kernel.git/arch/powerpc/include/asm/time.h, branch linux-5.16.y

KVM: PPC: Book3S HV P9: Reduce irq_work vs guest decrementer races

2021-06-10T12:12:13Z

irq_work's use of the DEC SPR is racy with guest<->host switch and guest entry which flips the DEC interrupt to guest, which could lose a host work interrupt. This patch closes one race, and attempts to comment another class of races. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210528090752.3542186-11-npiggin@gmail.com

powerpc/time: move timer_broadcast_interrupt prototype to asm/time.h

2021-02-08T13:02:10Z

Interrupt handler prototypes are going to be rearranged in a future patch, so tidy this out of the way first. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210130130852.2952424-21-npiggin@gmail.com

powerpc/time: Remove ifdef in get_vtb()

2020-12-03T14:01:32Z

SPRN_VTB and CPU_FTR_ARCH_207S are always defined, no need of an ifdef. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/a0fc81cd85121407726bcf480fc9a0d8e7617fce.1601549933.git.christophe.leroy@csgroup.eu

powerpc/time: Move timebase functions into new asm/vdso/timebase.h

2020-12-03T14:01:10Z

In order to easily use get_tb() from C VDSO, move timebase functions into a new header named asm/vdso/timebase.h Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20201126131006.2431205-3-mpe@ellerman.id.au

powerpc/time: Make get_tb() common to PPC32 and PPC64

2020-10-08T10:17:16Z

mftbu() is always defined now, so the #ifdef can be removed and replaced by an IS_ENABLED(CONFIG_PPC64) inside the PPC32 version of get_tb(). Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/47e49717d2643169ffcbe5d507f184cf49f0fe95.1601556145.git.christophe.leroy@csgroup.eu

powerpc/time: Make get_tbl() common to PPC32 and PPC64

2020-10-08T10:17:16Z

On PPC64, get_tbl() is defined as an alias of get_tb() which return the result of mftb(). That exactly the same as what the PPC32 version does. We don't need two versions. Remove the PPC64 definition of get_tbl() and use the PPC32 version for both. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/a8eaabb87d69534e533ebac805163e08146e05bd.1601556145.git.christophe.leroy@csgroup.eu

powerpc/time: Remove get_tbu()

2020-10-08T10:17:15Z

get_tbu() is redundant with mftbu() and is not used anymore. Remove it. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/1746e2d11ea90c3f45877e1fcc6c79ce96cf6b98.1601556145.git.christophe.leroy@csgroup.eu

powerpc/time: Avoid using get_tbl() and get_tbu() internally

2020-10-08T10:17:15Z

get_tbl() is confusing as it returns the content of TBL register on PPC32 but the concatenation of TBL and TBU on PPC64. Use mftb() instead. Do the same with get_tbu() for consistency allthough it's name is less confusing. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/41573406a4eab98838decaa91649086fef1e6119.1601556145.git.christophe.leroy@csgroup.eu

powerpc/time: Rename mftbl() to mftb()

2020-10-08T10:17:15Z

On PPC64, we have mftb(). On PPC32, we have mftbl() and an #define mftb() mftbl(). mftb() and mftbl() are equivalent, their purpose is to read the content of SPRN_TRBL, as returned by 'mftb' simplified instruction. binutils seems to define 'mftbl' instruction as an equivalent of 'mftb'. However in both 32 bits and 64 bits documentation, only 'mftb' is defined, and when performing a disassembly with objdump, the displayed instruction is 'mftb' No need to have two ways to do the same thing with different names, rename mftbl() to have only mftb(). Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/94dc68d3d9ef9eb549796d4b938b6ba0305a049b.1601556145.git.christophe.leroy@csgroup.eu

powerpc/time: Remove ifdef in get_dec() and set_dec()

2020-10-08T10:17:14Z

Move SPRN_PIT definition in reg.h. This allows to remove ifdef in get_dec() and set_dec() and makes them more readable. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/3c9a6eb0fc040868ac59be66f338d08fd017668d.1601549945.git.christophe.leroy@csgroup.eu