SPMD: SPMC init, SMC handler cosmetic changes

Change-Id: I8881d489994aea667e3dd59932ab4123f511d6ba
Signed-off-by: Artsem Artsemenka <artsem.artsemenka@arm.com>
Signed-off-by: Max Shvetsov <maksims.svecovs@arm.com>

include/services/spmd_svc.h

@@ -11,7 +11,7 @@
 #include <services/spci_svc.h>
 #include <stdint.h>
 
-int32_t spmd_setup(void);
+int spmd_setup(void);
 uint64_t spmd_smc_handler(uint32_t smc_fid,
 			  uint64_t x1,
 			  uint64_t x2,

services/std_svc/spmd/spmd_main.c

@@ -33,7 +33,24 @@ spmd_spm_core_context_t spm_core_context[PLATFORM_CORE_COUNT];
 /*******************************************************************************
  * SPM Core attribute information read from its manifest.
  ******************************************************************************/
-spmc_manifest_sect_attribute_t spmc_attrs;
+static spmc_manifest_sect_attribute_t spmc_attrs;
+
+/*******************************************************************************
+ * SPM Core entry point information. Discovered on the primary core and reused
+ * on secondary cores.
+ ******************************************************************************/
+static entry_point_info_t *spmc_ep_info;
+
+/*******************************************************************************
+ * Static function declaration.
+ ******************************************************************************/
+static int32_t	spmd_init(void);
+static int	spmd_spmc_init(void *rd_base, size_t rd_size);
+static uint64_t	spmd_spci_error_return(void *handle, int error_code);
+static uint64_t	spmd_smc_forward(uint32_t smc_fid, uint32_t in_sstate,
+				 uint32_t out_sstate, uint64_t x1,
+				 uint64_t x2, uint64_t x3, uint64_t x4,
+				 void *handle);
 
 /*******************************************************************************
  * This function takes an SP context pointer and performs a synchronous entry
@@ -111,63 +128,21 @@ static int32_t spmd_init(void)
 }
 
 /*******************************************************************************
- * Initialize context of SPM core.
+ * Load SPMC manifest, init SPMC.
  ******************************************************************************/
-int32_t spmd_setup(void)
+static int spmd_spmc_init(void *rd_base, size_t rd_size)
 {
 	int rc;
-	void *rd_base;
-	size_t rd_size;
-	entry_point_info_t *spmc_ep_info;
-	uintptr_t rd_base_align;
-	uintptr_t rd_size_align;
 	uint32_t ep_attr;
-
-	spmc_ep_info = bl31_plat_get_next_image_ep_info(SECURE);
-	if (!spmc_ep_info) {
-		WARN("No SPM core image provided by BL2 boot loader, Booting "
-		     "device without SP initialization. SMC`s destined for SPM "
-		     "core will return SMC_UNK\n");
-		return 1;
-	}
-
-	/* Under no circumstances will this parameter be 0 */
-	assert(spmc_ep_info->pc != 0U);
-
-	/*
-	 * Check if BL32 ep_info has a reference to 'tos_fw_config'. This will
-	 * be used as a manifest for the SPM core at the next lower EL/mode.
-	 */
-	if (spmc_ep_info->args.arg0 == 0U || spmc_ep_info->args.arg2 == 0U) {
-		ERROR("Invalid or absent SPM core manifest\n");
-		panic();
-	}
-
-	/* Obtain whereabouts of SPM core manifest */
-	rd_base = (void *) spmc_ep_info->args.arg0;
-	rd_size = spmc_ep_info->args.arg2;
-
-	rd_base_align = page_align((uintptr_t) rd_base, DOWN);
-	rd_size_align = page_align((uintptr_t) rd_size, UP);
-
-	/* Map the manifest in the SPMD translation regime first */
-	VERBOSE("SPM core manifest base : 0x%lx\n", rd_base_align);
-	VERBOSE("SPM core manifest size : 0x%lx\n", rd_size_align);
-	rc = mmap_add_dynamic_region((unsigned long long) rd_base_align,
-				     (uintptr_t) rd_base_align,
-				     rd_size_align,
-				     MT_RO_DATA);
-	if (rc < 0) {
-		ERROR("Error while mapping SPM core manifest (%d).\n", rc);
-		panic();
-	}
+	unsigned int linear_id = plat_my_core_pos();
+	spmd_spm_core_context_t *spm_ctx = &spm_core_context[linear_id];
 
