On Thu, Mar 30, 2017 at 2:19 AM, Archit Taneja <architt@xxxxxxxxxxxxxx> wrote:
> Hi,
>
> On 03/14/2017 08:48 PM, Rob Clark wrote:
>>
>> An iommu driver for Qualcomm "B" family devices which do not completely
>> implement the ARM SMMU spec. These devices have context-bank register
>> layout that is similar to ARM SMMU, but no global register space (or at
>> least not one that is accessible).
>>
>> Signed-off-by: Rob Clark <robdclark@xxxxxxxxx>
>> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@xxxxxxxxxx>
>> ---
>> drivers/iommu/Kconfig | 10 +
>> drivers/iommu/Makefile | 1 +
>> drivers/iommu/arm-smmu-regs.h | 2 +
>> drivers/iommu/qcom_iommu.c | 818
>> ++++++++++++++++++++++++++++++++++++++++++
>> 4 files changed, 831 insertions(+)
>> create mode 100644 drivers/iommu/qcom_iommu.c
>
>
> <snip>
>
>> +
>> +static int qcom_iommu_add_device(struct device *dev)
>> +{
>> + struct qcom_iommu_dev *qcom_iommu = __to_iommu(dev->iommu_fwspec);
>
>
> __to_iommu() has a WARN_ON() that gets triggered here for all devices on
> the platform bus that aren't backed by our iommu. We should return -ENODEV
> for all of them without throwing a warning.
>
>> + struct iommu_group *group;
>> + struct device_link *link;
>> +
>
>
> We could do something like:
>
> if (fwspec && fwspec->ops == &qcom_iommu_ops)
> qcom_iommu = __to_iommu(fwspec);
> else
> qcom_iommu = NULL;
thanks.. I wonder how I wasn't hitting that?
I'll incorporate this (plus small dt bindings doc update) into next
version.. probably won't have time to send until the weekend or next
week
BR,
-R
> Thanks,
> Archit
>
>
>> + if (!qcom_iommu)
>> + return -ENODEV;
>> +
>> + /*
>> + * Establish the link between iommu and master, so that the
>> + * iommu gets runtime enabled/disabled as per the master's
>> + * needs.
>> + */
>> + link = device_link_add(dev, qcom_iommu->dev, DL_FLAG_PM_RUNTIME);
>> + if (!link) {
>> + dev_err(qcom_iommu->dev, "Unable to create device link
>> between %s and %s\n",
>> + dev_name(qcom_iommu->dev), dev_name(dev));
>> + return -ENODEV;
>> + }
>> +
>> + group = iommu_group_get_for_dev(dev);
>> + if (IS_ERR_OR_NULL(group))
>> + return PTR_ERR_OR_ZERO(group);
>> +
>> + iommu_group_put(group);
>> + iommu_device_link(&qcom_iommu->iommu, dev);
>> +
>> + return 0;
>> +}
>> +
>> +static void qcom_iommu_remove_device(struct device *dev)
>> +{
>> + struct qcom_iommu_dev *qcom_iommu = __to_iommu(dev->iommu_fwspec);
>> +
>> + if (!qcom_iommu)
>> + return;
>> +
>> + iommu_group_remove_device(dev);
>> + iommu_device_unlink(&qcom_iommu->iommu, dev);
>> + iommu_fwspec_free(dev);
>> +}
>> +
>> +static struct iommu_group *qcom_iommu_device_group(struct device *dev)
>> +{
>> + struct iommu_fwspec *fwspec = dev->iommu_fwspec;
>> + struct iommu_group *group = NULL;
>> + unsigned i;
>> +
>> + for (i = 0; i < fwspec->num_ids; i++) {
>> + struct qcom_iommu_ctx *ctx = __to_ctx(fwspec,
>> fwspec->ids[i]);
>> +
>> + if (group && ctx->group && group != ctx->group)
>> + return ERR_PTR(-EINVAL);
>> +
>> + group = ctx->group;
>> + }
>> +
>> + if (group)
>> + return iommu_group_ref_get(group);
>> +
>> + group = generic_device_group(dev);
>> +
>> + for (i = 0; i < fwspec->num_ids; i++) {
>> + struct qcom_iommu_ctx *ctx = __to_ctx(fwspec,
>> fwspec->ids[i]);
>> + ctx->group = iommu_group_ref_get(group);
>> + }
>> +
>> + return group;
>> +}
>> +
>> +static int qcom_iommu_of_xlate(struct device *dev, struct of_phandle_args
>> *args)
>> +{
>> + struct platform_device *iommu_pdev;
>> +
>> + if (args->args_count != 1) {
>> + dev_err(dev, "incorrect number of iommu params found for
>> %s "
>> + "(found %d, expected 1)\n",
>> + args->np->full_name, args->args_count);
>> + return -EINVAL;
>> + }
>> +
>> + if (!dev->iommu_fwspec->iommu_priv) {
>> + iommu_pdev = of_find_device_by_node(args->np);
>> + if (WARN_ON(!iommu_pdev))
>> + return -EINVAL;
>> +
