From: Dan Williams <dan.j.williams@intel.com>
To: Dave Jiang <dave.jiang@intel.com>, <linux-cxl@vger.kernel.org>
Cc: <dan.j.williams@intel.com>, <ira.weiny@intel.com>,
<vishal.l.verma@intel.com>, <alison.schofield@intel.com>,
<Jonathan.Cameron@huawei.com>, <dave@stgolabs.net>
Subject: RE: [PATCH v7 5/5] cxl: Add checks to access_coordinate calculation to fail missing data
Date: Fri, 5 Apr 2024 15:36:09 -0700 [thread overview]
Message-ID: <66107cd99f69e_2583ad2947d@dwillia2-xfh.jf.intel.com.notmuch> (raw)
In-Reply-To: <20240403154844.3403859-6-dave.jiang@intel.com>
Dave Jiang wrote:
> Jonathan noted that when the coordinates for host bridge and switches
> can be 0s if no actual data are retrieved and the calculation continues.
> The resulting number would be inaccurate. Add checks to ensure that the
> calculation would complete only if the numbers are valid.
>
> While not seen in the wild, issue may show up with a BIOS that reported
> CXL root ports via Generic Ports (via a PCI handle in the SRAT entry).
>
> Fixes: 14a6960b3e92 ("cxl: Add helper function that calculate performance data for downstream ports")
> Reported-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
> Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Looks good,
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
prev parent reply other threads:[~2024-04-05 22:36 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-03 15:47 [PATCH v7 0/5] cxl: access_coordinate validity fixes for 6.9 Dave Jiang
2024-04-03 15:47 ` [PATCH v7 1/5] cxl: Remove checking of iter in cxl_endpoint_get_perf_coordinates() Dave Jiang
2024-04-26 19:10 ` Robert Richter
2024-04-26 20:13 ` Dave Jiang
2024-04-03 15:47 ` [PATCH v7 2/5] cxl: Fix retrieving of access_coordinates in PCIe path Dave Jiang
2024-04-05 13:32 ` Jonathan Cameron
2024-04-05 22:24 ` Dan Williams
2024-04-03 15:47 ` [PATCH v7 3/5] cxl: Fix incorrect region perf data calculation Dave Jiang
2024-04-05 13:48 ` Jonathan Cameron
2024-04-05 22:34 ` Dan Williams
2024-04-08 9:54 ` Jonathan Cameron
2024-04-03 15:47 ` [PATCH v7 4/5] cxl: Consolidate dport access_coordinate ->hb_coord and ->sw_coord into ->coord Dave Jiang
2024-04-03 15:47 ` [PATCH v7 5/5] cxl: Add checks to access_coordinate calculation to fail missing data Dave Jiang
2024-04-05 22:36 ` Dan Williams [this message]
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