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From:   Pratik Rajesh Sampat <psampat@linux.ibm.com>
To:     linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
        mpe@ellerman.id.au, skiboot@lists.ozlabs.org, oohall@gmail.com,
        ego@linux.vnet.ibm.com, linuxram@us.ibm.com,
        pratik.r.sampat@gmail.com, psampat@linux.ibm.com
Subject: [PATCH v7 3/4] API to verify the STOP API and image compatibility
Date:   Thu, 16 Apr 2020 13:23:40 +0530
In-Reply-To: <20200416075341.75268-1-psampat@linux.ibm.com>
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From: Prem Shanker Jha <premjha2@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.

Change-Id: Ic0de45a336cfb8b6b6096a10ac1cd3ffbaa44fc0
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/77612
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Reviewed-by: RANGANATHPRASAD G. BRAHMASAMUDRA <prasadbgr@in.ibm.com>
Reviewed-by: Gregory S Still <stillgs@us.ibm.com>
Reviewed-by: Jennifer A Stofer <stofer@us.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/77614
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M Crowell <dcrowell@us.ibm.com>
Signed-off-by: Pratik Rajesh Sampat <psampat@linux.ibm.com>
---
 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                    | 58 +++++++++++++++++++++++-
 libpore/p9_stop_api.H                    | 26 ++++++++++-
 libpore/p9_stop_util.H                   | 20 ++++----
 6 files changed, 131 insertions(+), 13 deletions(-)

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..10e050a1 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 +1828,62 @@ 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 );
+
+        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;
+        }
+
+        *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
diff --git a/libpore/p9_stop_util.H b/libpore/p9_stop_util.H
index 79b4e959..1328a54b 100644
--- a/libpore/p9_stop_util.H
+++ b/libpore/p9_stop_util.H
@@ -72,18 +72,18 @@ namespace stopImageSection
     ( (((WORD) >> 8) & 0x00FF) | (((WORD) << 8) & 0xFF00) )
 
 #define SWIZZLE_4_BYTE(WORD) \
-    ( (((WORD) >> 24) & 0x000000FF) | (((WORD) >>  8) & 0x0000FF00) | \
-      (((WORD) <<  8) & 0x00FF0000) | (((WORD) << 24) & 0xFF000000) )
+    ( (((WORD) & 0x000000FF) << 24) | (((WORD) & 0x0000FF00) <<  8) | \
+      (((WORD) & 0x00FF0000) >>  8) | (((WORD) & 0xFF000000) >> 24) )
 
 #define SWIZZLE_8_BYTE(WORD) \
-    ( (((WORD) >> 56) & 0x00000000000000FF) |  \
-      (((WORD) >> 40) & 0x000000000000FF00)| \
-      (((WORD) >> 24) & 0x0000000000FF0000) |  \
-      (((WORD) >>  8) & 0x00000000FF000000) |  \
-      (((WORD) <<  8) & 0x000000FF00000000) |  \
-      (((WORD) << 24) & 0x0000FF0000000000) | \
-      (((WORD) << 40) & 0x00FF000000000000) |  \
-      (((WORD) << 56) & 0xFF00000000000000) )
+    ( (((WORD) & 0x00000000000000ffULL) << 56) | \
+      (((WORD) & 0x000000000000ff00ULL) << 40) | \
+      (((WORD) & 0x0000000000ff0000ULL) << 24) | \
+      (((WORD) & 0x00000000ff000000ULL) <<  8) | \
+      (((WORD) & 0x000000ff00000000ULL) >>  8) | \
+      (((WORD) & 0x0000ff0000000000ULL) >> 24) | \
+      (((WORD) & 0x00ff000000000000ULL) >> 40) | \
+      (((WORD) & 0xff00000000000000ULL) >> 56) )
 #endif
 
 /**
-- 
2.25.1