forked from Minki/linux
d2e12e66a9
rproc_add adds the newly created remoteproc to a list for use by
rproc_get_by_phandle and then does some additional processing to finish
adding the remoteproc. This leaves a small window of time in which the
rproc is available in the list but not yet fully initialized, so if
another driver comes along and gets a handle to the rproc, it will be
invalid. Rearrange the code in rproc_add to make sure the rproc is added
to the list only after it has been successfuly initialized.
Fixes: fec47d8635
("remoteproc: introduce rproc_get_by_phandle API")
Cc: stable@vger.kernel.org
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
1517 lines
41 KiB
C
1517 lines
41 KiB
C
/*
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* Remote Processor Framework
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*
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* Copyright (C) 2011 Texas Instruments, Inc.
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* Copyright (C) 2011 Google, Inc.
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*
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* Ohad Ben-Cohen <ohad@wizery.com>
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* Brian Swetland <swetland@google.com>
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* Mark Grosen <mgrosen@ti.com>
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* Fernando Guzman Lugo <fernando.lugo@ti.com>
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* Suman Anna <s-anna@ti.com>
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* Robert Tivy <rtivy@ti.com>
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* Armando Uribe De Leon <x0095078@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define pr_fmt(fmt) "%s: " fmt, __func__
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/dma-mapping.h>
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#include <linux/firmware.h>
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#include <linux/string.h>
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#include <linux/debugfs.h>
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#include <linux/remoteproc.h>
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#include <linux/iommu.h>
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#include <linux/idr.h>
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#include <linux/elf.h>
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#include <linux/crc32.h>
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#include <linux/virtio_ids.h>
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#include <linux/virtio_ring.h>
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#include <asm/byteorder.h>
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#include "remoteproc_internal.h"
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static DEFINE_MUTEX(rproc_list_mutex);
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static LIST_HEAD(rproc_list);
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typedef int (*rproc_handle_resources_t)(struct rproc *rproc,
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struct resource_table *table, int len);
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typedef int (*rproc_handle_resource_t)(struct rproc *rproc,
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void *, int offset, int avail);
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/* Unique indices for remoteproc devices */
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static DEFINE_IDA(rproc_dev_index);
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static const char * const rproc_crash_names[] = {
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[RPROC_MMUFAULT] = "mmufault",
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[RPROC_WATCHDOG] = "watchdog",
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[RPROC_FATAL_ERROR] = "fatal error",
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};
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/* translate rproc_crash_type to string */
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static const char *rproc_crash_to_string(enum rproc_crash_type type)
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{
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if (type < ARRAY_SIZE(rproc_crash_names))
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return rproc_crash_names[type];
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return "unknown";
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}
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/*
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* This is the IOMMU fault handler we register with the IOMMU API
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* (when relevant; not all remote processors access memory through
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* an IOMMU).
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*
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* IOMMU core will invoke this handler whenever the remote processor
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* will try to access an unmapped device address.
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*/
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static int rproc_iommu_fault(struct iommu_domain *domain, struct device *dev,
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unsigned long iova, int flags, void *token)
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{
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struct rproc *rproc = token;
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dev_err(dev, "iommu fault: da 0x%lx flags 0x%x\n", iova, flags);
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rproc_report_crash(rproc, RPROC_MMUFAULT);
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/*
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* Let the iommu core know we're not really handling this fault;
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* we just used it as a recovery trigger.
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*/
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return -ENOSYS;
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}
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static int rproc_enable_iommu(struct rproc *rproc)
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{
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struct iommu_domain *domain;
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struct device *dev = rproc->dev.parent;
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int ret;
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if (!rproc->has_iommu) {
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dev_dbg(dev, "iommu not present\n");
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return 0;
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}
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domain = iommu_domain_alloc(dev->bus);
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if (!domain) {
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dev_err(dev, "can't alloc iommu domain\n");
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return -ENOMEM;
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}
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iommu_set_fault_handler(domain, rproc_iommu_fault, rproc);
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ret = iommu_attach_device(domain, dev);
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if (ret) {
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dev_err(dev, "can't attach iommu device: %d\n", ret);
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goto free_domain;
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}
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rproc->domain = domain;
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return 0;
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free_domain:
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iommu_domain_free(domain);
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return ret;
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}
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static void rproc_disable_iommu(struct rproc *rproc)
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{
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struct iommu_domain *domain = rproc->domain;
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struct device *dev = rproc->dev.parent;
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if (!domain)
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return;
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iommu_detach_device(domain, dev);
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iommu_domain_free(domain);
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}
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/**
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* rproc_da_to_va() - lookup the kernel virtual address for a remoteproc address
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* @rproc: handle of a remote processor
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* @da: remoteproc device address to translate
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* @len: length of the memory region @da is pointing to
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*
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* Some remote processors will ask us to allocate them physically contiguous
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* memory regions (which we call "carveouts"), and map them to specific
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* device addresses (which are hardcoded in the firmware). They may also have
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* dedicated memory regions internal to the processors, and use them either
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* exclusively or alongside carveouts.
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*
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* They may then ask us to copy objects into specific device addresses (e.g.
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* code/data sections) or expose us certain symbols in other device address
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* (e.g. their trace buffer).
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*
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* This function is a helper function with which we can go over the allocated
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* carveouts and translate specific device addresses to kernel virtual addresses
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* so we can access the referenced memory. This function also allows to perform
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* translations on the internal remoteproc memory regions through a platform
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* implementation specific da_to_va ops, if present.
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*
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* The function returns a valid kernel address on success or NULL on failure.
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*
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* Note: phys_to_virt(iommu_iova_to_phys(rproc->domain, da)) will work too,
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* but only on kernel direct mapped RAM memory. Instead, we're just using
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* here the output of the DMA API for the carveouts, which should be more
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* correct.
