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![Mathieu Poirier](/assets/img/avatar_default.png)
Allow a remote processor that was started by another entity to be switched off by the remoteproc core. For that to happen a rproc::ops::stop() operation needs to be available. Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com> Link: https://lore.kernel.org/r/20210312162453.1234145-16-mathieu.poirier@linaro.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2796 lines
72 KiB
C
2796 lines
72 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#define pr_fmt(fmt) "%s: " fmt, __func__
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#include <linux/delay.h>
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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-map-ops.h>
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#include <linux/dma-mapping.h>
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#include <linux/dma-direct.h> /* XXX: pokes into bus_dma_range */
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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/rculist.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/of_reserved_mem.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 <linux/platform_device.h>
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#include "remoteproc_internal.h"
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#define HIGH_BITS_MASK 0xFFFFFFFF00000000ULL
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static DEFINE_MUTEX(rproc_list_mutex);
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static LIST_HEAD(rproc_list);
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static struct notifier_block rproc_panic_nb;
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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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static int rproc_alloc_carveout(struct rproc *rproc,
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struct rproc_mem_entry *mem);
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static int rproc_release_carveout(struct rproc *rproc,
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struct rproc_mem_entry *mem);
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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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phys_addr_t rproc_va_to_pa(void *cpu_addr)
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{
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/*
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* Return physical address according to virtual address location
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* - in vmalloc: if region ioremapped or defined as dma_alloc_coherent
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* - in kernel: if region allocated in generic dma memory pool
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*/
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if (is_vmalloc_addr(cpu_addr)) {
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return page_to_phys(vmalloc_to_page(cpu_addr)) +
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offset_in_page(cpu_addr);
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}
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WARN_ON(!virt_addr_valid(cpu_addr));
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return virt_to_phys(cpu_addr);
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}
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EXPORT_SYMBOL(rproc_va_to_pa);
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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, size_t len, bool *is_iomem)
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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, is_iomem);
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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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/* Verify that carveout is allocated */
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if (!carveout->va)
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continue;
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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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if (is_iomem)
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*is_iomem = carveout->is_iomem;
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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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/**
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* rproc_find_carveout_by_name() - lookup the carveout region by a name
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* @rproc: handle of a remote processor
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* @name: carveout name to find (format string)
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* @...: optional parameters matching @name string
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*
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* Platform driver has the capability to register some pre-allacoted carveout
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* (physically contiguous memory regions) before rproc firmware loading and
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* associated resource table analysis. These regions may be dedicated memory
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* regions internal to the coprocessor or specified DDR region with specific
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* attributes
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*
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* This function is a helper function with which we can go over the
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* allocated carveouts and return associated region characteristics like
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* coprocessor address, length or processor virtual address.
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*
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* Return: a valid pointer on carveout entry on success or NULL on failure.
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*/
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__printf(2, 3)
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struct rproc_mem_entry *
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rproc_find_carveout_by_name(struct rproc *rproc, const char *name, ...)
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{
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va_list args;
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char _name[32];
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struct rproc_mem_entry *carveout, *mem = NULL;
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if (!name)
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return NULL;
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va_start(args, name);
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vsnprintf(_name, sizeof(_name), name, args);
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va_end(args);
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list_for_each_entry(carveout, &rproc->carveouts, node) {
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/* Compare carveout and requested names */
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if (!strcmp(carveout->name, _name)) {
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mem = carveout;
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break;
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}
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}
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return mem;
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}
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/**
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* rproc_check_carveout_da() - Check specified carveout da configuration
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* @rproc: handle of a remote processor
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* @mem: pointer on carveout to check
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* @da: area device address
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* @len: associated area size
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*
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* This function is a helper function to verify requested device area (couple
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* da, len) is part of specified carveout.
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* If da is not set (defined as FW_RSC_ADDR_ANY), only requested length is
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* checked.
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*
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* Return: 0 if carveout matches request else error
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*/
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static int rproc_check_carveout_da(struct rproc *rproc,
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struct rproc_mem_entry *mem, u32 da, u32 len)
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{
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struct device *dev = &rproc->dev;
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int delta;
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/* Check requested resource length */
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if (len > mem->len) {
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dev_err(dev, "Registered carveout doesn't fit len request\n");
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return -EINVAL;
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}
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if (da != FW_RSC_ADDR_ANY && mem->da == FW_RSC_ADDR_ANY) {
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/* Address doesn't match registered carveout configuration */
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return -EINVAL;
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} else if (da != FW_RSC_ADDR_ANY && mem->da != FW_RSC_ADDR_ANY) {
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delta = da - mem->da;
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/* Check requested resource belongs to registered carveout */
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if (delta < 0) {
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dev_err(dev,
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"Registered carveout doesn't fit da request\n");
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return -EINVAL;
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}
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if (delta + len > mem->len) {
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dev_err(dev,
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"Registered carveout doesn't fit len request\n");
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return -EINVAL;
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}
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}
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return 0;
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}
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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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int ret, notifyid;
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struct rproc_mem_entry *mem;
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size_t size;
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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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rsc = (void *)rproc->table_ptr + rvdev->rsc_offset;
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/* Search for pre-registered carveout */
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mem = rproc_find_carveout_by_name(rproc, "vdev%dvring%d", rvdev->index,
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i);
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if (mem) {
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if (rproc_check_carveout_da(rproc, mem, rsc->vring[i].da, size))
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return -ENOMEM;
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} else {
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/* Register carveout in in list */
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mem = rproc_mem_entry_init(dev, NULL, 0,
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size, rsc->vring[i].da,
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rproc_alloc_carveout,
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rproc_release_carveout,
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"vdev%dvring%d",
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rvdev->index, i);
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if (!mem) {
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dev_err(dev, "Can't allocate memory entry structure\n");
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return -ENOMEM;
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}
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rproc_add_carveout(rproc, mem);
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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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return ret;
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}
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notifyid = ret;
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/* Potentially bump max_notifyid */
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if (notifyid > rproc->max_notifyid)
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rproc->max_notifyid = notifyid;
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rvring->notifyid = notifyid;
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/* Let the rproc know the notifyid of this vring.*/
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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 0x%x, qsz %d, align %d\n",
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i, vring->da, vring->num, vring->align);
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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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struct rproc *rproc = rvring->rvdev->rproc;
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int idx = rvring - rvring->rvdev->vring;
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struct fw_rsc_vdev *rsc;
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idr_remove(&rproc->notifyids, rvring->notifyid);
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/*
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* At this point rproc_stop() has been called and the installed resource
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* table in the remote processor memory may no longer be accessible. As
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* such and as per rproc_stop(), rproc->table_ptr points to the cached
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* resource table (rproc->cached_table). The cached resource table is
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* only available when a remote processor has been booted by the
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* remoteproc core, otherwise it is NULL.
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*
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* Based on the above, reset the virtio device section in the cached
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* resource table only if there is one to work with.
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*/
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if (rproc->table_ptr) {
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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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static int rproc_vdev_do_start(struct rproc_subdev *subdev)
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{
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struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev);
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return rproc_add_virtio_dev(rvdev, rvdev->id);
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}
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static void rproc_vdev_do_stop(struct rproc_subdev *subdev, bool crashed)
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{
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struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev);
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int ret;
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ret = device_for_each_child(&rvdev->dev, NULL, rproc_remove_virtio_dev);
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if (ret)
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dev_warn(&rvdev->dev, "can't remove vdev child device: %d\n", ret);
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}
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/**
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* rproc_rvdev_release() - release the existence of a rvdev
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*
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* @dev: the subdevice's dev
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|
*/
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static void rproc_rvdev_release(struct device *dev)
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{
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struct rproc_vdev *rvdev = container_of(dev, struct rproc_vdev, dev);
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of_reserved_mem_device_release(dev);
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kfree(rvdev);
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}
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|
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static int copy_dma_range_map(struct device *to, struct device *from)
|
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{
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const struct bus_dma_region *map = from->dma_range_map, *new_map, *r;
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int num_ranges = 0;
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if (!map)
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return 0;
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for (r = map; r->size; r++)
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num_ranges++;
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new_map = kmemdup(map, array_size(num_ranges + 1, sizeof(*map)),
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GFP_KERNEL);
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if (!new_map)
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return -ENOMEM;
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to->dma_range_map = new_map;
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return 0;
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}
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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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* @ptr: the vring resource descriptor
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* @offset: offset of the resource entry
|
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* @avail: size of available data (for sanity checking the image)
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*
|
|
* This resource entry requests the host to statically register a virtio
|
|
* device (vdev), and setup everything needed to support it. It contains
|
|
* everything needed to make it possible: the virtio device id, virtio
|
|
* device features, vrings information, virtio config space, etc...
