mirror of https://gitee.com/openkylin/linux.git
2734 Commits
| Author | SHA1 | Message | Date |
|---|---|---|---|
Mel Gorman
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21d9ee3eda |
mm: remove remaining references to NUMA hinting bits and helpers
This patch removes the NUMA PTE bits and associated helpers. As a
side-effect it increases the maximum possible swap space on x86-64.
One potential source of problems is races between the marking of PTEs
PROT_NONE, NUMA hinting faults and migration. It must be guaranteed that
a PTE being protected is not faulted in parallel, seen as a pte_none and
corrupting memory. The base case is safe but transhuge has problems in
the past due to an different migration mechanism and a dependance on page
lock to serialise migrations and warrants a closer look.
task_work hinting update parallel fault
------------------------ --------------
change_pmd_range
change_huge_pmd
__pmd_trans_huge_lock
pmdp_get_and_clear
__handle_mm_fault
pmd_none
do_huge_pmd_anonymous_page
read? pmd_lock blocks until hinting complete, fail !pmd_none test
write? __do_huge_pmd_anonymous_page acquires pmd_lock, checks pmd_none
pmd_modify
set_pmd_at
task_work hinting update parallel migration
------------------------ ------------------
change_pmd_range
change_huge_pmd
__pmd_trans_huge_lock
pmdp_get_and_clear
__handle_mm_fault
do_huge_pmd_numa_page
migrate_misplaced_transhuge_page
pmd_lock waits for updates to complete, recheck pmd_same
pmd_modify
set_pmd_at
Both of those are safe and the case where a transhuge page is inserted
during a protection update is unchanged. The case where two processes try
migrating at the same time is unchanged by this series so should still be
ok. I could not find a case where we are accidentally depending on the
PTE not being cleared and flushed. If one is missed, it'll manifest as
corruption problems that start triggering shortly after this series is
merged and only happen when NUMA balancing is enabled.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Tested-by: Sasha Levin <sasha.levin@oracle.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Dave Jones <davej@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Mel Gorman
|
e7bb4b6d16 |
mm: add p[te|md] protnone helpers for use by NUMA balancing
This is a preparatory patch that introduces protnone helpers for automatic NUMA balancing. Signed-off-by: Mel Gorman <mgorman@suse.de> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Acked-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Tested-by: Sasha Levin <sasha.levin@oracle.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Dave Jones <davej@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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Linus Torvalds
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a26be149fa |
IOMMU Updates for Linux v3.20
This time with:
* Generic page-table framework for ARM IOMMUs using the LPAE page-table
format, ARM-SMMU and Renesas IPMMU make use of it already.
* Break out of the IO virtual address allocator from the Intel IOMMU so
that it can be used by other DMA-API implementations too. The first
user will be the ARM64 common DMA-API implementation for IOMMUs
* Device tree support for Renesas IPMMU
* Various fixes and cleanups all over the place
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Merge tag 'iommu-updates-v3.20' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
Pull IOMMU updates from Joerg Roedel:
"This time with:
- Generic page-table framework for ARM IOMMUs using the LPAE
page-table format, ARM-SMMU and Renesas IPMMU make use of it
already.
- Break out the IO virtual address allocator from the Intel IOMMU so
that it can be used by other DMA-API implementations too. The
first user will be the ARM64 common DMA-API implementation for
IOMMUs
- Device tree support for Renesas IPMMU
- Various fixes and cleanups all over the place"
* tag 'iommu-updates-v3.20' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (36 commits)
iommu/amd: Convert non-returned local variable to boolean when relevant
iommu: Update my email address
iommu/amd: Use wait_event in put_pasid_state_wait
iommu/amd: Fix amd_iommu_free_device()
iommu/arm-smmu: Avoid build warning
iommu/fsl: Various cleanups
iommu/fsl: Use %pa to print phys_addr_t
iommu/omap: Print phys_addr_t using %pa
iommu: Make more drivers depend on COMPILE_TEST
iommu/ipmmu-vmsa: Fix IOMMU lookup when multiple IOMMUs are registered
iommu: Disable on !MMU builds
iommu/fsl: Remove unused fsl_of_pamu_ids[]
iommu/fsl: Fix section mismatch
iommu/ipmmu-vmsa: Use the ARM LPAE page table allocator
iommu: Fix trace_map() to report original iova and original size
iommu/arm-smmu: add support for iova_to_phys through ATS1PR
iopoll: Introduce memory-mapped IO polling macros
iommu/arm-smmu: don't touch the secure STLBIALL register
iommu/arm-smmu: make use of generic LPAE allocator
iommu: io-pgtable-arm: add non-secure quirk
...
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Linus Torvalds
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59d53737a8 |
Merge branch 'akpm' (patches from Andrew)
Merge second set of updates from Andrew Morton: "More of MM" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (83 commits) mm/nommu.c: fix arithmetic overflow in __vm_enough_memory() mm/mmap.c: fix arithmetic overflow in __vm_enough_memory() vmstat: Reduce time interval to stat update on idle cpu mm/page_owner.c: remove unnecessary stack_trace field Documentation/filesystems/proc.txt: describe /proc/<pid>/map_files mm: incorporate read-only pages into transparent huge pages vmstat: do not use deferrable delayed work for vmstat_update mm: more aggressive page stealing for UNMOVABLE allocations mm: always steal split buddies in fallback allocations mm: when stealing freepages, also take pages created by splitting buddy page mincore: apply page table walker on do_mincore() mm: /proc/pid/clear_refs: avoid split_huge_page() mm: pagewalk: fix misbehavior of walk_page_range for vma(VM_PFNMAP) mempolicy: apply page table walker on queue_pages_range() arch/powerpc/mm/subpage-prot.c: use walk->vma and walk_page_vma() memcg: cleanup preparation for page table walk numa_maps: remove numa_maps->vma numa_maps: fix typo in gather_hugetbl_stats pagemap: use walk->vma instead of calling find_vma() clear_refs: remove clear_refs_private->vma and introduce clear_refs_test_walk() ... |
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Linus Torvalds
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d3f180ea1a |
powerpc updates for 3.20
Including:
- Update of all defconfigs
- Addition of a bunch of config options to modernise our defconfigs
- Some PS3 updates from Geoff
- Optimised memcmp for 64 bit from Anton
- Fix for kprobes that allows 'perf probe' to work from Naveen
- Several cxl updates from Ian & Ryan
- Expanded support for the '24x7' PMU from Cody & Sukadev
- Freescale updates from Scott:
"Highlights include 8xx optimizations, some more work on datapath device
tree content, e300 machine check support, t1040 corenet error reporting,
and various cleanups and fixes."
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Merge tag 'powerpc-3.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux
Pull powerpc updates from Michael Ellerman:
- Update of all defconfigs
- Addition of a bunch of config options to modernise our defconfigs
- Some PS3 updates from Geoff
- Optimised memcmp for 64 bit from Anton
- Fix for kprobes that allows 'perf probe' to work from Naveen
- Several cxl updates from Ian & Ryan
- Expanded support for the '24x7' PMU from Cody & Sukadev
- Freescale updates from Scott:
"Highlights include 8xx optimizations, some more work on datapath
device tree content, e300 machine check support, t1040 corenet
error reporting, and various cleanups and fixes"
* tag 'powerpc-3.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux: (102 commits)
cxl: Add missing return statement after handling AFU errror
cxl: Fail AFU initialisation if an invalid configuration record is found
cxl: Export optional AFU configuration record in sysfs
powerpc/mm: Warn on flushing tlb page in kernel context
powerpc/powernv: Add OPAL soft-poweroff routine
powerpc/perf/hv-24x7: Document sysfs event description entries
powerpc/perf/hv-gpci: add the remaining gpci requests
powerpc/perf/{hv-gpci, hv-common}: generate requests with counters annotated
powerpc/perf/hv-24x7: parse catalog and populate sysfs with events
perf: define EVENT_DEFINE_RANGE_FORMAT_LITE helper
perf: add PMU_EVENT_ATTR_STRING() helper
perf: provide sysfs_show for struct perf_pmu_events_attr
powerpc/kernel: Avoid initializing device-tree pointer twice
powerpc: Remove old compile time disabled syscall tracing code
powerpc/kernel: Make syscall_exit a local label
cxl: Fix device_node reference counting
powerpc/mm: bail out early when flushing TLB page
powerpc: defconfigs: add MTD_SPI_NOR (new dependency for M25P80)
perf/powerpc: reset event hw state when adding it to the PMU
powerpc/qe: Use strlcpy()
...
