[U-Boot] [PATCH v2 2/2] common: Generic firmware loader for file system

[Lothar Waßmann]

Hi,

On Tue, 12 Dec 2017 15:27:14 +0800 tien.fong.chee at intel.com wrote:
> From: Tien Fong Chee <tien.fong.chee at intel.com>
> 
> This is file system generic loader which can be used to load
> the file image from the storage into target such as memory.
> The consumer driver would then use this loader to program whatever,
> ie. the FPGA device.
> 
> Signed-off-by: Tien Fong Chee <tien.fong.chee at intel.com>
> ---
>  common/Makefile     |   1 +
>  common/fs_loader.c  | 299 ++++++++++++++++++++++++++++++++++++++++++++++++++++
>  include/fs_loader.h |  30 ++++++
>  3 files changed, 330 insertions(+)
>  create mode 100644 common/fs_loader.c
>  create mode 100644 include/fs_loader.h
> 
> diff --git a/common/Makefile b/common/Makefile
> index cec506f..2934221 100644
> --- a/common/Makefile
> +++ b/common/Makefile
> @@ -130,3 +130,4 @@ obj-$(CONFIG_CMD_DFU) += dfu.o
>  obj-y += command.o
>  obj-y += s_record.o
>  obj-y += xyzModem.o
> +obj-y += fs_loader.o
> diff --git a/common/fs_loader.c b/common/fs_loader.c
> new file mode 100644
> index 0000000..fdb0fa2
> --- /dev/null
> +++ b/common/fs_loader.c
> @@ -0,0 +1,299 @@
> +/*
> + * Copyright (C) 2017 Intel Corporation <www.intel.com>
> + *
> + * SPDX-License-Identifier:    GPL-2.0
> + */
> +
> +#include <common.h>
> +#include <errno.h>
> +#include <fs.h>
> +#include <fs_loader.h>
> +#include <nand.h>
> +#include <sata.h>
> +#include <spi.h>
> +#include <spi_flash.h>
> +#include <spl.h>
> +#include <linux/string.h>
> +#include <usb.h>
> +
> +static struct device_location default_locations[] = {
> +	{
> +		.name = "mmc",
> +		.devpart = "0:1",
> +	},
> +	{
> +		.name = "usb",
> +		.devpart = "0:1",
> +	},
> +	{
> +		.name = "sata",
> +		.devpart = "0:1",
> +	},
> +};
> +
> +/* USB build is not supported yet in SPL */
> +#ifndef CONFIG_SPL_BUILD
> +#ifdef CONFIG_USB_STORAGE
> +static int init_usb(void)
> +{
> +	int err;
> +
> +	err = usb_init();
> +	if (err)
> +		return err;
> +
> +#ifndef CONFIG_DM_USB
> +	err = usb_stor_scan(1) < 0 ? -ENODEV : 0;
> +#endif
> +
> +	return err;
> +}
> +#else
> +static int init_usb(void)
> +{
> +	printf("Error: Cannot load flash image: no USB support\n");
> +	return -ENOSYS;
> +}
> +#endif
> +#endif
> +
> +#ifdef CONFIG_SATA
> +static int init_storage_sata(void)
> +{
> +	return sata_probe(0);
> +}
> +#else
> +static int init_storage_sata(void)
> +{
> +	printf("Error: Cannot load image: no SATA support\n");
> +	return -ENOSYS;
> +}
> +#endif
> +
> +#ifdef CONFIG_CMD_UBIFS
> +static int mount_ubifs(struct device_location *location)
> +{
> +	int ret;
> +	char cmd[32];
> +
> +	sprintf(cmd, "ubi part %s", location->mtdpart);
> +
> +	ret = run_command(cmd, 0);
> +	if (ret)
> +		return ret;
> +
> +	sprintf(cmd, "ubifsmount %s", location->ubivol);
> +
> +	ret = run_command(cmd, 0);
> +
> +	return ret;
> +}
> +
> +static int umount_ubifs(void)
> +{
> +	return run_command("ubifsumount", 0);
> +}
> +#else
> +static int mount_ubifs(struct device_location *location)
> +{
> +	printf("Error: Cannot load image: no UBIFS support\n");
> +	return -ENOSYS;
> +}
> +#endif
> +
> +#if defined(CONFIG_SPL_MMC_SUPPORT) && defined(CONFIG_SPL_BUILD)
> +static int init_mmc(void)
> +{
> +	/* Just for the case MMC is not yet initialized */
> +	struct mmc *mmc = NULL;
> +	int err;
> +
> +	spl_mmc_find_device(&mmc, spl_boot_device());
> +
> +	err = mmc_init(mmc);
> +	if (err) {
> +		printf("spl: mmc init failed with error: %d\n", err);
> +		return err;
> +	}
> +
> +	return err;
> +}
> +#else
> +static int init_mmc(void)
> +{
> +	/* Expect somewhere already initialize MMC */
> +	return 0;
> +}
> +#endif
> +
> +static int select_fs_dev(struct device_location *location)
> +{
> +	int ret = 0;
> +
You should not initialize 'ret' here, to make sure, that the compiler
barks at you if 'ret' is not appropriately set in each of the if/else
clauses below.

