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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/s390/char/sclp_early.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/s390/char/sclp_early.c')
-rw-r--r--drivers/s390/char/sclp_early.c181
1 files changed, 181 insertions, 0 deletions
diff --git a/drivers/s390/char/sclp_early.c b/drivers/s390/char/sclp_early.c
new file mode 100644
index 000000000..140d4ee29
--- /dev/null
+++ b/drivers/s390/char/sclp_early.c
@@ -0,0 +1,181 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * SCLP early driver
+ *
+ * Copyright IBM Corp. 2013
+ */
+
+#define KMSG_COMPONENT "sclp_early"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/errno.h>
+#include <linux/memblock.h>
+#include <asm/ctl_reg.h>
+#include <asm/sclp.h>
+#include <asm/ipl.h>
+#include <asm/setup.h>
+#include <asm/facility.h>
+#include "sclp_sdias.h"
+#include "sclp.h"
+
+static struct sclp_ipl_info sclp_ipl_info;
+
+struct sclp_info sclp;
+EXPORT_SYMBOL(sclp);
+
+static void __init sclp_early_facilities_detect(void)
+{
+ struct sclp_core_entry *cpue;
+ struct read_info_sccb *sccb;
+ u16 boot_cpu_address, cpu;
+
+ sccb = sclp_early_get_info();
+ if (!sccb)
+ return;
+
+ sclp.facilities = sccb->facilities;
+ sclp.has_sprp = !!(sccb->fac84 & 0x02);
+ sclp.has_core_type = !!(sccb->fac84 & 0x01);
+ sclp.has_gsls = !!(sccb->fac85 & 0x80);
+ sclp.has_64bscao = !!(sccb->fac116 & 0x80);
+ sclp.has_cmma = !!(sccb->fac116 & 0x40);
+ sclp.has_esca = !!(sccb->fac116 & 0x08);
+ sclp.has_pfmfi = !!(sccb->fac117 & 0x40);
+ sclp.has_ibs = !!(sccb->fac117 & 0x20);
+ sclp.has_gisaf = !!(sccb->fac118 & 0x08);
+ sclp.has_hvs = !!(sccb->fac119 & 0x80);
+ sclp.has_kss = !!(sccb->fac98 & 0x01);
+ sclp.has_aisii = !!(sccb->fac118 & 0x40);
+ sclp.has_aeni = !!(sccb->fac118 & 0x20);
+ sclp.has_aisi = !!(sccb->fac118 & 0x10);
+ sclp.has_zpci_lsi = !!(sccb->fac118 & 0x01);
+ if (sccb->fac85 & 0x02)
+ S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
+ if (sccb->fac91 & 0x40)
+ S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST;
+ if (sccb->cpuoff > 134) {
+ sclp.has_diag318 = !!(sccb->byte_134 & 0x80);
+ sclp.has_iplcc = !!(sccb->byte_134 & 0x02);
+ }
+ if (sccb->cpuoff > 137)
+ sclp.has_sipl = !!(sccb->cbl & 0x4000);
+ 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->hamaxpow && sccb->hamaxpow < 64)
+ sclp.hamax = (1UL << sccb->hamaxpow) - 1;
+ else
+ sclp.hamax = U64_MAX;
+
+ if (!sccb->hcpua) {
+ if (MACHINE_IS_VM)
+ sclp.max_cores = 64;
+ else
+ sclp.max_cores = sccb->ncpurl;
+ } else {
+ sclp.max_cores = 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.has_siif = cpue->siif;
+ sclp.has_sigpif = cpue->sigpif;
+ sclp.has_sief2 = cpue->sief2;
+ sclp.has_gpere = cpue->gpere;
+ sclp.has_ib = cpue->ib;
+ sclp.has_cei = cpue->cei;
+ sclp.has_skey = cpue->skey;
+ break;
+ }
+
+ /* Save IPL information */
+ sclp_ipl_info.is_valid = 1;
+ if (sccb->fac91 & 0x2)
+ sclp_ipl_info.has_dump = 1;
+ memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);
+
+ if (sccb->hsa_size)
+ sclp.hsa_size = (sccb->hsa_size - 1) * PAGE_SIZE;
+ sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0;
+ sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0;
+ sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
+
+ sclp.hmfai = sccb->hmfai;
+ sclp.has_dirq = !!(sccb->cpudirq & 0x80);
+}
+
+/*
+ * This function will be called after sclp_early_facilities_detect(), which gets
+ * called from early.c code. The sclp_early_facilities_detect() function retrieves
+ * and saves the IPL information.
+ */
+void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info)
+{
+ *info = sclp_ipl_info;
+}
+
+int __init sclp_early_get_core_info(struct sclp_core_info *info)
+{
+ struct read_cpu_info_sccb *sccb;
+ int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE;
+ int rc = 0;
+
+ if (!SCLP_HAS_CPU_INFO)
+ return -EOPNOTSUPP;
+
+ sccb = memblock_alloc_low(length, PAGE_SIZE);
+ if (!sccb)
+ return -ENOMEM;
+
+ memset(sccb, 0, length);
+ sccb->header.length = length;
+ sccb->header.control_mask[2] = 0x80;
+ if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) {
+ rc = -EIO;
+ goto out;
+ }
+ if (sccb->header.response_code != 0x0010) {
+ rc = -EIO;
+ goto out;
+ }
+ sclp_fill_core_info(info, sccb);
+out:
+ memblock_free(sccb, length);
+ return rc;
+}
+
+static void __init sclp_early_console_detect(struct init_sccb *sccb)
+{
+ if (sccb->header.response_code != 0x20)
+ return;
+
+ if (sclp_early_con_check_vt220(sccb))
+ sclp.has_vt220 = 1;
+
+ if (sclp_early_con_check_linemode(sccb))
+ sclp.has_linemode = 1;
+}
+
+void __init __no_sanitize_address sclp_early_adjust_va(void)
+{
+ sclp_early_sccb = __va((unsigned long)sclp_early_sccb);
+}
+
+void __init sclp_early_detect(void)
+{
+ void *sccb = sclp_early_sccb;
+
+ sclp_early_facilities_detect();
+
+ /*
+ * Turn off SCLP event notifications. Also save remote masks in the
+ * sccb. These are sufficient to detect sclp console capabilities.
+ */
+ sclp_early_set_event_mask(sccb, 0, 0);
+ sclp_early_console_detect(sccb);
+}