[PATCH v2] drm/msm: Add syncobj support.
Bas Nieuwenhuizen
bas at basnieuwenhuizen.nl
Thu Jan 16 23:04:17 UTC 2020
This
1) Enables core DRM syncobj support.
2) Adds options to the submission ioctl to wait/signal syncobjs.
Just like the wait fence fd, this does inline waits. Using the
scheduler would be nice but I believe it is out of scope for
this work.
Support for timeline syncobjs is implemented and the interface
is ready for it, but I'm not enabling it yet until there is
some code for turnip to use it.
The reset is mostly in there because in the presence of waiting
and signalling the same semaphores, resetting them after
signalling can become very annoying.
v2:
- Fixed style issues
- Removed a cleanup issue in a failure case
- Moved to a copy_from_user per syncobj
Signed-off-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
---
drivers/gpu/drm/msm/msm_drv.c | 6 +-
drivers/gpu/drm/msm/msm_gem_submit.c | 236 ++++++++++++++++++++++++++-
include/uapi/drm/msm_drm.h | 24 ++-
3 files changed, 262 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index c84f0a8b3f2c..5246b41798df 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -37,9 +37,10 @@
* - 1.4.0 - softpin, MSM_RELOC_BO_DUMP, and GEM_INFO support to set/get
* GEM object's debug name
* - 1.5.0 - Add SUBMITQUERY_QUERY ioctl
+ * - 1.6.0 - Syncobj support
*/
#define MSM_VERSION_MAJOR 1
-#define MSM_VERSION_MINOR 5
+#define MSM_VERSION_MINOR 6
#define MSM_VERSION_PATCHLEVEL 0
static const struct drm_mode_config_funcs mode_config_funcs = {
@@ -988,7 +989,8 @@ static struct drm_driver msm_driver = {
.driver_features = DRIVER_GEM |
DRIVER_RENDER |
DRIVER_ATOMIC |
- DRIVER_MODESET,
+ DRIVER_MODESET |
+ DRIVER_SYNCOBJ,
.open = msm_open,
.postclose = msm_postclose,
.lastclose = drm_fb_helper_lastclose,
diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index be5327af16fa..6c7f95fc5cfd 100644
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -8,7 +8,9 @@
#include <linux/sync_file.h>
#include <linux/uaccess.h>
+#include <drm/drm_drv.h>
#include <drm/drm_file.h>
+#include <drm/drm_syncobj.h>
#include "msm_drv.h"
#include "msm_gpu.h"
@@ -394,6 +396,191 @@ static void submit_cleanup(struct msm_gem_submit *submit)
ww_acquire_fini(&submit->ticket);
}
+
+struct msm_submit_post_dep {
+ struct drm_syncobj *syncobj;
+ uint64_t point;
+ struct dma_fence_chain *chain;
+};
+
+static int msm_wait_deps(struct drm_device *dev,
+ struct drm_file *file,
+ uint64_t in_syncobjs_addr,
+ uint32_t nr_in_syncobjs,
+ uint32_t syncobj_stride,
+ struct msm_ringbuffer *ring,
+ struct drm_syncobj ***syncobjs)
+{
+ struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
+ int ret = 0;
+ uint32_t i, j;
+
+ *syncobjs = kcalloc(nr_in_syncobjs, sizeof(**syncobjs),
+ GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
+ if (!syncobjs) {
+ ret = -ENOMEM;
+ goto out_syncobjs;
+ }
+
+ for (i = 0; i < nr_in_syncobjs; ++i) {
+ uint64_t address = in_syncobjs_addr + i * syncobj_stride;
+ struct dma_fence *fence;
+
+ if (copy_from_user(&syncobj_desc,
+ u64_to_user_ptr(address),
+ min(syncobj_stride, sizeof(syncobj_desc)))) {
+ ret = -EFAULT;
+ goto out_syncobjs;
+ }
+
+ if (syncobj_desc.point &&
+ !drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE)) {
+ ret = -EOPNOTSUPP;
+ break;
+ }
+
+ if (syncobj_desc.flags & ~MSM_SUBMIT_SYNCOBJ_FLAGS) {
+ ret = -EINVAL;
+ break;
+ }
+
+ ret = drm_syncobj_find_fence(file, syncobj_desc.handle,
+ syncobj_desc.point, 0, &fence);
+ if (ret)
+ break;
+
+ if (!dma_fence_match_context(fence, ring->fctx->context))
+ ret = dma_fence_wait(fence, true);
+
+ dma_fence_put(fence);
+ if (ret)
+ break;
+
+ if (syncobj_desc.flags & MSM_SUBMIT_SYNCOBJ_RESET) {
+ (*syncobjs)[i] =
+ drm_syncobj_find(file, syncobj_desc.handle);
+ if (!(*syncobjs)[i]) {
+ ret = -EINVAL;
+ break;
+ }
+ }
+ }
+
+out_syncobjs:
+ if (ret && *syncobjs) {
+ for (j = 0; j < i; ++j) {
+ if ((*syncobjs)[j])
+ drm_syncobj_put((*syncobjs)[j]);
+ }
+ kfree(*syncobjs);
+ *syncobjs = NULL;
+ }
+ return ret;
+}
+
+static void msm_reset_syncobjs(struct drm_syncobj **syncobjs,
+ uint32_t nr_syncobjs)
+{
+ uint32_t i;
+
+ for (i = 0; syncobjs && i < nr_syncobjs; ++i) {
+ if (syncobjs[i])
+ drm_syncobj_replace_fence(syncobjs[i], NULL);
+ }
+}
+
+static int msm_parse_post_deps(struct drm_device *dev,
+ struct drm_file *file,
+ uint64_t out_syncobjs_addr,
+ uint32_t nr_out_syncobjs,
+ uint32_t syncobj_stride,
+ struct msm_submit_post_dep **post_deps)
+{
+ int ret = 0;
+ uint32_t i, j;
+
+ *post_deps = kmalloc_array(nr_out_syncobjs, sizeof(**post_deps),
+ GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
+ if (!*post_deps) {
+ ret = -ENOMEM;
+ goto out_syncobjs;
+ }
+
+ for (i = 0; i < nr_out_syncobjs; ++i) {
+ uint64_t address = out_syncobjs_addr + i * syncobj_stride;
+
+ if (copy_from_user(&syncobj_desc,
+ u64_to_user_ptr(address),
+ min(syncobj_stride, sizeof(syncobj_desc)))) {
+ ret = -EFAULT;
+ goto out_syncobjs;
+ }
+
+ (*post_deps)[i].point = syncobj_desc.point;
+ (*post_deps)[i].chain = NULL;
+
+ if (syncobj_desc.flags) {
+ ret = -EINVAL;
+ break;
+ }
+
+ if (syncobj_desc.point) {
+ if (!drm_core_check_feature(dev,
+ DRIVER_SYNCOBJ_TIMELINE)) {
+ ret = -EOPNOTSUPP;
+ break;
+ }
+
+ (*post_deps)[i].chain =
+ kmalloc(sizeof(*(*post_deps)[i].chain),
+ GFP_KERNEL);
+ if (!(*post_deps)[i].chain) {
+ ret = -ENOMEM;
+ break;
+ }
+ }
+
+ (*post_deps)[i].syncobj =
+ drm_syncobj_find(file, syncobj_desc.handle);
+ if (!(*post_deps)[i].syncobj) {
+ ret = -EINVAL;
+ break;
+ }
+ }
+
+ if (ret) {
+ for (j = 0; j <= i; ++j) {
+ kfree((*post_deps)[j].chain);
+ if ((*post_deps)[j].syncobj)
+ drm_syncobj_put((*post_deps)[j].syncobj);
+ }
+
+ kfree(*post_deps);
+ *post_deps = NULL;
+ }
+
+out_syncobjs:
+ return ret;
+}
+
+static void msm_process_post_deps(struct msm_submit_post_dep *post_deps,
+ uint32_t count, struct dma_fence *fence)
+{
+ uint32_t i;
+
+ for (i = 0; post_deps && i < count; ++i) {
+ if (post_deps[i].chain) {
+ drm_syncobj_add_point(post_deps[i].syncobj,
+ post_deps[i].chain,
+ fence, post_deps[i].point);
+ post_deps[i].chain = NULL;
+ } else {
+ drm_syncobj_replace_fence(post_deps[i].syncobj,
+ fence);
+ }
+ }
+}
+
int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
struct drm_file *file)
{
@@ -406,6 +593,8 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
struct sync_file *sync_file = NULL;
struct msm_gpu_submitqueue *queue;
struct msm_ringbuffer *ring;
+ struct msm_submit_post_dep *post_deps = NULL;
+ struct drm_syncobj **syncobjs_to_reset = NULL;
int out_fence_fd = -1;
struct pid *pid = get_pid(task_pid(current));
unsigned i;
@@ -413,6 +602,9 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
if (!gpu)
return -ENXIO;
+ if (args->pad)
+ return -EINVAL;
+
/* for now, we just have 3d pipe.. eventually this would need to
* be more clever to dispatch to appropriate gpu module:
*/
@@ -460,9 +652,28 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
return ret;
}
+ if (args->flags & MSM_SUBMIT_SYNCOBJ_IN) {
+ ret = msm_wait_deps(dev, file,
+ args->in_syncobjs, args->nr_in_syncobjs,
+ args->syncobj_stride, ring,
+ &syncobjs_to_reset);
+ if (ret)
+ goto out_post_unlock;
+ }
+
+ if (args->flags & MSM_SUBMIT_SYNCOBJ_OUT) {
+ ret = msm_parse_post_deps(dev, file,
+ args->out_syncobjs,
+ args->nr_out_syncobjs,
+ args->syncobj_stride,
+ &post_deps);
+ if (ret)
+ goto out_post_unlock;
+ }
+
ret = mutex_lock_interruptible(&dev->struct_mutex);
if (ret)
- return ret;
+ goto out_post_unlock;
if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
@@ -586,6 +797,11 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
args->fence_fd = out_fence_fd;
}
+ msm_reset_syncobjs(syncobjs_to_reset, args->nr_in_syncobjs);
+ msm_process_post_deps(post_deps, args->nr_out_syncobjs,
+ submit->fence);
+
+
out:
submit_cleanup(submit);
if (ret)
@@ -594,5 +810,23 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
if (ret && (out_fence_fd >= 0))
put_unused_fd(out_fence_fd);
mutex_unlock(&dev->struct_mutex);
+
+out_post_unlock:
+ if (post_deps) {
+ for (i = 0; i < args->nr_out_syncobjs; ++i) {
+ kfree(post_deps[i].chain);
+ drm_syncobj_put(post_deps[i].syncobj);
+ }
+ kfree(post_deps);
+ }
+
+ if (syncobjs_to_reset) {
+ for (i = 0; i < args->nr_in_syncobjs; ++i) {
+ if (syncobjs_to_reset[i])
+ drm_syncobj_put(syncobjs_to_reset[i]);
+ }
+ kfree(syncobjs_to_reset);
+ }
+
return ret;
}
diff --git a/include/uapi/drm/msm_drm.h b/include/uapi/drm/msm_drm.h
index 0b85ed6a3710..19806eb3a8e8 100644
--- a/include/uapi/drm/msm_drm.h
+++ b/include/uapi/drm/msm_drm.h
@@ -217,13 +217,28 @@ struct drm_msm_gem_submit_bo {
#define MSM_SUBMIT_FENCE_FD_IN 0x40000000 /* enable input fence_fd */
#define MSM_SUBMIT_FENCE_FD_OUT 0x20000000 /* enable output fence_fd */
#define MSM_SUBMIT_SUDO 0x10000000 /* run submitted cmds from RB */
+#define MSM_SUBMIT_SYNCOBJ_IN 0x08000000 /* enable input syncobj */
+#define MSM_SUBMIT_SYNCOBJ_OUT 0x04000000 /* enable output syncobj */
#define MSM_SUBMIT_FLAGS ( \
MSM_SUBMIT_NO_IMPLICIT | \
MSM_SUBMIT_FENCE_FD_IN | \
MSM_SUBMIT_FENCE_FD_OUT | \
MSM_SUBMIT_SUDO | \
+ MSM_SUBMIT_SYNCOBJ_IN | \
+ MSM_SUBMIT_SYNCOBJ_OUT | \
0)
+#define MSM_SUBMIT_SYNCOBJ_RESET 0x00000001 /* Reset syncobj after wait. */
+#define MSM_SUBMIT_SYNCOBJ_FLAGS ( \
+ MSM_SUBMIT_SYNCOBJ_RESET | \
+ 0)
+
+struct drm_msm_gem_submit_syncobj {
+ __u32 handle; /* in, syncobj handle. */
+ __u32 flags; /* in, from MSM_SUBMIT_SYNCOBJ_FLAGS */
+ __u64 point; /* in, timepoint for timeline syncobjs. */
+};
+
/* Each cmdstream submit consists of a table of buffers involved, and
* one or more cmdstream buffers. This allows for conditional execution
* (context-restore), and IB buffers needed for per tile/bin draw cmds.
@@ -236,7 +251,14 @@ struct drm_msm_gem_submit {
__u64 bos; /* in, ptr to array of submit_bo's */
__u64 cmds; /* in, ptr to array of submit_cmd's */
__s32 fence_fd; /* in/out fence fd (see MSM_SUBMIT_FENCE_FD_IN/OUT) */
- __u32 queueid; /* in, submitqueue id */
+ __u32 queueid; /* in, submitqueue id */
+ __u64 in_syncobjs; /* in, ptr to to array of drm_msm_gem_submit_syncobj */
+ __u64 out_syncobjs; /* in, ptr to to array of drm_msm_gem_submit_syncobj */
+ __u32 nr_in_syncobjs; /* in, number of entries in in_syncobj */
+ __u32 nr_out_syncobjs; /* in, number of entries in out_syncobj. */
+ __u32 syncobj_stride; /* in, stride of syncobj arrays. */
+ __u32 pad; /*in, reserved for future use, always 0. */
+
};
/* The normal way to synchronize with the GPU is just to CPU_PREP on
--
2.24.1
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