Re: [PATCH 0/9] Linux RISC-V AIA Support

Atish Patra
2022-11-11T19:01:48Z

On Fri, Nov 11, 2022 at 1:13 AM Atish Patra <atishp@atishpatra.org> wrote:
>
> On Fri, Nov 11, 2022 at 1:07 AM Atish Patra <atishp@atishpatra.org> wrote:
> >
> > On Thu, Nov 10, 2022 at 8:42 PM Anup Patel <apatel@ventanamicro.com> wrote:
> > >
> > > The RISC-V AIA specification is now frozen as-per the RISC-V international
> > > process. The latest frozen specifcation can be found at:
> > > https://github.com/riscv/riscv-aia/releases/download/1.0-RC1/riscv-interrupts-1.0-RC1.pdf
> > >
> > > At a high-level, the AIA specification adds three things:
> > > 1) AIA CSRs
> > > - Improved local interrupt support
> > > 2) Incoming Message Signaled Interrupt Controller (IMSIC)
> > > - Per-HART MSI controller
> > > - Support MSI virtualization
> > > - Support IPI along with virtualization
> > > 3) Advanced Platform-Level Interrupt Controller (APLIC)
> > > - Wired interrupt controller
> > > - In MSI-mode, converts wired interrupt into MSIs (i.e. MSI generator)
> > > - In Direct-mode, injects external interrupts directly into HARTs
> > >
> > > For an overview of the AIA specification, refer the recent AIA virtualization
> > > talk at KVM Forum 2022:
> > > https://static.sched.com/hosted_files/kvmforum2022/a1/AIA_Virtualization_in_KVM_RISCV_final.pdf
> > > https://www.youtube.com/watch?v=r071dL8Z0yo
> > >
> > > This series adds required Linux irqchip drivers for AIA and it depends on
> > > the recent "RISC-V IPI Improvements".
> > > (Refer, https://lore.kernel.org/lkml/20221101143400.690000-1-apatel@ventanamicro.com/t/)
> > >
> > > To test this series, use QEMU v7.1 (or higher) and OpenSBI v1.1 (or higher).
> > >
> > > These patches can also be found in the riscv_aia_v1 branch at:
> > > https://github.com/avpatel/linux.git
> > >
> > > Anup Patel (9):
> > > RISC-V: Add AIA related CSR defines
> > > RISC-V: Detect AIA CSRs from ISA string
> > > irqchip/riscv-intc: Add support for RISC-V AIA
> > > dt-bindings: Add RISC-V incoming MSI controller bindings
> > > irqchip: Add RISC-V incoming MSI controller driver
> > > dt-bindings: Add RISC-V advanced PLIC bindings
> > > irqchip: Add RISC-V advanced PLIC driver
> > > RISC-V: Select APLIC and IMSIC drivers for QEMU virt machine
> > > MAINTAINERS: Add entry for RISC-V AIA drivers
> > >
> > > .../interrupt-controller/riscv,aplic.yaml | 136 ++
> > > .../interrupt-controller/riscv,imsic.yaml | 174 +++
> > > MAINTAINERS | 12 +
> > > arch/riscv/Kconfig.socs | 2 +
> > > arch/riscv/include/asm/csr.h | 92 ++
> > > arch/riscv/include/asm/hwcap.h | 8 +
> > > arch/riscv/kernel/cpu.c | 2 +
> > > arch/riscv/kernel/cpufeature.c | 2 +
> > > drivers/irqchip/Kconfig | 32 +-
> > > drivers/irqchip/Makefile | 2 +
> > > drivers/irqchip/irq-riscv-aplic.c | 656 +++++++++
> > > drivers/irqchip/irq-riscv-imsic.c | 1207 +++++++++++++++++
> > > drivers/irqchip/irq-riscv-intc.c | 37 +-
> > > include/linux/irqchip/riscv-aplic.h | 117 ++
> > > include/linux/irqchip/riscv-imsic.h | 92 ++
> > > 15 files changed, 2564 insertions(+), 7 deletions(-)
> > > create mode 100644 Documentation/devicetree/bindings/interrupt-controller/riscv,aplic.yaml
> > > create mode 100644 Documentation/devicetree/bindings/interrupt-controller/riscv,imsic.yaml
> > > create mode 100644 drivers/irqchip/irq-riscv-aplic.c
> > > create mode 100644 drivers/irqchip/irq-riscv-imsic.c
> > > create mode 100644 include/linux/irqchip/riscv-aplic.h
> > > create mode 100644 include/linux/irqchip/riscv-imsic.h
