From a5969cabbb4660eab42b6ef0412cbbd1200cf14d Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Sat, 12 Oct 2024 07:10:09 +0000
Subject: [PATCH] 修改led为gpio
---
kernel/arch/x86/include/asm/tlbflush.h | 470 +++++++---------------------------------------------------
1 files changed, 60 insertions(+), 410 deletions(-)
diff --git a/kernel/arch/x86/include/asm/tlbflush.h b/kernel/arch/x86/include/asm/tlbflush.h
index 79ec7ad..8c87a2e 100644
--- a/kernel/arch/x86/include/asm/tlbflush.h
+++ b/kernel/arch/x86/include/asm/tlbflush.h
@@ -13,156 +13,51 @@
#include <asm/pti.h>
#include <asm/processor-flags.h>
-/*
- * The x86 feature is called PCID (Process Context IDentifier). It is similar
- * to what is traditionally called ASID on the RISC processors.
- *
- * We don't use the traditional ASID implementation, where each process/mm gets
- * its own ASID and flush/restart when we run out of ASID space.
- *
- * Instead we have a small per-cpu array of ASIDs and cache the last few mm's
- * that came by on this CPU, allowing cheaper switch_mm between processes on
- * this CPU.
- *
- * We end up with different spaces for different things. To avoid confusion we
- * use different names for each of them:
- *
- * ASID - [0, TLB_NR_DYN_ASIDS-1]
- * the canonical identifier for an mm
- *
- * kPCID - [1, TLB_NR_DYN_ASIDS]
- * the value we write into the PCID part of CR3; corresponds to the
- * ASID+1, because PCID 0 is special.
- *
- * uPCID - [2048 + 1, 2048 + TLB_NR_DYN_ASIDS]
- * for KPTI each mm has two address spaces and thus needs two
- * PCID values, but we can still do with a single ASID denomination
- * for each mm. Corresponds to kPCID + 2048.
- *
- */
+void __flush_tlb_all(void);
-/* There are 12 bits of space for ASIDS in CR3 */
-#define CR3_HW_ASID_BITS 12
+#define TLB_FLUSH_ALL -1UL
-/*
- * When enabled, PAGE_TABLE_ISOLATION consumes a single bit for
- * user/kernel switches
- */
-#ifdef CONFIG_PAGE_TABLE_ISOLATION
-# define PTI_CONSUMED_PCID_BITS 1
-#else
-# define PTI_CONSUMED_PCID_BITS 0
-#endif
+void cr4_update_irqsoff(unsigned long set, unsigned long clear);
+unsigned long cr4_read_shadow(void);
-#define CR3_AVAIL_PCID_BITS (X86_CR3_PCID_BITS - PTI_CONSUMED_PCID_BITS)
+/* Set in this cpu's CR4. */
+static inline void cr4_set_bits_irqsoff(unsigned long mask)
+{
+ cr4_update_irqsoff(mask, 0);
+}
-/*
- * ASIDs are zero-based: 0->MAX_AVAIL_ASID are valid. -1 below to account
- * for them being zero-based. Another -1 is because PCID 0 is reserved for
- * use by non-PCID-aware users.
- */
-#define MAX_ASID_AVAILABLE ((1 << CR3_AVAIL_PCID_BITS) - 2)
+/* Clear in this cpu's CR4. */
+static inline void cr4_clear_bits_irqsoff(unsigned long mask)
+{
+ cr4_update_irqsoff(0, mask);
+}
+/* Set in this cpu's CR4. */
+static inline void cr4_set_bits(unsigned long mask)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ cr4_set_bits_irqsoff(mask);
+ local_irq_restore(flags);
+}
+
+/* Clear in this cpu's CR4. */
+static inline void cr4_clear_bits(unsigned long mask)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ cr4_clear_bits_irqsoff(mask);
+ local_irq_restore(flags);
+}
+
+#ifndef MODULE
/*
* 6 because 6 should be plenty and struct tlb_state will fit in two cache
* lines.
*/
#define TLB_NR_DYN_ASIDS 6
-
-/*
- * Given @asid, compute kPCID
- */
-static inline u16 kern_pcid(u16 asid)
-{
- VM_WARN_ON_ONCE(asid > MAX_ASID_AVAILABLE);
-
-#ifdef CONFIG_PAGE_TABLE_ISOLATION
- /*
- * Make sure that the dynamic ASID space does not confict with the
- * bit we are using to switch between user and kernel ASIDs.
- */
- BUILD_BUG_ON(TLB_NR_DYN_ASIDS >= (1 << X86_CR3_PTI_PCID_USER_BIT));
-
- /*
- * The ASID being passed in here should have respected the
- * MAX_ASID_AVAILABLE and thus never have the switch bit set.
