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-rw-r--r--Documentation/IRQ-domain.txt36
1 files changed, 2 insertions, 34 deletions
diff --git a/Documentation/IRQ-domain.txt b/Documentation/IRQ-domain.txt
index 4a1cd7645d85..507775cce753 100644
--- a/Documentation/IRQ-domain.txt
+++ b/Documentation/IRQ-domain.txt
@@ -265,37 +265,5 @@ support other architectures, such as ARM, ARM64 etc.
=== Debugging ===
-If you switch on CONFIG_IRQ_DOMAIN_DEBUG (which depends on
-CONFIG_IRQ_DOMAIN and CONFIG_DEBUG_FS), you will find a new file in
-your debugfs mount point, called irq_domain_mapping. This file
-contains a live snapshot of all the IRQ domains in the system:
-
- name mapped linear-max direct-max devtree-node
- pl061 8 8 0 /smb/gpio@e0080000
- pl061 8 8 0 /smb/gpio@e1050000
- pMSI 0 0 0 /interrupt-controller@e1101000/v2m@e0080000
- MSI 37 0 0 /interrupt-controller@e1101000/v2m@e0080000
- GICv2m 37 0 0 /interrupt-controller@e1101000/v2m@e0080000
- GICv2 448 448 0 /interrupt-controller@e1101000
-
-it also iterates over the interrupts to display their mapping in the
-domains, and makes the domain stacking visible:
-
-
-irq hwirq chip name chip data active type domain
- 1 0x00019 GICv2 0xffff00000916bfd8 * LINEAR GICv2
- 2 0x0001d GICv2 0xffff00000916bfd8 LINEAR GICv2
- 3 0x0001e GICv2 0xffff00000916bfd8 * LINEAR GICv2
- 4 0x0001b GICv2 0xffff00000916bfd8 * LINEAR GICv2
- 5 0x0001a GICv2 0xffff00000916bfd8 LINEAR GICv2
-[...]
- 96 0x81808 MSI 0x (null) RADIX MSI
- 96+ 0x00063 GICv2m 0xffff8003ee116980 RADIX GICv2m
- 96+ 0x00063 GICv2 0xffff00000916bfd8 LINEAR GICv2
- 97 0x08800 MSI 0x (null) * RADIX MSI
- 97+ 0x00064 GICv2m 0xffff8003ee116980 * RADIX GICv2m
- 97+ 0x00064 GICv2 0xffff00000916bfd8 * LINEAR GICv2
-
-Here, interrupts 1-5 are only using a single domain, while 96 and 97
-are build out of a stack of three domain, each level performing a
-particular function.
+Most of the internals of the IRQ subsystem are exposed in debugfs by
+turning CONFIG_GENERIC_IRQ_DEBUGFS on.