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Enable MSI-X support in PCIe device.
From: |
Douglas Su |
Subject: |
Enable MSI-X support in PCIe device. |
Date: |
Fri, 23 Oct 2020 03:32:56 +0000 |
To use MSI-X interrupt in my PCIe device, In realize() function I make a MSIX
initialization like this:
#define MYDEV_MSIX_VEC_NUM 5
void realize() {
memory_region_init(&mydev->msix, OBJECT(edu), "mydev-msix",
MYDEV_MSIX_SIZE);
pci_register_bar(pdev, MYDEV_MSIX_IDX,
PCI_BASE_ADDRESS_SPACE_MEMORY, &mydev->msix);
rv = msix_init(pdev, MYDEV_MSIX_VEC_NUM,
&edu->msix, MYDEV_MSIX_IDX, MYDEV_MSIX_TABLE,
&edu->msix, MYDEV_MSIX_IDX, MYDEV_MSIX_PBA,
0, errp);
}
After this, a simple logic is added to trigger interrupt by writing command to
a specific BAR0 address.
void trigger() {
msix_notify(pdev, 1); // send vector 1 to msix
}
In the OS driver, MSIX is enabled via `pci_alloc_irq_vectors()`, which is
detailed in Linux Kernel's documentation `Documentation/PCI/msi-howto.rst` (I
use kernel 5.7).
It is correct to obtain the number of vector from that function but failed to
receive interrupt from device. The IRQ, which is returned from
`pci_irq_vector`, is registered via `request_irq()` in the deriver.
Can anyone give a clue?
- Enable MSI-X support in PCIe device.,
Douglas Su <=