[PATCH RFC v2 1/8] tee: optee: allow RPMI transport builds on RISC-V

[Amirreza Zarrabi]

Allow the TEE subsystem and OP-TEE driver to be selected on RISC-V
systems with the RPMI TEE transport enabled. Prevent OP-TEE from being
built in when the transport is modular.

Common OP-TEE code checks the memory type when registering shared
memory. Add the RISC-V implementation so that code builds without
reaching the unsupported-architecture error. Reject mappings with
explicit non-cacheable or I/O memory types.

Signed-off-by: Amirreza Zarrabi <amirreza.zarrabi@xxxxxxxxxxxxxxxx>
---
 drivers/tee/Kconfig       | 3 ++-
 drivers/tee/optee/Kconfig | 3 ++-
 drivers/tee/optee/call.c  | 2 ++
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/tee/Kconfig b/drivers/tee/Kconfig
index 98c3ad083940..ad754b647a3c 100644
--- a/drivers/tee/Kconfig
+++ b/drivers/tee/Kconfig
@@ -2,7 +2,8 @@
 # Generic Trusted Execution Environment Configuration
 menuconfig TEE
 	tristate "Trusted Execution Environment support"
-	depends on HAVE_ARM_SMCCC || COMPILE_TEST || CPU_SUP_AMD
+	depends on HAVE_ARM_SMCCC || COMPILE_TEST || CPU_SUP_AMD || \
+		   RISCV_RPMI_TEE_TRANSPORT
 	select CRYPTO_LIB_SHA1
 	select DMA_SHARED_BUFFER
 	select GENERIC_ALLOCATOR
diff --git a/drivers/tee/optee/Kconfig b/drivers/tee/optee/Kconfig
index 891dac63cab8..cc057c76de62 100644
--- a/drivers/tee/optee/Kconfig
+++ b/drivers/tee/optee/Kconfig
@@ -2,10 +2,11 @@
 # OP-TEE Trusted Execution Environment Configuration
 config OPTEE
 	tristate "OP-TEE"
-	depends on HAVE_ARM_SMCCC
+	depends on HAVE_ARM_SMCCC || RISCV_RPMI_TEE_TRANSPORT
 	depends on MMU
 	depends on RPMB || !RPMB
 	depends on ARM_FFA_TRANSPORT || !ARM_FFA_TRANSPORT
+	depends on RISCV_RPMI_TEE_TRANSPORT || !RISCV_RPMI_TEE_TRANSPORT
 	help
 	  This implements the OP-TEE Trusted Execution Environment (TEE)
 	  driver.
diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
index e046aff61828..267513cf4ec0 100644
--- a/drivers/tee/optee/call.c
+++ b/drivers/tee/optee/call.c
@@ -604,6 +604,8 @@ static bool is_normal_memory(pgprot_t p)
 #elif defined(CONFIG_ARM64)
 	return ((pgprot_val(p) & PTE_ATTRINDX_MASK) == PTE_ATTRINDX(MT_NORMAL)) ||
 	       ((pgprot_val(p) & PTE_ATTRINDX_MASK) == PTE_ATTRINDX(MT_NORMAL_TAGGED));
+#elif defined(CONFIG_RISCV)
+	return !(pgprot_val(p) & _PAGE_MTMASK);
 #else
 #error "Unsupported architecture"
 #endif

-- 
2.34.1