1 files changed, 266 insertions, 152 deletions

diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c
index 8a8d5285144..f4a0e407eee 100644
--- a/arch/um/kernel/tlb.c
+++ b/arch/um/kernel/tlb.c
@@ -1,130 +1,182 @@
 /*
- * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  * Licensed under the GPL
  */
 
 #include "linux/mm.h"
-#include "asm/page.h"
-#include "asm/pgalloc.h"
 #include "asm/pgtable.h"
 #include "asm/tlbflush.h"
-#include "choose-mode.h"
-#include "mode_kern.h"
 #include "as-layout.h"
-#include "tlb.h"
-#include "mem.h"
 #include "mem_user.h"
 #include "os.h"
+#include "skas.h"
+#include "tlb.h"
+
+struct host_vm_change {
+	struct host_vm_op {
+		enum { NONE, MMAP, MUNMAP, MPROTECT } type;
+		union {
+			struct {
+				unsigned long addr;
+				unsigned long len;
+				unsigned int prot;
+				int fd;
+				__u64 offset;
+			} mmap;
+			struct {
+				unsigned long addr;
+				unsigned long len;
+			} munmap;
+			struct {
+				unsigned long addr;
+				unsigned long len;
+				unsigned int prot;
+			} mprotect;
+		} u;
+	} ops[1];
+	int index;
+	struct mm_id *id;
+	void *data;
+	int force;
+};
+
+#define INIT_HVC(mm, force) \
+	((struct host_vm_change) \
+	 { .ops		= { { .type = NONE } },	\
+	   .id		= &mm->context.id, \
+       	   .data	= NULL, \
+	   .index	= 0, \
+	   .force	= force })
+
+static int do_ops(struct host_vm_change *hvc, int end,
+		  int finished)
+{
+	struct host_vm_op *op;
+	int i, ret = 0;
+
+	for (i = 0; i < end && !ret; i++) {
+		op = &hvc->ops[i];
+		switch(op->type) {
+		case MMAP:
+			ret = map(hvc->id, op->u.mmap.addr, op->u.mmap.len,
+				  op->u.mmap.prot, op->u.mmap.fd,
+				  op->u.mmap.offset, finished, &hvc->data);
+			break;
+		case MUNMAP:
+			ret = unmap(hvc->id, op->u.munmap.addr,
+				    op->u.munmap.len, finished, &hvc->data);
+			break;
+		case MPROTECT:
+			ret = protect(hvc->id, op->u.mprotect.addr,
+				      op->u.mprotect.len, op->u.mprotect.prot,
+				      finished, &hvc->data);
+			break;
+		default:
+			printk(KERN_ERR "Unknown op type %d in do_ops\n",
+			       op->type);
+			break;
+		}
+	}
+
+	return ret;
+}
 
 static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
-		    unsigned int prot, struct host_vm_op *ops, int *index,
-		    int last_filled, union mm_context *mmu, void **flush,
-		    int (*do_ops)(union mm_context *, struct host_vm_op *,
-				  int, int, void **))
+		    unsigned int prot, struct host_vm_change *hvc)
 {
 	__u64 offset;
 	struct host_vm_op *last;
 	int fd, ret = 0;
 
 	fd = phys_mapping(phys, &offset);
-	if(*index != -1){
-		last = &ops[*index];
-		if((last->type == MMAP) &&
+	if (hvc->index != 0) {
+		last = &hvc->ops[hvc->index - 1];
+		if ((last->type == MMAP) &&
 		   (last->u.mmap.addr + last->u.mmap.len == virt) &&
 		   (last->u.mmap.prot == prot) && (last->u.mmap.fd == fd) &&
-		   (last->u.mmap.offset + last->u.mmap.len == offset)){
+		   (last->u.mmap.offset + last->u.mmap.len == offset)) {
 			last->u.mmap.len += len;
 			return 0;
 		}
 	}
 
-	if(*index == last_filled){
-		ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
-		*index = -1;
+	if (hvc->index == ARRAY_SIZE(hvc->ops)) {
+		ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
+		hvc->index = 0;
 	}
 
