- 20 3月, 2014 5 次提交
-
-
由 Prabhakar Kushwaha 提交于
CONFIG_FSL_IFC gets enabled by Kconfig dependancies. So remove unnecssary define from the defconfigs Signed-off-by: NPrabhakar Kushwaha <prabhakar@freescale.com> Signed-off-by: NScott Wood <scottwood@freescale.com>
-
由 Tang Yuantian 提交于
Add power sensor chip ina220 node in dts to support power monitor Signed-off-by: NTang Yuantian <Yuantian.Tang@freescale.com> Signed-off-by: NScott Wood <scottwood@freescale.com>
-
由 Luis Henriques 提交于
The MPC7448HPC2 and PPC_HOLLY config options contain TSI108_BRIDGE duplicates since commit: commit 3490cba5 Author: Jon Loeliger <jdl@jdl.com> Date: Wed Jan 23 12:42:50 2008 -0600 [POWERPC] Add initial iomega StorCenter board port. This patch cleans these duplicates. Signed-off-by: NLuis Henriques <luis.henriques@canonical.com> Signed-off-by: NScott Wood <scottwood@freescale.com>
-
由 Minghuan Lian 提交于
For PEXCSRBAR, bit 3-0 indicate prefetchable and address type. So when getting base address, these bits should be masked, otherwise we may get incorrect base address. Signed-off-by: NMinghuan Lian <Minghuan.Lian@freescale.com> Signed-off-by: NScott Wood <scottwood@freescale.com>
-
由 Tang Yuantian 提交于
The following SoCs will be affected: p2041, p3041, p4080, p5020, p5040, b4420, b4860, t4240 Signed-off-by: NTang Yuantian <Yuantian.Tang@freescale.com> Signed-off-by: NLi Yang <leoli@freescale.com> Signed-off-by: NScott Wood <scottwood@freescale.com>
-
- 07 3月, 2014 19 次提交
-
-
由 Stewart Smith 提交于
This enables support for userspace to fetch and initiate FSP and Platform dumps from the service processor (via firmware) through sysfs. Based on original patch from Vasant Hegde <hegdevasant@linux.vnet.ibm.com> Flow: - We register for OPAL notification events. - OPAL sends new dump available notification. - We make information on dump available via sysfs - Userspace requests dump contents - We retrieve the dump via OPAL interface - User copies the dump data - userspace sends ack for dump - We send ACK to OPAL. sysfs files: - We add the /sys/firmware/opal/dump directory - echoing 1 (well, anything, but in future we may support different dump types) to /sys/firmware/opal/dump/initiate_dump will initiate a dump. - Each dump that we've been notified of gets a directory in /sys/firmware/opal/dump/ with a name of the dump type and ID (in hex, as this is what's used elsewhere to identify the dump). - Each dump has files: id, type, dump and acknowledge dump is binary and is the dump itself. echoing 'ack' to acknowledge (currently any string will do) will acknowledge the dump and it will soon after disappear from sysfs. OPAL APIs: - opal_dump_init() - opal_dump_info() - opal_dump_read() - opal_dump_ack() - opal_dump_resend_notification() Currently we are only ever notified for one dump at a time (until the user explicitly acks the current dump, then we get a notification of the next dump), but this kernel code should "just work" when OPAL starts notifying us of all the dumps present. Signed-off-by: NStewart Smith <stewart@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Stewart Smith 提交于
Based on a patch by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> This patch adds support to read error logs from OPAL and export them to userspace through a sysfs interface. We export each log entry as a directory in /sys/firmware/opal/elog/ Currently, OPAL will buffer up to 128 error log records, we don't need to have any knowledge of this limit on the Linux side as that is actually largely transparent to us. Each error log entry has the following files: id, type, acknowledge, raw. Currently we just export the raw binary error log in the 'raw' attribute. In a future patch, we may parse more of the error log to make it a bit easier for userspace (e.g. to be able to display a brief summary in petitboot without having to have a full parser). If we have >128 logs from OPAL, we'll only be notified of 128 until userspace starts acknowledging them. This limitation may be lifted in the future and with this patch, that should "just work" from the linux side. A userspace daemon should: - wait for error log entries using normal mechanisms (we announce creation) - read error log entry - save error log entry safely to disk - acknowledge the error log entry - rinse, repeat. On the Linux side, we read the error log when we're notified of it. This possibly isn't ideal as it would be better to only read them on-demand. However, this doesn't really work with current OPAL interface, so we read the error log immediately when notified at the moment. I've tested this pretty extensively and am rather confident that the linux side of things works rather well. There is currently an issue with the service processor side of things for >128 error logs though. Signed-off-by: NStewart Smith <stewart@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Benjamin Krill 提交于
