[PATCH] genirq: x86_64 irq: Move msi message composition into io_apic.c

This removes the hardcoded assumption that irq == vector in the msi
composition code, and it allows the msi message composition to setup logical
mode, or lowest priorirty delivery mode as we do for other apic interrupts,
and with the same selection criteria.

Basically this moves the problem of what is in the msi message into the
architecture irq management code where it belongs.  Not in a generic layer
that doesn't have enough information to compose msi messages properly.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Rajesh Shah <rajesh.shah@intel.com>
Cc: Andi Kleen <ak@muc.de>
Cc: "Protasevich, Natalie" <Natalie.Protasevich@UNISYS.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 123 insertions, 5 deletions

diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index fd52fcb6fa16..437b6f96cc80 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -26,6 +26,7 @@
 #include <linux/delay.h>
 #include <linux/sched.h>
 #include <linux/smp_lock.h>
+#include <linux/pci.h>
 #include <linux/mc146818rtc.h>
 #include <linux/acpi.h>
 #include <linux/sysdev.h>
@@ -41,6 +42,7 @@
 #include <asm/acpi.h>
 #include <asm/dma.h>
 #include <asm/nmi.h>
+#include <asm/msidef.h>
 
 #define __apicdebuginit  __init
 
@@ -1739,6 +1741,78 @@ void destroy_irq(unsigned int irq)
 }
 #endif
 
+/*
+ * MSI mesage composition
+ */
+#ifdef CONFIG_PCI_MSI
+static int msi_msg_setup(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
+{
+        /* For now always this code always uses physical delivery
+         * mode.
+         */
+        int vector;
+        unsigned dest;
+
+        vector = assign_irq_vector(irq);
+        if (vector >= 0) {
+                cpumask_t tmp;
+
+                cpus_clear(tmp);
+                cpu_set(first_cpu(cpu_online_map), tmp);
+                dest = cpu_mask_to_apicid(tmp);
+
+                msg->address_hi = MSI_ADDR_BASE_HI;
+                msg->address_lo =
+                        MSI_ADDR_BASE_LO |
+                        ((INT_DEST_MODE == 0) ?
+                                MSI_ADDR_DEST_MODE_PHYSICAL:
+                                MSI_ADDR_DEST_MODE_LOGICAL) |
+                        ((INT_DELIVERY_MODE != dest_LowestPrio) ?
+                                MSI_ADDR_REDIRECTION_CPU:
+                                MSI_ADDR_REDIRECTION_LOWPRI) |
+                        MSI_ADDR_DEST_ID(dest);
+
+                msg->data =
+                        MSI_DATA_TRIGGER_EDGE |
+                        MSI_DATA_LEVEL_ASSERT |
+                        ((INT_DELIVERY_MODE != dest_LowestPrio) ?
+                                MSI_DATA_DELIVERY_FIXED:
+                                MSI_DATA_DELIVERY_LOWPRI) |
+                        MSI_DATA_VECTOR(vector);
+        }
+        return vector;
+}
+
+static void msi_msg_teardown(unsigned int irq)
+{
+        return;
+}
+
+static void msi_msg_set_affinity(unsigned int irq, cpumask_t mask, struct msi_msg *msg)
+{
+        int vector;
+        unsigned dest;
+
+        vector = assign_irq_vector(irq);
+        if (vector > 0) {
+                dest = cpu_mask_to_apicid(mask);
+
+                msg->data &= ~MSI_DATA_VECTOR_MASK;
+                msg->data |= MSI_DATA_VECTOR(vector);
+                msg->address_lo &= ~MSI_ADDR_DEST_ID_MASK;
+                msg->address_lo |= MSI_ADDR_DEST_ID(dest);
+        }
+}
+
+struct msi_ops arch_msi_ops = {
+        .needs_64bit_address = 0,
+        .setup = msi_msg_setup,
+        .teardown = msi_msg_teardown,
+        .target = msi_msg_set_affinity,
+};
+
+#endif
+
 /* --------------------------------------------------------------------------
                           ACPI-based IOAPIC Configuration
    -------------------------------------------------------------------------- */
diff --git a/include/asm-x86_64/msi.h b/include/asm-x86_64/msi.h
index 3ad2346624b2..1876fda52ae3 100644
--- a/include/asm-x86_64/msi.h
+++ b/include/asm-x86_64/msi.h
@@ -10,14 +10,11 @@
 #include <asm/mach_apic.h>
 #include <asm/smp.h>
 
