add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/x86/kernel/tboot.c
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@@ -1,25 +1,12 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * tboot.c: main implementation of helper functions used by kernel for
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  *          runtime support of Intel(R) Trusted Execution Technology
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  *
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  * Copyright (c) 2006-2009, Intel Corporation
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms and conditions of the GNU General Public License,
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- * version 2, as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope it will be useful, but WITHOUT
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- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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- * more details.
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- *
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- * You should have received a copy of the GNU General Public License along with
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- * this program; if not, write to the Free Software Foundation, Inc.,
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- * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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- *
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  */
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8
 
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-#include <linux/dma_remapping.h>
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+#include <linux/intel-iommu.h>
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 #include <linux/init_task.h>
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 #include <linux/spinlock.h>
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 #include <linux/export.h>
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@@ -36,7 +23,6 @@
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 #include <asm/realmode.h>
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 #include <asm/processor.h>
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 #include <asm/bootparam.h>
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-#include <asm/pgtable.h>
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 #include <asm/pgalloc.h>
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 #include <asm/swiotlb.h>
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 #include <asm/fixmap.h>
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@@ -48,8 +34,7 @@
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 #include "../realmode/rm/wakeup.h"
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 /* Global pointer to shared data; NULL means no measured launch. */
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-struct tboot *tboot __read_mostly;
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-EXPORT_SYMBOL(tboot);
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+static struct tboot *tboot __read_mostly;
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38
 
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 /* timeout for APs (in secs) to enter wait-for-SIPI state during shutdown */
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 #define AP_WAIT_TIMEOUT		1
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@@ -58,6 +43,11 @@
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 #define pr_fmt(fmt)	"tboot: " fmt
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 static u8 tboot_uuid[16] __initdata = TBOOT_UUID;
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+
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+bool tboot_enabled(void)
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+{
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+	return tboot != NULL;
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+}
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 void __init tboot_probe(void)
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 {
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@@ -70,7 +60,7 @@
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 	 */
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 	if (!e820__mapped_any(boot_params.tboot_addr,
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 			     boot_params.tboot_addr, E820_TYPE_RESERVED)) {
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-		pr_warning("non-0 tboot_addr but it is not of type E820_TYPE_RESERVED\n");
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+		pr_warn("non-0 tboot_addr but it is not of type E820_TYPE_RESERVED\n");
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 		return;
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 	}
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@@ -78,13 +68,12 @@
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 	set_fixmap(FIX_TBOOT_BASE, boot_params.tboot_addr);
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 	tboot = (struct tboot *)fix_to_virt(FIX_TBOOT_BASE);
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 	if (memcmp(&tboot_uuid, &tboot->uuid, sizeof(tboot->uuid))) {
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-		pr_warning("tboot at 0x%llx is invalid\n",
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-			   boot_params.tboot_addr);
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+		pr_warn("tboot at 0x%llx is invalid\n", boot_params.tboot_addr);
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 		tboot = NULL;
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 		return;
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 	}
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 	if (tboot->version < 5) {
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-		pr_warning("tboot version is invalid: %u\n", tboot->version);
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+		pr_warn("tboot version is invalid: %u\n", tboot->version);
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 		tboot = NULL;
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 		return;
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 	}
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@@ -104,7 +93,8 @@
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 	.pgd            = swapper_pg_dir,
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 	.mm_users       = ATOMIC_INIT(2),
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 	.mm_count       = ATOMIC_INIT(1),
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-	.mmap_sem       = __RWSEM_INITIALIZER(init_mm.mmap_sem),
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+	.write_protect_seq = SEQCNT_ZERO(tboot_mm.write_protect_seq),
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+	MMAP_LOCK_INITIALIZER(init_mm)
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 	.page_table_lock =  __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
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 	.mmlist         = LIST_HEAD_INIT(init_mm.mmlist),
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 };
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@@ -302,7 +292,7 @@
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 	if (sleep_state >= ACPI_S_STATE_COUNT ||
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 	    acpi_shutdown_map[sleep_state] == -1) {
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-		pr_warning("unsupported sleep state 0x%x\n", sleep_state);
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+		pr_warn("unsupported sleep state 0x%x\n", sleep_state);
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 		return -1;
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 	}
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@@ -315,7 +305,7 @@
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 	if (!tboot_enabled())
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 		return 0;
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-	pr_warning("tboot is not able to suspend on platforms with reduced hardware sleep (ACPIv5)");
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+	pr_warn("tboot is not able to suspend on platforms with reduced hardware sleep (ACPIv5)");
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 	return -ENODEV;
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 }
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@@ -333,7 +323,7 @@
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 	}
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 	if (timeout)
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-		pr_warning("tboot wait for APs timeout\n");
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+		pr_warn("tboot wait for APs timeout\n");
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 	return !(atomic_read((atomic_t *)&tboot->num_in_wfs) == num_aps);
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 }
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@@ -368,7 +358,7 @@
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 	void *kbuf;
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 	int ret = -EFAULT;
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-	log_base = ioremap_nocache(TBOOT_SERIAL_LOG_ADDR, TBOOT_SERIAL_LOG_SIZE);
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+	log_base = ioremap(TBOOT_SERIAL_LOG_ADDR, TBOOT_SERIAL_LOG_SIZE);
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 	if (!log_base)
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 		return ret;
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@@ -525,16 +515,10 @@
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 	if (!tboot_enabled())
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 		return 0;
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-	if (intel_iommu_tboot_noforce)
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-		return 1;
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-
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-	if (no_iommu || swiotlb || dmar_disabled)
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-		pr_warning("Forcing Intel-IOMMU to enabled\n");
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+	if (no_iommu || dmar_disabled)
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+		pr_warn("Forcing Intel-IOMMU to enabled\n");
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 	dmar_disabled = 0;
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-#ifdef CONFIG_SWIOTLB
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-	swiotlb = 0;
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-#endif
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 	no_iommu = 0;
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 	return 1;