Re: [PATCH v2] irqchip/loongson-pch-pic: Update interrupt registration policy
From: Binbin Zhou
Date: Thu Mar 21 2024 - 02:11:00 EST
Hi Tianyang:
On 2024/3/16 16:21, Tianyang Zhang wrote:
From: Baoqi Zhang <zhangbaoqi@xxxxxxxxxxx>
This patch remove the fixed mapping between the 7A interrupt source
and the HT interrupt vector, and replaced it with a dynamically
allocated approach.
We introduce a mapping table in struct pch_pic, where each interrupt
source will allocate an index as a 'hwirq' from the table in the order
of application and set table value as interrupt source number. This hwirq
will be configured as its vector in the HT interrupt controller. For an
interrupt source, the validity period of the obtained hwirq will last until
the system reset
This will be more conducive to fully utilizing existing vectors to
support more devices
Signed-off-by: Baoqi Zhang <zhangbaoqi@xxxxxxxxxxx>
Signed-off-by: Biao Dong <dongbiao@xxxxxxxxxxx>
Signed-off-by: Tianyang Zhang <zhangtianyang@xxxxxxxxxxx>
---
drivers/irqchip/irq-loongson-pch-pic.c | 77 ++++++++++++++++++++------
1 file changed, 59 insertions(+), 18 deletions(-)
diff --git a/drivers/irqchip/irq-loongson-pch-pic.c b/drivers/irqchip/irq-loongson-pch-pic.c
index 63db8e2172e0..f17187641154 100644
--- a/drivers/irqchip/irq-loongson-pch-pic.c
+++ b/drivers/irqchip/irq-loongson-pch-pic.c
@@ -33,7 +33,7 @@
#define PIC_COUNT (PIC_COUNT_PER_REG * PIC_REG_COUNT)
#define PIC_REG_IDX(irq_id) ((irq_id) / PIC_COUNT_PER_REG)
#define PIC_REG_BIT(irq_id) ((irq_id) % PIC_COUNT_PER_REG)
-
+#define PIC_UNDEF_VECTOR 255
static int nr_pics;
struct pch_pic {
@@ -46,12 +46,19 @@ struct pch_pic {
u32 saved_vec_en[PIC_REG_COUNT];
u32 saved_vec_pol[PIC_REG_COUNT];
u32 saved_vec_edge[PIC_REG_COUNT];
+ u8 table[PIC_COUNT];
+ int inuse;
};
static struct pch_pic *pch_pic_priv[MAX_IO_PICS];
struct fwnode_handle *pch_pic_handle[MAX_IO_PICS];
+static inline u8 hwirq_to_bit(struct pch_pic *priv, int hirq)
+{
+ return priv->table[hirq];
+}
+
static void pch_pic_bitset(struct pch_pic *priv, int offset, int bit)
{
u32 reg;
@@ -80,45 +87,47 @@ static void pch_pic_mask_irq(struct irq_data *d)
{
struct pch_pic *priv = irq_data_get_irq_chip_data(d);
- pch_pic_bitset(priv, PCH_PIC_MASK, d->hwirq);
+ pch_pic_bitset(priv, PCH_PIC_MASK, hwirq_to_bit(priv, d->hwirq));
irq_chip_mask_parent(d);
}
static void pch_pic_unmask_irq(struct irq_data *d)
{
struct pch_pic *priv = irq_data_get_irq_chip_data(d);
+ int bit = hwirq_to_bit(priv, d->hwirq);
- writel(BIT(PIC_REG_BIT(d->hwirq)),
- priv->base + PCH_PIC_CLR + PIC_REG_IDX(d->hwirq) * 4);
+ writel(BIT(PIC_REG_BIT(bit)),
+ priv->base + PCH_PIC_CLR + PIC_REG_IDX(bit) * 4);
irq_chip_unmask_parent(d);
- pch_pic_bitclr(priv, PCH_PIC_MASK, d->hwirq);
+ pch_pic_bitclr(priv, PCH_PIC_MASK, bit);
}
static int pch_pic_set_type(struct irq_data *d, unsigned int type)
{
struct pch_pic *priv = irq_data_get_irq_chip_data(d);
+ int bit = hwirq_to_bit(priv, d->hwirq);
int ret = 0;
switch (type) {
case IRQ_TYPE_EDGE_RISING:
- pch_pic_bitset(priv, PCH_PIC_EDGE, d->hwirq);
- pch_pic_bitclr(priv, PCH_PIC_POL, d->hwirq);
+ pch_pic_bitset(priv, PCH_PIC_EDGE, bit);
+ pch_pic_bitclr(priv, PCH_PIC_POL, bit);
irq_set_handler_locked(d, handle_edge_irq);
break;
case IRQ_TYPE_EDGE_FALLING:
- pch_pic_bitset(priv, PCH_PIC_EDGE, d->hwirq);
- pch_pic_bitset(priv, PCH_PIC_POL, d->hwirq);
+ pch_pic_bitset(priv, PCH_PIC_EDGE, bit);
+ pch_pic_bitset(priv, PCH_PIC_POL, bit);
irq_set_handler_locked(d, handle_edge_irq);
break;
case IRQ_TYPE_LEVEL_HIGH:
- pch_pic_bitclr(priv, PCH_PIC_EDGE, d->hwirq);
- pch_pic_bitclr(priv, PCH_PIC_POL, d->hwirq);