-#define LAST_DEVICE_VECTOR      (FIRST_SYSTEM_VECTOR - 1)
-#define MSI_TARGET_CPU_SHIFT    12
-
-extern struct msi_ops msi_apic_ops;
+extern struct msi_ops arch_msi_ops;
 
 static inline int msi_arch_init(void)
 {
-        msi_register(&msi_apic_ops);
+        msi_register(&arch_msi_ops);
         return 0;
 }
 
diff --git a/include/asm-x86_64/msidef.h b/include/asm-x86_64/msidef.h
new file mode 100644
index 000000000000..5b8acddb70fb
--- /dev/null
+++ b/include/asm-x86_64/msidef.h
@@ -0,0 +1,47 @@
+#ifndef ASM_MSIDEF_H
+#define ASM_MSIDEF_H
+
+/*
+ * Constants for Intel APIC based MSI messages.
+ */
+
+/*
+ * Shifts for MSI data
+ */
+
+#define MSI_DATA_VECTOR_SHIFT           0
+#define  MSI_DATA_VECTOR_MASK           0x000000ff
+#define  MSI_DATA_VECTOR(v)             (((v) << MSI_DATA_VECTOR_SHIFT) & MSI_DATA_VECTOR_MASK)
+
+#define MSI_DATA_DELIVERY_MODE_SHIFT    8
+#define  MSI_DATA_DELIVERY_FIXED        (0 << MSI_DATA_DELIVERY_MODE_SHIFT)
+#define  MSI_DATA_DELIVERY_LOWPRI       (1 << MSI_DATA_DELIVERY_MODE_SHIFT)
+
+#define MSI_DATA_LEVEL_SHIFT            14
+#define  MSI_DATA_LEVEL_DEASSERT        (0 << MSI_DATA_LEVEL_SHIFT)
+#define  MSI_DATA_LEVEL_ASSERT          (1 << MSI_DATA_LEVEL_SHIFT)
+
+#define MSI_DATA_TRIGGER_SHIFT          15
+#define  MSI_DATA_TRIGGER_EDGE          (0 << MSI_DATA_TRIGGER_SHIFT)
+#define  MSI_DATA_TRIGGER_LEVEL         (1 << MSI_DATA_TRIGGER_SHIFT)
+
+/*
+ * Shift/mask fields for msi address
+ */
+
+#define MSI_ADDR_BASE_HI                0
+#define MSI_ADDR_BASE_LO                0xfee00000
+
+#define MSI_ADDR_DEST_MODE_SHIFT        2
+#define  MSI_ADDR_DEST_MODE_PHYSICAL    (0 << MSI_ADDR_DEST_MODE_SHIFT)
+#define  MSI_ADDR_DEST_MODE_LOGICAL     (1 << MSI_ADDR_DEST_MODE_SHIFT)
+
+#define MSI_ADDR_REDIRECTION_SHIFT      3
+#define  MSI_ADDR_REDIRECTION_CPU       (0 << MSI_ADDR_REDIRECTION_SHIFT) /* dedicated cpu */
+#define  MSI_ADDR_REDIRECTION_LOWPRI    (1 << MSI_ADDR_REDIRECTION_SHIFT) /* lowest priority */
+
+#define MSI_ADDR_DEST_ID_SHIFT          12
+#define  MSI_ADDR_DEST_ID_MASK          0x00ffff0
+#define  MSI_ADDR_DEST_ID(dest)         (((dest) << MSI_ADDR_DEST_ID_SHIFT) & MSI_ADDR_DEST_ID_MASK)
+
+#endif /* ASM_MSIDEF_H */