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Joel Holdsworth 3eb43aeb16 hw/openrisc: Fixed undercounting of TTCR in continuous mode 
In the existing design, TTCR is prone to undercounting when running in
continuous mode. This manifests as a timer interrupt appearing to
trigger a few cycles prior to the deadline set in SPR_TTMR_TP.

When the timer triggers, the virtual time delta in nanoseconds between
the time when the timer was set, and when it triggers is calculated.
This nanoseconds value is then divided by TIMER_PERIOD (50) to compute
an increment of cycles to apply to TTCR.

However, this calculation rounds down the number of cycles causing the
undercounting.

A simplistic solution would be to instead round up the number of cycles,
however this will result in the accumulation of timing error over time.

This patch corrects the issue by calculating the time delta in
nanoseconds between when the timer was last reset and the timer event.
This approach allows the TTCR value to be rounded up, but without
accumulating error over time.

Signed-off-by: Joel Holdsworth <jholdsworth@nvidia.com>
[stafford: Incremented version in vmstate_or1k_timer, checkpatch fixes]
Signed-off-by: Stafford Horne <shorne@gmail.com>
2024-12-03 10:59:25 +00:00
..
9pfs 9pfs: fix crash on 'Treaddir' request 2024-11-08 10:38:12 +01:00
acpi hw/acpi: Update GED with vCPU Hotplug VMSD for migration 2024-11-04 16:03:25 -05:00
adc hw/adc: Remove MAX111X device 2024-10-15 15:16:17 +01:00
alpha alpha: switch boards to "default y" 2024-05-03 15:47:47 +02:00
arm virtio,pc,pci: features, fixes, cleanups 2024-11-05 15:47:52 +00:00
audio replace error_setg(&error_fatal, ...) with error_report() 2024-10-21 22:40:47 +03:00
avr avr: switch boards to "default y" 2024-05-03 15:47:47 +02:00
block Misc HW patch queue 2024-11-06 17:28:45 +00:00
char hw/char/sifive_uart: Fix broken UART on big endian hosts 2024-11-07 08:16:53 +10:00
core eif: cope with huge section sizes 2024-11-09 08:34:00 +01:00
cpu hw: Add a Kconfig switch for the TYPE_CPU_CLUSTER device 2024-04-25 12:48:12 +02:00
cxl hw/cxl: Ensure there is enough data to read the input header in cmd_get_physical_port_state() 2024-11-04 16:03:25 -05:00
display virtio-gpu: Support Venus context 2024-10-28 16:56:36 +00:00
dma hw/dma: Remove omap_dma4 device 2024-10-01 14:58:07 +01:00
fsi hw: Use device_class_set_legacy_reset() instead of opencoding 2024-09-13 15:31:44 +01:00
gpio hw/gpio/mpc8xxx: Prefer DEFINE_TYPES() macro 2024-11-05 23:32:25 +00:00
hppa hw/char: Extract serial-mm 2024-10-03 19:33:23 +02:00
hyperv hw/hyperv: remove return after g_assert_not_reached() 2024-09-24 13:53:35 +02:00
i2c hw/i2c/smbus_eeprom: Prefer DEFINE_TYPES() macro 2024-11-05 23:32:25 +00:00
i386 hw/i386/pc: Don't try to init PCI NICs if there is no PCI bus 2024-11-09 08:34:07 +01:00
ide hw/ide: Remove DSCM-1XXXX microdrive device model 2024-10-15 15:16:17 +01:00
input hw/input: Remove lm832x device 2024-10-01 14:41:10 +01:00
intc pnv/xive2: TIMA CI ops using alternative offsets or byte lengths 2024-11-04 09:14:54 +10:00
ipack hw/ipack: Constify VMState 2023-12-29 11:17:30 +11:00
ipmi hw/ipmi: Constify VMState 2023-12-29 11:17:30 +11:00
isa hw/char/serial.h: Extract serial-isa.h 2024-10-03 19:33:23 +02:00
loongarch hw/loongarch/boot: Use warn_report when no kernel filename 2024-11-02 15:20:41 +08:00