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*/
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void *rproc_da_to_va(struct rproc *rproc, u64 da, int len)
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{
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struct rproc_mem_entry *carveout;
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void *ptr = NULL;
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if (rproc->ops->da_to_va) {
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ptr = rproc->ops->da_to_va(rproc, da, len);
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if (ptr)
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goto out;
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}
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list_for_each_entry(carveout, &rproc->carveouts, node) {
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int offset = da - carveout->da;
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/* try next carveout if da is too small */
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if (offset < 0)
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continue;
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/* try next carveout if da is too large */
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if (offset + len > carveout->len)
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continue;
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ptr = carveout->va + offset;
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break;
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}
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out:
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return ptr;
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}
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EXPORT_SYMBOL(rproc_da_to_va);
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int rproc_alloc_vring(struct rproc_vdev *rvdev, int i)
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{
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struct rproc *rproc = rvdev->rproc;
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struct device *dev = &rproc->dev;
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struct rproc_vring *rvring = &rvdev->vring[i];
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struct fw_rsc_vdev *rsc;
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dma_addr_t dma;
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void *va;
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int ret, size, notifyid;
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/* actual size of vring (in bytes) */
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size = PAGE_ALIGN(vring_size(rvring->len, rvring->align));
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/*
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* Allocate non-cacheable memory for the vring. In the future
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* this call will also configure the IOMMU for us
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*/
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va = dma_alloc_coherent(dev->parent, size, &dma, GFP_KERNEL);
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if (!va) {
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dev_err(dev->parent, "dma_alloc_coherent failed\n");
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return -EINVAL;
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}
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/*
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* Assign an rproc-wide unique index for this vring
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* TODO: assign a notifyid for rvdev updates as well
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* TODO: support predefined notifyids (via resource table)
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*/
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ret = idr_alloc(&rproc->notifyids, rvring, 0, 0, GFP_KERNEL);
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if (ret < 0) {
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dev_err(dev, "idr_alloc failed: %d\n", ret);
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dma_free_coherent(dev->parent, size, va, dma);
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return ret;
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}
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notifyid = ret;
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dev_dbg(dev, "vring%d: va %p dma %llx size %x idr %d\n", i, va,
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(unsigned long long)dma, size, notifyid);
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rvring->va = va;
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rvring->dma = dma;
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rvring->notifyid = notifyid;
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/*
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* Let the rproc know the notifyid and da of this vring.
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* Not all platforms use dma_alloc_coherent to automatically
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* set up the iommu. In this case the device address (da) will
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* hold the physical address and not the device address.
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*/
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rsc = (void *)rproc->table_ptr + rvdev->rsc_offset;
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rsc->vring[i].da = dma;
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rsc->vring[i].notifyid = notifyid;
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return 0;
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}
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static int
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rproc_parse_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i)
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{
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struct rproc *rproc = rvdev->rproc;
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struct device *dev = &rproc->dev;
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struct fw_rsc_vdev_vring *vring = &rsc->vring[i];
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struct rproc_vring *rvring = &rvdev->vring[i];
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dev_dbg(dev, "vdev rsc: vring%d: da %x, qsz %d, align %d\n",
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i, vring->da, vring->num, vring->align);
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/* make sure reserved bytes are zeroes */
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if (vring->reserved) {
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dev_err(dev, "vring rsc has non zero reserved bytes\n");
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return -EINVAL;
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}
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/* verify queue size and vring alignment are sane */
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if (!vring->num || !vring->align) {
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dev_err(dev, "invalid qsz (%d) or alignment (%d)\n",
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vring->num, vring->align);
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return -EINVAL;
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}
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rvring->len = vring->num;
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rvring->align = vring->align;
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rvring->rvdev = rvdev;
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return 0;
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}
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void rproc_free_vring(struct rproc_vring *rvring)
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{
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int size = PAGE_ALIGN(vring_size(rvring->len, rvring->align));
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struct rproc *rproc = rvring->rvdev->rproc;
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int idx = rvring->rvdev->vring - rvring;
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struct fw_rsc_vdev *rsc;
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dma_free_coherent(rproc->dev.parent, size, rvring->va, rvring->dma);
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idr_remove(&rproc->notifyids, rvring->notifyid);
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/* reset resource entry info */
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rsc = (void *)rproc->table_ptr + rvring->rvdev->rsc_offset;
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rsc->vring[idx].da = 0;
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rsc->vring[idx].notifyid = -1;
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}
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/**
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* rproc_handle_vdev() - handle a vdev fw resource
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* @rproc: the remote processor
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* @rsc: the vring resource descriptor
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* @avail: size of available data (for sanity checking the image)
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*
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* This resource entry requests the host to statically register a virtio
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* device (vdev), and setup everything needed to support it. It contains
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* everything needed to make it possible: the virtio device id, virtio
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* device features, vrings information, virtio config space, etc...
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*
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* Before registering the vdev, the vrings are allocated from non-cacheable
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* physically contiguous memory. Currently we only support two vrings per
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* remote processor (temporary limitation). We might also want to consider
|
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* doing the vring allocation only later when ->find_vqs() is invoked, and
|
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* then release them upon ->del_vqs().
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*
|
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* Note: @da is currently not really handled correctly: we dynamically
|
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* allocate it using the DMA API, ignoring requested hard coded addresses,
|
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* and we don't take care of any required IOMMU programming. This is all
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* going to be taken care of when the generic iommu-based DMA API will be
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* merged. Meanwhile, statically-addressed iommu-based firmware images should
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* use RSC_DEVMEM resource entries to map their required @da to the physical
|
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* address of their base CMA region (ouch, hacky!).
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*
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* Returns 0 on success, or an appropriate error code otherwise
|
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*/
|
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static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
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int offset, int avail)
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{
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struct device *dev = &rproc->dev;
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struct rproc_vdev *rvdev;
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int i, ret;
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|
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/* make sure resource isn't truncated */
|
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if (sizeof(*rsc) + rsc->num_of_vrings * sizeof(struct fw_rsc_vdev_vring)
|
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+ rsc->config_len > avail) {
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dev_err(dev, "vdev rsc is truncated\n");
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return -EINVAL;
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}
|
|
|
|
/* make sure reserved bytes are zeroes */
|
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if (rsc->reserved[0] || rsc->reserved[1]) {
|
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dev_err(dev, "vdev rsc has non zero reserved bytes\n");
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return -EINVAL;
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}
|
|
|
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dev_dbg(dev, "vdev rsc: id %d, dfeatures %x, cfg len %d, %d vrings\n",
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rsc->id, rsc->dfeatures, rsc->config_len, rsc->num_of_vrings);
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|
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/* we currently support only two vrings per rvdev */
|
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if (rsc->num_of_vrings > ARRAY_SIZE(rvdev->vring)) {
|
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dev_err(dev, "too many vrings: %d\n", rsc->num_of_vrings);
|
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return -EINVAL;
|
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}
|
|
|
|
rvdev = kzalloc(sizeof(struct rproc_vdev), GFP_KERNEL);
|
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if (!rvdev)
|
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return -ENOMEM;
|
|
|
|
rvdev->rproc = rproc;
|
|
|
|
/* parse the vrings */
|
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for (i = 0; i < rsc->num_of_vrings; i++) {
|
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ret = rproc_parse_vring(rvdev, rsc, i);
|
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if (ret)
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goto free_rvdev;
|
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}
|
|
|
|
/* remember the resource offset*/
|
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rvdev->rsc_offset = offset;
|
|
|
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list_add_tail(&rvdev->node, &rproc->rvdevs);
|
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|
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/* it is now safe to add the virtio device */
|
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ret = rproc_add_virtio_dev(rvdev, rsc->id);
|
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if (ret)
|
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goto remove_rvdev;
|
|
|
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return 0;
|
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|
|
remove_rvdev:
|
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list_del(&rvdev->node);
|
|
free_rvdev:
|
|
kfree(rvdev);
|
|
return ret;
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}
|
|
|
|
/**
|
|
* rproc_handle_trace() - handle a shared trace buffer resource
|
|
* @rproc: the remote processor
|
|
* @rsc: the trace resource descriptor
|
|
* @avail: size of available data (for sanity checking the image)
|
|
*
|
|
* In case the remote processor dumps trace logs into memory,
|
|
* export it via debugfs.
