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remoteproc: Move Elf related functions to separate file
Prepare for introduction of custom firmware loaders by moving all ELF related handling into a separate file. The functions: rproc_find_rsc_table(), rproc_fw_sanity_check(), rproc_find_rsc_table() and rproc_get_boot_addr() are moved to the new file remoteproc_elf_loader.c. The function rproc_da_to_va() is made non-static and is declared in remoteproc_internal.h No functional changes are introduced in this patch. Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com> [ohad: rebase, fix kerneldoc, put prototypes in remoteproc_internal.h] Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
This commit is contained in:
Sjur Brændeland
Ohad Ben-Cohen
parent
3e5f9eb5d9
commit
72854fb042
@ -6,4 +6,5 @@ obj-$(CONFIG_REMOTEPROC) += remoteproc.o
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remoteproc-y := remoteproc_core.o
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remoteproc-y += remoteproc_debugfs.o
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remoteproc-y += remoteproc_virtio.o
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remoteproc-y += remoteproc_elf_loader.o
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obj-$(CONFIG_OMAP_REMOTEPROC) += omap_remoteproc.o
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@ -149,7 +149,7 @@ static void rproc_disable_iommu(struct rproc *rproc)
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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, which should be more correct.
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*/
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static void *rproc_da_to_va(struct rproc *rproc, u64 da, int len)
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void *rproc_da_to_va(struct rproc *rproc, u64 da, int len)
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{
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struct rproc_mem_entry *carveout;
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void *ptr = NULL;
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@ -173,96 +173,6 @@ static void *rproc_da_to_va(struct rproc *rproc, u64 da, int len)
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return ptr;
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}
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/**
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* rproc_load_segments() - load firmware segments to memory
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* @rproc: remote processor which will be booted using these fw segments
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* @fw: the ELF firmware image
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*
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* This function loads the firmware segments to memory, where the remote
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* processor expects them.
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*
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* Some remote processors will expect their code and data to be placed
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* in specific device addresses, and can't have them dynamically assigned.
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*
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* We currently support only those kind of remote processors, and expect
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* the program header's paddr member to contain those addresses. We then go
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* through the physically contiguous "carveout" memory regions which we
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* allocated (and mapped) earlier on behalf of the remote processor,
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* and "translate" device address to kernel addresses, so we can copy the
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* segments where they are expected.
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*
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* Currently we only support remote processors that required carveout
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* allocations and got them mapped onto their iommus. Some processors
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* might be different: they might not have iommus, and would prefer to
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* directly allocate memory for every segment/resource. This is not yet
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* supported, though.
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*/
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static int
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rproc_load_segments(struct rproc *rproc, const struct firmware *fw)
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{
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struct device *dev = &rproc->dev;
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struct elf32_hdr *ehdr;
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struct elf32_phdr *phdr;
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int i, ret = 0;
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const u8 *elf_data = fw->data;
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ehdr = (struct elf32_hdr *)elf_data;
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phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff);
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/* go through the available ELF segments */
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for (i = 0; i < ehdr->e_phnum; i++, phdr++) {
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u32 da = phdr->p_paddr;
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u32 memsz = phdr->p_memsz;
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u32 filesz = phdr->p_filesz;
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u32 offset = phdr->p_offset;
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void *ptr;
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if (phdr->p_type != PT_LOAD)
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continue;
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dev_dbg(dev, "phdr: type %d da 0x%x memsz 0x%x filesz 0x%x\n",
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phdr->p_type, da, memsz, filesz);
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if (filesz > memsz) {
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dev_err(dev, "bad phdr filesz 0x%x memsz 0x%x\n",
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filesz, memsz);
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ret = -EINVAL;
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break;
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}
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if (offset + filesz > fw->size) {
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dev_err(dev, "truncated fw: need 0x%x avail 0x%x\n",
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offset + filesz, fw->size);
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ret = -EINVAL;
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break;
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}
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/* grab the kernel address for this device address */
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ptr = rproc_da_to_va(rproc, da, memsz);
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if (!ptr) {
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dev_err(dev, "bad phdr da 0x%x mem 0x%x\n", da, memsz);
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ret = -EINVAL;
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break;
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}
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/* put the segment where the remote processor expects it */
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if (phdr->p_filesz)
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memcpy(ptr, elf_data + phdr->p_offset, filesz);
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/*
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* Zero out remaining memory for this segment.
