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authorHeiko Carstens <heiko.carstens@de.ibm.com>2016-12-03 11:48:01 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-12-07 09:23:07 +0300
commitaf51160ebd3cc1c8bf0d37a48f13ac0dbe8a6e5f (patch)
tree40771af138b90c55d7baa36c5257fbe16ddd5572
parentebb299a51059017ec253bd30781a83d1f6e11b24 (diff)
downloadlinux-af51160ebd3cc1c8bf0d37a48f13ac0dbe8a6e5f.tar.xz
s390/smp: initialize cpu_present_mask in setup_arch
In order to be able to setup the cpu to node mappings early it is a prerequisite to know which cpus are present. Therefore cpus must be detected much earlier than before. For sclp based cpu detection this requires yet another early sclp call, since the system is not ready to use the regular interrupt and memory allocations. Reviewed-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--arch/s390/include/asm/sclp.h10
-rw-r--r--arch/s390/include/asm/smp.h2
-rw-r--r--arch/s390/kernel/setup.c1
-rw-r--r--arch/s390/kernel/smp.c22
-rw-r--r--drivers/s390/char/sclp.h23
-rw-r--r--drivers/s390/char/sclp_cmd.c25
-rw-r--r--drivers/s390/char/sclp_early.c31
7 files changed, 76 insertions, 38 deletions
diff --git a/arch/s390/include/asm/sclp.h b/arch/s390/include/asm/sclp.h
index 2ad9c204b1a2..8db92a5b3bf1 100644
--- a/arch/s390/include/asm/sclp.h
+++ b/arch/s390/include/asm/sclp.h
@@ -101,7 +101,8 @@ struct zpci_report_error_header {
u8 data[0]; /* Subsequent Data passed verbatim to SCLP ET 24 */
} __packed;
-int sclp_get_core_info(struct sclp_core_info *info);
+int _sclp_get_core_info_early(struct sclp_core_info *info);
+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);
@@ -119,4 +120,11 @@ void sclp_early_detect(void);
void _sclp_print_early(const char *);
void sclp_ocf_cpc_name_copy(char *dst);
+static inline int sclp_get_core_info(struct sclp_core_info *info, int early)
+{
+ if (early)
+ return _sclp_get_core_info_early(info);
+ return _sclp_get_core_info(info);
+}
+
#endif /* _ASM_S390_SCLP_H */
diff --git a/arch/s390/include/asm/smp.h b/arch/s390/include/asm/smp.h
index 8116b7b63af3..3deb134587b7 100644
--- a/arch/s390/include/asm/smp.h
+++ b/arch/s390/include/asm/smp.h
@@ -36,6 +36,7 @@ extern void smp_yield_cpu(int cpu);
extern void smp_cpu_set_polarization(int cpu, int val);
extern int smp_cpu_get_polarization(int cpu);
extern void smp_fill_possible_mask(void);
+extern void smp_detect_cpus(void);
#else /* CONFIG_SMP */
@@ -56,6 +57,7 @@ static inline int smp_store_status(int cpu) { return 0; }
static inline int smp_vcpu_scheduled(int cpu) { return 1; }
static inline void smp_yield_cpu(int cpu) { }
static inline void smp_fill_possible_mask(void) { }
+static inline void smp_detect_cpus(void) { }
#endif /* CONFIG_SMP */
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index b57e28f1edc2..aba3c5ce1559 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -923,6 +923,7 @@ void __init setup_arch(char **cmdline_p)
cpu_detect_mhz_feature();
cpu_init();
numa_setup();
+ smp_detect_cpus();
/*
* Create kernel page tables and switch to virtual addressing.
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 66ffc2350f24..5d53ab646b3f 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -19,6 +19,7 @@
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/workqueue.h>
+#include <linux/bootmem.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mm.h>
@@ -655,14 +656,12 @@ int smp_cpu_get_polarization(int cpu)
return pcpu_devices[cpu].polarization;
}
-static struct sclp_core_info *smp_get_core_info(void)
+static void __ref smp_get_core_info(struct sclp_core_info *info, int early)
{
static int use_sigp_detection;
- struct sclp_core_info *info;
int address;
- info = kzalloc(sizeof(*info), GFP_KERNEL);
- if (info && (use_sigp_detection || sclp_get_core_info(info))) {
+ if (use_sigp_detection || sclp_get_core_info(info, early)) {
use_sigp_detection = 1;
for (address = 0;
address < (SCLP_MAX_CORES << smp_cpu_mt_shift);
@@ -676,7 +675,6 @@ static struct sclp_core_info *smp_get_core_info(void)
}
info->combined = info->configured;
}
- return info;
}
static int smp_add_present_cpu(int cpu);
@@ -717,17 +715,15 @@ static int __smp_rescan_cpus(struct sclp_core_info *info, int sysfs_add)
return nr;
}
-static void __init smp_detect_cpus(void)
+void __init smp_detect_cpus(void)
{
unsigned int cpu, mtid, c_cpus, s_cpus;
struct sclp_core_info *info;
u16 address;
/* Get CPU information */
- info = smp_get_core_info();
- if (!info)
- panic("smp_detect_cpus failed to allocate memory\n");
-
+ info = memblock_virt_alloc(sizeof(*info), 8);
+ smp_get_core_info(info, 1);
/* Find boot CPU type */
if (sclp.has_core_type) {
address = stap();