>> + dev->iommu_fwspec->iommu_priv =
>> platform_get_drvdata(iommu_pdev);
>> + }
>> +
>> + return iommu_fwspec_add_ids(dev, &args->args[0], 1);
>> +}
>> +
>> +static const struct iommu_ops qcom_iommu_ops = {
>> + .capable = qcom_iommu_capable,
>> + .domain_alloc = qcom_iommu_domain_alloc,
>> + .domain_free = qcom_iommu_domain_free,
>> + .attach_dev = qcom_iommu_attach_dev,
>> + .detach_dev = qcom_iommu_detach_dev,
>> + .map = qcom_iommu_map,
>> + .unmap = qcom_iommu_unmap,
>> + .map_sg = default_iommu_map_sg,
>> + .iova_to_phys = qcom_iommu_iova_to_phys,
>> + .add_device = qcom_iommu_add_device,
>> + .remove_device = qcom_iommu_remove_device,
>> + .device_group = qcom_iommu_device_group,
>> + .of_xlate = qcom_iommu_of_xlate,
>> + .pgsize_bitmap = SZ_4K | SZ_64K | SZ_1M | SZ_16M,
>> +};
>> +
>> +static int qcom_iommu_enable_clocks(struct qcom_iommu_dev *qcom_iommu)
>> +{
>> + int ret;
>> +
>> + ret = clk_prepare_enable(qcom_iommu->iface_clk);
>> + if (ret) {
>> + dev_err(qcom_iommu->dev, "Couldn't enable iface_clk\n");
>> + return ret;
>> + }
>> +
>> + ret = clk_prepare_enable(qcom_iommu->bus_clk);
>> + if (ret) {
>> + dev_err(qcom_iommu->dev, "Couldn't enable bus_clk\n");
>> + clk_disable_unprepare(qcom_iommu->iface_clk);
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static void qcom_iommu_disable_clocks(struct qcom_iommu_dev *qcom_iommu)
>> +{
>> + clk_disable_unprepare(qcom_iommu->bus_clk);
>> + clk_disable_unprepare(qcom_iommu->iface_clk);
>> +}
>> +
>> +static int qcom_iommu_ctx_probe(struct platform_device *pdev)
>> +{
>> + struct qcom_iommu_ctx *ctx;
>> + struct device *dev = &pdev->dev;
>> + struct qcom_iommu_dev *qcom_iommu = dev_get_drvdata(dev->parent);
>> + struct resource *res;
>> + int ret;
>> + u32 reg;
>> +
>> + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
>> + if (!ctx)
>> + return -ENOMEM;
>> +
>> + ctx->dev = dev;
>> + platform_set_drvdata(pdev, ctx);
>> +
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + ctx->base = devm_ioremap_resource(dev, res);
>> + if (IS_ERR(ctx->base))
>> + return PTR_ERR(ctx->base);
>> +
>> + ctx->irq = platform_get_irq(pdev, 0);
>> + if (ctx->irq < 0) {
>> + dev_err(dev, "failed to get irq\n");
>> + return -ENODEV;
>> + }
>> +
>> + ret = devm_request_irq(dev, ctx->irq,
>> + qcom_iommu_fault,
>> + IRQF_SHARED,
>> + "qcom-iommu-fault",
>> + ctx);
>> + if (ret) {
>> + dev_err(dev, "failed to request IRQ %u\n", ctx->irq);
>> + return ret;
>> + }
>> +
>> + /* read the "reg" property directly to get the relative address
>> + * of the context bank, and calculate the asid from that:
>> + */
>> + if (of_property_read_u32_index(dev->of_node, "reg", 0, ®)) {
>> + dev_err(dev, "missing reg property\n");
>> + return -ENODEV;
>> + }
>> +
>> + ctx->asid = reg / 0x1000; /* context banks are 0x1000 apart
>> */
>> +
>> + dev_dbg(dev, "found asid %u\n", ctx->asid);
>> +
>> + list_add_tail(&ctx->node, &qcom_iommu->context_list);
>> +
>> + return 0;
>> +}
>> +
>> +static int qcom_iommu_ctx_remove(struct platform_device *pdev)
>> +{
>> + struct qcom_iommu_ctx *ctx = platform_get_drvdata(pdev);
>> +
>> + iommu_group_put(ctx->group);
>> + platform_set_drvdata(pdev, NULL);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct of_device_id ctx_of_match[] = {
>> + { .compatible = "qcom,msm-iommu-v1-ns" },
>> + { .compatible = "qcom,msm-iommu-v1-sec" },
>> + { /* sentinel */ }
>> +};
>> +
>> +static struct platform_driver qcom_iommu_ctx_driver = {
>> + .driver = {
>> + .name = "qcom-iommu-ctx",
>> + .of_match_table = of_match_ptr(ctx_of_match),
>> + },
>> + .probe = qcom_iommu_ctx_probe,
>> + .remove = qcom_iommu_ctx_remove,
>> +};
>> +module_platform_driver(qcom_iommu_ctx_driver);
>> +
>> +static int qcom_iommu_device_probe(struct platform_device *pdev)
>> +{
>> + struct qcom_iommu_dev *qcom_iommu;
>> + struct device *dev = &pdev->dev;
