[PATCH 0/19] Improve IRQ remapping abstraction in x86 core code

[PATCH 0/19] Improve IRQ remapping abstraction in x86 core code

[Joerg Roedel]

Hi,

here is a patch-set to clean-up and the x86 APIC and IO-APIC code from
special cases for interrupt remapping. The problems are mostly solved by
introducing new function pointers to the x86_msi_ops and x86_io_apic_ops
which are changed when interrupt remapping gets enabled.

With this patch-set all checks for irq_remapping_enabled and
irq_remapped() happen only in the IRQ remapping specific code. A few
CONFIG_IRQ_REMAP checks are gone as well. The patches are based on Linux
v3.6-rc1.

The code was tested on various machines (AMD and Intel based) with and
without IRQ remapping in use. I have found no issues so far, but broader
testing is certainly necessary.

For anyone interested in a git-tree I pushed this code to

	git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git ioapic-cleanups

Comments appreciated :-)

Regards,
	
	Joerg

Diffstat:

 arch/x86/include/asm/hpet.h          |    4 +-
 arch/x86/include/asm/hw_irq.h        |   15 +-
 arch/x86/include/asm/io_apic.h       |   21 ++
 arch/x86/include/asm/irq_remapping.h |   40 ++--
 arch/x86/include/asm/pci.h           |    2 +
 arch/x86/include/asm/x86_init.h      |   30 ++-
 arch/x86/kernel/apic/apic.c          |   28 ++-
 arch/x86/kernel/apic/io_apic.c       |  375 +++++++++++++---------------------
 arch/x86/kernel/hpet.c               |    2 +-
 arch/x86/kernel/x86_init.c           |   25 ++-
 drivers/iommu/dmar.c                 |    2 +
 drivers/iommu/intel-iommu.c          |    2 +
 drivers/iommu/intel_irq_remapping.c  |    8 +
 drivers/iommu/irq_remapping.c        |  186 ++++++++++++++++-
 drivers/iommu/irq_remapping.h        |    3 +
 15 files changed, 444 insertions(+), 299 deletions(-)

[PATCH 01/19] x86, apic: Move irq_remapping_enabled checks into IRQ-remapping code

[Joerg Roedel]

Move the three easy to move checks in the x86' apic.c file
into the IRQ-remapping code.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/kernel/apic/apic.c   |    9 +++------
 drivers/iommu/irq_remapping.c |   11 +++++++++--
 2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 24deb30..41681b3 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1444,8 +1444,7 @@ void __init bsp_end_local_APIC_setup(void)
 	 * Now that local APIC setup is completed for BP, configure the fault
 	 * handling for interrupt remapping.
 	 */
-	if (irq_remapping_enabled)
-		irq_remap_enable_fault_handling();
+	irq_remap_enable_fault_handling();
 
 }
 
@@ -2218,8 +2217,7 @@ static int lapic_suspend(void)
 	local_irq_save(flags);
 	disable_local_APIC();
 
-	if (irq_remapping_enabled)
-		irq_remapping_disable();
+	irq_remapping_disable();
 
 	local_irq_restore(flags);
 	return 0;
@@ -2287,8 +2285,7 @@ static void lapic_resume(void)
 	apic_write(APIC_ESR, 0);
 	apic_read(APIC_ESR);
 
-	if (irq_remapping_enabled)
-		irq_remapping_reenable(x2apic_mode);
+	irq_remapping_reenable(x2apic_mode);
 
 	local_irq_restore(flags);
 }
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 151690d..283a43f 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -82,7 +82,9 @@ int __init irq_remapping_enable(void)
 
 void irq_remapping_disable(void)
 {
-	if (!remap_ops || !remap_ops->disable)
+	if (!irq_remapping_enabled ||
+	    !remap_ops ||
+	    !remap_ops->disable)
 		return;
 
 	remap_ops->disable();
@@ -90,7 +92,9 @@ void irq_remapping_disable(void)
 
 int irq_remapping_reenable(int mode)
 {
-	if (!remap_ops || !remap_ops->reenable)
+	if (!irq_remapping_enabled ||
+	    !remap_ops ||
+	    !remap_ops->reenable)
 		return 0;
 
 	return remap_ops->reenable(mode);
@@ -98,6 +102,9 @@ int irq_remapping_reenable(int mode)
 
 int __init irq_remap_enable_fault_handling(void)
 {
+	if (!irq_remapping_enabled)
+		return 0;
+
 	if (!remap_ops || !remap_ops->enable_faulting)
 		return -ENODEV;
 
-- 
1.7.9.5

[PATCH 02/19] [RFC] x86, apic: Mask IO-APIC and PIC unconditionally on LAPIC resume

[Joerg Roedel]

IO-APIC and PIC use the same resume routines when IRQ
remapping is enabled or disabled. So it should be safe to
mask the other APICs for the IRQ-remapping-disabled case
too.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/kernel/apic/apic.c |   19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 41681b3..109380a 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2233,16 +2233,15 @@ static void lapic_resume(void)
 		return;
 
 	local_irq_save(flags);
-	if (irq_remapping_enabled) {
-		/*
-		 * IO-APIC and PIC have their own resume routines.
-		 * We just mask them here to make sure the interrupt
-		 * subsystem is completely quiet while we enable x2apic
-		 * and interrupt-remapping.
-		 */
-		mask_ioapic_entries();
-		legacy_pic->mask_all();
-	}
+
+	/*
+	 * IO-APIC and PIC have their own resume routines.
+	 * We just mask them here to make sure the interrupt
+	 * subsystem is completely quiet while we enable x2apic
+	 * and interrupt-remapping.
+	 */
+	mask_ioapic_entries();
+	legacy_pic->mask_all();
 
 	if (x2apic_mode)
 		enable_x2apic();
-- 
1.7.9.5

[PATCH 03/19] x86, io_apic: Introduce x86_io_apic_ops.disable()

[Joerg Roedel]

This function pointer is used to call a system-specific
function for disabling the IO-APIC. Currently this is used
for IRQ remapping which has its own disable routine.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/io_apic.h  |    1 +
 arch/x86/include/asm/x86_init.h |    9 +++++----
 arch/x86/kernel/apic/io_apic.c  |   41 ++++++++++++++++++---------------------
 arch/x86/kernel/x86_init.c      |    9 +++++----
 drivers/iommu/irq_remapping.c   |   31 ++++++++++++++++++++++++++++-
 5 files changed, 60 insertions(+), 31 deletions(-)

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 73d8c53..57e5917 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -179,6 +179,7 @@ extern void __init native_io_apic_init_mappings(void);
 extern unsigned int native_io_apic_read(unsigned int apic, unsigned int reg);
 extern void native_io_apic_write(unsigned int apic, unsigned int reg, unsigned int val);
 extern void native_io_apic_modify(unsigned int apic, unsigned int reg, unsigned int val);
+extern void native_disable_io_apic(void);
 
 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
 {
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index 38155f6..8e1b44c 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -189,10 +189,11 @@ struct x86_msi_ops {
 };
 
 struct x86_io_apic_ops {
-	void		(*init)  (void);
-	unsigned int	(*read)  (unsigned int apic, unsigned int reg);
-	void		(*write) (unsigned int apic, unsigned int reg, unsigned int value);
-	void		(*modify)(unsigned int apic, unsigned int reg, unsigned int value);
+	void		(*init)   (void);
+	unsigned int	(*read)   (unsigned int apic, unsigned int reg);
+	void		(*write)  (unsigned int apic, unsigned int reg, unsigned int value);
+	void		(*modify) (unsigned int apic, unsigned int reg, unsigned int value);
+	void		(*disable)(void);
 };
 
 extern struct x86_init_ops x86_init;
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 406eee7..3b77b60 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1925,30 +1925,14 @@ void __init enable_IO_APIC(void)
 	clear_IO_APIC();
 }
 
-/*
- * Not an __init, needed by the reboot code
- */
-void disable_IO_APIC(void)
+void native_disable_io_apic(void)
 {
 	/*
-	 * Clear the IO-APIC before rebooting:
-	 */
-	clear_IO_APIC();
-
-	if (!legacy_pic->nr_legacy_irqs)
-		return;
-
-	/*
 	 * If the i8259 is routed through an IOAPIC
 	 * Put that IOAPIC in virtual wire mode
 	 * so legacy interrupts can be delivered.
-	 *
-	 * With interrupt-remapping, for now we will use virtual wire A mode,
-	 * as virtual wire B is little complex (need to configure both
-	 * IOAPIC RTE as well as interrupt-remapping table entry).
-	 * As this gets called during crash dump, keep this simple for now.
 	 */
-	if (ioapic_i8259.pin != -1 && !irq_remapping_enabled) {
+	if (ioapic_i8259.pin != -1) {
 		struct IO_APIC_route_entry entry;
 
 		memset(&entry, 0, sizeof(entry));
@@ -1968,12 +1952,25 @@ void disable_IO_APIC(void)
 		ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
 	}
 
+	if (cpu_has_apic || apic_from_smp_config())
+		disconnect_bsp_APIC(ioapic_i8259.pin != -1);
+
+}
+
+/*
+ * Not an __init, needed by the reboot code
+ */
+void disable_IO_APIC(void)
+{
 	/*
-	 * Use virtual wire A mode when interrupt remapping is enabled.
+	 * Clear the IO-APIC before rebooting:
 	 */
-	if (cpu_has_apic || apic_from_smp_config())
-		disconnect_bsp_APIC(!irq_remapping_enabled &&
-				ioapic_i8259.pin != -1);
+	clear_IO_APIC();
+
+	if (!legacy_pic->nr_legacy_irqs)
+		return;
+
+	x86_io_apic_ops.disable();
 }
 
 #ifdef CONFIG_X86_32
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index 9f3167e..3ea56c2 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -120,8 +120,9 @@ struct x86_msi_ops x86_msi = {
 };
 
 struct x86_io_apic_ops x86_io_apic_ops = {
-	.init	= native_io_apic_init_mappings,
-	.read	= native_io_apic_read,
-	.write	= native_io_apic_write,
-	.modify	= native_io_apic_modify,
+	.init			= native_io_apic_init_mappings,
+	.read			= native_io_apic_read,
+	.write			= native_io_apic_write,
+	.modify			= native_io_apic_modify,
+	.disable		= native_disable_io_apic,
 };
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 283a43f..f72a5e8 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -1,3 +1,4 @@
+#include <linux/cpumask.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/cpumask.h>
@@ -6,6 +7,9 @@
 
 #include <asm/hw_irq.h>
 #include <asm/irq_remapping.h>
+#include <asm/processor.h>
+#include <asm/x86_init.h>
+#include <asm/apic.h>
 
 #include "irq_remapping.h"
 
@@ -17,6 +21,24 @@ int no_x2apic_optout;
 
 static struct irq_remap_ops *remap_ops;
 
+static void irq_remapping_disable_io_apic(void)
+{
+	/*
+	 * With interrupt-remapping, for now we will use virtual wire A
+	 * mode, as virtual wire B is little complex (need to configure
+	 * both IOAPIC RTE as well as interrupt-remapping table entry).
+	 * As this gets called during crash dump, keep this simple for
+	 * now.
+	 */
+	if (cpu_has_apic || apic_from_smp_config())
+		disconnect_bsp_APIC(0);
+}
+
+static void __init irq_remapping_modify_x86_ops(void)
+{
+	x86_io_apic_ops.disable	=	irq_remapping_disable_io_apic;
+}
+
 static __init int setup_nointremap(char *str)
 {
 	disable_irq_remap = 1;
@@ -74,10 +96,17 @@ int __init irq_remapping_prepare(void)
 
 int __init irq_remapping_enable(void)
 {
+	int ret;
+
 	if (!remap_ops || !remap_ops->enable)
 		return -ENODEV;
 
-	return remap_ops->enable();
+	ret = remap_ops->enable();
+
+	if (irq_remapping_enabled)
+		irq_remapping_modify_x86_ops();
+
+	return ret;
 }
 
 void irq_remapping_disable(void)
-- 
1.7.9.5

[PATCH 04/19] x86, io_apic: Introduce x86_io_apic_ops.print_entries for debugging

[Joerg Roedel]

This call-back is used to dump IO-APIC entries for debugging
purposes into the kernel log. VT-d needs a special routine
for this and will overwrite the default.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/io_apic.h      |    2 +
 arch/x86/include/asm/x86_init.h     |    1 +
 arch/x86/kernel/apic/io_apic.c      |  109 ++++++++++++++++++-----------------
 arch/x86/kernel/x86_init.c          |    1 +
 drivers/iommu/intel_irq_remapping.c |    4 ++
 5 files changed, 64 insertions(+), 53 deletions(-)

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 57e5917..32ce9d2 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -180,6 +180,8 @@ extern unsigned int native_io_apic_read(unsigned int apic, unsigned int reg);
 extern void native_io_apic_write(unsigned int apic, unsigned int reg, unsigned int val);
 extern void native_io_apic_modify(unsigned int apic, unsigned int reg, unsigned int val);
 extern void native_disable_io_apic(void);
+extern void native_io_apic_print_entries(unsigned int apic, unsigned int nr_entries);
+extern void intel_ir_io_apic_print_entries(unsigned int apic, unsigned int nr_entries);
 
 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
 {
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index 8e1b44c..be8e9a6 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -194,6 +194,7 @@ struct x86_io_apic_ops {
 	void		(*write)  (unsigned int apic, unsigned int reg, unsigned int value);
 	void		(*modify) (unsigned int apic, unsigned int reg, unsigned int value);
 	void		(*disable)(void);
+	void		(*print_entries)(unsigned int apic, unsigned int nr_entries);
 };
 
 extern struct x86_init_ops x86_init;
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 3b77b60..c3a05e9 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1517,9 +1517,63 @@ static void __init setup_timer_IRQ0_pin(unsigned int ioapic_idx,
 	ioapic_write_entry(ioapic_idx, pin, entry);
 }
 
