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Message-ID:
<TY3PR01MB9983ACD7CF3A638D96083536D53EA@TY3PR01MB9983.jpnprd01.prod.outlook.com>
Date: Mon, 25 Aug 2025 08:22:47 +0000
From: "Kazuhiro Abe (Fujitsu)" <fj1078ii@...itsu.com>
To: 'Hanjun Guo' <guohanjun@...wei.com>, Lorenzo Pieralisi
<lpieralisi@...nel.org>, Sudeep Holla <sudeep.holla@....com>, "Rafael J.
Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] ACPI: AGDI: Add interrupt signaling mode support
Hi, Hanjun
Thank you for your comment.
> Hi Kazuhiro,
>
> On 2025/8/18 14:54, Kazuhiro Abe wrote:
> > AGDI has two types of signaling modes: SDEI and interrupt.
> > Currently, the AGDI driver only supports SDEI.
> > Therefore, add support for interrupt singaling mode The interrupt
> > vector is retrieved from the AGDI table, and call panic function when
> > an interrupt occurs.
>
>
> > SDEI & Interrupt mode is not supported.
>
> I think this can be removed, it's not allowed naturely.
I mentioned this because it was added in "ACPI for Arm Components 1.2 Platform Design Document"
I think I'll remove it from the cover letter.
>
> >
> > Signed-off-by: Kazuhiro Abe <fj1078ii@...jp.fujitsu.com>
> > ---
> > drivers/acpi/arm64/agdi.c | 114
> +++++++++++++++++++++++++++++++++++---
> > include/acpi/actbl2.h | 4 +-
> > 2 files changed, 110 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/acpi/arm64/agdi.c b/drivers/acpi/arm64/agdi.c
> > index e0df3daa4abf0..c514bb874c5d3 100644
> > --- a/drivers/acpi/arm64/agdi.c
> > +++ b/drivers/acpi/arm64/agdi.c
> > @@ -16,7 +16,11 @@
> > #include "init.h"
> >
> > struct agdi_data {
> > + unsigned char flags;
> > int sdei_event;
> > + unsigned int gsiv;
> > + bool use_nmi;
>
> will we use normal interrupt as the signaling?
>
> In the spec, it says:
>
> Some use-cases, such as system management, require the ability to generate a
> non-maskable event to the OS to request the OS kernel to perform a diagnostic
> dump and reset the system.
I also included request_irq as a fallback, as NMI might not be enabled.
However, if this is not allowed by the specifications, I'd like to remove it.
>
> Seems only non-maskable event is allowed, Sudeep, any idea about this?
>
> > + int irq;
> > };
> >
> > static int agdi_sdei_handler(u32 sdei_event, struct pt_regs *regs,
> > void *arg) @@ -48,6 +52,55 @@ static int agdi_sdei_probe(struct
> platform_device *pdev,
> > return 0;
> > }
> >
> > +static irqreturn_t agdi_interrupt_handler_nmi(int irq, void *dev_id)
> > +{
> > + nmi_panic(NULL, "Arm Generic Diagnostic Dump and Reset NMI
> Interrupt event issued\n");
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static irqreturn_t agdi_interrupt_handler_irq(int irq, void *dev_id)
> > +{
> > + panic("Arm Generic Diagnostic Dump and Reset Interrupt event
> issued\n");
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static int agdi_interrupt_probe(struct platform_device *pdev,
> > + struct agdi_data *adata)
> > +{
> > + unsigned long irq_flags;
> > + int ret;
> > + int irq;
> > +
> > + irq = acpi_register_gsi(NULL, adata->gsiv, ACPI_EDGE_SENSITIVE,
> ACPI_ACTIVE_HIGH);
> > + if (irq < 0) {
> > + dev_err(&pdev->dev, "cannot register GSI#%d (%d)\n",
> adata->gsiv, irq);
> > + return irq;
> > + }
> > +
> > + irq_flags = IRQF_PERCPU | IRQF_NOBALANCING |
> IRQF_NO_AUTOEN |
> > + IRQF_NO_THREAD;
> > + /* try NMI first */
> > + ret = request_nmi(irq, &agdi_interrupt_handler_nmi, irq_flags,
> > + "agdi_interrupt_nmi", NULL);
> > + if (ret) {
> > + ret = request_irq(irq, &agdi_interrupt_handler_irq,
> > + irq_flags, "agdi_interrupt_irq", NULL);
> > + if (ret) {
> > + dev_err(&pdev->dev, "cannot register IRQ %d\n",
> ret);
> > + acpi_unregister_gsi(adata->gsiv);
> > + return ret;
> > + }
> > + enable_irq(irq);
> > + adata->irq = irq;
> > + } else {
> > + enable_nmi(irq);
> > + adata->irq = irq;
> > + adata->use_nmi = true;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > static int agdi_probe(struct platform_device *pdev)
