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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2007-06-04 01:15:36 -0400
committerPaul Mackerras <paulus@samba.org>2007-06-14 08:29:56 -0400
commit3d5134ee8341bffc4f539049abb9e90d469b448d (patch)
tree037958e0daa97b4ef350908a53182167ee2c8a03 /arch/powerpc/platforms/pseries
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 'arch/powerpc/platforms/pseries')
-rw-r--r--arch/powerpc/platforms/pseries/pci_dlpar.c2
-rw-r--r--arch/powerpc/platforms/pseries/pseries.h2
2 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/pseries/pci_dlpar.c b/arch/powerpc/platforms/pseries/pci_dlpar.c
index 0b113ab90ba9..47f0e0857f0e 100644
--- a/arch/powerpc/platforms/pseries/pci_dlpar.c
+++ b/arch/powerpc/platforms/pseries/pci_dlpar.c
@@ -202,8 +202,6 @@ struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
202 rtas_setup_phb(phb); 202 rtas_setup_phb(phb);
203 pci_process_bridge_OF_ranges(phb, dn, 0); 203 pci_process_bridge_OF_ranges(phb, dn, 0);
204 204
205 pci_setup_phb_io_dynamic(phb, primary);
206
207 pci_devs_phb_init_dynamic(phb); 205 pci_devs_phb_init_dynamic(phb);
208 206
209 if (dn->child) 207 if (dn->child)
diff --git a/arch/powerpc/platforms/pseries/pseries.h b/arch/powerpc/platforms/pseries/pseries.h
index 2729d559fd91..61e19f78b923 100644
--- a/arch/powerpc/platforms/pseries/pseries.h
+++ b/arch/powerpc/platforms/pseries/pseries.h
@@ -33,6 +33,8 @@ static inline void setup_kexec_cpu_down_xics(void) { }
33static inline void setup_kexec_cpu_down_mpic(void) { } 33static inline void setup_kexec_cpu_down_mpic(void) { }
34#endif 34#endif
35 35
36extern void pSeries_final_fixup(void);
37
36/* Poweron flag used for enabling auto ups restart */ 38/* Poweron flag used for enabling auto ups restart */
37extern unsigned long rtas_poweron_auto; 39extern unsigned long rtas_poweron_auto;
38 40