1 files changed, 101 insertions, 97 deletions

diff --git a/arch/ppc64/mm/init.c b/arch/ppc64/mm/init.c
index a7149b9..cf33d7e 100644
--- a/arch/ppc64/mm/init.c
+++ b/arch/ppc64/mm/init.c
@@ -136,14 +136,78 @@ void iounmap(volatile void __iomem *addr)
 
 #else
 
+static void unmap_im_area_pte(pmd_t *pmd, unsigned long addr,
+				  unsigned long end)
+{
+	pte_t *pte;
+
+	pte = pte_offset_kernel(pmd, addr);
+	do {
+		pte_t ptent = ptep_get_and_clear(&ioremap_mm, addr, pte);
+		WARN_ON(!pte_none(ptent) && !pte_present(ptent));
+	} while (pte++, addr += PAGE_SIZE, addr != end);
+}
+
+static inline void unmap_im_area_pmd(pud_t *pud, unsigned long addr,
+				     unsigned long end)
+{
+	pmd_t *pmd;
+	unsigned long next;
+
+	pmd = pmd_offset(pud, addr);
+	do {
+		next = pmd_addr_end(addr, end);
+		if (pmd_none_or_clear_bad(pmd))
+			continue;
+		unmap_im_area_pte(pmd, addr, next);
+	} while (pmd++, addr = next, addr != end);
+}
+
+static inline void unmap_im_area_pud(pgd_t *pgd, unsigned long addr,
+				     unsigned long end)
+{
+	pud_t *pud;
+	unsigned long next;
+
+	pud = pud_offset(pgd, addr);
+	do {
+		next = pud_addr_end(addr, end);
+		if (pud_none_or_clear_bad(pud))
+			continue;
+		unmap_im_area_pmd(pud, addr, next);
+	} while (pud++, addr = next, addr != end);
+}
+
+static void unmap_im_area(unsigned long addr, unsigned long end)
+{
+	struct mm_struct *mm = &ioremap_mm;
+	unsigned long next;
+	pgd_t *pgd;
+
+	spin_lock(&mm->page_table_lock);
+
+	pgd = pgd_offset_i(addr);
+	flush_cache_vunmap(addr, end);
+	do {
+		next = pgd_addr_end(addr, end);
+		if (pgd_none_or_clear_bad(pgd))
+			continue;
+		unmap_im_area_pud(pgd, addr, next);
+	} while (pgd++, addr = next, addr != end);
+	flush_tlb_kernel_range(start, end);
+
+	spin_unlock(&mm->page_table_lock);
+}
+
 /*
  * map_io_page currently only called by __ioremap
  * map_io_page adds an entry to the ioremap page table
  * and adds an entry to the HPT, possibly bolting it
  */
-static void map_io_page(unsigned long ea, unsigned long pa, int flags)
+static int map_io_page(unsigned long ea, unsigned long pa, int flags)
 {
 	pgd_t *pgdp;
+	pud_t *pudp;
 	pmd_t *pmdp;
 	pte_t *ptep;
 	unsigned long vsid;
@@ -151,9 +215,15 @@ static void map_io_page(unsigned long ea, unsigned long pa, int flags)
 	if (mem_init_done) {
 		spin_lock(&ioremap_mm.page_table_lock);
 		pgdp = pgd_offset_i(ea);
-		pmdp = pmd_alloc(&ioremap_mm, pgdp, ea);
+		pudp = pud_alloc(&ioremap_mm, pgdp, ea);
+		if (!pudp)
+			return -ENOMEM;
+		pmdp = pmd_alloc(&ioremap_mm, pudp, ea);
+		if (!pmdp)
+			return -ENOMEM;
 		ptep = pte_alloc_kernel(&ioremap_mm, pmdp, ea);
-
+		if (!ptep)
+			return -ENOMEM;
 		pa = abs_to_phys(pa);
 		set_pte_at(&ioremap_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT,
 							  __pgprot(flags)));
@@ -181,6 +251,7 @@ static void map_io_page(unsigned long ea, unsigned long pa, int flags)
 			panic("map_io_page: could not insert mapping");
 		}
 	}
+	return 0;
 }
 
 
@@ -194,9 +265,14 @@ static void __iomem * __ioremap_com(unsigned long addr, unsigned long pa,
 		flags |= pgprot_val(PAGE_KERNEL);
 
 	for (i = 0; i < size; i += PAGE_SIZE)
-		map_io_page(ea+i, pa+i, flags);
+		if (map_io_page(ea+i, pa+i, flags))
+			goto failure;
 
 	return (void __iomem *) (ea + (addr & ~PAGE_MASK));
+ failure:
+	if (mem_init_done)
+		unmap_im_area(ea, ea + size);
+	return NULL;
 }
 
 
@@ -206,10 +282,11 @@ ioremap(unsigned long addr, unsigned long size)
 	return __ioremap(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED);
 }
 
-void __iomem *
-__ioremap(unsigned long addr, unsigned long size, unsigned long flags)
+void __iomem * __ioremap(unsigned long addr, unsigned long size,
+			 unsigned long flags)
 {
 	unsigned long pa, ea;
+	void __iomem *ret;
 