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Kirill A. Shutemov
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d016bf7ece |
mm: make FIRST_USER_ADDRESS unsigned long on all archs
LKP has triggered a compiler warning after my recent patch "mm: account
pmd page tables to the process":
mm/mmap.c: In function 'exit_mmap':
>> mm/mmap.c:2857:2: warning: right shift count >= width of type [enabled by default]
The code:
> 2857 WARN_ON(mm_nr_pmds(mm) >
2858 round_up(FIRST_USER_ADDRESS, PUD_SIZE) >> PUD_SHIFT);
In this, on tile, we have FIRST_USER_ADDRESS defined as 0. round_up() has
the same type -- int. PUD_SHIFT.
I think the best way to fix it is to define FIRST_USER_ADDRESS as unsigned
long. On every arch for consistency.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Joonsoo Kim
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7b02190c27 |
mm/debug_pagealloc: fix build failure on ppc and some other archs
Kim Phillips reported following build failure.
LD init/built-in.o
mm/built-in.o: In function `free_pages_prepare':
mm/page_alloc.c:770: undefined reference to `.kernel_map_pages'
mm/built-in.o: In function `prep_new_page':
mm/page_alloc.c:933: undefined reference to `.kernel_map_pages'
mm/built-in.o: In function `map_pages':
mm/compaction.c:61: undefined reference to `.kernel_map_pages'
make: *** [vmlinux] Error 1
Reason for this problem is that commit
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Joel Stanley
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7f43e71e8c |
powerpc/powernv: Add OPAL soft-poweroff routine
Register a notifier for a OPAL message indicating that the machine should prepare itself for a graceful power off. OPAL will tell us if the power off is a reboot or shutdown, but for now we perform the same orderly_poweroff action. Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Michael Ellerman
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a604c96eb0 |
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/scottwood/linux into next
Freescale updates from Scott: "Highlights include 8xx optimizations, some more work on datapath device tree content, e300 machine check support, t1040 corenet error reporting, and various cleanups and fixes." |
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Emil Medve
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cd70d4659f |
iommu/fsl: Various cleanups
Currently a PAMU driver patch is very likely to receive some checkpatch complaints about the code in the context of the patch. This patch is an attempt to fix most of that and make the driver more readable Also fixed a subset of the sparse and coccinelle reported issues. Signed-off-by: Emil Medve <Emilian.Medve@Freescale.com> Signed-off-by: Joerg Roedel <jroedel@suse.de> |
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Ryan Grimm
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6f963ec2d6 |
cxl: Fix device_node reference counting
When unbinding and rebinding the driver on a system with a card in PHB0, this error condition is reached after a few attempts: ERROR: Bad of_node_put() on /pciex@3fffe40000000 CPU: 0 PID: 3040 Comm: bash Not tainted 3.18.0-rc3-12545-g3627ffe #152 Call Trace: [c000000721acb5c0] [c00000000086ef94] .dump_stack+0x84/0xb0 (unreliable) [c000000721acb640] [c00000000073a0a8] .of_node_release+0xd8/0xe0 [c000000721acb6d0] [c00000000044bc44] .kobject_release+0x74/0xe0 [c000000721acb760] [c0000000007394fc] .of_node_put+0x1c/0x30 [c000000721acb7d0] [c000000000545cd8] .cxl_probe+0x1a98/0x1d50 [c000000721acb900] [c0000000004845a0] .local_pci_probe+0x40/0xc0 [c000000721acb980] [c000000000484998] .pci_device_probe+0x128/0x170 [c000000721acba30] [c00000000052400c] .driver_probe_device+0xac/0x2a0 [c000000721acbad0] [c000000000522468] .bind_store+0x108/0x160 [c000000721acbb70] [c000000000521448] .drv_attr_store+0x38/0x60 [c000000721acbbe0] [c000000000293840] .sysfs_kf_write+0x60/0xa0 [c000000721acbc50] [c000000000292500] .kernfs_fop_write+0x140/0x1d0 [c000000721acbcf0] [c000000000208648] .vfs_write+0xd8/0x260 [c000000721acbd90] [c000000000208b18] .SyS_write+0x58/0x100 [c000000721acbe30] [c000000000009258] syscall_exit+0x0/0x98 We are missing a call to of_node_get(). pnv_pci_to_phb_node() should call of_node_get() otherwise np's reference count isn't incremented and it might go away. Rename pnv_pci_to_phb_node() to pnv_pci_get_phb_node() so it's clear it calls of_node_get(). Signed-off-by: Ryan Grimm <grimm@linux.vnet.ibm.com> Acked-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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LEROY Christophe
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ce67f5d0a0 |
powerpc32: Use kmem_cache memory for PGDIR
When pages are not 4K, PGDIR table is allocated with kmalloc(). In order to optimise TLB handlers, aligned memory is needed. kmalloc() doesn't provide aligned memory blocks, so lets use a kmem_cache pool instead. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <scottwood@freescale.com> |
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LEROY Christophe
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cadbfd0146 |
powerpc/8xx: use _PAGE_RO instead of _PAGE_RW
On powerpc 8xx, in TLB entries, 0x400 bit is set to 1 for read-only pages and is set to 0 for RW pages. So we should use _PAGE_RO instead of _PAGE_RW Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <scottwood@freescale.com> |
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LEROY Christophe
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a7b9f671f2 |
powerpc32: adds handling of _PAGE_RO
Some powerpc like the 8xx don't have a RW bit in PTE bits but a RO (Read Only) bit. This patch implements the handling of a _PAGE_RO flag to be used in place of _PAGE_RW Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> [scottwood@freescale.com: fix whitespace] Signed-off-by: Scott Wood <scottwood@freescale.com> |
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Kim Phillips
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6d5f6a0eba |
powerpc/fsl_pci: Fix pci stack build bug with FRAME_WARN
Fix this: CC arch/powerpc/sysdev/fsl_pci.o arch/powerpc/sysdev/fsl_pci.c: In function 'fsl_pcie_check_link': arch/powerpc/sysdev/fsl_pci.c:91:1: error: the frame size of 1360 bytes is larger than 1024 bytes [-Werror=frame-larger-than=] when configuring FRAME_WARN, by refactoring indirect_read_config() to take hose and bus number instead of the 1344-byte struct pci_bus. Signed-off-by: Kim Phillips <kim.phillips@freescale.com> Signed-off-by: Scott Wood <scottwood@freescale.com> |
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Michael Ellerman
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8aa989b8fb |
powerpc: Remove some unused functions
Remove slice_set_psize() which is not used. It was added in |
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Cyril Bur
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3df76a9dcc |
powerpc/pseries: Fix endian problems with LE migration
RTAS events require arguments be passed in big endian while hypercalls have their arguments passed in registers and the values should therefore be in CPU endian. The "ibm,suspend_me" 'RTAS' call makes a sequence of hypercalls to setup one true RTAS call. This means that "ibm,suspend_me" is handled specially in the ppc_rtas() syscall. The ppc_rtas() syscall has its arguments in big endian and can therefore pass these arguments directly to the RTAS call. "ibm,suspend_me" is handled specially from within ppc_rtas() (by calling rtas_ibm_suspend_me()) which has left an endian bug on little endian systems due to the requirement of hypercalls. The return value from rtas_ibm_suspend_me() gets returned in cpu endian, and is left unconverted, also a bug on little endian systems. rtas_ibm_suspend_me() does not actually make use of the rtas_args that it is passed. This patch removes the convoluted use of the rtas_args struct to pass params to rtas_ibm_suspend_me() in favour of passing what it needs as actual arguments. This patch also ensures the two callers of rtas_ibm_suspend_me() pass function parameters in cpu endian and in the case of ppc_rtas(), converts the return value. migrate_store() (the other caller of rtas_ibm_suspend_me()) is from a sysfs file which deals with everything in cpu endian so this function only underwent cleanup. This patch has been tested with KVM both LE and BE and on PowerVM both LE and BE. Under QEMU/KVM the migration happens without touching these code pathes. For PowerVM there is no obvious regression on BE and the LE code path now provides the correct parameters to the hypervisor. Signed-off-by: Cyril Bur <cyrilbur@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Gavin Shan
