linux-kernel - [PATCH 4/6] misc: fastrpc: support complete DMA pool access to the DSP

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Message-Id: <20240705074045.418836-6-srinivas.kandagatla@linaro.org>
Date: Fri,  5 Jul 2024 08:40:43 +0100
From: srinivas.kandagatla@...aro.org
To: gregkh@...uxfoundation.org
Cc: linux-kernel@...r.kernel.org,
	Dylan Van Assche <me@...anvanassche.be>,
	Caleb Connolly <caleb.connolly@...aro.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Ekansh Gupta <quic_ekangupt@...cinc.com>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 4/6] misc: fastrpc: support complete DMA pool access to the DSP

From: Dylan Van Assche <me@...anvanassche.be>

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@...anvanassche.be>
Reviewed-by: Caleb Connolly <caleb.connolly@...aro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Reviewed-by: Ekansh Gupta <quic_ekangupt@...cinc.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/misc/fastrpc.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 5fb302b8ae5d..1c045f9a75a4 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -2250,6 +2250,8 @@ 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);
@@ -2292,6 +2294,23 @@ 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) {
+		u64 src_perms;
+
+		rmem = of_reserved_mem_lookup(rmem_node);
+		if (!rmem) {
+			err = -EINVAL;
+			goto fdev_error;
+		}
+
+		src_perms = BIT(QCOM_SCM_VMID_HLOS);
+
+		qcom_scm_assign_mem(rmem->base, rmem->size, &src_perms,
+				    data->vmperms, data->vmcount);
+
+	}
+
 	secure_dsp = !(of_property_read_bool(rdev->of_node, "qcom,non-secure-domain"));
 	data->secure = secure_dsp;
 
-- 
2.25.1