irqchip/mbigen: Fix mbigen node address layout

The mbigen interrupt chip has its per node registers located in a
contiguous region of page sized chunks. The code maps them into virtual
address space as a contiguous region and determines the address of a node
by using the node ID as index.

                    mbigen chip
       |-----------------|------------|--------------|
   mgn_node_0         mgn_node_1     ...         mgn_node_i
|--------------|   |--------------|       |----------------------|
[0x0000, 0x0x0FFF] [0x1000, 0x1FFF]    [i*0x1000, (i+1)*0x1000 - 1]

This works correctly up to 10 nodes, but then fails because the 11th's
array slot is used for the MGN_CLEAR registers.

                         mbigen chip
    |-----------|--------|--------|---------------|--------|
mgn_node_0  mgn_node_1  ...  mgn_clear_register  ...   mgn_node_i
                            |-----------------|
                             [0xA000, 0xAFFF]

Skip the MGN_CLEAR register space when calculating the offset for node IDs
greater than or equal to ten.

Fixes: a6c2f87b8820 ("irqchip/mbigen: Implement the mbigen irq chip operation functions")
Signed-off-by: Yipeng Zou <zouyipeng@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20240730014400.1751530-1-zouyipeng@huawei.com

diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c
index 093fd42..53cc083 100644 (file)
--- a/drivers/irqchip/irq-mbigen.c
+++ b/drivers/irqchip/irq-mbigen.c
@@ -64,6 +64,20 @@ struct mbigen_device {
        void __iomem            *base;
 };
 
+static inline unsigned int get_mbigen_node_offset(unsigned int nid)
+{
+       unsigned int offset = nid * MBIGEN_NODE_OFFSET;
+
+       /*
+        * To avoid touched clear register in unexpected way, we need to directly
+        * skip clear register when access to more than 10 mbigen nodes.
+        */
+       if (nid >= (REG_MBIGEN_CLEAR_OFFSET / MBIGEN_NODE_OFFSET))
+               offset += MBIGEN_NODE_OFFSET;
+
+       return offset;
+}
+
 static inline unsigned int get_mbigen_vec_reg(irq_hw_number_t hwirq)
 {
        unsigned int nid, pin;
@@ -72,8 +86,7 @@ static inline unsigned int get_mbigen_vec_reg(irq_hw_number_t hwirq)
        nid = hwirq / IRQS_PER_MBIGEN_NODE + 1;
        pin = hwirq % IRQS_PER_MBIGEN_NODE;
 
-       return pin * 4 + nid * MBIGEN_NODE_OFFSET
-                       + REG_MBIGEN_VEC_OFFSET;
+       return pin * 4 + get_mbigen_node_offset(nid) + REG_MBIGEN_VEC_OFFSET;
 }
 
 static inline void get_mbigen_type_reg(irq_hw_number_t hwirq,
@@ -88,8 +101,7 @@ static inline void get_mbigen_type_reg(irq_hw_number_t hwirq,
        *mask = 1 << (irq_ofst % 32);
        ofst = irq_ofst / 32 * 4;
 
-       *addr = ofst + nid * MBIGEN_NODE_OFFSET
-               + REG_MBIGEN_TYPE_OFFSET;
+       *addr = ofst + get_mbigen_node_offset(nid) + REG_MBIGEN_TYPE_OFFSET;
 }
 
 static inline void get_mbigen_clear_reg(irq_hw_number_t hwirq,