[POWERPC] Add DSCR SPR to sysfs
POWER6 adds a new SPR, the data stream control register (DSCR). It can be used to adjust how agressive the prefetch mechanisms are. Its possible we may want to context switch this, but for now just export it to userspace via sysfs so we can adjust it. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
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396a1a5832
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4c198557c6
3 changed files with 13 additions and 2 deletions
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@ -181,6 +181,7 @@ SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
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SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
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SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
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SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
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SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
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SYSFS_PMCSETUP(purr, SPRN_PURR);
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SYSFS_PMCSETUP(purr, SPRN_PURR);
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SYSFS_PMCSETUP(dscr, SPRN_DSCR);
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static SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0);
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static SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0);
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static SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1);
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static SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1);
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@ -194,6 +195,7 @@ static SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6);
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static SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7);
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static SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7);
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static SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8);
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static SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8);
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static SYSDEV_ATTR(purr, 0600, show_purr, NULL);
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static SYSDEV_ATTR(purr, 0600, show_purr, NULL);
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static SYSDEV_ATTR(dscr, 0600, show_dscr, store_dscr);
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static void register_cpu_online(unsigned int cpu)
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static void register_cpu_online(unsigned int cpu)
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{
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{
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@ -231,6 +233,9 @@ static void register_cpu_online(unsigned int cpu)
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if (cpu_has_feature(CPU_FTR_PURR))
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if (cpu_has_feature(CPU_FTR_PURR))
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sysdev_create_file(s, &attr_purr);
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sysdev_create_file(s, &attr_purr);
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if (cpu_has_feature(CPU_FTR_DSCR))
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sysdev_create_file(s, &attr_dscr);
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}
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}
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#ifdef CONFIG_HOTPLUG_CPU
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#ifdef CONFIG_HOTPLUG_CPU
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@ -272,6 +277,9 @@ static void unregister_cpu_online(unsigned int cpu)
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if (cpu_has_feature(CPU_FTR_PURR))
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if (cpu_has_feature(CPU_FTR_PURR))
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sysdev_remove_file(s, &attr_purr);
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sysdev_remove_file(s, &attr_purr);
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if (cpu_has_feature(CPU_FTR_DSCR))
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sysdev_remove_file(s, &attr_dscr);
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}
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}
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#endif /* CONFIG_HOTPLUG_CPU */
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#endif /* CONFIG_HOTPLUG_CPU */
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@ -152,6 +152,7 @@ extern void do_feature_fixups(unsigned long value, void *fixup_start,
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#define CPU_FTR_PURR LONG_ASM_CONST(0x0000400000000000)
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#define CPU_FTR_PURR LONG_ASM_CONST(0x0000400000000000)
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#define CPU_FTR_CELL_TB_BUG LONG_ASM_CONST(0x0000800000000000)
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#define CPU_FTR_CELL_TB_BUG LONG_ASM_CONST(0x0000800000000000)
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#define CPU_FTR_SPURR LONG_ASM_CONST(0x0001000000000000)
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#define CPU_FTR_SPURR LONG_ASM_CONST(0x0001000000000000)
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#define CPU_FTR_DSCR LONG_ASM_CONST(0x0002000000000000)
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#ifndef __ASSEMBLY__
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#ifndef __ASSEMBLY__
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@ -330,13 +331,14 @@ extern void do_feature_fixups(unsigned long value, void *fixup_start,
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CPU_FTR_HPTE_TABLE | CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
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CPU_FTR_HPTE_TABLE | CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
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CPU_FTR_MMCRA | CPU_FTR_SMT | \
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CPU_FTR_MMCRA | CPU_FTR_SMT | \
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CPU_FTR_COHERENT_ICACHE | CPU_FTR_LOCKLESS_TLBIE | \
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CPU_FTR_COHERENT_ICACHE | CPU_FTR_LOCKLESS_TLBIE | \
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CPU_FTR_PURR | CPU_FTR_SPURR | CPU_FTR_REAL_LE)
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CPU_FTR_PURR | CPU_FTR_SPURR | CPU_FTR_REAL_LE | \
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CPU_FTR_DSCR)
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#define CPU_FTRS_POWER6X (CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_USE_TB | \
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#define CPU_FTRS_POWER6X (CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_USE_TB | \
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CPU_FTR_HPTE_TABLE | CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
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CPU_FTR_HPTE_TABLE | CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
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CPU_FTR_MMCRA | CPU_FTR_SMT | \
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CPU_FTR_MMCRA | CPU_FTR_SMT | \
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CPU_FTR_COHERENT_ICACHE | CPU_FTR_LOCKLESS_TLBIE | \
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CPU_FTR_COHERENT_ICACHE | CPU_FTR_LOCKLESS_TLBIE | \
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CPU_FTR_PURR | CPU_FTR_CI_LARGE_PAGE | \
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CPU_FTR_PURR | CPU_FTR_CI_LARGE_PAGE | \
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CPU_FTR_SPURR | CPU_FTR_REAL_LE)
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CPU_FTR_SPURR | CPU_FTR_REAL_LE | CPU_FTR_DSCR)
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#define CPU_FTRS_CELL (CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_USE_TB | \
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#define CPU_FTRS_CELL (CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_USE_TB | \
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CPU_FTR_HPTE_TABLE | CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
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CPU_FTR_HPTE_TABLE | CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
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CPU_FTR_ALTIVEC_COMP | CPU_FTR_MMCRA | CPU_FTR_SMT | \
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CPU_FTR_ALTIVEC_COMP | CPU_FTR_MMCRA | CPU_FTR_SMT | \
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@ -143,6 +143,7 @@
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/* Special Purpose Registers (SPRNs)*/
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/* Special Purpose Registers (SPRNs)*/
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#define SPRN_CTR 0x009 /* Count Register */
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#define SPRN_CTR 0x009 /* Count Register */
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#define SPRN_DSCR 0x11
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#define SPRN_CTRLF 0x088
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#define SPRN_CTRLF 0x088
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#define SPRN_CTRLT 0x098
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#define SPRN_CTRLT 0x098
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#define CTRL_CT 0xc0000000 /* current thread */
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#define CTRL_CT 0xc0000000 /* current thread */
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