-	ops[++*index] = ((struct host_vm_op) { .type	= MMAP,
-			     			.u = { .mmap = {
-						       .addr	= virt,
-						       .len	= len,
-						       .prot	= prot,
-						       .fd	= fd,
-						       .offset	= offset }
+	hvc->ops[hvc->index++] = ((struct host_vm_op)
+				  { .type	= MMAP,
+				    .u = { .mmap = { .addr	= virt,
+						     .len	= len,
+						     .prot	= prot,
+						     .fd	= fd,
+						     .offset	= offset }
 			   } });
 	return ret;
 }
 
 static int add_munmap(unsigned long addr, unsigned long len,
-		      struct host_vm_op *ops, int *index, int last_filled,
-		      union mm_context *mmu, void **flush,
-		      int (*do_ops)(union mm_context *, struct host_vm_op *,
-				    int, int, void **))
+		      struct host_vm_change *hvc)
 {
 	struct host_vm_op *last;
 	int ret = 0;
 
-	if(*index != -1){
-		last = &ops[*index];
-		if((last->type == MUNMAP) &&
-		   (last->u.munmap.addr + last->u.mmap.len == addr)){
+	if (hvc->index != 0) {
+		last = &hvc->ops[hvc->index - 1];
+		if ((last->type == MUNMAP) &&
+		   (last->u.munmap.addr + last->u.mmap.len == addr)) {
 			last->u.munmap.len += len;
 			return 0;
 		}
 	}
 
-	if(*index == last_filled){
-		ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
-		*index = -1;
+	if (hvc->index == ARRAY_SIZE(hvc->ops)) {
+		ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
+		hvc->index = 0;
 	}
 
-	ops[++*index] = ((struct host_vm_op) { .type	= MUNMAP,
-			     		       .u = { .munmap = {
-						        .addr	= addr,
-							.len	= len } } });
+	hvc->ops[hvc->index++] = ((struct host_vm_op)
+				  { .type	= MUNMAP,
+			     	    .u = { .munmap = { .addr	= addr,
+						       .len	= len } } });
 	return ret;
 }
 
 static int add_mprotect(unsigned long addr, unsigned long len,
-			unsigned int prot, struct host_vm_op *ops, int *index,
-			int last_filled, union mm_context *mmu, void **flush,
-			int (*do_ops)(union mm_context *, struct host_vm_op *,
-				      int, int, void **))
+			unsigned int prot, struct host_vm_change *hvc)
 {
 	struct host_vm_op *last;
 	int ret = 0;
 
-	if(*index != -1){
-		last = &ops[*index];
-		if((last->type == MPROTECT) &&
+	if (hvc->index != 0) {
+		last = &hvc->ops[hvc->index - 1];
+		if ((last->type == MPROTECT) &&
 		   (last->u.mprotect.addr + last->u.mprotect.len == addr) &&
-		   (last->u.mprotect.prot == prot)){
+		   (last->u.mprotect.prot == prot)) {
 			last->u.mprotect.len += len;
 			return 0;
 		}
 	}
 
-	if(*index == last_filled){
-		ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
-		*index = -1;
+	if (hvc->index == ARRAY_SIZE(hvc->ops)) {
+		ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
+		hvc->index = 0;
 	}
 
-	ops[++*index] = ((struct host_vm_op) { .type	= MPROTECT,
-			     		       .u = { .mprotect = {
-						       .addr	= addr,
-						       .len	= len,
-						       .prot	= prot } } });
+	hvc->ops[hvc->index++] = ((struct host_vm_op)
+				  { .type	= MPROTECT,
+			     	    .u = { .mprotect = { .addr	= addr,
+							 .len	= len,
+							 .prot	= prot } } });
 	return ret;
 }
 
 #define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
 
 static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
-				   unsigned long end, struct host_vm_op *ops,
-				   int last_op, int *op_index, int force,
-				   union mm_context *mmu, void **flush,
-				   int (*do_ops)(union mm_context *,
-						 struct host_vm_op *, int, int,
-						 void **))
+				   unsigned long end,
+				   struct host_vm_change *hvc)
 {
 	pte_t *pte;
 	int r, w, x, prot, ret = 0;
@@ -142,29 +194,22 @@ static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
 		}
 		prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
 			(x ? UM_PROT_EXEC : 0));
-		if(force || pte_newpage(*pte)){
-			if(pte_present(*pte))
+		if (hvc->force || pte_newpage(*pte)) {
+			if (pte_present(*pte))
 				ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
-					       PAGE_SIZE, prot, ops, op_index,
-					       last_op, mmu, flush, do_ops);
-			else ret = add_munmap(addr, PAGE_SIZE, ops, op_index,
-					      last_op, mmu, flush, do_ops);
+					       PAGE_SIZE, prot, hvc);
+			else ret = add_munmap(addr, PAGE_SIZE, hvc);
 		}
-		else if(pte_newprot(*pte))
-			ret = add_mprotect(addr, PAGE_SIZE, prot, ops, op_index,
-					   last_op, mmu, flush, do_ops);
+		else if (pte_newprot(*pte))
+			ret = add_mprotect(addr, PAGE_SIZE, prot, hvc);
 		*pte = pte_mkuptodate(*pte);
 	} while (pte++, addr += PAGE_SIZE, ((addr != end) && !ret));
 	return ret;
 }
 
