riscv: errata: andes: Probe for IOCP only once in boot stage
[ Upstream commit
ed5b7cfd7839f9280a63365c1133482b42d0981f ]
We need to probe for IOCP only once during boot stage, as we were probing
for IOCP for all the stages this caused the below issue during module-init
stage,
[9.019104] Unable to handle kernel paging request at virtual address
ffffffff8100d3a0
[9.027153] Oops [#1]
[9.029421] Modules linked in: rcar_canfd renesas_usbhs i2c_riic can_dev spi_rspi i2c_core
[9.037686] CPU: 0 PID: 90 Comm: udevd Not tainted 6.7.0-rc1+ #57
[9.043756] Hardware name: Renesas SMARC EVK based on r9a07g043f01 (DT)
[9.050339] epc : riscv_noncoherent_supported+0x10/0x3e
[9.055558] ra : andes_errata_patch_func+0x4a/0x52
[9.060418] epc :
ffffffff8000d8c2 ra :
ffffffff8000d95c sp :
ffffffc8003abb00
[9.067607] gp :
ffffffff814e25a0 tp :
ffffffd80361e540 t0 :
0000000000000000
[9.074795] t1 :
000000000900031e t2 :
0000000000000001 s0 :
ffffffc8003abb20
[9.081984] s1 :
ffffffff015b57c7 a0 :
0000000000000000 a1 :
0000000000000001
[9.089172] a2 :
0000000000000000 a3 :
0000000000000000 a4 :
ffffffff8100d8be
[9.096360] a5 :
0000000000000001 a6 :
0000000000000001 a7 :
000000000900031e
[9.103548] s2 :
ffffffff015b57d7 s3 :
0000000000000001 s4 :
000000000000031e
[9.110736] s5 :
8000000000008a45 s6 :
0000000000000500 s7 :
000000000000003f
[9.117924] s8 :
ffffffc8003abd48 s9 :
ffffffff015b1140 s10:
ffffffff8151a1b0
[9.125113] s11:
ffffffff015b1000 t3 :
0000000000000001 t4 :
fefefefefefefeff
[9.132301] t5 :
ffffffff015b57c7 t6 :
ffffffd8b63a6000
[9.137587] status:
0000000200000120 badaddr:
ffffffff8100d3a0 cause:
000000000000000f
[9.145468] [<
ffffffff8000d8c2>] riscv_noncoherent_supported+0x10/0x3e
[9.151972] [<
ffffffff800027e8>] _apply_alternatives+0x84/0x86
[9.157784] [<
ffffffff800029be>] apply_module_alternatives+0x10/0x1a
[9.164113] [<
ffffffff80008fcc>] module_finalize+0x5e/0x7a
[9.169583] [<
ffffffff80085cd6>] load_module+0xfd8/0x179c
[9.174965] [<
ffffffff80086630>] init_module_from_file+0x76/0xaa
[9.180948] [<
ffffffff800867f6>] __riscv_sys_finit_module+0x176/0x2a8
[9.187365] [<
ffffffff80889862>] do_trap_ecall_u+0xbe/0x130
[9.192922] [<
ffffffff808920bc>] ret_from_exception+0x0/0x64
[9.198573] Code: 0009 b7e9 6797 014d a783 85a7 c799 4785 0717 0100 (0123) aef7
[9.205994] ---[ end trace
0000000000000000 ]---
This is because we called riscv_noncoherent_supported() for all the stages
during IOCP probe. riscv_noncoherent_supported() function sets
noncoherent_supported variable to true which has an annotation set to
"__ro_after_init" due to which we were seeing the above splat. Fix this by
probing for IOCP only once in boot stage by having a boolean variable
"done" which will be set to true upon IOCP probe in errata_probe_iocp()
and we bail out early if "done" is set to true.
While at it make return type of errata_probe_iocp() to void as we were
not checking the return value in andes_errata_patch_func().
Fixes:
e021ae7f5145 ("riscv: errata: Add Andes alternative ports")
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Yu Chien Peter Lin <peterlin@andestech.com>
Link: https://lore.kernel.org/r/20231130212647.108746-1-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>