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f33f5fe2 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
edfd52e6 PM |
2 | /* |
3 | * Virtio memory mapped device driver | |
4 | * | |
1862ee22 | 5 | * Copyright 2011-2014, ARM Ltd. |
edfd52e6 PM |
6 | * |
7 | * This module allows virtio devices to be used over a virtual, memory mapped | |
8 | * platform device. | |
9 | * | |
81a054ce PM |
10 | * The guest device(s) may be instantiated in one of three equivalent ways: |
11 | * | |
12 | * 1. Static platform device in board's code, eg.: | |
13 | * | |
14 | * static struct platform_device v2m_virtio_device = { | |
15 | * .name = "virtio-mmio", | |
16 | * .id = -1, | |
17 | * .num_resources = 2, | |
18 | * .resource = (struct resource []) { | |
19 | * { | |
20 | * .start = 0x1001e000, | |
21 | * .end = 0x1001e0ff, | |
22 | * .flags = IORESOURCE_MEM, | |
23 | * }, { | |
24 | * .start = 42 + 32, | |
25 | * .end = 42 + 32, | |
26 | * .flags = IORESOURCE_IRQ, | |
27 | * }, | |
28 | * } | |
29 | * }; | |
30 | * | |
31 | * 2. Device Tree node, eg.: | |
32 | * | |
33 | * virtio_block@1e000 { | |
34 | * compatible = "virtio,mmio"; | |
35 | * reg = <0x1e000 0x100>; | |
36 | * interrupts = <42>; | |
37 | * } | |
38 | * | |
39 | * 3. Kernel module (or command line) parameter. Can be used more than once - | |
40 | * one device will be created for each one. Syntax: | |
41 | * | |
42 | * [virtio_mmio.]device=<size>@<baseaddr>:<irq>[:<id>] | |
43 | * where: | |
44 | * <size> := size (can use standard suffixes like K, M or G) | |
45 | * <baseaddr> := physical base address | |
46 | * <irq> := interrupt number (as passed to request_irq()) | |
47 | * <id> := (optional) platform device id | |
48 | * eg.: | |
49 | * virtio_mmio.device=0x100@0x100b0000:48 \ | |
50 | * virtio_mmio.device=1K@0x1001e000:74 | |
51 | * | |
edfd52e6 | 52 | * Based on Virtio PCI driver by Anthony Liguori, copyright IBM Corp. 2007 |
edfd52e6 PM |
53 | */ |
54 | ||
81a054ce PM |
55 | #define pr_fmt(fmt) "virtio-mmio: " fmt |
56 | ||
38c4ab8e | 57 | #include <linux/acpi.h> |
f7f6634d | 58 | #include <linux/dma-mapping.h> |
edfd52e6 PM |
59 | #include <linux/highmem.h> |
60 | #include <linux/interrupt.h> | |
61 | #include <linux/io.h> | |
62 | #include <linux/list.h> | |
63 | #include <linux/module.h> | |
64 | #include <linux/platform_device.h> | |
65 | #include <linux/slab.h> | |
66 | #include <linux/spinlock.h> | |
67 | #include <linux/virtio.h> | |
68 | #include <linux/virtio_config.h> | |
51be7a9a | 69 | #include <uapi/linux/virtio_mmio.h> |
edfd52e6 PM |
70 | #include <linux/virtio_ring.h> |
71 | ||
72 | ||
73 | ||
74 | /* The alignment to use between consumer and producer parts of vring. | |
75 | * Currently hardcoded to the page size. */ | |
76 | #define VIRTIO_MMIO_VRING_ALIGN PAGE_SIZE | |
77 | ||
78 | ||
79 | ||
80 | #define to_virtio_mmio_device(_plat_dev) \ | |
81 | container_of(_plat_dev, struct virtio_mmio_device, vdev) | |
82 | ||
83 | struct virtio_mmio_device { | |
84 | struct virtio_device vdev; | |
85 | struct platform_device *pdev; | |
86 | ||
87 | void __iomem *base; | |
88 | unsigned long version; | |
89 | ||
90 | /* a list of queues so we can dispatch IRQs */ | |
91 | spinlock_t lock; | |
92 | struct list_head virtqueues; | |
93 | }; | |
94 | ||
95 | struct virtio_mmio_vq_info { | |
96 | /* the actual virtqueue */ | |
97 | struct virtqueue *vq; | |
98 | ||
edfd52e6 PM |
99 | /* the list node for the virtqueues list */ |
100 | struct list_head node; | |
101 | }; | |
102 | ||
103 | ||
104 | ||
105 | /* Configuration interface */ | |
106 | ||
d0254773 | 107 | static u64 vm_get_features(struct virtio_device *vdev) |
edfd52e6 PM |
108 | { |
109 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
