From: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
To: Ira Weiny <ira.weiny@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>,
Navneet Singh <navneet.singh@intel.com>,
Fan Ni <fan.ni@samsung.com>, Davidlohr Bueso <dave@stgolabs.net>,
Dave Jiang <dave.jiang@intel.com>,
Alison Schofield <alison.schofield@intel.com>,
Vishal Verma <vishal.l.verma@intel.com>,
<linux-cxl@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH RFC v2 08/18] cxl/region: Add Dynamic Capacity CXL region support
Date: Tue, 29 Aug 2023 16:19:48 +0100 [thread overview]
Message-ID: <20230829161948.0000556c@Huawei.com> (raw)
In-Reply-To: <20230604-dcd-type2-upstream-v2-8-f740c47e7916@intel.com>
On Mon, 28 Aug 2023 22:20:59 -0700
Ira Weiny <ira.weiny@intel.com> wrote:
> CXL devices optionally support dynamic capacity. CXL Regions must be
> configured correctly to access this capacity. Similar to ram and pmem
> partitions, DC Regions represent different partitions of the DPA space.
>
> Interleaving is deferred due to the complexity of managing extents on
> multiple devices at the same time. However, there is nothing which
> directly prevents interleave support at this time. The check allows
> for early rejection.
>
> To maintain backwards compatibility with older software, CXL regions
> need a default DAX device to hold the reference for the region until it
> is deleted.
>
> Add create_dc_region sysfs entry to create DC regions. Share the logic
> of devm_cxl_add_dax_region() and region_is_system_ram(). Special case
> DC capable CXL regions to create a 0 sized seed DAX device until others
> can be created on dynamic space later.
>
> Flag dax_regions to indicate 0 capacity available until dax_region
> extents are supported by the region.
>
> Co-developed-by: Navneet Singh <navneet.singh@intel.com>
> Signed-off-by: Navneet Singh <navneet.singh@intel.com>
> Signed-off-by: Ira Weiny <ira.weiny@intel.com>
>
LGTM
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
next prev parent reply other threads:[~2023-08-29 15:20 UTC|newest]
Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-29 5:20 [PATCH RFC v2 00/18] DCD: Add support for Dynamic Capacity Devices (DCD) Ira Weiny
2023-08-29 5:20 ` [PATCH RFC v2 01/18] cxl/hdm: Debug, use decoder name function Ira Weiny
2023-08-29 14:03 ` Jonathan Cameron
2023-08-29 21:48 ` Fan Ni
2023-09-03 2:55 ` Ira Weiny
2023-08-30 20:32 ` Dave Jiang
2023-08-29 5:20 ` [PATCH RFC v2 02/18] cxl/mbox: Flag support for Dynamic Capacity Devices (DCD) Ira Weiny
2023-08-29 14:07 ` Jonathan Cameron
2023-09-03 3:38 ` Ira Weiny
2023-08-29 21:49 ` Fan Ni
2023-08-30 20:33 ` Dave Jiang
2023-10-24 16:16 ` Jonathan Cameron
2023-08-29 5:20 ` [PATCH RFC v2 03/18] cxl/mem: Read Dynamic capacity configuration from the device ira.weiny
2023-08-29 14:37 ` Jonathan Cameron
2023-09-03 23:36 ` Ira Weiny
2023-08-30 21:01 ` Dave Jiang
2023-09-05 0:14 ` Ira Weiny
2023-09-08 20:23 ` Ira Weiny
2023-08-30 21:44 ` Fan Ni
2023-09-08 22:52 ` Ira Weiny
2023-09-12 21:32 ` Fan Ni
2023-09-07 15:46 ` Alison Schofield
2023-09-12 1:18 ` Ira Weiny
2023-09-08 12:46 ` Jørgen Hansen
2023-09-11 20:26 ` Ira Weiny
2023-08-29 5:20 ` [PATCH RFC v2 04/18] cxl/region: Add Dynamic Capacity decoder and region modes Ira Weiny
2023-08-29 14:39 ` Jonathan Cameron
