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Message-Id: <20220406201523.243733-1-laurent@vivier.eu>
Date: Wed, 6 Apr 2022 22:15:19 +0200
From: Laurent Vivier <laurent@...ier.eu>
To: linux-kernel@...r.kernel.org
Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>,
linux-m68k@...ts.linux-m68k.org,
Jiaxun Yang <jiaxun.yang@...goat.com>,
linux-rtc@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
John Stultz <john.stultz@...aro.org>,
Stephen Boyd <sboyd@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Alessandro Zummo <a.zummo@...ertech.it>,
Laurent Vivier <laurent@...ier.eu>
Subject: [PATCH v16 0/4] m68k: Add Virtual M68k Machine
The most powerful m68k machine emulated by QEMU is a Quadra 800,
but this machine is very limited: only 1 GiB of memory and only some
specific interfaces, with no DMA.
The Virtual M68k Machine is based on Goldfish interfaces defined by Google
for Android simulator. It uses Goldfish-rtc (timer and RTC),
Goldfish-pic (PIC) and Goldfish-tty (for early tty).
The machine is created with 128 virtio-mmio buses, and they can
be used to add serial console, GPU, disk, NIC, HID, hwrng, 9PFS...
The virtual m68k machine has been merged in QEMU and will be available
with the release 6.0.
This series introduces the support of this new machine in the linux kernel.
If you want to try:
- Configure and build latest QEMU with (or download qemu 6.0 binary):
.../configure --target-list=m68k-softmmu --enable-virglrenderer
make
- Configure and build linux with:
make virt_defconfig
make vmlinux
A pre-installed qcow2 disk image is available at:
http://vivier.eu/debian-10.0.qcow2
You can run the machine with something like:
qemu-system-m68k -M virt \
-m 3G \
-chardev stdio,signal=off,mux=on,id=char0 \
-mon chardev=char0,mode=readline \
-kernel vmlinux \
-append "console=hvc0 root=/dev/vda2" \
-blockdev node-name=system,driver=file,filename=debian-10.0.qcow2 \
-blockdev node-name=drive0,driver=qcow2,file=system \
-device virtio-blk-device,drive=drive0 \
-serial chardev:char0 \
-device virtio-net-device,netdev=hostnet0 \
-netdev bridge,id=hostnet0,br=virbr0,helper=/usr/libexec/qemu-bridge-helper \
-device virtio-serial-device \
-device virtio-gpu-device \
-device virtconsole,chardev=char0 \
-device virtio-keyboard-device \
-device virtio-mouse-device
You can watch a presentation about the machine on the Planet m68k channel:
https://youtu.be/s_ve0bCC9q4
[Demo at 38:00]
v16:
- rebase
- s/existin/existing/
- Add Acked-by from Daniel
- Add Reviewed-by from Geert
v15:
- rebase
- update clocksource patch description to remove URL
v14:
- address Geert's comments on v13
v13:
- rework clocksource according to Daniel's comments
- move the timer registers definition to include/clocksource/timer-goldfish.h
v12:
- add request_resource() for pic and virtctrl
- enable virtio-snd in virt_defconfig
- add #include <linux/goldfish.h> in rtc and timer
v11:
- rename goldfish_ioread32()/goldfish_iowrite32() to gf_ioread32()/gfiowrite32()
- move them to linux/goldfish.h and m68k/asm/io.h
- change patches order (tty first to revert my previous work)
- fix clocksource by clearing interrupt on tick not on next_event()
and clearing shift
- add missing clocksource_register_hz()
- rebase
v10:
- move goldfish_ioread32()/goldfish_iowrite32() to io.h
- also update goldfish-tty
- use READ_ONCE()/WRITE_ONCE() for in_nmi
v9:
- include <linux/memblock.h> to declare min_low_pfn
- goldfish accessors: s/CONFIG_CPU_BIG_ENDIAN/CONFIG_M68K/
