[Intel-gfx] [RFC 03/10] drm/i915/vm_bind: Support private and shared BOs
Niranjana Vishwanathapura
niranjana.vishwanathapura at intel.com
Fri Jul 1 22:50:48 UTC 2022
Add uapi allowing user to specify a BO as private to a specified VM
during the BO creation.
VM private BOs can only be mapped on the specified VM and can't be
dma_buf exported. VM private BOs share a single common dma_resv object,
hence has a performance advantage requiring a single dma_resv object
update in the execbuf path compared to non-private (shared) BOs.
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura at intel.com>
---
drivers/gpu/drm/i915/gem/i915_gem_create.c | 41 ++++++++++++++++++-
drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 6 +++
.../gpu/drm/i915/gem/i915_gem_object_types.h | 3 ++
drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 3 ++
drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h | 11 +++++
.../drm/i915/gem/i915_gem_vm_bind_object.c | 9 ++++
drivers/gpu/drm/i915/gt/intel_gtt.c | 4 ++
drivers/gpu/drm/i915/gt/intel_gtt.h | 2 +
drivers/gpu/drm/i915/i915_vma.c | 1 +
drivers/gpu/drm/i915/i915_vma_types.h | 2 +
include/uapi/drm/i915_drm.h | 30 ++++++++++++++
11 files changed, 110 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_create.c b/drivers/gpu/drm/i915/gem/i915_gem_create.c
index 927a87e5ec59..7e264566b51f 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_create.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_create.c
@@ -11,6 +11,7 @@
#include "pxp/intel_pxp.h"
#include "i915_drv.h"
+#include "i915_gem_context.h"
#include "i915_gem_create.h"
#include "i915_trace.h"
#include "i915_user_extensions.h"
@@ -243,6 +244,7 @@ struct create_ext {
unsigned int n_placements;
unsigned int placement_mask;
unsigned long flags;
+ u32 vm_id;
};
static void repr_placements(char *buf, size_t size,
@@ -392,9 +394,24 @@ static int ext_set_protected(struct i915_user_extension __user *base, void *data
return 0;
}
+static int ext_set_vm_private(struct i915_user_extension __user *base,
+ void *data)
+{
+ struct drm_i915_gem_create_ext_vm_private ext;
+ struct create_ext *ext_data = data;
+
+ if (copy_from_user(&ext, base, sizeof(ext)))
+ return -EFAULT;
+
+ ext_data->vm_id = ext.vm_id;
+
+ return 0;
+}
+
static const i915_user_extension_fn create_extensions[] = {
[I915_GEM_CREATE_EXT_MEMORY_REGIONS] = ext_set_placements,
[I915_GEM_CREATE_EXT_PROTECTED_CONTENT] = ext_set_protected,
+ [I915_GEM_CREATE_EXT_VM_PRIVATE] = ext_set_vm_private,
};
/**
@@ -410,6 +427,7 @@ i915_gem_create_ext_ioctl(struct drm_device *dev, void *data,
struct drm_i915_private *i915 = to_i915(dev);
struct drm_i915_gem_create_ext *args = data;
struct create_ext ext_data = { .i915 = i915 };
+ struct i915_address_space *vm = NULL;
struct drm_i915_gem_object *obj;
int ret;
@@ -423,6 +441,12 @@ i915_gem_create_ext_ioctl(struct drm_device *dev, void *data,
if (ret)
return ret;
+ if (ext_data.vm_id) {
+ vm = i915_gem_vm_lookup(file->driver_priv, ext_data.vm_id);
+ if (unlikely(!vm))
+ return -ENOENT;
+ }
+
if (!ext_data.n_placements) {
ext_data.placements[0] =
intel_memory_region_by_type(i915, INTEL_MEMORY_SYSTEM);
@@ -449,8 +473,21 @@ i915_gem_create_ext_ioctl(struct drm_device *dev, void *data,
ext_data.placements,
ext_data.n_placements,
ext_data.flags);
- if (IS_ERR(obj))
- return PTR_ERR(obj);
+ if (IS_ERR(obj)) {
+ ret = PTR_ERR(obj);
+ goto vm_put;
+ }
+
+ if (vm) {
+ obj->base.resv = vm->root_obj->base.resv;
+ obj->priv_root = i915_gem_object_get(vm->root_obj);
+ i915_vm_put(vm);
+ }
return i915_gem_publish(obj, file, &args->size, &args->handle);
+vm_put:
