[U-Boot] [PATCH v4 2/2] common: Generic firmware loader for file system

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

On Isn, 2017-12-18 at 08:39 +0100, Lothar Waßmann wrote:
> Hi,
> 
> On Mon, 18 Dec 2017 13:10:56 +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         | 311
> > +++++++++++++++++++++++++++++++++++++++++++++
> >  doc/README.firmware_loader |  77 +++++++++++
> >  include/fs_loader.h        |  28 ++++
> >  4 files changed, 417 insertions(+)
> >  create mode 100644 common/fs_loader.c
> >  create mode 100644 doc/README.firmware_loader
> >  create mode 100644 include/fs_loader.h
> > 
> [...]
> > 
> > diff --git a/common/fs_loader.c b/common/fs_loader.c
> > new file mode 100644
> > index 0000000..81cf5d6
> > --- /dev/null
> > +++ b/common/fs_loader.c
> [...]
> > 
> > +/*
> > + * 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;
> > +	struct firmware_priv *fw_priv = NULL;
> > +
> > +	*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;
> > +	}
> > +
> > +	fw_priv = calloc(1, sizeof(*fw_priv));
> > +
> > +	if (!fw_priv) {
> > +		printf("%s: calloc(struct fw_priv) failed\n",
> > __func__);
> > +		return -ENOMEM;
> What about freeing 'firmware' and NULLing *firmware_p here?
There is no "freeing" support in U-Boot. I can assign NULL
to *firmware_p.
> Or better, do the assignment of *firmware_p at the end.
Are you means switch the location between *firmware_p and fw_priv in
calloc?
> 
> > 
> > +	}
> > +
> > +	fw_priv->name = name;
> > +	fw_priv->offset = offset;
> > +	firmware->data = dbuf;
> > +	firmware->size = size;
> > +	firmware->priv = fw_priv;
> > +
> > +	return 0;
> > +}
> > +
> > +/*
> > + * fw_get_filesystem_firmware - load firmware into an allocated
> > buffer
> > + * @location: An array of supported firmware location
> > + * @firmware_p: pointer to firmware image
> > + *
> > + * @return: size of total read
> > + *	    -ve when error
> > + */
> > +static int fw_get_filesystem_firmware(struct device_location
> > *location,
> > +				      struct firmware *firmware_p)
> > +{
> > +	struct firmware_priv *fw_priv = NULL;
> > +	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);
> > +	if (ret)
> > +		goto out;
> > +
> > +	fw_priv = (struct firmware_priv *)firmware_p->priv;
> > +
> useless type cast.
> 
I assume you are saying autocast, right? Let me check is there any
warning from compiler after removing the cast.
> > 
> > +	ret = fs_read(fw_priv->name, (ulong)firmware_p->data,
> > fw_priv->offset,
> > +		     firmware_p->size, &actread);
> > +
> > +	if (ret || (actread != firmware_p->size)) {
> > +		printf("Error: %d Failed to read %s from flash
> > %lld != %d.\n",
> > +		      ret, fw_priv->name, actread, firmware_p-
> > >size);
> > +		return -EPERM;
> Quoting myself from an earlier mail
> (20171212091442.2f6826fe at karo-electronics.de):
> > 
> > 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.
> 
Sorry for mising out this part. I would change that.
> 
> Lothar Waßmann