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(unknown [210.73.43.101]) by APP-03 (Coremail) with SMTP id rQCowABnsXvsLMpojtxAAw--.607S6; Wed, 17 Sep 2025 11:37:30 +0800 (CST) From: Chunyan Zhang To: linux-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Conor Dooley , Deepak Gupta , Ved Shanbhogue , Alexander Viro , Christian Brauner , Jan Kara , Andrew Morton , Peter Xu , Arnd Bergmann , David Hildenbrand , Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Axel Rasmussen , Yuanchu Xie , Chunyan Zhang Subject: [PATCH V13 4/6] riscv: mm: Add soft-dirty page tracking support Date: Wed, 17 Sep 2025 11:37:01 +0800 Message-Id: <20250917033703.1695933-5-zhangchunyan@iscas.ac.cn> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250917033703.1695933-1-zhangchunyan@iscas.ac.cn> References: <20250917033703.1695933-1-zhangchunyan@iscas.ac.cn> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:rQCowABnsXvsLMpojtxAAw--.607S6 X-Coremail-Antispam: 1UD129KBjvJXoW3Jw15XrWrCrW8WF1xWF4kWFg_yoW7XF1kpF Z5GFyrZ39YyFn3KayftrsIgrWYvws3Way5Wry3Ca1kJFWUG3yUXF90grW3Ar98JFWkZayf urZ3tr45C3y7Jr7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUQjb7Iv0xC_Zr1lb4IE77IF4wAFF20E14v26rWj6s0DM7CY07I2 0VC2zVCF04k26cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI 8067AKxVWUAVCq3wA2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAvFVAK0II2c7xJM28C jxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVW8JVW5JwA2z4x0Y4vE2Ix0cI 8IcVCY1x0267AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_Cr1j6rxdM28EF7xvwVC2 z280aVCY1x0267AKxVW0oVCq3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0V AKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUGVWUXwAv7VC2z280aVAFwI0_Jr0_Gr1l Ox8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JM4IIrI8v6xkF7I0E8cxan2IY04 v7MxkF7I0En4kS14v26r4a6rW5MxkIecxEwVAFwVW8GwCF04k20xvY0x0EwIxGrwCFx2Iq xVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r 106r1rMI8E67AF67kF1VAFwI0_GFv_WrylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AK xVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F4UJwCI42IY6xAIw20EY4v20x vaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVW8 Jr0_Cr1UYxBIdaVFxhVjvjDU0xZFpf9x07j9Z2-UUUUU= X-Originating-IP: [210.73.43.101] X-CM-SenderInfo: x2kd0wxfkx051dq6x2xfdvhtffof0/1tbiDAUIB2jJ8PfwbwAAs- X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: EFC3F10000F X-Stat-Signature: jzgyh38fase6jukhk8xbbaxatma8wxzk X-Rspam-User: X-HE-Tag: 1758080262-705743 X-HE-Meta: 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 VP7o/vjJ ku1nsgXMszGhjfNLnR4fsWNZmim0fR1ygl7F6BtdZ6SU37v8QUaakQIBMG2IIX6j2ScfHMFjiWKIDWdyEQbCqFF7gL3yp74LO3qYHXnpekS/6M+EjBpJ8vrUp8A3SOCM/OLcJyu3oKJUplDtCjEGMviPCx8YINB+BzFHpZ17KO2DZWzmGct+G3VrgqVugyzRz0Y3C4MZuhZrbR7CKoyNhmpKytKlr1wLKwI/WguFumBV2ps4QpLRW+MtIzntsALaKMYMf0B64QxRJRYByEfOd+Y2xjh/CmuJ7ivu2ABjJLWO7K8Z5vy9LW96XHqC3zhA0pmvFvmival04Vhw= 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: The Svrsw60t59b extension allows to free the PTE reserved bits 60 and 59 for software, this patch uses bit 59 for soft-dirty. To add swap PTE soft-dirty tracking, we borrow bit 3 which is available for swap PTEs on RISC-V systems. Reviewed-by: Deepak Gupta Signed-off-by: Chunyan Zhang --- arch/riscv/Kconfig | 1 + arch/riscv/include/asm/pgtable-bits.h | 19 +++++++ arch/riscv/include/asm/pgtable.h | 75 ++++++++++++++++++++++++++- 3 files changed, 93 insertions(+), 2 deletions(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index d99df67cc7a4..53b73e4bdf3f 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -141,6 +141,7 @@ config RISCV select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET select HAVE_ARCH_SECCOMP_FILTER + select HAVE_ARCH_SOFT_DIRTY if 64BIT && MMU && RISCV_ISA_SVRSW60T59B select HAVE_ARCH_THREAD_STRUCT_WHITELIST select HAVE_ARCH_TRACEHOOK select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU diff --git a/arch/riscv/include/asm/pgtable-bits.h b/arch/riscv/include/asm/pgtable-bits.h index 179bd4afece4..f3bac2bbc157 100644 --- a/arch/riscv/include/asm/pgtable-bits.h +++ b/arch/riscv/include/asm/pgtable-bits.h @@ -19,6 +19,25 @@ #define _PAGE_SOFT (3 << 8) /* Reserved for software */ #define _PAGE_SPECIAL (1 << 8) /* RSW: 0x1 */ + +#ifdef CONFIG_MEM_SOFT_DIRTY + +/* ext_svrsw60t59b: bit 59 for soft-dirty tracking */ +#define _PAGE_SOFT_DIRTY \ + ((riscv_has_extension_unlikely(RISCV_ISA_EXT_SVRSW60T59B)) ? \ + (1UL << 59) : 0) +/* + * Bit 3 is always zero for swap entry computation, so we + * can borrow it for swap page soft-dirty tracking. + */ +#define _PAGE_SWP_SOFT_DIRTY \ + ((riscv_has_extension_unlikely(RISCV_ISA_EXT_SVRSW60T59B)) ? \ + _PAGE_EXEC : 0) +#else +#define _PAGE_SOFT_DIRTY 0 +#define _PAGE_SWP_SOFT_DIRTY 0 +#endif /* CONFIG_MEM_SOFT_DIRTY */ + #define _PAGE_TABLE _PAGE_PRESENT /* diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index e69346307e78..d7fe0f78107b 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -427,7 +427,7 @@ static inline pte_t pte_mkwrite_novma(pte_t pte) static inline pte_t pte_mkdirty(pte_t pte) { - return __pte(pte_val(pte) | _PAGE_DIRTY); + return __pte(pte_val(pte) | _PAGE_DIRTY | _PAGE_SOFT_DIRTY); } static inline pte_t pte_mkclean(pte_t pte) @@ -455,6 +455,42 @@ static inline pte_t pte_mkhuge(pte_t pte) return pte; } +#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY +#define pgtable_supports_soft_dirty() \ + (IS_ENABLED(CONFIG_MEM_SOFT_DIRTY) && \ + riscv_has_extension_unlikely(RISCV_ISA_EXT_SVRSW60T59B)) + +static inline bool pte_soft_dirty(pte_t pte) +{ + return !!(pte_val(pte) & _PAGE_SOFT_DIRTY); +} + +static inline pte_t pte_mksoft_dirty(pte_t pte) +{ + return __pte(pte_val(pte) | _PAGE_SOFT_DIRTY); +} + +static inline pte_t pte_clear_soft_dirty(pte_t pte) +{ + return __pte(pte_val(pte) & ~(_PAGE_SOFT_DIRTY)); +} + +static inline bool pte_swp_soft_dirty(pte_t pte) +{ + return !!(pte_val(pte) & _PAGE_SWP_SOFT_DIRTY); +} + +static inline pte_t pte_swp_mksoft_dirty(pte_t pte) +{ + return __pte(pte_val(pte) | _PAGE_SWP_SOFT_DIRTY); +} + +static inline pte_t pte_swp_clear_soft_dirty(pte_t pte) +{ + return __pte(pte_val(pte) & ~(_PAGE_SWP_SOFT_DIRTY)); +} +#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ + #ifdef CONFIG_RISCV_ISA_SVNAPOT #define pte_leaf_size(pte) (pte_napot(pte) ? \ napot_cont_size(napot_cont_order(pte)) :\ @@ -802,6 +838,40 @@ static inline pud_t pud_mkspecial(pud_t pud) } #endif +#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY +static inline bool pmd_soft_dirty(pmd_t pmd) +{ + return pte_soft_dirty(pmd_pte(pmd)); +} + +static inline pmd_t pmd_mksoft_dirty(pmd_t pmd) +{ + return pte_pmd(pte_mksoft_dirty(pmd_pte(pmd))); +} + +static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd) +{ + return pte_pmd(pte_clear_soft_dirty(pmd_pte(pmd))); +} + +#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION +static inline bool pmd_swp_soft_dirty(pmd_t pmd) +{ + return pte_swp_soft_dirty(pmd_pte(pmd)); +} + +static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd) +{ + return pte_pmd(pte_swp_mksoft_dirty(pmd_pte(pmd))); +} + +static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd) +{ + return pte_pmd(pte_swp_clear_soft_dirty(pmd_pte(pmd))); +} +#endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */ +#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ + static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd) { @@ -994,7 +1064,8 @@ static inline pud_t pud_modify(pud_t pud, pgprot_t newprot) * * Format of swap PTE: * bit 0: _PAGE_PRESENT (zero) - * bit 1 to 3: _PAGE_LEAF (zero) + * bit 1 to 2: (zero) + * bit 3: _PAGE_SWP_SOFT_DIRTY * bit 5: _PAGE_PROT_NONE (zero) * bit 6: exclusive marker * bits 7 to 11: swap type -- 2.34.1