> +	if (!strcmp("mmc", location->name)) {
> +		ret = fs_set_blk_dev("mmc", location->devpart, FS_TYPE_ANY);
> +	}
> +	else if (!strcmp("usb", location->name)) {
>
'else' should be placed on the same line as the '}'.

> +		ret = fs_set_blk_dev("usb", location->devpart, FS_TYPE_ANY);
> +	}
> +	else if (!strcmp("sata", location->name)) {
> +		ret = fs_set_blk_dev("sata", location->devpart, FS_TYPE_ANY);
> +	}
> +	else if (!strcmp("ubi", location->name)) {
> +		if (location->ubivol != NULL)
> +			ret = fs_set_blk_dev("ubi", NULL, FS_TYPE_UBIFS);
> +		else
> +			ret = -ENODEV;
> +	}
> +	else {
> +		printf("Error: unsupported location storage.\n");
> +		return -ENODEV;
> +	}
> +
> +	if (ret)
> +		printf("Error: could not access storage.\n");
> +
> +	return ret;
> +}
> +
> +static int init_storage_device(struct device_location *location)
> +{
> +	int ret = 0;
> +#ifndef CONFIG_SPL_BUILD
> +	/* USB build is not supported yet in SPL */
> +	if (!strcmp("usb", location->name))
> +		ret = init_usb();
> +#endif
> +
> +	if (!strcmp("mmc", location->name))
> +		ret = init_mmc();
> +
> +	if (!strcmp("sata", location->name))
> +		ret = init_storage_sata();
> +
> +	if (location->ubivol != NULL)
> +		ret = mount_ubifs(location);
> +
> +	return ret;
>
Is it intended to return 0 (success) here, if none of the if clauses is
true (no supported storage device is available)?

> +}
> +
> +static void set_storage_devpart(char *name, char *devpart)
> +{
> +	size_t i;
> +
> +	for (i = 0; i < ARRAY_SIZE(default_locations); i++) {
> +		if (!strcmp(default_locations[i].name, name))
> +			default_locations[i].devpart = devpart;
> +	}
> +
> +	return;
>
useless return statement.

> +}
> +
> +/*
> + * Prepare firmware struct;
> + * return -ve if fail.
> + */
> +static int _request_firmware_prepare(struct firmware **firmware_p,
> +				     const char *name, void *dbuf,
> +				     size_t size, u32 offset)
> +{
> +	struct firmware *firmware = NULL;
> +	int ret = 0;
> +
'ret' is not required any more.

