s390/smp: cleanup core vs. cpu in the SCLP interface

The SCLP interface to query, configure and deconfigure CPUs actually
operates on cores. For a machine without the multi-threading faciltiy
a CPU and a core are equivalent but starting with System z13 a core
can have multiple hardware threads, also referred to as logical CPUs.

To avoid confusion replace the word 'cpu' with 'core' in the SCLP
interface. Also replace MAX_CPU_ADDRESS with SCLP_MAX_CORES.
The core-id is an 8-bit field, the maximum thread id is in the range
0-31. The theoretical limit for the CPU address is therefore 8191.

Signed-off-by: Martin Schwidefsky <[e-mail]>

arch/s390/include/asm/cpu.h

···
 #ifndef _ASM_S390_CPU_H
 #define _ASM_S390_CPU_H
 
-#define MAX_CPU_ADDRESS 255
-
 #ifndef __ASSEMBLY__
 
 #include <linux/types.h>

arch/s390/include/asm/sclp.h

···
 #include <asm/cpu.h>
 
 #define SCLP_CHP_INFO_MASK_SIZE		32
+#define SCLP_MAX_CORES			256
 
 struct sclp_chp_info {
 	u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
···
 	char loadparm[LOADPARM_LEN];
 };
 
-struct sclp_cpu_entry {
+struct sclp_core_entry {
 	u8 core_id;
 	u8 reserved0[2];
 	u8 : 3;
···
 	u8 reserved1;
 } __attribute__((packed));
 
-struct sclp_cpu_info {
+struct sclp_core_info {
 	unsigned int configured;
 	unsigned int standby;
 	unsigned int combined;
-	int has_cpu_type;
-	struct sclp_cpu_entry cpu[MAX_CPU_ADDRESS + 1];
+	struct sclp_core_entry core[SCLP_MAX_CORES];
 };
 
 struct sclp_info {
···
 	unsigned char has_vt220 : 1;
 	unsigned char has_siif : 1;
 	unsigned char has_sigpif : 1;
-	unsigned char has_cpu_type : 1;
+	unsigned char has_core_type : 1;
 	unsigned char has_sprp : 1;
 	unsigned int ibc;
 	unsigned int mtid;
···
 	unsigned long long rzm;
 	unsigned long long rnmax;
 	unsigned long long hamax;
-	unsigned int max_cpu;
+	unsigned int max_cores;
 	unsigned long hsa_size;
 	unsigned long long facilities;
 };
 extern struct sclp_info sclp;
 
-int sclp_get_cpu_info(struct sclp_cpu_info *info);
-int sclp_cpu_configure(u8 cpu);
-int sclp_cpu_deconfigure(u8 cpu);
+int sclp_get_core_info(struct sclp_core_info *info);
+int sclp_core_configure(u8 core);
+int sclp_core_deconfigure(u8 core);
 int sclp_sdias_blk_count(void);
 int sclp_sdias_copy(void *dest, int blk_num, int nr_blks);
 int sclp_chp_configure(struct chp_id chpid);

arch/s390/kernel/smp.c

···
 	u16 address;			/* physical cpu address */
 };
 
-static u8 boot_cpu_type;
+static u8 boot_core_type;
 static struct pcpu pcpu_devices[NR_CPUS];
 
 unsigned int smp_cpu_mt_shift;
···
  *    old system. The ELF sections are picked up by the crash_dump code
  *    via elfcorehdr_addr.
  */
-static void __init smp_store_cpu_states(struct sclp_cpu_info *info)
+static void __init smp_store_cpu_states(struct sclp_core_info *info)
 {
 	unsigned int cpu, address, i, j;
 	int is_boot_cpu;
···
 	cpu = 0;
 	for (i = 0; i < info->configured; i++) {
 		/* Skip CPUs with different CPU type. */
-		if (info->has_cpu_type && info->cpu[i].type != boot_cpu_type)
+		if (sclp.has_core_type && info->core[i].type != boot_core_type)
 			continue;
 		for (j = 0; j <= smp_cpu_mtid; j++, cpu++) {
-			address = (info->cpu[i].core_id << smp_cpu_mt_shift) + j;
+			address = (info->core[i].core_id << smp_cpu_mt_shift) + j;
 			is_boot_cpu = (address == pcpu_devices[0].address);
 			if (is_boot_cpu && !OLDMEM_BASE)
 				/* Skip boot CPU for standard zfcp dump. */
···
 	return pcpu_devices[cpu].polarization;
 }
 
