[S390] sclp: introduce some new interfaces.
Introduce some new interfaces so that random subsystems don't have to
mess around with sclp internal structures.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/char/sclp_info.c b/drivers/s390/char/sclp_info.c
index 7bcbe64..7d21dbb 100644
--- a/drivers/s390/char/sclp_info.c
+++ b/drivers/s390/char/sclp_info.c
@@ -11,47 +11,97 @@
#include <asm/sclp.h>
#include "sclp.h"
-struct sclp_readinfo_sccb s390_readinfo_sccb;
+struct sclp_readinfo_sccb {
+ struct sccb_header header; /* 0-7 */
+ u16 rnmax; /* 8-9 */
+ u8 rnsize; /* 10 */
+ u8 _reserved0[24 - 11]; /* 11-23 */
+ u8 loadparm[8]; /* 24-31 */
+ u8 _reserved1[48 - 32]; /* 32-47 */
+ u64 facilities; /* 48-55 */
+ u8 _reserved2[91 - 56]; /* 56-90 */
+ u8 flags; /* 91 */
+ u8 _reserved3[100 - 92]; /* 92-99 */
+ u32 rnsize2; /* 100-103 */
+ u64 rnmax2; /* 104-111 */
+ u8 _reserved4[4096 - 112]; /* 112-4095 */
+} __attribute__((packed, aligned(4096)));
+
+static struct sclp_readinfo_sccb __initdata early_readinfo_sccb;
+static int __initdata early_readinfo_sccb_valid;
void __init sclp_readinfo_early(void)
{
- sclp_cmdw_t command;
- struct sccb_header *sccb;
int ret;
+ int i;
+ struct sclp_readinfo_sccb *sccb;
+ sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
+ SCLP_CMDW_READ_SCP_INFO};
- __ctl_set_bit(0, 9); /* enable service signal subclass mask */
+ /* Enable service signal subclass mask. */
+ __ctl_set_bit(0, 9);
+ sccb = &early_readinfo_sccb;
+ for (i = 0; i < ARRAY_SIZE(commands); i++) {
+ do {
+ memset(sccb, 0, sizeof(*sccb));
+ sccb->header.length = sizeof(*sccb);
+ sccb->header.control_mask[2] = 0x80;
+ ret = sclp_service_call(commands[i], sccb);
+ } while (ret == -EBUSY);
- sccb = &s390_readinfo_sccb.header;
- command = SCLP_CMDW_READ_SCP_INFO_FORCED;
- while (1) {
- u16 response;
-
- memset(&s390_readinfo_sccb, 0, sizeof(s390_readinfo_sccb));
- sccb->length = sizeof(s390_readinfo_sccb);
- sccb->control_mask[2] = 0x80;
-
- ret = sclp_service_call(command, &s390_readinfo_sccb);
-
- if (ret == -EIO)
- goto out;
- if (ret == -EBUSY)
- continue;
-
+ if (ret)
+ break;
__load_psw_mask(PSW_BASE_BITS | PSW_MASK_EXT |
PSW_MASK_WAIT | PSW_DEFAULT_KEY);
local_irq_disable();
+ /*
+ * Contents of the sccb might have changed
+ * therefore a barrier is needed.
+ */
barrier();
-
- response = sccb->response_code;
-
- if (response == 0x10)
+ if (sccb->header.response_code == 0x10) {
+ early_readinfo_sccb_valid = 1;
break;
-
- if (response != 0x1f0 || command == SCLP_CMDW_READ_SCP_INFO)
+ }
+ if (sccb->header.response_code != 0x1f0)
break;
-
- command = SCLP_CMDW_READ_SCP_INFO;
}
-out:
- __ctl_clear_bit(0, 9); /* disable service signal subclass mask */
+ /* Disable service signal subclass mask again. */
+ __ctl_clear_bit(0, 9);
+}
+
+unsigned long long __init sclp_memory_detect(void)
+{
+ unsigned long long memsize;
+ struct sclp_readinfo_sccb *sccb;
+
+ if (!early_readinfo_sccb_valid)
+ return 0;
+ sccb = &early_readinfo_sccb;
+ if (sccb->rnsize)
+ memsize = sccb->rnsize << 20;
+ else
+ memsize = sccb->rnsize2 << 20;
+ if (sccb->rnmax)
+ memsize *= sccb->rnmax;
+ else
+ memsize *= sccb->rnmax2;
+ return memsize;
+}
+
+/*
+ * This function will be called after sclp_memory_detect(), which gets called
+ * early from early.c code. Therefore the sccb should have valid contents.
+ */
+void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
+{
+ struct sclp_readinfo_sccb *sccb;
+
+ if (!early_readinfo_sccb_valid)
+ return;
+ sccb = &early_readinfo_sccb;
+ info->is_valid = 1;
+ if (sccb->flags & 0x2)
+ info->has_dump = 1;
+ memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
}