[Skiboot] [PATCH v6 12/22] hdata: Add result table property to "dump" node

[Vasant Hegde]

During MPIPL hostboot updates MDRT table with details of memory movement
(source, destination address, size, etc). Convert these details to fadump
structure format and pass it to kernel via 'result-table' property.

Device tree property:
  /ibm,opal/dump/result-table - follows fadump structure format

Signed-off-by: Vasant Hegde <hegdevasant at linux.vnet.ibm.com>
---
 hdata/spira.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 hdata/spira.h |  4 +++
 2 files changed, 95 insertions(+)

diff --git a/hdata/spira.c b/hdata/spira.c
index d1748511c..d52df3f05 100644
--- a/hdata/spira.c
+++ b/hdata/spira.c
@@ -26,6 +26,8 @@
 #include <fsp-attn.h>
 #include <fsp-leds.h>
 #include <skiboot.h>
+#include <mem_region-malloc.h>
+#include <opal-dump.h>
 
 #include "hdata.h"
 #include "hostservices.h"
@@ -1033,6 +1035,92 @@ static void dt_init_secureboot_node(const struct iplparams_sysparams *sysparams)
 	dt_add_property_cells(node, "hw-key-hash-size", hw_key_hash_size);
 }
 
+static void fadump_add_result_table(const struct iplparams_iplparams *p)
+{
+	int i, j = 0;
+	u32 mdrt_cnt = spira.ntuples.mdump_res.act_cnt;
+	u32 mdrt_max_cnt = MDRT_TABLE_SIZE / sizeof(struct mdrt_table);
+	size_t prop_size;
+	struct mdrt_table *mdrt = (void *)(MDRT_TABLE_BASE);
+	struct fadump_section *fadump_section;
+	struct fadump *result_table;
+	struct dt_node *dump_node;
+
+	dump_node = dt_find_by_path(opal_node, "dump");
+	if (!dump_node)
+		return;
+
+	/* Check boot params to detect MPIPL boot or not */
+	if (p->cec_ipl_maj_type != IPLPARAMS_MAJ_TYPE_REIPL)
+		return;
+	/*
+	 * On FSP system we get minor type as post dump IPL and on BMC system
+	 * we get platform reboot. Hence lets check for both values
+	 */
+	if (p->cec_ipl_min_type != IPLPARAMS_MIN_TYPE_POST_DUMP &&
+	    p->cec_ipl_min_type != IPLPARAMS_MIN_TYPE_PLAT_REBOOT) {
+		prlog(PR_DEBUG, "FADUMP: Non MPIPL reboot "
+		      "[minor type = 0x%x]\n", p->cec_ipl_min_type);
+		return;
+	}
+	if (p->cec_ipl_attrib != IPLPARAMS_ATTRIB_MEM_PRESERVE) {
+		prlog(PR_DEBUG, "FADUMP: Memory not preserved \n");
+		return;
+	}
+
+	if (mdrt_cnt == 0 || mdrt_cnt >= mdrt_max_cnt) {
+		prlog(PR_ERR, "FADUMP: Invalid MDRT count : %x\n", mdrt_cnt);
+		return;
+	}
+
+	prlog(PR_DEBUG, "FADUMP: Dump found, MDRT count = 0x%x\n", mdrt_cnt);
+
+	/* Calculcate property size */
+	prop_size = sizeof(struct fadump) +
+		(mdrt_cnt * sizeof(struct fadump_section));
+	result_table = zalloc(prop_size);
+	if (!result_table) {
+		prlog(PR_ERR, "FADUMP: Failed to allocate memory\n");
+		return;
+	}
+
+	/* Copy MDRT entries to result-table */
+	result_table->fadump_section_size = sizeof(struct fadump_section);
+	for (i = 0; i < mdrt_cnt; i++) {
+		/* Skip garbage entry */
+		if ((mdrt->dest_addr == 0) || (mdrt->size == 0)) {
+			mdrt++;
+			continue;
+		}
+
+		if (mdrt->dump_type != DUMP_TYPE_FADUMP) {
+			mdrt++;
+			continue;
+		}
+
+		fadump_section = &(result_table->section[j++]);
+		fadump_section->source_type = mdrt->data_region;
+		/* Clear top bit */
+		fadump_section->source_addr = mdrt->src_addr & ~(HRMOR_BIT);
+		fadump_section->dest_addr = mdrt->dest_addr & ~(HRMOR_BIT);
+		fadump_section->source_size = mdrt->size;
+		fadump_section->dest_size = mdrt->size;
+		mdrt++;
+	}
+
+	if (j == 0) {
+		prlog(PR_DEBUG, "FADUMP: MDRT table is empty\n");
+		free(result_table);
+		return;
+	}
+
+	result_table->section_count = j;
+	/* Actual property size */
+	prop_size = sizeof(struct fadump) + (j * sizeof(struct fadump_section));
+	dt_add_property(dump_node, "result-table", result_table, prop_size);
+	free(result_table);
+}
+
 static void fadump_add_node(void)
 {
 	u64 fw_load_area[4];
@@ -1196,6 +1284,9 @@ static void add_iplparams_ipl_params(const void *iplp, struct dt_node *node)
 	else
 		dt_add_property_strings(led_node, DT_PROPERTY_LED_MODE,
 					LED_MODE_GUIDING_LIGHT);
+
+	/* Populate fadump result table */
+	fadump_add_result_table(p);
 }
 
 static void add_iplparams_serials(const void *iplp, struct dt_node *node)
diff --git a/hdata/spira.h b/hdata/spira.h
index 5c030692e..ed759d50f 100644
--- a/hdata/spira.h
+++ b/hdata/spira.h
@@ -401,8 +401,12 @@ struct iplparams_iplparams {
 #define IPLPARAMS_FSP_FW_IPL_SIDE_TEMP	0x01
 	uint8_t		ipl_speed;
 	__be16		cec_ipl_attrib;
+#define IPLPARAMS_ATTRIB_MEM_PRESERVE	PPC_BIT16(2)
 	uint8_t		cec_ipl_maj_type;
+#define IPLPARAMS_MAJ_TYPE_REIPL	0x1
 	uint8_t		cec_ipl_min_type;
+#define IPLPARAMS_MIN_TYPE_POST_DUMP	0xc
+#define IPLPARAMS_MIN_TYPE_PLAT_REBOOT	0xd
 	uint8_t		os_ipl_mode;
 	uint8_t		keylock_pos;
 	uint8_t		lmb_size;
-- 
2.14.3