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2011-04-27powerpc/pci: Make IO workarounds init implicit when first bus is registeredMichael Ellerman4-28/+20
Signed-off-by: Benjamin Herrenschmidt <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-27powerpc/pci: Move IO workarounds to the common kernel dirMichael Ellerman11-12/+15
Signed-off-by: Benjamin Herrenschmidt <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-27powerpc/pci: Split IO vs MMIO indirect access hooksMichael Ellerman4-9/+23
The goal is to avoid adding overhead to MMIO when only PIO is needed Signed-off-by: Benjamin Herrenschmidt <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-27cxgb4: use pgprot_writecombine() on powerpcNishanth Aravamudan1-4/+1
Commit fe3cc0d99de6a9bf99b6c279a8afb5833888c1f7 ("powerpc: Add pgprot_writecombine") in benh's tree exposes the pgprot_writecombine() API to drivers on powerpc. cxgb4 has an open-coded version of the same, so use the common API now that it's available. Signed-off-by: Nishanth Aravamudan <[email protected]> Cc: Steve Wise <[email protected]> Cc: Anton Blanchard <[email protected]> Acked-by: Steve Wise <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-27powerpc: Per process DSCR + some fixes (try#4)Alexey Kardashevskiy8-0/+106
The DSCR (aka Data Stream Control Register) is supported on some server PowerPC chips and allow some control over the prefetch of data streams. This patch allows the value to be specified per thread by emulating the corresponding mfspr and mtspr instructions. Children of such threads inherit the value. Other threads use a default value that can be specified in sysfs - /sys/devices/system/cpu/dscr_default. If a thread starts with non default value in the sysfs entry, all children threads inherit this non default value even if the sysfs value is changed later. Signed-off-by: Alexey Kardashevskiy <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-27powerpc/book3e: Flush IPROT protected TLB entries leftover by firmwareJack Miller2-1/+45
When we set up the TLB for ourselves on Book3E, we need to flush out any old mappings established by the firmware or bootloader. At present we attempt this with a tlbilx to flush everything, but this will leave behind any entries with the IPROT bit set. There are several good reason firmware might establish mappings with IPROT, and in fact ePAPR compliant firmwares are required to establish their initial mapped area with IPROT. This patch, therefore adds more complex code to scan through the TLB upon entry and flush away any entries that are not our own. Signed-off-by: Jack Miller <[email protected]> Signed-off-by: David Gibson <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-27powerpc/book3e: Use way 3 for linear mapping bolted entryBenjamin Herrenschmidt1-2/+3
An erratum on A2 can lead to the bolted entry we insert for the linear mapping being evicted, to avoid that write the bolted entry to way 3. Signed-off-by: Benjamin Herrenschmidt <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-27powerpc: Index crit/dbg/mcheck stacks using cpu number on 64bitMichael Ellerman1-11/+15
In exc_lvl_ctx_init() we index into the crit/dbg/mcheck stacks using the hard cpu id, but that assumes the hard cpu id is zero based and contiguous. That is not the case on A2. The root of the problem is that the 32bit code has no equivalent of the paca to allow it to do the hard->soft mapping in assembler. Until the 32bit code is updated to handle that, index the stacks using the soft cpu ids on 64bit and hard on 32 bit. Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-27powerpc: Add TLB size detection for TYPE_3E MMUsBenjamin Herrenschmidt2-1/+26
Signed-off-by: Benjamin Herrenschmidt <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-27powerpc: Add A2 cpu supportBenjamin Herrenschmidt6-4/+304
Add the cputable entry, regs and setup & restore entries for the PowerPC A2 core. Signed-off-by: Benjamin Herrenschmidt <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc/nvram: Search for nvram using compatibleBenjamin Herrenschmidt1-0/+2
As well as searching for nodes with type = "nvram", search for nodes that have compatible = "nvram". This can't be converted into a single call to of_find_compatible_node() with a non-NULL type, because that searches for a node that has _both_ type & compatible = "nvram". Signed-off-by: Benjamin Herrenschmidt <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc/xics: Move irq_host matching into the ics backendMichael Ellerman3-5/+19
