arch/sh/kernel/cpu/sh4a/perf_event.c

   1 /*
   2  * Performance events support for SH-4A performance counters
   3  *
   4  *  Copyright (C) 2009, 2010  Paul Mundt
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  */
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/io.h>
  13 #include <linux/irq.h>
  14 #include <linux/perf_event.h>
  15 #include <asm/processor.h>
  16
  17 #define PPC_CCBR(idx)   (0xff200800 + (sizeof(u32) * idx))
  18 #define PPC_PMCTR(idx)  (0xfc100000 + (sizeof(u32) * idx))
  19
  20 #define CCBR_CIT_MASK   (0x7ff << 6)
  21 #define CCBR_DUC        (1 << 3)
  22 #define CCBR_CMDS       (1 << 1)
  23 #define CCBR_PPCE       (1 << 0)
  24
  25 #ifdef CONFIG_CPU_SHX3
  26 /*
  27  * The PMCAT location for SH-X3 CPUs was quietly moved, while the CCBR
  28  * and PMCTR locations remains tentatively constant. This change remains
  29  * wholly undocumented, and was simply found through trial and error.
  30  *
  31  * Early cuts of SH-X3 still appear to use the SH-X/SH-X2 locations, and
  32  * it's unclear when this ceased to be the case. For now we always use
  33  * the new location (if future parts keep up with this trend then
  34  * scanning for them at runtime also remains a viable option.)
  35  *
  36  * The gap in the register space also suggests that there are other
  37  * undocumented counters, so this will need to be revisited at a later
  38  * point in time.
  39  */
  40 #define PPC_PMCAT       0xfc100240
  41 #else
  42 #define PPC_PMCAT       0xfc100080
  43 #endif
  44
  45 #define PMCAT_OVF3      (1 << 27)
  46 #define PMCAT_CNN3      (1 << 26)
  47 #define PMCAT_CLR3      (1 << 25)
  48 #define PMCAT_OVF2      (1 << 19)
  49 #define PMCAT_CLR2      (1 << 17)
  50 #define PMCAT_OVF1      (1 << 11)
  51 #define PMCAT_CNN1      (1 << 10)
  52 #define PMCAT_CLR1      (1 << 9)
  53 #define PMCAT_OVF0      (1 << 3)
  54 #define PMCAT_CLR0      (1 << 1)
  55
  56 static struct sh_pmu sh4a_pmu;
  57
  58 /*
  59  * Supported raw event codes:
  60  *
  61  *      Event Code      Description
  62  *      ----------      -----------
  63  *
  64  *      0x0000          number of elapsed cycles
  65  *      0x0200          number of elapsed cycles in privileged mode
  66  *      0x0280          number of elapsed cycles while SR.BL is asserted
  67  *      0x0202          instruction execution
  68  *      0x0203          instruction execution in parallel
  69  *      0x0204          number of unconditional branches
  70  *      0x0208          number of exceptions
  71  *      0x0209          number of interrupts
  72  *      0x0220          UTLB miss caused by instruction fetch
  73  *      0x0222          UTLB miss caused by operand access
  74  *      0x02a0          number of ITLB misses
  75  *      0x0028          number of accesses to instruction memories
  76  *      0x0029          number of accesses to instruction cache
  77  *      0x002a          instruction cache miss
  78  *      0x022e          number of access to instruction X/Y memory
  79  *      0x0030          number of reads to operand memories
  80  *      0x0038          number of writes to operand memories
  81  *      0x0031          number of operand cache read accesses
  82  *      0x0039          number of operand cache write accesses
  83  *      0x0032          operand cache read miss
  84  *      0x003a          operand cache write miss
  85  *      0x0236          number of reads to operand X/Y memory
  86  *      0x023e          number of writes to operand X/Y memory
  87  *      0x0237          number of reads to operand U memory
  88  *      0x023f          number of writes to operand U memory
  89  *      0x0337          number of U memory read buffer misses
  90  *      0x02b4          number of wait cycles due to operand read access
  91  *      0x02bc          number of wait cycles due to operand write access
  92  *      0x0033          number of wait cycles due to operand cache read miss
  93  *      0x003b          number of wait cycles due to operand cache write miss
  94  */
  95
  96 /*
  97  * Special reserved bits used by hardware emulators, read values will
  98  * vary, but writes must always be 0.
