linaro-kernel

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10094 discussions

[PATCH] arm64: mm: Fix operands of clz in __flush_dcache_all

by Anup Patel

From: Sukanto Ghosh <sghosh(a)apm.com> The format of the lower 32-bits of the 64-bit operand to 'dc cisw' is unchanged from ARMv7 architecture and the upper bits are RES0. This implies that the 'way' field of the operand of 'dc cisw' occupies the bit-positions [31 .. (32-A)]. Due to the use of 64-bit extended operands to 'clz', the existing implementation of __flush_dcache_all is incorrectly placing the 'way' field in the bit-positions [63 .. (64-A)]. Signed-off-by: Sukanto Ghosh <sghosh(a)apm.com> Tested-by: Anup Patel <anup.patel(a)linaro.org> --- arch/arm64/mm/cache.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/mm/cache.S b/arch/arm64/mm/cache.S index abe69b8..48a3860 100644 --- a/arch/arm64/mm/cache.S +++ b/arch/arm64/mm/cache.S @@ -52,7 +52,7 @@ loop1: add x2, x2, #4 // add 4 (line length offset) mov x4, #0x3ff and x4, x4, x1, lsr #3 // find maximum number on the way size - clz x5, x4 // find bit position of way size increment + clz w5, w4 // find bit position of way size increment mov x7, #0x7fff and x7, x7, x1, lsr #13 // extract max number of the index size loop2: -- 1.7.9.5

11 years, 12 months

[ACTIVITY] 2013-04-27 - 2013-05-10

by David Long

=== David Long === === Highlights === * Tixy voiced doubts about the approach I used for uprobes being upstreamable due to some redundancy in the kprobe/uprobe code. We talked about an alternative design which I now have partially implemented. * Helped relocate the Nashua office to its new space. === Plans === * Continue with uprobe/kprobe * Start building systemtap === Issues === * None -dl

11 years, 12 months

[Question] Regard Of IKS Implementation

by Leo Yan

hi Nico & all, After we studied the IKS code, we believe the code is general and smoothly and can almost meet well for our own SoC's requirement; here also have some questions want to confirm with you guys: 1. When outbound core wake up inbound core, the outbound core's thread will sleep until the inbound core use MCPM’s early pork to send IPI; a) Looks like this method somehow is due to TC2 board has long letancy to power on/off cluster and core; right? How about to use polling method? because on our own SoC, the wakenup interval will take _only_ about 10 ~ 20us; b) The inbound core will send IPI to outbound core for the synchronization, but at this point the inbound core's GIC's cpu interface is disabled; so even the core's cpu interface is disabled, can the core send SGI to other cores? c) MCPM's patchset merged for mainline have no related function for early pork, so later will early pork related functions be committed to mainline? 2. Now the switching is an async operation, means after the function bL_switch_request is return back, we cannot say switching has been completed; so we have some concern for it. For example, when switch from A15 core to A7 core, then maybe we want to decrease the voltage so that can save power; if the switching is an async operation, then it maybe introduce the issue is: after return back from the function bL_switch_request, then s/w will decrease the voltage; but at the meantime, the real switching is ongoing on another pair cores. i browser the git log and get to know at the beginning the switching is synced by using kernel's workqueue, later changed to use a dedicated kernel thread with FIFO type; do u think it's better to go ahead to add sync method for switching? 3. After enabled switcher, then it will disable hotplug. Actually current code can support hotplug with IKS; because with IKS, the logical core will map the according physical core id and GIC's interface id, so that it can make sure if the system has hotplugged out which physical core, later the kernel can hotplug in this physical core. So could u give more hints why iks need disable hotplug? -- Thx, Leo Yan

11 years, 12 months

[ACTIVITY] (John Stultz) May 6 - 10

by John Stultz

=== Highlights === * Did a first pass at addressing remapping issue for volatile ranges (still waiting on Minchan's feedback) * Updated Anton's KDB/FIQ patch queues. Pinged Jason and sent the short list out to lkml for feedback. * Cherry-picked the ION code into a dev tree against 3.10 to learn more about it in prep for future discussions. * Reached out to Arnd on ION dma questions. * Updated linaro.android tree to pre-3.10-rc1, ran into some trouble testing since panda wasn't booting, but Tixy helped with testing and Kevin followed up with a solution for panda. * Sent out some requests-for-participation emails for Linux Plumbers Android miniconf * Talked w/ Deepak about drivers/clocksource issues and other planning * Reviewed YongQins's get_user macro fix * Reviewed blueprints and had bi-weekly hangout with android upstreaming team * Reviewed Dmitry's vfat ioctl patch * Reviewed Zoran's suspend watchdog patchset & discussed plans for suspend-time logging === Plans === * Get feedback from Minchan and send volatile ranges to lkml * Probably More LPC minisummit planning * Hopefully more ION research/discussion === Issues === * NA