|
|
*
|
|
* Currently, the 'da' member of @rsc should contain the device address
|
|
* where the remote processor is dumping the traces. Later we could also
|
|
* support dynamically allocating this address using the generic
|
|
* DMA API (but currently there isn't a use case for that).
|
|
*
|
|
* Returns 0 on success, or an appropriate error code otherwise
|
|
*/
|
|
static int rproc_handle_trace(struct rproc *rproc, struct fw_rsc_trace *rsc,
|
|
int offset, int avail)
|
|
{
|
|
struct rproc_mem_entry *trace;
|
|
struct device *dev = &rproc->dev;
|
|
void *ptr;
|
|
char name[15];
|
|
|
|
if (sizeof(*rsc) > avail) {
|
|
dev_err(dev, "trace rsc is truncated\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* make sure reserved bytes are zeroes */
|
|
if (rsc->reserved) {
|
|
dev_err(dev, "trace rsc has non zero reserved bytes\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* what's the kernel address of this resource ? */
|
|
ptr = rproc_da_to_va(rproc, rsc->da, rsc->len);
|
|
if (!ptr) {
|
|
dev_err(dev, "erroneous trace resource entry\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
trace = kzalloc(sizeof(*trace), GFP_KERNEL);
|
|
if (!trace)
|
|
return -ENOMEM;
|
|
|
|
/* set the trace buffer dma properties */
|
|
trace->len = rsc->len;
|
|
trace->va = ptr;
|
|
|
|
/* make sure snprintf always null terminates, even if truncating */
|
|
snprintf(name, sizeof(name), "trace%d", rproc->num_traces);
|
|
|
|
/* create the debugfs entry */
|
|
trace->priv = rproc_create_trace_file(name, rproc, trace);
|
|
if (!trace->priv) {
|
|
trace->va = NULL;
|
|
kfree(trace);
|
|
return -EINVAL;
|
|
}
|
|
|
|
list_add_tail(&trace->node, &rproc->traces);
|
|
|
|
rproc->num_traces++;
|
|
|
|
dev_dbg(dev, "%s added: va %p, da 0x%x, len 0x%x\n", name, ptr,
|
|
rsc->da, rsc->len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* rproc_handle_devmem() - handle devmem resource entry
|
|
* @rproc: remote processor handle
|
|
* @rsc: the devmem resource entry
|
|
* @avail: size of available data (for sanity checking the image)
|
|
*
|
|
* Remote processors commonly need to access certain on-chip peripherals.
|
|
*
|
|
* Some of these remote processors access memory via an iommu device,
|
|
* and might require us to configure their iommu before they can access
|
|
* the on-chip peripherals they need.
|
|
*
|
|
* This resource entry is a request to map such a peripheral device.
|
|
*
|
|
* These devmem entries will contain the physical address of the device in
|
|
* the 'pa' member. If a specific device address is expected, then 'da' will
|
|
* contain it (currently this is the only use case supported). 'len' will
|
|
* contain the size of the physical region we need to map.
|
|
*
|
|
* Currently we just "trust" those devmem entries to contain valid physical
|
|
* addresses, but this is going to change: we want the implementations to
|
|
* tell us ranges of physical addresses the firmware is allowed to request,
|
|
* and not allow firmwares to request access to physical addresses that
|
|
* are outside those ranges.
|
|
*/
|
|
static int rproc_handle_devmem(struct rproc *rproc, struct fw_rsc_devmem *rsc,
|
|
int offset, int avail)
|
|
{
|
|
struct rproc_mem_entry *mapping;
|
|
struct device *dev = &rproc->dev;
|
|
int ret;
|
|
|
|
/* no point in handling this resource without a valid iommu domain */
|
|
if (!rproc->domain)
|
|
return -EINVAL;
|
|
|
|
if (sizeof(*rsc) > avail) {
|
|
dev_err(dev, "devmem rsc is truncated\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* make sure reserved bytes are zeroes */
|
|
if (rsc->reserved) {
|
|
dev_err(dev, "devmem rsc has non zero reserved bytes\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
|
|
if (!mapping)
|
|
return -ENOMEM;
|
|
|
|
ret = iommu_map(rproc->domain, rsc->da, rsc->pa, rsc->len, rsc->flags);
|
|
if (ret) {
|
|
dev_err(dev, "failed to map devmem: %d\n", ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* We'll need this info later when we'll want to unmap everything
|
|
* (e.g. on shutdown).
|
|
*
|
|
* We can't trust the remote processor not to change the resource
|
|
* table, so we must maintain this info independently.
|
|
*/
|
|
mapping->da = rsc->da;
|
|
mapping->len = rsc->len;
|
|
list_add_tail(&mapping->node, &rproc->mappings);
|
|
|
|
dev_dbg(dev, "mapped devmem pa 0x%x, da 0x%x, len 0x%x\n",
|
|
rsc->pa, rsc->da, rsc->len);
|
|
|
|
return 0;
|
|
|
|
out:
|
|
kfree(mapping);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* rproc_handle_carveout() - handle phys contig memory allocation requests
|
|
* @rproc: rproc handle
|
|
* @rsc: the resource entry
|
|
* @avail: size of available data (for image validation)
|
|
*
|
|
* This function will handle firmware requests for allocation of physically
|
|
* contiguous memory regions.
|
|
*
|
|
* These request entries should come first in the firmware's resource table,
|
|
* as other firmware entries might request placing other data objects inside
|
|
* these memory regions (e.g. data/code segments, trace resource entries, ...).
|
|
*
|
|
* Allocating memory this way helps utilizing the reserved physical memory
|
|
* (e.g. CMA) more efficiently, and also minimizes the number of TLB entries
|
|
* needed to map it (in case @rproc is using an IOMMU). Reducing the TLB
|
|
* pressure is important; it may have a substantial impact on performance.
|
|
*/
|
|
static int rproc_handle_carveout(struct rproc *rproc,
|
|
struct fw_rsc_carveout *rsc,
|
|
int offset, int avail)
|
|
|
|
{
|
|
struct rproc_mem_entry *carveout, *mapping;
|
|
struct device *dev = &rproc->dev;
|
|
dma_addr_t dma;
|
|
void *va;
|
|
int ret;
|
|
|
|
if (sizeof(*rsc) > avail) {
|
|
dev_err(dev, "carveout rsc is truncated\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* make sure reserved bytes are zeroes */
|
|
if (rsc->reserved) {
|
|
dev_err(dev, "carveout rsc has non zero reserved bytes\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev_dbg(dev, "carveout rsc: da %x, pa %x, len %x, flags %x\n",
|
|
rsc->da, rsc->pa, rsc->len, rsc->flags);
|
|
|
|
carveout = kzalloc(sizeof(*carveout), GFP_KERNEL);
|
|
if (!carveout)
|
|
return -ENOMEM;
|
|
|
|
va = dma_alloc_coherent(dev->parent, rsc->len, &dma, GFP_KERNEL);
|
|
if (!va) {
|
|
dev_err(dev->parent, "dma_alloc_coherent err: %d\n", rsc->len);
|
|
ret = -ENOMEM;
|
|
goto free_carv;
|
|
}
|
|
|
|
dev_dbg(dev, "carveout va %p, dma %llx, len 0x%x\n", va,
|
|
(unsigned long long)dma, rsc->len);
|
|
|
|
/*
|
|
* Ok, this is non-standard.