1862ee22 PM |
110 | u64 features; |
111 | ||
112 | writel(1, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL); | |
113 | features = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES); | |
114 | features <<= 32; | |
edfd52e6 | 115 | |
1862ee22 PM |
116 | writel(0, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL); |
117 | features |= readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES); | |
edfd52e6 | 118 | |
1862ee22 | 119 | return features; |
edfd52e6 PM |
120 | } |
121 | ||
5c609a5e | 122 | static int vm_finalize_features(struct virtio_device *vdev) |
edfd52e6 PM |
123 | { |
124 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
edfd52e6 PM |
125 | |
126 | /* Give virtio_ring a chance to accept features. */ | |
127 | vring_transport_features(vdev); | |
128 | ||
0c4aeb4b | 129 | /* Make sure there are no mixed devices */ |
1862ee22 PM |
130 | if (vm_dev->version == 2 && |
131 | !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { | |
132 | dev_err(&vdev->dev, "New virtio-mmio devices (version 2) must provide VIRTIO_F_VERSION_1 feature!\n"); | |
133 | return -EINVAL; | |
134 | } | |
135 | ||
136 | writel(1, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL); | |
137 | writel((u32)(vdev->features >> 32), | |
138 | vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES); | |
93d389f8 | 139 | |
1862ee22 PM |
140 | writel(0, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL); |
141 | writel((u32)vdev->features, | |
142 | vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES); | |
5c609a5e MT |
143 | |
144 | return 0; | |
edfd52e6 PM |
145 | } |
146 | ||
31532340 ST |
147 | static void vm_get(struct virtio_device *vdev, unsigned int offset, |
148 | void *buf, unsigned int len) | |
edfd52e6 PM |
149 | { |
150 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
704a0b5f MT |
151 | void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG; |
152 | u8 b; | |
153 | __le16 w; | |
154 | __le32 l; | |
155 | ||
156 | if (vm_dev->version == 1) { | |
157 | u8 *ptr = buf; | |
158 | int i; | |
159 | ||
160 | for (i = 0; i < len; i++) | |
161 | ptr[i] = readb(base + offset + i); | |
162 | return; | |
163 | } | |
edfd52e6 | 164 | |
704a0b5f MT |
165 | switch (len) { |
166 | case 1: | |
167 | b = readb(base + offset); | |
168 | memcpy(buf, &b, sizeof b); | |
169 | break; | |
170 | case 2: | |
171 | w = cpu_to_le16(readw(base + offset)); | |
172 | memcpy(buf, &w, sizeof w); | |
173 | break; | |
174 | case 4: | |
175 | l = cpu_to_le32(readl(base + offset)); | |
176 | memcpy(buf, &l, sizeof l); | |
177 | break; | |
178 | case 8: | |
179 | l = cpu_to_le32(readl(base + offset)); | |
180 | memcpy(buf, &l, sizeof l); | |
181 | l = cpu_to_le32(ioread32(base + offset + sizeof l)); | |
182 | memcpy(buf + sizeof l, &l, sizeof l); | |
183 | break; | |
184 | default: | |
185 | BUG(); | |
186 | } | |
edfd52e6 PM |
187 | } |
188 | ||
31532340 ST |
189 | static void vm_set(struct virtio_device *vdev, unsigned int offset, |
190 | const void *buf, unsigned int len) | |
edfd52e6 PM |
191 | { |
192 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
704a0b5f MT |
193 | void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG; |
194 | u8 b; | |
195 | __le16 w; | |
196 | __le32 l; | |
197 | ||
198 | if (vm_dev->version == 1) { | |
199 | const u8 *ptr = buf; | |
200 | int i; | |
201 | ||
202 | for (i = 0; i < len; i++) | |
203 | writeb(ptr[i], base + offset + i); | |
edfd52e6 | 204 | |
704a0b5f MT |
205 | return; |
206 | } | |
207 | ||
208 | switch (len) { | |
209 | case 1: | |
210 | memcpy(&b, buf, sizeof b); | |
211 | writeb(b, base + offset); | |
212 | break; | |
213 | case 2: | |
214 | memcpy(&w, buf, sizeof w); | |
215 | writew(le16_to_cpu(w), base + offset); | |