m68k next-kbd: convert to use qemu_input_handler_register() 2024-11-08 11:05:55 +01:00
mem hw/cxl/cxl-mailbox-utils: Fix for device DDR5 ECS control feature tables 2024-11-04 16:03:24 -05:00
microblaze hw/microblaze/s3adsp1800: Declare machine type using DEFINE_TYPES macro 2024-11-05 23:32:13 +00:00
mips hw/mips: Have mips_cpu_create_with_clock() take an endianness argument 2024-10-15 12:21:06 -03:00
misc hw/misc/aspeed_hace: Fix SG Accumulative hashing 2024-10-24 07:57:47 +02:00
net Misc HW patch queue 2024-11-06 17:28:45 +00:00
nubus hw/nubus/nubus-device: Range check 'slot' property 2024-09-08 11:49:49 +02:00
nvme hw/nvme: fix handling of over-committed queues 2024-11-08 09:14:30 +01:00
nvram hw: Remove unused fw_cfg_init_io 2024-10-03 17:26:06 +03:00
openrisc hw/openrisc: Fixed undercounting of TTCR in continuous mode 2024-12-03 10:59:25 +00:00
pci pcie: enable Extended tag field support 2024-11-04 16:03:25 -05:00
pci-bridge hw/pci-bridge: Make pxb_dev_realize_common() return if it succeeded 2024-11-04 16:03:25 -05:00
pci-host Misc HW patch queue 2024-11-06 17:28:45 +00:00
ppc hw/ppc/mpc8544_guts: Prefer DEFINE_TYPES() macro 2024-11-05 23:32:25 +00:00
remote remote: Remove unused remote_iohub_finalize 2024-10-03 17:26:06 +03:00
riscv hw/riscv/riscv-iommu: fix riscv_iommu_validate_process_ctx() check 2024-11-07 08:19:39 +10:00
rtc Misc HW patch queue 2024-11-06 17:28:45 +00:00
rx kconfig: express dependency of individual boards on libfdt 2024-05-10 15:45:15 +02:00
s390x hw/s390x: Re-enable the pci-bridge device on s390x 2024-11-04 14:16:11 +01:00
scsi hw/vhost-scsi: fix -Werror=maybe-uninitialized 2024-10-02 16:14:29 +04:00
sd hw/sd/sdhci: Prefer DEFINE_TYPES() macro 2024-11-05 23:32:25 +00:00
sensor hw/sensor/tmp105: Convert printf() to trace event, add tracing for read/write access 2024-11-05 10:10:00 +00:00
sh4 Revert "hw/sh4/r2d: Realize IDE controller before accessing it" 2024-10-21 16:40:11 +02:00
smbios smbios: make memory device size configurable per Machine 2024-07-22 20:15:41 -04:00
sparc hw: Use device_class_set_legacy_reset() instead of opencoding 2024-09-13 15:31:44 +01:00
sparc64 hw/char: Extract serial-mm 2024-10-03 19:33:23 +02:00
ssi hw/ssi/pnv_spi: Fixes Coverity CID 1558831 2024-11-04 09:09:15 +10:00
timer target-arm queue: 2024-11-05 21:27:18 +00:00
tpm hw/tpm: remove break after g_assert_not_reached() 2024-09-24 13:53:35 +02:00
tricore hw: Use device_class_set_legacy_reset() instead of opencoding 2024-09-13 15:31:44 +01:00
ufs hw/ufs: minor bug fixes related to ufs-test 2024-09-06 18:04:16 +09:00
usb hw/usb/hcd-ehci-sysbus: Prefer DEFINE_TYPES() macro 2024-11-05 23:32:25 +00:00
vfio vfio/migration: Add vfio_save_block_precopy_empty_hit trace event 2024-11-05 15:51:14 +01:00
virtio virtio,pc,pci: features, fixes, cleanups 2024-11-05 15:47:52 +00:00
watchdog hw/watchdog/wdt_imx2: Remove redundant assignment 2024-11-05 10:10:00 +00:00
xen hw/xen: Avoid use of uninitialized bufioreq_evtchn 2024-10-21 07:53:21 +02:00
xenpv hw/xen: Register framebuffer backend via xen_backend_init() 2024-06-04 11:53:43 +02:00
xtensa hw/xtensa/xtfpga: Remove TARGET_BIG_ENDIAN #ifdef'ry 2024-10-15 12:13:59 -03:00
Kconfig hw: Remove PCMCIA subsystem 2024-10-15 15:16:17 +01:00
meson.build hw: Remove PCMCIA subsystem 2024-10-15 15:16:17 +01:00