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Subject[PATCH v2 04/14] powerpc: common ioremap functions.
Date
__ioremap(), ioremap(), ioremap_wc() et ioremap_prot() are
very similar between PPC32 and PPC64, they can easily be
made common.

_PAGE_WRITE equals to _PAGE_RW on PPC32
_PAGE_RO and _PAGE_HWWRITE are 0 on PPC64

iounmap() can also be made common by renaming the PPC32
iounmap() as __iounmap() then __iounmap() can also
be made common to PPC32 and PPC64.

This patch also makes __ioremap_caller() common to PPC32 and PPC64

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/include/asm/book3s/64/pgtable.h | 2 +
arch/powerpc/include/asm/machdep.h | 2 +-
arch/powerpc/mm/ioremap.c | 190 ++++++---------------------
3 files changed, 46 insertions(+), 148 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 47b5ffc8715d..2bebdd8302cb 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -17,6 +17,8 @@
#define _PAGE_NA 0
#define _PAGE_RO 0
#define _PAGE_USER 0
+#define _PAGE_HWWRITE 0
+#define _PAGE_COHERENT 0

#define _PAGE_EXEC 0x00001 /* execute permission */
#define _PAGE_WRITE 0x00002 /* write access allowed */
diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h
index ffe7c71e1132..84d99ed82d5d 100644
--- a/arch/powerpc/include/asm/machdep.h
+++ b/arch/powerpc/include/asm/machdep.h
@@ -33,11 +33,11 @@ struct pci_host_bridge;

struct machdep_calls {
char *name;
-#ifdef CONFIG_PPC64
void __iomem * (*ioremap)(phys_addr_t addr, unsigned long size,
unsigned long flags, void *caller);
void (*iounmap)(volatile void __iomem *token);

+#ifdef CONFIG_PPC64
#ifdef CONFIG_PM
void (*iommu_save)(void);
void (*iommu_restore)(void);
diff --git a/arch/powerpc/mm/ioremap.c b/arch/powerpc/mm/ioremap.c
index a498e3cade9e..a140feec2f8a 100644
--- a/arch/powerpc/mm/ioremap.c
+++ b/arch/powerpc/mm/ioremap.c
@@ -35,147 +35,6 @@ unsigned long ioremap_bot = IOREMAP_BASE;
#endif
EXPORT_SYMBOL(ioremap_bot); /* aka VMALLOC_END */

-#ifdef CONFIG_PPC32
-
-void __iomem *
-ioremap(phys_addr_t addr, unsigned long size)
-{
- return __ioremap_caller(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED,
- __builtin_return_address(0));
-}
-EXPORT_SYMBOL(ioremap);
-
-void __iomem *
-ioremap_wc(phys_addr_t addr, unsigned long size)
-{
- return __ioremap_caller(addr, size, _PAGE_NO_CACHE,
- __builtin_return_address(0));
-}
-EXPORT_SYMBOL(ioremap_wc);
-
-void __iomem *
-ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags)
-{
- /* writeable implies dirty for kernel addresses */
- if ((flags & (_PAGE_RW | _PAGE_RO)) != _PAGE_RO)
- flags |= _PAGE_DIRTY | _PAGE_HWWRITE;
-
- /* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
- flags &= ~(_PAGE_USER | _PAGE_EXEC);
- flags |= _PAGE_PRIVILEGED;
-
- return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
-}
-EXPORT_SYMBOL(ioremap_prot);
-
-void __iomem *
-__ioremap(phys_addr_t addr, unsigned long size, unsigned long flags)
-{
- return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
-}
-EXPORT_SYMBOL(__ioremap);
-
-void __iomem *
-__ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags,
- void *caller)
-{
- unsigned long v, i;
- phys_addr_t p;
- int err;
-
- /* Make sure we have the base flags */
- if ((flags & _PAGE_PRESENT) == 0)
- flags |= pgprot_val(PAGE_KERNEL);
-
- /* Non-cacheable page cannot be coherent */
- if (flags & _PAGE_NO_CACHE)
- flags &= ~_PAGE_COHERENT;
-
- /*
- * Choose an address to map it to.
- * Once the vmalloc system is running, we use it.
- * Before then, we use space going up from IOREMAP_BASE
- * (ioremap_bot records where we're up to).
- */
- p = addr & PAGE_MASK;
- size = PAGE_ALIGN(addr + size) - p;
-
- /*
- * If the address lies within the first 16 MB, assume it's in ISA
- * memory space
- */
- if (p < 16*1024*1024)
- p += _ISA_MEM_BASE;
-
-#ifndef CONFIG_CRASH_DUMP
- /*
- * Don't allow anybody to remap normal RAM that we're using.
- * mem_init() sets high_memory so only do the check after that.
- */
- if (slab_is_available() && (p < virt_to_phys(high_memory)) &&
- page_is_ram(__phys_to_pfn(p))) {
- printk("__ioremap(): phys addr 0x%llx is RAM lr %ps\n",
- (unsigned long long)p, __builtin_return_address(0));
- return NULL;
- }
-#endif
-
- if (size == 0)
- return NULL;
-
- /*
- * Is it already mapped? Perhaps overlapped by a previous
- * mapping.
- */
- v = p_block_mapped(p);
- if (v)
- goto out;
-
- if (slab_is_available()) {
- struct vm_struct *area;
- area = get_vm_area_caller(size, VM_IOREMAP, caller);
- if (area == 0)
- return NULL;
- area->phys_addr = p;
- v = (unsigned long) area->addr;
- } else {
- v = ioremap_bot;
- ioremap_bot += size;
- }
-
- /*
- * Should check if it is a candidate for a BAT mapping
- */
-
- err = 0;
- for (i = 0; i < size && err == 0; i += PAGE_SIZE)
- err = map_kernel_page(v+i, p+i, flags);
- if (err) {
- if (slab_is_available())
- vunmap((void *)v);
- return NULL;
- }
-
-out:
- return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK));
-}
-
-void iounmap(volatile void __iomem *addr)
-{
- /*
- * If mapped by BATs then there is nothing to do.
- * Calling vfree() generates a benign warning.
- */
- if (v_block_mapped((unsigned long)addr))
- return;
-
- if ((unsigned long) addr >= ioremap_bot)
- vunmap((void *) (PAGE_MASK & (unsigned long)addr));
-}
-EXPORT_SYMBOL(iounmap);
-
-#else
-
/**
* __ioremap_at - Low level function to establish the page tables
* for an IO mapping
@@ -189,6 +48,10 @@ void __iomem * __ioremap_at(phys_addr_t pa, void *ea, unsigned long size,
if ((flags & _PAGE_PRESENT) == 0)
flags |= pgprot_val(PAGE_KERNEL);

