This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


[Xen-devel] [PATCH 16/23] x86: Introduce x86_msi_ops

To: linux-kernel@xxxxxxxxxxxxxxx
Subject: [Xen-devel] [PATCH 16/23] x86: Introduce x86_msi_ops
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Tue, 12 Oct 2010 11:44:24 -0400
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, x86@xxxxxxxxxx, Jan Beulich <JBeulich@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>, Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Delivery-date: Tue, 12 Oct 2010 09:23:05 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <1286898271-32018-1-git-send-email-konrad.wilk@xxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <1286898271-32018-1-git-send-email-konrad.wilk@xxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

Introduce an x86 specific indirect mechanism to setup MSIs.
The MSI setup functions become function pointers in an x86_msi_ops
struct, that defaults to the implementation in io_apic.c and msi.c.

[v2: Use HAVE_DEFAULT_* knobs]
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
 arch/x86/include/asm/pci.h      |   33 +++++++++++++++++++++++++++++++--
 arch/x86/include/asm/x86_init.h |    9 +++++++++
 arch/x86/kernel/apic/io_apic.c  |    4 ++--
 arch/x86/kernel/x86_init.c      |    7 +++++++
 4 files changed, 49 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index d395540..ca0437c 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -7,6 +7,7 @@
 #include <linux/string.h>
 #include <asm/scatterlist.h>
 #include <asm/io.h>
+#include <asm/x86_init.h>
 #ifdef __KERNEL__
@@ -94,8 +95,36 @@ static inline void early_quirks(void) { }
 extern void pci_iommu_alloc(void);
-/* MSI arch hook */
-#define arch_setup_msi_irqs arch_setup_msi_irqs
+/* MSI arch specific hooks */
+static inline int x86_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+       return x86_msi.setup_msi_irqs(dev, nvec, type);
+static inline void x86_teardown_msi_irqs(struct pci_dev *dev)
+       x86_msi.teardown_msi_irqs(dev);
+static inline void x86_teardown_msi_irq(unsigned int irq)
+       x86_msi.teardown_msi_irq(irq);
+#define arch_setup_msi_irqs x86_setup_msi_irqs
+#define arch_teardown_msi_irqs x86_teardown_msi_irqs
+#define arch_teardown_msi_irq x86_teardown_msi_irq
+/* implemented in arch/x86/kernel/apic/io_apic. */
+int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
+void native_teardown_msi_irq(unsigned int irq);
+/* default to the implementation in drivers/lib/msi.c */
+void default_teardown_msi_irqs(struct pci_dev *dev);
+#define native_setup_msi_irqs          NULL
+#define native_teardown_msi_irq                NULL
+#define default_teardown_msi_irqs      NULL
 #define PCI_DMA_BUS_IS_PHYS (dma_ops->is_phys)
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index baa579c..64642ad 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -154,9 +154,18 @@ struct x86_platform_ops {
        int (*i8042_detect)(void);
+struct pci_dev;
+struct x86_msi_ops {
+       int (*setup_msi_irqs)(struct pci_dev *dev, int nvec, int type);
+       void (*teardown_msi_irq)(unsigned int irq);
+       void (*teardown_msi_irqs)(struct pci_dev *dev);
 extern struct x86_init_ops x86_init;
 extern struct x86_cpuinit_ops x86_cpuinit;
 extern struct x86_platform_ops x86_platform;
+extern struct x86_msi_ops x86_msi;
 extern void x86_init_noop(void);
 extern void x86_init_uint_noop(unsigned int unused);
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 4c9b2b9..1bfc6d1 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3533,7 +3533,7 @@ static int setup_msi_irq(struct pci_dev *dev, struct 
msi_desc *msidesc, int irq)
        return 0;
-int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
        unsigned int irq;
        int ret, sub_handle;
@@ -3594,7 +3594,7 @@ error:
        return ret;
-void arch_teardown_msi_irq(unsigned int irq)
+void native_teardown_msi_irq(unsigned int irq)
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index cd6da6b..ceb2911 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -6,10 +6,12 @@
 #include <linux/init.h>
 #include <linux/ioport.h>
 #include <linux/module.h>
+#include <linux/pci.h>
 #include <asm/bios_ebda.h>
 #include <asm/paravirt.h>
 #include <asm/pci_x86.h>
+#include <asm/pci.h>
 #include <asm/mpspec.h>
 #include <asm/setup.h>
 #include <asm/apic.h>
@@ -99,3 +101,8 @@ struct x86_platform_ops x86_platform = {
+struct x86_msi_ops x86_msi = {
+       .setup_msi_irqs = native_setup_msi_irqs,
+       .teardown_msi_irq = native_teardown_msi_irq,
+       .teardown_msi_irqs = default_teardown_msi_irqs,

Xen-devel mailing list

<Prev in Thread] Current Thread [Next in Thread>