mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 19:26:40 +07:00
97f2645f35
The use of config_enabled() against config options is ambiguous. In practical terms, config_enabled() is equivalent to IS_BUILTIN(), but the author might have used it for the meaning of IS_ENABLED(). Using IS_ENABLED(), IS_BUILTIN(), IS_MODULE() etc. makes the intention clearer. This commit replaces config_enabled() with IS_ENABLED() where possible. This commit is only touching bool config options. I noticed two cases where config_enabled() is used against a tristate option: - config_enabled(CONFIG_HWMON) [ drivers/net/wireless/ath/ath10k/thermal.c ] - config_enabled(CONFIG_BACKLIGHT_CLASS_DEVICE) [ drivers/gpu/drm/gma500/opregion.c ] I did not touch them because they should be converted to IS_BUILTIN() in order to keep the logic, but I was not sure it was the authors' intention. Link: http://lkml.kernel.org/r/1465215656-20569-1-git-send-email-yamada.masahiro@socionext.com Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Kees Cook <keescook@chromium.org> Cc: Stas Sergeev <stsp@list.ru> Cc: Matt Redfearn <matt.redfearn@imgtec.com> Cc: Joshua Kinard <kumba@gentoo.org> Cc: Jiri Slaby <jslaby@suse.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Borislav Petkov <bp@suse.de> Cc: Markos Chandras <markos.chandras@imgtec.com> Cc: "Dmitry V. Levin" <ldv@altlinux.org> Cc: yu-cheng yu <yu-cheng.yu@intel.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: Brian Gerst <brgerst@gmail.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Will Drewry <wad@chromium.org> Cc: Nikolay Martynov <mar.kolya@gmail.com> Cc: Huacai Chen <chenhc@lemote.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> Cc: Rafal Milecki <zajec5@gmail.com> Cc: James Cowgill <James.Cowgill@imgtec.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Alex Smith <alex.smith@imgtec.com> Cc: Adam Buchbinder <adam.buchbinder@gmail.com> Cc: Qais Yousef <qais.yousef@imgtec.com> Cc: Jiang Liu <jiang.liu@linux.intel.com> Cc: Mikko Rapeli <mikko.rapeli@iki.fi> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Brian Norris <computersforpeace@gmail.com> Cc: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> Cc: "Luis R. Rodriguez" <mcgrof@do-not-panic.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Ingo Molnar <mingo@redhat.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Roland McGrath <roland@hack.frob.com> Cc: Paul Burton <paul.burton@imgtec.com> Cc: Kalle Valo <kvalo@qca.qualcomm.com> Cc: Viresh Kumar <viresh.kumar@linaro.org> Cc: Tony Wu <tung7970@gmail.com> Cc: Huaitong Han <huaitong.han@intel.com> Cc: Sumit Semwal <sumit.semwal@linaro.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Juergen Gross <jgross@suse.com> Cc: Jason Cooper <jason@lakedaemon.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Andrea Gelmini <andrea.gelmini@gelma.net> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Rabin Vincent <rabin@rab.in> Cc: "Maciej W. Rozycki" <macro@imgtec.com> Cc: David Daney <david.daney@cavium.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
328 lines
7.7 KiB
C
328 lines
7.7 KiB
C
/*
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* Copyright (C) 2003, 2004, 2007 Maciej W. Rozycki
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/context_tracking.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/ptrace.h>
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#include <linux/stddef.h>
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#include <asm/bugs.h>
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#include <asm/compiler.h>
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#include <asm/cpu.h>
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#include <asm/fpu.h>
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#include <asm/mipsregs.h>
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#include <asm/setup.h>
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static char bug64hit[] __initdata =
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"reliable operation impossible!\n%s";
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static char nowar[] __initdata =
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"Please report to <linux-mips@linux-mips.org>.";
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static char r4kwar[] __initdata =
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"Enable CPU_R4000_WORKAROUNDS to rectify.";
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static char daddiwar[] __initdata =
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"Enable CPU_DADDI_WORKAROUNDS to rectify.";
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static inline void align_mod(const int align, const int mod)
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{
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asm volatile(
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".set push\n\t"
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".set noreorder\n\t"
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".balign %0\n\t"
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".rept %1\n\t"
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"nop\n\t"
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".endr\n\t"
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".set pop"
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:
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: GCC_IMM_ASM() (align), GCC_IMM_ASM() (mod));
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}
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static inline void mult_sh_align_mod(long *v1, long *v2, long *w,
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const int align, const int mod)
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{
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unsigned long flags;
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int m1, m2;
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long p, s, lv1, lv2, lw;
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/*
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* We want the multiply and the shift to be isolated from the
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* rest of the code to disable gcc optimizations. Hence the
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* asm statements that execute nothing, but make gcc not know
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* what the values of m1, m2 and s are and what lv2 and p are
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* used for.