216 | break; | |
217 | case 4: | |
218 | memcpy(&l, buf, sizeof l); | |
219 | writel(le32_to_cpu(l), base + offset); | |
220 | break; | |
221 | case 8: | |
222 | memcpy(&l, buf, sizeof l); | |
223 | writel(le32_to_cpu(l), base + offset); | |
224 | memcpy(&l, buf + sizeof l, sizeof l); | |
225 | writel(le32_to_cpu(l), base + offset + sizeof l); | |
226 | break; | |
227 | default: | |
228 | BUG(); | |
229 | } | |
edfd52e6 PM |
230 | } |
231 | ||
87e7bf14 MT |
232 | static u32 vm_generation(struct virtio_device *vdev) |
233 | { | |
234 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
235 | ||
236 | if (vm_dev->version == 1) | |
237 | return 0; | |
238 | else | |
239 | return readl(vm_dev->base + VIRTIO_MMIO_CONFIG_GENERATION); | |
240 | } | |
241 | ||
edfd52e6 PM |
242 | static u8 vm_get_status(struct virtio_device *vdev) |
243 | { | |
244 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
245 | ||
246 | return readl(vm_dev->base + VIRTIO_MMIO_STATUS) & 0xff; | |
247 | } | |
248 | ||
249 | static void vm_set_status(struct virtio_device *vdev, u8 status) | |
250 | { | |
251 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
252 | ||
253 | /* We should never be setting status to 0. */ | |
254 | BUG_ON(status == 0); | |
255 | ||
8b4ec69d JW |
256 | /* |
257 | * Per memory-barriers.txt, wmb() is not needed to guarantee | |
258 | * that the the cache coherent memory writes have completed | |
259 | * before writing to the MMIO region. | |
260 | */ | |
edfd52e6 PM |
261 | writel(status, vm_dev->base + VIRTIO_MMIO_STATUS); |
262 | } | |
263 | ||
264 | static void vm_reset(struct virtio_device *vdev) | |
265 | { | |
266 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
267 | ||
268 | /* 0 status means a reset. */ | |
269 | writel(0, vm_dev->base + VIRTIO_MMIO_STATUS); | |
270 | } | |
271 | ||
272 | ||
273 | ||
274 | /* Transport interface */ | |
275 | ||
276 | /* the notify function used when creating a virt queue */ | |
46f9c2b9 | 277 | static bool vm_notify(struct virtqueue *vq) |
edfd52e6 PM |
278 | { |
279 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); | |
edfd52e6 PM |
280 | |
281 | /* We write the queue's selector into the notification register to | |
282 | * signal the other end */ | |
06ca287d | 283 | writel(vq->index, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY); |
46f9c2b9 | 284 | return true; |
edfd52e6 PM |
285 | } |
286 | ||
287 | /* Notify all virtqueues on an interrupt. */ | |
288 | static irqreturn_t vm_interrupt(int irq, void *opaque) | |
289 | { | |
290 | struct virtio_mmio_device *vm_dev = opaque; | |
291 | struct virtio_mmio_vq_info *info; | |
edfd52e6 PM |
292 | unsigned long status; |
293 | unsigned long flags; | |
294 | irqreturn_t ret = IRQ_NONE; | |
295 | ||
296 | /* Read and acknowledge interrupts */ | |
297 | status = readl(vm_dev->base + VIRTIO_MMIO_INTERRUPT_STATUS); | |
298 | writel(status, vm_dev->base + VIRTIO_MMIO_INTERRUPT_ACK); | |
299 | ||
016c98c6 MT |
300 | if (unlikely(status & VIRTIO_MMIO_INT_CONFIG)) { |
301 | virtio_config_changed(&vm_dev->vdev); | |
edfd52e6 PM |
302 | ret = IRQ_HANDLED; |
303 | } | |
304 | ||
305 | if (likely(status & VIRTIO_MMIO_INT_VRING)) { | |
306 | spin_lock_irqsave(&vm_dev->lock, flags); | |
307 | list_for_each_entry(info, &vm_dev->virtqueues, node) | |
308 | ret |= vring_interrupt(irq, info->vq); | |
309 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
310 | } | |
311 | ||
312 | return ret; | |
313 | } | |
314 | ||
315 | ||
316 | ||
317 | static void vm_del_vq(struct virtqueue *vq) | |
318 | { | |
319 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); | |
320 | struct virtio_mmio_vq_info *info = vq->priv; | |
b4211138 | 321 | unsigned long flags; |
06ca287d | 322 | unsigned int index = vq->index; |
