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2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d 
 kernel/arch/x86/platform/uv/bios_uv.c
....@@ -1,22 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * BIOS run time interface routines.
34  *
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- *  This program is free software; you can redistribute it and/or modify
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- *  it under the terms of the GNU General Public License as published by
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- *  the Free Software Foundation; either version 2 of the License, or
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- *  (at your option) any later version.
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- *
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- *  This program is distributed in the hope that it will be useful,
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- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- *  GNU General Public License for more details.
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- *
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- *  You should have received a copy of the GNU General Public License
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- *  along with this program; if not, write to the Free Software
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- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
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- *
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- *  Copyright (c) 2008-2009 Silicon Graphics, Inc.  All Rights Reserved.
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- *  Copyright (c) Russ Anderson <rja@sgi.com>
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+ * (C) Copyright 2020 Hewlett Packard Enterprise Development LP
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+ * Copyright (C) 2007-2017 Silicon Graphics, Inc. All rights reserved.
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+ * Copyright (c) Russ Anderson <rja@sgi.com>
208  */
219 
2210 #include <linux/efi.h>
....@@ -24,8 +12,11 @@
2412 #include <linux/slab.h>
2513 #include <asm/efi.h>
2614 #include <linux/io.h>
15
+#include <asm/pgalloc.h>
2716 #include <asm/uv/bios.h>
2817 #include <asm/uv/uv_hub.h>
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+
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+unsigned long uv_systab_phys __ro_after_init = EFI_INVALID_TABLE_ADDR;
2920 
3021 struct uv_systab *uv_systab;
3122 
....@@ -41,19 +32,13 @@
4132 		 */
4233 		return BIOS_STATUS_UNIMPLEMENTED;
4334 
44
-	/*
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-	 * If EFI_OLD_MEMMAP is set, we need to fall back to using our old EFI
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-	 * callback method, which uses efi_call() directly, with the kernel page tables:
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-	 */
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-	if (unlikely(test_bit(EFI_OLD_MEMMAP, &efi.flags)))
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-		ret = efi_call((void *)__va(tab->function), (u64)which, a1, a2, a3, a4, a5);
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-	else
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-		ret = efi_call_virt_pointer(tab, function, (u64)which, a1, a2, a3, a4, a5);
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+	ret = efi_call_virt_pointer(tab, function, (u64)which, a1, a2, a3, a4, a5);
5236 
5337 	return ret;
5438 }
5539 
56
-s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
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+static s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4,
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+		u64 a5)
5742 {
5843 	s64 ret;
5944 
....@@ -65,10 +50,9 @@
6550 
6651 	return ret;
6752 }
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-EXPORT_SYMBOL_GPL(uv_bios_call);
6953 
70
-s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
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-					u64 a4, u64 a5)
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+static s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
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+		u64 a4, u64 a5)
7256 {
7357 	unsigned long bios_flags;
7458 	s64 ret;
....@@ -85,30 +69,13 @@
8569 	return ret;
8670 }
8771 
88
-s64 uv_bios_call_reentrant(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
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-					u64 a4, u64 a5)
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-{
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-	s64 ret;
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-
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-	preempt_disable();
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-	ret = uv_bios_call(which, a1, a2, a3, a4, a5);
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-	preempt_enable();
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-
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-	return ret;
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-}
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-
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-
10172 long sn_partition_id;
10273 EXPORT_SYMBOL_GPL(sn_partition_id);
10374 long sn_coherency_id;
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-EXPORT_SYMBOL_GPL(sn_coherency_id);
10575 long sn_region_size;
10676 EXPORT_SYMBOL_GPL(sn_region_size);
10777 long system_serial_number;
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-EXPORT_SYMBOL_GPL(system_serial_number);
10978 int uv_type;
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-EXPORT_SYMBOL_GPL(uv_type);
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-
11279 
11380 s64 uv_bios_get_sn_info(int fc, int *uvtype, long *partid, long *coher,
11481 		long *region, long *ssn)
....@@ -135,7 +102,6 @@
135102 		*ssn = v1;
136103 	return ret;
137104 }
138
-EXPORT_SYMBOL_GPL(uv_bios_get_sn_info);
139105 
140106 int
141107 uv_bios_mq_watchlist_alloc(unsigned long addr, unsigned int mq_size,
....@@ -186,7 +152,6 @@
186152 	return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,
187153 			   (u64)ticks_per_second, 0, 0, 0);
188154 }
189
-EXPORT_SYMBOL_GPL(uv_bios_freq_base);
190155 
191156 /*
192157  * uv_bios_set_legacy_vga_target - Set Legacy VGA I/O Target
....@@ -205,23 +170,32 @@
205170 	return uv_bios_call(UV_BIOS_SET_LEGACY_VGA_TARGET,
206171 				(u64)decode, (u64)domain, (u64)bus, 0, 0);
207172 }
208
-EXPORT_SYMBOL_GPL(uv_bios_set_legacy_vga_target);
209173 
210
-#ifdef CONFIG_EFI
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-void uv_bios_init(void)
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+unsigned long get_uv_systab_phys(bool msg)
212175 {
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-	uv_systab = NULL;
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-	if ((efi.uv_systab == EFI_INVALID_TABLE_ADDR) ||
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-	    !efi.uv_systab || efi_runtime_disabled()) {
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-		pr_crit("UV: UVsystab: missing\n");
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-		return;
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+	if ((uv_systab_phys == EFI_INVALID_TABLE_ADDR) ||
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+	    !uv_systab_phys || efi_runtime_disabled()) {
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+		if (msg)
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+			pr_crit("UV: UVsystab: missing\n");
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+		return 0;
218181 	}
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+	return uv_systab_phys;
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+}
219184 
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-	uv_systab = ioremap(efi.uv_systab, sizeof(struct uv_systab));
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+int uv_bios_init(void)
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+{
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+	unsigned long uv_systab_phys_addr;
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+
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+	uv_systab = NULL;
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+	uv_systab_phys_addr = get_uv_systab_phys(1);
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+	if (!uv_systab_phys_addr)
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+		return -EEXIST;
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+
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+	uv_systab = ioremap(uv_systab_phys_addr, sizeof(struct uv_systab));
221195 	if (!uv_systab || strncmp(uv_systab->signature, UV_SYSTAB_SIG, 4)) {
222196 		pr_err("UV: UVsystab: bad signature!\n");
223197 		iounmap(uv_systab);
224
-		return;
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+		return -EINVAL;
225199 	}
226200 
227201 	/* Starting with UV4 the UV systab size is variable */
....@@ -229,12 +203,12 @@
229203 		int size = uv_systab->size;
230204 
231205 		iounmap(uv_systab);
232
-		uv_systab = ioremap(efi.uv_systab, size);
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+		uv_systab = ioremap(uv_systab_phys_addr, size);
233207 		if (!uv_systab) {
234208 			pr_err("UV: UVsystab: ioremap(%d) failed!\n", size);
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-			return;
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+			return -EFAULT;
236210 		}
237211 	}
238212 	pr_info("UV: UVsystab: Revision:%x\n", uv_systab->revision);
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+	return 0;
239214 }
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-#endif