pseries/fadump: define RTAS register/un-register callback functions

Move platform specific register/un-register code, the RTAS calls, to
register/un-register callback functions. This would also mean moving
code that initializes and prints the platform specific FADump data.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Reviewed-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/156821332856.5656.16380417702046411631.stgit@hbathini.in.ibm.com

3 files changed, 176 insertions, 153 deletions

diff --git a/arch/powerpc/include/asm/fadump-internal.h b/arch/powerpc/include/asm/fadump-internal.h
index 8ecd23421b6c..8c0eb0fc09d0 100644
--- a/arch/powerpc/include/asm/fadump-internal.h
+++ b/arch/powerpc/include/asm/fadump-internal.h
@@ -89,7 +89,9 @@ struct fw_dump {
 
 	unsigned long	cpu_state_data_size;
 	unsigned long	hpte_region_size;
+
 	unsigned long	boot_memory_size;
+	u64		boot_mem_dest_addr;
 
 	unsigned long	fadumphdr_addr;
 	unsigned long	cpu_notes_buf_vaddr;
diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index aa342ee53acb..3cf621080427 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -36,7 +36,6 @@
 #include "../platforms/pseries/rtas-fadump.h"
 
 static struct fw_dump fw_dump;
-static struct rtas_fadump_mem_struct fdm;
 static const struct rtas_fadump_mem_struct *fdm_active;
 
 static DEFINE_MUTEX(fadump_mutex);
@@ -229,61 +228,6 @@ static void fadump_show_config(void)
 	pr_debug("Boot memory size  : %lx\n", fw_dump.boot_memory_size);
 }
 
-static unsigned long init_fadump_mem_struct(struct rtas_fadump_mem_struct *fdm,
-				unsigned long addr)
-{
-	if (!fdm)
-		return 0;
-
-	memset(fdm, 0, sizeof(struct rtas_fadump_mem_struct));
-	addr = addr & PAGE_MASK;
-
-	fdm->header.dump_format_version = cpu_to_be32(0x00000001);
-	fdm->header.dump_num_sections = cpu_to_be16(3);
-	fdm->header.dump_status_flag = 0;
-	fdm->header.offset_first_dump_section =
-		cpu_to_be32((u32)offsetof(struct rtas_fadump_mem_struct, cpu_state_data));
-
-	/*
-	 * Fields for disk dump option.
-	 * We are not using disk dump option, hence set these fields to 0.
-	 */
-	fdm->header.dd_block_size = 0;
-	fdm->header.dd_block_offset = 0;
-	fdm->header.dd_num_blocks = 0;
-	fdm->header.dd_offset_disk_path = 0;
-
-	/* set 0 to disable an automatic dump-reboot. */
-	fdm->header.max_time_auto = 0;
-
-	/* Kernel dump sections */
-	/* cpu state data section. */
-	fdm->cpu_state_data.request_flag = cpu_to_be32(RTAS_FADUMP_REQUEST_FLAG);
-	fdm->cpu_state_data.source_data_type = cpu_to_be16(RTAS_FADUMP_CPU_STATE_DATA);
-	fdm->cpu_state_data.source_address = 0;
-	fdm->cpu_state_data.source_len = cpu_to_be64(fw_dump.cpu_state_data_size);
-	fdm->cpu_state_data.destination_address = cpu_to_be64(addr);
-	addr += fw_dump.cpu_state_data_size;
-
-	/* hpte region section */
-	fdm->hpte_region.request_flag = cpu_to_be32(RTAS_FADUMP_REQUEST_FLAG);
-	fdm->hpte_region.source_data_type = cpu_to_be16(RTAS_FADUMP_HPTE_REGION);
-	fdm->hpte_region.source_address = 0;
-	fdm->hpte_region.source_len = cpu_to_be64(fw_dump.hpte_region_size);
-	fdm->hpte_region.destination_address = cpu_to_be64(addr);
-	addr += fw_dump.hpte_region_size;
-
-	/* RMA region section */
-	fdm->rmr_region.request_flag = cpu_to_be32(RTAS_FADUMP_REQUEST_FLAG);
-	fdm->rmr_region.source_data_type = cpu_to_be16(RTAS_FADUMP_REAL_MODE_REGION);
-	fdm->rmr_region.source_address = cpu_to_be64(RMA_START);
-	fdm->rmr_region.source_len = cpu_to_be64(fw_dump.boot_memory_size);
-	fdm->rmr_region.destination_address = cpu_to_be64(addr);
-	addr += fw_dump.boot_memory_size;
-
-	return addr;
-}
-
 /**
  * fadump_calculate_reserve_size(): reserve variable boot area 5% of System RAM
  *
@@ -546,61 +490,6 @@ static int __init early_fadump_reserve_mem(char *p)
 }
 early_param("fadump_reserve_mem", early_fadump_reserve_mem);
 