-__apicdebuginit(void) print_IO_APIC(int ioapic_idx)
+void native_io_apic_print_entries(unsigned int apic, unsigned int nr_entries)
+{
+	int i;
+
+	pr_debug(" NR Dst Mask Trig IRR Pol Stat Dmod Deli Vect:\n");
+
+	for (i = 0; i <= nr_entries; i++) {
+		struct IO_APIC_route_entry entry;
+
+		entry = ioapic_read_entry(apic, i);
+
+		pr_debug(" %02x %02X  ", i, entry.dest);
+		pr_cont("%1d    %1d    %1d   %1d   %1d    "
+			"%1d    %1d    %02X\n",
+			entry.mask,
+			entry.trigger,
+			entry.irr,
+			entry.polarity,
+			entry.delivery_status,
+			entry.dest_mode,
+			entry.delivery_mode,
+			entry.vector);
+	}
+}
+
+void intel_ir_io_apic_print_entries(unsigned int apic,
+				    unsigned int nr_entries)
 {
 	int i;
+
+	pr_debug(" NR Indx Fmt Mask Trig IRR Pol Stat Indx2 Zero Vect:\n");
+
+	for (i = 0; i <= nr_entries; i++) {
+		struct IR_IO_APIC_route_entry *ir_entry;
+		struct IO_APIC_route_entry entry;
+
+		entry = ioapic_read_entry(apic, i);
+
+		ir_entry = (struct IR_IO_APIC_route_entry *)&entry;
+
+		pr_debug(" %02x %04X ", i, ir_entry->index);
+		pr_cont("%1d   %1d    %1d    %1d   %1d   "
+			"%1d    %1d     %X    %02X\n",
+			ir_entry->format,
+			ir_entry->mask,
+			ir_entry->trigger,
+			ir_entry->irr,
+			ir_entry->polarity,
+			ir_entry->delivery_status,
+			ir_entry->index2,
+			ir_entry->zero,
+			ir_entry->vector);
+	}
+}
+
+__apicdebuginit(void) print_IO_APIC(int ioapic_idx)
+{
 	union IO_APIC_reg_00 reg_00;
 	union IO_APIC_reg_01 reg_01;
 	union IO_APIC_reg_02 reg_02;
@@ -1572,58 +1626,7 @@ __apicdebuginit(void) print_IO_APIC(int ioapic_idx)
 
 	printk(KERN_DEBUG ".... IRQ redirection table:\n");
 
-	if (irq_remapping_enabled) {
-		printk(KERN_DEBUG " NR Indx Fmt Mask Trig IRR"
-			" Pol Stat Indx2 Zero Vect:\n");
-	} else {
-		printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol"
-			" Stat Dmod Deli Vect:\n");
-	}
-
-	for (i = 0; i <= reg_01.bits.entries; i++) {
-		if (irq_remapping_enabled) {
-			struct IO_APIC_route_entry entry;
-			struct IR_IO_APIC_route_entry *ir_entry;
-
-			entry = ioapic_read_entry(ioapic_idx, i);
-			ir_entry = (struct IR_IO_APIC_route_entry *) &entry;
-			printk(KERN_DEBUG " %02x %04X ",
-				i,
-				ir_entry->index
-			);
-			pr_cont("%1d   %1d    %1d    %1d   %1d   "
-				"%1d    %1d     %X    %02X\n",
-				ir_entry->format,
-				ir_entry->mask,
-				ir_entry->trigger,
-				ir_entry->irr,
-				ir_entry->polarity,
-				ir_entry->delivery_status,
-				ir_entry->index2,
-				ir_entry->zero,
-				ir_entry->vector
-			);
-		} else {
-			struct IO_APIC_route_entry entry;
-
-			entry = ioapic_read_entry(ioapic_idx, i);
-			printk(KERN_DEBUG " %02x %02X  ",
-				i,
-				entry.dest
-			);
-			pr_cont("%1d    %1d    %1d   %1d   %1d    "
-				"%1d    %1d    %02X\n",
-				entry.mask,
-				entry.trigger,
-				entry.irr,
-				entry.polarity,
-				entry.delivery_status,
-				entry.dest_mode,
-				entry.delivery_mode,
-				entry.vector
-			);
-		}
-	}
+	x86_io_apic_ops.print_entries(ioapic_idx, reg_01.bits.entries);
 }
 
 __apicdebuginit(void) print_IO_APICs(void)
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index 3ea56c2..dc19c50 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -125,4 +125,5 @@ struct x86_io_apic_ops x86_io_apic_ops = {
 	.write			= native_io_apic_write,
 	.modify			= native_io_apic_modify,
 	.disable		= native_disable_io_apic,
+	.print_entries		= native_io_apic_print_entries,
 };
diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index e0b18f3..321db1a 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -617,6 +617,10 @@ static int __init intel_enable_irq_remapping(void)
 		goto error;
 
 	irq_remapping_enabled = 1;
+
+	/* VT-d needs a special routine to print IO-APIC entries */
+	x86_io_apic_ops.print_entries = intel_ir_io_apic_print_entries;
+
 	pr_info("Enabled IRQ remapping in %s mode\n", eim ? "x2apic" : "xapic");
 
 	return eim ? IRQ_REMAP_X2APIC_MODE : IRQ_REMAP_XAPIC_MODE;
-- 
1.7.9.5

[PATCH 05/19] x86, hpet: Introduce x86_msi_ops.setup_hpet_msi

[Joerg Roedel]

This function pointer can be overwritten by the IRQ
remapping code. The irq_remapping_enabled check can be
removed from default_setup_hpet_msi.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/hpet.h     |    4 ++--
 arch/x86/include/asm/x86_init.h |    1 +
 arch/x86/kernel/apic/io_apic.c  |    7 +------
 arch/x86/kernel/hpet.c          |    2 +-
 arch/x86/kernel/x86_init.c      |   10 ++++++----
 drivers/iommu/irq_remapping.c   |    3 ++-
 6 files changed, 13 insertions(+), 14 deletions(-)

diff --git a/arch/x86/include/asm/hpet.h b/arch/x86/include/asm/hpet.h
index 2c392d6..7642824 100644
--- a/arch/x86/include/asm/hpet.h
+++ b/arch/x86/include/asm/hpet.h
@@ -82,9 +82,9 @@ extern void hpet_msi_write(struct hpet_dev *hdev, struct msi_msg *msg);
 extern void hpet_msi_read(struct hpet_dev *hdev, struct msi_msg *msg);
 
 #ifdef CONFIG_PCI_MSI
-extern int arch_setup_hpet_msi(unsigned int irq, unsigned int id);
+extern int default_setup_hpet_msi(unsigned int irq, unsigned int id);
 #else
-static inline int arch_setup_hpet_msi(unsigned int irq, unsigned int id)
+static inline int default_setup_hpet_msi(unsigned int irq, unsigned int id)
 {
 	return -EINVAL;
 }
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index be8e9a6..1f49c8a 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -186,6 +186,7 @@ struct x86_msi_ops {
 	void (*teardown_msi_irq)(unsigned int irq);
 	void (*teardown_msi_irqs)(struct pci_dev *dev);
 	void (*restore_msi_irqs)(struct pci_dev *dev, int irq);
+	int  (*setup_hpet_msi)(unsigned int irq, unsigned int id);
 };
 
 struct x86_io_apic_ops {
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index c3a05e9..56a2427 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3297,17 +3297,12 @@ static struct irq_chip hpet_msi_type = {
 	.irq_retrigger = ioapic_retrigger_irq,
 };
 
-int arch_setup_hpet_msi(unsigned int irq, unsigned int id)
+int default_setup_hpet_msi(unsigned int irq, unsigned int id)
 {
 	struct irq_chip *chip = &hpet_msi_type;
 	struct msi_msg msg;
 	int ret;
 
-	if (irq_remapping_enabled) {
-		if (!setup_hpet_msi_remapped(irq, id))
-			return -1;
-	}
-
 	ret = msi_compose_msg(NULL, irq, &msg, id);
 	if (ret < 0)
 		return ret;
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 1460a5d..22d4fe5 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -478,7 +478,7 @@ static int hpet_msi_next_event(unsigned long delta,
 
 static int hpet_setup_msi_irq(unsigned int irq)
 {
-	if (arch_setup_hpet_msi(irq, hpet_blockid)) {
+	if (x86_msi.setup_hpet_msi(irq, hpet_blockid)) {
 		destroy_irq(irq);
 		return -EINVAL;
 	}
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index dc19c50..339e108 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -19,6 +19,7 @@
 #include <asm/time.h>
 #include <asm/irq.h>
 #include <asm/io_apic.h>
+#include <asm/hpet.h>
 #include <asm/pat.h>
 #include <asm/tsc.h>
 #include <asm/iommu.h>
@@ -113,10 +114,11 @@ struct x86_platform_ops x86_platform = {
 
 EXPORT_SYMBOL_GPL(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,
-	.restore_msi_irqs = default_restore_msi_irqs,
+	.setup_msi_irqs		= native_setup_msi_irqs,
+	.teardown_msi_irq	= native_teardown_msi_irq,
+	.teardown_msi_irqs	= default_teardown_msi_irqs,
+	.restore_msi_irqs	= default_restore_msi_irqs,
+	.setup_hpet_msi		= default_setup_hpet_msi,
 };
 
 struct x86_io_apic_ops x86_io_apic_ops = {
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index f72a5e8..f439151 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -36,7 +36,8 @@ static void irq_remapping_disable_io_apic(void)
 
 static void __init irq_remapping_modify_x86_ops(void)
 {
-	x86_io_apic_ops.disable	=	irq_remapping_disable_io_apic;
+	x86_io_apic_ops.disable		= irq_remapping_disable_io_apic;
+	x86_msi.setup_hpet_msi		= setup_hpet_msi_remapped;
 }
 
 static __init int setup_nointremap(char *str)
-- 
1.7.9.5

[PATCH 06/19] x86, msi: Use IRQ remapping specific setup_msi_irqs routine

[Joerg Roedel]

Use seperate routines to setup MSI IRQs for both
irq_remapping_enabled cases.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/irq_remapping.h |   12 -------
 arch/x86/include/asm/pci.h           |    2 ++
 arch/x86/kernel/apic/io_apic.c       |   26 ++--------------
 drivers/iommu/irq_remapping.c        |   57 ++++++++++++++++++++++++++++++++--
 4 files changed, 59 insertions(+), 38 deletions(-)

diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h
index 5fb9bbb..0ee1e88 100644
--- a/arch/x86/include/asm/irq_remapping.h
+++ b/arch/x86/include/asm/irq_remapping.h
@@ -47,9 +47,6 @@ extern void free_remapped_irq(int irq);
 extern void compose_remapped_msi_msg(struct pci_dev *pdev,
 				     unsigned int irq, unsigned int dest,
 				     struct msi_msg *msg, u8 hpet_id);
-extern int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec);
-extern int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
-				  int index, int sub_handle);
 extern int setup_hpet_msi_remapped(unsigned int irq, unsigned int id);
 
 #else  /* CONFIG_IRQ_REMAP */
@@ -83,15 +80,6 @@ static inline void compose_remapped_msi_msg(struct pci_dev *pdev,
 					    struct msi_msg *msg, u8 hpet_id)
 {
 }
-static inline int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
-{
-	return -ENODEV;
-}
-static inline int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
-					 int index, int sub_handle)
-{
-	return -ENODEV;
-}
 static inline int setup_hpet_msi_remapped(unsigned int irq, unsigned int id)
 {
 	return -ENODEV;
diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index df75d07..1470b53 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -121,9 +121,11 @@ static inline void x86_restore_msi_irqs(struct pci_dev *dev, int irq)
 #define arch_teardown_msi_irq x86_teardown_msi_irq
 #define arch_restore_msi_irqs x86_restore_msi_irqs
 /* implemented in arch/x86/kernel/apic/io_apic. */
+struct msi_desc;
 int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
 void native_teardown_msi_irq(unsigned int irq);
 void native_restore_msi_irqs(struct pci_dev *dev, int irq);
+int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int irq);
 /* default to the implementation in drivers/lib/msi.c */
 #define HAVE_DEFAULT_MSI_TEARDOWN_IRQS
 #define HAVE_DEFAULT_MSI_RESTORE_IRQS
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 56a2427..f5e85ae 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3135,7 +3135,7 @@ static struct irq_chip msi_chip = {
 	.irq_retrigger		= ioapic_retrigger_irq,
 };
 
-static int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int irq)
+int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int irq)
 {
 	struct irq_chip *chip = &msi_chip;
 	struct msi_msg msg;
@@ -3162,9 +3162,9 @@ static int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int irq)
 
 int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 {
-	int node, ret, sub_handle, index = 0;
 	unsigned int irq, irq_want;
 	struct msi_desc *msidesc;
+	int node, ret;
 
 	/* x86 doesn't support multiple MSI yet */
 	if (type == PCI_CAP_ID_MSI && nvec > 1)
@@ -3172,36 +3172,16 @@ int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 
 	node = dev_to_node(&dev->dev);
 	irq_want = nr_irqs_gsi;
-	sub_handle = 0;
 	list_for_each_entry(msidesc, &dev->msi_list, list) {
 		irq = create_irq_nr(irq_want, node);
 		if (irq == 0)
 			return -1;
+
 		irq_want = irq + 1;
-		if (!irq_remapping_enabled)
-			goto no_ir;
 
-		if (!sub_handle) {
-			/*
-			 * allocate the consecutive block of IRTE's
-			 * for 'nvec'
-			 */
-			index = msi_alloc_remapped_irq(dev, irq, nvec);
-			if (index < 0) {
-				ret = index;
-				goto error;
-			}
-		} else {
-			ret = msi_setup_remapped_irq(dev, irq, index,
-						     sub_handle);
-			if (ret < 0)
-				goto error;
-		}
-no_ir:
 		ret = setup_msi_irq(dev, msidesc, irq);
 		if (ret < 0)
 			goto error;
-		sub_handle++;
 	}
 	return 0;
 
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index f439151..984104b 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -4,6 +4,8 @@
 #include <linux/cpumask.h>
 #include <linux/errno.h>
 #include <linux/msi.h>
+#include <linux/irq.h>
+#include <linux/pci.h>
 
 #include <asm/hw_irq.h>
 #include <asm/irq_remapping.h>
@@ -21,6 +23,10 @@ int no_x2apic_optout;
 
 static struct irq_remap_ops *remap_ops;
 
+static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec);
+static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
+				  int index, int sub_handle);
+
 static void irq_remapping_disable_io_apic(void)
 {
 	/*
@@ -34,9 +40,54 @@ static void irq_remapping_disable_io_apic(void)
 		disconnect_bsp_APIC(0);
 }
 
