firmware: qcom_scm: Add qcom_scm_pas_get_rsc_table() to get resource table

Qualcomm remote processor may rely on Static and Dynamic resources for
it to be functional. Static resources are fixed like for example,
memory-mapped addresses required by the subsystem and dynamic
resources, such as shared memory in DDR etc., are determined at
runtime during the boot process.

For most of the Qualcomm SoCs, when run with Gunyah or older QHEE
hypervisor, all the resources whether it is static or dynamic, is
managed by the hypervisor. Dynamic resources if it is present for a
remote processor will always be coming from secure world via SMC call
while static resources may be present in remote processor firmware
binary or it may be coming qcom_scm_pas_get_rsc_table() SMC call along
with dynamic resources.

Some of the remote processor drivers, such as video, GPU, IPA, etc., do
not check whether resources are present in their remote processor
firmware binary. In such cases, the caller of this function should set
input_rt and input_rt_size as NULL and zero respectively. Remoteproc
framework has method to check whether firmware binary contain resources
or not and they should be pass resource table pointer to input_rt and
resource table size to input_rt_size and this will be forwarded to
TrustZone for authentication. TrustZone will then append the dynamic
resources and return the complete resource table in the passed output
buffer.

More about documentation on resource table format can be found in
include/linux/remoteproc.h

Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260105-kvmrprocv10-v10-11-022e96815380@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/firmware/qcom/qcom_scm.h b/include/linux/firmware/qcom/qcom_scm.h
index d6d83888bb75..5747bd191bf1 100644
--- a/include/linux/firmware/qcom/qcom_scm.h
+++ b/include/linux/firmware/qcom/qcom_scm.h
@@ -88,6 +88,10 @@ int qcom_scm_pas_mem_setup(u32 pas_id, phys_addr_t addr, phys_addr_t size);
 int qcom_scm_pas_auth_and_reset(u32 pas_id);
 int qcom_scm_pas_shutdown(u32 pas_id);
 bool qcom_scm_pas_supported(u32 pas_id);
+struct resource_table *qcom_scm_pas_get_rsc_table(struct qcom_scm_pas_context *ctx,
+						  void *input_rt, size_t input_rt_size,
+						  size_t *output_rt_size);
+
 int qcom_scm_pas_prepare_and_auth_reset(struct qcom_scm_pas_context *ctx);
 
 int qcom_scm_io_readl(phys_addr_t addr, unsigned int *val);