-static int register_fw_dump(struct rtas_fadump_mem_struct *fdm)
-{
-	int rc, err;
-	unsigned int wait_time;
-
-	pr_debug("Registering for firmware-assisted kernel dump...\n");
-
-	/* TODO: Add upper time limit for the delay */
-	do {
-		rc = rtas_call(fw_dump.ibm_configure_kernel_dump, 3, 1, NULL,
-			FADUMP_REGISTER, fdm,
-			sizeof(struct rtas_fadump_mem_struct));
-
-		wait_time = rtas_busy_delay_time(rc);
-		if (wait_time)
-			mdelay(wait_time);
-
-	} while (wait_time);
-
-	err = -EIO;
-	switch (rc) {
-	default:
-		pr_err("Failed to register. Unknown Error(%d).\n", rc);
-		break;
-	case -1:
-		printk(KERN_ERR "Failed to register firmware-assisted kernel"
-			" dump. Hardware Error(%d).\n", rc);
-		break;
-	case -3:
-		if (!is_fadump_boot_mem_contiguous())
-			pr_err("Can't have holes in boot memory area while registering fadump\n");
-		else if (!is_fadump_reserved_mem_contiguous())
-			pr_err("Can't have holes in reserved memory area while"
-			       " registering fadump\n");
-
-		printk(KERN_ERR "Failed to register firmware-assisted kernel"
-			" dump. Parameter Error(%d).\n", rc);
-		err = -EINVAL;
-		break;
-	case -9:
-		printk(KERN_ERR "firmware-assisted kernel dump is already "
-			" registered.");
-		fw_dump.dump_registered = 1;
-		err = -EEXIST;
-		break;
-	case 0:
-		printk(KERN_INFO "firmware-assisted kernel dump registration"
-			" is successful\n");
-		fw_dump.dump_registered = 1;
-		err = 0;
-		break;
-	}
-	return err;
-}
-
 void crash_fadump(struct pt_regs *regs, const char *str)
 {
 	struct fadump_crash_info_header *fdh = NULL;
@@ -643,8 +532,7 @@ void crash_fadump(struct pt_regs *regs, const char *str)
 
 	fdh->online_mask = *cpu_online_mask;
 
-	/* Call ibm,os-term rtas call to trigger firmware assisted dump */
-	rtas_os_term((char *)str);
+	fw_dump.ops->fadump_trigger(fdh, str);
 }
 
 #define GPR_MASK	0xffffff0000000000
@@ -1129,7 +1017,7 @@ static int fadump_setup_crash_memory_ranges(void)
 static inline unsigned long fadump_relocate(unsigned long paddr)
 {
 	if (paddr > RMA_START && paddr < fw_dump.boot_memory_size)
-		return be64_to_cpu(fdm.rmr_region.destination_address) + paddr;
+		return fw_dump.boot_mem_dest_addr + paddr;
 	else
 		return paddr;
 }
@@ -1202,7 +1090,7 @@ static int fadump_create_elfcore_headers(char *bufp)
 			 * to the specified destination_address. Hence set
 			 * the correct offset.
 			 */
-			phdr->p_offset = be64_to_cpu(fdm.rmr_region.destination_address);
+			phdr->p_offset = fw_dump.boot_mem_dest_addr;
 		}
 
 		phdr->p_paddr = mbase;
@@ -1254,7 +1142,8 @@ static int register_fadump(void)
 	if (ret)
 		return ret;
 
