2 * Remote Processor Framework
4 * Copyright (C) 2011 Texas Instruments, Inc.
5 * Copyright (C) 2011 Google, Inc.
7 * Ohad Ben-Cohen <ohad@wizery.com>
8 * Brian Swetland <swetland@google.com>
9 * Mark Grosen <mgrosen@ti.com>
10 * Fernando Guzman Lugo <fernando.lugo@ti.com>
11 * Suman Anna <s-anna@ti.com>
12 * Robert Tivy <rtivy@ti.com>
13 * Armando Uribe De Leon <x0095078@ti.com>
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * version 2 as published by the Free Software Foundation.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
25 #define pr_fmt(fmt) "%s: " fmt, __func__
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/device.h>
30 #include <linux/slab.h>
31 #include <linux/mutex.h>
32 #include <linux/dma-mapping.h>
33 #include <linux/firmware.h>
34 #include <linux/string.h>
35 #include <linux/debugfs.h>
36 #include <linux/remoteproc.h>
37 #include <linux/iommu.h>
38 #include <linux/idr.h>
39 #include <linux/elf.h>
40 #include <linux/crc32.h>
41 #include <linux/virtio_ids.h>
42 #include <linux/virtio_ring.h>
43 #include <asm/byteorder.h>
45 #include "remoteproc_internal.h"
47 static DEFINE_MUTEX(rproc_list_mutex);
48 static LIST_HEAD(rproc_list);
50 typedef int (*rproc_handle_resources_t)(struct rproc *rproc,
51 struct resource_table *table, int len);
52 typedef int (*rproc_handle_resource_t)(struct rproc *rproc,
53 void *, int offset, int avail);
55 /* Unique indices for remoteproc devices */
56 static DEFINE_IDA(rproc_dev_index);
58 static const char * const rproc_crash_names[] = {
59 [RPROC_MMUFAULT] = "mmufault",
60 [RPROC_WATCHDOG] = "watchdog",
61 [RPROC_FATAL_ERROR] = "fatal error",
64 /* translate rproc_crash_type to string */
65 static const char *rproc_crash_to_string(enum rproc_crash_type type)
67 if (type < ARRAY_SIZE(rproc_crash_names))
68 return rproc_crash_names[type];
73 * This is the IOMMU fault handler we register with the IOMMU API
74 * (when relevant; not all remote processors access memory through
77 * IOMMU core will invoke this handler whenever the remote processor
78 * will try to access an unmapped device address.
80 static int rproc_iommu_fault(struct iommu_domain *domain, struct device *dev,
81 unsigned long iova, int flags, void *token)
83 struct rproc *rproc = token;
85 dev_err(dev, "iommu fault: da 0x%lx flags 0x%x\n", iova, flags);
87 rproc_report_crash(rproc, RPROC_MMUFAULT);
90 * Let the iommu core know we're not really handling this fault;
91 * we just used it as a recovery trigger.
96 static int rproc_enable_iommu(struct rproc *rproc)
98 struct iommu_domain *domain;
99 struct device *dev = rproc->dev.parent;
102 if (!rproc->has_iommu) {
103 dev_dbg(dev, "iommu not present\n");
107 domain = iommu_domain_alloc(dev->bus);
109 dev_err(dev, "can't alloc iommu domain\n");
113 iommu_set_fault_handler(domain, rproc_iommu_fault, rproc);
115 ret = iommu_attach_device(domain, dev);
117 dev_err(dev, "can't attach iommu device: %d\n", ret);
121 rproc->domain = domain;
126 iommu_domain_free(domain);
130 static void rproc_disable_iommu(struct rproc *rproc)
132 struct iommu_domain *domain = rproc->domain;
133 struct device *dev = rproc->dev.parent;
138 iommu_detach_device(domain, dev);
139 iommu_domain_free(domain);
143 * rproc_da_to_va() - lookup the kernel virtual address for a remoteproc address
144 * @rproc: handle of a remote processor
145 * @da: remoteproc device address to translate
146 * @len: length of the memory region @da is pointing to
148 * Some remote processors will ask us to allocate them physically contiguous
149 * memory regions (which we call "carveouts"), and map them to specific
150 * device addresses (which are hardcoded in the firmware). They may also have
151 * dedicated memory regions internal to the processors, and use them either
152 * exclusively or alongside carveouts.
154 * They may then ask us to copy objects into specific device addresses (e.g.
155 * code/data sections) or expose us certain symbols in other device address
156 * (e.g. their trace buffer).
158 * This function is a helper function with which we can go over the allocated
159 * carveouts and translate specific device addresses to kernel virtual addresses
160 * so we can access the referenced memory. This function also allows to perform
161 * translations on the internal remoteproc memory regions through a platform
162 * implementation specific da_to_va ops, if present.
164 * The function returns a valid kernel address on success or NULL on failure.
