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Message-ID: <alpine.DEB.2.22.394.2312061818030.1265976@ubuntu-linux-20-04-desktop>
Date: Wed, 6 Dec 2023 18:18:09 -0800 (PST)
From: Stefano Stabellini <sstabellini@...nel.org>
To: "Chen, Jiqian" <Jiqian.Chen@....com>
cc: Jan Beulich <jbeulich@...e.com>,
Roger Pau Monné <roger.pau@...rix.com>,
Stefano Stabellini <sstabellini@...nel.org>,
Juergen Gross <jgross@...e.com>,
Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
Thomas Gleixner <tglx@...utronix.de>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Len Brown <lenb@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
"Stabellini, Stefano" <stefano.stabellini@....com>,
"Deucher, Alexander" <Alexander.Deucher@....com>,
"Koenig, Christian" <Christian.Koenig@....com>,
"Hildebrand, Stewart" <Stewart.Hildebrand@....com>,
"Ragiadakou, Xenia" <Xenia.Ragiadakou@....com>,
"Huang, Honglei1" <Honglei1.Huang@....com>,
"Zhang, Julia" <Julia.Zhang@....com>,
"Huang, Ray" <Ray.Huang@....com>
Subject: Re: [RFC KERNEL PATCH v2 2/3] xen/pvh: Unmask irq for passthrough
device in PVH dom0
On Tue, 5 Dec 2023, Chen, Jiqian wrote:
> When PVH dom0 enable a device, it will get trigger and polarity from ACPI (see acpi_pci_irq_enable)
> I have a version of patch which tried that way, see below:
This approach looks much better. I think this patch is OKish. Juergen,
what do you think?
> diff --git a/arch/x86/xen/enlighten_pvh.c b/arch/x86/xen/enlighten_pvh.c
> index ada3868c02c2..43e1bda9f946 100644
> --- a/arch/x86/xen/enlighten_pvh.c
> +++ b/arch/x86/xen/enlighten_pvh.c
> @@ -1,6 +1,7 @@
> // SPDX-License-Identifier: GPL-2.0
> #include <linux/acpi.h>
> #include <linux/export.h>
> +#include <linux/pci.h>
>
> #include <xen/hvc-console.h>
>
> @@ -25,6 +26,127 @@
> bool __ro_after_init xen_pvh;
> EXPORT_SYMBOL_GPL(xen_pvh);
>
> +typedef struct gsi_info {
> + int gsi;
> + int trigger;
> + int polarity;
> + int pirq;
> +} gsi_info_t;
> +
> +struct acpi_prt_entry {
> + struct acpi_pci_id id;
> + u8 pin;
> + acpi_handle link;
> + u32 index; /* GSI, or link _CRS index */
> +};
> +
> +static int xen_pvh_get_gsi_info(struct pci_dev *dev,
> + gsi_info_t *gsi_info)
> +{
> + int gsi;
> + u8 pin = 0;
> + struct acpi_prt_entry *entry;
> + int trigger = ACPI_LEVEL_SENSITIVE;
> + int polarity = acpi_irq_model == ACPI_IRQ_MODEL_GIC ?
> + ACPI_ACTIVE_HIGH : ACPI_ACTIVE_LOW;
> +
> + if (dev)
> + pin = dev->pin;
> + if (!pin) {
> + xen_raw_printk("No interrupt pin configured\n");
> + return -EINVAL;
> + }
> +
> + entry = acpi_pci_irq_lookup(dev, pin);
> + if (entry) {
> + if (entry->link)
> + gsi = acpi_pci_link_allocate_irq(entry->link,
> + entry->index,
> + &trigger, &polarity,
> + NULL);
> + else
> + gsi = entry->index;
> + } else
> + return -EINVAL;
> +
> + gsi_info->gsi = gsi;
> + gsi_info->trigger = trigger;
> + gsi_info->polarity = polarity;
> +
> + return 0;
> +}
> +
> +static int xen_pvh_map_pirq(gsi_info_t *gsi_info)
> +{
> + struct physdev_map_pirq map_irq;
> + int ret;
> +
> + map_irq.domid = DOMID_SELF;
> + map_irq.type = MAP_PIRQ_TYPE_GSI;
> + map_irq.index = gsi_info->gsi;
> + map_irq.pirq = gsi_info->gsi;
> +
> + ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
> + gsi_info->pirq = map_irq.pirq;
> +
> + return ret;
> +}
> +
> +static int xen_pvh_unmap_pirq(gsi_info_t *gsi_info)
> +{
> + struct physdev_unmap_pirq unmap_irq;
> +
> + unmap_irq.domid = DOMID_SELF;
> + unmap_irq.pirq = gsi_info->pirq;
> +
