* [robclark:drm-next 15/15] WARNING: debugfs_remove(NULL) is safe this check is probably not required
[not found] <51fe86b2.cvi+AglnfevlFCOz%fengguang.wu@intel.com>
@ 2013-08-05 2:09 ` Fengguang Wu
0 siblings, 0 replies; only message in thread
From: Fengguang Wu @ 2013-08-05 2:09 UTC (permalink / raw)
To: Rob Clark; +Cc: kbuild-all, dri-devel
Hi Rob,
FYI, there are new warnings show up in
tree: git://people.freedesktop.org/~robclark/linux drm-next
head: 72b17e21c5965bd0da5e56d96a4776e508cbd79e
commit: 72b17e21c5965bd0da5e56d96a4776e508cbd79e [15/15] WIP: drm/msm: add perf logging debugfs
scripts/checkpatch.pl 0001-WIP-drm-msm-add-perf-logging-debugfs.patch
ERROR: do not use C99 // comments
#565: drivers/gpu/drm/msm/msm_perf.c:170:
+priv->perf = perf; // XXX this isn't really good..
ERROR: do not use C99 // comments
#616: drivers/gpu/drm/msm/msm_perf.c:221:
+// priv->perf = perf;
WARNING: debugfs_remove(NULL) is safe this check is probably not required
#651: drivers/gpu/drm/msm/msm_perf.c:256:
+ if (perf->ent)
+ debugfs_remove(perf->ent);
---
0-DAY kernel build testing backend Open Source Technology Center
http://lists.01.org/mailman/listinfo/kbuild Intel Corporation
>From 72b17e21c5965bd0da5e56d96a4776e508cbd79e Mon Sep 17 00:00:00 2001
From: Rob Clark <robdclark@gmail.com>
Date: Sat, 3 Aug 2013 12:43:25 -0400
Subject: [PATCH] WIP: drm/msm: add perf logging debugfs
---
drivers/gpu/drm/msm/Makefile | 1 +
drivers/gpu/drm/msm/adreno/a3xx_gpu.c | 20 ++-
drivers/gpu/drm/msm/adreno/adreno_gpu.c | 4 +-
drivers/gpu/drm/msm/adreno/adreno_gpu.h | 2 -
drivers/gpu/drm/msm/msm_drv.c | 15 +-
drivers/gpu/drm/msm/msm_drv.h | 4 +
drivers/gpu/drm/msm/msm_gpu.c | 110 +++++++++++++
drivers/gpu/drm/msm/msm_gpu.h | 33 ++++
drivers/gpu/drm/msm/msm_perf.c | 270 +++++++++++++++++++++++++++++++
9 files changed, 448 insertions(+), 11 deletions(-)
create mode 100644 drivers/gpu/drm/msm/msm_perf.c
diff --git a/drivers/gpu/drm/msm/Makefile b/drivers/gpu/drm/msm/Makefile
index f945179..a19c731 100644
--- a/drivers/gpu/drm/msm/Makefile
+++ b/drivers/gpu/drm/msm/Makefile
@@ -23,6 +23,7 @@ msm-y := \
msm_gem.o \
msm_gem_submit.o \
msm_gpu.o \
+ msm_perf.o \
msm_rd.o \
msm_ringbuffer.o
diff --git a/drivers/gpu/drm/msm/adreno/a3xx_gpu.c b/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
index 13d61bb..2e2950f 100644
--- a/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
@@ -174,11 +174,11 @@ static int a3xx_hw_init(struct msm_gpu *gpu)
/* Turn on performance counters: */
gpu_write(gpu, REG_A3XX_RBBM_PERFCTR_CTL, 0x01);
- /* Set SP perfcounter 7 to count SP_FS_FULL_ALU_INSTRUCTIONS
- * we will use this to augment our hang detection:
- */
- gpu_write(gpu, REG_A3XX_SP_PERFCOUNTER7_SELECT,
- SP_FS_FULL_ALU_INSTRUCTIONS);
+ /* Enable the perfcntrs that we use.. */
+ for (i = 0; i < gpu->num_perfcntrs; i++) {
+ const struct msm_gpu_perfcntr *perfcntr = &gpu->perfcntrs[i];
+ gpu_write(gpu, perfcntr->select_reg, perfcntr->select_val);
+ }
gpu_write(gpu, REG_A3XX_RBBM_INT_0_MASK, A3XX_INT0_MASK);
@@ -383,6 +383,13 @@ static const struct adreno_gpu_funcs funcs = {
},
};
+static const struct msm_gpu_perfcntr perfcntrs[] = {
