linux-kernel - Re: [PATCH 1/5] cxl/acpi: Set ACPI's CXL

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Message-ID: <ee923e4d-c2c7-a9a5-5b83-64138d052ce1@amd.com>
Date:   Tue, 25 Oct 2022 11:23:21 -0500
From:   Terry Bowman <Terry.Bowman@....com>
To:     Dan Williams <dan.j.williams@...el.com>,
        alison.schofield@...el.com, vishal.l.verma@...el.com,
        dave.jiang@...el.com, ira.weiny@...el.com, bwidawsk@...nel.org
Cc:     linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org,
        bhelgaas@...gle.com, rafael@...nel.org, lenb@...nel.org,
        Jonathan.Cameron@...wei.com, dave@...olabs.net, rrichter@....com,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH 1/5] cxl/acpi: Set ACPI's CXL _OSC to indicate CXL1.1
 support



On 10/21/22 17:39, Dan Williams wrote:
> Terry Bowman wrote:
>> ACPI includes a CXL _OSC support method to communicate the available
>> CXL support to FW. The CXL support _OSC includes a field to indicate
>> CXL1.1 RCH RCD support. The OS sets this bit to 1 if it supports access
>> to RCD and RCH Port registers.[1] FW can potentially change it's operation
>> depending on the _OSC support setting reported by the OS.
>>
>> The ACPI driver does not currently set the ACPI _OSC support to indicate
>> CXL1.1 RCD RCH support. Change the capability reported to include CXL1.1.
>>
>> [1] CXL3.0 Table 9-26 'Interpretation of CXL _OSC Support Field'
>>
>> Signed-off-by: Terry Bowman <terry.bowman@....com>
>> ---
>>  drivers/acpi/pci_root.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
>> index c8385ef54c37..094a59b216ae 100644
>> --- a/drivers/acpi/pci_root.c
>> +++ b/drivers/acpi/pci_root.c
> 
> Be sure to copy linux-acpi@...r.kernel.org on patches that touch
> drivers/acpi/
> 

Ok, I will.

Regards,
Terry

>> @@ -492,6 +492,7 @@ static u32 calculate_cxl_support(void)
>>  	u32 support;
>>  
>>  	support = OSC_CXL_2_0_PORT_DEV_REG_ACCESS_SUPPORT;
>> +	support |= OSC_CXL_1_1_PORT_REG_ACCESS_SUPPORT;
>>  	if (pci_aer_available())
>>  		support |= OSC_CXL_PROTOCOL_ERR_REPORTING_SUPPORT;
>>  	if (IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE))
> 
> This looks good to me though.