166 * Note: phys_to_virt(iommu_iova_to_phys(rproc->domain, da)) will work too,
167 * but only on kernel direct mapped RAM memory. Instead, we're just using
168 * here the output of the DMA API for the carveouts, which should be more
171 void *rproc_da_to_va(struct rproc *rproc, u64 da, int len)
173 struct rproc_mem_entry *carveout;
176 if (rproc->ops->da_to_va) {
177 ptr = rproc->ops->da_to_va(rproc, da, len);
182 list_for_each_entry(carveout, &rproc->carveouts, node) {
183 int offset = da - carveout->da;
185 /* try next carveout if da is too small */
189 /* try next carveout if da is too large */
190 if (offset + len > carveout->len)
193 ptr = carveout->va + offset;
201 EXPORT_SYMBOL(rproc_da_to_va);
203 int rproc_alloc_vring(struct rproc_vdev *rvdev, int i)
205 struct rproc *rproc = rvdev->rproc;
206 struct device *dev = &rproc->dev;
207 struct rproc_vring *rvring = &rvdev->vring[i];
208 struct fw_rsc_vdev *rsc;
211 int ret, size, notifyid;
213 /* actual size of vring (in bytes) */
214 size = PAGE_ALIGN(vring_size(rvring->len, rvring->align));
217 * Allocate non-cacheable memory for the vring. In the future
218 * this call will also configure the IOMMU for us
220 va = dma_alloc_coherent(dev->parent, size, &dma, GFP_KERNEL);
222 dev_err(dev->parent, "dma_alloc_coherent failed\n");
227 * Assign an rproc-wide unique index for this vring
228 * TODO: assign a notifyid for rvdev updates as well
229 * TODO: support predefined notifyids (via resource table)
231 ret = idr_alloc(&rproc->notifyids, rvring, 0, 0, GFP_KERNEL);
233 dev_err(dev, "idr_alloc failed: %d\n", ret);
234 dma_free_coherent(dev->parent, size, va, dma);
239 /* Potentially bump max_notifyid */
240 if (notifyid > rproc->max_notifyid)
241 rproc->max_notifyid = notifyid;
243 dev_dbg(dev, "vring%d: va %p dma %pad size 0x%x idr %d\n",
244 i, va, &dma, size, notifyid);
248 rvring->notifyid = notifyid;
251 * Let the rproc know the notifyid and da of this vring.
252 * Not all platforms use dma_alloc_coherent to automatically
253 * set up the iommu. In this case the device address (da) will
254 * hold the physical address and not the device address.
256 rsc = (void *)rproc->table_ptr + rvdev->rsc_offset;
257 rsc->vring[i].da = dma;
258 rsc->vring[i].notifyid = notifyid;
263 rproc_parse_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i)
265 struct rproc *rproc = rvdev->rproc;
266 struct device *dev = &rproc->dev;
267 struct fw_rsc_vdev_vring *vring = &rsc->vring[i];
268 struct rproc_vring *rvring = &rvdev->vring[i];
270 dev_dbg(dev, "vdev rsc: vring%d: da 0x%x, qsz %d, align %d\n",
271 i, vring->da, vring->num, vring->align);
273 /* verify queue size and vring alignment are sane */
274 if (!vring->num || !vring->align) {
275 dev_err(dev, "invalid qsz (%d) or alignment (%d)\n",
276 vring->num, vring->align);
280 rvring->len = vring->num;
281 rvring->align = vring->align;
282 rvring->rvdev = rvdev;
287 void rproc_free_vring(struct rproc_vring *rvring)
289 int size = PAGE_ALIGN(vring_size(rvring->len, rvring->align));
290 struct rproc *rproc = rvring->rvdev->rproc;
291 int idx = rvring->rvdev->vring - rvring;
292 struct fw_rsc_vdev *rsc;
294 dma_free_coherent(rproc->dev.parent, size, rvring->va, rvring->dma);
295 idr_remove(&rproc->notifyids, rvring->notifyid);
297 /* reset resource entry info */
298 rsc = (void *)rproc->table_ptr + rvring->rvdev->rsc_offset;
299 rsc->vring[idx].da = 0;
300 rsc->vring[idx].notifyid = -1;
303 static int rproc_vdev_do_probe(struct rproc_subdev *subdev)
305 struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev);
307 return rproc_add_virtio_dev(rvdev, rvdev->id);
310 static void rproc_vdev_do_remove(struct rproc_subdev *subdev)
312 struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev);
314 rproc_remove_virtio_dev(rvdev);
318 * rproc_handle_vdev() - handle a vdev fw resource
319 * @rproc: the remote processor
320 * @rsc: the vring resource descriptor
321 * @avail: size of available data (for sanity checking the image)
323 * This resource entry requests the host to statically register a virtio
324 * device (vdev), and setup everything needed to support it. It contains
325 * everything needed to make it possible: the virtio device id, virtio
326 * device features, vrings information, virtio config space, etc...
328 * Before registering the vdev, the vrings are allocated from non-cacheable
329 * physically contiguous memory. Currently we only support two vrings per
330 * remote processor (temporary limitation). We might also want to consider
331 * doing the vring allocation only later when ->find_vqs() is invoked, and
332 * then release them upon ->del_vqs().
334 * Note: @da is currently not really handled correctly: we dynamically
335 * allocate it using the DMA API, ignoring requested hard coded addresses,
336 * and we don't take care of any required IOMMU programming. This is all
337 * going to be taken care of when the generic iommu-based DMA API will be
338 * merged. Meanwhile, statically-addressed iommu-based firmware images should
339 * use RSC_DEVMEM resource entries to map their required @da to the physical
340 * address of their base CMA region (ouch, hacky!).
