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]
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):
m68k: add asm/config.h
rtc: goldfish: use __raw_writel()/__raw_readl()
clocksource/drivers: Add a goldfish-timer clocksource
m68k: introduce a virtual m68k machine
arch/m68k/Kbuild | 1 +
arch/m68k/Kconfig.machine | 15 +++
arch/m68k/amiga/config.c | 1 +
arch/m68k/apollo/config.c | 1 +
arch/m68k/atari/config.c | 1 +
arch/m68k/bvme6000/config.c | 1 +
arch/m68k/configs/virt_defconfig | 65 +++++++++++
arch/m68k/hp300/config.c | 1 +
arch/m68k/include/asm/config.h | 35 ++++++
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 | 30 ++---
arch/m68k/mac/config.c | 1 +
arch/m68k/mm/kmap.c | 23 ++--
arch/m68k/mvme147/config.c | 1 +
arch/m68k/mvme16x/config.c | 1 +
arch/m68k/q40/config.c | 1 +
arch/m68k/virt/Makefile | 6 +
arch/m68k/virt/config.c | 119 +++++++++++++++++++
arch/m68k/virt/ints.c | 120 +++++++++++++++++++
arch/m68k/virt/platform.c | 72 ++++++++++++
drivers/clocksource/Kconfig | 7 ++
drivers/clocksource/Makefile | 1 +
drivers/clocksource/timer-goldfish.c | 130 +++++++++++++++++++++
drivers/rtc/rtc-goldfish.c | 30 ++---
include/clocksource/timer-goldfish.h | 12 ++
32 files changed, 750 insertions(+), 55 deletions(-)
create mode 100644 arch/m68k/configs/virt_defconfig
create mode 100644 arch/m68k/include/asm/config.h
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
--
2.34.1
As android implementation defines the endianness of the device is the one
of the architecture replace all writel()/readl() by
__raw_writel()/__raw_readl()
https://android.googlesource.com/platform/external/qemu/+/refs/heads/emu-master-dev/hw/timer/goldfish_timer.c#177
The same change has been done for goldfish-tty:
commit da31de35cd2f ("tty: goldfish: use __raw_writel()/__raw_readl()")
Signed-off-by: Laurent Vivier <[email protected]>
---
drivers/rtc/rtc-goldfish.c | 30 +++++++++++++++---------------
1 file changed, 15 insertions(+), 15 deletions(-)
diff --git a/drivers/rtc/rtc-goldfish.c b/drivers/rtc/rtc-goldfish.c
index 7ab95d052644..3e76160d40b9 100644
--- a/drivers/rtc/rtc-goldfish.c
+++ b/drivers/rtc/rtc-goldfish.c
@@ -41,8 +41,8 @@ static int goldfish_rtc_read_alarm(struct device *dev,
rtcdrv = dev_get_drvdata(dev);
base = rtcdrv->base;
- rtc_alarm_low = readl(base + TIMER_ALARM_LOW);
- rtc_alarm_high = readl(base + TIMER_ALARM_HIGH);
+ rtc_alarm_low = __raw_readl(base + TIMER_ALARM_LOW);
+ rtc_alarm_high = __raw_readl(base + TIMER_ALARM_HIGH);
rtc_alarm = (rtc_alarm_high << 32) | rtc_alarm_low;
do_div(rtc_alarm, NSEC_PER_SEC);
@@ -50,7 +50,7 @@ static int goldfish_rtc_read_alarm(struct device *dev,
rtc_time64_to_tm(rtc_alarm, &alrm->time);
- if (readl(base + TIMER_ALARM_STATUS))
+ if (__raw_readl(base + TIMER_ALARM_STATUS))
alrm->enabled = 1;
else
alrm->enabled = 0;
@@ -71,18 +71,18 @@ static int goldfish_rtc_set_alarm(struct device *dev,
if (alrm->enabled) {
rtc_alarm64 = rtc_tm_to_time64(&alrm->time) * NSEC_PER_SEC;
- writel((rtc_alarm64 >> 32), base + TIMER_ALARM_HIGH);
- writel(rtc_alarm64, base + TIMER_ALARM_LOW);
- writel(1, base + TIMER_IRQ_ENABLED);
+ __raw_writel((rtc_alarm64 >> 32), base + TIMER_ALARM_HIGH);
+ __raw_writel(rtc_alarm64, base + TIMER_ALARM_LOW);
+ __raw_writel(1, base + TIMER_IRQ_ENABLED);
} else {
/*
* if this function was called with enabled=0
* then it could mean that the application is
* trying to cancel an ongoing alarm
*/
- rtc_status_reg = readl(base + TIMER_ALARM_STATUS);
+ rtc_status_reg = __raw_readl(base + TIMER_ALARM_STATUS);
if (rtc_status_reg)
- writel(1, base + TIMER_CLEAR_ALARM);
+ __raw_writel(1, base + TIMER_CLEAR_ALARM);
}
return 0;
@@ -98,9 +98,9 @@ static int goldfish_rtc_alarm_irq_enable(struct device *dev,
base = rtcdrv->base;
if (enabled)
- writel(1, base + TIMER_IRQ_ENABLED);
+ __raw_writel(1, base + TIMER_IRQ_ENABLED);
else
- writel(0, base + TIMER_IRQ_ENABLED);
+ __raw_writel(0, base + TIMER_IRQ_ENABLED);
return 0;
}
@@ -110,7 +110,7 @@ static irqreturn_t goldfish_rtc_interrupt(int irq, void *dev_id)
struct goldfish_rtc *rtcdrv = dev_id;
void __iomem *base = rtcdrv->base;
- writel(1, base + TIMER_CLEAR_INTERRUPT);
+ __raw_writel(1, base + TIMER_CLEAR_INTERRUPT);
rtc_update_irq(rtcdrv->rtc, 1, RTC_IRQF | RTC_AF);
@@ -128,8 +128,8 @@ static int goldfish_rtc_read_time(struct device *dev, struct rtc_time *tm)
rtcdrv = dev_get_drvdata(dev);
base = rtcdrv->base;
- time_low = readl(base + TIMER_TIME_LOW);
- time_high = readl(base + TIMER_TIME_HIGH);
+ time_low = __raw_readl(base + TIMER_TIME_LOW);
+ time_high = __raw_readl(base + TIMER_TIME_HIGH);
time = (time_high << 32) | time_low;
do_div(time, NSEC_PER_SEC);
@@ -149,8 +149,8 @@ static int goldfish_rtc_set_time(struct device *dev, struct rtc_time *tm)
base = rtcdrv->base;
now64 = rtc_tm_to_time64(tm) * NSEC_PER_SEC;
- writel((now64 >> 32), base + TIMER_TIME_HIGH);
- writel(now64, base + TIMER_TIME_LOW);
+ __raw_writel((now64 >> 32), base + TIMER_TIME_HIGH);
+ __raw_writel(now64, base + TIMER_TIME_LOW);
return 0;
}
--
2.34.1
To avoid 'warning: no previous prototype for' error, declare all
the parse_bootinfo and config functions prototypes into asm/config.h
and include it in arch/m68k/kernel/setup_mm.c and arch/m68k/*/config.c
Signed-off-by: Laurent Vivier <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
---
arch/m68k/amiga/config.c | 1 +
arch/m68k/apollo/config.c | 1 +
arch/m68k/atari/config.c | 1 +
arch/m68k/bvme6000/config.c | 1 +
arch/m68k/hp300/config.c | 1 +
arch/m68k/include/asm/config.h | 33 +++++++++++++++++++++++++++++++++
arch/m68k/kernel/setup_mm.c | 23 +----------------------
arch/m68k/mac/config.c | 1 +
arch/m68k/mvme147/config.c | 1 +
arch/m68k/mvme16x/config.c | 1 +
arch/m68k/q40/config.c | 1 +
11 files changed, 43 insertions(+), 22 deletions(-)
create mode 100644 arch/m68k/include/asm/config.h
diff --git a/arch/m68k/amiga/config.c b/arch/m68k/amiga/config.c
index be2dfab48fd4..3137b45750df 100644
--- a/arch/m68k/amiga/config.c
+++ b/arch/m68k/amiga/config.c
@@ -37,6 +37,7 @@
#include <asm/irq.h>
#include <asm/machdep.h>
#include <asm/io.h>
+#include <asm/config.h>
static unsigned long amiga_model;
diff --git a/arch/m68k/apollo/config.c b/arch/m68k/apollo/config.c
index 581a5f68d102..42a8b8e2b664 100644
--- a/arch/m68k/apollo/config.c
+++ b/arch/m68k/apollo/config.c
@@ -16,6 +16,7 @@
#include <asm/apollohw.h>
#include <asm/irq.h>
#include <asm/machdep.h>
+#include <asm/config.h>
u_long sio01_physaddr;
u_long sio23_physaddr;
diff --git a/arch/m68k/atari/config.c b/arch/m68k/atari/config.c
index 261a0f57cc9a..38a7c0578105 100644
--- a/arch/m68k/atari/config.c
+++ b/arch/m68k/atari/config.c
@@ -46,6 +46,7 @@
#include <asm/machdep.h>
#include <asm/hwtest.h>
#include <asm/io.h>
+#include <asm/config.h>
u_long atari_mch_cookie;
EXPORT_SYMBOL(atari_mch_cookie);
diff --git a/arch/m68k/bvme6000/config.c b/arch/m68k/bvme6000/config.c
index 0c6feafbbd11..9b060d466e03 100644
--- a/arch/m68k/bvme6000/config.c
+++ b/arch/m68k/bvme6000/config.c
@@ -36,6 +36,7 @@
#include <asm/traps.h>
#include <asm/machdep.h>
#include <asm/bvme6000hw.h>
+#include <asm/config.h>
static void bvme6000_get_model(char *model);
extern void bvme6000_sched_init(void);
diff --git a/arch/m68k/hp300/config.c b/arch/m68k/hp300/config.c
index ce1eb3d3d55d..2c92843397c3 100644
--- a/arch/m68k/hp300/config.c
+++ b/arch/m68k/hp300/config.c
@@ -22,6 +22,7 @@
#include <asm/blinken.h>
#include <asm/io.h> /* readb() and writeb() */
#include <asm/hp300hw.h>
+#include <asm/config.h>
#include "time.h"
diff --git a/arch/m68k/include/asm/config.h b/arch/m68k/include/asm/config.h
new file mode 100644
index 000000000000..aae61070628b
--- /dev/null
+++ b/arch/m68k/include/asm/config.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/*
+ * This file contains prototypes provided by each m68k machine
+ * to parse bootinfo data structures and to configure the machine
+ */
+
+#ifndef _M68K_CONFIG_H
+#define _M68K_CONFIG_H
+
+extern int amiga_parse_bootinfo(const struct bi_record *record);
+extern int atari_parse_bootinfo(const struct bi_record *record);
+extern int mac_parse_bootinfo(const struct bi_record *record);
+extern int q40_parse_bootinfo(const struct bi_record *record);
+extern int bvme6000_parse_bootinfo(const struct bi_record *record);
+extern int mvme16x_parse_bootinfo(const struct bi_record *record);
+extern int mvme147_parse_bootinfo(const struct bi_record *record);
+extern int hp300_parse_bootinfo(const struct bi_record *record);
+extern int apollo_parse_bootinfo(const struct bi_record *record);
+
+extern void config_amiga(void);
+extern void config_atari(void);
+extern void config_mac(void);
+extern void config_sun3(void);
+extern void config_apollo(void);
+extern void config_mvme147(void);
+extern void config_mvme16x(void);
+extern void config_bvme6000(void);
+extern void config_hp300(void);
+extern void config_q40(void);
+extern void config_sun3x(void);
+
+#endif /* _M68K_CONFIG_H */
diff --git a/arch/m68k/kernel/setup_mm.c b/arch/m68k/kernel/setup_mm.c
index 4b51bfd38e5f..226dc3750397 100644
--- a/arch/m68k/kernel/setup_mm.c
+++ b/arch/m68k/kernel/setup_mm.c
@@ -47,6 +47,7 @@
#endif
#include <asm/macintosh.h>
#include <asm/natfeat.h>
+#include <asm/config.h>
#if !FPSTATESIZE || !NR_IRQS
#warning No CPU/platform type selected, your kernel will not work!
