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Wysocki" , =?utf-8?q?Roger_Pau_Monn=C3=A9?= CC: , , , , Huang Rui , Jiqian Chen , Huang Rui Subject: [KERNEL PATCH v6 1/3] xen/pci: Add xen_reset_device_state function Date: Fri, 19 Apr 2024 11:36:14 +0800 Message-ID: <20240419033616.607889-2-Jiqian.Chen@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240419033616.607889-1-Jiqian.Chen@amd.com> References: <20240419033616.607889-1-Jiqian.Chen@amd.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001CB:EE_|DS0PR12MB7995:EE_ X-MS-Office365-Filtering-Correlation-Id: c12128c5-aabb-4469-36c3-08dc6021ebf7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(1800799015)(82310400014)(36860700004)(376005);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Apr 2024 03:36:38.6146 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c12128c5-aabb-4469-36c3-08dc6021ebf7 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001CB.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB7995 When device on dom0 side has been reset, the vpci on Xen side won't get notification, so that the cached state in vpci is all out of date with the real device state. To solve that problem, add a new function to clear all vpci device state when device is reset on dom0 side. And call that function in pcistub_init_device. Because when using "pci-assignable-add" to assign a passthrough device in Xen, it will reset passthrough device and the vpci state will out of date, and then device will fail to restore bar state. Co-developed-by: Huang Rui Signed-off-by: Jiqian Chen Reviewed-by: Stefano Stabellini --- drivers/xen/pci.c | 12 ++++++++++++ drivers/xen/xen-pciback/pci_stub.c | 18 +++++++++++++++--- include/xen/interface/physdev.h | 7 +++++++ include/xen/pci.h | 6 ++++++ 4 files changed, 40 insertions(+), 3 deletions(-) diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c index 72d4e3f193af..e9b30bc09139 100644 --- a/drivers/xen/pci.c +++ b/drivers/xen/pci.c @@ -177,6 +177,18 @@ static int xen_remove_device(struct device *dev) return r; } +int xen_reset_device_state(const struct pci_dev *dev) +{ + struct physdev_pci_device device = { + .seg = pci_domain_nr(dev->bus), + .bus = dev->bus->number, + .devfn = dev->devfn + }; + + return HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_state_reset, &device); +} +EXPORT_SYMBOL_GPL(xen_reset_device_state); + static int xen_pci_notifier(struct notifier_block *nb, unsigned long action, void *data) { diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c index e34b623e4b41..46c40ec8a18e 100644 --- a/drivers/xen/xen-pciback/pci_stub.c +++ b/drivers/xen/xen-pciback/pci_stub.c @@ -89,6 +89,16 @@ static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev) return psdev; } +static int pcistub_reset_device_state(struct pci_dev *dev) +{ + __pci_reset_function_locked(dev); + + if (!xen_pv_domain()) + return xen_reset_device_state(dev); + else + return 0; +} + /* Don't call this directly as it's called by pcistub_device_put */ static void pcistub_device_release(struct kref *kref) { @@ -107,7 +117,7 @@ static void pcistub_device_release(struct kref *kref) /* Call the reset function which does not take lock as this * is called from "unbind" which takes a device_lock mutex. */ - __pci_reset_function_locked(dev); + pcistub_reset_device_state(dev); if (dev_data && pci_load_and_free_saved_state(dev, &dev_data->pci_saved_state)) dev_info(&dev->dev, "Could not reload PCI state\n"); @@ -284,7 +294,7 @@ void pcistub_put_pci_dev(struct pci_dev *dev) * (so it's ready for the next domain) */ device_lock_assert(&dev->dev); - __pci_reset_function_locked(dev); + pcistub_reset_device_state(dev); dev_data = pci_get_drvdata(dev); ret = pci_load_saved_state(dev, dev_data->pci_saved_state); @@ -420,7 +430,9 @@ static int pcistub_init_device(struct pci_dev *dev) dev_err(&dev->dev, "Could not store PCI conf saved state!