v8:
- GF_PUT_CHAR is a 32bit register (in arch/m68k/kernel/head.S)
- rework goldfish-pic and virt_ctrl
v7:
- add "#include <linux/slab.h>" in timer-goldfish.c for kzalloc()
- update timer-goldfish Kconfig
- remove EXPORT_SYMBOL()
- introduce goldfish_ioread32()/goldfish_iowrite32()
v6:
- fix goldfish-rtc endianness
- move goldfish-timer code to drivers/clocksource
- remove LEGACY_TIMER_TICK and use directly goldfish-timer
v5:
- add GENERIC_CLOCKEVENTS in Kconfig.machine
v4:
- update PATCH 1: comments and parameter names
- add a patch to move to generic clockevents
(I prefer to have a separate patch as it can be used as an example to
move from legacy timer tick to generic clockevents)
v3:
- introduce config.h to export prototypes to arch/m68k/kernel/setup_mm.c
- define virt_nmi_handler as static
v2:
- Remove VIRTO_MENU set y
- sort the selects
- add CONFIG_LOCALVERSION="-virt"
- generate virt_defconfig using "make savedefconfig"
- rename MACH_VIRTONLY to MACH_VIRT_ONLY
- add a test_notvirt label in head.S
- rework iounmap() to use two separate #ifdefs
- use %u in virt_get_model()
- drop show_registers() in config.c
- drop pr_err() from config_virt()
- sort includes in ints.c
- call virt_irq_enable() in virt_irq_startup()
- drop virt_irq_shutdown() and use virt_irq_disable()
- move in_nmi into virt_nmi_handler()
- use pr_warn() in virt_nmi_handler()
- rework goldfish_pic_irq() IRQ scan
- copy goldfish-pic IRQs related information from QEMU hw/m68k/virt
- add a comment to "min_low_pfn = 0"
- use platform_device_register_simple()
- use goldfish_timer_read(), upper_32_bits() and lower_32_bits()
Thanks,
Laurent
Laurent Vivier (4):
tty: goldfish: introduce gf_ioread32()/gf_iowrite32()
rtc: goldfish: use gf_ioread32()/gf_iowrite32()
clocksource/drivers: Add a goldfish-timer clocksource
m68k: introduce a virtual m68k machine
arch/m68k/Kbuild | 1 +
arch/m68k/Kconfig.machine | 17 +++
arch/m68k/configs/virt_defconfig | 68 +++++++++
arch/m68k/include/asm/config.h | 2 +
arch/m68k/include/asm/io.h | 3 +
arch/m68k/include/asm/irq.h | 3 +-
arch/m68k/include/asm/pgtable_mm.h | 7 +
arch/m68k/include/asm/setup.h | 44 ++++--
arch/m68k/include/asm/virt.h | 25 ++++
arch/m68k/include/uapi/asm/bootinfo-virt.h | 18 +++
arch/m68k/include/uapi/asm/bootinfo.h | 1 +
arch/m68k/kernel/Makefile | 1 +
arch/m68k/kernel/head.S | 31 +++++
arch/m68k/kernel/setup_mm.c | 7 +
arch/m68k/mm/kmap.c | 21 ++-
arch/m68k/virt/Makefile | 6 +
arch/m68k/virt/config.c | 130 +++++++++++++++++
arch/m68k/virt/ints.c | 155 +++++++++++++++++++++
arch/m68k/virt/platform.c | 72 ++++++++++
drivers/clocksource/Kconfig | 7 +
drivers/clocksource/Makefile | 1 +
drivers/clocksource/timer-goldfish.c | 153 ++++++++++++++++++++
drivers/rtc/rtc-goldfish.c | 44 +++---
drivers/tty/goldfish.c | 20 +--
include/clocksource/timer-goldfish.h | 31 +++++
include/linux/goldfish.h | 15 +-
26 files changed, 825 insertions(+), 58 deletions(-)
create mode 100644 arch/m68k/configs/virt_defconfig
create mode 100644 arch/m68k/include/asm/virt.h
create mode 100644 arch/m68k/include/uapi/asm/bootinfo-virt.h
create mode 100644 arch/m68k/virt/Makefile
create mode 100644 arch/m68k/virt/config.c
create mode 100644 arch/m68k/virt/ints.c
create mode 100644 arch/m68k/virt/platform.c
create mode 100644 drivers/clocksource/timer-goldfish.c
create mode 100644 include/clocksource/timer-goldfish.h
--
2.35.1
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