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powerpc/xive: Add a debugfs toggle for save-restore

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On POWER10, the automatic "save & restore" of interrupt context is
always available. Provide a way to deactivate it for tests or
performance.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211105102636.1016378-11-clg@kaod.org
This commit is contained in:
Cédric Le Goater 2021-11-05 11:26:35 +01:00 • committed by Michael Ellerman
parent c21ee04f11
commit 1e7684dc4f
3 changed files with 3 additions and 1 deletions
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1
arch/powerpc/sysdev/xive/common.c
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@ -1847,6 +1847,7 @@ static void xive_core_debugfs_create(void)
&xive_eq_debug_fops); &xive_eq_debug_fops);
} }
debugfs_create_bool("store-eoi", 0600, xive_dir, &xive_store_eoi); debugfs_create_bool("store-eoi", 0600, xive_dir, &xive_store_eoi);
debugfs_create_bool("save-restore", 0600, xive_dir, &xive_has_save_restore);
} }
#else #else
static inline void xive_core_debugfs_create(void) { } static inline void xive_core_debugfs_create(void) { }

2
arch/powerpc/sysdev/xive/native.c
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@ -41,7 +41,7 @@ static u32 xive_queue_shift;
static u32 xive_pool_vps = XIVE_INVALID_VP; static u32 xive_pool_vps = XIVE_INVALID_VP;
static struct kmem_cache *xive_provision_cache; static struct kmem_cache *xive_provision_cache;
static bool xive_has_single_esc; static bool xive_has_single_esc;
static bool xive_has_save_restore; bool xive_has_save_restore;
int xive_native_populate_irq_data(u32 hw_irq, struct xive_irq_data *data) int xive_native_populate_irq_data(u32 hw_irq, struct xive_irq_data *data)
{ {

1
arch/powerpc/sysdev/xive/xive-internal.h
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@ -72,5 +72,6 @@ static inline u32 xive_alloc_order(u32 queue_shift)
} }
extern bool xive_cmdline_disabled; extern bool xive_cmdline_disabled;
extern bool xive_has_save_restore;
#endif /* __XIVE_INTERNAL_H */ #endif /* __XIVE_INTERNAL_H */