From: Dylan Van Assche Date: Fri, 5 Jul 2024 07:58:58 +0000 (+0100) Subject: misc: fastrpc: support complete DMA pool access to the DSP X-Git-Tag: v6.11-rc1~100^2~16 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c3c0363bc72d4d0907a6d446d7424b3f022ce82a;p=thirdparty%2Flinux.git misc: fastrpc: support complete DMA pool access to the DSP 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 Reviewed-by: Caleb Connolly Reviewed-by: Dmitry Baryshkov Reviewed-by: Ekansh Gupta Signed-off-by: Srinivas Kandagatla Link: https://lore.kernel.org/r/20240705075900.424100-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index 5fb302b8ae5d6..1c045f9a75a4c 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;