- */
- VM_WARN_ON_ONCE(asid & (1 << X86_CR3_PTI_PCID_USER_BIT));
-#endif
- /*
- * The dynamically-assigned ASIDs that get passed in are small
- * (<TLB_NR_DYN_ASIDS). They never have the high switch bit set,
- * so do not bother to clear it.
- *
- * If PCID is on, ASID-aware code paths put the ASID+1 into the
- * PCID bits. This serves two purposes. It prevents a nasty
- * situation in which PCID-unaware code saves CR3, loads some other
- * value (with PCID == 0), and then restores CR3, thus corrupting
- * the TLB for ASID 0 if the saved ASID was nonzero. It also means
- * that any bugs involving loading a PCID-enabled CR3 with
- * CR4.PCIDE off will trigger deterministically.
- */
- return asid + 1;
-}
-
-/*
- * Given @asid, compute uPCID
- */
-static inline u16 user_pcid(u16 asid)
-{
- u16 ret = kern_pcid(asid);
-#ifdef CONFIG_PAGE_TABLE_ISOLATION
- ret |= 1 << X86_CR3_PTI_PCID_USER_BIT;
-#endif
- return ret;
-}
-
-struct pgd_t;
-static inline unsigned long build_cr3(pgd_t *pgd, u16 asid)
-{
- if (static_cpu_has(X86_FEATURE_PCID)) {
- return __sme_pa(pgd) | kern_pcid(asid);
- } else {
- VM_WARN_ON_ONCE(asid != 0);
- return __sme_pa(pgd);
- }
-}
-
-static inline unsigned long build_cr3_noflush(pgd_t *pgd, u16 asid)
-{
- VM_WARN_ON_ONCE(asid > MAX_ASID_AVAILABLE);
- /*
- * Use boot_cpu_has() instead of this_cpu_has() as this function
- * might be called during early boot. This should work even after
- * boot because all CPU's the have same capabilities:
- */
- VM_WARN_ON_ONCE(!boot_cpu_has(X86_FEATURE_PCID));
- return __sme_pa(pgd) | kern_pcid(asid) | CR3_NOFLUSH;
-}
-
-#ifdef CONFIG_PARAVIRT
-#include <asm/paravirt.h>
-#else
-#define __flush_tlb() __native_flush_tlb()
-#define __flush_tlb_global() __native_flush_tlb_global()
-#define __flush_tlb_one_user(addr) __native_flush_tlb_one_user(addr)
-#endif
-
-static inline bool tlb_defer_switch_to_init_mm(void)
-{
- /*
- * If we have PCID, then switching to init_mm is reasonably
- * fast. If we don't have PCID, then switching to init_mm is
- * quite slow, so we try to defer it in the hopes that we can
- * avoid it entirely. The latter approach runs the risk of
- * receiving otherwise unnecessary IPIs.
- *
- * This choice is just a heuristic. The tlb code can handle this
- * function returning true or false regardless of whether we have
- * PCID.
- */
- return !static_cpu_has(X86_FEATURE_PCID);
-}
struct tlb_context {
u64 ctx_id;
@@ -183,7 +78,7 @@
*/
struct mm_struct *loaded_mm;
-#define LOADED_MM_SWITCHING ((struct mm_struct *)1)
+#define LOADED_MM_SWITCHING ((struct mm_struct *)1UL)
/* Last user mm for optimizing IBPB */
union {
@@ -258,37 +153,8 @@
};
DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);
-/*
- * Blindly accessing user memory from NMI context can be dangerous
- * if we're in the middle of switching the current user task or
- * switching the loaded mm. It can also be dangerous if we
- * interrupted some kernel code that was temporarily using a
- * different mm.
- */
-static inline bool nmi_uaccess_okay(void)
-{
- struct mm_struct *loaded_mm = this_cpu_read(cpu_tlbstate.loaded_mm);
- struct mm_struct *current_mm = current->mm;
-
- VM_WARN_ON_ONCE(!loaded_mm);
-
- /*
- * The condition we want to check is
- * current_mm->pgd == __va(read_cr3_pa()). This may be slow, though,
- * if we're running in a VM with shadow paging, and nmi_uaccess_okay()
- * is supposed to be reasonably fast.
- *
- * Instead, we check the almost equivalent but somewhat conservative
- * condition below, and we rely on the fact that switch_mm_irqs_off()
- * sets loaded_mm to LOADED_MM_SWITCHING before writing to CR3.