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1b28f170d9 |
powerpc/eeh: Allow to set maximal frozen times
When PE's frozen count hits maximal allowed frozen times, which is 5 currently, it will be forced to be offline permanently. Once the PE is removed permanently, rebooting machine is required to bring the PE back. It's not convienent when testing EEH functionality. The patch exports the maximal allowed frozen times through debugfs entry (/sys/kernel/debug/powerpc/eeh_max_freezes). Requested-by: Ryan Grimm <grimm@linux.vnet.ibm.com> Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Gavin Shan
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432227e907 |
powerpc/eeh: Introduce flag EEH_PE_REMOVED
The conditions that one specific PE's frozen count exceeds the maximal allowed times (EEH_MAX_ALLOWED_FREEZES) and it's in isolated or recovery state indicate the PE was removed permanently implicitly. The patch introduces flag EEH_PE_REMOVED to indicate that explicitly so that we don't depend on the fixed maximal allowed times, which can be varied as we do in subsequent patch. Flag EEH_PE_REMOVED is expected to be marked for the PE whose frozen count exceeds the maximal allowed times, or just failed from recovery. Requested-by: Ryan Grimm <grimm@linux.vnet.ibm.com> Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Gavin Shan
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2aa5cf9e48 |
powerpc/eeh: Fix missed PE#0 on P7IOC
PE#0 should be regarded as valid for P7IOC, while it's invalid for
PHB3. The patch adds flag EEH_VALID_PE_ZERO to differentiate those
two cases. Without the patch, we possibly see frozen PE#0 state is
cleared without EEH recovery taken on P7IOC as following kernel logs
indicate:
[root@ltcfbl8eb ~]# dmesg
:
pci 0000:00 : [PE# 000] Secondary bus 0 associated with PE#0
pci 0000:01 : [PE# 001] Secondary bus 1 associated with PE#1
pci 0001:00 : [PE# 000] Secondary bus 0 associated with PE#0
pci 0001:01 : [PE# 001] Secondary bus 1 associated with PE#1
pci 0002:00 : [PE# 000] Secondary bus 0 associated with PE#0
pci 0002:01 : [PE# 001] Secondary bus 1 associated with PE#1
pci 0003:00 : [PE# 000] Secondary bus 0 associated with PE#0
pci 0003:01 : [PE# 001] Secondary bus 1 associated with PE#1
pci 0003:20 : [PE# 002] Secondary bus 32..63 associated with PE#2
:
EEH: Clear non-existing PHB#3-PE#0
EEH: PHB location: U78AE.001.WZS00M9-P1-002
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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Naveen N. Rao
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bf794bf52a |
powerpc/kprobes: Fix kallsyms lookup across powerpc ABIv1 and ABIv2
Currently, all non-dot symbols are being treated as function descriptors
in ABIv1. This is incorrect and is resulting in perf probe not working:
# perf probe do_fork
Added new event:
Failed to write event: Invalid argument
Error: Failed to add events.
# dmesg | tail -1
[192268.073063] Could not insert probe at _text+768432: -22
perf probe bases all kernel probes on _text and writes,
for example, "p:probe/do_fork _text+768432" to
/sys/kernel/debug/tracing/kprobe_events. In-kernel, _text is being
considered to be a function descriptor and is resulting in the above
error.
Fix this by changing how we lookup symbol addresses on ppc64. We first
check for the dot variant of a symbol and look at the non-dot variant
only if that fails. In this manner, we avoid having to look at the
function descriptor.
While at it, also separate out how this works on ABIv2 where
we don't have dot symbols, but need to use the local entry point.
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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Michael Ellerman
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10ea834364 |
powerpc: Rename _TIF_SYSCALL_T_OR_A to _TIF_SYSCALL_DOTRACE
Once upon a time, at least 9 years ago (< 2.6.12), _TIF_SYSCALL_T_OR_A meant "TRACE or AUDIT". But these days it means TRACE or AUDIT or SECCOMP or TRACEPOINT or NOHZ. All of those are implemented via syscall_dotrace() so rename the flag to that to try and clarify things. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Michael Ellerman
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ed77d4182b |
powerpc: Remove unused CPU_FTR_IABR
We removed the last usage of CPU_FTR_IABR in commit
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Ryan Grimm
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1212aa1c8c |
cxl: Enable CAPP recovery
Turning snoops on is the last step in CAPP recovery. Sapphire is expected to have reinitialized the PHB and done the previous recovery steps. Add mode argument to opal call to do this. Driver can turn snoops off although it does not currently. Signed-off-by: Ryan Grimm <grimm@linux.vnet.ibm.com> Acked-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Michael Ellerman
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a87e810f61 |
powerpc: Work around gcc bug in current_thread_info()
In commit |
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Hari Bathini
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c1caae3de4 |
powerpc/kdump: Ignore failure in enabling big endian exception during crash
In LE kernel, we currently have a hack for kexec that resets the exception endian before starting a new kernel as the kernel that is loaded could be a big endian or a little endian kernel. In kdump case, resetting exception endian fails when one or more cpus is disabled. But we can ignore the failure and still go ahead, as in most cases crashkernel will be of same endianess as primary kernel and reseting endianess is not even needed in those cases. This patch adds a new inline function to say if this is kdump path. This function is used at places where such a check is needed. Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com> [mpe: Rename to kdump_in_progress(), use bool, and edit comment] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Pranith Kumar
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1e5d0fdb5b |
powerpc: Wire up sys_execveat() syscall
Wire up sys_execveat(). This passes the selftests for the system call. Check success of execveat(3, '../execveat', 0)... [OK] Check success of execveat(5, 'execveat', 0)... [OK] Check success of execveat(6, 'execveat', 0)... [OK] Check success of execveat(-100, '/home/pranith/linux/...ftests/exec/execveat', 0)... [OK] Check success of execveat(99, '/home/pranith/linux/...ftests/exec/execveat', 0)... [OK] Check success of execveat(8, '', 4096)... [OK] Check success of execveat(17, '', 4096)... [OK] Check success of execveat(9, '', 4096)... [OK] Check success of execveat(14, '', 4096)... [OK] Check success of execveat(14, '', 4096)... [OK] Check success of execveat(15, '', 4096)... [OK] Check failure of execveat(8, '', 0) with ENOENT... [OK] Check failure of execveat(8, '(null)', 4096) with EFAULT... [OK] Check success of execveat(5, 'execveat.symlink', 0)... [OK] Check success of execveat(6, 'execveat.symlink', 0)... [OK] Check success of execveat(-100, '/home/pranith/linux/...xec/execveat.symlink', 0)... [OK] Check success of execveat(10, '', 4096)... [OK] Check success of execveat(10, '', 4352)... [OK] Check failure of execveat(5, 'execveat.symlink', 256) with ELOOP... [OK] Check failure of execveat(6, 'execveat.symlink', 256) with ELOOP... [OK] Check failure of execveat(-100, '/home/pranith/linux/tools/testing/selftests/exec/execveat.symlink', 256) with ELOOP... [OK] Check success of execveat(3, '../script', 0)... [OK] Check success of execveat(5, 'script', 0)... [OK] Check success of execveat(6, 