|
|
*
|
|
* Sometimes we can't rely on the generic iommu-based DMA API
|
|
* to dynamically allocate the device address and then set the IOMMU
|
|
* tables accordingly, because some remote processors might
|
|
* _require_ us to use hard coded device addresses that their
|
|
* firmware was compiled with.
|
|
*
|
|
* In this case, we must use the IOMMU API directly and map
|
|
* the memory to the device address as expected by the remote
|
|
* processor.
|
|
*
|
|
* Obviously such remote processor devices should not be configured
|
|
* to use the iommu-based DMA API: we expect 'dma' to contain the
|
|
* physical address in this case.
|
|
*/
|
|
if (rproc->domain) {
|
|
mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
|
|
if (!mapping) {
|
|
dev_err(dev, "kzalloc mapping failed\n");
|
|
ret = -ENOMEM;
|
|
goto dma_free;
|
|
}
|
|
|
|
ret = iommu_map(rproc->domain, rsc->da, dma, rsc->len,
|
|
rsc->flags);
|
|
if (ret) {
|
|
dev_err(dev, "iommu_map failed: %d\n", ret);
|
|
goto free_mapping;
|
|
}
|
|
|
|
/*
|
|
* We'll need this info later when we'll want to unmap
|
|
* everything (e.g. on shutdown).
|
|
*
|
|
* We can't trust the remote processor not to change the
|
|
* resource table, so we must maintain this info independently.
|
|
*/
|
|
mapping->da = rsc->da;
|
|
mapping->len = rsc->len;
|
|
list_add_tail(&mapping->node, &rproc->mappings);
|
|
|
|
dev_dbg(dev, "carveout mapped 0x%x to 0x%llx\n",
|
|
rsc->da, (unsigned long long)dma);
|
|
}
|
|
|
|
/*
|
|
* Some remote processors might need to know the pa
|
|
* even though they are behind an IOMMU. E.g., OMAP4's
|
|
* remote M3 processor needs this so it can control
|
|
* on-chip hardware accelerators that are not behind
|
|
* the IOMMU, and therefor must know the pa.
|
|
*
|
|
* Generally we don't want to expose physical addresses
|
|
* if we don't have to (remote processors are generally
|
|
* _not_ trusted), so we might want to do this only for
|
|
* remote processor that _must_ have this (e.g. OMAP4's
|
|
* dual M3 subsystem).
|
|
*
|
|
* Non-IOMMU processors might also want to have this info.
|
|
* In this case, the device address and the physical address
|
|
* are the same.
|
|
*/
|
|
rsc->pa = dma;
|
|
|
|
carveout->va = va;
|
|
carveout->len = rsc->len;
|
|
carveout->dma = dma;
|
|
carveout->da = rsc->da;
|
|
|
|
list_add_tail(&carveout->node, &rproc->carveouts);
|
|
|
|
return 0;
|
|
|
|
free_mapping:
|
|
kfree(mapping);
|
|
dma_free:
|
|
dma_free_coherent(dev->parent, rsc->len, va, dma);
|
|
free_carv:
|
|
kfree(carveout);
|
|
return ret;
|
|
}
|
|
|
|
static int rproc_count_vrings(struct rproc *rproc, struct fw_rsc_vdev *rsc,
|
|
int offset, int avail)
|
|
{
|
|
/* Summarize the number of notification IDs */
|
|
rproc->max_notifyid += rsc->num_of_vrings;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* A lookup table for resource handlers. The indices are defined in
|
|
* enum fw_resource_type.
|
|
*/
|
|
static rproc_handle_resource_t rproc_loading_handlers[RSC_LAST] = {
|
|
[RSC_CARVEOUT] = (rproc_handle_resource_t)rproc_handle_carveout,
|
|
[RSC_DEVMEM] = (rproc_handle_resource_t)rproc_handle_devmem,
|
|
[RSC_TRACE] = (rproc_handle_resource_t)rproc_handle_trace,
|
|
[RSC_VDEV] = NULL, /* VDEVs were handled upon registrarion */
|
|
};
|
|
|
|
static rproc_handle_resource_t rproc_vdev_handler[RSC_LAST] = {
|
|
[RSC_VDEV] = (rproc_handle_resource_t)rproc_handle_vdev,
|
|
};
|
|
|
|
static rproc_handle_resource_t rproc_count_vrings_handler[RSC_LAST] = {
|
|
[RSC_VDEV] = (rproc_handle_resource_t)rproc_count_vrings,
|
|
};
|
|
|
|
/* handle firmware resource entries before booting the remote processor */
|
|
static int rproc_handle_resources(struct rproc *rproc, int len,
|
|
rproc_handle_resource_t handlers[RSC_LAST])
|
|
{
|
|
struct device *dev = &rproc->dev;
|
|
rproc_handle_resource_t handler;
|
|
int ret = 0, i;
|
|
|
|
for (i = 0; i < rproc->table_ptr->num; i++) {
|
|
int offset = rproc->table_ptr->offset[i];
|
|
struct fw_rsc_hdr *hdr = (void *)rproc->table_ptr + offset;
|
|
int avail = len - offset - sizeof(*hdr);
|
|
void *rsc = (void *)hdr + sizeof(*hdr);
|
|
|
|
/* make sure table isn't truncated */
|
|
if (avail < 0) {
|
|
dev_err(dev, "rsc table is truncated\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev_dbg(dev, "rsc: type %d\n", hdr->type);
|
|
|
|
if (hdr->type >= RSC_LAST) {
|
|
dev_warn(dev, "unsupported resource %d\n", hdr->type);
|
|
continue;
|
|
}
|
|
|
|
handler = handlers[hdr->type];
|
|
if (!handler)
|
|
continue;
|
|
|
|
ret = handler(rproc, rsc, offset + sizeof(*hdr), avail);
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* rproc_resource_cleanup() - clean up and free all acquired resources
|
|
* @rproc: rproc handle
|
|
*
|
|
* This function will free all resources acquired for @rproc, and it
|
|
* is called whenever @rproc either shuts down or fails to boot.
