| Message ID | 20240820171652.145673-3-robdclark@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | io-pgtable-arm + drm/msm: Extend iova fault debugging | expand |
On Tue, Aug 20, 2024 at 10:16:45AM -0700, Rob Clark wrote: > From: Rob Clark <robdclark@chromium.org> > > Re-use the generic pgtable walk path. > > Signed-off-by: Rob Clark <robdclark@chromium.org> > --- > drivers/iommu/io-pgtable-arm.c | 73 +++++++++++++++++----------------- > 1 file changed, 36 insertions(+), 37 deletions(-) > > diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c > index b4bc358740e0..5fa1274a665a 100644 > --- a/drivers/iommu/io-pgtable-arm.c > +++ b/drivers/iommu/io-pgtable-arm.c > @@ -710,42 +710,6 @@ 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 { > void *data; > int (*visit)(struct io_pgtable_walk_data *walk_data, int lvl, > @@ -760,6 +724,41 @@ 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 pte, size_t size) > +{ > + struct iova_to_phys_data *data = walk_data->data; > + data->pte = pte; > + 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) > @@ -776,7 +775,7 @@ static int io_pgtable_visit(struct arm_lpae_io_pgtable *data, > return 0; > } > > - if (WARN_ON(!iopte_table(pte, lvl))) > + if (WARN_ON(!iopte_table(pte, lvl) && !selftest_running)) Why do you care about the selftest here? Will
On Fri, Aug 23, 2024 at 9:11 AM Will Deacon <will@kernel.org> wrote: > > On Tue, Aug 20, 2024 at 10:16:45AM -0700, Rob Clark wrote: > > From: Rob Clark <robdclark@chromium.org> > > > > Re-use the generic pgtable walk path. > > > > Signed-off-by: Rob Clark <robdclark@chromium.org> > > --- > > drivers/iommu/io-pgtable-arm.c | 73 +++++++++++++++++----------------- > > 1 file changed, 36 insertions(+), 37 deletions(-) > > > > diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c > > index b4bc358740e0..5fa1274a665a 100644 > > --- a/drivers/iommu/io-pgtable-arm.c > > +++ b/drivers/iommu/io-pgtable-arm.c > > @@ -710,42 +710,6 @@ 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 { > > void *data; > > int (*visit)(struct io_pgtable_walk_data *walk_data, int lvl, > > @@ -760,6 +724,41 @@ 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 pte, size_t size) > > +{ > > + struct iova_to_phys_data *data = walk_data->data; > > + data->pte = pte; > > + 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) > > @@ -776,7 +775,7 @@ static int io_pgtable_visit(struct arm_lpae_io_pgtable *data, > > return 0; > > } > > > > - if (WARN_ON(!iopte_table(pte, lvl))) > > + if (WARN_ON(!iopte_table(pte, lvl) && !selftest_running)) > > Why do you care about the selftest here? Otherwise we see a flood of WARN_ON from negative tests in the selftests BR, -R > Will
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index b4bc358740e0..5fa1274a665a 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -710,42 +710,6 @@ 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 { void *data; int (*visit)(struct io_pgtable_walk_data *walk_data, int lvl, @@ -760,6 +724,41 @@ 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 pte, size_t size) +{ + struct iova_to_phys_data *data = walk_data->data; + data->pte = pte; + 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) @@ -776,7 +775,7 @@ static int io_pgtable_visit(struct arm_lpae_io_pgtable *data, return 0; } - if (WARN_ON(!iopte_table(pte, lvl))) + if (WARN_ON(!iopte_table(pte, lvl) && !selftest_running)) return -EINVAL; ptep = iopte_deref(pte, data);