[Intel-gfx] [PATCH 0/3] drm/i915: timeline semaphore support

[Intel-gfx] [PATCH 0/3] drm/i915: timeline semaphore support

[Lionel Landwerlin]

Hi all,

Hopefully last CI run with the IGT tests :)

Test-with: 20200803135851.316355-1-lionel.g.landwerlin@intel.com

Cheers,

Lionel Landwerlin (3):
  drm/i915: introduce a mechanism to extend execbuf2
  drm/i915: add syncobj timeline support
  drm/i915: peel dma-fence-chains wait fences

 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    | 333 +++++++++++++++---
 drivers/gpu/drm/i915/i915_drv.c               |   3 +-
 drivers/gpu/drm/i915/i915_getparam.c          |   1 +
 include/uapi/drm/i915_drm.h                   |  65 +++-
 4 files changed, 342 insertions(+), 60 deletions(-)

--
2.28.0
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[Intel-gfx] [PATCH 1/3] drm/i915: introduce a mechanism to extend execbuf2

[Lionel Landwerlin]

We're planning to use this for a couple of new feature where we need
to provide additional parameters to execbuf.

v2: Check for invalid flags in execbuffer2 (Lionel)

v3: Rename I915_EXEC_EXT -> I915_EXEC_USE_EXTENSIONS (Chris)

v4: Rebase
    Move array fence parsing in i915_gem_do_execbuffer()

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> (v1)
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    | 131 +++++++++++-------
 include/uapi/drm/i915_drm.h                   |  26 +++-
 2 files changed, 103 insertions(+), 54 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 07cb2dd0f795..ed8d1c2517f6 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -26,6 +26,7 @@
 #include "i915_gem_ioctls.h"
 #include "i915_sw_fence_work.h"
 #include "i915_trace.h"
+#include "i915_user_extensions.h"
 
 struct eb_vma {
 	struct i915_vma *vma;
@@ -281,6 +282,13 @@ struct i915_execbuffer {
 	int lut_size;
 	struct hlist_head *buckets; /** ht for relocation handles */
 	struct eb_vma_array *array;
+
+	struct i915_eb_fence {
+		struct drm_syncobj *syncobj; /* Use with ptr_mask_bits() */
+	} *fences;
+	u32 n_fences;
+
+	u64 extension_flags; /** Available extensions parameters */
 };
 
 static inline bool eb_use_cmdparser(const struct i915_execbuffer *eb)
@@ -1622,7 +1630,8 @@ static int i915_gem_check_execbuffer(struct drm_i915_gem_execbuffer2 *exec)
 		return -EINVAL;
 
 	/* Kernel clipping was a DRI1 misfeature */
-	if (!(exec->flags & I915_EXEC_FENCE_ARRAY)) {
+	if (!(exec->flags & (I915_EXEC_FENCE_ARRAY |
+			     I915_EXEC_USE_EXTENSIONS))) {
 		if (exec->num_cliprects || exec->cliprects_ptr)
 			return -EINVAL;
 	}
@@ -2189,41 +2198,41 @@ eb_pin_engine(struct i915_execbuffer *eb,
 }
 
 static void
-__free_fence_array(struct drm_syncobj **fences, unsigned int n)
+__free_fence_array(struct i915_eb_fence *fences, unsigned int n)
 {
 	while (n--)
-		drm_syncobj_put(ptr_mask_bits(fences[n], 2));
+		drm_syncobj_put(ptr_mask_bits(fences[n].syncobj, 2));
 	kvfree(fences);
 }
 
-static struct drm_syncobj **
+static int
 get_fence_array(struct drm_i915_gem_execbuffer2 *args,
-		struct drm_file *file)
+		struct i915_execbuffer *eb)
 {
 	const unsigned long nfences = args->num_cliprects;
 	struct drm_i915_gem_exec_fence __user *user;
-	struct drm_syncobj **fences;
+	struct i915_eb_fence *fences;
 	unsigned long n;
 	int err;
 
 	if (!(args->flags & I915_EXEC_FENCE_ARRAY))
-		return NULL;
+		return 0;
 
 	/* Check multiplication overflow for access_ok() and kvmalloc_array() */
 	BUILD_BUG_ON(sizeof(size_t) > sizeof(unsigned long));
 	if (nfences > min_t(unsigned long,
 			    ULONG_MAX / sizeof(*user),
 			    SIZE_MAX / sizeof(*fences)))
-		return ERR_PTR(-EINVAL);
+		return -EINVAL;
 
 	user = u64_to_user_ptr(args->cliprects_ptr);
 	if (!access_ok(user, nfences * sizeof(*user)))
-		return ERR_PTR(-EFAULT);
+		return -EFAULT;
 
 	fences = kvmalloc_array(nfences, sizeof(*fences),
 				__GFP_NOWARN | GFP_KERNEL);
 	if (!fences)
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
 
 	for (n = 0; n < nfences; n++) {
 		struct drm_i915_gem_exec_fence fence;
@@ -2239,7 +2248,7 @@ get_fence_array(struct drm_i915_gem_execbuffer2 *args,
 			goto err;
 		}
 
-		syncobj = drm_syncobj_find(file, fence.handle);
+		syncobj = drm_syncobj_find(eb->file, fence.handle);
 		if (!syncobj) {
 			DRM_DEBUG("Invalid syncobj handle provided\n");
 			err = -ENOENT;
@@ -2249,38 +2258,31 @@ get_fence_array(struct drm_i915_gem_execbuffer2 *args,
 		BUILD_BUG_ON(~(ARCH_KMALLOC_MINALIGN - 1) &
 			     ~__I915_EXEC_FENCE_UNKNOWN_FLAGS);
 
-		fences[n] = ptr_pack_bits(syncobj, fence.flags, 2);
+		fences[n].syncobj = ptr_pack_bits(syncobj, fence.flags, 2);
 	}
 
-	return fences;
+	eb->fences = fences;
+	eb->n_fences = nfences;
+
+	return 0;
 
 err:
 	__free_fence_array(fences, n);
-	return ERR_PTR(err);
-}
-
-static void
-put_fence_array(struct drm_i915_gem_execbuffer2 *args,
-		struct drm_syncobj **fences)
-{
-	if (fences)
-		__free_fence_array(fences, args->num_cliprects);
+	return err;
 }
 
 static int
-await_fence_array(struct i915_execbuffer *eb,
-		  struct drm_syncobj **fences)
+await_fence_array(struct i915_execbuffer *eb)
 {
-	const unsigned int nfences = eb->args->num_cliprects;
 	unsigned int n;
 	int err;
 
-	for (n = 0; n < nfences; n++) {
+	for (n = 0; n < eb->n_fences; n++) {
 		struct drm_syncobj *syncobj;
 		struct dma_fence *fence;
 		unsigned int flags;
 
-		syncobj = ptr_unpack_bits(fences[n], &flags, 2);
+		syncobj = ptr_unpack_bits(eb->fences[n].syncobj, &flags, 2);
 		if (!(flags & I915_EXEC_FENCE_WAIT))
 			continue;
 
