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| author | Johannes Berg <johannes.berg@intel.com> | 2020-02-13 14:26:48 +0100 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2020-03-29 23:29:52 +0200 |
| commit | 0bc8fb4dda2b461491ec567b2333d13897780d8c (patch) | |
| tree | ced5713f42b176386f212534ecf07822088d3709 /arch/um/include/asm/delay.h | |
| parent | 88ce642492339f49a0b391af40e5798c08948e49 (diff) | |
| download | linux-0bc8fb4dda2b461491ec567b2333d13897780d8c.tar.gz linux-0bc8fb4dda2b461491ec567b2333d13897780d8c.tar.bz2 linux-0bc8fb4dda2b461491ec567b2333d13897780d8c.zip | |
um: Implement ndelay/udelay in time-travel mode
In external or inf-cpu time-travel mode, ndelay/udelay currently
just waste CPU time since the simulation time doesn't advance.
Implement them properly in this case.
Note that the "if (time_travel_mode == ...)" parts compile out
if CONFIG_UML_TIME_TRAVEL_SUPPORT isn't set, time_travel_mode is
defined to TT_MODE_OFF in that case.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um/include/asm/delay.h')
| -rw-r--r-- | arch/um/include/asm/delay.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/um/include/asm/delay.h b/arch/um/include/asm/delay.h new file mode 100644 index 000000000000..56fc2b8f2dd0 --- /dev/null +++ b/arch/um/include/asm/delay.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __UM_DELAY_H +#define __UM_DELAY_H +#include <asm-generic/delay.h> +#include <linux/time-internal.h> + +static inline void um_ndelay(unsigned long nsecs) +{ + if (time_travel_mode == TT_MODE_INFCPU || + time_travel_mode == TT_MODE_EXTERNAL) { + time_travel_ndelay(nsecs); + return; + } + ndelay(nsecs); +} +#undef ndelay +#define ndelay um_ndelay + +static inline void um_udelay(unsigned long usecs) +{ + if (time_travel_mode == TT_MODE_INFCPU || + time_travel_mode == TT_MODE_EXTERNAL) { + time_travel_ndelay(1000 * usecs); + return; + } + udelay(usecs); +} +#undef udelay +#define udelay um_udelay +#endif /* __UM_DELAY_H */ |