firmware: qcom: scm: make qcom_scm_lmh_dcvsh() use the TZ allocator

Let's use the new TZ memory allocator to obtain a buffer for this call
instead of using dma_alloc_coherent().

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Andrew Halaney <ahalaney@redhat.com>
Tested-by: Andrew Halaney <ahalaney@redhat.com> # sc8280xp-lenovo-thinkpad-x13s
Tested-by: Deepti Jaggi <quic_djaggi@quicinc.com> #sa8775p-ride
Reviewed-by: Elliot Berman <quic_eberman@quicinc.com>
Link: https://lore.kernel.org/r/20240527-shm-bridge-v10-7-ce7afaa58d3a@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

drivers/firmware/qcom/qcom_scm.c

@@ -1360,8 +1360,6 @@ EXPORT_SYMBOL_GPL(qcom_scm_lmh_profile_change);
 int qcom_scm_lmh_dcvsh(u32 payload_fn, u32 payload_reg, u32 payload_val,
 		       u64 limit_node, u32 node_id, u64 version)
 {
-	dma_addr_t payload_phys;
-	u32 *payload_buf;
 	int ret, payload_size = 5 * sizeof(u32);
 
 	struct qcom_scm_desc desc = {
@@ -1376,7 +1374,9 @@ int qcom_scm_lmh_dcvsh(u32 payload_fn, u32 payload_reg, u32 payload_val,
 		.owner = ARM_SMCCC_OWNER_SIP,
 	};
 
-	payload_buf = dma_alloc_coherent(__scm->dev, payload_size, &payload_phys, GFP_KERNEL);
+	u32 *payload_buf __free(qcom_tzmem) = qcom_tzmem_alloc(__scm->mempool,
+							       payload_size,
+							       GFP_KERNEL);
 	if (!payload_buf)
 		return -ENOMEM;
 
@@ -1386,11 +1386,10 @@ int qcom_scm_lmh_dcvsh(u32 payload_fn, u32 payload_reg, u32 payload_val,
 	payload_buf[3] = 1;
 	payload_buf[4] = payload_val;
 
-	desc.args[0] = payload_phys;
+	desc.args[0] = qcom_tzmem_to_phys(payload_buf);
 
 	ret = qcom_scm_call(__scm->dev, &desc, NULL);
 
-	dma_free_coherent(__scm->dev, payload_size, payload_buf, payload_phys);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(qcom_scm_lmh_dcvsh);