An upcoming new ics backend will need to implement different matching semantics to the current ones, which are essentially the RTAS ics backends. So move the current match into the RTAS backend, and allow other ics backends to override. Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc: Add SCOM infrastructureBenjamin Herrenschmidt4-0/+357
SCOM is a side-band configuration bus implemented on some processors. This code provides a way for code to map and operate on devices via SCOM, while the details of how that is implemented is left up to a SCOM "controller" in the platform code. Signed-off-by: Benjamin Herrenschmidt <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc/xics: xics.h relies on linux/interrupt.hMichael Ellerman1-0/+2
Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20of: Export of_irq_find_parent()Michael Ellerman2-1/+2
We have platform code that needs to find a node's interrupt parent, so export of_irq_find_parent() so we can use it. Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc/a2: Add some #defines for A2 specific instructionsBenjamin Herrenschmidt1-0/+25
Signed-off-by: Benjamin Herrenschmidt <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc: Replace open coded instruction patching with ↵Anton Blanchard2-20/+30
patch_instruction/patch_branch There are a few places we patch instructions without using patch_instruction and patch_branch, probably because they predated it. Fix it. Signed-off-by: Anton Blanchard <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc/nohash: Allocate stale_map[cpu] on CPU_UP_PREPARE not CPU_ONLINEMichael Ellerman1-2/+4
Currently we allocate the stale_map for a cpu when it comes online, this leaves open a small window where a process can be scheduled on the cpu before the stale_map is allocated. Instead allocate the stale_map at CPU_UP_PREPARE time, that way it will be always available before tasks start running. It is possible the cpu fails to come up, in which case we should free the stale_map, so add a CPU_UP_CANCELED case to do that. Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc/smp: smp_ops->kick_cpu() should be able to failMichael Ellerman12-23/+46
When we start a cpu we use smp_ops->kick_cpu(), which currently returns void, it should be able to fail. Convert it to return int, and update all uses. Convert all the current error cases to return -ENOENT, which is what would eventually be returned by __cpu_up() currently when it doesn't detect the cpu as coming up in time. Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc/boot: Add an ePAPR compliant boot wrapperDavid Gibson4-1/+79
This is a first cut at making bootwrapper code which will produce a zImage compliant with the requirements set down by ePAPR. This is a very simple bootwrapper, taking the device tree blob supplied by the ePAPR boot program and passing it on to the kernel. It builds on the earlier patch to build a relocatable ET_DYN zImage to meet the other ePAPR image requirements. For good measure we have some paranoid checks which will generate warnings if some of the ePAPR entry condition guarantees are not met. Signed-off-by: David Gibson <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc/boot: Allow building the zImage wrapper as a relocatable ET_DYNMichael Ellerman4-70/+118
This patch adds code, linker script and makefile support to allow building the zImage wrapper around the kernel as a position independent executable. This results in an ET_DYN instead of an ET_EXEC ELF output file, which can be loaded at any location by the firmware and will process its own relocations to work correctly at the loaded address. This is of interest particularly since the standard ePAPR image format must be an ET_DYN (although this patch alone is not sufficient to produce a fully ePAPR compliant boot image). Note for now we don't enable building with -pie for anything. Signed-off-by: Paul Mackerras <[email protected]> Signed-off-by: David Gibson <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc/mm: Fix slice state initialization for Book3EMichael Ellerman1-1/+1
On Book3E, MMU_NO_CONTEXT != 0, but the slice_mm_new_context() macro assumes that it is. This means that the map of the page sizes for each slice is always initialized to zeroes (which happens to be 4k pages), rather than to the correct default base page size value - which might be 64k. This patch corrects the problem. Signed-off-by: David Gibson <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc/mm: Standardise on MMU_NO_CONTEXTMichael Ellerman2-2/+3
