- 02 May, 2013 2 commits
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Anshuman Khandual authored
Make BHRB instructions available in problem and privileged states. Signed-off-by:
Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by:
Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Bharat Bhushan authored
We do not want to take single step and branch-taken debug exception in kernel exception code. But the address range check was not covering all kernel exception handlers address range. With this patch we defined the interrupt_end label which defines the end on kernel exception code. So now we check interrupt_base to interrupt_end range for not handling debug exception in kernel exception entry. Signed-off-by:
Bharat Bhushan <bharat.bhushan@freescale.com> Signed-off-by:
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- 30 Apr, 2013 24 commits
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Aneesh Kumar K.V authored
Encode the actual page correctly in tlbie/tlbiel. This make sure we handle multiple page size segment correctly. Signed-off-by:
Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by:
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Aneesh Kumar K.V authored
This gives hint about different base and actual page size combination supported by the platform. Signed-off-by:
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Aneesh Kumar K.V authored
Reviewed-by:
David Gibson <david@gibson.dropbear.id.au> Signed-off-by:
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Aneesh Kumar K.V authored
As per ISA doc, we encode base and actual page size in the LP bits of PTE. The number of bit used to encode the page sizes depend on actual page size. ISA doc lists this as PTE LP actual page size rrrr rrrz >=8KB rrrr rrzz >=16KB rrrr rzzz >=32KB rrrr zzzz >=64KB rrrz zzzz >=128KB rrzz zzzz >=256KB rzzz zzzz >=512KB zzzz zzzz >=1MB ISA doc also says "The values of the “z” bits used to specify each size, along with all possible values of “r” bits in the LP field, must result in LP values distinct from other LP values for other sizes." based on the above update hpte_decode to use the correct decoding for LP bits. Reviewed-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
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Aneesh Kumar K.V authored
We look at both the segment base page size and actual page size and store the pte-lp-encodings in an array per base page size. We also update all relevant functions to take actual page size argument so that we can use the correct PTE LP encoding in HPTE. This should also get the basic Multiple Page Size per Segment (MPSS) support. This is needed to enable THP on ppc64. [Fixed PR KVM build --BenH] Signed-off-by:
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Aneesh Kumar K.V authored
In all these cases we are doing something similar to HPTE_V_COMPARE(hpte_v, want_v) which ignores the HPTE_V_LARGE bit With MPSS support we would need actual page size to set HPTE_V_LARGE bit and that won't be available in most of these cases. Since we are ignoring HPTE_V_LARGE bit, use the avpn value instead. There should not be any change in behaviour after this patch. Acked-by:
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Aneesh Kumar K.V authored
We allocate one page for the last level of linux page table. With THP and large page size of 16MB, that would mean we are wasting large part of that page. To map 16MB area, we only need a PTE space of 2K with 64K page size. This patch reduce the space wastage by sharing the page allocated for the last level of linux page table with multiple pmd entries. We call these smaller chunks PTE page fragments and allocated page, PTE page. In order to support systems which doesn't have 64K HPTE support, we also add another 2K to PTE page fragment. The second half of the PTE fragments is used for storing slot and secondary bit information of an HPTE. With this we now have a 4K PTE fragment. We use a simple approach to share the PTE page. On allocation, we bump the PTE page refcount to 16 and share the PTE page with the next 16 pte alloc request. This should help in the node locality of the PTE page fragment, assuming that the immediate pte alloc request will mostly come from the same NUMA node. We don't try to reuse the freed PTE page fragment. Hence we could be waisting some space. Signed-off-by:
