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lib: sbi_irqchip: Add support for registering MSI handlers

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Some of the drivers (such as APLIC) require capability to registers
MSI handlers from the parent interrupt controller (such as IMSIC)
so add sbi_irqchip_register_msi_handler() for this purpose.

Link: https://lore.kernel.org/r/20260423052339.356900-7-anup.patel@oss.qualcomm.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Anup Patel
2026-04-23 10:53:39 +05:30
committed by Anup Patel
parent c0d0dd02b1
commit 79e63bc834
2 changed files with 88 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/sbi/sbi_irqchip.h
+19
View File
@@ -16,6 +16,13 @@
struct sbi_scratch;
/** irqchip message signalled interrupt (MSI) */
struct sbi_irqchip_msi_msg {
u32 address_lo;
u32 address_hi;
u32 data;
};
/** irqchip hardware device */
struct sbi_irqchip_device {
/** Node in the list of irqchip devices (private) */
@@ -109,6 +116,18 @@ int sbi_irqchip_get_affinity(struct sbi_irqchip_device *chip, u32 hwirq,
/** Set hardware interrupt affinity */
int sbi_irqchip_set_affinity(struct sbi_irqchip_device *chip, u32 hwirq, u32 hart_index);
/** Write MSI message to the hardware interrupt handler */
int sbi_irqchip_write_msi(struct sbi_irqchip_device *chip, u32 hwirq,
const struct sbi_irqchip_msi_msg *msg);
/** Register a hardware MSI handler */
int sbi_irqchip_register_msi(struct sbi_irqchip_device *chip, u32 num_hwirq,
void (*write_msi)(u32 hwirq,
const struct sbi_irqchip_msi_msg *msg,
void *priv),
int (*callback)(u32 hwirq, void *priv), void *priv,
u32 *out_first_hwirq);
/** Register a hardware interrupt handler */
int sbi_irqchip_register_handler(struct sbi_irqchip_device *chip,
u32 first_hwirq, u32 num_hwirq, u32 hwirq_flags,
lib/sbi/sbi_irqchip.c
+69 -2
View File
@@ -35,6 +35,9 @@ struct sbi_irqchip_handler {
/** Number of consecutive hardware IRQs handled by this handler */
u32 num_hwirq;
/** Write MSI function of this handler */
void (*write_msi)(u32 hwirq, const struct sbi_irqchip_msi_msg *msg, void *priv);
/** Callback function of this handler */
int (*callback)(u32 hwirq, void *priv);
@@ -141,6 +144,24 @@ int sbi_irqchip_set_raw_handler(struct sbi_irqchip_device *chip, u32 hwirq,
return 0;
}
int sbi_irqchip_write_msi(struct sbi_irqchip_device *chip, u32 hwirq,
const struct sbi_irqchip_msi_msg *msg)
{
struct sbi_irqchip_handler *h;
if (!chip || chip->num_hwirq <= hwirq || !msg)
return SBI_EINVAL;
h = sbi_irqchip_find_handler(chip, hwirq);
if (!h)
return SBI_EFAIL;
if (!h->write_msi)
return SBI_ENOTSUPP;
h->write_msi(hwirq, msg, h->priv);
return 0;
}
int sbi_irqchip_get_affinity(struct sbi_irqchip_device *chip, u32 hwirq,
u32 *out_hart_index)
{
@@ -215,6 +236,9 @@ static int __sbi_irqchip_handler_set_affinity(struct sbi_irqchip_device *chip,
static int __sbi_irqchip_register_handler(struct sbi_irqchip_device *chip,
u32 first_hwirq, u32 num_hwirq, u32 hwirq_flags,
void (*write_msi)(u32 hwirq,
const struct sbi_irqchip_msi_msg *msg,
void *priv),
int (*callback)(u32 hwirq, void *priv), void *priv)
{
struct sbi_irqchip_handler *h, *th, *nh;
@@ -232,6 +256,7 @@ static int __sbi_irqchip_register_handler(struct sbi_irqchip_device *chip,
return SBI_ENOMEM;
h->first_hwirq = first_hwirq;
h->num_hwirq = num_hwirq;
h->write_msi = write_msi;
h->callback = callback;
h->priv = priv;
@@ -281,6 +306,48 @@ static int __sbi_irqchip_register_handler(struct sbi_irqchip_device *chip,
return 0;
}
int sbi_irqchip_register_msi(struct sbi_irqchip_device *chip, u32 num_hwirq,
void (*write_msi)(u32 hwirq,
const struct sbi_irqchip_msi_msg *msg,
void *priv),
int (*callback)(u32 hwirq, void *priv), void *priv,
u32 *out_first_hwirq)
{
struct sbi_irqchip_handler *h;
bool found;
u32 hwirq;
if (!chip || !chip->hwirq_set_affinity || !num_hwirq ||
!write_msi || !callback || !out_first_hwirq)
return SBI_EINVAL;
if (chip->num_hwirq < num_hwirq)
return SBI_EBAD_RANGE;
hwirq = 0;
found = false;
sbi_list_for_each_entry(h, &chip->handler_list, node) {
if (h->first_hwirq <= hwirq && hwirq < (h->first_hwirq + h->num_hwirq)) {
hwirq = h->first_hwirq + h->num_hwirq;
} else if (hwirq < h->first_hwirq) {
if (h->first_hwirq - hwirq < num_hwirq) {
found = true;
break;
} else {
hwirq = h->first_hwirq + h->num_hwirq;
}
}
}
if (!found && !hwirq)
found = true;
if (!found)
return SBI_ENOSPC;
*out_first_hwirq = hwirq;
return __sbi_irqchip_register_handler(chip, *out_first_hwirq,
num_hwirq, SBI_HWIRQ_FLAGS_NONE,
write_msi, callback, priv);
}
int sbi_irqchip_register_handler(struct sbi_irqchip_device *chip,
u32 first_hwirq, u32 num_hwirq, u32 hwirq_flags,
int (*callback)(u32 hwirq, void *priv), void *priv)
@@ -292,7 +359,7 @@ int sbi_irqchip_register_handler(struct sbi_irqchip_device *chip,
return SBI_EBAD_RANGE;
return __sbi_irqchip_register_handler(chip, first_hwirq, num_hwirq, hwirq_flags,
callback, priv);
NULL, callback, priv);
}
int sbi_irqchip_register_reserved(struct sbi_irqchip_device *chip,
@@ -305,7 +372,7 @@ int sbi_irqchip_register_reserved(struct sbi_irqchip_device *chip,
return SBI_EBAD_RANGE;
return __sbi_irqchip_register_handler(chip, first_hwirq, num_hwirq,
SBI_HWIRQ_FLAGS_NONE, NULL, NULL);
SBI_HWIRQ_FLAGS_NONE, NULL, NULL, NULL);
}
int sbi_irqchip_unregister_handler(struct sbi_irqchip_device *chip,