+ /* Non-cacheable page cannot be coherent */
+ if (flags & _PAGE_NO_CACHE)
+ flags &= ~_PAGE_COHERENT;
+
/* We don't support the 4K PFN hack with ioremap */
if (flags & H_PAGE_4K_PFN)
return NULL;
@@ -241,6 +104,33 @@ void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size,
if ((size == 0) || (paligned == 0))
return NULL;

+ /*
+ * If the address lies within the first 16 MB, assume it's in ISA
+ * memory space
+ */
+ if (IS_ENABLED(CONFIG_PPC32) && paligned < 16*1024*1024)
+ paligned += _ISA_MEM_BASE;
+
+ /*
+ * Don't allow anybody to remap normal RAM that we're using.
+ * mem_init() sets high_memory so only do the check after that.
+ */
+ if (!IS_ENABLED(CONFIG_CRASH_DUMP) &&
+ slab_is_available() && (paligned < virt_to_phys(high_memory)) &&
+ page_is_ram(__phys_to_pfn(paligned))) {
+ printk("__ioremap(): phys addr 0x%llx is RAM lr %ps\n",
+ (u64)paligned, __builtin_return_address(0));
+ return NULL;
+ }
+
+ /*
+ * Is it already mapped? Perhaps overlapped by a previous
+ * mapping.
+ */
+ ret = (void __iomem *)p_block_mapped(paligned);
+ if (ret)
+ goto out;
+
if (slab_is_available()) {
struct vm_struct *area;

@@ -259,9 +149,9 @@ void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size,
if (ret)
ioremap_bot += size;
}
-
+out:
if (ret)
- ret += addr & ~PAGE_MASK;
+ ret += (unsigned long)addr & ~PAGE_MASK;
return ret;
}

@@ -300,8 +190,8 @@ void __iomem * ioremap_prot(phys_addr_t addr, unsigned long size,
void *caller = __builtin_return_address(0);

/* writeable implies dirty for kernel addresses */
- if (flags & _PAGE_WRITE)
- flags |= _PAGE_DIRTY;
+ if ((flags & (_PAGE_WRITE | _PAGE_RO)) != _PAGE_RO)
+ flags |= _PAGE_DIRTY | _PAGE_HWWRITE;

/* we don't want to let _PAGE_EXEC leak out */
flags &= ~_PAGE_EXEC;
@@ -330,6 +220,14 @@ void __iounmap(volatile void __iomem *token)

addr = (void *) ((unsigned long __force)
PCI_FIX_ADDR(token) & PAGE_MASK);
+
+ /*
+ * If mapped by BATs then there is nothing to do.
+ * Calling vfree() generates a benign warning.
+ */
+ if (v_block_mapped((unsigned long)addr))
+ return;
+
if ((unsigned long)addr < ioremap_bot) {
printk(KERN_WARNING "Attempt to iounmap early bolted mapping"
" at 0x%p\n", addr);
@@ -347,5 +245,3 @@ void iounmap(volatile void __iomem *token)
__iounmap(token);
}
EXPORT_SYMBOL(iounmap);
-
-#endif
--
2.13.3
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