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Mon, 12 Feb 2024 19:37:49 -0800 (PST) From: Samuel Holland To: Palmer Dabbelt Cc: Andrew Jones , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Stefan O'Rear , Samuel Holland , stable@vger.kernel.org Subject: [PATCH -fixes v2 4/4] riscv: Save/restore envcfg CSR during CPU suspend Date: Mon, 12 Feb 2024 19:37:35 -0800 Message-ID: <20240213033744.4069020-5-samuel.holland@sifive.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240213033744.4069020-1-samuel.holland@sifive.com> References: <20240213033744.4069020-1-samuel.holland@sifive.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The value of the [ms]envcfg CSR is lost when entering a nonretentive idle state, so the CSR must be rewritten when resuming the CPU. Cc: # v6.7+ Fixes: 43c16d51a19b ("RISC-V: Enable cbo.zero in usermode") Signed-off-by: Samuel Holland --- Changes in v2: - Check for privileged ISA v1.12 instead of the specific CSR - Use riscv_has_extension_likely() instead of new ALTERNATIVE()s arch/riscv/include/asm/suspend.h | 1 + arch/riscv/kernel/suspend.c | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/arch/riscv/include/asm/suspend.h b/arch/riscv/include/asm/susp= end.h index 02f87867389a..491296a335d0 100644 --- a/arch/riscv/include/asm/suspend.h +++ b/arch/riscv/include/asm/suspend.h @@ -14,6 +14,7 @@ struct suspend_context { struct pt_regs regs; /* Saved and restored by high-level functions */ unsigned long scratch; + unsigned long envcfg; unsigned long tvec; unsigned long ie; #ifdef CONFIG_MMU diff --git a/arch/riscv/kernel/suspend.c b/arch/riscv/kernel/suspend.c index 239509367e42..be03615486ed 100644 --- a/arch/riscv/kernel/suspend.c +++ b/arch/riscv/kernel/suspend.c @@ -15,6 +15,8 @@ void suspend_save_csrs(struct suspend_context *context) { context->scratch =3D csr_read(CSR_SCRATCH); + if (riscv_has_extension_likely(RISCV_ISA_EXT_Sx1p12)) + context->envcfg =3D csr_read(CSR_ENVCFG); context->tvec =3D csr_read(CSR_TVEC); context->ie =3D csr_read(CSR_IE); =20 @@ -36,6 +38,8 @@ void suspend_save_csrs(struct suspend_context *context) void suspend_restore_csrs(struct suspend_context *context) { csr_write(CSR_SCRATCH, context->scratch); + if (riscv_has_extension_likely(RISCV_ISA_EXT_Sx1p12)) + csr_write(CSR_ENVCFG, context->envcfg); csr_write(CSR_TVEC, context->tvec); csr_write(CSR_IE, context->ie); =20 --=20 2.43.0