On Fri, Feb 28, 2025 at 12:28:21AM +0800, Hans Zhang wrote:
> Add to view the addresses and data stored in the MSI capability or the
> addresses and data stored in the MSIX vector table.
>
> e.g.
> root@root:/sys/bus/pci/devices/<dev>/msi_irqs# ls
> 86 87 88 89
> root@root:/sys/bus/pci/devices/<dev>/msi_irqs# cat *
> msix
> address_hi: 0x00000000
> address_lo: 0x0e060040
> msg_data: 0x00000000
> msix
> address_hi: 0x00000000
> address_lo: 0x0e060040
> msg_data: 0x00000001
> msix
> address_hi: 0x00000000
> address_lo: 0x0e060040
> msg_data: 0x00000002
> msix
> address_hi: 0x00000000
> address_lo: 0x0e060040
> msg_data: 0x00000003
>
> Signed-off-by: Hans Zhang <18255117159@xxxxxxx>
> ---
> kernel/irq/msi.c | 12 +++++++++++-
> 1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
> index 396a067a8a56..a37a3e535fb8 100644
> --- a/kernel/irq/msi.c
> +++ b/kernel/irq/msi.c
> @@ -503,8 +503,18 @@ static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr,
> {
> /* MSI vs. MSIX is per device not per interrupt */
> bool is_msix = dev_is_pci(dev) ? to_pci_dev(dev)->msix_enabled : false;
> + struct msi_desc *desc;
> + u32 irq;
> +
> + if (kstrtoint(attr->attr.name, 10, &irq) < 0)
> + return 0;
>
> - return sysfs_emit(buf, "%s\n", is_msix ? "msix" : "msi");
> + desc = irq_get_msi_desc(irq);
> + return sysfs_emit(
> + buf,
> + "%s\n address_hi: 0x%08x\n address_lo: 0x%08x\n msg_data: 0x%08x\n",
> + is_msix ? "msix" : "msi", desc->msg.address_hi,
> + desc->msg.address_lo, desc->msg.data);
Sysfs is an ABI. You cannot change the semantics of an attribute.
- Mani
--
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