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iommu/qcom: Initialize secure page table

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This basically gets the secure page table size, allocates memory for
secure pagetables and passes the physical address to the trusted zone.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Stanimir Varbanov 2017-08-09 10:43:05 -04:00 committed by Joerg Roedel
parent 0ae349a0f3
commit d051f28c88
1 changed files with 64 additions and 0 deletions
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64
drivers/iommu/qcom_iommu.c
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@ -604,6 +604,51 @@ static void qcom_iommu_disable_clocks(struct qcom_iommu_dev *qcom_iommu)
clk_disable_unprepare(qcom_iommu->iface_clk);
}
static int qcom_iommu_sec_ptbl_init(struct device *dev)
{
size_t psize = 0;
unsigned int spare = 0;
void *cpu_addr;
dma_addr_t paddr;
unsigned long attrs;
static bool allocated = false;
int ret;
if (allocated)
return 0;
ret = qcom_scm_iommu_secure_ptbl_size(spare, &psize);
if (ret) {
dev_err(dev, "failed to get iommu secure pgtable size (%d)\n",
ret);
return ret;
}
dev_info(dev, "iommu sec: pgtable size: %zu\n", psize);
attrs = DMA_ATTR_NO_KERNEL_MAPPING;
cpu_addr = dma_alloc_attrs(dev, psize, &paddr, GFP_KERNEL, attrs);
if (!cpu_addr) {
dev_err(dev, "failed to allocate %zu bytes for pgtable\n",
psize);
return -ENOMEM;
}
ret = qcom_scm_iommu_secure_ptbl_init(paddr, psize, spare);
if (ret) {
dev_err(dev, "failed to init iommu pgtable (%d)\n", ret);
goto free_mem;
}
allocated = true;
return 0;
free_mem:
dma_free_attrs(dev, psize, cpu_addr, paddr, attrs);
return ret;
}
static int get_asid(const struct device_node *np)
{
u32 reg;
@ -700,6 +745,17 @@ static struct platform_driver qcom_iommu_ctx_driver = {
.remove = qcom_iommu_ctx_remove,
};
static bool qcom_iommu_has_secure_context(struct qcom_iommu_dev *qcom_iommu)
{
struct device_node *child;
for_each_child_of_node(qcom_iommu->dev->of_node, child)
if (of_device_is_compatible(child, "qcom,msm-iommu-v1-sec"))
return true;
return false;
}
static int qcom_iommu_device_probe(struct platform_device *pdev)
{
struct device_node *child;
@ -744,6 +800,14 @@ static int qcom_iommu_device_probe(struct platform_device *pdev)
return -ENODEV;
}
if (qcom_iommu_has_secure_context(qcom_iommu)) {
ret = qcom_iommu_sec_ptbl_init(dev);
if (ret) {
dev_err(dev, "cannot init secure pg table(%d)\n", ret);
return ret;
}
}
platform_set_drvdata(pdev, qcom_iommu);
pm_runtime_enable(dev);