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Message-ID: <20081002114556.GA25633@sgi.com>
Date: Thu, 2 Oct 2008 06:45:56 -0500
From: Dean Nelson <dcn@....com>
To: Ingo Molnar <mingo@...e.hu>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>,
Alan Mayer <ajm@....com>, jeremy@...p.org,
rusty@...tcorp.com.au, suresh.b.siddha@...el.com,
torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
"H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>,
Yinghai Lu <Yinghai.lu@....com>
Subject: [PATCH] x86, UV: add uv_setup_irq() and uv_teardown_irq() functions v.2
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@....com>
---
On Thu, Oct 02, 2008 at 10:42:14AM +0200, Ingo Molnar wrote:
>
> * Dean Nelson <dcn@....com> wrote:
>
> > +static struct irq_chip uv_irq_chip = {
> > + .name = "UV_MSI",
> > + .startup = noop_ret,
> > + .shutdown = noop,
> > + .enable = noop,
> > + .disable = noop,
> > + .ack = noop,
> > + .mask = noop,
> > + .unmask = noop,
> > + .eoi = ack_apic,
> > + .end = noop,
> > +};
>
> hm, why isnt this in uv_irq.c?
Good question. Sometimes the obvious gets overlooked in the midst of
having rewritten a patch a dozen different ways. It's now in uv_irq.c.
> > Index: linux/kernel/irq/chip.c
> > ===================================================================
> > --- linux.orig/kernel/irq/chip.c 2008-09-30 09:07:42.000000000 -0500
> > +++ linux/kernel/irq/chip.c 2008-09-30 09:07:44.000000000 -0500
> > @@ -79,6 +79,7 @@ void dynamic_irq_cleanup(unsigned int ir
> > desc->chip_data = NULL;
> > desc->handle_irq = handle_bad_irq;
> > desc->chip = &no_irq_chip;
> > + desc->name = "none";
> > spin_unlock_irqrestore(&desc->lock, flags);
>
> unrelated change that belongs into a separate patch.
Agreed. The change is needed by drivers/misc/sgi-xp once it has been
modified to call uv_setup_irq() and uv_teardown_irq(). I'll move this
change into that patch (or should it be in a patch all by itself?).
The patch to drivers/misc/sgi-xp to call the functions introduced by
this patch, will be submitted shortly.
Thanks,
Dean
arch/x86/kernel/Makefile | 2 -
arch/x86/kernel/io_apic.c | 68 +++++++++++++++++++++++++++++++++++
arch/x86/kernel/uv_irq.c | 77 ++++++++++++++++++++++++++++++++++++++++
include/asm-x86/uv/uv_irq.h | 36 ++++++++++++++++++
4 files changed, 182 insertions(+), 1 deletion(-)
Index: linux/arch/x86/kernel/io_apic.c
===================================================================
--- linux.orig/arch/x86/kernel/io_apic.c 2008-10-02 06:12:54.000000000 -0500
+++ linux/arch/x86/kernel/io_apic.c 2008-10-02 06:15:48.000000000 -0500
@@ -58,6 +58,8 @@
#include <asm/setup.h>
#include <asm/irq_remapping.h>
#include <asm/hpet.h>
+#include <asm/uv/uv_hub.h>
+#include <asm/uv/uv_irq.h>
#include <mach_ipi.h>
#include <mach_apic.h>
@@ -3694,6 +3696,72 @@ int arch_setup_ht_irq(unsigned int irq,
}
#endif /* CONFIG_HT_IRQ */
+#ifdef CONFIG_X86_64
+/*
+ * Re-target the irq to the specified CPU and enable the specified MMR located
+ * on the specified blade to allow the sending of MSIs to the specified CPU.