|
|
*
|
|
* Before registering the vdev, the vrings are allocated from non-cacheable
|
|
* physically contiguous memory. Currently we only support two vrings per
|
|
* remote processor (temporary limitation). We might also want to consider
|
|
* doing the vring allocation only later when ->find_vqs() is invoked, and
|
|
* then release them upon ->del_vqs().
|
|
*
|
|
* Note: @da is currently not really handled correctly: we dynamically
|
|
* allocate it using the DMA API, ignoring requested hard coded addresses,
|
|
* and we don't take care of any required IOMMU programming. This is all
|
|
* going to be taken care of when the generic iommu-based DMA API will be
|
|
* merged. Meanwhile, statically-addressed iommu-based firmware images should
|
|
* use RSC_DEVMEM resource entries to map their required @da to the physical
|
|
* address of their base CMA region (ouch, hacky!).
|
|
*
|
|
* Returns 0 on success, or an appropriate error code otherwise
|
|
*/
|
|
static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
|
|
int offset, int avail)
|
|
{
|
|
struct fw_rsc_vdev *rsc = ptr;
|
|
struct device *dev = &rproc->dev;
|
|
struct rproc_vdev *rvdev;
|
|
int i, ret;
|
|
char name[16];
|
|
|
|
/* make sure resource isn't truncated */
|
|
if (struct_size(rsc, vring, rsc->num_of_vrings) + rsc->config_len >
|
|
avail) {
|
|
dev_err(dev, "vdev rsc is truncated\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* make sure reserved bytes are zeroes */
|
|
if (rsc->reserved[0] || rsc->reserved[1]) {
|
|
dev_err(dev, "vdev rsc has non zero reserved bytes\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev_dbg(dev, "vdev rsc: id %d, dfeatures 0x%x, cfg len %d, %d vrings\n",
|
|
rsc->id, rsc->dfeatures, rsc->config_len, rsc->num_of_vrings);
|
|
|
|
/* we currently support only two vrings per rvdev */
|
|
if (rsc->num_of_vrings > ARRAY_SIZE(rvdev->vring)) {
|
|
dev_err(dev, "too many vrings: %d\n", rsc->num_of_vrings);
|
|
return -EINVAL;
|
|
}
|
|
|
|
rvdev = kzalloc(sizeof(*rvdev), GFP_KERNEL);
|
|
if (!rvdev)
|
|
return -ENOMEM;
|
|
|
|
kref_init(&rvdev->refcount);
|
|
|
|
rvdev->id = rsc->id;
|
|
rvdev->rproc = rproc;
|
|
rvdev->index = rproc->nb_vdev++;
|
|
|
|
/* Initialise vdev subdevice */
|
|
snprintf(name, sizeof(name), "vdev%dbuffer", rvdev->index);
|
|
rvdev->dev.parent = &rproc->dev;
|
|
ret = copy_dma_range_map(&rvdev->dev, rproc->dev.parent);
|
|
if (ret)
|
|
return ret;
|
|
rvdev->dev.release = rproc_rvdev_release;
|
|
dev_set_name(&rvdev->dev, "%s#%s", dev_name(rvdev->dev.parent), name);
|
|
dev_set_drvdata(&rvdev->dev, rvdev);
|
|
|
|
ret = device_register(&rvdev->dev);
|
|
if (ret) {
|
|
put_device(&rvdev->dev);
|
|
return ret;
|
|
}
|
|
/* Make device dma capable by inheriting from parent's capabilities */
|
|
set_dma_ops(&rvdev->dev, get_dma_ops(rproc->dev.parent));
|
|
|
|
ret = dma_coerce_mask_and_coherent(&rvdev->dev,
|
|
dma_get_mask(rproc->dev.parent));
|
|
if (ret) {
|
|
dev_warn(dev,
|
|
"Failed to set DMA mask %llx. Trying to continue... %x\n",
|
|
dma_get_mask(rproc->dev.parent), ret);
|
|
}
|
|
|
|
/* parse the vrings */
|
|
for (i = 0; i < rsc->num_of_vrings; i++) {
|
|
ret = rproc_parse_vring(rvdev, rsc, i);
|
|
if (ret)
|
|
goto free_rvdev;
|
|
}
|
|
|
|
/* remember the resource offset*/
|
|
rvdev->rsc_offset = offset;
|
|
|
|
/* allocate the vring resources */
|
|
for (i = 0; i < rsc->num_of_vrings; i++) {
|
|
ret = rproc_alloc_vring(rvdev, i);
|
|
if (ret)
|
|
goto unwind_vring_allocations;
|
|
}
|
|
|
|
list_add_tail(&rvdev->node, &rproc->rvdevs);
|
|
|
|
rvdev->subdev.start = rproc_vdev_do_start;
|
|
rvdev->subdev.stop = rproc_vdev_do_stop;
|
|
|
|
rproc_add_subdev(rproc, &rvdev->subdev);
|
|
|
|
return 0;
|
|
|
|
unwind_vring_allocations:
|
|
for (i--; i >= 0; i--)
|
|
rproc_free_vring(&rvdev->vring[i]);
|
|
free_rvdev:
|
|
device_unregister(&rvdev->dev);
|
|
return ret;
|
|
}
|
|
|
|
void rproc_vdev_release(struct kref *ref)
|
|
{
|
|
struct rproc_vdev *rvdev = container_of(ref, struct rproc_vdev, refcount);
|
|
struct rproc_vring *rvring;
|
|
struct rproc *rproc = rvdev->rproc;
|
|
int id;
|
|
|
|
for (id = 0; id < ARRAY_SIZE(rvdev->vring); id++) {
|
|
rvring = &rvdev->vring[id];
|
|
rproc_free_vring(rvring);
|
|
}
|
|
|
|
rproc_remove_subdev(rproc, &rvdev->subdev);
|
|
list_del(&rvdev->node);
|
|
device_unregister(&rvdev->dev);
|
|
}
|
|
|
|
/**
|
|
* rproc_handle_trace() - handle a shared trace buffer resource
|
|
* @rproc: the remote processor
|
|
* @ptr: the trace resource descriptor
|
|
* @offset: offset of the resource entry
|
|
* @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, void *ptr,
|
|
int offset, int avail)
|
|
{
|
|
struct fw_rsc_trace *rsc = ptr;
|
|
struct rproc_debug_trace *trace;
|
|
struct device *dev = &rproc->dev;
|
|
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;
|
|
}
|
|
|
|
trace = kzalloc(sizeof(*trace), GFP_KERNEL);
|
|
if (!trace)
|
|
return -ENOMEM;
|
|
|
|
/* set the trace buffer dma properties */
|
|
trace->trace_mem.len = rsc->len;
|
|
trace->trace_mem.da = rsc->da;
|
|
|
|
/* set pointer on rproc device */
|
|
trace->rproc = rproc;
|
|
|
|
/* make sure snprintf always null terminates, even if truncating */
|
|
snprintf(name, sizeof(name), "trace%d", rproc->num_traces);
|
|
|
|
/* create the debugfs entry */
|
|
trace->tfile = rproc_create_trace_file(name, rproc, trace);
|
|
if (!trace->tfile) {
|
|
kfree(trace);
|
|
return -EINVAL;
|
|
}
|
|
|
|
list_add_tail(&trace->node, &rproc->traces);
|
|
|
|
rproc->num_traces++;
|
|
|
|
dev_dbg(dev, "%s added: da 0x%x, len 0x%x\n",
|
|
name, rsc->da, rsc->len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* rproc_handle_devmem() - handle devmem resource entry
|
|
* @rproc: remote processor handle
|
|
* @ptr: the devmem resource entry
|
|
* @offset: offset of the 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, void *ptr,
|
|
int offset, int avail)
|
|
{
|
|
struct fw_rsc_devmem *rsc = ptr;
|
|
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_alloc_carveout() - allocated specified carveout
|
|
* @rproc: rproc handle
|
|
* @mem: the memory entry to allocate
|
|
*
|
|
* This function allocate specified memory entry @mem using
|
|
* dma_alloc_coherent() as default allocator
|
|
*/
|
|
static int rproc_alloc_carveout(struct rproc *rproc,
|
|
struct rproc_mem_entry *mem)
|
|
{
|
|
struct rproc_mem_entry *mapping = NULL;
|
|
struct device *dev = &rproc->dev;
|
|
dma_addr_t dma;
|
|
void *va;
|
|
int ret;
|
|
|
|
va = dma_alloc_coherent(dev->parent, mem->len, &dma, GFP_KERNEL);
|
|
if (!va) {
|
|
dev_err(dev->parent,
|
|
"failed to allocate dma memory: len 0x%zx\n",
|
|
mem->len);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
dev_dbg(dev, "carveout va %pK, dma %pad, len 0x%zx\n",
|
|
va, &dma, mem->len);
|
|
|
|
if (mem->da != FW_RSC_ADDR_ANY && !rproc->domain) {
|
|
/*
|
|
* Check requested da is equal to dma address
|
|
* and print a warn message in case of missalignment.