+static int irq_remapping_setup_msi_irqs(struct pci_dev *dev,
+					int nvec, int type)
+{
+	int node, ret, sub_handle, index = 0;
+	struct msi_desc *msidesc;
+	unsigned int irq;
+
+	/* We don't support multiple MSI yet */
+	if (type == PCI_CAP_ID_MSI && nvec > 1)
+		return 1;
+
+	node		= dev_to_node(&dev->dev);
+	irq		= get_nr_irqs_gsi();
+	sub_handle	= 0;
+
+	list_for_each_entry(msidesc, &dev->msi_list, list) {
+
+		irq = create_irq_nr(irq, node);
+		if (irq == 0)
+			return -1;
+
+		if (sub_handle == 0)
+			ret = index = msi_alloc_remapped_irq(dev, irq, nvec);
+		else
+			ret = msi_setup_remapped_irq(dev, irq, index, sub_handle);
+
+		if (ret < 0)
+			goto error;
+
+		ret = setup_msi_irq(dev, msidesc, irq);
+		if (ret < 0)
+			goto error;
+
+		sub_handle += 1;
+		irq        += 1;
+	}
+
+	return 0;
+
+error:
+	destroy_irq(irq);
+	return ret;
+}
+
 static void __init irq_remapping_modify_x86_ops(void)
 {
 	x86_io_apic_ops.disable		= irq_remapping_disable_io_apic;
+	x86_msi.setup_msi_irqs		= irq_remapping_setup_msi_irqs;
 	x86_msi.setup_hpet_msi		= setup_hpet_msi_remapped;
 }
 
@@ -181,7 +232,7 @@ void compose_remapped_msi_msg(struct pci_dev *pdev,
 	remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
 }
 
-int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
+static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
 {
 	if (!remap_ops || !remap_ops->msi_alloc_irq)
 		return -ENODEV;
@@ -189,8 +240,8 @@ int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
 	return remap_ops->msi_alloc_irq(pdev, irq, nvec);
 }
 
-int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
-			   int index, int sub_handle)
+static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
+				  int index, int sub_handle)
 {
 	if (!remap_ops || !remap_ops->msi_setup_irq)
 		return -ENODEV;
-- 
1.7.9.5

[PATCH 07/19] x86, io_apic: Introduce set_affinity function pointer

[Joerg Roedel]

With interrupt remapping a special function is used to
change the affinity of an IO-APIC interrupt. Abstract this
with a function pointer.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/hw_irq.h        |    2 ++
 arch/x86/include/asm/irq_remapping.h |    9 ---------
 arch/x86/include/asm/x86_init.h      |    6 ++++++
 arch/x86/kernel/apic/io_apic.c       |   17 +++++++----------
 arch/x86/kernel/x86_init.c           |    1 +
 drivers/iommu/irq_remapping.c        |    4 ++++
 6 files changed, 20 insertions(+), 19 deletions(-)

diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index eb92a6e..669db90 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -130,6 +130,8 @@ extern void send_cleanup_vector(struct irq_cfg *);
 struct irq_data;
 int __ioapic_set_affinity(struct irq_data *, const struct cpumask *,
 			  unsigned int *dest_id);
+int native_ioapic_set_affinity(struct irq_data *, const struct cpumask *,
+			       bool);
 extern int IO_APIC_get_PCI_irq_vector(int bus, int devfn, int pin, struct io_apic_irq_attr *irq_attr);
 extern void setup_ioapic_dest(void);
 
diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h
index 0ee1e88..f1afa04 100644
--- a/arch/x86/include/asm/irq_remapping.h
+++ b/arch/x86/include/asm/irq_remapping.h
@@ -40,9 +40,6 @@ extern int setup_ioapic_remapped_entry(int irq,
 				       unsigned int destination,
 				       int vector,
 				       struct io_apic_irq_attr *attr);
-extern int set_remapped_irq_affinity(struct irq_data *data,
-				     const struct cpumask *mask,
-				     bool force);
 extern void free_remapped_irq(int irq);
 extern void compose_remapped_msi_msg(struct pci_dev *pdev,
 				     unsigned int irq, unsigned int dest,
@@ -68,12 +65,6 @@ static inline int setup_ioapic_remapped_entry(int irq,
 {
 	return -ENODEV;
 }
-static inline int set_remapped_irq_affinity(struct irq_data *data,
-					    const struct cpumask *mask,
-					    bool force)
-{
-	return 0;
-}
 static inline void free_remapped_irq(int irq) { }
 static inline void compose_remapped_msi_msg(struct pci_dev *pdev,
 					    unsigned int irq, unsigned int dest,
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index 1f49c8a..f5f712b 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -189,6 +189,9 @@ struct x86_msi_ops {
 	int  (*setup_hpet_msi)(unsigned int irq, unsigned int id);
 };
 
+struct irq_data;
+struct cpumask;
+
 struct x86_io_apic_ops {
 	void		(*init)   (void);
 	unsigned int	(*read)   (unsigned int apic, unsigned int reg);
@@ -196,6 +199,9 @@ struct x86_io_apic_ops {
 	void		(*modify) (unsigned int apic, unsigned int reg, unsigned int value);
 	void		(*disable)(void);
 	void		(*print_entries)(unsigned int apic, unsigned int nr_entries);
+	int		(*set_affinity)(struct irq_data *data,
+					const struct cpumask *mask,
+					bool force);
 };
 
 extern struct x86_init_ops x86_init;
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index f5e85ae..11e3a38 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2368,9 +2368,10 @@ int __ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
 	return 0;
 }
 
-static int
-ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
-		    bool force)
+
+int native_ioapic_set_affinity(struct irq_data *data,
+			       const struct cpumask *mask,
+			       bool force)
 {
 	unsigned int dest, irq = data->irq;
 	unsigned long flags;
@@ -2569,8 +2570,7 @@ static void irq_remap_modify_chip_defaults(struct irq_chip *chip)
 	chip->irq_print_chip = ir_print_prefix;
 	chip->irq_ack = ir_ack_apic_edge;
 	chip->irq_eoi = ir_ack_apic_level;
-
-	chip->irq_set_affinity = set_remapped_irq_affinity;
+	chip->irq_set_affinity = x86_io_apic_ops.set_affinity;
 }
 #endif /* CONFIG_IRQ_REMAP */
 
@@ -2581,7 +2581,7 @@ static struct irq_chip ioapic_chip __read_mostly = {
 	.irq_unmask		= unmask_ioapic_irq,
 	.irq_ack		= ack_apic_edge,
 	.irq_eoi		= ack_apic_level,
-	.irq_set_affinity	= ioapic_set_affinity,
+	.irq_set_affinity	= native_ioapic_set_affinity,
 	.irq_retrigger		= ioapic_retrigger_irq,
 };
 
@@ -3656,10 +3656,7 @@ void __init setup_ioapic_dest(void)
 		else
 			mask = apic->target_cpus();
 
-		if (irq_remapping_enabled)
-			set_remapped_irq_affinity(idata, mask, false);
-		else
-			ioapic_set_affinity(idata, mask, false);
+		x86_io_apic_ops.set_affinity(idata, mask, false);
 	}
 
 }
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index 339e108..8806d0b 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -128,4 +128,5 @@ struct x86_io_apic_ops x86_io_apic_ops = {
 	.modify			= native_io_apic_modify,
 	.disable		= native_disable_io_apic,
 	.print_entries		= native_io_apic_print_entries,
+	.set_affinity		= native_ioapic_set_affinity,
 };
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 984104b..ccf87e5 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -26,6 +26,9 @@ static struct irq_remap_ops *remap_ops;
 static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec);
 static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
 				  int index, int sub_handle);
+static int set_remapped_irq_affinity(struct irq_data *data,
+				     const struct cpumask *mask,
+				     bool force);
 
 static void irq_remapping_disable_io_apic(void)
 {
@@ -87,6 +90,7 @@ error:
 static void __init irq_remapping_modify_x86_ops(void)
 {
 	x86_io_apic_ops.disable		= irq_remapping_disable_io_apic;
+	x86_io_apic_ops.set_affinity	= set_remapped_irq_affinity;
 	x86_msi.setup_msi_irqs		= irq_remapping_setup_msi_irqs;
 	x86_msi.setup_hpet_msi		= setup_hpet_msi_remapped;
 }
-- 
1.7.9.5

[PATCH 08/19] x86, io_apic: Convert setup_ioapic_entry to function pointer

[Joerg Roedel]

This pointer is changed to a different function when IRQ
remapping is enabled.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/io_apic.h  |    4 ++++
 arch/x86/include/asm/x86_init.h |    5 +++++
 arch/x86/kernel/apic/io_apic.c  |   14 +++++---------
 arch/x86/kernel/x86_init.c      |    1 +
 drivers/iommu/irq_remapping.c   |    1 +
 5 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 32ce9d2..2cefc56 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -149,6 +149,10 @@ extern int io_apic_set_pci_routing(struct device *dev, int irq,
 void setup_IO_APIC_irq_extra(u32 gsi);
 extern void ioapic_insert_resources(void);
 
+extern int native_setup_ioapic_entry(int, struct IO_APIC_route_entry *,
+				     unsigned int, int,
+				     struct io_apic_irq_attr *);
+
 int io_apic_setup_irq_pin_once(unsigned int irq, int node, struct io_apic_irq_attr *attr);
 
 extern int save_ioapic_entries(void);
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index f5f712b..bc13022 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -189,6 +189,8 @@ struct x86_msi_ops {
 	int  (*setup_hpet_msi)(unsigned int irq, unsigned int id);
 };
 
+struct IO_APIC_route_entry;
+struct io_apic_irq_attr;
 struct irq_data;
 struct cpumask;
 
@@ -202,6 +204,9 @@ struct x86_io_apic_ops {
 	int		(*set_affinity)(struct irq_data *data,
 					const struct cpumask *mask,
 					bool force);
+	int		(*setup_entry)(int irq, struct IO_APIC_route_entry *entry,
+				       unsigned int destination, int vector,
+				       struct io_apic_irq_attr *attr);
 };
 
 extern struct x86_init_ops x86_init;
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 11e3a38..44e1cb0 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1319,14 +1319,10 @@ static void ioapic_register_intr(unsigned int irq, struct irq_cfg *cfg,
 				      fasteoi ? "fasteoi" : "edge");
 }
 
-static int setup_ioapic_entry(int irq, struct IO_APIC_route_entry *entry,
-			       unsigned int destination, int vector,
-			       struct io_apic_irq_attr *attr)
+int native_setup_ioapic_entry(int irq, struct IO_APIC_route_entry *entry,
+			      unsigned int destination, int vector,
+			      struct io_apic_irq_attr *attr)
 {
-	if (irq_remapping_enabled)
-		return setup_ioapic_remapped_entry(irq, entry, destination,
-						   vector, attr);
-
 	memset(entry, 0, sizeof(*entry));
 
 	entry->delivery_mode = apic->irq_delivery_mode;
@@ -1374,8 +1370,8 @@ static void setup_ioapic_irq(unsigned int irq, struct irq_cfg *cfg,
 		    attr->ioapic, mpc_ioapic_id(attr->ioapic), attr->ioapic_pin,
 		    cfg->vector, irq, attr->trigger, attr->polarity, dest);
 
-	if (setup_ioapic_entry(irq, &entry, dest, cfg->vector, attr)) {
-		pr_warn("Failed to setup ioapic entry for ioapic %d, pin %d\n",
+	if (x86_io_apic_ops.setup_entry(irq, &entry, dest, cfg->vector, attr)) {
+		pr_warn("Failed to setup ioapic entry for ioapic  %d, pin %d\n",
 			mpc_ioapic_id(attr->ioapic), attr->ioapic_pin);
 		__clear_irq_vector(irq, cfg);
 
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index 8806d0b..3cd6bf7 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -129,4 +129,5 @@ struct x86_io_apic_ops x86_io_apic_ops = {
 	.disable		= native_disable_io_apic,
 	.print_entries		= native_io_apic_print_entries,
 	.set_affinity		= native_ioapic_set_affinity,
+	.setup_entry		= native_setup_ioapic_entry,
 };
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index ccf87e5..5b28e28 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -91,6 +91,7 @@ static void __init irq_remapping_modify_x86_ops(void)
 {
 	x86_io_apic_ops.disable		= irq_remapping_disable_io_apic;
 	x86_io_apic_ops.set_affinity	= set_remapped_irq_affinity;
+	x86_io_apic_ops.setup_entry	= setup_ioapic_remapped_entry;
 	x86_msi.setup_msi_irqs		= irq_remapping_setup_msi_irqs;
 	x86_msi.setup_hpet_msi		= setup_hpet_msi_remapped;
 }
-- 
1.7.9.5

[PATCH 09/19] x86, io_apic: Move irq_remapping_enabled checks out of check_timer()

[Joerg Roedel]

Move these checks to IRQ remapping code by introducing the
panic_on_irq_remap() function.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/irq_remapping.h |    5 +++++
 arch/x86/kernel/apic/io_apic.c       |    6 ++----
 drivers/iommu/irq_remapping.c        |    6 ++++++
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h
index f1afa04..fb99a73 100644
--- a/arch/x86/include/asm/irq_remapping.h
+++ b/arch/x86/include/asm/irq_remapping.h
@@ -45,6 +45,7 @@ extern void compose_remapped_msi_msg(struct pci_dev *pdev,
 				     unsigned int irq, unsigned int dest,
 				     struct msi_msg *msg, u8 hpet_id);
 extern int setup_hpet_msi_remapped(unsigned int irq, unsigned int id);
+extern void panic_if_irq_remap(const char *msg);
 
 #else  /* CONFIG_IRQ_REMAP */
 
@@ -75,6 +76,10 @@ static inline int setup_hpet_msi_remapped(unsigned int irq, unsigned int id)
 {
 	return -ENODEV;
 }
+
+static inline void panic_if_irq_remap(const char *msg)
+{
+}
 #endif /* CONFIG_IRQ_REMAP */
 
 #endif /* __X86_IRQ_REMAPPING_H */
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 44e1cb0..5e12614 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2776,8 +2776,7 @@ static inline void __init check_timer(void)
 	 * 8259A.
 	 */
 	if (pin1 == -1) {
-		if (irq_remapping_enabled)
-			panic("BIOS bug: timer not connected to IO-APIC");
+		panic_if_irq_remap("BIOS bug: timer not connected to IO-APIC");
 		pin1 = pin2;
 		apic1 = apic2;
 		no_pin1 = 1;
@@ -2809,8 +2808,7 @@ static inline void __init check_timer(void)
 				clear_IO_APIC_pin(0, pin1);
 			goto out;
 		}
-		if (irq_remapping_enabled)
-			panic("timer doesn't work through Interrupt-remapped IO-APIC");
+		panic_if_irq_remap("timer doesn't work through Interrupt-remapped IO-APIC");
 		local_irq_disable();
 		clear_IO_APIC_pin(apic1, pin1);
 		if (!no_pin1)
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 5b28e28..827f8a1 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -261,3 +261,9 @@ int setup_hpet_msi_remapped(unsigned int irq, unsigned int id)
 
 	return remap_ops->setup_hpet_msi(irq, id);
 }
+
+void panic_if_irq_remap(const char *msg)
+{
+	if (irq_remapping_enabled)
+		panic(msg);
+}
-- 
1.7.9.5

[PATCH 10/19] x86, io_apic: Introduce function pointer for setup_timer_IRQ0_pin

[Joerg Roedel]