@@ -2298,18 +2300,16 @@ await_fence_array(struct i915_execbuffer *eb,
 }
 
 static void
-signal_fence_array(struct i915_execbuffer *eb,
-		   struct drm_syncobj **fences)
+signal_fence_array(struct i915_execbuffer *eb)
 {
-	const unsigned int nfences = eb->args->num_cliprects;
 	struct dma_fence * const fence = &eb->request->fence;
 	unsigned int n;
 
-	for (n = 0; n < nfences; n++) {
+	for (n = 0; n < eb->n_fences; n++) {
 		struct drm_syncobj *syncobj;
 		unsigned int flags;
 
-		syncobj = ptr_unpack_bits(fences[n], &flags, 2);
+		syncobj = ptr_unpack_bits(eb->fences[n].syncobj, &flags, 2);
 		if (!(flags & I915_EXEC_FENCE_SIGNAL))
 			continue;
 
@@ -2358,12 +2358,38 @@ static void eb_request_add(struct i915_execbuffer *eb)
 	mutex_unlock(&tl->mutex);
 }
 
+static const i915_user_extension_fn execbuf_extensions[] = {
+};
+
+static int
+parse_execbuf2_extensions(struct drm_i915_gem_execbuffer2 *args,
+			  struct i915_execbuffer *eb)
+{
+	eb->extension_flags = 0;
+
+	if (!(args->flags & I915_EXEC_USE_EXTENSIONS))
+		return 0;
+
+	/* The execbuf2 extension mechanism reuses cliprects_ptr. So we cannot
+	 * have another flag also using it at the same time.
+	 */
+	if (eb->args->flags & I915_EXEC_FENCE_ARRAY)
+		return -EINVAL;
+
+	if (args->num_cliprects != 0)
+		return -EINVAL;
+
+	return i915_user_extensions(u64_to_user_ptr(args->cliprects_ptr),
+				    execbuf_extensions,
+				    ARRAY_SIZE(execbuf_extensions),
+				    eb);
+}
+
 static int
 i915_gem_do_execbuffer(struct drm_device *dev,
 		       struct drm_file *file,
 		       struct drm_i915_gem_execbuffer2 *args,
-		       struct drm_i915_gem_exec_object2 *exec,
-		       struct drm_syncobj **fences)
+		       struct drm_i915_gem_exec_object2 *exec)
 {
 	struct drm_i915_private *i915 = to_i915(dev);
 	struct i915_execbuffer eb;
@@ -2393,6 +2419,9 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 	eb.batch_len = args->batch_len;
 	eb.trampoline = NULL;
 
+	eb.fences = NULL;
+	eb.n_fences = 0;
+
 	eb.batch_flags = 0;
 	if (args->flags & I915_EXEC_SECURE) {
 		if (INTEL_GEN(i915) >= 11)
@@ -2429,10 +2458,18 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 		}
 	}
 
-	err = eb_create(&eb);
+	err = parse_execbuf2_extensions(args, &eb);
 	if (err)
 		goto err_out_fence;
 
+	err = get_fence_array(args, &eb);
+	if (err)
+		goto err_arr_fence;
+
+	err = eb_create(&eb);
+	if (err)
+		goto err_arr_fence;
+
 	GEM_BUG_ON(!eb.lut_size);
 
 	err = eb_select_context(&eb);
@@ -2527,8 +2564,8 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 			goto err_request;
 	}
 
-	if (fences) {
-		err = await_fence_array(&eb, fences);
+	if (eb.n_fences) {
+		err = await_fence_array(&eb);
 		if (err)
 			goto err_request;
 	}
@@ -2558,8 +2595,8 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 	i915_request_get(eb.request);
 	eb_request_add(&eb);
 
-	if (fences)
-		signal_fence_array(&eb, fences);
+	if (eb.n_fences)
+		signal_fence_array(&eb);
 
 	if (out_fence) {
 		if (err == 0) {
@@ -2587,6 +2624,8 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 	i915_gem_context_put(eb.gem_context);
 err_destroy:
 	eb_destroy(&eb);
+err_arr_fence:
+	__free_fence_array(eb.fences, eb.n_fences);
 err_out_fence:
 	if (out_fence_fd != -1)
 		put_unused_fd(out_fence_fd);
@@ -2686,7 +2725,7 @@ i915_gem_execbuffer_ioctl(struct drm_device *dev, void *data,
 			exec2_list[i].flags = 0;
 	}
 
-	err = i915_gem_do_execbuffer(dev, file, &exec2, exec2_list, NULL);
+	err = i915_gem_do_execbuffer(dev, file, &exec2, exec2_list);
 	if (exec2.flags & __EXEC_HAS_RELOC) {
 		struct drm_i915_gem_exec_object __user *user_exec_list =
 			u64_to_user_ptr(args->buffers_ptr);
@@ -2718,7 +2757,6 @@ i915_gem_execbuffer2_ioctl(struct drm_device *dev, void *data,
 	struct drm_i915_private *i915 = to_i915(dev);
 	struct drm_i915_gem_execbuffer2 *args = data;
 	struct drm_i915_gem_exec_object2 *exec2_list;
-	struct drm_syncobj **fences = NULL;
 	const size_t count = args->buffer_count;
 	int err;
 
@@ -2746,15 +2784,7 @@ i915_gem_execbuffer2_ioctl(struct drm_device *dev, void *data,
 		return -EFAULT;
 	}
 
-	if (args->flags & I915_EXEC_FENCE_ARRAY) {
-		fences = get_fence_array(args, file);
-		if (IS_ERR(fences)) {
-			kvfree(exec2_list);
-			return PTR_ERR(fences);
-		}
-	}
-
-	err = i915_gem_do_execbuffer(dev, file, args, exec2_list, fences);
+	err = i915_gem_do_execbuffer(dev, file, args, exec2_list);
 
 	/*
 	 * Now that we have begun execution of the batchbuffer, we ignore
@@ -2795,7 +2825,6 @@ end:;
 	}
 
 	args->flags &= ~__I915_EXEC_UNKNOWN_FLAGS;
-	put_fence_array(args, fences);
 	kvfree(exec2_list);
 	return err;
 }
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 00546062e023..0efded7b15f0 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1046,6 +1046,10 @@ struct drm_i915_gem_exec_fence {
 	__u32 flags;
 };
 
+enum drm_i915_gem_execbuffer_ext {
+	DRM_I915_GEM_EXECBUFFER_EXT_MAX /* non-ABI */
+};
+
 struct drm_i915_gem_execbuffer2 {
 	/**
 	 * List of gem_exec_object2 structs
@@ -1062,8 +1066,15 @@ struct drm_i915_gem_execbuffer2 {
 	__u32 num_cliprects;
 	/**
 	 * This is a struct drm_clip_rect *cliprects if I915_EXEC_FENCE_ARRAY
-	 * is not set.  If I915_EXEC_FENCE_ARRAY is set, then this is a
-	 * struct drm_i915_gem_exec_fence *fences.
+	 * & I915_EXEC_USE_EXTENSIONS are not set.
+	 *
+	 * If I915_EXEC_FENCE_ARRAY is set, then this is a pointer to an array
+	 * of struct drm_i915_gem_exec_fence and num_cliprects is the length
+	 * of the array.
+	 *
+	 * If I915_EXEC_USE_EXTENSIONS is set, then this is a pointer to a
+	 * single struct drm_i915_gem_base_execbuffer_ext and num_cliprects is
+	 * 0.
 	 */
 	__u64 cliprects_ptr;
 #define I915_EXEC_RING_MASK              (0x3f)
@@ -1181,7 +1192,16 @@ struct drm_i915_gem_execbuffer2 {
  */
 #define I915_EXEC_FENCE_SUBMIT		(1 << 20)
 
