| Message ID | 17-v6-e8114faedade+425-iommu_all_defdom_jgg@nvidia.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | iommu: Make default_domain's mandatory | expand |
On 2023/8/3 8:08, Jason Gunthorpe wrote: > This brings back the ops->detach_dev() code that commit > 1b932ceddd19 ("iommu: Remove detach_dev callbacks") deleted and turns it > into an IDENTITY domain. > > Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> > --- > drivers/iommu/arm/arm-smmu/qcom_iommu.c | 39 +++++++++++++++++++++++++ > 1 file changed, 39 insertions(+) > > diff --git a/drivers/iommu/arm/arm-smmu/qcom_iommu.c b/drivers/iommu/arm/arm-smmu/qcom_iommu.c > index a503ed758ec302..9d7b9d8b4386d4 100644 > --- a/drivers/iommu/arm/arm-smmu/qcom_iommu.c > +++ b/drivers/iommu/arm/arm-smmu/qcom_iommu.c > @@ -387,6 +387,44 @@ static int qcom_iommu_attach_dev(struct iommu_domain *domain, struct device *dev > return 0; > } > > +static int qcom_iommu_identity_attach(struct iommu_domain *identity_domain, > + struct device *dev) > +{ > + struct iommu_domain *domain = iommu_get_domain_for_dev(dev); > + struct qcom_iommu_domain *qcom_domain; > + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); > + struct qcom_iommu_dev *qcom_iommu = to_iommu(dev); > + unsigned int i; > + > + if (domain == identity_domain || !domain) > + return 0; > + > + qcom_domain = to_qcom_iommu_domain(domain); > + if (WARN_ON(!qcom_domain->iommu)) > + return -EINVAL; > + > + pm_runtime_get_sync(qcom_iommu->dev); > + for (i = 0; i < fwspec->num_ids; i++) { > + struct qcom_iommu_ctx *ctx = to_ctx(qcom_domain, fwspec->ids[i]); > + > + /* Disable the context bank: */ > + iommu_writel(ctx, ARM_SMMU_CB_SCTLR, 0); > + > + ctx->domain = NULL; Does setting ctx->domain to NULL still match this semantics? > + } > + pm_runtime_put_sync(qcom_iommu->dev); > + return 0; > +} > + > +static struct iommu_domain_ops qcom_iommu_identity_ops = { > + .attach_dev = qcom_iommu_identity_attach, > +}; > + > +static struct iommu_domain qcom_iommu_identity_domain = { > + .type = IOMMU_DOMAIN_IDENTITY, > + .ops = &qcom_iommu_identity_ops, > +}; > + > static int qcom_iommu_map(struct iommu_domain *domain, unsigned long iova, > phys_addr_t paddr, size_t pgsize, size_t pgcount, > int prot, gfp_t gfp, size_t *mapped) > @@ -553,6 +591,7 @@ static int qcom_iommu_of_xlate(struct device *dev, struct of_phandle_args *args) > } > > static const struct iommu_ops qcom_iommu_ops = { > + .identity_domain = &qcom_iommu_identity_domain, > .capable = qcom_iommu_capable, > .domain_alloc = qcom_iommu_domain_alloc, > .probe_device = qcom_iommu_probe_device, Anyway, Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Best regards, baolu
On Mon, Aug 14, 2023 at 02:32:33PM +0800, Baolu Lu wrote: > > + pm_runtime_get_sync(qcom_iommu->dev); > > + for (i = 0; i < fwspec->num_ids; i++) { > > + struct qcom_iommu_ctx *ctx = to_ctx(qcom_domain, fwspec->ids[i]); > > + > > + /* Disable the context bank: */ > > + iommu_writel(ctx, ARM_SMMU_CB_SCTLR, 0); > > + > > + ctx->domain = NULL; > > Does setting ctx->domain to NULL still match this semantics? Yes, I did not try to fix this driver. NULL means identity in the ctx->domain. Thanks, Jason
On 2023/8/14 23:36, Jason Gunthorpe wrote: > On Mon, Aug 14, 2023 at 02:32:33PM +0800, Baolu Lu wrote: > >>> + pm_runtime_get_sync(qcom_iommu->dev); >>> + for (i = 0; i < fwspec->num_ids; i++) { >>> + struct qcom_iommu_ctx *ctx = to_ctx(qcom_domain, fwspec->ids[i]); >>> + >>> + /* Disable the context bank: */ >>> + iommu_writel(ctx, ARM_SMMU_CB_SCTLR, 0); >>> + >>> + ctx->domain = NULL; >> Does setting ctx->domain to NULL still match this semantics? > Yes, I did not try to fix this driver. NULL means identity in the > ctx->domain. Okay. Best regards, baolu
diff --git a/drivers/iommu/arm/arm-smmu/qcom_iommu.c b/drivers/iommu/arm/arm-smmu/qcom_iommu.c index a503ed758ec302..9d7b9d8b4386d4 100644 --- a/drivers/iommu/arm/arm-smmu/qcom_iommu.c +++ b/drivers/iommu/arm/arm-smmu/qcom_iommu.c @@ -387,6 +387,44 @@ static int qcom_iommu_attach_dev(struct iommu_domain *domain, struct device *dev return 0; } +static int qcom_iommu_identity_attach(struct iommu_domain *identity_domain, + struct device *dev) +{ + struct iommu_domain *domain = iommu_get_domain_for_dev(dev); + struct qcom_iommu_domain *qcom_domain; + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); + struct qcom_iommu_dev *qcom_iommu = to_iommu(dev); + unsigned int i; + + if (domain == identity_domain || !domain) + return 0; + + qcom_domain = to_qcom_iommu_domain(domain); + if (WARN_ON(!qcom_domain->iommu)) + return -EINVAL; + + pm_runtime_get_sync(qcom_iommu->dev); + for (i = 0; i < fwspec->num_ids; i++) { + struct qcom_iommu_ctx *ctx = to_ctx(qcom_domain, fwspec->ids[i]); + + /* Disable the context bank: */ + iommu_writel(ctx, ARM_SMMU_CB_SCTLR, 0); + + ctx->domain = NULL; + } + pm_runtime_put_sync(qcom_iommu->dev); + return 0; +} + +static struct iommu_domain_ops qcom_iommu_identity_ops = { + .attach_dev = qcom_iommu_identity_attach, +}; + +static struct iommu_domain qcom_iommu_identity_domain = { + .type = IOMMU_DOMAIN_IDENTITY, + .ops = &qcom_iommu_identity_ops, +}; + static int qcom_iommu_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t paddr, size_t pgsize, size_t pgcount, int prot, gfp_t gfp, size_t *mapped) @@ -553,6 +591,7 @@ static int qcom_iommu_of_xlate(struct device *dev, struct of_phandle_args *args) } static const struct iommu_ops qcom_iommu_ops = { + .identity_domain = &qcom_iommu_identity_domain, .capable = qcom_iommu_capable, .domain_alloc = qcom_iommu_domain_alloc, .probe_device = qcom_iommu_probe_device,
This brings back the ops->detach_dev() code that commit 1b932ceddd19 ("iommu: Remove detach_dev callbacks") deleted and turns it into an IDENTITY domain. Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> --- drivers/iommu/arm/arm-smmu/qcom_iommu.c | 39 +++++++++++++++++++++++++ 1 file changed, 39 insertions(+)