+ pch_pic_bitclr(priv, PCH_PIC_EDGE, bit);
+ pch_pic_bitclr(priv, PCH_PIC_POL, bit);
irq_set_handler_locked(d, handle_level_irq);
break;
case IRQ_TYPE_LEVEL_LOW:
- pch_pic_bitclr(priv, PCH_PIC_EDGE, d->hwirq);
- pch_pic_bitset(priv, PCH_PIC_POL, d->hwirq);
+ pch_pic_bitclr(priv, PCH_PIC_EDGE, bit);
+ pch_pic_bitset(priv, PCH_PIC_POL, bit);
irq_set_handler_locked(d, handle_level_irq);
break;
default:
@@ -133,11 +142,12 @@ static void pch_pic_ack_irq(struct irq_data *d)
{
unsigned int reg;
struct pch_pic *priv = irq_data_get_irq_chip_data(d);
+ int bit = hwirq_to_bit(priv, d->hwirq);
- reg = readl(priv->base + PCH_PIC_EDGE + PIC_REG_IDX(d->hwirq) * 4);
- if (reg & BIT(PIC_REG_BIT(d->hwirq))) {
- writel(BIT(PIC_REG_BIT(d->hwirq)),
- priv->base + PCH_PIC_CLR + PIC_REG_IDX(d->hwirq) * 4);
+ reg = readl(priv->base + PCH_PIC_EDGE + PIC_REG_IDX(bit) * 4);
+ if (reg & BIT(PIC_REG_BIT(bit))) {
+ writel(BIT(PIC_REG_BIT(bit)),
+ priv->base + PCH_PIC_CLR + PIC_REG_IDX(bit) * 4);
}
irq_chip_ack_parent(d);
}
@@ -159,6 +169,8 @@ static int pch_pic_domain_translate(struct irq_domain *d,
{
struct pch_pic *priv = d->host_data;
struct device_node *of_node = to_of_node(fwspec->fwnode);
+ unsigned long flags;
+ int i;
if (of_node) {
if (fwspec->param_count < 2)
@@ -171,6 +183,27 @@ static int pch_pic_domain_translate(struct irq_domain *d,
return -EINVAL;
*hwirq = fwspec->param[0] - priv->gsi_base;
+
+ raw_spin_lock_irqsave(&priv->pic_lock, flags);
+ /* Check pic-table to confirm if the hwirq has been assigned */
+ for (i = 0; i < priv->inuse; i++) {
+ if (priv->table[i] == *hwirq) {
+ *hwirq = i;
+ break;
+ }
+ }
+ if (i == priv->inuse) {
+ /* Assign a new hwirq in pic-table */
+ if (priv->inuse >= PIC_COUNT) {
+ pr_err("pch-pic domain has no free vectors\n");
+ raw_spin_unlock_irqrestore(&priv->pic_lock, flags);
+ return -EINVAL;
+ }
+ priv->table[priv->inuse] = *hwirq;
+ *hwirq = priv->inuse++;
+ }
+ raw_spin_unlock_irqrestore(&priv->pic_lock, flags);
+
The patch fails the test on LS2K2000+FDT and does not boot the system
properly.
The reason the test fails is that this part of the priv->table[]
initialization is needed for FDT as well, so I think it needs to be put
after the whole judgment, at the end of the function.
Thanks.
Binbin
if (fwspec->param_count > 1)
*type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
else
@@ -194,6 +227,9 @@ static int pch_pic_alloc(struct irq_domain *domain, unsigned int virq,
if (err)
return err;
+ /* Write vector ID */
+ writeb(priv->ht_vec_base + hwirq, priv->base + PCH_INT_HTVEC(hwirq_to_bit(priv, hwirq)));
+
parent_fwspec.fwnode = domain->parent->fwnode;
parent_fwspec.param_count = 1;
parent_fwspec.param[0] = hwirq + priv->ht_vec_base;
@@ -222,7 +258,7 @@ static void pch_pic_reset(struct pch_pic *priv)
for (i = 0; i < PIC_COUNT; i++) {
/* Write vector ID */
- writeb(priv->ht_vec_base + i, priv->base + PCH_INT_HTVEC(i));
+ writeb(priv->ht_vec_base + i, priv->base + PCH_INT_HTVEC(hwirq_to_bit(priv, i)));
/* Hardcode route to HT0 Lo */
writeb(1, priv->base + PCH_INT_ROUTE(i));
}
@@ -284,6 +320,7 @@ static int pch_pic_init(phys_addr_t addr, unsigned long size, int vec_base,
u32 gsi_base)
{
struct pch_pic *priv;
+ int i;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -294,6 +331,10 @@ static int pch_pic_init(phys_addr_t addr, unsigned long size, int vec_base,
if (!priv->base)
goto free_priv;
+ priv->inuse = 0;
+ for (i = 0; i < PIC_COUNT; i++)
+ priv->table[i] = PIC_UNDEF_VECTOR;
+
priv->ht_vec_base = vec_base;
priv->vec_count = ((readq(priv->base) >> 48) & 0xff) + 1;
priv->gsi_base = gsi_base;