-#define __I915_EXEC_UNKNOWN_FLAGS (-(I915_EXEC_FENCE_SUBMIT << 1))
+/*
+ * Setting I915_EXEC_USE_EXTENSIONS implies that
+ * drm_i915_gem_execbuffer2.cliprects_ptr is treated as a pointer to an linked
+ * list of i915_user_extension. Each i915_user_extension node is the base of a
+ * larger structure. The list of supported structures are listed in the
+ * drm_i915_gem_execbuffer_ext enum.
+ */
+#define I915_EXEC_USE_EXTENSIONS	(1 << 21)
+
+#define __I915_EXEC_UNKNOWN_FLAGS (-(I915_EXEC_USE_EXTENSIONS<<1))
 
 #define I915_EXEC_CONTEXT_ID_MASK	(0xffffffff)
 #define i915_execbuffer2_set_context_id(eb2, context) \
-- 
2.28.0

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[Intel-gfx] [PATCH 2/3] drm/i915: add syncobj timeline support

[Lionel Landwerlin]

Introduces a new parameters to execbuf so that we can specify syncobj
handles as well as timeline points.

v2: Reuse i915_user_extension_fn

v3: Check that the chained extension is only present once (Chris)

v4: Check that dma_fence_chain_find_seqno returns a non NULL fence (Lionel)

v5: Use BIT_ULL (Chris)

v6: Fix issue with already signaled timeline points,
    dma_fence_chain_find_seqno() setting fence to NULL (Chris)

v7: Report ENOENT with invalid syncobj handle (Lionel)

v8: Check for out of order timeline point insertion (Chris)

v9: After explanations on
    https://lists.freedesktop.org/archives/dri-devel/2019-August/229287.html
    drop the ordering check from v8 (Lionel)

v10: Set first extension enum item to 1 (Jason)

v11: Rebase

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    | 167 +++++++++++++++++-
 drivers/gpu/drm/i915/i915_drv.c               |   3 +-
 drivers/gpu/drm/i915/i915_getparam.c          |   1 +
 include/uapi/drm/i915_drm.h                   |  39 ++++
 4 files changed, 203 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index ed8d1c2517f6..1f766431f3a3 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -285,6 +285,8 @@ struct i915_execbuffer {
 
 	struct i915_eb_fence {
 		struct drm_syncobj *syncobj; /* Use with ptr_mask_bits() */
+		u64 value;
+		struct dma_fence_chain *chain_fence;
 	} *fences;
 	u32 n_fences;
 
@@ -2200,14 +2202,121 @@ eb_pin_engine(struct i915_execbuffer *eb,
 static void
 __free_fence_array(struct i915_eb_fence *fences, unsigned int n)
 {
-	while (n--)
+	while (n--) {
 		drm_syncobj_put(ptr_mask_bits(fences[n].syncobj, 2));
+		kfree(fences[n].chain_fence);
+	}
 	kvfree(fences);
 }
 
 static int
-get_fence_array(struct drm_i915_gem_execbuffer2 *args,
-		struct i915_execbuffer *eb)
+get_timeline_fence_array(const struct drm_i915_gem_execbuffer_ext_timeline_fences *timeline_fences,
+			 struct i915_execbuffer *eb)
+{
+	struct drm_i915_gem_exec_fence __user *user_fences;
+	struct i915_eb_fence *fences;
+	u64 __user *user_values;
+	u64 num_fences, num_user_fences = timeline_fences->fence_count;
+	unsigned long n;
+	int err;
+
+	/* Check multiplication overflow for access_ok() and kvmalloc_array() */
+	BUILD_BUG_ON(sizeof(size_t) > sizeof(unsigned long));
+	if (num_user_fences > min_t(unsigned long,
+				    ULONG_MAX / sizeof(*user_fences),
+				    SIZE_MAX / sizeof(*fences)))
+		return -EINVAL;
+
+	user_fences = u64_to_user_ptr(timeline_fences->handles_ptr);
+	if (!access_ok(user_fences, num_user_fences * sizeof(*user_fences)))
+		return -EFAULT;
+
+	user_values = u64_to_user_ptr(timeline_fences->values_ptr);
+	if (!access_ok(user_values, num_user_fences * sizeof(*user_values)))
+		return -EFAULT;
+
+	fences = kvmalloc_array(num_user_fences, sizeof(*fences),
+				__GFP_NOWARN | GFP_KERNEL);
+	if (!fences)
+		return -ENOMEM;
+
+	BUILD_BUG_ON(~(ARCH_KMALLOC_MINALIGN - 1) &
+		     ~__I915_EXEC_FENCE_UNKNOWN_FLAGS);
+
+	for (n = 0, num_fences = 0; n < timeline_fences->fence_count; n++) {
+		struct drm_i915_gem_exec_fence fence;
+		struct drm_syncobj *syncobj;
+		u64 point;
+
+		if (__copy_from_user(&fence, user_fences++, sizeof(fence))) {
+			err = -EFAULT;
+			goto err;
+		}
+
+		if (fence.flags & __I915_EXEC_FENCE_UNKNOWN_FLAGS) {
+			err = -EINVAL;
+			goto err;
+		}
+
+		if (__get_user(point, user_values++)) {
+			err = -EFAULT;
+			goto err;
+		}
+
+		syncobj = drm_syncobj_find(eb->file, fence.handle);
+		if (!syncobj) {
+			DRM_DEBUG("Invalid syncobj handle provided\n");
+			err = -ENOENT;
+			goto err;
+		}
+
+		/*
+		 * For timeline syncobjs we need to preallocate chains for
+		 * later signaling.
+		 */
+		if (point != 0 && fence.flags & I915_EXEC_FENCE_SIGNAL) {
+			/*
+			 * Waiting and signaling the same point (when point !=
+			 * 0) would break the timeline.
+			 */
+			if (fence.flags & I915_EXEC_FENCE_WAIT) {
+				DRM_DEBUG("Tring to wait & signal the same timeline point.\n");
+				err = -EINVAL;
+				drm_syncobj_put(syncobj);
+				goto err;
+			}
+
+			fences[num_fences].chain_fence =
+				kmalloc(sizeof(*fences[num_fences].chain_fence),
+					GFP_KERNEL);
+			if (!fences[num_fences].chain_fence) {
+				drm_syncobj_put(syncobj);
+				err = -ENOMEM;
+				DRM_DEBUG("Unable to alloc chain_fence\n");
+				goto err;
+			}
+		} else {
+			fences[num_fences].chain_fence = NULL;
+		}
+
+		fences[num_fences].syncobj = ptr_pack_bits(syncobj, fence.flags, 2);
+		fences[num_fences].value = point;
+		num_fences++;
+	}
+
+	eb->fences = fences;
+	eb->n_fences = num_fences;
+
+	return 0;
+
+err:
+	__free_fence_array(fences, num_fences);
+	return err;
+}
+
+static int
+get_legacy_fence_array(struct drm_i915_gem_execbuffer2 *args,
+		       struct i915_execbuffer *eb)
 {
 	const unsigned long nfences = args->num_cliprects;
 	struct drm_i915_gem_exec_fence __user *user;
@@ -2222,7 +2331,7 @@ get_fence_array(struct drm_i915_gem_execbuffer2 *args,
 	BUILD_BUG_ON(sizeof(size_t) > sizeof(unsigned long));
 	if (nfences > min_t(unsigned long,
 			    ULONG_MAX / sizeof(*user),
-			    SIZE_MAX / sizeof(*fences)))
+			    SIZE_MAX / sizeof(*eb->fences)))
 		return -EINVAL;
 
