From 1543e317f1da31b75942316931e8f491a8920811 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Thu, 04 Jan 2024 10:08:02 +0000
Subject: [PATCH] disable FB
---
kernel/arch/arm64/include/asm/mmu_context.h | 78 ++++++++++++++++++++++++++-------------
1 files changed, 52 insertions(+), 26 deletions(-)
diff --git a/kernel/arch/arm64/include/asm/mmu_context.h b/kernel/arch/arm64/include/asm/mmu_context.h
index 95d5d75..cc58614 100644
--- a/kernel/arch/arm64/include/asm/mmu_context.h
+++ b/kernel/arch/arm64/include/asm/mmu_context.h
@@ -1,20 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Based on arch/arm/include/asm/mmu_context.h
*
* Copyright (C) 1996 Russell King.
* Copyright (C) 2012 ARM Ltd.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ASM_MMU_CONTEXT_H
#define __ASM_MMU_CONTEXT_H
@@ -25,15 +14,17 @@
#include <linux/sched.h>
#include <linux/sched/hotplug.h>
#include <linux/mm_types.h>
+#include <linux/pgtable.h>
#include <asm/cacheflush.h>
#include <asm/cpufeature.h>
#include <asm/proc-fns.h>
#include <asm-generic/mm_hooks.h>
#include <asm/cputype.h>
-#include <asm/pgtable.h>
#include <asm/sysreg.h>
#include <asm/tlbflush.h>
+
+extern bool rodata_full;
static inline void contextidr_thread_switch(struct task_struct *next)
{
@@ -45,15 +36,17 @@
}
/*
- * Set TTBR0 to empty_zero_page. No translations will be possible via TTBR0.
+ * Set TTBR0 to reserved_pg_dir. No translations will be possible via TTBR0.
*/
static inline void cpu_set_reserved_ttbr0(void)
{
- unsigned long ttbr = phys_to_ttbr(__pa_symbol(empty_zero_page));
+ unsigned long ttbr = phys_to_ttbr(__pa_symbol(reserved_pg_dir));
write_sysreg(ttbr, ttbr0_el1);
isb();
}
+
+void cpu_do_switch_mm(phys_addr_t pgd_phys, struct mm_struct *mm);
static inline void cpu_switch_mm(pgd_t *pgd, struct mm_struct *mm)
{
@@ -72,7 +65,7 @@
static inline bool __cpu_uses_extended_idmap(void)
{
- return unlikely(idmap_t0sz != TCR_T0SZ(VA_BITS));
+ return unlikely(idmap_t0sz != TCR_T0SZ(vabits_actual));
}
/*
@@ -101,7 +94,7 @@
isb();
}
-#define cpu_set_default_tcr_t0sz() __cpu_set_tcr_t0sz(TCR_T0SZ(VA_BITS))
+#define cpu_set_default_tcr_t0sz() __cpu_set_tcr_t0sz(TCR_T0SZ(vabits_actual))
#define cpu_set_idmap_tcr_t0sz() __cpu_set_tcr_t0sz(idmap_t0sz)
/*
@@ -147,12 +140,25 @@
extern ttbr_replace_func idmap_cpu_replace_ttbr1;
ttbr_replace_func *replace_phys;
- phys_addr_t pgd_phys = virt_to_phys(pgdp);
+ /* phys_to_ttbr() zeros lower 2 bits of ttbr with 52-bit PA */
+ phys_addr_t ttbr1 = phys_to_ttbr(virt_to_phys(pgdp));
+
+ if (system_supports_cnp() && !WARN_ON(pgdp != lm_alias(swapper_pg_dir))) {
+ /*
+ * cpu_replace_ttbr1() is used when there's a boot CPU
+ * up (i.e. cpufeature framework is not up yet) and
+ * latter only when we enable CNP via cpufeature's
+ * enable() callback.
+ * Also we rely on the cpu_hwcap bit being set before
+ * calling the enable() function.
+ */
+ ttbr1 |= TTBR_CNP_BIT;
+ }
replace_phys = (void *)__pa_function(idmap_cpu_replace_ttbr1);
cpu_install_idmap();
- replace_phys(pgd_phys);
+ replace_phys(ttbr1);
cpu_uninstall_idmap();
}
@@ -166,9 +172,15 @@
* take CPU migration into account.
*/
#define destroy_context(mm) do { } while(0)
-void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);
+void check_and_switch_context(struct mm_struct *mm);
-#define init_new_context(tsk,mm) ({ atomic64_set(&(mm)->context.id, 0); 0; })
+static inline int
+init_new_context(struct task_struct *tsk, struct mm_struct *mm)
+{
+ atomic64_set(&mm->context.id, 0);
+ refcount_set(&mm->context.pinned, 0);
+ return 0;
+}
#ifdef CONFIG_ARM64_SW_TTBR0_PAN
static inline void update_saved_ttbr0(struct task_struct *tsk,
@@ -180,9 +192,9 @@
return;
if (mm == &init_mm)
- ttbr = __pa_symbol(empty_zero_page);
+ ttbr = phys_to_ttbr(__pa_symbol(reserved_pg_dir));
else
- ttbr = virt_to_phys(mm->pgd) | ASID(mm) << 48;
+ ttbr = phys_to_ttbr(virt_to_phys(mm->pgd)) | ASID(mm) << 48;
WRITE_ONCE(task_thread_info(tsk)->ttbr0, ttbr);
}
@@ -205,8 +217,6 @@
static inline void __switch_mm(struct mm_struct *next)
{
- unsigned int cpu = smp_processor_id();
-
/*
* init_mm.pgd does not contain any user mappings and it is always
* active for kernel addresses in TTBR1. Just set the reserved TTBR0.
@@ -216,7 +226,7 @@
return;
}
- check_and_switch_context(next, cpu);
+ check_and_switch_context(next);
}
static inline void
@@ -238,9 +248,25 @@
#define deactivate_mm(tsk,mm) do { } while (0)
#define activate_mm(prev,next) switch_mm(prev, next, current)
+static inline const struct cpumask *
+task_cpu_possible_mask(struct task_struct *p)
+{
+ if (!static_branch_unlikely(&arm64_mismatched_32bit_el0))
+ return cpu_possible_mask;
+
+ if (!is_compat_thread(task_thread_info(p)))
+ return cpu_possible_mask;
+
+ return system_32bit_el0_cpumask();
+}
+#define task_cpu_possible_mask task_cpu_possible_mask
+
void verify_cpu_asid_bits(void);
void post_ttbr_update_workaround(void);
+unsigned long arm64_mm_context_get(struct mm_struct *mm);
+void arm64_mm_context_put(struct mm_struct *mm);
+
#endif /* !__ASSEMBLY__ */
#endif /* !__ASM_MMU_CONTEXT_H */
--
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