This function must be a NOP with interrupt remapping
enabled. So use a funtion pointer for it which points to an
empty function when irq_remapping_enabled == true.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/io_apic.h  |    5 +++++
 arch/x86/include/asm/x86_init.h |    3 +++
 arch/x86/kernel/apic/io_apic.c  |   11 ++++-------
 arch/x86/kernel/x86_init.c      |    1 +
 drivers/iommu/irq_remapping.c   |    7 +++++++
 5 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 2cefc56..d74d5f4 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -152,6 +152,11 @@ extern void ioapic_insert_resources(void);
 extern int native_setup_ioapic_entry(int, struct IO_APIC_route_entry *,
 				     unsigned int, int,
 				     struct io_apic_irq_attr *);
+extern int native_setup_ioapic_entry(int, struct IO_APIC_route_entry *,
+				     unsigned int, int,
+				     struct io_apic_irq_attr *);
+extern void __init native_setup_timer_pin(unsigned int ioapic_idx,
+					  unsigned int pin, int vector);
 
 int io_apic_setup_irq_pin_once(unsigned int irq, int node, struct io_apic_irq_attr *attr);
 
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index bc13022..ffe5860 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -207,6 +207,9 @@ struct x86_io_apic_ops {
 	int		(*setup_entry)(int irq, struct IO_APIC_route_entry *entry,
 				       unsigned int destination, int vector,
 				       struct io_apic_irq_attr *attr);
+	void		(*setup_timer_pin)(unsigned int ioapic_idx,
+					   unsigned int pin, int vector);
+
 };
 
 extern struct x86_init_ops x86_init;
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 5e12614..d17ae46 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1473,15 +1473,12 @@ void setup_IO_APIC_irq_extra(u32 gsi)
 /*
  * Set up the timer pin, possibly with the 8259A-master behind.
  */
-static void __init setup_timer_IRQ0_pin(unsigned int ioapic_idx,
-					unsigned int pin, int vector)
+void __init native_setup_timer_pin(unsigned int ioapic_idx,
+				   unsigned int pin, int vector)
 {
 	struct IO_APIC_route_entry entry;
 	unsigned int dest;
 
-	if (irq_remapping_enabled)
-		return;
-
 	memset(&entry, 0, sizeof(entry));
 
 	/*
@@ -2791,7 +2788,7 @@ static inline void __init check_timer(void)
 		 */
 		if (no_pin1) {
 			add_pin_to_irq_node(cfg, node, apic1, pin1);
-			setup_timer_IRQ0_pin(apic1, pin1, cfg->vector);
+			x86_io_apic_ops.setup_timer_pin(apic1, pin1, cfg->vector);
 		} else {
 			/* for edge trigger, setup_ioapic_irq already
 			 * leave it unmasked.
@@ -2823,7 +2820,7 @@ static inline void __init check_timer(void)
 		 * legacy devices should be connected to IO APIC #0
 		 */
 		replace_pin_at_irq_node(cfg, node, apic1, pin1, apic2, pin2);
-		setup_timer_IRQ0_pin(apic2, pin2, cfg->vector);
+		x86_io_apic_ops.setup_timer_pin(apic2, pin2, cfg->vector);
 		legacy_pic->unmask(0);
 		if (timer_irq_works()) {
 			apic_printk(APIC_QUIET, KERN_INFO "....... works.\n");
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index 3cd6bf7..eba02e5 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -130,4 +130,5 @@ struct x86_io_apic_ops x86_io_apic_ops = {
 	.print_entries		= native_io_apic_print_entries,
 	.set_affinity		= native_ioapic_set_affinity,
 	.setup_entry		= native_setup_ioapic_entry,
+	.setup_timer_pin	= native_setup_timer_pin,
 };
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 827f8a1..71824fc 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -87,11 +87,18 @@ error:
 	return ret;
 }
 
+static void __init irq_remapping_setup_timer_pin(unsigned int ioapic_idx,
+						 unsigned int pin, int vector)
+{
+	/* Not needed with interrupt remapping */
+}
+
 static void __init irq_remapping_modify_x86_ops(void)
 {
 	x86_io_apic_ops.disable		= irq_remapping_disable_io_apic;
 	x86_io_apic_ops.set_affinity	= set_remapped_irq_affinity;
 	x86_io_apic_ops.setup_entry	= setup_ioapic_remapped_entry;
+	x86_io_apic_ops.setup_timer_pin	= irq_remapping_setup_timer_pin;
 	x86_msi.setup_msi_irqs		= irq_remapping_setup_msi_irqs;
 	x86_msi.setup_hpet_msi		= setup_hpet_msi_remapped;
 }
-- 
1.7.9.5

[PATCH 11/19] x86, irq: Move irq_remapping_enabled declaration to iommu code

[Joerg Roedel]

Remove the last left-over from this flag from x86 code.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/irq_remapping.h |    4 ----
 drivers/iommu/dmar.c                 |    2 ++
 drivers/iommu/intel-iommu.c          |    2 ++
 drivers/iommu/irq_remapping.h        |    3 +++
 4 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h
index fb99a73..6f4b48b 100644
--- a/arch/x86/include/asm/irq_remapping.h
+++ b/arch/x86/include/asm/irq_remapping.h
@@ -26,8 +26,6 @@
 
 #ifdef CONFIG_IRQ_REMAP
 
-extern int irq_remapping_enabled;
-
 extern void setup_irq_remapping_ops(void);
 extern int irq_remapping_supported(void);
 extern int irq_remapping_prepare(void);
@@ -49,8 +47,6 @@ extern void panic_if_irq_remap(const char *msg);
 
 #else  /* CONFIG_IRQ_REMAP */
 
-#define irq_remapping_enabled	0
-
 static inline void setup_irq_remapping_ops(void) { }
 static inline int irq_remapping_supported(void) { return 0; }
 static inline int irq_remapping_prepare(void) { return -ENODEV; }
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 86e2f4a..174bb65 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -41,6 +41,8 @@
 #include <asm/irq_remapping.h>
 #include <asm/iommu_table.h>
 
+#include "irq_remapping.h"
+
 /* No locks are needed as DMA remapping hardware unit
  * list is constructed at boot time and hotplug of
  * these units are not supported by the architecture.
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 7469b53..28c944c 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -46,6 +46,8 @@
 #include <asm/cacheflush.h>
 #include <asm/iommu.h>
 
+#include "irq_remapping.h"
+
 #define ROOT_SIZE		VTD_PAGE_SIZE
 #define CONTEXT_SIZE		VTD_PAGE_SIZE
 
diff --git a/drivers/iommu/irq_remapping.h b/drivers/iommu/irq_remapping.h
index b12974c..1003297 100644
--- a/drivers/iommu/irq_remapping.h
+++ b/drivers/iommu/irq_remapping.h
@@ -34,6 +34,7 @@ struct msi_msg;
 extern int disable_irq_remap;
 extern int disable_sourceid_checking;
 extern int no_x2apic_optout;
+extern int irq_remapping_enabled;
 
 struct irq_remap_ops {
 	/* Check whether Interrupt Remapping is supported */
@@ -83,6 +84,8 @@ struct irq_remap_ops {
 
 extern struct irq_remap_ops intel_irq_remap_ops;
 
+#else  /* CONFIG_IRQ_REMAP */
+#define irq_remapping_enabled 0
 #endif /* CONFIG_IRQ_REMAP */
 
 #endif /* __IRQ_REMAPPING_H */
-- 
1.7.9.5

[PATCH 12/19] x86, irq: Add data structure to keep AMD specific irq remapping information

[Joerg Roedel]

Add a data structure to store information the IOMMU driver
can use to get from a 'struct irq_cfg' to the remapping
entry.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/hw_irq.h |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index 669db90..465c855 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -101,6 +101,7 @@ static inline void set_io_apic_irq_attr(struct io_apic_irq_attr *irq_attr,
 	irq_attr->polarity	= polarity;
 }
 
+/* Intel specific interrupt remapping information */
 struct irq_2_iommu {
 	struct intel_iommu *iommu;
 	u16 irte_index;
@@ -108,6 +109,12 @@ struct irq_2_iommu {
 	u8  irte_mask;
 };
 
+/* AMD specific interrupt remapping information */
+struct irq_2_irte {
+	u16 devid; /* Device ID for IRTE table */
+	u16 index; /* Index into IRTE table*/
+};
+
 /*
  * This is performance-critical, we want to do it O(1)
  *
@@ -120,7 +127,10 @@ struct irq_cfg {
 	u8			vector;
 	u8			move_in_progress : 1;
 #ifdef CONFIG_IRQ_REMAP
-	struct irq_2_iommu	irq_2_iommu;
+	union {
+		struct irq_2_iommu irq_2_iommu;
+		struct irq_2_irte  irq_2_irte;
+	};
 #endif
 };
 
-- 
1.7.9.5

[PATCH 13/19] x86, io-apic: Move CONFIG_IRQ_REMAP code out of x86 core

[Joerg Roedel]

Move all the code to either to the header file
asm/irq_remapping.h or to drivers/iommu/.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/hw_irq.h        |    1 +
 arch/x86/include/asm/io_apic.h       |    2 ++
 arch/x86/include/asm/irq_remapping.h |   17 +++++++++++++
 arch/x86/kernel/apic/io_apic.c       |   44 +---------------------------------
 drivers/iommu/intel_irq_remapping.c  |    4 ++++
 drivers/iommu/irq_remapping.c        |   25 +++++++++++++++++++
 6 files changed, 50 insertions(+), 43 deletions(-)

diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index 465c855..58c31f1 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -127,6 +127,7 @@ struct irq_cfg {
 	u8			vector;
 	u8			move_in_progress : 1;
 #ifdef CONFIG_IRQ_REMAP
+	bool			remapped;
 	union {
 		struct irq_2_iommu irq_2_iommu;
 		struct irq_2_irte  irq_2_irte;
diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index d74d5f4..f294eba 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -144,6 +144,7 @@ extern int timer_through_8259;
 	(mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
 
 struct io_apic_irq_attr;
+struct irq_cfg;
 extern int io_apic_set_pci_routing(struct device *dev, int irq,
 		 struct io_apic_irq_attr *irq_attr);
 void setup_IO_APIC_irq_extra(u32 gsi);
@@ -157,6 +158,7 @@ extern int native_setup_ioapic_entry(int, struct IO_APIC_route_entry *,
 				     struct io_apic_irq_attr *);
 extern void __init native_setup_timer_pin(unsigned int ioapic_idx,
 					  unsigned int pin, int vector);
+extern void eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg);
 
 int io_apic_setup_irq_pin_once(unsigned int irq, int node, struct io_apic_irq_attr *attr);
 
diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h
index 6f4b48b..1888148 100644
--- a/arch/x86/include/asm/irq_remapping.h
+++ b/arch/x86/include/asm/irq_remapping.h
@@ -45,6 +45,13 @@ extern void compose_remapped_msi_msg(struct pci_dev *pdev,
 extern int setup_hpet_msi_remapped(unsigned int irq, unsigned int id);
 extern void panic_if_irq_remap(const char *msg);
 
+static inline bool irq_remapped(struct irq_cfg *cfg)
+{
+	return cfg->remapped;
+}
+
+void irq_remap_modify_chip_defaults(struct irq_chip *chip);
+
 #else  /* CONFIG_IRQ_REMAP */
 
 static inline void setup_irq_remapping_ops(void) { }
@@ -76,6 +83,16 @@ static inline int setup_hpet_msi_remapped(unsigned int irq, unsigned int id)
 static inline void panic_if_irq_remap(const char *msg)
 {
 }
+
+static inline bool irq_remapped(struct irq_cfg *cfg)
+{
+	return false;
+}
+
+static inline void irq_remap_modify_chip_defaults(struct irq_chip *chip)
+{
+}
+
 #endif /* CONFIG_IRQ_REMAP */
 
 #endif /* __X86_IRQ_REMAPPING_H */
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index d17ae46..9664919 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -68,22 +68,6 @@
 #define for_each_irq_pin(entry, head) \
 	for (entry = head; entry; entry = entry->next)
 
-#ifdef CONFIG_IRQ_REMAP
-static void irq_remap_modify_chip_defaults(struct irq_chip *chip);
-static inline bool irq_remapped(struct irq_cfg *cfg)
-{
-	return cfg->irq_2_iommu.iommu != NULL;
-}
-#else
-static inline bool irq_remapped(struct irq_cfg *cfg)
-{
-	return false;
-}
-static inline void irq_remap_modify_chip_defaults(struct irq_chip *chip)
-{
-}
-#endif
-
 /*
  *      Is the SiS APIC rmw bug present ?
  *      -1 = don't know, 0 = no, 1 = yes
@@ -606,7 +590,7 @@ static void __eoi_ioapic_pin(int apic, int pin, int vector, struct irq_cfg *cfg)
 	}
 }
 
-static void eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg)
+void eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg)
 {
 	struct irq_pin_list *entry;
 	unsigned long flags;
@@ -2541,32 +2525,6 @@ static void ack_apic_level(struct irq_data *data)
 	ioapic_irqd_unmask(data, cfg, masked);
 }
 
-#ifdef CONFIG_IRQ_REMAP
-static void ir_ack_apic_edge(struct irq_data *data)
-{
-	ack_APIC_irq();
-}
-
-static void ir_ack_apic_level(struct irq_data *data)
-{
-	ack_APIC_irq();
-	eoi_ioapic_irq(data->irq, data->chip_data);
-}
-
-static void ir_print_prefix(struct irq_data *data, struct seq_file *p)
-{
-	seq_printf(p, " IR-%s", data->chip->name);
-}
-
-static void irq_remap_modify_chip_defaults(struct irq_chip *chip)
-{
-	chip->irq_print_chip = ir_print_prefix;
-	chip->irq_ack = ir_ack_apic_edge;
-	chip->irq_eoi = ir_ack_apic_level;
-	chip->irq_set_affinity = x86_io_apic_ops.set_affinity;
-}
-#endif /* CONFIG_IRQ_REMAP */
-
 static struct irq_chip ioapic_chip __read_mostly = {
 	.name			= "IO-APIC",
 	.irq_startup		= startup_ioapic_irq,
diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index 321db1a..5299f5b 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -68,6 +68,7 @@ static int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
 {
 	struct ir_table *table = iommu->ir_table;
 	struct irq_2_iommu *irq_iommu = irq_2_iommu(irq);
+	struct irq_cfg *cfg = irq_get_chip_data(irq);
 	u16 index, start_index;
 	unsigned int mask = 0;
 	unsigned long flags;
@@ -115,6 +116,7 @@ static int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
 	for (i = index; i < index + count; i++)
 		table->base[i].present = 1;
 