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Aneesh Kumar K.V authored
Acked-by:
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Aneesh Kumar K.V authored
This make one PMD cover 16MB range. That helps in easier implementation of THP on power. THP core code make use of one pmd entry to track the hugepage and the range mapped by a single pmd entry should be equal to the hugepage size supported by the hardware. This also switch PGD to cover 16GB. That is needed so that we can simplify the hugetlb page walking code so that we have same pte format for explicit hugepage and THP hugepage. Signed-off-by:
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Aneesh Kumar K.V authored
We will be switching PMD_SHIFT to 24 bits to facilitate THP impmenetation. With PMD_SHIFT set to 24, we now have 16MB huge pages allocated at PGD level. That means with 32 bit process we cannot allocate normal pages at all, because we cover the entire address space with one pgd entry. Fix this by switching to a new page table format for hugepages. With the new page table format for 16GB and 16MB hugepages we won't allocate hugepage directory. Instead we encode the PTE information directly at the directory level. This forces 16MB hugepage at PMD level. This will also make the page take walk much simpler later when we add the THP support. With the new table format we have 4 cases for pgds and pmds: (1) invalid (all zeroes) (2) pointer to next table, as normal; bottom 6 bits == 0 (3) leaf pte for huge page, bottom two bits != 00 (4) hugepd pointer, bottom two bits == 00, next 4 bits indicate size of table Signed-off-by:
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Aneesh Kumar K.V authored
Change the hugepage directory format so that we can have leaf ptes directly at page directory avoiding the allocation of hugepage directory. With the new table format we have 3 cases for pgds and pmds: (1) invalid (all zeroes) (2) pointer to next table, as normal; bottom 6 bits == 0 (4) hugepd pointer, bottom two bits == 00, next 4 bits indicate size of table Instead of storing shift value in hugepd pointer we use mmu_psize_def index so that we can fit all the supported hugepage size in 4 bits Signed-off-by:
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Aneesh Kumar K.V authored
With PGD_INDEX_SIZE set to 12 the existing macro doesn't work. Fix it to use PTRS_PER_PGD The idea originally was to have one more bit in the result of pgd_index() than PGD_INDEX_SIZE, so that if one had an address corresponding to the last PGD entry, and then incremented that address by PGD_SIZE, and took pgd_index() of that, you wouldn't end up with zero. The commit that introduced that dates back to 2002, and the code that was sensitive to that edge case has long since been refactored (several times), so there is no need for it these days. Signed-off-by:
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Aneesh Kumar K.V authored
USE PTRS_PER_PTE to indicate the size of pte page. To support THP, later patches will be changing PTRS_PER_PTE value. Acked-by:
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Aneesh Kumar K.V authored
We were not saving DAR and DSISR on MCE. Save then and also print the values along with exception details in xmon. Acked-by:
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Aneesh Kumar K.V authored
PAPR defines these errors as negative values. So print them accordingly for easy debugging. Acked-by:
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Nathan Fontenot authored