 static inline int update_pmd_range(pud_t *pud, unsigned long addr,
-				   unsigned long end, struct host_vm_op *ops,
-				   int last_op, int *op_index, int force,
-				   union mm_context *mmu, void **flush,
-				   int (*do_ops)(union mm_context *,
-						 struct host_vm_op *, int, int,
-						 void **))
+				   unsigned long end,
+				   struct host_vm_change *hvc)
 {
 	pmd_t *pmd;
 	unsigned long next;
@@ -173,28 +218,20 @@ static inline int update_pmd_range(pud_t *pud, unsigned long addr,
 	pmd = pmd_offset(pud, addr);
 	do {
 		next = pmd_addr_end(addr, end);
-		if(!pmd_present(*pmd)){
-			if(force || pmd_newpage(*pmd)){
-				ret = add_munmap(addr, next - addr, ops,
-						 op_index, last_op, mmu,
-						 flush, do_ops);
+		if (!pmd_present(*pmd)) {
+			if (hvc->force || pmd_newpage(*pmd)) {
+				ret = add_munmap(addr, next - addr, hvc);
 				pmd_mkuptodate(*pmd);
 			}
 		}
-		else ret = update_pte_range(pmd, addr, next, ops, last_op,
-					    op_index, force, mmu, flush,
-					    do_ops);
+		else ret = update_pte_range(pmd, addr, next, hvc);
 	} while (pmd++, addr = next, ((addr != end) && !ret));
 	return ret;
 }
 
 static inline int update_pud_range(pgd_t *pgd, unsigned long addr,
-				   unsigned long end, struct host_vm_op *ops,
-				   int last_op, int *op_index, int force,
-				   union mm_context *mmu, void **flush,
-				   int (*do_ops)(union mm_context *,
-						 struct host_vm_op *, int, int,
-						 void **))
+				   unsigned long end,
+				   struct host_vm_change *hvc)
 {
 	pud_t *pud;
 	unsigned long next;
@@ -203,56 +240,45 @@ static inline int update_pud_range(pgd_t *pgd, unsigned long addr,
 	pud = pud_offset(pgd, addr);
 	do {
 		next = pud_addr_end(addr, end);
-		if(!pud_present(*pud)){
-			if(force || pud_newpage(*pud)){
-				ret = add_munmap(addr, next - addr, ops,
-						 op_index, last_op, mmu,
-						 flush, do_ops);
+		if (!pud_present(*pud)) {
+			if (hvc->force || pud_newpage(*pud)) {
+				ret = add_munmap(addr, next - addr, hvc);
 				pud_mkuptodate(*pud);
 			}
 		}
-		else ret = update_pmd_range(pud, addr, next, ops, last_op,
-					    op_index, force, mmu, flush,
-					    do_ops);
+		else ret = update_pmd_range(pud, addr, next, hvc);
 	} while (pud++, addr = next, ((addr != end) && !ret));
 	return ret;
 }
 
 void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
-		      unsigned long end_addr, int force,
-		      int (*do_ops)(union mm_context *, struct host_vm_op *,
-				    int, int, void **))
+		      unsigned long end_addr, int force)
 {
 	pgd_t *pgd;
-	union mm_context *mmu = &mm->context;
-	struct host_vm_op ops[1];
+	struct host_vm_change hvc;
 	unsigned long addr = start_addr, next;
-	int ret = 0, last_op = ARRAY_SIZE(ops) - 1, op_index = -1;
-	void *flush = NULL;
+	int ret = 0;
 
-	ops[0].type = NONE;
+	hvc = INIT_HVC(mm, force);
 	pgd = pgd_offset(mm, addr);
 	do {
 		next = pgd_addr_end(addr, end_addr);
-		if(!pgd_present(*pgd)){
-			if (force || pgd_newpage(*pgd)){
-				ret = add_munmap(addr, next - addr, ops,
-						 &op_index, last_op, mmu,
-						 &flush, do_ops);
+		if (!pgd_present(*pgd)) {
+			if (force || pgd_newpage(*pgd)) {
+				ret = add_munmap(addr, next - addr, &hvc);
 				pgd_mkuptodate(*pgd);
 			}
 		}
-		else ret = update_pud_range(pgd, addr, next, ops, last_op,
-					    &op_index, force, mmu, &flush,
-					    do_ops);
+		else ret = update_pud_range(pgd, addr, next, &hvc);
 	} while (pgd++, addr = next, ((addr != end_addr) && !ret));
 
