->config->get(vdev, offset, &ret, sizeof(ret)); |
cacaf775 | 573 | return virtio32_to_cpu(vdev, ret); |
0b90d062 RR |
574 | } |
575 | ||
576 | static inline void virtio_cwrite32(struct virtio_device *vdev, | |
577 | unsigned int offset, u32 val) | |
578 | { | |
cacaf775 MT |
579 | __virtio32 v; |
580 | ||
ab7a2375 | 581 | might_sleep(); |
cacaf775 MT |
582 | v = cpu_to_virtio32(vdev, val); |
583 | vdev->config->set(vdev, offset, &v, sizeof(v)); | |
0b90d062 RR |
584 | } |
585 | ||
586 | static inline u64 virtio_cread64(struct virtio_device *vdev, | |
587 | unsigned int offset) | |
588 | { | |
cacaf775 MT |
589 | __virtio64 ret; |
590 | ||
d71de9ec | 591 | __virtio_cread_many(vdev, offset, &ret, 1, sizeof(ret)); |
cacaf775 | 592 | return virtio64_to_cpu(vdev, ret); |
0b90d062 RR |
593 | } |
594 | ||
595 | static inline void virtio_cwrite64(struct virtio_device *vdev, | |
596 | unsigned int offset, u64 val) | |
597 | { | |
cacaf775 MT |
598 | __virtio64 v; |
599 | ||
ab7a2375 | 600 | might_sleep(); |
cacaf775 MT |
601 | v = cpu_to_virtio64(vdev, val); |
602 | vdev->config->set(vdev, offset, &v, sizeof(v)); | |
0b90d062 RR |
603 | } |
604 | ||
605 | /* Conditional config space accessors. */ | |
606 | #define virtio_cread_feature(vdev, fbit, structname, member, ptr) \ | |
607 | ({ \ | |
608 | int _r = 0; \ | |
609 | if (!virtio_has_feature(vdev, fbit)) \ | |
610 | _r = -ENOENT; \ | |
611 | else \ | |
612 | virtio_cread((vdev), structname, member, ptr); \ | |
613 | _r; \ | |
614 | }) | |
75a0a52b | 615 | |
035ce421 MT |
616 | /* Conditional config space accessors. */ |
617 | #define virtio_cread_le_feature(vdev, fbit, structname, member, ptr) \ | |
618 | ({ \ | |
619 | int _r = 0; \ | |
620 | if (!virtio_has_feature(vdev, fbit)) \ | |
621 | _r = -ENOENT; \ | |
622 | else \ | |
623 | virtio_cread_le((vdev), structname, member, ptr); \ | |
624 | _r; \ | |
625 | }) | |
0afa15e1 | 626 | |
ec3d41c4 | 627 | #endif /* _LINUX_VIRTIO_CONFIG_H */ |