Probably here: https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html in the usb-storage.quirks section? I assume there's also a header file that defines all this stuff? David -----Original Message----- From: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> Sent: 09 December 2020 12:04 To: Oliver Neukum <oneukum@xxxxxxxx> Cc: linux-usb@xxxxxxxxxxxxxxx; david.partridge@xxxxxxxxxxxxx Subject: Re: [PATCH] USB: UAS: introduce a quirk to set no_write_same On Wed, Dec 09, 2020 at 12:07:34PM +0100, Oliver Neukum wrote: > UAS does not share the pessimistic assumption storage > is making that devices cannot deal with WRITE_SAME. > A few devices supported by UAS, are reported to not > deal well with WRITE_SAME. Those need a quirk. > > Add it to the device that needs it. > > Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx> > Reported-by: David C. Partridge <david.partridge@xxxxxxxxxxxxx> > --- > drivers/usb/storage/uas.c | 3 +++ > drivers/usb/storage/unusual_uas.h | 7 +++++-- > drivers/usb/storage/usb.c | 3 +++ > include/linux/usb_usual.h | 2 ++ > 4 files changed, 13 insertions(+), 2 deletions(-) > > diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c > index 56422c4b4ff3..bef89c6bd1d7 100644 > --- a/drivers/usb/storage/uas.c > +++ b/drivers/usb/storage/uas.c > @@ -868,6 +868,9 @@ static int uas_slave_configure(struct scsi_device *sdev) > if (devinfo->flags & US_FL_NO_READ_CAPACITY_16) > sdev->no_read_capacity_16 = 1; > > + /* Some disks cannot handle WRITE_SAME */ > + if (devinfo->flags & US_FL_NO_SAME) > + sdev->no_write_same = 1; > /* > * Some disks return the total number of blocks in response > * to READ CAPACITY rather than the highest block number. > diff --git a/drivers/usb/storage/unusual_uas.h b/drivers/usb/storage/unusual_uas.h > index 711ab240058c..870e9cf3d5dc 100644 > --- a/drivers/usb/storage/unusual_uas.h > +++ b/drivers/usb/storage/unusual_uas.h > @@ -35,12 +35,15 @@ UNUSUAL_DEV(0x054c, 0x087d, 0x0000, 0x9999, > USB_SC_DEVICE, USB_PR_DEVICE, NULL, > US_FL_NO_REPORT_OPCODES), > > -/* Reported-by: Julian Groß <julian.g@xxxxxxxxx> */ > +/* > + * Initially Reported-by: Julian Groß <julian.g@xxxxxxxxx> > + * Further reports David C. Partridge <david.partridge@xxxxxxxxxxxxx> > + */ > UNUSUAL_DEV(0x059f, 0x105f, 0x0000, 0x9999, > "LaCie", > "2Big Quadra USB3", > USB_SC_DEVICE, USB_PR_DEVICE, NULL, > - US_FL_NO_REPORT_OPCODES), > + US_FL_NO_REPORT_OPCODES | US_FL_NO_SAME), > > /* > * Apricorn USB3 dongle sometimes returns "USBSUSBSUSBS" in response to SCSI > diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c > index 94a64729dc27..90aa9c12ffac 100644 > --- a/drivers/usb/storage/usb.c > +++ b/drivers/usb/storage/usb.c > @@ -541,6 +541,9 @@ void usb_stor_adjust_quirks(struct usb_device *udev, unsigned long *fflags) > case 'j': > f |= US_FL_NO_REPORT_LUNS; > break; > + case 'k': > + f |= US_FL_NO_SAME; > + break; Shouldn't this new flag be documented somewhere? thanks, greg k-h