Correct build failure for powerpc/pseries builds with CONFIG_SMP not defined. The function cpu_sibling_mask has no meaning (or definition) when CONFIG_SMP is not defined. Additionally, the updating of NUMA affinity for a CPU in a UP system doesn't really make sense. This patch ifdef's out the code making the affinity updates for PRRN events to fix the following build break. arch/powerpc/mm/numa.c: In function ‘stage_topology_update’: arch/powerpc/mm/numa.c:1535: error: implicit declaration of function ‘cpu_sibling_mask’ arch/powerpc/mm/numa.c:1535: warning: passing argument 3 of ‘cpumask_or’ makes pointer from integer without a cast make[1]: *** [arch/powerpc/mm/numa.o] Error 1 Signed-off-by:
Nathan Fontenot <nfont@linux.vnet.ibm.com> Signed-off-by:
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Kevin Hao authored
This is stale and not used by anyone now. Signed-off-by:
Kevin Hao <haokexin@gmail.com> Signed-off-by:
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Vasant Hegde authored
We use kmem_cache_alloc() to allocate memory to hold the new firmware which will be flashed. kmem_cache_alloc() calls rtas_block_ctor() to set memory to NULL. But these constructor is called only for newly allocated slabs. If we run below command multiple time without rebooting, allocator may allocate memory from the area which was free'd by kmem_cache_free and it will not call constructor. In this situation we may hit kernel oops. dd if=<fw image> of=/proc/ppc64/rtas/firmware_flash bs=4096 oops message: ------------- [ 1602.399755] Oops: Kernel access of bad area, sig: 11 [#1] [ 1602.399772] SMP NR_CPUS=1024 NUMA pSeries [ 1602.399779] Modules linked in: rtas_flash nfsd lockd auth_rpcgss nfs_acl sunrpc fuse loop dm_mod sg ipv6 ses enclosure ehea ehci_pci ohci_hcd ehci_hcd usbcore sd_mod usb_common crc_t10dif scsi_dh_alua scsi_dh_emc scsi_dh_hp_sw scsi_dh_rdac scsi_dh ipr libata scsi_mod [ 1602.399817] NIP: d00000000a170b9c LR: d00000000a170b64 CTR: c00000000079cd58 [ 1602.399823] REGS: c0000003b9937930 TRAP: 0300 Not tainted (3.9.0-rc4-0.27-ppc64) [ 1602.399828] MSR: 8000000000009032 <SF,EE,ME,IR,DR,RI> CR: 22000428 XER: 20000000 [ 1602.399841] SOFTE: 1 [ 1602.399844] CFAR: c000000000005f24 [ 1602.399848] DAR: 8c2625a820631fef, DSISR: 40000000 [ 1602.399852] TASK = c0000003b4520760[3655] 'dd' THREAD: c0000003b9934000 CPU: 3 GPR00: 8c2625a820631fe7 c0000003b9937bb0 d00000000a179f28 d00000000a171f08 GPR04: 0000000010040000 0000000000001000 c0000003b9937df0 c0000003b5fb2080 GPR08: c0000003b58f7200 d00000000a179f28 c0000003b40058d4 c00000000079cd58 GPR12: d00000000a171450 c000000007f40900 0000000000000005 0000000010178d20 GPR16: 00000000100cb9d8 000000000000001d 0000000000000000 000000001003ffff GPR20: 0000000000000001 0000000000000000 00003fffa0b50d30 000000001001f010 GPR24: 0000000010020888 0000000010040000 d00000000a171f08 d00000000a172808 GPR28: 0000000000001000 0000000010040000 c0000003b4005880 8c2625a820631fe7 [ 1602.399924] NIP [d00000000a170b9c] .rtas_flash_write+0x7c/0x1e8 [rtas_flash] [ 1602.399930] LR [d00000000a170b64] .rtas_flash_write+0x44/0x1e8 [rtas_flash] [ 1602.399934] Call Trace: [ 1602.399939] [c0000003b9937bb0] [d00000000a170b64] .rtas_flash_write+0x44/0x1e8 [rtas_flash] (unreliable) [ 1602.399948] [c0000003b9937c60] [c000000000282830] .proc_reg_write+0x90/0xe0 [ 1602.399955] [c0000003b9937ce0] [c0000000001ff374] .vfs_write+0x114/0x238 [ 1602.399961] [c0000003b9937d80] [c0000000001ff5d8] .SyS_write+0x70/0xe8 [ 1602.399968] [c0000003b9937e30] [c000000000009cdc] syscall_exit+0x0/0xa0 [ 1602.399973] Instruction dump: [ 1602.399977] eb698010 801b0028 2f80dcd6 419e00a4 2fbc0000 419e009c ebfb0030 2fbf0000 [ 1602.399989] 409e0010 480000d8 60000000 7c1f0378 <e81f0008> 2fa00000 409efff4 e81f0000 [ 1602.400012] ---[ end trace b4136d115dc31dac ]--- [ 1602.402178] [ 1602.402185] Sending IPI to other CPUs [ 1602.403329] IPI complete This patch uses kmem_cache_zalloc() instead of kmem_cache_alloc() to allocate memory, which makes sure memory is set to 0 before using. Also removes rtas_block_ctor(), which is no longer required. Signed-off-by:
Vasant Hegde <hegdevasant@linux.vnet.ibm.com> Signed-off-by:
