I have sent the question too early.
Let me give more details:
I use uio_pci_generic, and it catch the interrupts, but does not
deliver them to userspace:
/* Interrupt handler. Read/modify/write the command register to disable
* the interrupt. */
static irqreturn_t irqhandler(int irq, struct uio_info *info)
{
struct uio_pci_generic_dev *gdev = to_uio_pci_generic_dev(info);
<<--- interrupt is catched here
if (!pci_check_and_mask_intx(gdev->pdev))
return IRQ_NONE;
<<--- But we never get here
/* UIO core will signal the user process. */
return IRQ_HANDLED;
}
Is there any reason why pci_check_and_mask_intx fails ?
Thanks
On Thu, Nov 21, 2019 at 6:04 PM Ranran <ranshalit@xxxxxxxxx> wrote:
>
> it's been sent too soon , sorry.
> kernel version:
> 86_64 x86_64 GNU/Linux
> [root@localhost devmem2]# uname -a
> Linux localhost.localdomain 4.18.16 #4 SMP Thu Nov 21 17:10:34 IST
> 2019 x86_64 x86_64 x86_64 GNU/Linux
> [root@localhost devmem2]#
>
> Thank you for any ideas,
> Ran
>
> On Thu, Nov 21, 2019 at 6:02 PM Ranran <ranshalit@xxxxxxxxx> wrote:
> >
> > Hello,
> >
> > I use FPGA with PCIe, and we try to simulate interrupt.
> > uio_generic_pci is the kernel pci driver.
> >
> > On receiving interrupt there is a crash:
> >
> > I get the following exception:
> > What do you want to do today ? [ 384.696015] irq 23: nobody cared
> > (try booting with the "irqpoll" option)
> > [ 384.703048] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G OE
> > 4.18.16 #3
> > [ 384.710799] Hardware name: /conga-MA5, BIOS MA50R000 10/30/2019
> > [ 384.717083] Call Trace:
> > [ 384.719643] <IRQ>
> > [ 384.721761] dump_stack+0x5c/0x80
> > [ 384.725224] __report_bad_irq+0x35/0xaf
> > [ 384.729234] note_interrupt.cold.9+0xa/0x63
> > [ 384.733612] handle_irq_event_percpu+0x68/0x70
> > [ 384.738239] handle_irq_event+0x37/0x57
> > [ 384.742262] handle_fasteoi_irq+0x97/0x150
> > [ 384.746560] handle_irq+0x1a/0x30
> > [ 384.750021] do_IRQ+0x44/0xd0
> > [ 384.753132] common_interrupt+0xf/0xf
> > [ 384.756979] </IRQ>
> > [ 384.759181] RIP: 0010:cpuidle_enter_state+0x7d/0x220
> > [ 384.764368] Code: e8 d8 19 45 00 41 89 c4 e8 30 50 b1 ff 65 8b 3d
> > 99 db 85 7e e8 a4 4e b1 ff 31 ff 48 89 c3 e8 4a 61 b1 ff fb 66 0f 1f
> > 44 00 00 <48> b8 ff ff ff ff f3 01 00 00 4c 29 eb ba ff ff ff 7f 48 89
> > d9 48
> > [ 384.784119] RSP: 0018:ffffb068c06afea8 EFLAGS: 00000286 ORIG_RAX:
> > ffffffffffffffda
> > [ 384.792032] RAX: ffff96977fca14c0 RBX: 0000005991ab33dd RCX: 000000000000001f
> > [ 384.799495] RDX: 0000005991ab33dd RSI: 0000000000000000 RDI: 0000000000000000
> > [ 384.806955] RBP: ffff96977fcab300 R08: 000000977b372895 R09: 0000000000000006
> > [ 384.814446] R10: 00000000ffffffff R11: ffff96977fca05a8 R12: 0000000000000001
> > [ 384.821900] R13: 0000005991ab220e R14: 0000000000000001 R15: 0000000000000000
> > [ 384.829346] ? cpuidle_enter_state+0x76/0x220
> > [ 384.833886] do_idle+0x221/0x260
> > [ 384.837258] cpu_startup_entry+0x6a/0x70
> > [ 384.841366] start_secondary+0x1a4/0x1f0
> > [ 384.845465] secondary_startup_64+0xb7/0xc0
> > [ 384.849849] handlers:
> > [ 384.852233] [<000000007a5bed83>] uio_interrupt
> > [ 384.856892] Disabling IRQ #23
> >
> > kernel version:
