| Message ID | 20240419033616.607889-3-Jiqian.Chen@amd.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Krzysztof Wilczyński |
| Headers | show |
| Series | Support device passthrough when dom0 is PVH on Xen | expand |
On 19.04.24 05:36, Jiqian Chen wrote: > 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 <ray.huang@amd.com> > Signed-off-by: Jiqian Chen <Jiqian.Chen@amd.com> > Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> This patch is breaking the build. On Arm I get: In file included from /home/gross/korg/src/drivers/xen/xen-pciback/pci_stub.c:23:0: /home/gross/korg/src/include/xen/acpi.h: In function 'xen_acpi_sleep_register': /home/gross/korg/src/include/xen/acpi.h:67:3: error: 'acpi_suspend_lowlevel' undeclared (first use in this function); did you mean 'xen_acpi_suspend_lowlevel'? acpi_suspend_lowlevel = xen_acpi_suspend_lowlevel; ^~~~~~~~~~~~~~~~~~~~~ xen_acpi_suspend_lowlevel /home/gross/korg/src/include/xen/acpi.h:67:3: note: each undeclared identifier is reported only once for each function it appears in make[6]: *** [/home/gross/korg/src/scripts/Makefile.build:244: drivers/xen/xen-pciback/pci_stub.o] Error 1 make[5]: *** [/home/gross/korg/src/scripts/Makefile.build:485: drivers/xen/xen-pciback] Error 2 make[4]: *** [/home/gross/korg/src/scripts/Makefile.build:485: drivers/xen] Error 2 Additionally I'm seeing this warning on x86_64: /home/gross/korg/src/arch/x86/xen/enlighten_pvh.c:97:5: warning: no previous prototype for ‘xen_pvh_passthrough_gsi’ [-Wmissing-prototypes] int xen_pvh_passthrough_gsi(struct pci_dev *dev) Juergen
Hi, On 2024/5/10 15:48, Juergen Gross wrote: > On 19.04.24 05:36, Jiqian Chen wrote: >> 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 <ray.huang@amd.com> >> Signed-off-by: Jiqian Chen <Jiqian.Chen@amd.com> >> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> > > This patch is breaking the build. > > On Arm I get: > > In file included from /home/gross/korg/src/drivers/xen/xen-pciback/pci_stub.c:23:0: > /home/gross/korg/src/include/xen/acpi.h: In function 'xen_acpi_sleep_register': > /home/gross/korg/src/include/xen/acpi.h:67:3: error: 'acpi_suspend_lowlevel' undeclared (first use in this function); did you mean 'xen_acpi_suspend_lowlevel'? > acpi_suspend_lowlevel = xen_acpi_suspend_lowlevel; > ^~~~~~~~~~~~~~~~~~~~~ > xen_acpi_suspend_lowlevel > /home/gross/korg/src/include/xen/acpi.h:67:3: note: each undeclared identifier is reported only once for each function it appears in > make[6]: *** [/home/gross/korg/src/scripts/Makefile.build:244: drivers/xen/xen-pciback/pci_stub.o] Error 1 > make[5]: *** [/home/gross/korg/src/scripts/Makefile.build:485: drivers/xen/xen-pciback] Error 2 > make[4]: *** [/home/gross/korg/src/scripts/Makefile.build:485: drivers/xen] Error 2 Thanks for testing on Arm, it seems I should use macro "CONFIG_X86" to isolate the modifications to this file. > > Additionally I'm seeing this warning on x86_64: > > /home/gross/korg/src/arch/x86/xen/enlighten_pvh.c:97:5: warning: no previous prototype for ‘xen_pvh_passthrough_gsi’ [-Wmissing-prototypes] > int xen_pvh_passthrough_gsi(struct pci_dev *dev) I think I need to add " #include <xen/acpi.h> " in file enlighten_pvh.c. > > > Juergen
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 <linux/acpi.h> #include <linux/export.h> #include <linux/mm.h> +#include <linux/pci.h> #include <xen/hvc-console.h> @@ -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 <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> @@ -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 */