[Skiboot] [PATCH v3 4/4] API to verify the STOP API and image compatibility

Pratik Rajesh Sampat psampat at linux.ibm.com
Fri Feb 7 15:20:08 AEDT 2020


From: Prem Shanker Jha <premjha2 at in.ibm.com>

Commit defines a new API primarily intended for OPAL to determine
cpu register save API's compatibility with HOMER layout and
self save restore. It can help OPAL determine if version of
API integrated with OPAL is different from hostboot.

This is used in the context of identifying support for self save in the
firmware. In the case the version of the firmware is older then we
simply cut support for the feature in the device tree rather than
catching the failure when the call is made.

Change-Id: Ic0de45a336cfb8b6b6096a10ac1cd3ffbaa44fc0
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/77612
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot at us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot at us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot at us.ibm.com>
Reviewed-by: RANGANATHPRASAD G. BRAHMASAMUDRA <prasadbgr at in.ibm.com>
Reviewed-by: Gregory S Still <stillgs at us.ibm.com>
Reviewed-by: Jennifer A Stofer <stofer at us.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/77614
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot at us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot at us.ibm.com>
Reviewed-by: Daniel M Crowell <dcrowell at us.ibm.com>
Signed-off-by: Pratik Rajesh Sampat <psampat at linux.ibm.com>

Co-authored-by: Prem Shanker Jha <premjha2 at in.ibm.com>
Co-authored-by: Pratik Rajesh Sampat <psampat at linux.ibm.com>
---
 hw/slw.c                                 | 22 ++++++++-
 include/p9_stop_api.H                    | 26 ++++++++++
 libpore/p9_cpu_reg_restore_instruction.H |  7 ++-
 libpore/p9_hcd_memmap_base.H             |  7 +++
 libpore/p9_stop_api.C                    | 60 +++++++++++++++++++++++-
 libpore/p9_stop_api.H                    | 26 +++++++++-
 6 files changed, 143 insertions(+), 5 deletions(-)

diff --git a/hw/slw.c b/hw/slw.c
index 087a8619..95ba8dcd 100644
--- a/hw/slw.c
+++ b/hw/slw.c
@@ -756,9 +756,12 @@ static void slw_late_init_p9(struct proc_chip *chip)
 /* Add device tree properties to determine self-save | restore */
 void add_cpu_self_save_properties()
 {
-	int i;
+	int i, rc;
+	bool self_save_supported = true;
 	struct dt_node *self_restore, *self_save, *power_mgt;
 	bitmap_t *self_restore_map, *self_save_map;
+	uint64_t compVector = -1;
+	struct proc_chip *chip;
 
 	const uint64_t self_restore_regs[] = {
 		P8_SPR_HRMOR,
@@ -791,6 +794,21 @@ void add_cpu_self_save_properties()
 	self_save_map = zalloc(BITMAP_BYTES(SPR_BITMAP_LENGTH));
 	self_restore_map = zalloc(BITMAP_BYTES(SPR_BITMAP_LENGTH));
 
+	chip = next_chip(NULL);
+	assert(chip);
+	rc = proc_stop_api_discover_capability((void *) chip->homer_base,
+					       &compVector);
+	if (rc == STOP_SAVE_ARG_INVALID_IMG) {
+		prlog(PR_DEBUG, "HOMER BASE INVALID\n");
+		goto bail;
+	} else if (rc == STOP_SAVE_API_IMG_INCOMPATIBLE) {
+		prlog(PR_DEBUG, "STOP API running incompatible versions\n");
+		if ((compVector & SELF_RESTORE_VER_MISMATCH) == 0) {
+			prlog(PR_DEBUG, "Self-save API unsupported\n");
+			self_save_supported = false;
+		}
+	}
+
 	for (i = 0; i < ARRAY_SIZE(self_save_regs); i++)
 		bitmap_set_bit(*self_save_map, self_save_regs[i]);
 
@@ -818,7 +836,7 @@ void add_cpu_self_save_properties()
 		prerror("OCC: Failed to create self save node");
 		goto bail;
 	}
-	if (proc_gen == proc_gen_p9) {
+	if (proc_gen == proc_gen_p9 && self_save_supported) {
 		dt_add_property_string(self_save, "status", "enabled");
 
 		dt_add_property(self_save, "sprn-bitmask", *self_save_map,
diff --git a/include/p9_stop_api.H b/include/p9_stop_api.H
index c304f70f..09ce3dc1 100644
--- a/include/p9_stop_api.H
+++ b/include/p9_stop_api.H
@@ -110,6 +110,7 @@ typedef enum
     STOP_SAVE_FAIL                       = 14,  // for internal failure within firmware.
     STOP_SAVE_SPR_ENTRY_MISSING          =  15,
     STOP_SAVE_SPR_BIT_POS_RESERVE        =  16,
+    STOP_SAVE_API_IMG_INCOMPATIBLE       =  18,
 } StopReturnCode_t;
 
 /**
@@ -164,6 +165,14 @@ typedef enum
 
 } ScomSection_t;
 