'script', 0)... [OK] Check success of execveat(-100, '/home/pranith/linux/...elftests/exec/script', 0)... [OK] Check success of execveat(13, '', 4096)... [OK] Check success of execveat(13, '', 4352)... [OK] Check failure of execveat(18, '', 4096) with ENOENT... [OK] Check failure of execveat(7, 'script', 0) with ENOENT... [OK] Check success of execveat(16, '', 4096)... [OK] Check success of execveat(16, '', 4096)... [OK] Check success of execveat(4, '../script', 0)... [OK] Check success of execveat(4, 'script', 0)... [OK] Check success of execveat(4, '../script', 0)... [OK] Check failure of execveat(4, 'script', 0) with ENOENT... [OK] Check failure of execveat(5, 'execveat', 65535) with EINVAL... [OK] Check failure of execveat(5, 'no-such-file', 0) with ENOENT... [OK] Check failure of execveat(6, 'no-such-file', 0) with ENOENT... [OK] Check failure of execveat(-100, 'no-such-file', 0) with ENOENT... [OK] Check failure of execveat(5, '', 4096) with EACCES... [OK] Check failure of execveat(5, 'Makefile', 0) with EACCES... [OK] Check failure of execveat(11, '', 4096) with EACCES... [OK] Check failure of execveat(12, '', 4096) with EACCES... [OK] Check failure of execveat(99, '', 4096) with EBADF... [OK] Check failure of execveat(99, 'execveat', 0) with EBADF... [OK] Check failure of execveat(8, 'execveat', 0) with ENOTDIR... [OK] Invoke copy of 'execveat' via filename of length 4093: Check success of execveat(19, '', 4096)... [OK] Check success of execveat(5, 'xxxxxxxxxxxxxxxxxxxx...yyyyyyyyyyyyyyyyyyyy', 0)... [OK] Invoke copy of 'script' via filename of length 4093: Check success of execveat(20, '', 4096)... [OK] /bin/sh: 0: Can't open /dev/fd/5/xxxxxxx(... a long line of x's and y's, 0)... [OK] Check success of execveat(5, 'xxxxxxxxxxxxxxxxxxxx...yyyyyyyyyyyyyyyyyyyy', 0)... [OK] Tested on a 32-bit powerpc system. Signed-off-by: Pranith Kumar <bobby.prani@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Linus Torvalds
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34b85e3574 |
powerpc updates for 3.19 batch 2
The highlight is the series that reworks the idle management on powernv, which allows us to use deeper idle states on those machines. There's the fix from Anton for the "BUG at kernel/smpboot.c:134!" problem. An i2c driver for powernv. This is acked by Wolfram Sang, and he asked that we take it through the powerpc tree. A fix for audit from rgb at Red Hat, acked by Paul Moore who is one of the audit maintainers. A patch from Ben to export the symbol map of our OPAL firmware as a sysfs file, so that tools can use it. Also some CXL fixes, a couple of powerpc perf fixes, a fix for smt-enabled, and the patch to add __force to get_user() so we can use bitwise types. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJUk+oCAAoJEFHr6jzI4aWADBAP/i/CJ+cu6o4mzNDdfs8bnxqn RGZCSV+SrkTZPcoLbLiM9iaqq34ORVIn7hwkhkTz2/koluMVfTsqtVulMoFf+hVd GTVt81MjMFzA3hM3bXEV58KRT79+64K54dLCe0F7OaD6f4AikKR4LLz/PY0EBMiZ 2h13uQlfglaMeYTsaD9eeUpIIKs7+PwsNqUknmN9We07WWfxWqnRpiTR4TYTMXx4 3lQPvCnnHokwDqjuKgwiqDVSaCfCl8laS1i+BPk0G0aRV1AnPDvR3MhgVb2IpNxX Joxy2D1HSawwDhqHOsId8dkGZXOM4vzo+Y658qnC1XfThqE0MhA+kCfa5/b6xlOR K7nDO5A41B6nXB3mMOQh/szTXSIa8KJRTR3ibbJJrMdF6F0TN0JLLQNUcmM4j/5D vvgZEzvFNZhWX98ktlQLde2E4ClWJg6mWESCGSgJeVjIXaxe/6GneIa8vLKm5QMu OoykNsASMDGqddYMGoYeX/mSsvjPjK0PDO2q19sPbkP8xpyDLx6J8xo+5hO4l8xc 0Cdb38ECfeno+w5oKAnjidHnz0KYBsuYFLeS+rV0b8sUSWAzfdEjSn2AVIQ8gLOv IOCAqwZ5tL9EcUs+AKru5EHtBEV+2XB54xPRxfdFS/k+vYRE7MpS3ipxveIynN2l eRxf9hsSO7ASNDd0b3ID =GXdK -----END PGP SIGNATURE----- Merge tag 'powerpc-3.19-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux Pull second batch of powerpc updates from Michael Ellerman: "The highlight is the series that reworks the idle management on powernv, which allows us to use deeper idle states on those machines. There's the fix from Anton for the "BUG at kernel/smpboot.c:134!" problem. An i2c driver for powernv. This is acked by Wolfram Sang, and he asked that we take it through the powerpc tree. A fix for audit from rgb at Red Hat, acked by Paul Moore who is one of the audit maintainers. A patch from Ben to export the symbol map of our OPAL firmware as a sysfs file, so that tools can use it. Also some CXL fixes, a couple of powerpc perf fixes, a fix for smt-enabled, and the patch to add __force to get_user() so we can use bitwise types" * tag 'powerpc-3.19-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux: powerpc/powernv: Ignore smt-enabled on Power8 and later powerpc/uaccess: Allow get_user() with bitwise types powerpc/powernv: Expose OPAL firmware symbol map powernv/powerpc: Add winkle support for offline cpus powernv/cpuidle: Redesign idle states management powerpc/powernv: Enable Offline CPUs to enter deep idle states powerpc/powernv: Switch off MMU before entering nap/sleep/rvwinkle mode i2c: Driver to expose PowerNV platform i2c busses powerpc: add little endian flag to syscall_get_arch() power/perf/hv-24x7: Use kmem_cache_free() instead of kfree powerpc/perf/hv-24x7: Use per-cpu page buffer cxl: Unmap MMIO regions when detaching a context cxl: Add timeout to process element commands cxl: Change contexts_lock to a mutex to fix sleep while atomic bug powerpc: Secondary CPUs must set cpu_callin_map after setting active and online |
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Linus Torvalds
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66dcff86ba |
3.19 changes for KVM:
- spring cleaning: removed support for IA64, and for hardware-assisted
virtualization on the PPC970
- ARM, PPC, s390 all had only small fixes
For x86:
- small performance improvements (though only on weird guests)
- usual round of hardware-compliancy fixes from Nadav
- APICv fixes
- XSAVES support for hosts and guests. XSAVES hosts were broken because
the (non-KVM) XSAVES patches inadvertently changed the KVM userspace
ABI whenever XSAVES was enabled; hence, this part is going to stable.
Guest support is just a matter of exposing the feature and CPUID leaves
support.
Right now KVM is broken for PPC BookE in your tree (doesn't compile).
I'll reply to the pull request with a patch, please apply it either
before the pull request or in the merge commit, in order to preserve
bisectability somewhat.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull KVM update from Paolo Bonzini:
"3.19 changes for KVM:
- spring cleaning: removed support for IA64, and for hardware-
assisted virtualization on the PPC970
- ARM, PPC, s390 all had only small fixes
For x86:
- small performance improvements (though only on weird guests)
- usual round of hardware-compliancy fixes from Nadav
- APICv fixes
- XSAVES support for hosts and guests. XSAVES hosts were broken
because the (non-KVM) XSAVES patches inadvertently changed the KVM
userspace ABI whenever XSAVES was enabled; hence, this part is
going to stable. Guest support is just a matter of exposing the
feature and CPUID leaves support"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (179 commits)
KVM: move APIC types to arch/x86/
KVM: PPC: Book3S: Enable in-kernel XICS emulation by default
KVM: PPC: Book3S HV: Improve H_CONFER implementation
KVM: PPC: Book3S HV: Fix endianness of instruction obtained from HEIR register
KVM: PPC: Book3S HV: Remove code for PPC970 processors
KVM: PPC: Book3S HV: Tracepoints for KVM HV guest interactions
KVM: PPC: Book3S HV: Simplify locking around stolen time calculations
arch: powerpc: kvm: book3s_paired_singles.c: Remove unused function
arch: powerpc: kvm: book3s_pr.c: Remove unused function
arch: powerpc: kvm: book3s.c: Remove some unused functions
arch: powerpc: kvm: book3s_32_mmu.c: Remove unused function
KVM: PPC: Book3S HV: Check wait conditions before sleeping in kvmppc_vcore_blocked
KVM: PPC: Book3S HV: ptes are big endian
KVM: PPC: Book3S HV: Fix inaccuracies in ICP emulation for H_IPI
KVM: PPC: Book3S HV: Fix KSM memory corruption
KVM: PPC: Book3S HV: Fix an issue where guest is paused on receiving HMI
KVM: PPC: Book3S HV: Fix computation of tlbie operand
KVM: PPC: Book3S HV: Add missing HPTE unlock
KVM: PPC: BookE: Improve irq inject tracepoint
arm/arm64: KVM: Require in-kernel vgic for the arch timers
...
