--- /dev/null
+/*
+ * SCLP early driver
+ *
+ * Copyright IBM Corp. 2013
+ */
+
+#define KMSG_COMPONENT "sclp_early"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <asm/ctl_reg.h>
+#include <asm/sclp.h>
+#include <asm/ipl.h>
+#include "sclp_sdias.h"
+#include "sclp.h"
+
+#define SCLP_CMDW_READ_SCP_INFO 0x00020001
+#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
+
+struct read_info_sccb {
+ struct sccb_header header; /* 0-7 */
+ u16 rnmax; /* 8-9 */
+ u8 rnsize; /* 10 */
+ u8 _pad_11[16 - 11]; /* 11-15 */
+ u16 ncpurl; /* 16-17 */
+ u16 cpuoff; /* 18-19 */
+ u8 _pad_20[24 - 20]; /* 20-23 */
+ u8 loadparm[8]; /* 24-31 */
+ u8 _pad_32[42 - 32]; /* 32-41 */
+ u8 fac42; /* 42 */
+ u8 fac43; /* 43 */
+ u8 _pad_44[48 - 44]; /* 44-47 */
+ u64 facilities; /* 48-55 */
+ u8 _pad_56[66 - 56]; /* 56-65 */
+ u8 fac66; /* 66 */
+ u8 _pad_67[76 - 67]; /* 67-83 */
+ u32 ibc; /* 76-79 */
+ u8 _pad80[84 - 80]; /* 80-83 */
+ u8 fac84; /* 84 */
+ u8 fac85; /* 85 */
+ u8 _pad_86[91 - 86]; /* 86-90 */
+ u8 flags; /* 91 */
+ u8 _pad_92[100 - 92]; /* 92-99 */
+ u32 rnsize2; /* 100-103 */
+ u64 rnmax2; /* 104-111 */
+ u8 _pad_112[120 - 112]; /* 112-119 */
+ u16 hcpua; /* 120-121 */
+ u8 _pad_122[4096 - 122]; /* 122-4095 */
+} __packed __aligned(PAGE_SIZE);
+
+static char sccb_early[PAGE_SIZE] __aligned(PAGE_SIZE) __initdata;
+static unsigned int sclp_con_has_vt220 __initdata;
+static unsigned int sclp_con_has_linemode __initdata;
+static unsigned long sclp_hsa_size;
+static unsigned int sclp_max_cpu;
+static struct sclp_ipl_info sclp_ipl_info;
+static unsigned char sclp_siif;
+static unsigned char sclp_sigpif;
+static u32 sclp_ibc;
+static unsigned int sclp_mtid;
+static unsigned int sclp_mtid_cp;
+static unsigned int sclp_mtid_max;
+static unsigned int sclp_mtid_prev;
+
+u64 sclp_facilities;
+u8 sclp_fac84;
+unsigned long long sclp_rzm;
+unsigned long long sclp_rnmax;
+
+static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
+{
+ int rc;
+
+ __ctl_set_bit(0, 9);
+ rc = sclp_service_call(cmd, sccb);
+ if (rc)
+ goto out;
+ __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA |
+ PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT);
+ local_irq_disable();
+out:
+ /* Contents of the sccb might have changed. */
+ barrier();
+ __ctl_clear_bit(0, 9);
+ return rc;
+}
+
+static int __init sclp_read_info_early(struct read_info_sccb *sccb)
+{
+ int rc, i;
+ sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
+ SCLP_CMDW_READ_SCP_INFO};
+
+ for (i = 0; i < ARRAY_SIZE(commands); i++) {
+ do {
+ memset(sccb, 0, sizeof(*sccb));
+ sccb->header.length = sizeof(*sccb);
+ sccb->header.function_code = 0x80;
+ sccb->header.control_mask[2] = 0x80;
+ rc = sclp_cmd_sync_early(commands[i], sccb);
+ } while (rc == -EBUSY);
+
+ if (rc)
+ break;
+ if (sccb->header.response_code == 0x10)
+ return 0;
+ if (sccb->header.response_code != 0x1f0)
+ break;
+ }
+ return -EIO;
+}
+
+static void __init sclp_facilities_detect(struct read_info_sccb *sccb)
+{
+ struct sclp_cpu_entry *cpue;
+ u16 boot_cpu_address, cpu;
+
+ if (sclp_read_info_early(sccb))
+ return;
+
+ sclp_facilities = sccb->facilities;
+ sclp_fac84 = sccb->fac84;
+ if (sccb->fac85 & 0x02)
+ S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
+ sclp_rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
+ sclp_rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
+ sclp_rzm <<= 20;
+ sclp_ibc = sccb->ibc;
+
+ if (!sccb->hcpua) {
+ if (MACHINE_IS_VM)
+ sclp_max_cpu = 64;
+ else
+ sclp_max_cpu = sccb->ncpurl;
+ } else {
+ sclp_max_cpu = sccb->hcpua + 1;
+ }
+
+ boot_cpu_address = stap();
+ cpue = (void *)sccb + sccb->cpuoff;
+ for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) {
+ if (boot_cpu_address != cpue->core_id)
+ continue;
+ sclp_siif = cpue->siif;
+ sclp_sigpif = cpue->sigpif;
+ break;
+ }
+
+ /* Save IPL information */
+ sclp_ipl_info.is_valid = 1;
+ if (sccb->flags & 0x2)
+ sclp_ipl_info.has_dump = 1;
+ memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);
+
+ sclp_mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0;
+ sclp_mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0;
+ sclp_mtid_max = max(sclp_mtid, sclp_mtid_cp);
+ sclp_mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
+}
+
+bool __init sclp_has_linemode(void)
+{
+ return !!sclp_con_has_linemode;
+}
+
+bool __init sclp_has_vt220(void)
+{
+ return !!sclp_con_has_vt220;
+}
+
+unsigned long long sclp_get_rnmax(void)
+{
+ return sclp_rnmax;
+}
+
+unsigned long long sclp_get_rzm(void)
+{
+ return sclp_rzm;
+}
+
+unsigned int sclp_get_max_cpu(void)
+{
+ return sclp_max_cpu;
+}
+
+int sclp_has_siif(void)
+{
+ return sclp_siif;
+}
+EXPORT_SYMBOL(sclp_has_siif);
+
+int sclp_has_sigpif(void)
+{
+ return sclp_sigpif;
+}
+EXPORT_SYMBOL(sclp_has_sigpif);
+
+unsigned int sclp_get_ibc(void)
+{
+ return sclp_ibc;
+}
+EXPORT_SYMBOL(sclp_get_ibc);
+
+unsigned int sclp_get_mtid(u8 cpu_type)
+{
+ return cpu_type ? sclp_mtid : sclp_mtid_cp;
+}
+
+unsigned int sclp_get_mtid_max(void)
+{
+ return sclp_mtid_max;
+}
+
+unsigned int sclp_get_mtid_prev(void)
+{
+ return sclp_mtid_prev;
+}
+
+/*
+ * This function will be called after sclp_facilities_detect(), which gets
+ * called from early.c code. The sclp_facilities_detect() function retrieves
+ * and saves the IPL information.
