- 12 Apr, 2007 40 commits
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Benjamin Herrenschmidt authored
On hash table based 32 bits powerpc's, the hash management code runs with a big spinlock. It's thus important that it never causes itself a hash fault. That code is generally safe (it does memory accesses in real mode among other things) with the exception of the actual access to the code itself. That is, the kernel text needs to be accessible without taking a hash miss exceptions. This is currently guaranteed by having a BAT register mapping part of the linear mapping permanently, which includes the kernel text. But this is not true if using the "nobats" kernel command line option (which can be useful for debugging) and will not be true when using DEBUG_PAGEALLOC implemented in a subsequent patch. This patch fixes this by pre-faulting in the hash table pages that hit the kernel text, and making sure we never evict such a page under hash pressure. Signed-off-by:
Benjamin Herrenchmidt <benh@kernel.crashing.org> arch/powerpc/mm/hash_low_32.S | 22 ++++++++++++++++++++-- arch/powerpc/mm/mem.c | 3 --- arch/powerpc/mm/mmu_decl.h | 4 ++++ arch/powerpc/mm/pgtable_32.c | 11 +++++++---- 4 files changed, 31 insertions(+), 9 deletions(-) Signed-off-by:
Paul Mackerras <paulus@samba.org>
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Benjamin Herrenschmidt authored
The 32 bits map_page() function is used internally by the mm code for early mmu mappings and for ioremap. It should never be called for an address that already has a valid PTE or hash entry, so we add a BUG_ON for that and remove the useless flush_HPTE call. Signed-off-by:
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Benjamin Herrenschmidt authored
The current tlb flush code on powerpc 64 bits has a subtle race since we lost the page table lock due to the possible faulting in of new PTEs after a previous one has been removed but before the corresponding hash entry has been evicted, which can leads to all sort of fatal problems. This patch reworks the batch code completely. It doesn't use the mmu_gather stuff anymore. Instead, we use the lazy mmu hooks that were added by the paravirt code. They have the nice property that the enter/leave lazy mmu mode pair is always fully contained by the PTE lock for a given range of PTEs. Thus we can guarantee that all batches are flushed on a given CPU before it drops that lock. We also generalize batching for any PTE update that require a flush. Batching is now enabled on a CPU by arch_enter_lazy_mmu_mode() and disabled by arch_leave_lazy_mmu_mode(). The code epects that this is always contained within a PTE lock section so no preemption can happen and no PTE insertion in that range from another CPU. When batching is enabled on a CPU, every PTE updates that need a hash flush will use the batch for that flush. Signed-off-by:
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Benjamin Herrenschmidt authored
Make the alignment exception handler use the new _inatomic variants of __get/put_user. This fixes erroneous warnings in the very rare cases where we manage to have copy_tofrom_user_inatomic() trigger an alignment exception. Signed-off-by:
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Benjamin Herrenschmidt authored
Those are needed by things like alignment exception fixup handlers since those can now be triggered by copy_tofrom_user_inatomic. Signed-off-by:
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Milind Arun Choudhary authored
Unused ROUND_UP, NAME_OFFSET macro cleanup Signed-off-by:
Milind Arun Choudhary <milindchoudhary@gmail.com> Signed-off-by:
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Olaf Hering authored
The firmware assigns irq 20/21 to the VIA IDE device on Pegasos. But the required interrupt is 14/15. Maybe someone confused decimal vs. hexadecimal values. Signed-off-by:
Olaf Hering <olaf@aepfle.de> Signed-off-by:
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Stephen Rothwell authored
This also fixes a bug where a property value was being modified in place. Signed-off-by:
Stephen Rothwell <sfr@canb.auug.org.au> Acked-by:
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Stephen Rothwell authored
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Stephen Rothwell authored
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Stephen Rothwell authored
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Stephen Rothwell authored
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Paul Mackerras authored