 	/* Load the SPM core manifest */
 	rc = plat_spm_core_manifest_load(&spmc_attrs, rd_base, rd_size);
-	if (rc < 0) {
+	if (rc != 0) {
 		WARN("No or invalid SPM core manifest image provided by BL2 "
 		     "boot loader. ");
-		goto error;
+		return 1;
 	}
 
 	/*
@@ -179,7 +154,7 @@ int32_t spmd_setup(void)
 		WARN("Unsupported SPCI version (%x.%x) specified in SPM core "
 		     "manifest image provided by BL2 boot loader.\n",
 		     spmc_attrs.major_version, spmc_attrs.minor_version);
-		goto error;
+		return 1;
 	}
 
 	INFO("SPCI version (%x.%x).\n", spmc_attrs.major_version,
@@ -191,7 +166,7 @@ int32_t spmd_setup(void)
 		WARN("Unsupported SPM core run time EL%x specified in "
 		     "manifest image provided by BL2 boot loader.\n",
 		     spmc_attrs.runtime_el);
-		goto error;
+		return 1;
 	}
 
 	INFO("SPM core run time EL%x.\n", spmc_attrs.runtime_el);
@@ -202,7 +177,7 @@ int32_t spmd_setup(void)
 		WARN("Unsupported SPM core execution state %x specified in "
 		     "manifest image provided by BL2 boot loader.\n",
 		     spmc_attrs.exec_state);
-		goto error;
+		return 1;
 	}
 
 	INFO("SPM core execution state %x.\n", spmc_attrs.exec_state);
@@ -213,7 +188,7 @@ int32_t spmd_setup(void)
 		WARN("Invalid combination of SPM core execution state (%x) "
 		     "and run time EL (%x).\n", spmc_attrs.exec_state,
 		     spmc_attrs.runtime_el);
-		goto error;
+		return 1;
 	}
 
 	/*
@@ -230,14 +205,16 @@ int32_t spmd_setup(void)
 			WARN("SPM core run time EL: S-EL%x is not supported "
 			     "but specified in manifest image provided by "
 			     "BL2 boot loader.\n", spmc_attrs.runtime_el);
-			goto error;
+			return 1;
 		}
 	}
 
 	/* Initialise an entrypoint to set up the CPU context */
 	ep_attr = SECURE | EP_ST_ENABLE;
-	if (read_sctlr_el3() & SCTLR_EE_BIT)
+	if (read_sctlr_el3() & SCTLR_EE_BIT) {
 		ep_attr |= EP_EE_BIG;
+	}
+
 	SET_PARAM_HEAD(spmc_ep_info, PARAM_EP, VERSION_1, ep_attr);
 	assert(spmc_ep_info->pc == BL32_BASE);
 
@@ -258,8 +235,10 @@ int32_t spmd_setup(void)
 	}
 
 	/* Initialise SPM core context with this entry point information */
-	cm_setup_context(&(spm_core_context[plat_my_core_pos()].cpu_ctx),
-			 spmc_ep_info);
+	cm_setup_context(&spm_ctx->cpu_ctx, spmc_ep_info);
+
+	/* Reuse PSCI affinity states to mark this SPMC context as off */
+	spm_ctx->state = AFF_STATE_OFF;
 
 	INFO("SPM core setup done.\n");
 
