linux-kernel - Re: [PATCH v10 03/14] powerpc/vas: Alloc and setup IRQ and trigger port address

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Message-ID: <99d4f018-0e2d-9ab4-b4d4-58af7e494ec3@kaod.org>
Date:   Thu, 2 Apr 2020 10:08:05 +0200
From:   Cédric Le Goater <clg@...d.org>
To:     Haren Myneni <haren@...ux.ibm.com>, mpe@...erman.id.au
Cc:     mikey@...ling.org, srikar@...ux.vnet.ibm.com,
        frederic.barrat@...ibm.com, ajd@...ux.ibm.com,
        linux-kernel@...r.kernel.org, npiggin@...il.com, hch@...radead.org,
        oohall@...il.com, sukadev@...ux.vnet.ibm.com,
        linuxppc-dev@...ts.ozlabs.org, herbert@...dor.apana.org.au
Subject: Re: [PATCH v10 03/14] powerpc/vas: Alloc and setup IRQ and trigger
 port address

On 4/2/20 9:10 AM, Haren Myneni wrote:
> 
> Allocate a xive irq on each chip with a vas instance. The NX coprocessor
> raises a host CPU interrupt via vas if it encounters page fault on user
> space request buffer. Subsequent patches register the trigger port with
> the NX coprocessor, and create a vas fault handler for this interrupt
> mapping.

Looks good !

> Signed-off-by: Haren Myneni <haren@...ux.ibm.com>


Reviewed-by: Cédric Le Goater <clg@...d.org>

Thanks,

C.

> ---
>  arch/powerpc/platforms/powernv/vas.c | 44 +++++++++++++++++++++++++++++++-----
>  arch/powerpc/platforms/powernv/vas.h |  2 ++
>  2 files changed, 40 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/powernv/vas.c b/arch/powerpc/platforms/powernv/vas.c
> index ed9cc6d..3303cfe 100644
> --- a/arch/powerpc/platforms/powernv/vas.c
> +++ b/arch/powerpc/platforms/powernv/vas.c
> @@ -15,6 +15,7 @@
>  #include <linux/of_address.h>
>  #include <linux/of.h>
>  #include <asm/prom.h>
> +#include <asm/xive.h>
>  
>  #include "vas.h"
>  
> @@ -25,10 +26,12 @@
>  
>  static int init_vas_instance(struct platform_device *pdev)
>  {
> -	int rc, cpu, vasid;
> -	struct resource *res;
> -	struct vas_instance *vinst;
>  	struct device_node *dn = pdev->dev.of_node;
> +	struct vas_instance *vinst;
> +	struct xive_irq_data *xd;
> +	uint32_t chipid, hwirq;
> +	struct resource *res;
> +	int rc, cpu, vasid;
>  
>  	rc = of_property_read_u32(dn, "ibm,vas-id", &vasid);
>  	if (rc) {
> @@ -36,6 +39,12 @@ static int init_vas_instance(struct platform_device *pdev)
>  		return -ENODEV;
>  	}
>  
> +	rc = of_property_read_u32(dn, "ibm,chip-id", &chipid);
> +	if (rc) {
> +		pr_err("No ibm,chip-id property for %s?\n", pdev->name);
> +		return -ENODEV;
> +	}
> +
>  	if (pdev->num_resources != 4) {
>  		pr_err("Unexpected DT configuration for [%s, %d]\n",
>  				pdev->name, vasid);
> @@ -69,9 +78,32 @@ static int init_vas_instance(struct platform_device *pdev)
>  
>  	vinst->paste_win_id_shift = 63 - res->end;
>  
> -	pr_devel("Initialized instance [%s, %d], paste_base 0x%llx, "
> -			"paste_win_id_shift 0x%llx\n", pdev->name, vasid,
> -			vinst->paste_base_addr, vinst->paste_win_id_shift);
> +	hwirq = xive_native_alloc_irq_on_chip(chipid);
> +	if (!hwirq) {
> +		pr_err("Inst%d: Unable to allocate global irq for chip %d\n",
> +				vinst->vas_id, chipid);
> +		return -ENOENT;
> +	}
> +
> +	vinst->virq = irq_create_mapping(NULL, hwirq);
> +	if (!vinst->virq) {
> +		pr_err("Inst%d: Unable to map global irq %d\n",
> +				vinst->vas_id, hwirq);
> +		return -EINVAL;
> +	}
> +
> +	xd = irq_get_handler_data(vinst->virq);
> +	if (!xd) {
> +		pr_err("Inst%d: Invalid virq %d\n",
> +				vinst->vas_id, vinst->virq);
> +		return -EINVAL;
> +	}
> +
> +	vinst->irq_port = xd->trig_page;
> +	pr_devel("Initialized instance [%s, %d] paste_base 0x%llx paste_win_id_shift 0x%llx IRQ %d Port 0x%llx\n",
> +			pdev->name, vasid, vinst->paste_base_addr,
> +			vinst->paste_win_id_shift, vinst->virq,
> +			vinst->irq_port);
>  
>  	for_each_possible_cpu(cpu) {
>  		if (cpu_to_chip_id(cpu) == of_get_ibm_chip_id(dn))
> diff --git a/arch/powerpc/platforms/powernv/vas.h b/arch/powerpc/platforms/powernv/vas.h
> index 5574aec..598608b 100644
> --- a/arch/powerpc/platforms/powernv/vas.h
> +++ b/arch/powerpc/platforms/powernv/vas.h
> @@ -313,6 +313,8 @@ struct vas_instance {
>  	u64 paste_base_addr;
>  	u64 paste_win_id_shift;
>  
> +	u64 irq_port;
> +	int virq;
>  	struct mutex mutex;
>  	struct vas_window *rxwin[VAS_COP_TYPE_MAX];
>  	struct vas_window *windows[VAS_WINDOWS_PER_CHIP];
>