342 * Returns 0 on success, or an appropriate error code otherwise
344 static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
345 int offset, int avail)
347 struct device *dev = &rproc->dev;
348 struct rproc_vdev *rvdev;
351 /* make sure resource isn't truncated */
352 if (sizeof(*rsc) + rsc->num_of_vrings * sizeof(struct fw_rsc_vdev_vring)
353 + rsc->config_len > avail) {
354 dev_err(dev, "vdev rsc is truncated\n");
358 /* make sure reserved bytes are zeroes */
359 if (rsc->reserved[0] || rsc->reserved[1]) {
360 dev_err(dev, "vdev rsc has non zero reserved bytes\n");
364 dev_dbg(dev, "vdev rsc: id %d, dfeatures 0x%x, cfg len %d, %d vrings\n",
365 rsc->id, rsc->dfeatures, rsc->config_len, rsc->num_of_vrings);
367 /* we currently support only two vrings per rvdev */
368 if (rsc->num_of_vrings > ARRAY_SIZE(rvdev->vring)) {
369 dev_err(dev, "too many vrings: %d\n", rsc->num_of_vrings);
373 rvdev = kzalloc(sizeof(*rvdev), GFP_KERNEL);
377 kref_init(&rvdev->refcount);
380 rvdev->rproc = rproc;
382 /* parse the vrings */
383 for (i = 0; i < rsc->num_of_vrings; i++) {
384 ret = rproc_parse_vring(rvdev, rsc, i);
389 /* remember the resource offset*/
390 rvdev->rsc_offset = offset;
392 /* allocate the vring resources */
393 for (i = 0; i < rsc->num_of_vrings; i++) {
394 ret = rproc_alloc_vring(rvdev, i);
396 goto unwind_vring_allocations;
399 /* track the rvdevs list reference */
400 kref_get(&rvdev->refcount);
402 list_add_tail(&rvdev->node, &rproc->rvdevs);
404 rproc_add_subdev(rproc, &rvdev->subdev,
405 rproc_vdev_do_probe, rproc_vdev_do_remove);
409 unwind_vring_allocations:
410 for (i--; i >= 0; i--)
411 rproc_free_vring(&rvdev->vring[i]);
417 void rproc_vdev_release(struct kref *ref)
419 struct rproc_vdev *rvdev = container_of(ref, struct rproc_vdev, refcount);
420 struct rproc_vring *rvring;
421 struct rproc *rproc = rvdev->rproc;
424 for (id = 0; id < ARRAY_SIZE(rvdev->vring); id++) {
425 rvring = &rvdev->vring[id];
429 rproc_free_vring(rvring);
432 rproc_remove_subdev(rproc, &rvdev->subdev);
433 list_del(&rvdev->node);
438 * rproc_handle_trace() - handle a shared trace buffer resource
439 * @rproc: the remote processor
440 * @rsc: the trace resource descriptor
441 * @avail: size of available data (for sanity checking the image)
443 * In case the remote processor dumps trace logs into memory,
444 * export it via debugfs.
446 * Currently, the 'da' member of @rsc should contain the device address
447 * where the remote processor is dumping the traces. Later we could also
448 * support dynamically allocating this address using the generic
449 * DMA API (but currently there isn't a use case for that).
451 * Returns 0 on success, or an appropriate error code otherwise
453 static int rproc_handle_trace(struct rproc *rproc, struct fw_rsc_trace *rsc,
454 int offset, int avail)
456 struct rproc_mem_entry *trace;
457 struct device *dev = &rproc->dev;
461 if (sizeof(*rsc) > avail) {
462 dev_err(dev, "trace rsc is truncated\n");
466 /* make sure reserved bytes are zeroes */
468 dev_err(dev, "trace rsc has non zero reserved bytes\n");
472 /* what's the kernel address of this resource ? */
473 ptr = rproc_da_to_va(rproc, rsc->da, rsc->len);
475 dev_err(dev, "erroneous trace resource entry\n");
479 trace = kzalloc(sizeof(*trace), GFP_KERNEL);
483 /* set the trace buffer dma properties */
484 trace->len = rsc->len;
487 /* make sure snprintf always null terminates, even if truncating */
488 snprintf(name, sizeof(name), "trace%d", rproc->num_traces);
490 /* create the debugfs entry */
491 trace->priv = rproc_create_trace_file(name, rproc, trace);
498 list_add_tail(&trace->node, &rproc->traces);
502 dev_dbg(dev, "%s added: va %p, da 0x%x, len 0x%x\n",
503 name, ptr, rsc->da, rsc->len);
509 * rproc_handle_devmem() - handle devmem resource entry
510 * @rproc: remote processor handle
511 * @rsc: the devmem resource entry
512 * @avail: size of available data (for sanity checking the image)
514 * Remote processors commonly need to access certain on-chip peripherals.
516 * Some of these remote processors access memory via an iommu device,
517 * and might require us to configure their iommu before they can access
518 * the on-chip peripherals they need.
520 * This resource entry is a request to map such a peripheral device.
522 * These devmem entries will contain the physical address of the device in
523 * the 'pa' member. If a specific device address is expected, then 'da' will
524 * contain it (currently this is the only use case supported). 'len' will
525 * contain the size of the physical region we need to map.
527 * Currently we just "trust" those devmem entries to contain valid physical
528 * addresses, but this is going to change: we want the implementations to
529 * tell us ranges of physical addresses the firmware is allowed to request,
530 * and not allow firmwares to request access to physical addresses that
531 * are outside those ranges.
533 static int rproc_handle_devmem(struct rproc *rproc, struct fw_rsc_devmem *rsc,
534 int offset, int avail)
536 struct rproc_mem_entry *mapping;
537 struct device *dev = &rproc->dev;
540 /* no point in handling this resource without a valid iommu domain */
544 if (sizeof(*rsc) > avail) {
545 dev_err(dev, "devmem rsc is truncated\n");
549 /* make sure reserved bytes are zeroes */
551 dev_err(dev, "devmem rsc has non zero reserved bytes\n");
555 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
559 ret = iommu_map(rproc->domain, rsc->da, rsc->pa, rsc->len, rsc->flags);
561 dev_err(dev, "failed to map devmem: %d\n", ret);
566 * We'll need this info later when we'll want to unmap everything
567 * (e.g. on shutdown).
