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Wed, 12 Nov 2025 17:47:26 -0800 (PST) From: Samuel Holland To: Palmer Dabbelt , Paul Walmsley , linux-riscv@lists.infradead.org, Andrew Morton , David Hildenbrand , linux-mm@kvack.org Cc: devicetree@vger.kernel.org, Suren Baghdasaryan , linux-kernel@vger.kernel.org, Mike Rapoport , Michal Hocko , Conor Dooley , Lorenzo Stoakes , Krzysztof Kozlowski , Alexandre Ghiti , Emil Renner Berthing , Rob Herring , Vlastimil Babka , "Liam R . Howlett" , Samuel Holland Subject: [PATCH v3 18/22] riscv: Fix logic for selecting DMA_DIRECT_REMAP Date: Wed, 12 Nov 2025 17:45:31 -0800 Message-ID: <20251113014656.2605447-19-samuel.holland@sifive.com> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20251113014656.2605447-1-samuel.holland@sifive.com> References: <20251113014656.2605447-1-samuel.holland@sifive.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 79A8B8000B X-Stat-Signature: b7z3jsbuhqwaptxbpb3euguq47t8h4u3 X-Rspam-User: X-HE-Tag: 1762998447-559480 X-HE-Meta: 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 qjK+YUZn 3tKLL12guROlJpghbQPJ6Nzvio+EiZ8DqdV40vAfdQZXOV061eEihhy4hihHgYpHEzSilUdCBQqcMsnunZTeV+NsHOKKt3qF/NogHfErVd8K8G+qRVQaZQ1i9AypuRF0Z8tfeBeSS0ZT6QmmcIehjFxSZn9VyxzTWQSLjZF2/vPi9btXpJck/RmIwoK2aE5k8gv4lF5kmGWPoAjsl3q7PQzFeSNVPW7+UzMVYbp9Piakz8tutga6w1Hee6y5yLH20hzcVfJuL7hlldtz5MF3yHTe0J7AX1nizQrH+rPDrkTHG4XGXUB04gPkkBoJv2CIAvlJ5qbrF0WuTcMweqqpDKUlg6KmEK+B05sXZWAE3sRV7/+UDk/y8o1Gu6PSRcyH8BMCRVCdHOoVbAsXqMmRyZoW0n2AVCjU0p8edf0zomi5N52amr4ur07IhqhaV+i5lpkZ7 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: DMA_DIRECT_REMAP allows the kernel to make pages coherent for DMA by remapping them in the page tables with a different pgprot_t value. On RISC-V, this is supported by the page-based memory type extensions (Svpbmt and Xtheadmae). It is independent from the software cache maintenance extensions (Zicbom and Xtheadcmo). Signed-off-by: Samuel Holland --- Changes in v3: - New patch for v3 arch/riscv/Kconfig | 2 +- arch/riscv/Kconfig.errata | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index fadec20b87a8..cf5a4b5cdcd4 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -598,6 +598,7 @@ config RISCV_ISA_SVPBMT depends on 64BIT && MMU depends on RISCV_ALTERNATIVE default y + select DMA_DIRECT_REMAP help Add support for the Svpbmt ISA-extension (Supervisor-mode: page-based memory types) in the kernel when it is detected at boot. @@ -811,7 +812,6 @@ config RISCV_ISA_ZICBOM depends on RISCV_ALTERNATIVE default y select RISCV_DMA_NONCOHERENT - select DMA_DIRECT_REMAP help Add support for the Zicbom extension (Cache Block Management Operations) and enable its use in the kernel when it is detected diff --git a/arch/riscv/Kconfig.errata b/arch/riscv/Kconfig.errata index aca9b0cfcfec..46a353a266e5 100644 --- a/arch/riscv/Kconfig.errata +++ b/arch/riscv/Kconfig.errata @@ -108,6 +108,7 @@ config ERRATA_THEAD config ERRATA_THEAD_MAE bool "Apply T-Head's memory attribute extension (XTheadMae) errata" depends on ERRATA_THEAD && 64BIT && MMU + select DMA_DIRECT_REMAP select RISCV_ALTERNATIVE_EARLY default y help @@ -119,7 +120,6 @@ config ERRATA_THEAD_MAE config ERRATA_THEAD_CMO bool "Apply T-Head cache management errata" depends on ERRATA_THEAD && MMU - select DMA_DIRECT_REMAP select RISCV_DMA_NONCOHERENT select RISCV_NONSTANDARD_CACHE_OPS default y -- 2.47.2