-	addr = be64_to_cpu(fdm.rmr_region.destination_address) + be64_to_cpu(fdm.rmr_region.source_len);
+	addr = fw_dump.fadumphdr_addr;
+
 	/* Initialize fadump crash info header. */
 	addr = init_fadump_header(addr);
 	vaddr = __va(addr);
@@ -1263,34 +1152,8 @@ static int register_fadump(void)
 	fadump_create_elfcore_headers(vaddr);
 
 	/* register the future kernel dump with firmware. */
-	return register_fw_dump(&fdm);
-}
-
-static int fadump_unregister_dump(struct rtas_fadump_mem_struct *fdm)
-{
-	int rc = 0;
-	unsigned int wait_time;
-
-	pr_debug("Un-register firmware-assisted dump\n");
-
-	/* TODO: Add upper time limit for the delay */
-	do {
-		rc = rtas_call(fw_dump.ibm_configure_kernel_dump, 3, 1, NULL,
-			FADUMP_UNREGISTER, fdm,
-			sizeof(struct rtas_fadump_mem_struct));
-
-		wait_time = rtas_busy_delay_time(rc);
-		if (wait_time)
-			mdelay(wait_time);
-	} while (wait_time);
-
-	if (rc) {
-		printk(KERN_ERR "Failed to un-register firmware-assisted dump."
-			" unexpected error(%d).\n", rc);
-		return rc;
-	}
-	fw_dump.dump_registered = 0;
-	return 0;
+	pr_debug("Registering for firmware-assisted kernel dump...\n");
+	return fw_dump.ops->fadump_register(&fw_dump);
 }
 
 static int fadump_invalidate_dump(const struct rtas_fadump_mem_struct *fdm)
@@ -1328,7 +1191,7 @@ void fadump_cleanup(void)
 		fadump_invalidate_dump(fdm_active);
 	} else if (fw_dump.dump_registered) {
 		/* Un-register Firmware-assisted dump if it was registered. */
-		fadump_unregister_dump(&fdm);
+		fw_dump.ops->fadump_unregister(&fw_dump);
 		free_crash_memory_ranges();
 	}
 }
@@ -1433,7 +1296,7 @@ static void fadump_invalidate_release_mem(void)
 	fadump_free_cpu_notes_buf();
 
 	/* Initialize the kernel dump memory structure for FAD registration. */
-	init_fadump_mem_struct(&fdm, fw_dump.reserve_dump_area_start);
+	fw_dump.ops->fadump_init_mem_struct(&fw_dump);
 }
 
 static ssize_t fadump_release_memory_store(struct kobject *kobj,
@@ -1498,12 +1361,13 @@ static ssize_t fadump_register_store(struct kobject *kobj,
 			goto unlock_out;
 		}
 		/* Un-register Firmware-assisted dump */
-		fadump_unregister_dump(&fdm);
+		pr_debug("Un-register firmware-assisted dump\n");
+		fw_dump.ops->fadump_unregister(&fw_dump);
 		break;
 	case 1:
 		if (fw_dump.dump_registered == 1) {
 			/* Un-register Firmware-assisted dump */
-			fadump_unregister_dump(&fdm);
+			fw_dump.ops->fadump_unregister(&fw_dump);
 		}
 		/* Register Firmware-assisted dump */
 		ret = register_fadump();
@@ -1530,7 +1394,8 @@ static int fadump_region_show(struct seq_file *m, void *private)
 		fdm_ptr = fdm_active;
 	else {
 		mutex_unlock(&fadump_mutex);
-		fdm_ptr = &fdm;
+		fw_dump.ops->fadump_region_show(&fw_dump, m);
+		return 0;
 	}
 
 	seq_printf(m,
@@ -1651,7 +1516,7 @@ int __init setup_fadump(void)
 	}
 	/* Initialize the kernel dump memory structure for FAD registration. */
 	else if (fw_dump.reserve_dump_area_size)
-		init_fadump_mem_struct(&fdm, fw_dump.reserve_dump_area_start);
+		fw_dump.ops->fadump_init_mem_struct(&fw_dump);
 	fadump_init_files();
 
 	return 1;
diff --git a/arch/powerpc/platforms/pseries/rtas-fadump.c b/arch/powerpc/platforms/pseries/rtas-fadump.c
index 9efe7b1ac9cc..1daa29fddcaa 100644
--- a/arch/powerpc/platforms/pseries/rtas-fadump.c
+++ b/arch/powerpc/platforms/pseries/rtas-fadump.c
@@ -22,19 +22,151 @@
 
