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[pull] master from torvalds:master #120
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The "auxtrace_info" and "auxtrace" functions are not set in "tool" member of "annotate". As a result, perf annotate does not support parsing itrace data. Before: # perf record -e arm_spe_0/branch_filter=1/ -a sleep 1 [ perf record: Woken up 9 times to write data ] [ perf record: Captured and wrote 20.874 MB perf.data ] # perf annotate --stdio Error: The perf.data data has no samples! Solution: 1. Add itrace options in help, 2. Set hook functions of "id_index", "auxtrace_info" and "auxtrace" in perf_tool. After: # perf record --all-user -e arm_spe_0/branch_filter=1/ ls Couldn't synthesize bpf events. perf.data [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.010 MB perf.data ] # perf annotate --stdio Percent | Source code & Disassembly of libc-2.28.so for branch-miss (1 samples, percent: local period) ------------------------------------------------------------------------------------------------------------ : : : : Disassembly of section .text: : : 0000000000066180 <__getdelim@@GLIBC_2.17>: 0.00 : 66180: stp x29, x30, [sp, #-96]! 0.00 : 66184: cmp x0, #0x0 0.00 : 66188: ccmp x1, #0x0, #0x4, ne // ne = any 0.00 : 6618c: mov x29, sp 0.00 : 66190: stp x24, x25, [sp, #56] 0.00 : 66194: stp x26, x27, [sp, #72] 0.00 : 66198: str x28, [sp, #88] 0.00 : 6619c: b.eq 66450 <__getdelim@@GLIBC_2.17+0x2d0> // b.none 0.00 : 661a0: stp x22, x23, [x29, #40] 0.00 : 661a4: mov x22, x1 0.00 : 661a8: ldr w1, [x3] 0.00 : 661ac: mov w23, w2 0.00 : 661b0: stp x20, x21, [x29, #24] 0.00 : 661b4: mov x20, x3 0.00 : 661b8: mov x21, x0 0.00 : 661bc: tbnz w1, #15, 66360 <__getdelim@@GLIBC_2.17+0x1e0> 0.00 : 661c0: ldr x0, [x3, #136] 0.00 : 661c4: ldr x2, [x0, #8] 0.00 : 661c8: str x19, [x29, #16] 0.00 : 661cc: mrs x19, tpidr_el0 0.00 : 661d0: sub x19, x19, #0x700 0.00 : 661d4: cmp x2, x19 0.00 : 661d8: b.eq 663f0 <__getdelim@@GLIBC_2.17+0x270> // b.none 0.00 : 661dc: mov w1, #0x1 // #1 0.00 : 661e0: ldaxr w2, [x0] 0.00 : 661e4: cmp w2, #0x0 0.00 : 661e8: b.ne 661f4 <__getdelim@@GLIBC_2.17+0x74> // b.any 0.00 : 661ec: stxr w3, w1, [x0] 0.00 : 661f0: cbnz w3, 661e0 <__getdelim@@GLIBC_2.17+0x60> 0.00 : 661f4: b.ne 66448 <__getdelim@@GLIBC_2.17+0x2c8> // b.any 0.00 : 661f8: ldr x0, [x20, #136] 0.00 : 661fc: ldr w1, [x20] 0.00 : 66200: ldr w2, [x0, #4] 0.00 : 66204: str x19, [x0, #8] 0.00 : 66208: add w2, w2, #0x1 0.00 : 6620c: str w2, [x0, #4] 0.00 : 66210: tbnz w1, #5, 66388 <__getdelim@@GLIBC_2.17+0x208> 0.00 : 66214: ldr x19, [x29, #16] 0.00 : 66218: ldr x0, [x21] 0.00 : 6621c: cbz x0, 66228 <__getdelim@@GLIBC_2.17+0xa8> 0.00 : 66220: ldr x0, [x22] 0.00 : 66224: cbnz