 	user = u64_to_user_ptr(args->cliprects_ptr);
@@ -2259,6 +2368,8 @@ get_fence_array(struct drm_i915_gem_execbuffer2 *args,
 			     ~__I915_EXEC_FENCE_UNKNOWN_FLAGS);
 
 		fences[n].syncobj = ptr_pack_bits(syncobj, fence.flags, 2);
+		fences[n].value = 0;
+		fences[n].chain_fence = NULL;
 	}
 
 	eb->fences = fences;
@@ -2290,6 +2401,15 @@ await_fence_array(struct i915_execbuffer *eb)
 		if (!fence)
 			return -EINVAL;
 
+		if (eb->fences[n].value) {
+			err = dma_fence_chain_find_seqno(&fence, eb->fences[n].value);
+			if (err)
+				return err;
+
+			if (!fence)
+				continue;
+		}
+
 		err = i915_request_await_dma_fence(eb->request, fence);
 		dma_fence_put(fence);
 		if (err < 0)
@@ -2313,7 +2433,17 @@ signal_fence_array(struct i915_execbuffer *eb)
 		if (!(flags & I915_EXEC_FENCE_SIGNAL))
 			continue;
 
-		drm_syncobj_replace_fence(syncobj, fence);
+		if (eb->fences[n].chain_fence) {
+			drm_syncobj_add_point(syncobj, eb->fences[n].chain_fence,
+					      fence, eb->fences[n].value);
+			/*
+			 * The chain's ownership is transferred to the
+			 * timeline.
+			 */
+			eb->fences[n].chain_fence = NULL;
+		} else {
+			drm_syncobj_replace_fence(syncobj, fence);
+		}
 	}
 }
 
@@ -2358,7 +2488,32 @@ static void eb_request_add(struct i915_execbuffer *eb)
 	mutex_unlock(&tl->mutex);
 }
 
+static int parse_timeline_fences(struct i915_user_extension __user *ext, void *data)
+{
+	struct drm_i915_gem_execbuffer_ext_timeline_fences timeline_fences;
+	struct i915_execbuffer *eb = data;
+
+	/* Timeline fences are incompatible with the fence array flag. */
+	if (eb->args->flags & I915_EXEC_FENCE_ARRAY)
+		return -EINVAL;
+
+	/*
+	 * Prevent the drm_i915_gem_execbuffer_ext_timeline_fences structure
+	 * to be included multiple times.
+	 */
+	if (eb->extension_flags & BIT_ULL(DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES))
+		return -EINVAL;
+
+	if (copy_from_user(&timeline_fences, ext, sizeof(timeline_fences)))
+		return -EFAULT;
+
+	eb->extension_flags |= BIT_ULL(DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES);
+
+	return get_timeline_fence_array(&timeline_fences, eb);
+}
+
 static const i915_user_extension_fn execbuf_extensions[] = {
+	[DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES] = parse_timeline_fences,
 };
 
 static int
@@ -2462,7 +2617,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 	if (err)
 		goto err_out_fence;
 
-	err = get_fence_array(args, &eb);
+	err = get_legacy_fence_array(args, &eb);
 	if (err)
 		goto err_arr_fence;
 
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 8b9bd929ba45..068447f565a9 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1846,7 +1846,8 @@ static struct drm_driver driver = {
 	 */
 	.driver_features =
 	    DRIVER_GEM |
-	    DRIVER_RENDER | DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_SYNCOBJ,
+	    DRIVER_RENDER | DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_SYNCOBJ |
+	    DRIVER_SYNCOBJ_TIMELINE,
 	.release = i915_driver_release,
 	.open = i915_driver_open,
 	.lastclose = i915_driver_lastclose,
diff --git a/drivers/gpu/drm/i915/i915_getparam.c b/drivers/gpu/drm/i915/i915_getparam.c
index 421613219ae9..f96032c60a12 100644
--- a/drivers/gpu/drm/i915/i915_getparam.c
+++ b/drivers/gpu/drm/i915/i915_getparam.c
@@ -132,6 +132,7 @@ int i915_getparam_ioctl(struct drm_device *dev, void *data,
 	case I915_PARAM_HAS_EXEC_BATCH_FIRST:
 	case I915_PARAM_HAS_EXEC_FENCE_ARRAY:
 	case I915_PARAM_HAS_EXEC_SUBMIT_FENCE:
+	case I915_PARAM_HAS_EXEC_TIMELINE_FENCES:
 		/* For the time being all of these are always true;
 		 * if some supported hardware does not have one of these
 		 * features this value needs to be provided from
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 0efded7b15f0..021276c39842 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -619,6 +619,13 @@ typedef struct drm_i915_irq_wait {
  */
 #define I915_PARAM_PERF_REVISION	54
 
+/* Query whether DRM_I915_GEM_EXECBUFFER2 supports supplying an array of
+ * timeline syncobj through drm_i915_gem_execbuf_ext_timeline_fences. See
+ * I915_EXEC_USE_EXTENSIONS.
+ */
+#define I915_PARAM_HAS_EXEC_TIMELINE_FENCES 55
+
+
 /* Must be kept compact -- no holes and well documented */
 
 typedef struct drm_i915_getparam {
@@ -1047,9 +1054,41 @@ struct drm_i915_gem_exec_fence {
 };
 
 enum drm_i915_gem_execbuffer_ext {
+	/**
+	 * See drm_i915_gem_execbuf_ext_timeline_fences.
+	 */
+	DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES = 1,
+
 	DRM_I915_GEM_EXECBUFFER_EXT_MAX /* non-ABI */
 };
 