@@ -113,28 +114,6 @@ EXPORT_SYMBOL(isa_type);
EXPORT_SYMBOL(isa_sex);
#endif
-extern int amiga_parse_bootinfo(const struct bi_record *);
-extern int atari_parse_bootinfo(const struct bi_record *);
-extern int mac_parse_bootinfo(const struct bi_record *);
-extern int q40_parse_bootinfo(const struct bi_record *);
-extern int bvme6000_parse_bootinfo(const struct bi_record *);
-extern int mvme16x_parse_bootinfo(const struct bi_record *);
-extern int mvme147_parse_bootinfo(const struct bi_record *);
-extern int hp300_parse_bootinfo(const struct bi_record *);
-extern int apollo_parse_bootinfo(const struct bi_record *);
-
-extern void config_amiga(void);
-extern void config_atari(void);
-extern void config_mac(void);
-extern void config_sun3(void);
-extern void config_apollo(void);
-extern void config_mvme147(void);
-extern void config_mvme16x(void);
-extern void config_bvme6000(void);
-extern void config_hp300(void);
-extern void config_q40(void);
-extern void config_sun3x(void);
-
#define MASK_256K 0xfffc0000
extern void paging_init(void);
diff --git a/arch/m68k/mac/config.c b/arch/m68k/mac/config.c
index 5d16f9b47aa9..65d124ec80bb 100644
--- a/arch/m68k/mac/config.c
+++ b/arch/m68k/mac/config.c
@@ -47,6 +47,7 @@
#include <asm/mac_via.h>
#include <asm/mac_oss.h>
#include <asm/mac_psc.h>
+#include <asm/config.h>
/* Mac bootinfo struct */
struct mac_booter_data mac_bi_data;
diff --git a/arch/m68k/mvme147/config.c b/arch/m68k/mvme147/config.c
index dfd6202fd403..b96ea7c76a19 100644
--- a/arch/m68k/mvme147/config.c
+++ b/arch/m68k/mvme147/config.c
@@ -34,6 +34,7 @@
#include <asm/traps.h>
#include <asm/machdep.h>
#include <asm/mvme147hw.h>
+#include <asm/config.h>
static void mvme147_get_model(char *model);
diff --git a/arch/m68k/mvme16x/config.c b/arch/m68k/mvme16x/config.c
index b4422c2dfbbf..88cbdc10925b 100644
--- a/arch/m68k/mvme16x/config.c
+++ b/arch/m68k/mvme16x/config.c
@@ -37,6 +37,7 @@
#include <asm/traps.h>
#include <asm/machdep.h>
#include <asm/mvme16xhw.h>
+#include <asm/config.h>
extern t_bdid mvme_bdid;
diff --git a/arch/m68k/q40/config.c b/arch/m68k/q40/config.c
index 5caf1e5be1c2..9237243077ce 100644
--- a/arch/m68k/q40/config.c
+++ b/arch/m68k/q40/config.c
@@ -34,6 +34,7 @@
#include <asm/traps.h>
#include <asm/machdep.h>
#include <asm/q40_master.h>
+#include <asm/config.h>
extern void q40_init_IRQ(void);
static void q40_get_model(char *model);
--
2.34.1
Add a clocksource based on the goldfish-rtc device.
Signed-off-by: Laurent Vivier <[email protected]>
---
drivers/clocksource/Kconfig | 7 ++
drivers/clocksource/Makefile | 1 +
drivers/clocksource/timer-goldfish.c | 130 +++++++++++++++++++++++++++
include/clocksource/timer-goldfish.h | 12 +++
4 files changed, 150 insertions(+)
create mode 100644 drivers/clocksource/timer-goldfish.c
create mode 100644 include/clocksource/timer-goldfish.h
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index f65e31bab9ae..6ca9bb78407d 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -711,4 +711,11 @@ config MICROCHIP_PIT64B
modes and high resolution. It is used as a clocksource
and a clockevent.
+config GOLDFISH_TIMER
+ bool "Clocksource using goldfish-rtc"
+ select RTC_CLASS
+ select RTC_DRV_GOLDFISH
+ help
+ Support for the timer/counter of goldfish-rtc
+
endmenu
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index c17ee32a7151..e624a1a27027 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -88,3 +88,4 @@ obj-$(CONFIG_CSKY_MP_TIMER) += timer-mp-csky.o
obj-$(CONFIG_GX6605S_TIMER) += timer-gx6605s.o
obj-$(CONFIG_HYPERV_TIMER) += hyperv_timer.o
obj-$(CONFIG_MICROCHIP_PIT64B) += timer-microchip-pit64b.o
+obj-$(CONFIG_GOLDFISH_TIMER) += timer-goldfish.o
diff --git a/drivers/clocksource/timer-goldfish.c b/drivers/clocksource/timer-goldfish.c
new file mode 100644
index 000000000000..b1553c3c9456
--- /dev/null
+++ b/drivers/clocksource/timer-goldfish.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
+#include <linux/module.h>
+#include <clocksource/timer-goldfish.h>
+
+#define TIMER_TIME_LOW 0x00 /* get low bits of current time */
+ /* and update TIMER_TIME_HIGH */
+#define TIMER_TIME_HIGH 0x04 /* get high bits of time at last */
+ /* TIMER_TIME_LOW read */
+#define TIMER_ALARM_LOW 0x08 /* set low bits of alarm and */
+ /* activate it */
+#define TIMER_ALARM_HIGH 0x0c /* set high bits of next alarm */
+#define TIMER_IRQ_ENABLED 0x10
+#define TIMER_CLEAR_ALARM 0x14
+#define TIMER_ALARM_STATUS 0x18
+#define TIMER_CLEAR_INTERRUPT 0x1c
+
+struct goldfish_timer {
+ struct clock_event_device ced;
+ struct resource res;
+ void __iomem *base;
+ int irq;
+};
+
+static struct goldfish_timer *ced_to_gf(struct clock_event_device *ced)
+{
+ return container_of(ced, struct goldfish_timer, ced);
+}
+
+static int goldfish_timer_set_oneshot(struct clock_event_device *evt)
+{
+ struct goldfish_timer *timerdrv = ced_to_gf(evt);
+ void __iomem *base = timerdrv->base;
+
+ __raw_writel(0, base + TIMER_ALARM_HIGH);
+ __raw_writel(0, base + TIMER_ALARM_LOW);
+ __raw_writel(1, base + TIMER_IRQ_ENABLED);
+
+ return 0;
+}
+
+static int goldfish_timer_shutdown(struct clock_event_device *evt)
+{
+ struct goldfish_timer *timerdrv = ced_to_gf(evt);
+ void __iomem *base = timerdrv->base;
+
+ __raw_writel(0, base + TIMER_IRQ_ENABLED);
+
+ return 0;
+}
+
+static int goldfish_timer_next_event(unsigned long delta,
+ struct clock_event_device *evt)
+{
+ struct goldfish_timer *timerdrv = ced_to_gf(evt);
+ void __iomem *base = timerdrv->base;
+ u64 now;
+
+ __raw_writel(1, base + TIMER_CLEAR_INTERRUPT);
+
+ /*
+ * time_low: get low bits of current time and update time_high
+ * time_high: get high bits of time at last time_low read
+ */
+ now = __raw_readl(base + TIMER_TIME_LOW);
+ now += (u64)__raw_readl(base + TIMER_TIME_HIGH) << 32;
+
+ now += delta;
+
+ __raw_writel(upper_32_bits(now), base + TIMER_ALARM_HIGH);
+ __raw_writel(lower_32_bits(now), base + TIMER_ALARM_LOW);
+
+ return 0;
+}
+
+static irqreturn_t golfish_timer_tick(int irq, void *dev_id)
+{
+ struct clock_event_device *evt = dev_id;
+
+ evt->event_handler(evt);
+
+ return IRQ_HANDLED;
+}
+
+void __init goldfish_timer_init(int irq, void __iomem *base)
+{
+ struct goldfish_timer *timerdrv;
+ int ret;
+
+ timerdrv = kzalloc(sizeof(*timerdrv), GFP_KERNEL);
+ if (!timerdrv)
+ return;
+
+ timerdrv->base = base;
+ timerdrv->irq = irq;
+
+ timerdrv->ced = (struct clock_event_device){
+ .name = "goldfish_timer",
+ .features = CLOCK_EVT_FEAT_ONESHOT,
+ .set_state_shutdown = goldfish_timer_shutdown,
+ .set_state_oneshot = goldfish_timer_set_oneshot,
+ .set_next_event = goldfish_timer_next_event,
+ .shift = 32,
+ };
+ timerdrv->res = (struct resource){
+ .name = "goldfish_timer",
+ .start = (unsigned long)base,
+ .end = (unsigned long)base + 0xfff,
+ };
+
+ if (request_resource(&iomem_resource, &timerdrv->res)) {
+ pr_err("Cannot allocate goldfish-timer resource\n");
+ return;
+ }
+
+ ret = request_irq(timerdrv->irq, golfish_timer_tick, IRQF_TIMER,
+ "goldfish_timer", &timerdrv->ced);
+ if (ret) {
+ pr_err("Couldn't register goldfish-timer interrupt\n");
+ return;
+ }
+
+ clockevents_config_and_register(&timerdrv->ced, NSEC_PER_SEC,
+ 1, 0xffffffff);
+}
+EXPORT_SYMBOL_GPL(goldfish_timer_init);
diff --git a/include/clocksource/timer-goldfish.h b/include/clocksource/timer-goldfish.h
new file mode 100644
index 000000000000..12bcd08f90af
--- /dev/null
+++ b/include/clocksource/timer-goldfish.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * goldfish-timer clocksource
+ */
+
+#ifndef _CLOCKSOURCE_GOLDFISH_TIMER_H
+#define _CLOCKSOURCE_GOLDFISH_TIMER_H
+
+extern void goldfish_timer_init(int irq, void __iomem *base);
+
+#endif /* _CLOCKSOURCE_GOLDFISH_TIMER_H */
+
--
2.34.1
This machine allows to have up to 3.2 GiB and 128 Virtio devices.