|
|
*/
|
|
static void rproc_resource_cleanup(struct rproc *rproc)
|
|
{
|
|
struct rproc_mem_entry *entry, *tmp;
|
|
struct device *dev = &rproc->dev;
|
|
|
|
/* clean up debugfs trace entries */
|
|
list_for_each_entry_safe(entry, tmp, &rproc->traces, node) {
|
|
rproc_remove_trace_file(entry->priv);
|
|
rproc->num_traces--;
|
|
list_del(&entry->node);
|
|
kfree(entry);
|
|
}
|
|
|
|
/* clean up iommu mapping entries */
|
|
list_for_each_entry_safe(entry, tmp, &rproc->mappings, node) {
|
|
size_t unmapped;
|
|
|
|
unmapped = iommu_unmap(rproc->domain, entry->da, entry->len);
|
|
if (unmapped != entry->len) {
|
|
/* nothing much to do besides complaining */
|
|
dev_err(dev, "failed to unmap %u/%zu\n", entry->len,
|
|
unmapped);
|
|
}
|
|
|
|
list_del(&entry->node);
|
|
kfree(entry);
|
|
}
|
|
|
|
/* clean up carveout allocations */
|
|
list_for_each_entry_safe(entry, tmp, &rproc->carveouts, node) {
|
|
dma_free_coherent(dev->parent, entry->len, entry->va,
|
|
entry->dma);
|
|
list_del(&entry->node);
|
|
kfree(entry);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* take a firmware and boot a remote processor with it.
|
|
*/
|
|
static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
|
|
{
|
|
struct device *dev = &rproc->dev;
|
|
const char *name = rproc->firmware;
|
|
struct resource_table *table, *loaded_table;
|
|
int ret, tablesz;
|
|
|
|
if (!rproc->table_ptr)
|
|
return -ENOMEM;
|
|
|
|
ret = rproc_fw_sanity_check(rproc, fw);
|
|
if (ret)
|
|
return ret;
|
|
|
|
dev_info(dev, "Booting fw image %s, size %zd\n", name, fw->size);
|
|
|
|
/*
|
|
* if enabling an IOMMU isn't relevant for this rproc, this is
|
|
* just a nop
|
|
*/
|
|
ret = rproc_enable_iommu(rproc);
|
|
if (ret) {
|
|
dev_err(dev, "can't enable iommu: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
rproc->bootaddr = rproc_get_boot_addr(rproc, fw);
|
|
ret = -EINVAL;
|
|
|
|
/* look for the resource table */
|
|
table = rproc_find_rsc_table(rproc, fw, &tablesz);
|
|
if (!table) {
|
|
dev_err(dev, "Failed to find resource table\n");
|
|
goto clean_up;
|
|
}
|
|
|
|
/* Verify that resource table in loaded fw is unchanged */
|
|
if (rproc->table_csum != crc32(0, table, tablesz)) {
|
|
dev_err(dev, "resource checksum failed, fw changed?\n");
|
|
goto clean_up;
|
|
}
|
|
|
|
/* handle fw resources which are required to boot rproc */
|
|
ret = rproc_handle_resources(rproc, tablesz, rproc_loading_handlers);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to process resources: %d\n", ret);
|
|
goto clean_up;
|
|
}
|
|
|
|
/* load the ELF segments to memory */
|
|
ret = rproc_load_segments(rproc, fw);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to load program segments: %d\n", ret);
|
|
goto clean_up;
|
|
}
|
|
|
|
/*
|
|
* The starting device has been given the rproc->cached_table as the
|
|
* resource table. The address of the vring along with the other
|
|
* allocated resources (carveouts etc) is stored in cached_table.
|
|
* In order to pass this information to the remote device we must
|
|
* copy this information to device memory.
|
|
*/
|
|
loaded_table = rproc_find_loaded_rsc_table(rproc, fw);
|
|
if (loaded_table)
|
|
memcpy(loaded_table, rproc->cached_table, tablesz);
|
|
|
|
/* power up the remote processor */
|
|
ret = rproc->ops->start(rproc);
|
|
if (ret) {
|
|
dev_err(dev, "can't start rproc %s: %d\n", rproc->name, ret);
|
|
goto clean_up;
|
|
}
|
|
|
|
/*
|
|
* Update table_ptr so that all subsequent vring allocations and
|
|
* virtio fields manipulation update the actual loaded resource table
|
|
* in device memory.
|
|
*/
|
|
rproc->table_ptr = loaded_table;
|
|
|
|
rproc->state = RPROC_RUNNING;
|
|
|
|
dev_info(dev, "remote processor %s is now up\n", rproc->name);
|
|
|
|
return 0;
|
|
|
|
clean_up:
|
|
rproc_resource_cleanup(rproc);
|
|
rproc_disable_iommu(rproc);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* take a firmware and look for virtio devices to register.
|
|
*
|
|
* Note: this function is called asynchronously upon registration of the
|
|
* remote processor (so we must wait until it completes before we try
|
|
* to unregister the device. one other option is just to use kref here,
|
|
* that might be cleaner).
|
|
*/
|
|
static void rproc_fw_config_virtio(const struct firmware *fw, void *context)
|
|
{
|
|
struct rproc *rproc = context;
|
|
struct resource_table *table;
|
|
int ret, tablesz;
|
|
|
|
if (rproc_fw_sanity_check(rproc, fw) < 0)
|
|
goto out;
|
|
|
|
/* look for the resource table */
|
|
table = rproc_find_rsc_table(rproc, fw, &tablesz);
|
|
if (!table)
|
|
goto out;
|
|
|
|
rproc->table_csum = crc32(0, table, tablesz);
|
|
|
|
/*
|
|
* Create a copy of the resource table. When a virtio device starts
|
|
* and calls vring_new_virtqueue() the address of the allocated vring
|
|
* will be stored in the cached_table. Before the device is started,
|
|
* cached_table will be copied into devic memory.
|
|
*/
|
|
rproc->cached_table = kmemdup(table, tablesz, GFP_KERNEL);
|
|
if (!rproc->cached_table)
|
|
goto out;
|
|
|
|
rproc->table_ptr = rproc->cached_table;
|
|
|
|
/* count the number of notify-ids */
|
|
rproc->max_notifyid = -1;
|
|
ret = rproc_handle_resources(rproc, tablesz,
|
|
rproc_count_vrings_handler);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* look for virtio devices and register them */
|
|
ret = rproc_handle_resources(rproc, tablesz, rproc_vdev_handler);
|
|
|
|
out:
|
|
release_firmware(fw);
|
|
/* allow rproc_del() contexts, if any, to proceed */
|
|
complete_all(&rproc->firmware_loading_complete);
|
|
}
|
|
|
|
static int rproc_add_virtio_devices(struct rproc *rproc)
|
|
{
|
|
int ret;
|
|
|
|
/* rproc_del() calls must wait until async loader completes */
|
|
init_completion(&rproc->firmware_loading_complete);
|
|
|
|
/*
|
|
* We must retrieve early virtio configuration info from
|
|
* the firmware (e.g. whether to register a virtio device,
|
|
* what virtio features does it support, ...).