@@ -267,20 +246,113 @@ int32_t spmd_setup(void)
 	bl31_register_bl32_init(&spmd_init);
 
 	return 0;
+}
+
+/*******************************************************************************
+ * Initialize context of SPM core.
+ ******************************************************************************/
+int spmd_setup(void)
+{
+	int rc;
+	void *rd_base;
+	size_t rd_size;
+	uintptr_t rd_base_align;
+	uintptr_t rd_size_align;
+
+	spmc_ep_info = bl31_plat_get_next_image_ep_info(SECURE);
+	if (!spmc_ep_info) {
+		WARN("No SPM core image provided by BL2 boot loader, Booting "
+		     "device without SP initialization. SMC`s destined for SPM "
+		     "core will return SMC_UNK\n");
+		return 1;
+	}
+
+	/* Under no circumstances will this parameter be 0 */
+	assert(spmc_ep_info->pc != 0U);
+
+	/*
+	 * Check if BL32 ep_info has a reference to 'tos_fw_config'. This will
+	 * be used as a manifest for the SPM core at the next lower EL/mode.
+	 */
+	if (spmc_ep_info->args.arg0 == 0U || spmc_ep_info->args.arg2 == 0U) {
+		ERROR("Invalid or absent SPM core manifest\n");
+		panic();
+	}
+
+	/* Obtain whereabouts of SPM core manifest */
+	rd_base = (void *) spmc_ep_info->args.arg0;
+	rd_size = spmc_ep_info->args.arg2;
+
+	rd_base_align = page_align((uintptr_t) rd_base, DOWN);
+	rd_size_align = page_align((uintptr_t) rd_size, UP);
+
+	/* Map the manifest in the SPMD translation regime first */
+	VERBOSE("SPM core manifest base : 0x%lx\n", rd_base_align);
+	VERBOSE("SPM core manifest size : 0x%lx\n", rd_size_align);
+	rc = mmap_add_dynamic_region((unsigned long long) rd_base_align,
+				     (uintptr_t) rd_base_align,
+				     rd_size_align,
+				     MT_RO_DATA);
+	if (rc != 0) {
+		ERROR("Error while mapping SPM core manifest (%d).\n", rc);
+		panic();
+	}
+
+	/* Load manifest, init SPMC */
+	rc = spmd_spmc_init(rd_base, rd_size);
+	if (rc != 0) {
+		int mmap_rc;
 
-error:
 		WARN("Booting device without SPM initialization. "
 		     "SPCI SMCs destined for SPM core will return "
 		     "ENOTSUPPORTED\n");
 
-	rc = mmap_remove_dynamic_region(rd_base_align, rd_size_align);
-	if (rc < 0) {
+		mmap_rc = mmap_remove_dynamic_region(rd_base_align,
+						     rd_size_align);
+		if (mmap_rc != 0) {
 			ERROR("Error while unmapping SPM core manifest (%d).\n",
-		      rc);
+			      mmap_rc);
 			panic();
 		}
 
-	return 1;
+		return rc;
+	}
+
+	return 0;
+}
+
+/*******************************************************************************
+ * Forward SMC to the other security state
+ ******************************************************************************/
+static uint64_t spmd_smc_forward(uint32_t smc_fid, uint32_t in_sstate,
+				 uint32_t out_sstate, uint64_t x1,
+				 uint64_t x2, uint64_t x3, uint64_t x4,
+				 void *handle)
+{
+	/* Save incoming security state */
+	cm_el1_sysregs_context_save(in_sstate);
+	cm_el2_sysregs_context_save(in_sstate);
+
+	/* Restore outgoing security state */
+	cm_el1_sysregs_context_restore(out_sstate);
+	cm_el2_sysregs_context_restore(out_sstate);
+	cm_set_next_eret_context(out_sstate);
+
+	SMC_RET8(cm_get_context(out_sstate), smc_fid, x1, x2, x3, x4,
+			SMC_GET_GP(handle, CTX_GPREG_X5),
+			SMC_GET_GP(handle, CTX_GPREG_X6),
+			SMC_GET_GP(handle, CTX_GPREG_X7));
+}
+
+/*******************************************************************************
+ * Return SPCI_ERROR with specified error code
+ ******************************************************************************/
+static uint64_t spmd_spci_error_return(void *handle, int error_code)
+{
+	SMC_RET8(handle, SPCI_ERROR,
+		 SPCI_TARGET_INFO_MBZ, error_code,
+		 SPCI_PARAM_MBZ, SPCI_PARAM_MBZ, SPCI_PARAM_MBZ,
+		 SPCI_PARAM_MBZ, SPCI_PARAM_MBZ);
 }
 
 /*******************************************************************************
@@ -318,22 +390,13 @@ uint64_t spmd_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2,
 		 * this CPU. If so, then indicate that the SPM core initialised
 		 * unsuccessfully.
 		 */
-		if ((in_sstate == SECURE) && (ctx->state == SPMC_STATE_RESET))
+		if ((in_sstate == SECURE) &&
+		    (ctx->state == SPMC_STATE_RESET)) {
 			spmd_spm_core_sync_exit(x2);
+		}
 
-		/* Save incoming security state */
-		cm_el1_sysregs_context_save(in_sstate);
-		cm_el2_sysregs_context_save(in_sstate);
-
-		/* Restore outgoing security state */
-		cm_el1_sysregs_context_restore(out_sstate);
-		cm_el2_sysregs_context_restore(out_sstate);
-		cm_set_next_eret_context(out_sstate);
-
-		SMC_RET8(cm_get_context(out_sstate), smc_fid, x1, x2, x3, x4,
-			 SMC_GET_GP(handle, CTX_GPREG_X5),
-			 SMC_GET_GP(handle, CTX_GPREG_X6),
-			 SMC_GET_GP(handle, CTX_GPREG_X7));
+		return spmd_smc_forward(smc_fid, in_sstate, out_sstate,
+					x1, x2, x3, x4, handle);
 		break; /* not reached */
 
 	case SPCI_VERSION:
@@ -357,31 +420,18 @@ uint64_t spmd_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2,
 		 */
 
 		/*
-		 * Check if w1 holds a valid SPCI fid. This is an
+		 * Check if x1 holds a valid SPCI fid. This is an
 		 * optimization.
 		 */
-		if (!is_spci_fid(x1))
-			SMC_RET8(handle, SPCI_ERROR,
-				 SPCI_TARGET_INFO_MBZ, SPCI_ERROR_NOT_SUPPORTED,
-				 SPCI_PARAM_MBZ, SPCI_PARAM_MBZ, SPCI_PARAM_MBZ,
-				 SPCI_PARAM_MBZ, SPCI_PARAM_MBZ);
+		if (!is_spci_fid(x1)) {
+			return spmd_spci_error_return(handle,
+						      SPCI_ERROR_NOT_SUPPORTED);
+		}
 
 		/* Forward SMC from Normal world to the SPM core */
 		if (in_sstate == NON_SECURE) {
-			/* Save incoming security state */
-			cm_el1_sysregs_context_save(in_sstate);
-			cm_el2_sysregs_context_save(in_sstate);
-
-			/* Restore outgoing security state */
-			cm_el1_sysregs_context_restore(out_sstate);
-			cm_el2_sysregs_context_restore(out_sstate);
-			cm_set_next_eret_context(out_sstate);
-
-			SMC_RET8(cm_get_context(out_sstate), smc_fid,
-				 x1, x2, x3, x4,
-				 SMC_GET_GP(handle, CTX_GPREG_X5),
-				 SMC_GET_GP(handle, CTX_GPREG_X6),
-				 SMC_GET_GP(handle, CTX_GPREG_X7));
+			return spmd_smc_forward(smc_fid, in_sstate, out_sstate,
+						x1, x2, x3, x4, handle);
 		} else {
 			/*
 			 * Return success if call was from secure world i.e. all
@@ -393,6 +443,7 @@ uint64_t spmd_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2,
 				 SMC_GET_GP(handle, CTX_GPREG_X6),
 				 SMC_GET_GP(handle, CTX_GPREG_X7));
 		}
+
 		break; /* not reached */
 
 	case SPCI_RX_RELEASE:
@@ -402,10 +453,8 @@ uint64_t spmd_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2,
 	case SPCI_MSG_RUN:
 		/* This interface must be invoked only by the Normal world */
 		if (in_sstate == SECURE) {
-			SMC_RET8(handle, SPCI_ERROR,
-				 SPCI_TARGET_INFO_MBZ, SPCI_ERROR_NOT_SUPPORTED,
-				 SPCI_PARAM_MBZ, SPCI_PARAM_MBZ, SPCI_PARAM_MBZ,
-				 SPCI_PARAM_MBZ, SPCI_PARAM_MBZ);
+			return spmd_spci_error_return(handle,
+						      SPCI_ERROR_NOT_SUPPORTED);
 		}
 