569 * We can't trust the remote processor not to change the resource
570 * table, so we must maintain this info independently.
572 mapping->da = rsc->da;
573 mapping->len = rsc->len;
574 list_add_tail(&mapping->node, &rproc->mappings);
576 dev_dbg(dev, "mapped devmem pa 0x%x, da 0x%x, len 0x%x\n",
577 rsc->pa, rsc->da, rsc->len);
587 * rproc_handle_carveout() - handle phys contig memory allocation requests
588 * @rproc: rproc handle
589 * @rsc: the resource entry
590 * @avail: size of available data (for image validation)
592 * This function will handle firmware requests for allocation of physically
593 * contiguous memory regions.
595 * These request entries should come first in the firmware's resource table,
596 * as other firmware entries might request placing other data objects inside
597 * these memory regions (e.g. data/code segments, trace resource entries, ...).
599 * Allocating memory this way helps utilizing the reserved physical memory
600 * (e.g. CMA) more efficiently, and also minimizes the number of TLB entries
601 * needed to map it (in case @rproc is using an IOMMU). Reducing the TLB
602 * pressure is important; it may have a substantial impact on performance.
604 static int rproc_handle_carveout(struct rproc *rproc,
605 struct fw_rsc_carveout *rsc,
606 int offset, int avail)
608 struct rproc_mem_entry *carveout, *mapping;
609 struct device *dev = &rproc->dev;
614 if (sizeof(*rsc) > avail) {
615 dev_err(dev, "carveout rsc is truncated\n");
619 /* make sure reserved bytes are zeroes */
621 dev_err(dev, "carveout rsc has non zero reserved bytes\n");
625 dev_dbg(dev, "carveout rsc: name: %s, da 0x%x, pa 0x%x, len 0x%x, flags 0x%x\n",
626 rsc->name, rsc->da, rsc->pa, rsc->len, rsc->flags);
628 carveout = kzalloc(sizeof(*carveout), GFP_KERNEL);
632 va = dma_alloc_coherent(dev->parent, rsc->len, &dma, GFP_KERNEL);
635 "failed to allocate dma memory: len 0x%x\n", rsc->len);
640 dev_dbg(dev, "carveout va %p, dma %pad, len 0x%x\n",
644 * Ok, this is non-standard.
646 * Sometimes we can't rely on the generic iommu-based DMA API
647 * to dynamically allocate the device address and then set the IOMMU
648 * tables accordingly, because some remote processors might
649 * _require_ us to use hard coded device addresses that their
650 * firmware was compiled with.
652 * In this case, we must use the IOMMU API directly and map
653 * the memory to the device address as expected by the remote
656 * Obviously such remote processor devices should not be configured
657 * to use the iommu-based DMA API: we expect 'dma' to contain the
658 * physical address in this case.
661 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
667 ret = iommu_map(rproc->domain, rsc->da, dma, rsc->len,
670 dev_err(dev, "iommu_map failed: %d\n", ret);
675 * We'll need this info later when we'll want to unmap
676 * everything (e.g. on shutdown).
678 * We can't trust the remote processor not to change the
679 * resource table, so we must maintain this info independently.
681 mapping->da = rsc->da;
682 mapping->len = rsc->len;
683 list_add_tail(&mapping->node, &rproc->mappings);
685 dev_dbg(dev, "carveout mapped 0x%x to %pad\n",
690 * Some remote processors might need to know the pa
691 * even though they are behind an IOMMU. E.g., OMAP4's
692 * remote M3 processor needs this so it can control
693 * on-chip hardware accelerators that are not behind
694 * the IOMMU, and therefor must know the pa.
696 * Generally we don't want to expose physical addresses
697 * if we don't have to (remote processors are generally
698 * _not_ trusted), so we might want to do this only for
699 * remote processor that _must_ have this (e.g. OMAP4's
700 * dual M3 subsystem).
702 * Non-IOMMU processors might also want to have this info.
703 * In this case, the device address and the physical address
709 carveout->len = rsc->len;
711 carveout->da = rsc->da;
713 list_add_tail(&carveout->node, &rproc->carveouts);
720 dma_free_coherent(dev->parent, rsc->len, va, dma);
727 * A lookup table for resource handlers. The indices are defined in
728 * enum fw_resource_type.
730 static rproc_handle_resource_t rproc_loading_handlers[RSC_LAST] = {
731 [RSC_CARVEOUT] = (rproc_handle_resource_t)rproc_handle_carveout,
732 [RSC_DEVMEM] = (rproc_handle_resource_t)rproc_handle_devmem,
733 [RSC_TRACE] = (rproc_handle_resource_t)rproc_handle_trace,
734 [RSC_VDEV] = (rproc_handle_resource_t)rproc_handle_vdev,
737 /* handle firmware resource entries before booting the remote processor */
738 static int rproc_handle_resources(struct rproc *rproc, int len,
739 rproc_handle_resource_t handlers[RSC_LAST])
741 struct device *dev = &rproc->dev;
742 rproc_handle_resource_t handler;
745 for (i = 0; i < rproc->table_ptr->num; i++) {
746 int offset = rproc->table_ptr->offset[i];
747 struct fw_rsc_hdr *hdr = (void *)rproc->table_ptr + offset;
748 int avail = len - offset - sizeof(*hdr);
749 void *rsc = (void *)hdr + sizeof(*hdr);
751 /* make sure table isn't truncated */
753 dev_err(dev, "rsc table is truncated\n");
757 dev_dbg(dev, "rsc: type %d\n", hdr->type);
759 if (hdr->type >= RSC_LAST) {
760 dev_warn(dev, "unsupported resource %d\n", hdr->type);
764 handler = handlers[hdr->type];
768 ret = handler(rproc, rsc, offset + sizeof(*hdr), avail);
776 static int rproc_probe_subdevices(struct rproc *rproc)
778 struct rproc_subdev *subdev;
781 list_for_each_entry(subdev, &rproc->subdevs, node) {
782 ret = subdev->probe(subdev);
784 goto unroll_registration;
790 list_for_each_entry_continue_reverse(subdev, &rproc->subdevs, node)
791 subdev->remove(subdev);
796 static void rproc_remove_subdevices(struct rproc *rproc)
798 struct rproc_subdev *subdev;
800 list_for_each_entry(subdev, &rproc->subdevs, node)
801 subdev->remove(subdev);
805 * rproc_resource_cleanup() - clean up and free all acquired resources
806 * @rproc: rproc handle
808 * This function will free all resources acquired for @rproc, and it
809 * is called whenever @rproc either shuts down or fails to boot.