The previous code added wrong TLBs and causes machine check errors if a driver accessed passed the end of the linear mapping instead of a clean page fault. Signed-off-by: NRalph E. Bellofatto <ralphbel@us.ibm.com> Signed-off-by: NBenjamin Krill <ben@codiert.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Sebastian Siewior 提交于
powerpc uses early_init_dt_scan_chosen() from common fdt code. By enabling this option, the common code can take the built in command line over the one that is comming from bootloader / DT. Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Tyrel Datwyler 提交于
Traditionally it has been drmgr's responsibilty to update the device tree through the /proc/ppc64/ofdt interface after a suspend/resume operation. This patchset however has modified suspend/resume ops to preform an update entirely in the kernel during the resume. Therefore, a mechanism is required to expose that information to drmgr. This patch adds a show function to the "hibernate" attribute that returns 1 if the kernel performs a device tree update after the resume and 0 otherwise. This allows newer versions of drmgr to avoid doing a second unnecessary device tree update. Signed-off-by: NTyrel Datwyler <tyreld@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Haren Myneni 提交于
pHyp can change cache nodes for suspend/resume operation. Currently the device tree is updated by drmgr in userspace after all non boot CPUs are enabled. Hence, we do not modify the cache list based on the latest cache nodes. Also we do not remove cache entries for the primary CPU. This patch removes the cache list for the boot CPU, updates the device tree before enabling nonboot CPUs and adds cache list for the boot cpu. This patch also has the side effect that older versions of drmgr will perform a second device tree update from userspace. While this is a redundant waste of a couple cycles it is harmless since firmware returns the same data for the subsequent update-nodes/properties rtas calls. Signed-off-by: NHaren Myneni <hbabu@us.ibm.com> Signed-off-by: NTyrel Datwyler <tyreld@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Haren Myneni 提交于
The current code makes rtas calls for update-nodes, activate-firmware and then update-nodes again. The FW provides the same data for both update-nodes calls. As a result a proc entry exists error is reported for the second update while adding device nodes. This patch makes a single rtas call for update-nodes after activating the FW. It also add rtas_busy delay for the activate-firmware rtas call. Signed-off-by: NHaren Myneni <hbabu@us.ibm.com> Signed-off-by: NTyrel Datwyler <tyreld@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Shuah Khan 提交于
Change adb platform driver to register pm ops using dev_pm_ops instead of legacy pm_ops. .pm hooks call existing legacy suspend and resume interfaces by passing in the right pm state. Signed-off-by: NShuah Khan <shuah.kh@samsung.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Paul Gortmaker 提交于
This processor/memory module was mostly used on ATCA blades and before that, on cPCI blades. It wasn't really user friendly, with custom non u-boot bootloaders (powerboot/motload) and no real way to recover corrupted boot flash (which was a common problem). As such, it had its day back before the big ppc --> powerpc move to device trees, and that was largely through commercial BSPs that started to dry up around 2007. Systems using one were largely in a "deploy and sustain" mode, so interest in upgrading to new kernels in the field was nil. Also, requiring 50A, 48V power supplies and a 2'x2'x2' ATCA chassis largely rules out any hobbyist/enthusiast interest. The point of all this, is that we might as well delete the in kernel files relating to this platform. No point in continuing to build it via walking the defconfigs or via linux-next testing. Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Brandon Stewart 提交于
Signed-off-by: NBrandon Stewart <stewartb2@gmail.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Nathan Fontenot 提交于
The memory remove code for powerpc/pseries should call remove_memory() so that we are holding the hotplug_memory lock during memory remove operations. This patch updates the memory node remove handler to call remove_memory() and adds a ppc_md.remove_memory() entry to handle pseries specific work that is called from arch_remove_memory(). During memory remove in pseries_remove_memblock() we have to stay with removing memory one section at a time. This is needed because of how memory resources are handled. During memory add for pseries (via the probe file in sysfs) we add memory one section at a time which gives us a memory resource for each section. Future patches will aim to address this so will not have to remove memory one section at a time. Signed-off-by: NNathan Fontenot <nfont@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Michael Ellerman 提交于
