From: Jonathan Cameron <jonathan.cameron@huawei.com>
To: Alison Schofield <alison.schofield@intel.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>,
Dave Jiang <dave.jiang@intel.com>,
Vishal Verma <vishal.l.verma@intel.com>,
Ira Weiny <ira.weiny@intel.com>,
Dan Williams <dan.j.williams@intel.com>,
<linux-cxl@vger.kernel.org>
Subject: Re: [PATCH v4 2/2] cxl/region: Translate HPA to DPA and memdev in unaligned regions
Date: Thu, 15 Jan 2026 17:30:00 +0000 [thread overview]
Message-ID: <20260115173000.00006110@huawei.com> (raw)
In-Reply-To: <0d7d47672e81d0c4d9a4e5e335ca536dbecb9dee.1768008522.git.alison.schofield@intel.com>
On Fri, 9 Jan 2026 17:54:14 -0800
Alison Schofield <alison.schofield@intel.com> wrote:
> The CXL driver supports an expert user debugfs interface to inject and
> clear poison by a region offset. That feature requires translating a
> HPA (the region address) to a DPA and a memdev to perform the poison
> operation.
>
> Unaligned regions do not have an algebraically invertible mapping
> from HPA to DPA due to the region offset skew. The region base is not
> aligned to a full interleave. Add a helper to perform the unaligned
> translations that first calculates the DPA offset and then tests it
> against each candidate endpoint decoder.
>
> Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
prev parent reply other threads:[~2026-01-15 17:30 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-10 1:54 [PATCH v4 0/2] cxl/region: Support unaligned address translations Alison Schofield
2026-01-10 1:54 ` [PATCH v4 1/2] cxl/region: Translate DPA->HPA in unaligned MOD3 regions Alison Schofield
2026-01-14 0:24 ` Dave Jiang
2026-01-10 1:54 ` [PATCH v4 2/2] cxl/region: Translate HPA to DPA and memdev in unaligned regions Alison Schofield
2026-01-14 0:24 ` Dave Jiang
2026-01-15 17:30 ` Jonathan Cameron [this message]
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