811 static void rproc_resource_cleanup(struct rproc *rproc)
813 struct rproc_mem_entry *entry, *tmp;
814 struct rproc_vdev *rvdev, *rvtmp;
815 struct device *dev = &rproc->dev;
817 /* clean up debugfs trace entries */
818 list_for_each_entry_safe(entry, tmp, &rproc->traces, node) {
819 rproc_remove_trace_file(entry->priv);
821 list_del(&entry->node);
825 /* clean up iommu mapping entries */
826 list_for_each_entry_safe(entry, tmp, &rproc->mappings, node) {
829 unmapped = iommu_unmap(rproc->domain, entry->da, entry->len);
830 if (unmapped != entry->len) {
831 /* nothing much to do besides complaining */
832 dev_err(dev, "failed to unmap %u/%zu\n", entry->len,
836 list_del(&entry->node);
840 /* clean up carveout allocations */
841 list_for_each_entry_safe(entry, tmp, &rproc->carveouts, node) {
842 dma_free_coherent(dev->parent, entry->len, entry->va,
844 list_del(&entry->node);
848 /* clean up remote vdev entries */
849 list_for_each_entry_safe(rvdev, rvtmp, &rproc->rvdevs, node)
850 kref_put(&rvdev->refcount, rproc_vdev_release);
854 * take a firmware and boot a remote processor with it.
856 static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
858 struct device *dev = &rproc->dev;
859 const char *name = rproc->firmware;
860 struct resource_table *table, *loaded_table;
863 ret = rproc_fw_sanity_check(rproc, fw);
867 dev_info(dev, "Booting fw image %s, size %zd\n", name, fw->size);
870 * if enabling an IOMMU isn't relevant for this rproc, this is
873 ret = rproc_enable_iommu(rproc);
875 dev_err(dev, "can't enable iommu: %d\n", ret);
879 rproc->bootaddr = rproc_get_boot_addr(rproc, fw);
882 /* look for the resource table */
883 table = rproc_find_rsc_table(rproc, fw, &tablesz);
885 dev_err(dev, "Failed to find resource table\n");
890 * Create a copy of the resource table. When a virtio device starts
891 * and calls vring_new_virtqueue() the address of the allocated vring
892 * will be stored in the table_ptr. Before the device is started,
893 * table_ptr will be copied into device memory.
895 rproc->table_ptr = kmemdup(table, tablesz, GFP_KERNEL);
896 if (!rproc->table_ptr)
899 /* reset max_notifyid */
900 rproc->max_notifyid = -1;
902 /* handle fw resources which are required to boot rproc */
903 ret = rproc_handle_resources(rproc, tablesz, rproc_loading_handlers);
905 dev_err(dev, "Failed to process resources: %d\n", ret);
906 goto clean_up_resources;
909 /* load the ELF segments to memory */
910 ret = rproc_load_segments(rproc, fw);
912 dev_err(dev, "Failed to load program segments: %d\n", ret);
913 goto clean_up_resources;
917 * The starting device has been given the rproc->table_ptr as the
918 * resource table. The address of the vring along with the other
919 * allocated resources (carveouts etc) is stored in table_ptr.
920 * In order to pass this information to the remote device we must copy
921 * this information to device memory. We also update the table_ptr so
922 * that any subsequent changes will be applied to the loaded version.
924 loaded_table = rproc_find_loaded_rsc_table(rproc, fw);
926 memcpy(loaded_table, rproc->table_ptr, tablesz);
928 /* power up the remote processor */
929 ret = rproc->ops->start(rproc);
931 dev_err(dev, "can't start rproc %s: %d\n", rproc->name, ret);
932 goto clean_up_resources;
935 /* probe any subdevices for the remote processor */
936 ret = rproc_probe_subdevices(rproc);
938 dev_err(dev, "failed to probe subdevices for %s: %d\n",
943 rproc->state = RPROC_RUNNING;
945 dev_info(dev, "remote processor %s is now up\n", rproc->name);
950 rproc->ops->stop(rproc);
952 rproc_resource_cleanup(rproc);
954 kfree(rproc->table_ptr);
955 rproc->table_ptr = NULL;
957 rproc_disable_iommu(rproc);
962 * take a firmware and look for virtio devices to register.
964 * Note: this function is called asynchronously upon registration of the
965 * remote processor (so we must wait until it completes before we try
966 * to unregister the device. one other option is just to use kref here,
967 * that might be cleaner).