It is based on android goldfish devices.
Signed-off-by: Laurent Vivier <[email protected]>
---
arch/m68k/Kbuild | 1 +
arch/m68k/Kconfig.machine | 15 +++
arch/m68k/configs/virt_defconfig | 65 +++++++++++
arch/m68k/include/asm/config.h | 2 +
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 | 23 ++--
arch/m68k/virt/Makefile | 6 ++
arch/m68k/virt/config.c | 119 ++++++++++++++++++++
arch/m68k/virt/ints.c | 120 +++++++++++++++++++++
arch/m68k/virt/platform.c | 72 +++++++++++++
18 files changed, 542 insertions(+), 18 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
diff --git a/arch/m68k/Kbuild b/arch/m68k/Kbuild
index 18abb35c26a1..7762af9f6def 100644
--- a/arch/m68k/Kbuild
+++ b/arch/m68k/Kbuild
@@ -17,3 +17,4 @@ obj-$(CONFIG_M68060) += ifpsp060/
obj-$(CONFIG_M68KFPU_EMU) += math-emu/
obj-$(CONFIG_M68000) += 68000/
obj-$(CONFIG_COLDFIRE) += coldfire/
+obj-$(CONFIG_VIRT) += virt/
diff --git a/arch/m68k/Kconfig.machine b/arch/m68k/Kconfig.machine
index eeab4f3e6c19..0a2c5d61567d 100644
--- a/arch/m68k/Kconfig.machine
+++ b/arch/m68k/Kconfig.machine
@@ -149,6 +149,21 @@ config SUN3
If you don't want to compile a kernel exclusively for a Sun 3, say N.
+config VIRT
+ bool "Virtual M68k Machine support"
+ depends on MMU
+ select GENERIC_CLOCKEVENTS
+ select M68040
+ select MMU_MOTOROLA if MMU
+ select GOLDFISH
+ select GOLDFISH_TIMER
+ select GOLDFISH_TTY
+ select TTY
+ select VIRTIO_MMIO
+ help
+ This options enable a pure virtual machine based on m68k,
+ VIRTIO MMIO devices and GOLDFISH interfaces (TTY, RTC, PIC)
+
config PILOT
bool
diff --git a/arch/m68k/configs/virt_defconfig b/arch/m68k/configs/virt_defconfig
new file mode 100644
index 000000000000..462e51ef69eb
--- /dev/null
+++ b/arch/m68k/configs/virt_defconfig
@@ -0,0 +1,65 @@
+CONFIG_LOCALVERSION="-virt"
+CONFIG_SYSVIPC=y
+CONFIG_CGROUPS=y
+CONFIG_BLK_CGROUP=y
+CONFIG_CGROUP_SCHED=y
+CONFIG_CGROUP_PIDS=y
+CONFIG_CGROUP_RDMA=y
+CONFIG_CGROUP_FREEZER=y
+CONFIG_CGROUP_DEVICE=y
+CONFIG_CGROUP_CPUACCT=y
+CONFIG_VIRT=y
+CONFIG_PROC_HARDWARE=y
+CONFIG_PARTITION_ADVANCED=y
+CONFIG_AMIGA_PARTITION=y
+CONFIG_ATARI_PARTITION=y
+CONFIG_MAC_PARTITION=y
+CONFIG_BSD_DISKLABEL=y
+CONFIG_MINIX_SUBPARTITION=y
+CONFIG_SOLARIS_X86_PARTITION=y
+CONFIG_UNIXWARE_DISKLABEL=y
+CONFIG_LDM_PARTITION=y
+CONFIG_LDM_DEBUG=y
+CONFIG_SUN_PARTITION=y
+CONFIG_SYSV68_PARTITION=y
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+CONFIG_IP_PNP=y
+CONFIG_IP_PNP_DHCP=y
+CONFIG_IP_PNP_BOOTP=y
+CONFIG_CGROUP_NET_PRIO=y
+CONFIG_CGROUP_NET_CLASSID=y
+CONFIG_NET_9P=y
+CONFIG_NET_9P_VIRTIO=y
+CONFIG_DEVTMPFS=y
+CONFIG_BLK_DEV_LOOP=y
+CONFIG_BLK_DEV_RAM=y
+CONFIG_VIRTIO_BLK=y
+CONFIG_SCSI=y
+CONFIG_BLK_DEV_SR=y
+CONFIG_SCSI_VIRTIO=y
+CONFIG_NETDEVICES=y
+CONFIG_VIRTIO_NET=y
+CONFIG_INPUT_MOUSEDEV=y
+CONFIG_INPUT_EVDEV=y
+CONFIG_VIRTIO_CONSOLE=y
+CONFIG_HW_RANDOM_VIRTIO=y
+CONFIG_DRM=y
+CONFIG_DRM_VIRTIO_GPU=y
+CONFIG_FB=y
+CONFIG_VIRT_DRIVERS=y
+CONFIG_VIRTIO_INPUT=y
+CONFIG_EXT4_FS=y
+CONFIG_AUTOFS_FS=y
+CONFIG_ISO9660_FS=y
+CONFIG_JOLIET=y
+CONFIG_ZISOFS=y
+CONFIG_UDF_FS=y
+CONFIG_TMPFS=y
+CONFIG_TMPFS_POSIX_ACL=y
+CONFIG_9P_FS=y
+CONFIG_9P_FS_POSIX_ACL=y
+CONFIG_9P_FS_SECURITY=y
+CONFIG_EARLY_PRINTK=y
diff --git a/arch/m68k/include/asm/config.h b/arch/m68k/include/asm/config.h
index aae61070628b..b9dacc52f2c8 100644
--- a/arch/m68k/include/asm/config.h
+++ b/arch/m68k/include/asm/config.h
@@ -17,6 +17,7 @@ extern int mvme16x_parse_bootinfo(const struct bi_record *record);
extern int mvme147_parse_bootinfo(const struct bi_record *record);
extern int hp300_parse_bootinfo(const struct bi_record *record);
extern int apollo_parse_bootinfo(const struct bi_record *record);
+extern int virt_parse_bootinfo(const struct bi_record *record);
extern void config_amiga(void);
extern void config_atari(void);
@@ -29,5 +30,6 @@ extern void config_bvme6000(void);
extern void config_hp300(void);
extern void config_q40(void);
extern void config_sun3x(void);
+extern void config_virt(void);
#endif /* _M68K_CONFIG_H */
diff --git a/arch/m68k/include/asm/irq.h b/arch/m68k/include/asm/irq.h
index 91dd493791d7..7829e955ca04 100644
--- a/arch/m68k/include/asm/irq.h
+++ b/arch/m68k/include/asm/irq.h
@@ -12,7 +12,8 @@
*/
#if defined(CONFIG_COLDFIRE)
#define NR_IRQS 256
-#elif defined(CONFIG_VME) || defined(CONFIG_SUN3) || defined(CONFIG_SUN3X)
+#elif defined(CONFIG_VME) || defined(CONFIG_SUN3) || \
+ defined(CONFIG_SUN3X) || defined(CONFIG_VIRT)
#define NR_IRQS 200
#elif defined(CONFIG_ATARI)
#define NR_IRQS 141
diff --git a/arch/m68k/include/asm/pgtable_mm.h b/arch/m68k/include/asm/pgtable_mm.h
index 143ba7de9bda..9b4e2fe2ac82 100644
--- a/arch/m68k/include/asm/pgtable_mm.h
+++ b/arch/m68k/include/asm/pgtable_mm.h
@@ -80,6 +80,9 @@
#elif defined(CONFIG_COLDFIRE)
#define KMAP_START 0xe0000000
#define KMAP_END 0xf0000000
+#elif defined(CONFIG_VIRT)
+#define KMAP_START 0xdf000000
+#define KMAP_END 0xff000000
#else
#define KMAP_START 0xd0000000
#define KMAP_END 0xf0000000
@@ -92,6 +95,10 @@ extern unsigned long m68k_vmalloc_end;
#elif defined(CONFIG_COLDFIRE)
#define VMALLOC_START 0xd0000000
#define VMALLOC_END 0xe0000000
+#elif defined(CONFIG_VIRT)
+#define VMALLOC_OFFSET PAGE_SIZE
+#define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
+#define VMALLOC_END KMAP_START
#else
/* Just any arbitrary offset to the start of the vmalloc VM area: the
* current 8MB value just means that there will be a 8MB "hole" after the
diff --git a/arch/m68k/include/asm/setup.h b/arch/m68k/include/asm/setup.h
index 8f2023f8c1c4..2c99477aaf89 100644
--- a/arch/m68k/include/asm/setup.h
+++ b/arch/m68k/include/asm/setup.h
@@ -37,7 +37,8 @@ extern unsigned long m68k_machtype;
#elif defined(CONFIG_ATARI) || defined(CONFIG_MAC) || defined(CONFIG_APOLLO) \
|| defined(CONFIG_MVME16x) || defined(CONFIG_BVME6000) \
|| defined(CONFIG_HP300) || defined(CONFIG_Q40) \
- || defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+ || defined(CONFIG_SUN3X) || defined(CONFIG_MVME147) \
+ || defined(CONFIG_VIRT)
# define MACH_IS_AMIGA (m68k_machtype == MACH_AMIGA)
#else
# define MACH_AMIGA_ONLY
@@ -50,7 +51,8 @@ extern unsigned long m68k_machtype;
#elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_APOLLO) \
|| defined(CONFIG_MVME16x) || defined(CONFIG_BVME6000) \
