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AJvYcCUjMbuV/ozv1iW5lz1WD+mUSu+awcihfFmw4EYAq7TzJpM3cwd8sXAayI/taAZwvYi0PgkHzmcG79P1f5o=@vger.kernel.org X-Gm-Message-State: AOJu0Yyhxn0dc1D+9arGQEloPs2pIg9HgVuTvPqV08SogVd9ehUdbzUn yWh3e1PEeXCYfmE/hxZTO8VOPT1hqqjUo91xv/SYKYiZC68neKmm X-Google-Smtp-Source: AGHT+IG89nPNiTxJdoeWAd4I9+Nt1kCBeEpf+Ehrfj9fghEkvWbqdwi+s8kDEywa2ecTlYbOssqipA== X-Received: by 2002:a17:902:e549:b0:202:671:e5bd with SMTP id d9443c01a7336-2020671f9b0mr167387315ad.42.1724174235653; Tue, 20 Aug 2024 10:17:15 -0700 (PDT) Received: from localhost ([2a00:79e1:abd:bd02:d0ce:e791:dc08:a375]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-201f038b303sm80401575ad.192.2024.08.20.10.17.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Aug 2024 10:17:15 -0700 (PDT) From: Rob Clark To: iommu@lists.linux.dev Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Mostafa Saleh , Will Deacon , Rob Clark , Robin Murphy , Joerg Roedel , Jason Gunthorpe , Kevin Tian , Joao Martins , Boris Brezillon , linux-arm-kernel@lists.infradead.org (moderated list:ARM SMMU DRIVERS), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v7 3/4] iommu/io-pgtable-arm: Add way to debug pgtable walk Date: Tue, 20 Aug 2024 10:16:46 -0700 Message-ID: <20240820171652.145673-4-robdclark@gmail.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240820171652.145673-1-robdclark@gmail.com> References: <20240820171652.145673-1-robdclark@gmail.com> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Rob Clark Add an io-pgtable method to walk the pgtable returning the raw PTEs that would be traversed for a given iova access. Signed-off-by: Rob Clark --- drivers/iommu/io-pgtable-arm.c | 25 +++++++++++++++++++++++++ include/linux/io-pgtable.h | 15 +++++++++++++++ 2 files changed, 40 insertions(+) diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index 5fa1274a665a..a666ee03de47 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -759,6 +759,30 @@ static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops, return iopte_to_paddr(d.pte, data) | iova; } +static int visit_pgtable_walk(struct io_pgtable_walk_data *walk_data, int lvl, + arm_lpae_iopte pte, size_t size) +{ + struct arm_lpae_io_pgtable_walk_data *data = walk_data->data; + data->ptes[data->level++] = pte; + return 0; +} + +static int arm_lpae_pgtable_walk(struct io_pgtable_ops *ops, unsigned long iova, + void *wd) +{ + struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); + struct io_pgtable_walk_data walk_data = { + .data = wd, + .visit = visit_pgtable_walk, + .addr = iova, + .end = iova + 1, + }; + + ((struct arm_lpae_io_pgtable_walk_data *)wd)->level = 0; + + return __arm_lpae_iopte_walk(data, &walk_data, data->pgd, data->start_level); +} + static int io_pgtable_visit(struct arm_lpae_io_pgtable *data, struct io_pgtable_walk_data *walk_data, arm_lpae_iopte *ptep, int lvl) @@ -928,6 +952,7 @@ arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg) .unmap_pages = arm_lpae_unmap_pages, .iova_to_phys = arm_lpae_iova_to_phys, .read_and_clear_dirty = arm_lpae_read_and_clear_dirty, + .pgtable_walk = arm_lpae_pgtable_walk, }; return data; diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h index f9a81761bfce..76eabd890e6a 100644 --- a/include/linux/io-pgtable.h +++ b/include/linux/io-pgtable.h @@ -174,12 +174,26 @@ struct io_pgtable_cfg { }; }; +/** + * struct arm_lpae_io_pgtable_walk_data - information from a pgtable walk + * + * @ptes: The recorded PTE values from the walk + * @level: The level of the last PTE + * + * @level also specifies the last valid index in @ptes + */ +struct arm_lpae_io_pgtable_walk_data { + u64 ptes[4]; + int level; +}; + /** * struct io_pgtable_ops - Page table manipulation API for IOMMU drivers. * * @map_pages: Map a physically contiguous range of pages of the same size. * @unmap_pages: Unmap a range of virtually contiguous pages of the same size. * @iova_to_phys: Translate iova to physical address. + * @pgtable_walk: (optional) Perform a page table walk for a given iova. * * These functions map directly onto the iommu_ops member functions with * the same names. @@ -193,6 +207,7 @@ struct io_pgtable_ops { struct iommu_iotlb_gather *gather); phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops, unsigned long iova); + int (*pgtable_walk)(struct io_pgtable_ops *ops, unsigned long iova, void *wd); int (*read_and_clear_dirty)(struct io_pgtable_ops *ops, unsigned long iova, size_t size, unsigned long flags,