|
|
* Don't stop rproc_start sequence as coprocessor may
|
|
* build pa to da translation on its side.
|
|
*/
|
|
if (mem->da != (u32)dma)
|
|
dev_warn(dev->parent,
|
|
"Allocated carveout doesn't fit device address request\n");
|
|
}
|
|
|
|
/*
|
|
* 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 (mem->da != FW_RSC_ADDR_ANY && rproc->domain) {
|
|
mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
|
|
if (!mapping) {
|
|
ret = -ENOMEM;
|
|
goto dma_free;
|
|
}
|
|
|
|
ret = iommu_map(rproc->domain, mem->da, dma, mem->len,
|
|
mem->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 = mem->da;
|
|
mapping->len = mem->len;
|
|
list_add_tail(&mapping->node, &rproc->mappings);
|
|
|
|
dev_dbg(dev, "carveout mapped 0x%x to %pad\n",
|
|
mem->da, &dma);
|
|
}
|
|
|
|
if (mem->da == FW_RSC_ADDR_ANY) {
|
|
/* Update device address as undefined by requester */
|
|
if ((u64)dma & HIGH_BITS_MASK)
|
|
dev_warn(dev, "DMA address cast in 32bit to fit resource table format\n");
|
|
|
|
mem->da = (u32)dma;
|
|
}
|
|
|
|
mem->dma = dma;
|
|
mem->va = va;
|
|
|
|
return 0;
|
|
|
|
free_mapping:
|
|
kfree(mapping);
|
|
dma_free:
|
|
dma_free_coherent(dev->parent, mem->len, va, dma);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* rproc_release_carveout() - release acquired carveout
|
|
* @rproc: rproc handle
|
|
* @mem: the memory entry to release
|
|
*
|
|
* This function releases specified memory entry @mem allocated via
|
|
* rproc_alloc_carveout() function by @rproc.
|
|
*/
|
|
static int rproc_release_carveout(struct rproc *rproc,
|
|
struct rproc_mem_entry *mem)
|
|
{
|
|
struct device *dev = &rproc->dev;
|
|
|
|
/* clean up carveout allocations */
|
|
dma_free_coherent(dev->parent, mem->len, mem->va, mem->dma);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* rproc_handle_carveout() - handle phys contig memory allocation requests
|
|
* @rproc: rproc handle
|
|
* @ptr: the resource entry
|
|
* @offset: offset of 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,
|
|
void *ptr, int offset, int avail)
|
|
{
|
|
struct fw_rsc_carveout *rsc = ptr;
|
|
struct rproc_mem_entry *carveout;
|
|
struct device *dev = &rproc->dev;
|
|
|
|
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: name: %s, da 0x%x, pa 0x%x, len 0x%x, flags 0x%x\n",
|
|
rsc->name, rsc->da, rsc->pa, rsc->len, rsc->flags);
|
|
|
|
/*
|
|
* Check carveout rsc already part of a registered carveout,
|
|
* Search by name, then check the da and length
|
|
*/
|
|
carveout = rproc_find_carveout_by_name(rproc, rsc->name);
|
|
|
|
if (carveout) {
|
|
if (carveout->rsc_offset != FW_RSC_ADDR_ANY) {
|
|
dev_err(dev,
|
|
"Carveout already associated to resource table\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (rproc_check_carveout_da(rproc, carveout, rsc->da, rsc->len))
|
|
return -ENOMEM;
|
|
|
|
/* Update memory carveout with resource table info */
|
|
carveout->rsc_offset = offset;
|
|
carveout->flags = rsc->flags;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Register carveout in in list */
|
|
carveout = rproc_mem_entry_init(dev, NULL, 0, rsc->len, rsc->da,
|
|
rproc_alloc_carveout,
|
|
rproc_release_carveout, rsc->name);
|
|
if (!carveout) {
|
|
dev_err(dev, "Can't allocate memory entry structure\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
carveout->flags = rsc->flags;
|
|
carveout->rsc_offset = offset;
|
|
rproc_add_carveout(rproc, carveout);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* rproc_add_carveout() - register an allocated carveout region
|
|
* @rproc: rproc handle
|
|
* @mem: memory entry to register
|
|
*
|
|
* This function registers specified memory entry in @rproc carveouts list.
|
|
* Specified carveout should have been allocated before registering.
|
|
*/
|
|
void rproc_add_carveout(struct rproc *rproc, struct rproc_mem_entry *mem)
|
|
{
|
|
list_add_tail(&mem->node, &rproc->carveouts);
|
|
}
|
|
EXPORT_SYMBOL(rproc_add_carveout);
|
|
|
|
/**
|
|
* rproc_mem_entry_init() - allocate and initialize rproc_mem_entry struct
|
|
* @dev: pointer on device struct
|
|
* @va: virtual address
|
|
* @dma: dma address
|
|
* @len: memory carveout length
|
|
* @da: device address
|
|
* @alloc: memory carveout allocation function
|
|
* @release: memory carveout release function
|
|
* @name: carveout name
|
|
*
|
|
* This function allocates a rproc_mem_entry struct and fill it with parameters
|
|
* provided by client.
|
|
*/
|
|
__printf(8, 9)
|
|
struct rproc_mem_entry *
|
|
rproc_mem_entry_init(struct device *dev,
|
|
void *va, dma_addr_t dma, size_t len, u32 da,
|
|
int (*alloc)(struct rproc *, struct rproc_mem_entry *),
|
|
int (*release)(struct rproc *, struct rproc_mem_entry *),
|
|
const char *name, ...)
|
|
{
|
|
struct rproc_mem_entry *mem;
|
|
va_list args;
|
|
|
|
mem = kzalloc(sizeof(*mem), GFP_KERNEL);
|
|
if (!mem)
|
|
return mem;
|
|
|
|
mem->va = va;
|
|
mem->dma = dma;
|
|
mem->da = da;
|
|
mem->len = len;
|
|
mem->alloc = alloc;
|
|
mem->release = release;
|
|
mem->rsc_offset = FW_RSC_ADDR_ANY;
|
|
mem->of_resm_idx = -1;
|
|
|
|
va_start(args, name);
|
|
vsnprintf(mem->name, sizeof(mem->name), name, args);
|
|
va_end(args);
|
|
|
|
return mem;
|
|
}
|
|
EXPORT_SYMBOL(rproc_mem_entry_init);
|
|
|
|
/**
|
|
* rproc_of_resm_mem_entry_init() - allocate and initialize rproc_mem_entry struct
|
|
* from a reserved memory phandle
|
|
* @dev: pointer on device struct
|
|
* @of_resm_idx: reserved memory phandle index in "memory-region"
|
|
* @len: memory carveout length
|
|
* @da: device address
|
|
* @name: carveout name
|
|
*
|
|
* This function allocates a rproc_mem_entry struct and fill it with parameters
|
|
* provided by client.
|
|
*/
|
|
__printf(5, 6)
|
|
struct rproc_mem_entry *
|
|
rproc_of_resm_mem_entry_init(struct device *dev, u32 of_resm_idx, size_t len,
|
|
u32 da, const char *name, ...)
|
|
{
|
|
struct rproc_mem_entry *mem;
|
|
va_list args;
|
|
|
|
mem = kzalloc(sizeof(*mem), GFP_KERNEL);
|
|
if (!mem)
|
|
return mem;
|
|
|
|
mem->da = da;
|
|
mem->len = len;
|
|
mem->rsc_offset = FW_RSC_ADDR_ANY;
|
|
mem->of_resm_idx = of_resm_idx;
|
|
|
|
va_start(args, name);
|
|
vsnprintf(mem->name, sizeof(mem->name), name, args);
|
|
va_end(args);
|
|
|
|
return mem;
|
|
}
|
|
EXPORT_SYMBOL(rproc_of_resm_mem_entry_init);
|
|
|
|
/**
|
|
* rproc_of_parse_firmware() - parse and return the firmware-name
|
|
* @dev: pointer on device struct representing a rproc
|
|
* @index: index to use for the firmware-name retrieval
|
|
* @fw_name: pointer to a character string, in which the firmware
|
|
* name is returned on success and unmodified otherwise.