|| defined(CONFIG_HP300) || defined(CONFIG_Q40) \
- || defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+ || defined(CONFIG_SUN3X) || defined(CONFIG_MVME147) \
+ || defined(CONFIG_VIRT)
# define MACH_IS_ATARI (m68k_machtype == MACH_ATARI)
#else
# define MACH_ATARI_ONLY
@@ -63,7 +65,8 @@ extern unsigned long m68k_machtype;
#elif defined(CONFIG_AMIGA) || defined(CONFIG_ATARI) || defined(CONFIG_APOLLO) \
|| defined(CONFIG_MVME16x) || defined(CONFIG_BVME6000) \
|| defined(CONFIG_HP300) || defined(CONFIG_Q40) \
- || defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+ || defined(CONFIG_SUN3X) || defined(CONFIG_MVME147) \
+ || defined(CONFIG_VIRT)
# define MACH_IS_MAC (m68k_machtype == MACH_MAC)
#else
# define MACH_MAC_ONLY
@@ -84,7 +87,8 @@ extern unsigned long m68k_machtype;
#elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
|| defined(CONFIG_MVME16x) || defined(CONFIG_BVME6000) \
|| defined(CONFIG_HP300) || defined(CONFIG_Q40) \
- || defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+ || defined(CONFIG_SUN3X) || defined(CONFIG_MVME147) \
+ || defined(CONFIG_VIRT)
# define MACH_IS_APOLLO (m68k_machtype == MACH_APOLLO)
#else
# define MACH_APOLLO_ONLY
@@ -97,7 +101,8 @@ extern unsigned long m68k_machtype;
#elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
|| defined(CONFIG_APOLLO) || defined(CONFIG_BVME6000) \
|| defined(CONFIG_HP300) || defined(CONFIG_Q40) \
- || defined(CONFIG_SUN3X) || defined(CONFIG_MVME16x)
+ || defined(CONFIG_SUN3X) || defined(CONFIG_MVME16x) \
+ || defined(CONFIG_VIRT)
# define MACH_IS_MVME147 (m68k_machtype == MACH_MVME147)
#else
# define MACH_MVME147_ONLY
@@ -110,7 +115,8 @@ extern unsigned long m68k_machtype;
#elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
|| defined(CONFIG_APOLLO) || defined(CONFIG_BVME6000) \
|| defined(CONFIG_HP300) || defined(CONFIG_Q40) \
- || defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+ || defined(CONFIG_SUN3X) || defined(CONFIG_MVME147) \
+ || defined(CONFIG_VIRT)
# define MACH_IS_MVME16x (m68k_machtype == MACH_MVME16x)
#else
# define MACH_MVME16x_ONLY
@@ -123,7 +129,8 @@ extern unsigned long m68k_machtype;
#elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
|| defined(CONFIG_APOLLO) || defined(CONFIG_MVME16x) \
|| defined(CONFIG_HP300) || defined(CONFIG_Q40) \
- || defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+ || defined(CONFIG_SUN3X) || defined(CONFIG_MVME147) \
+ || defined(CONFIG_VIRT)
# define MACH_IS_BVME6000 (m68k_machtype == MACH_BVME6000)
#else
# define MACH_BVME6000_ONLY
@@ -136,7 +143,8 @@ extern unsigned long m68k_machtype;
#elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
|| defined(CONFIG_APOLLO) || defined(CONFIG_MVME16x) \
|| defined(CONFIG_BVME6000) || defined(CONFIG_Q40) \
- || defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+ || defined(CONFIG_SUN3X) || defined(CONFIG_MVME147) \
+ || defined(CONFIG_VIRT)
# define MACH_IS_HP300 (m68k_machtype == MACH_HP300)
#else
# define MACH_HP300_ONLY
@@ -149,7 +157,8 @@ extern unsigned long m68k_machtype;
#elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
|| defined(CONFIG_APOLLO) || defined(CONFIG_MVME16x) \
|| defined(CONFIG_BVME6000) || defined(CONFIG_HP300) \
- || defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+ || defined(CONFIG_SUN3X) || defined(CONFIG_MVME147) \
+ || defined(CONFIG_VIRT)
# define MACH_IS_Q40 (m68k_machtype == MACH_Q40)
#else
# define MACH_Q40_ONLY
@@ -162,7 +171,8 @@ extern unsigned long m68k_machtype;
#elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
|| defined(CONFIG_APOLLO) || defined(CONFIG_MVME16x) \
|| defined(CONFIG_BVME6000) || defined(CONFIG_HP300) \
- || defined(CONFIG_Q40) || defined(CONFIG_MVME147)
+ || defined(CONFIG_Q40) || defined(CONFIG_MVME147) \
+ || defined(CONFIG_VIRT)
# define MACH_IS_SUN3X (m68k_machtype == MACH_SUN3X)
#else
# define CONFIG_SUN3X_ONLY
@@ -170,6 +180,20 @@ extern unsigned long m68k_machtype;
# define MACH_TYPE (MACH_SUN3X)
#endif
+#if !defined(CONFIG_VIRT)
+# define MACH_IS_VIRT (0)
+#elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
+ || defined(CONFIG_APOLLO) || defined(CONFIG_MVME16x) \
+ || defined(CONFIG_BVME6000) || defined(CONFIG_HP300) \
+ || defined(CONFIG_Q40) || defined(CONFIG_SUN3X) \
+ || defined(CONFIG_MVME147)
+# define MACH_IS_VIRT (m68k_machtype == MACH_VIRT)
+#else
+# define MACH_VIRT_ONLY
+# define MACH_IS_VIRT (1)
+# define MACH_TYPE (MACH_VIRT)
+#endif
+
#ifndef MACH_TYPE
# define MACH_TYPE (m68k_machtype)
#endif
diff --git a/arch/m68k/include/asm/virt.h b/arch/m68k/include/asm/virt.h
new file mode 100644
index 000000000000..87647c17afd7
--- /dev/null
+++ b/arch/m68k/include/asm/virt.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_VIRT_H
+#define __ASM_VIRT_H
+
+#define NUM_VIRT_SOURCES 200
+
+struct virt_booter_device_data {
+ unsigned long mmio;
+ unsigned long irq;
+};
+
+struct virt_booter_data {
+ unsigned long qemu_version;
+ struct virt_booter_device_data pic;
+ struct virt_booter_device_data rtc;
+ struct virt_booter_device_data tty;
+ struct virt_booter_device_data ctrl;
+ struct virt_booter_device_data virtio;
+};
+
+extern struct virt_booter_data virt_bi_data;
+
+extern void __init virt_init_IRQ(void);
+
+#endif
diff --git a/arch/m68k/include/uapi/asm/bootinfo-virt.h b/arch/m68k/include/uapi/asm/bootinfo-virt.h
new file mode 100644
index 000000000000..ab17fd9d200d
--- /dev/null
+++ b/arch/m68k/include/uapi/asm/bootinfo-virt.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * asm/bootinfo-virt.h -- Virtual-m68k-specific boot information definitions
+ */
+
+#ifndef _UAPI_ASM_M68K_BOOTINFO_VIRT_H
+#define _UAPI_ASM_M68K_BOOTINFO_VIRT_H
+
+#define BI_VIRT_QEMU_VERSION 0x8000
+#define BI_VIRT_GF_PIC_BASE 0x8001
+#define BI_VIRT_GF_RTC_BASE 0x8002
+#define BI_VIRT_GF_TTY_BASE 0x8003
+#define BI_VIRT_VIRTIO_BASE 0x8004
+#define BI_VIRT_CTRL_BASE 0x8005
+
+#define VIRT_BOOTI_VERSION MK_BI_VERSION(2, 0)
+
+#endif /* _UAPI_ASM_M68K_BOOTINFO_MAC_H */
diff --git a/arch/m68k/include/uapi/asm/bootinfo.h b/arch/m68k/include/uapi/asm/bootinfo.h
index 38d3140381fa..203d9cbf9630 100644
--- a/arch/m68k/include/uapi/asm/bootinfo.h
+++ b/arch/m68k/include/uapi/asm/bootinfo.h
@@ -83,6 +83,7 @@ struct mem_info {
#define MACH_SUN3X 11