- */
- if (loaded_mm != current_mm)
- return false;
-
- VM_WARN_ON_ONCE(current_mm->pgd != __va(read_cr3_pa()));
-
- return true;
-}
+bool nmi_uaccess_okay(void);
+#define nmi_uaccess_okay nmi_uaccess_okay
/* Initialize cr4 shadow for this CPU. */
static inline void cr4_init_shadow(void)
@@ -296,232 +162,10 @@
this_cpu_write(cpu_tlbstate.cr4, __read_cr4());
}
-static inline void __cr4_set(unsigned long cr4)
-{
- lockdep_assert_irqs_disabled();
- this_cpu_write(cpu_tlbstate.cr4, cr4);
- __write_cr4(cr4);
-}
-
-/* Set in this cpu's CR4. */
-static inline void cr4_set_bits(unsigned long mask)
-{
- unsigned long cr4, flags;
-
- local_irq_save(flags);
- cr4 = this_cpu_read(cpu_tlbstate.cr4);
- if ((cr4 | mask) != cr4)
- __cr4_set(cr4 | mask);
- local_irq_restore(flags);
-}
-
-/* Clear in this cpu's CR4. */
-static inline void cr4_clear_bits(unsigned long mask)
-{
- unsigned long cr4, flags;
-
- local_irq_save(flags);
- cr4 = this_cpu_read(cpu_tlbstate.cr4);
- if ((cr4 & ~mask) != cr4)
- __cr4_set(cr4 & ~mask);
- local_irq_restore(flags);
-}
-
-static inline void cr4_toggle_bits_irqsoff(unsigned long mask)
-{
- unsigned long cr4;
-
- cr4 = this_cpu_read(cpu_tlbstate.cr4);
- __cr4_set(cr4 ^ mask);
-}
-
-/* Read the CR4 shadow. */
-static inline unsigned long cr4_read_shadow(void)
-{
- return this_cpu_read(cpu_tlbstate.cr4);
-}
-
-/*
- * Mark all other ASIDs as invalid, preserves the current.
- */
-static inline void invalidate_other_asid(void)
-{
- this_cpu_write(cpu_tlbstate.invalidate_other, true);
-}
-
-/*
- * Save some of cr4 feature set we're using (e.g. Pentium 4MB
- * enable and PPro Global page enable), so that any CPU's that boot
- * up after us can get the correct flags. This should only be used
- * during boot on the boot cpu.
- */
extern unsigned long mmu_cr4_features;
extern u32 *trampoline_cr4_features;
-static inline void cr4_set_bits_and_update_boot(unsigned long mask)
-{
- mmu_cr4_features |= mask;
- if (trampoline_cr4_features)
- *trampoline_cr4_features = mmu_cr4_features;
- cr4_set_bits(mask);
-}
-
extern void initialize_tlbstate_and_flush(void);
-
-/*
- * Given an ASID, flush the corresponding user ASID. We can delay this
- * until the next time we switch to it.
- *
- * See SWITCH_TO_USER_CR3.
- */
-static inline void invalidate_user_asid(u16 asid)
-{
- /* There is no user ASID if address space separation is off */
- if (!IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
- return;
-
- /*
- * We only have a single ASID if PCID is off and the CR3
- * write will have flushed it.
- */
- if (!cpu_feature_enabled(X86_FEATURE_PCID))
- return;
-
- if (!static_cpu_has(X86_FEATURE_PTI))
- return;
-
- __set_bit(kern_pcid(asid),
- (unsigned long *)this_cpu_ptr(&cpu_tlbstate.user_pcid_flush_mask));
-}
-
-/*
- * flush the entire current user mapping
- */
-static inline void __native_flush_tlb(void)
-{
- /*
- * Preemption or interrupts must be disabled to protect the access
- * to the per CPU variable and to prevent being preempted between
- * read_cr3() and write_cr3().
- */
- WARN_ON_ONCE(preemptible());
-
- invalidate_user_asid(this_cpu_read(cpu_tlbstate.loaded_mm_asid));
-
- /* If current->mm == NULL then the read_cr3() "borrows" an mm */
- native_write_cr3(__native_read_cr3());
-}
-
-/*
- * flush everything
- */
-static inline void __native_flush_tlb_global(void)
-{
- unsigned long cr4, flags;
-
- if (static_cpu_has(X86_FEATURE_INVPCID)) {
- /*
- * Using INVPCID is considerably faster than a pair of writes
- * to CR4 sandwiched inside an IRQ flag save/restore.
- *
- * Note, this works with CR4.PCIDE=0 or 1.
- */
- invpcid_flush_all();
- return;
- }
-
- /*
- * Read-modify-write to CR4 - protect it from preemption and
- * from interrupts. (Use the raw variant because this code can
- * be called from deep inside debugging code.)
- */
- raw_local_irq_save(flags);
-
- cr4 = this_cpu_read(cpu_tlbstate.cr4);
- /* toggle PGE */
- native_write_cr4(cr4 ^ X86_CR4_PGE);
- /* write old PGE again and flush TLBs */
- native_write_cr4(cr4);
-
- raw_local_irq_restore(flags);
-}
-
-/*
- * flush one page in the user mapping
- */
-static inline void __native_flush_tlb_one_user(unsigned long addr)
-{
- u32 loaded_mm_asid = this_cpu_read(cpu_tlbstate.loaded_mm_asid);
-
- asm volatile("invlpg (%0)" ::"r" (addr) : "memory");
-
- if (!static_cpu_has(X86_FEATURE_PTI))
- return;
-
- /*
- * Some platforms #GP if we call invpcid(type=1/2) before CR4.PCIDE=1.