969 static void rproc_fw_config_virtio(const struct firmware *fw, void *context)
971 struct rproc *rproc = context;
973 /* if rproc is marked always-on, request it to boot */
974 if (rproc->auto_boot)
977 release_firmware(fw);
978 /* allow rproc_del() contexts, if any, to proceed */
979 complete_all(&rproc->firmware_loading_complete);
982 static int rproc_add_virtio_devices(struct rproc *rproc)
986 /* rproc_del() calls must wait until async loader completes */
987 init_completion(&rproc->firmware_loading_complete);
990 * We must retrieve early virtio configuration info from
991 * the firmware (e.g. whether to register a virtio device,
992 * what virtio features does it support, ...).
994 * We're initiating an asynchronous firmware loading, so we can
995 * be built-in kernel code, without hanging the boot process.
997 ret = request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG,
998 rproc->firmware, &rproc->dev, GFP_KERNEL,
999 rproc, rproc_fw_config_virtio);
1001 dev_err(&rproc->dev, "request_firmware_nowait err: %d\n", ret);
1002 complete_all(&rproc->firmware_loading_complete);
1009 * rproc_trigger_recovery() - recover a remoteproc
1010 * @rproc: the remote processor
1012 * The recovery is done by resetting all the virtio devices, that way all the
1013 * rpmsg drivers will be reseted along with the remote processor making the
1014 * remoteproc functional again.
1016 * This function can sleep, so it cannot be called from atomic context.
1018 int rproc_trigger_recovery(struct rproc *rproc)
1020 dev_err(&rproc->dev, "recovering %s\n", rproc->name);
1022 init_completion(&rproc->crash_comp);
1024 /* shut down the remote */
1025 /* TODO: make sure this works with rproc->power > 1 */
1026 rproc_shutdown(rproc);
1028 /* wait until there is no more rproc users */
1029 wait_for_completion(&rproc->crash_comp);
1032 * boot the remote processor up again
1040 * rproc_crash_handler_work() - handle a crash
1042 * This function needs to handle everything related to a crash, like cpu
1043 * registers and stack dump, information to help to debug the fatal error, etc.
1045 static void rproc_crash_handler_work(struct work_struct *work)
1047 struct rproc *rproc = container_of(work, struct rproc, crash_handler);
1048 struct device *dev = &rproc->dev;
1050 dev_dbg(dev, "enter %s\n", __func__);
1052 mutex_lock(&rproc->lock);
1054 if (rproc->state == RPROC_CRASHED || rproc->state == RPROC_OFFLINE) {
1055 /* handle only the first crash detected */
1056 mutex_unlock(&rproc->lock);
1060 rproc->state = RPROC_CRASHED;
1061 dev_err(dev, "handling crash #%u in %s\n", ++rproc->crash_cnt,
1064 mutex_unlock(&rproc->lock);
1066 if (!rproc->recovery_disabled)
1067 rproc_trigger_recovery(rproc);
1071 * __rproc_boot() - boot a remote processor
1072 * @rproc: handle of a remote processor
1074 * Boot a remote processor (i.e. load its firmware, power it on, ...).
1076 * If the remote processor is already powered on, this function immediately
1077 * returns (successfully).
1079 * Returns 0 on success, and an appropriate error value otherwise.
1081 static int __rproc_boot(struct rproc *rproc)
1083 const struct firmware *firmware_p;
1088 pr_err("invalid rproc handle\n");
1094 ret = mutex_lock_interruptible(&rproc->lock);
1096 dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret);
1100 /* skip the boot process if rproc is already powered up */
1101 if (atomic_inc_return(&rproc->power) > 1) {
1106 dev_info(dev, "powering up %s\n", rproc->name);
1109 ret = request_firmware(&firmware_p, rproc->firmware, dev);
1111 dev_err(dev, "request_firmware failed: %d\n", ret);
1115 ret = rproc_fw_boot(rproc, firmware_p);
1117 release_firmware(firmware_p);
1121 atomic_dec(&rproc->power);
1123 mutex_unlock(&rproc->lock);
1128 * rproc_boot() - boot a remote processor
1129 * @rproc: handle of a remote processor
1131 int rproc_boot(struct rproc *rproc)
1133 return __rproc_boot(rproc);
1135 EXPORT_SYMBOL(rproc_boot);
1138 * rproc_shutdown() - power off the remote processor
1139 * @rproc: the remote processor
1141 * Power off a remote processor (previously booted with rproc_boot()).
1143 * In case @rproc is still being used by an additional user(s), then
1144 * this function will just decrement the power refcount and exit,
1145 * without really powering off the device.
1147 * Every call to rproc_boot() must (eventually) be accompanied by a call
1148 * to rproc_shutdown(). Calling rproc_shutdown() redundantly is a bug.
1151 * - we're not decrementing the rproc's refcount, only the power refcount.
1152 * which means that the @rproc handle stays valid even after rproc_shutdown()
1153 * returns, and users can still use it with a subsequent rproc_boot(), if
1156 void rproc_shutdown(struct rproc *rproc)
1158 struct device *dev = &rproc->dev;
1161 ret = mutex_lock_interruptible(&rproc->lock);
1163 dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret);
1167 /* if the remote proc is still needed, bail out */
1168 if (!atomic_dec_and_test(&rproc->power))
1171 /* remove any subdevices for the remote processor */
1172 rproc_remove_subdevices(rproc);
1174 /* power off the remote processor */
1175 ret = rproc->ops->stop(rproc);
1177 atomic_inc(&rproc->power);
1178 dev_err(dev, "can't stop rproc: %d\n", ret);
1182 /* clean up all acquired resources */
1183 rproc_resource_cleanup(rproc);
1185 rproc_disable_iommu(rproc);
1187 /* Free the copy of the resource table */
1188 kfree(rproc->table_ptr);
1189 rproc->table_ptr = NULL;
1191 /* if in crash state, unlock crash handler */
1192 if (rproc->state == RPROC_CRASHED)
1193 complete_all(&rproc->crash_comp);
1195 rproc->state = RPROC_OFFLINE;
1197 dev_info(dev, "stopped remote processor %s\n", rproc->name);
1200 mutex_unlock(&rproc->lock);
1202 EXPORT_SYMBOL(rproc_shutdown);
1205 * rproc_get_by_phandle() - find a remote processor by phandle
1206 * @phandle: phandle to the rproc
1208 * Finds an rproc handle using the remote processor's phandle, and then
1209 * return a handle to the rproc.