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Stephen Rothwell authored
After merging the cgroup tree, today's linux-next build (powerpc ppc64_defconfig) failed like this: arch/powerpc/mm/numa.c: In function 'arch_update_cpu_topology': arch/powerpc/mm/numa.c:1465:2: error: implicit declaration of function 'kzalloc' [-Werror=implicit-function-declaration] arch/powerpc/mm/numa.c:1465:10: error: assignment makes pointer from integer without a cast [-Werror] arch/powerpc/mm/numa.c:1497:2: error: implicit declaration of function 'kfree' [-Werror=implicit-function-declaration] Caused by commit 30c05350 ("powerpc/pseries: Use stop machine to update cpu maps") from the powerpc tree interacting with (probably) commit ff794dea ("cpuset: remove include of cgroup.h from cpuset.h") from the cgroup tree. Removing includes from header files is fraught with danger ... The former should have added an include of linux/slab.h to arch/powerpc/mm/numa.c. I have added the following merge fix patch for today (but it should be applied to the powerpc tree ASAP). From: Stephen Rothwell <sfr@canb.auug.org.au> Date: Mon, 29 Apr 2013 14:01:44 +1000 Subject: [PATCH] powerpc: numa.c: using kzalloc/kfree requires including slab.h fixes these build errors: arch/powerpc/mm/numa.c: In function 'arch_update_cpu_topology': arch/powerpc/mm/numa.c:1465:2: error: implicit declaration of function 'kzalloc' [-Werror=implicit-function-declaration] arch/powerpc/mm/numa.c:1465:10: error: assignment makes pointer from integer without a cast [-Werror] arch/powerpc/mm/numa.c:1497:2: error: implicit declaration of function 'kfree' [-Werror=implicit-function-declaration] Signed-off-by:
Stephen Rothwell <sfr@canb.auug.org.au> Acked-by:
Tejun Heo <tj@kernel.org> Signed-off-by:
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Michael Neuling authored
Linux next is currently failing to compile mpc85xx_defconfig with: arch/powerpc/sysdev/fsl_pci.c:944:2: error: too many arguments to function 'setup_pci_atmu' This is caused by (from Kumar's next branch): commit 34642bbb Author: Kumar Gala <galak@kernel.crashing.org> powerpc/fsl-pci: Keep PCI SoC controller registers in pci_controller Which changed definition of setup_pci_atmu() but didn't update one of the callers. Below fixes this. Signed-off-by:
Michael Neuling <mikey@neuling.org> Reviewed-by:
Kim Phillips <kim.phillips@freescale.com> Signed-off-by:
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Benjamin Herrenschmidt authored
From Kumar Gala: << Add support for T4 and B4 SoC families from Freescale, e6500 altivec support, some various board fixes and other minor cleanups. >>
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Benjamin Herrenschmidt authored
From Anatolij Gustschin: << There are some changes for mpc5121 generic platform code to support mpc5125 SoC and DTS files for ac14xx and MPC5125-TWR boards. >>
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Michel Lespinasse authored
Update the powerpc slice_get_unmapped_area function to make use of vm_unmapped_area() instead of implementing a brute force search. Signed-off-by:
Michel Lespinasse <walken@google.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Tested-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
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Michel Lespinasse authored
As all other architectures have been converted to use vm_unmapped_area(), we are about to retire the free_area_cache. This change simply removes the use of that cache in slice_get_unmapped_area(), which will most certainly have a performance cost. Next one will convert that function to use the vm_unmapped_area() infrastructure and regain the performance. Signed-off-by:
Rik van Riel <riel@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by:
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- 29 Apr, 2013 3 commits
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Kevin Hao authored
