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Diffstat (limited to 'arch/powerpc/mm/tlb_nohash.c')
-rw-r--r--arch/powerpc/mm/tlb_nohash.c268
1 files changed, 253 insertions, 15 deletions
diff --git a/arch/powerpc/mm/tlb_nohash.c b/arch/powerpc/mm/tlb_nohash.c
index ad2eb4d34dd..2fbc680c2c7 100644
--- a/arch/powerpc/mm/tlb_nohash.c
+++ b/arch/powerpc/mm/tlb_nohash.c
@@ -7,8 +7,8 @@
*
* -- BenH
*
- * Copyright 2008 Ben Herrenschmidt <benh@kernel.crashing.org>
- * IBM Corp.
+ * Copyright 2008,2009 Ben Herrenschmidt <benh@kernel.crashing.org>
+ * IBM Corp.
*
* Derived from arch/ppc/mm/init.c:
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
@@ -34,12 +34,71 @@
#include <linux/pagemap.h>
#include <linux/preempt.h>
#include <linux/spinlock.h>
+#include <linux/lmb.h>
#include <asm/tlbflush.h>
#include <asm/tlb.h>
+#include <asm/code-patching.h>
#include "mmu_decl.h"
+#ifdef CONFIG_PPC_BOOK3E
+struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT] = {
+ [MMU_PAGE_4K] = {
+ .shift = 12,
+ .enc = BOOK3E_PAGESZ_4K,
+ },
+ [MMU_PAGE_16K] = {
+ .shift = 14,
+ .enc = BOOK3E_PAGESZ_16K,
+ },
+ [MMU_PAGE_64K] = {
+ .shift = 16,
+ .enc = BOOK3E_PAGESZ_64K,
+ },
+ [MMU_PAGE_1M] = {
+ .shift = 20,
+ .enc = BOOK3E_PAGESZ_1M,
+ },
+ [MMU_PAGE_16M] = {
+ .shift = 24,
+ .enc = BOOK3E_PAGESZ_16M,
+ },
+ [MMU_PAGE_256M] = {
+ .shift = 28,
+ .enc = BOOK3E_PAGESZ_256M,
+ },
+ [MMU_PAGE_1G] = {
+ .shift = 30,
+ .enc = BOOK3E_PAGESZ_1GB,
+ },
+};
+static inline int mmu_get_tsize(int psize)
+{
+ return mmu_psize_defs[psize].enc;
+}
+#else
+static inline int mmu_get_tsize(int psize)
+{
+ /* This isn't used on !Book3E for now */
+ return 0;
+}
+#endif
+
+/* The variables below are currently only used on 64-bit Book3E
+ * though this will probably be made common with other nohash
+ * implementations at some point
+ */
+#ifdef CONFIG_PPC64
+
+int mmu_linear_psize; /* Page size used for the linear mapping */
+int mmu_pte_psize; /* Page size used for PTE pages */
+int mmu_vmemmap_psize; /* Page size used for the virtual mem map */
+int book3e_htw_enabled; /* Is HW tablewalk enabled ? */
+unsigned long linear_map_top; /* Top of linear mapping */
+
+#endif /* CONFIG_PPC64 */
+
/*
* Base TLB flushing operations:
*
@@ -67,18 +126,24 @@ void local_flush_tlb_mm(struct mm_struct *mm)
}
EXPORT_SYMBOL(local_flush_tlb_mm);
-void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
+void __local_flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr,
+ int tsize, int ind)
{
unsigned int pid;
preempt_disable();
- pid = vma ? vma->vm_mm->context.id : 0;
+ pid = mm ? mm->context.id : 0;
if (pid != MMU_NO_CONTEXT)
- _tlbil_va(vmaddr, pid);
+ _tlbil_va(vmaddr, pid, tsize, ind);
preempt_enable();
}
-EXPORT_SYMBOL(local_flush_tlb_page);
+void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
+{
+ __local_flush_tlb_page(vma ? vma->vm_mm : NULL, vmaddr,
+ mmu_get_tsize(mmu_virtual_psize), 0);
+}
+EXPORT_SYMBOL(local_flush_tlb_page);
/*
* And here are the SMP non-local implementations
@@ -87,9 +152,17 @@ EXPORT_SYMBOL(local_flush_tlb_page);
static DEFINE_SPINLOCK(tlbivax_lock);
+static int mm_is_core_local(struct mm_struct *mm)
+{
+ return cpumask_subset(mm_cpumask(mm),
+ topology_thread_cpumask(smp_processor_id()));
+}
+
