feat(tc): get the parent component provided DPE context_handle
Each client who wants to communicate with the DPE service
must own a valid context handle issued by the DPE service.
A context handle can be used for a single time then it will
be invalidated by the DPE service. In case of calls from
the same component, the next valid context handle is
returned in the response to a DPE command. When a component
finishes their job then the next component in the boot flow
inherits its first context handle from its parent.
How the inheritance is done can be client or
platform-dependent. It can be shared through shared
memory or be part of a DTB object passed to the next
bootloader stage.
Signed-off-by: Tamas Ban <tamas.ban@arm.com>
Signed-off-by: David Vincze <david.vincze@arm.com>
Change-Id: Ic82f074f1c5b15953e78f9fa5404ed7f48674cbb
diff --git a/plat/arm/board/tc/tc_bl1_dpe.c b/plat/arm/board/tc/tc_bl1_dpe.c
index 25fdf95..c206b55 100644
--- a/plat/arm/board/tc/tc_bl1_dpe.c
+++ b/plat/arm/board/tc/tc_bl1_dpe.c
@@ -7,7 +7,10 @@
#include <stdint.h>
#include <common/debug.h>
+#include <drivers/arm/css/sds.h>
#include <drivers/arm/rss_comms.h>
+#include <drivers/delay_timer.h>
+#include <drivers/generic_delay_timer.h>
#include <drivers/measured_boot/metadata.h>
#include <drivers/measured_boot/rss/dice_prot_env.h>
#include <plat/arm/common/plat_arm.h>
@@ -44,6 +47,10 @@
.id = DPE_INVALID_ID }
};
+/* Effective timeout of 10000 ms */
+#define RSS_DPE_BOOT_10US_RETRIES 1000000
+#define TC2_SDS_DPE_CTX_HANDLE_STRUCT_ID 0x0000000A
+
/* Context handle is meant to be used by BL2. Sharing it via TB_FW_CONFIG */
static int new_ctx_handle;
@@ -52,6 +59,53 @@
new_ctx_handle = *ctx_handle;
}
+void plat_dpe_get_context_handle(int *ctx_handle)
+{
+ int retry = RSS_DPE_BOOT_10US_RETRIES;
+ int ret;
+
+ /* Initialize System level generic or SP804 timer */
+ generic_delay_timer_init();
+
+ /* Check the initialization of the Shared Data Storage area between RSS
+ * and AP. Since AP_BL1 is executed first then a bit later the RSS
+ * runtime, which initialize this area, therefore AP needs to check it
+ * in a loop until it gets written by RSS Secure Runtime.
+ */
+ VERBOSE("Waiting for DPE service initialization in RSS Secure Runtime\n");
+ while (retry > 0) {
+ ret = sds_init(SDS_RSS_AP_REGION_ID);
+ if (ret != SDS_OK) {
+ udelay(10);
+ retry--;
+ } else {
+ break;
+ }
+ }
+
+ if (retry == 0) {
+ ERROR("DPE init timeout\n");
+ plat_panic_handler();
+ } else {
+ VERBOSE("DPE init succeeded in %dms.\n",
+ (RSS_DPE_BOOT_10US_RETRIES - retry) / 100);
+ }
+
+ /* TODO: call this in a loop to avoid reading unfinished data */
+ ret = sds_struct_read(SDS_RSS_AP_REGION_ID,
+ TC2_SDS_DPE_CTX_HANDLE_STRUCT_ID,
+ 0,
+ ctx_handle,
+ sizeof(*ctx_handle),
+ SDS_ACCESS_MODE_NON_CACHED);
+ if (ret != SDS_OK) {
+ ERROR("Unable to get DPE context handle from SDS area\n");
+ plat_panic_handler();
+ }
+
+ VERBOSE("Received DPE context handle: 0x%x\n", *ctx_handle);
+}
+
void bl1_plat_mboot_init(void)
{
/* Initialize the communication channel between AP and RSS */