  99  */
 100 #define PMCAT_EMU_CLR_MASK      ((1 << 24) | (1 << 16) | (1 << 8) | (1 << 0))
 101
 102 static const int sh4a_general_events[] = {
 103         [PERF_COUNT_HW_CPU_CYCLES]              = 0x0000,
 104         [PERF_COUNT_HW_INSTRUCTIONS]            = 0x0202,
 105         [PERF_COUNT_HW_CACHE_REFERENCES]        = 0x0029,       /* I-cache */
 106         [PERF_COUNT_HW_CACHE_MISSES]            = 0x002a,       /* I-cache */
 107         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]     = 0x0204,
 108         [PERF_COUNT_HW_BRANCH_MISSES]           = -1,
 109         [PERF_COUNT_HW_BUS_CYCLES]              = -1,
 110 };
 111
 112 #define C(x)    PERF_COUNT_HW_CACHE_##x
 113
 114 static const int sh4a_cache_events
 115                         [PERF_COUNT_HW_CACHE_MAX]
 116                         [PERF_COUNT_HW_CACHE_OP_MAX]
 117                         [PERF_COUNT_HW_CACHE_RESULT_MAX] =
 118 {
 119         [ C(L1D) ] = {
 120                 [ C(OP_READ) ] = {
 121                         [ C(RESULT_ACCESS) ] = 0x0031,
 122                         [ C(RESULT_MISS)   ] = 0x0032,
 123                 },
 124                 [ C(OP_WRITE) ] = {
 125                         [ C(RESULT_ACCESS) ] = 0x0039,
 126                         [ C(RESULT_MISS)   ] = 0x003a,
 127                 },
 128                 [ C(OP_PREFETCH) ] = {
 129                         [ C(RESULT_ACCESS) ] = 0,
 130                         [ C(RESULT_MISS)   ] = 0,
 131                 },
 132         },
 133
 134         [ C(L1I) ] = {
 135                 [ C(OP_READ) ] = {
 136                         [ C(RESULT_ACCESS) ] = 0x0029,
 137                         [ C(RESULT_MISS)   ] = 0x002a,
 138                 },
 139                 [ C(OP_WRITE) ] = {
 140                         [ C(RESULT_ACCESS) ] = -1,
 141                         [ C(RESULT_MISS)   ] = -1,
 142                 },
 143                 [ C(OP_PREFETCH) ] = {
 144                         [ C(RESULT_ACCESS) ] = 0,
 145                         [ C(RESULT_MISS)   ] = 0,
 146                 },
 147         },
 148
 149         [ C(LL) ] = {
 150                 [ C(OP_READ) ] = {
 151                         [ C(RESULT_ACCESS) ] = 0x0030,
 152                         [ C(RESULT_MISS)   ] = 0,
 153                 },
 154                 [ C(OP_WRITE) ] = {
 155                         [ C(RESULT_ACCESS) ] = 0x0038,
 156                         [ C(RESULT_MISS)   ] = 0,
 157                 },
 158                 [ C(OP_PREFETCH) ] = {
 159                         [ C(RESULT_ACCESS) ] = 0,
 160                         [ C(RESULT_MISS)   ] = 0,
 161                 },
 162         },
 163
 164         [ C(DTLB) ] = {
 165                 [ C(OP_READ) ] = {
 166                         [ C(RESULT_ACCESS) ] = 0x0222,
 167                         [ C(RESULT_MISS)   ] = 0x0220,
 168                 },
 169                 [ C(OP_WRITE) ] = {
 170                         [ C(RESULT_ACCESS) ] = 0,
 171                         [ C(RESULT_MISS)   ] = 0,
 172                 },
 173                 [ C(OP_PREFETCH) ] = {
 174                         [ C(RESULT_ACCESS) ] = 0,
 175                         [ C(RESULT_MISS)   ] = 0,
 176                 },
 177         },
 178
 179         [ C(ITLB) ] = {
 180                 [ C(OP_READ) ] = {
 181                         [ C(RESULT_ACCESS) ] = 0,
 182                         [ C(RESULT_MISS)   ] = 0x02a0,
 183                 },