edfd52e6 PM |
323 | |
324 | spin_lock_irqsave(&vm_dev->lock, flags); | |
325 | list_del(&info->node); | |
326 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
327 | ||
edfd52e6 | 328 | /* Select and deactivate the queue */ |
17bb6d40 | 329 | writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); |
1862ee22 PM |
330 | if (vm_dev->version == 1) { |
331 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); | |
332 | } else { | |
333 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
334 | WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY)); | |
335 | } | |
edfd52e6 | 336 | |
b4211138 AL |
337 | vring_del_virtqueue(vq); |
338 | ||
edfd52e6 PM |
339 | kfree(info); |
340 | } | |
341 | ||
342 | static void vm_del_vqs(struct virtio_device *vdev) | |
343 | { | |
344 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
345 | struct virtqueue *vq, *n; | |
346 | ||
347 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) | |
348 | vm_del_vq(vq); | |
349 | ||
350 | free_irq(platform_get_irq(vm_dev->pdev, 0), vm_dev); | |
351 | } | |
352 | ||
9e9b2893 JW |
353 | static void vm_synchronize_cbs(struct virtio_device *vdev) |
354 | { | |
355 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
356 | ||
357 | synchronize_irq(platform_get_irq(vm_dev->pdev, 0)); | |
358 | } | |
359 | ||
31532340 | 360 | static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int index, |
edfd52e6 | 361 | void (*callback)(struct virtqueue *vq), |
f94682dd | 362 | const char *name, bool ctx) |
edfd52e6 PM |
363 | { |
364 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
365 | struct virtio_mmio_vq_info *info; | |
366 | struct virtqueue *vq; | |
b4211138 AL |
367 | unsigned long flags; |
368 | unsigned int num; | |
edfd52e6 PM |
369 | int err; |
370 | ||
6457f126 MT |
371 | if (!name) |
372 | return NULL; | |
373 | ||
edfd52e6 PM |
374 | /* Select the queue we're interested in */ |
375 | writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL); | |
376 | ||
377 | /* Queue shouldn't already be set up. */ | |
1862ee22 PM |
378 | if (readl(vm_dev->base + (vm_dev->version == 1 ? |
379 | VIRTIO_MMIO_QUEUE_PFN : VIRTIO_MMIO_QUEUE_READY))) { | |
edfd52e6 PM |
380 | err = -ENOENT; |
381 | goto error_available; | |
382 | } | |
383 | ||
384 | /* Allocate and fill out our active queue description */ | |
385 | info = kmalloc(sizeof(*info), GFP_KERNEL); | |
386 | if (!info) { | |
387 | err = -ENOMEM; | |
388 | goto error_kmalloc; | |
389 | } | |
edfd52e6 | 390 | |
b4211138 AL |
391 | num = readl(vm_dev->base + VIRTIO_MMIO_QUEUE_NUM_MAX); |
392 | if (num == 0) { | |
d78b519f | 393 | err = -ENOENT; |
b4211138 | 394 | goto error_new_virtqueue; |
edfd52e6 PM |
395 | } |
396 | ||
edfd52e6 | 397 | /* Create the vring */ |
b4211138 | 398 | vq = vring_create_virtqueue(index, num, VIRTIO_MMIO_VRING_ALIGN, vdev, |
f94682dd | 399 | true, true, ctx, vm_notify, callback, name); |
edfd52e6 PM |
400 | if (!vq) { |
401 | err = -ENOMEM; | |
402 | goto error_new_virtqueue; | |
403 | } | |
404 | ||
1862ee22 | 405 | /* Activate the queue */ |
b4211138 | 406 | writel(virtqueue_get_vring_size(vq), vm_dev->base + VIRTIO_MMIO_QUEUE_NUM); |
1862ee22 | 407 | if (vm_dev->version == 1) { |
3fc92a96 SP |
408 | u64 q_pfn = virtqueue_get_desc_addr(vq) >> PAGE_SHIFT; |
409 | ||
410 | /* | |
411 | * virtio-mmio v1 uses a 32bit QUEUE PFN. If we have something | |
412 | * that doesn't fit in 32bit, fail the setup rather than | |
413 | * pretending to be successful. | |
414 | */ | |
415 | if (q_pfn >> 32) { | |
416 | dev_err(&vdev->dev, | |
417 | "platform bug: legacy virtio-mmio must not be used with RAM above 0x%llxGB\n", | |
418 | 0x1ULL << (32 + PAGE_SHIFT - 30)); | |
419 | err = -E2BIG; | |
420 | goto error_bad_pfn; | |
