diff mbox series

[v4,1/2] misc: fastrpc: support complete DMA pool access to the DSP

Message ID 20230511141146.30465-2-me@dylanvanassche.be
State Accepted
Commit c3c0363bc72d4d0907a6d446d7424b3f022ce82a
Headers show
Series misc: fastrpc: FastRPC reserved memory assignment for SDM845 SLPI | expand

Commit Message

Dylan Van Assche May 11, 2023, 2:11 p.m. UTC 
To support FastRPC Context Banks which aren't mapped via the SMMU,
make the whole reserved memory region available to the DSP to allow
access to coherent buffers.

This is performed by assigning the memory to the DSP via a hypervisor
call to set the correct permissions for the Virtual Machines on the DSP.
This is only necessary when a memory region is provided for SLPI DSPs
so guard this with a domain ID check.

Signed-off-by: Dylan Van Assche <me@dylanvanassche.be>
Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>
---
 drivers/misc/fastrpc.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
diff mbox series

Patch

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index f48466960f1b..1ced553ae959 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -2231,6 +2231,8 @@  static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
 	int i, err, domain_id = -1, vmcount;
 	const char *domain;
 	bool secure_dsp;
+	struct device_node *rmem_node;
+	struct reserved_mem *rmem;
 	unsigned int vmids[FASTRPC_MAX_VMIDS];
 
 	err = of_property_read_string(rdev->of_node, "label", &domain);
@@ -2274,6 +2276,19 @@  static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
 		}
 	}
 
+	rmem_node = of_parse_phandle(rdev->of_node, "memory-region", 0);
+	if (domain_id == SDSP_DOMAIN_ID && rmem_node) {
+		rmem = of_reserved_mem_lookup(rmem_node);
+		if (!rmem) {
+			err = -EINVAL;
+			goto fdev_error;
+		}
+
+		qcom_scm_assign_mem(rmem->base, rmem->size, &data->perms,
+				    data->vmperms, data->vmcount);
+
+	}
+
 	secure_dsp = !(of_property_read_bool(rdev->of_node, "qcom,non-secure-domain"));
 	data->secure = secure_dsp;