[Skiboot] [RFC PATCH 02/16] hdata: Fix MDST structure

[Vasant Hegde]

We have split the type field to accommodate below fields which are used by
memory preserving IPL.
  - data region : dump data regions (like DUMP_REGION_* )
  - dump type   : Reflects MDST entry usage (used by SYSDUMP -OR- FADUMP)

This patch makes structure changes and necessary code adjustment.

Signed-off-by: Vasant Hegde <hegdevasant at linux.vnet.ibm.com>
---
 hdata/spira.c        |  6 ++++--
 hw/fsp/fsp-sysdump.c | 10 ++++++----
 include/opal-dump.h  | 18 ++++++++++++++----
 3 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/hdata/spira.c b/hdata/spira.c
index ba9fe5f69..43363278d 100644
--- a/hdata/spira.c
+++ b/hdata/spira.c
@@ -92,12 +92,14 @@ __section(".cpuctrl.data") struct cpu_ctl_init_data cpu_ctl_init_data = {
 __section(".mdst.data") struct mdst_table init_mdst_table[2] = {
 	{
 		.addr = CPU_TO_BE64(INMEM_CON_START | HRMOR_BIT),
-		.type = CPU_TO_BE32(DUMP_REGION_CONSOLE),
+		.data_region = DUMP_REGION_CONSOLE,
+		.dump_type = DUMP_TYPE_SYSDUMP,
 		.size = CPU_TO_BE32(INMEM_CON_LEN),
 	},
 	{
 		.addr = CPU_TO_BE64(HBRT_CON_START | HRMOR_BIT),
-		.type = CPU_TO_BE32(DUMP_REGION_HBRT_LOG),
+		.data_region = DUMP_REGION_HBRT_LOG,
+		.dump_type = DUMP_TYPE_SYSDUMP,
 		.size = CPU_TO_BE32(HBRT_CON_LEN),
 	},
 };
diff --git a/hw/fsp/fsp-sysdump.c b/hw/fsp/fsp-sysdump.c
index 5f88733db..92b812eae 100644
--- a/hw/fsp/fsp-sysdump.c
+++ b/hw/fsp/fsp-sysdump.c
@@ -114,7 +114,8 @@ static int dump_region_tce_map(void)
 		fsp_tce_map(PSI_DMA_HYP_DUMP + t_size, (void *)addr, size);
 
 		/* Add entry to MDST table */
-		mdst_table[i].type = dump_mem_region[i].type;
+		mdst_table[i].data_region = dump_mem_region[i].data_region;
+		mdst_table[i].dump_type = DUMP_TYPE_SYSDUMP;
 		mdst_table[i].size = dump_mem_region[i].size;
 		mdst_table[i].addr = cpu_to_be64(PSI_DMA_HYP_DUMP + t_size);
 
@@ -194,7 +195,7 @@ static int dump_region_del_entry(uint32_t id)
 	lock(&mdst_lock);
 
 	for (i = 0; i < cur_mdst_entry; i++) {
-		if (be32_to_cpu(dump_mem_region[i].type) != id)
+		if (dump_mem_region[i].data_region != id)
 			continue;
 
 		found = true;
@@ -214,7 +215,7 @@ static int dump_region_del_entry(uint32_t id)
 	for ( ; i < cur_mdst_entry - 1; i++)
 		dump_mem_region[i] = dump_mem_region[i + 1];
 
-	dump_mem_region[i].type = 0;
+	dump_mem_region[i].data_region = 0;
 	cur_mdst_entry--;
 
 del_out:
@@ -251,7 +252,8 @@ static int __dump_region_add_entry(uint32_t id, uint64_t addr, uint32_t size)
 	}
 
 	/* Add entry to dump memory region table */
-	dump_mem_region[cur_mdst_entry].type = cpu_to_be32(id);
+	dump_mem_region[cur_mdst_entry].data_region = (u8)cpu_to_be32(id);
+	dump_mem_region[cur_mdst_entry].dump_type = DUMP_TYPE_SYSDUMP;
 	dump_mem_region[cur_mdst_entry].addr = cpu_to_be64(addr);
 	dump_mem_region[cur_mdst_entry].size = cpu_to_be32(size);
 
diff --git a/include/opal-dump.h b/include/opal-dump.h
index 9ffffeeee..0dedeae86 100644
--- a/include/opal-dump.h
+++ b/include/opal-dump.h
@@ -21,10 +21,13 @@
 /*
  * Dump region ids
  *
- * 0x01 - 0x7F : OPAL
+ * 0x00 - 0x00 : CPU data
+ * 0x01 - 0x3F : OPAL
+ * 0x40 - 0x79 : Reserved for future use
  * 0x80 - 0xFF : Kernel
  *
  */
+#define DUMP_REGION_CPU_DATA		0x00
 #define DUMP_REGION_OPAL_START		0x01
 #define DUMP_REGION_OPAL_END		0x7F
 #define DUMP_REGION_HOST_START		OPAL_DUMP_REGION_HOST_START
@@ -33,16 +36,23 @@
 #define DUMP_REGION_CONSOLE	0x01
 #define DUMP_REGION_HBRT_LOG	0x02
 
+/* Mainstore memory to be captured by FSP SYSDUMP */
+#define DUMP_TYPE_SYSDUMP		0xF5
+/* Mainstore memory to preserve during IPL */
+#define DUMP_TYPE_FADUMP		0x00
+
 /*
- * Sapphire Memory Dump Source Table
+ *  Memory Dump Source Table
  *
  * Format of this table is same as Memory Dump Source Table (MDST)
  * defined in HDAT spec.
  */
 struct mdst_table {
 	__be64	addr;
-	__be32	type; /* DUMP_REGION_* */
+	uint8_t	data_region;	/* DUMP_REGION_* */
+	uint8_t dump_type;	/* DUMP_TYPE_* */
+	__be16	reserved;
 	__be32	size;
-};
+} __packed;
 
 #endif	/* __OPAL_DUMP_H */
-- 
2.14.3