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Message-ID: <20240912092352.1602724-3-Jiqian.Chen@amd.com>
Date: Thu, 12 Sep 2024 17:23:50 +0800
From: Jiqian Chen <Jiqian.Chen@....com>
To: Juergen Gross <jgross@...e.com>, Stefano Stabellini
<sstabellini@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, "Rafael J .
Wysocki" <rafael@...nel.org>
CC: <xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>,
<linux-pci@...r.kernel.org>, <linux-acpi@...r.kernel.org>, Jiqian Chen
<Jiqian.Chen@....com>, Huang Rui <ray.huang@....com>
Subject: [KERNEL PATCH v9 2/3] xen/pvh: Setup gsi for passthrough device
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 assigning a device to passthrough, proactively setup the gsi
of the device during that process.
Signed-off-by: Jiqian Chen <Jiqian.Chen@....com>
Signed-off-by: Huang Rui <ray.huang@....com>
Signed-off-by: Jiqian Chen <Jiqian.Chen@....com>
---
v8->v9 changes:
Moved the calling of xen_acpi_get_gsi_info under check "if (xen_initial_domain() && xen_pvh_domain())" to prevent it is called in PV dom0.
Removed Reviewed-by of Stefano.
v7->v8 changes:
Used CONFIG_XEN_ACPI instead of CONFIG_ACPI to wrap codes.
v6->v7 changes:
Moved the implementation of function xen_acpi_get_gsi_info to file drivers/xen/acpi.c, that modification is more convenient for the subsequent patch to obtain gsi.
v5->v6 changes:
No.
v4->v5 changes:
Added Reviewed-by of Stefano.
v3->v4 changes:
Removed map_pirq from xen_pvh_passthrough_gsi since let pvh calls map_pirq here is not right.
v2->v3 changes:
Abandoned previous implementations that called unmask_irq, and change to do setup_gsi and map_pirq for passthrough device in pcistub_init_device.
---
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202406090859.KW3eeESv-lkp@intel.com/
---
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405172132.TazuVpPo-lkp@intel.com/
---
arch/x86/xen/enlighten_pvh.c | 23 ++++++++++++++
drivers/acpi/pci_irq.c | 2 +-
drivers/xen/acpi.c | 50 ++++++++++++++++++++++++++++++
drivers/xen/xen-pciback/pci_stub.c | 20 ++++++++++++
include/linux/acpi.h | 1 +
include/xen/acpi.h | 18 +++++++++++
6 files changed, 113 insertions(+), 1 deletion(-)
diff --git a/arch/x86/xen/enlighten_pvh.c b/arch/x86/xen/enlighten_pvh.c
index 728a4366ca85..bf68c329fc01 100644
--- a/arch/x86/xen/enlighten_pvh.c
+++ b/arch/x86/xen/enlighten_pvh.c
@@ -4,6 +4,7 @@
#include <linux/mm.h>
#include <xen/hvc-console.h>
+#include <xen/acpi.h>
#include <asm/bootparam.h>
#include <asm/io_apic.h>
@@ -28,6 +29,28 @@
bool __ro_after_init xen_pvh;
EXPORT_SYMBOL_GPL(xen_pvh);
+#ifdef CONFIG_XEN_DOM0
+int xen_pvh_setup_gsi(int gsi, int trigger, int polarity)
+{
+ int ret;
+ struct physdev_setup_gsi setup_gsi;
+
+ setup_gsi.gsi = gsi;
+ setup_gsi.triggering = (trigger == ACPI_EDGE_SENSITIVE ? 0 : 1);
+ setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
+
+ ret = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
+ if (ret == -EEXIST) {
+ xen_raw_printk("Already setup the GSI :%d\n", gsi);
+ ret = 0;
+ } else if (ret)
+ xen_raw_printk("Fail to setup GSI (%d)!\n", gsi);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(xen_pvh_setup_gsi);
+#endif
+
/*
* Reserve e820 UNUSABLE regions to inflate the memory balloon.