+ { REG_A3XX_SP_PERFCOUNTER6_SELECT, REG_A3XX_RBBM_PERFCTR_SP_6_LO,
+ SP_ALU_ACTIVE_CYCLES, "ALUACTIVE" },
+ { REG_A3XX_SP_PERFCOUNTER7_SELECT, REG_A3XX_RBBM_PERFCTR_SP_7_LO,
+ SP_FS_FULL_ALU_INSTRUCTIONS, "ALUFULL" },
+};
+
struct msm_gpu *a3xx_gpu_init(struct drm_device *dev)
{
struct a3xx_gpu *a3xx_gpu = NULL;
@@ -417,6 +424,9 @@ struct msm_gpu *a3xx_gpu_init(struct drm_device *dev)
DBG("fast_rate=%u, slow_rate=%u, bus_freq=%u",
gpu->fast_rate, gpu->slow_rate, gpu->bus_freq);
+ gpu->perfcntrs = perfcntrs;
+ gpu->num_perfcntrs = ARRAY_SIZE(perfcntrs);
+
ret = adreno_gpu_init(dev, pdev, &a3xx_gpu->base,
&funcs, config->rev);
if (ret)
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 282163e..39a65af 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -119,8 +119,6 @@ int adreno_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
struct msm_ringbuffer *ring = gpu->rb;
unsigned i, ibs = 0;
- adreno_gpu->last_fence = submit->fence;
-
for (i = 0; i < submit->nr_cmds; i++) {
switch (submit->cmd[i].type) {
case MSM_SUBMIT_CMD_IB_TARGET_BUF:
@@ -225,7 +223,7 @@ void adreno_show(struct msm_gpu *gpu, struct seq_file *m)
adreno_gpu->rev.patchid);
seq_printf(m, "fence: %d/%d\n", adreno_gpu->memptrs->fence,
- adreno_gpu->last_fence);
+ gpu->submitted_fence);
seq_printf(m, "rptr: %d\n", adreno_gpu->memptrs->rptr);
seq_printf(m, "wptr: %d\n", adreno_gpu->memptrs->wptr);
seq_printf(m, "rb wptr: %d\n", get_wptr(gpu->rb));
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
index 6b49c4f..1190a70 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
@@ -54,8 +54,6 @@ struct adreno_gpu {
uint32_t revn; /* numeric revision name */
const struct adreno_gpu_funcs *funcs;
- uint32_t last_fence;
-
/* firmware: */
const struct firmware *pm4, *pfp;
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index adcc68b..58f47a5 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -459,12 +459,25 @@ static int msm_debugfs_init(struct drm_minor *minor)
return ret;
}
- return msm_rd_debugfs_init(minor);
+ ret = msm_rd_debugfs_init(minor);
+ if (ret) {
+ dev_err(dev->dev, "could not install rd debugfs\n");
+ return ret;
+ }
+
+ ret = msm_perf_debugfs_init(minor);
+ if (ret) {
+ dev_err(dev->dev, "could not install perf debugfs\n");
+ return ret;
+ }
+
+ return 0;
}
static void msm_debugfs_cleanup(struct drm_minor *minor)
{
msm_rd_debugfs_cleanup(minor);
+ msm_perf_debugfs_cleanup(minor);
drm_debugfs_remove_files(msm_debugfs_list,
ARRAY_SIZE(msm_debugfs_list), minor);
}
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index c49a17e..545d1dc 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -44,6 +44,7 @@
struct msm_kms;
struct msm_gpu;
struct msm_rd_state;
+struct msm_perf_state;
struct msm_gem_submit;
#define NUM_DOMAINS 2 /* one for KMS, then one per gpu core (?) */
@@ -70,6 +71,7 @@ struct msm_drm_private {
wait_queue_head_t fence_event;
struct msm_rd_state *rd;
+ struct msm_perf_state *perf;
/* list of GEM objects: */
struct list_head inactive_list;
@@ -185,6 +187,8 @@ void msm_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m);
int msm_rd_debugfs_init(struct drm_minor *minor);
void msm_rd_debugfs_cleanup(struct drm_minor *minor);
