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

[Chee, Tien Fong <tien.fong.chee@intel.com>]

On Sel, 2017-12-12 at 09:14 +0100, Lothar Waßmann wrote:
> Hi,
> 
> On Tue, 12 Dec 2017 15:27:14 +0800 tien.fong.chee at intel.com wrote:
> > 
> > From: Tien Fong Chee <tien.fong.chee@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@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.
> 
Okay.

> > 
> > +	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 '}'.
> 
Okay.
> > 
> > +		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)?
> 
Okay, i will add error return if there is 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.
> 
Okay.
> > 
> > +}
> > +
> > +/*
> > + * 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.
> 
okay.
> > 
> > +	*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>
> 
okay.
> > 
> > + * @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!
> 
okay.
> > 
> > +	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.
> 
okay.
> > 
> > +		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!
> 
okay.
> > 
> > 
> > +
> > +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.
okay.
> > +	void *priv;		/* Firmware loader private
> > fields */
> > +};
> 
> 
> Lothar Waßmann