2023-08-30 21:13 ` Dave Jiang
2023-08-31 17:00 ` Fan Ni
2023-08-29 5:20 ` [PATCH RFC v2 05/18] cxl/port: Add Dynamic Capacity mode support to endpoint decoders Ira Weiny
2023-08-29 14:49 ` Jonathan Cameron
2023-09-05 0:05 ` Ira Weiny
2023-08-31 17:25 ` Fan Ni
2023-09-08 23:26 ` Ira Weiny
2023-08-29 5:20 ` [PATCH RFC v2 06/18] cxl/port: Add Dynamic Capacity size " Ira Weiny
2023-08-29 15:09 ` Jonathan Cameron
2023-09-05 4:32 ` Ira Weiny
2023-08-29 5:20 ` [PATCH RFC v2 07/18] cxl/mem: Expose device dynamic capacity configuration ira.weiny
2023-08-29 15:14 ` Jonathan Cameron
2023-09-05 17:55 ` Fan Ni
2023-09-05 20:45 ` Ira Weiny
2023-08-30 22:46 ` Dave Jiang
2023-09-08 23:22 ` Ira Weiny
2023-08-29 5:20 ` [PATCH RFC v2 08/18] cxl/region: Add Dynamic Capacity CXL region support Ira Weiny
2023-08-29 15:19 ` Jonathan Cameron [this message]
2023-08-30 23:27 ` Dave Jiang
2023-09-06 4:36 ` Ira Weiny
2023-09-05 21:09 ` Fan Ni
2023-08-29 5:21 ` [PATCH RFC v2 09/18] cxl/mem: Read extents on memory device discovery Ira Weiny
2023-08-29 15:26 ` Jonathan Cameron
2023-08-30 0:16 ` Ira Weiny
2023-09-05 21:41 ` Ira Weiny
2023-08-29 5:21 ` [PATCH RFC v2 10/18] cxl/mem: Handle DCD add and release capacity events Ira Weiny
2023-08-29 15:59 ` Jonathan Cameron
2023-09-05 23:49 ` Ira Weiny
2023-08-31 17:28 ` Dave Jiang
2023-09-08 15:35 ` Ira Weiny
2023-08-29 5:21 ` [PATCH RFC v2 11/18] cxl/region: Expose DC extents on region driver load Ira Weiny
2023-08-29 16:20 ` Jonathan Cameron
2023-09-06 3:36 ` Ira Weiny
2023-08-31 18:38 ` Dave Jiang
2023-09-08 23:57 ` Ira Weiny
2023-08-29 5:21 ` [PATCH RFC v2 12/18] cxl/region: Notify regions of DC changes Ira Weiny
2023-08-29 16:40 ` Jonathan Cameron
2023-09-06 4:00 ` Ira Weiny
2023-09-18 13:56 ` Jørgen Hansen
2023-09-18 17:45 ` Ira Weiny
2023-08-29 5:21 ` [PATCH RFC v2 13/18] dax/bus: Factor out dev dax resize logic Ira Weiny
2023-08-30 11:27 ` Jonathan Cameron
2023-09-06 4:12 ` Ira Weiny
2023-08-31 21:48 ` Dave Jiang
2023-08-29 5:21 ` [PATCH RFC v2 14/18] dax/region: Support DAX device creation on dynamic DAX regions Ira Weiny
2023-08-30 11:50 ` Jonathan Cameron
2023-09-06 4:35 ` Ira Weiny
2023-09-12 16:49 ` Jonathan Cameron
2023-09-12 22:08 ` Ira Weiny
2023-09-12 22:35 ` Dan Williams
2023-09-13 17:30 ` Ira Weiny
2023-09-13 17:59 ` Dan Williams
2023-09-13 19:26 ` Ira Weiny
2023-09-14 10:32 ` Jonathan Cameron
2023-08-29 5:21 ` [PATCH RFC v2 15/18] cxl/mem: Trace Dynamic capacity Event Record ira.weiny
2023-08-29 16:46 ` Jonathan Cameron
2023-09-06 4:07 ` Ira Weiny
2023-08-29 5:21 ` [PATCH RFC v2 16/18] tools/testing/cxl: Make event logs dynamic Ira Weiny
2023-08-30 12:11 ` Jonathan Cameron
2023-09-06 21:15 ` Ira Weiny
2023-08-29 5:21 ` [PATCH RFC v2 17/18] tools/testing/cxl: Add DC Regions to mock mem data Ira Weiny
2023-08-30 12:20 ` Jonathan Cameron
2023-09-06 21:18 ` Ira Weiny
2023-08-31 23:19 ` Dave Jiang
2023-08-29 5:21 ` [PATCH RFC v2 18/18] tools/testing/cxl: Add Dynamic Capacity events Ira Weiny
2023-08-30 12:23 ` Jonathan Cameron
2023-09-06 21:39 ` Ira Weiny
2023-08-31 23:20 ` Dave Jiang
2023-09-07 21:01 ` [PATCH RFC v2 00/18] DCD: Add support for Dynamic Capacity Devices (DCD) Fan Ni
2023-09-12 1:44 ` Ira Weiny
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