void msm_rd_dump_submit(struct msm_gem_submit *submit);
+int msm_perf_debugfs_init(struct drm_minor *minor);
+void msm_perf_debugfs_cleanup(struct drm_minor *minor);
#else
static inline void msm_rd_dump_submit(struct msm_gem_submit *submit) {}
#endif
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 4775415..735d6d9 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -203,6 +203,107 @@ int msm_gpu_pm_suspend(struct msm_gpu *gpu)
}
/*
+ * Performance Counters:
+ */
+
+static bool msm_gpu_active(struct msm_gpu *gpu)
+{
+ return gpu->submitted_fence > gpu->funcs->last_fence(gpu);
+}
+
+/* called under perf_lock */
+static int update_hw_cntrs(struct msm_gpu *gpu, uint32_t ncntrs, uint32_t *cntrs)
+{
+ uint32_t current_cntrs[ARRAY_SIZE(gpu->last_cntrs)];
+ int i, n = min(ncntrs, gpu->num_perfcntrs);
+
+ /* read current values: */
+ for (i = 0; i < gpu->num_perfcntrs; i++)
+ current_cntrs[i] = gpu_read(gpu, gpu->perfcntrs[i].sample_reg);
+
+ /* update cntrs: */
+ for (i = 0; i < n; i++)
+ cntrs[i] = current_cntrs[i] - gpu->last_cntrs[i];
+
+ /* save current values: */
+ for (i = 0; i < gpu->num_perfcntrs; i++)
+ gpu->last_cntrs[i] = current_cntrs[i];
+
+ return n;
+}
+
+/* called under perf_lock */
+static void update_sw_cntrs(struct msm_gpu *gpu)
+{
+ ktime_t time;
+ uint32_t elapsed;
+ unsigned long flags;
+
+ spin_lock_irqsave(&gpu->perf_lock, flags);
+ if (!gpu->perfcntr_active)
+ goto out;
+
+ time = ktime_get();
+ elapsed = ktime_to_us(ktime_sub(time, gpu->last_sample.time));
+
+ gpu->totaltime += elapsed;
+ if (gpu->last_sample.active)
+ gpu->activetime += elapsed;
+
+ gpu->last_sample.active = msm_gpu_active(gpu);
+ gpu->last_sample.time = time;
+
+out:
+ spin_unlock_irqrestore(&gpu->perf_lock, flags);
+}
+
+void msm_gpu_perfcntr_start(struct msm_gpu *gpu)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&gpu->perf_lock, flags);
+ /* we could dynamically enable/disable perfcntr registers too.. */
+ gpu->last_sample.active = msm_gpu_active(gpu);
+ gpu->last_sample.time = ktime_get();
+ gpu->activetime = gpu->totaltime = 0;
+ gpu->perfcntr_active = true;
+ update_hw_cntrs(gpu, 0, NULL);
+ spin_unlock_irqrestore(&gpu->perf_lock, flags);
+}
+
+void msm_gpu_perfcntr_stop(struct msm_gpu *gpu)
+{
+ gpu->perfcntr_active = false;
+}
+
+/* returns -errno or # of cntrs sampled */
+int msm_gpu_perfcntr_sample(struct msm_gpu *gpu, uint32_t *activetime,
+ uint32_t *totaltime, uint32_t ncntrs, uint32_t *cntrs)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&gpu->perf_lock, flags);
+
+ if (!gpu->perfcntr_active) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ *activetime = gpu->activetime;
+ *totaltime = gpu->totaltime;
+
+ gpu->activetime = gpu->totaltime = 0;
+
+ ret = update_hw_cntrs(gpu, ncntrs, cntrs);
+
+out:
+ spin_unlock_irqrestore(&gpu->perf_lock, flags);
+
+ return ret;
+}
+
+/*
* Cmdstream submission/retirement:
*/
@@ -240,6 +341,7 @@ void msm_gpu_retire(struct msm_gpu *gpu)
{
struct msm_drm_private *priv = gpu->dev->dev_private;
queue_work(priv->wq, &gpu->retire_work);
+ update_sw_cntrs(gpu);
}
/* add bo's to gpu's ring, and kick gpu: */
@@ -256,6 +358,10 @@ int msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
