1 files changed, 126 insertions, 0 deletions
diff --git a/arch/x86/kernel/apic/bigsmp_32.c b/arch/x86/kernel/apic/bigsmp_32.c
new file mode 100644
index 000000000..0e5535add
--- /dev/null
+++ b/arch/x86/kernel/apic/bigsmp_32.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * APIC driver for "bigsmp" xAPIC machines with more than 8 virtual CPUs.
+ *
+ * Drives the local APIC in "clustered mode".
+ */
+#include <linux/cpumask.h>
+#include <linux/dmi.h>
+#include <linux/smp.h>
+
+#include <asm/apic.h>
+#include <asm/io_apic.h>
+
+#include "local.h"
+
+static unsigned bigsmp_get_apic_id(unsigned long x)
+{
+	return (x >> 24) & 0xFF;
+}
+
+static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
+{
+	return false;
+}
+
+static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
+{
+	/* For clustered we don't have a good way to do this yet - hack */
+	physids_promote(0xFFL, retmap);
+}
+
+static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
+{
+	return cpuid_apic >> index_msb;
+}
+
+static void bigsmp_send_IPI_allbutself(int vector)
+{
+	default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
+}
+
+static void bigsmp_send_IPI_all(int vector)
+{
+	default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
+}
+
+static int dmi_bigsmp; /* can be set by dmi scanners */
+
+static int hp_ht_bigsmp(const struct dmi_system_id *d)
+{
+	printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
+	dmi_bigsmp = 1;
+
+	return 0;
+}
+
+
+static const struct dmi_system_id bigsmp_dmi_table[] = {
+	{ hp_ht_bigsmp, "HP ProLiant DL760 G2",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
+			DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
+		}
+	},
+
+	{ hp_ht_bigsmp, "HP ProLiant DL740",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
+			DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
+		}
+	},
+	{ } /* NULL entry stops DMI scanning */
+};
+
+static int probe_bigsmp(void)
+{
+	return dmi_check_system(bigsmp_dmi_table);
+}
+
+static struct apic apic_bigsmp __ro_after_init = {
+
+	.name				= "bigsmp",
+	.probe				= probe_bigsmp,
+
+	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
+	.dest_mode_logical		= false,
+
+	.disable_esr			= 1,
+
+	.check_apicid_used		= bigsmp_check_apicid_used,
+	.ioapic_phys_id_map		= bigsmp_ioapic_phys_id_map,
+	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
+	.phys_pkg_id			= bigsmp_phys_pkg_id,
+
+	.max_apic_id			= 0xFE,
+	.get_apic_id			= bigsmp_get_apic_id,
+	.set_apic_id			= NULL,
+
+	.calc_dest_apicid		= apic_default_calc_apicid,
+
+	.send_IPI			= default_send_IPI_single_phys,
+	.send_IPI_mask			= default_send_IPI_mask_sequence_phys,
+	.send_IPI_mask_allbutself	= NULL,
+	.send_IPI_allbutself		= bigsmp_send_IPI_allbutself,
+	.send_IPI_all			= bigsmp_send_IPI_all,
+	.send_IPI_self			= default_send_IPI_self,
+
+	.read				= native_apic_mem_read,
+	.write				= native_apic_mem_write,
+	.eoi				= native_apic_mem_eoi,
+	.icr_read			= native_apic_icr_read,
+	.icr_write			= native_apic_icr_write,
+	.wait_icr_idle			= apic_mem_wait_icr_idle,
+	.safe_wait_icr_idle		= apic_mem_wait_icr_idle_timeout,
+};
+
+bool __init apic_bigsmp_possible(bool cmdline_override)
+{
+	return apic == &apic_bigsmp || !cmdline_override;
+}
+
+void __init apic_bigsmp_force(void)
+{
+	if (apic != &apic_bigsmp)
+		apic_install_driver(&apic_bigsmp);
+}
+
+apic_driver(apic_bigsmp);