From bffd4927ba4377aa38be5450e20e0fecd2523fe3 Mon Sep 17 00:00:00 2001 From: Kevin Corry Date: Tue, 24 Oct 2006 18:31:21 +0200 Subject: [PATCH] [POWERPC] cell: add shadow registers for pmd_reg Many of the registers in the performance monitoring unit are write-only. We need to save a "shadow" copy when we write to those registers so we can retrieve the values if we need them later. The new cbe_pmd_shadow_regs structure is added to the cbe_regs_map structure so we have the appropriate per-node copies of these shadow values. Signed-off-by: Kevin Corry Signed-off-by: Arnd Bergmann Signed-off-by: Paul Mackerras --- arch/powerpc/platforms/cell/cbe_regs.c | 17 +++++++++++++ arch/powerpc/platforms/cell/cbe_regs.h | 35 ++++++++++++++++++++++++++ 2 files changed, 52 insertions(+) diff --git a/arch/powerpc/platforms/cell/cbe_regs.c b/arch/powerpc/platforms/cell/cbe_regs.c index 5e3e0e925e4e..5a91b75c2f01 100644 --- a/arch/powerpc/platforms/cell/cbe_regs.c +++ b/arch/powerpc/platforms/cell/cbe_regs.c @@ -30,6 +30,7 @@ static struct cbe_regs_map struct cbe_pmd_regs __iomem *pmd_regs; struct cbe_iic_regs __iomem *iic_regs; struct cbe_mic_tm_regs __iomem *mic_tm_regs; + struct cbe_pmd_shadow_regs pmd_shadow_regs; } cbe_regs_maps[MAX_CBE]; static int cbe_regs_map_count; @@ -80,6 +81,22 @@ struct cbe_pmd_regs __iomem *cbe_get_cpu_pmd_regs(int cpu) } EXPORT_SYMBOL_GPL(cbe_get_cpu_pmd_regs); +struct cbe_pmd_shadow_regs *cbe_get_pmd_shadow_regs(struct device_node *np) +{ + struct cbe_regs_map *map = cbe_find_map(np); + if (map == NULL) + return NULL; + return &map->pmd_shadow_regs; +} + +struct cbe_pmd_shadow_regs *cbe_get_cpu_pmd_shadow_regs(int cpu) +{ + struct cbe_regs_map *map = cbe_thread_map[cpu].regs; + if (map == NULL) + return NULL; + return &map->pmd_shadow_regs; +} + struct cbe_iic_regs __iomem *cbe_get_iic_regs(struct device_node *np) { struct cbe_regs_map *map = cbe_find_map(np); diff --git a/arch/powerpc/platforms/cell/cbe_regs.h b/arch/powerpc/platforms/cell/cbe_regs.h index 02bdbc1cd6e7..d352f110ef9c 100644 --- a/arch/powerpc/platforms/cell/cbe_regs.h +++ b/arch/powerpc/platforms/cell/cbe_regs.h @@ -120,6 +120,41 @@ struct cbe_pmd_regs { extern struct cbe_pmd_regs __iomem *cbe_get_pmd_regs(struct device_node *np); extern struct cbe_pmd_regs __iomem *cbe_get_cpu_pmd_regs(int cpu); +/* + * PMU shadow registers + * + * Many of the registers in the performance monitoring unit are write-only, + * so we need to save a copy of what we write to those registers. + * + * The actual data counters are read/write. However, writing to the counters + * only takes effect if the PMU is enabled. Otherwise the value is stored in + * a hardware latch until the next time the PMU is enabled. So we save a copy + * of the counter values if we need to read them back while the PMU is + * disabled. The counter_value_in_latch field is a bitmap indicating which + * counters currently have a value waiting to be written. + */ + +#define NR_PHYS_CTRS 4 +#define NR_CTRS (NR_PHYS_CTRS * 2) + +struct cbe_pmd_shadow_regs { + u32 group_control; + u32 debug_bus_control; + u32 trace_address; + u32 ext_tr_timer; + u32 pm_status; + u32 pm_control; + u32 pm_interval; + u32 pm_start_stop; + u32 pm07_control[NR_CTRS]; + + u32 pm_ctr[NR_PHYS_CTRS]; + u32 counter_value_in_latch; +}; + +extern struct cbe_pmd_shadow_regs *cbe_get_pmd_shadow_regs(struct device_node *np); +extern struct cbe_pmd_shadow_regs *cbe_get_cpu_pmd_shadow_regs(int cpu); + /* * * IIC unit register definitions -- 2.20.1