x0, 6623c <__getdelim@@GLIBC_2.17+0xbc> 0.00 : 66228: mov x0, #0x78 // #120 0.00 : 6622c: str x0, [x22] 0.00 : 66230: bl 20710 <malloc@plt> 0.00 : 66234: str x0, [x21] 0.00 : 66238: cbz x0, 66428 <__getdelim@@GLIBC_2.17+0x2a8> 0.00 : 6623c: ldr x27, [x20, #8] 0.00 : 66240: str x19, [x29, #16] 0.00 : 66244: ldr x19, [x20, #16] 0.00 : 66248: sub x19, x19, x27 0.00 : 6624c: cmp x19, #0x0 0.00 : 66250: b.le 66398 <__getdelim@@GLIBC_2.17+0x218> 0.00 : 66254: mov x25, #0x0 // #0 0.00 : 66258: b 662d8 <__getdelim@@GLIBC_2.17+0x158> 0.00 : 6625c: nop 0.00 : 66260: add x24, x19, x25 0.00 : 66264: ldr x3, [x22] 0.00 : 66268: add x26, x24, #0x1 0.00 : 6626c: ldr x0, [x21] 0.00 : 66270: cmp x3, x26 0.00 : 66274: b.cs 6629c <__getdelim@@GLIBC_2.17+0x11c> // b.hs, b.nlast 0.00 : 66278: lsl x3, x3, #1 0.00 : 6627c: cmp x3, x26 0.00 : 66280: csel x26, x3, x26, cs // cs = hs, nlast 0.00 : 66284: mov x1, x26 0.00 : 66288: bl 206f0 <realloc@plt> 0.00 : 6628c: cbz x0, 66438 <__getdelim@@GLIBC_2.17+0x2b8> 0.00 : 66290: str x0, [x21] 0.00 : 66294: ldr x27, [x20, #8] 0.00 : 66298: str x26, [x22] 0.00 : 6629c: mov x2, x19 0.00 : 662a0: mov x1, x27 0.00 : 662a4: add x0, x0, x25 0.00 : 662a8: bl 87390 <explicit_bzero@@GLIBC_2.25+0x50> 0.00 : 662ac: ldr x0, [x20, #8] 0.00 : 662b0: add x19, x0, x19 0.00 : 662b4: str x19, [x20, #8] 0.00 : 662b8: cbnz x28, 66410 <__getdelim@@GLIBC_2.17+0x290> 0.00 : 662bc: mov x0, x20 0.00 : 662c0: bl 73b80 <__underflow@@GLIBC_2.17> 0.00 : 662c4: cmn w0, #0x1 0.00 : 662c8: b.eq 66410 <__getdelim@@GLIBC_2.17+0x290> // b.none 0.00 : 662cc: ldp x27, x19, [x20, #8] 0.00 : 662d0: mov x25, x24 0.00 : 662d4: sub x19, x19, x27 0.00 : 662d8: mov x2, x19 0.00 : 662dc: mov w1, w23 0.00 : 662e0: mov x0, x27 0.00 : 662e4: bl 807b0 <memchr@@GLIBC_2.17> 0.00 : 662e8: cmp x0, #0x0 0.00 : 662ec: mov x28, x0 0.00 : 662f0: sub x0, x0, x27 0.00 : 662f4: csinc x19, x19, x0, eq // eq = none 0.00 : 662f8: mov x0, #0x7fffffffffffffff // #9223372036854775807 0.00 : 662fc: sub x0, x0, x25 0.00 : 66300: cmp x19, x0 0.00 : 66304: b.lt 66260 <__getdelim@@GLIBC_2.17+0xe0> // b.tstop 0.00 : 66308: adrp x0, 17f000 <sys_sigabbrev@@GLIBC_2.17+0x320> 0.00 : 6630c: ldr x0, [x0, #3624] 0.00 : 66310: mrs x2, tpidr_el0 0.00 : 66314: ldr x19, [x29, #16] 0.00 : 66318: mov w3, #0x4b // #75 0.00 : 6631c: ldr w1, [x20] 0.00 : 66320: mov x24, #0xffffffffffffffff // #-1 0.00 : 66324: str w3, [x2, x0] 0.00 : 66328: tbnz w1, #15, 66340 <__getdelim@@GLIBC_2.17+0x1c0> 0.00 : 6632c: ldr x0, [x20, #136] 0.00 : 66330: ldr w1, [x0, #4] 0.00 : 66334: sub w1, w1, #0x1 0.00 : 66338: str w1, [x0, #4] 0.00 : 6633c: cbz w1, 663b8 <__getdelim@@GLIBC_2.17+0x238> 0.00 : 66340: mov x0, x24 0.00 : 66344: ldr x28, [sp, #88] 0.00 : 66348: ldp