1211 * This function increments the remote processor's refcount, so always
1212 * use rproc_put() to decrement it back once rproc isn't needed anymore.
1214 * Returns the rproc handle on success, and NULL on failure.
1217 struct rproc *rproc_get_by_phandle(phandle phandle)
1219 struct rproc *rproc = NULL, *r;
1220 struct device_node *np;
1222 np = of_find_node_by_phandle(phandle);
1226 mutex_lock(&rproc_list_mutex);
1227 list_for_each_entry(r, &rproc_list, node) {
1228 if (r->dev.parent && r->dev.parent->of_node == np) {
1229 /* prevent underlying implementation from being removed */
1230 if (!try_module_get(r->dev.parent->driver->owner)) {
1231 dev_err(&r->dev, "can't get owner\n");
1236 get_device(&rproc->dev);
1240 mutex_unlock(&rproc_list_mutex);
1247 struct rproc *rproc_get_by_phandle(phandle phandle)
1252 EXPORT_SYMBOL(rproc_get_by_phandle);
1255 * rproc_add() - register a remote processor
1256 * @rproc: the remote processor handle to register
1258 * Registers @rproc with the remoteproc framework, after it has been
1259 * allocated with rproc_alloc().
1261 * This is called by the platform-specific rproc implementation, whenever
1262 * a new remote processor device is probed.
1264 * Returns 0 on success and an appropriate error code otherwise.
1266 * Note: this function initiates an asynchronous firmware loading
1267 * context, which will look for virtio devices supported by the rproc's
1270 * If found, those virtio devices will be created and added, so as a result
1271 * of registering this remote processor, additional virtio drivers might be
1274 int rproc_add(struct rproc *rproc)
1276 struct device *dev = &rproc->dev;
1279 ret = device_add(dev);
1283 dev_info(dev, "%s is available\n", rproc->name);
1285 /* create debugfs entries */
1286 rproc_create_debug_dir(rproc);
1287 ret = rproc_add_virtio_devices(rproc);
1291 /* expose to rproc_get_by_phandle users */
1292 mutex_lock(&rproc_list_mutex);
1293 list_add(&rproc->node, &rproc_list);
1294 mutex_unlock(&rproc_list_mutex);
1298 EXPORT_SYMBOL(rproc_add);
1301 * rproc_type_release() - release a remote processor instance
1302 * @dev: the rproc's device
1304 * This function should _never_ be called directly.
1306 * It will be called by the driver core when no one holds a valid pointer
1309 static void rproc_type_release(struct device *dev)
1311 struct rproc *rproc = container_of(dev, struct rproc, dev);
1313 dev_info(&rproc->dev, "releasing %s\n", rproc->name);
1315 rproc_delete_debug_dir(rproc);
1317 idr_destroy(&rproc->notifyids);
1319 if (rproc->index >= 0)
1320 ida_simple_remove(&rproc_dev_index, rproc->index);
1322 kfree(rproc->firmware);
1326 static struct device_type rproc_type = {
1327 .name = "remoteproc",
1328 .release = rproc_type_release,
1332 * rproc_alloc() - allocate a remote processor handle
1333 * @dev: the underlying device
1334 * @name: name of this remote processor
1335 * @ops: platform-specific handlers (mainly start/stop)
1336 * @firmware: name of firmware file to load, can be NULL
1337 * @len: length of private data needed by the rproc driver (in bytes)
1339 * Allocates a new remote processor handle, but does not register
1340 * it yet. if @firmware is NULL, a default name is used.
1342 * This function should be used by rproc implementations during initialization
1343 * of the remote processor.
1345 * After creating an rproc handle using this function, and when ready,
1346 * implementations should then call rproc_add() to complete
1347 * the registration of the remote processor.
1349 * On success the new rproc is returned, and on failure, NULL.
1351 * Note: _never_ directly deallocate @rproc, even if it was not registered
1352 * yet. Instead, when you need to unroll rproc_alloc(), use rproc_free().
1354 struct rproc *rproc_alloc(struct device *dev, const char *name,
1355 const struct rproc_ops *ops,
1356 const char *firmware, int len)
1358 struct rproc *rproc;
1359 char *p, *template = "rproc-%s-fw";
1362 if (!dev || !name || !ops)
1367 * If the caller didn't pass in a firmware name then
1368 * construct a default name.