+	cfg->remapped = true;
 	irq_iommu->iommu = iommu;
 	irq_iommu->irte_index =  index;
 	irq_iommu->sub_handle = 0;
@@ -155,6 +157,7 @@ static int map_irq_to_irte_handle(int irq, u16 *sub_handle)
 static int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index, u16 subhandle)
 {
 	struct irq_2_iommu *irq_iommu = irq_2_iommu(irq);
+	struct irq_cfg *cfg = irq_get_chip_data(irq);
 	unsigned long flags;
 
 	if (!irq_iommu)
@@ -162,6 +165,7 @@ static int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index, u16 subha
 
 	raw_spin_lock_irqsave(&irq_2_ir_lock, flags);
 
+	cfg->remapped = true;
 	irq_iommu->iommu = iommu;
 	irq_iommu->irte_index = index;
 	irq_iommu->sub_handle = subhandle;
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 71824fc..3957fb2 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -1,3 +1,4 @@
+#include <linux/seq_file.h>
 #include <linux/cpumask.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
@@ -274,3 +275,27 @@ void panic_if_irq_remap(const char *msg)
 	if (irq_remapping_enabled)
 		panic(msg);
 }
+
+static void ir_ack_apic_edge(struct irq_data *data)
+{
+	ack_APIC_irq();
+}
+
+static void ir_ack_apic_level(struct irq_data *data)
+{
+	ack_APIC_irq();
+	eoi_ioapic_irq(data->irq, data->chip_data);
+}
+
+static void ir_print_prefix(struct irq_data *data, struct seq_file *p)
+{
+	seq_printf(p, " IR-%s", data->chip->name);
+}
+
+void irq_remap_modify_chip_defaults(struct irq_chip *chip)
+{
+	chip->irq_print_chip = ir_print_prefix;
+	chip->irq_ack = ir_ack_apic_edge;
+	chip->irq_eoi = ir_ack_apic_level;
+	chip->irq_set_affinity = x86_io_apic_ops.set_affinity;
+}
-- 
1.7.9.5

[PATCH 14/19] x86, io-apic: Remove !irq_remapped() check from __target_IO_APIC_irq()

[Joerg Roedel]

This function is only called from default_ioapic_set_affinity()
which is only used when interrupt remapping is disabled. So
the check will always evaluate as true and can be removed.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/kernel/apic/io_apic.c |    8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 9664919..32faf20 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2298,12 +2298,8 @@ static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, struct irq
 
 		apic = entry->apic;
 		pin = entry->pin;
-		/*
-		 * With interrupt-remapping, destination information comes
-		 * from interrupt-remapping table entry.
-		 */
-		if (!irq_remapped(cfg))
-			io_apic_write(apic, 0x11 + pin*2, dest);
+
+		io_apic_write(apic, 0x11 + pin*2, dest);
 		reg = io_apic_read(apic, 0x10 + pin*2);
 		reg &= ~IO_APIC_REDIR_VECTOR_MASK;
 		reg |= vector;
-- 
1.7.9.5

[PATCH 15/19] x86, irq: Move irq_remapped() check into free_remapped_irq

[Joerg Roedel]

The function is called unconditionally now in IO-APIC code
removing another irq_remapped() check from x86 core code.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/kernel/apic/io_apic.c |    4 ++--
 drivers/iommu/irq_remapping.c  |    5 ++++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 32faf20..6a7c6c9 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2981,8 +2981,8 @@ void destroy_irq(unsigned int irq)
 
 	irq_set_status_flags(irq, IRQ_NOREQUEST|IRQ_NOPROBE);
 
-	if (irq_remapped(cfg))
-		free_remapped_irq(irq);
+	free_remapped_irq(irq);
+
 	raw_spin_lock_irqsave(&vector_lock, flags);
 	__clear_irq_vector(irq, cfg);
 	raw_spin_unlock_irqrestore(&vector_lock, flags);
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 3957fb2..f2affc7 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -229,10 +229,13 @@ int set_remapped_irq_affinity(struct irq_data *data, const struct cpumask *mask,
 
 void free_remapped_irq(int irq)
 {
+	struct irq_cfg *cfg = irq_get_chip_data(irq);
+
 	if (!remap_ops || !remap_ops->free_irq)
 		return;
 
-	remap_ops->free_irq(irq);
+	if (cfg && irq_remapped(cfg))
+		remap_ops->free_irq(irq);
 }
 
 void compose_remapped_msi_msg(struct pci_dev *pdev,
-- 
1.7.9.5

[PATCH 16/19] x86, irq: Introduce setup_remapped_irq()

[Joerg Roedel]

This function does irq-remapping specific interrupt setup
like modifying the chip defaults.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/irq_remapping.h |    9 +++++++++
 arch/x86/kernel/apic/io_apic.c       |   13 +++----------
 drivers/iommu/irq_remapping.c        |   11 +++++++++++
 3 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h
index 1888148..b670580 100644
--- a/arch/x86/include/asm/irq_remapping.h
+++ b/arch/x86/include/asm/irq_remapping.h
@@ -44,6 +44,9 @@ extern void compose_remapped_msi_msg(struct pci_dev *pdev,
 				     struct msi_msg *msg, u8 hpet_id);
 extern int setup_hpet_msi_remapped(unsigned int irq, unsigned int id);
 extern void panic_if_irq_remap(const char *msg);
+extern bool setup_remapped_irq(int irq,
+			       struct irq_cfg *cfg,
+			       struct irq_chip *chip);
 
 static inline bool irq_remapped(struct irq_cfg *cfg)
 {
@@ -93,6 +96,12 @@ static inline void irq_remap_modify_chip_defaults(struct irq_chip *chip)
 {
 }
 
+static inline bool setup_remapped_irq(int irq,
+				      struct irq_cfg *cfg,
+				      struct irq_chip *chip)
+{
+	return false;
+}
 #endif /* CONFIG_IRQ_REMAP */
 
 #endif /* __X86_IRQ_REMAPPING_H */
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 6a7c6c9..ec37ec2 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1292,11 +1292,8 @@ static void ioapic_register_intr(unsigned int irq, struct irq_cfg *cfg,
 		fasteoi = false;
 	}
 
-	if (irq_remapped(cfg)) {
-		irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
-		irq_remap_modify_chip_defaults(chip);
+	if (setup_remapped_irq(irq, cfg, chip))
 		fasteoi = trigger != 0;
-	}
 
 	hdl = fasteoi ? handle_fasteoi_irq : handle_edge_irq;
 	irq_set_chip_and_handler_name(irq, chip, hdl,
@@ -3093,10 +3090,7 @@ int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int irq)
 	irq_set_msi_desc(irq, msidesc);
 	write_msi_msg(irq, &msg);
 
-	if (irq_remapped(irq_get_chip_data(irq))) {
-		irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
-		irq_remap_modify_chip_defaults(chip);
-	}
+	setup_remapped_irq(irq, irq_get_chip_data(irq), chip);
 
 	irq_set_chip_and_handler_name(irq, chip, handle_edge_irq, "edge");
 
@@ -3234,8 +3228,7 @@ int default_setup_hpet_msi(unsigned int irq, unsigned int id)
 
 	hpet_msi_write(irq_get_handler_data(irq), &msg);
 	irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
-	if (irq_remapped(irq_get_chip_data(irq)))
-		irq_remap_modify_chip_defaults(chip);
+	setup_remapped_irq(irq, irq_get_chip_data(irq), chip);
 
 	irq_set_chip_and_handler_name(irq, chip, handle_edge_irq, "edge");
 	return 0;
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index f2affc7..d9cd920f 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -302,3 +302,14 @@ void irq_remap_modify_chip_defaults(struct irq_chip *chip)
 	chip->irq_eoi = ir_ack_apic_level;
 	chip->irq_set_affinity = x86_io_apic_ops.set_affinity;
 }
+
+bool setup_remapped_irq(int irq, struct irq_cfg *cfg, struct irq_chip *chip)
+{
+	if (irq_remapped(cfg)) {
+		irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
+		irq_remap_modify_chip_defaults(chip);
+		return true;
+	} else {
+		return false;
+	}
+}
-- 
1.7.9.5

[PATCH 17/19] x86, msi: Introduce x86_msi.compose_msi_msg call-back

[Joerg Roedel]

This call-back points to the right function for initializing
the msi_msg structure.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/io_apic.h  |    3 +++
 arch/x86/include/asm/x86_init.h |    4 +++
 arch/x86/kernel/apic/io_apic.c  |   57 ++++++++++++++++++++-------------------
 arch/x86/kernel/x86_init.c      |    1 +
 drivers/iommu/irq_remapping.c   |    9 ++++---
 5 files changed, 44 insertions(+), 30 deletions(-)

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index f294eba..5ffa634 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -160,6 +160,9 @@ extern void __init native_setup_timer_pin(unsigned int ioapic_idx,
 					  unsigned int pin, int vector);
 extern void eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg);
 
+extern void native_compose_msi_msg(struct pci_dev *pdev,
+				   unsigned int irq, unsigned int dest,
+				   struct msi_msg *msg, u8 hpet_id);
 int io_apic_setup_irq_pin_once(unsigned int irq, int node, struct io_apic_irq_attr *attr);
 
 extern int save_ioapic_entries(void);
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index ffe5860..1430af0 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -180,9 +180,13 @@ struct x86_platform_ops {
 };
 
 struct pci_dev;
+struct msi_msg;
 
 struct x86_msi_ops {
 	int (*setup_msi_irqs)(struct pci_dev *dev, int nvec, int type);
+	void (*compose_msi_msg)(struct pci_dev *dev, unsigned int irq,
+				unsigned int dest, struct msi_msg *msg,
+			       u8 hpet_id);
 	void (*teardown_msi_irq)(unsigned int irq);
 	void (*teardown_msi_irqs)(struct pci_dev *dev);
 	void (*restore_msi_irqs)(struct pci_dev *dev, int irq);
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index ec37ec2..94e2f9d 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2990,36 +2990,16 @@ void destroy_irq(unsigned int irq)
  * MSI message composition
  */
 #ifdef CONFIG_PCI_MSI
-static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
-			   struct msi_msg *msg, u8 hpet_id)
+void native_compose_msi_msg(struct pci_dev *pdev,
+			    unsigned int irq, unsigned int dest,
+			    struct msi_msg *msg, u8 hpet_id)
 {
-	struct irq_cfg *cfg;
-	int err;
-	unsigned dest;
-
-	if (disable_apic)
-		return -ENXIO;
+	struct irq_cfg *cfg = irq_cfg(irq);
 
-	cfg = irq_cfg(irq);
-	err = assign_irq_vector(irq, cfg, apic->target_cpus());
-	if (err)
-		return err;
-
-	err = apic->cpu_mask_to_apicid_and(cfg->domain,
-					   apic->target_cpus(), &dest);
-	if (err)
-		return err;
-
-	if (irq_remapped(cfg)) {
-		compose_remapped_msi_msg(pdev, irq, dest, msg, hpet_id);
-		return err;
-	}
+	msg->address_hi = MSI_ADDR_BASE_HI;
 
 	if (x2apic_enabled())
-		msg->address_hi = MSI_ADDR_BASE_HI |
-				  MSI_ADDR_EXT_DEST_ID(dest);
-	else
-		msg->address_hi = MSI_ADDR_BASE_HI;
+		msg->address_hi |= MSI_ADDR_EXT_DEST_ID(dest);
 
 	msg->address_lo =
 		MSI_ADDR_BASE_LO |
@@ -3038,8 +3018,31 @@ static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
 			MSI_DATA_DELIVERY_FIXED:
 			MSI_DATA_DELIVERY_LOWPRI) |
 		MSI_DATA_VECTOR(cfg->vector);
+}
 
-	return err;
+static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
+			   struct msi_msg *msg, u8 hpet_id)
+{
+	struct irq_cfg *cfg;
+	int err;
+	unsigned dest;
+
+	if (disable_apic)
+		return -ENXIO;
+
+	cfg = irq_cfg(irq);
+	err = assign_irq_vector(irq, cfg, apic->target_cpus());
+	if (err)
+		return err;
+
+	err = apic->cpu_mask_to_apicid_and(cfg->domain,
+					   apic->target_cpus(), &dest);
+	if (err)
+		return err;
+
+	x86_msi.compose_msi_msg(pdev, irq, dest, msg, hpet_id);
+
+	return 0;
 }
 
 static int
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index eba02e5..af5874e 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -115,6 +115,7 @@ struct x86_platform_ops x86_platform = {
 EXPORT_SYMBOL_GPL(x86_platform);
 struct x86_msi_ops x86_msi = {
 	.setup_msi_irqs		= native_setup_msi_irqs,
+	.compose_msi_msg	= native_compose_msi_msg,
 	.teardown_msi_irq	= native_teardown_msi_irq,
 	.teardown_msi_irqs	= default_teardown_msi_irqs,
 	.restore_msi_irqs	= default_restore_msi_irqs,
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index d9cd920f..e61a174 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -102,6 +102,7 @@ static void __init irq_remapping_modify_x86_ops(void)
 	x86_io_apic_ops.setup_timer_pin	= irq_remapping_setup_timer_pin;
 	x86_msi.setup_msi_irqs		= irq_remapping_setup_msi_irqs;
 	x86_msi.setup_hpet_msi		= setup_hpet_msi_remapped;
+	x86_msi.compose_msi_msg		= compose_remapped_msi_msg;
 }
 
 static __init int setup_nointremap(char *str)
@@ -242,10 +243,12 @@ void compose_remapped_msi_msg(struct pci_dev *pdev,
 			      unsigned int irq, unsigned int dest,
 			      struct msi_msg *msg, u8 hpet_id)
 {
-	if (!remap_ops || !remap_ops->compose_msi_msg)
-		return;
+	struct irq_cfg *cfg = irq_get_chip_data(irq);
 
-	remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
+	if (cfg && !irq_remapped(cfg))
+		native_compose_msi_msg(pdev, irq, dest, msg, hpet_id);
+	else if (remap_ops && remap_ops->compose_msi_msg)
+		remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
 }
 
 static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
-- 
1.7.9.5

[PATCH 18/19] x86, io_apic: Introduce eoi_ioapic_pin call-back

[Joerg Roedel]

This callback replaces the old __eoi_ioapic_pin function
which needs a special path for interrupt remapping.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/io_apic.h  |    4 ++++
 arch/x86/include/asm/x86_init.h |    1 +
 arch/x86/kernel/apic/io_apic.c  |   20 ++++++--------------
 arch/x86/kernel/x86_init.c      |    1 +
 drivers/iommu/irq_remapping.c   |   13 +++++++++++++
 5 files changed, 25 insertions(+), 14 deletions(-)

