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[2003:d8:2f4a:5800:f1ae:8e20:d7f4:51b0]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-442cd32f331sm168479925e9.13.2025.05.12.05.34.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 12 May 2025 05:34:31 -0700 (PDT) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, x86@kernel.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-trace-kernel@vger.kernel.org, David Hildenbrand , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Simona Vetter , Andrew Morton , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , "Liam R. Howlett" , Lorenzo Stoakes , Vlastimil Babka , Jann Horn , Pedro Falcato , Peter Xu , Ingo Molnar Subject: [PATCH v2 02/11] mm: convert track_pfn_insert() to pfnmap_setup_cachemode*() Date: Mon, 12 May 2025 14:34:15 +0200 Message-ID: <20250512123424.637989-3-david@redhat.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250512123424.637989-1-david@redhat.com> References: <20250512123424.637989-1-david@redhat.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: cxqYeynEwN0f1SMHFuLjHMLv27wGehnayUSJ6lNW4I8_1747053272 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true ... by factoring it out from track_pfn_remap() into pfnmap_setup_cachemode() and provide pfnmap_setup_cachemode_pfn() as a replacement for track_pfn_insert(). For PMDs/PUDs, we keep checking a single pfn only. Add some documentation, and also document why it is valid to not check the whole pfn range. We'll reuse pfnmap_setup_cachemode() from core MM next. Acked-by: Ingo Molnar # x86 bits Signed-off-by: David Hildenbrand --- arch/x86/mm/pat/memtype.c | 24 ++++++------------ include/linux/pgtable.h | 52 +++++++++++++++++++++++++++++++++------ mm/huge_memory.c | 5 ++-- mm/memory.c | 4 +-- 4 files changed, 57 insertions(+), 28 deletions(-) diff --git a/arch/x86/mm/pat/memtype.c b/arch/x86/mm/pat/memtype.c index edec5859651d6..fa78facc6f633 100644 --- a/arch/x86/mm/pat/memtype.c +++ b/arch/x86/mm/pat/memtype.c @@ -1031,7 +1031,6 @@ int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, unsigned long pfn, unsigned long addr, unsigned long size) { resource_size_t paddr = (resource_size_t)pfn << PAGE_SHIFT; - enum page_cache_mode pcm; /* reserve the whole chunk starting from paddr */ if (!vma || (addr == vma->vm_start @@ -1044,13 +1043,17 @@ int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, return ret; } + return pfnmap_setup_cachemode(pfn, size, prot); +} + +int pfnmap_setup_cachemode(unsigned long pfn, unsigned long size, pgprot_t *prot) +{ + resource_size_t paddr = (resource_size_t)pfn << PAGE_SHIFT; + enum page_cache_mode pcm; + if (!pat_enabled()) return 0; - /* - * For anything smaller than the vma size we set prot based on the - * lookup. - */ pcm = lookup_memtype(paddr); /* Check memtype for the remaining pages */ @@ -1065,17 +1068,6 @@ int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, return 0; } -void track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot, pfn_t pfn) -{ - enum page_cache_mode pcm; - - if (!pat_enabled()) - return; - - pcm = lookup_memtype(pfn_t_to_phys(pfn)); - pgprot_set_cachemode(prot, pcm); -} - /* * untrack_pfn is called while unmapping a pfnmap for a region. * untrack can be called for a specific region indicated by pfn and size or diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index f1e890b604609..be1745839871c 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -1496,13 +1496,10 @@ static inline int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, return 0; } -/* - * track_pfn_insert is called when a _new_ single pfn is established - * by vmf_insert_pfn(). - */ -static inline void track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot, - pfn_t pfn) +static inline int pfnmap_setup_cachemode(unsigned long pfn, unsigned long size, + pgprot_t *prot) { + return 0; } /* @@ -1552,8 +1549,32 @@ static inline void untrack_pfn_clear(struct vm_area_struct *vma) extern int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, unsigned long pfn, unsigned long addr, unsigned long size); -extern void track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot, - pfn_t pfn); + +/** + * pfnmap_setup_cachemode - setup the cachemode in the pgprot for a pfn range + * @pfn: the start of the pfn range + * @size: the size of the pfn range in bytes + * @prot: the pgprot to modify + * + * Lookup the cachemode for the pfn range starting at @pfn with the size + * @size and store it in @prot, leaving other data in @prot unchanged. + * + * This allows for a hardware implementation to have fine-grained control of + * memory cache behavior at page level granularity. Without a hardware + * implementation, this function does nothing. + * + * Currently there is only one implementation for this - x86 Page Attribute + * Table (PAT). See Documentation/arch/x86/pat.rst for more details. + * + * This function can fail if the pfn range spans pfns that require differing + * cachemodes. If the pfn range was previously verified to have a single + * cachemode, it is sufficient to query only a single pfn. The assumption is + * that this is the case for drivers using the vmf_insert_pfn*() interface. + * + * Returns 0 on success and -EINVAL on error. + */ +int pfnmap_setup_cachemode(unsigned long pfn, unsigned long size, + pgprot_t *prot); extern int track_pfn_copy(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma, unsigned long *pfn); extern void untrack_pfn_copy(struct vm_area_struct *dst_vma, @@ -1563,6 +1584,21 @@ extern void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn, extern void untrack_pfn_clear(struct vm_area_struct *vma); #endif +/** + * pfnmap_setup_cachemode_pfn - setup the cachemode in the pgprot for a pfn + * @pfn: the pfn + * @prot: the pgprot to modify + * + * Lookup the cachemode for @pfn and store it in @prot, leaving other + * data in @prot unchanged. + * + * See pfnmap_setup_cachemode() for details. + */ +static inline void pfnmap_setup_cachemode_pfn(unsigned long pfn, pgprot_t *prot) +{ + pfnmap_setup_cachemode(pfn, PAGE_SIZE, prot); +} + #ifdef CONFIG_MMU #ifdef __HAVE_COLOR_ZERO_PAGE static inline int is_zero_pfn(unsigned long pfn) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 2780a12b25f01..d3e66136e41a3 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1455,7 +1455,8 @@ vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write) return VM_FAULT_OOM; } - track_pfn_insert(vma, &pgprot, pfn); + pfnmap_setup_cachemode_pfn(pfn_t_to_pfn(pfn), &pgprot); + ptl = pmd_lock(vma->vm_mm, vmf->pmd); error = insert_pfn_pmd(vma, addr, vmf->pmd, pfn, pgprot, write, pgtable); @@ -1577,7 +1578,7 @@ vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write) if (addr < vma->vm_start || addr >= vma->vm_end) return VM_FAULT_SIGBUS; - track_pfn_insert(vma, &pgprot, pfn); + pfnmap_setup_cachemode_pfn(pfn_t_to_pfn(pfn), &pgprot); ptl = pud_lock(vma->vm_mm, vmf->pud); insert_pfn_pud(vma, addr, vmf->pud, pfn, write); diff --git a/mm/memory.c b/mm/memory.c index 99af83434e7c5..064fc55d8eab9 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2564,7 +2564,7 @@ vm_fault_t vmf_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr, if (!pfn_modify_allowed(pfn, pgprot)) return VM_FAULT_SIGBUS; - track_pfn_insert(vma, &pgprot, __pfn_to_pfn_t(pfn, PFN_DEV)); + pfnmap_setup_cachemode_pfn(pfn, &pgprot); return insert_pfn(vma, addr, __pfn_to_pfn_t(pfn, PFN_DEV), pgprot, false); @@ -2627,7 +2627,7 @@ static vm_fault_t __vm_insert_mixed(struct vm_area_struct *vma, if (addr < vma->vm_start || addr >= vma->vm_end) return VM_FAULT_SIGBUS; - track_pfn_insert(vma, &pgprot, pfn); + pfnmap_setup_cachemode_pfn(pfn_t_to_pfn(pfn), &pgprot); if (!pfn_modify_allowed(pfn_t_to_pfn(pfn), pgprot)) return VM_FAULT_SIGBUS; -- 2.49.0