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*/
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local_irq_save(flags);
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/*
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* The following code leads to a wrong result of the first
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* dsll32 when executed on R4000 rev. 2.2 or 3.0 (PRId
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* 00000422 or 00000430, respectively).
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*
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* See "MIPS R4000PC/SC Errata, Processor Revision 2.2 and
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* 3.0" by MIPS Technologies, Inc., errata #16 and #28 for
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* details. I got no permission to duplicate them here,
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* sigh... --macro
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*/
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asm volatile(
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""
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: "=r" (m1), "=r" (m2), "=r" (s)
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: "0" (5), "1" (8), "2" (5));
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align_mod(align, mod);
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/*
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* The trailing nop is needed to fulfill the two-instruction
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* requirement between reading hi/lo and staring a mult/div.
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* Leaving it out may cause gas insert a nop itself breaking
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* the desired alignment of the next chunk.
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*/
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asm volatile(
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".set push\n\t"
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".set noat\n\t"
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".set noreorder\n\t"
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".set nomacro\n\t"
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"mult %2, %3\n\t"
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"dsll32 %0, %4, %5\n\t"
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"mflo $0\n\t"
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"dsll32 %1, %4, %5\n\t"
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"nop\n\t"
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".set pop"
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: "=&r" (lv1), "=r" (lw)
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: "r" (m1), "r" (m2), "r" (s), "I" (0)
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: "hi", "lo", GCC_REG_ACCUM);
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/* We have to use single integers for m1 and m2 and a double
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* one for p to be sure the mulsidi3 gcc's RTL multiplication
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* instruction has the workaround applied. Older versions of
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* gcc have correct umulsi3 and mulsi3, but other
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* multiplication variants lack the workaround.
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*/
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asm volatile(
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""
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: "=r" (m1), "=r" (m2), "=r" (s)
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: "0" (m1), "1" (m2), "2" (s));
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align_mod(align, mod);
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p = m1 * m2;
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lv2 = s << 32;
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asm volatile(
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""
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: "=r" (lv2)
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: "0" (lv2), "r" (p));
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local_irq_restore(flags);
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*v1 = lv1;
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*v2 = lv2;
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*w = lw;
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}
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static inline void check_mult_sh(void)
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{
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long v1[8], v2[8], w[8];
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int bug, fix, i;
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printk("Checking for the multiply/shift bug... ");
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/*
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* Testing discovered false negatives for certain code offsets
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* into cache lines. Hence we test all possible offsets for
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* the worst assumption of an R4000 I-cache line width of 32
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* bytes.
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*
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* We can't use a loop as alignment directives need to be
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* immediates.
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*/
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mult_sh_align_mod(&v1[0], &v2[0], &w[0], 32, 0);
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mult_sh_align_mod(&v1[1], &v2[1], &w[1], 32, 1);
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mult_sh_align_mod(&v1[2], &v2[2], &w[2], 32, 2);
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mult_sh_align_mod(&v1[3], &v2[3], &w[3], 32, 3);
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mult_sh_align_mod(&v1[4], &v2[4], &w[4], 32, 4);
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mult_sh_align_mod(&v1[5], &v2[5], &w[5], 32, 5);
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mult_sh_align_mod(&v1[6], &v2[6], &w[6], 32, 6);
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mult_sh_align_mod(&v1[7], &v2[7], &w[7], 32, 7);
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bug = 0;
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for (i = 0; i < 8; i++)
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if (v1[i] != w[i])
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bug = 1;
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if (bug == 0) {
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printk("no.\n");
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return;
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}
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printk("yes, workaround... ");
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fix = 1;
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for (i = 0; i < 8; i++)
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if (v2[i] != w[i])
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fix = 0;
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if (fix == 1) {
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printk("yes.\n");
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return;
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}
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printk("no.\n");
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panic(bug64hit, !R4000_WAR ? r4kwar : nowar);
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}
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static volatile int daddi_ov;
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asmlinkage void __init do_daddi_ov(struct pt_regs *regs)
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{
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enum ctx_state prev_state;
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prev_state = exception_enter();
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daddi_ov = 1;
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regs->cp0_epc += 4;
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exception_exit(prev_state);
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}
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static inline void check_daddi(void)
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{
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extern asmlinkage void handle_daddi_ov(void);
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unsigned long flags;
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void *handler;
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long v, tmp;
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printk("Checking for the daddi bug... ");
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local_irq_save(flags);
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handler = set_except_vector(EXCCODE_OV, handle_daddi_ov);
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/*
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* The following code fails to trigger an overflow exception
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* when executed on R4000 rev. 2.2 or 3.0 (PRId 00000422 or
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* 00000430, respectively).