|
|
*
|
|
* This is an OF helper function that parses a device's DT node for
|
|
* the "firmware-name" property and returns the firmware name pointer
|
|
* in @fw_name on success.
|
|
*
|
|
* Return: 0 on success, or an appropriate failure.
|
|
*/
|
|
int rproc_of_parse_firmware(struct device *dev, int index, const char **fw_name)
|
|
{
|
|
int ret;
|
|
|
|
ret = of_property_read_string_index(dev->of_node, "firmware-name",
|
|
index, fw_name);
|
|
return ret ? ret : 0;
|
|
}
|
|
EXPORT_SYMBOL(rproc_of_parse_firmware);
|
|
|
|
/*
|
|
* 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_carveout,
|
|
[RSC_DEVMEM] = rproc_handle_devmem,
|
|
[RSC_TRACE] = rproc_handle_trace,
|
|
[RSC_VDEV] = rproc_handle_vdev,
|
|
};
|
|
|
|
/* handle firmware resource entries before booting the remote processor */
|
|
static int rproc_handle_resources(struct rproc *rproc,
|
|
rproc_handle_resource_t handlers[RSC_LAST])
|
|
{
|
|
struct device *dev = &rproc->dev;
|
|
rproc_handle_resource_t handler;
|
|
int ret = 0, i;
|
|
|
|
if (!rproc->table_ptr)
|
|
return 0;
|
|
|
|
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 = rproc->table_sz - 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_VENDOR_START &&
|
|
hdr->type <= RSC_VENDOR_END) {
|
|
ret = rproc_handle_rsc(rproc, hdr->type, rsc,
|
|
offset + sizeof(*hdr), avail);
|
|
if (ret == RSC_HANDLED)
|
|
continue;
|
|
else if (ret < 0)
|
|
break;
|
|
|
|
dev_warn(dev, "unsupported vendor resource %d\n",
|
|
hdr->type);
|
|
continue;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static int rproc_prepare_subdevices(struct rproc *rproc)
|
|
{
|
|
struct rproc_subdev *subdev;
|
|
int ret;
|
|
|
|
list_for_each_entry(subdev, &rproc->subdevs, node) {
|
|
if (subdev->prepare) {
|
|
ret = subdev->prepare(subdev);
|
|
if (ret)
|
|
goto unroll_preparation;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
unroll_preparation:
|
|
list_for_each_entry_continue_reverse(subdev, &rproc->subdevs, node) {
|
|
if (subdev->unprepare)
|
|
subdev->unprepare(subdev);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rproc_start_subdevices(struct rproc *rproc)
|
|
{
|
|
struct rproc_subdev *subdev;
|
|
int ret;
|
|
|
|
list_for_each_entry(subdev, &rproc->subdevs, node) {
|
|
if (subdev->start) {
|
|
ret = subdev->start(subdev);
|
|
if (ret)
|
|
goto unroll_registration;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
unroll_registration:
|
|
list_for_each_entry_continue_reverse(subdev, &rproc->subdevs, node) {
|
|
if (subdev->stop)
|
|
subdev->stop(subdev, true);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void rproc_stop_subdevices(struct rproc *rproc, bool crashed)
|
|
{
|
|
struct rproc_subdev *subdev;
|
|
|
|
list_for_each_entry_reverse(subdev, &rproc->subdevs, node) {
|
|
if (subdev->stop)
|
|
subdev->stop(subdev, crashed);
|
|
}
|
|
}
|
|
|
|
static void rproc_unprepare_subdevices(struct rproc *rproc)
|
|
{
|
|
struct rproc_subdev *subdev;
|
|
|
|
list_for_each_entry_reverse(subdev, &rproc->subdevs, node) {
|
|
if (subdev->unprepare)
|
|
subdev->unprepare(subdev);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* rproc_alloc_registered_carveouts() - allocate all carveouts registered
|
|
* in the list
|
|
* @rproc: the remote processor handle
|
|
*
|
|
* This function parses registered carveout list, performs allocation
|
|
* if alloc() ops registered and updates resource table information
|
|
* if rsc_offset set.
|
|
*
|
|
* Return: 0 on success
|
|
*/
|
|
static int rproc_alloc_registered_carveouts(struct rproc *rproc)
|
|
{
|
|
struct rproc_mem_entry *entry, *tmp;
|
|
struct fw_rsc_carveout *rsc;
|
|
struct device *dev = &rproc->dev;
|
|
u64 pa;
|
|
int ret;
|
|
|
|
list_for_each_entry_safe(entry, tmp, &rproc->carveouts, node) {
|
|
if (entry->alloc) {
|
|
ret = entry->alloc(rproc, entry);
|
|
if (ret) {
|
|
dev_err(dev, "Unable to allocate carveout %s: %d\n",
|
|
entry->name, ret);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
if (entry->rsc_offset != FW_RSC_ADDR_ANY) {
|
|
/* update resource table */
|
|
rsc = (void *)rproc->table_ptr + entry->rsc_offset;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
/* Use va if defined else dma to generate pa */
|
|
if (entry->va)
|
|
pa = (u64)rproc_va_to_pa(entry->va);
|
|
else
|
|
pa = (u64)entry->dma;
|
|
|
|
if (((u64)pa) & HIGH_BITS_MASK)
|
|
dev_warn(dev,
|
|
"Physical address cast in 32bit to fit resource table format\n");
|
|
|
|
rsc->pa = (u32)pa;
|
|
rsc->da = entry->da;
|
|
rsc->len = entry->len;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
void rproc_resource_cleanup(struct rproc *rproc)
|
|
{
|
|
struct rproc_mem_entry *entry, *tmp;
|
|
struct rproc_debug_trace *trace, *ttmp;
|
|
struct rproc_vdev *rvdev, *rvtmp;
|
|
struct device *dev = &rproc->dev;
|
|
|
|
/* clean up debugfs trace entries */
|
|
list_for_each_entry_safe(trace, ttmp, &rproc->traces, node) {
|
|
rproc_remove_trace_file(trace->tfile);
|
|
rproc->num_traces--;
|
|
list_del(&trace->node);
|
|
kfree(trace);
|
|
}
|
|
|
|
/* 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 %zx/%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) {
|
|
if (entry->release)
|
|
entry->release(rproc, entry);
|
|
list_del(&entry->node);
|
|
kfree(entry);
|
|
}
|
|
|
|
/* clean up remote vdev entries */
|
|
list_for_each_entry_safe(rvdev, rvtmp, &rproc->rvdevs, node)
|
|
kref_put(&rvdev->refcount, rproc_vdev_release);
|
|
|
|
rproc_coredump_cleanup(rproc);
|
|
}
|
|
EXPORT_SYMBOL(rproc_resource_cleanup);
|
|
|
|
static int rproc_start(struct rproc *rproc, const struct firmware *fw)
|
|
{
|
|
struct resource_table *loaded_table;
|
|
struct device *dev = &rproc->dev;
|
|
int ret;
|
|
|
|
/* 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);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* 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. We also update the table_ptr so
|
|
* that any subsequent changes will be applied to the loaded version.
