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

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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>
This commit is contained in:
Mukesh Ojha 2026-01-05 18:52:58 +05:30 • committed by Bjorn Andersson
parent 223a871680
commit b019925838
1 changed files with 31 additions and 1 deletions
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32
drivers/firmware/qcom/qcom_scm.c
View file

@ -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;
}