11 years, 12 months

Fwd: unhandled level 1 translation fault

by Aparna Mandke

Hi, I am using linaro 13.03 image with ARMv8 fast model. I am getting following "unhandled L1 translation fault" exception while executing a test. Is it a known problem? Does anybody know its solution? I am getting the same error while executing perl benchmark from SPEC 2000. Thanks, Aparna [[ 364.733273] jsc[834]: unhandled level 1 translation fault (11) at 0xffffffff874c0120, esr 0x92000005 [ 364.733356] pgd = ffffffc87d22b000 [ 364.733421] [ffffffff874c0120] *pgd=00000008ffeb9003, *pmd=00000008fe78f003, *pte=00a00008fbd74f53 [ 364.733573] [ 364.733631] Pid: 834, comm: jsc [ 364.733716] CPU: 0 Not tainted (3.9.0-1-linaro-vexpress64 #1ubuntu1~ci+130320041336) [ 364.733796] PC is at 0x4f69d4 [ 364.733860] LR is at 0x44cdec [ 364.733933] pc : [<00000000004f69d4>] lr : [<000000000044cdec>] pstate: 60000000 [ 364.734008] sp : 0000007ff1c891f0 [ 364.734070] x29: 0000007ff1c891f0 x28: 0000000000000000 [ 364.734188] x27: 0000007ff1c89db8 x26: 00000000005258a0 [ 364.734308] x25: 0000007f89342fa8 x24: 0000007f874c00c0 [ 364.734428] x23: 0000007ff1c89900 x22: 000000003f66ea48 [ 364.734548] x21: 0000007f89342e00 x20: 0000007f8933a4b0 [ 364.734669] x19: ffffffff874c0100 x18: 0000007ff1c899a0 [ 364.734789] x17: 0000007f8a2ac7d4 x16: 00000000005827b8 [ 364.734908] x15: 0000007f8a0ca590 x14: 0000000000000000 [ 364.735026] x13: 000000000000001f x12: 0000000000000000 [ 364.735144] x11: 0000000000000000 x10: 0000007f89345420 [ 364.735262] x9 : 000000000000000f x8 : 000000000000000f [ 364.735378] x7 : 000000000000000f x6 : 0000007f89353ca0 [ 364.735498] x5 : 0000007f893433e8 x4 : 0000007f89353cc0 [ 364.735618] x3 : 0000007f89353c40 x2 : 0000000000000003 [ 364.735735] x1 : 000000003f66ea48 x0 : 0000000000000000 [ 364.735845]

12 years

Panda board not booting w/ pre 3.10-rc1?

by John Stultz

Hey Kevin, Sorry to pester you, but you've always been helpful with these sort of questions. I'm trying to test a pre 3.10-rc1 kernel on panda, and its hanging after "Starting kernel ..." 3.9 boots fine, and I was curious if you had any hints as to what new config magic I need to get things going. Attached are my good/bad configs. thanks -john