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 5ffa634..4e812bf 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -163,6 +163,7 @@ extern void eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg);
 extern void native_compose_msi_msg(struct pci_dev *pdev,
 				   unsigned int irq, unsigned int dest,
 				   struct msi_msg *msg, u8 hpet_id);
+extern void native_eoi_ioapic_pin(int apic, int pin, int vector);
 int io_apic_setup_irq_pin_once(unsigned int irq, int node, struct io_apic_irq_attr *attr);
 
 extern int save_ioapic_entries(void);
@@ -210,6 +211,9 @@ static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned
 {
 	x86_io_apic_ops.modify(apic, reg, value);
 }
+
+extern void io_apic_eoi(unsigned int apic, unsigned int vector);
+
 #else  /* !CONFIG_X86_IO_APIC */
 
 #define io_apic_assign_pci_irqs 0
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index 1430af0..5d7faf7 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -213,6 +213,7 @@ struct x86_io_apic_ops {
 				       struct io_apic_irq_attr *attr);
 	void		(*setup_timer_pin)(unsigned int ioapic_idx,
 					   unsigned int pin, int vector);
+	void		(*eoi_ioapic_pin)(int apic, int pin, int vector);
 
 };
 
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 94e2f9d..fc425ce 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -310,7 +310,7 @@ static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
 		+ (mpc_ioapic_addr(idx) & ~PAGE_MASK);
 }
 
-static inline void io_apic_eoi(unsigned int apic, unsigned int vector)
+void io_apic_eoi(unsigned int apic, unsigned int vector)
 {
 	struct io_apic __iomem *io_apic = io_apic_base(apic);
 	writel(vector, &io_apic->eoi);
@@ -557,19 +557,10 @@ static void unmask_ioapic_irq(struct irq_data *data)
  * Otherwise, we simulate the EOI message manually by changing the trigger
  * mode to edge and then back to level, with RTE being masked during this.
  */
-static void __eoi_ioapic_pin(int apic, int pin, int vector, struct irq_cfg *cfg)
+void native_eoi_ioapic_pin(int apic, int pin, int vector)
 {
 	if (mpc_ioapic_ver(apic) >= 0x20) {
-		/*
-		 * Intr-remapping uses pin number as the virtual vector
-		 * in the RTE. Actual vector is programmed in
-		 * intr-remapping table entry. Hence for the io-apic
-		 * EOI we use the pin number.
-		 */
-		if (cfg && irq_remapped(cfg))
-			io_apic_eoi(apic, pin);
-		else
-			io_apic_eoi(apic, vector);
+		io_apic_eoi(apic, vector);
 	} else {
 		struct IO_APIC_route_entry entry, entry1;
 
@@ -597,7 +588,8 @@ void eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg)
 
 	raw_spin_lock_irqsave(&ioapic_lock, flags);
 	for_each_irq_pin(entry, cfg->irq_2_pin)
-		__eoi_ioapic_pin(entry->apic, entry->pin, cfg->vector, cfg);
+		x86_io_apic_ops.eoi_ioapic_pin(entry->apic, entry->pin,
+					       cfg->vector);
 	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
 }
 
@@ -634,7 +626,7 @@ static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
 		}
 
 		raw_spin_lock_irqsave(&ioapic_lock, flags);
-		__eoi_ioapic_pin(apic, pin, entry.vector, NULL);
+		x86_io_apic_ops.eoi_ioapic_pin(apic, pin, entry.vector);
 		raw_spin_unlock_irqrestore(&ioapic_lock, flags);
 	}
 
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index af5874e..589fb84 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -132,4 +132,5 @@ struct x86_io_apic_ops x86_io_apic_ops = {
 	.set_affinity		= native_ioapic_set_affinity,
 	.setup_entry		= native_setup_ioapic_entry,
 	.setup_timer_pin	= native_setup_timer_pin,
+	.eoi_ioapic_pin		= native_eoi_ioapic_pin,
 };
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index e61a174..d62e757 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -94,12 +94,24 @@ static void __init irq_remapping_setup_timer_pin(unsigned int ioapic_idx,
 	/* Not needed with interrupt remapping */
 }
 
+void eoi_ioapic_pin_remapped(int apic, int pin, int vector)
+{
+	/*
+	 * Intr-remapping uses pin number as the virtual vector
+	 * in the RTE. Actual vector is programmed in
+	 * intr-remapping table entry. Hence for the io-apic
+	 * EOI we use the pin number.
+	 */
+	io_apic_eoi(apic, pin);
+}
+
 static void __init irq_remapping_modify_x86_ops(void)
 {
 	x86_io_apic_ops.disable		= irq_remapping_disable_io_apic;
 	x86_io_apic_ops.set_affinity	= set_remapped_irq_affinity;
 	x86_io_apic_ops.setup_entry	= setup_ioapic_remapped_entry;
 	x86_io_apic_ops.setup_timer_pin	= irq_remapping_setup_timer_pin;
+	x86_io_apic_ops.eoi_ioapic_pin	= eoi_ioapic_pin_remapped;
 	x86_msi.setup_msi_irqs		= irq_remapping_setup_msi_irqs;
 	x86_msi.setup_hpet_msi		= setup_hpet_msi_remapped;
 	x86_msi.compose_msi_msg		= compose_remapped_msi_msg;
@@ -316,3 +328,4 @@ bool setup_remapped_irq(int irq, struct irq_cfg *cfg, struct irq_chip *chip)
 		return false;
 	}
 }
+
-- 
1.7.9.5

[PATCH 19/19] x86, irq: Move irq_remapped out of x86 core code

[Joerg Roedel]

The irq_remapped function is only used in IOMMU code after
the last patch. So move its definition there too.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/irq_remapping.h |   10 ----------
 drivers/iommu/irq_remapping.c        |    5 +++++
 2 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h
index b670580..95fd352 100644
--- a/arch/x86/include/asm/irq_remapping.h
+++ b/arch/x86/include/asm/irq_remapping.h
@@ -48,11 +48,6 @@ extern bool setup_remapped_irq(int irq,
 			       struct irq_cfg *cfg,
 			       struct irq_chip *chip);
 
-static inline bool irq_remapped(struct irq_cfg *cfg)
-{
-	return cfg->remapped;
-}
-
 void irq_remap_modify_chip_defaults(struct irq_chip *chip);
 
 #else  /* CONFIG_IRQ_REMAP */
@@ -87,11 +82,6 @@ static inline void panic_if_irq_remap(const char *msg)
 {
 }
 
-static inline bool irq_remapped(struct irq_cfg *cfg)
-{
-	return false;
-}
-
 static inline void irq_remap_modify_chip_defaults(struct irq_chip *chip)
 {
 }
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index d62e757..bf8be56 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -31,6 +31,11 @@ static int set_remapped_irq_affinity(struct irq_data *data,
 				     const struct cpumask *mask,
 				     bool force);
 
+static bool irq_remapped(struct irq_cfg *cfg)
+{
+	return cfg->remapped;
+}
+
 static void irq_remapping_disable_io_apic(void)
 {
 	/*
-- 
1.7.9.5

Re: [PATCH 0/19] Improve IRQ remapping abstraction in x86 core code

[Joerg Roedel]

Hi,

On Tue, Aug 07, 2012 at 05:43:30PM +0200, Joerg Roedel wrote:
> For anyone interested in a git-tree I pushed this code to
> 
> 	git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git ioapic-cleanups

Fengguang Wu found a couple of build errors. And based on his findings I
found some more which are all fixed now. I pushed the patches with the
fixes to the above mentioned tree.

I will repost the whole series once more comments come in which I work
into the patch-set.

Regards,

	Joerg

[PATCH 17/19] x86, msi: Introduce x86_msi.compose_msi_msg call-back

[Joerg Roedel]

This call-back points to the right function for initializing
the msi_msg structure. The old code for msi_msg generation
was split up into the irq-remapped and the default case.

The irq-remapped case just calls into the specific Intel or
AMD implementation when the device is behind an IOMMU.
Otherwise the default function is called.

Signed-off-by: Joerg Roedel <joro@8bytes.org>
Acked-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
---
 arch/x86/include/asm/io_apic.h  |    4 +++
 arch/x86/include/asm/x86_init.h |    4 +++
 arch/x86/kernel/apic/io_apic.c  |   59 ++++++++++++++++++++-------------------
 arch/x86/kernel/x86_init.c      |    1 +
 drivers/iommu/irq_remapping.c   |    9 ++++--
 5 files changed, 46 insertions(+), 31 deletions(-)

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 36fb5ab..1838e88 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -158,6 +158,9 @@ extern int native_setup_ioapic_entry(int, struct IO_APIC_route_entry *,
 				     struct io_apic_irq_attr *);
 extern void eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg);
 
+extern void native_compose_msi_msg(struct pci_dev *pdev,
+				   unsigned int irq, unsigned int dest,
+				   struct msi_msg *msg, u8 hpet_id);
 int io_apic_setup_irq_pin_once(unsigned int irq, int node, struct io_apic_irq_attr *attr);
 
 extern int save_ioapic_entries(void);
@@ -242,6 +245,7 @@ static inline void disable_ioapic_support(void) { }
 #define native_io_apic_print_entries	NULL
 #define native_ioapic_set_affinity	NULL
 #define native_setup_ioapic_entry	NULL
+#define native_compose_msi_msg		NULL
 #endif
 
 #endif /* _ASM_X86_IO_APIC_H */
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index 17da29c..c9f87be 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -181,9 +181,13 @@ struct x86_platform_ops {
 };
 
 struct pci_dev;
+struct msi_msg;
 
 struct x86_msi_ops {
 	int (*setup_msi_irqs)(struct pci_dev *dev, int nvec, int type);
+	void (*compose_msi_msg)(struct pci_dev *dev, unsigned int irq,
+				unsigned int dest, struct msi_msg *msg,
+			       u8 hpet_id);
 	void (*teardown_msi_irq)(unsigned int irq);
 	void (*teardown_msi_irqs)(struct pci_dev *dev);
 	void (*restore_msi_irqs)(struct pci_dev *dev, int irq);
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 391c0b9..d146a04 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3002,37 +3002,16 @@ void destroy_irq(unsigned int irq)
 /*
  * MSI message composition
  */
-#ifdef CONFIG_PCI_MSI
-static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
-			   struct msi_msg *msg, u8 hpet_id)
+void native_compose_msi_msg(struct pci_dev *pdev,
+			    unsigned int irq, unsigned int dest,
+			    struct msi_msg *msg, u8 hpet_id)
 {
-	struct irq_cfg *cfg;
-	int err;
-	unsigned dest;
-
-	if (disable_apic)
-		return -ENXIO;
-
-	cfg = irq_cfg(irq);
-	err = assign_irq_vector(irq, cfg, apic->target_cpus());
-	if (err)
-		return err;
-
-	err = apic->cpu_mask_to_apicid_and(cfg->domain,
-					   apic->target_cpus(), &dest);
-	if (err)
-		return err;
+	struct irq_cfg *cfg = irq_cfg(irq);
 
-	if (irq_remapped(cfg)) {
-		compose_remapped_msi_msg(pdev, irq, dest, msg, hpet_id);
-		return err;
-	}
+	msg->address_hi = MSI_ADDR_BASE_HI;
 
 	if (x2apic_enabled())
-		msg->address_hi = MSI_ADDR_BASE_HI |
-				  MSI_ADDR_EXT_DEST_ID(dest);
-	else
-		msg->address_hi = MSI_ADDR_BASE_HI;
+		msg->address_hi |= MSI_ADDR_EXT_DEST_ID(dest);
 
 	msg->address_lo =
 		MSI_ADDR_BASE_LO |
@@ -3051,8 +3030,32 @@ static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
 			MSI_DATA_DELIVERY_FIXED:
 			MSI_DATA_DELIVERY_LOWPRI) |
 		MSI_DATA_VECTOR(cfg->vector);
+}
 
-	return err;
+#ifdef CONFIG_PCI_MSI
+static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
+			   struct msi_msg *msg, u8 hpet_id)
+{
+	struct irq_cfg *cfg;
+	int err;
+	unsigned dest;
+
+	if (disable_apic)
+		return -ENXIO;
+
+	cfg = irq_cfg(irq);
+	err = assign_irq_vector(irq, cfg, apic->target_cpus());
+	if (err)
+		return err;
+
+	err = apic->cpu_mask_to_apicid_and(cfg->domain,
+					   apic->target_cpus(), &dest);
+	if (err)
+		return err;
+
+	x86_msi.compose_msi_msg(pdev, irq, dest, msg, hpet_id);
+
+	return 0;
 }
 
 static int
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index 06db44f..ee4a17c 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -113,6 +113,7 @@ struct x86_platform_ops x86_platform = {
 EXPORT_SYMBOL_GPL(x86_platform);
 struct x86_msi_ops x86_msi = {
 	.setup_msi_irqs		= native_setup_msi_irqs,
+	.compose_msi_msg	= native_compose_msi_msg,
 	.teardown_msi_irq	= native_teardown_msi_irq,
 	.teardown_msi_irqs	= default_teardown_msi_irqs,
 	.restore_msi_irqs	= default_restore_msi_irqs,
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 30884ee..7055847 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -95,6 +95,7 @@ static void __init irq_remapping_modify_x86_ops(void)
 	x86_io_apic_ops.setup_entry	= setup_ioapic_remapped_entry;
 	x86_msi.setup_msi_irqs		= irq_remapping_setup_msi_irqs;
 	x86_msi.setup_hpet_msi		= setup_hpet_msi_remapped;
+	x86_msi.compose_msi_msg		= compose_remapped_msi_msg;
 }
 
 static __init int setup_nointremap(char *str)
@@ -240,10 +241,12 @@ void compose_remapped_msi_msg(struct pci_dev *pdev,
 			      unsigned int irq, unsigned int dest,
 			      struct msi_msg *msg, u8 hpet_id)
 {
-	if (!remap_ops || !remap_ops->compose_msi_msg)
-		return;
+	struct irq_cfg *cfg = irq_get_chip_data(irq);
 
-	remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
+	if (!irq_remapped(cfg))
+		native_compose_msi_msg(pdev, irq, dest, msg, hpet_id);
+	else if (remap_ops && remap_ops->compose_msi_msg)
+		remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
 }
 
 static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
-- 
1.7.9.5

[PATCH 17/19] x86, msi: Introduce x86_msi.compose_msi_msg call-back

[Joerg Roedel]

This call-back points to the right function for initializing
the msi_msg structure. The old code for msi_msg generation
was split up into the irq-remapped and the default case.