Use MMU_NO_CONTEXT as the initialiser for mm_context.id on nohash and hash64. Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc: Improve prom_printf()Benjamin Herrenschmidt1-1/+25
Adds the ability to print decimal numbers and adds some more format string variants Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc: Perform an isync to synchronize CPUs coming out of secondary_holdBenjamin Herrenschmidt1-0/+2
We need to do that to guarantee they see any code change done by dynamic patching during boot. Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc: Add NAP mode support on Power7 in HV modeBenjamin Herrenschmidt7-2/+139
Wakeup comes from the system reset handler with a potential loss of the non-hypervisor CPU state. We save the non-volatile state on the stack and a pointer to it in the PACA, which the system reset handler uses to restore things Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc: Properly handshake CPUs going out of boot spin loopBenjamin Herrenschmidt5-23/+37
We need to wait a bit for them to have done their CPU setup or we might end up with translation and EE on with different LPCR values between threads Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc: Call CPU ->restore callback earlier on secondary CPUsBenjamin Herrenschmidt1-11/+11
We do it before we loop on the PACA start flag. This way, we get a chance to set critical SPRs on all CPUs before Linux tries to start them up, which avoids problems when changing some bits such as LPCR bits that need to be identical on all threads of a core or similar things like that. Ideally, some of that should also be done before the MMU is enabled, but that's a separate issue which would require moving some of the SMP startup code earlier, let's not get there for now, it works with that change alone. Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc: Initialize TLB and LPID register on HV mode Power7Benjamin Herrenschmidt1-0/+18
In case entry from the bootloader isn't "clean" Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc: Initialize LPCR:DPFD on power7 to a sane defaultBenjamin Herrenschmidt1-0/+7
This sets the default data stream prefetch size for operating systems that don't set their own value in DSCR. We use 4 which is "medium". Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc: Always use SPRN_SPRG_HSCRATCH0 when running in HV modePaul Mackerras7-28/+41
This uses feature sections to arrange that we always use HSPRG1 as the scratch register in the interrupt entry code rather than SPRG2 when we're running in hypervisor mode on POWER7. This will ensure that we don't trash the guest's SPRG2 when we are running KVM guests. To simplify the code, we define GET_SCRATCH0() and SET_SCRATCH0() macros like the GET_PACA/SET_PACA macros. Signed-off-by: Paul Mackerras <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc: More work to support HV exceptionsBenjamin Herrenschmidt3-42/+89
Rework exception macros a bit to split offset from vector and add some basic support for HDEC, HDSI, HISI and a few more. Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc: Base support for exceptions using HSRR0/1Benjamin Herrenschmidt9-49/+86
Pass the register type to the prolog, also provides alternate "HV" version of hardware interrupt (0x500) and adjust LPES accordingly We tag those interrupts by setting bit 0x2 in the trap number Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc: In HV mode, use HSPRG0 for PACABenjamin Herrenschmidt7-16/+50
When running in Hypervisor mode (arch 2.06 or later), we store the PACA in HSPRG0 instead of SPRG1. The architecture specifies that SPRGs may be lost during a "nap" power management operation (though they aren't currently on POWER7) and this enables use of SPRG1 by KVM guests. Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc: Define CPU feature for Architected 2.06 HV modeBenjamin Herrenschmidt4-1/+74
This bit indicates that we are operating in hypervisor mode on a CPU compliant to architecture 2.06 or later (currently server only). We set it on POWER7 and have a boot-time CPU setup function that clears it if MSR:HV isn't set (booting under a hypervisor). Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc/xics: Make sure we have a sensible default distribution serverBenjamin Herrenschmidt1-3/+9
Even when nothing is specified in the device tree, and despite the fact that we don't setup links properly yet, we still need a reasonable value in there or some interrupts won't be setup properly to point to an existing processor. Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc: Add more Power7 specific definitionsBenjamin Herrenschmidt2-1/+46