 	/*
 	 * Choose an address to map it to.
@@ -232,12 +309,16 @@ __ioremap(unsigned long addr, unsigned long size, unsigned long flags)
 		if (area == NULL)
 			return NULL;
 		ea = (unsigned long)(area->addr);
+		ret = __ioremap_com(addr, pa, ea, size, flags);
+		if (!ret)
+			im_free(area->addr);
 	} else {
 		ea = ioremap_bot;
-		ioremap_bot += size;
+		ret = __ioremap_com(addr, pa, ea, size, flags);
+		if (ret)
+			ioremap_bot += size;
 	}
-
-	return __ioremap_com(addr, pa, ea, size, flags);
+	return ret;
 }
 
 #define IS_PAGE_ALIGNED(_val) ((_val) == ((_val) & PAGE_MASK))
@@ -246,6 +327,7 @@ int __ioremap_explicit(unsigned long pa, unsigned long ea,
 		       unsigned long size, unsigned long flags)
 {
 	struct vm_struct *area;
+	void __iomem *ret;
 	
 	/* For now, require page-aligned values for pa, ea, and size */
 	if (!IS_PAGE_ALIGNED(pa) || !IS_PAGE_ALIGNED(ea) ||
@@ -276,7 +358,12 @@ int __ioremap_explicit(unsigned long pa, unsigned long ea,
 		}
 	}
 	
-	if (__ioremap_com(pa, pa, ea, size, flags) != (void *) ea) {
+	ret = __ioremap_com(pa, pa, ea, size, flags);
+	if (ret == NULL) {
+		printk(KERN_ERR "ioremap_explicit() allocation failure !\n");
+		return 1;
+	}
+	if (ret != (void *) ea) {
 		printk(KERN_ERR "__ioremap_com() returned unexpected addr\n");
 		return 1;
 	}
@@ -284,69 +371,6 @@ int __ioremap_explicit(unsigned long pa, unsigned long ea,
 	return 0;
 }
 
-static void unmap_im_area_pte(pmd_t *pmd, unsigned long address,
-				  unsigned long size)
-{
-	unsigned long base, end;
-	pte_t *pte;
-
-	if (pmd_none(*pmd))
-		return;
-	if (pmd_bad(*pmd)) {
-		pmd_ERROR(*pmd);
-		pmd_clear(pmd);
-		return;
-	}
-
-	pte = pte_offset_kernel(pmd, address);
-	base = address & PMD_MASK;
-	address &= ~PMD_MASK;
-	end = address + size;
-	if (end > PMD_SIZE)
-		end = PMD_SIZE;
-
-	do {
-		pte_t page;
-		page = ptep_get_and_clear(&ioremap_mm, base + address, pte);
-		address += PAGE_SIZE;
-		pte++;
-		if (pte_none(page))
-			continue;
-		if (pte_present(page))
-			continue;
-		printk(KERN_CRIT "Whee.. Swapped out page in kernel page"
-		       " table\n");
-	} while (address < end);
-}
-
-static void unmap_im_area_pmd(pgd_t *dir, unsigned long address,
-				  unsigned long size)
-{
-	unsigned long base, end;
-	pmd_t *pmd;
-
-	if (pgd_none(*dir))
-		return;
-	if (pgd_bad(*dir)) {
-		pgd_ERROR(*dir);
-		pgd_clear(dir);
-		return;
-	}
-
-	pmd = pmd_offset(dir, address);
-	base = address & PGDIR_MASK;
-	address &= ~PGDIR_MASK;
-	end = address + size;
-	if (end > PGDIR_SIZE)
-		end = PGDIR_SIZE;
-
-	do {
-		unmap_im_area_pte(pmd, base + address, end - address);
-		address = (address + PMD_SIZE) & PMD_MASK;
-		pmd++;
-	} while (address < end);
-}
-
 /*  
  * Unmap an IO region and remove it from imalloc'd list.
  * Access to IO memory should be serialized by driver.
@@ -356,39 +380,19 @@ static void unmap_im_area_pmd(pgd_t *dir, unsigned long address,
  */
 void iounmap(volatile void __iomem *token)
 {
-	unsigned long address, start, end, size;
-	struct mm_struct *mm;
-	pgd_t *dir;
+	unsigned long address, size;
 	void *addr;
 
-	if (!mem_init_done) {
+	if (!mem_init_done)
 		return;
-	}
 	
 	addr = (void *) ((unsigned long __force) token & PAGE_MASK);
 	
-	if ((size = im_free(addr)) == 0) {
+	if ((size = im_free(addr)) == 0)
 		return;
-	}
 
 	address = (unsigned long)addr; 
-	start = address;
-	end = address + size;
-
-	mm = &ioremap_mm;
-	spin_lock(&mm->page_table_lock);
-
-	dir = pgd_offset_i(address);
-	flush_cache_vunmap(address, end);
-	do {
-		unmap_im_area_pmd(dir, address, end - address);
-		address = (address + PGDIR_SIZE) & PGDIR_MASK;
-		dir++;
-	} while (address && (address < end));
-	flush_tlb_kernel_range(start, end);
-
-	spin_unlock(&mm->page_table_lock);
-	return;
+	unmap_im_area(address, address + size);
 }
 
 static int iounmap_subset_regions(unsigned long addr, unsigned long size)