From: Caleb Connolly <caleb.connolly@linaro.org>
Date: Wed, 13 Nov 2024 05:09:24 +0000 (+0100)
Subject: iommu: qcom-smmu: handle running in el2
X-Git-Url: http://git.dujemihanovic.xyz/img/static/%7B%7B%20%24.Site.BaseURL%20%7D%7Dposts/%7B%7B?a=commitdiff_plain;h=e55fc3ab205c6e81ac52fe2550478ea746d9b512;p=u-boot.git

iommu: qcom-smmu: handle running in el2

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>
---

diff --git a/drivers/iommu/qcom-hyp-smmu.c b/drivers/iommu/qcom-hyp-smmu.c
index 7e07487ad3..c1b95bc8b8 100644
--- a/drivers/iommu/qcom-hyp-smmu.c
+++ b/drivers/iommu/qcom-hyp-smmu.c
@@ -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);