linux-kernel - Re: [PATCH 4/8] x86/platform/UV: Add Support for UV4 Hubless NMIs

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Date:   Sat, 14 Jan 2017 08:52:41 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Mike Travis <travis@....com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Dimitri Sivanich <sivanich@....com>
Subject: Re: [PATCH 4/8] x86/platform/UV: Add Support for UV4 Hubless NMIs


* Mike Travis <travis@....com> wrote:

> --- linux.orig/arch/x86/kernel/apic/x2apic_uv_x.c
> +++ linux/arch/x86/kernel/apic/x2apic_uv_x.c
> @@ -1529,6 +1529,8 @@ void __init uv_system_init(void)
>  		uv_system_init_hub();
>  
>  	/* Initialize UV hubless system here */
> +	else
> +		uv_nmi_setup_hubless();

That's not the proper coding style ...

> +++ linux/arch/x86/platform/uv/uv_nmi.c
> @@ -67,6 +67,19 @@ static struct uv_hub_nmi_s **uv_hub_nmi_
>  DEFINE_PER_CPU(struct uv_cpu_nmi_s, uv_cpu_nmi);
>  EXPORT_PER_CPU_SYMBOL_GPL(uv_cpu_nmi);
>  
> +/* UV hubless values */
> +static int *pch_base;
> +#define	NMI_CONTROL_PORT	0x70

Ditto...

> +#define	NMI_DUMMY_PORT		0x71
> +#define	GPI_NMI_STS_GPP_D_0	0x164
> +#define	GPI_NMI_ENA_GPP_D_0	0x174
> +#define	STS_GPP_D_0_MASK	0x1
> +#define	PAD_CFG_DW0_GPP_D_0	0x4c0
> +#define	GPIROUTNMI		(1ul << 17)
> +#define	PCH_PCR_GPIO_1_BASE	0xfdae0000ul
> +#define	PCH_PCR_GPIO_ADDRESS(offset)	\
> +	(int *)((unsigned long long)pch_base | offset)

> +static void uv_init_hubless_pch_io(int offset, int mask, int data)
> +{
> +	int *addr = PCH_PCR_GPIO_ADDRESS(offset);
> +	int readd = readl(addr);
> +
> +	if (mask) {			/* OR in new data */
> +		int writed = (readd & ~mask) | data;
> +
> +		nmi_debug("UV:PCH: %p = %x & %x | %x (%x)\n",
> +			addr, readd, ~mask, data, writed);

No unnecessary linebreaks please.

> +
>  			/* wait a moment for the hub nmi locker to set flag */
> -			cpu_relax();

Please capitalize 'NMI' consistently in all the patches.

> +	/* PCH NMI causes only one cpu to respond */

Same for 'CPU'.

>  	else if (uv_nmi_action_is("kdb") || uv_nmi_action_is("kgdb"))
>  		uv_call_kgdb_kdb(cpu, regs, master);
>  
> +	/* Unknown NMI action */
> +	else {

Sigh ...

> +/* setup for UV Hubless systems */
> +void __init uv_nmi_setup_hubless(void)
> +{
> +	uv_nmi_setup_common(false);
> +
> +	pch_base = xlate_dev_mem_ptr(PCH_PCR_GPIO_1_BASE);
> +	nmi_debug("UV: PCH base:%p from 0x%lx, GPP_D_0\n",
> +		pch_base, PCH_PCR_GPIO_1_BASE);
> +
> +	uv_init_hubless_pch_io(GPI_NMI_ENA_GPP_D_0,
> +				STS_GPP_D_0_MASK, STS_GPP_D_0_MASK);
> +
> +	uv_nmi_setup_hubless_intr();
> +
> +	uv_reassert_nmi();		/* insure NMI enabled in proc inf reg */

And typos ...

Much cleaner patches please! I haven't checked the others in the series but please 
review them for similar mishaps.

Thanks,

	Ingo