On 2020-11-23 20:48, Will Deacon wrote:
On Tue, Nov 17, 2020 at 08:00:41PM +0530, Sai Prakash Ranjan wrote:
Add iommu domain attribute for pagetable configuration which initially will be used to set quirks like for system cache aka last level cache to be used by client drivers like GPU to set right attributes for caching the hardware pagetables into the system cache and later can be extended to include other page table configuration data.
Signed-off-by: Sai Prakash Ranjan saiprakash.ranjan@codeaurora.org
drivers/iommu/arm/arm-smmu/arm-smmu.c | 25 +++++++++++++++++++++++++ drivers/iommu/arm/arm-smmu/arm-smmu.h | 1 + include/linux/io-pgtable.h | 4 ++++ include/linux/iommu.h | 1 + 4 files changed, 31 insertions(+)
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c index 0f28a8614da3..7b05782738e2 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c @@ -789,6 +789,9 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain, if (smmu_domain->non_strict) pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT;
- if (smmu_domain->pgtbl_cfg.quirks)
pgtbl_cfg.quirks |= smmu_domain->pgtbl_cfg.quirks;- pgtbl_ops = alloc_io_pgtable_ops(fmt, &pgtbl_cfg, smmu_domain); if (!pgtbl_ops) { ret = -ENOMEM;
@@ -1511,6 +1514,12 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain, case DOMAIN_ATTR_NESTING: *(int *)data = (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED); return 0;
case DOMAIN_ATTR_IO_PGTABLE_CFG: {struct domain_attr_io_pgtbl_cfg *pgtbl_cfg = data;*pgtbl_cfg = smmu_domain->pgtbl_cfg;return 0;}@@ -1551,6 +1560,22 @@ static int arm_smmu_domain_set_attr(struct iommu_domain *domain, else smmu_domain->stage = ARM_SMMU_DOMAIN_S1; break;
case DOMAIN_ATTR_IO_PGTABLE_CFG: {struct domain_attr_io_pgtbl_cfg *pgtbl_cfg = data;if (smmu_domain->smmu) {ret = -EPERM;goto out_unlock;}if (!pgtbl_cfg) {Do we really need to check this? If somebody passed us a NULL pointer then they have a bug and we don't check this for other domain attributes afaict.
True, I'll drop it.
ret = -ENODEV;goto out_unlock;}smmu_domain->pgtbl_cfg = *pgtbl_cfg;break;}diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h b/drivers/iommu/arm/arm-smmu/arm-smmu.h index 04288b6fc619..18fbed376afb 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu.h +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h @@ -364,6 +364,7 @@ enum arm_smmu_domain_stage { struct arm_smmu_domain { struct arm_smmu_device *smmu; struct io_pgtable_ops *pgtbl_ops;
- struct domain_attr_io_pgtbl_cfg pgtbl_cfg; const struct iommu_flush_ops *flush_ops; struct arm_smmu_cfg cfg; enum arm_smmu_domain_stage stage;
diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h index a9a2c59fab37..686b37d48743 100644 --- a/include/linux/io-pgtable.h +++ b/include/linux/io-pgtable.h @@ -212,6 +212,10 @@ struct io_pgtable {
#define io_pgtable_ops_to_pgtable(x) container_of((x), struct io_pgtable, ops)
+struct domain_attr_io_pgtbl_cfg {
- unsigned long quirks;
+};
nit: Can you rename this to 'struct io_pgtable_domain_attr' please?
Done, thanks.