struct tlb_flush_param {
unsigned long addr;
unsigned int pid;
+ unsigned int tsize;
+ unsigned int ind;
};
static void do_flush_tlb_mm_ipi(void *param)
@@ -103,7 +176,7 @@ static void do_flush_tlb_page_ipi(void *param)
{
struct tlb_flush_param *p = param;
- _tlbil_va(p->addr, p->pid);
+ _tlbil_va(p->addr, p->pid, p->tsize, p->ind);
}
@@ -131,7 +204,7 @@ void flush_tlb_mm(struct mm_struct *mm)
pid = mm->context.id;
if (unlikely(pid == MMU_NO_CONTEXT))
goto no_context;
- if (!cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id()))) {
+ if (!mm_is_core_local(mm)) {
struct tlb_flush_param p = { .pid = pid };
/* Ignores smp_processor_id() even if set. */
smp_call_function_many(mm_cpumask(mm),
@@ -143,37 +216,49 @@ void flush_tlb_mm(struct mm_struct *mm)
}
EXPORT_SYMBOL(flush_tlb_mm);
-void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
+void __flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr,
+ int tsize, int ind)
{
struct cpumask *cpu_mask;
unsigned int pid;
preempt_disable();
- pid = vma ? vma->vm_mm->context.id : 0;
+ pid = mm ? mm->context.id : 0;
if (unlikely(pid == MMU_NO_CONTEXT))
goto bail;
- cpu_mask = mm_cpumask(vma->vm_mm);
- if (!cpumask_equal(cpu_mask, cpumask_of(smp_processor_id()))) {
+ cpu_mask = mm_cpumask(mm);
+ if (!mm_is_core_local(mm)) {
/* If broadcast tlbivax is supported, use it */
if (mmu_has_feature(MMU_FTR_USE_TLBIVAX_BCAST)) {
int lock = mmu_has_feature(MMU_FTR_LOCK_BCAST_INVAL);
if (lock)
spin_lock(&tlbivax_lock);
- _tlbivax_bcast(vmaddr, pid);
+ _tlbivax_bcast(vmaddr, pid, tsize, ind);
if (lock)
spin_unlock(&tlbivax_lock);
goto bail;
} else {
- struct tlb_flush_param p = { .pid = pid, .addr = vmaddr };
+ struct tlb_flush_param p = {
+ .pid = pid,
+ .addr = vmaddr,
+ .tsize = tsize,
+ .ind = ind,
+ };
/* Ignores smp_processor_id() even if set in cpu_mask */
smp_call_function_many(cpu_mask,
do_flush_tlb_page_ipi, &p, 1);
}
}
- _tlbil_va(vmaddr, pid);
+ _tlbil_va(vmaddr, pid, tsize, ind);
bail:
preempt_enable();
}
+
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
+{
+ __flush_tlb_page(vma ? vma->vm_mm : NULL, vmaddr,
+ mmu_get_tsize(mmu_virtual_psize), 0);
+}
EXPORT_SYMBOL(flush_tlb_page);
#endif /* CONFIG_SMP */
@@ -207,3 +292,156 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
flush_tlb_mm(vma->vm_mm);
}
EXPORT_SYMBOL(flush_tlb_range);
+
+void tlb_flush(struct mmu_gather *tlb)
+{
+ flush_tlb_mm(tlb->mm);
+
+ /* Push out batch of freed page tables */
+ pte_free_finish();
+}
+
+/*
+ * Below are functions specific to the 64-bit variant of Book3E though that
+ * may change in the future
+ */
+
+#ifdef CONFIG_PPC64
+
+/*
+ * Handling of virtual linear page tables or indirect TLB entries
+ * flushing when PTE pages are freed
+ */
+void tlb_flush_pgtable(struct mmu_gather *tlb, unsigned long address)
+{
+ int tsize = mmu_psize_defs[mmu_pte_psize].enc;
+
+ if (book3e_htw_enabled) {
+ unsigned long start = address & PMD_MASK;
+ unsigned long end = address + PMD_SIZE;
+ unsigned long size = 1UL << mmu_psize_defs[mmu_pte_psize].shift;
+
+ /* This isn't the most optimal, ideally we would factor out the
+ * while preempt & CPU mask mucking around, or even the IPI but
+ * it will do for now
+ */
+ while (start < end) {
+ __flush_tlb_page(tlb->mm, start, tsize, 1);
