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drivers: perf: ctr_get_width function for legacy is not defined #315

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drivers: perf: ctr_get_width function for legacy is not defined #315

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@bjoto bjoto commented Nov 27, 2023

Pull request for series with
subject: drivers: perf: ctr_get_width function for legacy is not defined
version: 1
url: https://patchwork.kernel.org/project/linux-riscv/list/?series=804441

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bjoto commented Nov 27, 2023

Upstream branch: 3ca112b
series: https://patchwork.kernel.org/project/linux-riscv/list/?series=804441
version: 1

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bjoto commented Dec 5, 2023

Upstream branch: 3ca112b
series: https://patchwork.kernel.org/project/linux-riscv/list/?series=806945
version: 1

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bjoto commented Dec 6, 2023

Upstream branch: b85ea95
series: https://patchwork.kernel.org/project/linux-riscv/list/?series=806945
version: 1

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bjoto commented Dec 12, 2023

Upstream branch: 6c31291
series: https://patchwork.kernel.org/project/linux-riscv/list/?series=806945
version: 1

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bjoto commented Dec 12, 2023

Upstream branch: f352a28
series: https://patchwork.kernel.org/project/linux-riscv/list/?series=806945
version: 1

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bjoto commented Jan 5, 2024

Upstream branch: f352a28
series: https://patchwork.kernel.org/project/linux-riscv/list/?series=806945
version: 1

@vdsh-sc
drivers: perf: ctr_get_width function for legacy is not defined
20ba03d 
With parameters CONFIG_RISCV_PMU_LEGACY=y and CONFIG_RISCV_PMU_SBI=n
linux kernel crashes when you try perf record:

$ perf record ls
[   46.749286] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
[   46.750199] Oops [#1]
[   46.750342] Modules linked in:
[   46.750608] CPU: 0 PID: 107 Comm: perf-exec Not tainted 6.6.0 #2
[   46.750906] Hardware name: riscv-virtio,qemu (DT)
[   46.751184] epc : 0x0
[   46.751430]  ra : arch_perf_update_userpage+0x54/0x13e
[   46.751680] epc : 0000000000000000 ra : ffffffff8072ee52 sp : ff2000000022b8f0
[   46.751958]  gp : ffffffff81505988 tp : ff6000000290d400 t0 : ff2000000022b9c0
[   46.752229]  t1 : 0000000000000001 t2 : 0000000000000003 s0 : ff2000000022b930
[   46.752451]  s1 : ff600000028fb000 a0 : 0000000000000000 a1 : ff600000028fb000
[   46.752673]  a2 : 0000000ae2751268 a3 : 00000000004fb708 a4 : 0000000000000004
[   46.752895]  a5 : 0000000000000000 a6 : 000000000017ffe3 a7 : 00000000000000d2
[   46.753117]  s2 : ff600000028fb000 s3 : 0000000ae2751268 s4 : 0000000000000000
[   46.753338]  s5 : ffffffff8153e290 s6 : ff600000863b9000 s7 : ff60000002961078
[   46.753562]  s8 : ff60000002961048 s9 : ff60000002961058 s10: 0000000000000001
[   46.753783]  s11: 0000000000000018 t3 : ffffffffffffffff t4 : ffffffffffffffff
[   46.754005]  t5 : ff6000000292270c t6 : ff2000000022bb30
[   46.754179] status: 0000000200000100 badaddr: 0000000000000000 cause: 000000000000000c
[   46.754653] Code: Unable to access instruction at 0xffffffffffffffec.
[   46.754939] ---[ end trace 0000000000000000 ]---
[   46.755131] note: perf-exec[107] exited with irqs disabled
[   46.755546] note: perf-exec[107] exited with preempt_count 4

This happens because in the legacy case the ctr_get_width function was not
defined, but it is used in arch_perf_update_userpage.