The irq-remapped case just calls into the specific Intel or
AMD implementation when the device is behind an IOMMU.
Otherwise the default function is called.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/io_apic.h  |    4 +++
 arch/x86/include/asm/x86_init.h |    4 +++
 arch/x86/kernel/apic/io_apic.c  |   59 ++++++++++++++++++++-------------------
 arch/x86/kernel/x86_init.c      |    1 +
 drivers/iommu/irq_remapping.c   |    9 ++++--
 5 files changed, 46 insertions(+), 31 deletions(-)

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 36fb5ab..1838e88 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -158,6 +158,9 @@ extern int native_setup_ioapic_entry(int, struct IO_APIC_route_entry *,
 				     struct io_apic_irq_attr *);
 extern void eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg);
 
+extern void native_compose_msi_msg(struct pci_dev *pdev,
+				   unsigned int irq, unsigned int dest,
+				   struct msi_msg *msg, u8 hpet_id);
 int io_apic_setup_irq_pin_once(unsigned int irq, int node, struct io_apic_irq_attr *attr);
 
 extern int save_ioapic_entries(void);
@@ -242,6 +245,7 @@ static inline void disable_ioapic_support(void) { }
 #define native_io_apic_print_entries	NULL
 #define native_ioapic_set_affinity	NULL
 #define native_setup_ioapic_entry	NULL
+#define native_compose_msi_msg		NULL
 #endif
 
 #endif /* _ASM_X86_IO_APIC_H */
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index bc13022..3ef598e 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -180,9 +180,13 @@ struct x86_platform_ops {
 };
 
 struct pci_dev;
+struct msi_msg;
 
 struct x86_msi_ops {
 	int (*setup_msi_irqs)(struct pci_dev *dev, int nvec, int type);
+	void (*compose_msi_msg)(struct pci_dev *dev, unsigned int irq,
+				unsigned int dest, struct msi_msg *msg,
+			       u8 hpet_id);
 	void (*teardown_msi_irq)(unsigned int irq);
 	void (*teardown_msi_irqs)(struct pci_dev *dev);
 	void (*restore_msi_irqs)(struct pci_dev *dev, int irq);
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 88c4fff..c545a1d 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2999,37 +2999,16 @@ void destroy_irq(unsigned int irq)
 /*
  * MSI message composition
  */
-#ifdef CONFIG_PCI_MSI
-static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
-			   struct msi_msg *msg, u8 hpet_id)
+void native_compose_msi_msg(struct pci_dev *pdev,
+			    unsigned int irq, unsigned int dest,
+			    struct msi_msg *msg, u8 hpet_id)
 {
-	struct irq_cfg *cfg;
-	int err;
-	unsigned dest;
-
-	if (disable_apic)
-		return -ENXIO;
-
-	cfg = irq_cfg(irq);
-	err = assign_irq_vector(irq, cfg, apic->target_cpus());
-	if (err)
-		return err;
-
-	err = apic->cpu_mask_to_apicid_and(cfg->domain,
-					   apic->target_cpus(), &dest);
-	if (err)
-		return err;
+	struct irq_cfg *cfg = irq_cfg(irq);
 
-	if (irq_remapped(cfg)) {
-		compose_remapped_msi_msg(pdev, irq, dest, msg, hpet_id);
-		return err;
-	}
+	msg->address_hi = MSI_ADDR_BASE_HI;
 
 	if (x2apic_enabled())
-		msg->address_hi = MSI_ADDR_BASE_HI |
-				  MSI_ADDR_EXT_DEST_ID(dest);
-	else
-		msg->address_hi = MSI_ADDR_BASE_HI;
+		msg->address_hi |= MSI_ADDR_EXT_DEST_ID(dest);
 
 	msg->address_lo =
 		MSI_ADDR_BASE_LO |
@@ -3048,8 +3027,32 @@ static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
 			MSI_DATA_DELIVERY_FIXED:
 			MSI_DATA_DELIVERY_LOWPRI) |
 		MSI_DATA_VECTOR(cfg->vector);
+}
 
-	return err;
+#ifdef CONFIG_PCI_MSI
+static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
+			   struct msi_msg *msg, u8 hpet_id)
+{
+	struct irq_cfg *cfg;
+	int err;
+	unsigned dest;
+
+	if (disable_apic)
+		return -ENXIO;
+
+	cfg = irq_cfg(irq);
+	err = assign_irq_vector(irq, cfg, apic->target_cpus());
+	if (err)
+		return err;
+
+	err = apic->cpu_mask_to_apicid_and(cfg->domain,
+					   apic->target_cpus(), &dest);
+	if (err)
+		return err;
+
+	x86_msi.compose_msi_msg(pdev, irq, dest, msg, hpet_id);
+
+	return 0;
 }
 
 static int
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index 3cd6bf7..357d127 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -115,6 +115,7 @@ struct x86_platform_ops x86_platform = {
 EXPORT_SYMBOL_GPL(x86_platform);
 struct x86_msi_ops x86_msi = {
 	.setup_msi_irqs		= native_setup_msi_irqs,
+	.compose_msi_msg	= native_compose_msi_msg,
 	.teardown_msi_irq	= native_teardown_msi_irq,
 	.teardown_msi_irqs	= default_teardown_msi_irqs,
 	.restore_msi_irqs	= default_restore_msi_irqs,
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 1e6bc13..92351f8 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -95,6 +95,7 @@ static void __init irq_remapping_modify_x86_ops(void)
 	x86_io_apic_ops.setup_entry	= setup_ioapic_remapped_entry;
 	x86_msi.setup_msi_irqs		= irq_remapping_setup_msi_irqs;
 	x86_msi.setup_hpet_msi		= setup_hpet_msi_remapped;
+	x86_msi.compose_msi_msg		= compose_remapped_msi_msg;
 }
 
 static __init int setup_nointremap(char *str)
@@ -235,10 +236,12 @@ void compose_remapped_msi_msg(struct pci_dev *pdev,
 			      unsigned int irq, unsigned int dest,
 			      struct msi_msg *msg, u8 hpet_id)
 {
-	if (!remap_ops || !remap_ops->compose_msi_msg)
-		return;
+	struct irq_cfg *cfg = irq_get_chip_data(irq);
 
-	remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
+	if (!irq_remapped(cfg))
+		native_compose_msi_msg(pdev, irq, dest, msg, hpet_id);
+	else if (remap_ops && remap_ops->compose_msi_msg)
+		remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
 }
 
 static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
-- 
1.7.9.5

Re: [PATCH 17/19] x86, msi: Introduce x86_msi.compose_msi_msg call-back

[Joerg Roedel]

On Sun, Aug 26, 2012 at 08:41:40PM +0200, Sebastian Andrzej Siewior wrote:
> On Mon, Aug 20, 2012 at 03:56:03PM +0200, Joerg Roedel wrote:
> > This call-back points to the right function for initializing
> > the msi_msg structure.
> 
> So you pull out the compose_remapped_msi_msg() out of msi_compose_msg() and
> put this in a callback. Such information is good since you don't see this in
> diff and even --patience does not help here.

Added that to the commit message.

> 
> > --- a/drivers/iommu/irq_remapping.c
> > +++ b/drivers/iommu/irq_remapping.c
> > @@ -242,10 +243,12 @@ void compose_remapped_msi_msg(struct pci_dev *pdev,
> >  			      unsigned int irq, unsigned int dest,
> >  			      struct msi_msg *msg, u8 hpet_id)
> >  {
> > -	if (!remap_ops || !remap_ops->compose_msi_msg)
> > -		return;
> > +	struct irq_cfg *cfg = irq_get_chip_data(irq);
> >  
> > -	remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
> > +	if (cfg && !irq_remapped(cfg))
> > +		native_compose_msi_msg(pdev, irq, dest, msg, hpet_id);
> > +	else if (remap_ops && remap_ops->compose_msi_msg)
> > +		remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
> 
> cfg _has_ to be valid here and if it is not than you shouldn't assume that
> this irq is remapped.
> Also remap_ops has to be set here. And ->compose_msi_msg() should be set
> here as well. Would it make sense if it is not set?

I removed the check for cfg, but I am still conservative on calling
function pointers without checking them first.


	Joerg

-- 
AMD Operating System Research Center

Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach
General Managers: Alberto Bozzo
Registration: Dornach, Landkr. Muenchen; Registerger. Muenchen, HRB Nr. 43632

Re: [PATCH 17/19] x86, msi: Introduce x86_msi.compose_msi_msg call-back

[Sebastian Andrzej Siewior]

On Mon, Aug 20, 2012 at 03:56:03PM +0200, Joerg Roedel wrote:
> This call-back points to the right function for initializing
> the msi_msg structure.

So you pull out the compose_remapped_msi_msg() out of msi_compose_msg() and
put this in a callback. Such information is good since you don't see this in
diff and even --patience does not help here.

> --- a/drivers/iommu/irq_remapping.c
> +++ b/drivers/iommu/irq_remapping.c
> @@ -242,10 +243,12 @@ void compose_remapped_msi_msg(struct pci_dev *pdev,
>  			      unsigned int irq, unsigned int dest,
>  			      struct msi_msg *msg, u8 hpet_id)
>  {
> -	if (!remap_ops || !remap_ops->compose_msi_msg)
> -		return;
> +	struct irq_cfg *cfg = irq_get_chip_data(irq);
>  
> -	remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
> +	if (cfg && !irq_remapped(cfg))
> +		native_compose_msi_msg(pdev, irq, dest, msg, hpet_id);
> +	else if (remap_ops && remap_ops->compose_msi_msg)
> +		remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);

cfg _has_ to be valid here and if it is not than you shouldn't assume that
this irq is remapped.
Also remap_ops has to be set here. And ->compose_msi_msg() should be set
here as well. Would it make sense if it is not set?

>  }
>  
>  static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)

Sebastian

Re: [PATCH 17/19] x86, msi: Introduce x86_msi.compose_msi_msg call-back

[Joerg Roedel]

On Tue, Aug 21, 2012 at 10:42:57AM -0400, Konrad Rzeszutek Wilk wrote:
> On Tue, Aug 21, 2012 at 10:40:07AM +0200, Joerg Roedel wrote:
> > On Mon, Aug 20, 2012 at 10:08:44AM -0400, Konrad Rzeszutek Wilk wrote:
> > > On Mon, Aug 20, 2012 at 03:56:03PM +0200, Joerg Roedel wrote:
> > > > This call-back points to the right function for initializing
> > > > the msi_msg structure.
> > > 
> > > What is the 'hpet_id' purpose in this?
> > 
> > The VT-d implementation uses it. This function is used to create the MSI
> > message for PCI devices and the HPET. When it is called for the HPET the
> > pdev parameter is NULL and hpet_id is valid.
> 
> Perhaps then a more generic term? 'void *platform_priv' ?

Okay, I looked into the code a bit more and the best solution is to
remove the pdev and hpet_id parameters completly from the
msi_compose_msg path. The only user of these parameters is the Intel
interrupt remapping code which can also set the source-ids in the
irq-alloc path. But this is a larger effort which is best done in a
seperate patch-set.


	Joerg

Re: [PATCH 17/19] x86, msi: Introduce x86_msi.compose_msi_msg call-back

[Joerg Roedel]

On Tue, Aug 21, 2012 at 10:42:57AM -0400, Konrad Rzeszutek Wilk wrote:
> On Tue, Aug 21, 2012 at 10:40:07AM +0200, Joerg Roedel wrote:
> > On Mon, Aug 20, 2012 at 10:08:44AM -0400, Konrad Rzeszutek Wilk wrote:
> > > On Mon, Aug 20, 2012 at 03:56:03PM +0200, Joerg Roedel wrote:
> > > > This call-back points to the right function for initializing
> > > > the msi_msg structure.
> > > 
> > > What is the 'hpet_id' purpose in this?
> > 
> > The VT-d implementation uses it. This function is used to create the MSI
> > message for PCI devices and the HPET. When it is called for the HPET the
> > pdev parameter is NULL and hpet_id is valid.
> 
> Perhaps then a more generic term? 'void *platform_priv' ?

Well, the best approach is probably to remove both, the pdev and the
hpet parameter and replace it with an req_id parameter that is passed
down instead. IOMMU code needs to expose the hpet request-ids then with
another call-back. But that is cleaner than the current compose_msi_msg
call-back.


	Joerg

-- 
AMD Operating System Research Center

Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach
General Managers: Alberto Bozzo
Registration: Dornach, Landkr. Muenchen; Registerger. Muenchen, HRB Nr. 43632

Re: [PATCH 17/19] x86, msi: Introduce x86_msi.compose_msi_msg call-back

[Joerg Roedel]

On Tue, Aug 21, 2012 at 10:42:57AM -0400, Konrad Rzeszutek Wilk wrote:
> On Tue, Aug 21, 2012 at 10:40:07AM +0200, Joerg Roedel wrote:
> > The VT-d implementation uses it. This function is used to create the MSI
> > message for PCI devices and the HPET. When it is called for the HPET the
> > pdev parameter is NULL and hpet_id is valid.
> 
> Perhaps then a more generic term? 'void *platform_priv' ?

Doesn't work this way here. The Intel code detects on pdev==NULL that it
needs to use hpet_id. What could work is to split the code-paths between
pci_dev msi composition and the one for hpet.
But that approach has the downside of code duplication to some degree.


Regards,

	Joerg

-- 
AMD Operating System Research Center

Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach
General Managers: Alberto Bozzo
Registration: Dornach, Landkr. Muenchen; Registerger. Muenchen, HRB Nr. 43632

Re: [PATCH 17/19] x86, msi: Introduce x86_msi.compose_msi_msg call-back

[Konrad Rzeszutek Wilk]

On Tue, Aug 21, 2012 at 10:40:07AM +0200, Joerg Roedel wrote:
> On Mon, Aug 20, 2012 at 10:08:44AM -0400, Konrad Rzeszutek Wilk wrote:
> > On Mon, Aug 20, 2012 at 03:56:03PM +0200, Joerg Roedel wrote:
> > > This call-back points to the right function for initializing
> > > the msi_msg structure.
> > 
> > What is the 'hpet_id' purpose in this?
> 
> The VT-d implementation uses it. This function is used to create the MSI
> message for PCI devices and the HPET. When it is called for the HPET the
> pdev parameter is NULL and hpet_id is valid.

Perhaps then a more generic term? 'void *platform_priv' ?

Re: [PATCH 17/19] x86, msi: Introduce x86_msi.compose_msi_msg call-back

[Joerg Roedel]

On Mon, Aug 20, 2012 at 10:08:44AM -0400, Konrad Rzeszutek Wilk wrote:
> On Mon, Aug 20, 2012 at 03:56:03PM +0200, Joerg Roedel wrote:
> > This call-back points to the right function for initializing
> > the msi_msg structure.
> 
> What is the 'hpet_id' purpose in this?