-static struct sclp_cpu_info *smp_get_cpu_info(void)
+static struct sclp_core_info *smp_get_core_info(void)
 {
 	static int use_sigp_detection;
-	struct sclp_cpu_info *info;
+	struct sclp_core_info *info;
 	int address;
 
 	info = kzalloc(sizeof(*info), GFP_KERNEL);
-	if (info && (use_sigp_detection || sclp_get_cpu_info(info))) {
+	if (info && (use_sigp_detection || sclp_get_core_info(info))) {
 		use_sigp_detection = 1;
 		for (address = 0;
-		     address <= (MAX_CPU_ADDRESS << smp_cpu_mt_shift);
+		     address < (SCLP_MAX_CORES << smp_cpu_mt_shift);
 		     address += (1U << smp_cpu_mt_shift)) {
 			if (__pcpu_sigp_relax(address, SIGP_SENSE, 0, NULL) ==
 			    SIGP_CC_NOT_OPERATIONAL)
 				continue;
-			info->cpu[info->configured].core_id =
+			info->core[info->configured].core_id =
 				address >> smp_cpu_mt_shift;
 			info->configured++;
 		}
···
 
 static int smp_add_present_cpu(int cpu);
 
-static int __smp_rescan_cpus(struct sclp_cpu_info *info, int sysfs_add)
+static int __smp_rescan_cpus(struct sclp_core_info *info, int sysfs_add)
 {
 	struct pcpu *pcpu;
 	cpumask_t avail;
···
 	cpumask_xor(&avail, cpu_possible_mask, cpu_present_mask);
 	cpu = cpumask_first(&avail);
 	for (i = 0; (i < info->combined) && (cpu < nr_cpu_ids); i++) {
-		if (info->has_cpu_type && info->cpu[i].type != boot_cpu_type)
+		if (sclp.has_core_type && info->core[i].type != boot_core_type)
 			continue;
-		address = info->cpu[i].core_id << smp_cpu_mt_shift;
+		address = info->core[i].core_id << smp_cpu_mt_shift;
 		for (j = 0; j <= smp_cpu_mtid; j++) {
 			if (pcpu_find_address(cpu_present_mask, address + j))
 				continue;
···
 static void __init smp_detect_cpus(void)
 {
 	unsigned int cpu, mtid, c_cpus, s_cpus;
-	struct sclp_cpu_info *info;
+	struct sclp_core_info *info;
 	u16 address;
 
 	/* Get CPU information */
-	info = smp_get_cpu_info();
+	info = smp_get_core_info();
 	if (!info)
 		panic("smp_detect_cpus failed to allocate memory\n");
 
 	/* Find boot CPU type */
-	if (info->has_cpu_type) {
+	if (sclp.has_core_type) {
 		address = stap();
 		for (cpu = 0; cpu < info->combined; cpu++)
-			if (info->cpu[cpu].core_id == address) {
+			if (info->core[cpu].core_id == address) {
 				/* The boot cpu dictates the cpu type. */
-				boot_cpu_type = info->cpu[cpu].type;
+				boot_core_type = info->core[cpu].type;
 				break;
 			}
 		if (cpu >= info->combined)
···
 #endif
 
 	/* Set multi-threading state for the current system */
-	mtid = boot_cpu_type ? sclp.mtid : sclp.mtid_cp;
+	mtid = boot_core_type ? sclp.mtid : sclp.mtid_cp;
 	mtid = (mtid < smp_max_threads) ? mtid : smp_max_threads - 1;
 	pcpu_set_smt(mtid);
 
 	/* Print number of CPUs */
 	c_cpus = s_cpus = 0;
 	for (cpu = 0; cpu < info->combined; cpu++) {
-		if (info->has_cpu_type && info->cpu[cpu].type != boot_cpu_type)
+		if (sclp.has_core_type &&
+		    info->core[cpu].type != boot_core_type)
 			continue;
 		if (cpu < info->configured)
 			c_cpus += smp_cpu_mtid + 1;
···
 
