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Date: Fri, 3 Nov 2023 15:16:38 -0500
From: Steve Wahl <steve.wahl@....com>
To: Andrew Cooper <andrew.cooper3@...rix.com>
Cc: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>, Steve Wahl <steve.wahl@....com>,
Justin Ernst <justin.ernst@....com>,
Kyle Meyer <kyle.meyer@....com>,
Dimitri Sivanich <dimitri.sivanich@....com>,
Russ Anderson <russ.anderson@....com>,
Darren Hart <dvhart@...radead.org>,
Andy Shevchenko <andy@...radead.org>,
"K. Y. Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Krzysztof Wilczyński <kw@...ux.com>,
Rob Herring <robh@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
linux-hyperv@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 3/3] x86/apic: Drop struct local_apic
On Thu, Nov 02, 2023 at 12:26:21PM +0000, Andrew Cooper wrote:
> This type predates recorded history in tglx/history.git, making it older
> than Feb 5th 2002.
>
> This structure is literally old enough to drink in most juristictions in
> the world, and has not been used once in that time.
>
> Lay it to rest in /dev/null.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@...rix.com>
> ---
> There is perhaps something to be said for the longevity of the comment.
> "Not terribly well tested" certainly hasn't bitrotted in all this time.
:-) !!!
Reveiewed-by: Steve Wahl <steve.wahl@....com>
> ---
> arch/x86/include/asm/apicdef.h | 260 -----------------------------------------
> 1 file changed, 260 deletions(-)
>
> diff --git a/arch/x86/include/asm/apicdef.h b/arch/x86/include/asm/apicdef.h
> index ddcbf00db19d..094106b6a538 100644
> --- a/arch/x86/include/asm/apicdef.h
> +++ b/arch/x86/include/asm/apicdef.h
> @@ -172,270 +172,10 @@
> #define APIC_CPUID(apicid) ((apicid) & XAPIC_DEST_CPUS_MASK)
> #define NUM_APIC_CLUSTERS ((BAD_APICID + 1) >> XAPIC_DEST_CPUS_SHIFT)
>
> -#ifndef __ASSEMBLY__
> -/*
> - * the local APIC register structure, memory mapped. Not terribly well
> - * tested, but we might eventually use this one in the future - the
> - * problem why we cannot use it right now is the P5 APIC, it has an
> - * errata which cannot take 8-bit reads and writes, only 32-bit ones ...
> - */
> -#define u32 unsigned int
> -
> -struct local_apic {
> -
> -/*000*/ struct { u32 __reserved[4]; } __reserved_01;
> -
> -/*010*/ struct { u32 __reserved[4]; } __reserved_02;
> -
> -/*020*/ struct { /* APIC ID Register */
> - u32 __reserved_1 : 24,
> - phys_apic_id : 4,
> - __reserved_2 : 4;
> - u32 __reserved[3];
> - } id;
> -
> -/*030*/ const
> - struct { /* APIC Version Register */
> - u32 version : 8,
> - __reserved_1 : 8,
> - max_lvt : 8,
> - __reserved_2 : 8;
> - u32 __reserved[3];
> - } version;
> -
> -/*040*/ struct { u32 __reserved[4]; } __reserved_03;
> -
> -/*050*/ struct { u32 __reserved[4]; } __reserved_04;
> -
> -/*060*/ struct { u32 __reserved[4]; } __reserved_05;
> -
> -/*070*/ struct { u32 __reserved[4]; } __reserved_06;
> -
> -/*080*/ struct { /* Task Priority Register */
> - u32 priority : 8,
> - __reserved_1 : 24;
> - u32 __reserved_2[3];
> - } tpr;
> -
> -/*090*/ const
> - struct { /* Arbitration Priority Register */
> - u32 priority : 8,
> - __reserved_1 : 24;
> - u32 __reserved_2[3];
> - } apr;
> -
> -/*0A0*/ const
> - struct { /* Processor Priority Register */
> - u32 priority : 8,
> - __reserved_1 : 24;
> - u32 __reserved_2[3];
> - } ppr;
> -
> -/*0B0*/ struct { /* End Of Interrupt Register */
> - u32 eoi;
> - u32 __reserved[3];
> - } eoi;
> -
> -/*0C0*/ struct { u32 __reserved[4]; } __reserved_07;
> -
> -/*0D0*/ struct { /* Logical Destination Register */
> - u32 __reserved_1 : 24,
> - logical_dest : 8;
> - u32 __reserved_2[3];
> - } ldr;
> -
> -/*0E0*/ struct { /* Destination Format Register */
> - u32 __reserved_1 : 28,
> - model : 4;
> - u32 __reserved_2[3];
> - } dfr;
> -
> -/*0F0*/ struct { /* Spurious Interrupt Vector Register */
> - u32 spurious_vector : 8,
> - apic_enabled : 1,
> - focus_cpu : 1,
> - __reserved_2 : 22;
> - u32 __reserved_3[3];
> - } svr;
> -
> -/*100*/ struct { /* In Service Register */
> -/*170*/ u32 bitfield;
> - u32 __reserved[3];
> - } isr [8];
> -
