linux-kernel - [PATCH 0/2] riscv: iommu: Add shutdown callback for kexec

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Message-Id: <20241213114233.12388-1-luxu.kernel@bytedance.com>
Date: Fri, 13 Dec 2024 19:42:31 +0800
From: Xu Lu <luxu.kernel@...edance.com>
To: tjeznach@...osinc.com,
	joro@...tes.org,
	will@...nel.org
Cc: lihangjing@...edance.com,
	xieyongji@...edance.com,
	guojinhui.liam@...edance.com,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Xu Lu <luxu.kernel@...edance.com>
Subject: [PATCH 0/2] riscv: iommu: Add shutdown callback for kexec

After kexec, the newly booted kernel can not initialize iommu driver
successfully as no one resets iommu state before kexec.

This patch series supplies shutdown callback for iommu pmu driver. The
shutdown callback resets necessary registers so that newly booted kernel
can pass riscv_iommu_init_check() after kexec.

Xu Lu (2):
  iommu/riscv: Empty iommu queue before enabling it
  iommu/riscv: Add shutdown function for iommu driver

 drivers/iommu/riscv/iommu-pci.c      |  8 ++++++++
 drivers/iommu/riscv/iommu-platform.c |  6 ++++++
 drivers/iommu/riscv/iommu.c          | 12 ++++++++++--
 drivers/iommu/riscv/iommu.h          |  1 +
 4 files changed, 25 insertions(+), 2 deletions(-)

-- 
2.20.1