Turn Anton's memcpy / copy_tofrom_user test into something that can live in tools/testing/selftests. It requires one turd in arch/powerpc/lib/memcpy_64.S, but it's pretty harmless IMHO. We are sailing very close to the wind with the feature macros. We define them to nothing, which currently means we get a few extra nops and include the unaligned calls. Signed-off-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Mahesh Salgaonkar 提交于
Detect and recover from machine check when inside opal on a special scom load instructions. On specific SCOM read via MMIO we may get a machine check exception with SRR0 pointing inside opal. To recover from MC in this scenario, get a recovery instruction address and return to it from MC. OPAL will export the machine check recoverable ranges through device tree node mcheck-recoverable-ranges under ibm,opal: # hexdump /proc/device-tree/ibm,opal/mcheck-recoverable-ranges 0000000 0000 0000 3000 2804 0000 000c 0000 0000 0000010 3000 2814 0000 0000 3000 27f0 0000 000c 0000020 0000 0000 3000 2814 xxxx xxxx xxxx xxxx 0000030 llll llll yyyy yyyy yyyy yyyy ... ... # where: xxxx xxxx xxxx xxxx = Starting instruction address llll llll = Length of the address range. yyyy yyyy yyyy yyyy = recovery address Each recoverable address range entry is (start address, len, recovery address), 2 cells each for start and recovery address, 1 cell for len, totalling 5 cells per entry. During kernel boot time, build up the recovery table with the list of recovery ranges from device-tree node which will be used during machine check exception to recover from MMIO SCOM UE. Signed-off-by: NMahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Benjamin Herrenschmidt 提交于
This results in oddball messages at boot on other platforms telling us that CPU hotplug isn't supported even when it is. Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Philippe Bergheaud 提交于
This patch fixes the disassembler of the powerpc kernel debugger xmon, for little-endian. Signed-off-by: NPhilippe Bergheaud <felix@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Li Zhong 提交于
This patch reverts my previous "fix", and replace it with the correct fix from Russell. And as Russell pointed out -- dma_set_mask_and_coherent() (and the other dma_set_mask() functions) are really supposed to be used by drivers only. Signed-off-by: NLi Zhong <zhong@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 송은봉 提交于
This patch removes CONFIG_MTD_PARTITIONS in config files for powerpc. Because CONFIG_MTD_PARTITIONS was removed by commit 6a8a98b2. Signed-off-by: NEunbong Song <eunb.song@samsung.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Anton Blanchard 提交于
The 64bit relocation code places a few symbols in the text segment. These symbols are only 4 byte aligned where they need to be 8 byte aligned. Add an explicit alignment. Signed-off-by: NAnton Blanchard <anton@samba.org> Cc: stable@vger.kernel.org Tested-by: NLaurent Dufour <ldufour@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Michael Neuling 提交于
When we fork/clone we currently don't copy any of the TM state to the new thread. This results in a TM bad thing (program check) when the new process is switched in as the kernel does a tmrechkpt with TEXASR FS not set. Also, since R1 is from userspace, we trigger the bad kernel stack pointer detection. So we end up with something like this: Bad kernel stack pointer 0 at c0000000000404fc cpu 0x2: Vector: 700 (Program Check) at [c00000003ffefd40] pc: c0000000000404fc: restore_gprs+0xc0/0x148 lr: 0000000000000000 sp: 0 msr: 9000000100201030 current = 0xc000001dd1417c30 paca = 0xc00000000fe00800 softe: 0 irq_happened: 0x01 pid = 0, comm = swapper/2 WARNING: exception is not recoverable, can't continue The below fixes this by flushing the TM state before we copy the task_struct to the clone. To do this we go through the tmreclaim patch, which removes the checkpointed registers from the CPU and transitions the CPU out of TM suspend mode. Hence we need to call tmrechkpt after to restore the checkpointed state and the TM mode for the current task. To make this fail from userspace is simply: tbegin li r0, 2 sc <boom> Kudos to Adhemerval Zanella Neto for finding this. Signed-off-by: NMichael Neuling <mikey@neuling.org> cc: Adhemerval Zanella Neto <azanella@br.ibm.com> cc: stable@vger.kernel.org Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
- 28 2月, 2014 8 次提交
-
-
由 Benjamin Herrenschmidt 提交于
We need to unmangle the full address, not just the register number, and we also need to support the real indirect bit being set for in-kernel uses. Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> CC: <stable@vger.kernel.org> [v3.13]
-
由 Benjamin Herrenschmidt 提交于
The OPAL firmware functions opal_xscom_read and opal_xscom_write take a 64-bit argument for the XSCOM (PCB) address in order to support the indirect mode on P8. Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> CC: <stable@vger.kernel.org> [v3.13]
-
由 Gavin Shan 提交于
