- 23 Apr, 2007 16 commits
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Christoph Hellwig authored
We now have proper locking around assignets of the mapping pointers, and the spin_unlock implies enough of a barrier to get rid of the explicit one. Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Arnd Bergmann <arnd.bergmann@de.ibm.com>
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Akinobu Mita authored
When SPU isolation mode enabled, isolated_loader would be allocated by spufs_init_isolated_loader() on module_init(). But anyone do not free it. This patch introduces spufs_exit_isolated_loader() which is the opposite of spufs_init_isolated_loader() and called on module_exit(). Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by:
Akinobu Mita <mita@fixstars.com> Signed-off-by:
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Akinobu Mita authored
spufs module_init forgot to call a few cleanup functions on error path. This patch also includes cosmetic changes in spu_sched_init() (identation fix and return error code). [modified by hch to apply ontop of the latest schedule changes] Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by:
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Akinobu Mita authored
This patch checks return value of spu_acquire_runnable() in spufs_mfc_write(). Signed-off-by:
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Christoph Hellwig authored
There is no reason for run_sema to be a struct semaphore. Changing it to a mutex and rename it accordingly. Signed-off-by:
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Jeremy Kerr authored
This change populates a siginfo struct for SPE application exceptions (ie, invalid DMAs and illegal instructions). Tested on an IBM Cell Blade. Signed-off-by:
Jeremy Kerr <jk@ozlabs.org> Signed-off-by:
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Arnd Bergmann authored
Until now, we have always entered the spu page fault handler with a mutex for the spu context held. This has multiple bad side-effects: - it becomes impossible to suspend the context during page faults - if an spu program attempts to access its own mmio areas through DMA, we get an immediate livelock when the nopage function tries to acquire the same mutex This patch makes the page fault logic operate on a struct spu_context instead of a struct spu, and moves it from spu_base.c to a new file fault.c inside of spufs. We now also need to copy the dar and dsisr contents of the last fault into the saved context to have it accessible in case we schedule out the context before activating the page fault handler. Signed-off-by: -
Christoph Hellwig authored
There is no reason to execute spu_init_channels under spu_mutex after the spu has been taken off the freelist it's ours. Signed-off-by:
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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:
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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:
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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:
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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:
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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:
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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:
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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:
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- 13 Apr, 2007 1 commit
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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>
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- 12 Apr, 2007 23 commits
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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:
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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:
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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:
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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:
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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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