[POWERPC] spufs: Add stat file to spufs

Export per-context statistics in spufs.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 79 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/file.c b/arch/powerpc/platforms/cell/spufs/file.c
index 2bb51ca51a6c..30f7b077f347 100644
--- a/arch/powerpc/platforms/cell/spufs/file.c
+++ b/arch/powerpc/platforms/cell/spufs/file.c
@@ -2059,6 +2059,83 @@ static const struct file_operations spufs_tid_fops = {
         .release        = single_release,
 };
 
+static const char *ctx_state_names[] = {
+        "user", "system", "iowait", "loaded"
+};
+
+static unsigned long long spufs_acct_time(struct spu_context *ctx,
+                enum spuctx_execution_state state)
+{
+        unsigned long time = ctx->stats.times[state];
+
+        if (ctx->stats.execution_state == state)
+                time += jiffies - ctx->stats.tstamp;
+
+        return jiffies_to_msecs(time);
+}
+
+static unsigned long long spufs_slb_flts(struct spu_context *ctx)
+{
+        unsigned long long slb_flts = ctx->stats.slb_flt;
+
+        if (ctx->state == SPU_STATE_RUNNABLE) {
+                slb_flts += (ctx->spu->stats.slb_flt -
+                             ctx->stats.slb_flt_base);
+        }
+
+        return slb_flts;
+}
+
+static unsigned long long spufs_class2_intrs(struct spu_context *ctx)
+{
+        unsigned long long class2_intrs = ctx->stats.class2_intr;
+
+        if (ctx->state == SPU_STATE_RUNNABLE) {
+                class2_intrs += (ctx->spu->stats.class2_intr -
+                                 ctx->stats.class2_intr_base);
+        }
+
+        return class2_intrs;
+}
+
+
+static int spufs_show_stat(struct seq_file *s, void *private)
+{
+        struct spu_context *ctx = s->private;
+
+        spu_acquire(ctx);
+        seq_printf(s, "%s %llu %llu %llu %llu "
+                      "%llu %llu %llu %llu %llu %llu %llu %llu\n",
+                ctx_state_names[ctx->stats.execution_state],
+                spufs_acct_time(ctx, SPUCTX_UTIL_USER),
+                spufs_acct_time(ctx, SPUCTX_UTIL_SYSTEM),
+                spufs_acct_time(ctx, SPUCTX_UTIL_IOWAIT),
+                spufs_acct_time(ctx, SPUCTX_UTIL_LOADED),
+                ctx->stats.vol_ctx_switch,
+                ctx->stats.invol_ctx_switch,
+                spufs_slb_flts(ctx),
+                ctx->stats.hash_flt,
+                ctx->stats.min_flt,
+                ctx->stats.maj_flt,
+                spufs_class2_intrs(ctx),
+                ctx->stats.libassist);
+        spu_release(ctx);
+        return 0;
+}
+
+static int spufs_stat_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, spufs_show_stat, SPUFS_I(inode)->i_ctx);
+}
+
+static const struct file_operations spufs_stat_fops = {
+        .open           = spufs_stat_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+
 struct tree_descr spufs_dir_contents[] = {
         { "capabilities", &spufs_caps_fops, 0444, },
         { "mem",  &spufs_mem_fops,  0666, },
@@ -2093,6 +2170,7 @@ struct tree_descr spufs_dir_contents[] = {
         { "dma_info", &spufs_dma_info_fops, 0444, },
         { "proxydma_info", &spufs_proxydma_info_fops, 0444, },
         { "tid", &spufs_tid_fops, 0444, },
+        { "stat", &spufs_stat_fops, 0444, },
         {},
 };
 
@@ -2117,6 +2195,7 @@ struct tree_descr spufs_dir_nosched_contents[] = {
         { "phys-id", &spufs_id_ops, 0666, },
         { "object-id", &spufs_object_id_ops, 0666, },
         { "tid", &spufs_tid_fops, 0444, },
+        { "stat", &spufs_stat_fops, 0444, },
         {},
 };