[PATCH 5/7] remoteproc: Move Elf related functions to separate file

From: sjur . brandeland
Date: Wed Jun 06 2012 - 09:40:03 EST


From: Sjur BrÃndeland <sjur.brandeland@xxxxxxxxxxxxxx>

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_set_boot_addr() are moved
to the new file remoteproc_elf_loader.c. No functional
changes are introduced in this patch.

Signed-off-by: Sjur BrÃndeland <sjur.brandeland@xxxxxxxxxxxxxx>
---
drivers/remoteproc/Makefile | 1 +
drivers/remoteproc/remoteproc_core.c | 247 +------------------------
drivers/remoteproc/remoteproc_elf_loader.c | 279 ++++++++++++++++++++++++++++
include/linux/remoteproc.h | 11 +
4 files changed, 292 insertions(+), 246 deletions(-)
create mode 100644 drivers/remoteproc/remoteproc_elf_loader.c

diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index 5445d9b..934ce6e 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -6,4 +6,5 @@ obj-$(CONFIG_REMOTEPROC) += remoteproc.o
remoteproc-y := remoteproc_core.o
remoteproc-y += remoteproc_debugfs.o
remoteproc-y += remoteproc_virtio.o
+remoteproc-y += remoteproc_elf_loader.o
obj-$(CONFIG_OMAP_REMOTEPROC) += omap_remoteproc.o
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 1dd7f53..db5359a 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -165,7 +165,7 @@ static void rproc_disable_iommu(struct rproc *rproc)
* but only on kernel direct mapped RAM memory. Instead, we're just using
* here the output of the DMA API, which should be more correct.
*/
-static void *rproc_da_to_va(struct rproc *rproc, u64 da, int len)
+void *rproc_da_to_va(struct rproc *rproc, u64 da, int len)
{
struct rproc_mem_entry *carveout;
void *ptr = NULL;
@@ -189,96 +189,6 @@ static void *rproc_da_to_va(struct rproc *rproc, u64 da, int len)
return ptr;
}

-/**
- * rproc_load_segments() - load firmware segments to memory
- * @rproc: remote processor which will be booted using these fw segments
- * @fw: the the ELF firmware image
- *
- * This function loads the firmware segments to memory, where the remote
- * processor expects them.
- *
- * Some remote processors will expect their code and data to be placed
- * 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
- * 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.
- *
- * Currently we only support remote processors that required carveout
- * allocations and got them mapped onto their iommus. Some processors
- * might be different: they might not have iommus, and would prefer to
- * directly allocate memory for every segment/resource. This is not yet
- * supported, though.
- */
-static int
-rproc_load_segments(struct rproc *rproc, const struct firmware *fw)
-{
- struct device *dev = rproc->dev;
- struct elf32_hdr *ehdr;
- struct elf32_phdr *phdr;
- int i, ret = 0;
- const u8 *elf_data = fw->data;
-
- ehdr = (struct elf32_hdr *)elf_data;
- phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff);
-
- /* go through the available ELF segments */
- for (i = 0; i < ehdr->e_phnum; i++, phdr++) {
- u32 da = phdr->p_paddr;
- u32 memsz = phdr->p_memsz;
- u32 filesz = phdr->p_filesz;
- u32 offset = phdr->p_offset;
- void *ptr;
-
- if (phdr->p_type != PT_LOAD)
- continue;
-
- 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%zx\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;
-}
-
static int
__rproc_handle_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i)
{
@@ -822,85 +732,6 @@ rproc_handle_virtio_rsc(struct rproc *rproc, struct resource_table *table, int l
}

/**
- * 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).
- */
-static 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;
-}
-
-/**
* rproc_resource_cleanup() - clean up and free all acquired resources
* @rproc: rproc handle
*
@@ -943,82 +774,6 @@ static void rproc_resource_cleanup(struct rproc *rproc)
}
}