> -/*180*/ struct { /* Trigger Mode Register */
> -/*1F0*/ u32 bitfield;
> - u32 __reserved[3];
> - } tmr [8];
> -
> -/*200*/ struct { /* Interrupt Request Register */
> -/*270*/ u32 bitfield;
> - u32 __reserved[3];
> - } irr [8];
> -
> -/*280*/ union { /* Error Status Register */
> - struct {
> - u32 send_cs_error : 1,
> - receive_cs_error : 1,
> - send_accept_error : 1,
> - receive_accept_error : 1,
> - __reserved_1 : 1,
> - send_illegal_vector : 1,
> - receive_illegal_vector : 1,
> - illegal_register_address : 1,
> - __reserved_2 : 24;
> - u32 __reserved_3[3];
> - } error_bits;
> - struct {
> - u32 errors;
> - u32 __reserved_3[3];
> - } all_errors;
> - } esr;
> -
> -/*290*/ struct { u32 __reserved[4]; } __reserved_08;
> -
> -/*2A0*/ struct { u32 __reserved[4]; } __reserved_09;
> -
> -/*2B0*/ struct { u32 __reserved[4]; } __reserved_10;
> -
> -/*2C0*/ struct { u32 __reserved[4]; } __reserved_11;
> -
> -/*2D0*/ struct { u32 __reserved[4]; } __reserved_12;
> -
> -/*2E0*/ struct { u32 __reserved[4]; } __reserved_13;
> -
> -/*2F0*/ struct { u32 __reserved[4]; } __reserved_14;
> -
> -/*300*/ struct { /* Interrupt Command Register 1 */
> - u32 vector : 8,
> - delivery_mode : 3,
> - destination_mode : 1,
> - delivery_status : 1,
> - __reserved_1 : 1,
> - level : 1,
> - trigger : 1,
> - __reserved_2 : 2,
> - shorthand : 2,
> - __reserved_3 : 12;
> - u32 __reserved_4[3];
> - } icr1;
> -
> -/*310*/ struct { /* Interrupt Command Register 2 */
> - union {
> - u32 __reserved_1 : 24,
> - phys_dest : 4,
> - __reserved_2 : 4;
> - u32 __reserved_3 : 24,
> - logical_dest : 8;
> - } dest;
> - u32 __reserved_4[3];
> - } icr2;
> -
> -/*320*/ struct { /* LVT - Timer */
> - u32 vector : 8,
> - __reserved_1 : 4,
> - delivery_status : 1,
> - __reserved_2 : 3,
> - mask : 1,
> - timer_mode : 1,
> - __reserved_3 : 14;
> - u32 __reserved_4[3];
> - } lvt_timer;
> -
> -/*330*/ struct { /* LVT - Thermal Sensor */
> - u32 vector : 8,
> - delivery_mode : 3,
> - __reserved_1 : 1,
> - delivery_status : 1,
> - __reserved_2 : 3,
> - mask : 1,
> - __reserved_3 : 15;
> - u32 __reserved_4[3];
> - } lvt_thermal;
> -
> -/*340*/ struct { /* LVT - Performance Counter */
> - u32 vector : 8,
> - delivery_mode : 3,
> - __reserved_1 : 1,
> - delivery_status : 1,
> - __reserved_2 : 3,
> - mask : 1,
> - __reserved_3 : 15;
> - u32 __reserved_4[3];
> - } lvt_pc;
> -
> -/*350*/ struct { /* LVT - LINT0 */
> - u32 vector : 8,
> - delivery_mode : 3,
> - __reserved_1 : 1,
> - delivery_status : 1,
> - polarity : 1,
> - remote_irr : 1,
> - trigger : 1,
> - mask : 1,
> - __reserved_2 : 15;
> - u32 __reserved_3[3];
> - } lvt_lint0;
> -
> -/*360*/ struct { /* LVT - LINT1 */
> - u32 vector : 8,
> - delivery_mode : 3,
> - __reserved_1 : 1,
> - delivery_status : 1,
> - polarity : 1,
> - remote_irr : 1,
> - trigger : 1,
> - mask : 1,
> - __reserved_2 : 15;
> - u32 __reserved_3[3];
> - } lvt_lint1;
> -
> -/*370*/ struct { /* LVT - Error */
> - u32 vector : 8,
> - __reserved_1 : 4,
> - delivery_status : 1,
> - __reserved_2 : 3,
> - mask : 1,
> - __reserved_3 : 15;
> - u32 __reserved_4[3];
> - } lvt_error;
> -
> -/*380*/ struct { /* Timer Initial Count Register */
> - u32 initial_count;
> - u32 __reserved_2[3];
> - } timer_icr;
> -
> -/*390*/ const
> - struct { /* Timer Current Count Register */
> - u32 curr_count;
> - u32 __reserved_2[3];
> - } timer_ccr;
> -
> -/*3A0*/ struct { u32 __reserved[4]; } __reserved_16;
> -
> -/*3B0*/ struct { u32 __reserved[4]; } __reserved_17;
> -
> -/*3C0*/ struct { u32 __reserved[4]; } __reserved_18;
> -
> -/*3D0*/ struct { u32 __reserved[4]; } __reserved_19;
> -
> -/*3E0*/ struct { /* Timer Divide Configuration Register */
> - u32 divisor : 4,
> - __reserved_1 : 28;
> - u32 __reserved_2[3];
> - } timer_dcr;
> -
> -/*3F0*/ struct { u32 __reserved[4]; } __reserved_20;
> -
> -} __attribute__ ((packed));
> -
> -#undef u32
> -
> #ifdef CONFIG_X86_32
> #define BAD_APICID 0xFFu
> #else
> #define BAD_APICID 0xFFFFu
> #endif
>
> -#endif /* !__ASSEMBLY__ */
> #endif /* _ASM_X86_APICDEF_H */
>
> --
> 2.30.2
>
--
Steve Wahl, Hewlett Packard Enterprise
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