+/**
+ * This structure describes an array of drm_syncobj and associated points for
+ * timeline variants of drm_syncobj. It is invalid to append this structure to
+ * the execbuf if I915_EXEC_FENCE_ARRAY is set.
+ */
+struct drm_i915_gem_execbuffer_ext_timeline_fences {
+	struct i915_user_extension base;
+
+	/**
+	 * Number of element in the handles_ptr & value_ptr arrays.
+	 */
+	__u64 fence_count;
+
+	/**
+	 * Pointer to an array of struct drm_i915_gem_exec_fence of length
+	 * fence_count.
+	 */
+	__u64 handles_ptr;
+
+	/**
+	 * Pointer to an array of u64 values of length fence_count. Values
+	 * must be 0 for a binary drm_syncobj. A Value of 0 for a timeline
+	 * drm_syncobj is invalid as it turns a drm_syncobj into a binary one.
+	 */
+	__u64 values_ptr;
+};
+
 struct drm_i915_gem_execbuffer2 {
 	/**
 	 * List of gem_exec_object2 structs
-- 
2.28.0

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[Intel-gfx] [PATCH] drm/i915: add syncobj timeline support

[Chris Wilson]

This is the bunch of trivial changes that I had wanted.
 - stop arbitrarily limiting the uABI to a single extension block
 - handle timeline syncobj as an extension of binary syncobj
 - num_fences to appease Tvrtko who objects to me calling things nobject
 - the only way not to have ABI values is never to expose them in the uABI
 - fix cross-reference

---
 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    | 337 +++++++++---------
 include/uapi/drm/i915_drm.h                   |  15 +-
 2 files changed, 180 insertions(+), 172 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 1f766431f3a3..9ce114d67288 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -223,6 +223,13 @@ struct eb_vma_array {
  * the batchbuffer in trusted mode, otherwise the ioctl is rejected.
  */
 
+struct eb_fence {
+	struct drm_syncobj *syncobj; /* Use with ptr_mask_bits() */
+	struct dma_fence *dma_fence;
+	u64 value;
+	struct dma_fence_chain *chain_fence;
+};
+
 struct i915_execbuffer {
 	struct drm_i915_private *i915; /** i915 backpointer */
 	struct drm_file *file; /** per-file lookup tables and limits */
@@ -283,14 +290,8 @@ struct i915_execbuffer {
 	struct hlist_head *buckets; /** ht for relocation handles */
 	struct eb_vma_array *array;
 
-	struct i915_eb_fence {
-		struct drm_syncobj *syncobj; /* Use with ptr_mask_bits() */
-		u64 value;
-		struct dma_fence_chain *chain_fence;
-	} *fences;
-	u32 n_fences;
-
-	u64 extension_flags; /** Available extensions parameters */
+	struct eb_fence *fences;
+	unsigned long num_fences;
 };
 
 static inline bool eb_use_cmdparser(const struct i915_execbuffer *eb)
@@ -2200,186 +2201,222 @@ eb_pin_engine(struct i915_execbuffer *eb,
 }
 
 static void
-__free_fence_array(struct i915_eb_fence *fences, unsigned int n)
+__free_fence_array(struct eb_fence *fences, unsigned int n)
 {
 	while (n--) {
 		drm_syncobj_put(ptr_mask_bits(fences[n].syncobj, 2));
+		dma_fence_put(fences[n].dma_fence);
 		kfree(fences[n].chain_fence);
 	}
 	kvfree(fences);
 }
 
 static int
-get_timeline_fence_array(const struct drm_i915_gem_execbuffer_ext_timeline_fences *timeline_fences,
-			 struct i915_execbuffer *eb)
+add_timeline_fence_array(struct i915_execbuffer *eb,
+			 const struct drm_i915_gem_execbuffer_ext_timeline_fences *timeline_fences)
 {
 	struct drm_i915_gem_exec_fence __user *user_fences;
-	struct i915_eb_fence *fences;
 	u64 __user *user_values;
-	u64 num_fences, num_user_fences = timeline_fences->fence_count;
-	unsigned long n;
-	int err;
+	struct eb_fence *f;
+	u64 nfences;
+	int err = 0;
+
+	nfences = timeline_fences->fence_count;
+	if (!nfences)
+		return 0;
 
 	/* Check multiplication overflow for access_ok() and kvmalloc_array() */
 	BUILD_BUG_ON(sizeof(size_t) > sizeof(unsigned long));
-	if (num_user_fences > min_t(unsigned long,
-				    ULONG_MAX / sizeof(*user_fences),
-				    SIZE_MAX / sizeof(*fences)))
+	if (nfences > min_t(unsigned long,
+			    ULONG_MAX / sizeof(*user_fences),
+			    SIZE_MAX / sizeof(*f)) - eb->num_fences)
 		return -EINVAL;
 
 	user_fences = u64_to_user_ptr(timeline_fences->handles_ptr);
-	if (!access_ok(user_fences, num_user_fences * sizeof(*user_fences)))
+	if (!access_ok(user_fences, nfences * sizeof(*user_fences)))
 		return -EFAULT;
 
 	user_values = u64_to_user_ptr(timeline_fences->values_ptr);
-	if (!access_ok(user_values, num_user_fences * sizeof(*user_values)))
+	if (!access_ok(user_values, nfences * sizeof(*user_values)))
 		return -EFAULT;
 
-	fences = kvmalloc_array(num_user_fences, sizeof(*fences),
-				__GFP_NOWARN | GFP_KERNEL);
-	if (!fences)
+	f = krealloc(eb->fences,
+		     (eb->num_fences + nfences) * sizeof(*f),
+		     __GFP_NOWARN | GFP_KERNEL);
+	if (!f)
 		return -ENOMEM;
 
+	eb->fences = f;
+	f += eb->num_fences;
+
 	BUILD_BUG_ON(~(ARCH_KMALLOC_MINALIGN - 1) &
 		     ~__I915_EXEC_FENCE_UNKNOWN_FLAGS);
 
-	for (n = 0, num_fences = 0; n < timeline_fences->fence_count; n++) {
-		struct drm_i915_gem_exec_fence fence;
+	while (nfences--) {
+		struct drm_i915_gem_exec_fence user_fence;
 		struct drm_syncobj *syncobj;
+		struct dma_fence *fence = NULL;
 		u64 point;
 
-		if (__copy_from_user(&fence, user_fences++, sizeof(fence))) {
-			err = -EFAULT;
-			goto err;
+		if (__copy_from_user(&user_fence,
+				     user_fences++,
+				     sizeof(user_fence)))
+			return -EFAULT;
+
+		if (user_fence.flags & __I915_EXEC_FENCE_UNKNOWN_FLAGS)
+			return -EINVAL;
+
+		if (__get_user(point, user_values++))
+			return -EFAULT;
+
+		syncobj = drm_syncobj_find(eb->file, user_fence.handle);
+		if (!syncobj) {
+			DRM_DEBUG("Invalid syncobj handle provided\n");
+			return -ENOENT;
 		}
 
-		if (fence.flags & __I915_EXEC_FENCE_UNKNOWN_FLAGS) {
-			err = -EINVAL;
-			goto err;
+		fence = drm_syncobj_fence_get(syncobj);
+
+		if (!fence && user_fence.flags &&
+		    !(user_fence.flags & I915_EXEC_FENCE_SIGNAL)) {
+			DRM_DEBUG("Syncobj handle has no fence\n");
+			drm_syncobj_put(syncobj);
+			return -EINVAL;
 		}
 
