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| Started by | Arnd Bergmann <arnd@arndb.de> |
|---|---|
| First post | 2017-02-14 23:00 +0100 |
| Last post | 2017-02-16 15:40 +0100 |
| Articles | 2 — 2 participants |
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[PATCH] genirq/msi: add stubs for get_cached_msi_msg/pci_write_msi_msg Arnd Bergmann <arnd@arndb.de> - 2017-02-14 23:00 +0100
[tip:irq/core] genirq/msi: Add stubs for get_cached_msi_msg/pci_write_msi_msg tip-bot for Arnd Bergmann <tipbot@zytor.com> - 2017-02-16 15:40 +0100
| From | Arnd Bergmann <arnd@arndb.de> |
|---|---|
| Date | 2017-02-14 23:00 +0100 |
| Subject | [PATCH] genirq/msi: add stubs for get_cached_msi_msg/pci_write_msi_msg |
| Message-ID | <taTiF-7dj-1@gated-at.bofh.it> |
A bug fix to the MSIx handling in vfio added references to functions
that may not be defined if MSI is disabled in the kernel, resulting in
this link error:
drivers/built-in.o: In function `vfio_msi_set_vector_signal':
:(.text+0x450808): undefined reference to `get_cached_msi_msg'
:(.text+0x45080c): undefined reference to `write_msi_msg'
As suggested by Alex Williamson, this adds stub implementations for
get_cached_msi_msg() and pci_write_msi_msg().
In case this bugfix gets backported, please note that the #ifdef
has changed over time, originally both functions were implemented
in drivers/pci/msi.c and controlled by CONFIG_PCI_MSI, while nowadays
get_cached_msi_msg() is part of the generic MSI support and can be
used without PCI.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: b8f02af096b1 ("vfio/pci: Restore MSIx message prior to enabling")
Link: https://lkml.org/lkml/2014/10/13/124
---
I had a workaround for this hidden in my randconfig tree but have
now stumbled over it again, sorry for not following up a couple of years
earlier.
---
include/linux/msi.h | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 0db320b7bb15..a83b84ff70e5 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -17,7 +17,13 @@ struct msi_desc;
struct pci_dev;
struct platform_msi_priv_data;
void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
+#ifdef CONFIG_GENERIC_MSI_IRQ
void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
+#else
+static inline void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)
+{
+}
+#endif
typedef void (*irq_write_msi_msg_t)(struct msi_desc *desc,
struct msi_msg *msg);
@@ -116,11 +122,15 @@ struct msi_desc {
struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc);
void *msi_desc_to_pci_sysdata(struct msi_desc *desc);
+void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
#else /* CONFIG_PCI_MSI */
static inline void *msi_desc_to_pci_sysdata(struct msi_desc *desc)
{
return NULL;
}
+static inline void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg)
+{
+}
#endif /* CONFIG_PCI_MSI */
struct msi_desc *alloc_msi_entry(struct device *dev, int nvec,
@@ -128,7 +138,6 @@ struct msi_desc *alloc_msi_entry(struct device *dev, int nvec,
void free_msi_entry(struct msi_desc *entry);
void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
-void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
u32 __pci_msix_desc_mask_irq(struct msi_desc *desc, u32 flag);
u32 __pci_msi_desc_mask_irq(struct msi_desc *desc, u32 mask, u32 flag);
--
2.9.0
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| From | tip-bot for Arnd Bergmann <tipbot@zytor.com> |
|---|---|
| Date | 2017-02-16 15:40 +0100 |
| Subject | [tip:irq/core] genirq/msi: Add stubs for get_cached_msi_msg/pci_write_msi_msg |
| Message-ID | <tbvnY-7s2-15@gated-at.bofh.it> |
| In reply to | #1580893 |
Commit-ID: 2f44e29cef006a4b0a4ecf7d4c5aac7d0fbb505c
Gitweb: http://git.kernel.org/tip/2f44e29cef006a4b0a4ecf7d4c5aac7d0fbb505c
Author: Arnd Bergmann <arnd@arndb.de>
AuthorDate: Tue, 14 Feb 2017 22:53:12 +0100
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Thu, 16 Feb 2017 15:32:19 +0100
genirq/msi: Add stubs for get_cached_msi_msg/pci_write_msi_msg
A bug fix to the MSIx handling in vfio added references to functions
that may not be defined if MSI is disabled in the kernel, resulting in
this link error:
drivers/built-in.o: In function `vfio_msi_set_vector_signal':
:(.text+0x450808): undefined reference to `get_cached_msi_msg'
:(.text+0x45080c): undefined reference to `write_msi_msg'
As suggested by Alex Williamson, add stub implementations for
get_cached_msi_msg() and pci_write_msi_msg().
In case this bugfix gets backported, please note that the #ifdef
has changed over time, originally both functions were implemented
in drivers/pci/msi.c and controlled by CONFIG_PCI_MSI, while nowadays
get_cached_msi_msg() is part of the generic MSI support and can be
used without PCI.
Fixes: b8f02af096b1 ("vfio/pci: Restore MSIx message prior to enabling")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Bart Van Assche <bart.vanassche@sandisk.com>
Link: http://lkml.kernel.org/r/1413190208.4202.34.camel@ul30vt.home
Link: http://lkml.kernel.org/r/20170214215343.3307861-1-arnd@arndb.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/msi.h | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 0db320b..a83b84f 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -17,7 +17,13 @@ struct msi_desc;
struct pci_dev;
struct platform_msi_priv_data;
void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
+#ifdef CONFIG_GENERIC_MSI_IRQ
void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
+#else
+static inline void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)
+{
+}
+#endif
typedef void (*irq_write_msi_msg_t)(struct msi_desc *desc,
struct msi_msg *msg);
@@ -116,11 +122,15 @@ struct msi_desc {
struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc);
void *msi_desc_to_pci_sysdata(struct msi_desc *desc);
+void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
#else /* CONFIG_PCI_MSI */
static inline void *msi_desc_to_pci_sysdata(struct msi_desc *desc)
{
return NULL;
}
+static inline void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg)
+{
+}
#endif /* CONFIG_PCI_MSI */
struct msi_desc *alloc_msi_entry(struct device *dev, int nvec,
@@ -128,7 +138,6 @@ struct msi_desc *alloc_msi_entry(struct device *dev, int nvec,
void free_msi_entry(struct msi_desc *entry);
void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
-void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
u32 __pci_msix_desc_mask_irq(struct msi_desc *desc, u32 flag);
u32 __pci_msi_desc_mask_irq(struct msi_desc *desc, u32 mask, u32 flag);
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