misc: tegra-profiler: send buffer fill count

Tegra Profiler misc driver: transmit the maximum buffer
occupancy to the user space.

Bug 1374266

Change-Id: Id078083a5493552c1f3bb697a1d3e4a5504e3f82
Signed-off-by: Igor Nabirushkin <inabirushkin@nvidia.com>
Reviewed-on: http://git-master/r/309633
(cherry picked from commit 757f16d5b83328d984feb3f37ebe6790fb42d15d)
Reviewed-on: http://git-master/r/325975
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Tested-by: Maxim Morin <mmorin@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>

4 files changed, 16 insertions, 3 deletions

diff --git a/drivers/misc/tegra-profiler/comm.c b/drivers/misc/tegra-profiler/comm.c
index e7a21ea10495..9273d8ad8991 100644
--- a/drivers/misc/tegra-profiler/comm.c
+++ b/drivers/misc/tegra-profiler/comm.c
@@ -46,6 +46,7 @@ static void rb_reset(struct quadd_ring_buffer *rb)
 	rb->pos_read = 0;
 	rb->pos_write = 0;
 	rb->fill_count = 0;
+	rb->max_fill_count = 0;
 }
 
 static int rb_init(struct quadd_ring_buffer *rb, size_t size)
@@ -225,6 +226,10 @@ write_sample(struct quadd_record_data *sample, void *extra_data,
 			return;
 		}
 	}
+
+	if (rb->fill_count > rb->max_fill_count)
+		rb->max_fill_count = rb->fill_count;
+
 	spin_unlock_irqrestore(&rb->lock, flags);
 }
 
@@ -541,6 +546,8 @@ device_ioctl(struct file *file,
 		spin_lock_irqsave(&rb->lock, flags);
 		state.buffer_fill_size =
 			comm_ctx.rb_size - rb_get_free_space(rb);
+		state.reserved[QUADD_MOD_STATE_IDX_RB_MAX_FILL_COUNT] =
+			rb->max_fill_count;
 		spin_unlock_irqrestore(&rb->lock, flags);
 
 		if (copy_to_user((void __user *)ioctl_param, &state,
diff --git a/drivers/misc/tegra-profiler/comm.h b/drivers/misc/tegra-profiler/comm.h
index e3c7e28719ef..f519f17b317c 100644
--- a/drivers/misc/tegra-profiler/comm.h
+++ b/drivers/misc/tegra-profiler/comm.h
@@ -32,6 +32,7 @@ struct quadd_ring_buffer {
 	size_t pos_read;
 	size_t pos_write;
 	size_t fill_count;
+	size_t max_fill_count;
 };
 
 struct quadd_parameters;
diff --git a/drivers/misc/tegra-profiler/version.h b/drivers/misc/tegra-profiler/version.h
index 8d2eec0e2c2d..2d55c518b506 100644
--- a/drivers/misc/tegra-profiler/version.h
+++ b/drivers/misc/tegra-profiler/version.h
@@ -18,7 +18,7 @@
 #ifndef __QUADD_VERSION_H
 #define __QUADD_VERSION_H
 
-#define QUADD_MODULE_VERSION		"1.31"
+#define QUADD_MODULE_VERSION		"1.32"
 #define QUADD_MODULE_BRANCH		"Dev"
 
 #endif	/* __QUADD_VERSION_H */
diff --git a/include/linux/tegra_profiler.h b/include/linux/tegra_profiler.h
index 5840ba3a8824..2efa9c185e6c 100644
--- a/include/linux/tegra_profiler.h
+++ b/include/linux/tegra_profiler.h
@@ -20,9 +20,10 @@
 #include <linux/ioctl.h>
 
 #define QUADD_SAMPLES_VERSION	16
-#define QUADD_IO_VERSION	5
+#define QUADD_IO_VERSION	6
 
-#define QUADD_IO_VERSION_DYNAMIC_RB	5
+#define QUADD_IO_VERSION_DYNAMIC_RB		5
+#define QUADD_IO_VERSION_RB_MAX_FILL_COUNT	6
 
 #define QUADD_MAX_COUNTERS	32
 #define QUADD_MAX_PROCESS	64
@@ -283,6 +284,10 @@ struct quadd_comm_cap {
 	u32 reserved[16];	/* reserved fields for future extensions */
 };
 
+enum {
+	QUADD_MOD_STATE_IDX_RB_MAX_FILL_COUNT = 0,
+};
+
 struct quadd_module_state {
 	u64 nr_all_samples;
 	u64 nr_skipped_samples;