+ */
+void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
+{
+ *info = sclp_ipl_info;
+}
+
+static int __init sclp_cmd_early(sclp_cmdw_t cmd, void *sccb)
+{
+ int rc;
+
+ do {
+ rc = sclp_cmd_sync_early(cmd, sccb);
+ } while (rc == -EBUSY);
+
+ if (rc)
+ return -EIO;
+ if (((struct sccb_header *) sccb)->response_code != 0x0020)
+ return -EIO;
+ return 0;
+}
+
+static void __init sccb_init_eq_size(struct sdias_sccb *sccb)
+{
+ memset(sccb, 0, sizeof(*sccb));
+
+ sccb->hdr.length = sizeof(*sccb);
+ sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf);
+ sccb->evbuf.hdr.type = EVTYP_SDIAS;
+ sccb->evbuf.event_qual = SDIAS_EQ_SIZE;
+ sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP;
+ sccb->evbuf.event_id = 4712;
+ sccb->evbuf.dbs = 1;
+}
+
+static int __init sclp_set_event_mask(struct init_sccb *sccb,
+ unsigned long receive_mask,
+ unsigned long send_mask)
+{
+ memset(sccb, 0, sizeof(*sccb));
+ sccb->header.length = sizeof(*sccb);
+ sccb->mask_length = sizeof(sccb_mask_t);
+ sccb->receive_mask = receive_mask;
+ sccb->send_mask = send_mask;
+ return sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb);
+}
+
+static long __init sclp_hsa_size_init(struct sdias_sccb *sccb)
+{
+ sccb_init_eq_size(sccb);
+ if (sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_DATA, sccb))
+ return -EIO;
+ if (sccb->evbuf.blk_cnt == 0)
+ return 0;
+ return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE;
+}
+
+static long __init sclp_hsa_copy_wait(struct sccb_header *sccb)
+{
+ memset(sccb, 0, PAGE_SIZE);
+ sccb->length = PAGE_SIZE;
+ if (sclp_cmd_early(SCLP_CMDW_READ_EVENT_DATA, sccb))
+ return -EIO;
+ if (((struct sdias_sccb *) sccb)->evbuf.blk_cnt == 0)
+ return 0;
+ return (((struct sdias_sccb *) sccb)->evbuf.blk_cnt - 1) * PAGE_SIZE;
+}
+
+unsigned long sclp_get_hsa_size(void)
+{
+ return sclp_hsa_size;
+}
+
+static void __init sclp_hsa_size_detect(void *sccb)
+{
+ long size;
+
+ /* First try synchronous interface (LPAR) */
+ if (sclp_set_event_mask(sccb, 0, 0x40000010))
+ return;
+ size = sclp_hsa_size_init(sccb);
+ if (size < 0)
+ return;
+ if (size != 0)
+ goto out;
+ /* Then try asynchronous interface (z/VM) */
+ if (sclp_set_event_mask(sccb, 0x00000010, 0x40000010))
+ return;
+ size = sclp_hsa_size_init(sccb);
+ if (size < 0)
+ return;
+ size = sclp_hsa_copy_wait(sccb);
+ if (size < 0)
+ return;
+out:
+ sclp_hsa_size = size;
+}
+
+static unsigned int __init sclp_con_check_linemode(struct init_sccb *sccb)
+{
+ if (!(sccb->sclp_send_mask & EVTYP_OPCMD_MASK))
+ return 0;
+ if (!(sccb->sclp_receive_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK)))
+ return 0;
+ return 1;
+}
+
+static void __init sclp_console_detect(struct init_sccb *sccb)
+{
+ if (sccb->header.response_code != 0x20)
+ return;
+
+ if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK)
+ sclp_con_has_vt220 = 1;
+
+ if (sclp_con_check_linemode(sccb))
+ sclp_con_has_linemode = 1;
+}
+
+void __init sclp_early_detect(void)
+{
+ void *sccb = &sccb_early;
+
+ sclp_facilities_detect(sccb);
+ sclp_hsa_size_detect(sccb);
+
+ /* Turn off SCLP event notifications. Also save remote masks in the
+ * sccb. These are sufficient to detect sclp console capabilities.
+ */
+ sclp_set_event_mask(sccb, 0, 0);
+ sclp_console_detect(sccb);
+}
Code Review / kvmfornfv.git / blobdiff