1370 name_len = strlen(name) + strlen(template) - 2 + 1;
1371 p = kmalloc(name_len, GFP_KERNEL);
1374 snprintf(p, name_len, template, name);
1376 p = kstrdup(firmware, GFP_KERNEL);
1381 rproc = kzalloc(sizeof(struct rproc) + len, GFP_KERNEL);
1387 rproc->firmware = p;
1390 rproc->priv = &rproc[1];
1391 rproc->auto_boot = true;
1393 device_initialize(&rproc->dev);
1394 rproc->dev.parent = dev;
1395 rproc->dev.type = &rproc_type;
1396 rproc->dev.class = &rproc_class;
1398 /* Assign a unique device index and name */
1399 rproc->index = ida_simple_get(&rproc_dev_index, 0, 0, GFP_KERNEL);
1400 if (rproc->index < 0) {
1401 dev_err(dev, "ida_simple_get failed: %d\n", rproc->index);
1402 put_device(&rproc->dev);
1406 dev_set_name(&rproc->dev, "remoteproc%d", rproc->index);
1408 atomic_set(&rproc->power, 0);
1410 /* Set ELF as the default fw_ops handler */
1411 rproc->fw_ops = &rproc_elf_fw_ops;
1413 mutex_init(&rproc->lock);
1415 idr_init(&rproc->notifyids);
1417 INIT_LIST_HEAD(&rproc->carveouts);
1418 INIT_LIST_HEAD(&rproc->mappings);
1419 INIT_LIST_HEAD(&rproc->traces);
1420 INIT_LIST_HEAD(&rproc->rvdevs);
1421 INIT_LIST_HEAD(&rproc->subdevs);
1423 INIT_WORK(&rproc->crash_handler, rproc_crash_handler_work);
1424 init_completion(&rproc->crash_comp);
1426 rproc->state = RPROC_OFFLINE;
1430 EXPORT_SYMBOL(rproc_alloc);
1433 * rproc_free() - unroll rproc_alloc()
1434 * @rproc: the remote processor handle
1436 * This function decrements the rproc dev refcount.
1438 * If no one holds any reference to rproc anymore, then its refcount would
1439 * now drop to zero, and it would be freed.
1441 void rproc_free(struct rproc *rproc)
1443 put_device(&rproc->dev);
1445 EXPORT_SYMBOL(rproc_free);
1448 * rproc_put() - release rproc reference
1449 * @rproc: the remote processor handle
1451 * This function decrements the rproc dev refcount.
1453 * If no one holds any reference to rproc anymore, then its refcount would
1454 * now drop to zero, and it would be freed.
1456 void rproc_put(struct rproc *rproc)
1458 module_put(rproc->dev.parent->driver->owner);
1459 put_device(&rproc->dev);
1461 EXPORT_SYMBOL(rproc_put);
1464 * rproc_del() - unregister a remote processor
1465 * @rproc: rproc handle to unregister
1467 * This function should be called when the platform specific rproc
1468 * implementation decides to remove the rproc device. it should
1469 * _only_ be called if a previous invocation of rproc_add()
1470 * has completed successfully.
1472 * After rproc_del() returns, @rproc isn't freed yet, because
1473 * of the outstanding reference created by rproc_alloc. To decrement that
1474 * one last refcount, one still needs to call rproc_free().
1476 * Returns 0 on success and -EINVAL if @rproc isn't valid.
1478 int rproc_del(struct rproc *rproc)
1483 /* if rproc is just being registered, wait */
1484 wait_for_completion(&rproc->firmware_loading_complete);
1486 /* if rproc is marked always-on, rproc_add() booted it */
1487 /* TODO: make sure this works with rproc->power > 1 */
1488 if (rproc->auto_boot)
1489 rproc_shutdown(rproc);
1491 /* the rproc is downref'ed as soon as it's removed from the klist */
1492 mutex_lock(&rproc_list_mutex);
1493 list_del(&rproc->node);
1494 mutex_unlock(&rproc_list_mutex);
1496 device_del(&rproc->dev);
1500 EXPORT_SYMBOL(rproc_del);
1503 * rproc_add_subdev() - add a subdevice to a remoteproc
1504 * @rproc: rproc handle to add the subdevice to
1505 * @subdev: subdev handle to register
1506 * @probe: function to call when the rproc boots
1507 * @remove: function to call when the rproc shuts down
1509 void rproc_add_subdev(struct rproc *rproc,
1510 struct rproc_subdev *subdev,
1511 int (*probe)(struct rproc_subdev *subdev),
1512 void (*remove)(struct rproc_subdev *subdev))
1514 subdev->probe = probe;
1515 subdev->remove = remove;
1517 list_add_tail(&subdev->node, &rproc->subdevs);
1519 EXPORT_SYMBOL(rproc_add_subdev);
1522 * rproc_remove_subdev() - remove a subdevice from a remoteproc
1523 * @rproc: rproc handle to remove the subdevice from
1524 * @subdev: subdev handle, previously registered with rproc_add_subdev()
1526 void rproc_remove_subdev(struct rproc *rproc, struct rproc_subdev *subdev)
1528 list_del(&subdev->node);
1530 EXPORT_SYMBOL(rproc_remove_subdev);
1533 * rproc_report_crash() - rproc crash reporter function
1534 * @rproc: remote processor
1537 * This function must be called every time a crash is detected by the low-level
1538 * drivers implementing a specific remoteproc. This should not be called from a
1539 * non-remoteproc driver.
1541 * This function can be called from atomic/interrupt context.
1543 void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type)
1546 pr_err("NULL rproc pointer\n");
1550 dev_err(&rproc->dev, "crash detected in %s: type %s\n",
1551 rproc->name, rproc_crash_to_string(type));
1553 /* create a new task to handle the error */
1554 schedule_work(&rproc->crash_handler);
1556 EXPORT_SYMBOL(rproc_report_crash);
1558 static int __init remoteproc_init(void)
1561 rproc_init_debugfs();
1565 module_init(remoteproc_init);
1567 static void __exit remoteproc_exit(void)
1569 ida_destroy(&rproc_dev_index);
1571 rproc_exit_debugfs();
1574 module_exit(remoteproc_exit);
1576 MODULE_LICENSE("GPL v2");
1577 MODULE_DESCRIPTION("Generic Remote Processor Framework");