On 5/24/2024 9:44 PM, Dylan Van Assche wrote:
> 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@xxxxxxxxxxxxxxxxx>
> Reviewed-by: Caleb Connolly <caleb.connolly@xxxxxxxxxx>
> ---
Reviewed-by: Ekansh Gupta <quic_ekangupt@xxxxxxxxxxx>
> drivers/misc/fastrpc.c | 19 +++++++++++++++++++
> 1 file changed, 19 insertions(+)
>
> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
> index 4c67e2c5a82e..c06667b29055 100644
> --- a/drivers/misc/fastrpc.c
> +++ b/drivers/misc/fastrpc.c
> @@ -2255,6 +2255,8 @@ 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);
> @@ -2297,6 +2299,23 @@ 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;
>
