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authorDean Nelson <dcn@sgi.com>2008-10-02 12:18:21 -0500
committerIngo Molnar <mingo@elte.hu>2008-10-16 16:53:12 +0200
commit4173a0e7371ece227559b44943c6fd456ee470d1 (patch)
treee9a6dd475bfc72b373c1db13c21c8d82591636ec /arch/x86/kernel/uv_irq.c
parent5f79f2f2ad39b5177c52ed08ffd066ea0c1da924 (diff)
x86, UV: add uv_setup_irq() and uv_teardown_irq() functions, v3
Provide a means for UV interrupt MMRs to be setup with the message to be sent when an MSI is raised. Signed-off-by: Dean Nelson <dcn@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/uv_irq.c')
-rw-r--r--arch/x86/kernel/uv_irq.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/arch/x86/kernel/uv_irq.c b/arch/x86/kernel/uv_irq.c
new file mode 100644
index 000000000000..6bd26c91c30b
--- /dev/null
+++ b/arch/x86/kernel/uv_irq.c
@@ -0,0 +1,77 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * SGI UV IRQ functions
+ *
+ * Copyright (C) 2008 Silicon Graphics, Inc. All rights reserved.
+ */
+
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <asm/uv/uv_irq.h>
+
+static void uv_noop(unsigned int irq)
+{
+}
+
+static unsigned int uv_noop_ret(unsigned int irq)
+{
+ return 0;
+}
+
+static void uv_ack_apic(unsigned int irq)
+{
+ ack_APIC_irq();
+}
+
+struct irq_chip uv_irq_chip = {
+ .name = "UV-CORE",
+ .startup = uv_noop_ret,
+ .shutdown = uv_noop,
+ .enable = uv_noop,
+ .disable = uv_noop,
+ .ack = uv_noop,
+ .mask = uv_noop,
+ .unmask = uv_noop,
+ .eoi = uv_ack_apic,
+ .end = uv_noop,
+};
+
+/*
+ * Set up a mapping of an available irq and vector, and enable the specified
+ * MMR that defines the MSI that is to be sent to the specified CPU when an
+ * interrupt is raised.
+ */
+int uv_setup_irq(char *irq_name, int cpu, int mmr_blade,
+ unsigned long mmr_offset)
+{
+ int irq;
+ int ret;
+
+ irq = create_irq();
+ if (irq <= 0)
+ return -EBUSY;
+
+ ret = arch_enable_uv_irq(irq_name, irq, cpu, mmr_blade, mmr_offset);
+ if (ret != irq)
+ destroy_irq(irq);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(uv_setup_irq);
+
+/*
+ * Tear down a mapping of an irq and vector, and disable the specified MMR that
+ * defined the MSI that was to be sent to the specified CPU when an interrupt
+ * was raised.
+ *
+ * Set mmr_blade and mmr_offset to what was passed in on uv_setup_irq().
+ */
+void uv_teardown_irq(unsigned int irq, int mmr_blade, unsigned long mmr_offset)
+{
+ arch_disable_uv_irq(mmr_blade, mmr_offset);
+ destroy_irq(irq);
+}
+EXPORT_SYMBOL_GPL(uv_teardown_irq);