+ if (vm)
+ i915_vm_put(vm);
+
+ return ret;
}
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
index f5062d0c6333..6433173c3e84 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
@@ -218,6 +218,12 @@ struct dma_buf *i915_gem_prime_export(struct drm_gem_object *gem_obj, int flags)
struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
+ if (obj->priv_root) {
+ drm_dbg(obj->base.dev,
+ "Exporting VM private objects is not allowed\n");
+ return ERR_PTR(-EINVAL);
+ }
+
exp_info.ops = &i915_dmabuf_ops;
exp_info.size = gem_obj->size;
exp_info.flags = flags;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
index 5cf36a130061..9fe3395ad4d9 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
@@ -241,6 +241,9 @@ struct drm_i915_gem_object {
const struct drm_i915_gem_object_ops *ops;
+ /* Shared root is object private to a VM; NULL otherwise */
+ struct drm_i915_gem_object *priv_root;
+
struct {
/**
* @vma.lock: protect the list/tree of vmas
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index 7e1f8b83077f..f1912b12db00 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -1152,6 +1152,9 @@ void i915_ttm_bo_destroy(struct ttm_buffer_object *bo)
i915_gem_object_release_memory_region(obj);
mutex_destroy(&obj->ttm.get_io_page.lock);
+ if (obj->priv_root)
+ i915_gem_object_put(obj->priv_root);
+
if (obj->ttm.created) {
/*
* We freely manage the shrinker LRU outide of the mm.pages life
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h
index 642cdb559f17..ee6e4c52e80e 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h
@@ -26,6 +26,17 @@ static inline void i915_gem_vm_bind_unlock(struct i915_address_space *vm)
mutex_unlock(&vm->vm_bind_lock);
}
+static inline int i915_gem_vm_priv_lock(struct i915_address_space *vm,
+ struct i915_gem_ww_ctx *ww)
+{
+ return i915_gem_object_lock(vm->root_obj, ww);
+}
+
+static inline void i915_gem_vm_priv_unlock(struct i915_address_space *vm)
+{
+ i915_gem_object_unlock(vm->root_obj);
+}
+
struct i915_vma *
i915_gem_vm_bind_lookup_vma(struct i915_address_space *vm, u64 va);
void i915_gem_vm_bind_remove(struct i915_vma *vma, bool release_obj);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
index 43ceb4dcca6c..3201204c8e74 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
@@ -85,6 +85,7 @@ void i915_gem_vm_bind_remove(struct i915_vma *vma, bool release_obj)
if (!list_empty(&vma->vm_bind_link)) {
list_del_init(&vma->vm_bind_link);
+ list_del_init(&vma->non_priv_vm_bind_link);
i915_vm_bind_it_remove(vma, &vma->vm->va);
/* Release object */
@@ -185,6 +186,11 @@ int i915_gem_vm_bind_obj(struct i915_address_space *vm,
goto put_obj;
}
+ if (obj->priv_root && obj->priv_root != vm->root_obj) {
+ ret = -EINVAL;
+ goto put_obj;
+ }
+
ret = i915_gem_vm_bind_lock_interruptible(vm);
if (ret)
goto put_obj;
@@ -211,6 +217,9 @@ int i915_gem_vm_bind_obj(struct i915_address_space *vm,
list_add_tail(&vma->vm_bind_link, &vm->vm_bound_list);
i915_vm_bind_it_insert(vma, &vm->va);
+ if (!obj->priv_root)
+ list_add_tail(&vma->non_priv_vm_bind_link,
+ &vm->non_priv_vm_bind_list);
/* Hold object reference until vm_unbind */
i915_gem_object_get(vma->obj);
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c
index 135dc4a76724..df0a8459c3c6 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.c
@@ -176,6 +176,7 @@ int i915_vm_lock_objects(struct i915_address_space *vm,
void i915_address_space_fini(struct i915_address_space *vm)
{
drm_mm_takedown(&vm->mm);
+ i915_gem_object_put(vm->root_obj);
GEM_BUG_ON(!RB_EMPTY_ROOT(&vm->va.rb_root));
mutex_destroy(&vm->vm_bind_lock);
}