This adds more SPR definitions used on newer processors when running in hypervisor mode. Along with some other P7 specific bits and pieces Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-20powerpc/xics: Rewrite XICS driverBenjamin Herrenschmidt19-1017/+1377
This is a significant rework of the XICS driver, too significant to conveniently break it up into a series of smaller patches to be honest. The driver is moved to a more generic location to allow new platforms to use it, and is broken up into separate ICP and ICS "backends". For now we have the native and "hypervisor" ICP backends and one common RTAS ICS backend. The driver supports one ICP backend instanciation, and many ICS ones, in order to accomodate future platforms with multiple possibly different interrupt "sources" mechanisms. Signed-off-by: Benjamin Herrenschmidt <[email protected]>
2011-04-18Linux 2.6.39-rc4Linus Torvalds1-1/+1
2011-04-18Merge branch 'for-39-rc4' of git://codeaurora.org/quic/kernel/davidb/linux-msmLinus Torvalds2-5/+2
* 'for-39-rc4' of git://codeaurora.org/quic/kernel/davidb/linux-msm: msm: timer: fix missing return value msm: Remove extraneous ffa device check
2011-04-18Merge branch 'for-linus' of ↵Linus Torvalds8-26/+361
git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: Input: xen-kbdfront - fix mouse getting stuck after save/restore Input: estimate number of events per packet Input: evdev - indicate buffer overrun with SYN_DROPPED Input: document event types and codes and their intended use Input: add KEY_IMAGES specifically for AL Image Browser Input: twl4030_keypad - fix potential NULL dereference in twl4030_kp_probe() Input: h3600_ts - fix error handling at connect Input: twl4030_keypad - avoid potential NULL-pointer dereference
2011-04-18Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-blockLinus Torvalds18-187/+186
* 'for-linus' of git://git.kernel.dk/linux-2.6-block: block: add blk_run_queue_async block: blk_delay_queue() should use kblockd workqueue md: fix up raid1/raid10 unplugging. md: incorporate new plugging into raid5. md: provide generic support for handling unplug callbacks. md - remove old plugging code. md/dm - remove remains of plug_fn callback. md: use new plugging interface for RAID IO. block: drop queue lock before calling __blk_run_queue() for kblockd punt Revert "block: add callback function for unplug notification" block: Enhance new plugging support to support general callbacks
2011-04-18Merge branch 'merge' of ↵Linus Torvalds11-26/+81
git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: powerpc/powermac: Build fix with SMP and CPU hotplug powerpc/perf_event: Skip updating kernel counters if register value shrinks powerpc: Don't write protect kernel text with CONFIG_DYNAMIC_FTRACE enabled powerpc: Fix oops if scan_dispatch_log is called too early powerpc/pseries: Use a kmem cache for DTL buffers powerpc/kexec: Fix regression causing compile failure on UP powerpc/85xx: disable Suspend support if SMP enabled powerpc/e500mc: Remove CPU_FTR_MAYBE_CAN_NAP/CPU_FTR_MAYBE_CAN_DOZE powerpc/book3e: Fix CPU feature handling on 64-bit e5500 powerpc: Check device status before adding serial device powerpc/85xx: Don't add disabled PCIe devices
2011-04-18Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstableLinus Torvalds14-233/+430
* git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable: (24 commits) Btrfs: fix free space cache leak Btrfs: avoid taking the chunk_mutex in do_chunk_alloc Btrfs end_bio_extent_readpage should look for locked bits Btrfs: don't force chunk allocation in find_free_extent Btrfs: Check validity before setting an acl Btrfs: Fix incorrect inode nlink in btrfs_link() Btrfs: Check if btrfs_next_leaf() returns error in btrfs_real_readdir() Btrfs: Check if btrfs_next_leaf() returns error in btrfs_listxattr() Btrfs: make uncache_state unconditional btrfs: using cached extent_state in set/unlock combinations Btrfs: avoid taking the trans_mutex in btrfs_end_transaction Btrfs: fix subvolume mount by name problem when default mount subvolume is set fix user annotation in ioctl.c Btrfs: check for duplicate iov_base's when doing dio reads btrfs: properly handle overlapping areas in memmove_extent_buffer Btrfs: fix memory leaks in btrfs_new_inode() Btrfs: check for duplicate iov_base's when doing dio reads Btrfs: reuse the extent_map we found when calling btrfs_get_extent Btrfs: do not use async submit for small DIO io's Btrfs: don't split dio bios if we don't have to ...