The reg property in the pci bridge device node is used to bind this device node to the pci bridge device. Then all the pci devices under this bridge could use the interrupt maps defined in this device node to do the irq translation. So if this property is missed, the pci traditional irq mechanism will not work. Signed-off-by:
Kumar Gala <galak@kernel.crashing.org>
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Kevin Hao authored
In patch 34642bbb (powerpc/fsl-pci: Keep PCI SoC controller registers in pci_controller) we choose to keep the map of the PCI SoC controller registers. But we missed to delete the unmap in setup_pci_atmu function. This will cause the following call trace once we access the PCI SoC controller registers later. Unable to handle kernel paging request for data at address 0x8000080080040f14 Faulting instruction address: 0xc00000000002ea58 Oops: Kernel access of bad area, sig: 11 [#1] SMP NR_CPUS=24 T4240 QDS Modules linked in: NIP: c00000000002ea58 LR: c00000000002eaf4 CTR: c00000000002eac0 REGS: c00000017e10b4a0 TRAP: 0300 Not tainted (3.9.0-rc1-00052-gfa3529f-dirty) MSR: 0000000080029000 <CE,EE,ME> CR: 28adbe22 XER: 00000000 SOFTE: 0 DEAR: 8000080080040f14, ESR: 0000000000000000 TASK = c00000017e100000[1] 'swapper/0' THREAD: c00000017e108000 CPU: 2 GPR00: 0000000000000000 c00000017e10b720 c0000000009928d8 c00000017e578e00 GPR04: 0000000000000000 000000000000000c 0000000000000001 c00000017e10bb40 GPR08: 0000000000000000 8000080080040000 0000000000000000 0000000000000016 GPR12: 0000000088adbe22 c00000000fffa800 c000000000001ba0 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR20: 0000000000000000 0000000000000000 0000000000000000 c0000000008a5b70 GPR24: c0000000008af938 c0000000009a28d8 c0000000009bb5dc c00000017e10bb40 GPR28: c00000017e32a400 c00000017e10bc00 c00000017e32a400 c00000017e578e00 NIP [c00000000002ea58] .fsl_pcie_check_link+0x88/0xf0 LR [c00000000002eaf4] .fsl_indirect_read_config+0x34/0xb0 Call Trace: [c00000017e10b720] [c00000017e10b7a0] 0xc00000017e10b7a0 (unreliable) [c00000017e10ba30] [c00000000002eaf4] .fsl_indirect_read_config+0x34/0xb0 [c00000017e10bad0] [c00000000033aa08] .pci_bus_read_config_byte+0x88/0xd0 [c00000017e10bb90] [c00000000088d708] .pci_apply_final_quirks+0x9c/0x18c [c00000017e10bc40] [c0000000000013dc] .do_one_initcall+0x5c/0x1f0 [c00000017e10bcf0] [c00000000086ebac] .kernel_init_freeable+0x180/0x26c [c00000017e10bdb0] [c000000000001bbc] .kernel_init+0x1c/0x460 [c00000017e10be30] [c000000000000880] .ret_from_kernel_thread+0x64/0xe4 Instruction dump: 38210310 2b800015 4fdde842 7c600026 5463fffe e8010010 7c0803a6 4e800020 60000000 60000000 e92301d0 7c0004ac <80690f14> 0c030000 4c00012c 38210310 ---[ end trace 7a8fe0cbccb7d992 ]--- Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b Signed-off-by:
Roy Zang <tie-fei.zang@freescale.com> Signed-off-by:
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Zhicheng Fan authored
Fix the following errors: Error: p1025rdb.dtsi:326.2-3 label or path, 'qe', not found Error: p1021si-post.dtsi:242.2-3 label or path, 'qe', not found FATAL ERROR: Syntax error parsing input tree Signed-off-by:
Zhicheng Fan <B32736@freescale.com> Signed-off-by:
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- 26 Apr, 2013 11 commits
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Anshuman Khandual authored
Provides basic enablement for perf branch stack sampling framework on POWER8 processor based platforms. Adds new BHRB related elements into cpu_hw_event structure to represent current BHRB config, BHRB filter configuration, manage context and to hold output BHRB buffer during PMU interrupt before passing to the user space. This also enables processing of BHRB data and converts them into generic perf branch stack data format. Signed-off-by:
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Anshuman Khandual authored
This patch populates BHRB specific data for power_pmu structure. It also implements POWER8 specific BHRB filter and configuration functions. Signed-off-by:
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Anshuman Khandual authored