-/* make sure this fw image is sane */
-static int rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw)
-{
- const char *name = rproc->firmware;
- struct device *dev = rproc->dev;
- struct elf32_hdr *ehdr;
- char class;
-
- if (!fw) {
- dev_err(dev, "failed to load %s\n", name);
- return -EINVAL;
- }
-
- if (fw->size < sizeof(struct elf32_hdr)) {
- dev_err(dev, "Image is too small\n");
- return -EINVAL;
- }
-
- ehdr = (struct elf32_hdr *)fw->data;
-
- /* We only support ELF32 at this point */
- class = ehdr->e_ident[EI_CLASS];
- if (class != ELFCLASS32) {
- dev_err(dev, "Unsupported class: %d\n", class);
- return -EINVAL;
- }
-
- /* We assume the firmware has the same endianess as the host */
-# ifdef __LITTLE_ENDIAN
- if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB) {
-# else /* BIG ENDIAN */
- if (ehdr->e_ident[EI_DATA] != ELFDATA2MSB) {
-# endif
- dev_err(dev, "Unsupported firmware endianess\n");
- return -EINVAL;
- }
-
- if (fw->size < ehdr->e_shoff + sizeof(struct elf32_shdr)) {
- dev_err(dev, "Image is too small\n");
- return -EINVAL;
- }
-
- if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) {
- dev_err(dev, "Image is corrupted (bad magic)\n");
- return -EINVAL;
- }
-
- if (ehdr->e_phnum == 0) {
- dev_err(dev, "No loadable segments\n");
- return -EINVAL;
- }
-
- if (ehdr->e_phoff > fw->size) {
- dev_err(dev, "Firmware size is too small\n");
- return -EINVAL;
- }
-
- return 0;
-}
-
-/**
- * rproc_set_boot_addr() - Set rproc's boot address.
- * @rproc: remote processor which needs boot address set.
- * @fw: the the ELF firmware image
- *
- * This function reads the ELF entry point address and assign this
- * to the rproc's boot address.
- * Note that the boot address is not a configurable property of all remote
- * processors. Some will always boot at a specific hard-coded address.
- */
-void rproc_set_boot_addr(struct rproc *rproc, const struct firmware *fw)
-{
- struct elf32_hdr *ehdr = (struct elf32_hdr *)fw->data;
- rproc->bootaddr = ehdr->e_entry;
-}
-
/*
* take a firmware and boot a remote processor with it.
*/
diff --git a/drivers/remoteproc/remoteproc_elf_loader.c b/drivers/remoteproc/remoteproc_elf_loader.c
new file mode 100644
index 0000000..2017ae3
--- /dev/null
+++ b/drivers/remoteproc/remoteproc_elf_loader.c
@@ -0,0 +1,279 @@
+/*
+ * Remote Processor Framework Elf loader
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * Ohad Ben-Cohen <ohad@xxxxxxxxxx>
+ * Brian Swetland <swetland@xxxxxxxxxx>
+ * Mark Grosen <mgrosen@xxxxxx>
+ * Fernando Guzman Lugo <fernando.lugo@xxxxxx>
+ * Suman Anna <s-anna@xxxxxx>
+ * Robert Tivy <rtivy@xxxxxx>
+ * Armando Uribe De Leon <x0095078@xxxxxx>
+ * Sjur BrÃndeland <sjur.brandeland@xxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/module.h>
+#include <linux/firmware.h>
+#include <linux/remoteproc.h>
+#include <linux/elf.h>
+
+#include "remoteproc_internal.h"
+
+/* make sure this fw image is sane */
+int
+rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw)
+{
+ const char *name = rproc->firmware;
+ struct device *dev = rproc->dev;
+ struct elf32_hdr *ehdr;
+ char class;
+
+ if (!fw) {
+ dev_err(dev, "failed to load %s\n", name);
+ return -EINVAL;
+ }
+
+ if (fw->size < sizeof(struct elf32_hdr)) {
+ dev_err(dev, "Image is too small\n");
+ return -EINVAL;
+ }
+
+ ehdr = (struct elf32_hdr *)fw->data;
+
+ /* We only support ELF32 at this point */
+ class = ehdr->e_ident[EI_CLASS];
+ if (class != ELFCLASS32) {
+ dev_err(dev, "Unsupported class: %d\n", class);
+ return -EINVAL;
+ }
+
+ /* We assume the firmware has the same endianess as the host */
+# ifdef __LITTLE_ENDIAN
+ if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB) {
+# else /* BIG ENDIAN */
+ if (ehdr->e_ident[EI_DATA] != ELFDATA2MSB) {
+# endif