msm_rd_dump_submit(submit);
+ gpu->submitted_fence = submit->fence;
+
+ update_sw_cntrs(gpu);
+
ret = gpu->funcs->submit(gpu, submit, ctx);
priv->lastctx = ctx;
@@ -304,12 +410,16 @@ int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,
struct resource *res;
int i, ret;
+ if (WARN_ON(gpu->num_perfcntrs > ARRAY_SIZE(gpu->last_cntrs)))
+ gpu->num_perfcntrs = ARRAY_SIZE(gpu->last_cntrs);
+
gpu->dev = drm;
gpu->funcs = funcs;
gpu->name = name;
INIT_LIST_HEAD(&gpu->active_list);
INIT_WORK(&gpu->retire_work, retire_worker);
+ spin_lock_init(&gpu->perf_lock);
BUG_ON(ARRAY_SIZE(clk_names) != ARRAY_SIZE(gpu->grp_clks));
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index 8d2cd6c..b537f7c 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -25,6 +25,7 @@
#include "msm_ringbuffer.h"
struct msm_gem_submit;
+struct msm_gpu_perfcntr;
/* So far, with hardware that I've seen to date, we can have:
* + zero, one, or two z180 2d cores
@@ -63,12 +64,26 @@ struct msm_gpu {
struct drm_device *dev;
const struct msm_gpu_funcs *funcs;
+ /* performance counters (hw & sw): */
+ spinlock_t perf_lock;
+ bool perfcntr_active;
+ struct {
+ bool active;
+ ktime_t time;
+ } last_sample;
+ uint32_t totaltime, activetime; /* sw counters */
+ uint32_t last_cntrs[5]; /* hw counters */
+ const struct msm_gpu_perfcntr *perfcntrs;
+ uint32_t num_perfcntrs;
+
struct msm_ringbuffer *rb;
uint32_t rb_iova;
/* list of GEM active objects: */
struct list_head active_list;
+ uint32_t submitted_fence;
+
/* worker for handling active-list retiring: */
struct work_struct retire_work;
@@ -85,6 +100,19 @@ struct msm_gpu {
uint32_t bsc;
};
+/* Perf-Counters:
+ * The select_reg and select_val are just there for the benefit of the child
+ * class that actually enables the perf counter.. but msm_gpu base class
+ * will handle sampling/displaying the counters.
+ */
+
+struct msm_gpu_perfcntr {
+ uint32_t select_reg;
+ uint32_t sample_reg;
+ uint32_t select_val;
+ const char *name;
+};
+
static inline void gpu_write(struct msm_gpu *gpu, u32 reg, u32 data)
{
msm_writel(data, gpu->mmio + (reg << 2));
@@ -98,6 +126,11 @@ static inline u32 gpu_read(struct msm_gpu *gpu, u32 reg)
int msm_gpu_pm_suspend(struct msm_gpu *gpu);
int msm_gpu_pm_resume(struct msm_gpu *gpu);
+void msm_gpu_perfcntr_start(struct msm_gpu *gpu);
+void msm_gpu_perfcntr_stop(struct msm_gpu *gpu);
+int msm_gpu_perfcntr_sample(struct msm_gpu *gpu, uint32_t *activetime,
+ uint32_t *totaltime, uint32_t ncntrs, uint32_t *cntrs);
+
void msm_gpu_retire(struct msm_gpu *gpu);
int msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
struct msm_file_private *ctx);
diff --git a/drivers/gpu/drm/msm/msm_perf.c b/drivers/gpu/drm/msm/msm_perf.c
new file mode 100644
index 0000000..1937bd2
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_perf.c
@@ -0,0 +1,270 @@
+/*
+ * Copyright (C) 2013 Red Hat
+ * Author: Rob Clark <robdclark@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* For profiling, userspace can:
+ *
+ * tail -f /sys/kernel/debug/dri/<minor>/gpu
+ *
+ * This will enable performance counters/profiling to track the busy time
+ * and any gpu specific performance counters that are supported.