 #include "rtas-fadump.h"
 
+static struct rtas_fadump_mem_struct fdm;
+
+static void rtas_fadump_update_config(struct fw_dump *fadump_conf,
+				      const struct rtas_fadump_mem_struct *fdm)
+{
+	fadump_conf->boot_mem_dest_addr =
+		be64_to_cpu(fdm->rmr_region.destination_address);
+
+	fadump_conf->fadumphdr_addr = (fadump_conf->boot_mem_dest_addr +
+				       fadump_conf->boot_memory_size);
+}
+
 static u64 rtas_fadump_init_mem_struct(struct fw_dump *fadump_conf)
 {
-	return fadump_conf->reserve_dump_area_start;
+	u64 addr = fadump_conf->reserve_dump_area_start;
+
+	memset(&fdm, 0, sizeof(struct rtas_fadump_mem_struct));
+	addr = addr & PAGE_MASK;
+
+	fdm.header.dump_format_version = cpu_to_be32(0x00000001);
+	fdm.header.dump_num_sections = cpu_to_be16(3);
+	fdm.header.dump_status_flag = 0;
+	fdm.header.offset_first_dump_section =
+		cpu_to_be32((u32)offsetof(struct rtas_fadump_mem_struct,
+					  cpu_state_data));
+
+	/*
+	 * Fields for disk dump option.
+	 * We are not using disk dump option, hence set these fields to 0.
+	 */
+	fdm.header.dd_block_size = 0;
+	fdm.header.dd_block_offset = 0;
+	fdm.header.dd_num_blocks = 0;
+	fdm.header.dd_offset_disk_path = 0;
+
+	/* set 0 to disable an automatic dump-reboot. */
+	fdm.header.max_time_auto = 0;
+
+	/* Kernel dump sections */
+	/* cpu state data section. */
+	fdm.cpu_state_data.request_flag =
+		cpu_to_be32(RTAS_FADUMP_REQUEST_FLAG);
+	fdm.cpu_state_data.source_data_type =
+		cpu_to_be16(RTAS_FADUMP_CPU_STATE_DATA);
+	fdm.cpu_state_data.source_address = 0;
+	fdm.cpu_state_data.source_len =
+		cpu_to_be64(fadump_conf->cpu_state_data_size);
+	fdm.cpu_state_data.destination_address = cpu_to_be64(addr);
+	addr += fadump_conf->cpu_state_data_size;
+
+	/* hpte region section */
+	fdm.hpte_region.request_flag = cpu_to_be32(RTAS_FADUMP_REQUEST_FLAG);
+	fdm.hpte_region.source_data_type =
+		cpu_to_be16(RTAS_FADUMP_HPTE_REGION);
+	fdm.hpte_region.source_address = 0;
+	fdm.hpte_region.source_len =
+		cpu_to_be64(fadump_conf->hpte_region_size);
+	fdm.hpte_region.destination_address = cpu_to_be64(addr);
+	addr += fadump_conf->hpte_region_size;
+
+	/* RMA region section */
+	fdm.rmr_region.request_flag = cpu_to_be32(RTAS_FADUMP_REQUEST_FLAG);
+	fdm.rmr_region.source_data_type =
+		cpu_to_be16(RTAS_FADUMP_REAL_MODE_REGION);
+	fdm.rmr_region.source_address = cpu_to_be64(RMA_START);
+	fdm.rmr_region.source_len = cpu_to_be64(fadump_conf->boot_memory_size);
+	fdm.rmr_region.destination_address = cpu_to_be64(addr);
+	addr += fadump_conf->boot_memory_size;
+
+	rtas_fadump_update_config(fadump_conf, &fdm);
+
+	return addr;
 }
 