-		if (__get_user(point, user_values++)) {
-			err = -EFAULT;
-			goto err;
+		if (fence)
+			err = dma_fence_chain_find_seqno(&fence, point);
+
+		if (err && !(user_fence.flags & I915_EXEC_FENCE_SIGNAL)) {
+			DRM_DEBUG("Syncobj handle missing requested point %llu\n", point);
+			drm_syncobj_put(syncobj);
+			return err;
 		}
 
-		syncobj = drm_syncobj_find(eb->file, fence.handle);
-		if (!syncobj) {
-			DRM_DEBUG("Invalid syncobj handle provided\n");
-			err = -ENOENT;
-			goto err;
+		/*
+		 * A point might have been signaled already and
+		 * garbage collected from the timeline. In this case
+		 * just ignore the point and carry on.
+		 */
+		if (!fence && !(user_fence.flags & I915_EXEC_FENCE_SIGNAL)) {
+			drm_syncobj_put(syncobj);
+			continue;
 		}
 
 		/*
 		 * For timeline syncobjs we need to preallocate chains for
 		 * later signaling.
 		 */
-		if (point != 0 && fence.flags & I915_EXEC_FENCE_SIGNAL) {
+		if (point != 0 && user_fence.flags & I915_EXEC_FENCE_SIGNAL) {
 			/*
 			 * Waiting and signaling the same point (when point !=
 			 * 0) would break the timeline.
 			 */
-			if (fence.flags & I915_EXEC_FENCE_WAIT) {
-				DRM_DEBUG("Tring to wait & signal the same timeline point.\n");
-				err = -EINVAL;
+			if (user_fence.flags & I915_EXEC_FENCE_WAIT) {
+				DRM_DEBUG("Trying to wait & signal the same timeline point.\n");
+				dma_fence_put(fence);
 				drm_syncobj_put(syncobj);
-				goto err;
+				return -EINVAL;
 			}
 
-			fences[num_fences].chain_fence =
-				kmalloc(sizeof(*fences[num_fences].chain_fence),
+			f->chain_fence =
+				kmalloc(sizeof(*f->chain_fence),
 					GFP_KERNEL);
-			if (!fences[num_fences].chain_fence) {
+			if (!f->chain_fence) {
 				drm_syncobj_put(syncobj);
-				err = -ENOMEM;
-				DRM_DEBUG("Unable to alloc chain_fence\n");
-				goto err;
+				dma_fence_put(fence);
+				return -ENOMEM;
 			}
 		} else {
-			fences[num_fences].chain_fence = NULL;
+			f->chain_fence = NULL;
 		}
 
-		fences[num_fences].syncobj = ptr_pack_bits(syncobj, fence.flags, 2);
-		fences[num_fences].value = point;
-		num_fences++;
+		f->syncobj = ptr_pack_bits(syncobj, user_fence.flags, 2);
+		f->dma_fence = fence;
+		f->value = point;
+		f++;
+		eb->num_fences++;
 	}
 
-	eb->fences = fences;
-	eb->n_fences = num_fences;
-
 	return 0;
-
-err:
-	__free_fence_array(fences, num_fences);
-	return err;
 }
 
-static int
-get_legacy_fence_array(struct drm_i915_gem_execbuffer2 *args,
-		       struct i915_execbuffer *eb)
+static int add_fence_array(struct i915_execbuffer *eb)
 {
-	const unsigned long nfences = args->num_cliprects;
+	struct drm_i915_gem_execbuffer2 *args = eb->args;
 	struct drm_i915_gem_exec_fence __user *user;
-	struct i915_eb_fence *fences;
-	unsigned long n;
-	int err;
+	unsigned long num_fences = args->num_cliprects;
+	struct eb_fence *f;
 
 	if (!(args->flags & I915_EXEC_FENCE_ARRAY))
 		return 0;
 
+	if (!num_fences)
+		return 0;
+
 	/* Check multiplication overflow for access_ok() and kvmalloc_array() */
 	BUILD_BUG_ON(sizeof(size_t) > sizeof(unsigned long));
-	if (nfences > min_t(unsigned long,
-			    ULONG_MAX / sizeof(*user),
-			    SIZE_MAX / sizeof(*eb->fences)))
+	if (num_fences > min_t(unsigned long,
+			       ULONG_MAX / sizeof(*user),
+			       SIZE_MAX / sizeof(*f) - eb->num_fences))
 		return -EINVAL;
 
 	user = u64_to_user_ptr(args->cliprects_ptr);
-	if (!access_ok(user, nfences * sizeof(*user)))
+	if (!access_ok(user, num_fences * sizeof(*user)))
 		return -EFAULT;
 
-	fences = kvmalloc_array(nfences, sizeof(*fences),
-				__GFP_NOWARN | GFP_KERNEL);
-	if (!fences)
+	f = krealloc(eb->fences,
+		     (eb->num_fences + num_fences) * sizeof(*f),
+		     __GFP_NOWARN | GFP_KERNEL);
+	if (!f)
 		return -ENOMEM;
 
-	for (n = 0; n < nfences; n++) {
-		struct drm_i915_gem_exec_fence fence;
+	eb->fences = f;
+	f += eb->num_fences;
+	while (num_fences--) {
+		struct drm_i915_gem_exec_fence user_fence;
 		struct drm_syncobj *syncobj;
+		struct dma_fence *fence = NULL;
 
-		if (__copy_from_user(&fence, user++, sizeof(fence))) {
-			err = -EFAULT;
-			goto err;
-		}
+		if (__copy_from_user(&user_fence, user++, sizeof(user_fence)))
+			return -EFAULT;
 
-		if (fence.flags & __I915_EXEC_FENCE_UNKNOWN_FLAGS) {
-			err = -EINVAL;
-			goto err;
-		}
+		if (user_fence.flags & __I915_EXEC_FENCE_UNKNOWN_FLAGS)
+			return -EINVAL;
 
-		syncobj = drm_syncobj_find(eb->file, fence.handle);
+		syncobj = drm_syncobj_find(eb->file, user_fence.handle);
 		if (!syncobj) {
 			DRM_DEBUG("Invalid syncobj handle provided\n");
-			err = -ENOENT;
-			goto err;
+			return -ENOENT;
+		}
+
+		if (user_fence.flags & I915_EXEC_FENCE_WAIT) {
+			fence = drm_syncobj_fence_get(syncobj);
+			if (!fence) {
+				DRM_DEBUG("Syncobj handle has no fence\n");
+				drm_syncobj_put(syncobj);
+				return -EINVAL;
+			}
 		}
 
 		BUILD_BUG_ON(~(ARCH_KMALLOC_MINALIGN - 1) &
 			     ~__I915_EXEC_FENCE_UNKNOWN_FLAGS);
 
-		fences[n].syncobj = ptr_pack_bits(syncobj, fence.flags, 2);
-		fences[n].value = 0;
-		fences[n].chain_fence = NULL;
+		f->syncobj = ptr_pack_bits(syncobj, user_fence.flags, 2);
+		f->dma_fence = fence;
+		f->value = 0;
+		f->chain_fence = NULL;
+		f++;
+		eb->num_fences++;
 	}
 
