Bind and unbind the mappings upon VM_BIND and VM_UNBIND calls.
Signed-off-by: Niranjana Vishwanathapura
<niranjana.vishwanathapura@xxxxxxxxx>
Signed-off-by: Prathap Kumar Valsan <prathap.kumar.valsan@xxxxxxxxx>
---
drivers/gpu/drm/i915/Makefile | 1 +
drivers/gpu/drm/i915/gem/i915_gem_create.c | 10 +-
drivers/gpu/drm/i915/gem/i915_gem_object.h | 2 +
drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h | 38 +++
.../drm/i915/gem/i915_gem_vm_bind_object.c | 233 ++++++++++++++++++
drivers/gpu/drm/i915/gt/intel_gtt.c | 7 +
drivers/gpu/drm/i915/gt/intel_gtt.h | 9 +
drivers/gpu/drm/i915/i915_driver.c | 11 +-
drivers/gpu/drm/i915/i915_vma.c | 7 +-
drivers/gpu/drm/i915/i915_vma.h | 2 -
drivers/gpu/drm/i915/i915_vma_types.h | 8 +
11 files changed, 318 insertions(+), 10 deletions(-)
create mode 100644 drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h
create mode 100644 drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
diff --git a/drivers/gpu/drm/i915/Makefile
b/drivers/gpu/drm/i915/Makefile
index 522ef9b4aff3..4e1627e96c6e 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -165,6 +165,7 @@ gem-y += \
gem/i915_gem_ttm_move.o \
gem/i915_gem_ttm_pm.o \
gem/i915_gem_userptr.o \
+ gem/i915_gem_vm_bind_object.o \
gem/i915_gem_wait.o \
gem/i915_gemfs.o
i915-y += \
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_create.c
b/drivers/gpu/drm/i915/gem/i915_gem_create.c
index 33673fe7ee0a..927a87e5ec59 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_create.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_create.c
@@ -15,10 +15,10 @@
#include "i915_trace.h"
#include "i915_user_extensions.h"
-static u32 object_max_page_size(struct intel_memory_region
**placements,
- unsigned int n_placements)
+u32 i915_gem_object_max_page_size(struct intel_memory_region
**placements,
+ unsigned int n_placements)
{
- u32 max_page_size = 0;
+ u32 max_page_size = I915_GTT_PAGE_SIZE_4K;
int i;
for (i = 0; i < n_placements; i++) {
@@ -28,7 +28,6 @@ static u32 object_max_page_size(struct
intel_memory_region **placements,
max_page_size = max_t(u32, max_page_size, mr->min_page_size);
}
- GEM_BUG_ON(!max_page_size);
return max_page_size;
}
@@ -99,7 +98,8 @@ __i915_gem_object_create_user_ext(struct
drm_i915_private *i915, u64 size,
i915_gem_flush_free_objects(i915);
- size = round_up(size, object_max_page_size(placements,
n_placements));
+ size = round_up(size, i915_gem_object_max_page_size(placements,
+ n_placements));
if (size == 0)
return ERR_PTR(-EINVAL);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h
b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index 6f0a3ce35567..650de2224843 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -47,6 +47,8 @@ static inline bool i915_gem_object_size_2big(u64 size)
}
void i915_gem_init__objects(struct drm_i915_private *i915);
+u32 i915_gem_object_max_page_size(struct intel_memory_region
**placements,
+ unsigned int n_placements);
void i915_objects_module_exit(void);
int i915_objects_module_init(void);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h
b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h
new file mode 100644
index 000000000000..642cdb559f17
--- /dev/null
+++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#ifndef __I915_GEM_VM_BIND_H
+#define __I915_GEM_VM_BIND_H
+
+#include "i915_drv.h"
+
+#define assert_vm_bind_held(vm)
lockdep_assert_held(&(vm)->vm_bind_lock)
+
+static inline void i915_gem_vm_bind_lock(struct i915_address_space *vm)
+{
+ mutex_lock(&vm->vm_bind_lock);
+}
+
+static inline int
+i915_gem_vm_bind_lock_interruptible(struct i915_address_space *vm)
+{
+ return mutex_lock_interruptible(&vm->vm_bind_lock);
+}
+
+static inline void i915_gem_vm_bind_unlock(struct i915_address_space
*vm)
+{
+ mutex_unlock(&vm->vm_bind_lock);
+}
+
+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);
+int i915_gem_vm_bind_obj(struct i915_address_space *vm,
+ struct drm_i915_gem_vm_bind *va,
+ struct drm_file *file);
+int i915_gem_vm_unbind_obj(struct i915_address_space *vm,
+ struct drm_i915_gem_vm_unbind *va);
+
+#endif /* __I915_GEM_VM_BIND_H */
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
new file mode 100644
index 000000000000..43ceb4dcca6c
--- /dev/null
+++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
@@ -0,0 +1,233 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include <linux/interval_tree_generic.h>
+
+#include "gem/i915_gem_vm_bind.h"
+#include "gt/gen8_engine_cs.h"
+
+#include "i915_drv.h"
+#include "i915_gem_gtt.h"
+
+#define START(node) ((node)->start)
+#define LAST(node) ((node)->last)
+
+INTERVAL_TREE_DEFINE(struct i915_vma, rb, u64, __subtree_last,
+ START, LAST, static inline, i915_vm_bind_it)
+
+#undef START
+#undef LAST
+
+/**
+ * DOC: VM_BIND/UNBIND ioctls
+ *
+ * DRM_I915_GEM_VM_BIND/UNBIND ioctls allows UMD to bind/unbind GEM
buffer
+ * objects (BOs) or sections of a BOs at specified GPU virtual
addresses on a
+ * specified address space (VM). Multiple mappings can map to the
same physical
+ * pages of an object (aliasing). These mappings (also referred to
as persistent
+ * mappings) will be persistent across multiple GPU submissions
(execbuf calls)
+ * issued by the UMD, without user having to provide a list of all
required
+ * mappings during each submission (as required by older execbuf mode).