 static int rtas_fadump_register(struct fw_dump *fadump_conf)
 {
-	return -EIO;
+	unsigned int wait_time;
+	int rc, err = -EIO;
+
+	/* TODO: Add upper time limit for the delay */
+	do {
+		rc =  rtas_call(fadump_conf->ibm_configure_kernel_dump, 3, 1,
+				NULL, FADUMP_REGISTER, &fdm,
+				sizeof(struct rtas_fadump_mem_struct));
+
+		wait_time = rtas_busy_delay_time(rc);
+		if (wait_time)
+			mdelay(wait_time);
+
+	} while (wait_time);
+
+	switch (rc) {
+	case 0:
+		pr_info("Registration is successful!\n");
+		fadump_conf->dump_registered = 1;
+		err = 0;
+		break;
+	case -1:
+		pr_err("Failed to register. Hardware Error(%d).\n", rc);
+		break;
+	case -3:
+		if (!is_fadump_boot_mem_contiguous())
+			pr_err("Can't have holes in boot memory area.\n");
+		else if (!is_fadump_reserved_mem_contiguous())
+			pr_err("Can't have holes in reserved memory area.\n");
+
+		pr_err("Failed to register. Parameter Error(%d).\n", rc);
+		err = -EINVAL;
+		break;
+	case -9:
+		pr_err("Already registered!\n");
+		fadump_conf->dump_registered = 1;
+		err = -EEXIST;
+		break;
+	default:
+		pr_err("Failed to register. Unknown Error(%d).\n", rc);
+		break;
+	}
+
+	return err;
 }
 
 static int rtas_fadump_unregister(struct fw_dump *fadump_conf)
 {
-	return -EIO;
+	unsigned int wait_time;
+	int rc;
+
+	/* TODO: Add upper time limit for the delay */
+	do {
+		rc =  rtas_call(fadump_conf->ibm_configure_kernel_dump, 3, 1,
+				NULL, FADUMP_UNREGISTER, &fdm,
+				sizeof(struct rtas_fadump_mem_struct));
+
+		wait_time = rtas_busy_delay_time(rc);
+		if (wait_time)
+			mdelay(wait_time);
+	} while (wait_time);
+
+	if (rc) {
+		pr_err("Failed to un-register - unexpected error(%d).\n", rc);
+		return -EIO;
+	}
+
+	fadump_conf->dump_registered = 0;
+	return 0;
 }
 
 static int rtas_fadump_invalidate(struct fw_dump *fadump_conf)
@@ -54,6 +186,30 @@ static int __init rtas_fadump_process(struct fw_dump *fadump_conf)
 static void rtas_fadump_region_show(struct fw_dump *fadump_conf,
 				    struct seq_file *m)
 {
+	const struct rtas_fadump_mem_struct *fdm_ptr = &fdm;
+	const struct rtas_fadump_section *cpu_data_section;
+
+	cpu_data_section = &(fdm_ptr->cpu_state_data);
+	seq_printf(m, "CPU :[%#016llx-%#016llx] %#llx bytes, Dumped: %#llx\n",
+		   be64_to_cpu(cpu_data_section->destination_address),
+		   be64_to_cpu(cpu_data_section->destination_address) +
+		   be64_to_cpu(cpu_data_section->source_len) - 1,
+		   be64_to_cpu(cpu_data_section->source_len),
+		   be64_to_cpu(cpu_data_section->bytes_dumped));
+
+	seq_printf(m, "HPTE:[%#016llx-%#016llx] %#llx bytes, Dumped: %#llx\n",
+		   be64_to_cpu(fdm_ptr->hpte_region.destination_address),
+		   be64_to_cpu(fdm_ptr->hpte_region.destination_address) +
+		   be64_to_cpu(fdm_ptr->hpte_region.source_len) - 1,
+		   be64_to_cpu(fdm_ptr->hpte_region.source_len),
+		   be64_to_cpu(fdm_ptr->hpte_region.bytes_dumped));
+
+	seq_printf(m, "DUMP: [%#016llx-%#016llx] %#llx bytes, Dumped: %#llx\n",
+		   be64_to_cpu(fdm_ptr->rmr_region.destination_address),
+		   be64_to_cpu(fdm_ptr->rmr_region.destination_address) +
+		   be64_to_cpu(fdm_ptr->rmr_region.source_len) - 1,
+		   be64_to_cpu(fdm_ptr->rmr_region.source_len),
+		   be64_to_cpu(fdm_ptr->rmr_region.bytes_dumped));
 }
 
 static void rtas_fadump_trigger(struct fadump_crash_info_header *fdh,