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

1 files changed, 15 insertions, 150 deletions

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;