|
|
*/
|
|
loaded_table = rproc_find_loaded_rsc_table(rproc, fw);
|
|
if (loaded_table) {
|
|
memcpy(loaded_table, rproc->cached_table, rproc->table_sz);
|
|
rproc->table_ptr = loaded_table;
|
|
}
|
|
|
|
ret = rproc_prepare_subdevices(rproc);
|
|
if (ret) {
|
|
dev_err(dev, "failed to prepare subdevices for %s: %d\n",
|
|
rproc->name, ret);
|
|
goto reset_table_ptr;
|
|
}
|
|
|
|
/* 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 unprepare_subdevices;
|
|
}
|
|
|
|
/* Start any subdevices for the remote processor */
|
|
ret = rproc_start_subdevices(rproc);
|
|
if (ret) {
|
|
dev_err(dev, "failed to probe subdevices for %s: %d\n",
|
|
rproc->name, ret);
|
|
goto stop_rproc;
|
|
}
|
|
|
|
rproc->state = RPROC_RUNNING;
|
|
|
|
dev_info(dev, "remote processor %s is now up\n", rproc->name);
|
|
|
|
return 0;
|
|
|
|
stop_rproc:
|
|
rproc->ops->stop(rproc);
|
|
unprepare_subdevices:
|
|
rproc_unprepare_subdevices(rproc);
|
|
reset_table_ptr:
|
|
rproc->table_ptr = rproc->cached_table;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __rproc_attach(struct rproc *rproc)
|
|
{
|
|
struct device *dev = &rproc->dev;
|
|
int ret;
|
|
|
|
ret = rproc_prepare_subdevices(rproc);
|
|
if (ret) {
|
|
dev_err(dev, "failed to prepare subdevices for %s: %d\n",
|
|
rproc->name, ret);
|
|
goto out;
|
|
}
|
|
|
|
/* Attach to the remote processor */
|
|
ret = rproc_attach_device(rproc);
|
|
if (ret) {
|
|
dev_err(dev, "can't attach to rproc %s: %d\n",
|
|
rproc->name, ret);
|
|
goto unprepare_subdevices;
|
|
}
|
|
|
|
/* Start any subdevices for the remote processor */
|
|
ret = rproc_start_subdevices(rproc);
|
|
if (ret) {
|
|
dev_err(dev, "failed to probe subdevices for %s: %d\n",
|
|
rproc->name, ret);
|
|
goto stop_rproc;
|
|
}
|
|
|
|
rproc->state = RPROC_ATTACHED;
|
|
|
|
dev_info(dev, "remote processor %s is now attached\n", rproc->name);
|
|
|
|
return 0;
|
|
|
|
stop_rproc:
|
|
rproc->ops->stop(rproc);
|
|
unprepare_subdevices:
|
|
rproc_unprepare_subdevices(rproc);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
int ret;
|
|
|
|
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;
|
|
}
|
|
|
|
/* Prepare rproc for firmware loading if needed */
|
|
ret = rproc_prepare_device(rproc);
|
|
if (ret) {
|
|
dev_err(dev, "can't prepare rproc %s: %d\n", rproc->name, ret);
|
|
goto disable_iommu;
|
|
}
|
|
|
|
rproc->bootaddr = rproc_get_boot_addr(rproc, fw);
|
|
|
|
/* Load resource table, core dump segment list etc from the firmware */
|
|
ret = rproc_parse_fw(rproc, fw);
|
|
if (ret)
|
|
goto unprepare_rproc;
|
|
|
|
/* reset max_notifyid */
|
|
rproc->max_notifyid = -1;
|
|
|
|
/* reset handled vdev */
|
|
rproc->nb_vdev = 0;
|
|
|
|
/* handle fw resources which are required to boot rproc */
|
|
ret = rproc_handle_resources(rproc, rproc_loading_handlers);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to process resources: %d\n", ret);
|
|
goto clean_up_resources;
|
|
}
|
|
|
|
/* Allocate carveout resources associated to rproc */
|
|
ret = rproc_alloc_registered_carveouts(rproc);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to allocate associated carveouts: %d\n",
|
|
ret);
|
|
goto clean_up_resources;
|
|
}
|
|
|
|
ret = rproc_start(rproc, fw);
|
|
if (ret)
|
|
goto clean_up_resources;
|
|
|
|
return 0;
|
|
|
|
clean_up_resources:
|
|
rproc_resource_cleanup(rproc);
|
|
kfree(rproc->cached_table);
|
|
rproc->cached_table = NULL;
|
|
rproc->table_ptr = NULL;
|
|
unprepare_rproc:
|
|
/* release HW resources if needed */
|
|
rproc_unprepare_device(rproc);
|
|
disable_iommu:
|
|
rproc_disable_iommu(rproc);
|
|
return ret;
|
|
}
|
|
|
|
static int rproc_set_rsc_table(struct rproc *rproc)
|
|
{
|
|
struct resource_table *table_ptr;
|
|
struct device *dev = &rproc->dev;
|
|
size_t table_sz;
|
|
int ret;
|
|
|
|
table_ptr = rproc_get_loaded_rsc_table(rproc, &table_sz);
|
|
if (!table_ptr) {
|
|
/* Not having a resource table is acceptable */
|
|
return 0;
|
|
}
|
|
|
|
if (IS_ERR(table_ptr)) {
|
|
ret = PTR_ERR(table_ptr);
|
|
dev_err(dev, "can't load resource table: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* If it is possible to detach the remote processor, keep an untouched
|
|
* copy of the resource table. That way we can start fresh again when
|
|
* the remote processor is re-attached, that is:
|
|
*
|
|
* DETACHED -> ATTACHED -> DETACHED -> ATTACHED
|
|
*
|
|
* Free'd in rproc_reset_rsc_table_on_detach() and
|
|
* rproc_reset_rsc_table_on_stop().
|
|
*/
|
|
if (rproc->ops->detach) {
|
|
rproc->clean_table = kmemdup(table_ptr, table_sz, GFP_KERNEL);
|
|
if (!rproc->clean_table)
|
|
return -ENOMEM;
|
|
} else {
|
|
rproc->clean_table = NULL;
|
|
}
|
|
|
|
rproc->cached_table = NULL;
|
|
rproc->table_ptr = table_ptr;
|
|
rproc->table_sz = table_sz;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rproc_reset_rsc_table_on_detach(struct rproc *rproc)
|
|
{
|
|
struct resource_table *table_ptr;
|
|
|
|
/* A resource table was never retrieved, nothing to do here */
|
|
if (!rproc->table_ptr)
|
|
return 0;
|
|
|
|
/*
|
|
* If we made it to this point a clean_table _must_ have been
|
|
* allocated in rproc_set_rsc_table(). If one isn't present
|
|
* something went really wrong and we must complain.
|
|
*/
|
|
if (WARN_ON(!rproc->clean_table))
|
|
return -EINVAL;
|
|
|
|
/* Remember where the external entity installed the resource table */
|
|
table_ptr = rproc->table_ptr;
|
|
|
|
/*
|
|
* If we made it here the remote processor was started by another
|
|
* entity and a cache table doesn't exist. As such make a copy of
|
|
* the resource table currently used by the remote processor and
|
|
* use that for the rest of the shutdown process. The memory
|
|
* allocated here is free'd in rproc_detach().
|
|
*/
|
|
rproc->cached_table = kmemdup(rproc->table_ptr,
|
|
rproc->table_sz, GFP_KERNEL);
|
|
if (!rproc->cached_table)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Use a copy of the resource table for the remainder of the
|
|
* shutdown process.
|
|
*/
|
|
rproc->table_ptr = rproc->cached_table;
|
|
|
|
/*
|
|
* Reset the memory area where the firmware loaded the resource table
|
|
* to its original value. That way when we re-attach the remote
|
|
* processor the resource table is clean and ready to be used again.
|
|
*/
|
|
memcpy(table_ptr, rproc->clean_table, rproc->table_sz);
|
|
|
|
/*
|
|
* The clean resource table is no longer needed. Allocated in
|
|
* rproc_set_rsc_table().
|
|
*/
|
|
kfree(rproc->clean_table);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rproc_reset_rsc_table_on_stop(struct rproc *rproc)
|
|
{
|
|
/* A resource table was never retrieved, nothing to do here */
|
|
if (!rproc->table_ptr)
|
|
return 0;
|
|
|
|
/*
|
|
* If a cache table exists the remote processor was started by
|
|
* the remoteproc core. That cache table should be used for
|
|
* the rest of the shutdown process.
|
|
*/
|
|
if (rproc->cached_table)
|
|
goto out;
|
|
|
|
/*
|
|
* If we made it here the remote processor was started by another
|
|
* entity and a cache table doesn't exist. As such make a copy of
|
|
* the resource table currently used by the remote processor and
|
|
* use that for the rest of the shutdown process. The memory
|
|
* allocated here is free'd in rproc_shutdown().
|
|
*/
|
|
rproc->cached_table = kmemdup(rproc->table_ptr,
|
|
rproc->table_sz, GFP_KERNEL);
|
|
if (!rproc->cached_table)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Since the remote processor is being switched off the clean table
|
|
* won't be needed. Allocated in rproc_set_rsc_table().
|
|
*/
|
|
kfree(rproc->clean_table);
|
|
|
|
out:
|
|
/*
|
|
* Use a copy of the resource table for the remainder of the
|
|
* shutdown process.
|
|
*/
|
|
rproc->table_ptr = rproc->cached_table;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Attach to remote processor - similar to rproc_fw_boot() but without
|
|
* the steps that deal with the firmware image.