#define MACH_M54XX 12
#define MACH_M5441X 13
+#define MACH_VIRT 14
/*
diff --git a/arch/m68k/kernel/Makefile b/arch/m68k/kernel/Makefile
index dbac7f8743fc..c0833da6a2ca 100644
--- a/arch/m68k/kernel/Makefile
+++ b/arch/m68k/kernel/Makefile
@@ -11,6 +11,7 @@ extra-$(CONFIG_VME) := head.o
extra-$(CONFIG_HP300) := head.o
extra-$(CONFIG_Q40) := head.o
extra-$(CONFIG_SUN3X) := head.o
+extra-$(CONFIG_VIRT) := head.o
extra-$(CONFIG_SUN3) := sun3-head.o
extra-y += vmlinux.lds
diff --git a/arch/m68k/kernel/head.S b/arch/m68k/kernel/head.S
index 493c95db0e51..ca9ccf23de86 100644
--- a/arch/m68k/kernel/head.S
+++ b/arch/m68k/kernel/head.S
@@ -262,6 +262,7 @@
#include <asm/bootinfo-hp300.h>
#include <asm/bootinfo-mac.h>
#include <asm/bootinfo-q40.h>
+#include <asm/bootinfo-virt.h>
#include <asm/bootinfo-vme.h>
#include <asm/setup.h>
#include <asm/entry.h>
@@ -534,6 +535,7 @@ func_define putn,1
#define is_not_apollo(lab) cmpl &MACH_APOLLO,%pc@(m68k_machtype); jne lab
#define is_not_q40(lab) cmpl &MACH_Q40,%pc@(m68k_machtype); jne lab
#define is_not_sun3x(lab) cmpl &MACH_SUN3X,%pc@(m68k_machtype); jne lab
+#define is_not_virt(lab) cmpl &MACH_VIRT,%pc@(m68k_machtype); jne lab
#define hasnt_leds(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); \
jeq 42f; \
@@ -647,6 +649,14 @@ ENTRY(__start)
L(test_notmac):
#endif /* CONFIG_MAC */
+#ifdef CONFIG_VIRT
+ is_not_virt(L(test_notvirt))
+
+ get_bi_record BI_VIRT_GF_TTY_BASE
+ lea %pc@(L(virt_gf_tty_base)),%a1
+ movel %a0@,%a1@
+L(test_notvirt):
+#endif /* CONFIG_VIRT */
/*
* There are ultimately two pieces of information we want for all kinds of
@@ -1237,6 +1247,13 @@ L(mmu_init_not_mac):
L(notsun3x):
#endif
+#ifdef CONFIG_VIRT
+ is_not_virt(L(novirt))
+ mmu_map_tt #1,#0xFF000000,#0x01000000,#_PAGE_NOCACHE_S
+ jbra L(mmu_init_done)
+L(novirt):
+#endif
+
#ifdef CONFIG_APOLLO
is_not_apollo(L(notapollo))
@@ -3186,6 +3203,14 @@ func_start serial_putc,%d0/%d1/%a0/%a1
3:
#endif
+#ifdef CONFIG_VIRT
+ is_not_virt(1f)
+
+ movel L(virt_gf_tty_base),%a1
+ moveb %d0,%a1@(GF_PUT_CHAR)
+1:
+#endif
+
L(serial_putc_done):
func_return serial_putc
@@ -3865,3 +3890,9 @@ q40_mem_cptr:
L(q40_do_debug):
.long 0
#endif
+
+#if defined(CONFIG_VIRT)
+GF_PUT_CHAR = 0x00
+L(virt_gf_tty_base):
+ .long 0
+#endif /* CONFIG_VIRT */
diff --git a/arch/m68k/kernel/setup_mm.c b/arch/m68k/kernel/setup_mm.c
index 226dc3750397..b4ece3b05504 100644
--- a/arch/m68k/kernel/setup_mm.c
+++ b/arch/m68k/kernel/setup_mm.c
@@ -182,6 +182,8 @@ static void __init m68k_parse_bootinfo(const struct bi_record *record)
unknown = hp300_parse_bootinfo(record);
else if (MACH_IS_APOLLO)
unknown = apollo_parse_bootinfo(record);
+ else if (MACH_IS_VIRT)
+ unknown = virt_parse_bootinfo(record);
else
unknown = 1;
}
@@ -312,6 +314,11 @@ void __init setup_arch(char **cmdline_p)
cf_mmu_context_init();
config_BSP(NULL, 0);
break;
+#endif
+#ifdef CONFIG_VIRT
+ case MACH_VIRT:
+ config_virt();
+ break;
#endif
default:
panic("No configuration setup");
diff --git a/arch/m68k/mm/kmap.c b/arch/m68k/mm/kmap.c
index 20ddf71b43d0..39729f40d106 100644
--- a/arch/m68k/mm/kmap.c
+++ b/arch/m68k/mm/kmap.c
@@ -179,6 +179,12 @@ void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cachefla
return (void __iomem *)physaddr;
}
#endif
+#ifdef CONFIG_VIRT
+ if (MACH_IS_VIRT) {
+ if (physaddr >= 0xff000000 && cacheflag == IOMAP_NOCACHE_SER)
+ return (void __iomem *)physaddr;
+ }
+#endif
#ifdef CONFIG_COLDFIRE
if (__cf_internalio(physaddr))
return (void __iomem *) physaddr;
@@ -292,18 +298,21 @@ EXPORT_SYMBOL(__ioremap);
*/
void iounmap(void __iomem *addr)
{
-#ifdef CONFIG_AMIGA
- if ((!MACH_IS_AMIGA) ||
- (((unsigned long)addr < 0x40000000) ||
- ((unsigned long)addr > 0x60000000)))
- free_io_area((__force void *)addr);
-#else
+#if defined(CONFIG_AMIGA)
+ if (MACH_IS_AMIGA &&
+ ((unsigned long)addr >= 0x40000000) &&
+ ((unsigned long)addr < 0x60000000))
+ return;
+#endif
+#if defined(CONFIG_VIRT)
+ if (MACH_IS_VIRT && (unsigned long)addr >= 0xff000000)
+ return;
+#endif
#ifdef CONFIG_COLDFIRE
if (cf_internalio(addr))
return;
#endif
free_io_area((__force void *)addr);
-#endif
}
EXPORT_SYMBOL(iounmap);
diff --git a/arch/m68k/virt/Makefile b/arch/m68k/virt/Makefile
new file mode 100644
index 000000000000..54b9b2866654
--- /dev/null
+++ b/arch/m68k/virt/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for Linux arch/m68k/virt source directory
+#
+
+obj-y := config.o ints.o platform.o
diff --git a/arch/m68k/virt/config.c b/arch/m68k/virt/config.c
new file mode 100644
index 000000000000..fa769669db07
--- /dev/null
+++ b/arch/m68k/virt/config.c
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/serial_core.h>
+#include <clocksource/timer-goldfish.h>
+
+#include <asm/bootinfo.h>
+#include <asm/bootinfo-virt.h>
+#include <asm/byteorder.h>
+#include <asm/machdep.h>
+#include <asm/virt.h>
+#include <asm/config.h>
+
+struct virt_booter_data virt_bi_data;
+
+struct virt_ctrl {
+ u32 features;
+ u32 cmd;
+};
+
+enum {
+ CMD_NOOP,
+ CMD_RESET,
+ CMD_HALT,
+ CMD_PANIC,
+};
+
+#define virt_ctrl ((volatile struct virt_ctrl *)virt_bi_data.ctrl.mmio)
+
+static void virt_get_model(char *str)
+{
+ /* str is 80 characters long */
+ sprintf(str, "QEMU Virtual M68K Machine (%u.%u.%u)",
+ (u8)(virt_bi_data.qemu_version >> 24),
+ (u8)(virt_bi_data.qemu_version >> 16),
+ (u8)(virt_bi_data.qemu_version >> 8));
+}
+
+static void virt_halt(void)
+{
+ virt_ctrl->cmd = CMD_HALT;
+ local_irq_disable();
+ while (1)
+ ;
+}
+
+static void virt_reset(void)
+{
+ virt_ctrl->cmd = CMD_RESET;
+ local_irq_disable();
+ while (1)
+ ;
+}
+
+/*
+ * Parse a virtual-m68k-specific record in the bootinfo
+ */
+
+int __init virt_parse_bootinfo(const struct bi_record *record)
+{
+ int unknown = 0;
+ const void *data = record->data;
+
+ switch (be16_to_cpu(record->tag)) {
+ case BI_VIRT_QEMU_VERSION:
+ virt_bi_data.qemu_version = be32_to_cpup(data);
+ break;
+ case BI_VIRT_GF_PIC_BASE:
+ virt_bi_data.pic.mmio = be32_to_cpup(data);
+ data += 4;
+ virt_bi_data.pic.irq = be32_to_cpup(data);
+ break;
+ case BI_VIRT_GF_RTC_BASE:
+ virt_bi_data.rtc.mmio = be32_to_cpup(data);
+ data += 4;
+ virt_bi_data.rtc.irq = be32_to_cpup(data);
+ break;
+ case BI_VIRT_GF_TTY_BASE:
+ virt_bi_data.tty.mmio = be32_to_cpup(data);
+ data += 4;