Some drivers have resources that they want to be able to map into userspace that are 4k in size. On a kernel configured with 64k pages we currently end up mapping the 4k we want plus another 60k of physical address space, which could contain anything. This can introduce security problems, for example in the case of an infiniband adaptor where the other 60k could contain registers that some other program is using for its communications. This patch adds a new function, remap_4k_pfn, which drivers can use to map a single 4k page to userspace regardless of whether the kernel is using a 4k or a 64k page size. Like remap_pfn_range, it would typically be called in a driver's mmap function. It only maps a single 4k page, which on a 64k page kernel appears replicated 16 times throughout a 64k page. On a 4k page kernel it reduces to a call to remap_pfn_range. The way this works on a 64k kernel is that a new bit, _PAGE_4K_PFN, gets set on the linux PTE. This alters the way that __hash_page_4K computes the real address to put in the HPTE. The RPN field of the linux PTE becomes the 4k RPN directly rather than being interpreted as a 64k RPN. Since the RPN field is 32 bits, this means that physical addresses being mapped with remap_4k_pfn have to be below 2^44, i.e. 0x100000000000. The patch also factors out the code in arch/powerpc/mm/hash_utils_64.c that deals with demoting a process to use 4k pages into one function that gets called in the various different places where we need to do that. There were some discrepancies between exactly what was done in the various places, such as a call to spu_flush_all_slbs in one case but not in others. Signed-off-by: -
Stephen Rothwell authored
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Stephen Rothwell authored
This is more consistent and gets us closer to the Sparc code. Signed-off-by:
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Stephen Rothwell authored
This is more consistent and gets us closer to the Sparc code. Signed-off-by:
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Stephen Rothwell authored
This is more consistent and gets us closer to the Sparc code. We add a device_is_compatible define for compatibility during the change over. Signed-off-by:
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Stephen Rothwell authored
This is more consistent and gets us closer to the Sparc code. We add a get_property define for compatibility during the change over. Signed-off-by:
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Stephen Rothwell authored
This just tidies up some of the remains. Signed-off-by:
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Olaf Hering authored
Currently the buf pointer is advanced too far during each iteration. Also terminate the string with a newline. Signed-off-by:
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Olaf Hering authored
Efika boards have to be booted with console=ttyPSC0 unless there is a graphics card plugged in. Detect if the firmware stdout is the serial connector. Signed-off-by:
Grant Likely <grant.likely@secretlab.ca> Signed-off-by:
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Milton Miller authored
Our kernels put everything in the first load segment, and we read that. Instead of decompressing to the end of the gzip stream or supplied image and hoping we get it all, decompress the expected size and complain if it is not available. Signed-off-by:
Milton Miller <miltonm@bga.com> Signed-off-by:
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Milton Miller authored
Commit a9903811 missed two uses of the the .gz suffix in the wrapper script and didn't clean the additonal possibly cached files. Signed-off-by:
Scott Wood <scottwood@freescale.com> Signed-off-by:
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Milton Miller authored
crt0.S had provisions to provide run address relocaton to got2 and cache flush, but not on the bss clear or stack pointer load. Apply the same fixup for them. Signed-off-by:
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Mark A. Greer authored
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Mark A. Greer <mgreer@mvista.com> Signed-off-by:
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Mark A. Greer authored
The ELF parsing routines local to arch/powerpc/boot/main.c are useful to other callers therefore move them to their own file. Signed-off-by:
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Giuliano Pochini authored
72486f1f inverted the sense for enabling hotplug CPU controls without reference to any other architecture other than i386, ia64 and PowerPC. This left everyone else without hotplug CPU control. Fix powerpc for this brain damage. (akpm: patch adapted from rmk's ARM fix. Changelog stolen from rmk) Signed-off-by:
Giuliano Pochini <pochini@shiny.it> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
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Robert P. J. Day authored
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Robert P. J. Day <rpjday@mindspring.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by:
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Bart Van Assche authored
Lifted from http://bugzilla.kernel.org/show_bug.cgi?id=8182 Steps to reproduce: - Boot an Ocotea board with the mainline 2.6.20.1 kernel. - Create an /etc/ntp.conf file with at least one NTP server and iburst mode set. - Issue the command "ntpd -g". - Wait about two minutes. - Verify ntpd's status via "ntpq -pn" and by looking in /var/log/ntp. This fixes this problem by adjusting the expected clock frequency. Cc: Kumar Gala <galak@gate.crashing.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by:
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Scott Wood authored
dt_xlate_reg() uses the ranges properties of a node's parentage to find the absolute physical address of the node's registers. The ns16550 driver uses this when no virtual-reg property is found. Signed-off-by:
