Some client devices want to directly map the IOMMU themselves instead of using the DMA domain. Allow those devices to opt in to direct mapping by way of a list of compatible strings.
v3: use iommu_request_dm_for_dev() to set up a default identity domain for a group, per Robin Signed-off-by: Jordan Crouse <jcro...@codeaurora.org> --- drivers/iommu/arm-smmu.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 5e54cc0..7537639 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -1235,6 +1235,35 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain, return 0; } +struct arm_smmu_client_match_data { + bool direct_mapping; +}; + +static const struct arm_smmu_client_match_data qcom_adreno = { + .direct_mapping = true, +}; + +static const struct arm_smmu_client_match_data qcom_mdss = { + .direct_mapping = true, +}; + +static const struct of_device_id arm_smmu_client_of_match[] = { + { .compatible = "qcom,adreno", .data = &qcom_adreno }, + { .compatible = "qcom,mdp4", .data = &qcom_mdss }, + { .compatible = "qcom,mdss", .data = &qcom_mdss }, + { .compatible = "qcom,sdm845-mdss", .data = &qcom_mdss }, + {}, +}; + +static const struct arm_smmu_client_match_data * +arm_smmu_client_data(struct device *dev) +{ + const struct of_device_id *match = + of_match_device(arm_smmu_client_of_match, dev); + + return match ? match->data : NULL; +} + static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) { int ret; @@ -1450,6 +1479,7 @@ static int arm_smmu_add_device(struct device *dev) struct arm_smmu_device *smmu; struct arm_smmu_master_cfg *cfg; struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); + const struct arm_smmu_client_match_data *client; int i, ret; if (using_legacy_binding) { @@ -1512,6 +1542,11 @@ static int arm_smmu_add_device(struct device *dev) device_link_add(dev, smmu->dev, DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_SUPPLIER); + client = arm_smmu_client_data(dev); + + if (client && client->direct_mapping) + iommu_request_dm_for_dev(dev); + return 0; out_cfg_free: -- 2.7.4 _______________________________________________ Freedreno mailing list Freedreno@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/freedreno