fdtdec: optionally add property no-map to created reserved memory node

Add boolean input argument @no_map to helper function
fdtdec_add_reserved_memory() to add or not "no-map" property
for an added reserved memory node.

Property no-map is used by the Linux kernel to not not map memory
in its static memory mapping. It is needed for example for the|
consistency of system non-cached memory and to prevent speculative
accesses to some firewalled memory.

No functional change. A later change will update to OPTEE library to
add no-map property to OP-TEE reserved memory nodes.

Signed-off-by: Etienne Carriere <etienne.carriere@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/arch/riscv/lib/fdt_fixup.c b/arch/riscv/lib/fdt_fixup.c
index 5b24202..d02062f 100644 (file)
--- a/arch/riscv/lib/fdt_fixup.c
+++ b/arch/riscv/lib/fdt_fixup.c
@@ -75,7 +75,7 @@ int riscv_fdt_copy_resv_mem_node(const void *src, void *dst)
                pmp_mem.start = addr;
                pmp_mem.end = addr + size - 1;
                err = fdtdec_add_reserved_memory(dst, basename, &pmp_mem,
-                                                &phandle);
+                                                &phandle, false);
                if (err < 0 && err != -FDT_ERR_EXISTS) {
                        log_err("failed to add reserved memory: %d\n", err);
                        return err;

diff --git a/include/fdtdec.h b/include/fdtdec.h
index 152eb07..62d1660 100644 (file)
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -1029,7 +1029,7 @@ static inline int fdtdec_set_phandle(void *blob, int node, uint32_t phandle)
  *     };
  *     uint32_t phandle;
  *
- *     fdtdec_add_reserved_memory(fdt, "framebuffer", &fb, &phandle);
+ *     fdtdec_add_reserved_memory(fdt, "framebuffer", &fb, &phandle, false);
  *
  * This results in the following subnode being added to the top-level
  * /reserved-memory node:
@@ -1056,11 +1056,12 @@ static inline int fdtdec_set_phandle(void *blob, int node, uint32_t phandle)
  * @param carveout     information about the carveout region
  * @param phandlep     return location for the phandle of the carveout region
  *                     can be NULL if no phandle should be added
+ * @param no_map       add "no-map" property if true
  * @return 0 on success or a negative error code on failure
  */
 int fdtdec_add_reserved_memory(void *blob, const char *basename,
                               const struct fdt_memory *carveout,
-                              uint32_t *phandlep);
+                              uint32_t *phandlep, bool no_map);
 
 /**
  * fdtdec_get_carveout() - reads a carveout from an FDT

diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 56bf9fc..b8fc5e2 100644 (file)
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -1316,7 +1316,7 @@ static int fdtdec_init_reserved_memory(void *blob)
 
 int fdtdec_add_reserved_memory(void *blob, const char *basename,
                               const struct fdt_memory *carveout,
-                              uint32_t *phandlep)
+                              uint32_t *phandlep, bool no_map)
 {
        fdt32_t cells[4] = {}, *ptr = cells;
        uint32_t upper, lower, phandle;
@@ -1416,6 +1416,12 @@ int fdtdec_add_reserved_memory(void *blob, const char *basename,
        if (err < 0)
                return err;
 
+       if (no_map) {
+               err = fdt_setprop(blob, node, "no-map", NULL, 0);
+               if (err < 0)
+                       return err;
+       }
+
        /* return the phandle for the new node for the caller to use */
        if (phandlep)
                *phandlep = phandle;
@@ -1481,7 +1487,7 @@ int fdtdec_set_carveout(void *blob, const char *node, const char *prop_name,
        fdt32_t value;
        void *prop;
 
-       err = fdtdec_add_reserved_memory(blob, name, carveout, &phandle);
+       err = fdtdec_add_reserved_memory(blob, name, carveout, &phandle, false);
        if (err < 0) {
                debug("failed to add reserved memory: %d\n", err);
                return err;

diff --git a/lib/optee/optee.c b/lib/optee/optee.c
index 457d4cc..963c2ff 100644 (file)
--- a/lib/optee/optee.c
+++ b/lib/optee/optee.c
@@ -192,7 +192,7 @@ int optee_copy_fdt_nodes(const void *old_blob, void *new_blob)
                                ret = fdtdec_add_reserved_memory(new_blob,
                                                                 nodename,
                                                                 &carveout,
-                                                                NULL);
+                                                                NULL, false);
                                free(oldname);
 
                                if (ret < 0)

diff --git a/test/dm/fdtdec.c b/test/dm/fdtdec.c
index 716993f..4119003 100644 (file)
--- a/test/dm/fdtdec.c
+++ b/test/dm/fdtdec.c
@@ -80,7 +80,7 @@ static int dm_test_fdtdec_add_reserved_memory(struct unit_test_state *uts)
        resv.start = 0x1000;
        resv.end = 0x1fff;
        ut_assertok(fdtdec_add_reserved_memory(blob, "rsvd_region",
-                                              &resv, &phandle));
+                                              &resv, &phandle, false));
 
        /* Test /reserve-memory and its subnode should exist */
        parent = fdt_path_offset(blob, "/reserved-memory");
@@ -101,7 +101,7 @@ static int dm_test_fdtdec_add_reserved_memory(struct unit_test_state *uts)
        resv.start = 0x2000;
        resv.end = 0x2fff;
        ut_assertok(fdtdec_add_reserved_memory(blob, "rsvd_region1",
-                                              &resv, &phandle1));
+                                              &resv, &phandle1, false));
        subnode = fdt_path_offset(blob, "/reserved-memory/rsvd_region1");
        ut_assert(subnode > 0);
 
@@ -115,7 +115,7 @@ static int dm_test_fdtdec_add_reserved_memory(struct unit_test_state *uts)
        resv.start = 0x1000;
        resv.end = 0x1fff;
        ut_assertok(fdtdec_add_reserved_memory(blob, "rsvd_region2",
-                                              &resv, &phandle1));
+                                              &resv, &phandle1, false));
        subnode = fdt_path_offset(blob, "/reserved-memory/rsvd_region2");
        ut_assert(subnode < 0);