[RESEND,0/2] riscv: iommu: Add shutdown callback for kexec

Message

Xu Lu Jan. 3, 2025, 9:32 a.m. UTC

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 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(-)

Comments

Joerg Roedel Jan. 6, 2025, 11:39 a.m. UTC | #1

On Fri, Jan 03, 2025 at 05:32:18PM +0800, Xu Lu wrote:
> 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 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(-)

Applied, thanks.