From: Kiryl Shutsemau <kas@kernel.org>
To: Nicolin Chen <nicolinc@nvidia.com>
Cc: will@kernel.org, robin.murphy@arm.com, jgg@nvidia.com,
joro@8bytes.org, praan@google.com, kevin.tian@intel.com,
smostafa@google.com, linux-arm-kernel@lists.infradead.org,
iommu@lists.linux.dev, linux-kernel@vger.kernel.org,
jamien@nvidia.com
Subject: Re: [PATCH v10 03/13] iommu/arm-smmu-v3: Add ARM_SMMU_FEAT_EVTQ for the event queue
Date: Wed, 2 Sep 2026 12:21:36 +0100 [thread overview]
Message-ID: <apgGoQYMoNSAXEP0@thinkstation> (raw)
In-Reply-To: <b6493aeece86f44195e8afb6fb8b3497cc237dc2.1788130528.git.nicolinc@nvidia.com>
On Sun, Aug 30, 2026 at 04:18:04PM -0700, Nicolin Chen wrote:
> The driver programs and enables the event queue unconditionally, while the
> PRI queue has an ARM_SMMU_FEAT_PRI gating each of its touch points. Yet a
> kdump kernel wants to leave both of the queues alone, which would take an
> is_kdump_kernel() test at every one of those places.
>
> Add an ARM_SMMU_FEAT_EVTQ that the probe always sets, as the event queue is
> architecturally mandatory, and gate the queue's allocation, its interrupt
> and its CR0 and IRQ_CTRL enables on it, so that a later change can turn the
> queue off in a single place.
>
> No functional change intended.
>
> Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
> Suggested-by: Robin Murphy <robin.murphy@arm.com>
> Assisted-by: Claude:claude-opus-5
> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Acked-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
--
Kiryl Shutsemau / Kirill A. Shutemov
next prev parent reply other threads:[~2026-09-02 11:21 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-30 23:18 [PATCH v10 00/13] iommu/arm-smmu-v3: Adopt the crashed kernel's stream table for kdump Nicolin Chen
2026-08-30 23:18 ` [PATCH v10 01/13] iommu/arm-smmu-v3: Init the vmid_map ida before the stream table setup Nicolin Chen
2026-08-30 23:18 ` [PATCH v10 02/13] iommu/arm-smmu-v3: Make the ASID space per SMMU instance Nicolin Chen
2026-08-30 23:18 ` [PATCH v10 03/13] iommu/arm-smmu-v3: Add ARM_SMMU_FEAT_EVTQ for the event queue Nicolin Chen
2026-09-02 11:21 ` Kiryl Shutsemau [this message]
2026-08-30 23:18 ` [PATCH v10 04/13] iommu/arm-smmu-v3: Disable the EVTQ and the PRIQ in a kdump kernel Nicolin Chen
2026-09-02 11:22 ` Kiryl Shutsemau
2026-08-30 23:18 ` [PATCH v10 05/13] iommu/arm-smmu-v3: Add strtab parse helpers to a new arm-smmu-v3-kexec.c Nicolin Chen
2026-08-30 23:18 ` [PATCH v10 06/13] iommu/arm-smmu-v3: Add ARM_SMMU_OPT_KDUMP_ADOPT for kdump kernel Nicolin Chen
2026-08-30 23:18 ` [PATCH v10 07/13] iommu/arm-smmu-v3-kexec: Add a CD table parse helper Nicolin Chen
2026-08-30 23:18 ` [PATCH v10 08/13] iommu/arm-smmu-v3-kexec: Add ASID/VMID reservation helpers Nicolin Chen
2026-08-30 23:18 ` [PATCH v10 09/13] iommu/arm-smmu-v3-kdump: Reserve crashed kernel's ASIDs and VMIDs Nicolin Chen
2026-08-30 23:18 ` [PATCH v10 10/13] iommu/arm-smmu-v3-kdump: Implement is_attach_deferred() Nicolin Chen
2026-08-30 23:18 ` [PATCH v10 11/13] iommu/arm-smmu-v3: Retain CR0_SMMUEN during kdump device reset Nicolin Chen
2026-08-30 23:18 ` [PATCH v10 12/13] iommu/arm-smmu-v3: Skip RMR bypass for kdump adoption Nicolin Chen
2026-08-30 23:18 ` [PATCH v10 13/13] iommu/arm-smmu-v3: Detect ARM_SMMU_OPT_KDUMP_ADOPT in probe() Nicolin Chen
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