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From: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
To: Dave Jiang <dave.jiang@intel.com>
Cc: <linux-cxl@vger.kernel.org>,
	Dan Williams <dan.j.williams@intel.com>, <ira.weiny@intel.com>,
	<vishal.l.verma@intel.com>, <alison.schofield@intel.com>,
	<dave@stgolabs.net>
Subject: Re: [PATCH v11 21/22] cxl: Export sysfs attributes for memory device QoS class
Date: Mon, 16 Oct 2023 11:59:39 +0100	[thread overview]
Message-ID: <20231016115939.00001184@Huawei.com> (raw)
In-Reply-To: <169713693604.2205276.7697288344292256806.stgit@djiang5-mobl3>

On Thu, 12 Oct 2023 11:55:36 -0700
Dave Jiang <dave.jiang@intel.com> wrote:

> Export qos_class sysfs attributes for the CXL memory device. The QoS clas
> should show up as /sys/bus/cxl/devices/memX/ram/qos_class for the volatile
> partition and /sys/bus/cxl/devices/memX/pmem/qos_class for the persistent
> partition. The QTG ID is retrieved via _DSM after supplying the
> calculated bandwidth and latency for the entire CXL path from device to
> the CPU. This ID is used to match up to the root decoder QoS class to
> determine which CFMWS the memory range of a hotplugged CXL mem device
> should be assigned under.
> 
> While there may be multiple DSMAS exported by the device CDAT, the driver
> will only expose the first QTG ID per partition in sysfs for now. In the
> future when multiple QTG IDs are necessary, they can be exposed. [1]
> 
> [1]: https://lore.kernel.org/linux-cxl/167571650007.587790.10040913293130712882.stgit@djiang5-mobl3.local/T/#md2a47b1ead3e1ba08f50eab29a4af1aed1d215ab
> 
> Suggested-by: Dan Williams <dan.j.williams@intel.com>
> Signed-off-by: Dave Jiang <dave.jiang@intel.com>
> 
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>



  reply	other threads:[~2023-10-16 10:59 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-10-12 18:53 [PATCH v11 00/22] cxl: Add support for QTG ID retrieval for CXL subsystem Dave Jiang
2023-10-12 18:53 ` [PATCH v11 01/22] cxl: Export QTG ids from CFMWS to sysfs as qos_class attribute Dave Jiang
2023-10-12 18:53 ` [PATCH v11 02/22] cxl: Add checksum verification to CDAT from CXL Dave Jiang
2023-10-12 18:53 ` [PATCH v11 03/22] cxl: Add support for reading CXL switch CDAT table Dave Jiang
2023-10-12 18:53 ` [PATCH v11 04/22] acpi: Move common tables helper functions to common lib Dave Jiang
2023-10-12 18:54 ` [PATCH v11 05/22] lib/firmware_table: tables: Add CDAT table parsing support Dave Jiang
2023-10-12 18:54 ` [PATCH v11 06/22] base/node / acpi: Change 'node_hmem_attrs' to 'access_coordinates' Dave Jiang
2023-10-28  4:51   ` Dan Williams
2023-10-12 18:54 ` [PATCH v11 07/22] acpi: numa: Create enum for memory_target access coordinates indexing Dave Jiang
2023-10-12 18:54 ` [PATCH v11 08/22] acpi: numa: Add genport target allocation to the HMAT parsing Dave Jiang
2023-10-12 18:54 ` [PATCH v11 09/22] acpi: Break out nesting for hmat_parse_locality() Dave Jiang
2023-10-12 18:54 ` [PATCH v11 10/22] acpi: numa: Add setting of generic port system locality attributes Dave Jiang
2023-10-12 18:54 ` [PATCH v11 11/22] acpi: numa: Add helper function to retrieve the performance attributes Dave Jiang
2023-10-12 18:54 ` [PATCH v11 12/22] cxl: Add callback to parse the DSMAS subtables from CDAT Dave Jiang
2023-10-28  4:08   ` Dan Williams
2023-10-12 18:54 ` [PATCH v11 13/22] cxl: Add callback to parse the DSLBIS subtable " Dave Jiang
2023-10-12 18:54 ` [PATCH v11 14/22] cxl: Add callback to parse the SSLBIS " Dave Jiang
2023-10-12 18:55 ` [PATCH v11 15/22] cxl: Add support for _DSM Function for retrieving QTG ID Dave Jiang
2023-10-16 10:56   ` Jonathan Cameron
2023-10-12 18:55 ` [PATCH v11 16/22] cxl: Calculate and store PCI link latency for the downstream ports Dave Jiang
2023-10-12 18:55 ` [PATCH v11 17/22] cxl: Store the access coordinates for the generic ports Dave Jiang
2023-10-12 18:55 ` [PATCH v11 18/22] cxl: Add helper function that calculate performance data for downstream ports Dave Jiang
2023-10-12 18:55 ` [PATCH v11 19/22] cxl: Compute the entire CXL path latency and bandwidth data Dave Jiang
2023-10-12 18:55 ` [PATCH v11 20/22] cxl: Store QTG IDs and related info to the CXL memory device context Dave Jiang
2023-10-16 10:58   ` Jonathan Cameron
2023-10-27  4:48   ` Gregory Price
2023-10-27 17:17   ` Gregory Price
2023-10-28  4:23     ` Dan Williams
2023-10-12 18:55 ` [PATCH v11 21/22] cxl: Export sysfs attributes for memory device QoS class Dave Jiang
2023-10-16 10:59   ` Jonathan Cameron [this message]
2023-10-12 18:55 ` [PATCH v11 22/22] cxl: Check qos_class validity on memdev probe Dave Jiang
2023-10-16 11:04   ` Jonathan Cameron
2023-10-28  4:29     ` Dan Williams
2023-10-26 22:54 ` [PATCH v11 00/22] cxl: Add support for QTG ID retrieval for CXL subsystem Gregory Price
2023-10-30 16:18   ` Dave Jiang

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