diff options
| -rw-r--r-- | drivers/remoteproc/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/remoteproc/remoteproc_core.c | 128 | ||||
| -rw-r--r-- | include/linux/remoteproc.h | 18 |
3 files changed, 147 insertions, 0 deletions
diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig index b609e1d3654b..3e4bca77188d 100644 --- a/drivers/remoteproc/Kconfig +++ b/drivers/remoteproc/Kconfig @@ -6,6 +6,7 @@ config REMOTEPROC select CRC32 select FW_LOADER select VIRTIO + select WANT_DEV_COREDUMP help Support for remote processors (such as DSP coprocessors). These are mainly used on embedded systems. diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index 4170dfbd93bd..5af7547b9d8d 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -33,6 +33,7 @@ #include <linux/firmware.h> #include <linux/string.h> #include <linux/debugfs.h> +#include <linux/devcoredump.h> #include <linux/remoteproc.h> #include <linux/iommu.h> #include <linux/idr.h> @@ -802,6 +803,20 @@ static void rproc_remove_subdevices(struct rproc *rproc) } /** + * rproc_coredump_cleanup() - clean up dump_segments list + * @rproc: the remote processor handle + */ +static void rproc_coredump_cleanup(struct rproc *rproc) +{ + struct rproc_dump_segment *entry, *tmp; + + list_for_each_entry_safe(entry, tmp, &rproc->dump_segments, node) { + list_del(&entry->node); + kfree(entry); + } +} + +/** * rproc_resource_cleanup() - clean up and free all acquired resources * @rproc: rproc handle * @@ -848,6 +863,8 @@ static void rproc_resource_cleanup(struct rproc *rproc) /* 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); } static int rproc_start(struct rproc *rproc, const struct firmware *fw) @@ -1018,6 +1035,113 @@ static int rproc_stop(struct rproc *rproc) } /** + * rproc_coredump_add_segment() - add segment of device memory to coredump + * @rproc: handle of a remote processor + * @da: device address + * @size: size of segment + * + * Add device memory to the list of segments to be included in a coredump for + * the remoteproc. + * + * Return: 0 on success, negative errno on error. + */ +int rproc_coredump_add_segment(struct rproc *rproc, dma_addr_t da, size_t size) +{ + struct rproc_dump_segment *segment; + + segment = kzalloc(sizeof(*segment), GFP_KERNEL); + if (!segment) + return -ENOMEM; + + segment->da = da; + segment->size = size; + + list_add_tail(&segment->node, &rproc->dump_segments); + + return 0; +} +EXPORT_SYMBOL(rproc_coredump_add_segment); + +/** + * rproc_coredump() - perform coredump + * @rproc: rproc handle + * + * This function will generate an ELF header for the registered segments + * and create a devcoredump device associated with rproc. + */ +static void rproc_coredump(struct rproc *rproc) +{ + struct rproc_dump_segment *segment; + struct elf32_phdr *phdr; + struct elf32_hdr *ehdr; + size_t data_size; + size_t offset; + void *data; + void *ptr; + int phnum = 0; + + if (list_empty(&rproc->dump_segments)) + return; + + data_size = sizeof(*ehdr); + list_for_each_entry(segment, &rproc->dump_segments, node) { + data_size += sizeof(*phdr) + segment->size; + + phnum++; + } + + data = vmalloc(data_size); + if (!data) + return; + + ehdr = data; + + memset(ehdr, 0, sizeof(*ehdr)); + memcpy(ehdr->e_ident, ELFMAG, SELFMAG); + ehdr->e_ident[EI_CLASS] = ELFCLASS32; + ehdr->e_ident[EI_DATA] = ELFDATA2LSB; + ehdr->e_ident[EI_VERSION] = EV_CURRENT; + ehdr->e_ident[EI_OSABI] = ELFOSABI_NONE; + ehdr->e_type = ET_CORE; + ehdr->e_machine = EM_NONE; + ehdr->e_version = EV_CURRENT; + ehdr->e_entry = rproc->bootaddr; + ehdr->e_phoff = sizeof(*ehdr); + ehdr->e_ehsize = sizeof(*ehdr); + ehdr->e_phentsize = sizeof(*phdr); + ehdr->e_phnum = phnum; + + phdr = data + ehdr->e_phoff; + offset = ehdr->e_phoff + sizeof(*phdr) * ehdr->e_phnum; + list_for_each_entry(segment, &rproc->dump_segments, node) { + memset(phdr, 0, sizeof(*phdr)); + phdr->p_type = PT_LOAD; + phdr->p_offset = offset; + phdr->p_vaddr = segment->da; + phdr->p_paddr = segment->da; + phdr->p_filesz = segment->size; + phdr->p_memsz = segment->size; + phdr->p_flags = PF_R | PF_W | PF_X; + phdr->p_align = 0; + + ptr = rproc_da_to_va(rproc, segment->da, segment->size); + if (!ptr) { + dev_err(&rproc->dev, + "invalid coredump segment (%pad, %zu)\n", + &segment->da, segment->size); + memset(data + offset, 0xff, segment->size); + } else { + memcpy(data + offset, ptr, segment->size); + } + + offset += phdr->p_filesz; + phdr++; + } + + dev_coredumpv(&rproc->dev, data, data_size, GFP_KERNEL); +} + +/** * rproc_trigger_recovery() - recover a remoteproc * @rproc: the remote processor * @@ -1043,6 +1167,9 @@ int rproc_trigger_recovery(struct rproc *rproc) if (ret) goto unlock_mutex; + /* generate coredump */ + rproc_coredump(rproc); + /* load firmware */ ret = request_firmware(&firmware_p, rproc->firmware, dev); if (ret < 0) { @@ -1443,6 +1570,7 @@ struct rproc *rproc_alloc(struct device *dev, const char *name, 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); diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h index 728d421fffe9..b60c3a31b75d 100644 --- a/include/linux/remoteproc.h +++ b/include/linux/remoteproc.h @@ -395,6 +395,21 @@ enum rproc_crash_type { }; /** + * struct rproc_dump_segment - segment info from ELF header + * @node: list node related to the rproc segment list + * @da: device address of the segment + * @size: size of the segment + */ +struct rproc_dump_segment { + struct list_head node; + + dma_addr_t da; + size_t size; + + loff_t offset; +}; + +/** * struct rproc - represents a physical remote processor device * @node: list node of this rproc object * @domain: iommu domain @@ -424,6 +439,7 @@ enum rproc_crash_type { * @cached_table: copy of the resource table * @table_sz: size of @cached_table * @has_iommu: flag to indicate if remote processor is behind an MMU + * @dump_segments: list of segments in the firmware */ struct rproc { struct list_head node; @@ -455,6 +471,7 @@ struct rproc { size_t table_sz; bool has_iommu; bool auto_boot; + struct list_head dump_segments; }; /** @@ -534,6 +551,7 @@ void rproc_free(struct rproc *rproc); int rproc_boot(struct rproc *rproc); void rproc_shutdown(struct rproc *rproc); void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type); +int rproc_coredump_add_segment(struct rproc *rproc, dma_addr_t da, size_t size); static inline struct rproc_vdev *vdev_to_rvdev(struct virtio_device *vdev) { |