*
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/acpi.c b/drivers/xen/acpi.c
index 6893c79fd2a1..9e2096524fbc 100644
--- a/drivers/xen/acpi.c
+++ b/drivers/xen/acpi.c
@@ -30,6 +30,7 @@
* IN THE SOFTWARE.
*/
+#include <linux/pci.h>
#include <xen/acpi.h>
#include <xen/interface/platform.h>
#include <asm/xen/hypercall.h>
@@ -75,3 +76,52 @@ int xen_acpi_notify_hypervisor_extended_sleep(u8 sleep_state,
return xen_acpi_notify_hypervisor_state(sleep_state, val_a,
val_b, true);
}
+
+struct acpi_prt_entry {
+ struct acpi_pci_id id;
+ u8 pin;
+ acpi_handle link;
+ u32 index;
+};
+
+int xen_acpi_get_gsi_info(struct pci_dev *dev,
+ int *gsi_out,
+ int *trigger_out,
+ int *polarity_out)
+{
+ 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_out || !trigger_out || !polarity_out)
+ 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_out = gsi;
+ *trigger_out = trigger;
+ *polarity_out = polarity;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(xen_acpi_get_gsi_info);
diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c
index 3e162c1753e2..8ce27333f54b 100644
--- a/drivers/xen/xen-pciback/pci_stub.c
+++ b/drivers/xen/xen-pciback/pci_stub.c
@@ -21,6 +21,9 @@
#include <xen/events.h>
#include <xen/pci.h>
#include <xen/xen.h>
+#ifdef CONFIG_XEN_ACPI
+#include <xen/acpi.h>
+#endif
#include <asm/xen/hypervisor.h>
#include <xen/interface/physdev.h>
#include "pciback.h"
@@ -367,6 +370,9 @@ static int pcistub_match(struct pci_dev *dev)
static int pcistub_init_device(struct pci_dev *dev)
{
struct xen_pcibk_dev_data *dev_data;
+#ifdef CONFIG_XEN_ACPI
+ int gsi, trigger, polarity;
+#endif
int err = 0;
dev_dbg(&dev->dev, "initializing...\n");
@@ -435,6 +441,20 @@ static int pcistub_init_device(struct pci_dev *dev)
goto config_release;
pci_restore_state(dev);
}
+
+#ifdef CONFIG_XEN_ACPI
+ if (xen_initial_domain() && xen_pvh_domain()) {
+ err = xen_acpi_get_gsi_info(dev, &gsi, &trigger, &polarity);
+ if (err) {
+ dev_err(&dev->dev, "Fail to get gsi info!\n");
+ goto config_release;
+ }
+ err = xen_pvh_setup_gsi(gsi, trigger, polarity);
+ if (err)
+ goto config_release;
+ }
+#endif
+
/* 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 0687a442fec7..02ded9f53a6b 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -362,6 +362,7 @@ 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..3bcfe82d9078 100644
--- a/include/xen/acpi.h
+++ b/include/xen/acpi.h
@@ -67,10 +67,28 @@ static inline void xen_acpi_sleep_register(void)
acpi_suspend_lowlevel = xen_acpi_suspend_lowlevel;
}
}
+int xen_pvh_setup_gsi(int gsi, int trigger, int polarity);
+int xen_acpi_get_gsi_info(struct pci_dev *dev,
+ int *gsi_out,
+ int *trigger_out,
+ int *polarity_out);
#else
static inline void xen_acpi_sleep_register(void)
{
}
+
+static inline int xen_pvh_setup_gsi(int gsi, int trigger, int polarity)
+{
+ return -1;
+}
+
+static inline int xen_acpi_get_gsi_info(struct pci_dev *dev,
+ int *gsi_out,
+ int *trigger_out,
+ int *polarity_out)
+{
+ return -1;
+}
#endif
#endif /* _XEN_ACPI_H */
--
2.34.1
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