+ */
+int arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade,
+ unsigned long mmr_offset)
+{
+ const cpumask_t *eligible_cpu = get_cpu_mask(cpu);
+ struct irq_cfg *cfg;
+ int mmr_pnode;
+ unsigned long mmr_value;
+ struct uv_IO_APIC_route_entry *entry;
+ unsigned long flags;
+ int err;
+
+ err = assign_irq_vector(irq, *eligible_cpu);
+ if (err != 0)
+ return err;
+
+ spin_lock_irqsave(&vector_lock, flags);
+ set_irq_chip_and_handler_name(irq, &uv_irq_chip, handle_percpu_irq,
+ irq_name);
+ spin_unlock_irqrestore(&vector_lock, flags);
+
+ cfg = irq_cfg(irq);
+
+ mmr_value = 0;
+ entry = (struct uv_IO_APIC_route_entry *)&mmr_value;
+ BUG_ON(sizeof(struct uv_IO_APIC_route_entry) != sizeof(unsigned long));
+
+ entry->vector = cfg->vector;
+ entry->delivery_mode = INT_DELIVERY_MODE;
+ entry->dest_mode = INT_DEST_MODE;
+ entry->polarity = 0;
+ entry->trigger = 0;
+ entry->mask = 0;
+ entry->dest = cpu_mask_to_apicid(*eligible_cpu);
+
+ mmr_pnode = uv_blade_to_pnode(mmr_blade);
+ uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value);
+
+ return irq;
+}
+
+/*
+ * Disable the specified MMR located on the specified blade so that MSIs are
+ * longer allowed to be sent.
+ */
+void arch_disable_uv_irq(int mmr_blade, unsigned long mmr_offset)
+{
+ unsigned long mmr_value;
+ struct uv_IO_APIC_route_entry *entry;
+ int mmr_pnode;
+
+ mmr_value = 0;
+ entry = (struct uv_IO_APIC_route_entry *)&mmr_value;
+ BUG_ON(sizeof(struct uv_IO_APIC_route_entry) != sizeof(unsigned long));
+
+ entry->mask = 1;
+
+ mmr_pnode = uv_blade_to_pnode(mmr_blade);
+ uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value);
+}
+#endif /* CONFIG_X86_64 */
+
int __init io_apic_get_redir_entries (int ioapic)
{
union IO_APIC_reg_01 reg_01;
Index: linux/arch/x86/kernel/uv_irq.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux/arch/x86/kernel/uv_irq.c 2008-10-02 06:22:14.000000000 -0500
@@ -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_MSI",
+ .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(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(uv_teardown_irq);
Index: linux/include/asm-x86/uv/uv_irq.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux/include/asm-x86/uv/uv_irq.h 2008-10-02 06:15:53.000000000 -0500
@@ -0,0 +1,36 @@
+/*
+ * 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 definitions
+ *
+ * Copyright (C) 2008 Silicon Graphics, Inc. All rights reserved.
+ */
+
+#ifndef ASM_X86__UV__UV_IRQ_H
+#define ASM_X86__UV__UV_IRQ_H
+
+/* If a generic version of this structure gets defined, eliminate this one. */
+struct uv_IO_APIC_route_entry {
+ __u64 vector : 8,
+ delivery_mode : 3,
+ dest_mode : 1,
+ delivery_status : 1,
+ polarity : 1,
+ __reserved_1 : 1,
+ trigger : 1,
+ mask : 1,
+ __reserved_2 : 15,
+ dest : 32;
+};
+
+extern struct irq_chip uv_irq_chip;
+
+extern int arch_enable_uv_irq(char *, unsigned int, int, int, unsigned long);
+extern void arch_disable_uv_irq(int, unsigned long);
+
+extern int uv_setup_irq(char *, int, int, unsigned long);
+extern void uv_teardown_irq(unsigned int, int, unsigned long);
+
+#endif /* ASM_X86__UV__UV_IRQ_H */
Index: linux/arch/x86/kernel/Makefile
===================================================================
--- linux.orig/arch/x86/kernel/Makefile 2008-10-02 06:12:54.000000000 -0500
+++ linux/arch/x86/kernel/Makefile 2008-10-02 06:13:01.000000000 -0500
@@ -107,7 +107,7 @@ obj-$(CONFIG_OLPC) += olpc.o
# 64 bit specific files
ifeq ($(CONFIG_X86_64),y)
obj-y += genapic_64.o genapic_flat_64.o genx2apic_uv_x.o tlb_uv.o
- obj-y += bios_uv.o uv_sysfs.o
+ obj-y += bios_uv.o uv_sysfs.o uv_irq.o
obj-y += genx2apic_cluster.o
obj-y += genx2apic_phys.o
obj-$(CONFIG_X86_PM_TIMER) += pmtimer_64.o
--
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