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drm/panfrost: Add cycle counter job requirement

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Extend the uAPI with a new job requirement flag for cycle
counters. This requirement is used by userland to indicate that a job
requires cycle counters or system timestamp to be propagated. (for use
with write value timestamp jobs)

We cannot enable cycle counters unconditionally as this would result in
an increase of GPU power consumption. As a result, they should be left
off unless required by the application.

If a job requires cycle counters or system timestamps propagation, we
must enable cycle counting before issuing a job and disable it right
after the job completes.

Since this extends the uAPI and because userland needs a way to advertise
features like VK_KHR_shader_clock conditionally, we bumps the driver
minor version.

v2:
- Rework commit message
- Squash uAPI changes and implementation in this commit
- Simplify changes based on Steven Price comments

v3:
- Add Steven Price r-b
- Fix a codestyle issue

Signed-off-by: Mary Guillemard <mary.guillemard@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240819080224.24914-3-mary.guillemard@collabora.com
This commit is contained in:
Mary Guillemard 2024-08-19 10:02:23 +02:00 committed by Steven Price
parent 9c75b16cab
commit 3a8d97611b
3 changed files with 24 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/gpu/drm/panfrost/panfrost_drv.c
View File

@ -25,6 +25,8 @@
#include "panfrost_gpu.h"
#include "panfrost_perfcnt.h"
#define JOB_REQUIREMENTS (PANFROST_JD_REQ_FS | PANFROST_JD_REQ_CYCLE_COUNT)
static bool unstable_ioctls;
module_param_unsafe(unstable_ioctls, bool, 0600);
@ -282,7 +284,7 @@ static int panfrost_ioctl_submit(struct drm_device *dev, void *data,
if (!args->jc)
return -EINVAL;
if (args->requirements && args->requirements != PANFROST_JD_REQ_FS)
if (args->requirements & ~JOB_REQUIREMENTS)
return -EINVAL;
if (args->out_sync > 0) {
@ -621,6 +623,8 @@ static const struct file_operations panfrost_drm_driver_fops = {
* - 1.0 - initial interface
* - 1.1 - adds HEAP and NOEXEC flags for CREATE_BO
* - 1.2 - adds AFBC_FEATURES query
* - 1.3 - adds JD_REQ_CYCLE_COUNT job requirement for SUBMIT
* - adds SYSTEM_TIMESTAMP and SYSTEM_TIMESTAMP_FREQUENCY queries
*/
static const struct drm_driver panfrost_drm_driver = {
.driver_features = DRIVER_RENDER | DRIVER_GEM | DRIVER_SYNCOBJ,
@ -634,7 +638,7 @@ static const struct drm_driver panfrost_drm_driver = {
.desc = "panfrost DRM",
.date = "20180908",
.major = 1,
.minor = 2,
.minor = 3,
.gem_create_object = panfrost_gem_create_object,
.gem_prime_import_sg_table = panfrost_gem_prime_import_sg_table,

28
drivers/gpu/drm/panfrost/panfrost_job.c
View File

@ -159,16 +159,17 @@ panfrost_dequeue_job(struct panfrost_device *pfdev, int slot)
struct panfrost_job *job = pfdev->jobs[slot][0];
WARN_ON(!job);
if (job->is_profiled) {
if (job->engine_usage) {
job->engine_usage->elapsed_ns[slot] +=
ktime_to_ns(ktime_sub(ktime_get(), job->start_time));
job->engine_usage->cycles[slot] +=
panfrost_cycle_counter_read(pfdev) - job->start_cycles;
}
panfrost_cycle_counter_put(job->pfdev);
if (job->is_profiled && job->engine_usage) {
job->engine_usage->elapsed_ns[slot] +=
ktime_to_ns(ktime_sub(ktime_get(), job->start_time));
job->engine_usage->cycles[slot] +=
panfrost_cycle_counter_read(pfdev) - job->start_cycles;
}
if (job->requirements & PANFROST_JD_REQ_CYCLE_COUNT || job->is_profiled)
panfrost_cycle_counter_put(pfdev);
pfdev->jobs[slot][0] = pfdev->jobs[slot][1];
pfdev->jobs[slot][1] = NULL;
@ -243,9 +244,13 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
subslot = panfrost_enqueue_job(pfdev, js, job);
/* Don't queue the job if a reset is in progress */
if (!atomic_read(&pfdev->reset.pending)) {
if (pfdev->profile_mode) {
job->is_profiled = pfdev->profile_mode;
if (job->requirements & PANFROST_JD_REQ_CYCLE_COUNT ||
job->is_profiled)
panfrost_cycle_counter_get(pfdev);
job->is_profiled = true;
if (job->is_profiled) {
job->start_time = ktime_get();
job->start_cycles = panfrost_cycle_counter_read(pfdev);
}
@ -693,7 +698,8 @@ panfrost_reset(struct panfrost_device *pfdev,
spin_lock(&pfdev->js->job_lock);
for (i = 0; i < NUM_JOB_SLOTS; i++) {
for (j = 0; j < ARRAY_SIZE(pfdev->jobs[0]) && pfdev->jobs[i][j]; j++) {
if (pfdev->jobs[i][j]->is_profiled)
if (pfdev->jobs[i][j]->requirements & PANFROST_JD_REQ_CYCLE_COUNT ||
pfdev->jobs[i][j]->is_profiled)
panfrost_cycle_counter_put(pfdev->jobs[i][j]->pfdev);
pm_runtime_put_noidle(pfdev->dev);
panfrost_devfreq_record_idle(&pfdev->pfdevfreq);

1
include/uapi/drm/panfrost_drm.h
View File

@ -40,6 +40,7 @@ extern "C" {
#define DRM_IOCTL_PANFROST_PERFCNT_DUMP DRM_IOW(DRM_COMMAND_BASE + DRM_PANFROST_PERFCNT_DUMP, struct drm_panfrost_perfcnt_dump)
#define PANFROST_JD_REQ_FS (1 << 0)
#define PANFROST_JD_REQ_CYCLE_COUNT (1 << 1)
/**
* struct drm_panfrost_submit - ioctl argument for submitting commands to the 3D
* engine.