421 | } | |
422 | ||
1862ee22 | 423 | writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_QUEUE_ALIGN); |
3fc92a96 | 424 | writel(q_pfn, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); |
1862ee22 PM |
425 | } else { |
426 | u64 addr; | |
427 | ||
b4211138 | 428 | addr = virtqueue_get_desc_addr(vq); |
1862ee22 PM |
429 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_LOW); |
430 | writel((u32)(addr >> 32), | |
431 | vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_HIGH); | |
432 | ||
b4211138 | 433 | addr = virtqueue_get_avail_addr(vq); |
1862ee22 PM |
434 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_LOW); |
435 | writel((u32)(addr >> 32), | |
436 | vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_HIGH); | |
437 | ||
b4211138 | 438 | addr = virtqueue_get_used_addr(vq); |
1862ee22 PM |
439 | writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_USED_LOW); |
440 | writel((u32)(addr >> 32), | |
441 | vm_dev->base + VIRTIO_MMIO_QUEUE_USED_HIGH); | |
442 | ||
443 | writel(1, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
444 | } | |
445 | ||
edfd52e6 PM |
446 | vq->priv = info; |
447 | info->vq = vq; | |
448 | ||
449 | spin_lock_irqsave(&vm_dev->lock, flags); | |
450 | list_add(&info->node, &vm_dev->virtqueues); | |
451 | spin_unlock_irqrestore(&vm_dev->lock, flags); | |
452 | ||
453 | return vq; | |
454 | ||
3fc92a96 SP |
455 | error_bad_pfn: |
456 | vring_del_virtqueue(vq); | |
edfd52e6 | 457 | error_new_virtqueue: |
1862ee22 PM |
458 | if (vm_dev->version == 1) { |
459 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN); | |
460 | } else { | |
461 | writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY); | |
462 | WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY)); | |
463 | } | |
edfd52e6 PM |
464 | kfree(info); |
465 | error_kmalloc: | |
466 | error_available: | |
467 | return ERR_PTR(err); | |
468 | } | |
469 | ||
31532340 | 470 | static int vm_find_vqs(struct virtio_device *vdev, unsigned int nvqs, |
edfd52e6 PM |
471 | struct virtqueue *vqs[], |
472 | vq_callback_t *callbacks[], | |
fb5e31d9 | 473 | const char * const names[], |
f94682dd | 474 | const bool *ctx, |
fb5e31d9 | 475 | struct irq_affinity *desc) |
edfd52e6 PM |
476 | { |
477 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
5e663f04 | 478 | int irq = platform_get_irq(vm_dev->pdev, 0); |
a229989d | 479 | int i, err, queue_idx = 0; |
edfd52e6 | 480 | |
0c35c674 | 481 | if (irq < 0) |
5e663f04 | 482 | return irq; |
5e663f04 | 483 | |
edfd52e6 PM |
484 | err = request_irq(irq, vm_interrupt, IRQF_SHARED, |
485 | dev_name(&vdev->dev), vm_dev); | |
486 | if (err) | |
487 | return err; | |
488 | ||
489 | for (i = 0; i < nvqs; ++i) { | |
a229989d WW |
490 | if (!names[i]) { |
491 | vqs[i] = NULL; | |
492 | continue; | |
493 | } | |
494 | ||
495 | vqs[i] = vm_setup_vq(vdev, queue_idx++, callbacks[i], names[i], | |
f94682dd | 496 | ctx ? ctx[i] : false); |
edfd52e6 PM |
497 | if (IS_ERR(vqs[i])) { |
498 | vm_del_vqs(vdev); | |
499 | return PTR_ERR(vqs[i]); | |
500 | } | |
501 | } | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
66846048 RJ |
506 | static const char *vm_bus_name(struct virtio_device *vdev) |
507 | { | |
508 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
edfd52e6 | 509 | |
66846048 RJ |
510 | return vm_dev->pdev->name; |
511 | } | |
edfd52e6 | 512 | |
38e89548 SB |
513 | static bool vm_get_shm_region(struct virtio_device *vdev, |
514 | struct virtio_shm_region *region, u8 id) | |
515 | { | |
516 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); | |
517 | u64 len, addr; | |
518 | ||
519 | /* Select the region we're interested in */ | |
520 | writel(id, vm_dev->base + VIRTIO_MMIO_SHM_SEL); | |
521 | ||