|
|
*/
|
|
static int rproc_attach(struct rproc *rproc)
|
|
{
|
|
struct device *dev = &rproc->dev;
|
|
int ret;
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
/* Do anything that is needed to boot the remote processor */
|
|
ret = rproc_prepare_device(rproc);
|
|
if (ret) {
|
|
dev_err(dev, "can't prepare rproc %s: %d\n", rproc->name, ret);
|
|
goto disable_iommu;
|
|
}
|
|
|
|
ret = rproc_set_rsc_table(rproc);
|
|
if (ret) {
|
|
dev_err(dev, "can't load resource table: %d\n", ret);
|
|
goto unprepare_device;
|
|
}
|
|
|
|
/* reset max_notifyid */
|
|
rproc->max_notifyid = -1;
|
|
|
|
/* reset handled vdev */
|
|
rproc->nb_vdev = 0;
|
|
|
|
/*
|
|
* Handle firmware resources required to attach to a remote processor.
|
|
* Because we are attaching rather than booting the remote processor,
|
|
* we expect the platform driver to properly set rproc->table_ptr.
|
|
*/
|
|
ret = rproc_handle_resources(rproc, rproc_loading_handlers);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to process resources: %d\n", ret);
|
|
goto unprepare_device;
|
|
}
|
|
|
|
/* Allocate carveout resources associated to rproc */
|
|
ret = rproc_alloc_registered_carveouts(rproc);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to allocate associated carveouts: %d\n",
|
|
ret);
|
|
goto clean_up_resources;
|
|
}
|
|
|
|
ret = __rproc_attach(rproc);
|
|
if (ret)
|
|
goto clean_up_resources;
|
|
|
|
return 0;
|
|
|
|
clean_up_resources:
|
|
rproc_resource_cleanup(rproc);
|
|
unprepare_device:
|
|
/* release HW resources if needed */
|
|
rproc_unprepare_device(rproc);
|
|
disable_iommu:
|
|
rproc_disable_iommu(rproc);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* take a firmware and boot it up.
|
|
*
|
|
* 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_auto_boot_callback(const struct firmware *fw, void *context)
|
|
{
|
|
struct rproc *rproc = context;
|
|
|
|
rproc_boot(rproc);
|
|
|
|
release_firmware(fw);
|
|
}
|
|
|
|
static int rproc_trigger_auto_boot(struct rproc *rproc)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* Since the remote processor is in a detached state, it has already
|
|
* been booted by another entity. As such there is no point in waiting
|
|
* for a firmware image to be loaded, we can simply initiate the process
|
|
* of attaching to it immediately.
|
|
*/
|
|
if (rproc->state == RPROC_DETACHED)
|
|
return rproc_boot(rproc);
|
|
|
|
/*
|
|
* 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_auto_boot_callback);
|
|
if (ret < 0)
|
|
dev_err(&rproc->dev, "request_firmware_nowait err: %d\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rproc_stop(struct rproc *rproc, bool crashed)
|
|
{
|
|
struct device *dev = &rproc->dev;
|
|
int ret;
|
|
|
|
/* No need to continue if a stop() operation has not been provided */
|
|
if (!rproc->ops->stop)
|
|
return -EINVAL;
|
|
|
|
/* Stop any subdevices for the remote processor */
|
|
rproc_stop_subdevices(rproc, crashed);
|
|
|
|
/* the installed resource table is no longer accessible */
|
|
ret = rproc_reset_rsc_table_on_stop(rproc);
|
|
if (ret) {
|
|
dev_err(dev, "can't reset resource table: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
|
|
/* power off the remote processor */
|
|
ret = rproc->ops->stop(rproc);
|
|
if (ret) {
|
|
dev_err(dev, "can't stop rproc: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
rproc_unprepare_subdevices(rproc);
|
|
|
|
rproc->state = RPROC_OFFLINE;
|
|
|
|
dev_info(dev, "stopped remote processor %s\n", rproc->name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* __rproc_detach(): Does the opposite of __rproc_attach()
|
|
*/
|
|
static int __rproc_detach(struct rproc *rproc)
|
|
{
|
|
struct device *dev = &rproc->dev;
|
|
int ret;
|
|
|
|
/* No need to continue if a detach() operation has not been provided */
|
|
if (!rproc->ops->detach)
|
|
return -EINVAL;
|
|
|
|
/* Stop any subdevices for the remote processor */
|
|
rproc_stop_subdevices(rproc, false);
|
|
|
|
/* the installed resource table is no longer accessible */
|
|
ret = rproc_reset_rsc_table_on_detach(rproc);
|
|
if (ret) {
|
|
dev_err(dev, "can't reset resource table: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* Tell the remote processor the core isn't available anymore */
|
|
ret = rproc->ops->detach(rproc);
|
|
if (ret) {
|
|
dev_err(dev, "can't detach from rproc: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
rproc_unprepare_subdevices(rproc);
|
|
|
|
rproc->state = RPROC_DETACHED;
|
|
|
|
dev_info(dev, "detached remote processor %s\n", rproc->name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* rproc_trigger_recovery() - recover a remoteproc
|
|
* @rproc: the remote processor
|
|
*
|
|
* The recovery is done by resetting 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)
|
|
{
|
|
const struct firmware *firmware_p;
|
|
struct device *dev = &rproc->dev;
|
|
int ret;
|
|
|
|
ret = mutex_lock_interruptible(&rproc->lock);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* State could have changed before we got the mutex */
|
|
if (rproc->state != RPROC_CRASHED)
|
|
goto unlock_mutex;
|
|
|
|
dev_err(dev, "recovering %s\n", rproc->name);
|
|
|
|
ret = rproc_stop(rproc, true);
|
|
if (ret)
|
|
goto unlock_mutex;
|
|
|
|
/* generate coredump */
|
|
rproc->ops->coredump(rproc);
|
|
|
|
/* load firmware */
|
|
ret = request_firmware(&firmware_p, rproc->firmware, dev);
|
|
if (ret < 0) {
|
|
dev_err(dev, "request_firmware failed: %d\n", ret);
|
|
goto unlock_mutex;
|
|
}
|
|
|
|
/* boot the remote processor up again */
|
|
ret = rproc_start(rproc, firmware_p);
|
|
|
|
release_firmware(firmware_p);
|
|
|
|
unlock_mutex:
|
|
mutex_unlock(&rproc->lock);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* rproc_crash_handler_work() - handle a crash
|
|
* @work: work treating the 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);
|
|
|
|
pm_relax(rproc->dev.parent);
|
|
}
|
|
|
|
/**
|
|
* rproc_boot() - boot a remote processor
|
|
* @rproc: handle of a remote processor
|
|
*
|
|
* 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.
|
|
*/
|
|
int rproc_boot(struct rproc *rproc)
|
|
{
|
|
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;
|
|
}
|
|
|
|
if (rproc->state == RPROC_DELETED) {
|
|
ret = -ENODEV;
|
|
dev_err(dev, "can't boot deleted rproc %s\n", rproc->name);
|
|
goto unlock_mutex;
|
|
}
|
|
|
|
/* skip the boot or attach process if rproc is already powered up */
|
|
if (atomic_inc_return(&rproc->power) > 1) {
|
|
ret = 0;
|
|
goto unlock_mutex;
|
|
}
|
|
|
|
if (rproc->state == RPROC_DETACHED) {
|
|
dev_info(dev, "attaching to %s\n", rproc->name);
|
|
|
|
ret = rproc_attach(rproc);
|
|
} else {
|
|
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;
|
|
}
|
|
|
|
ret = rproc_fw_boot(rproc, firmware_p);
|
|
|
|
release_firmware(firmware_p);
|
|
}
|
|
|
|
downref_rproc:
|
|
if (ret)
|
|
atomic_dec(&rproc->power);
|
|
unlock_mutex:
|
|
mutex_unlock(&rproc->lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(rproc_boot);
|
|
|
|
/**
|
|
* 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;
|
|
|
|
ret = rproc_stop(rproc, false);
|
|
if (ret) {
|
|
atomic_inc(&rproc->power);
|
|
goto out;
|
|
}
|
|
|
|
/* clean up all acquired resources */
|
|
rproc_resource_cleanup(rproc);
|
|
|
|
/* release HW resources if needed */
|
|
rproc_unprepare_device(rproc);
|
|
|
|
rproc_disable_iommu(rproc);
|
|
|
|
/* Free the copy of the resource table */
|
|
kfree(rproc->cached_table);
|
|
rproc->cached_table = NULL;
|
|
rproc->table_ptr = NULL;
|
|
out:
|
|
mutex_unlock(&rproc->lock);
|
|
}
|
|
EXPORT_SYMBOL(rproc_shutdown);
|
|
|
|
/**
|
|
* rproc_detach() - Detach the remote processor from the
|
|
* remoteproc core
|
|
*
|
|
* @rproc: the remote processor
|
|
*
|
|
* Detach a remote processor (previously attached to with rproc_attach()).