 184                 [ C(OP_WRITE) ] = {
 185                         [ C(RESULT_ACCESS) ] = -1,
 186                         [ C(RESULT_MISS)   ] = -1,
 187                 },
 188                 [ C(OP_PREFETCH) ] = {
 189                         [ C(RESULT_ACCESS) ] = -1,
 190                         [ C(RESULT_MISS)   ] = -1,
 191                 },
 192         },
 193
 194         [ C(BPU) ] = {
 195                 [ C(OP_READ) ] = {
 196                         [ C(RESULT_ACCESS) ] = -1,
 197                         [ C(RESULT_MISS)   ] = -1,
 198                 },
 199                 [ C(OP_WRITE) ] = {
 200                         [ C(RESULT_ACCESS) ] = -1,
 201                         [ C(RESULT_MISS)   ] = -1,
 202                 },
 203                 [ C(OP_PREFETCH) ] = {
 204                         [ C(RESULT_ACCESS) ] = -1,
 205                         [ C(RESULT_MISS)   ] = -1,
 206                 },
 207         },
 208 };
 209
 210 static int sh4a_event_map(int event)
 211 {
 212         return sh4a_general_events[event];
 213 }
 214
 215 static u64 sh4a_pmu_read(int idx)
 216 {
 217         return __raw_readl(PPC_PMCTR(idx));
 218 }
 219
 220 static void sh4a_pmu_disable(struct hw_perf_event *hwc, int idx)
 221 {
 222         unsigned int tmp;
 223
 224         tmp = __raw_readl(PPC_CCBR(idx));
 225         tmp &= ~(CCBR_CIT_MASK | CCBR_DUC);
 226         __raw_writel(tmp, PPC_CCBR(idx));
 227 }
 228
 229 static void sh4a_pmu_enable(struct hw_perf_event *hwc, int idx)
 230 {
 231         unsigned int tmp;
 232
 233         tmp = __raw_readl(PPC_PMCAT);
 234         tmp &= ~PMCAT_EMU_CLR_MASK;
 235         tmp |= idx ? PMCAT_CLR1 : PMCAT_CLR0;
 236         __raw_writel(tmp, PPC_PMCAT);
 237
 238         tmp = __raw_readl(PPC_CCBR(idx));
 239         tmp |= (hwc->config << 6) | CCBR_CMDS | CCBR_PPCE;
 240         __raw_writel(tmp, PPC_CCBR(idx));
 241
 242         __raw_writel(__raw_readl(PPC_CCBR(idx)) | CCBR_DUC, PPC_CCBR(idx));
 243 }
 244
 245 static void sh4a_pmu_disable_all(void)
 246 {
 247         int i;
 248
 249         for (i = 0; i < sh4a_pmu.num_events; i++)
 250                 __raw_writel(__raw_readl(PPC_CCBR(i)) & ~CCBR_DUC, PPC_CCBR(i));
 251 }
 252
 253 static void sh4a_pmu_enable_all(void)
 254 {
 255         int i;
 256
 257         for (i = 0; i < sh4a_pmu.num_events; i++)
 258                 __raw_writel(__raw_readl(PPC_CCBR(i)) | CCBR_DUC, PPC_CCBR(i));
 259 }
 260
 261 static struct sh_pmu sh4a_pmu = {
 262         .name           = "sh4a",
 263         .num_events     = 2,
 264         .event_map      = sh4a_event_map,
 265         .max_events     = ARRAY_SIZE(sh4a_general_events),
 266         .raw_event_mask = 0x3ff,
 267         .cache_events   = &sh4a_cache_events,
 268         .read           = sh4a_pmu_read,
 269         .disable        = sh4a_pmu_disable,
 270         .enable         = sh4a_pmu_enable,
 271         .disable_all    = sh4a_pmu_disable_all,
 272         .enable_all     = sh4a_pmu_enable_all,
 273 };
 274
 275 static int __init sh4a_pmu_init(void)
 276 {
 277         /*
 278          * Make sure this CPU actually has perf counters.
 279          */
 280         if (!(boot_cpu_data.flags & CPU_HAS_PERF_COUNTER)) {
 281                 pr_notice("HW perf events unsupported, software events only.\n");
 282                 return -ENODEV;
 283         }
 284
 285         return register_sh_pmu(&sh4a_pmu);
 286 }
 287 arch_initcall(sh4a_pmu_init);