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*
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* This isn't strictly required since dma_alloc_coherent already
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* did this for us. albeit harmless, we may consider removing
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* this.
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*/
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if (memsz > filesz)
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memset(ptr + filesz, 0, memsz - filesz);
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}
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return ret;
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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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@ -816,85 +726,6 @@ rproc_handle_virtio_rsc(struct rproc *rproc, struct resource_table *table, int l
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return ret;
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}
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/**
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* rproc_find_rsc_table() - find the resource table
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* @rproc: the rproc handle
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* @fw: the ELF firmware image
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* @tablesz: place holder for providing back the table size
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*
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* This function finds the resource table inside the remote processor's
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* firmware. It is used both upon the registration of @rproc (in order
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* to look for and register the supported virito devices), and when the
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* @rproc is booted.
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*
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* Returns the pointer to the resource table if it is found, and write its
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* size into @tablesz. If a valid table isn't found, NULL is returned
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* (and @tablesz isn't set).
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*/
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static struct resource_table *
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rproc_find_rsc_table(struct rproc *rproc, const struct firmware *fw,
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int *tablesz)
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{
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struct elf32_hdr *ehdr;
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struct elf32_shdr *shdr;
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const char *name_table;
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struct device *dev = &rproc->dev;
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struct resource_table *table = NULL;
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int i;
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const u8 *elf_data = fw->data;
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ehdr = (struct elf32_hdr *)elf_data;
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shdr = (struct elf32_shdr *)(elf_data + ehdr->e_shoff);
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name_table = elf_data + shdr[ehdr->e_shstrndx].sh_offset;
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/* look for the resource table and handle it */
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for (i = 0; i < ehdr->e_shnum; i++, shdr++) {
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int size = shdr->sh_size;
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int offset = shdr->sh_offset;
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if (strcmp(name_table + shdr->sh_name, ".resource_table"))
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continue;
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table = (struct resource_table *)(elf_data + offset);
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/* make sure we have the entire table */
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if (offset + size > fw->size) {
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dev_err(dev, "resource table truncated\n");
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return NULL;
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}
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/* make sure table has at least the header */
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if (sizeof(struct resource_table) > size) {
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dev_err(dev, "header-less resource table\n");
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return NULL;
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}
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/* we don't support any version beyond the first */
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if (table->ver != 1) {
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dev_err(dev, "unsupported fw ver: %d\n", table->ver);
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return NULL;
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}
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/* make sure reserved bytes are zeroes */
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if (table->reserved[0] || table->reserved[1]) {
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dev_err(dev, "non zero reserved bytes\n");
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return NULL;
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}
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/* make sure the offsets array isn't truncated */
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if (table->num * sizeof(table->offset[0]) +
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sizeof(struct resource_table) > size) {
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dev_err(dev, "resource table incomplete\n");
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return NULL;
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}
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*tablesz = shdr->sh_size;
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break;
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}
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return table;
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}
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/**
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* rproc_resource_cleanup() - clean up and free all acquired resources
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* @rproc: rproc handle
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@ -938,84 +769,6 @@ static void rproc_resource_cleanup(struct rproc *rproc)
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}
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}
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/* make sure this fw image is sane */
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static int rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw)
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{
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const char *name = rproc->firmware;
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struct device *dev = &rproc->dev;
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struct elf32_hdr *ehdr;
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char class;
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if (!fw) {
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dev_err(dev, "failed to load %s\n", name);
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return -EINVAL;
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}
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if (fw->size < sizeof(struct elf32_hdr)) {
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dev_err(dev, "Image is too small\n");
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return -EINVAL;
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}
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ehdr = (struct elf32_hdr *)fw->data;
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/* We only support ELF32 at this point */
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class = ehdr->e_ident[EI_CLASS];
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if (class != ELFCLASS32) {
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dev_err(dev, "Unsupported class: %d\n", class);
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return -EINVAL;
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}
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/* We assume the firmware has the same endianess as the host */
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# ifdef __LITTLE_ENDIAN