522 | /* Read the region size */ | |
523 | len = (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_LEN_LOW); | |
524 | len |= (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_LEN_HIGH) << 32; | |
525 | ||
526 | region->len = len; | |
527 | ||
528 | /* Check if region length is -1. If that's the case, the shared memory | |
529 | * region does not exist and there is no need to proceed further. | |
530 | */ | |
531 | if (len == ~(u64)0) | |
532 | return false; | |
533 | ||
534 | /* Read the region base address */ | |
535 | addr = (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_BASE_LOW); | |
536 | addr |= (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_BASE_HIGH) << 32; | |
537 | ||
538 | region->addr = addr; | |
539 | ||
540 | return true; | |
541 | } | |
542 | ||
93503932 | 543 | static const struct virtio_config_ops virtio_mmio_config_ops = { |
edfd52e6 PM |
544 | .get = vm_get, |
545 | .set = vm_set, | |
87e7bf14 | 546 | .generation = vm_generation, |
edfd52e6 PM |
547 | .get_status = vm_get_status, |
548 | .set_status = vm_set_status, | |
549 | .reset = vm_reset, | |
550 | .find_vqs = vm_find_vqs, | |
551 | .del_vqs = vm_del_vqs, | |
552 | .get_features = vm_get_features, | |
553 | .finalize_features = vm_finalize_features, | |
66846048 | 554 | .bus_name = vm_bus_name, |
38e89548 | 555 | .get_shm_region = vm_get_shm_region, |
9e9b2893 | 556 | .synchronize_cbs = vm_synchronize_cbs, |
edfd52e6 PM |
557 | }; |
558 | ||
559 | ||
7eb781b1 | 560 | static void virtio_mmio_release_dev(struct device *_d) |
561 | { | |
562 | struct virtio_device *vdev = | |
563 | container_of(_d, struct virtio_device, dev); | |
da98b54d | 564 | struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); |
7eb781b1 | 565 | struct platform_device *pdev = vm_dev->pdev; |
566 | ||
567 | devm_kfree(&pdev->dev, vm_dev); | |
568 | } | |
edfd52e6 PM |
569 | |
570 | /* Platform device */ | |
571 | ||
8590dbc7 | 572 | static int virtio_mmio_probe(struct platform_device *pdev) |
edfd52e6 PM |
573 | { |
574 | struct virtio_mmio_device *vm_dev; | |
edfd52e6 | 575 | unsigned long magic; |
f7f6634d | 576 | int rc; |
edfd52e6 | 577 | |
edfd52e6 | 578 | vm_dev = devm_kzalloc(&pdev->dev, sizeof(*vm_dev), GFP_KERNEL); |
c2e90800 MR |
579 | if (!vm_dev) |
580 | return -ENOMEM; | |
edfd52e6 PM |
581 | |
582 | vm_dev->vdev.dev.parent = &pdev->dev; | |
7eb781b1 | 583 | vm_dev->vdev.dev.release = virtio_mmio_release_dev; |
edfd52e6 PM |
584 | vm_dev->vdev.config = &virtio_mmio_config_ops; |
585 | vm_dev->pdev = pdev; | |
586 | INIT_LIST_HEAD(&vm_dev->virtqueues); | |
587 | spin_lock_init(&vm_dev->lock); | |
588 | ||
c64eb62c YL |
589 | vm_dev->base = devm_platform_ioremap_resource(pdev, 0); |
590 | if (IS_ERR(vm_dev->base)) | |
591 | return PTR_ERR(vm_dev->base); | |
edfd52e6 PM |
592 | |
593 | /* Check magic value */ | |
594 | magic = readl(vm_dev->base + VIRTIO_MMIO_MAGIC_VALUE); | |
4ae85370 | 595 | if (magic != ('v' | 'i' << 8 | 'r' << 16 | 't' << 24)) { |
edfd52e6 | 596 | dev_warn(&pdev->dev, "Wrong magic value 0x%08lx!\n", magic); |
c2e90800 | 597 | return -ENODEV; |
edfd52e6 PM |
598 | } |
599 | ||
600 | /* Check device version */ | |
601 | vm_dev->version = readl(vm_dev->base + VIRTIO_MMIO_VERSION); | |
1862ee22 | 602 | if (vm_dev->version < 1 || vm_dev->version > 2) { |
edfd52e6 PM |
603 | dev_err(&pdev->dev, "Version %ld not supported!\n", |
604 | vm_dev->version); | |
c2e90800 | 605 | return -ENXIO; |
edfd52e6 PM |
606 | } |
607 | ||
608 | vm_dev->vdev.id.device = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_ID); | |
1862ee22 PM |
609 | if (vm_dev->vdev.id.device == 0) { |
610 | /* | |
611 | * virtio-mmio device with an ID 0 is a (dummy) placeholder | |