|
|
*
|
|
* In case @rproc is still being used by an additional user(s), then
|
|
* this function will just decrement the power refcount and exit,
|
|
* without disconnecting the device.
|
|
*
|
|
* Function rproc_detach() calls __rproc_detach() in order to let a remote
|
|
* processor know that services provided by the application processor are
|
|
* no longer available. From there it should be possible to remove the
|
|
* platform driver and even power cycle the application processor (if the HW
|
|
* supports it) without needing to switch off the remote processor.
|
|
*/
|
|
int rproc_detach(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 ret;
|
|
}
|
|
|
|
/* if the remote proc is still needed, bail out */
|
|
if (!atomic_dec_and_test(&rproc->power)) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
ret = __rproc_detach(rproc);
|
|
if (ret) {
|
|
atomic_inc(&rproc->power);
|
|
goto out;
|
|
}
|
|
|
|
/* clean up all acquired resources */
|
|
rproc_resource_cleanup(rproc);
|
|
|
|
/* release HW resources if needed */
|
|
rproc_unprepare_device(rproc);
|
|
|
|
rproc_disable_iommu(rproc);
|
|
|
|
/* Free the copy of the resource table */
|
|
kfree(rproc->cached_table);
|
|
rproc->cached_table = NULL;
|
|
rproc->table_ptr = NULL;
|
|
out:
|
|
mutex_unlock(&rproc->lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(rproc_detach);
|
|
|
|
/**
|
|
* 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;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(r, &rproc_list, node) {
|
|
if (r->dev.parent && r->dev.parent->of_node == np) {
|
|
/* prevent underlying implementation from being removed */
|
|
if (!try_module_get(r->dev.parent->driver->owner)) {
|
|
dev_err(&r->dev, "can't get owner\n");
|
|
break;
|
|
}
|
|
|
|
rproc = r;
|
|
get_device(&rproc->dev);
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
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_set_firmware() - assign a new firmware
|
|
* @rproc: rproc handle to which the new firmware is being assigned
|
|
* @fw_name: new firmware name to be assigned
|
|
*
|
|
* This function allows remoteproc drivers or clients to configure a custom
|
|
* firmware name that is different from the default name used during remoteproc
|
|
* registration. The function does not trigger a remote processor boot,
|
|
* only sets the firmware name used for a subsequent boot. This function
|
|
* should also be called only when the remote processor is offline.
|
|
*
|
|
* This allows either the userspace to configure a different name through
|
|
* sysfs or a kernel-level remoteproc or a remoteproc client driver to set
|
|
* a specific firmware when it is controlling the boot and shutdown of the
|
|
* remote processor.
|
|
*
|
|
* Return: 0 on success or a negative value upon failure
|
|
*/
|
|
int rproc_set_firmware(struct rproc *rproc, const char *fw_name)
|
|
{
|
|
struct device *dev;
|
|
int ret, len;
|
|
char *p;
|
|
|
|
if (!rproc || !fw_name)
|
|
return -EINVAL;
|
|
|
|
dev = rproc->dev.parent;
|
|
|
|
ret = mutex_lock_interruptible(&rproc->lock);
|
|
if (ret) {
|
|
dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (rproc->state != RPROC_OFFLINE) {
|
|
dev_err(dev, "can't change firmware while running\n");
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
len = strcspn(fw_name, "\n");
|
|
if (!len) {
|
|
dev_err(dev, "can't provide empty string for firmware name\n");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
p = kstrndup(fw_name, len, GFP_KERNEL);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
kfree_const(rproc->firmware);
|
|
rproc->firmware = p;
|
|
|
|
out:
|
|
mutex_unlock(&rproc->lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(rproc_set_firmware);
|
|
|
|
static int rproc_validate(struct rproc *rproc)
|
|
{
|
|
switch (rproc->state) {
|
|
case RPROC_OFFLINE:
|
|
/*
|
|
* An offline processor without a start()
|
|
* function makes no sense.
|
|
*/
|
|
if (!rproc->ops->start)
|
|
return -EINVAL;
|
|
break;
|
|
case RPROC_DETACHED:
|
|
/*
|
|
* A remote processor in a detached state without an
|
|
* attach() function makes not sense.
|
|
*/
|
|
if (!rproc->ops->attach)
|
|
return -EINVAL;
|
|
/*
|
|
* When attaching to a remote processor the device memory
|
|
* is already available and as such there is no need to have a
|
|
* cached table.
|
|
*/
|
|
if (rproc->cached_table)
|
|
return -EINVAL;
|
|
break;
|
|
default:
|
|
/*
|
|
* When adding a remote processor, the state of the device
|
|
* can be offline or detached, nothing else.
|
|
*/
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
ret = rproc_validate(rproc);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
dev_info(dev, "%s is available\n", rproc->name);
|
|
|
|
/* create debugfs entries */
|
|
rproc_create_debug_dir(rproc);
|
|
|
|
/* add char device for this remoteproc */
|
|
ret = rproc_char_device_add(rproc);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* if rproc is marked always-on, request it to boot */
|
|
if (rproc->auto_boot) {
|
|
ret = rproc_trigger_auto_boot(rproc);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
/* expose to rproc_get_by_phandle users */
|
|
mutex_lock(&rproc_list_mutex);
|
|
list_add_rcu(&rproc->node, &rproc_list);
|
|
mutex_unlock(&rproc_list_mutex);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(rproc_add);
|
|
|
|
static void devm_rproc_remove(void *rproc)
|
|
{
|
|
rproc_del(rproc);
|
|
}
|
|
|
|
/**
|
|
* devm_rproc_add() - resource managed rproc_add()
|
|
* @dev: the underlying device
|
|
* @rproc: the remote processor handle to register
|
|
*
|
|
* This function performs like rproc_add() but the registered rproc device will
|
|
* automatically be removed on driver detach.
|
|
*
|
|
* Returns: 0 on success, negative errno on failure
|
|
*/
|
|
int devm_rproc_add(struct device *dev, struct rproc *rproc)
|
|
{
|
|
int err;
|
|
|
|
err = rproc_add(rproc);
|
|
if (err)
|
|
return err;
|
|
|
|
return devm_add_action_or_reset(dev, devm_rproc_remove, rproc);
|
|
}
|
|
EXPORT_SYMBOL(devm_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);
|
|
|
|
idr_destroy(&rproc->notifyids);
|
|
|
|
if (rproc->index >= 0)
|
|
ida_simple_remove(&rproc_dev_index, rproc->index);
|
|
|
|
kfree_const(rproc->firmware);
|
|
kfree_const(rproc->name);
|
|
kfree(rproc->ops);
|
|
kfree(rproc);
|
|
}
|
|
|
|
static const struct device_type rproc_type = {
|
|
.name = "remoteproc",
|
|
.release = rproc_type_release,
|
|
};
|
|
|
|
static int rproc_alloc_firmware(struct rproc *rproc,
|
|
const char *name, const char *firmware)
|
|
{
|
|
const char *p;
|
|
|
|
/*
|
|
* Allocate a firmware name if the caller gave us one to work
|
|
* with. Otherwise construct a new one using a default pattern.
|
|
*/
|
|
if (firmware)
|
|
p = kstrdup_const(firmware, GFP_KERNEL);
|
|
else
|
|
p = kasprintf(GFP_KERNEL, "rproc-%s-fw", name);
|
|
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
rproc->firmware = p;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rproc_alloc_ops(struct rproc *rproc, const struct rproc_ops *ops)
|
|
{
|
|
rproc->ops = kmemdup(ops, sizeof(*ops), GFP_KERNEL);
|
|
if (!rproc->ops)
|
|
return -ENOMEM;
|
|
|
|
/* Default to rproc_coredump if no coredump function is specified */
|
|
if (!rproc->ops->coredump)
|
|
rproc->ops->coredump = rproc_coredump;
|
|
|
|
if (rproc->ops->load)
|
|
return 0;
|
|
|
|
/* Default to ELF loader if no load function is specified */
|
|
rproc->ops->load = rproc_elf_load_segments;
|
|
rproc->ops->parse_fw = rproc_elf_load_rsc_table;
|
|
rproc->ops->find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table;
|
|
rproc->ops->sanity_check = rproc_elf_sanity_check;
|
|
rproc->ops->get_boot_addr = rproc_elf_get_boot_addr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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_free().