As Ben suggested, the patch prints PHB diag-data with multiple fields in one line and omits the line if the fields of that line are all zero. With the patch applied, the PHB3 diag-data dump looks like: PHB3 PHB#3 Diag-data (Version: 1) brdgCtl: 00000002 RootSts: 0000000f 00400000 b0830008 00100147 00002000 nFir: 0000000000000000 0030006e00000000 0000000000000000 PhbSts: 0000001c00000000 0000000000000000 Lem: 0000000000100000 42498e327f502eae 0000000000000000 InAErr: 8000000000000000 8000000000000000 0402030000000000 0000000000000000 PE[ 8] A/B: 8480002b00000000 8000000000000000 [ The current diag data is so big that it overflows the printk buffer pretty quickly in cases when we get a handful of errors at once which can happen. --BenH ] Signed-off-by: NGavin Shan <shangw@linux.vnet.ibm.com> CC: <stable@vger.kernel.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Gavin Shan 提交于
The PHB diag-data is important to help locating the root cause for EEH errors such as frozen PE or fenced PHB. However, the EEH core enables IO path by clearing part of HW registers before collecting this data causing it to be corrupted. This patch fixes this by dumping the PHB diag-data immediately when frozen/fenced state on PE or PHB is detected for the first time in eeh_ops::get_state() or next_error() backend. Signed-off-by: NGavin Shan <shangw@linux.vnet.ibm.com> CC: <stable@vger.kernel.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Paul Mackerras 提交于
The new ELFv2 little-endian ABI increases the stack redzone -- the area below the stack pointer that can be used for storing data -- from 288 bytes to 512 bytes. This means that we need to allow more space on the user stack when delivering a signal to a 64-bit process. To make the code a bit clearer, we define new USER_REDZONE_SIZE and KERNEL_REDZONE_SIZE symbols in ptrace.h. For now, we leave the kernel redzone size at 288 bytes, since increasing it to 512 bytes would increase the size of interrupt stack frames correspondingly. Gcc currently only makes use of 288 bytes of redzone even when compiling for the new little-endian ABI, and the kernel cannot currently be compiled with the new ABI anyway. In the future, hopefully gcc will provide an option to control the amount of redzone used, and then we could reduce it even more. This also changes the code in arch_compat_alloc_user_space() to preserve the expanded redzone. It is not clear why this function would ever be used on a 64-bit process, though. Signed-off-by: NPaul Mackerras <paulus@samba.org> CC: <stable@vger.kernel.org> [v3.13] Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Liu Ping Fan 提交于
The branch target should be the func addr, not the addr of func_descr_t. So using ppc_function_entry() to generate the right target addr. Signed-off-by: NLiu Ping Fan <pingfank@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Laurent Dufour 提交于
In copy_oldmem_page, the current check using max_pfn and min_low_pfn to decide if the page is backed or not, is not valid when the memory layout is not continuous. This happens when running as a QEMU/KVM guest, where RTAS is mapped higher in the memory. In that case max_pfn points to the end of RTAS, and a hole between the end of the kdump kernel and RTAS is not backed by PTEs. As a consequence, the kdump kernel is crashing in copy_oldmem_page when accessing in a direct way the pages in that hole. This fix relies on the memblock's service memblock_is_region_memory to check if the read page is part or not of the directly accessible memory. Signed-off-by: NLaurent Dufour <ldufour@linux.vnet.ibm.com> Tested-by: NMahesh Salgaonkar <mahesh@linux.vnet.ibm.com> CC: <stable@vger.kernel.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Tony Breeds 提交于
Currently we're storing a host endian RTAS token in rtas_stop_self_args.token. We then pass that directly to rtas. This is fine on big endian however on little endian the token is not what we expect. This will typically result in hitting: panic("Alas, I survived.\n"); To fix this we always use the stop-self token in host order and always convert it to be32 before passing this to rtas. Signed-off-by: NTony Breeds <tony@bakeyournoodle.com> Cc: stable@vger.kernel.org Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
- 17 2月, 2014 8 次提交
-
-
由 Gavin Shan 提交于
We possiblly detect EEH errors during reboot, particularly in kexec path, but it's impossible for device drivers and EEH core to handle or recover them properly. The patch registers one reboot notifier for EEH and disable EEH subsystem during reboot. That means the EEH errors is going to be cleared by hardware reset or second kernel during early stage of PCI probe. Signed-off-by: NGavin Shan <shangw@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Gavin Shan 提交于
The patch cleans up variable eeh_subsystem_enabled so that we needn't refer the variable directly from external. Instead, we will use function eeh_enabled() and eeh_set_enable() to operate the variable. Signed-off-by: NGavin Shan <shangw@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Gavin Shan 提交于