+ */
+
+#ifdef CONFIG_DEBUG_FS
+
+#include <linux/debugfs.h>
+
+#include "msm_drv.h"
+#include "msm_gpu.h"
+
+struct msm_perf_state {
+ struct drm_device *dev;
+
+ bool open;
+ int cnt;
+ struct mutex read_lock;
+
+ char buf[256];
+ int buftot, bufpos;
+
+ unsigned long next_jiffies;
+
+ struct dentry *ent;
+ struct drm_info_node *node;
+};
+
+#define SAMPLE_TIME (HZ/4)
+
+/* wait for next sample time: */
+static int wait_sample(struct msm_perf_state *perf)
+{
+ unsigned long start_jiffies = jiffies;
+
+ if (time_after(perf->next_jiffies, start_jiffies)) {
+ unsigned long remaining_jiffies =
+ perf->next_jiffies - start_jiffies;
+ int ret = schedule_timeout_interruptible(remaining_jiffies);
+ if (ret > 0) {
+ /* interrupted */
+ return -ERESTARTSYS;
+ }
+ }
+ perf->next_jiffies += SAMPLE_TIME;
+ return 0;
+}
+
+static int refill_buf(struct msm_perf_state *perf)
+{
+ struct msm_drm_private *priv = perf->dev->dev_private;
+ struct msm_gpu *gpu = priv->gpu;
+ char *ptr = perf->buf;
+ int rem = sizeof(perf->buf);
+ int i, n;
+
+ if ((perf->cnt++ % 32) == 0) {
+ /* Header line: */
+ n = snprintf(ptr, rem, "%%BUSY");
+ ptr += n;
+ rem -= n;
+
+ for (i = 0; i < gpu->num_perfcntrs; i++) {
+ const struct msm_gpu_perfcntr *perfcntr = &gpu->perfcntrs[i];
+ n = snprintf(ptr, rem, "\t%s", perfcntr->name);
+ ptr += n;
+ rem -= n;
+ }
+ } else {
+ /* Sample line: */
+ uint32_t activetime = 0, totaltime = 0;
+ uint32_t cntrs[5];
+ uint32_t val;
+ int ret;
+
+ /* sleep until next sample time: */
+ ret = wait_sample(perf);
+ if (ret)
+ return ret;
+
+ ret = msm_gpu_perfcntr_sample(gpu, &activetime, &totaltime,
+ ARRAY_SIZE(cntrs), cntrs);
+ if (ret < 0)
+ return ret;
+
+ val = totaltime ? 1000 * activetime / totaltime : 0;
+ n = snprintf(ptr, rem, "%3d.%d%%", val / 10, val % 10);
+ ptr += n;
+ rem -= n;
+
+ for (i = 0; i < ret; i++) {
+ /* cycle counters (I think).. convert to MHz.. */
+ val = cntrs[i] / 10000;
+ n = snprintf(ptr, rem, "\t%5d.%02d",
+ val / 100, val % 100);
+ ptr += n;
+ rem -= n;
+ }
+ }
+
+ n = snprintf(ptr, rem, "\n");
+ ptr += n;
+ rem -= n;
+
+ perf->bufpos = 0;
+ perf->buftot = ptr - perf->buf;
+
+ return 0;
+}
+
+static ssize_t perf_read(struct file *file, char __user *buf,
+ size_t sz, loff_t *ppos)
+{
+ struct msm_perf_state *perf = file->private_data;
+ int n = 0, ret;
+
+ mutex_lock(&perf->read_lock);
+
+ if (perf->bufpos >= perf->buftot) {
+ ret = refill_buf(perf);
+ if (ret)
+ goto out;
+ }
+
+ n = min((int)sz, perf->buftot - perf->bufpos);
+ ret = copy_to_user(buf, &perf->buf[perf->bufpos], n);
+ if (ret)
+ goto out;
+
+ perf->bufpos += n;
+ *ppos += n;
+
+out:
+ mutex_unlock(&perf->read_lock);
+ if (ret)
+ return ret;
+ return n;
+}
+
+static int perf_open(struct inode *inode, struct file *file)
+{
+ struct msm_perf_state *perf = inode->i_private;
+ struct drm_device *dev = perf->dev;
+ struct msm_drm_private *priv = dev->dev_private;
+ struct msm_gpu *gpu = priv->gpu;
+ int ret = 0;
+
+ mutex_lock(&dev->struct_mutex);
+
+priv->perf = perf; // XXX this isn't really good..