-	eb->fences = fences;
-	eb->n_fences = nfences;
-
 	return 0;
+}
 
-err:
-	__free_fence_array(fences, n);
-	return err;
+static void put_fence_array(struct eb_fence *fences, int num_fences)
+{
+	if (fences)
+		__free_fence_array(fences, num_fences);
 }
 
 static int
@@ -2388,30 +2425,17 @@ await_fence_array(struct i915_execbuffer *eb)
 	unsigned int n;
 	int err;
 
-	for (n = 0; n < eb->n_fences; n++) {
+	for (n = 0; n < eb->num_fences; n++) {
 		struct drm_syncobj *syncobj;
-		struct dma_fence *fence;
 		unsigned int flags;
 
 		syncobj = ptr_unpack_bits(eb->fences[n].syncobj, &flags, 2);
-		if (!(flags & I915_EXEC_FENCE_WAIT))
-			continue;
 
-		fence = drm_syncobj_fence_get(syncobj);
-		if (!fence)
-			return -EINVAL;
-
-		if (eb->fences[n].value) {
-			err = dma_fence_chain_find_seqno(&fence, eb->fences[n].value);
-			if (err)
-				return err;
-
-			if (!fence)
-				continue;
-		}
+		if (!eb->fences[n].dma_fence)
+			continue;
 
-		err = i915_request_await_dma_fence(eb->request, fence);
-		dma_fence_put(fence);
+		err = i915_request_await_dma_fence(eb->request,
+						   eb->fences[n].dma_fence);
 		if (err < 0)
 			return err;
 	}
@@ -2419,13 +2443,12 @@ await_fence_array(struct i915_execbuffer *eb)
 	return 0;
 }
 
-static void
-signal_fence_array(struct i915_execbuffer *eb)
+static void signal_fence_array(const struct i915_execbuffer *eb)
 {
 	struct dma_fence * const fence = &eb->request->fence;
 	unsigned int n;
 
-	for (n = 0; n < eb->n_fences; n++) {
+	for (n = 0; n < eb->num_fences; n++) {
 		struct drm_syncobj *syncobj;
 		unsigned int flags;
 
@@ -2434,8 +2457,10 @@ signal_fence_array(struct i915_execbuffer *eb)
 			continue;
 
 		if (eb->fences[n].chain_fence) {
-			drm_syncobj_add_point(syncobj, eb->fences[n].chain_fence,
-					      fence, eb->fences[n].value);
+			drm_syncobj_add_point(syncobj,
+					      eb->fences[n].chain_fence,
+					      fence,
+					      eb->fences[n].value);
 			/*
 			 * The chain's ownership is transferred to the
 			 * timeline.
@@ -2447,6 +2472,18 @@ signal_fence_array(struct i915_execbuffer *eb)
 	}
 }
 
+static int
+parse_timeline_fences(struct i915_user_extension __user *ext, void *data)
+{
+	struct i915_execbuffer *eb = data;
+	struct drm_i915_gem_execbuffer_ext_timeline_fences timeline_fences;
+
+	if (copy_from_user(&timeline_fences, ext, sizeof(timeline_fences)))
+		return -EFAULT;
+
+	return add_timeline_fence_array(eb, &timeline_fences);
+}
+
 static void retire_requests(struct intel_timeline *tl, struct i915_request *end)
 {
 	struct i915_request *rq, *rn;
@@ -2488,30 +2525,6 @@ static void eb_request_add(struct i915_execbuffer *eb)
 	mutex_unlock(&tl->mutex);
 }
 
-static int parse_timeline_fences(struct i915_user_extension __user *ext, void *data)
-{
-	struct drm_i915_gem_execbuffer_ext_timeline_fences timeline_fences;
-	struct i915_execbuffer *eb = data;
-
-	/* Timeline fences are incompatible with the fence array flag. */
-	if (eb->args->flags & I915_EXEC_FENCE_ARRAY)
-		return -EINVAL;
-
-	/*
-	 * Prevent the drm_i915_gem_execbuffer_ext_timeline_fences structure
-	 * to be included multiple times.
-	 */
-	if (eb->extension_flags & BIT_ULL(DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES))
-		return -EINVAL;
-
-	if (copy_from_user(&timeline_fences, ext, sizeof(timeline_fences)))
-		return -EFAULT;
-
-	eb->extension_flags |= BIT_ULL(DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES);
-
-	return get_timeline_fence_array(&timeline_fences, eb);
-}
-
 static const i915_user_extension_fn execbuf_extensions[] = {
 	[DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES] = parse_timeline_fences,
 };
@@ -2520,8 +2533,6 @@ static int
 parse_execbuf2_extensions(struct drm_i915_gem_execbuffer2 *args,
 			  struct i915_execbuffer *eb)
 {
-	eb->extension_flags = 0;
-
 	if (!(args->flags & I915_EXEC_USE_EXTENSIONS))
 		return 0;
 
@@ -2575,7 +2586,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 	eb.trampoline = NULL;
 
 	eb.fences = NULL;
-	eb.n_fences = 0;
+	eb.num_fences = 0;
 
 	eb.batch_flags = 0;
 	if (args->flags & I915_EXEC_SECURE) {
@@ -2594,14 +2605,24 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 	if (args->flags & I915_EXEC_IS_PINNED)
 		eb.batch_flags |= I915_DISPATCH_PINNED;
 
+	err = parse_execbuf2_extensions(args, &eb);
+	if (err)
+		goto err_ext;
+
+	err = add_fence_array(&eb);
+	if (err)
+		goto err_ext;
+
 #define IN_FENCES (I915_EXEC_FENCE_IN | I915_EXEC_FENCE_SUBMIT)
 	if (args->flags & IN_FENCES) {
 		if ((args->flags & IN_FENCES) == IN_FENCES)
 			return -EINVAL;
 
 		in_fence = sync_file_get_fence(lower_32_bits(args->rsvd2));
-		if (!in_fence)
-			return -EINVAL;
+		if (!in_fence) {
+			err = -EINVAL;
+			goto err_ext;
+		}
 	}
 #undef IN_FENCES
 
@@ -2613,17 +2634,9 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 		}
 	}
 
-	err = parse_execbuf2_extensions(args, &eb);
-	if (err)
-		goto err_out_fence;
-
-	err = get_legacy_fence_array(args, &eb);
-	if (err)
-		goto err_arr_fence;
-
 	err = eb_create(&eb);
 	if (err)
-		goto err_arr_fence;
+		goto err_out_fence;
 
 	GEM_BUG_ON(!eb.lut_size);
 
@@ -2719,7 +2732,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 			goto err_request;
 	}
 
-	if (eb.n_fences) {
+	if (eb.fences) {
 		err = await_fence_array(&eb);
 		if (err)
 			goto err_request;
@@ -2750,7 +2763,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 	i915_request_get(eb.request);
 	eb_request_add(&eb);
 
