From: sashiko-bot@kernel.org
To: "Srirangan Madhavan" <smadhavan@nvidia.com>, linux-pci@vger.kernel.org
Subject: Re: [PATCH v16 17/18] PCI/CXL: Restore CXL state after CXL bus reset
Date: Thu, 29 Oct 2026 15:22:45 +0000 [thread overview]
Message-ID: <sashiko-outbox-189596@kernel.org> (raw)
In-Reply-To: <20261029145703.2185231-18-smadhavan@nvidia.com>
> CXL bus reset can clear HDM decoder programming and CXL Device DVSEC
> control state. Restore the cached state after a successful cxl_bus reset
> while IOMMU exclusion remains active.
>
> Restore PCI configuration first so HDM MMIO is accessible, and preserve a
> disabled state if restoration fails.
>
> Copy the cached state before the reset, then refresh its decoder settings
> from the cache under the CXL region quiesce once the reset completes. A
> region decommit during the reset updates the cache, and restoring the
> earlier decoders would leave the endpoint decoding an HPA range that the
> CXL core considers free. Keep global and DVSEC control from before the
> reset, since a refresh during the reset can read them as all-ones.
>
> The prepare/restore interface and decoder-refresh structure follow Dave
> Jiang's cxl-type2-reset reference branch.
>
> Signed-off-by: Srirangan Madhavan <smadhavan@nvidia.com>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261029145703.2185231-1-smadhavan@nvidia.com?part=17
next prev parent reply other threads:[~2026-10-29 15:22 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-29 14:56 [PATCH v16 00/18] PCI/CXL: Add CXL reset support for Type 2 devices Srirangan Madhavan
2026-10-29 14:56 ` [PATCH v16 01/18] cxl: Clarify decoder interleave limit Srirangan Madhavan
2026-10-29 15:00 ` sashiko-bot
2026-10-29 14:56 ` [PATCH v16 02/18] cxl: Share CXL port upstream PCI device lookup Srirangan Madhavan
2026-10-29 15:07 ` sashiko-bot
2026-10-29 14:56 ` [PATCH v16 03/18] cxl: Move decoder declarations to shared header Srirangan Madhavan
2026-10-29 15:03 ` sashiko-bot
2026-10-29 14:56 ` [PATCH v16 04/18] cxl: Embed decoder configuration in a standalone structure Srirangan Madhavan
2026-10-29 15:03 ` sashiko-bot
2026-10-29 14:56 ` [PATCH v16 05/18] cxl: Introduce endpoint HDM decoder settings Srirangan Madhavan
2026-10-29 15:03 ` sashiko-bot
2026-10-29 14:56 ` [PATCH v16 06/18] cxl: Move HDM decoder helpers to built-in code Srirangan Madhavan
2026-10-29 15:03 ` sashiko-bot
2026-10-29 14:56 ` [PATCH v16 07/18] cxl: Share HDM decoder register unpacking Srirangan Madhavan
2026-10-29 15:09 ` sashiko-bot
2026-10-29 14:56 ` [PATCH v16 08/18] cxl: Move cxl_rwsem into built-in code Srirangan Madhavan
2026-10-29 15:04 ` sashiko-bot
2026-10-29 14:56 ` [PATCH v16 09/18] cxl: Refresh cached PCI HDM decoder settings Srirangan Madhavan
2026-10-29 15:08 ` sashiko-bot
2026-10-29 14:56 ` [PATCH v16 10/18] cxl: Build register block helpers into the kernel Srirangan Madhavan
2026-10-29 15:07 ` sashiko-bot
2026-10-29 14:56 ` [PATCH v16 11/18] PCI/CXL: Cache endpoint HDM state during PCI enumeration Srirangan Madhavan
2026-10-29 15:29 ` sashiko-bot
2026-10-29 14:56 ` [PATCH v16 12/18] PCI/CXL: Add CXL Device Reset sequencing Srirangan Madhavan
2026-10-29 15:05 ` sashiko-bot
2026-10-29 14:56 ` [PATCH v16 13/18] cxl: Validate and synchronize HDM ranges around reset Srirangan Madhavan
2026-10-29 15:25 ` sashiko-bot
2026-10-29 14:56 ` [PATCH v16 14/18] PCI/CXL: Reject reset with unsafe function scope Srirangan Madhavan
2026-10-29 15:10 ` sashiko-bot
2026-10-29 14:57 ` [PATCH v16 15/18] PCI/CXL: Restore CXL state after PCI reset Srirangan Madhavan
2026-10-29 15:29 ` sashiko-bot
2026-10-29 14:57 ` [PATCH v16 16/18] PCI/CXL: Expose CXL Reset as a PCI reset method Srirangan Madhavan
2026-10-29 15:12 ` sashiko-bot
2026-10-29 14:57 ` [PATCH v16 17/18] PCI/CXL: Restore CXL state after CXL bus reset Srirangan Madhavan
2026-10-29 15:22 ` sashiko-bot [this message]
2026-10-29 14:57 ` [PATCH v16 18/18] cxl: Add KUnit checks for HDM decoder unpacking Srirangan Madhavan
2026-10-29 15:09 ` sashiko-bot
2026-10-29 18:58 ` [PATCH v16 00/18] PCI/CXL: Add CXL reset support for Type 2 devices Alison Schofield
2026-10-29 23:03 ` Srirangan Madhavan
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