linux-kernel - [PATCH] iommu: PGTABLE

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Date:   Wed, 29 Mar 2023 23:01:05 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>, iommu@...ts.linux.dev,
        Conor Dooley <conor@...nel.org>,
        linux-riscv@...ts.infradead.org
Subject: [PATCH] iommu: PGTABLE_LPAE is also for RISCV

On riscv64, linux-next-20233030 (and for several days earlier),
there is a kconfig warning:

WARNING: unmet direct dependencies detected for IOMMU_IO_PGTABLE_LPAE
  Depends on [n]: IOMMU_SUPPORT [=y] && (ARM || ARM64 || COMPILE_TEST [=n]) && !GENERIC_ATOMIC64 [=n]
  Selected by [y]:
  - IPMMU_VMSA [=y] && IOMMU_SUPPORT [=y] && (ARCH_RENESAS [=y] || COMPILE_TEST [=n]) && !GENERIC_ATOMIC64 [=n]

and build errors:

riscv64-linux-ld: drivers/iommu/io-pgtable-arm.o: in function `.L140':
io-pgtable-arm.c:(.init.text+0x1e8): undefined reference to `alloc_io_pgtable_ops'
riscv64-linux-ld: drivers/iommu/io-pgtable-arm.o: in function `.L168':
io-pgtable-arm.c:(.init.text+0xab0): undefined reference to `free_io_pgtable_ops'
riscv64-linux-ld: drivers/iommu/ipmmu-vmsa.o: in function `.L140':
ipmmu-vmsa.c:(.text+0xbc4): undefined reference to `free_io_pgtable_ops'
riscv64-linux-ld: drivers/iommu/ipmmu-vmsa.o: in function `.L0 ':
ipmmu-vmsa.c:(.text+0x145e): undefined reference to `alloc_io_pgtable_ops'

Add RISCV as an allowed ARCH dependency to fix these problems.

Fixes: d286a58bc8f4 ("iommu: Tidy up io-pgtable dependencies")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Will Deacon <will@...nel.org>
Cc: Robin Murphy <robin.murphy@....com>
Cc: iommu@...ts.linux.dev
Cc: Conor Dooley <conor@...nel.org>
Cc: linux-riscv@...ts.infradead.org
---
 drivers/iommu/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -- a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -32,7 +32,7 @@ config IOMMU_IO_PGTABLE
 config IOMMU_IO_PGTABLE_LPAE
 	bool "ARMv7/v8 Long Descriptor Format"
 	select IOMMU_IO_PGTABLE
-	depends on ARM || ARM64 || COMPILE_TEST
+	depends on ARM || ARM64 || RISCV || COMPILE_TEST
 	depends on !GENERIC_ATOMIC64	# for cmpxchg64()
 	help
 	  Enable support for the ARM long descriptor pagetable format.