12 years

[PATCH] arm64: KVM: Fix HCR_EL2 and VTCR_EL2 configuration bits

by Pranavkumar Sawargaonkar

This patch does following fixes: 1. Make HCR_* flags as unsigned long long constants Reason : By default, compiler assumes numeric constants as signed hence sign extending it when assigned to unsigned variable such as hcr_el2 (in VCPU context). This accidently sets HCR_ID and HCR_CD making entire guest memory non-cacheable. On real HW, this breaks Stage2 ttbl walks and also breaks VirtIO. 2. VTCR_EL2_ORGN0_WBWA and VTCR_EL2_IRGN0_WBWA macros. Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar(a)linaro.org> Signed-off-by: Anup Patel <anup.patel(a)linaro.org> --- arch/arm64/include/asm/kvm_arm.h | 73 +++++++++++++++++++------------------- 1 file changed, 37 insertions(+), 36 deletions(-) diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h index 8ced0ca..0a951db 100644 --- a/arch/arm64/include/asm/kvm_arm.h +++ b/arch/arm64/include/asm/kvm_arm.h @@ -18,44 +18,45 @@ #ifndef __ARM64_KVM_ARM_H__ #define __ARM64_KVM_ARM_H__ +#include <linux/const.h> #include <asm/types.h> /* Hyp Configuration Register (HCR) bits */ -#define HCR_ID (1 << 33) -#define HCR_CD (1 << 32) +#define HCR_ID (_AC(0x1, ULL) << 33) +#define HCR_CD (_AC(0x1, ULL) << 32) #define HCR_RW_SHIFT 31 -#define HCR_RW (1 << HCR_RW_SHIFT) -#define HCR_TRVM (1 << 30) -#define HCR_HCD (1 << 29) -#define HCR_TDZ (1 << 28) -#define HCR_TGE (1 << 27) -#define HCR_TVM (1 << 26) -#define HCR_TTLB (1 << 25) -#define HCR_TPU (1 << 24) -#define HCR_TPC (1 << 23) -#define HCR_TSW (1 << 22) -#define HCR_TAC (1 << 21) -#define HCR_TIDCP (1 << 20) -#define HCR_TSC (1 << 19) -#define HCR_TID3 (1 << 18) -#define HCR_TID2 (1 << 17) -#define HCR_TID1 (1 << 16) -#define HCR_TID0 (1 << 15) -#define HCR_TWE (1 << 14) -#define HCR_TWI (1 << 13) -#define HCR_DC (1 << 12) -#define HCR_BSU (3 << 10) -#define HCR_BSU_IS (1 << 10) -#define HCR_FB (1 << 9) -#define HCR_VA (1 << 8) -#define HCR_VI (1 << 7) -#define HCR_VF (1 << 6) -#define HCR_AMO (1 << 5) -#define HCR_IMO (1 << 4) -#define HCR_FMO (1 << 3) -#define HCR_PTW (1 << 2) -#define HCR_SWIO (1 << 1) -#define HCR_VM (1) +#define HCR_RW (_AC(0x1, ULL) << HCR_RW_SHIFT) +#define HCR_TRVM (_AC(0x1, ULL) << 30) +#define HCR_HCD (_AC(0x1, ULL) << 29) +#define HCR_TDZ (_AC(0x1, ULL) << 28) +#define HCR_TGE (_AC(0x1, ULL) << 27) +#define HCR_TVM (_AC(0x1, ULL) << 26) +#define HCR_TTLB (_AC(0x1, ULL) << 25) +#define HCR_TPU (_AC(0x1, ULL) << 24) +#define HCR_TPC (_AC(0x1, ULL) << 23) +#define HCR_TSW (_AC(0x1, ULL) << 22) +#define HCR_TAC (_AC(0x1, ULL) << 21) +#define HCR_TIDCP (_AC(0x1, ULL) << 20) +#define HCR_TSC (_AC(0x1, ULL) << 19) +#define HCR_TID3 (_AC(0x1, ULL) << 18) +#define HCR_TID2 (_AC(0x1, ULL) << 17) +#define HCR_TID1 (_AC(0x1, ULL) << 16) +#define HCR_TID0 (_AC(0x1, ULL) << 15) +#define HCR_TWE (_AC(0x1, ULL) << 14) +#define HCR_TWI (_AC(0x1, ULL) << 13) +#define HCR_DC (_AC(0x1, ULL) << 12) +#define HCR_BSU (_AC(0x3, ULL) << 10) +#define HCR_BSU_IS (_AC(0x1, ULL) << 10) +#define HCR_FB (_AC(0x1, ULL) << 9) +#define HCR_VA (_AC(0x1, ULL) << 8) +#define HCR_VI (_AC(0x1, ULL) << 7) +#define HCR_VF (_AC(0x1, ULL) << 6) +#define HCR_AMO (_AC(0x1, ULL) << 5) +#define HCR_IMO (_AC(0x1, ULL) << 4) +#define HCR_FMO (_AC(0x1, ULL) << 3) +#define HCR_PTW (_AC(0x1, ULL) << 2) +#define HCR_SWIO (_AC(0x1, ULL) << 1) +#define HCR_VM (_AC(0x1, ULL)) /* * The bits we set in HCR: @@ -111,9 +112,9 @@ #define VTCR_EL2_SH0_MASK (3 << 12) #define VTCR_EL2_SH0_INNER (3 << 12) #define VTCR_EL2_ORGN0_MASK (3 << 10) -#define VTCR_EL2_ORGN0_WBWA (3 << 10) +#define VTCR_EL2_ORGN0_WBWA (1 << 10) #define VTCR_EL2_IRGN0_MASK (3 << 8) -#define VTCR_EL2_IRGN0_WBWA (3 << 8) +#define VTCR_EL2_IRGN0_WBWA (1 << 8) #define VTCR_EL2_SL0_MASK (3 << 6) #define VTCR_EL2_SL0_LVL1 (1 << 6) #define VTCR_EL2_T0SZ_MASK 0x3f -- 1.7.9.5

