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iommu: qcom-smmu: handle running in el2

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We only need to configure the SMMU when running in EL1. In EL2 the
hypervisor isn't running so peripherals can just do DMA as they wish.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
This commit is contained in:
Caleb Connolly 2024-11-13 06:09:24 +01:00
parent 53c0f1beac
commit e55fc3ab20
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GPG Key ID: 7930459FB9303217
1 changed files with 7 additions and 0 deletions
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7
drivers/iommu/qcom-hyp-smmu.c
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@ -91,6 +91,8 @@ struct qcom_smmu_priv {
phys_addr_t base;
struct list_head devices;
struct udevice *dev;
/* SMMU is not needed when running in EL2 */
bool disable;
/* Read-once config */
int num_cb;
@ -277,6 +279,9 @@ static int qcom_smmu_connect(struct udevice *dev)
if (WARN_ON(!priv))
return -EINVAL;
if (priv->disable)
return 0;
mdev = alloc_dev(dev);
if (IS_ERR(mdev) && PTR_ERR(mdev) != -EEXIST) {
printf("%s: %s Couldn't create mmu context\n", __func__,
@ -348,6 +353,8 @@ static int qcom_smmu_probe(struct udevice *dev)
priv->base = dev_read_addr(dev);
INIT_LIST_HEAD(&priv->devices);
priv->disable = current_el() > 1;
/* Read SMMU config */
val = gr0_readl(priv, ARM_SMMU_GR0_ID0);
priv->num_smr = FIELD_GET(ARM_SMMU_ID0_NUMSMRG, val);