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(unknown [IPv6:2a01:e0a:5e3:6100:826d:bc07:e98c:84a]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: loicmolinari) by bali.collaboradmins.com (Postfix) with ESMTPSA id BFFB917E1407; Tue, 21 Oct 2025 13:30:57 +0200 (CEST) From: =?UTF-8?q?Lo=C3=AFc=20Molinari?= To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , Boris Brezillon , Rob Herring , Steven Price , Liviu Dudau , Melissa Wen , =?UTF-8?q?Ma=C3=ADra=20Canal?= , Hugh Dickins , Baolin Wang , Andrew Morton , =?UTF-8?q?Lo=C3=AFc=20Molinari?= , Al Viro , =?UTF-8?q?Miko=C5=82aj=20Wasiak?= , Christian Brauner , Nitin Gote , Andi Shyti , Jonathan Corbet , Christopher Healy , Matthew Wilcox , Bagas Sanjaya Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, kernel@collabora.com Subject: [PATCH v5 03/12] drm/shmem-helper: Map huge pages in fault handlers Date: Tue, 21 Oct 2025 13:30:40 +0200 Message-ID: <20251021113049.17242-4-loic.molinari@collabora.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251021113049.17242-1-loic.molinari@collabora.com> References: <20251021113049.17242-1-loic.molinari@collabora.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Stat-Signature: gkqq1duf39rq5f58u685wzgqscx16cyr X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 9A4DF40005 X-HE-Tag: 1761046260-778467 X-HE-Meta: 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 DprgW/Hi rANTXxwHTWls39xqi6Z3VYwblUjMkYxbbb7p/iSiQ9imjAwVTHOmTe6KZzdAjWOdvNms8ePHhpDwEKo0BQZepdWnX3vj3/F/Mvggb9jyBM6SNonrQGd1IC/GQ1F0pRROYjKci3tUg2fsm2eqe75z34GufwcJ4QsN7gCSnJCk4LNxYjrjHfuK04STHXEunmIA+SinXE5ga0x2CqVZH2xYL6appiqolQpQLvfQ95FUohRzjxL3Obl6QWIlBPyydxn0BC6Nu5as8oYf1WVkCtKTRuyCH7tECVbHPcevQNI/1e8ww/41PBw+4uahuDDnVbDh49AtPesp+GRf+VG0lFbFrnub74WSmSKiBkmangu9r77B+1qF7waj/k8o/HcQA99DNDN+K 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: Check whether the starting address in the fault-around handler or the faulty address in the fault handler is part of a huge page in order to attempt a PMD sized PFN insertion into the VMA. On builds with CONFIG_TRANSPARENT_HUGEPAGE enabled, if the mmap() user address is PMD size aligned, if the GEM object is backed by shmem buffers on mountpoints setting the 'huge=' option and if the shmem backing store manages to allocate a huge folio, CPU mapping would then benefit from significantly increased memcpy() performance. When these conditions are met on a system with 2 MiB huge pages, an aligned copy of 2 MiB would raise a single page fault instead of 4096. v4: - implement map_pages instead of huge_fault Signed-off-by: Loïc Molinari --- drivers/gpu/drm/drm_gem_shmem_helper.c | 30 ++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index 2a9fbc9c3712..b7238448d4f9 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -580,6 +580,26 @@ static bool drm_gem_shmem_fault_is_valid(struct drm_gem_object *obj, return true; } +static bool drm_gem_shmem_map_pmd(struct vm_fault *vmf, unsigned long addr, + struct page *page) +{ +#ifdef CONFIG_ARCH_SUPPORTS_PMD_PFNMAP + unsigned long pfn = page_to_pfn(page); + unsigned long paddr = pfn << PAGE_SHIFT; + bool aligned = (addr & ~PMD_MASK) == (paddr & ~PMD_MASK); + + if (aligned && + pmd_none(*vmf->pmd) && + folio_test_pmd_mappable(page_folio(page))) { + pfn &= PMD_MASK >> PAGE_SHIFT; + if (vmf_insert_pfn_pmd(vmf, pfn, false) == VM_FAULT_NOPAGE) + return true; + } +#endif + + return false; +} + static vm_fault_t drm_gem_shmem_map_pages(struct vm_fault *vmf, pgoff_t start_pgoff, pgoff_t end_pgoff) @@ -606,6 +626,11 @@ static vm_fault_t drm_gem_shmem_map_pages(struct vm_fault *vmf, goto out; } + if (drm_gem_shmem_map_pmd(vmf, addr, pages[start_pgoff])) { + ret = VM_FAULT_NOPAGE; + goto out; + } + /* Map a range of pages around the faulty address. */ do { pfn = page_to_pfn(pages[start_pgoff]); @@ -639,6 +664,11 @@ static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf) goto out; } + if (drm_gem_shmem_map_pmd(vmf, vmf->address, pages[page_offset])) { + ret = VM_FAULT_NOPAGE; + goto out; + } + pfn = page_to_pfn(pages[page_offset]); ret = vmf_insert_pfn(vma, vmf->address, pfn); -- 2.47.3