v4.19.13 snapshot.
diff --git a/arch/ia64/sn/kernel/mca.c b/arch/ia64/sn/kernel/mca.c
new file mode 100644
index 0000000..bc3bd93
--- /dev/null
+++ b/arch/ia64/sn/kernel/mca.c
@@ -0,0 +1,144 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc. All Rights Reserved.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/vmalloc.h>
+#include <linux/mutex.h>
+#include <asm/mca.h>
+#include <asm/sal.h>
+#include <asm/sn/sn_sal.h>
+
+/*
+ * Interval for calling SAL to poll for errors that do NOT cause error
+ * interrupts. SAL will raise a CPEI if any errors are present that
+ * need to be logged.
+ */
+#define CPEI_INTERVAL (5*HZ)
+
+struct timer_list sn_cpei_timer;
+void sn_init_cpei_timer(void);
+
+/* Printing oemdata from mca uses data that is not passed through SAL, it is
+ * global. Only one user at a time.
+ */
+static DEFINE_MUTEX(sn_oemdata_mutex);
+static u8 **sn_oemdata;
+static u64 *sn_oemdata_size, sn_oemdata_bufsize;
+
+/*
+ * print_hook
+ *
+ * This function is the callback routine that SAL calls to log error
+ * info for platform errors. buf is appended to sn_oemdata, resizing as
+ * required.
+ * Note: this is a SAL to OS callback, running under the same rules as the SAL
+ * code. SAL calls are run with preempt disabled so this routine must not
+ * sleep. vmalloc can sleep so print_hook cannot resize the output buffer
+ * itself, instead it must set the required size and return to let the caller
+ * resize the buffer then redrive the SAL call.
+ */
+static int print_hook(const char *fmt, ...)
+{
+ char buf[400];
+ int len;
+ va_list args;
+ va_start(args, fmt);
+ vsnprintf(buf, sizeof(buf), fmt, args);
+ va_end(args);
+ len = strlen(buf);
+ if (*sn_oemdata_size + len <= sn_oemdata_bufsize)
+ memcpy(*sn_oemdata + *sn_oemdata_size, buf, len);
+ *sn_oemdata_size += len;
+ return 0;
+}
+
+static void sn_cpei_handler(int irq, void *devid, struct pt_regs *regs)
+{
+ /*
+ * this function's sole purpose is to call SAL when we receive
+ * a CE interrupt from SHUB or when the timer routine decides
+ * we need to call SAL to check for CEs.
+ */
+
+ /* CALL SAL_LOG_CE */
+
+ ia64_sn_plat_cpei_handler();
+}
+
+static void sn_cpei_timer_handler(struct timer_list *unused)
+{
+ sn_cpei_handler(-1, NULL, NULL);
+ mod_timer(&sn_cpei_timer, jiffies + CPEI_INTERVAL);
+}
+
+void sn_init_cpei_timer(void)
+{
+ timer_setup(&sn_cpei_timer, sn_cpei_timer_handler, 0);
+ sn_cpei_timer.expires = jiffies + CPEI_INTERVAL;
+ add_timer(&sn_cpei_timer);
+}
+
+static int
+sn_platform_plat_specific_err_print(const u8 * sect_header, u8 ** oemdata,
+ u64 * oemdata_size)
+{
+ mutex_lock(&sn_oemdata_mutex);
+ sn_oemdata = oemdata;
+ sn_oemdata_size = oemdata_size;
+ sn_oemdata_bufsize = 0;
+ *sn_oemdata_size = PAGE_SIZE; /* first guess at how much data will be generated */
+ while (*sn_oemdata_size > sn_oemdata_bufsize) {
+ u8 *newbuf = vmalloc(*sn_oemdata_size);
+ if (!newbuf) {
+ mutex_unlock(&sn_oemdata_mutex);
+ printk(KERN_ERR "%s: unable to extend sn_oemdata\n",
+ __func__);
+ return 1;
+ }
+ vfree(*sn_oemdata);
+ *sn_oemdata = newbuf;
+ sn_oemdata_bufsize = *sn_oemdata_size;
+ *sn_oemdata_size = 0;
+ ia64_sn_plat_specific_err_print(print_hook, (char *)sect_header);
+ }
+ mutex_unlock(&sn_oemdata_mutex);
+ return 0;
+}
+
+/* Callback when userspace salinfo wants to decode oem data via the platform
+ * kernel and/or prom.
+ */
+int sn_salinfo_platform_oemdata(const u8 *sect_header, u8 **oemdata, u64 *oemdata_size)
+{
+ efi_guid_t guid = *(efi_guid_t *)sect_header;
+ int valid = 0;
+ *oemdata_size = 0;
+ vfree(*oemdata);
+ *oemdata = NULL;
+ if (efi_guidcmp(guid, SAL_PLAT_SPECIFIC_ERR_SECT_GUID) == 0) {
+ sal_log_plat_specific_err_info_t *psei = (sal_log_plat_specific_err_info_t *)sect_header;
+ valid = psei->valid.oem_data;
+ } else if (efi_guidcmp(guid, SAL_PLAT_MEM_DEV_ERR_SECT_GUID) == 0) {
+ sal_log_mem_dev_err_info_t *mdei = (sal_log_mem_dev_err_info_t *)sect_header;
+ valid = mdei->valid.oem_data;
+ }
+ if (valid)
+ return sn_platform_plat_specific_err_print(sect_header, oemdata, oemdata_size);
+ else
+ return 0;
+}
+
+static int __init sn_salinfo_init(void)
+{
+ if (ia64_platform_is("sn2"))
+ salinfo_platform_oemdata = &sn_salinfo_platform_oemdata;
+ return 0;
+}
+device_initcall(sn_salinfo_init);