> + return HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq);
> +}
> +
> +static int xen_pvh_setup_gsi(gsi_info_t *gsi_info)
> +{
> + struct physdev_setup_gsi setup_gsi;
> +
> + setup_gsi.gsi = gsi_info->gsi;
> + setup_gsi.triggering = (gsi_info->trigger == ACPI_EDGE_SENSITIVE ? 0 : 1);
> + setup_gsi.polarity = (gsi_info->polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
> +
> + return HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
> +}
> +
> +int xen_pvh_passthrough_gsi(struct pci_dev *dev)
> +{
> + int ret;
> + gsi_info_t gsi_info;
> +
> + if (!dev) {
> + return -EINVAL;
> + }
> +
> + ret = xen_pvh_get_gsi_info(dev, &gsi_info);
> + if (ret) {
> + xen_raw_printk("Fail to get gsi info!\n");
> + return ret;
> + }
> +
> + ret = xen_pvh_map_pirq(&gsi_info);
> + if (ret) {
> + xen_raw_printk("Fail to map pirq for gsi (%d)!\n", gsi_info.gsi);
> + return ret;
> + }
> +
> + ret = xen_pvh_setup_gsi(&gsi_info);
> + if (ret == -EEXIST) {
> + ret = 0;
> + xen_raw_printk("Already setup the GSI :%u\n", gsi_info.gsi);
> + } else if (ret) {
> + xen_raw_printk("Fail to setup gsi (%d)!\n", gsi_info.gsi);
> + xen_pvh_unmap_pirq(&gsi_info);
> + }
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(xen_pvh_passthrough_gsi);
> +
> void __init xen_pvh_init(struct boot_params *boot_params)
> {
> u32 msr;
> diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
> index ff30ceca2203..630fe0a34bc6 100644
> --- a/drivers/acpi/pci_irq.c
> +++ b/drivers/acpi/pci_irq.c
> @@ -288,7 +288,7 @@ static int acpi_reroute_boot_interrupt(struct pci_dev *dev,
> }
> #endif /* CONFIG_X86_IO_APIC */
>
> -static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
> +struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
> {
> struct acpi_prt_entry *entry = NULL;
> struct pci_dev *bridge;
> diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c
> index e34b623e4b41..1abd4dad6f40 100644
> --- a/drivers/xen/xen-pciback/pci_stub.c
> +++ b/drivers/xen/xen-pciback/pci_stub.c
> @@ -20,6 +20,7 @@
> #include <linux/atomic.h>
> #include <xen/events.h>
> #include <xen/pci.h>
> +#include <xen/acpi.h>
> #include <xen/xen.h>
> #include <asm/xen/hypervisor.h>
> #include <xen/interface/physdev.h>
> @@ -399,6 +400,12 @@ static int pcistub_init_device(struct pci_dev *dev)
> if (err)
> goto config_release;
>
> + if (xen_initial_domain() && xen_pvh_domain()) {
> + err = xen_pvh_passthrough_gsi(dev);
> + if (err)
> + goto config_release;
> + }
> +
> if (dev->msix_cap) {
> struct physdev_pci_device ppdev = {
> .seg = pci_domain_nr(dev->bus),
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index 641dc4843987..368d56ba2c5e 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -375,6 +375,7 @@ void acpi_unregister_gsi (u32 gsi);
>
> struct pci_dev;
>
> +struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin);
> int acpi_pci_irq_enable (struct pci_dev *dev);
> void acpi_penalize_isa_irq(int irq, int active);
> bool acpi_isa_irq_available(int irq);
> diff --git a/include/xen/acpi.h b/include/xen/acpi.h
> index b1e11863144d..ce7f5554f88e 100644
> --- a/include/xen/acpi.h
> +++ b/include/xen/acpi.h
> @@ -67,6 +67,7 @@ static inline void xen_acpi_sleep_register(void)
> acpi_suspend_lowlevel = xen_acpi_suspend_lowlevel;
> }
> }
> +int xen_pvh_passthrough_gsi(struct pci_dev *dev);
> #else
> static inline void xen_acpi_sleep_register(void)
> {
>
> >
> > Jan
>
> --
> Best regards,
> Jiqian Chen.
>
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