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Michael S. Tsirkin
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505e428374 |
powerpc/uaccess: Allow get_user() with bitwise types
At the moment, if p and x are both of the same bitwise type (eg. __le32), get_user(x, p) produces a sparse warning. This is because *p is loaded into a long then cast back to typeof(*p). When typeof(*p) is a bitwise type (which is uncommon), such a cast needs __force, otherwise sparse produces a warning. For non-bitwise types __force should have no effect, and should not hide any legitimate errors. Note that we are casting to typeof(*p) not typeof(x). Even with the cast, if x and *p are of different types we should get the warning, so I think we are not loosing the ability to detect any actual errors. virtio would like to use bitwise types with get_user() so fix these spurious warnings by adding __force. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> [mpe: Fill in changelog with more details] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Sam Bobroff
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90fd09f804 |
KVM: PPC: Book3S HV: Improve H_CONFER implementation
Currently the H_CONFER hcall is implemented in kernel virtual mode, meaning that whenever a guest thread does an H_CONFER, all the threads in that virtual core have to exit the guest. This is bad for performance because it interrupts the other threads even if they are doing useful work. The H_CONFER hcall is called by a guest VCPU when it is spinning on a spinlock and it detects that the spinlock is held by a guest VCPU that is currently not running on a physical CPU. The idea is to give this VCPU's time slice to the holder VCPU so that it can make progress towards releasing the lock. To avoid having the other threads exit the guest unnecessarily, we add a real-mode implementation of H_CONFER that checks whether the other threads are doing anything. If all the other threads are idle (i.e. in H_CEDE) or trying to confer (i.e. in H_CONFER), it returns H_TOO_HARD which causes a guest exit and allows the H_CONFER to be handled in virtual mode. Otherwise it spins for a short time (up to 10 microseconds) to give other threads the chance to observe that this thread is trying to confer. The spin loop also terminates when any thread exits the guest or when all other threads are idle or trying to confer. If the timeout is reached, the H_CONFER returns H_SUCCESS. In this case the guest VCPU will recheck the spinlock word and most likely call H_CONFER again. This also improves the implementation of the H_CONFER virtual mode handler. If the VCPU is part of a virtual core (vcore) which is runnable, there will be a 'runner' VCPU which has taken responsibility for running the vcore. In this case we yield to the runner VCPU rather than the target VCPU. We also introduce a check on the target VCPU's yield count: if it differs from the yield count passed to H_CONFER, the target VCPU has run since H_CONFER was called and may have already released the lock. This check is required by PAPR. Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de> |
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Paul Mackerras
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4a157d61b4 |
KVM: PPC: Book3S HV: Fix endianness of instruction obtained from HEIR register
There are two ways in which a guest instruction can be obtained from the guest in the guest exit code in book3s_hv_rmhandlers.S. If the exit was caused by a Hypervisor Emulation interrupt (i.e. an illegal instruction), the offending instruction is in the HEIR register (Hypervisor Emulation Instruction Register). If the exit was caused by a load or store to an emulated MMIO device, we load the instruction from the guest by turning data relocation on and loading the instruction with an lwz instruction. Unfortunately, in the case where the guest has opposite endianness to the host, these two methods give results of different endianness, but both get put into vcpu->arch.last_inst. The HEIR value has been loaded using guest endianness, whereas the lwz will load the instruction using host endianness. The rest of the code that uses vcpu->arch.last_inst assumes it was loaded using host endianness. To fix this, we define a new vcpu field to store the HEIR value. Then, in kvmppc_handle_exit_hv(), we transfer the value from this new field to vcpu->arch.last_inst, doing a byte-swap if the guest and host endianness differ. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de> |
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Paul Mackerras
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c17b98cf60 |
KVM: PPC: Book3S HV: Remove code for PPC970 processors
This removes the code that was added to enable HV KVM to work on PPC970 processors. The PPC970 is an old CPU that doesn't support virtualizing guest memory. Removing PPC970 support also lets us remove the code for allocating and managing contiguous real-mode areas, the code for the !kvm->arch.using_mmu_notifiers case, the code for pinning pages of guest memory when first accessed and keeping track of which pages have been pinned, and the code for handling H_ENTER hypercalls in virtual mode. Book3S HV KVM is now supported only on POWER7 and POWER8 processors. The KVM_CAP_PPC_RMA capability now always returns 0. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de> |
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Paul Mackerras
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2711e248a3 |
KVM: PPC: Book3S HV: Simplify locking around stolen time calculations
Currently the calculations of stolen time for PPC Book3S HV guests uses fields in both the vcpu struct and the kvmppc_vcore struct. The fields in the kvmppc_vcore struct are protected by the vcpu->arch.tbacct_lock of the vcpu that has taken responsibility for running the virtual core. This works correctly but confuses lockdep, because it sees that the code takes the tbacct_lock for a vcpu in kvmppc_remove_runnable() and then takes another vcpu's tbacct_lock in vcore_stolen_time(), and it thinks there is a possibility of deadlock, causing it to print reports like this: ============================================= [ INFO: possible recursive locking detected ] 3.18.0-rc7-kvm-00016-g8db4bc6 #89 Not tainted --------------------------------------------- qemu-system-ppc/6188 is trying to acquire lock: (&(&vcpu->arch.tbacct_lock)->rlock){......}, at: [<d00000000ecb1fe8>] .vcore_stolen_time+0x48/0xd0 [kvm_hv] but task is already holding lock: (&(&vcpu->arch.tbacct_lock)->rlock){......}, at: [<d00000000ecb25a0>] .kvmppc_remove_runnable.part.3+0x30/0xd0 [kvm_hv] other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&(&vcpu->arch.tbacct_lock)->rlock); lock(&(&vcpu->arch.tbacct_lock)->rlock); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by qemu-system-ppc/6188: #0: (&vcpu->mutex){+.+.+.}, at: [<d00000000eb93f98>] .vcpu_load+0x28/0xe0 [kvm] #1: (&(&vcore->lock)->rlock){+.+...}, at: [<d00000000ecb41b0>] .kvmppc_vcpu_run_hv+0x530/0x1530 [kvm_hv] #2: (&(&vcpu->arch.tbacct_lock)->rlock){......}, at: [<d00000000ecb25a0>] .kvmppc_remove_runnable.part.3+0x30/0xd0 [kvm_hv] stack backtrace: CPU: 40 PID: 6188 Comm: qemu-system-ppc Not tainted 3.18.0-rc7-kvm-00016-g8db4bc6 #89 Call Trace: [c000000b2754f3f0] [c000000000b31b6c] .dump_stack+0x88/0xb4 (unreliable) [c000000b2754f470] [c0000000000faeb8] .__lock_acquire+0x1878/0x2190 [c000000b2754f600] [c0000000000fbf0c] .lock_acquire+0xcc/0x1a0 [c000000b2754f6d0] [c000000000b2954c] ._raw_spin_lock_irq+0x4c/0x70 [c000000b2754f760] [d00000000ecb1fe8] .vcore_stolen_time+0x48/0xd0 [kvm_hv] [c000000b2754f7f0] [d00000000ecb25b4] .kvmppc_remove_runnable.part.3+0x44/0xd0 [kvm_hv] [c000000b2754f880] [d00000000ecb43ec] .kvmppc_vcpu_run_hv+0x76c/0x1530 [kvm_hv] [c000000b2754f9f0] [d00000000eb9f46c] .kvmppc_vcpu_run+0x2c/0x40 [kvm] [c000000b2754fa60] [d00000000eb9c9a4] .kvm_arch_vcpu_ioctl_run+0x54/0x160 [kvm] [c000000b2754faf0] [d00000000eb94538] .kvm_vcpu_ioctl+0x498/0x760 [kvm] [c000000b2754fcb0] [c000000000267eb4] .do_vfs_ioctl+0x444/0x770 [c000000b2754fd90] [c0000000002682a4] .SyS_ioctl+0xc4/0xe0 [c000000b2754fe30] [c0000000000092e4] syscall_exit+0x0/0x98 In order to make the locking easier to analyse, we change the code to use a spinlock in the kvmppc_vcore struct to protect the stolen_tb and preempt_tb fields. This lock needs to be an irq-safe lock since it is used in the kvmppc_core_vcpu_load_hv() and kvmppc_core_vcpu_put_hv() functions, which are called with the scheduler rq lock held, which is an irq-safe lock. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de> |
