From: mark gross <mgross@linux.intel.com>
To: Borislav Petkov <bp@alien8.de>
Cc: X86 ML <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 3/3] x86/apic: Convert the TSC deadline timer matching to steppings macro
Date: Wed, 6 May 2020 08:00:42 -0700 [thread overview]
Message-ID: <20200506150042.GA2961@mtg-dev.jf.intel.com> (raw)
In-Reply-To: <20200506071516.25445-4-bp@alien8.de>
Reviewed-by: Mark Gross <mgross.linux.intel.com>
On Wed, May 06, 2020 at 09:15:16AM +0200, Borislav Petkov wrote:
> From: Borislav Petkov <bp@suse.de>
>
> ... and get rid of the function pointers which would spit out the
> microcode revision based on the CPU stepping.
>
> Signed-off-by: Borislav Petkov <bp@suse.de>
> Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
> ---
> arch/x86/kernel/apic/apic.c | 57 ++++++++-----------------------------
> 1 file changed, 12 insertions(+), 45 deletions(-)
>
> diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
> index e53dda210cd7..4b1d31be50b4 100644
> --- a/arch/x86/kernel/apic/apic.c
> +++ b/arch/x86/kernel/apic/apic.c
> @@ -544,46 +544,20 @@ static struct clock_event_device lapic_clockevent = {
> };
> static DEFINE_PER_CPU(struct clock_event_device, lapic_events);
>
> -static __init u32 hsx_deadline_rev(void)
> -{
> - switch (boot_cpu_data.x86_stepping) {
> - case 0x02: return 0x3a; /* EP */
> - case 0x04: return 0x0f; /* EX */
> - }
> -
> - return ~0U;
> -}
> -
> -static __init u32 bdx_deadline_rev(void)
> -{
> - switch (boot_cpu_data.x86_stepping) {
> - case 0x02: return 0x00000011;
> - case 0x03: return 0x0700000e;
> - case 0x04: return 0x0f00000c;
> - case 0x05: return 0x0e000003;
> - }
> -
> - return ~0U;
> -}
> -
> -static __init u32 skx_deadline_rev(void)
> -{
> - switch (boot_cpu_data.x86_stepping) {
> - case 0x03: return 0x01000136;
> - case 0x04: return 0x02000014;
> - }
> +static const struct x86_cpu_id deadline_match[] __initconst = {
> + X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(HASWELL_X, X86_STEPPINGS(0x2, 0x2), 0x3a), /* EP */
> + X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(HASWELL_X, X86_STEPPINGS(0x4, 0x4), 0x0f), /* EX */
>
> - if (boot_cpu_data.x86_stepping > 4)
> - return 0;
> + X86_MATCH_INTEL_FAM6_MODEL( BROADWELL_X, 0x0b000020),
>
> - return ~0U;
> -}
> + X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(BROADWELL_D, X86_STEPPINGS(0x2, 0x2), 0x00000011),
> + X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(BROADWELL_D, X86_STEPPINGS(0x3, 0x3), 0x0700000e),
> + X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(BROADWELL_D, X86_STEPPINGS(0x4, 0x4), 0x0f00000c),
> + X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(BROADWELL_D, X86_STEPPINGS(0x5, 0x5), 0x0e000003),
>
> -static const struct x86_cpu_id deadline_match[] __initconst = {
> - X86_MATCH_INTEL_FAM6_MODEL( HASWELL_X, &hsx_deadline_rev),
> - X86_MATCH_INTEL_FAM6_MODEL( BROADWELL_X, 0x0b000020),
> - X86_MATCH_INTEL_FAM6_MODEL( BROADWELL_D, &bdx_deadline_rev),
> - X86_MATCH_INTEL_FAM6_MODEL( SKYLAKE_X, &skx_deadline_rev),
> + X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(SKYLAKE_X, X86_STEPPINGS(0x3, 0x3), 0x01000136),
> + X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(SKYLAKE_X, X86_STEPPINGS(0x4, 0x4), 0x02000014),
> + X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(SKYLAKE_X, X86_STEPPINGS(0x5, 0xf), 0),
>
> X86_MATCH_INTEL_FAM6_MODEL( HASWELL, 0x22),
> X86_MATCH_INTEL_FAM6_MODEL( HASWELL_L, 0x20),
> @@ -615,14 +589,7 @@ static __init bool apic_validate_deadline_timer(void)
> if (!m)
> return true;
>
> - /*
> - * Function pointers will have the MSB set due to address layout,
> - * immediate revisions will not.
> - */
> - if ((long)m->driver_data < 0)
> - rev = ((u32 (*)(void))(m->driver_data))();
> - else
> - rev = (u32)m->driver_data;
> + rev = (u32)m->driver_data;
>
> if (boot_cpu_data.microcode >= rev)
> return true;
> --
> 2.21.0
>
next prev parent reply other threads:[~2020-05-06 15:00 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-06 7:15 [PATCH 0/3] x86/cpu: More macros cleanup Borislav Petkov
2020-05-06 7:15 ` [PATCH 1/3] x86/cpu: Add a steppings field to struct x86_cpu_id Borislav Petkov
2020-05-06 15:02 ` mark gross
2020-05-06 7:15 ` [PATCH 2/3] x86/cpu: Add a X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS() macro Borislav Petkov
2020-05-06 15:01 ` mark gross
2020-05-07 15:51 ` [tip: x86/cpu] " tip-bot2 for Borislav Petkov
2020-05-06 7:15 ` [PATCH 3/3] x86/apic: Convert the TSC deadline timer matching to steppings macro Borislav Petkov
2020-05-06 15:00 ` mark gross [this message]
2020-05-07 15:51 ` [tip: x86/cpu] " tip-bot2 for Borislav Petkov
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