@@ -763,7 +759,7 @@ static void __init smp_detect_cpus(void)
get_online_cpus();
__smp_rescan_cpus(info, 0);
put_online_cpus();
- kfree(info);
+ memblock_free_early((unsigned long)info, sizeof(*info));
}
/*
@@ -900,7 +896,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
/* request the 0x1202 external call external interrupt */
if (register_external_irq(EXT_IRQ_EXTERNAL_CALL, do_ext_call_interrupt))
panic("Couldn't request external interrupt 0x1202");
- smp_detect_cpus();
}
void __init smp_prepare_boot_cpu(void)
@@ -1111,9 +1106,10 @@ int __ref smp_rescan_cpus(void)
struct sclp_core_info *info;
int nr;
- info = smp_get_core_info();
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
+ smp_get_core_info(info, 0);
get_online_cpus();
mutex_lock(&smp_cpu_state_mutex);
nr = __smp_rescan_cpus(info, 1);
diff --git a/drivers/s390/char/sclp.h b/drivers/s390/char/sclp.h
index 7a10c56334bb..e1fc7eb043d6 100644
--- a/drivers/s390/char/sclp.h
+++ b/drivers/s390/char/sclp.h
@@ -59,6 +59,7 @@
typedef unsigned int sclp_cmdw_t;
+#define SCLP_CMDW_READ_CPU_INFO 0x00010001
#define SCLP_CMDW_READ_EVENT_DATA 0x00770005
#define SCLP_CMDW_WRITE_EVENT_DATA 0x00760005
#define SCLP_CMDW_WRITE_EVENT_MASK 0x00780005
@@ -102,6 +103,28 @@ struct init_sccb {
sccb_mask_t sclp_send_mask;
} __attribute__((packed));
+struct read_cpu_info_sccb {
+ struct sccb_header header;
+ u16 nr_configured;
+ u16 offset_configured;
+ u16 nr_standby;
+ u16 offset_standby;
+ u8 reserved[4096 - 16];
+} __attribute__((packed, aligned(PAGE_SIZE)));
+
+static inline void sclp_fill_core_info(struct sclp_core_info *info,
+ struct read_cpu_info_sccb *sccb)
+{
+ char *page = (char *) sccb;
+
+ memset(info, 0, sizeof(*info));
+ info->configured = sccb->nr_configured;
+ info->standby = sccb->nr_standby;
+ info->combined = sccb->nr_configured + sccb->nr_standby;
+ memcpy(&info->core, page + sccb->offset_configured,
+ info->combined * sizeof(struct sclp_core_entry));
+}
+
#define SCLP_HAS_CHP_INFO (sclp.facilities & 0x8000000000000000ULL)
#define SCLP_HAS_CHP_RECONFIG (sclp.facilities & 0x2000000000000000ULL)
#define SCLP_HAS_CPU_INFO (sclp.facilities & 0x0800000000000000ULL)
diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c
index e3fc7539116b..b9c5522b8a68 100644
--- a/drivers/s390/char/sclp_cmd.c
+++ b/drivers/s390/char/sclp_cmd.c
@@ -80,33 +80,10 @@ out:
* CPU configuration related functions.
*/
-#define SCLP_CMDW_READ_CPU_INFO 0x00010001
#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
-struct read_cpu_info_sccb {
- struct sccb_header header;
- u16 nr_configured;
- u16 offset_configured;
- u16 nr_standby;
- u16 offset_standby;
- u8 reserved[4096 - 16];
-} __attribute__((packed, aligned(PAGE_SIZE)));
-
-static void sclp_fill_core_info(struct sclp_core_info *info,
- struct read_cpu_info_sccb *sccb)
-{
- char *page = (char *) sccb;
-
- memset(info, 0, sizeof(*info));
- info->configured = sccb->nr_configured;
- info->standby = sccb->nr_standby;
- info->combined = sccb->nr_configured + sccb->nr_standby;
- memcpy(&info->core, page + sccb->offset_configured,
- info->combined * sizeof(struct sclp_core_entry));
-}
-
-int sclp_get_core_info(struct sclp_core_info *info)
+int _sclp_get_core_info(struct sclp_core_info *info)
{
int rc;
struct read_cpu_info_sccb *sccb;
diff --git a/drivers/s390/char/sclp_early.c b/drivers/s390/char/sclp_early.c
index c71df0c7dedc..f8e46c22e641 100644
--- a/drivers/s390/char/sclp_early.c
+++ b/drivers/s390/char/sclp_early.c
@@ -221,6 +221,36 @@ static int __init sclp_set_event_mask(struct init_sccb *sccb,
return sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb);
}
+static struct sclp_core_info sclp_core_info_early __initdata;
+static int sclp_core_info_early_valid __initdata;
+
+static void __init sclp_init_core_info_early(struct read_cpu_info_sccb *sccb)
+{
+ int rc;
+
+ if (!SCLP_HAS_CPU_INFO)
+ return;
+ memset(sccb, 0, sizeof(*sccb));
+ sccb->header.length = sizeof(*sccb);
+ do {
+ rc = sclp_cmd_sync_early(SCLP_CMDW_READ_CPU_INFO, sccb);
+ } while (rc == -EBUSY);
+ if (rc)
+ return;
+ if (sccb->header.response_code != 0x0010)
+ return;
+ sclp_fill_core_info(&sclp_core_info_early, sccb);
+ sclp_core_info_early_valid = 1;
+}
+
+int __init _sclp_get_core_info_early(struct sclp_core_info *info)
+{
+ if (!sclp_core_info_early_valid)
+ return -EIO;
+ *info = sclp_core_info_early;
+ return 0;
+}
+
static long __init sclp_hsa_size_init(struct sdias_sccb *sccb)
{
sccb_init_eq_size(sccb);
@@ -293,6 +323,7 @@ void __init sclp_early_detect(void)
void *sccb = &sccb_early;
sclp_facilities_detect(sccb);
+ sclp_init_core_info_early(sccb);
sclp_hsa_size_detect(sccb);
/* Turn off SCLP event notifications. Also save remote masks in the