x20, x21, [x29, #24] 0.00 : 6634c: ldp x22, x23, [x29, #40] 0.00 : 66350: ldp x24, x25, [sp, #56] 0.00 : 66354: ldp x26, x27, [sp, #72] 0.00 : 66358: ldp x29, x30, [sp], #96 0.00 : 6635c: ret 100.00 : 66360: tbz w1, #5, 66218 <__getdelim@@GLIBC_2.17+0x98> 0.00 : 66364: ldp x20, x21, [x29, #24] 0.00 : 66368: mov x24, #0xffffffffffffffff // #-1 0.00 : 6636c: ldp x22, x23, [x29, #40] 0.00 : 66370: mov x0, x24 0.00 : 66374: ldp x24, x25, [sp, #56] 0.00 : 66378: ldp x26, x27, [sp, #72] 0.00 : 6637c: ldr x28, [sp, #88] 0.00 : 66380: ldp x29, x30, [sp], #96 0.00 : 66384: ret 0.00 : 66388: mov x24, #0xffffffffffffffff // #-1 0.00 : 6638c: ldr x19, [x29, #16] 0.00 : 66390: b 66328 <__getdelim@@GLIBC_2.17+0x1a8> 0.00 : 66394: nop 0.00 : 66398: mov x0, x20 0.00 : 6639c: bl 73b80 <__underflow@@GLIBC_2.17> 0.00 : 663a0: cmn w0, #0x1 0.00 : 663a4: b.eq 66438 <__getdelim@@GLIBC_2.17+0x2b8> // b.none 0.00 : 663a8: ldp x27, x19, [x20, #8] 0.00 : 663ac: sub x19, x19, x27 0.00 : 663b0: b 66254 <__getdelim@@GLIBC_2.17+0xd4> 0.00 : 663b4: nop 0.00 : 663b8: str xzr, [x0, #8] 0.00 : 663bc: ldxr w2, [x0] 0.00 : 663c0: stlxr w3, w1, [x0] 0.00 : 663c4: cbnz w3, 663bc <__getdelim@@GLIBC_2.17+0x23c> 0.00 : 663c8: cmp w2, #0x1 0.00 : 663cc: b.le 66340 <__getdelim@@GLIBC_2.17+0x1c0> 0.00 : 663d0: mov x1, #0x81 // #129 0.00 : 663d4: mov x2, #0x1 // #1 0.00 : 663d8: mov x3, #0x0 // #0 0.00 : 663dc: mov x8, #0x62 // #98 0.00 : 663e0: svc #0x0 0.00 : 663e4: ldp x20, x21, [x29, #24] 0.00 : 663e8: ldp x22, x23, [x29, #40] 0.00 : 663ec: b 66370 <__getdelim@@GLIBC_2.17+0x1f0> 0.00 : 663f0: ldr w2, [x0, #4] 0.00 : 663f4: add w2, w2, #0x1 0.00 : 663f8: str w2, [x0, #4] 0.00 : 663fc: tbz w1, #5, 66214 <__getdelim@@GLIBC_2.17+0x94> 0.00 : 66400: mov x24, #0xffffffffffffffff // #-1 0.00 : 66404: ldr x19, [x29, #16] 0.00 : 66408: b 66330 <__getdelim@@GLIBC_2.17+0x1b0> 0.00 : 6640c: nop 0.00 : 66410: ldr x0, [x21] 0.00 : 66414: strb wzr, [x0, x24] 0.00 : 66418: ldr w1, [x20] 0.00 : 6641c: ldr x19, [x29, #16] 0.00 : 66420: b 66328 <__getdelim@@GLIBC_2.17+0x1a8> 0.00 : 66424: nop 0.00 : 66428: mov x24, #0xffffffffffffffff // #-1 0.00 : 6642c: ldr w1, [x20] 0.00 : 66430: b 66328 <__getdelim@@GLIBC_2.17+0x1a8> 0.00 : 66434: nop 0.00 : 66438: mov x24, #0xffffffffffffffff // #-1 0.00 : 6643c: ldr w1, [x20] 0.00 : 66440: ldr x19, [x29, #16] 0.00 : 66444: b 66328 <__getdelim@@GLIBC_2.17+0x1a8> 0.00 : 66448: bl e3ba0 <pthread_setcanceltype@@GLIBC_2.17+0x30> 0.00 : 6644c: b 661f8 <__getdelim@@GLIBC_2.17+0x78> 0.00 : 66450: adrp x0, 17f000 <sys_sigabbrev@@GLIBC_2.17+0x320> 0.00 : 66454: ldr x0, [x0, #3624] 0.00 : 66458: mrs x1, tpidr_el0 0.00 : 6645c: mov w2, #0x16 // #22 0.00 : 66460: mov x24, #0xffffffffffffffff // #-1 0.00 : 66464: str w2, [x1, x0] 