612 | * with no function. End probing now with no error reported. | |
613 | */ | |
c2e90800 | 614 | return -ENODEV; |
1862ee22 | 615 | } |
edfd52e6 PM |
616 | vm_dev->vdev.id.vendor = readl(vm_dev->base + VIRTIO_MMIO_VENDOR_ID); |
617 | ||
f7f6634d | 618 | if (vm_dev->version == 1) { |
1862ee22 | 619 | writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_GUEST_PAGE_SIZE); |
edfd52e6 | 620 | |
f7f6634d RM |
621 | rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)); |
622 | /* | |
623 | * In the legacy case, ensure our coherently-allocated virtio | |
624 | * ring will be at an address expressable as a 32-bit PFN. | |
625 | */ | |
626 | if (!rc) | |
627 | dma_set_coherent_mask(&pdev->dev, | |
628 | DMA_BIT_MASK(32 + PAGE_SHIFT)); | |
629 | } else { | |
630 | rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); | |
631 | } | |
632 | if (rc) | |
633 | rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); | |
634 | if (rc) | |
635 | dev_warn(&pdev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n"); | |
636 | ||
edfd52e6 PM |
637 | platform_set_drvdata(pdev, vm_dev); |
638 | ||
7eb781b1 | 639 | rc = register_virtio_device(&vm_dev->vdev); |
c2e90800 | 640 | if (rc) |
7eb781b1 | 641 | put_device(&vm_dev->vdev.dev); |
c2e90800 | 642 | |
7eb781b1 | 643 | return rc; |
edfd52e6 PM |
644 | } |
645 | ||
8590dbc7 | 646 | static int virtio_mmio_remove(struct platform_device *pdev) |
edfd52e6 PM |
647 | { |
648 | struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev); | |
edfd52e6 PM |
649 | unregister_virtio_device(&vm_dev->vdev); |
650 | ||
651 | return 0; | |
652 | } | |
653 | ||
654 | ||
655 | ||
81a054ce PM |
656 | /* Devices list parameter */ |
657 | ||
658 | #if defined(CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES) | |
659 | ||
660 | static struct device vm_cmdline_parent = { | |
661 | .init_name = "virtio-mmio-cmdline", | |
662 | }; | |
663 | ||
664 | static int vm_cmdline_parent_registered; | |
665 | static int vm_cmdline_id; | |
666 | ||
667 | static int vm_cmdline_set(const char *device, | |
668 | const struct kernel_param *kp) | |
669 | { | |
670 | int err; | |
671 | struct resource resources[2] = {}; | |
672 | char *str; | |
0619eda8 | 673 | long long base, size; |
40f9938c | 674 | unsigned int irq; |
81a054ce PM |
675 | int processed, consumed = 0; |
676 | struct platform_device *pdev; | |
677 | ||
40f9938c PM |
678 | /* Consume "size" part of the command line parameter */ |
679 | size = memparse(device, &str); | |
81a054ce | 680 | |
40f9938c | 681 | /* Get "@<base>:<irq>[:<id>]" chunks */ |
81a054ce | 682 | processed = sscanf(str, "@%lli:%u%n:%d%n", |
40f9938c | 683 | &base, &irq, &consumed, |
81a054ce PM |
684 | &vm_cmdline_id, &consumed); |
685 | ||
40f9938c | 686 | /* |
62ca18a0 | 687 | * sscanf() must process at least 2 chunks; also there |
40f9938c PM |
688 | * must be no extra characters after the last chunk, so |
689 | * str[consumed] must be '\0' | |
690 | */ | |
62ca18a0 | 691 | if (processed < 2 || str[consumed] || irq == 0) |
81a054ce PM |
692 | return -EINVAL; |
693 | ||
40f9938c | 694 | resources[0].flags = IORESOURCE_MEM; |
81a054ce | 695 | resources[0].start = base; |
40f9938c PM |
696 | resources[0].end = base + size - 1; |
697 | ||
698 | resources[1].flags = IORESOURCE_IRQ; | |
699 | resources[1].start = resources[1].end = irq; | |
81a054ce PM |
700 | |
701 | if (!vm_cmdline_parent_registered) { | |
702 | err = device_register(&vm_cmdline_parent); | |
703 | if (err) { | |
704 | pr_err("Failed to register parent device!\n"); | |
705 | return err; | |
706 | } | |
707 | vm_cmdline_parent_registered = 1; | |
708 | } | |
709 | ||
710 | pr_info("Registering device virtio-mmio.%d at 0x%llx-0x%llx, IRQ %d.\n", | |
711 | vm_cmdline_id, | |
