Hi,
On Thu, Dec 21, 2023 at 10:00:26PM +0530, Vinod Koul wrote:
>
> On Tue, 19 Dec 2023 14:50:26 +0900, Bumyong Lee wrote:
> > According to DMA-330 errata notice[1] 71930, DMAKILL
> > cannot clear internal signal, named pipeline_req_active.
> > it makes that pl330 would wait forever in WFP state
> > although dma already send dma request if pl330 gets
> > dma request before entering WFP state.
> >
> > The errata suggests that polling until entering WFP state
> > as workaround and then peripherals allows to issue dma request.
> >
> > [...]
>
> Applied, thanks!
>
> [1/1] dmaengine: pl330: issue_pending waits until WFP state
> commit: d114d3a096194fb2a9c3bedd7be6587b97610625
This seems to cause a stall on my Quartz 64 model B (RK3566) once
Bluetooth over UART is initialized, when combined with a patch of mine
that enables DMA on UARTs [1]. Reverting this patch gets everything
running again.
The following are RCU stalls detected, followed by stack traces
produced with pseudo-NMI. Without pseudo-NMIs no stack traces are
produced.
rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
rcu: 0-...0: (0 ticks this GP) idle=80fc/1/0x4000000000000000 softirq=693/693 fqs=31498
rcu: 3-...0: (3 ticks this GP) idle=2b44/1/0x4000000000000000 softirq=553/556 fqs=31498
rcu: (detected by 1, t=162830 jiffies, g=-307, q=32 ncpus=4)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 1200 Comm: (udev-worker) Not tainted 6.7.0-rc6-next-20231222-10300-g8b07e3811bc7 #17
Hardware name: Pine64 RK3566 Quartz64-B Board (DT)
pstate: 00400009 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : queued_spin_lock_slowpath+0x50/0x330
lr : pl330_irq_handler+0x2f8/0x5a0
sp : ffffffc080003ec0
pmr_save: 00000060
x29: ffffffc080003ec0 x28: ffffff80017c7000 x27: ffffff8001a58d80
x26: 0000000000000060 x25: ffffff80017d0338 x24: ffffff800161ae38
x23: ffffff8001597c00 x22: ffffffc081960000 x21: 0000000000000000
x20: ffffff800161ac80 x19: ffffff80010c5180 x18: 0000000000000000
x17: ffffffc06e724000 x16: ffffffc080000000 x15: 0000000000000000
x14: 0000000000000000 x13: ffffff80042f102f x12: ffffffc083ad3cc4
x11: 0000000000000040 x10: ffffff800022a0a8 x9 : ffffff800022a0a0
x8 : ffffff8000400270 x7 : 0000000000000000 x6 : 0000000000000000
x5 : ffffff8000400248 x4 : ffffffc06e724000 x3 : ffffffc080003fa0
x2 : 0000000000000000 x1 : 0000000000000001 x0 : ffffff800161ae38
Call trace:
queued_spin_lock_slowpath+0x50/0x330
__handle_irq_event_percpu+0x38/0x16c
handle_irq_event+0x44/0xf8
handle_fasteoi_irq+0xb0/0x28c
generic_handle_domain_irq+0x2c/0x44
gic_handle_irq+0x10c/0x240
call_on_irq_stack+0x24/0x4c
do_interrupt_handler+0x80/0x8c
el1_interrupt+0x44/0x98
el1h_64_irq_handler+0x18/0x24
el1h_64_irq+0x78/0x7c
__d_rehash+0x0/0x94
d_add+0x40/0x80
simple_lookup+0x4c/0x78
path_openat+0x5ec/0xed0
do_filp_open+0x80/0x12c
do_sys_openat2+0xb4/0xe8
__arm64_sys_openat+0x64/0xa4
invoke_syscall+0x48/0x114
el0_svc_common.constprop.0+0x40/0xe0
do_el0_svc+0x1c/0x28
el0_svc+0x34/0xd4
el0t_64_sync_handler+0x100/0x12c
el0t_64_sync+0x1a4/0x1a8
Sending NMI from CPU 1 to CPUs 3:
NMI backtrace for cpu 3
CPU: 3 PID: 31 Comm: kworker/3:0 Not tainted 6.7.0-rc6-next-20231222-10300-g8b07e3811bc7 #17
Hardware name: Pine64 RK3566 Quartz64-B Board (DT)
Workqueue: events hci_uart_write_work [hci_uart]
pstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : _state+0x2c/0x138
lr : pl330_start_thread.isra.0+0x2e0/0x32c
sp : ffffffc08157bb20
pmr_save: 00000060
x29: ffffffc08157bb20 x28: 0000000000000000 x27: 0000000000000060
x26: ffffffc080c4e658 x25: 0000000000000060 x24: 0000000001a20000
x23: ffffff8001555000 x22: ffffffc081960020 x21: ffffff800161b068
x20: 0000000000000000 x19: ffffff800161b050 x18: ffffffffffffffff
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000001
x14: 0000000000000004 x13: 0000000000000009 x12: 0000000000000005
x11: 0000000000000027 x10: 000000000000002b x9 : 0000000000000032
x8 : ffffffc08154521d x7 : 0000000000000005 x6 : 0000000000000010
x5 : 0000000000000001 x4 : ffffffc081960d04 x3 : ffffff800161b280
x2 : ffffff800161b050 x1 : 0000000000204000 x0 : 0000000000000108
Call trace:
_state+0x2c/0x138
pl330_tasklet+0x1f8/0x818
pl330_issue_pending+0x150/0x178
serial8250_tx_dma+0x150/0x21c
serial8250_start_tx+0x9c/0x1c0
__uart_start+0x74/0xfc
uart_write+0xfc/0x2f0
ttyport_write_buf+0x4c/0x90
serdev_device_write_buf+0x24/0x38
hci_uart_write_work+0x54/0x164 [hci_uart]
process_one_work+0x13c/0x2bc
worker_thread+0x2a0/0x52c
kthread+0xe0/0xe4
ret_from_fork+0x10/0x20
[1] https://lore.kernel.org/linux-arm-kernel/20221106161443.4104-1-wens@xxxxxxxxxx/