+/**
+ * @brief   versions pertaining relvant to STOP API.
+ */
+typedef enum
+{
+    STOP_API_VER            =   0x00,
+    STOP_API_VER_CONTROL    =   0x02,
+} VersionList_t;
 
 
 /**
@@ -195,6 +204,14 @@ typedef enum
     BIT_POS_USPRG1      =   30,
 } SprBitPositionList_t;
 
+typedef enum
+{
+    SMF_SUPPORT_MISSING_IN_HOMER         =   0x01,
+    SELF_SUPPORT_MISSING_FOR_LE_HYP      =   0x02,
+    IPL_RUNTIME_CPU_SAVE_VER_MISMATCH    =   0x04,
+    SELF_RESTORE_VER_MISMATCH            =   0x08,
+} VersionIncompList_t;
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -247,6 +264,15 @@ StopReturnCode_t p9_stop_save_scom( void* const   i_pImage,
 StopReturnCode_t
 p9_stop_save_cpureg_control( void* i_pImage, const uint64_t i_pir,
                              const uint32_t  i_saveRegVector );
+
+/**
+ * @brief       verifies if API is compatible of current HOMER image.
+ * @param[in]   i_pImage        points to the start of HOMER image of P9 chip.
+ * @param[out]  o_inCompVector  list of incompatibilities found.
+ * @return      STOP_SAVE_SUCCESS if if API succeeds, error code otherwise.
+ */
+StopReturnCode_t proc_stop_api_discover_capability( void* const i_pImage, uint64_t* o_inCompVector );
+
 #ifdef __cplusplus
 } // extern "C"
 };  // namespace stopImageSection ends
diff --git a/libpore/p9_cpu_reg_restore_instruction.H b/libpore/p9_cpu_reg_restore_instruction.H
index d69a4212..5f168855 100644
--- a/libpore/p9_cpu_reg_restore_instruction.H
+++ b/libpore/p9_cpu_reg_restore_instruction.H
@@ -5,7 +5,7 @@
 /*                                                                        */
 /* OpenPOWER HostBoot Project                                             */
 /*                                                                        */
-/* Contributors Listed Below - COPYRIGHT 2015,2018                        */
+/* Contributors Listed Below - COPYRIGHT 2015,2020                        */
 /* [+] International Business Machines Corp.                              */
 /*                                                                        */
 /*                                                                        */
@@ -69,6 +69,11 @@ enum
     OPCODE_18           =   18,
     SELF_SAVE_FUNC_ADD  =   0x2300,
     SELF_SAVE_OFFSET    =   0x180,
+    SKIP_SPR_REST_INST  =   0x4800001c, //b . +0x01c
+    MFLR_R30            =   0x7fc802a6,
+    SKIP_SPR_SELF_SAVE  =   0x3bff0020, //addi r31 r31, 0x20
+    MTLR_INST           =   0x7fc803a6,  //mtlr r30
+    BRANCH_BE_INST      =   0x48000020,
 };
 
 #define MR_R0_TO_R10            0x7c0a0378UL //mr r10 r0
diff --git a/libpore/p9_hcd_memmap_base.H b/libpore/p9_hcd_memmap_base.H
index 000fafef..ddb56728 100644
--- a/libpore/p9_hcd_memmap_base.H
+++ b/libpore/p9_hcd_memmap_base.H
@@ -444,6 +444,13 @@ HCD_CONST(CME_QUAD_PSTATE_SIZE,                 HALF_KB)
 
 HCD_CONST(CME_REGION_SIZE,                      (64 * ONE_KB))
 
+
+// HOMER compatibility
+
+HCD_CONST(STOP_API_CPU_SAVE_VER,                0x02)
+HCD_CONST(SELF_SAVE_RESTORE_VER,                0x02)
+HCD_CONST(SMF_SUPPORT_SIGNATURE_OFFSET,         0x1300)
+HCD_CONST(SMF_SELF_SIGNATURE,                   (0x5f534d46))
 // Debug
 
 HCD_CONST(CPMR_TRACE_REGION_OFFSET,             (512 * ONE_KB))
diff --git a/libpore/p9_stop_api.C b/libpore/p9_stop_api.C
index 2d9bb549..74341cff 100644
--- a/libpore/p9_stop_api.C
+++ b/libpore/p9_stop_api.C
@@ -5,7 +5,7 @@
 /*                                                                        */
 /* OpenPOWER HostBoot Project                                             */
 /*                                                                        */
-/* Contributors Listed Below - COPYRIGHT 2015,2018                        */
+/* Contributors Listed Below - COPYRIGHT 2015,2020                        */
 /* [+] International Business Machines Corp.                              */
 /*                                                                        */
 /*                                                                        */
@@ -1828,6 +1828,64 @@ StopReturnCode_t proc_stop_init_self_save(  void* const i_pImage, const uint32_t
     return l_rc;
 }
 
