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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2007-06-04 15:15:36 +1000
committerPaul Mackerras <paulus@samba.org>2007-06-14 22:29:56 +1000
commit3d5134ee8341bffc4f539049abb9e90d469b448d (patch)
tree037958e0daa97b4ef350908a53182167ee2c8a03 /include/asm-powerpc/pgtable-ppc64.h
parentc19c03fc749147f565e807fa65f1729066800571 (diff)
[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>
Diffstat (limited to 'include/asm-powerpc/pgtable-ppc64.h')
-rw-r--r--include/asm-powerpc/pgtable-ppc64.h21
1 files changed, 15 insertions, 6 deletions
diff --git a/include/asm-powerpc/pgtable-ppc64.h b/include/asm-powerpc/pgtable-ppc64.h
index 704c4e669fe0..9b0f51ccad05 100644
--- a/include/asm-powerpc/pgtable-ppc64.h
+++ b/include/asm-powerpc/pgtable-ppc64.h
@@ -27,7 +27,7 @@ struct mm_struct;
*/
#define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT)
-#define PGTABLE_RANGE (1UL << PGTABLE_EADDR_SIZE)
+#define PGTABLE_RANGE (ASM_CONST(1) << PGTABLE_EADDR_SIZE)
#if TASK_SIZE_USER64 > PGTABLE_RANGE
#error TASK_SIZE_USER64 exceeds pagetable range
@@ -37,19 +37,28 @@ struct mm_struct;
#error TASK_SIZE_USER64 exceeds user VSID range
#endif
+
/*
* Define the address range of the vmalloc VM area.
*/
#define VMALLOC_START ASM_CONST(0xD000000000000000)
-#define VMALLOC_SIZE ASM_CONST(0x80000000000)
+#define VMALLOC_SIZE (PGTABLE_RANGE >> 1)
#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
/*
- * Define the address range of the imalloc VM area.
+ * Define the address ranges for MMIO and IO space :
+ *
+ * ISA_IO_BASE = VMALLOC_END, 64K reserved area
+ * PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces
+ * IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE
*/
-#define PHBS_IO_BASE VMALLOC_END
-#define IMALLOC_BASE (PHBS_IO_BASE + 0x80000000ul) /* Reserve 2 gigs for PHBs */
-#define IMALLOC_END (VMALLOC_START + PGTABLE_RANGE)
+#define FULL_IO_SIZE 0x80000000ul
+#define ISA_IO_BASE (VMALLOC_END)
+#define ISA_IO_END (VMALLOC_END + 0x10000ul)
+#define PHB_IO_BASE (ISA_IO_END)
+#define PHB_IO_END (VMALLOC_END + FULL_IO_SIZE)
+#define IOREMAP_BASE (PHB_IO_END)
+#define IOREMAP_END (VMALLOC_START + PGTABLE_RANGE)
/*
* Region IDs