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Christoph Hellwig authored
There is no reason to yield the CPU in spu_yield - if the backing thread reenters spu_run it gets added to the end of the runqueue for it's priority. So the yield is just a slowdown for the case where we have higher priority contexts waiting. Signed-off-by:
Christoph Hellwig <hch@lst.de> Acked-by:
Arnd Bergmann <arnd@arndb.de> Signed-off-by:
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Geert Uytterhoeven authored
I wanted to enable CBE_THERM on PS3. So I had to enable CBE_RAS first. But the resulting kernel doesn't link, as cbe_regs.c isn't compiled for non-PPC_CELL_NATIVE. CBE_RAS should depend on PPC_CELL_NATIVE; this makes it so. Signed-off-by:
Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Acked-by:
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Sonny Rao authored
This is now inaccurate because we may not have entered prom_init() and r3 is overwritten immediately anyway. Signed-off-by:
Sonny Rao <sonny@burdell.org> Signed-off-by:
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Olaf Hering authored
Remove unneeded inclusion of linux/ide.h It does not compile with CONFIG_BLOCK=n. Remove asm/ide.h from ksyms file, it gets included earlier via linux/ide.h. Compile tested with all defconfig files. Signed-off-by:
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Tony Vroon authored
This allows the PMU LED on both a PowerMac 7,2 (Dual G5 2.0GHz, June 2003) and a PowerMac 7,3 (Dual G5 2.0GHz, June 2004) to be controlled. The physical LED is never off, unlike an iBook/PowerBook LED. It is rather dim ("off") or very bright ("on"). Signed-off-by:Tony Vroon <chainsaw@gentoo.org> Signed-off-by:
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Olaf Hering authored
Fix link errors with CONFIG_EEH=n: arch/powerpc/platforms/built-in.o: In function `.pcibios_fixup_new_pci_devices': (.text+0x41c8): undefined reference to `.eeh_add_device_tree_late' arch/powerpc/platforms/built-in.o: In function `.init_phb_dynamic': (.text+0x4280): undefined reference to `.eeh_add_device_tree_early' arch/powerpc/platforms/built-in.o: In function `.pcibios_remove_pci_devices': (.text+0x42fc): undefined reference to `.eeh_remove_bus_device' arch/powerpc/platforms/built-in.o: In function `.pcibios_add_pci_devices': (.text+0x43c0): undefined reference to `.eeh_add_device_tree_early' arch/powerpc/platforms/built-in.o: In function `.pSeries_final_fixup': (.init.text+0xb4): undefined reference to `.pci_addr_cache_build' make[1]: *** [.tmp_vmlinux1] Error 1 Signed-off-by:
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David Gibson authored
This cleans up how the zImage code manipulates the kernel command line. Notable improvements from the old handling: - Command line manipulation is consolidated into a new prep_cmdline() function, rather than being scattered across start() and some helper functions - Less stack space use: we use just a single global command line buffer, which can be initialized by an external tool as before, we no longer need another command line sized buffer on the stack. - Easier to support platforms whose firmware passes a commandline, but not a device tree. Platform code can now point new loader_info fields to the firmware's command line, rather than having to do early manipulation of the /chosen bootargs property which may then be rewritten again by the core. Signed-off-by:
David Gibson <david@gibson.dropbear.id.au> Signed-off-by:
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David Gibson authored
This patch adds a library of useful device tree manipulation functions to the zImage library, for use by platform code. These functions are based on the hooks already in dt_ops, so they're not dependent on a particular device tree implementation. This patch also slightly streamlines the code in main.c using these new functions. This is a consolidation of my work in this area with Scott Wood's patches to a very similar end. Signed-off-by:
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Olof Johansson authored
mtocrf is a faster single-field mtcrf (move to condition register fields) instruction available in POWER4 and later processors. It can make quite a difference in performance on some implementations, so use it for CONFIG_POWER4_ONLY builds. Signed-off-by:
Olof Johansson <olof@lixom.net> Signed-off-by:
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Jake Moilanen authored
There are many adapters which cannot handle DMAing across any 4 GB boundary. For instance, the latest Emulex adapters. This normally is not an issue as firmware gives dma-windows under 4gigs. However, some of the new System-P boxes have dma-windows above 4gigs, and this present a problem. During initialization of the IOMMU tables, the last entry at each 4GB boundary is marked as used. Thus no mappings can cross the boundary. If a table ends at a 4GB boundary, the entry is not marked as used. A boot option to remove this 4GB protection is given w/ protect4gb=off. This exposes the potential issue for driver and hardware development purposes. Signed-off-by:
Jake Moilanen <moilanen@austin.ibm.com> Acked-by:
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