- Apr 24, 2007
-
-
Luke Browning authored
Addition to stop_wq needs to happen before adding to the runqeueue and under the same lock so that we don't have a race window for a lost wake up in the spu scheduler. Signed-off-by:
Luke Browning <lukebrowning@us.ibm.com> Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Arnd Bergmann <arnd.bergmann@de.ibm.com>
-
Christoph Hellwig authored
For quite a while now spu state is protected by a simple mutex instead of the old rw_semaphore, and this means we can simplify the locking around spu_setup_isolated a lot. Instead of doing an spu_release before entering spu_setup_isolated and then calling the complicated spu_acquire_exclusive we can now simply enter the function locked an in guaranteed runnable state, so that the only bit of spu_acquire_exclusive that's left is the call to spu_unmap_mappings. Similarly there's no more need to unlock and reacquire the state_mutex when spu_setup_isolated is done, but we can always return with the lock held and only drop it in spu_run_init in the failure case. Signed-off-by:
-
Christoph Hellwig authored
A single context should only be woken once, and we should not have more wakeups for a given priority than the number of contexts on that runqueue position. Also add some asserts to trap future problems in this area more easily. Signed-off-by:
-
Arnd Bergmann authored
set_bit does not guarantee ordering on powerpc, so using it for communication between threads requires explicit mb() calls. Signed-off-by: -
Christoph Hellwig authored
To not lose a spu thread we need to make sure it always gets put back on the runqueue. In find_victim aswell as in the scheduler tick as done in the previous patch. Signed-off-by:
-
Christoph Hellwig authored
To not lose a spu thread we need to make sure it always gets put back on the runqueue. Signed-off-by:
Jeremy Kerr <jk@ozlabs.org> Signed-off-by:
-
Christoph Hellwig authored
Make sure the pointers to various mappings are cleared once the last user stopped using them. This avoids accessing freed memory when tearing down the gang directory aswell as optimizing away pte invalidations if no one uses these. Signed-off-by:
-
Christoph Hellwig authored
The scheduler workqueue may rearm itself and deadlock when we try to stop it. Put a flag in place to avoid skip the work if we're tearing down the context. Signed-off-by:
-
- Apr 13, 2007
-
-
Paul Mackerras authored
Commit 79c85419 introduced code to move the initrd if it was in a place where it would get overwritten by the kernel image. Unfortunately this exposed the fact that the code that checks whether the values passed in r3 and r4 are intended to indicate the start address and size of an initrd image was not as thorough as the kernel's checks. The symptom is that on OF-based platforms, the bootwrapper can cause an exception which causes the system to drop back into OF. Previously it didn't matter so much if the code incorrectly thought that there was an initrd, since the values for start and size were just passed through to the kernel. Now the bootwrapper needs to apply the same checks as the kernel since it is now using the initrd data itself (in the process of copying it if necessary). This adds the code to do that. Signed-off-by:
Paul Mackerras <paulus@samba.org>
-
Joachim Fenkes authored
In some cases, multiple OFDT nodes might share the same location code, so the location code is not a unique identifier for an OFDT node. Changed the ibmebus probe/remove interface to use the DT path of the device node instead of the location code. The DT path must be written into probe/remove right as it would appear in the "devspec" attribute of the ebus device: relative to the DT root, with a leading slash and without a trailing slash. One trailing newline will not hurt; multiple newlines will (like perl's chomp()). Example: Add a device "/proc/device-tree/foo@12345678" to ibmebus like this: echo /foo@12345678 > /sys/bus/ibmebus/probe Remove the device like this: echo /foo@12345678 > /sys/bus/ibmebus/remove Signed-off-by:Joachim Fenkes <fenkes@de.ibm.com> Signed-off-by:
-
Benjamin Herrenschmidt authored
Here's an implementation of DEBUG_PAGEALLOC for 64 bits powerpc. It applies on top of the 32 bits patch. Unlike Anton's previous attempt, I'm not using updatepp. I'm removing the hash entries from the bolted mapping (using a map in RAM of all the slots). Expensive but it doesn't really matter, does it ? :-) Memory hot-added doesn't benefit from this unless it's added at an address that is below end_of_DRAM() as calculated at boot time. Signed-off-by:
Benjamin Herrenschmidt <benh@kernel.crashing.org> arch/powerpc/Kconfig.debug | 2 arch/powerpc/mm/hash_utils_64.c | 84 ++++++++++++++++++++++++++++++++++++++-- 2 files changed, 82 insertions(+), 4 deletions(-) Signed-off-by:
-
Benjamin Herrenschmidt authored
Here's an implementation of DEBUG_PAGEALLOC for ppc32. It disables BAT mapping and is only tested with Hash table based processor though it shouldn't be too hard to adapt it to others. Signed-off-by:
-
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 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:
-
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:
-
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:
-
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:
-
Milind Arun Choudhary authored
Unused ROUND_UP, NAME_OFFSET macro cleanup Signed-off-by:
Milind Arun Choudhary <milindchoudhary@gmail.com> Signed-off-by:
-
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:
-
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:
-
Stephen Rothwell authored
Signed-off-by:
-
Stephen Rothwell authored
Signed-off-by:
-
Stephen Rothwell authored
Signed-off-by:
-
Stephen Rothwell authored
Signed-off-by:
-
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
Signed-off-by:
-
Stephen Rothwell authored
This is more consistent and gets us closer to the Sparc code. Signed-off-by:
-
Stephen Rothwell authored
This is more consistent and gets us closer to the Sparc code. Signed-off-by:
-
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:
-
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:
-
Stephen Rothwell authored
This just tidies up some of the remains. Signed-off-by:
-
Olaf Hering authored
Currently the buf pointer is advanced too far during each iteration. Also terminate the string with a newline. Signed-off-by:
-
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:
-
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:
-
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:
-
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:
-
Mark A. Greer authored
Signed-off-by:
Mark A. Greer <mgreer@mvista.com> Signed-off-by:
-
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:
-
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:
-
Robert P. J. Day authored
Signed-off-by:
Robert P. J. Day <rpjday@mindspring.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by:
-