+ virt_bi_data.tty.irq = be32_to_cpup(data);
+ break;
+ case BI_VIRT_CTRL_BASE:
+ virt_bi_data.ctrl.mmio = be32_to_cpup(data);
+ data += 4;
+ virt_bi_data.ctrl.irq = be32_to_cpup(data);
+ break;
+ case BI_VIRT_VIRTIO_BASE:
+ virt_bi_data.virtio.mmio = be32_to_cpup(data);
+ data += 4;
+ virt_bi_data.virtio.irq = be32_to_cpup(data);
+ break;
+ default:
+ unknown = 1;
+ break;
+ }
+ return unknown;
+}
+
+static void __init virt_sched_init(void)
+{
+ goldfish_timer_init(virt_bi_data.rtc.irq,
+ (void *)virt_bi_data.rtc.mmio);
+}
+
+void __init config_virt(void)
+{
+ char earlycon[24];
+
+ snprintf(earlycon, sizeof(earlycon), "early_gf_tty,0x%08lx",
+ virt_bi_data.tty.mmio);
+ setup_earlycon(earlycon);
+
+ mach_init_IRQ = virt_init_IRQ;
+ mach_sched_init = virt_sched_init;
+ mach_get_model = virt_get_model;
+ mach_reset = virt_reset;
+ mach_halt = virt_halt;
+ mach_power_off = virt_halt;
+}
diff --git a/arch/m68k/virt/ints.c b/arch/m68k/virt/ints.c
new file mode 100644
index 000000000000..7b2827f84b09
--- /dev/null
+++ b/arch/m68k/virt/ints.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/sched/debug.h>
+#include <linux/types.h>
+
+#include <asm/hwtest.h>
+#include <asm/irq.h>
+#include <asm/irq_regs.h>
+#include <asm/virt.h>
+
+struct goldfish_pic {
+ u32 status;
+ u32 irq_pending;
+ u32 irq_diable_all;
+ u32 disable;
+ u32 enable;
+ u32 pad[1019];
+};
+
+extern void show_registers(struct pt_regs *);
+
+#define gf_pic ((volatile struct goldfish_pic *)virt_bi_data.pic.mmio)
+
+#define GF_PIC(irq) (gf_pic[(irq - IRQ_USER) / 32])
+#define GF_IRQ(irq) ((irq - IRQ_USER) % 32)
+
+static void virt_irq_enable(struct irq_data *data)
+{
+ GF_PIC(data->irq).enable = 1 << GF_IRQ(data->irq);
+}
+
+static void virt_irq_disable(struct irq_data *data)
+{
+ GF_PIC(data->irq).disable = 1 << GF_IRQ(data->irq);
+}
+
+static unsigned int virt_irq_startup(struct irq_data *data)
+{
+ virt_irq_enable(data);
+ return 0;
+}
+
+static irqreturn_t virt_nmi_handler(int irq, void *dev_id)
+{
+ static volatile int in_nmi;
+
+ if (in_nmi)
+ return IRQ_HANDLED;
+ in_nmi = 1;
+
+ pr_warn("Non-Maskable Interrupt\n");
+ show_registers(get_irq_regs());
+
+ in_nmi = 0;
+ return IRQ_HANDLED;
+}
+
+static struct irq_chip virt_irq_chip = {
+ .name = "virt",
+ .irq_enable = virt_irq_enable,
+ .irq_disable = virt_irq_disable,
+ .irq_startup = virt_irq_startup,
+ .irq_shutdown = virt_irq_disable,
+};
+
+static void goldfish_pic_irq(struct irq_desc *desc)
+{
+ u32 irq_pending;
+ int irq_num;
+
+ irq_pending = gf_pic[desc->irq_data.irq - 1].irq_pending;
+ irq_num = IRQ_USER + (desc->irq_data.irq - 1) * 32;
+
+ do {
+ if (irq_pending & 1)
+ generic_handle_irq(irq_num);
+ ++irq_num;
+ irq_pending >>= 1;
+ } while (irq_pending);
+}
+
+/*
+ * 6 goldfish-pic for CPU IRQ #1 to IRQ #6
+ * CPU IRQ #1 -> PIC #1
+ * IRQ #1 to IRQ #31 -> unused
+ * IRQ #32 -> goldfish-tty
+ * CPU IRQ #2 -> PIC #2
+ * IRQ #1 to IRQ #32 -> virtio-mmio from 1 to 32
+ * CPU IRQ #3 -> PIC #3
+ * IRQ #1 to IRQ #32 -> virtio-mmio from 33 to 64
+ * CPU IRQ #4 -> PIC #4
+ * IRQ #1 to IRQ #32 -> virtio-mmio from 65 to 96
+ * CPU IRQ #5 -> PIC #5
+ * IRQ #1 to IRQ #32 -> virtio-mmio from 97 to 128
+ * CPU IRQ #6 -> PIC #6
+ * IRQ #1 -> goldfish-rtc
+ * IRQ #2 to IRQ #32 -> unused
+ * CPU IRQ #7 -> NMI
+ */
+void __init virt_init_IRQ(void)
+{
+ int i;
+
+ m68k_setup_irq_controller(&virt_irq_chip, handle_simple_irq, IRQ_USER,
+ NUM_VIRT_SOURCES - IRQ_USER);
+
+ for (i = 0; i < 6; i++) {
+ irq_set_chained_handler(virt_bi_data.pic.irq + i,
+ goldfish_pic_irq);
+ }
+
+ if (request_irq(IRQ_AUTO_7, virt_nmi_handler, 0, "NMI",
+ virt_nmi_handler))
+ pr_err("Couldn't register NMI\n");
+}
diff --git a/arch/m68k/virt/platform.c b/arch/m68k/virt/platform.c
new file mode 100644
index 000000000000..c16158e7a9ca
--- /dev/null
+++ b/arch/m68k/virt/platform.c
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <asm/virt.h>
+#include <asm/irq.h>
+
+#define VIRTIO_BUS_NB 128
+
+static int __init virt_virtio_init(int id)
+{
+ const struct resource res[] = {
+ DEFINE_RES_MEM(virt_bi_data.virtio.mmio + id * 0x200, 0x200),
+ DEFINE_RES_IRQ(virt_bi_data.virtio.irq + id),
+ };
+ struct platform_device *pdev;
+
+ pdev = platform_device_register_simple("virtio-mmio", id,
+ res, ARRAY_SIZE(res));
+ if (IS_ERR(pdev))
+ return PTR_ERR(pdev);
+
+ return 0;
+}
+
+static int __init virt_platform_init(void)
+{
+ const struct resource goldfish_tty_res[] = {
+ DEFINE_RES_MEM(virt_bi_data.tty.mmio, 1),
+ DEFINE_RES_IRQ(virt_bi_data.tty.irq),
+ };
+ /* this is the second gf-rtc, the first one is used by the scheduler */
+ const struct resource goldfish_rtc_res[] = {
+ DEFINE_RES_MEM(virt_bi_data.rtc.mmio + 0x1000, 0x1000),
+ DEFINE_RES_IRQ(virt_bi_data.rtc.irq + 1),
+ };
+ extern unsigned long min_low_pfn;
+ struct platform_device *pdev;
+ int i;
+
+ if (!MACH_IS_VIRT)
+ return -ENODEV;
+
+ /* We need this to have DMA'able memory provided to goldfish-tty */
+ min_low_pfn = 0;
+
+ pdev = platform_device_register_simple("goldfish_tty",
+ PLATFORM_DEVID_NONE,
+ goldfish_tty_res,
+ ARRAY_SIZE(goldfish_tty_res));
+ if (IS_ERR(pdev))
+ return PTR_ERR(pdev);
+
+ pdev = platform_device_register_simple("goldfish_rtc",
+ PLATFORM_DEVID_NONE,
+ goldfish_rtc_res,
+ ARRAY_SIZE(goldfish_rtc_res));
+ if (IS_ERR(pdev))
+ return PTR_ERR(pdev);
+
+ for (i = 0; i < VIRTIO_BUS_NB; i++) {
+ int err;
+
+ err = virt_virtio_init(i);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+arch_initcall(virt_platform_init);
--
2.34.1
在2022年1月13日一月 下午8:19，Laurent Vivier写道：
> As android implementation defines the endianness of the device is the one
> of the architecture replace all writel()/readl() by
> __raw_writel()/__raw_readl()
>
> https://android.googlesource.com/platform/external/qemu/+/refs/heads/emu-master-dev/hw/timer/goldfish_timer.c#177
>
> The same change has been done for goldfish-tty:
>
> commit da31de35cd2f ("tty: goldfish: use __raw_writel()/__raw_readl()")
>
> Signed-off-by: Laurent Vivier <[email protected]>
Acked-by: Jiauxn Yang <[email protected]>
Well I do think it's a mistake by Android. They only considered little endian as they only have little endian devices.
But given that the implementation is already a part of QEMU, we must live with that :-)
Thanks.