0.00 : 66468: b 66370 <__getdelim@@GLIBC_2.17+0x1f0> 0.00 : 6646c: ldr w1, [x20] 0.00 : 66470: mov x4, x0 0.00 : 66474: tbnz w1, #15, 6648c <__getdelim@@GLIBC_2.17+0x30c> 0.00 : 66478: ldr x0, [x20, #136] 0.00 : 6647c: ldr w1, [x0, #4] 0.00 : 66480: sub w1, w1, #0x1 0.00 : 66484: str w1, [x0, #4] 0.00 : 66488: cbz w1, 66494 <__getdelim@@GLIBC_2.17+0x314> 0.00 : 6648c: mov x0, x4 0.00 : 66490: bl 20e40 <gnu_get_libc_version@@GLIBC_2.17+0x130> 0.00 : 66494: str xzr, [x0, #8] 0.00 : 66498: ldxr w2, [x0] 0.00 : 6649c: stlxr w3, w1, [x0] 0.00 : 664a0: cbnz w3, 66498 <__getdelim@@GLIBC_2.17+0x318> 0.00 : 664a4: cmp w2, #0x1 0.00 : 664a8: b.le 6648c <__getdelim@@GLIBC_2.17+0x30c> 0.00 : 664ac: mov x1, #0x81 // #129 0.00 : 664b0: mov x2, #0x1 // #1 0.00 : 664b4: mov x3, #0x0 // #0 0.00 : 664b8: mov x8, #0x62 // #98 0.00 : 664bc: svc #0x0 0.00 : 664c0: b 6648c <__getdelim@@GLIBC_2.17+0x30c> Signed-off-by: Yang Jihong <[email protected]> Tested-by: Leo Yan <[email protected]> Acked-by: Adrian Hunter <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Peter Zijlstra <[email protected]> Link: http://lore.kernel.org/lkml/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
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The inline assembly for arm64's cmpxchg_double*() implementations use a +Q constraint to hazard against other accesses to the memory location being exchanged. However, the pointer passed to the constraint is a pointer to unsigned long, and thus the hazard only applies to the first 8 bytes of the location. GCC can take advantage of this, assuming that other portions of the location are unchanged, leading to a number of potential problems. This is similar to what we fixed back in commit: fee960b ("arm64: xchg: hazard against entire exchange variable") ... but we forgot to adjust cmpxchg_double*() similarly at the same time. The same problem applies, as demonstrated with the following test: | struct big { | u64 lo, hi; | } __aligned(128); | | unsigned long foo(struct big *b) | { | u64 hi_old, hi_new; | | hi_old = b->hi; | cmpxchg_double_local(&b->lo, &b->hi, 0x12, 0x34, 0x56, 0x78); | hi_new = b->hi; | | return hi_old ^ hi_new; | } ... which GCC 12.1.0 compiles as: | 0000000000000000 <foo>: | 0: d503233f paciasp | 4: aa0003e4 mov x4, x0 | 8: 1400000e b 40 <foo+0x40> | c: d2800240 mov x0, #0x12 // #18 | 10: d2800681 mov x1, #0x34 // #52 | 14: aa0003e5 mov x5, x0 | 18: aa0103e6 mov x6, x1 | 1c: d2800ac2 mov x2, #0x56 // #86 | 20: d2800f03 mov x3, #0x78 // #120 | 24: 48207c82 casp x0, x1, x2, x3, [x4] | 28: ca050000 eor x0, x0, x5 | 2c: ca060021 eor x1, x1, x6 | 30: aa010000 orr x0, x0, x1 | 34: d2800000 mov x0, #0x0 // #0 <--- BANG | 38: d50323bf autiasp | 3c: d65f03c0 ret | 40: d2800240 mov x0, #0x12 // #18 | 44: d2800681 mov x1, #0x34 // #52 | 48: d2800ac2 mov x2, #0x56 // #86 | 4c: d2800f03 mov x3, #0x78 // #120 | 50: f9800091 prfm pstl1strm, [x4] | 54: c87f1885 ldxp x5, x6, [x4] | 58: ca0000a5 eor x5, x5, x0 | 5c: ca0100c6 eor x6, x6, x1 | 60: aa0600a6 orr x6, x5, x6 | 64: b5000066 cbnz x6, 70 <foo+0x70> | 68: c8250c82 stxp w5, x2, x3, [x4] | 6c: 35ffff45 cbnz w5, 54 <foo+0x54> | 70: d2800000 mov x0, #0x0 // #0 <--- BANG | 74: d50323bf autiasp | 78: d65f03c0 ret Notice that at the lines with "BANG" comments, GCC has assumed that the higher 8 bytes are unchanged by the cmpxchg_double() call, and that `hi_old ^ hi_new` can be reduced to a constant zero, for both LSE and LL/SC versions of cmpxchg_double(). This patch fixes the issue by passing a pointer to __uint128_t into the +Q constraint, ensuring that the compiler hazards against the entire 16 bytes being modified. With this change, GCC 12.1.0 compiles the above test as: | 0000000000000000 <foo>: | 0: f9400407 ldr x7, [x0, #8] | 4: d503233f paciasp | 8: aa0003e4 mov x4, x0 | c: 1400000f b 48 <foo+0x48> | 10: d2800240 mov x0, #0x12 // #18 | 14: d2800681 mov x1, #0x34 // #52 | 18: aa0003e5 mov x5, x0 | 1c: aa0103e6 mov x6, x1 | 20: d2800ac2 mov x2, #0x56 // #86 | 24: d2800f03 mov x3, #0x78 // #120 | 28: 48207c82 casp x0, x1, x2, x3, [x4] | 2c: ca050000 eor x0, x0, x5 | 30: ca060021 eor x1, x1, x6 | 34: aa010000 orr x0, x0, x1 | 38: f9400480 ldr x0, [x4, #8] | 3c: d50323bf autiasp | 40: ca0000e0 eor x0, x7, x0 | 44: d65f03c0 ret | 48: d2800240 mov x0, #0x12 // #18 | 4c: d2800681 mov x1, #0x34 // #52 | 50: d2800ac2 mov x2, #0x56 // #86 | 54: d2800f03 mov x3, #0x78 // #120 | 58: f9800091 prfm pstl1strm, [x4] | 5c: c87f1885 ldxp x5, x6, [x4] | 60: ca0000a5 eor x5, x5, x0 | 64: ca0100c6 eor x6, x6, x1 | 68: aa0600a6 orr x6, x5, x6 | 6c: b5000066 cbnz x6, 78 <foo+0x78> | 70: c8250c82 stxp w5, x2, x3, [x4] | 74: 35ffff45 cbnz w5, 5c <foo+0x5c> | 78: f9400480 ldr x0, [x4, #8] | 7c: d50323bf autiasp | 80: ca0000e0 eor x0, x7, x0 | 84: d65f03c0 ret ... sampling the high 8 bytes before and after the cmpxchg, and performing an EOR, as we'd expect. For backporting, I've tested this atop linux-4.9.y with GCC 5.5.0. Note that linux-4.9.y is oldest currently supported stable release, and mandates GCC 5.1+. Unfortunately I couldn't get a GCC 5.1 binary to run on my machines due to library incompatibilities. I've also used a standalone test to check that we can use a __uint128_t pointer in a +Q constraint at least as far back as GCC 4.8.5 and LLVM 3.9.1. Fixes: 5284e1b ("arm64: xchg: Implement cmpxchg_double") Fixes: e9a4b79 ("arm64: cmpxchg_dbl: patch in lse instructions when supported by the CPU") Reported-by: Boqun