Commit 279f2259 authored by James Morse's avatar James Morse Committed by Borislav Petkov (AMD)
Browse files

x86/resctrl: Move pseudo lock prototypes to include/linux/resctrl.h 



The resctrl pseudo-lock feature allows an architecture to allocate data
into particular cache portions, which are then treated as reserved to
avoid that data ever being evicted. Setting this up is deeply architecture
specific as it involves disabling prefetchers etc. It is not possible
to support this kind of feature on arm64. Risc-V is assumed to be the
same.

The prototypes for the architecture code were added to x86's asm/resctrl.h,
with other architectures able to provide stubs for their architecture. This
forces other architectures to provide identical stubs.

Move the prototypes and stubs to linux/resctrl.h, and switch between them
using the existing Kconfig symbol.

Signed-off-by: default avatarJames Morse <james.morse@arm.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: default avatarReinette Chatre <reinette.chatre@intel.com>
Reviewed-by: default avatarFenghua Yu <fenghuay@nvidia.com>
Tested-by: default avatarFenghua Yu <fenghuay@nvidia.com>
Tested-by: default avatarBabu Moger <babu.moger@amd.com>
Tested-by: default avatarShaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: default avatarTony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-20-james.morse@arm.com
parent 272ed1c2

arch/x86/include/asm/resctrl.h

+0 −5
Original line number Diff line number Diff line
@@ -205,11 +205,6 @@ static inline void resctrl_arch_mon_ctx_free(struct rdt_resource *r, 
					     enum resctrl_event_id evtid,

					     void *ctx) { }



u64 resctrl_arch_get_prefetch_disable_bits(void);

int resctrl_arch_pseudo_lock_fn(void *_plr);

int resctrl_arch_measure_cycles_lat_fn(void *_plr);

int resctrl_arch_measure_l2_residency(void *_plr);

int resctrl_arch_measure_l3_residency(void *_plr);

void resctrl_cpu_detect(struct cpuinfo_x86 *c);



#else

include/linux/resctrl.h

+13 −0
Original line number Diff line number Diff line
@@ -534,4 +534,17 @@ extern unsigned int resctrl_rmid_realloc_limit; 
int resctrl_init(void);

void resctrl_exit(void);



#ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK

u64 resctrl_arch_get_prefetch_disable_bits(void);

int resctrl_arch_pseudo_lock_fn(void *_plr);

int resctrl_arch_measure_cycles_lat_fn(void *_plr);

int resctrl_arch_measure_l2_residency(void *_plr);

int resctrl_arch_measure_l3_residency(void *_plr);

#else

static inline u64 resctrl_arch_get_prefetch_disable_bits(void) { return 0; }

static inline int resctrl_arch_pseudo_lock_fn(void *_plr) { return 0; }

static inline int resctrl_arch_measure_cycles_lat_fn(void *_plr) { return 0; }

static inline int resctrl_arch_measure_l2_residency(void *_plr) { return 0; }

static inline int resctrl_arch_measure_l3_residency(void *_plr) { return 0; }

#endif /* CONFIG_RESCTRL_FS_PSEUDO_LOCK */

#endif /* _RESCTRL_H */