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if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB) {
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# else /* BIG ENDIAN */
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if (ehdr->e_ident[EI_DATA] != ELFDATA2MSB) {
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# endif
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dev_err(dev, "Unsupported firmware endianess\n");
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return -EINVAL;
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}
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if (fw->size < ehdr->e_shoff + sizeof(struct elf32_shdr)) {
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dev_err(dev, "Image is too small\n");
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return -EINVAL;
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}
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if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) {
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dev_err(dev, "Image is corrupted (bad magic)\n");
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return -EINVAL;
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}
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if (ehdr->e_phnum == 0) {
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dev_err(dev, "No loadable segments\n");
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return -EINVAL;
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}
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if (ehdr->e_phoff > fw->size) {
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dev_err(dev, "Firmware size is too small\n");
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return -EINVAL;
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}
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return 0;
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}
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/**
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* rproc_get_boot_addr() - Get rproc's boot address.
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* @rproc: the remote processor handle
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* @fw: the ELF firmware image
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*
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* This function returns the entry point address of the ELF
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* image.
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*
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* Note that the boot address is not a configurable property of all remote
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* processors. Some will always boot at a specific hard-coded address.
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*/
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u32 rproc_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
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{
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struct elf32_hdr *ehdr = (struct elf32_hdr *)fw->data;
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return ehdr->e_entry;
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}
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/*
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* take a firmware and boot a remote processor with it.
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*/
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287
drivers/remoteproc/remoteproc_elf_loader.c
Normal file
287
drivers/remoteproc/remoteproc_elf_loader.c
Normal file
@ -0,0 +1,287 @@
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/*
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* Remote Processor Framework Elf loader
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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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* Sjur Brændeland <sjur.brandeland@stericsson.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define pr_fmt(fmt) "%s: " fmt, __func__
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#include <linux/module.h>
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#include <linux/firmware.h>
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#include <linux/remoteproc.h>
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#include <linux/elf.h>
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#include "remoteproc_internal.h"
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/**
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* rproc_fw_sanity_check() - Sanity Check ELF firmware image
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* @rproc: the remote processor handle
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* @fw: the ELF firmware image
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*
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* Make sure this fw image is sane.
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*/
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int
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rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw)
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{
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const char *name = rproc->firmware;
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struct device *dev = &rproc->dev;
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struct elf32_hdr *ehdr;
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char class;
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if (!fw) {
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dev_err(dev, "failed to load %s\n", name);
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return -EINVAL;
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}
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if (fw->size < sizeof(struct elf32_hdr)) {
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dev_err(dev, "Image is too small\n");
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return -EINVAL;
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}
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ehdr = (struct elf32_hdr *)fw->data;
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/* We only support ELF32 at this point */
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class = ehdr->e_ident[EI_CLASS];
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if (class != ELFCLASS32) {
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dev_err(dev, "Unsupported class: %d\n", class);
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return -EINVAL;
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}
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/* We assume the firmware has the same endianess as the host */
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# ifdef __LITTLE_ENDIAN
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if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB) {
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# else /* BIG ENDIAN */
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if (ehdr->e_ident[EI_DATA] != ELFDATA2MSB) {
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# endif
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dev_err(dev, "Unsupported firmware endianess\n");
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return -EINVAL;
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}
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if (fw->size < ehdr->e_shoff + sizeof(struct elf32_shdr)) {
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dev_err(dev, "Image is too small\n");
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return -EINVAL;
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}
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if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) {
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dev_err(dev, "Image is corrupted (bad magic)\n");
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return -EINVAL;
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}
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if (ehdr->e_phnum == 0) {
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dev_err(dev, "No loadable segments\n");
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return -EINVAL;
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}
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if (ehdr->e_phoff > fw->size) {
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dev_err(dev, "Firmware size is too small\n");
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return -EINVAL;
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}
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return 0;
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}
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/**
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* rproc_get_boot_addr() - Get rproc's boot address.
