Merge changes from topic "mb/drtm-work-phase-1" into integration

* changes:
  build(changelog): add new scope for Arm SMMU driver
  feat(smmu): add SMMU abort transaction function
  docs(build): add build option for DRTM support
  build(drtm): add DRTM support build option

6 files changed, 55 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index b42bdc537..05d97b006 100644
--- a/Makefile
+++ b/Makefile
@@ -833,6 +833,10 @@ ifeq (${CTX_INCLUDE_FPREGS},1)
     endif
 endif
 
+ifeq ($(DRTM_SUPPORT),1)
+    $(info DRTM_SUPPORT is an experimental feature)
+endif
+
 ################################################################################
 # Process platform overrideable behaviour
 ################################################################################
@@ -1008,6 +1012,7 @@ $(eval $(call assert_booleans,\
         HW_ASSISTED_COHERENCY \
         INVERTED_MEMMAP \
         MEASURED_BOOT \
+        DRTM_SUPPORT \
         NS_TIMER_SWITCH \
         OVERRIDE_LIBC \
         PL011_GENERIC_UART \
@@ -1144,6 +1149,7 @@ $(eval $(call add_defines,\
         HW_ASSISTED_COHERENCY \
         LOG_LEVEL \
         MEASURED_BOOT \
+        DRTM_SUPPORT \
         NS_TIMER_SWITCH \
         PL011_GENERIC_UART \
         PLAT_${PLAT} \
diff --git a/changelog.yaml b/changelog.yaml
index cc8137111..e2184e461 100644
--- a/changelog.yaml
+++ b/changelog.yaml
@@ -645,6 +645,9 @@ subsections:
                   - title: GIC-600AE
                     scope: gic600ae
 
+          - title: SMMU
+            scope: smmu
+
           - title: TZC
             scope: tzc
 
diff --git a/docs/getting_started/build-options.rst b/docs/getting_started/build-options.rst
index 742b6b589..be50e5edf 100644
--- a/docs/getting_started/build-options.rst
+++ b/docs/getting_started/build-options.rst
@@ -649,6 +649,15 @@ Common build options
 
    This option defaults to 0.
 
+-  ``DRTM_SUPPORT``: Boolean flag to enable support for Dynamic Root of Trust
+   for Measurement (DRTM). This feature has trust dependency on BL31 for taking
+   the measurements and recording them as per `PSA DRTM specification`_. For
+   platforms which use BL2 to load/authenticate BL31 ``TRUSTED_BOARD_BOOT`` can
+   be used and for the platforms which use ``RESET_TO_BL31`` platform owners
+   should have mechanism to authenticate BL31.
+
+   This option defaults to 0.
+
 -  ``NON_TRUSTED_WORLD_KEY``: This option is used when ``GENERATE_COT=1``. It
    specifies the file that contains the Non-Trusted World private key in PEM
    format. If ``SAVE_KEYS=1``, this file name will be used to save the key.
@@ -1116,3 +1125,4 @@ Firmware update options
 
 .. _DEN0115: https://developer.arm.com/docs/den0115/latest
 .. _PSA FW update specification: https://developer.arm.com/documentation/den0118/a/
+.. _PSA DRTM specification: https://developer.arm.com/documentation/den0113/a
diff --git a/drivers/arm/smmu/smmu_v3.c b/drivers/arm/smmu/smmu_v3.c
index 45f6df9f1..6c6f978d4 100644
--- a/drivers/arm/smmu/smmu_v3.c
+++ b/drivers/arm/smmu/smmu_v3.c
@@ -14,7 +14,7 @@
 /* SMMU poll number of retries */
 #define SMMU_POLL_TIMEOUT_US	U(1000)
 
-static int __init smmuv3_poll(uintptr_t smmu_reg, uint32_t mask,
+static int smmuv3_poll(uintptr_t smmu_reg, uint32_t mask,
 				uint32_t value)
 {
 	uint32_t reg_val;
@@ -155,3 +155,28 @@ int __init smmuv3_init(uintptr_t smmu_base)
 	return smmuv3_poll(smmu_base + SMMU_S_INIT,
 				SMMU_S_INIT_INV_ALL, 0U);
 }
+
+int smmuv3_ns_set_abort_all(uintptr_t smmu_base)
+{
+	/* Attribute update has completed when SMMU_GBPA.Update bit is 0 */
+	if (smmuv3_poll(smmu_base + SMMU_GBPA, SMMU_GBPA_UPDATE, 0U) != 0U) {
+		return -1;
+	}
+
+	/*
+	 * Set GBPA's ABORT bit. Other GBPA fields are presumably ignored then,
+	 * so simply preserve their value.
+	 */
+	mmio_setbits_32(smmu_base + SMMU_GBPA, SMMU_GBPA_UPDATE | SMMU_GBPA_ABORT);
+	if (smmuv3_poll(smmu_base + SMMU_GBPA, SMMU_GBPA_UPDATE, 0U) != 0U) {
+		return -1;
+	}
+
+	/* Disable the SMMU to engage the GBPA fields previously configured. */
+	mmio_clrbits_32(smmu_base + SMMU_CR0, SMMU_CR0_SMMUEN);
+	if (smmuv3_poll(smmu_base + SMMU_CR0ACK, SMMU_CR0_SMMUEN, 0U) != 0U) {
+		return -1;
+	}
+
+	return 0;
+}
diff --git a/include/drivers/arm/smmu_v3.h b/include/drivers/arm/smmu_v3.h
index e60c75445..37da56f6e 100644
--- a/include/drivers/arm/smmu_v3.h
+++ b/include/drivers/arm/smmu_v3.h
@@ -12,6 +12,8 @@
 #include <platform_def.h>
 
 /* SMMUv3 register offsets from device base */
+#define SMMU_CR0	U(0x0020)
+#define SMMU_CR0ACK	U(0x0024)
 #define SMMU_GBPA	U(0x0044)
 #define SMMU_S_IDR1	U(0x8004)
 #define SMMU_S_INIT	U(0x803c)
@@ -37,6 +39,9 @@
 
 #endif /* ENABLE_RME */
 
+/* SMMU_CR0 and SMMU_CR0ACK register fields */
+#define SMMU_CR0_SMMUEN			(1UL << 0)
+
 /* SMMU_GBPA register fields */
 #define SMMU_GBPA_UPDATE		(1UL << 31)
 #define SMMU_GBPA_ABORT			(1UL << 20)
@@ -61,4 +66,6 @@
 int smmuv3_init(uintptr_t smmu_base);
 int smmuv3_security_init(uintptr_t smmu_base);
 
+int smmuv3_ns_set_abort_all(uintptr_t smmu_base);
+
 #endif /* SMMU_V3_H */
diff --git a/make_helpers/defaults.mk b/make_helpers/defaults.mk
index d5383a10f..fab6bf6da 100644
--- a/make_helpers/defaults.mk
+++ b/make_helpers/defaults.mk
@@ -463,3 +463,6 @@ TWED_DELAY			:= 0
 
 # By default, disable the mocking of RSS provided services
 PLAT_RSS_NOT_SUPPORTED		:= 0
+
+# Dynamic Root of Trust for Measurement support
+DRTM_SUPPORT			:= 0