linux-kernel - Re: [PATCH 01/26] cxl/mbox: Flag support for Dynamic Capacity Devices (DCD)

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Date: Tue, 2 Apr 2024 15:30:22 -0700
From: Ira Weiny <ira.weiny@...el.com>
To: Dave Jiang <dave.jiang@...el.com>, <ira.weiny@...el.com>, Fan Ni
	<fan.ni@...sung.com>, Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	"Navneet Singh" <navneet.singh@...el.com>
CC: Dan Williams <dan.j.williams@...el.com>, Davidlohr Bueso
	<dave@...olabs.net>, Alison Schofield <alison.schofield@...el.com>, "Vishal
 Verma" <vishal.l.verma@...el.com>, <linux-btrfs@...r.kernel.org>,
	<linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/26] cxl/mbox: Flag support for Dynamic Capacity
 Devices (DCD)

Dave Jiang wrote:
> 
> 
> On 3/24/24 4:18 PM, ira.weiny@...el.com wrote:
> > From: Navneet Singh <navneet.singh@...el.com>
> > 
> > Per the CXL 3.1 specification software must check the Command Effects
> > Log (CEL) to know if a device supports dynamic capacity (DC).  If the
> > device does support DC the specifics of the DC Regions (0-7) are read
> > through the mailbox.
> > 
> > Flag DC Device (DCD) commands in a device if they are supported.
> > Subsequent patches will key off these bits to configure DCD.
> > 
> > Signed-off-by: Navneet Singh <navneet.singh@...el.com>
> > Co-developed-by: Ira Weiny <ira.weiny@...el.com>
> > Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> 
> Reviewed-by: Dave Jiang <dave.jiang@...el.com>
> 
> small formatting nit below
> 
> > ---
> > Changes for v1
> > [iweiny: update to latest master]
> > [iweiny: update commit message]
> > [iweiny: Based on the fix:
> > 	https://lore.kernel.org/all/20230903-cxl-cel-fix-v1-1-e260c9467be3@intel.com/
> > [jonathan: remove unneeded format change]
> > [jonathan: don't split security code in mbox.c]
> > ---
> >  drivers/cxl/core/mbox.c | 33 +++++++++++++++++++++++++++++++++
> >  drivers/cxl/cxlmem.h    | 15 +++++++++++++++
> >  2 files changed, 48 insertions(+)
> > 
> > diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
> > index 9adda4795eb7..ed4131c6f50b 100644
> > --- a/drivers/cxl/core/mbox.c
> > +++ b/drivers/cxl/core/mbox.c
> > @@ -161,6 +161,34 @@ static void cxl_set_security_cmd_enabled(struct cxl_security_state *security,
> >  	}
> >  }
> >  
> > +static bool cxl_is_dcd_command(u16 opcode)
> > +{
> > +#define CXL_MBOX_OP_DCD_CMDS 0x48
> > +
> > +	return (opcode >> 8) == CXL_MBOX_OP_DCD_CMDS;
> > +}
> > +
> > +static void cxl_set_dcd_cmd_enabled(struct cxl_memdev_state *mds,
> > +					u16 opcode)
> 
> This seems misaligned.

Fixed,
Ira