+ start += size;
+ }
+ } else {
+ unsigned long rmask = 0xf000000000000000ul;
+ unsigned long rid = (address & rmask) | 0x1000000000000000ul;
+ unsigned long vpte = address & ~rmask;
+
+#ifdef CONFIG_PPC_64K_PAGES
+ vpte = (vpte >> (PAGE_SHIFT - 4)) & ~0xfffful;
+#else
+ vpte = (vpte >> (PAGE_SHIFT - 3)) & ~0xffful;
+#endif
+ vpte |= rid;
+ __flush_tlb_page(tlb->mm, vpte, tsize, 0);
+ }
+}
+
+/*
+ * Early initialization of the MMU TLB code
+ */
+static void __early_init_mmu(int boot_cpu)
+{
+ extern unsigned int interrupt_base_book3e;
+ extern unsigned int exc_data_tlb_miss_htw_book3e;
+ extern unsigned int exc_instruction_tlb_miss_htw_book3e;
+
+ unsigned int *ibase = &interrupt_base_book3e;
+ unsigned int mas4;
+
+ /* XXX This will have to be decided at runtime, but right
+ * now our boot and TLB miss code hard wires it. Ideally
+ * we should find out a suitable page size and patch the
+ * TLB miss code (either that or use the PACA to store
+ * the value we want)
+ */
+ mmu_linear_psize = MMU_PAGE_1G;
+
+ /* XXX This should be decided at runtime based on supported
+ * page sizes in the TLB, but for now let's assume 16M is
+ * always there and a good fit (which it probably is)
+ */
+ mmu_vmemmap_psize = MMU_PAGE_16M;
+
+ /* Check if HW tablewalk is present, and if yes, enable it by:
+ *
+ * - patching the TLB miss handlers to branch to the
+ * one dedicates to it
+ *
+ * - setting the global book3e_htw_enabled
+ *
+ * - Set MAS4:INDD and default page size
+ */
+
+ /* XXX This code only checks for TLB 0 capabilities and doesn't
+ * check what page size combos are supported by the HW. It
+ * also doesn't handle the case where a separate array holds
+ * the IND entries from the array loaded by the PT.
+ */
+ if (boot_cpu) {
+ unsigned int tlb0cfg = mfspr(SPRN_TLB0CFG);
+
+ /* Check if HW loader is supported */
+ if ((tlb0cfg & TLBnCFG_IND) &&
+ (tlb0cfg & TLBnCFG_PT)) {
+ patch_branch(ibase + (0x1c0 / 4),
+ (unsigned long)&exc_data_tlb_miss_htw_book3e, 0);
+ patch_branch(ibase + (0x1e0 / 4),
+ (unsigned long)&exc_instruction_tlb_miss_htw_book3e, 0);
+ book3e_htw_enabled = 1;
+ }
+ pr_info("MMU: Book3E Page Tables %s\n",
+ book3e_htw_enabled ? "Enabled" : "Disabled");
+ }
+
+ /* Set MAS4 based on page table setting */
+
+ mas4 = 0x4 << MAS4_WIMGED_SHIFT;
+ if (book3e_htw_enabled) {
+ mas4 |= mas4 | MAS4_INDD;
+#ifdef CONFIG_PPC_64K_PAGES
+ mas4 |= BOOK3E_PAGESZ_256M << MAS4_TSIZED_SHIFT;
+ mmu_pte_psize = MMU_PAGE_256M;
+#else
+ mas4 |= BOOK3E_PAGESZ_1M << MAS4_TSIZED_SHIFT;
+ mmu_pte_psize = MMU_PAGE_1M;
+#endif
+ } else {
+#ifdef CONFIG_PPC_64K_PAGES
+ mas4 |= BOOK3E_PAGESZ_64K << MAS4_TSIZED_SHIFT;
+#else
+ mas4 |= BOOK3E_PAGESZ_4K << MAS4_TSIZED_SHIFT;
+#endif
+ mmu_pte_psize = mmu_virtual_psize;
+ }
+ mtspr(SPRN_MAS4, mas4);
+
+ /* Set the global containing the top of the linear mapping
+ * for use by the TLB miss code
+ */
+ linear_map_top = lmb_end_of_DRAM();
+
+ /* A sync won't hurt us after mucking around with
+ * the MMU configuration
+ */
+ mb();
+}
+
+void __init early_init_mmu(void)
+{
+ __early_init_mmu(1);
+}
+
+void __cpuinit early_init_mmu_secondary(void)
+{
+ __early_init_mmu(0);
+}
+
+#endif /* CONFIG_PPC64 */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 11:49:52 +0000