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*
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* See "MIPS R4000PC/SC Errata, Processor Revision 2.2 and
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* 3.0" by MIPS Technologies, Inc., erratum #23 for details.
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* I got no permission to duplicate it here, sigh... --macro
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*/
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asm volatile(
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".set push\n\t"
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".set noat\n\t"
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".set noreorder\n\t"
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".set nomacro\n\t"
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"addiu %1, $0, %2\n\t"
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"dsrl %1, %1, 1\n\t"
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#ifdef HAVE_AS_SET_DADDI
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".set daddi\n\t"
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#endif
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"daddi %0, %1, %3\n\t"
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".set pop"
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: "=r" (v), "=&r" (tmp)
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: "I" (0xffffffffffffdb9aUL), "I" (0x1234));
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set_except_vector(EXCCODE_OV, handler);
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local_irq_restore(flags);
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if (daddi_ov) {
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printk("no.\n");
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return;
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}
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printk("yes, workaround... ");
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local_irq_save(flags);
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handler = set_except_vector(EXCCODE_OV, handle_daddi_ov);
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asm volatile(
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"addiu %1, $0, %2\n\t"
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"dsrl %1, %1, 1\n\t"
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"daddi %0, %1, %3"
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: "=r" (v), "=&r" (tmp)
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: "I" (0xffffffffffffdb9aUL), "I" (0x1234));
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set_except_vector(EXCCODE_OV, handler);
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local_irq_restore(flags);
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if (daddi_ov) {
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printk("yes.\n");
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return;
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}
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printk("no.\n");
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panic(bug64hit, !DADDI_WAR ? daddiwar : nowar);
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}
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int daddiu_bug = IS_ENABLED(CONFIG_CPU_MIPSR6) ? 0 : -1;
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static inline void check_daddiu(void)
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{
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long v, w, tmp;
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printk("Checking for the daddiu bug... ");
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/*
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* The following code leads to a wrong result of daddiu when
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* executed on R4400 rev. 1.0 (PRId 00000440).
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*
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* See "MIPS R4400PC/SC Errata, Processor Revision 1.0" by
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* MIPS Technologies, Inc., erratum #7 for details.
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*
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* According to "MIPS R4000PC/SC Errata, Processor Revision
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* 2.2 and 3.0" by MIPS Technologies, Inc., erratum #41 this
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* problem affects R4000 rev. 2.2 and 3.0 (PRId 00000422 and
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* 00000430, respectively), too. Testing failed to trigger it
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* so far.
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*
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* I got no permission to duplicate the errata here, sigh...
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* --macro
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*/
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asm volatile(
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".set push\n\t"
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".set noat\n\t"
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".set noreorder\n\t"
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".set nomacro\n\t"
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"addiu %2, $0, %3\n\t"
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"dsrl %2, %2, 1\n\t"
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#ifdef HAVE_AS_SET_DADDI
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".set daddi\n\t"
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#endif
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"daddiu %0, %2, %4\n\t"
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"addiu %1, $0, %4\n\t"
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"daddu %1, %2\n\t"
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".set pop"
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: "=&r" (v), "=&r" (w), "=&r" (tmp)
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: "I" (0xffffffffffffdb9aUL), "I" (0x1234));
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daddiu_bug = v != w;
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if (!daddiu_bug) {
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printk("no.\n");
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return;
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}
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printk("yes, workaround... ");
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asm volatile(
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"addiu %2, $0, %3\n\t"
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"dsrl %2, %2, 1\n\t"
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"daddiu %0, %2, %4\n\t"
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"addiu %1, $0, %4\n\t"
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"daddu %1, %2"
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: "=&r" (v), "=&r" (w), "=&r" (tmp)
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: "I" (0xffffffffffffdb9aUL), "I" (0x1234));
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if (v == w) {
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printk("yes.\n");
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return;
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}
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printk("no.\n");
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panic(bug64hit, !DADDI_WAR ? daddiwar : nowar);
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}
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void __init check_bugs64_early(void)
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{
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if (!IS_ENABLED(CONFIG_CPU_MIPSR6)) {
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check_mult_sh();
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check_daddiu();
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}
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}
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void __init check_bugs64(void)
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{
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if (!IS_ENABLED(CONFIG_CPU_MIPSR6))
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check_daddi();
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}
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