- * Just use invalidate_user_asid() in case we are called early.
- */
- if (!this_cpu_has(X86_FEATURE_INVPCID_SINGLE))
- invalidate_user_asid(loaded_mm_asid);
- else
- invpcid_flush_one(user_pcid(loaded_mm_asid), addr);
-}
-
-/*
- * flush everything
- */
-static inline void __flush_tlb_all(void)
-{
- /*
- * This is to catch users with enabled preemption and the PGE feature
- * and don't trigger the warning in __native_flush_tlb().
- */
- VM_WARN_ON_ONCE(preemptible());
-
- if (boot_cpu_has(X86_FEATURE_PGE)) {
- __flush_tlb_global();
- } else {
- /*
- * !PGE -> !PCID (setup_pcid()), thus every flush is total.
- */
- __flush_tlb();
- }
-}
-
-/*
- * flush one page in the kernel mapping
- */
-static inline void __flush_tlb_one_kernel(unsigned long addr)
-{
- count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ONE);
-
- /*
- * If PTI is off, then __flush_tlb_one_user() is just INVLPG or its
- * paravirt equivalent. Even with PCID, this is sufficient: we only
- * use PCID if we also use global PTEs for the kernel mapping, and
- * INVLPG flushes global translations across all address spaces.
- *
- * If PTI is on, then the kernel is mapped with non-global PTEs, and
- * __flush_tlb_one_user() will flush the given address for the current
- * kernel address space and for its usermode counterpart, but it does
- * not flush it for other address spaces.
- */
- __flush_tlb_one_user(addr);
-
- if (!static_cpu_has(X86_FEATURE_PTI))
- return;
-
- /*
- * See above. We need to propagate the flush to all other address
- * spaces. In principle, we only need to propagate it to kernelmode
- * address spaces, but the extra bookkeeping we would need is not
- * worth it.
- */
- invalidate_other_asid();
-}
-
-#define TLB_FLUSH_ALL -1UL
/*
* TLB flushing:
@@ -557,27 +201,39 @@
unsigned long start;
unsigned long end;
u64 new_tlb_gen;
+ unsigned int stride_shift;
+ bool freed_tables;
};
-#define local_flush_tlb() __flush_tlb()
+void flush_tlb_local(void);
+void flush_tlb_one_user(unsigned long addr);
+void flush_tlb_one_kernel(unsigned long addr);
+void flush_tlb_others(const struct cpumask *cpumask,
+ const struct flush_tlb_info *info);
-#define flush_tlb_mm(mm) flush_tlb_mm_range(mm, 0UL, TLB_FLUSH_ALL, 0UL)
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#endif
-#define flush_tlb_range(vma, start, end) \
- flush_tlb_mm_range(vma->vm_mm, start, end, vma->vm_flags)
+#define flush_tlb_mm(mm) \
+ flush_tlb_mm_range(mm, 0UL, TLB_FLUSH_ALL, 0UL, true)
+
+#define flush_tlb_range(vma, start, end) \
+ flush_tlb_mm_range((vma)->vm_mm, start, end, \
+ ((vma)->vm_flags & VM_HUGETLB) \
+ ? huge_page_shift(hstate_vma(vma)) \
+ : PAGE_SHIFT, false)
extern void flush_tlb_all(void);
extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
- unsigned long end, unsigned long vmflag);
+ unsigned long end, unsigned int stride_shift,
+ bool freed_tables);
extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long a)
{
- flush_tlb_mm_range(vma->vm_mm, a, a + PAGE_SIZE, VM_NONE);
+ flush_tlb_mm_range(vma->vm_mm, a, a + PAGE_SIZE, PAGE_SHIFT, false);
}
-
-void native_flush_tlb_others(const struct cpumask *cpumask,
- const struct flush_tlb_info *info);
static inline u64 inc_mm_tlb_gen(struct mm_struct *mm)
{
@@ -599,12 +255,6 @@
extern void arch_tlbbatch_flush(struct arch_tlbflush_unmap_batch *batch);
-#ifndef CONFIG_PARAVIRT
-#define flush_tlb_others(mask, info) \
- native_flush_tlb_others(mask, info)
-
-#define paravirt_tlb_remove_table(tlb, page) \
- tlb_remove_page(tlb, (void *)(page))
-#endif
+#endif /* !MODULE */
#endif /* _ASM_X86_TLBFLUSH_H */
--
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