[POWERPC] Rewrite IO allocation & mapping on powerpc64

This rewrites pretty much from scratch the handling of MMIO and PIO
space allocations on powerpc64.  The main goals are:

 - Get rid of imalloc and use more common code where possible
 - Simplify the current mess so that PIO space is allocated and
   mapped in a single place for PCI bridges
 - Handle allocation constraints of PIO for all bridges including
   hot plugged ones within the 2GB space reserved for IO ports,
   so that devices on hotplugged busses will now work with drivers
   that assume IO ports fit in an int.
 - Cleanup and separate tracking of the ISA space in the reserved
   low 64K of IO space. No ISA -> Nothing mapped there.

I booted a cell blade with IDE on PIO and MMIO and a dual G5 so
far, that's it :-)

With this patch, all allocations are done using the code in
mm/vmalloc.c, though we use the low level __get_vm_area with
explicit start/stop constraints in order to manage separate
areas for vmalloc/vmap, ioremap, and PCI IOs.

This greatly simplifies a lot of things, as you can see in the
diffstat of that patch :-)

A new pair of functions pcibios_map/unmap_io_space() now replace
all of the previous code that used to manipulate PCI IOs space.
The allocation is done at mapping time, which is now called from
scan_phb's, just before the devices are probed (instead of after,
which is by itself a bug fix). The only other caller is the PCI
hotplug code for hot adding PCI-PCI bridges (slots).

imalloc is gone, as is the "sub-allocation" thing, but I do beleive
that hotplug should still work in the sense that the space allocation
is always done by the PHB, but if you unmap a child bus of this PHB
(which seems to be possible), then the code should properly tear
down all the HPTE mappings for that area of the PHB allocated IO space.

I now always reserve the first 64K of IO space for the bridge with
the ISA bus on it. I have moved the code for tracking ISA in a separate
file which should also make it smarter if we ever are capable of
hot unplugging or re-plugging an ISA bridge.

This should have a side effect on platforms like powermac where VGA IOs
will no longer work. This is done on purpose though as they would have
worked semi-randomly before. The idea at this point is to isolate drivers
that might need to access those and fix them by providing a proper
function to obtain an offset to the legacy IOs of a given bus.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 8 insertions, 11 deletions

diff --git a/include/asm-powerpc/io.h b/include/asm-powerpc/io.h
index 350c9bdb31d..17efea5b594 100644
--- a/include/asm-powerpc/io.h
+++ b/include/asm-powerpc/io.h
@@ -607,9 +607,9 @@ static inline void iosync(void)
  *
  * * iounmap undoes such a mapping and can be hooked
  *
- * * __ioremap_explicit (and the pending __iounmap_explicit) are low level
- *   functions to create hand-made mappings for use only by the PCI code
- *   and cannot currently be hooked.
+ * * __ioremap_at (and the pending __iounmap_at) are low level functions to
+ *   create hand-made mappings for use only by the PCI code and cannot
+ *   currently be hooked. Must be page aligned.
  *
  * * __ioremap is the low level implementation used by ioremap and
  *   ioremap_flags and cannot be hooked (but can be used by a hook on one
@@ -629,12 +629,9 @@ extern void __iomem *__ioremap(phys_addr_t, unsigned long size,
 			       unsigned long flags);
 extern void __iounmap(volatile void __iomem *addr);
 
-extern int __ioremap_explicit(phys_addr_t p_addr, unsigned long v_addr,
-		     	      unsigned long size, unsigned long flags);
-extern int __iounmap_explicit(volatile void __iomem *start,
-			      unsigned long size);
-
-extern void __iomem * reserve_phb_iospace(unsigned long size);
+extern void __iomem * __ioremap_at(phys_addr_t pa, void *ea,
+				   unsigned long size, unsigned long flags);
+extern void __iounmap_at(void *ea, unsigned long size);
 
 /* Those are more 32 bits only functions */
 extern unsigned long iopa(unsigned long addr);
@@ -651,8 +648,8 @@ extern void io_block_mapping(unsigned long virt, phys_addr_t phys,
  */
 #define HAVE_ARCH_PIO_SIZE		1
 #define PIO_OFFSET			0x00000000UL
-#define PIO_MASK			0x3fffffffUL
-#define PIO_RESERVED			0x40000000UL
+#define PIO_MASK			(FULL_IO_SIZE - 1)
+#define PIO_RESERVED			(FULL_IO_SIZE)
 
 #define mmio_read16be(addr)		readw_be(addr)
 #define mmio_read32be(addr)		readl_be(addr)