Introduce handling of driver options. Options are set based on DT information when probing an SMMU device. The first option introduced is "arm,smmu-isolate-devices". (It will be used in the bus notifier block.)
Signed-off-by: Andreas Herrmann <[email protected]> --- drivers/iommu/arm-smmu.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index b632bcd..b127f0f 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -348,6 +348,7 @@ struct arm_smmu_device { #define ARM_SMMU_FEAT_TRANS_S2 (1 << 3) #define ARM_SMMU_FEAT_TRANS_NESTED (1 << 4) u32 features; + u32 options; int version; u32 num_context_banks; @@ -398,6 +399,52 @@ struct arm_smmu_domain { static DEFINE_SPINLOCK(arm_smmu_devices_lock); static LIST_HEAD(arm_smmu_devices); +/* driver options */ +enum arm_smmu_option { + ISOLATE_DEVICES = 0, + OPTION_MAX, +}; + +struct arm_smmu_option_prop { + enum arm_smmu_option opt; + const char *prop; +}; + +static struct arm_smmu_option_prop arm_smmu_options [] = { + { ISOLATE_DEVICES, "arm,smmu-isolate-devices" }, + { OPTION_MAX, NULL}, +}; + +static inline int arm_smmu_has_option(struct arm_smmu_device *smmu, + enum arm_smmu_option opt) +{ + return (smmu->options & (1 << opt)); +} + +static inline void arm_smmu_set_option(struct arm_smmu_device *smmu, + enum arm_smmu_option opt) +{ + smmu->options |= (1 << opt); +} + +static inline void arm_smmu_clear_option(struct arm_smmu_device *smmu, + enum arm_smmu_option opt) +{ + smmu->options &= ~(1 << opt); +} + +static void arm_smmu_check_options(struct arm_smmu_device *smmu) +{ + int i = 0; + + do { + if (of_property_read_bool(smmu->dev->of_node, + arm_smmu_options[i].prop)) + arm_smmu_set_option(smmu, arm_smmu_options[i].opt); + i++; + } while (arm_smmu_options[i].opt < OPTION_MAX); +} + static struct arm_smmu_master *find_smmu_master(struct arm_smmu_device *smmu, struct device_node *dev_node) { @@ -1791,6 +1838,8 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev) } smmu->dev = dev; + arm_smmu_check_options(smmu); + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(dev, "missing base address/size\n"); -- 1.7.9.5 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
