Received-SPF: pass (google.com: domain of linux-kernel+bounces-121710-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) client-ip=2604:1380:45e3:2400::1;
Message-ID: <4e24a03c-f557-4323-a836-ed01f72a3055@intel.com>
Date: Wed, 27 Mar 2024 10:41:05 -0700
Precedence: bulk
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH 12/26] cxl/pci: Factor out interrupt policy check
Content-Language: en-US
To: Ira Weiny <ira.weiny@intel.com>, Fan Ni <fan.ni@samsung.com>,
 Jonathan Cameron <Jonathan.Cameron@huawei.com>,
 Navneet Singh <navneet.singh@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>,
 Davidlohr Bueso <dave@stgolabs.net>,
 Alison Schofield <alison.schofield@intel.com>,
 Vishal Verma <vishal.l.verma@intel.com>, linux-btrfs@vger.kernel.org,
 linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20240324-dcd-type2-upstream-v1-0-b7b00d623625@intel.com>
 <20240324-dcd-type2-upstream-v1-12-b7b00d623625@intel.com>
From: Dave Jiang <dave.jiang@intel.com>
In-Reply-To: <20240324-dcd-type2-upstream-v1-12-b7b00d623625@intel.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit


On 3/24/24 4:18 PM, Ira Weiny wrote:
> Dynamic capacity devices (DCD) require interrupts to notify the host of
> events in the DCD log.  The interrupts for DCD may be supported despite
> FW control of memory event logs.
> 
> Prepare to support DCD event interrupts separate from other event
> interrupts by factoring out the check for event interrupt settings.
> 
> Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
> 
> ---
> Changes for V3:
> [iweiny: new patch]
> ---
>  drivers/cxl/pci.c | 23 ++++++++++++++++-------
>  1 file changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
> index ccaf4ad26a4f..12cd5d399230 100644
> --- a/drivers/cxl/pci.c
> +++ b/drivers/cxl/pci.c
> @@ -738,6 +738,21 @@ static bool cxl_event_int_is_fw(u8 setting)
>  	return mode == CXL_INT_FW;
>  }
>  
> +static bool cxl_event_validate_mem_policy(struct cxl_memdev_state *mds,
> +					  struct cxl_event_interrupt_policy *policy)
> +{
> +	if (cxl_event_int_is_fw(policy->info_settings) ||
> +	    cxl_event_int_is_fw(policy->warn_settings) ||
> +	    cxl_event_int_is_fw(policy->failure_settings) ||
> +	    cxl_event_int_is_fw(policy->fatal_settings)) {
> +		dev_err(mds->cxlds.dev,
> +			"FW still in control of Event Logs despite _OSC settings\n");
> +		return false;
> +	}
> +
> +	return true;
> +}
> +
>  static int cxl_event_config(struct pci_host_bridge *host_bridge,
>  			    struct cxl_memdev_state *mds, bool irq_avail)
>  {
> @@ -760,14 +775,8 @@ static int cxl_event_config(struct pci_host_bridge *host_bridge,
>  	if (rc)
>  		return rc;
>  
> -	if (cxl_event_int_is_fw(policy.info_settings) ||
> -	    cxl_event_int_is_fw(policy.warn_settings) ||
> -	    cxl_event_int_is_fw(policy.failure_settings) ||
> -	    cxl_event_int_is_fw(policy.fatal_settings)) {
> -		dev_err(mds->cxlds.dev,
> -			"FW still in control of Event Logs despite _OSC settings\n");
> +	if (!cxl_event_validate_mem_policy(mds, &policy))
>  		return -EBUSY;
> -	}
>  
>  	rc = cxl_event_config_msgnums(mds, &policy);
>  	if (rc)
>