linux-kernel - RE: [PATCH 01/31] usb: usbssp: Defined register maps and other useful structures.

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Date:   Thu, 12 Jul 2018 19:20:54 +0000
From:   Pawel Laszczak <pawell@...ence.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        Felipe Balbi <balbi@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Lukasz Tyrala <ltyrala@...ence.com>,
        Alan Douglas <adouglas@...ence.com>
Subject: RE: [PATCH 01/31] usb: usbssp: Defined register maps and other useful
 structures.

> > +/**
> > + * struct usbssp_cap_regs - USBSSP Registers.
> > + * @hc_capbase:		length of the capabilities register and DC
> version number
> > + * @hcs_params1:	HCSPARAMS1 - Structural Parameters 1
> > + * @hcs_params2:	HCSPARAMS2 - Structural Parameters 2
> > + * @hcs_params3:	HCSPARAMS3 - Structural Parameters 3
> > + * @hcc_params:		HCCPARAMS - Capability Parameters
> > + * @db_off:		DBOFF - Doorbell array offset
> > + * @run_regs_off:	RTSOFF - Runtime register space offset
> > + * @hcc_params2:	HCCPARAMS2 Capability Parameters 2,
> > + */
> > +struct usbssp_cap_regs {
> > +	__le32	hc_capbase;
> > +	__le32	hcs_params1;
> > +	__le32	hcs_params2;
> > +	__le32	hcs_params3;
> > +	__le32	hcc_params;
> > +	__le32	db_off;
> > +	__le32	run_regs_off;
> > +	__le32	hcc_params2;
> > +	/* Reserved up to (CAPLENGTH - 0x1C) */ };
> 
> Does this, and your other structures that map to hardware, need to be
> __packed?

These structures don't need to be __packed. All fields in structures 
that map to hardware are 32 and 64 bits. 
It has been working this way in XHCI driver for years. 

thanks,

Pawel Laszczak