On 10/10/2024 3:49 AM, Ira Weiny wrote:
> Li, Ming4 wrote:
>> On 10/8/2024 7:16 AM, ira.we...@intel.com wrote:
>>> From: Navneet Singh
>>>
[snip]
>>> +static int cxl_send_dc_response(struct cxl_memdev_state *mds, int opcode,
>>> +
On 10/8/2024 7:16 AM, ira.we...@intel.com wrote:
> From: Navneet Singh
>
> A dynamic capacity device (DCD) sends events to signal the host for
> changes in the availability of Dynamic Capacity (DC) memory. These
> events contain extents describing a DPA range and meta data for memory
> to be adde
On 8/16/2024 10:44 PM, Ira Weiny wrote:
> cxl_dpa_to_region() finds the region from a tuple.
> The search involves finding the device endpoint decoder as well.
>
> Dynamic capacity extent processing uses the endpoint decoder HPA
> information to calculate the HPA offset. In addition, well behaved
On 8/16/2024 10:44 PM, ira.we...@intel.com wrote:
> From: Navneet Singh
>
> 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 D
On 8/16/2024 10:44 PM, Ira Weiny wrote:
> Dynamic Capacity Devices (DCD) require event interrupts to process
> memory addition or removal. BIOS may have control over non-DCD event
> processing. DCD interrupt configuration needs to be separate from
> memory event interrupt configuration.
>
> Facto
On 8/16/2024 10:44 PM, Ira Weiny wrote:
> Dynamic Capacity Devices (DCD) require event interrupts to process
> memory addition or removal. BIOS may have control over non-DCD event
> processing. DCD interrupt configuration needs to be separate from
> memory event interrupt configuration.
>
> Split
On 8/16/2024 10:44 PM, Ira Weiny wrote:
> create_pmem_region_store() and create_ram_region_store() are identical
> with the exception of the region mode. With the addition of DC region
> mode this would end up being 3 copies of the same code.
>
> Refactor create_pmem_region_store() and create_ram_
On 8/16/2024 10:44 PM, ira.we...@intel.com wrote:
> From: Navneet Singh
>
> One or more decoders each pointing to a Dynamic Capacity (DC) partition
> form a CXL software region. The region mode reflects composition of
> that entire software region. Decoder mode reflects a specific DC
> partition
On 8/16/2024 10:44 PM, ira.we...@intel.com wrote:
> From: Navneet Singh
>
> Until now region modes and decoder modes were equivalent in that both
> modes were either PMEM or RAM. The addition of Dynamic
> Capacity partitions defines up to 8 DC partitions per device.
>
> The region mode is thus no
On 8/16/2024 10:44 PM, ira.we...@intel.com wrote:
> From: Navneet Singh
>
> Per the CXL 3.1 specification software must check the Command Effects
> Log (CEL) for dynamic capacity command support.
>
> Detect support for the DCD commands while reading the CEL, including:
>
> Get DC Config
>
On 8/16/2024 10:44 PM, Ira Weiny wrote:
> The event buffer does not need to be allocated if something has failed in
> setting up event irq's.
>
> In prep for adjusting event configuration for DCD events move the buffer
> allocation to the end of the event configuration.
>
> Reviewed-by: Davidlohr B
On 8/16/2024 10:44 PM, ira.we...@intel.com wrote:
> From: Navneet Singh
>
> A dynamic capacity device (DCD) sends events to signal the host for
> changes in the availability of Dynamic Capacity (DC) memory. These
> events contain extents describing a DPA range and meta data for memory
> to be add
On 8/16/2024 10:44 PM, ira.we...@intel.com wrote:
> From: Navneet Singh
>
> Dynamic Capacity CXL regions must allow memory to be added or removed
> dynamically. In addition to the quantity of memory available the
> location of the memory within a DC partition is dynamic based on the
> extents off
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