|
|
*
|
|
* We're initiating an asynchronous firmware loading, so we can
|
|
* be built-in kernel code, without hanging the boot process.
|
|
*/
|
|
ret = request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG,
|
|
rproc->firmware, &rproc->dev, GFP_KERNEL,
|
|
rproc, rproc_fw_config_virtio);
|
|
if (ret < 0) {
|
|
dev_err(&rproc->dev, "request_firmware_nowait err: %d\n", ret);
|
|
complete_all(&rproc->firmware_loading_complete);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* rproc_trigger_recovery() - recover a remoteproc
|
|
* @rproc: the remote processor
|
|
*
|
|
* The recovery is done by reseting all the virtio devices, that way all the
|
|
* rpmsg drivers will be reseted along with the remote processor making the
|
|
* remoteproc functional again.
|
|
*
|
|
* This function can sleep, so it cannot be called from atomic context.
|
|
*/
|
|
int rproc_trigger_recovery(struct rproc *rproc)
|
|
{
|
|
struct rproc_vdev *rvdev, *rvtmp;
|
|
|
|
dev_err(&rproc->dev, "recovering %s\n", rproc->name);
|
|
|
|
init_completion(&rproc->crash_comp);
|
|
|
|
/* clean up remote vdev entries */
|
|
list_for_each_entry_safe(rvdev, rvtmp, &rproc->rvdevs, node)
|
|
rproc_remove_virtio_dev(rvdev);
|
|
|
|
/* wait until there is no more rproc users */
|
|
wait_for_completion(&rproc->crash_comp);
|
|
|
|
/* Free the copy of the resource table */
|
|
kfree(rproc->cached_table);
|
|
|
|
return rproc_add_virtio_devices(rproc);
|
|
}
|
|
|
|
/**
|
|
* rproc_crash_handler_work() - handle a crash
|
|
*
|
|
* This function needs to handle everything related to a crash, like cpu
|
|
* registers and stack dump, information to help to debug the fatal error, etc.
|
|
*/
|
|
static void rproc_crash_handler_work(struct work_struct *work)
|
|
{
|
|
struct rproc *rproc = container_of(work, struct rproc, crash_handler);
|
|
struct device *dev = &rproc->dev;
|
|
|
|
dev_dbg(dev, "enter %s\n", __func__);
|
|
|
|
mutex_lock(&rproc->lock);
|
|
|
|
if (rproc->state == RPROC_CRASHED || rproc->state == RPROC_OFFLINE) {
|
|
/* handle only the first crash detected */
|
|
mutex_unlock(&rproc->lock);
|
|
return;
|
|
}
|
|
|
|
rproc->state = RPROC_CRASHED;
|
|
dev_err(dev, "handling crash #%u in %s\n", ++rproc->crash_cnt,
|
|
rproc->name);
|
|
|
|
mutex_unlock(&rproc->lock);
|
|
|
|
if (!rproc->recovery_disabled)
|
|
rproc_trigger_recovery(rproc);
|
|
}
|
|
|
|
/**
|
|
* __rproc_boot() - boot a remote processor
|
|
* @rproc: handle of a remote processor
|
|
* @wait: wait for rproc registration completion
|
|
*
|
|
* Boot a remote processor (i.e. load its firmware, power it on, ...).
|
|
*
|
|
* If the remote processor is already powered on, this function immediately
|
|
* returns (successfully).
|
|
*
|
|
* Returns 0 on success, and an appropriate error value otherwise.
|
|
*/
|
|
static int __rproc_boot(struct rproc *rproc, bool wait)
|
|
{
|
|
const struct firmware *firmware_p;
|
|
struct device *dev;
|
|
int ret;
|
|
|
|
if (!rproc) {
|
|
pr_err("invalid rproc handle\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev = &rproc->dev;
|
|
|
|
ret = mutex_lock_interruptible(&rproc->lock);
|
|
if (ret) {
|
|
dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret);
|
|
return ret;
|
|
}
|
|
|
|
/* loading a firmware is required */
|
|
if (!rproc->firmware) {
|
|
dev_err(dev, "%s: no firmware to load\n", __func__);
|
|
ret = -EINVAL;
|
|
goto unlock_mutex;
|
|
}
|
|
|
|
/* prevent underlying implementation from being removed */
|
|
if (!try_module_get(dev->parent->driver->owner)) {
|
|
dev_err(dev, "%s: can't get owner\n", __func__);
|
|
ret = -EINVAL;
|
|
goto unlock_mutex;
|
|
}
|
|
|
|
/* skip the boot process if rproc is already powered up */
|
|
if (atomic_inc_return(&rproc->power) > 1) {
|
|
ret = 0;
|
|
goto unlock_mutex;
|
|
}
|
|
|
|
dev_info(dev, "powering up %s\n", rproc->name);
|
|
|
|
/* load firmware */
|
|
ret = request_firmware(&firmware_p, rproc->firmware, dev);
|
|
if (ret < 0) {
|
|
dev_err(dev, "request_firmware failed: %d\n", ret);
|
|
goto downref_rproc;
|
|
}
|
|
|
|
/* if rproc virtio is not yet configured, wait */
|
|
if (wait)
|
|
wait_for_completion(&rproc->firmware_loading_complete);
|
|
|
|
ret = rproc_fw_boot(rproc, firmware_p);
|
|
|
|
release_firmware(firmware_p);
|
|
|
|
downref_rproc:
|
|
if (ret) {
|
|
module_put(dev->parent->driver->owner);
|
|
atomic_dec(&rproc->power);
|
|
}
|
|
unlock_mutex:
|
|
mutex_unlock(&rproc->lock);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* rproc_boot() - boot a remote processor
|
|
* @rproc: handle of a remote processor
|
|
*/
|
|
int rproc_boot(struct rproc *rproc)
|
|
{
|
|
return __rproc_boot(rproc, true);
|
|
}
|
|
EXPORT_SYMBOL(rproc_boot);
|
|
|
|
/**
|
|
* rproc_boot_nowait() - boot a remote processor
|
|
* @rproc: handle of a remote processor
|
|
*
|
|
* Same as rproc_boot() but don't wait for rproc registration completion
|
|
*/
|
|
int rproc_boot_nowait(struct rproc *rproc)
|
|
{
|
|
return __rproc_boot(rproc, false);
|
|
}
|
|
|
|
/**
|
|
* rproc_shutdown() - power off the remote processor
|
|
* @rproc: the remote processor
|
|
*
|
|
* Power off a remote processor (previously booted with rproc_boot()).
|
|
*
|
|
* In case @rproc is still being used by an additional user(s), then
|
|
* this function will just decrement the power refcount and exit,
|
|
* without really powering off the device.
|
|
*
|
|
* Every call to rproc_boot() must (eventually) be accompanied by a call
|
|
* to rproc_shutdown(). Calling rproc_shutdown() redundantly is a bug.