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Paul Mackerras
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d506735b1a |
KVM: PPC: Book3S HV: Fix computation of tlbie operand
The B (segment size) field in the RB operand for the tlbie instruction is two bits, which we get from the top two bits of the first doubleword of the HPT entry to be invalidated. These bits go in bits 8 and 9 of the RB operand (bits 54 and 55 in IBM bit numbering). The compute_tlbie_rb() function gets these bits as v >> (62 - 8), which is not correct as it will bring in the top 10 bits, not just the top two. These extra bits could corrupt the AP, AVAL and L fields in the RB value. To fix this we shift right 62 bits and then shift left 8 bits, so we only get the two bits of the B field. The first doubleword of the HPT entry is under the control of the guest kernel. In fact, Linux guests will always put zeroes in bits 54 -- 61 (IBM bits 2 -- 9), but we should not rely on guests doing this. Signed-off-by: Paul Mackerras <paulus@samba.org> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Alexander Graf <agraf@suse.de> |
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Shreyas B. Prabhu
|
77b54e9f21 |
powernv/powerpc: Add winkle support for offline cpus
Winkle is a deep idle state supported in power8 chips. A core enters winkle when all the threads of the core enter winkle. In this state power supply to the entire chiplet i.e core, private L2 and private L3 is turned off. As a result it gives higher powersavings compared to sleep. But entering winkle results in a total hypervisor state loss. Hence the hypervisor context has to be preserved before entering winkle and restored upon wake up. Power-on Reset Engine (PORE) is a dedicated engine which is responsible for powering on the chiplet during wake up. It can be programmed to restore the register contests of a few specific registers. This patch uses PORE to restore register state wherever possible and uses stack to save and restore rest of the necessary registers. With hypervisor state restore things fall under three categories- per-core state, per-subcore state and per-thread state. To manage this, extend the infrastructure introduced for sleep. Mainly we add a paca variable subcore_sibling_mask. Using this and the core_idle_state we can distingush first thread in core and subcore. Signed-off-by: Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Shreyas B. Prabhu
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7cba160ad7 |
powernv/cpuidle: Redesign idle states management
Deep idle states like sleep and winkle are per core idle states. A core enters these states only when all the threads enter either the particular idle state or a deeper one. There are tasks like fastsleep hardware bug workaround and hypervisor core state save which have to be done only by the last thread of the core entering deep idle state and similarly tasks like timebase resync, hypervisor core register restore that have to be done only by the first thread waking up from these state. The current idle state management does not have a way to distinguish the first/last thread of the core waking/entering idle states. Tasks like timebase resync are done for all the threads. This is not only is suboptimal, but can cause functionality issues when subcores and kvm is involved. This patch adds the necessary infrastructure to track idle states of threads in a per-core structure. It uses this info to perform tasks like fastsleep workaround and timebase resync only once per core. Signed-off-by: Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com> Originally-by: Preeti U. Murthy <preeti@linux.vnet.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: linux-pm@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Shreyas B. Prabhu
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8eb8ac89a3 |
powerpc/powernv: Enable Offline CPUs to enter deep idle states
The secondary threads should enter deep idle states so as to gain maximum powersavings when the entire core is offline. To do so the offline path must be made aware of the available deepest idle state. Hence probe the device tree for the possible idle states in powernv core code and expose the deepest idle state through flags. Since the device tree is probed by the cpuidle driver as well, move the parameters required to discover the idle states into an appropriate common place to both the driver and the powernv core code. Another point is that fastsleep idle state may require workarounds in the kernel to function properly. This workaround is introduced in the subsequent patches. However neither the cpuidle driver or the hotplug path need be bothered about this workaround. They will be taken care of by the core powernv code. Originally-by: Srivatsa S. Bhat <srivatsa@mit.edu> Signed-off-by: Preeti U. Murthy <preeti@linux.vnet.ibm.com> Signed-off-by: Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com> Reviewed-by: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: linux-pm@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Paul Mackerras
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8117ac6a6c |
powerpc/powernv: Switch off MMU before entering nap/sleep/rvwinkle mode
Currently, when going idle, we set the flag indicating that we are in nap mode (paca->kvm_hstate.hwthread_state) and then execute the nap (or sleep or rvwinkle) instruction, all with the MMU on. This is bad for two reasons: (a) the architecture specifies that those instructions must be executed with the MMU off, and in fact with only the SF, HV, ME and possibly RI bits set, and (b) this introduces a race, because as soon as we set the flag, another thread can switch the MMU to a guest context. If the race is lost, this thread will typically start looping on relocation-on ISIs at 0xc...4400. This fixes it by setting the MSR as required by the architecture before setting the flag or executing the nap/sleep/rvwinkle instruction. Cc: stable@vger.kernel.org [ shreyas@linux.vnet.ibm.com: Edited to handle LE ] Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Neelesh Gupta
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470834508f |
i2c: Driver to expose PowerNV platform i2c busses
The patch exposes the available i2c busses on the PowerNV platform to the kernel and implements the bus driver to support i2c and smbus commands. The driver uses the platform device infrastructure to probe the busses on the platform and registers them with the i2c driver framework. Signed-off-by: Neelesh Gupta <neelegup@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Wolfram Sang <wsa@the-dreams.de> (I2C part, excluding the bindings) Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Linus Torvalds
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f96fe22567 |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Pull another networking update from David Miller:
"Small follow-up to the main merge pull from the other day:
1) Alexander Duyck's DMA memory barrier patch set.
2) cxgb4 driver fixes from Karen Xie.
3) Add missing export of fixed_phy_register() to modules, from Mark
Salter.
4) DSA bug fixes from Florian Fainelli"
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (24 commits)
net/macb: add TX multiqueue support for gem
linux/interrupt.h: remove the definition of unused tasklet_hi_enable
jme: replace calls to redundant function
net: ethernet: davicom: Allow to select DM9000 for nios2
net: ethernet: smsc: Allow to select SMC91X for nios2
cxgb4: Add support for QSA modules
libcxgbi: fix freeing skb prematurely
cxgb4i: use set_wr_txq() to set tx queues
cxgb4i: handle non-pdu-aligned rx data
cxgb4i: additional types of negative advice
cxgb4/cxgb4i: set the max. pdu length in firmware
cxgb4i: fix credit check for tx_data_wr
cxgb4i: fix tx immediate data credit check
net: phy: export fixed_phy_register()
fib_trie: Fix trie balancing issue if new node pushes down existing node
vlan: Add ability to always enable TSO/UFO
r8169:update rtl8168g pcie ephy parameter
net: dsa: bcm_sf2: force link for all fixed PHY devices
fm10k/igb/ixgbe: Use dma_rmb on Rx descriptor reads
r8169: Use dma_rmb() and dma_wmb() for DescOwn checks
...
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Richard Guy Briggs
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63f13448d8 |
powerpc: add little endian flag to syscall_get_arch()
Since both ppc and ppc64 have LE variants which are now reported by uname, add
that flag (__AUDIT_ARCH_LE) to syscall_get_arch() and add AUDIT_ARCH_PPC64LE
variant.
Without this, perf trace and auditctl fail.