-	if(!ret)
-		ret = (*do_ops)(mmu, ops, op_index, 1, &flush);
+	if (!ret)
+		ret = do_ops(&hvc, hvc.index, 1);
 
 	/* This is not an else because ret is modified above */
-	if(ret) {
-		printk("fix_range_common: failed, killing current process\n");
+	if (ret) {
+		printk(KERN_ERR "fix_range_common: failed, killing current "
+		       "process\n");
 		force_sig(SIGKILL, current);
 	}
 }
@@ -268,17 +294,17 @@ int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
 	int updated = 0, err;
 
 	mm = &init_mm;
-	for(addr = start; addr < end;){
+	for (addr = start; addr < end;) {
 		pgd = pgd_offset(mm, addr);
-		if(!pgd_present(*pgd)){
+		if (!pgd_present(*pgd)) {
 			last = ADD_ROUND(addr, PGDIR_SIZE);
-			if(last > end)
+			if (last > end)
 				last = end;
-			if(pgd_newpage(*pgd)){
+			if (pgd_newpage(*pgd)) {
 				updated = 1;
 				err = os_unmap_memory((void *) addr,
 						      last - addr);
-				if(err < 0)
+				if (err < 0)
 					panic("munmap failed, errno = %d\n",
 					      -err);
 			}
@@ -287,15 +313,15 @@ int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
 		}
 
 		pud = pud_offset(pgd, addr);
-		if(!pud_present(*pud)){
+		if (!pud_present(*pud)) {
 			last = ADD_ROUND(addr, PUD_SIZE);
-			if(last > end)
+			if (last > end)
 				last = end;
-			if(pud_newpage(*pud)){
+			if (pud_newpage(*pud)) {
 				updated = 1;
 				err = os_unmap_memory((void *) addr,
 						      last - addr);
-				if(err < 0)
+				if (err < 0)
 					panic("munmap failed, errno = %d\n",
 					      -err);
 			}
@@ -304,15 +330,15 @@ int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
 		}
 
 		pmd = pmd_offset(pud, addr);
-		if(!pmd_present(*pmd)){
+		if (!pmd_present(*pmd)) {
 			last = ADD_ROUND(addr, PMD_SIZE);
-			if(last > end)
+			if (last > end)
 				last = end;
-			if(pmd_newpage(*pmd)){
+			if (pmd_newpage(*pmd)) {
 				updated = 1;
 				err = os_unmap_memory((void *) addr,
 						      last - addr);
-				if(err < 0)
+				if (err < 0)
 					panic("munmap failed, errno = %d\n",
 					      -err);
 			}
@@ -321,45 +347,110 @@ int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
 		}
 
 		pte = pte_offset_kernel(pmd, addr);
-		if(!pte_present(*pte) || pte_newpage(*pte)){
+		if (!pte_present(*pte) || pte_newpage(*pte)) {
 			updated = 1;
 			err = os_unmap_memory((void *) addr,
 					      PAGE_SIZE);
-			if(err < 0)
+			if (err < 0)
 				panic("munmap failed, errno = %d\n",
 				      -err);
-			if(pte_present(*pte))
+			if (pte_present(*pte))
 				map_memory(addr,
 					   pte_val(*pte) & PAGE_MASK,
 					   PAGE_SIZE, 1, 1, 1);
 		}
-		else if(pte_newprot(*pte)){
+		else if (pte_newprot(*pte)) {
 			updated = 1;
 			os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
 		}
 		addr += PAGE_SIZE;
 	}
-	return(updated);
+	return updated;
+}
+
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
+{
+	pgd_t *pgd;
+	pud_t *pud;
+	pmd_t *pmd;
+	pte_t *pte;
+	struct mm_struct *mm = vma->vm_mm;
+	void *flush = NULL;
+	int r, w, x, prot, err = 0;
+	struct mm_id *mm_id;
+
+	address &= PAGE_MASK;
+	pgd = pgd_offset(mm, address);
+	if (!pgd_present(*pgd))
+		goto kill;
+
+	pud = pud_offset(pgd, address);
+	if (!pud_present(*pud))
+		goto kill;
+
+	pmd = pmd_offset(pud, address);
+	if (!pmd_present(*pmd))
+		goto kill;
+
+	pte = pte_offset_kernel(pmd, address);
+
+	r = pte_read(*pte);
+	w = pte_write(*pte);
+	x = pte_exec(*pte);
+	if (!pte_young(*pte)) {
+		r = 0;
+		w = 0;
+	} else if (!pte_dirty(*pte)) {
+		w = 0;
+	}
+
+	mm_id = &mm->context.id;
+	prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
+		(x ? UM_PROT_EXEC : 0));
+	if (pte_newpage(*pte)) {
+		if (pte_present(*pte)) {
+			unsigned long long offset;
+			int fd;
+
+			fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
+			err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
+				  1, &flush);
+		}
+		else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
+	}
+	else if (pte_newprot(*pte))
+		err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
+
+	if (err)
+		goto kill;
+
+	*pte = pte_mkuptodate(*pte);
+
+	return;
+
+kill:
+	printk(KERN_ERR "Failed to flush page for address 0x%lx\n", address);
+	force_sig(SIGKILL, current);
 }
 
 pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
 {
-	return(pgd_offset(mm, address));
+	return pgd_offset(mm, address);
 }
 
 pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address)
 {
-	return(pud_offset(pgd, address));
+	return pud_offset(pgd, address);
 }
 
 pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address)
 {
-	return(pmd_offset(pud, address));
+	return pmd_offset(pud, address);
 }
 
 pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address)
 {
-	return(pte_offset_kernel(pmd, address));
+	return pte_offset_kernel(pmd, address);
 }
 
 pte_t *addr_pte(struct task_struct *task, unsigned long addr)
@@ -368,7 +459,7 @@ pte_t *addr_pte(struct task_struct *task, unsigned long addr)
 	pud_t *pud = pud_offset(pgd, addr);
 	pmd_t *pmd = pmd_offset(pud, addr);
 
-	return(pte_offset_map(pmd, addr));
+	return pte_offset_map(pmd, addr);
 }
 
 void flush_tlb_all(void)
@@ -378,35 +469,58 @@ void flush_tlb_all(void)
 
 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
 {
-	CHOOSE_MODE_PROC(flush_tlb_kernel_range_tt,
-			 flush_tlb_kernel_range_common, start, end);
+	flush_tlb_kernel_range_common(start, end);
 }
 
 void flush_tlb_kernel_vm(void)
 {
-	CHOOSE_MODE(flush_tlb_kernel_vm_tt(),
-		    flush_tlb_kernel_range_common(start_vm, end_vm));
+	flush_tlb_kernel_range_common(start_vm, end_vm);
 }
 
 void __flush_tlb_one(unsigned long addr)
 {
-	CHOOSE_MODE_PROC(__flush_tlb_one_tt, __flush_tlb_one_skas, addr);
+	flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
+}
+
+static void fix_range(struct mm_struct *mm, unsigned long start_addr,
+		      unsigned long end_addr, int force)
+{
+	if (!proc_mm && (end_addr > STUB_START))
+		end_addr = STUB_START;
+
+	fix_range_common(mm, start_addr, end_addr, force);
 }
 
 void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
 		     unsigned long end)
 {
-	CHOOSE_MODE_PROC(flush_tlb_range_tt, flush_tlb_range_skas, vma, start,
-			 end);
+	if (vma->vm_mm == NULL)
+		flush_tlb_kernel_range_common(start, end);
+	else fix_range(vma->vm_mm, start, end, 0);
 }
 
 void flush_tlb_mm(struct mm_struct *mm)
 {
-	CHOOSE_MODE_PROC(flush_tlb_mm_tt, flush_tlb_mm_skas, mm);
+	unsigned long end;
+
+	/*
+	 * Don't bother flushing if this address space is about to be
+	 * destroyed.
+	 */
+	if (atomic_read(&mm->mm_users) == 0)
+		return;
+
+	end = proc_mm ? task_size : STUB_START;
+	fix_range(mm, 0, end, 0);
 }
 
 void force_flush_all(void)
 {
-	CHOOSE_MODE(force_flush_all_tt(), force_flush_all_skas());
-}
+	struct mm_struct *mm = current->mm;
+	struct vm_area_struct *vma = mm->mmap;
 
+	while (vma != NULL) {
+		fix_range(mm, vma->vm_start, vma->vm_end, 1);
+		vma = vma->vm_next;
+	}
+}