linux-kernel - Re: [PATCH 13/26] cxl/mem: Configure dynamic capacity interrupts

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Date: Tue, 9 Apr 2024 22:26:59 -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 13/26] cxl/mem: Configure dynamic capacity interrupts

Dave Jiang wrote:
> 
> 
> On 3/24/24 4:18 PM, ira.weiny@...el.com wrote:
> > From: Navneet Singh <navneet.singh@...el.com>
> > 
> > Dynamic Capacity Devices (DCD) support extent change notifications
> > through the event log mechanism.  The interrupt mailbox commands were
> > extended in CXL 3.1 to support these notifications.
> > 
> > Firmware can't configure DCD events to be FW controlled but can retain
> > control of memory events.  Split irq configuration of memory events and
> > DCD events to allow for FW control of memory events while DCD is host
> > controlled.
> > 
> > Configure DCD event log interrupts on devices supporting dynamic
> > capacity.  Disable DCD if interrupts are not supported.
> > 
> > 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>
> 
> A few minor comments. The rest LGTM.
> > 
> > ---
> > Changes for v1
> > [iweiny: rebase to upstream irq code]
> > [iweiny: disable DCD if irqs not supported]
> > ---
> >  drivers/cxl/core/mbox.c |  9 ++++++-
> >  drivers/cxl/cxl.h       |  4 ++-
> >  drivers/cxl/cxlmem.h    |  4 +++
> >  drivers/cxl/pci.c       | 71 ++++++++++++++++++++++++++++++++++++++++---------
> >  4 files changed, 74 insertions(+), 14 deletions(-)
> > 
> > diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
> > index 14e8a7528a8b..58b31fa47b93 100644
> > --- a/drivers/cxl/core/mbox.c
> > +++ b/drivers/cxl/core/mbox.c
> > @@ -1323,10 +1323,17 @@ static int cxl_get_dc_config(struct cxl_memdev_state *mds, u8 start_region,
> >  	return rc;
> >  }
> >  
> > -static bool cxl_dcd_supported(struct cxl_memdev_state *mds)
> > +bool cxl_dcd_supported(struct cxl_memdev_state *mds)
> >  {
> >  	return test_bit(CXL_DCD_ENABLED_GET_CONFIG, mds->dcd_cmds);
> >  }
> > +EXPORT_SYMBOL_NS_GPL(cxl_dcd_supported, CXL);
> > +
> > +void cxl_disable_dcd(struct cxl_memdev_state *mds)
> > +{
> > +	clear_bit(CXL_DCD_ENABLED_GET_CONFIG, mds->dcd_cmds);
> > +}
> > +EXPORT_SYMBOL_NS_GPL(cxl_disable_dcd, CXL);
> 
> Should these one-liners just go into a header file?

Yea they could.

> 
> >  
> >  /**
> >   * cxl_dev_dynamic_capacity_identify() - Reads the dynamic capacity
> > diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
> > index 15d418b3bc9b..d585f5fdd3ae 100644
> > --- a/drivers/cxl/cxl.h
> > +++ b/drivers/cxl/cxl.h
> > @@ -164,11 +164,13 @@ static inline int ways_to_eiw(unsigned int ways, u8 *eiw)
> >  #define CXLDEV_EVENT_STATUS_WARN		BIT(1)
> >  #define CXLDEV_EVENT_STATUS_FAIL		BIT(2)
> >  #define CXLDEV_EVENT_STATUS_FATAL		BIT(3)
> > +#define CXLDEV_EVENT_STATUS_DCD			BIT(4)
> 
> extra tab?

It does not look like it on my end...  :-/

#define CXLDEV_DEV_EVENT_STATUS_OFFSET>->-------0x00$
#define CXLDEV_EVENT_STATUS_INFO>------->-------BIT(0)$
#define CXLDEV_EVENT_STATUS_WARN>------->-------BIT(1)$
#define CXLDEV_EVENT_STATUS_FAIL>------->-------BIT(2)$
#define CXLDEV_EVENT_STATUS_FATAL>------>-------BIT(3)$
#define CXLDEV_EVENT_STATUS_DCD>>------->-------BIT(4)$


Ira