|
|
*/
|
|
struct rproc *rproc_alloc(struct device *dev, const char *name,
|
|
const struct rproc_ops *ops,
|
|
const char *firmware, int len)
|
|
{
|
|
struct rproc *rproc;
|
|
|
|
if (!dev || !name || !ops)
|
|
return NULL;
|
|
|
|
rproc = kzalloc(sizeof(struct rproc) + len, GFP_KERNEL);
|
|
if (!rproc)
|
|
return NULL;
|
|
|
|
rproc->priv = &rproc[1];
|
|
rproc->auto_boot = true;
|
|
rproc->elf_class = ELFCLASSNONE;
|
|
rproc->elf_machine = EM_NONE;
|
|
|
|
device_initialize(&rproc->dev);
|
|
rproc->dev.parent = dev;
|
|
rproc->dev.type = &rproc_type;
|
|
rproc->dev.class = &rproc_class;
|
|
rproc->dev.driver_data = rproc;
|
|
idr_init(&rproc->notifyids);
|
|
|
|
rproc->name = kstrdup_const(name, GFP_KERNEL);
|
|
if (!rproc->name)
|
|
goto put_device;
|
|
|
|
if (rproc_alloc_firmware(rproc, name, firmware))
|
|
goto put_device;
|
|
|
|
if (rproc_alloc_ops(rproc, ops))
|
|
goto put_device;
|
|
|
|
/* 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);
|
|
goto put_device;
|
|
}
|
|
|
|
dev_set_name(&rproc->dev, "remoteproc%d", rproc->index);
|
|
|
|
atomic_set(&rproc->power, 0);
|
|
|
|
mutex_init(&rproc->lock);
|
|
|
|
INIT_LIST_HEAD(&rproc->carveouts);
|
|
INIT_LIST_HEAD(&rproc->mappings);
|
|
INIT_LIST_HEAD(&rproc->traces);
|
|
INIT_LIST_HEAD(&rproc->rvdevs);
|
|
INIT_LIST_HEAD(&rproc->subdevs);
|
|
INIT_LIST_HEAD(&rproc->dump_segments);
|
|
|
|
INIT_WORK(&rproc->crash_handler, rproc_crash_handler_work);
|
|
|
|
rproc->state = RPROC_OFFLINE;
|
|
|
|
return rproc;
|
|
|
|
put_device:
|
|
put_device(&rproc->dev);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(rproc_alloc);
|
|
|
|
/**
|
|
* rproc_free() - 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_free(struct rproc *rproc)
|
|
{
|
|
put_device(&rproc->dev);
|
|
}
|
|
EXPORT_SYMBOL(rproc_free);
|
|
|
|
/**
|
|
* rproc_put() - release rproc reference
|
|
* @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)
|
|
{
|
|
module_put(rproc->dev.parent->driver->owner);
|
|
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_free().
|
|
*
|
|
* Returns 0 on success and -EINVAL if @rproc isn't valid.
|
|
*/
|
|
int rproc_del(struct rproc *rproc)
|
|
{
|
|
if (!rproc)
|
|
return -EINVAL;
|
|
|
|
/* TODO: make sure this works with rproc->power > 1 */
|
|
rproc_shutdown(rproc);
|
|
|
|
mutex_lock(&rproc->lock);
|
|
rproc->state = RPROC_DELETED;
|
|
mutex_unlock(&rproc->lock);
|
|
|
|
rproc_delete_debug_dir(rproc);
|
|
rproc_char_device_remove(rproc);
|
|
|
|
/* the rproc is downref'ed as soon as it's removed from the klist */
|
|
mutex_lock(&rproc_list_mutex);
|
|
list_del_rcu(&rproc->node);
|
|
mutex_unlock(&rproc_list_mutex);
|
|
|
|
/* Ensure that no readers of rproc_list are still active */
|
|
synchronize_rcu();
|
|
|
|
device_del(&rproc->dev);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(rproc_del);
|
|
|
|
static void devm_rproc_free(struct device *dev, void *res)
|
|
{
|
|
rproc_free(*(struct rproc **)res);
|
|
}
|
|
|
|
/**
|
|
* devm_rproc_alloc() - resource managed rproc_alloc()
|
|
* @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)
|
|
*
|
|
* This function performs like rproc_alloc() but the acquired rproc device will
|
|
* automatically be released on driver detach.
|
|
*
|
|
* Returns: new rproc instance, or NULL on failure
|
|
*/
|
|
struct rproc *devm_rproc_alloc(struct device *dev, const char *name,
|
|
const struct rproc_ops *ops,
|
|
const char *firmware, int len)
|
|
{
|
|
struct rproc **ptr, *rproc;
|
|
|
|
ptr = devres_alloc(devm_rproc_free, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr)
|
|
return NULL;
|
|
|
|
rproc = rproc_alloc(dev, name, ops, firmware, len);
|
|
if (rproc) {
|
|
*ptr = rproc;
|
|
devres_add(dev, ptr);
|
|
} else {
|
|
devres_free(ptr);
|
|
}
|
|
|
|
return rproc;
|
|
}
|
|
EXPORT_SYMBOL(devm_rproc_alloc);
|
|
|
|
/**
|
|
* rproc_add_subdev() - add a subdevice to a remoteproc
|
|
* @rproc: rproc handle to add the subdevice to
|
|
* @subdev: subdev handle to register
|
|
*
|
|
* Caller is responsible for populating optional subdevice function pointers.
|
|
*/
|
|
void rproc_add_subdev(struct rproc *rproc, struct rproc_subdev *subdev)
|
|
{
|
|
list_add_tail(&subdev->node, &rproc->subdevs);
|
|
}
|
|
EXPORT_SYMBOL(rproc_add_subdev);
|
|
|
|
/**
|
|
* rproc_remove_subdev() - remove a subdevice from a remoteproc
|
|
* @rproc: rproc handle to remove the subdevice from
|
|
* @subdev: subdev handle, previously registered with rproc_add_subdev()
|
|
*/
|
|
void rproc_remove_subdev(struct rproc *rproc, struct rproc_subdev *subdev)
|
|
{
|
|
list_del(&subdev->node);
|
|
}
|
|
EXPORT_SYMBOL(rproc_remove_subdev);
|
|
|
|
/**
|
|
* rproc_get_by_child() - acquire rproc handle of @dev's ancestor
|
|
* @dev: child device to find ancestor of
|
|
*
|
|
* Returns the ancestor rproc instance, or NULL if not found.
|
|
*/
|
|
struct rproc *rproc_get_by_child(struct device *dev)
|
|
{
|
|
for (dev = dev->parent; dev; dev = dev->parent) {
|
|
if (dev->type == &rproc_type)
|
|
return dev->driver_data;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(rproc_get_by_child);
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
/* Prevent suspend while the remoteproc is being recovered */
|
|
pm_stay_awake(rproc->dev.parent);
|
|
|
|
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 rproc_panic_handler(struct notifier_block *nb, unsigned long event,
|
|
void *ptr)
|
|
{
|
|
unsigned int longest = 0;
|
|
struct rproc *rproc;
|
|
unsigned int d;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(rproc, &rproc_list, node) {
|
|
if (!rproc->ops->panic)
|
|
continue;
|
|
|
|
if (rproc->state != RPROC_RUNNING &&
|
|
rproc->state != RPROC_ATTACHED)
|
|
continue;
|
|
|
|
d = rproc->ops->panic(rproc);
|
|
longest = max(longest, d);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
/*
|
|
* Delay for the longest requested duration before returning. This can
|
|
* be used by the remoteproc drivers to give the remote processor time
|
|
* to perform any requested operations (such as flush caches), when
|
|
* it's not possible to signal the Linux side due to the panic.
|
|
*/
|
|
mdelay(longest);
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static void __init rproc_init_panic(void)
|
|
{
|
|
rproc_panic_nb.notifier_call = rproc_panic_handler;
|
|
atomic_notifier_chain_register(&panic_notifier_list, &rproc_panic_nb);
|
|
}
|
|
|
|
static void __exit rproc_exit_panic(void)
|
|
{
|
|
atomic_notifier_chain_unregister(&panic_notifier_list, &rproc_panic_nb);
|
|
}
|
|
|
|
static int __init remoteproc_init(void)
|
|
{
|
|
rproc_init_sysfs();
|
|
rproc_init_debugfs();
|
|
rproc_init_cdev();
|
|
rproc_init_panic();
|
|
|
|
return 0;
|
|
}
|
|
subsys_initcall(remoteproc_init);
|
|
|
|
static void __exit remoteproc_exit(void)
|
|
{
|
|
ida_destroy(&rproc_dev_index);
|
|
|
|
rproc_exit_panic();
|
|
rproc_exit_debugfs();
|
|
rproc_exit_sysfs();
|
|
}
|
|
module_exit(remoteproc_exit);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("Generic Remote Processor Framework");
|