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* @rproc: the remote processor handle
|
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* @fw: the ELF firmware image
|
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*
|
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* This function returns the entry point address of the ELF
|
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* image.
|
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*
|
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* Note that the boot address is not a configurable property of all remote
|
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* processors. Some will always boot at a specific hard-coded address.
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*/
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u32 rproc_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
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{
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struct elf32_hdr *ehdr = (struct elf32_hdr *)fw->data;
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return ehdr->e_entry;
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}
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/**
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* rproc_load_segments() - load firmware segments to memory
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* @rproc: remote processor which will be booted using these fw segments
|
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* @fw: the ELF firmware image
|
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*
|
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* This function loads the firmware segments to memory, where the remote
|
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* processor expects them.
|
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*
|
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* Some remote processors will expect their code and data to be placed
|
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* in specific device addresses, and can't have them dynamically assigned.
|
||||
*
|
||||
* We currently support only those kind of remote processors, and expect
|
||||
* the program header's paddr member to contain those addresses. We then go
|
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* through the physically contiguous "carveout" memory regions which we
|
||||
* allocated (and mapped) earlier on behalf of the remote processor,
|
||||
* and "translate" device address to kernel addresses, so we can copy the
|
||||
* segments where they are expected.
|
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*
|
||||
* Currently we only support remote processors that required carveout
|
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* allocations and got them mapped onto their iommus. Some processors
|
||||
* might be different: they might not have iommus, and would prefer to
|
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* directly allocate memory for every segment/resource. This is not yet
|
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* supported, though.
|
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*/
|
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int
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rproc_load_segments(struct rproc *rproc, const struct firmware *fw)
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{
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struct device *dev = &rproc->dev;
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struct elf32_hdr *ehdr;
|
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struct elf32_phdr *phdr;
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int i, ret = 0;
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const u8 *elf_data = fw->data;
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ehdr = (struct elf32_hdr *)elf_data;
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phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff);
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/* go through the available ELF segments */
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for (i = 0; i < ehdr->e_phnum; i++, phdr++) {
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u32 da = phdr->p_paddr;
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u32 memsz = phdr->p_memsz;
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u32 filesz = phdr->p_filesz;
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u32 offset = phdr->p_offset;
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void *ptr;
|
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|
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if (phdr->p_type != PT_LOAD)
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continue;
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||||
dev_dbg(dev, "phdr: type %d da 0x%x memsz 0x%x filesz 0x%x\n",
|
||||
phdr->p_type, da, memsz, filesz);
|
||||
|
||||
if (filesz > memsz) {
|
||||
dev_err(dev, "bad phdr filesz 0x%x memsz 0x%x\n",
|
||||
filesz, memsz);
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
if (offset + filesz > fw->size) {
|
||||
dev_err(dev, "truncated fw: need 0x%x avail 0x%x\n",
|
||||
offset + filesz, fw->size);
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
/* grab the kernel address for this device address */
|
||||
ptr = rproc_da_to_va(rproc, da, memsz);
|
||||
if (!ptr) {
|
||||
dev_err(dev, "bad phdr da 0x%x mem 0x%x\n", da, memsz);
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
/* put the segment where the remote processor expects it */
|
||||
if (phdr->p_filesz)
|
||||
memcpy(ptr, elf_data + phdr->p_offset, filesz);
|
||||
|
||||
/*
|
||||
* Zero out remaining memory for this segment.
|
||||
*
|
||||
* This isn't strictly required since dma_alloc_coherent already
|
||||
* did this for us. albeit harmless, we may consider removing
|
||||
* this.