\n"); else { dev_dbg(&dev->dev, "resetting (FLR, D3, etc) the device\n"); - __pci_reset_function_locked(dev); + err = pcistub_reset_device_state(dev); + if (err) + goto config_release; pci_restore_state(dev); } /* Now disable the device (this also ensures some private device diff --git a/include/xen/interface/physdev.h b/include/xen/interface/physdev.h index a237af867873..8609770e28f5 100644 --- a/include/xen/interface/physdev.h +++ b/include/xen/interface/physdev.h @@ -256,6 +256,13 @@ struct physdev_pci_device_add { */ #define PHYSDEVOP_prepare_msix 30 #define PHYSDEVOP_release_msix 31 +/* + * Notify the hypervisor that a PCI device has been reset, so that any + * internally cached state is regenerated. Should be called after any + * device reset performed by the hardware domain. + */ +#define PHYSDEVOP_pci_device_state_reset 32 + struct physdev_pci_device { /* IN */ uint16_t seg; diff --git a/include/xen/pci.h b/include/xen/pci.h index b8337cf85fd1..b2e2e856efd6 100644 --- a/include/xen/pci.h +++ b/include/xen/pci.h @@ -4,10 +4,16 @@ #define __XEN_PCI_H__ #if defined(CONFIG_XEN_DOM0) +int xen_reset_device_state(const struct pci_dev *dev); int xen_find_device_domain_owner(struct pci_dev *dev); int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain); int xen_unregister_device_domain_owner(struct pci_dev *dev); #else +static inline int xen_reset_device_state(const struct pci_dev *dev) +{ + return -1; +} + static inline int xen_find_device_domain_owner(struct pci_dev *dev) { return -1; From patchwork Fri Apr 19 03:36:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Chen, Jiqian" X-Patchwork-Id: 13635621 Received: from NAM10-MW2-obe.outbound.protection.outlook.com (mail-mw2nam10on2078.outbound.protection.outlook.com [40.107.94.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4EB09B669; 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Thu, 18 Apr 2024 22:36:37 -0500 From: Jiqian Chen To: Juergen Gross , Stefano Stabellini , Bjorn Helgaas , "Rafael J . Wysocki" , =?utf-8?q?Roger_Pau_Monn=C3=A9?= CC: , , , , Huang Rui , Jiqian Chen , Huang Rui Subject: [RFC KERNEL PATCH v6 2/3] xen/pvh: Setup gsi for passthrough device Date: Fri, 19 Apr 2024 11:36:15 +0800 Message-ID: <20240419033616.607889-3-Jiqian.Chen@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240419033616.607889-1-Jiqian.Chen@amd.com> References: <20240419033616.607889-1-Jiqian.Chen@amd.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001CE:EE_|IA1PR12MB6601:EE_ X-MS-Office365-Filtering-Correlation-Id: b801c304-3894-4251-ca35-08dc6021ed95 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(36860700004)(1800799015)(376005)(82310400014);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Apr 2024 03:36:41.4253 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b801c304-3894-4251-ca35-08dc6021ed95 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001CE.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6601 In PVH dom0, the gsis don't get registered, but the gsi of a passthrough device must be configured for it to be able to be mapped into a domU. When assign a device to passthrough, proactively setup the gsi of the device during that process. Co-developed-by: Huang Rui Signed-off-by: Jiqian Chen Reviewed-by: Stefano Stabellini --- arch/x86/xen/enlighten_pvh.c | 92 ++++++++++++++++++++++++++++++ drivers/acpi/pci_irq.c | 2 +- drivers/xen/xen-pciback/pci_stub.c | 8 +++ include/linux/acpi.h | 1 + include/xen/acpi.h | 6 ++ 5 files changed, 108 insertions(+), 1 deletion(-) diff --git a/arch/x86/xen/enlighten_pvh.c b/arch/x86/xen/enlighten_pvh.c index c28f073c1df5..12be665b27d8 100644 --- a/arch/x86/xen/enlighten_pvh.c +++ b/arch/x86/xen/enlighten_pvh.c @@ -2,6 +2,7 @@ #include #include #include +#include #include @@ -26,6 +27,97 @@ bool __ro_after_init xen_pvh; EXPORT_SYMBOL_GPL(xen_pvh); +typedef struct gsi_info { + int gsi; + int trigger; + int polarity; +} 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; + 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 || !gsi_info) + return -EINVAL; + + pin = dev->pin; + if (!pin) + 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 + gsi = -1; + + if (gsi < 0) + return -EINVAL; + + gsi_info->gsi = gsi; + gsi_info->trigger = trigger; + gsi_info->polarity = polarity; + + return 0; +} + +static int xen_pvh_setup_gsi(gsi_info_t *gsi_info) +{ + struct physdev_setup_gsi setup_gsi; + + if (!gsi_info) + return -EINVAL; + + 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_setup_gsi(&gsi_info); + if (ret == -EEXIST) { + xen_raw_printk("Already setup the GSI :%d\n", gsi_info.gsi); + ret = 0; + } else if (ret) + xen_raw_printk("Fail to setup GSI (%d)!