firmware: qcom_scm: Add SHM bridge handling for PAS when running without QHEE

On SoCs running with a non-Gunyah-based hypervisor, Linux must take
responsibility for creating the SHM bridge both for metadata (before
calling qcom_scm_pas_init_image()) and for remoteproc memory (before
calling qcom_scm_pas_auth_and_reset()). We have taken care the things
required for qcom_scm_pas_auth_and_reset(). Lets put these awareness
of above conditions into qcom_scm_pas_init_image() and
qcom_scm_pas_metadata_release().

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260105-kvmrprocv10-v10-10-022e96815380@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

1 files changed, 31 insertions, 1 deletions

diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
index bc3b8dc7d3e4..4ce892d8fb25 100644
--- a/drivers/firmware/qcom/qcom_scm.c
+++ b/drivers/firmware/qcom/qcom_scm.c
@@ -623,6 +623,30 @@ disable_clk:
 	return ret;
 }
 
+static int qcom_scm_pas_prep_and_init_image(struct qcom_scm_pas_context *ctx,
+					    const void *metadata, size_t size)
+{
+	struct qcom_scm_res res;
+	phys_addr_t mdata_phys;
+	void *mdata_buf;
+	int ret;
+
+	mdata_buf = qcom_tzmem_alloc(__scm->mempool, size, GFP_KERNEL);
+	if (!mdata_buf)
+		return -ENOMEM;
+
+	memcpy(mdata_buf, metadata, size);
+	mdata_phys = qcom_tzmem_to_phys(mdata_buf);
+
+	ret = __qcom_scm_pas_init_image(ctx->pas_id, mdata_phys, &res);
+	if (ret < 0)
+		qcom_tzmem_free(mdata_buf);
+	else
+		ctx->ptr = mdata_buf;
+
+	return ret ? : res.result[0];
+}
+
 /**
  * qcom_scm_pas_init_image() - Initialize peripheral authentication service
  *			       state machine for a given peripheral, using the
@@ -648,6 +672,9 @@ int qcom_scm_pas_init_image(u32 pas_id, const void *metadata, size_t size,
 	void *mdata_buf;
 	int ret;
 
+	if (ctx && ctx->use_tzmem)
+		return qcom_scm_pas_prep_and_init_image(ctx, metadata, size);
+
 	/*
 	 * During the scm call memory protection will be enabled for the meta
 	 * data blob, so make sure it's physically contiguous, 4K aligned and
@@ -689,7 +716,10 @@ void qcom_scm_pas_metadata_release(struct qcom_scm_pas_context *ctx)
 	if (!ctx->ptr)
 		return;
 
-	dma_free_coherent(__scm->dev, ctx->size, ctx->ptr, ctx->phys);
+	if (ctx->use_tzmem)
+		qcom_tzmem_free(ctx->ptr);
+	else
+		dma_free_coherent(__scm->dev, ctx->size, ctx->ptr, ctx->phys);
 
 	ctx->ptr = NULL;
 }