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AJvYcCUwPRId8HW9kPQzN6t+H+19y6/uprdIh7UtTLfvQj0hiKPDAJRhNapXppanvNMugBiD8f999NFsT0wbMKQ=@vger.kernel.org X-Gm-Message-State: AOJu0YxX4EtI4SyQaEFuTMDAKP4TcIfpIzhYtu2YGdTqZviBARGKX745 +AfEeJQAtid99RBOi2FuPDzo4dCIcBR+TPATe+WEXPTKu0o7IP+DJWdjtmHnTXeC43sMy5EAK1V qLRJ+bvOdrqwx4Q== X-Received: from wrbef5.prod.google.com ([2002:a05:6000:2185:b0:435:8d79:2bc8]) (user=smostafa job=prod-delivery.src-stubby-dispatcher) by 2002:a5d:5f90:0:b0:42f:bc61:d1bd with SMTP id ffacd0b85a97d-4358ff62652mr1802129f8f.45.1768900773611; Tue, 20 Jan 2026 01:19:33 -0800 (PST) Date: Tue, 20 Jan 2026 09:19:26 +0000 In-Reply-To: <20260120091926.670155-1-smostafa@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260120091926.670155-1-smostafa@google.com> X-Mailer: git-send-email 2.52.0.457.g6b5491de43-goog Message-ID: <20260120091926.670155-3-smostafa@google.com> Subject: [PATCH v2 2/2] iommu: debug-pagealloc: Use page_ext_get_from_phys() From: Mostafa Saleh To: linux-mm@kvack.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Cc: corbet@lwn.net, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, akpm@linux-foundation.org, vbabka@suse.cz, surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, david@redhat.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, rppt@kernel.org, xiaqinxin@huawei.com, baolu.lu@linux.intel.com, rdunlap@infradead.org, Mostafa Saleh Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Instead of calling pfn_valid() and then getting the page, call the newly added function page_ext_get_from_phys(), which would also check for MMIO and offline memory and return NULL in that case. Signed-off-by: Mostafa Saleh --- drivers/iommu/iommu-debug-pagealloc.c | 31 ++++++++++++--------------- 1 file changed, 14 insertions(+), 17 deletions(-) diff --git a/drivers/iommu/iommu-debug-pagealloc.c b/drivers/iommu/iommu-de= bug-pagealloc.c index c080a38f45a4..80164df5bab1 100644 --- a/drivers/iommu/iommu-debug-pagealloc.c +++ b/drivers/iommu/iommu-debug-pagealloc.c @@ -30,14 +30,6 @@ struct page_ext_operations page_iommu_debug_ops =3D { .need =3D need_iommu_debug, }; =20 -static struct page_ext *get_iommu_page_ext(phys_addr_t phys) -{ - struct page *page =3D phys_to_page(phys); - struct page_ext *page_ext =3D page_ext_get(page); - - return page_ext; -} - static struct iommu_debug_metadata *get_iommu_data(struct page_ext *page_e= xt) { return page_ext_data(page_ext, &page_iommu_debug_ops); @@ -45,18 +37,26 @@ static struct iommu_debug_metadata *get_iommu_data(stru= ct page_ext *page_ext) =20 static void iommu_debug_inc_page(phys_addr_t phys) { - struct page_ext *page_ext =3D get_iommu_page_ext(phys); - struct iommu_debug_metadata *d =3D get_iommu_data(page_ext); + struct page_ext *page_ext =3D page_ext_from_phys(phys); + struct iommu_debug_metadata *d; + + if (!page_ext) + return; =20 + d =3D get_iommu_data(page_ext); WARN_ON(atomic_inc_return_relaxed(&d->ref) <=3D 0); page_ext_put(page_ext); } =20 static void iommu_debug_dec_page(phys_addr_t phys) { - struct page_ext *page_ext =3D get_iommu_page_ext(phys); - struct iommu_debug_metadata *d =3D get_iommu_data(page_ext); + struct page_ext *page_ext =3D page_ext_from_phys(phys); + struct iommu_debug_metadata *d; + + if (!page_ext) + return; =20 + d =3D get_iommu_data(page_ext); WARN_ON(atomic_dec_return_relaxed(&d->ref) < 0); page_ext_put(page_ext); } @@ -104,11 +104,8 @@ void __iommu_debug_map(struct iommu_domain *domain, ph= ys_addr_t phys, size_t siz if (WARN_ON(!phys || check_add_overflow(phys, size, &end))) return; =20 - for (off =3D 0 ; off < size ; off +=3D page_size) { - if (!pfn_valid(__phys_to_pfn(phys + off))) - continue; + for (off =3D 0 ; off < size ; off +=3D page_size) iommu_debug_inc_page(phys + off); - } } =20 static void __iommu_debug_update_iova(struct iommu_domain *domain, @@ -123,7 +120,7 @@ static void __iommu_debug_update_iova(struct iommu_doma= in *domain, for (off =3D 0 ; off < size ; off +=3D page_size) { phys_addr_t phys =3D iommu_iova_to_phys(domain, iova + off); =20 - if (!phys || !pfn_valid(__phys_to_pfn(phys))) + if (!phys) continue; =20 if (inc) --=20 2.52.0.457.g6b5491de43-goog