12 years

[PATCH 0/2] Early printk support for virtio console devices.

by Pranavkumar Sawargaonkar

This patch-set implements early printk support for virtio console devices without using any hypercalls. The current virtio early printk code in kernel expects that hypervisor will provide some mechanism generally a hypercall to support early printk. This patch-set does not break existing hypercall based early print support. This implementation adds: 1. Early writeonly register named early_wr in virtio console's config space. 2. Host feature flags namely VIRTIO_CONSOLE_F_EARLY_WRITE for telling guest about early-write capability in console device. Early write mechanism: 1. When a guest wants to out some character, it has to simply write the character to early_wr register in config space of virtio console device. Pranavkumar Sawargaonkar (2): virtio: console: Add early writeonly register to config space arm64: earlyprintk support for virtio-mmio console Documentation/virtual/virtio-spec.txt | 13 ++++++++++-- arch/arm64/kernel/early_printk.c | 35 +++++++++++++++++++++++++++++++++ include/uapi/linux/virtio_console.h | 3 +++ 3 files changed, 49 insertions(+), 2 deletions(-) -- 1.7.9.5

12 years

[PATCH] arm64: KVM: Add bits for specifying memory type in stage2 PTE

by Anup Patel

We cannot use existing stage1 PTE_ATTRINDX() macro for specifying stage2 memory type because stage1 ATTRINDX = PTE[4:2] and stage2 MEMATTR = PTE[5:2]. This patch adds bit definetions for specifying device, noncacheable, writethrough, and writeback memory types in stage2 PTE and also uses it in PAGE_S2 and PAGE_S2_DEVICE. Signed-off-by: Anup Patel <anup.patel(a)linaro.org> Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar(a)linaro.org> --- arch/arm64/include/asm/pgtable-hwdef.h | 4 ++++ arch/arm64/include/asm/pgtable.h | 6 ++++-- arch/arm64/mm/mmu.c | 9 +++++++++ 3 files changed, 17 insertions(+), 2 deletions(-) diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h index c49cd61..555babb 100644 --- a/arch/arm64/include/asm/pgtable-hwdef.h +++ b/arch/arm64/include/asm/pgtable-hwdef.h @@ -73,6 +73,10 @@ */ #define PTE_S2_RDONLY (_AT(pteval_t, 1) << 6) /* HAP[1] */ #define PTE_S2_RDWR (_AT(pteval_t, 3) << 6) /* HAP[2:1] */ +#define PTE_S2_MT_DEVICE (_AT(pteval_t, 0x0) << 2) /* MemAttr[3:0] */ +#define PTE_S2_MT_UNCACHED (_AT(pteval_t, 0x5) << 2) /* MemAttr[3:0] */ +#define PTE_S2_MT_WRITETHROUGH (_AT(pteval_t, 0xa) << 2) /* MemAttr[3:0] */ +#define PTE_S2_MT_WRITEBACK (_AT(pteval_t, 0xf) << 2) /* MemAttr[3:0] */ /* * EL2/HYP PTE/PMD definitions diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 43ce724..3003fd0 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -60,6 +60,8 @@ extern void __pgd_error(const char *file, int line, unsigned long val); #define _PAGE_DEFAULT PTE_TYPE_PAGE | PTE_AF extern pgprot_t pgprot_default; +extern pgprot_t pgprot_s2; +extern pgprot_t pgprot_s2_device; #define __pgprot_modify(prot,mask,bits) \ __pgprot((pgprot_val(prot) & ~(mask)) | (bits)) @@ -79,8 +81,8 @@ extern pgprot_t pgprot_default; #define PAGE_HYP _MOD_PROT(pgprot_default, PTE_HYP) #define PAGE_HYP_DEVICE _MOD_PROT(__pgprot(PROT_DEVICE_nGnRE), PTE_HYP) -#define PAGE_S2 _MOD_PROT(pgprot_default, PTE_S2_RDONLY) -#define PAGE_S2_DEVICE __pgprot_modify(__pgprot(PROT_DEVICE_nGnRE), PTE_PXN, PTE_S2_RDWR) +#define PAGE_S2 _MOD_PROT(pgprot_s2, PTE_USER | PTE_S2_RDONLY) +#define PAGE_S2_DEVICE _MOD_PROT(pgprot_s2_device, PTE_USER | PTE_S2_RDWR) #define __PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE) #define __PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 70b8cd4..ef26978 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -46,6 +46,12 @@ EXPORT_SYMBOL(empty_zero_page); pgprot_t pgprot_default; EXPORT_SYMBOL(pgprot_default); +pgprot_t pgprot_s2; +EXPORT_SYMBOL(pgprot_s2); + +pgprot_t pgprot_s2_device; +EXPORT_SYMBOL(pgprot_s2_device); + static pmdval_t prot_sect_kernel; struct cachepolicy { @@ -147,6 +153,9 @@ static void __init init_mem_pgprot(void) } pgprot_default = __pgprot(PTE_TYPE_PAGE | PTE_AF | default_pgprot); + + pgprot_s2 = __pgprot(PTE_TYPE_PAGE | PTE_AF | PTE_SHARED | PTE_S2_MT_WRITEBACK); + pgprot_s2_device = __pgprot(PTE_TYPE_PAGE | PTE_AF | PTE_S2_MT_DEVICE); } pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, -- 1.7.9.5