|
|
*
|
|
* Notes:
|
|
* - we're not decrementing the rproc's refcount, only the power refcount.
|
|
* which means that the @rproc handle stays valid even after rproc_shutdown()
|
|
* returns, and users can still use it with a subsequent rproc_boot(), if
|
|
* needed.
|
|
*/
|
|
void rproc_shutdown(struct rproc *rproc)
|
|
{
|
|
struct device *dev = &rproc->dev;
|
|
int ret;
|
|
|
|
ret = mutex_lock_interruptible(&rproc->lock);
|
|
if (ret) {
|
|
dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret);
|
|
return;
|
|
}
|
|
|
|
/* if the remote proc is still needed, bail out */
|
|
if (!atomic_dec_and_test(&rproc->power))
|
|
goto out;
|
|
|
|
/* power off the remote processor */
|
|
ret = rproc->ops->stop(rproc);
|
|
if (ret) {
|
|
atomic_inc(&rproc->power);
|
|
dev_err(dev, "can't stop rproc: %d\n", ret);
|
|
goto out;
|
|
}
|
|
|
|
/* clean up all acquired resources */
|
|
rproc_resource_cleanup(rproc);
|
|
|
|
rproc_disable_iommu(rproc);
|
|
|
|
/* Give the next start a clean resource table */
|
|
rproc->table_ptr = rproc->cached_table;
|
|
|
|
/* if in crash state, unlock crash handler */
|
|
if (rproc->state == RPROC_CRASHED)
|
|
complete_all(&rproc->crash_comp);
|
|
|
|
rproc->state = RPROC_OFFLINE;
|
|
|
|
dev_info(dev, "stopped remote processor %s\n", rproc->name);
|
|
|
|
out:
|
|
mutex_unlock(&rproc->lock);
|
|
if (!ret)
|
|
module_put(dev->parent->driver->owner);
|
|
}
|
|
EXPORT_SYMBOL(rproc_shutdown);
|
|
|
|
/**
|
|
* rproc_get_by_phandle() - find a remote processor by phandle
|
|
* @phandle: phandle to the rproc
|
|
*
|
|
* Finds an rproc handle using the remote processor's phandle, and then
|
|
* return a handle to the rproc.
|
|
*
|
|
* This function increments the remote processor's refcount, so always
|
|
* use rproc_put() to decrement it back once rproc isn't needed anymore.
|
|
*
|
|
* Returns the rproc handle on success, and NULL on failure.
|
|
*/
|
|
#ifdef CONFIG_OF
|
|
struct rproc *rproc_get_by_phandle(phandle phandle)
|
|
{
|
|
struct rproc *rproc = NULL, *r;
|
|
struct device_node *np;
|
|
|
|
np = of_find_node_by_phandle(phandle);
|
|
if (!np)
|
|
return NULL;
|
|
|
|
mutex_lock(&rproc_list_mutex);
|
|
list_for_each_entry(r, &rproc_list, node) {
|
|
if (r->dev.parent && r->dev.parent->of_node == np) {
|
|
rproc = r;
|
|
get_device(&rproc->dev);
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&rproc_list_mutex);
|
|
|
|
of_node_put(np);
|
|
|
|
return rproc;
|
|
}
|
|
#else
|
|
struct rproc *rproc_get_by_phandle(phandle phandle)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
EXPORT_SYMBOL(rproc_get_by_phandle);
|
|
|
|
/**
|
|
* rproc_add() - register a remote processor
|
|
* @rproc: the remote processor handle to register
|
|
*
|
|
* Registers @rproc with the remoteproc framework, after it has been
|
|
* allocated with rproc_alloc().
|
|
*
|
|
* This is called by the platform-specific rproc implementation, whenever
|
|
* a new remote processor device is probed.
|
|
*
|
|
* Returns 0 on success and an appropriate error code otherwise.
|
|
*
|
|
* Note: this function initiates an asynchronous firmware loading
|
|
* context, which will look for virtio devices supported by the rproc's
|
|
* firmware.
|
|
*
|
|
* If found, those virtio devices will be created and added, so as a result
|
|
* of registering this remote processor, additional virtio drivers might be
|
|
* probed.
|
|
*/
|
|
int rproc_add(struct rproc *rproc)
|
|
{
|
|
struct device *dev = &rproc->dev;
|
|
int ret;
|
|
|
|
ret = device_add(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
dev_info(dev, "%s is available\n", rproc->name);
|
|
|
|
dev_info(dev, "Note: remoteproc is still under development and considered experimental.\n");
|
|
dev_info(dev, "THE BINARY FORMAT IS NOT YET FINALIZED, and backward compatibility isn't yet guaranteed.\n");
|
|
|
|
/* create debugfs entries */
|
|
rproc_create_debug_dir(rproc);
|
|
ret = rproc_add_virtio_devices(rproc);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* expose to rproc_get_by_phandle users */
|
|
mutex_lock(&rproc_list_mutex);
|
|
list_add(&rproc->node, &rproc_list);
|
|
mutex_unlock(&rproc_list_mutex);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(rproc_add);
|
|
|
|
/**
|
|
* rproc_type_release() - release a remote processor instance
|
|
* @dev: the rproc's device
|
|
*
|
|
* This function should _never_ be called directly.
|
|
*
|
|
* It will be called by the driver core when no one holds a valid pointer
|
|
* to @dev anymore.
|
|
*/
|
|
static void rproc_type_release(struct device *dev)
|
|
{
|
|
struct rproc *rproc = container_of(dev, struct rproc, dev);
|
|
|
|
dev_info(&rproc->dev, "releasing %s\n", rproc->name);
|
|
|
|
rproc_delete_debug_dir(rproc);
|
|
|
|
idr_destroy(&rproc->notifyids);
|
|
|
|
if (rproc->index >= 0)
|
|
ida_simple_remove(&rproc_dev_index, rproc->index);
|
|
|
|
kfree(rproc);
|
|
}
|
|
|
|
static struct device_type rproc_type = {
|
|
.name = "remoteproc",
|
|
.release = rproc_type_release,
|
|
};
|
|
|
|
/**
|
|
* rproc_alloc() - allocate a remote processor handle
|
|
* @dev: the underlying device
|
|
* @name: name of this remote processor
|
|
* @ops: platform-specific handlers (mainly start/stop)
|
|
* @firmware: name of firmware file to load, can be NULL
|
|
* @len: length of private data needed by the rproc driver (in bytes)
|
|
*
|
|
* Allocates a new remote processor handle, but does not register
|
|
* it yet. if @firmware is NULL, a default name is used.
|
|
*
|
|
* This function should be used by rproc implementations during initialization
|
|
* of the remote processor.
|
|
*
|
|
* After creating an rproc handle using this function, and when ready,
|
|
* implementations should then call rproc_add() to complete
|
|
* the registration of the remote processor.