Feng <[email protected]> Link: https://lore.kernel.org/lkml/Y6DEfQXymYVgL3oJ@boqun-archlinux/ Reported-by: Peter Zijlstra <[email protected]> Link: https://lore.kernel.org/lkml/[email protected]/ Signed-off-by: Mark Rutland <[email protected]> Cc: [email protected] Cc: Arnd Bergmann <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Steve Capper <[email protected]> Cc: Will Deacon <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Will Deacon <[email protected]>
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Like commit 1cf3bfc ("bpf: Support 64-bit pointers to kfuncs") for s390x, add support for 64-bit pointers to kfuncs for LoongArch. Since the infrastructure is already implemented in BPF core, the only thing need to be done is to override bpf_jit_supports_far_kfunc_call(). Before this change, several test_verifier tests failed: # ./test_verifier | grep # | grep FAIL #119/p calls: invalid kfunc call: ptr_to_mem to struct with non-scalar FAIL #120/p calls: invalid kfunc call: ptr_to_mem to struct with nesting depth > 4 FAIL #121/p calls: invalid kfunc call: ptr_to_mem to struct with FAM FAIL #122/p calls: invalid kfunc call: reg->type != PTR_TO_CTX FAIL #123/p calls: invalid kfunc call: void * not allowed in func proto without mem size arg FAIL #124/p calls: trigger reg2btf_ids[reg->type] for reg->type > __BPF_REG_TYPE_MAX FAIL #125/p calls: invalid kfunc call: reg->off must be zero when passed to release kfunc FAIL #126/p calls: invalid kfunc call: don't match first member type when passed to release kfunc FAIL #127/p calls: invalid kfunc call: PTR_TO_BTF_ID with negative offset FAIL #128/p calls: invalid kfunc call: PTR_TO_BTF_ID with variable offset FAIL #129/p calls: invalid kfunc call: referenced arg needs refcounted PTR_TO_BTF_ID FAIL #130/p calls: valid kfunc call: referenced arg needs refcounted PTR_TO_BTF_ID FAIL #486/p map_kptr: ref: reference state created and released on xchg FAIL This is because the kfuncs in the loaded module are far away from __bpf_call_base: ffff800002009440 t bpf_kfunc_call_test_fail1 [bpf_testmod] 9000000002e128d8 T __bpf_call_base The offset relative to __bpf_call_base does NOT fit in s32, which breaks the assumption in BPF core. Enable bpf_jit_supports_far_kfunc_call() lifts this limit. Note that to reproduce the above result, tools/testing/selftests/bpf/config should be applied, and run the test with JIT enabled, unpriv BPF enabled. With this change, the test_verifier tests now all passed: # ./test_verifier ... Summary: 777 PASSED, 0 SKIPPED, 0 FAILED Tested-by: Tiezhu Yang <[email protected]> Signed-off-by: Hengqi Chen <[email protected]> Signed-off-by: Huacai Chen <[email protected]>
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