+ *
+ * The VM_BIND/UNBIND calls allow UMDs to request a timeline out
fence for
+ * signaling the completion of bind/unbind operation.
+ *
+ * VM_BIND feature is advertised to user via
I915_PARAM_VM_BIND_VERSION.
+ * User has to opt-in for VM_BIND mode of binding for an address
space (VM)
+ * during VM creation time via I915_VM_CREATE_FLAGS_USE_VM_BIND
extension.
+ *
+ * VM_BIND/UNBIND ioctl calls executed on different CPU threads
concurrently
+ * are not ordered. Furthermore, parts of the VM_BIND/UNBIND
operations can be
+ * done asynchronously, when valid out fence is specified.
+ *
+ * VM_BIND locking order is as below.
+ *
+ * 1) Lock-A: A vm_bind mutex will protect vm_bind lists. This lock
is taken in
+ * vm_bind/vm_unbind ioctl calls, in the execbuf path and while
releasing the
+ * mapping.
+ *
+ * In future, when GPU page faults are supported, we can
potentially use a
+ * rwsem instead, so that multiple page fault handlers can take
the read
+ * side lock to lookup the mapping and hence can run in parallel.
+ * The older execbuf mode of binding do not need this lock.
+ *
+ * 2) Lock-B: The object's dma-resv lock will protect i915_vma state
and needs
+ * to be held while binding/unbinding a vma in the async worker
and while
+ * updating dma-resv fence list of an object. Note that private
BOs of a VM
+ * will all share a dma-resv object.
+ *
+ * The future system allocator support will use the HMM
prescribed locking
+ * instead.
+ *
+ * 3) Lock-C: Spinlock/s to protect some of the VM's lists like the
list of
+ * invalidated vmas (due to eviction and userptr invalidation) etc.
+ */
+
+struct i915_vma *
+i915_gem_vm_bind_lookup_vma(struct i915_address_space *vm, u64 va)
+{
+ struct i915_vma *vma, *temp;
+
+ assert_vm_bind_held(vm);
+
+ vma = i915_vm_bind_it_iter_first(&vm->va, va, va);
+ /* Working around compiler error, remove later */
+ if (vma)
+ temp = i915_vm_bind_it_iter_next(vma, va + vma->size, -1);
+ return vma;
+}
+
+void i915_gem_vm_bind_remove(struct i915_vma *vma, bool release_obj)
+{
+ assert_vm_bind_held(vma->vm);
+
+ if (!list_empty(&vma->vm_bind_link)) {
+ list_del_init(&vma->vm_bind_link);
+ i915_vm_bind_it_remove(vma, &vma->vm->va);
+
+ /* Release object */
+ if (release_obj)
+ i915_vma_put(vma);
+ }
+}
+
+int i915_gem_vm_unbind_obj(struct i915_address_space *vm,
+ struct drm_i915_gem_vm_unbind *va)
+{
+ struct drm_i915_gem_object *obj;
+ struct i915_vma *vma;
+ int ret;
+
+ va->start = gen8_noncanonical_addr(va->start);
+ ret = i915_gem_vm_bind_lock_interruptible(vm);
+ if (ret)
+ return ret;
+
+ vma = i915_gem_vm_bind_lookup_vma(vm, va->start);
+ if (!vma) {
+ ret = -ENOENT;
+ goto out_unlock;
+ }
+
+ if (vma->size != va->length)
+ ret = -EINVAL;
+ else
+ i915_gem_vm_bind_remove(vma, false);
+
+out_unlock:
+ i915_gem_vm_bind_unlock(vm);
+ if (ret || !vma)
+ return ret;
+
+ /* Destroy vma and then release object */
+ obj = vma->obj;
+ ret = i915_gem_object_lock(obj, NULL);
+ if (ret)
+ return ret;
+
+ i915_vma_destroy(vma);
+ i915_gem_object_unlock(obj);
+ i915_gem_object_put(obj);
+
+ return 0;
+}
+
+static struct i915_vma *vm_bind_get_vma(struct i915_address_space *vm,
+ struct drm_i915_gem_object *obj,
+ struct drm_i915_gem_vm_bind *va)
+{
+ struct i915_ggtt_view view;
+ struct i915_vma *vma;
+
+ va->start = gen8_noncanonical_addr(va->start);
+ vma = i915_gem_vm_bind_lookup_vma(vm, va->start);
+ if (vma)
+ return ERR_PTR(-EEXIST);
+
+ view.type = I915_GGTT_VIEW_PARTIAL;