> > >
> > > --
> > > 2.34.1
> > >
> >
> > I am seeing the following boot failure with your branch and upstream
> > qemu (tag: v7.2.0-rc0).
> > It seems IPIs are probably not getting delivered after a point. I saw
> > that IPIs are delivered in the same path earlier (via gdb).
> >
> > [ 0.990152] NET: Registered PF_INET6 protocol family
> > [ 1.004885] Segment Routing with IPv6
> > [ 1.005385] In-situ OAM (IOAM) with IPv6
> > [ 1.006371] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
> > [ 1.011609] NET: Registered PF_PACKET protocol family
> > [ 1.014877] 9pnet: Installing 9P2000 support
> > [ 1.015603] Key type dns_resolver registered
> > [ 1.026396] debug_vm_pgtable: [debug_vm_pgtable ]:
> > Validating architecture page table helpers
> > [ 1.144097] EXT4-fs (vda2): recovery complete
> > [ 1.146345] EXT4-fs (vda2): mounted filesystem with ordered data
> > mode. Quota mode: disabled.
> > [ 1.147020] VFS: Mounted root (ext4 filesystem) on device 254:2.
> > [ 1.152238] devtmpfs: mounted
> > [ 1.183914] Freeing unused kernel image (initmem) memory: 2176K
> > [ 1.185898] Run /sbin/init as init process
> > [ 29.412287] rcu: INFO: rcu_sched self-detected stall on CPU
> > [ 29.412992] rcu: 3-....: (5250 ticks this GP)
> > idle=fc3c/1/0x4000000000000002 softirq=78/78 fqs=2230
> > [ 29.413427] (t=5251 jiffies g=-1047 q=3 ncpus=8)
> > [ 29.414199] CPU: 3 PID: 1 Comm: init Not tainted
> > 6.1.0-rc4-00024-g5b711f2d7b91 #198
> > [ 29.414578] Hardware name: riscv-virtio,qemu (DT)
> > [ 29.414896] epc : smp_call_function_many_cond+0x138/0x372
> > [ 29.415157] ra : smp_call_function_many_cond+0x154/0x372
> > [ 29.415318] epc : ffffffff8008d2e6 ra : ffffffff8008d302 sp :
> > ff2000000004bb40
> > [ 29.415512] gp : ffffffff812e9eb0 tp : ff600000016d8000 t0 :
> > ff6000007ed88610
> > [ 29.415686] t1 : 00000000000000ff t2 : 0000000000000002 s0 :
> > ff2000000004bc00
> > [ 29.415837] s1 : ff6000007ed85448 a0 : 0000000000000007 a1 :
> > 00000000000000f7
> > [ 29.416008] a2 : 0000000000000000 a3 : 0000000000000000 a4 :
> > ff6000007edd1780
> > [ 29.416188] a5 : 0000000000000001 a6 : ffffffff812eb1c0 a7 :
> > ff600000016d8000
> > [ 29.416613] s2 : ffffffff81323c30 s3 : ffffffff812e9964 s4 :
> > 0000000000000000
> > [ 29.416810] s5 : 0000000000000000 s6 : ff6000007ed85440 s7 :
> > 0000000000000038
> > [ 29.416997] s8 : 0000000000000003 s9 : ffffffff81323c30 s10:
> > ff6000007ed85448
> > [ 29.417159] s11: 0000000000000008 t3 : 00ffffffad08a000 t4 :
> > ff60000001613e0c
> > [ 29.417331] t5 : 0000000000000000 t6 : 00ffffffad177fff
> > [ 29.417482] status: 0000000200000120 badaddr: 0000000000000000
> > cause: 8000000000000005
> > [ 29.417939] [<ffffffff8008d590>] on_each_cpu_cond_mask+0x20/0x32
> > [ 29.418179] [<ffffffff80008d32>] flush_icache_all+0x38/0x40
> > [ 29.418324] [<ffffffff80008eb2>] flush_icache_pte+0x4a/0x7a
> > [ 29.418442] [<ffffffff80139e00>] do_set_pte+0x132/0x192
> > [ 29.418594] [<ffffffff8010b42e>] filemap_map_pages+0x178/0x3a0
> > [ 29.418738] [<ffffffff8013ad00>] __handle_mm_fault+0x992/0xbac
> > [ 29.418876] [<ffffffff8013afde>] handle_mm_fault+0xc4/0x1d4
> > [ 29.419010] [<ffffffff80008372>] do_page_fault+0x120/0x326
> > [ 29.419145] [<ffffffff800033e6>] ret_from_exception+0x0/0xc
> >
> >
>
> Sorry. I forgot to mention that this happens while booting Fedora on
> an 8 cpu virt machine.
> I am yet to reproduce this issue for 4 or 2 cpus.
>

This warning splat appears with 4 cpus though.