 		/* Fall through to forward the call to the other world */
@@ -436,19 +485,8 @@ uint64_t spmd_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2,
 		 * simply forward the call to the Normal world.
 		 */
 
-		/* Save incoming security state */
-		cm_el1_sysregs_context_save(in_sstate);
-		cm_el2_sysregs_context_save(in_sstate);
-
-		/* Restore outgoing security state */
-		cm_el1_sysregs_context_restore(out_sstate);
-		cm_el2_sysregs_context_restore(out_sstate);
-		cm_set_next_eret_context(out_sstate);
-
-		SMC_RET8(cm_get_context(out_sstate), smc_fid, x1, x2, x3, x4,
-			 SMC_GET_GP(handle, CTX_GPREG_X5),
-			 SMC_GET_GP(handle, CTX_GPREG_X6),
-			 SMC_GET_GP(handle, CTX_GPREG_X7));
+		return spmd_smc_forward(smc_fid, in_sstate, out_sstate,
+					x1, x2, x3, x4, handle);
 		break; /* not reached */
 
 	case SPCI_MSG_WAIT:
@@ -461,37 +499,21 @@ uint64_t spmd_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2,
 			spmd_spm_core_sync_exit(0);
 		}
 
-		/* Intentional fall-through */
+		/* Fall through to forward the call to the other world */
 
 	case SPCI_MSG_YIELD:
 		/* This interface must be invoked only by the Secure world */
 		if (in_sstate == NON_SECURE) {
-			SMC_RET8(handle, SPCI_ERROR,
-				 SPCI_TARGET_INFO_MBZ, SPCI_ERROR_NOT_SUPPORTED,
-				 SPCI_PARAM_MBZ, SPCI_PARAM_MBZ, SPCI_PARAM_MBZ,
-				 SPCI_PARAM_MBZ, SPCI_PARAM_MBZ);
+			return spmd_spci_error_return(handle,
+						      SPCI_ERROR_NOT_SUPPORTED);
 		}
 
-		/* Save incoming security state */
-		cm_el1_sysregs_context_save(in_sstate);
-		cm_el2_sysregs_context_save(in_sstate);
-
-		/* Restore outgoing security state */
-		cm_el1_sysregs_context_restore(out_sstate);
-		cm_el2_sysregs_context_restore(out_sstate);
-		cm_set_next_eret_context(out_sstate);
-
-		SMC_RET8(cm_get_context(out_sstate), smc_fid, x1, x2, x3, x4,
-			 SMC_GET_GP(handle, CTX_GPREG_X5),
-			 SMC_GET_GP(handle, CTX_GPREG_X6),
-			 SMC_GET_GP(handle, CTX_GPREG_X7));
+		return spmd_smc_forward(smc_fid, in_sstate, out_sstate,
+					x1, x2, x3, x4, handle);
 		break; /* not reached */
 
 	default:
 		WARN("SPM: Unsupported call 0x%08x\n", smc_fid);
-		SMC_RET8(handle, SPCI_ERROR,
-			 SPCI_TARGET_INFO_MBZ, SPCI_ERROR_NOT_SUPPORTED,
-			 SPCI_PARAM_MBZ, SPCI_PARAM_MBZ, SPCI_PARAM_MBZ,
-			 SPCI_PARAM_MBZ, SPCI_PARAM_MBZ);
+		return spmd_spci_error_return(handle, SPCI_ERROR_NOT_SUPPORTED);
 	}
 }