Hi Pavel,
> On Oct 24, 2014, at 1:52 PM, Pavel Machek <pavel@xxxxxxx> wrote:
>
> Hi!
>
>> * /sys/class/fpga_manager/<fpga>/firmware
>> Name of FPGA image file to load using firmware class.
>> $ echo image.rbf > /sys/class/fpga_manager/<fpga>/firmware
>
> I .. still don't think this is good idea. What about namespaces?
> The path corresponds to path in which namespace?
>
FWIW the overlays patchset uses binary configfs attribute to make this work.
>> +int fpga_mgr_write(struct fpga_manager *mgr, const char *buf, size_t count)
>> +{
>> + int ret;
>> +
>> + if (test_and_set_bit_lock(FPGA_MGR_BUSY, &mgr->flags))
>> + return -EBUSY;
>> +
>> + dev_info(mgr->dev, "writing buffer to %s\n", mgr->name);
>> +
>> + ret = __fpga_mgr_write(mgr, buf, count);
>> + clear_bit_unlock(FPGA_MGR_BUSY, &mgr->flags);
>> +
>> + return ret;
>> +}
>> +EXPORT_SYMBOL_GPL(fpga_mgr_write);
>
> Is the EBUSY -- userspace please try again, but you don't know when to
> try again -- right interface? I mean, normally kernel would wait, so
> that userland does not have to poll?
>
>> +static ssize_t fpga_mgr_firmware_store(struct device *dev,
>> + struct device_attribute *attr,
>> + const char *buf, size_t count)
>> +{
>> + struct fpga_manager *mgr = dev_get_drvdata(dev);
>> + unsigned int len;
>> + char image_name[NAME_MAX];
>> + int ret;
>> +
>> + /* lose terminating \n */
>> + strcpy(image_name, buf);
>> + len = strlen(image_name);
>> + if (image_name[len - 1] == '\n')
>> + image_name[len - 1] = 0;
>> +
>> + ret = fpga_mgr_firmware_write(mgr, image_name);
>> + if (ret)
>> + return ret;
>> +
>> + return count;
>> +}
>
> This shows why the interface is not right... Valid filename may
> contain \n, right? It may even end with \n.
>
I could argue that a valid firmware file is one that’s well formed and does not
contain those characters.
I guess this is only for make echo file >foo work. You could specify that echo -n file >foo is
required.
> Best regards,
> Pavel
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
Regards
— Pantelis
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