[ 126.977213] e1000e 0000:00:02.0 enp0s2: NIC Link is Up 1000 Mbps
Full Duplex, Flow Control: Rx/Tx
[ 126.988275] IPv6: ADDRCONF(NETDEV_CHANGE): enp0s2: link becomes ready
[ 128.210090] ------------[ cut here ]------------
[ 128.210476] WARNING: CPU: 0 PID: 294 at
drivers/irqchip/irq-riscv-aplic.c:318 aplic_msi_write_msg+0x110/0x12a
[ 128.211702] Modules linked in:
[ 128.212473] CPU: 0 PID: 294 Comm: (agetty) Not tainted
6.1.0-rc4-00024-g5b711f2d7b91 #198
[ 128.212839] Hardware name: riscv-virtio,qemu (DT)
[ 128.213459] epc : aplic_msi_write_msg+0x110/0x12a
[ 128.213652] ra : aplic_msi_write_msg+0x1c/0x12a
[ 128.213823] epc : ffffffff8039eb80 ra : ffffffff8039ea8c sp :
ff2000001054bb10
[ 128.213884] gp : ffffffff812e9eb0 tp : ff600000032d3840 t0 :
0000000000000002
[ 128.213945] t1 : 0000000000000008 t2 : 0000000000000040 s0 :
ff2000001054bb30
[ 128.214015] s1 : ff600000018443a8 a0 : ff600000017e8c30 a1 :
0000000000000000
[ 128.214083] a2 : 0000000000000001 a3 : 000000000000000c a4 :
0000000000000003
[ 128.214141] a5 : 0000000000000000 a6 : 0000000000000000 a7 :
0000000000000000
[ 128.214173] s2 : ff2000001054bb40 s3 : ff600000017e8c30 s4 :
0000000200000022
[ 128.214246] s5 : ff600000017e8d78 s6 : 000000000000000c s7 :
ff600000017e8cb0
[ 128.214295] s8 : ffffffff80c5c8f0 s9 : ff6000000e97ab60 s10:
0000000000000000
[ 128.214327] s11: ff6000000e97ab78 t3 : 0000000000000004 t4 :
0000000000000002
[ 128.214383] t5 : 0000000000000000 t6 : 0000000000028000
[ 128.214414] status: 0000000200000100 badaddr: 0000000000000000
cause: 0000000000000003
[ 128.215267] [<ffffffff80453060>] platform_msi_write_msg+0x18/0x20
[ 128.215413] [<ffffffff80060b7a>] msi_domain_deactivate+0x2a/0x48
[ 128.215432] [<ffffffff8005e5a2>] __irq_domain_deactivate_irq+0x1c/0x30
[ 128.215450] [<ffffffff8005e5aa>] __irq_domain_deactivate_irq+0x24/0x30
[ 128.215464] [<ffffffff8005f9ea>] irq_domain_deactivate_irq+0x1c/0x30
[ 128.215477] [<ffffffff8005b8f6>] free_irq+0x1d0/0x27c
[ 128.219393] [<ffffffff8041be06>] univ8250_release_irq+0xa4/0xaa
[ 128.219417] [<ffffffff8041e018>] serial8250_do_shutdown+0xf0/0x166
[ 128.219431] [<ffffffff8041e0a8>] serial8250_shutdown+0x1a/0x22
[ 128.219444] [<ffffffff804174f0>] uart_port_shutdown+0x2c/0x42
[ 128.220230] [<ffffffff8041908a>] uart_shutdown+0x66/0x11e
[ 128.220247] [<ffffffff8041a69a>] uart_hangup+0x5e/0x100
[ 128.220260] [<ffffffff803fdaa2>] __tty_hangup.part.0+0x286/0x2ac
[ 128.220859] [<ffffffff803fec6c>] tty_ioctl+0x684/0x802
[ 128.220875] [<ffffffff8019ec48>] sys_ioctl+0x37e/0x95e
[ 128.221284] [<ffffffff800033d8>] ret_from_syscall+0x0/0x2
[ 128.221653] ---[ end trace 0000000000000000 ]---

> >
> > --
> > Regards,
> > Atish
>
>
>
> --
> Regards,
> Atish

--
Regards,
Atish