>> + struct resource *res;
>> + int ret;
>> +
>> + qcom_iommu = devm_kzalloc(dev, sizeof(*qcom_iommu), GFP_KERNEL);
>> + if (!qcom_iommu)
>> + return -ENOMEM;
>> + qcom_iommu->dev = dev;
>> +
>> + INIT_LIST_HEAD(&qcom_iommu->context_list);
>> +
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + if (res)
>> + qcom_iommu->local_base = devm_ioremap_resource(dev, res);
>> +
>> + qcom_iommu->iface_clk = devm_clk_get(dev, "iface");
>> + if (IS_ERR(qcom_iommu->iface_clk)) {
>> + dev_err(dev, "failed to get iface clock\n");
>> + return PTR_ERR(qcom_iommu->iface_clk);
>> + }
>> +
>> + qcom_iommu->bus_clk = devm_clk_get(dev, "bus");
>> + if (IS_ERR(qcom_iommu->bus_clk)) {
>> + dev_err(dev, "failed to get bus clock\n");
>> + return PTR_ERR(qcom_iommu->bus_clk);
>> + }
>> +
>> + if (of_property_read_u32(dev->of_node, "qcom,iommu-secure-id",
>> + &qcom_iommu->sec_id)) {
>> + dev_err(dev, "missing qcom,iommu-secure-id property\n");
>> + return -ENODEV;
>> + }
>> +
>> + platform_set_drvdata(pdev, qcom_iommu);
>> +
>> + /* register context bank devices, which are child nodes: */
>> + ret = of_platform_populate(dev->of_node, ctx_of_match, NULL, dev);
>> + if (ret) {
>> + dev_err(dev, "Failed to populate iommu contexts\n");
>> + return ret;
>> + }
>> +
>> + ret = iommu_device_sysfs_add(&qcom_iommu->iommu, dev, NULL,
>> + "smmu.%pa", &res->start);
>> + if (ret) {
>> + dev_err(dev, "Failed to register iommu in sysfs\n");
>> + return ret;
>> + }
>> +
>> + iommu_device_set_ops(&qcom_iommu->iommu, &qcom_iommu_ops);
>> + iommu_device_set_fwnode(&qcom_iommu->iommu, dev->fwnode);
>> +
>> + ret = iommu_device_register(&qcom_iommu->iommu);
>> + if (ret) {
>> + dev_err(dev, "Failed to register iommu\n");
>> + return ret;
>> + }
>> +
>> + pm_runtime_enable(dev);
>> + bus_set_iommu(&platform_bus_type, &qcom_iommu_ops);
>> +
>> + if (qcom_iommu->local_base) {
>> + pm_runtime_get_sync(dev);
>> + writel_relaxed(0xffffffff, qcom_iommu->local_base +
>> SMMU_INTR_SEL_NS);
>> + pm_runtime_put_sync(dev);
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int qcom_iommu_device_remove(struct platform_device *pdev)
>> +{
>> + pm_runtime_force_suspend(&pdev->dev);
>> + platform_set_drvdata(pdev, NULL);
>> +
>> + return 0;
>> +}
>> +
>> +#ifdef CONFIG_PM
>> +static int qcom_iommu_resume(struct device *dev)
>> +{
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct qcom_iommu_dev *qcom_iommu = platform_get_drvdata(pdev);
>> +
>> + return qcom_iommu_enable_clocks(qcom_iommu);
>> +}
>> +
>> +static int qcom_iommu_suspend(struct device *dev)
>> +{
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct qcom_iommu_dev *qcom_iommu = platform_get_drvdata(pdev);
>> +
>> + qcom_iommu_disable_clocks(qcom_iommu);
>> +
>> + return 0;
>> +}
>> +#endif
>> +
>> +static const struct dev_pm_ops qcom_iommu_pm_ops = {
>> + SET_RUNTIME_PM_OPS(qcom_iommu_suspend, qcom_iommu_resume, NULL)
>> + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
>> + pm_runtime_force_resume)
>> +};
>> +
>> +static const struct of_device_id qcom_iommu_of_match[] = {
>> + { .compatible = "qcom,msm-iommu-v1" },
>> + { /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(of, qcom_iommu_of_match);
>> +
>> +static struct platform_driver qcom_iommu_driver = {
>> + .driver = {
>> + .name = "qcom-iommu",
>> + .of_match_table = of_match_ptr(qcom_iommu_of_match),
>> + .pm = &qcom_iommu_pm_ops,
>> + },
>> + .probe = qcom_iommu_device_probe,
>> + .remove = qcom_iommu_device_remove,
>> +};
>> +module_platform_driver(qcom_iommu_driver);
>> +
>> +IOMMU_OF_DECLARE(qcom_iommu_dev, "qcom,msm-iommu-v1", NULL);
>> +
>> +MODULE_DESCRIPTION("IOMMU API for QCOM IOMMU v1 implementations");
>> +MODULE_LICENSE("GPL v2");
>>
>
> --
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
> a Linux Foundation Collaborative Project
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