When doing reset in order to recover the affected PE, we issue hot reset on PE primary bus if it's not root bus. Otherwise, we issue hot or fundamental reset on root port or PHB accordingly. For the later case, we didn't cover the situation where PE only includes root port and it potentially causes kernel crash upon EEH error to the PE. The patch reworks the logic of EEH reset to improve the code readability and also avoid the kernel crash. Cc: stable@vger.kernel.org Reported-by: NThadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com> Signed-off-by: NGavin Shan <shangw@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Anton Blanchard 提交于
We are seeing a lot of hits in the VDSO that are not resolved by perf. A while(1) gettimeofday() loop shows the issue: 27.64% [vdso] [.] 0x000000000000060c 22.57% [vdso] [.] 0x0000000000000628 16.88% [vdso] [.] 0x0000000000000610 12.39% [vdso] [.] __kernel_gettimeofday 6.09% [vdso] [.] 0x00000000000005f8 3.58% test [.] 00000037.plt_call.gettimeofday@@GLIBC_2.18 2.94% [vdso] [.] __kernel_datapage_offset 2.90% test [.] main We are using a stripped VDSO image which means only symbols with relocation info can be resolved. There isn't a lot of point to stripping the VDSO, the debug info is only about 1kB: 4680 arch/powerpc/kernel/vdso64/vdso64.so 5815 arch/powerpc/kernel/vdso64/vdso64.so.dbg By using the unstripped image, we can resolve all the symbols in the VDSO and the perf profile data looks much better: 76.53% [vdso] [.] __do_get_tspec 12.20% [vdso] [.] __kernel_gettimeofday 5.05% [vdso] [.] __get_datapage 3.20% test [.] main 2.92% test [.] 00000037.plt_call.gettimeofday@@GLIBC_2.18 Signed-off-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Anton Blanchard 提交于
perf is failing to resolve symbols in the VDSO. A while (1) gettimeofday() loop shows: 93.99% [vdso] [.] 0x00000000000005e0 3.12% test [.] 00000037.plt_call.gettimeofday@@GLIBC_2.18 2.81% test [.] main The reason for this is that we are linking our VDSO shared libraries at 1MB, which is a little weird. Even though this is uncommon, Alan points out that it is valid and we should probably fix perf userspace. Regardless, I can't see a reason why we are doing this. The code is all position independent and we never rely on the VDSO ending up at 1M (and we never place it there on 64bit tasks). Changing our link address to 0x0 fixes perf VDSO symbol resolution: 73.18% [vdso] [.] 0x000000000000060c 12.39% [vdso] [.] __kernel_gettimeofday 3.58% test [.] 00000037.plt_call.gettimeofday@@GLIBC_2.18 2.94% [vdso] [.] __kernel_datapage_offset 2.90% test [.] main We still have some local symbol resolution issues that will be fixed in a subsequent patch. Signed-off-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Aneesh Kumar K.V 提交于
Archs like ppc64 doesn't do tlb flush in set_pte/pmd functions when using a hash table MMU for various reasons (the flush is handled as part of the PTE modification when necessary). ppc64 thus doesn't implement flush_tlb_range for hash based MMUs. Additionally ppc64 require the tlb flushing to be batched within ptl locks. The reason to do that is to ensure that the hash page table is in sync with linux page table. We track the hpte index in linux pte and if we clear them without flushing hash and drop the ptl lock, we can have another cpu update the pte and can end up with duplicate entry in the hash table, which is fatal. We also want to keep set_pte_at simpler by not requiring them to do hash flush for performance reason. We do that by assuming that set_pte_at() is never *ever* called on a PTE that is already valid. This was the case until the NUMA code went in which broke that assumption. Fix that by introducing a new pair of helpers to set _PAGE_NUMA in a way similar to ptep/pmdp_set_wrprotect(), with a generic implementation using set_pte_at() and a powerpc specific one using the appropriate mechanism needed to keep the hash table in sync. Acked-by: NMel Gorman <mgorman@suse.de> Reviewed-by: NRik van Riel <riel@redhat.com> Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Aneesh Kumar K.V 提交于
So move it within the if loop Acked-by: NMel Gorman <mgorman@suse.de> Reviewed-by: NRik van Riel <riel@redhat.com> Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-
由 Aneesh Kumar K.V 提交于
pte_update() is a powerpc-ism used to change the bits of a PTE when the access permission is being restricted (a flush is potentially needed). It uses atomic operations on when needed and handles the hash synchronization on hash based processors. It is currently only used to clear PTE bits and so the current implementation doesn't provide a way to also set PTE bits. The new _PAGE_NUMA bit, when set, is actually restricting access so it must use that function too, so this change adds the ability for pte_update() to also set bits. We will use this later to set the _PAGE_NUMA bit. Acked-by: NMel Gorman <mgorman@suse.de> Acked-by: NRik van Riel <riel@redhat.com> Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
-