> ---
> drivers/rtc/rtc-goldfish.c | 30 +++++++++++++++---------------
> 1 file changed, 15 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/rtc/rtc-goldfish.c b/drivers/rtc/rtc-goldfish.c
> index 7ab95d052644..3e76160d40b9 100644
> --- a/drivers/rtc/rtc-goldfish.c
> +++ b/drivers/rtc/rtc-goldfish.c
> @@ -41,8 +41,8 @@ static int goldfish_rtc_read_alarm(struct device *dev,
> rtcdrv = dev_get_drvdata(dev);
> base = rtcdrv->base;
>
> - rtc_alarm_low = readl(base + TIMER_ALARM_LOW);
> - rtc_alarm_high = readl(base + TIMER_ALARM_HIGH);
> + rtc_alarm_low = __raw_readl(base + TIMER_ALARM_LOW);
> + rtc_alarm_high = __raw_readl(base + TIMER_ALARM_HIGH);
> rtc_alarm = (rtc_alarm_high << 32) | rtc_alarm_low;
>
> do_div(rtc_alarm, NSEC_PER_SEC);
> @@ -50,7 +50,7 @@ static int goldfish_rtc_read_alarm(struct device *dev,
>
> rtc_time64_to_tm(rtc_alarm, &alrm->time);
>
> - if (readl(base + TIMER_ALARM_STATUS))
> + if (__raw_readl(base + TIMER_ALARM_STATUS))
> alrm->enabled = 1;
> else
> alrm->enabled = 0;
> @@ -71,18 +71,18 @@ static int goldfish_rtc_set_alarm(struct device *dev,
>
> if (alrm->enabled) {
> rtc_alarm64 = rtc_tm_to_time64(&alrm->time) * NSEC_PER_SEC;
> - writel((rtc_alarm64 >> 32), base + TIMER_ALARM_HIGH);
> - writel(rtc_alarm64, base + TIMER_ALARM_LOW);
> - writel(1, base + TIMER_IRQ_ENABLED);
> + __raw_writel((rtc_alarm64 >> 32), base + TIMER_ALARM_HIGH);
> + __raw_writel(rtc_alarm64, base + TIMER_ALARM_LOW);
> + __raw_writel(1, base + TIMER_IRQ_ENABLED);
> } else {
> /*
> * if this function was called with enabled=0
> * then it could mean that the application is
> * trying to cancel an ongoing alarm
> */
> - rtc_status_reg = readl(base + TIMER_ALARM_STATUS);
> + rtc_status_reg = __raw_readl(base + TIMER_ALARM_STATUS);
> if (rtc_status_reg)
> - writel(1, base + TIMER_CLEAR_ALARM);
> + __raw_writel(1, base + TIMER_CLEAR_ALARM);
> }
>
> return 0;
> @@ -98,9 +98,9 @@ static int goldfish_rtc_alarm_irq_enable(struct device *dev,
> base = rtcdrv->base;
>
> if (enabled)
> - writel(1, base + TIMER_IRQ_ENABLED);
> + __raw_writel(1, base + TIMER_IRQ_ENABLED);
> else
> - writel(0, base + TIMER_IRQ_ENABLED);
> + __raw_writel(0, base + TIMER_IRQ_ENABLED);
>
> return 0;
> }
> @@ -110,7 +110,7 @@ static irqreturn_t goldfish_rtc_interrupt(int irq,
> void *dev_id)
> struct goldfish_rtc *rtcdrv = dev_id;
> void __iomem *base = rtcdrv->base;
>
> - writel(1, base + TIMER_CLEAR_INTERRUPT);
> + __raw_writel(1, base + TIMER_CLEAR_INTERRUPT);
>
> rtc_update_irq(rtcdrv->rtc, 1, RTC_IRQF | RTC_AF);
>
> @@ -128,8 +128,8 @@ static int goldfish_rtc_read_time(struct device
> *dev, struct rtc_time *tm)
> rtcdrv = dev_get_drvdata(dev);
> base = rtcdrv->base;
>
> - time_low = readl(base + TIMER_TIME_LOW);
> - time_high = readl(base + TIMER_TIME_HIGH);
> + time_low = __raw_readl(base + TIMER_TIME_LOW);
> + time_high = __raw_readl(base + TIMER_TIME_HIGH);
> time = (time_high << 32) | time_low;
>
> do_div(time, NSEC_PER_SEC);
> @@ -149,8 +149,8 @@ static int goldfish_rtc_set_time(struct device
> *dev, struct rtc_time *tm)
> base = rtcdrv->base;
>
> now64 = rtc_tm_to_time64(tm) * NSEC_PER_SEC;
> - writel((now64 >> 32), base + TIMER_TIME_HIGH);
> - writel(now64, base + TIMER_TIME_LOW);
> + __raw_writel((now64 >> 32), base + TIMER_TIME_HIGH);
> + __raw_writel(now64, base + TIMER_TIME_LOW);
>
> return 0;
> }
> --
> 2.34.1
--
- Jiaxun
Hi Laurent,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on geert-m68k/for-next]
[also build test WARNING on linux/master v5.16]
[cannot apply to tip/timers/core linus/master next-20220113]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Laurent-Vivier/m68k-Add-Virtual-M68k-Machine/20220114-042103
base: https://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k.git for-next
config: s390-allmodconfig (https://download.01.org/0day-ci/archive/20220114/[email protected]/config)
compiler: s390-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/0day-ci/linux/commit/7e887e6ec0d7193083a2f0020007688db2318c76
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Laurent-Vivier/m68k-Add-Virtual-M68k-Machine/20220114-042103
git checkout 7e887e6ec0d7193083a2f0020007688db2318c76
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=s390 SHELL=/bin/bash drivers/clocksource/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email protected]>
All warnings (new ones prefixed by >>):
drivers/clocksource/timer-goldfish.c: In function 'goldfish_timer_init':
drivers/clocksource/timer-goldfish.c:94:20: error: implicit declaration of function 'kzalloc'; did you mean 'vzalloc'? [-Werror=implicit-function-declaration]
94 | timerdrv = kzalloc(sizeof(*timerdrv), GFP_KERNEL);
| ^~~~~~~
| vzalloc
>> drivers/clocksource/timer-goldfish.c:94:18: warning: assignment to 'struct goldfish_timer *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
94 | timerdrv = kzalloc(sizeof(*timerdrv), GFP_KERNEL);
| ^
cc1: some warnings being treated as errors
Kconfig warnings: (for reference only)
WARNING: unmet direct dependencies detected for RTC_CLASS
Depends on !S390
Selected by
- GOLDFISH_TIMER && GENERIC_CLOCKEVENTS
WARNING: unmet direct dependencies detected for RTC_DRV_GOLDFISH
Depends on RTC_CLASS && HAS_IOMEM
Selected by
- GOLDFISH_TIMER && GENERIC_CLOCKEVENTS
vim +94 drivers/clocksource/timer-goldfish.c
88
89 void __init goldfish_timer_init(int irq, void __iomem *base)
90 {
91 struct goldfish_timer *timerdrv;
92 int ret;
93
> 94 timerdrv = kzalloc(sizeof(*timerdrv), GFP_KERNEL);
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[email protected]
On Thu, Jan 13, 2022 at 9:19 PM Laurent Vivier <[email protected]> wrote:
>
> As android implementation defines the endianness of the device is the one
> of the architecture replace all writel()/readl() by
> __raw_writel()/__raw_readl()
>
> https://android.googlesource.com/platform/external/qemu/+/refs/heads/emu-master-dev/hw/timer/goldfish_timer.c#177
>
> The same change has been done for goldfish-tty:
>
> commit da31de35cd2f ("tty: goldfish: use __raw_writel()/__raw_readl()")
>
> Signed-off-by: Laurent Vivier <[email protected]>
__raw_readl() isn't really the correct interface though, this is not
well-defined to have
a particular meaning at all, and doesn't guarantee atomicity or a
particular endianess
across architectures.
I'd suggest defining a set of goldfish specific accessors per
architecture that turn
into either readl() or swabl(readl()), to allow future architectures
to define this
properly in qemu.
Arnd
Hi Laurent,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on geert-m68k/for-next]
[also build test ERROR on linux/master v5.16]
[cannot apply to tip/timers/core linus/master next-20220114]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Laurent-Vivier/m68k-Add-Virtual-M68k-Machine/20220114-042103
base: https://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k.git for-next
config: s390-allmodconfig (https://download.01.org/0day-ci/archive/20220114/[email protected]/config)
compiler: s390-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/0day-ci/linux/commit/7e887e6ec0d7193083a2f0020007688db2318c76
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Laurent-Vivier/m68k-Add-Virtual-M68k-Machine/20220114-042103
git checkout 7e887e6ec0d7193083a2f0020007688db2318c76
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=s390 SHELL=/bin/bash drivers/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email protected]>
All errors (new ones prefixed by >>):
drivers/clocksource/timer-goldfish.c: In function 'goldfish_timer_init':
>> drivers/clocksource/timer-goldfish.c:94:20: error: implicit declaration of function 'kzalloc'; did you mean 'vzalloc'? [-Werror=implicit-function-declaration]
94 | timerdrv = kzalloc(sizeof(*timerdrv), GFP_KERNEL);
| ^~~~~~~
| vzalloc
drivers/clocksource/timer-goldfish.c:94:18: warning: assignment to 'struct goldfish_timer *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
94 | timerdrv = kzalloc(sizeof(*timerdrv), GFP_KERNEL);
| ^
cc1: some warnings being treated as errors
Kconfig warnings: (for reference only)
WARNING: unmet direct dependencies detected for RTC_CLASS
Depends on !S390
Selected by
- GOLDFISH_TIMER && GENERIC_CLOCKEVENTS
WARNING: unmet direct dependencies detected for RTC_DRV_GOLDFISH
Depends on RTC_CLASS && HAS_IOMEM
Selected by
- GOLDFISH_TIMER && GENERIC_CLOCKEVENTS
vim +94 drivers/clocksource/timer-goldfish.c
88
89 void __init goldfish_timer_init(int irq, void __iomem *base)
90 {
91 struct goldfish_timer *timerdrv;
92 int ret;
93
> 94 timerdrv = kzalloc(sizeof(*timerdrv), GFP_KERNEL);
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[email protected]
On Thu, Jan 13, 2022 at 9:19 PM Laurent Vivier <[email protected]> wrote:
>
> Add a clocksource based on the goldfish-rtc device.
>
> Signed-off-by: Laurent Vivier <[email protected]>
> ---
> drivers/clocksource/Kconfig | 7 ++
> drivers/clocksource/Makefile | 1 +
> drivers/clocksource/timer-goldfish.c | 130 +++++++++++++++++++++++++++
> include/clocksource/timer-goldfish.h | 12 +++
> 4 files changed, 150 insertions(+)
> create mode 100644 drivers/clocksource/timer-goldfish.c
> create mode 100644 include/clocksource/timer-goldfish.h
>
> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
> index f65e31bab9ae..6ca9bb78407d 100644
> --- a/drivers/clocksource/Kconfig
> +++ b/drivers/clocksource/Kconfig
> @@ -711,4 +711,11 @@ config MICROCHIP_PIT64B
> modes and high resolution. It is used as a clocksource
> and a clockevent.
>
> +config GOLDFISH_TIMER
> + bool "Clocksource using goldfish-rtc"
> + select RTC_CLASS
> + select RTC_DRV_GOLDFISH
This should probably be
depends on M68K || COMPILE_TEST
depends on RTC_DRV_GOLDFISH
A driver should never 'select' another user-selectable subsystem
> +static int goldfish_timer_set_oneshot(struct clock_event_device *evt)
> +{
> + struct goldfish_timer *timerdrv = ced_to_gf(evt);
> + void __iomem *base = timerdrv->base;
> +
> + __raw_writel(0, base + TIMER_ALARM_HIGH);
> + __raw_writel(0, base + TIMER_ALARM_LOW);
> + __raw_writel(1, base + TIMER_IRQ_ENABLED);
As mentioned elsewhere, the __raw_* accessors are not portable, please
use readl()/writel() here, or possibly ioread32_be()/iowrite32_be() for
the big-endian variant.
> +EXPORT_SYMBOL_GPL(goldfish_timer_init);
No need to export this if the only callers are in the kernel.
Arnd
Le 14/01/2022 à 11:46, Arnd Bergmann a écrit :
> On Thu, Jan 13, 2022 at 9:19 PM Laurent Vivier <[email protected]> wrote:
>>
>> Add a clocksource based on the goldfish-rtc device.