-	if (eb.n_fences)
+	if (eb.fences)
 		signal_fence_array(&eb);
 
 	if (out_fence) {
@@ -2779,13 +2792,13 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 	i915_gem_context_put(eb.gem_context);
 err_destroy:
 	eb_destroy(&eb);
-err_arr_fence:
-	__free_fence_array(eb.fences, eb.n_fences);
 err_out_fence:
 	if (out_fence_fd != -1)
 		put_unused_fd(out_fence_fd);
 err_in_fence:
 	dma_fence_put(in_fence);
+err_ext:
+	put_fence_array(eb.fences, eb.num_fences);
 	return err;
 }
 
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 021276c39842..e6cbd22308aa 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -620,12 +620,11 @@ typedef struct drm_i915_irq_wait {
 #define I915_PARAM_PERF_REVISION	54
 
 /* Query whether DRM_I915_GEM_EXECBUFFER2 supports supplying an array of
- * timeline syncobj through drm_i915_gem_execbuf_ext_timeline_fences. See
+ * timeline syncobj through drm_i915_gem_execbuffer_ext_timeline_fences. See
  * I915_EXEC_USE_EXTENSIONS.
  */
 #define I915_PARAM_HAS_EXEC_TIMELINE_FENCES 55
 
-
 /* Must be kept compact -- no holes and well documented */
 
 typedef struct drm_i915_getparam {
@@ -1053,14 +1052,10 @@ struct drm_i915_gem_exec_fence {
 	__u32 flags;
 };
 
-enum drm_i915_gem_execbuffer_ext {
-	/**
-	 * See drm_i915_gem_execbuf_ext_timeline_fences.
-	 */
-	DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES = 1,
-
-	DRM_I915_GEM_EXECBUFFER_EXT_MAX /* non-ABI */
-};
+/**
+ * See drm_i915_gem_execbuffer_ext_timeline_fences.
+ */
+#define DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES 0
 
 /**
  * This structure describes an array of drm_syncobj and associated points for
-- 
2.20.1

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Re: [Intel-gfx] [PATCH] drm/i915: add syncobj timeline support

[Lionel Landwerlin]

On 03/08/2020 17:23, Chris Wilson wrote:
> -enum drm_i915_gem_execbuffer_ext {
> -	/**
> -	 * See drm_i915_gem_execbuf_ext_timeline_fences.
> -	 */
> -	DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES = 1,
> -
> -	DRM_I915_GEM_EXECBUFFER_EXT_MAX /* non-ABI */
> -};
> +/**
> + * See drm_i915_gem_execbuffer_ext_timeline_fences.
> + */
> +#define DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES 0
>   

I was made to switch this from 0 to 1 just to make sure it's not a 
inadvertently left to 0.

I can't remember if it was Jason or Daniel's suggestion.


-Lionel

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[Intel-gfx] [PATCH 3/3] drm/i915: peel dma-fence-chains wait fences

[Lionel Landwerlin]

To allow faster engine to engine synchronization, peel the layer of
dma-fence-chain to expose potential i915 fences so that the
i915-request code can emit HW semaphore wait/signal operations in the
ring which is faster than waking up the host to submit unblocked
workloads after interrupt notification.

v2: Also deal with chains where the last node is not a dma-fence-chain

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    | 39 ++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 1f766431f3a3..dbd7f03c2187 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -2390,6 +2390,7 @@ await_fence_array(struct i915_execbuffer *eb)
 
 	for (n = 0; n < eb->n_fences; n++) {
 		struct drm_syncobj *syncobj;
+		struct dma_fence_chain *chain;
 		struct dma_fence *fence;
 		unsigned int flags;
 
@@ -2410,7 +2411,43 @@ await_fence_array(struct i915_execbuffer *eb)
 				continue;
 		}
 
-		err = i915_request_await_dma_fence(eb->request, fence);
+		chain = to_dma_fence_chain(fence);
+		if (chain) {
+			struct dma_fence *iter;
+
+			/*
+			 * If we're dealing with a dma-fence-chain, peel the
+			 * chain by adding all of the unsignaled fences
+			 * (dma_fence_chain_for_each does that for us) the
+			 * chain points to.
+			 *
+			 * This enables us to identify waits on i915 fences
+			 * and allows for faster engine-to-engine
+			 * synchronization using HW semaphores.
+			 */
+			dma_fence_chain_for_each(iter, fence) {
+				struct dma_fence_chain *iter_chain =
+					to_dma_fence_chain(iter);
+
+				/*
+				 * It is possible that the last item in the
+				 * chain is not a dma_fence_chain.
+				 */
+				if (iter_chain) {
+					err = i915_request_await_dma_fence(eb->request,
+									   iter_chain->fence);
+				} else {
+					err = i915_request_await_dma_fence(eb->request, iter);
+				}
+				if (err < 0) {
+					dma_fence_put(iter);
+					break;
+				}
+			}
+		} else {
+			err = i915_request_await_dma_fence(eb->request, fence);
+		}
+
 		dma_fence_put(fence);
 		if (err < 0)
 			return err;
-- 
2.28.0

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Re: [Intel-gfx] [PATCH 3/3] drm/i915: peel dma-fence-chains wait fences

[Chris Wilson]

Quoting Lionel Landwerlin (2020-08-03 15:01:47)
> To allow faster engine to engine synchronization, peel the layer of
> dma-fence-chain to expose potential i915 fences so that the
> i915-request code can emit HW semaphore wait/signal operations in the
> ring which is faster than waking up the host to submit unblocked
> workloads after interrupt notification.
> 
> v2: Also deal with chains where the last node is not a dma-fence-chain

This is already done by i915_request_await_dma_fence.
-Chris
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Re: [Intel-gfx] [PATCH 3/3] drm/i915: peel dma-fence-chains wait fences

[Lionel Landwerlin]

On 03/08/2020 17:08, Chris Wilson wrote:
> Quoting Lionel Landwerlin (2020-08-03 15:01:47)
>> To allow faster engine to engine synchronization, peel the layer of
>> dma-fence-chain to expose potential i915 fences so that the
>> i915-request code can emit HW semaphore wait/signal operations in the
>> ring which is faster than waking up the host to submit unblocked
>> workloads after interrupt notification.
>>
>> v2: Also deal with chains where the last node is not a dma-fence-chain
> This is already done by i915_request_await_dma_fence.
> -Chris
Cool, we can drop this then.

-Lionel
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[Intel-gfx] ✗ Fi.CI.BUILD: failure for drm/i915: timeline semaphore support (rev2)

[Patchwork]

== Series Details ==

Series: drm/i915: timeline semaphore support (rev2)
URL   : https://patchwork.freedesktop.org/series/80214/
State : failure

== Summary ==

Applying: drm/i915: introduce a mechanism to extend execbuf2
Applying: drm/i915: add syncobj timeline support
Using index info to reconstruct a base tree...
M	drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
M	include/uapi/drm/i915_drm.h
Falling back to patching base and 3-way merge...
Auto-merging include/uapi/drm/i915_drm.h
CONFLICT (content): Merge conflict in include/uapi/drm/i915_drm.h
Auto-merging drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
CONFLICT (content): Merge conflict in drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0002 drm/i915: add syncobj timeline support
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".


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