+
+ if (perf->open || !gpu) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ file->private_data = perf;
+ perf->open = true;
+ perf->cnt = 0;
+ perf->buftot = 0;
+ perf->bufpos = 0;
+ msm_gpu_perfcntr_start(gpu);
+ perf->next_jiffies = jiffies + SAMPLE_TIME;
+
+out:
+ mutex_unlock(&dev->struct_mutex);
+ return ret;
+}
+
+static int perf_release(struct inode *inode, struct file *file)
+{
+ struct msm_perf_state *perf = inode->i_private;
+ struct msm_drm_private *priv = perf->dev->dev_private;
+ msm_gpu_perfcntr_stop(priv->gpu);
+ perf->open = false;
+ return 0;
+}
+
+
+static const struct file_operations perf_debugfs_fops = {
+ .owner = THIS_MODULE,
+ .open = perf_open,
+ .read = perf_read,
+ .llseek = no_llseek,
+ .release = perf_release,
+};
+
+int msm_perf_debugfs_init(struct drm_minor *minor)
+{
+ struct msm_drm_private *priv = minor->dev->dev_private;
+ struct msm_perf_state *perf;
+
+ perf = kzalloc(sizeof(*perf), GFP_KERNEL);
+ if (!perf)
+ return -ENOMEM;
+
+ perf->dev = minor->dev;
+
+ mutex_init(&perf->read_lock);
+DBG("********** perf->dev=%p, priv=%p", perf->dev, priv);
+// priv->perf = perf;
+
+ perf->node = kzalloc(sizeof(*perf->node), GFP_KERNEL);
+ if (!perf->node)
+ goto fail;
+
+ perf->ent = debugfs_create_file("perf", S_IFREG | S_IRUGO,
+ minor->debugfs_root, perf, &perf_debugfs_fops);
+ if (!perf->ent) {
+ DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s/perf\n",
+ minor->debugfs_root->d_name.name);
+ goto fail;
+ }
+
+ perf->node->minor = minor;
+ perf->node->dent = perf->ent;
+ perf->node->info_ent = NULL;
+
+ mutex_lock(&minor->debugfs_lock);
+ list_add(&perf->node->list, &minor->debugfs_list);
+ mutex_unlock(&minor->debugfs_lock);
+
+ return 0;
+
+fail:
+ msm_perf_debugfs_cleanup(minor);
+ return -1;
+}
+
+void msm_perf_debugfs_cleanup(struct drm_minor *minor)
+{
+ struct msm_drm_private *priv = minor->dev->dev_private;
+ struct msm_perf_state *perf = priv->perf;
+
+ if (perf->ent)
+ debugfs_remove(perf->ent);
+
+ if (perf->node) {
+ mutex_lock(&minor->debugfs_lock);
+ list_del(&perf->node->list);
+ mutex_unlock(&minor->debugfs_lock);
+ kfree(perf->node);
+ }
+
+ mutex_destroy(&perf->read_lock);
+
+ kfree(perf);
+}
+
+#endif
--
1.7.10.4
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