>>
>> Signed-off-by: Laurent Vivier <[email protected]>
>> ---
>> drivers/clocksource/Kconfig | 7 ++
>> drivers/clocksource/Makefile | 1 +
>> drivers/clocksource/timer-goldfish.c | 130 +++++++++++++++++++++++++++
>> include/clocksource/timer-goldfish.h | 12 +++
>> 4 files changed, 150 insertions(+)
>> create mode 100644 drivers/clocksource/timer-goldfish.c
>> create mode 100644 include/clocksource/timer-goldfish.h
>>
>> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
>> index f65e31bab9ae..6ca9bb78407d 100644
>> --- a/drivers/clocksource/Kconfig
>> +++ b/drivers/clocksource/Kconfig
>> @@ -711,4 +711,11 @@ config MICROCHIP_PIT64B
>> modes and high resolution. It is used as a clocksource
>> and a clockevent.
>>
>> +config GOLDFISH_TIMER
>> + bool "Clocksource using goldfish-rtc"
>> + select RTC_CLASS
>> + select RTC_DRV_GOLDFISH
>
> This should probably be
>
> depends on M68K || COMPILE_TEST
> depends on RTC_DRV_GOLDFISH
>
> A driver should never 'select' another user-selectable subsystem
ok
>
>> +static int goldfish_timer_set_oneshot(struct clock_event_device *evt)
>> +{
>> + struct goldfish_timer *timerdrv = ced_to_gf(evt);
>> + void __iomem *base = timerdrv->base;
>> +
>> + __raw_writel(0, base + TIMER_ALARM_HIGH);
>> + __raw_writel(0, base + TIMER_ALARM_LOW);
>> + __raw_writel(1, base + TIMER_IRQ_ENABLED);
>
> As mentioned elsewhere, the __raw_* accessors are not portable, please
> use readl()/writel() here, or possibly ioread32_be()/iowrite32_be() for
> the big-endian variant.
We can't use readl()/writel() here because it's supposed to read from a little endian device, and
goldfish endianness depends on the endianness of the machine.
For goldfish, readl()/writel() works fine on little-endian machine but not on big-endian machine.
On m68k, you have:
#define readl(addr) in_le32(addr)
#define writel(val,addr) out_le32((addr),(val))
and with goldfish it's wrong as the device is not little-endian, it is big-endian like the machine.
same comment with ioread32_be()/iowrite32_be(): it will work on big-endian machine not on little-endian.
We need an accessor that doesn't byteswap the value, that accesses it natively, and in all other
parts of the kernel __raw_writel() and __raw_readl() are used.
Thanks,
Laurent
Hi Laurent!
On 1/13/22 21:19, Laurent Vivier wrote:
> As android implementation defines the endianness of the device is the one
> of the architecture replace all writel()/readl() by
> __raw_writel()/__raw_readl()
I think this sentence is a little hard to understand. Can you rephrase it in
case you are sending another version of the series?
Adrian
--
.''`. John Paul Adrian Glaubitz
: :' : Debian Developer - [email protected]
`. `' Freie Universitaet Berlin - [email protected]
`- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
Hi Laurent,
On Fri, Jan 14, 2022 at 12:03 PM Laurent Vivier <[email protected]> wrote:
> Le 14/01/2022 à 11:46, Arnd Bergmann a écrit :
> > On Thu, Jan 13, 2022 at 9:19 PM Laurent Vivier <[email protected]> wrote:
> >> +static int goldfish_timer_set_oneshot(struct clock_event_device *evt)
> >> +{
> >> + struct goldfish_timer *timerdrv = ced_to_gf(evt);
> >> + void __iomem *base = timerdrv->base;
> >> +
> >> + __raw_writel(0, base + TIMER_ALARM_HIGH);
> >> + __raw_writel(0, base + TIMER_ALARM_LOW);
> >> + __raw_writel(1, base + TIMER_IRQ_ENABLED);
> >
> > As mentioned elsewhere, the __raw_* accessors are not portable, please
> > use readl()/writel() here, or possibly ioread32_be()/iowrite32_be() for
> > the big-endian variant.
>
> We can't use readl()/writel() here because it's supposed to read from a little endian device, and
> goldfish endianness depends on the endianness of the machine.
>
> For goldfish, readl()/writel() works fine on little-endian machine but not on big-endian machine.
>
> On m68k, you have:
>
> #define readl(addr) in_le32(addr)
> #define writel(val,addr) out_le32((addr),(val))
>
> and with goldfish it's wrong as the device is not little-endian, it is big-endian like the machine.
>
> same comment with ioread32_be()/iowrite32_be(): it will work on big-endian machine not on little-endian.
>
> We need an accessor that doesn't byteswap the value, that accesses it natively, and in all other
> parts of the kernel __raw_writel() and __raw_readl() are used.
Hence Arnd's suggestion to define custom accessors in the Goldfish
RTC driver, that map to {read,write}l() on little-endian, and to
io{read,write}32_be() on big-endian.
BTW, I'd go for io{read,write}32() on little endian instead, for
symmetry.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
Le 14/01/2022 à 12:12, Geert Uytterhoeven a écrit :
> Hi Laurent,
>
> On Fri, Jan 14, 2022 at 12:03 PM Laurent Vivier <[email protected]> wrote:
>> Le 14/01/2022 à 11:46, Arnd Bergmann a écrit :
>>> On Thu, Jan 13, 2022 at 9:19 PM Laurent Vivier <[email protected]> wrote:
>>>> +static int goldfish_timer_set_oneshot(struct clock_event_device *evt)
>>>> +{
>>>> + struct goldfish_timer *timerdrv = ced_to_gf(evt);
>>>> + void __iomem *base = timerdrv->base;
>>>> +
>>>> + __raw_writel(0, base + TIMER_ALARM_HIGH);
>>>> + __raw_writel(0, base + TIMER_ALARM_LOW);
>>>> + __raw_writel(1, base + TIMER_IRQ_ENABLED);
>>>
>>> As mentioned elsewhere, the __raw_* accessors are not portable, please
>>> use readl()/writel() here, or possibly ioread32_be()/iowrite32_be() for
>>> the big-endian variant.
>>
>> We can't use readl()/writel() here because it's supposed to read from a little endian device, and
>> goldfish endianness depends on the endianness of the machine.
>>
>> For goldfish, readl()/writel() works fine on little-endian machine but not on big-endian machine.
>>
>> On m68k, you have:
>>
>> #define readl(addr) in_le32(addr)
>> #define writel(val,addr) out_le32((addr),(val))
>>
>> and with goldfish it's wrong as the device is not little-endian, it is big-endian like the machine.
>>
>> same comment with ioread32_be()/iowrite32_be(): it will work on big-endian machine not on little-endian.
>>
>> We need an accessor that doesn't byteswap the value, that accesses it natively, and in all other
>> parts of the kernel __raw_writel() and __raw_readl() are used.
>
> Hence Arnd's suggestion to define custom accessors in the Goldfish
> RTC driver, that map to {read,write}l() on little-endian, and to
> io{read,write}32_be() on big-endian.
>
> BTW, I'd go for io{read,write}32() on little endian instead, for
> symmetry.
You mean something like that:
#ifdef CONFIG_CPU_BIG_ENDIAN
#define raw_ioread32 ioread32be
#define raw_iowrite32 iowrite32be
#else
#define raw_ioread32 ioread32
#define raw_iowrite32 iowrite32
#endif
and then use raw_ioread32()/raw_iowrite32() rather than readl()/writel()?
Thanks,
Laurent
Hi Laurent,
On Fri, Jan 14, 2022 at 12:31 PM Laurent Vivier <[email protected]> wrote:
> Le 14/01/2022 à 12:12, Geert Uytterhoeven a écrit :
> > On Fri, Jan 14, 2022 at 12:03 PM Laurent Vivier <[email protected]> wrote:
> >> Le 14/01/2022 à 11:46, Arnd Bergmann a écrit :
> >>> On Thu, Jan 13, 2022 at 9:19 PM Laurent Vivier <[email protected]> wrote:
> >>>> +static int goldfish_timer_set_oneshot(struct clock_event_device *evt)
> >>>> +{
> >>>> + struct goldfish_timer *timerdrv = ced_to_gf(evt);
> >>>> + void __iomem *base = timerdrv->base;
> >>>> +
> >>>> + __raw_writel(0, base + TIMER_ALARM_HIGH);
> >>>> + __raw_writel(0, base + TIMER_ALARM_LOW);
> >>>> + __raw_writel(1, base + TIMER_IRQ_ENABLED);
> >>>
> >>> As mentioned elsewhere, the __raw_* accessors are not portable, please
> >>> use readl()/writel() here, or possibly ioread32_be()/iowrite32_be() for
> >>> the big-endian variant.
> >>
> >> We can't use readl()/writel() here because it's supposed to read from a little endian device, and
> >> goldfish endianness depends on the endianness of the machine.
> >>
> >> For goldfish, readl()/writel() works fine on little-endian machine but not on big-endian machine.
> >>
> >> On m68k, you have:
> >>
> >> #define readl(addr) in_le32(addr)
> >> #define writel(val,addr) out_le32((addr),(val))
> >>
> >> and with goldfish it's wrong as the device is not little-endian, it is big-endian like the machine.
> >>
> >> same comment with ioread32_be()/iowrite32_be(): it will work on big-endian machine not on little-endian.
> >>
> >> We need an accessor that doesn't byteswap the value, that accesses it natively, and in all other
> >> parts of the kernel __raw_writel() and __raw_readl() are used.
> >
> > Hence Arnd's suggestion to define custom accessors in the Goldfish
> > RTC driver, that map to {read,write}l() on little-endian, and to
> > io{read,write}32_be() on big-endian.
> >
> > BTW, I'd go for io{read,write}32() on little endian instead, for
> > symmetry.
>
> You mean something like that:
>
> #ifdef CONFIG_CPU_BIG_ENDIAN
> #define raw_ioread32 ioread32be
> #define raw_iowrite32 iowrite32be
> #else
> #define raw_ioread32 ioread32
> #define raw_iowrite32 iowrite32
> #endif
>
> and then use raw_ioread32()/raw_iowrite32() rather than readl()/writel()?
Exactly.
You may want to use names that have less chance of conflicting in
the future, e.g. goldfish_{read,write}().
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds