[PATCH v4 13/17] drm/v3d: Create a CPU job extension for the timestamp query job
Maíra Canal
mcanal at igalia.com
Thu Nov 30 16:40:36 UTC 2023
A CPU job is a type of job that performs operations that requires CPU
intervention. A timestamp query job is a job that calculates the
query timestamp and updates the query availability by signaling a
syncobj. As V3D doesn't provide any mechanism to obtain a timestamp
from the GPU, it is a job that needs CPU intervention.
So, create a user extension for the CPU job that enables the creation
of a timestamp query job. This user extension will allow the creation of
a CPU job that performs the timestamp query calculation and updates the
timestamp BO with the proper value.
Signed-off-by: Maíra Canal <mcanal at igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral at igalia.com>
---
drivers/gpu/drm/v3d/v3d_drv.h | 17 +++++++++
drivers/gpu/drm/v3d/v3d_sched.c | 40 +++++++++++++++++++-
drivers/gpu/drm/v3d/v3d_submit.c | 63 ++++++++++++++++++++++++++++++++
include/uapi/drm/v3d_drm.h | 30 +++++++++++++++
4 files changed, 149 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/v3d/v3d_drv.h b/drivers/gpu/drm/v3d/v3d_drv.h
index 202c0d4b04a5..dd86e745c260 100644
--- a/drivers/gpu/drm/v3d/v3d_drv.h
+++ b/drivers/gpu/drm/v3d/v3d_drv.h
@@ -318,6 +318,15 @@ struct v3d_csd_job {
enum v3d_cpu_job_type {
V3D_CPU_JOB_TYPE_INDIRECT_CSD = 1,
+ V3D_CPU_JOB_TYPE_TIMESTAMP_QUERY,
+};
+
+struct v3d_timestamp_query {
+ /* Offset of this query in the timestamp BO for its value. */
+ u32 offset;
+
+ /* Syncobj that indicates the timestamp availability */
+ struct drm_syncobj *syncobj;
};
struct v3d_indirect_csd_info {
@@ -345,12 +354,20 @@ struct v3d_indirect_csd_info {
struct ww_acquire_ctx acquire_ctx;
};
+struct v3d_timestamp_query_info {
+ struct v3d_timestamp_query *queries;
+
+ u32 count;
+};
+
struct v3d_cpu_job {
struct v3d_job base;
enum v3d_cpu_job_type job_type;
struct v3d_indirect_csd_info indirect_csd;
+
+ struct v3d_timestamp_query_info timestamp_query;
};
typedef void (*v3d_cpu_job_fn)(struct v3d_cpu_job *);
diff --git a/drivers/gpu/drm/v3d/v3d_sched.c b/drivers/gpu/drm/v3d/v3d_sched.c
index 597e4ec3d28d..f4cffefb6398 100644
--- a/drivers/gpu/drm/v3d/v3d_sched.c
+++ b/drivers/gpu/drm/v3d/v3d_sched.c
@@ -21,6 +21,8 @@
#include <linux/sched/clock.h>
#include <linux/kthread.h>
+#include <drm/drm_syncobj.h>
+
#include "v3d_drv.h"
#include "v3d_regs.h"
#include "v3d_trace.h"
@@ -71,6 +73,21 @@ v3d_sched_job_free(struct drm_sched_job *sched_job)
v3d_job_cleanup(job);
}
+static void
+v3d_cpu_job_free(struct drm_sched_job *sched_job)
+{
+ struct v3d_cpu_job *job = to_cpu_job(sched_job);
+ struct v3d_timestamp_query_info *timestamp_query = &job->timestamp_query;
+
+ if (timestamp_query->queries) {
+ for (int i = 0; i < timestamp_query->count; i++)
+ drm_syncobj_put(timestamp_query->queries[i].syncobj);
+ kvfree(timestamp_query->queries);
+ }
+
+ v3d_job_cleanup(&job->base);
+}
+
static void
v3d_switch_perfmon(struct v3d_dev *v3d, struct v3d_job *job)
{
@@ -305,8 +322,29 @@ v3d_rewrite_csd_job_wg_counts_from_indirect(struct v3d_cpu_job *job)
v3d_put_bo_vaddr(bo);
}
+static void
+v3d_timestamp_query(struct v3d_cpu_job *job)
+{
+ struct v3d_timestamp_query_info *timestamp_query = &job->timestamp_query;
+ struct v3d_bo *bo = to_v3d_bo(job->base.bo[0]);
+ u8 *value_addr;
+
+ v3d_get_bo_vaddr(bo);
+
+ for (int i = 0; i < timestamp_query->count; i++) {
+ value_addr = ((u8 *) bo->vaddr) + timestamp_query->queries[i].offset;
+ *((u64 *) value_addr) = i == 0 ? ktime_get_ns() : 0ull;
+
+ drm_syncobj_replace_fence(timestamp_query->queries[i].syncobj,
+ job->base.done_fence);
+ }
+
+ v3d_put_bo_vaddr(bo);
+}
+
static const v3d_cpu_job_fn cpu_job_function[] = {
[V3D_CPU_JOB_TYPE_INDIRECT_CSD] = v3d_rewrite_csd_job_wg_counts_from_indirect,
+ [V3D_CPU_JOB_TYPE_TIMESTAMP_QUERY] = v3d_timestamp_query,
};
static struct dma_fence *
@@ -504,7 +542,7 @@ static const struct drm_sched_backend_ops v3d_cache_clean_sched_ops = {
static const struct drm_sched_backend_ops v3d_cpu_sched_ops = {
.run_job = v3d_cpu_job_run,
.timedout_job = v3d_generic_job_timedout,
- .free_job = v3d_sched_job_free
+ .free_job = v3d_cpu_job_free
};
int
diff --git a/drivers/gpu/drm/v3d/v3d_submit.c b/drivers/gpu/drm/v3d/v3d_submit.c
index 0320695b941b..83e029e786ea 100644
--- a/drivers/gpu/drm/v3d/v3d_submit.c
+++ b/drivers/gpu/drm/v3d/v3d_submit.c
@@ -433,6 +433,64 @@ v3d_get_cpu_indirect_csd_params(struct drm_file *file_priv,
NULL, &info->acquire_ctx);
}
+/* Get data for the query timestamp job submission. */
+static int
+v3d_get_cpu_timestamp_query_params(struct drm_file *file_priv,
+ struct drm_v3d_extension __user *ext,
+ struct v3d_cpu_job *job)
+{
+ u32 __user *offsets, *syncs;
+ struct drm_v3d_timestamp_query timestamp;
+
+ if (!job) {
+ DRM_DEBUG("CPU job extension was attached to a GPU job.\n");
+ return -EINVAL;
+ }
+
+ if (job->job_type) {
+ DRM_DEBUG("Two CPU job extensions were added to the same CPU job.\n");
+ return -EINVAL;
+ }
+
+ if (copy_from_user(×tamp, ext, sizeof(timestamp)))
+ return -EFAULT;
+
+ if (timestamp.pad)
+ return -EINVAL;
+
+ job->job_type = V3D_CPU_JOB_TYPE_TIMESTAMP_QUERY;
+
+ job->timestamp_query.queries = kvmalloc_array(timestamp.count,
+ sizeof(struct v3d_timestamp_query),
+ GFP_KERNEL);
+ if (!job->timestamp_query.queries)
+ return -ENOMEM;
+
+ offsets = u64_to_user_ptr(timestamp.offsets);
+ syncs = u64_to_user_ptr(timestamp.syncs);
+
+ for (int i = 0; i < timestamp.count; i++) {
+ u32 offset, sync;
+
+ if (copy_from_user(&offset, offsets++, sizeof(offset))) {
+ kvfree(job->timestamp_query.queries);
+ return -EFAULT;
+ }
+
+ job->timestamp_query.queries[i].offset = offset;
+
+ if (copy_from_user(&sync, syncs++, sizeof(sync))) {
+ kvfree(job->timestamp_query.queries);
+ return -EFAULT;
+ }
+
+ job->timestamp_query.queries[i].syncobj = drm_syncobj_find(file_priv, sync);
+ }
+ job->timestamp_query.count = timestamp.count;
+
+ return 0;
+}
+
/* Whenever userspace sets ioctl extensions, v3d_get_extensions parses data
* according to the extension id (name).
*/
@@ -461,6 +519,9 @@ v3d_get_extensions(struct drm_file *file_priv,
case DRM_V3D_EXT_ID_CPU_INDIRECT_CSD:
ret = v3d_get_cpu_indirect_csd_params(file_priv, user_ext, job);
break;
+ case DRM_V3D_EXT_ID_CPU_TIMESTAMP_QUERY:
+ ret = v3d_get_cpu_timestamp_query_params(file_priv, user_ext, job);
+ break;
default:
DRM_DEBUG_DRIVER("Unknown extension id: %d\n", ext.id);
return -EINVAL;
@@ -837,6 +898,7 @@ v3d_submit_csd_ioctl(struct drm_device *dev, void *data,
static const unsigned int cpu_job_bo_handle_count[] = {
[V3D_CPU_JOB_TYPE_INDIRECT_CSD] = 1,
+ [V3D_CPU_JOB_TYPE_TIMESTAMP_QUERY] = 1,
};
/**
@@ -974,6 +1036,7 @@ v3d_submit_cpu_ioctl(struct drm_device *dev, void *data,
v3d_job_cleanup((void *)csd_job);
v3d_job_cleanup(clean_job);
v3d_put_multisync_post_deps(&se);
+ kvfree(cpu_job->timestamp_query.queries);
return ret;
}
diff --git a/include/uapi/drm/v3d_drm.h b/include/uapi/drm/v3d_drm.h
index 0c0f47782528..239801b5e117 100644
--- a/include/uapi/drm/v3d_drm.h
+++ b/include/uapi/drm/v3d_drm.h
@@ -73,6 +73,7 @@ struct drm_v3d_extension {
__u32 id;
#define DRM_V3D_EXT_ID_MULTI_SYNC 0x01
#define DRM_V3D_EXT_ID_CPU_INDIRECT_CSD 0x02
+#define DRM_V3D_EXT_ID_CPU_TIMESTAMP_QUERY 0x03
__u32 flags; /* mbz */
};
@@ -400,11 +401,40 @@ struct drm_v3d_indirect_csd {
__u32 wg_uniform_offsets[3];
};
+/**
+ * struct drm_v3d_timestamp_query - ioctl extension for the CPU job to calculate
+ * a timestamp query
+ *
+ * When an extension DRM_V3D_EXT_ID_TIMESTAMP_QUERY is defined, it points to
+ * this extension to define a timestamp query submission. This CPU job will
+ * calculate the timestamp query and update the query value within the
+ * timestamp BO. Moreover, it will signal the timestamp syncobj to indicate
+ * query availability.
+ */
+struct drm_v3d_timestamp_query {
+ struct drm_v3d_extension base;
+
+ /* Array of queries' offsets within the timestamp BO for their value */
+ __u64 offsets;
+
+ /* Array of timestamp's syncobjs to indicate its availability */
+ __u64 syncs;
+
+ /* Number of queries */
+ __u32 count;
+
+ /* mbz */
+ __u32 pad;
+};
+
struct drm_v3d_submit_cpu {
/* Pointer to a u32 array of the BOs that are referenced by the job.
*
* For DRM_V3D_EXT_ID_CPU_INDIRECT_CSD, it must contain only one BO,
* that contains the workgroup counts.
+ *
+ * For DRM_V3D_EXT_ID_TIMESTAMP_QUERY, it must contain only one BO,
+ * that will contain the timestamp.
*/
__u64 bo_handles;
--
2.42.0
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