\n", gsi_info.gsi); + + 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 46c40ec8a18e..22d4380d2b04 100644 --- a/drivers/xen/xen-pciback/pci_stub.c +++ b/drivers/xen/xen-pciback/pci_stub.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include #include @@ -435,6 +436,13 @@ static int pcistub_init_device(struct pci_dev *dev) goto config_release; pci_restore_state(dev); } + + if (xen_initial_domain() && xen_pvh_domain()) { + err = xen_pvh_passthrough_gsi(dev); + if (err) + goto config_release; + } + /* Now disable the device (this also ensures some private device * data is setup before we export) */ diff --git a/include/linux/acpi.h b/include/linux/acpi.h index b7165e52b3c6..08f1e316bf27 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -361,6 +361,7 @@ 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..17c4d37f1e60 100644 --- a/include/xen/acpi.h +++ b/include/xen/acpi.h @@ -67,10 +67,16 @@ 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) { } + +static inline int xen_pvh_passthrough_gsi(struct pci_dev *dev) +{ + return -1; +} #endif #endif /* _XEN_ACPI_H */ From patchwork Fri Apr 19 03:36:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Chen, Jiqian" X-Patchwork-Id: 13635622 Received: from NAM10-DM6-obe.outbound.protection.outlook.com (mail-dm6nam10on2079.outbound.protection.outlook.com [40.107.93.79]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 50B74C8FF; 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Thu, 18 Apr 2024 22:36:40 -0500 From: Jiqian Chen To: Juergen Gross , Stefano Stabellini , Bjorn Helgaas , "Rafael J . Wysocki" , =?utf-8?q?Roger_Pau_Monn=C3=A9?= CC: , , , , Huang Rui , Jiqian Chen , Huang Rui Subject: [RFC KERNEL PATCH v6 3/3] xen/privcmd: Add new syscall to get gsi from irq Date: Fri, 19 Apr 2024 11:36:16 +0800 Message-ID: <20240419033616.607889-4-Jiqian.Chen@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240419033616.607889-1-Jiqian.Chen@amd.com> References: <20240419033616.607889-1-Jiqian.Chen@amd.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001CE:EE_|SN7PR12MB7812:EE_ X-MS-Office365-Filtering-Correlation-Id: 4140075f-2dcc-449d-b2e2-08dc6021ef85 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(1800799015)(376005)(82310400014)(36860700004);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Apr 2024 03:36:44.7221 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4140075f-2dcc-449d-b2e2-08dc6021ef85 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001CE.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB7812 In PVH dom0, it uses the linux local interrupt mechanism, when it allocs irq for a gsi, it is dynamic, and follow the principle of applying first, distributing first. And the irq number is alloced from small to large, but the applying gsi number is not, may gsi 38 comes before gsi 28, it causes the irq number is not equal with the gsi number. And when passthrough a device, QEMU will use device's gsi number to do pirq mapping, but the gsi number is got from file /sys/bus/pci/devices//irq, irq!= gsi, so it will fail when mapping. And in current linux codes, there is no method to translate irq to gsi for userspace. For above purpose, record the relationship of gsi and irq when PVH dom0 do acpi_register_gsi_ioapic for devices and adds a new syscall into privcmd to let userspace can get that translation when they have a need. Co-developed-by: Huang Rui Signed-off-by: Jiqian Chen --- arch/x86/include/asm/apic.h | 8 +++++++ arch/x86/include/asm/xen/pci.h | 5 ++++ arch/x86/kernel/acpi/boot.c | 2 +- arch/x86/pci/xen.c | 21 +++++++++++++++++ drivers/xen/events/events_base.c | 39 ++++++++++++++++++++++++++++++++ drivers/xen/privcmd.c | 19 ++++++++++++++++ include/uapi/xen/privcmd.h | 7 ++++++ include/xen/events.h | 5 ++++ 8 files changed, 105 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h index 9d159b771dc8..dd4139250895 100644 --- a/arch/x86/include/asm/apic.h +++ b/arch/x86/include/asm/apic.h @@ -169,6 +169,9 @@ 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 @@ -183,6 +186,11 @@ 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 85a3ce2a3666..72c73458c083 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -749,7 +749,7 @@ 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 652cd53e77f6..f056ab5c0a06 100644 --- a/arch/x86/pci/xen.c +++ b/arch/x86/pci/xen.c @@ -114,6 +114,21 @@ 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; + + irq = acpi_register_gsi_ioapic(dev, gsi, trigger, polarity); + if (irq < 0) + return irq; + + if (xen_pvh_add_gsi_irq_map(gsi, irq) == -EEXIST) + printk(KERN_INFO "Already map the GSI :%u and IRQ: %d\n", gsi, irq); + + return irq; +} + #ifdef CONFIG_XEN_PV_DOM0 static int xen_register_gsi(u32 gsi, int triggering, int polarity) { @@ -558,6 +573,12 @@ int __init pci_xen_hvm_init(void) return 0; } +int __init pci_xen_pvh_init(void) +{ + __acpi_register_gsi = acpi_register_gsi_xen_pvh; + 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 27553673e46b..80d4f7faac64 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -953,6 +953,43 @@ int xen_irq_from_gsi(unsigned gsi) } EXPORT_SYMBOL_GPL(xen_irq_from_gsi); +int xen_gsi_from_irq(unsigned irq) +{ + struct irq_info *info; + + list_for_each_entry(info, &xen_irq_list_head, list) { + if (info->type != IRQT_PIRQ) + continue; + + if (info->irq == irq) + return info->u.pirq.gsi; + } + + return -1; +} +EXPORT_SYMBOL_GPL(xen_gsi_from_irq); + +int xen_pvh_add_gsi_irq_map(unsigned gsi, unsigned irq) +{ + int tmp_irq; + struct irq_info *info; + + tmp_irq = xen_irq_from_gsi(gsi); + if (tmp_irq != -1) + return -EEXIST; + + info = kzalloc(sizeof(*info), GFP_KERNEL); + if (info == NULL) + panic("Unable to allocate metadata for GSI%d\n", gsi); + + info->type = IRQT_PIRQ; + info->irq = irq; + info->u.pirq.gsi = gsi; + list_add_tail(&info->list, &xen_irq_list_head); + + return 0; +} + static void __unbind_from_irq(struct irq_info *info, unsigned int irq) { evtchn_port_t evtchn; @@ -2295,6 +2332,8 @@ 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(); diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c index 67dfa4778864..11feed529e1d 100644 --- a/drivers/xen/privcmd.c +++ b/drivers/xen/privcmd.c @@ -842,6 +842,21 @@ static long privcmd_ioctl_mmap_resource(struct file *file, return rc; } +static long privcmd_ioctl_gsi_from_irq(struct file *file, void __user *udata) +{ + struct privcmd_gsi_from_irq kdata; + + if (copy_from_user(&kdata, udata, sizeof(kdata))) + return -EFAULT; + + kdata.gsi = xen_gsi_from_irq(kdata.irq); + + if (copy_to_user(udata, &kdata, sizeof(kdata))) + return -EFAULT; + + return 0; +} + #ifdef CONFIG_XEN_PRIVCMD_EVENTFD /* Irqfd support */ static struct workqueue_struct *irqfd_cleanup_wq; @@ -1529,6 +1544,10 @@ static long privcmd_ioctl(struct file *file, ret = privcmd_ioctl_ioeventfd(file, udata); break; + case IOCTL_PRIVCMD_GSI_FROM_IRQ: + ret = privcmd_ioctl_gsi_from_irq(file, udata); + break; + default: break; } diff --git a/include/uapi/xen/privcmd.h b/include/uapi/xen/privcmd.h index 8b8c5d1420fe..61f0ffbec077 100644 --- a/include/uapi/xen/privcmd.h +++ b/include/uapi/xen/privcmd.h @@ -126,6 +126,11 @@ struct privcmd_ioeventfd { __u8 pad[2]; }; +struct privcmd_gsi_from_irq { + __u32 irq; + __u32 gsi; +}; + /* * @cmd: IOCTL_PRIVCMD_HYPERCALL * @arg: &privcmd_hypercall_t @@ -157,5 +162,7 @@ struct privcmd_ioeventfd { _IOW('P', 8, struct privcmd_irqfd) #define IOCTL_PRIVCMD_IOEVENTFD \ _IOW('P', 9, struct privcmd_ioeventfd) +#define IOCTL_PRIVCMD_GSI_FROM_IRQ \ + _IOC(_IOC_NONE, 'P', 10, sizeof(struct privcmd_gsi_from_irq)) #endif /* __LINUX_PUBLIC_PRIVCMD_H__ */ diff --git a/include/xen/events.h b/include/xen/events.h index 3b07409f8032..411298ae7fb0 100644 --- a/include/xen/events.h +++ b/include/xen/events.h @@ -127,6 +127,11 @@ int xen_pirq_from_irq(unsigned irq); /* Return the irq allocated to the gsi */ int xen_irq_from_gsi(unsigned gsi); +/* Return the gsi from irq */ +int xen_gsi_from_irq(unsigned irq); + +int xen_pvh_add_gsi_irq_map(unsigned gsi, unsigned irq); + /* Determine whether to ignore this IRQ if it is passed to a guest. */ int xen_test_irq_shared(int irq);