 	sclp_max = max(sclp.mtid, sclp.mtid_cp) + 1;
 	sclp_max = min(smp_max_threads, sclp_max);
-	sclp_max = sclp.max_cpu * sclp_max ?: nr_cpu_ids;
+	sclp_max = sclp.max_cores * sclp_max ?: nr_cpu_ids;
 	possible = setup_possible_cpus ?: nr_cpu_ids;
 	possible = min(possible, sclp_max);
 	for (cpu = 0; cpu < possible && cpu < nr_cpu_ids; cpu++)
···
 	case 0:
 		if (pcpu->state != CPU_STATE_CONFIGURED)
 			break;
-		rc = sclp_cpu_deconfigure(pcpu->address >> smp_cpu_mt_shift);
+		rc = sclp_core_deconfigure(pcpu->address >> smp_cpu_mt_shift);
 		if (rc)
 			break;
 		for (i = 0; i <= smp_cpu_mtid; i++) {
···
 	case 1:
 		if (pcpu->state != CPU_STATE_STANDBY)
 			break;
-		rc = sclp_cpu_configure(pcpu->address >> smp_cpu_mt_shift);
+		rc = sclp_core_configure(pcpu->address >> smp_cpu_mt_shift);
 		if (rc)
 			break;
 		for (i = 0; i <= smp_cpu_mtid; i++) {
···
 
 int __ref smp_rescan_cpus(void)
 {
-	struct sclp_cpu_info *info;
+	struct sclp_core_info *info;
 	int nr;
 
-	info = smp_get_cpu_info();
+	info = smp_get_core_info();
 	if (!info)
 		return -ENOMEM;
 	get_online_cpus();

drivers/s390/char/sclp_cmd.c

···
 	u8	reserved[4096 - 16];
 } __attribute__((packed, aligned(PAGE_SIZE)));
 
-static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
-			       struct read_cpu_info_sccb *sccb)
+static void sclp_fill_core_info(struct sclp_core_info *info,
+				struct read_cpu_info_sccb *sccb)
 {
 	char *page = (char *) sccb;
 
···
 	info->configured = sccb->nr_configured;
 	info->standby = sccb->nr_standby;
 	info->combined = sccb->nr_configured + sccb->nr_standby;
-	info->has_cpu_type = sclp.has_cpu_type;
-	memcpy(&info->cpu, page + sccb->offset_configured,
-	       info->combined * sizeof(struct sclp_cpu_entry));
+	memcpy(&info->core, page + sccb->offset_configured,
+	       info->combined * sizeof(struct sclp_core_entry));
 }
 
-int sclp_get_cpu_info(struct sclp_cpu_info *info)
+int sclp_get_core_info(struct sclp_core_info *info)
 {
 	int rc;
 	struct read_cpu_info_sccb *sccb;
···
 		rc = -EIO;
 		goto out;
 	}
-	sclp_fill_cpu_info(info, sccb);
+	sclp_fill_core_info(info, sccb);
 out:
 	free_page((unsigned long) sccb);
 	return rc;
···
 	struct sccb_header header;
 } __attribute__((packed, aligned(8)));
 
-static int do_cpu_configure(sclp_cmdw_t cmd)
+static int do_core_configure(sclp_cmdw_t cmd)
 {
 	struct cpu_configure_sccb *sccb;
 	int rc;
···
 	return rc;
 }
 
-int sclp_cpu_configure(u8 cpu)
+int sclp_core_configure(u8 core)
 {
-	return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8);
+	return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
 }
 
-int sclp_cpu_deconfigure(u8 cpu)
+int sclp_core_deconfigure(u8 core)
 {
-	return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8);
+	return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8);
 }
 
 #ifdef CONFIG_MEMORY_HOTPLUG

drivers/s390/char/sclp_early.c

···
 
 static void __init sclp_facilities_detect(struct read_info_sccb *sccb)
 {
-	struct sclp_cpu_entry *cpue;
+	struct sclp_core_entry *cpue;
 	u16 boot_cpu_address, cpu;
 
 	if (sclp_read_info_early(sccb))
···
 
 	sclp.facilities = sccb->facilities;
 	sclp.has_sprp = !!(sccb->fac84 & 0x02);
-	sclp.has_cpu_type = !!(sccb->fac84 & 0x01);
+	sclp.has_core_type = !!(sccb->fac84 & 0x01);
 	if (sccb->fac85 & 0x02)
 		S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
 	sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
···
 
 	if (!sccb->hcpua) {
 		if (MACHINE_IS_VM)
-			sclp.max_cpu = 64;
+			sclp.max_cores = 64;
 		else
-			sclp.max_cpu = sccb->ncpurl;
+			sclp.max_cores = sccb->ncpurl;
 	} else {
-		sclp.max_cpu = sccb->hcpua + 1;
+		sclp.max_cores = sccb->hcpua + 1;
 	}
 
 	boot_cpu_address = stap();