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Subject[PATCH 04/19] x86, io_apic: Introduce x86_io_apic_ops.print_entries for debugging
Date
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 | 3 +
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, 65 insertions(+), 53 deletions(-)

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index d59e172..21aa81e 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)
{
@@ -225,6 +227,7 @@ static inline void disable_ioapic_support(void) { }
#define native_io_apic_write NULL
#define native_io_apic_modify NULL
#define native_disable_io_apic NULL
+#define native_io_apic_print_entries 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 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 b919f1e..1ac89a6 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



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