+StopReturnCode_t proc_stop_api_discover_capability( void* const i_pImage, uint64_t * o_inCompVector )
+{
+    StopReturnCode_t l_rc       =   STOP_SAVE_SUCCESS;
+    uint64_t l_incompVector     =   0;
+    uint32_t l_tempWord         =   0;
+    *o_inCompVector             =   0;
+
+    do
+    {
+        if( !i_pImage )
+        {
+            l_rc    =   STOP_SAVE_ARG_INVALID_IMG;
+            break;
+        }
+
+        l_tempWord      =
+                *(uint32_t*)((uint8_t*)i_pImage + CPMR_HOMER_OFFSET + SMF_SUPPORT_SIGNATURE_OFFSET);
+
+        if( l_tempWord != SWIZZLE_4_BYTE(SMF_SELF_SIGNATURE) )
+        {
+            l_incompVector  |=  SMF_SUPPORT_MISSING_IN_HOMER;
+        }
+
+        l_tempWord      =   *(uint32_t *)((uint8_t *)i_pImage + CPMR_HOMER_OFFSET + CPMR_HEADER_SIZE );
+
+        if( l_tempWord != SWIZZLE_4_BYTE(BRANCH_BE_INST) )
+        {
+            l_incompVector  |=  SELF_SUPPORT_MISSING_FOR_LE_HYP;
+        }
+
+        l_tempWord      =   *(uint8_t *)((uint8_t *)i_pImage + CPMR_HOMER_OFFSET + CPMR_SELF_RESTORE_VER_BYTE );
+
+        prlog(PR_EMERG, "SLW: self save ltemp: 0x%x\n", l_tempWord);
+        if( l_tempWord < SELF_SAVE_RESTORE_VER )
+        {
+            l_incompVector  |=  SELF_RESTORE_VER_MISMATCH;
+        }
+
+        l_tempWord      =   *(uint8_t *)((uint8_t *)i_pImage + CPMR_HOMER_OFFSET + CPMR_STOP_API_VER_BYTE );
+
+        if( l_tempWord < STOP_API_CPU_SAVE_VER )
+        {
+            l_incompVector  |=  IPL_RUNTIME_CPU_SAVE_VER_MISMATCH;
+        }
+
+        prlog(PR_EMERG, "SLW: Comp: 0x%llx\n", l_incompVector);
+        *o_inCompVector     =   l_incompVector;
+
+        if( l_incompVector )
+        {
+            l_rc    =  STOP_SAVE_API_IMG_INCOMPATIBLE;
+        }
+
+    }while(0);
+
+    return l_rc;
+}
+
 #ifdef __cplusplus
 } //namespace stopImageSection ends
 
diff --git a/libpore/p9_stop_api.H b/libpore/p9_stop_api.H
index 3f6420ff..983a3845 100644
--- a/libpore/p9_stop_api.H
+++ b/libpore/p9_stop_api.H
@@ -5,7 +5,7 @@
 /*                                                                        */
 /* OpenPOWER HostBoot Project                                             */
 /*                                                                        */
-/* Contributors Listed Below - COPYRIGHT 2015,2018                        */
+/* Contributors Listed Below - COPYRIGHT 2015,2020                        */
 /* [+] International Business Machines Corp.                              */
 /*                                                                        */
 /*                                                                        */
@@ -114,6 +114,7 @@ typedef enum
     STOP_SAVE_FAIL                       =  14,  // for internal failure within firmware.
     STOP_SAVE_SPR_ENTRY_MISSING          =  15,
     STOP_SAVE_SPR_BIT_POS_RESERVE        =  16,
+    STOP_SAVE_API_IMG_INCOMPATIBLE       =  18,
 } StopReturnCode_t;
 
 /**
@@ -198,6 +199,21 @@ typedef enum
     BIT_POS_USPRG1      =   30,
 } SprBitPositionList_t;
 
+/**
+ * @brief   List of major incompatibilities between API version.
+ * @note    STOP APIs assumes a specific HOMER layout, certain
+ * level of CME-SGPE hcode and certain version of self-save restore
+ * binary. A mismatch can break STOP function.
+ */
+
+typedef enum
+{
+    SMF_SUPPORT_MISSING_IN_HOMER         =   0x01,
+    SELF_SUPPORT_MISSING_FOR_LE_HYP      =   0x02,
+    IPL_RUNTIME_CPU_SAVE_VER_MISMATCH    =   0x04,
+    SELF_RESTORE_VER_MISMATCH            =   0x08,
+} VersionIncompList_t;
+
 
 #ifdef __cplusplus
 extern "C" {
@@ -341,6 +357,14 @@ StopReturnCode_t proc_stop_save_cpureg(  void* const i_pImage,
  */
 StopReturnCode_t proc_stop_init_self_save(  void* const i_pImage, const uint32_t i_corePos );
 
+/**
+ * @brief       verifies if API is compatible of current HOMER image.
+ * @param[in]   i_pImage        points to the start of HOMER image of P9 chip.
+ * @param[out]  o_inCompVector  list of incompatibilities found.
+ * @return      STOP_SAVE_SUCCESS if if API succeeds, error code otherwise.
+ */
+StopReturnCode_t proc_stop_api_discover_capability( void* const i_pImage, uint64_t* o_inCompVector );
+
 #ifdef __cplusplus
 } // extern "C"
 };  // namespace stopImageSection ends
-- 
2.24.1



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