> > {
> > struct agdi_data *adata = dev_get_platdata(&pdev->dev); @@ -55,12
> > +108,20 @@ static int agdi_probe(struct platform_device *pdev)
> > if (!adata)
> > return -EINVAL;
> >
> > - return agdi_sdei_probe(pdev, adata);
> > + switch (adata->flags & ACPI_AGDI_SIGNALING_MODE_MASK) {
> > + case ACPI_AGDI_SIGNALING_MODE_SDEI:
> > + return agdi_sdei_probe(pdev, adata);
> > +
> > + case ACPI_AGDI_SIGNALING_MODE_INTERRUPT:
> > + return agdi_interrupt_probe(pdev, adata);
> > + }
> > +
> > + return 0;
> > }
> >
> > -static void agdi_remove(struct platform_device *pdev)
> > +static void agdi_sdei_remove(struct platform_device *pdev,
> > + struct agdi_data *adata)
> > {
> > - struct agdi_data *adata = dev_get_platdata(&pdev->dev);
> > int err, i;
> >
> > err = sdei_event_disable(adata->sdei_event);
> > @@ -83,6 +144,34 @@ static void agdi_remove(struct platform_device
> *pdev)
> > adata->sdei_event, ERR_PTR(err));
> > }
> >
> > +static void agdi_interrupt_remove(struct platform_device *pdev,
> > + struct agdi_data *adata)
> > +{
> > + if (adata->irq != -1) {
> > + if (adata->use_nmi)
> > + free_nmi(adata->irq, NULL);
> > + else
> > + free_irq(adata->irq, NULL);
> > +
> > + acpi_unregister_gsi(adata->gsiv);
> > + }
> > +}
> > +
> > +static void agdi_remove(struct platform_device *pdev) {
> > + struct agdi_data *adata = dev_get_platdata(&pdev->dev);
> > +
> > + switch (adata->flags & ACPI_AGDI_SIGNALING_MODE_MASK) {
> > + case ACPI_AGDI_SIGNALING_MODE_SDEI:
> > + agdi_sdei_remove(pdev, adata);
> > + break;
> > +
> > + case ACPI_AGDI_SIGNALING_MODE_INTERRUPT:
> > + agdi_interrupt_remove(pdev, adata);
> > + break;
> > + }
> > +}
> > +
> > static struct platform_driver agdi_driver = {
> > .driver = {
> > .name = "agdi",
> > @@ -94,7 +183,7 @@ static struct platform_driver agdi_driver = {
> > void __init acpi_agdi_init(void)
> > {
> > struct acpi_table_agdi *agdi_table;
> > - struct agdi_data pdata;
> > + struct agdi_data pdata = {0};
> > struct platform_device *pdev;
> > acpi_status status;
> >
> > @@ -103,12 +192,23 @@ void __init acpi_agdi_init(void)
> > if (ACPI_FAILURE(status))
> > return;
> >
> > - if (agdi_table->flags & ACPI_AGDI_SIGNALING_MODE) {
> > - pr_warn("Interrupt signaling is not supported");
> > + switch (agdi_table->flags & ACPI_AGDI_SIGNALING_MODE_MASK)
> {
> > + case ACPI_AGDI_SIGNALING_MODE_SDEI:
> > + pdata.sdei_event = agdi_table->sdei_event;
> > + break;
> > +
> > + case ACPI_AGDI_SIGNALING_MODE_INTERRUPT:
> > + pdata.gsiv = agdi_table->gsiv;
> > + break;
> > +
> > + default:
> > + pr_warn("Signaling mode(%d) is not supported",
> > + agdi_table->flags &
> ACPI_AGDI_SIGNALING_MODE_MASK);
> > goto err_put_table;
> > }
> >
> > - pdata.sdei_event = agdi_table->sdei_event;
> > + pdata.irq = -1;
> > + pdata.flags = agdi_table->flags;
>
> My major concern is about the normal interrrupt as the event, not sure if it is ok,
> let's figure it out first.
As mentioned above, I'd like to remove normal interrupt handling if this is not allowed by the specifications.
>
> >
> > pdev = platform_device_register_data(NULL, "agdi", 0, &pdata,
> sizeof(pdata));
> > if (IS_ERR(pdev))
> > diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h index
> > 048f5f47f8b88..9ddbdd772f139 100644
> > --- a/include/acpi/actbl2.h
> > +++ b/include/acpi/actbl2.h
> > @@ -339,7 +339,9 @@ struct acpi_table_agdi {
> >
> > /* Mask for Flags field above */
> >
> > -#define ACPI_AGDI_SIGNALING_MODE (1)
> > +#define ACPI_AGDI_SIGNALING_MODE_MASK (3) #define
> > +ACPI_AGDI_SIGNALING_MODE_SDEI (0) #define
> > +ACPI_AGDI_SIGNALING_MODE_INTERRUPT (1)
>
> You need to send a patch to ACPICA first to add interrupt support, this file
> belongs acpica.
Understood. I will send a patch to ACPICA first. Once it is merged, I will send v2.
Best Regards,
Kazuhiro Abe
>
> Thanks
> Hanjun
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