712 | (unsigned long long)resources[0].start, | |
713 | (unsigned long long)resources[0].end, | |
714 | (int)resources[1].start); | |
715 | ||
716 | pdev = platform_device_register_resndata(&vm_cmdline_parent, | |
717 | "virtio-mmio", vm_cmdline_id++, | |
718 | resources, ARRAY_SIZE(resources), NULL, 0); | |
81a054ce | 719 | |
c2c9f9bc | 720 | return PTR_ERR_OR_ZERO(pdev); |
81a054ce PM |
721 | } |
722 | ||
723 | static int vm_cmdline_get_device(struct device *dev, void *data) | |
724 | { | |
725 | char *buffer = data; | |
726 | unsigned int len = strlen(buffer); | |
727 | struct platform_device *pdev = to_platform_device(dev); | |
728 | ||
729 | snprintf(buffer + len, PAGE_SIZE - len, "0x%llx@0x%llx:%llu:%d\n", | |
730 | pdev->resource[0].end - pdev->resource[0].start + 1ULL, | |
731 | (unsigned long long)pdev->resource[0].start, | |
732 | (unsigned long long)pdev->resource[1].start, | |
733 | pdev->id); | |
734 | return 0; | |
735 | } | |
736 | ||
737 | static int vm_cmdline_get(char *buffer, const struct kernel_param *kp) | |
738 | { | |
739 | buffer[0] = '\0'; | |
740 | device_for_each_child(&vm_cmdline_parent, buffer, | |
741 | vm_cmdline_get_device); | |
742 | return strlen(buffer) + 1; | |
743 | } | |
744 | ||
9c27847d | 745 | static const struct kernel_param_ops vm_cmdline_param_ops = { |
81a054ce PM |
746 | .set = vm_cmdline_set, |
747 | .get = vm_cmdline_get, | |
748 | }; | |
749 | ||
750 | device_param_cb(device, &vm_cmdline_param_ops, NULL, S_IRUSR); | |
751 | ||
752 | static int vm_unregister_cmdline_device(struct device *dev, | |
753 | void *data) | |
754 | { | |
755 | platform_device_unregister(to_platform_device(dev)); | |
756 | ||
757 | return 0; | |
758 | } | |
759 | ||
760 | static void vm_unregister_cmdline_devices(void) | |
761 | { | |
762 | if (vm_cmdline_parent_registered) { | |
763 | device_for_each_child(&vm_cmdline_parent, NULL, | |
764 | vm_unregister_cmdline_device); | |
765 | device_unregister(&vm_cmdline_parent); | |
766 | vm_cmdline_parent_registered = 0; | |
767 | } | |
768 | } | |
769 | ||
770 | #else | |
771 | ||
772 | static void vm_unregister_cmdline_devices(void) | |
773 | { | |
774 | } | |
775 | ||
776 | #endif | |
777 | ||
edfd52e6 PM |
778 | /* Platform driver */ |
779 | ||
31919140 | 780 | static const struct of_device_id virtio_mmio_match[] = { |
edfd52e6 PM |
781 | { .compatible = "virtio,mmio", }, |
782 | {}, | |
783 | }; | |
784 | MODULE_DEVICE_TABLE(of, virtio_mmio_match); | |
785 | ||
38c4ab8e GG |
786 | #ifdef CONFIG_ACPI |
787 | static const struct acpi_device_id virtio_mmio_acpi_match[] = { | |
788 | { "LNRO0005", }, | |
789 | { } | |
790 | }; | |
791 | MODULE_DEVICE_TABLE(acpi, virtio_mmio_acpi_match); | |
792 | #endif | |
793 | ||
edfd52e6 PM |
794 | static struct platform_driver virtio_mmio_driver = { |
795 | .probe = virtio_mmio_probe, | |
8590dbc7 | 796 | .remove = virtio_mmio_remove, |
edfd52e6 PM |
797 | .driver = { |
798 | .name = "virtio-mmio", | |
edfd52e6 | 799 | .of_match_table = virtio_mmio_match, |
38c4ab8e | 800 | .acpi_match_table = ACPI_PTR(virtio_mmio_acpi_match), |
edfd52e6 PM |
801 | }, |
802 | }; | |
803 | ||
804 | static int __init virtio_mmio_init(void) | |
805 | { | |
806 | return platform_driver_register(&virtio_mmio_driver); | |
807 | } | |
808 | ||
809 | static void __exit virtio_mmio_exit(void) | |
810 | { | |
811 | platform_driver_unregister(&virtio_mmio_driver); | |
81a054ce | 812 | vm_unregister_cmdline_devices(); |
edfd52e6 PM |
813 | } |
814 | ||
815 | module_init(virtio_mmio_init); | |
816 | module_exit(virtio_mmio_exit); | |
817 | ||
818 | MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); | |
819 | MODULE_DESCRIPTION("Platform bus driver for memory mapped virtio devices"); | |
820 | MODULE_LICENSE("GPL"); |