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Message-ID: <20230312120157.452859-5-ray.huang@amd.com>
Date: Sun, 12 Mar 2023 20:01:56 +0800
From: Huang Rui <ray.huang@....com>
To: Juergen Gross <jgross@...e.com>,
Stefano Stabellini <sstabellini@...nel.org>,
Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Roger Pau Monné <roger.pau@...rix.com>,
<xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>,
<dri-devel@...ts.freedesktop.org>, <amd-gfx@...ts.freedesktop.org>
CC: Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
"Stewart Hildebrand" <Stewart.Hildebrand@....com>,
Xenia Ragiadakou <burzalodowa@...il.com>,
Honglei Huang <honglei1.huang@....com>,
Julia Zhang <julia.zhang@....com>,
Chen Jiqian <Jiqian.Chen@....com>,
Huang Rui <ray.huang@....com>
Subject: [RFC PATCH 4/5] x86/xen: acpi registers gsi for xen pvh
From: Chen Jiqian <Jiqian.Chen@....com>
Add acpi_register_gsi_xen_pvh() to register gsi for PVH mode.
In addition to call acpi_register_gsi_ioapic(), it also setup
a map between gsi and vector in hypervisor side. So that,
when dgpu create an interrupt, hypervisor can correctly find
which guest domain to process interrupt by vector.
Signed-off-by: Chen Jiqian <Jiqian.Chen@....com>
Signed-off-by: Huang Rui <ray.huang@....com>
---
arch/x86/include/asm/apic.h | 7 ++++++
arch/x86/include/asm/xen/pci.h | 5 ++++
arch/x86/kernel/acpi/boot.c | 2 +-
arch/x86/pci/xen.c | 39 ++++++++++++++++++++++++++++++++
drivers/xen/events/events_base.c | 2 ++
5 files changed, 54 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 3415321c8240..f3bc5de1f1d4 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -179,6 +179,8 @@ extern bool apic_needs_pit(void);
extern void apic_send_IPI_allbutself(unsigned int vector);
+extern int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
+ int trigger, int polarity);
#else /* !CONFIG_X86_LOCAL_APIC */
static inline void lapic_shutdown(void) { }
#define local_apic_timer_c2_ok 1
@@ -193,6 +195,11 @@ static inline void apic_intr_mode_init(void) { }
static inline void lapic_assign_system_vectors(void) { }
static inline void lapic_assign_legacy_vector(unsigned int i, bool r) { }
static inline bool apic_needs_pit(void) { return true; }
+static inline int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
+ int trigger, int polarity)
+{
+ return (int)gsi;
+}
#endif /* !CONFIG_X86_LOCAL_APIC */
#ifdef CONFIG_X86_X2APIC
diff --git a/arch/x86/include/asm/xen/pci.h b/arch/x86/include/asm/xen/pci.h
index 9015b888edd6..aa8ded61fc2d 100644
--- a/arch/x86/include/asm/xen/pci.h
+++ b/arch/x86/include/asm/xen/pci.h
@@ -5,6 +5,7 @@
#if defined(CONFIG_PCI_XEN)
extern int __init pci_xen_init(void);
extern int __init pci_xen_hvm_init(void);
+extern int __init pci_xen_pvh_init(void);
#define pci_xen 1
#else
#define pci_xen 0
@@ -13,6 +14,10 @@ static inline int pci_xen_hvm_init(void)
{
return -1;
}
+static inline int pci_xen_pvh_init(void)
+{
+ return -1;
+}
#endif
#ifdef CONFIG_XEN_PV_DOM0
int __init pci_xen_initial_domain(void);
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 907cc98b1938..25ec48dd897e 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -718,7 +718,7 @@ static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
}
#ifdef CONFIG_X86_LOCAL_APIC
-static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
+int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
int trigger, int polarity)
{
int irq = gsi;
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index b94f727251b6..43b8b6d7147b 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -114,6 +114,38 @@ static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
false /* no mapping of GSI to PIRQ */);
}
+static int acpi_register_gsi_xen_pvh(struct device *dev, u32 gsi,
+ int trigger, int polarity)
+{
+ int irq;
+ int rc;
+ struct physdev_map_pirq map_irq;
+ struct physdev_setup_gsi setup_gsi;
+
+ irq = acpi_register_gsi_ioapic(dev, gsi, trigger, polarity);
+
+ map_irq.domid = DOMID_SELF;
+ map_irq.type = MAP_PIRQ_TYPE_GSI;
+ map_irq.index = gsi;
+ map_irq.pirq = gsi;
+
+ rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
+ if (rc)
+ printk(KERN_ERR "xen map GSI: %u failed %d\n", gsi, rc);
+
+ setup_gsi.gsi = gsi;
+ setup_gsi.triggering = (trigger == ACPI_EDGE_SENSITIVE ? 0 : 1);
+ setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
+
+ rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
+ if (rc == -EEXIST)
+ printk(KERN_INFO "Already setup the GSI :%u\n", gsi);
+ else if (rc)
+ printk(KERN_ERR "Failed to setup GSI :%u, err_code:%d\n", gsi, rc);
+
+ return irq;
+}
+
#ifdef CONFIG_XEN_PV_DOM0
static int xen_register_gsi(u32 gsi, int triggering, int polarity)
{
@@ -554,6 +586,13 @@ int __init pci_xen_hvm_init(void)
return 0;
}
+int __init pci_xen_pvh_init(void)
+{
+ __acpi_register_gsi = acpi_register_gsi_xen_pvh;
+ __acpi_unregister_gsi = NULL;
+ return 0;
+}
+
#ifdef CONFIG_XEN_PV_DOM0
int __init pci_xen_initial_domain(void)
{
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index c443f04aaad7..48dff0ed9acd 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -2317,6 +2317,8 @@ void __init xen_init_IRQ(void)
xen_init_setup_upcall_vector();
xen_alloc_callback_vector();
+ if (xen_pvh_domain())
+ pci_xen_pvh_init();
if (xen_hvm_domain()) {
native_init_IRQ();
--
2.25.1
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