+ dev_err(dev, "Unsupported firmware endianess\n");
+ return -EINVAL;
+ }
+
+ if (fw->size < ehdr->e_shoff + sizeof(struct elf32_shdr)) {
+ dev_err(dev, "Image is too small\n");
+ return -EINVAL;
+ }
+
+ if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) {
+ dev_err(dev, "Image is corrupted (bad magic)\n");
+ return -EINVAL;
+ }
+
+ if (ehdr->e_phnum == 0) {
+ dev_err(dev, "No loadable segments\n");
+ return -EINVAL;
+ }
+
+ if (ehdr->e_phoff > fw->size) {
+ dev_err(dev, "Firmware size is too small\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/**
+ * rproc_set_boot_addr() - Set rproc's boot address.
+ * @rproc: remote processor which needs boot address set.
+ * @fw: the the ELF firmware image
+ *
+ * This function reads the ELF entry point address and assign this
+ * to the rproc's boot address.
+ * Note that the boot address is not a configurable property of all remote
+ * processors. Some will always boot at a specific hard-coded address.
+ */
+void rproc_set_boot_addr(struct rproc *rproc, const struct firmware *fw)
+{
+ struct elf32_hdr *ehdr = (struct elf32_hdr *)fw->data;
+ rproc->bootaddr = ehdr->e_entry;
+}
+
+/**
+ * rproc_load_segments() - load firmware segments to memory
+ * @rproc: remote processor which will be booted using these fw segments
+ * @fw: the the ELF firmware image
+ *
+ * This function loads the firmware segments to memory, where the remote
+ * processor expects them.
+ *
+ * Some remote processors will expect their code and data to be placed
+ * 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
+ * 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.
+ *
+ * Currently we only support remote processors that required carveout
+ * allocations and got them mapped onto their iommus. Some processors
+ * might be different: they might not have iommus, and would prefer to
+ * directly allocate memory for every segment/resource. This is not yet
+ * supported, though.
+ */
+int
+rproc_load_segments(struct rproc *rproc, const struct firmware *fw)
+{
+ struct device *dev = rproc->dev;
+ struct elf32_hdr *ehdr;
+ struct elf32_phdr *phdr;
+ int i, ret = 0;
+ const u8 *elf_data = fw->data;
+
+ ehdr = (struct elf32_hdr *)elf_data;
+ phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff);
+
+ /* go through the available ELF segments */
+ for (i = 0; i < ehdr->e_phnum; i++, phdr++) {
+ u32 da = phdr->p_paddr;
+ u32 memsz = phdr->p_memsz;
+ u32 filesz = phdr->p_filesz;
+ u32 offset = phdr->p_offset;
+ void *ptr;
+
+ if (phdr->p_type != PT_LOAD)
+ continue;
+
+ 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%zx\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;
+}
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index f1ffabb..997e816 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -42,6 +42,7 @@
#include <linux/virtio.h>
#include <linux/completion.h>
#include <linux/idr.h>
+#include <linux/firmware.h>

/**
* struct resource_table - firmware resource table header
@@ -326,6 +327,15 @@ struct rproc_mem_entry {

struct rproc;

+int
+rproc_load_segments(struct rproc *rproc, const struct firmware *fw);
+struct resource_table *
+rproc_find_rsc_table(struct rproc *rproc, const struct firmware *fw,
+ int *tablesz);
+int
+rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw);
+void rproc_set_boot_addr(struct rproc *rproc, const struct firmware *fw);
+
/**
* struct rproc_ops - platform-specific device handlers
* @start: power on the device and boot it
@@ -462,6 +472,7 @@ int rproc_unregister(struct rproc *rproc);

int rproc_boot(struct rproc *rproc);
void rproc_shutdown(struct rproc *rproc);
+void *rproc_da_to_va(struct rproc *rproc, u64 da, int len);

static inline struct rproc_vdev *vdev_to_rvdev(struct virtio_device *vdev)
{
--
1.7.5.4

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