@@ -289,6 +290,9 @@ void i915_address_space_init(struct i915_address_space *vm, int subclass)
INIT_LIST_HEAD(&vm->vm_bind_list);
INIT_LIST_HEAD(&vm->vm_bound_list);
mutex_init(&vm->vm_bind_lock);
+ INIT_LIST_HEAD(&vm->non_priv_vm_bind_list);
+ vm->root_obj = i915_gem_object_create_internal(vm->i915, PAGE_SIZE);
+ GEM_BUG_ON(IS_ERR(vm->root_obj));
}
void *__px_vaddr(struct drm_i915_gem_object *p)
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
index d4a6ce65251d..f538ce9115c9 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -267,6 +267,8 @@ struct i915_address_space {
struct list_head vm_bound_list;
/* va tree of persistent vmas */
struct rb_root_cached va;
+ struct list_head non_priv_vm_bind_list;
+ struct drm_i915_gem_object *root_obj;
/* Global GTT */
bool is_ggtt:1;
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index d324e29cef0a..f0226581d342 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -236,6 +236,7 @@ vma_create(struct drm_i915_gem_object *obj,
mutex_unlock(&vm->mutex);
INIT_LIST_HEAD(&vma->vm_bind_link);
+ INIT_LIST_HEAD(&vma->non_priv_vm_bind_link);
return vma;
err_unlock:
diff --git a/drivers/gpu/drm/i915/i915_vma_types.h b/drivers/gpu/drm/i915/i915_vma_types.h
index b6d179bdbfa0..2298b3d6b7c4 100644
--- a/drivers/gpu/drm/i915/i915_vma_types.h
+++ b/drivers/gpu/drm/i915/i915_vma_types.h
@@ -290,6 +290,8 @@ struct i915_vma {
struct list_head vm_link;
struct list_head vm_bind_link; /* Link in persistent VMA list */
+ /* Link in non-private persistent VMA list */
+ struct list_head non_priv_vm_bind_link;
/** Interval tree structures for persistent vma */
struct rb_node rb;
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 26cca49717f8..ce1c6592b0d7 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -3542,9 +3542,13 @@ struct drm_i915_gem_create_ext {
*
* For I915_GEM_CREATE_EXT_PROTECTED_CONTENT usage see
* struct drm_i915_gem_create_ext_protected_content.
+ *
+ * For I915_GEM_CREATE_EXT_VM_PRIVATE usage see
+ * struct drm_i915_gem_create_ext_vm_private.
*/
#define I915_GEM_CREATE_EXT_MEMORY_REGIONS 0
#define I915_GEM_CREATE_EXT_PROTECTED_CONTENT 1
+#define I915_GEM_CREATE_EXT_VM_PRIVATE 2
__u64 extensions;
};
@@ -3662,6 +3666,32 @@ struct drm_i915_gem_create_ext_protected_content {
/* ID of the protected content session managed by i915 when PXP is active */
#define I915_PROTECTED_CONTENT_DEFAULT_SESSION 0xf
+/**
+ * struct drm_i915_gem_create_ext_vm_private - Extension to make the object
+ * private to the specified VM.
+ *
+ * See struct drm_i915_gem_create_ext.
+ *
+ * By default, BOs can be mapped on multiple VMs and can also be dma-buf
+ * exported. Hence these BOs are referred to as Shared BOs.
+ * During each execbuf3 submission, the request fence must be added to the
+ * dma-resv fence list of all shared BOs mapped on the VM.
+ *
+ * Unlike Shared BOs, these VM private BOs can only be mapped on the VM they
+ * are private to and can't be dma-buf exported. All private BOs of a VM share
+ * the dma-resv object. Hence during each execbuf3 submission, they need only
+ * one dma-resv fence list updated. Thus, the fast path (where required
+ * mappings are already bound) submission latency is O(1) w.r.t the number of
+ * VM private BOs.
+ */
+struct drm_i915_gem_create_ext_vm_private {
+ /** @base: Extension link. See struct i915_user_extension. */
+ struct i915_user_extension base;
+
+ /** @vm_id: Id of the VM to which the object is private */
+ __u32 vm_id;
+};
+
/**
* struct drm_i915_gem_vm_bind - VA to object mapping to bind.
*
--
2.21.0.rc0.32.g243a4c7e27
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