Mainline kernel reports ppc64le (per
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Alexander Duyck
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1077fa36f2 |
arch: Add lightweight memory barriers dma_rmb() and dma_wmb()
There are a number of situations where the mandatory barriers rmb() and wmb() are used to order memory/memory operations in the device drivers and those barriers are much heavier than they actually need to be. For example in the case of PowerPC wmb() calls the heavy-weight sync instruction when for coherent memory operations all that is really needed is an lsync or eieio instruction. This commit adds a coherent only version of the mandatory memory barriers rmb() and wmb(). In most cases this should result in the barrier being the same as the SMP barriers for the SMP case, however in some cases we use a barrier that is somewhere in between rmb() and smp_rmb(). For example on ARM the rmb barriers break down as follows: Barrier Call Explanation --------- -------- ---------------------------------- rmb() dsb() Data synchronization barrier - system dma_rmb() dmb(osh) data memory barrier - outer sharable smp_rmb() dmb(ish) data memory barrier - inner sharable These new barriers are not as safe as the standard rmb() and wmb(). Specifically they do not guarantee ordering between coherent and incoherent memories. The primary use case for these would be to enforce ordering of reads and writes when accessing coherent memory that is shared between the CPU and a device. It may also be noted that there is no dma_mb(). Most architectures don't provide a good mechanism for performing a coherent only full barrier without resorting to the same mechanism used in mb(). As such there isn't much to be gained in trying to define such a function. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Michael Ellerman <michael@ellerman.id.au> Cc: Michael Neuling <mikey@neuling.org> Cc: Russell King <linux@arm.linux.org.uk> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: David Miller <davem@davemloft.net> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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Alexander Duyck
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8a44971841 |
arch: Cleanup read_barrier_depends() and comments
This patch is meant to cleanup the handling of read_barrier_depends and
smp_read_barrier_depends. In multiple spots in the kernel headers
read_barrier_depends is defined as "do {} while (0)", however we then go
into the SMP vs non-SMP sections and have the SMP version reference
read_barrier_depends, and the non-SMP define it as yet another empty
do/while.
With this commit I went through and cleaned out the duplicate definitions
and reduced the number of definitions down to 2 per header. In addition I
moved the 50 line comments for the macro from the x86 and mips headers that
defined it as an empty do/while to those that were actually defining the
macro, alpha and blackfin.
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Linus Torvalds
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140cd7fb04 |
powerpc updates for 3.19
Some nice cleanups like removing bootmem, and removal of __get_cpu_var(). There is one patch to mm/gup.c. This is the generic GUP implementation, but is only used by us and arm(64). We have an ack from Steve Capper, and although we didn't get an ack from Andrew he told us to take the patch through the powerpc tree. There's one cxl patch. This is in drivers/misc, but Greg said he was happy for us to manage fixes for it. There is an infrastructure patch to support an IPMI driver for OPAL. That patch also appears in Corey Minyard's IPMI tree, you may see a conflict there. There is also an RTC driver for OPAL. We weren't able to get any response from the RTC maintainer, Alessandro Zummo, so in the end we just merged the driver. The usual batch of Freescale updates from Scott. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJUiSTSAAoJEFHr6jzI4aWAirQP/3rIEng0LzLu5kW2zkGylIaM SNDum1vze3mHiTFl+CFcSIGpC1UEULoB49HA+2oE/ExKpIceG6lpL2LP+wNh2FW5 mozjMjS6mZt4w1Fu1D2ZtgQc3O1T1pxkqsnZmPa8gVf5k5d5IQNPY6yB0pgVWwbV gwBKxe4VwPAzJjppE9i9MDhNTJwmHZq0lI8XuoTXOOU/f+4G1WxmjrbyveQ7cRP5 i/sq2cKjxpWA+KDeIXo0GR0DpXR7qMeAvFX5xXY7oKuUJIFDM4kSHfmMYP6qLf5c 2vlsJqHVqfOgQdve41z1ooaPzNtg7ezVo+VqqguSgtSgwy2JUo/uHpnzz3gD1Olo AP5+6xj8LZac0rTPxF4n4Hoyrp7AaaFjEFt1zqT9PWniZW4B41wtia0QORBNUf1S UEmKAC9T3WZJ47mH7WMSadtOPF9E3Yd/zuiPD4udtptCNKPbr6/k1MpJPIW2D4Rn BJ0QZTRd7V0yRofXxZtHxaMxq8pWd/Tip7J/zr/ghz+ulnH8BuFamuhCCLuJlESU +A2PMfuseyTMpH9sMAmmTwSGPDKjaUFWvmFvY/n88NZL7r2LlomNrDWFSSQOIHUP FxjYmjUMpZeexsfyRdgFV/INhYC3o3cso2fRGO45YK6nkxNnjNFEBS6WhQLvNLBu sknd1WjXkuJtoMC15SrQ =jvyT -----END PGP SIGNATURE----- Merge tag 'powerpc-3.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux Pull powerpc updates from Michael Ellerman: "Some nice cleanups like removing bootmem, and removal of __get_cpu_var(). There is one patch to mm/gup.c. This is the generic GUP implementation, but is only used by us and arm(64). We have an ack from Steve Capper, and although we didn't get an ack from Andrew he told us to take the patch through the powerpc tree. There's one cxl patch. This is in drivers/misc, but Greg said he was happy for us to manage fixes for it. There is an infrastructure patch to support an IPMI driver for OPAL. There is also an RTC driver for OPAL. We weren't able to get any response from the RTC maintainer, Alessandro Zummo, so in the end we just merged the driver. The usual batch of Freescale updates from Scott" * tag 'powerpc-3.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux: (101 commits) powerpc/powernv: Return to cpu offline loop when finished in KVM guest powerpc/book3s: Fix partial invalidation of TLBs in MCE code. powerpc/mm: don't do tlbie for updatepp request with NO HPTE fault powerpc/xmon: Cleanup the breakpoint flags powerpc/xmon: Enable HW instruction breakpoint on POWER8 powerpc/mm/thp: Use tlbiel if possible powerpc/mm/thp: Remove code duplication powerpc/mm/hugetlb: Sanity check gigantic hugepage count powerpc/oprofile: Disable pagefaults during user stack read powerpc/mm: Check for matching hpte without taking hpte lock powerpc: Drop useless warning in eeh_init() powerpc/powernv: Cleanup unused MCE definitions/declarations. powerpc/eeh: Dump PHB diag-data early powerpc/eeh: Recover EEH error on ownership change for BCM5719 powerpc/eeh: Set EEH_PE_RESET on PE reset powerpc/eeh: Refactor eeh_reset_pe() powerpc: Remove more traces of bootmem powerpc/pseries: Initialise nvram_pstore_info's buf_lock cxl: Name interrupts in /proc/interrupt cxl: Return error to PSL if IRQ demultiplexing fails & print clearer warning ... |
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Linus Torvalds
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70e71ca0af |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
Pull networking updates from David Miller:
1) New offloading infrastructure and example 'rocker' driver for
offloading of switching and routing to hardware.
This work was done by a large group of dedicated individuals, not
limited to: Scott Feldman, Jiri Pirko, Thomas Graf, John Fastabend,
Jamal Hadi Salim, Andy Gospodarek, Florian Fainelli, Roopa Prabhu
2) Start making the networking operate on IOV iterators instead of
modifying iov objects in-situ during transfers. Thanks to Al Viro
and Herbert Xu.
3) A set of new netlink interfaces for the TIPC stack, from Richard
Alpe.
4) Remove unnecessary looping during ipv6 routing lookups, from Martin
KaFai Lau.
5) Add PAUSE frame generation support to gianfar driver, from Matei
Pavaluca.
6) Allow for larger reordering levels in TCP, which are easily
achievable in the real world right now, from Eric Dumazet.
7) Add a variable of napi_schedule that doesn't need to disable cpu
interrupts, from Eric Dumazet.
8) Use a doubly linked list to optimize neigh_parms_release(), from
Nicolas Dichtel.
9) Various enhancements to the kernel BPF verifier, and allow eBPF
programs to actually be attached to sockets. From Alexei
Starovoitov.
10) Support TSO/LSO in sunvnet driver, from David L Stevens.
11) Allow controlling ECN usage via routing metrics, from Florian
Westphal.
12) Remote checksum offload, from Tom Herbert.
13) Add split-header receive, BQL, and xmit_more support to amd-xgbe
driver, from Thomas Lendacky.
14) Add MPLS support to openvswitch, from Simon Horman.
15) Support wildcard tunnel endpoints in ipv6 tunnels, from Steffen
Klassert.
16) Do gro flushes on a per-device basis using a timer, from Eric
Dumazet. This tries to resolve the conflicting goals between the
desired handling of bulk vs. RPC-like traffic.
17) Allow userspace to ask for the CPU upon what a packet was
received/steered, via SO_INCOMING_CPU. From Eric Dumazet.
18) Limit GSO packets to half the current congestion window, from Eric
Dumazet.
19) Add a generic helper so that all drivers set their RSS keys in a
consistent way, from Eric Dumazet.