|
|
*
|
|
* On success the new rproc is returned, and on failure, NULL.
|
|
*
|
|
* Note: _never_ directly deallocate @rproc, even if it was not registered
|
|
* yet. Instead, when you need to unroll rproc_alloc(), use rproc_put().
|
|
*/
|
|
struct rproc *rproc_alloc(struct device *dev, const char *name,
|
|
const struct rproc_ops *ops,
|
|
const char *firmware, int len)
|
|
{
|
|
struct rproc *rproc;
|
|
char *p, *template = "rproc-%s-fw";
|
|
int name_len = 0;
|
|
|
|
if (!dev || !name || !ops)
|
|
return NULL;
|
|
|
|
if (!firmware)
|
|
/*
|
|
* Make room for default firmware name (minus %s plus '\0').
|
|
* If the caller didn't pass in a firmware name then
|
|
* construct a default name. We're already glomming 'len'
|
|
* bytes onto the end of the struct rproc allocation, so do
|
|
* a few more for the default firmware name (but only if
|
|
* the caller doesn't pass one).
|
|
*/
|
|
name_len = strlen(name) + strlen(template) - 2 + 1;
|
|
|
|
rproc = kzalloc(sizeof(struct rproc) + len + name_len, GFP_KERNEL);
|
|
if (!rproc)
|
|
return NULL;
|
|
|
|
if (!firmware) {
|
|
p = (char *)rproc + sizeof(struct rproc) + len;
|
|
snprintf(p, name_len, template, name);
|
|
} else {
|
|
p = (char *)firmware;
|
|
}
|
|
|
|
rproc->firmware = p;
|
|
rproc->name = name;
|
|
rproc->ops = ops;
|
|
rproc->priv = &rproc[1];
|
|
|
|
device_initialize(&rproc->dev);
|
|
rproc->dev.parent = dev;
|
|
rproc->dev.type = &rproc_type;
|
|
|
|
/* Assign a unique device index and name */
|
|
rproc->index = ida_simple_get(&rproc_dev_index, 0, 0, GFP_KERNEL);
|
|
if (rproc->index < 0) {
|
|
dev_err(dev, "ida_simple_get failed: %d\n", rproc->index);
|
|
put_device(&rproc->dev);
|
|
return NULL;
|
|
}
|
|
|
|
dev_set_name(&rproc->dev, "remoteproc%d", rproc->index);
|
|
|
|
atomic_set(&rproc->power, 0);
|
|
|
|
/* Set ELF as the default fw_ops handler */
|
|
rproc->fw_ops = &rproc_elf_fw_ops;
|
|
|
|
mutex_init(&rproc->lock);
|
|
|
|
idr_init(&rproc->notifyids);
|
|
|
|
INIT_LIST_HEAD(&rproc->carveouts);
|
|
INIT_LIST_HEAD(&rproc->mappings);
|
|
INIT_LIST_HEAD(&rproc->traces);
|
|
INIT_LIST_HEAD(&rproc->rvdevs);
|
|
|
|
INIT_WORK(&rproc->crash_handler, rproc_crash_handler_work);
|
|
init_completion(&rproc->crash_comp);
|
|
|
|
rproc->state = RPROC_OFFLINE;
|
|
|
|
return rproc;
|
|
}
|
|
EXPORT_SYMBOL(rproc_alloc);
|
|
|
|
/**
|
|
* rproc_put() - unroll rproc_alloc()
|
|
* @rproc: the remote processor handle
|
|
*
|
|
* This function decrements the rproc dev refcount.
|
|
*
|
|
* If no one holds any reference to rproc anymore, then its refcount would
|
|
* now drop to zero, and it would be freed.
|
|
*/
|
|
void rproc_put(struct rproc *rproc)
|
|
{
|
|
put_device(&rproc->dev);
|
|
}
|
|
EXPORT_SYMBOL(rproc_put);
|
|
|
|
/**
|
|
* rproc_del() - unregister a remote processor
|
|
* @rproc: rproc handle to unregister
|
|
*
|
|
* This function should be called when the platform specific rproc
|
|
* implementation decides to remove the rproc device. it should
|
|
* _only_ be called if a previous invocation of rproc_add()
|
|
* has completed successfully.
|
|
*
|
|
* After rproc_del() returns, @rproc isn't freed yet, because
|
|
* of the outstanding reference created by rproc_alloc. To decrement that
|
|
* one last refcount, one still needs to call rproc_put().
|
|
*
|
|
* Returns 0 on success and -EINVAL if @rproc isn't valid.
|
|
*/
|
|
int rproc_del(struct rproc *rproc)
|
|
{
|
|
struct rproc_vdev *rvdev, *tmp;
|
|
|
|
if (!rproc)
|
|
return -EINVAL;
|
|
|
|
/* if rproc is just being registered, wait */
|
|
wait_for_completion(&rproc->firmware_loading_complete);
|
|
|
|
/* clean up remote vdev entries */
|
|
list_for_each_entry_safe(rvdev, tmp, &rproc->rvdevs, node)
|
|
rproc_remove_virtio_dev(rvdev);
|
|
|
|
/* Free the copy of the resource table */
|
|
kfree(rproc->cached_table);
|
|
|
|
/* the rproc is downref'ed as soon as it's removed from the klist */
|
|
mutex_lock(&rproc_list_mutex);
|
|
list_del(&rproc->node);
|
|
mutex_unlock(&rproc_list_mutex);
|
|
|
|
device_del(&rproc->dev);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(rproc_del);
|
|
|
|
/**
|
|
* rproc_report_crash() - rproc crash reporter function
|
|
* @rproc: remote processor
|
|
* @type: crash type
|
|
*
|
|
* This function must be called every time a crash is detected by the low-level
|
|
* drivers implementing a specific remoteproc. This should not be called from a
|
|
* non-remoteproc driver.
|
|
*
|
|
* This function can be called from atomic/interrupt context.
|
|
*/
|
|
void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type)
|
|
{
|
|
if (!rproc) {
|
|
pr_err("NULL rproc pointer\n");
|
|
return;
|
|
}
|
|
|
|
dev_err(&rproc->dev, "crash detected in %s: type %s\n",
|
|
rproc->name, rproc_crash_to_string(type));
|
|
|
|
/* create a new task to handle the error */
|
|
schedule_work(&rproc->crash_handler);
|
|
}
|
|
EXPORT_SYMBOL(rproc_report_crash);
|
|
|
|
static int __init remoteproc_init(void)
|
|
{
|
|
rproc_init_debugfs();
|
|
|
|
return 0;
|
|
}
|
|
module_init(remoteproc_init);
|
|
|
|
static void __exit remoteproc_exit(void)
|
|
{
|
|
ida_destroy(&rproc_dev_index);
|
|
|
|
rproc_exit_debugfs();
|
|
}
|
|
module_exit(remoteproc_exit);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("Generic Remote Processor Framework");
|