> +	*firmware_p = NULL;
> +
> +	if (!name || name[0] == '\0')
> +		return -EINVAL;
> +
> +	*firmware_p = firmware = calloc(1, sizeof(*firmware));
> +
> +	if (!firmware) {
> +		printf("%s: calloc(struct firmware) failed\n", __func__);
> +		return -ENOMEM;
> +	}
> +
> +	firmware->name = name;
> +	firmware->data = dbuf;
> +	firmware->size = size;
> +	firmware->offset = offset;
> +
> +	return ret;
> +}
> +
> +/*
> + * fw_get_filesystem_firmware - load firmware into a allocated buffer
>
<nit>'into an allocated'</nit>

> + * @firmware_p: pointer to firmware image
> + * @location: An array of supported firmware location
> + *
> + * @return: size of total read
> + *	    -ve when error
> + */
> +static int fw_get_filesystem_firmware(struct device_location *location,
> +				      struct firmware *firmware_p)
> +{
> +	loff_t actread;
> +	char *dev_part;
> +	int ret;
> +
> +	dev_part = env_get("FW_DEV_PART");
> +	if (dev_part)
> +		set_storage_devpart(location->name, dev_part);
> +
> +	ret = init_storage_device(location);
> +	if (ret)
> +		goto out;
> +
> +	select_fs_dev(location);
> +
select_fs_dev() may fail. You should check its return value here!

> +	ret = fs_read(firmware_p->name, (ulong)firmware_p->data,
> +		      firmware_p->offset, firmware_p->size, &actread);
> +
> +	if (ret || (actread != firmware_p->size)) {
> +		printf("Error: %d Failed to read %s from flash %lld ",
> +		      ret,
> +		      firmware_p->name,
> +		      actread);
> +		printf("!= %d.\n", firmware_p->size);
>
You should not split this message into multiple printf's.

> +		return -EPERM;
>
That's definitely not the right return code in this situation.
If 'ret' is != 0 you should return 'ret', otherwise EIO is more
appropriate here.

> +		} else {
> +			ret = actread;
> +		}
>
broken indentation!

> +
> +out:
> +#ifdef CONFIG_CMD_UBIFS
> +	if (location->ubivol != NULL)
> +		umount_ubifs();
> +#endif
> +
> +	return ret;
> +}
> +
> +/*
> + * request_firmware_into_buf - load firmware into a previously allocated buffer
> + * @firmware_p: pointer to firmware image
> + * @name: name of firmware file
> + * @buf: address of buffer to load firmware into
> + * @size: size of buffer
> + * @offset: offset of a file for start reading
> + *
> + * This firmware is loaded directly into the buffer pointed to by @buf and
> + * the @firmware_p data member is pointed at @buf.
> + *
> + * @return: size of total read
> + *	    -ve when error
> + */
> +int request_firmware_into_buf(struct firmware **firmware_p,
> +			      const char *name,
> +			      struct device_location *location,
> +			      void *buf, size_t size, u32 offset)
> +{
> +	int ret;
> +
> +	ret = _request_firmware_prepare(firmware_p, name, buf, size, offset);
> +	if (ret < 0) /* error */
> +		return ret;
> +
> +	ret = fw_get_filesystem_firmware(location, *firmware_p);
> +
> +	return ret;
> +}
> diff --git a/include/fs_loader.h b/include/fs_loader.h
> new file mode 100644
> index 0000000..dacc1f3
> --- /dev/null
> +++ b/include/fs_loader.h
> @@ -0,0 +1,30 @@
> +/*
> + * Copyright (C) 2017 Intel Corporation <www.intel.com>
> + *
> + * SPDX-License-Identifier:    GPL-2.0
> + */
> +#ifndef _FS_LOADER_H_
> +#define _FS_LOADER_H_
> +
> +#include <linux/types.h>
> +
> +struct firmware {
> +	size_t size;		/* Size of a file */
> +	const u8 *data;		/* Buffer for file */
> +	const char *name;	/* Filename */
> +	u32 offset;		/* Offset of reading a file */
>
IMO the last two members would belong into a private data structure of
the firmware loader pointed to by the priv field below.
> +	void *priv;		/* Firmware loader private fields */
> +};



Lothar Waßmann
-- 
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