The VT-d implementation uses it. This function is used to create the MSI
message for PCI devices and the HPET. When it is called for the HPET the
pdev parameter is NULL and hpet_id is valid.


	Joerg

-- 
AMD Operating System Research Center

Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach
General Managers: Alberto Bozzo
Registration: Dornach, Landkr. Muenchen; Registerger. Muenchen, HRB Nr. 43632

Re: [PATCH 17/19] x86, msi: Introduce x86_msi.compose_msi_msg call-back

[Konrad Rzeszutek Wilk]

On Mon, Aug 20, 2012 at 03:56:03PM +0200, Joerg Roedel wrote:
> This call-back points to the right function for initializing
> the msi_msg structure.

What is the 'hpet_id' purpose in this?

> 
> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
> ---
>  arch/x86/include/asm/io_apic.h  |    4 +++
>  arch/x86/include/asm/x86_init.h |    4 +++
>  arch/x86/kernel/apic/io_apic.c  |   59 ++++++++++++++++++++-------------------
>  arch/x86/kernel/x86_init.c      |    1 +
>  drivers/iommu/irq_remapping.c   |    9 ++++--
>  5 files changed, 46 insertions(+), 31 deletions(-)
> 
> diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
> index 0db4429..59a3f4e 100644
> --- a/arch/x86/include/asm/io_apic.h
> +++ b/arch/x86/include/asm/io_apic.h
> @@ -160,6 +160,9 @@ extern void __init native_setup_timer_pin(unsigned int ioapic_idx,
>  					  unsigned int pin, int vector);
>  extern void eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg);
>  
> +extern void native_compose_msi_msg(struct pci_dev *pdev,
> +				   unsigned int irq, unsigned int dest,
> +				   struct msi_msg *msg, u8 hpet_id);
>  int io_apic_setup_irq_pin_once(unsigned int irq, int node, struct io_apic_irq_attr *attr);
>  
>  extern int save_ioapic_entries(void);
> @@ -245,6 +248,7 @@ static inline void disable_ioapic_support(void) { }
>  #define native_ioapic_set_affinity	NULL
>  #define native_setup_ioapic_entry	NULL
>  #define native_setup_timer_pin		NULL
> +#define native_compose_msi_msg		NULL
>  #endif
>  
>  #endif /* _ASM_X86_IO_APIC_H */
> diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
> index ffe5860..1430af0 100644
> --- a/arch/x86/include/asm/x86_init.h
> +++ b/arch/x86/include/asm/x86_init.h
> @@ -180,9 +180,13 @@ struct x86_platform_ops {
>  };
>  
>  struct pci_dev;
> +struct msi_msg;
>  
>  struct x86_msi_ops {
>  	int (*setup_msi_irqs)(struct pci_dev *dev, int nvec, int type);
> +	void (*compose_msi_msg)(struct pci_dev *dev, unsigned int irq,
> +				unsigned int dest, struct msi_msg *msg,
> +			       u8 hpet_id);
>  	void (*teardown_msi_irq)(unsigned int irq);
>  	void (*teardown_msi_irqs)(struct pci_dev *dev);
>  	void (*restore_msi_irqs)(struct pci_dev *dev, int irq);
> diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
> index c2f2d2d..aac3f62 100644
> --- a/arch/x86/kernel/apic/io_apic.c
> +++ b/arch/x86/kernel/apic/io_apic.c
> @@ -2989,37 +2989,16 @@ void destroy_irq(unsigned int irq)
>  /*
>   * MSI message composition
>   */
> -#ifdef CONFIG_PCI_MSI
> -static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
> -			   struct msi_msg *msg, u8 hpet_id)
> +void native_compose_msi_msg(struct pci_dev *pdev,
> +			    unsigned int irq, unsigned int dest,
> +			    struct msi_msg *msg, u8 hpet_id)
>  {
> -	struct irq_cfg *cfg;
> -	int err;
> -	unsigned dest;
> -
> -	if (disable_apic)
> -		return -ENXIO;
> -
> -	cfg = irq_cfg(irq);
> -	err = assign_irq_vector(irq, cfg, apic->target_cpus());
> -	if (err)
> -		return err;
> -
> -	err = apic->cpu_mask_to_apicid_and(cfg->domain,
> -					   apic->target_cpus(), &dest);
> -	if (err)
> -		return err;
> +	struct irq_cfg *cfg = irq_cfg(irq);
>  
> -	if (irq_remapped(cfg)) {
> -		compose_remapped_msi_msg(pdev, irq, dest, msg, hpet_id);
> -		return err;
> -	}
> +	msg->address_hi = MSI_ADDR_BASE_HI;
>  
>  	if (x2apic_enabled())
> -		msg->address_hi = MSI_ADDR_BASE_HI |
> -				  MSI_ADDR_EXT_DEST_ID(dest);
> -	else
> -		msg->address_hi = MSI_ADDR_BASE_HI;
> +		msg->address_hi |= MSI_ADDR_EXT_DEST_ID(dest);
>  
>  	msg->address_lo =
>  		MSI_ADDR_BASE_LO |
> @@ -3038,8 +3017,32 @@ static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
>  			MSI_DATA_DELIVERY_FIXED:
>  			MSI_DATA_DELIVERY_LOWPRI) |
>  		MSI_DATA_VECTOR(cfg->vector);
> +}
>  
> -	return err;
> +#ifdef CONFIG_PCI_MSI
> +static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
> +			   struct msi_msg *msg, u8 hpet_id)
> +{
> +	struct irq_cfg *cfg;
> +	int err;
> +	unsigned dest;
> +
> +	if (disable_apic)
> +		return -ENXIO;
> +
> +	cfg = irq_cfg(irq);
> +	err = assign_irq_vector(irq, cfg, apic->target_cpus());
> +	if (err)
> +		return err;
> +
> +	err = apic->cpu_mask_to_apicid_and(cfg->domain,
> +					   apic->target_cpus(), &dest);
> +	if (err)
> +		return err;
> +
> +	x86_msi.compose_msi_msg(pdev, irq, dest, msg, hpet_id);
> +
> +	return 0;
>  }
>  
>  static int
> diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
> index eba02e5..af5874e 100644
> --- a/arch/x86/kernel/x86_init.c
> +++ b/arch/x86/kernel/x86_init.c
> @@ -115,6 +115,7 @@ struct x86_platform_ops x86_platform = {
>  EXPORT_SYMBOL_GPL(x86_platform);
>  struct x86_msi_ops x86_msi = {
>  	.setup_msi_irqs		= native_setup_msi_irqs,
> +	.compose_msi_msg	= native_compose_msi_msg,
>  	.teardown_msi_irq	= native_teardown_msi_irq,
>  	.teardown_msi_irqs	= default_teardown_msi_irqs,
>  	.restore_msi_irqs	= default_restore_msi_irqs,
> diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
> index d9cd920f..e61a174 100644
> --- a/drivers/iommu/irq_remapping.c
> +++ b/drivers/iommu/irq_remapping.c
> @@ -102,6 +102,7 @@ static void __init irq_remapping_modify_x86_ops(void)
>  	x86_io_apic_ops.setup_timer_pin	= irq_remapping_setup_timer_pin;
>  	x86_msi.setup_msi_irqs		= irq_remapping_setup_msi_irqs;
>  	x86_msi.setup_hpet_msi		= setup_hpet_msi_remapped;
> +	x86_msi.compose_msi_msg		= compose_remapped_msi_msg;
>  }
>  
>  static __init int setup_nointremap(char *str)
> @@ -242,10 +243,12 @@ void compose_remapped_msi_msg(struct pci_dev *pdev,
>  			      unsigned int irq, unsigned int dest,
>  			      struct msi_msg *msg, u8 hpet_id)
>  {
> -	if (!remap_ops || !remap_ops->compose_msi_msg)
> -		return;
> +	struct irq_cfg *cfg = irq_get_chip_data(irq);
>  
> -	remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
> +	if (cfg && !irq_remapped(cfg))
> +		native_compose_msi_msg(pdev, irq, dest, msg, hpet_id);
> +	else if (remap_ops && remap_ops->compose_msi_msg)
> +		remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
>  }
>  
>  static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
> -- 
> 1.7.9.5
> 
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> Please read the FAQ at  http://www.tux.org/lkml/
> 

[PATCH 17/19] x86, msi: Introduce x86_msi.compose_msi_msg call-back

[Joerg Roedel]

This call-back points to the right function for initializing
the msi_msg structure.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/io_apic.h  |    4 +++
 arch/x86/include/asm/x86_init.h |    4 +++
 arch/x86/kernel/apic/io_apic.c  |   59 ++++++++++++++++++++-------------------
 arch/x86/kernel/x86_init.c      |    1 +
 drivers/iommu/irq_remapping.c   |    9 ++++--
 5 files changed, 46 insertions(+), 31 deletions(-)

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 0db4429..59a3f4e 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -160,6 +160,9 @@ extern void __init native_setup_timer_pin(unsigned int ioapic_idx,
 					  unsigned int pin, int vector);
 extern void eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg);
 
+extern void native_compose_msi_msg(struct pci_dev *pdev,
+				   unsigned int irq, unsigned int dest,
+				   struct msi_msg *msg, u8 hpet_id);
 int io_apic_setup_irq_pin_once(unsigned int irq, int node, struct io_apic_irq_attr *attr);
 
 extern int save_ioapic_entries(void);
@@ -245,6 +248,7 @@ static inline void disable_ioapic_support(void) { }
 #define native_ioapic_set_affinity	NULL
 #define native_setup_ioapic_entry	NULL
 #define native_setup_timer_pin		NULL
+#define native_compose_msi_msg		NULL
 #endif
 
 #endif /* _ASM_X86_IO_APIC_H */
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index ffe5860..1430af0 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -180,9 +180,13 @@ struct x86_platform_ops {
 };
 
 struct pci_dev;
+struct msi_msg;
 
 struct x86_msi_ops {
 	int (*setup_msi_irqs)(struct pci_dev *dev, int nvec, int type);
+	void (*compose_msi_msg)(struct pci_dev *dev, unsigned int irq,
+				unsigned int dest, struct msi_msg *msg,
+			       u8 hpet_id);
 	void (*teardown_msi_irq)(unsigned int irq);
 	void (*teardown_msi_irqs)(struct pci_dev *dev);
 	void (*restore_msi_irqs)(struct pci_dev *dev, int irq);
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index c2f2d2d..aac3f62 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2989,37 +2989,16 @@ void destroy_irq(unsigned int irq)
 /*
  * MSI message composition
  */
-#ifdef CONFIG_PCI_MSI
-static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
-			   struct msi_msg *msg, u8 hpet_id)
+void native_compose_msi_msg(struct pci_dev *pdev,
+			    unsigned int irq, unsigned int dest,
+			    struct msi_msg *msg, u8 hpet_id)
 {
-	struct irq_cfg *cfg;
-	int err;
-	unsigned dest;
-
-	if (disable_apic)
-		return -ENXIO;
-
-	cfg = irq_cfg(irq);
-	err = assign_irq_vector(irq, cfg, apic->target_cpus());
-	if (err)
-		return err;
-
-	err = apic->cpu_mask_to_apicid_and(cfg->domain,
-					   apic->target_cpus(), &dest);
-	if (err)
-		return err;
+	struct irq_cfg *cfg = irq_cfg(irq);
 
-	if (irq_remapped(cfg)) {
-		compose_remapped_msi_msg(pdev, irq, dest, msg, hpet_id);
-		return err;
-	}
+	msg->address_hi = MSI_ADDR_BASE_HI;
 
 	if (x2apic_enabled())
-		msg->address_hi = MSI_ADDR_BASE_HI |
-				  MSI_ADDR_EXT_DEST_ID(dest);
-	else
-		msg->address_hi = MSI_ADDR_BASE_HI;
+		msg->address_hi |= MSI_ADDR_EXT_DEST_ID(dest);
 
 	msg->address_lo =
 		MSI_ADDR_BASE_LO |
@@ -3038,8 +3017,32 @@ static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
 			MSI_DATA_DELIVERY_FIXED:
 			MSI_DATA_DELIVERY_LOWPRI) |
 		MSI_DATA_VECTOR(cfg->vector);
+}
 
-	return err;
+#ifdef CONFIG_PCI_MSI
+static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
+			   struct msi_msg *msg, u8 hpet_id)
+{
+	struct irq_cfg *cfg;
+	int err;
+	unsigned dest;
+
+	if (disable_apic)
+		return -ENXIO;
+
+	cfg = irq_cfg(irq);
+	err = assign_irq_vector(irq, cfg, apic->target_cpus());
+	if (err)
+		return err;
+
+	err = apic->cpu_mask_to_apicid_and(cfg->domain,
+					   apic->target_cpus(), &dest);
+	if (err)
+		return err;
+
+	x86_msi.compose_msi_msg(pdev, irq, dest, msg, hpet_id);
+
+	return 0;
 }
 
 static int
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index eba02e5..af5874e 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -115,6 +115,7 @@ struct x86_platform_ops x86_platform = {
 EXPORT_SYMBOL_GPL(x86_platform);
 struct x86_msi_ops x86_msi = {
 	.setup_msi_irqs		= native_setup_msi_irqs,
+	.compose_msi_msg	= native_compose_msi_msg,
 	.teardown_msi_irq	= native_teardown_msi_irq,
 	.teardown_msi_irqs	= default_teardown_msi_irqs,
 	.restore_msi_irqs	= default_restore_msi_irqs,
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index d9cd920f..e61a174 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -102,6 +102,7 @@ static void __init irq_remapping_modify_x86_ops(void)
 	x86_io_apic_ops.setup_timer_pin	= irq_remapping_setup_timer_pin;
 	x86_msi.setup_msi_irqs		= irq_remapping_setup_msi_irqs;
 	x86_msi.setup_hpet_msi		= setup_hpet_msi_remapped;
+	x86_msi.compose_msi_msg		= compose_remapped_msi_msg;
 }
 
 static __init int setup_nointremap(char *str)
@@ -242,10 +243,12 @@ void compose_remapped_msi_msg(struct pci_dev *pdev,
 			      unsigned int irq, unsigned int dest,
 			      struct msi_msg *msg, u8 hpet_id)
 {
-	if (!remap_ops || !remap_ops->compose_msi_msg)
-		return;
+	struct irq_cfg *cfg = irq_get_chip_data(irq);
 
-	remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
+	if (cfg && !irq_remapped(cfg))
+		native_compose_msi_msg(pdev, irq, dest, msg, hpet_id);
+	else if (remap_ops && remap_ops->compose_msi_msg)
+		remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
 }
 
 static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
-- 
1.7.9.5