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gpu: nvgpu: Provide cpu gpu time correlation via ioctl

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bug 1648908

Provides pairs of CPU and GPU timestamps that
can be used for correlatiing the two timebases

- IOCTL made available /dev/nvhost-ctrl-gpu

Change-Id: I1458b9d33d794b1b02ec9fd29ed9426756b94bcd
Signed-off-by: Arul Sekar <aruls@nvidia.com>
Reviewed-on: http://git-master/r/1029732
Reviewed-by: Arun Gona <agona@nvidia.com>
Tested-by: Arun Gona <agona@nvidia.com>
Reviewed-on: http://git-master/r/1111715
GVS: Gerrit_Virtual_Submit
Reviewed-by: Thomas Fleury <tfleury@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
This commit is contained in:
Arul Sekar
2016-03-11 11:24:20 -08:00
committed by Terje Bergstrom
parent 97108797a2
commit 032efd066e
4 changed files with 139 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

94
drivers/gpu/nvgpu/gk20a/ctrl_gk20a.c
View File

@@ -29,6 +29,7 @@
#include "hw_gr_gk20a.h"
#include "hw_fb_gk20a.h"
#include "hw_proj_gk20a.h"
#include "hw_timer_gk20a.h"
int gk20a_ctrl_dev_open(struct inode *inode, struct file *filp)
{
@@ -530,6 +531,94 @@ static int gk20a_ctrl_get_buffer_info(
&args->out.id, &args->out.length);
}
static inline u64 get_cpu_timestamp_tsc(void)
{
return ((u64) get_cycles());
}
static inline u64 get_cpu_timestamp_jiffies(void)
{
return (get_jiffies_64() - INITIAL_JIFFIES);
}
static inline u64 get_cpu_timestamp_timeofday(void)
{
struct timeval tv;
do_gettimeofday(&tv);
return timeval_to_jiffies(&tv);
}
static inline int get_timestamps_zipper(struct gk20a *g,
u64 (*get_cpu_timestamp)(void),
struct nvgpu_gpu_get_cpu_time_correlation_info_args *args)
{
int err = 0;
int i = 0;
u32 gpu_timestamp_hi_new = 0;
u32 gpu_timestamp_hi_old = 0;
if (gk20a_busy(g->dev)) {
gk20a_err(dev_from_gk20a(g), "GPU not powered on\n");
err = -EINVAL;
goto end;
}
/* get zipper reads of gpu and cpu counter values */
gpu_timestamp_hi_old = gk20a_readl(g, timer_time_1_r());
for (i = 0; i < args->count; i++) {
u32 gpu_timestamp_lo = 0;
u32 gpu_timestamp_hi = 0;
gpu_timestamp_lo = gk20a_readl(g, timer_time_0_r());
args->samples[i].cpu_timestamp = get_cpu_timestamp();
rmb(); /* maintain zipper read order */
gpu_timestamp_hi_new = gk20a_readl(g, timer_time_1_r());
/* pick the appropriate gpu counter hi bits */
gpu_timestamp_hi = (gpu_timestamp_lo & (1L << 31)) ?
gpu_timestamp_hi_old : gpu_timestamp_hi_new;
args->samples[i].gpu_timestamp =
((u64)gpu_timestamp_hi << 32) | (u64)gpu_timestamp_lo;
gpu_timestamp_hi_old = gpu_timestamp_hi_new;
}
end:
gk20a_idle(g->dev);
return err;
}
static int nvgpu_gpu_get_cpu_time_correlation_info(
struct gk20a *g,
struct nvgpu_gpu_get_cpu_time_correlation_info_args *args)
{
int err = 0;
u64 (*get_cpu_timestamp)(void) = NULL;
if (args->count > NVGPU_GPU_GET_CPU_TIME_CORRELATION_INFO_MAX_COUNT)
return -EINVAL;
switch (args->source_id) {
case NVGPU_GPU_GET_CPU_TIME_CORRELATION_INFO_SRC_ID_TSC:
get_cpu_timestamp = get_cpu_timestamp_tsc;
break;
case NVGPU_GPU_GET_CPU_TIME_CORRELATION_INFO_SRC_ID_JIFFIES:
get_cpu_timestamp = get_cpu_timestamp_jiffies;
break;
case NVGPU_GPU_GET_CPU_TIME_CORRELATION_INFO_SRC_ID_TIMEOFDAY:
get_cpu_timestamp = get_cpu_timestamp_timeofday;
break;
default:
gk20a_err(dev_from_gk20a(g), "invalid cpu clock source id\n");
return -EINVAL;
}
err = get_timestamps_zipper(g, get_cpu_timestamp, args);
return err;
}
long gk20a_ctrl_dev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct platform_device *dev = filp->private_data;
@@ -762,6 +851,11 @@ long gk20a_ctrl_dev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg
(struct nvgpu_gpu_get_buffer_info_args *)buf);
break;
case NVGPU_GPU_IOCTL_GET_CPU_TIME_CORRELATION_INFO:
err = nvgpu_gpu_get_cpu_time_correlation_info(g,
(struct nvgpu_gpu_get_cpu_time_correlation_info_args *)buf);
break;
default:
dev_dbg(dev_from_gk20a(g), "unrecognized gpu ioctl cmd: 0x%x", cmd);
err = -ENOTTY;