12 years

compilation error while compiling 13.04 build

by Aparna Mandke

Hi, I checked out 13.04 build and followed instructions from "Building from suorce" tab. https://releases.linaro.org/13.04/openembedded/aarch64/ I compiled using "bitbake linaro-image-sdk". I am getting following error. Does anybody know what is the problem? Thanks, Aparna getdents.h:60:16: note: each undeclared identifier is reported only once for each function it appears in | In file included from getdents01.c:57:0: | getdents.h: In function 'getdents': | getdents.h:60:16: error: 'SYS_getdents' undeclared (first use in this function) | getdents.h:60:16: note: each undeclared identifier is reported only once for each function it appears in | In file included from getdents03.c:56:0: | getdents.h: In function 'getdents': | getdents.h:60:16: error: 'SYS_getdents' undeclared (first use in this function) | getdents.h:60:16: note: each undeclared identifier is reported only once for each function it appears in | In file included from getdents02.c:53:0: | getdents.h: In function 'getdents':In file included from getdents04.c:56:0: | getdents.h: In function 'getdents': | | getdents.h:60:16: error: 'SYS_getdents' undeclared (first use in this function)getdents.h:60:16: error: 'SYS_getdents' undeclared (first use in this function) | | getdents.h:60:16: note: each undeclared identifier is reported only once for each function it appears in | getdents.h:60:16: note: each undeclared identifier is reported only once for each function it appears in | In file included from getdents02.c:53:0: | getdents.h: In function 'getdents': | getdents.h:60:16: error: 'SYS_getdents' undeclared (first use in this function) | getdents.h:60:16: note: each undeclared identifier is reported only once for each function it appears in | In file included from getdents03.c:56:0: | getdents.h: In function 'getdents': | getdents.h:60:16: error: 'SYS_getdents' undeclared (first use in this function) | getdents.h:60:16: note: each undeclared identifier is reported only once for each function it appears in | make[4]: *** [getdents01] Error 1 | make[4]: *** Waiting for unfinished jobs.... | make[4]: *** [getdents01_64.o] Error 1 | make[4]: *** [getdents03] Error 1 | make[4]: *** [getdents02] Error 1 | make[4]: *** [getdents04] Error 1 | In file included from getdents04.c:56:0: | getdents.h: In function 'getdents': | getdents.h:60:16: error: 'SYS_getdents' undeclared (first use in this function) | getdents.h:60:16: note: each undeclared identifier is reported only once for each function it appears in | make[4]: *** [getdents03_64.o] Error 1 | make[4]: *** [getdents02_64.o] Error 1 | make[4]: *** [getdents04_64.o] Error 1 | make[4]: Leaving directory `/home/kvs/aparna/openembedded/build/tmp-eglibc/work/aarch64-oe-linux/ltp/20120903-r2/ltp-20120903/testcases/kernel/syscalls/getdents' | make[3]: *** [all] Error 2 | make[3]: Leaving directory `/home/kvs/aparna/openembedded/build/tmp-eglibc/work/aarch64-oe-linux/ltp/20120903-r2/ltp-20120903/testcases/kernel/syscalls' | make[2]: *** [all] Error 2 | make[2]: Leaving directory `/home/kvs/aparna/openembedded/build/tmp-eglibc/work/aarch64-oe-linux/ltp/20120903-r2/ltp-20120903/testcases/kernel' | make[1]: *** [all] Error 2 | make[1]: Leaving directory `/home/kvs/aparna/openembedded/build/tmp-eglibc/work/aarch64-oe-linux/ltp/20120903-r2/ltp-20120903/testcases' | make: *** [testcases-all] Error 2 | ERROR: oe_runmake failed

12 years

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