Also remove extra check in riscv_pmu_ctr_get_width_mask

Fixes: cc4c07c ("drivers: perf: Implement perf event mmap support in the SBI backend")
Signed-off-by: Vadim Shakirov <vadim.shakirov@syntacore.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
@vdsh-sc
drivers: perf: added capabilities for legacy PMU
9daef53 
Added the PERF_PMU_CAP_NO_INTERRUPT flag because the legacy pmu driver
does not provide sampling capabilities

Added the PERF_PMU_CAP_NO_EXCLUDE flag because the legacy pmu driver
does not provide the ability to disable counter incrementation in
different privilege modes

Suggested-by: Atish Patra <atishp@atishpatra.org>
Signed-off-by: Vadim Shakirov <vadim.shakirov@syntacore.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
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bjoto commented Jan 5, 2024

Upstream branch: 5a2cf77
series: https://patchwork.kernel.org/project/linux-riscv/list/?series=806945
version: 1

@bjoto bjoto closed this Jan 8, 2024
@bjoto bjoto deleted the series/804441=>for-next branch January 10, 2024 19:08
bjoto pushed a commit that referenced this pull request Mar 29, 2024
@sm00th
arm64: bpf: fix 32bit unconditional bswap
a51cd6b 
In case when is64 == 1 in emit(A64_REV32(is64, dst, dst), ctx) the
generated insn reverses byte order for both high and low 32-bit words,
resuling in an incorrect swap as indicated by the jit test:

[ 9757.262607] test_bpf: #312 BSWAP 16: 0x0123456789abcdef -> 0xefcd jited:1 8 PASS
[ 9757.264435] test_bpf: #313 BSWAP 32: 0x0123456789abcdef -> 0xefcdab89 jited:1 ret 1460850314 != -271733879 (0x5712ce8a != 0xefcdab89)FAIL (1 times)
[ 9757.266260] test_bpf: #314 BSWAP 64: 0x0123456789abcdef -> 0x67452301 jited:1 8 PASS
[ 9757.268000] test_bpf: #315 BSWAP 64: 0x0123456789abcdef >> 32 -> 0xefcdab89 jited:1 8 PASS
[ 9757.269686] test_bpf: #316 BSWAP 16: 0xfedcba9876543210 -> 0x1032 jited:1 8 PASS
[ 9757.271380] test_bpf: #317 BSWAP 32: 0xfedcba9876543210 -> 0x10325476 jited:1 ret -1460850316 != 271733878 (0xa8ed3174 != 0x10325476)FAIL (1 times)
[ 9757.273022] test_bpf: #318 BSWAP 64: 0xfedcba9876543210 -> 0x98badcfe jited:1 7 PASS
[ 9757.274721] test_bpf: #319 BSWAP 64: 0xfedcba9876543210 >> 32 -> 0x10325476 jited:1 9 PASS

Fix this by forcing 32bit variant of rev32.

Fixes: 1104247 ("bpf, arm64: Support unconditional bswap")
Signed-off-by: Artem Savkov <asavkov@redhat.com>
Tested-by: Puranjay Mohan <puranjay12@gmail.com>
Acked-by: Puranjay Mohan <puranjay12@gmail.com>
Acked-by: Xu Kuohai <xukuohai@huawei.com>
Message-ID: <20240321081809.158803-1-asavkov@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
bjoto pushed a commit that referenced this pull request May 17, 2024
@chleroy @mpe
powerpc/bpf/32: Fix failing test_bpf tests
8ecf3c1 
Recent additions in BPF like cpu v4 instructions, test_bpf module
exhibits the following failures:

  test_bpf: #82 ALU_MOVSX | BPF_B jited:1 ret 2 != 1 (0x2 != 0x1)FAIL (1 times)
  test_bpf: #83 ALU_MOVSX | BPF_H jited:1 ret 2 != 1 (0x2 != 0x1)FAIL (1 times)
  test_bpf: #84 ALU64_MOVSX | BPF_B jited:1 ret 2 != 1 (0x2 != 0x1)FAIL (1 times)
  test_bpf: #85 ALU64_MOVSX | BPF_H jited:1 ret 2 != 1 (0x2 != 0x1)FAIL (1 times)
  test_bpf: #86 ALU64_MOVSX | BPF_W jited:1 ret 2 != 1 (0x2 != 0x1)FAIL (1 times)

  test_bpf: #165 ALU_SDIV_X: -6 / 2 = -3 jited:1 ret 2147483645 != -3 (0x7ffffffd != 0xfffffffd)FAIL (1 times)
  test_bpf: #166 ALU_SDIV_K: -6 / 2 = -3 jited:1 ret 2147483645 != -3 (0x7ffffffd != 0xfffffffd)FAIL (1 times)

  test_bpf: #169 ALU_SMOD_X: -7 % 2 = -1 jited:1 ret 1 != -1 (0x1 != 0xffffffff)FAIL (1 times)
  test_bpf: #170 ALU_SMOD_K: -7 % 2 = -1 jited:1 ret 1 != -1 (0x1 != 0xffffffff)FAIL (1 times)

  test_bpf: #172 ALU64_SMOD_K: -7 % 2 = -1 jited:1 ret 1 != -1 (0x1 != 0xffffffff)FAIL (1 times)

  test_bpf: #313 BSWAP 16: 0x0123456789abcdef -> 0xefcd
  eBPF filter opcode 00d7 (@2) unsupported
  jited:0 301 PASS
  test_bpf: #314 BSWAP 32: 0x0123456789abcdef -> 0xefcdab89
  eBPF filter opcode 00d7 (@2) unsupported
  jited:0 555 PASS
  test_bpf: #315 BSWAP 64: 0x0123456789abcdef -> 0x67452301
  eBPF filter opcode 00d7 (@2) unsupported
  jited:0 268 PASS
  test_bpf: #316 BSWAP 64: 0x0123456789abcdef >> 32 -> 0xefcdab89
  eBPF filter opcode 00d7 (@2) unsupported
  jited:0 269 PASS
  test_bpf: #317 BSWAP 16: 0xfedcba9876543210 -> 0x1032
  eBPF filter opcode 00d7 (@2) unsupported
  jited:0 460 PASS
  test_bpf: #318 BSWAP 32: 0xfedcba9876543210 -> 0x10325476
  eBPF filter opcode 00d7 (@2) unsupported
  jited:0 320 PASS
  test_bpf: #319 BSWAP 64: 0xfedcba9876543210 -> 0x98badcfe
  eBPF filter opcode 00d7 (@2) unsupported
  jited:0 222 PASS
  test_bpf: #320 BSWAP 64: 0xfedcba9876543210 >> 32 -> 0x10325476
  eBPF filter opcode 00d7 (@2) unsupported
  jited:0 273 PASS

  test_bpf: #344 BPF_LDX_MEMSX | BPF_B
  eBPF filter opcode 0091 (@5) unsupported
  jited:0 432 PASS
  test_bpf: #345 BPF_LDX_MEMSX | BPF_H
  eBPF filter opcode 0089 (@5) unsupported
  jited:0 381 PASS
  test_bpf: #346 BPF_LDX_MEMSX | BPF_W
  eBPF filter opcode 0081 (@5) unsupported
  jited:0 505 PASS

  test_bpf: #490 JMP32_JA: Unconditional jump: if (true) return 1
  eBPF filter opcode 0006 (@1) unsupported
  jited:0 261 PASS

  test_bpf: Summary: 1040 PASSED, 10 FAILED, [924/1038 JIT'ed]

Fix them by adding missing processing.

Fixes: daabb2b ("bpf/tests: add tests for cpuv4 instructions")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/91de862dda99d170697eb79ffb478678af7e0b27.1709652689.git.christophe.leroy@csgroup.eu
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