On 12/04/2017 11:59, Marc Zyngier wrote:
> And that's *wrong*. I've repeatedly said that you only need to deal with
> *your* irqchip. End of story. Nowhere else. Please leave the MSI irqchip
> alone, it is very unlikely that you have to provide anything at all to it.
Hello Marc,
I am hoping you can help me pinpoint what's missing in my code,
to have it behave the way you describe.
As you have stated, I have *two* struct irq_chip:
one is mine (tango_chip), the other not_mine (msi_chip).
static struct irq_chip tango_chip = {
.name = "TANGO IRQ_CHIP",
.irq_compose_msi_msg = tango_compose_msi_msg,
.irq_set_affinity = tango_set_affinity,
.irq_ack = tango_ack,
.irq_mask = tango_mask,
.irq_unmask = tango_unmask,
};
static struct irq_chip msi_chip = {
.name = "NOT MY IRQ_CHIP",
.irq_ack = not_mine_ack,
.irq_mask = not_mine_mask,
.irq_unmask = not_mine_unmask,
};
A struct msi_domain_info links to the msi_chip.
static struct msi_domain_info msi_dom_info = {
.flags = MSI_FLAG_PCI_MSIX | MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS,
.chip = &msi_chip,
};
irq_dom = irq_domain_create_linear(fwnode, MSI_COUNT, &irq_dom_ops, pcie);
msi_dom = pci_msi_create_irq_domain(fwnode, &msi_dom_info, irq_dom);
I believe irq_dom and tango_chip are tied together by:
irq_domain_set_info(dom, virq, pos, &tango_chip, pcie, handle_edge_irq, NULL, NULL);
My biggest problem is that tango_unmask() is never called.
Here is the log of function calls as they happen on my system:
[ 0.361586] TANGO irq_chip=c0d10a00 MSI irq_chip=c0d10aa8
[ 0.361595] IRQ_DOM=cf9db300 MSI_DOM=cf9b5080
[ 0.363214] find_free_msi: dom=cf9db300 virq=30 hwirq=0 chip=c0d10a00 cdata=cfb0a410
[ 0.363314] [<c0316e54>] (tango_irq_domain_alloc) from [<c0163468>] (msi_domain_alloc+0x68/0x128)
[ 0.363543] ENTER tango_compose_msi_msg
[ 0.363552] TANGO IRQ_CHIP: irq_data=cfaf4180 irq=30 hwirq=0 chip=c0d10a00 dom=cf9db300 pdata= (null) cdata=cfb0a410
[ 0.363609] [<c0316ca4>] (tango_compose_msi_msg) from [<c015f654>] (irq_chip_compose_msi_msg+0x48/0x58)
[ 0.363928] ENTER not_mine_unmask
[ 0.363943] NOT MY IRQ_CHIP: irq_data=cf940110 irq=30 hwirq=0 chip=c0d10aa8 dom=cf9b5080 pdata=cfaf4180 cdata= (null)
[ 0.364012] [<c0316c48>] (not_mine_unmask) from [<c015edc0>] (irq_enable+0x30/0x44)
[ 2.475111] find_free_msi: dom=cf9db300 virq=34 hwirq=1 chip=c0d10a00 cdata=cfb0a410
[ 2.516895] [<c0316e54>] (tango_irq_domain_alloc) from [<c0163468>] (msi_domain_alloc+0x68/0x128)
[ 2.686593] find_free_msi: dom=cf9db300 virq=35 hwirq=2 chip=c0d10a00 cdata=cfb0a410
[ 2.728334] [<c0316e54>] (tango_irq_domain_alloc) from [<c0163468>] (msi_domain_alloc+0x68/0x128)
[ 2.897946] find_free_msi: dom=cf9db300 virq=36 hwirq=3 chip=c0d10a00 cdata=cfb0a410
[ 2.939680] [<c0316e54>] (tango_irq_domain_alloc) from [<c0163468>] (msi_domain_alloc+0x68/0x128)
[ 3.109254] ENTER tango_compose_msi_msg
[ 3.114603] TANGO IRQ_CHIP: irq_data=cfb4b500 irq=34 hwirq=1 chip=c0d10a00 dom=cf9db300 pdata= (null) cdata=cfb0a410
[ 3.160621] [<c0316ca4>] (tango_compose_msi_msg) from [<c015f654>] (irq_chip_compose_msi_msg+0x48/0x58)
[ 3.340161] ENTER tango_compose_msi_msg
[ 3.345507] TANGO IRQ_CHIP: irq_data=cfb4b440 irq=35 hwirq=2 chip=c0d10a00 dom=cf9db300 pdata= (null) cdata=cfb0a410
[ 3.391522] [<c0316ca4>] (tango_compose_msi_msg) from [<c015f654>] (irq_chip_compose_msi_msg+0x48/0x58)
[ 3.571148] ENTER tango_compose_msi_msg
[ 3.576503] TANGO IRQ_CHIP: irq_data=cfb4b380 irq=36 hwirq=3 chip=c0d10a00 dom=cf9db300 pdata= (null) cdata=cfb0a410
[ 3.631966] [<c015f654>] (irq_chip_compose_msi_msg) from [<c016362c>] (msi_domain_activate+0x18/0x40)
[ 3.802121] ENTER not_mine_unmask
[ 3.806937] NOT MY IRQ_CHIP: irq_data=cf95c210 irq=34 hwirq=524288 chip=c0d10aa8 dom=cf9b5080 pdata=cfb4b500 cdata= (null)
[ 3.852943] [<c0316c48>] (not_mine_unmask) from [<c015edc0>] (irq_enable+0x30/0x44)
[ 3.998596] ENTER not_mine_unmask
[ 4.003410] NOT MY IRQ_CHIP: irq_data=cf95c010 irq=35 hwirq=524289 chip=c0d10aa8 dom=cf9b5080 pdata=cfb4b440 cdata= (null)
[ 4.049415] [<c0316c48>] (not_mine_unmask) from [<c015edc0>] (irq_enable+0x30/0x44)
[ 4.195055] ENTER not_mine_unmask
[ 4.199870] NOT MY IRQ_CHIP: irq_data=cf97cf10 irq=36 hwirq=524290 chip=c0d10aa8 dom=cf9b5080 pdata=cfb4b380 cdata= (null)
[ 4.245874] [<c0316c48>] (not_mine_unmask) from [<c015edc0>] (irq_enable+0x30/0x44)
It's driving me nuts. Do you know what might be wrong?
Regards.