2011-04-18proc: do proper range check on readdir offsetLinus Torvalds1-2/+7
Rather than pass in some random truncated offset to the pid-related functions, check that the offset is in range up-front. This is just cleanup, the previous commit fixed the real problem. Cc: [email protected] Signed-off-by: Linus Torvalds <[email protected]>
2011-04-18next_pidmap: fix overflow conditionLinus Torvalds2-2/+5
next_pidmap() just quietly accepted whatever 'last' pid that was passed in, which is not all that safe when one of the users is /proc. Admittedly the proc code should do some sanity checking on the range (and that will be the next commit), but that doesn't mean that the helper functions should just do that pidmap pointer arithmetic without checking the range of its arguments. So clamp 'last' to PID_MAX_LIMIT. The fact that we then do "last+1" doesn't really matter, the for-loop does check against the end of the pidmap array properly (it's only the actual pointer arithmetic overflow case we need to worry about, and going one bit beyond isn't going to overflow). [ Use PID_MAX_LIMIT rather than pid_max as per Eric Biederman ] Reported-by: Tavis Ormandy <[email protected]> Analyzed-by: Robert Święcki <[email protected]> Cc: Eric W. Biederman <[email protected]> Cc: Pavel Emelyanov <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2011-04-18Input: xen-kbdfront - fix mouse getting stuck after save/restoreIgor Mammedov1-1/+12
Mouse gets "stuck" after restore of PV guest but buttons are in working condition. If driver has been configured for ABS coordinates at start it will get XENKBD_TYPE_POS events and then suddenly after restore it'll start getting XENKBD_TYPE_MOTION events, that will be dropped later and they won't get into user-space. Regression was introduced by hunk 5 and 6 of 5ea5254aa0ad269cfbd2875c973ef25ab5b5e9db ("Input: xen-kbdfront - advertise either absolute or relative coordinates"). Driver on restore should ask xen for request-abs-pointer again if it is available. So restore parts that did it before 5ea5254. Acked-by: Olaf Hering <[email protected]> Signed-off-by: Igor Mammedov <[email protected]> [v1: Expanded the commit description] Signed-off-by: Konrad Rzeszutek Wilk <[email protected]> Signed-off-by: Dmitry Torokhov <[email protected]>
2011-04-18Input: estimate number of events per packetJeff Brown2-0/+46
Calculate a default based on the number of ABS axes, REL axes, and MT slots for the device during input device registration. Signed-off-by: Jeff Brown <[email protected]> Reviewed-by: Henrik Rydberg <[email protected]> Signed-off-by: Dmitry Torokhov <[email protected]>
2011-04-18Btrfs: fix free space cache leakChris Mason1-1/+1
The free space caching code was recently reworked to cache all the pages it needed instead of using find_get_page everywhere. One loop was missed though, so it ended up leaking pages. This fixes it to use our page array instead of find_get_page. Signed-off-by: Chris Mason <[email protected]>
2011-04-18block: add blk_run_queue_asyncChristoph Hellwig9-23/+36
Instead of overloading __blk_run_queue to force an offload to kblockd add a new blk_run_queue_async helper to do it explicitly. I've kept the blk_queue_stopped check for now, but I suspect it's not needed as the check we do when the workqueue items runs should be enough. Signed-off-by: Christoph Hellwig <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
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