|
||||
*/
|
||||
if (memsz > filesz)
|
||||
memset(ptr + filesz, 0, memsz - filesz);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* rproc_find_rsc_table() - find the resource table
|
||||
* @rproc: the rproc handle
|
||||
* @fw: the ELF firmware image
|
||||
* @tablesz: place holder for providing back the table size
|
||||
*
|
||||
* This function finds the resource table inside the remote processor's
|
||||
* firmware. It is used both upon the registration of @rproc (in order
|
||||
* to look for and register the supported virito devices), and when the
|
||||
* @rproc is booted.
|
||||
*
|
||||
* Returns the pointer to the resource table if it is found, and write its
|
||||
* size into @tablesz. If a valid table isn't found, NULL is returned
|
||||
* (and @tablesz isn't set).
|
||||
*/
|
||||
struct resource_table *
|
||||
rproc_find_rsc_table(struct rproc *rproc, const struct firmware *fw,
|
||||
int *tablesz)
|
||||
{
|
||||
struct elf32_hdr *ehdr;
|
||||
struct elf32_shdr *shdr;
|
||||
const char *name_table;
|
||||
struct device *dev = &rproc->dev;
|
||||
struct resource_table *table = NULL;
|
||||
int i;
|
||||
const u8 *elf_data = fw->data;
|
||||
|
||||
ehdr = (struct elf32_hdr *)elf_data;
|
||||
shdr = (struct elf32_shdr *)(elf_data + ehdr->e_shoff);
|
||||
name_table = elf_data + shdr[ehdr->e_shstrndx].sh_offset;
|
||||
|
||||
/* look for the resource table and handle it */
|
||||
for (i = 0; i < ehdr->e_shnum; i++, shdr++) {
|
||||
int size = shdr->sh_size;
|
||||
int offset = shdr->sh_offset;
|
||||
|
||||
if (strcmp(name_table + shdr->sh_name, ".resource_table"))
|
||||
continue;
|
||||
|
||||
table = (struct resource_table *)(elf_data + offset);
|
||||
|
||||
/* make sure we have the entire table */
|
||||
if (offset + size > fw->size) {
|
||||
dev_err(dev, "resource table truncated\n");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* make sure table has at least the header */
|
||||
if (sizeof(struct resource_table) > size) {
|
||||
dev_err(dev, "header-less resource table\n");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* we don't support any version beyond the first */
|
||||
if (table->ver != 1) {
|
||||
dev_err(dev, "unsupported fw ver: %d\n", table->ver);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* make sure reserved bytes are zeroes */
|
||||
if (table->reserved[0] || table->reserved[1]) {
|
||||
dev_err(dev, "non zero reserved bytes\n");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* make sure the offsets array isn't truncated */
|
||||
if (table->num * sizeof(table->offset[0]) +
|
||||
sizeof(struct resource_table) > size) {
|
||||
dev_err(dev, "resource table incomplete\n");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
*tablesz = shdr->sh_size;
|
||||
break;
|
||||
}
|
||||
|
||||
return table;
|
||||
}
|
||||
@ -21,6 +21,7 @@
|
||||
#define REMOTEPROC_INTERNAL_H
|
||||
|
||||
#include <linux/irqreturn.h>
|
||||
#include <linux/firmware.h>
|
||||
|
||||
struct rproc;
|
||||
|
||||
@ -43,4 +44,14 @@ void rproc_exit_debugfs(void);
|
||||
|
||||
void rproc_free_vring(struct rproc_vring *rvring);
|
||||
int rproc_alloc_vring(struct rproc_vdev *rvdev, int i);
|
||||
|
||||
void *rproc_da_to_va(struct rproc *rproc, u64 da, int len);
|
||||
|
||||
struct resource_table *rproc_find_rsc_table(struct rproc *rproc,
|
||||
const struct firmware *fw,
|
||||
int *tablesz);
|
||||
int rproc_load_segments(struct rproc *rproc, const struct firmware *fw);
|
||||
int rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw);
|
||||
u32 rproc_get_boot_addr(struct rproc *rproc, const struct firmware *fw);
|
||||
|
||||
#endif /* REMOTEPROC_INTERNAL_H */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user