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[34.79.100.158]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-385e4617a61sm12383645f8f.3.2024.12.04.02.14.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Dec 2024 02:14:08 -0800 (PST) Date: Wed, 4 Dec 2024 10:14:04 +0000 From: Mostafa Saleh To: Rob Clark Cc: iommu@lists.linux.dev, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Will Deacon , Robin Murphy , Rob Clark , Joerg Roedel , "moderated list:ARM SMMU DRIVERS" , open list Subject: Re: [PATCH v10 2/4] iommu/io-pgtable-arm: Re-use the pgtable walk for iova_to_phys Message-ID: References: <20241028213146.238941-1-robdclark@gmail.com> <20241028213146.238941-3-robdclark@gmail.com> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241028213146.238941-3-robdclark@gmail.com> Hi Rob, On Mon, Oct 28, 2024 at 02:31:38PM -0700, Rob Clark wrote: > From: Rob Clark > > Re-use the generic pgtable walk path. > > Signed-off-by: Rob Clark Reviewed-by: Mostafa Saleh Thanks, Mostafa > --- > drivers/iommu/io-pgtable-arm.c | 74 +++++++++++++++++----------------- > 1 file changed, 37 insertions(+), 37 deletions(-) > > diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c > index 7e9c0f8ae138..88b128c77893 100644 > --- a/drivers/iommu/io-pgtable-arm.c > +++ b/drivers/iommu/io-pgtable-arm.c > @@ -712,42 +712,6 @@ static size_t arm_lpae_unmap_pages(struct io_pgtable_ops *ops, unsigned long iov > data->start_level, ptep); > } > > -static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops, > - unsigned long iova) > -{ > - struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); > - arm_lpae_iopte pte, *ptep = data->pgd; > - int lvl = data->start_level; > - > - do { > - /* Valid IOPTE pointer? */ > - if (!ptep) > - return 0; > - > - /* Grab the IOPTE we're interested in */ > - ptep += ARM_LPAE_LVL_IDX(iova, lvl, data); > - pte = READ_ONCE(*ptep); > - > - /* Valid entry? */ > - if (!pte) > - return 0; > - > - /* Leaf entry? */ > - if (iopte_leaf(pte, lvl, data->iop.fmt)) > - goto found_translation; > - > - /* Take it to the next level */ > - ptep = iopte_deref(pte, data); > - } while (++lvl < ARM_LPAE_MAX_LEVELS); > - > - /* Ran out of page tables to walk */ > - return 0; > - > -found_translation: > - iova &= (ARM_LPAE_BLOCK_SIZE(lvl, data) - 1); > - return iopte_to_paddr(pte, data) | iova; > -} > - > struct io_pgtable_walk_data { > struct io_pgtable *iop; > void *data; > @@ -763,6 +727,41 @@ static int __arm_lpae_iopte_walk(struct arm_lpae_io_pgtable *data, > arm_lpae_iopte *ptep, > int lvl); > > +struct iova_to_phys_data { > + arm_lpae_iopte pte; > + int lvl; > +}; > + > +static int visit_iova_to_phys(struct io_pgtable_walk_data *walk_data, int lvl, > + arm_lpae_iopte *ptep, size_t size) > +{ > + struct iova_to_phys_data *data = walk_data->data; > + data->pte = *ptep; > + data->lvl = lvl; > + return 0; > +} > + > +static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops, > + unsigned long iova) > +{ > + struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); > + struct iova_to_phys_data d; > + struct io_pgtable_walk_data walk_data = { > + .data = &d, > + .visit = visit_iova_to_phys, > + .addr = iova, > + .end = iova + 1, > + }; > + int ret; > + > + ret = __arm_lpae_iopte_walk(data, &walk_data, data->pgd, data->start_level); > + if (ret) > + return 0; > + > + iova &= (ARM_LPAE_BLOCK_SIZE(d.lvl, data) - 1); > + return iopte_to_paddr(d.pte, data) | iova; > +} > + > static int io_pgtable_visit(struct arm_lpae_io_pgtable *data, > struct io_pgtable_walk_data *walk_data, > arm_lpae_iopte *ptep, int lvl) > @@ -780,8 +779,9 @@ static int io_pgtable_visit(struct arm_lpae_io_pgtable *data, > return 0; > } > > - if (WARN_ON(!iopte_table(pte, lvl))) > + if (!iopte_table(pte, lvl)) { > return -EINVAL; > + } > > ptep = iopte_deref(pte, data); > return __arm_lpae_iopte_walk(data, walk_data, ptep, lvl + 1); > -- > 2.47.0 >