This patch adds couple of generic functions to power_pmu structure which would configure the BHRB and it's filters. It also adds representation of the number of BHRB entries present on the PMU. A new PMU flag PPMU_BHRB would indicate presence of BHRB feature. Signed-off-by:
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Anshuman Khandual authored
This patch adds the basic assembly code to read BHRB buffer. BHRB entries are valid only after a PMU interrupt has happened (when MMCR0[PMAO]=1) and BHRB has been freezed. BHRB read should not be attempted when it is still enabled (MMCR0[PMAE]=1) and getting updated, as this can produce non-deterministic results. Signed-off-by:
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Anshuman Khandual authored
This patch adds new POWER8 instruction encoding for reading and clearing Branch History Rolling Buffer entries. The new instruction 'mfbhrbe' (move from branch history rolling buffer entry) is used to read BHRB buffer entries and instruction 'clrbhrb' (clear branch history rolling buffer) is used to clear the entire buffer. The instruction 'clrbhrb' has straight forward encoding. But the instruction encoding format for reading the BHRB entries is like 'mfbhrbe RT, BHRBE' where it takes two arguments, i.e the index for the BHRB buffer entry to read and a general purpose register to put the value which was read from the buffer entry. Signed-off-by:
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Michael Ellerman authored
This patch adds support for the power8 PMU to perf. Work is ongoing to add generic cache events. Signed-off-by:
Michael Ellerman <michael@ellerman.id.au> Acked-by:
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Michael Ellerman authored
On power8 we have a new SIER (Sampled Instruction Event Register), which captures information about instructions when we have random sampling enabled. Add support for loading the SIER into pt_regs, overloading regs->dar. Also set the new NO_SIPR flag in regs->result if we don't have SIPR. Update regs_sihv/sipr() to look for SIPR/SIHV in SIER. Signed-off-by:
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Michael Ellerman authored
On power8 the presence or absence of SIPR depends on settings at runtime, so convert to using a dynamic flag for NO_SIPR. Existing backends that set NO_SIPR unconditionally set the dynamic flag obviously. Signed-off-by:
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Michael Ellerman authored
Add an accessor for regs->result so we can use it to store more flags in future. Signed-off-by:
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Michael Ellerman authored
On power8 the SIPR and SIHV are not in MMCRA, so convert the routines to take regs and change the names accordingly. Signed-off-by:
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Michael Ellerman authored
In perf_ip_adjust() we potentially use the MMCRA[SLOT] field to adjust the reported IP of a sampled instruction. Currently the logic is written so that if the backend does NOT have the PPMU_ALT_SIPR flag set then we assume MMCRA[SLOT] exists. However on power8 we do not want to set ALT_SIPR (it's in a third location), and we also do not have MMCRA[SLOT]. So add a new flag which only indicates whether MMCRA[SLOT] exists. Naively we'd set it on everything except power6/7, because they set ALT_SIPR, and we've reversed the polarity of the flag. But it's more complicated than that. mpc7450 is 32-bit, and uses its own version of perf_ip_adjust() which doesn't use MMCRA[SLOT], so it doesn't need the new flag set and the behaviour is unchanged. PPC970 (and I assume power4) don't have MMCRA[SLOT], so shouldn't have the new flag set. This is a behaviour change on those cpus, though we were probably getting lucky and the bits in question were 0. power5 and power5+ set the new flag, behaviour unchanged. power6 & power7 do not set the new flag, behaviour unchanged. Signed-off-by:
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