20) Add xmit_more support to enic driver, from Govindarajulu
Varadarajan.
21) Add VLAN packet scheduler action, from Jiri Pirko.
22) Support configurable RSS hash functions via ethtool, from Eyal
Perry.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1820 commits)
Fix race condition between vxlan_sock_add and vxlan_sock_release
net/macb: fix compilation warning for print_hex_dump() called with skb->mac_header
net/mlx4: Add support for A0 steering
net/mlx4: Refactor QUERY_PORT
net/mlx4_core: Add explicit error message when rule doesn't meet configuration
net/mlx4: Add A0 hybrid steering
net/mlx4: Add mlx4_bitmap zone allocator
net/mlx4: Add a check if there are too many reserved QPs
net/mlx4: Change QP allocation scheme
net/mlx4_core: Use tasklet for user-space CQ completion events
net/mlx4_core: Mask out host side virtualization features for guests
net/mlx4_en: Set csum level for encapsulated packets
be2net: Export tunnel offloads only when a VxLAN tunnel is created
gianfar: Fix dma check map error when DMA_API_DEBUG is enabled
cxgb4/csiostor: Don't use MASTER_MUST for fw_hello call
net: fec: only enable mdio interrupt before phy device link up
net: fec: clear all interrupt events to support i.MX6SX
net: fec: reset fep link status in suspend function
net: sock: fix access via invalid file descriptor
net: introduce helper macro for_each_cmsghdr
...
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Kirill A. Shutemov
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c164e038ee |
mm: fix huge zero page accounting in smaps report
As a small zero page, huge zero page should not be accounted in smaps report as normal page. For small pages we rely on vm_normal_page() to filter out zero page, but vm_normal_page() is not designed to handle pmds. We only get here due hackish cast pmd to pte in smaps_pte_range() -- pte and pmd format is not necessary compatible on each and every architecture. Let's add separate codepath to handle pmds. follow_trans_huge_pmd() will detect huge zero page for us. We would need pmd_dirty() helper to do this properly. The patch adds it to THP-enabled architectures which don't yet have one. [akpm@linux-foundation.org: use do_div to fix 32-bit build] Signed-off-by: "Kirill A. Shutemov" <kirill@shutemov.name> Reported-by: Fengguang Wu <fengguang.wu@intel.com> Tested-by: Fengwei Yin <yfw.kernel@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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Daniel Borkmann
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0cb6c969ed |
net, lib: kill arch_fast_hash library bits
As there are now no remaining users of arch_fast_hash(), lets kill it entirely. This basically reverts commit |
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Linus Torvalds
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a0e4467726 |
asm-generic: asm/io.h rewrite
While there normally is no reason to have a pull request for asm-generic
but have all changes get merged through whichever tree needs them, I do
have a series for 3.19. There are two sets of patches that change
significant portions of asm/io.h, and this branch contains both in order
to resolve the conflicts:
- Will Deacon has done a set of patches to ensure that all architectures
define {read,write}{b,w,l,q}_relaxed() functions or get them by
including asm-generic/io.h. These functions are commonly used on ARM
specific drivers to avoid expensive L2 cache synchronization implied by
the normal {read,write}{b,w,l,q}, but we need to define them on all
architectures in order to share the drivers across architectures and
to enable CONFIG_COMPILE_TEST configurations for them
- Thierry Reding has done an unrelated set of patches that extends
the asm-generic/io.h file to the degree necessary to make it useful
on ARM64 and potentially other architectures.
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Merge tag 'asm-generic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic
Pull asm-generic asm/io.h rewrite from Arnd Bergmann:
"While there normally is no reason to have a pull request for
asm-generic but have all changes get merged through whichever tree
needs them, I do have a series for 3.19.
There are two sets of patches that change significant portions of
asm/io.h, and this branch contains both in order to resolve the
conflicts:
- Will Deacon has done a set of patches to ensure that all
architectures define {read,write}{b,w,l,q}_relaxed() functions or
get them by including asm-generic/io.h.
These functions are commonly used on ARM specific drivers to avoid
expensive L2 cache synchronization implied by the normal
{read,write}{b,w,l,q}, but we need to define them on all
architectures in order to share the drivers across architectures
and to enable CONFIG_COMPILE_TEST configurations for them
- Thierry Reding has done an unrelated set of patches that extends
the asm-generic/io.h file to the degree necessary to make it useful
on ARM64 and potentially other architectures"
* tag 'asm-generic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: (29 commits)
ARM64: use GENERIC_PCI_IOMAP
sparc: io: remove duplicate relaxed accessors on sparc32
ARM: sa11x0: Use void __iomem * in MMIO accessors
arm64: Use include/asm-generic/io.h
ARM: Use include/asm-generic/io.h
asm-generic/io.h: Implement generic {read,write}s*()
asm-generic/io.h: Reconcile I/O accessor overrides
/dev/mem: Use more consistent data types
Change xlate_dev_{kmem,mem}_ptr() prototypes
ARM: ixp4xx: Properly override I/O accessors
ARM: ixp4xx: Fix build with IXP4XX_INDIRECT_PCI
ARM: ebsa110: Properly override I/O accessors
ARC: Remove redundant PCI_IOBASE declaration
documentation: memory-barriers: clarify relaxed io accessor semantics
x86: io: implement dummy relaxed accessor macros for writes
tile: io: implement dummy relaxed accessor macros for writes
sparc: io: implement dummy relaxed accessor macros for writes
powerpc: io: implement dummy relaxed accessor macros for writes
parisc: io: implement dummy relaxed accessor macros for writes
mn10300: io: implement dummy relaxed accessor macros for writes
...
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Linus Torvalds
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3a647c1d7a |
ARM: SoC driver updates for 3.19
These are changes for drivers that are intimately tied to some SoC
and for some reason could not get merged through the respective
subsystem maintainer tree.
The largest single change here this time around is the Tegra
iommu/memory controller driver, which gets updated to the new
iommu DT binding. More drivers like this are likely to follow
for the following merge window, but we should be able to do
those through the iommu maintainer.
Other notable changes are:
* reset controller drivers from the reset maintainer (socfpga, sti, berlin)
* fixes for the keystone navigator driver merged last time
* at91 rtc driver changes related to the at91 cleanups
* ARM perf driver changes from Will Deacon
* updates for the brcmstb_gisb driver
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Merge tag 'drivers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC driver updates from Arnd Bergmann:
"These are changes for drivers that are intimately tied to some SoC and
for some reason could not get merged through the respective subsystem
maintainer tree.
The largest single change here this time around is the Tegra
iommu/memory controller driver, which gets updated to the new iommu DT
binding. More drivers like this are likely to follow for the
following merge window, but we should be able to do those through the
iommu maintainer.
Other notable changes are:
- reset controller drivers from the reset maintainer (socfpga, sti,
berlin)
- fixes for the keystone navigator driver merged last time
- at91 rtc driver changes related to the at91 cleanups
- ARM perf driver changes from Will Deacon
- updates for the brcmstb_gisb driver"
* tag 'drivers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (53 commits)
clocksource: arch_timer: Allow the device tree to specify uninitialized timer registers
clocksource: arch_timer: Fix code to use physical timers when requested
memory: Add NVIDIA Tegra memory controller support
bus: brcmstb_gisb: Add register offset tables for older chips
bus: brcmstb_gisb: Look up register offsets in a table
bus: brcmstb_gisb: Introduce wrapper functions for MMIO accesses
bus: brcmstb_gisb: Make the driver buildable on MIPS
of: Add NVIDIA Tegra memory controller binding
ARM: tegra: Move AHB Kconfig to drivers/amba
amba: Add Kconfig file
clk: tegra: Implement memory-controller clock
serial: samsung: Fix serial config dependencies for exynos7
bus: brcmstb_gisb: resolve section mismatch
ARM: common: edma: edma_pm_resume may be unused
ARM: common: edma: add suspend resume hook
powerpc/iommu: Rename iommu_[un]map_sg functions
rtc: at91sam9: add DT bindings documentation
rtc: at91sam9: use clk API instead of relying on AT91_SLOW_CLOCK
ARM: at91: add clk_lookup entry for RTT devices
rtc: at91sam9: rework the Kconfig description
...
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