Add uapi and implement support for bind and unbind of an
object at the specified GPU virtual addresses.
The vm_bind mode is not supported in legacy execbuf2 ioctl.
It will be supported only in the newer execbuf3 ioctl.
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@xxxxxxxxx>
Signed-off-by: Prathap Kumar Valsan <prathap.kumar.valsan@xxxxxxxxx>
Signed-off-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/Makefile | 1 +
.../gpu/drm/i915/gem/i915_gem_execbuffer.c | 5 +
drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h | 26 ++
.../drm/i915/gem/i915_gem_vm_bind_object.c | 306 ++++++++++++++++++
drivers/gpu/drm/i915/gt/intel_gtt.c | 10 +
drivers/gpu/drm/i915/gt/intel_gtt.h | 17 +
drivers/gpu/drm/i915/i915_driver.c | 3 +
drivers/gpu/drm/i915/i915_vma.c | 1 +
drivers/gpu/drm/i915/i915_vma_types.h | 14 +
include/uapi/drm/i915_drm.h | 112 +++++++
10 files changed, 495 insertions(+)
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 a26edcdadc21..9bf939ef18ea 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -166,6 +166,7 @@ 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_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index cd75b0ca2555..f85f10cf9c34 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -781,6 +781,11 @@ static int eb_select_context(struct i915_execbuffer *eb)
if (unlikely(IS_ERR(ctx)))
return PTR_ERR(ctx);
+ if (ctx->vm->vm_bind_mode) {
+ i915_gem_context_put(ctx);
+ return -EOPNOTSUPP;
+ }
+
eb->gem_context = ctx;
if (i915_gem_context_has_full_ppgtt(ctx))
eb->invalid_flags |= EXEC_OBJECT_NEEDS_GTT;
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..36262a6357b5
--- /dev/null
+++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#ifndef __I915_GEM_VM_BIND_H
+#define __I915_GEM_VM_BIND_H
+
+#include <linux/types.h>
+
+struct drm_device;
+struct drm_file;
+struct i915_address_space;
+struct i915_vma;
+
+struct i915_vma *
+i915_gem_vm_bind_lookup_vma(struct i915_address_space *vm, u64 va);
+
+int i915_gem_vm_bind_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file);
+int i915_gem_vm_unbind_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file);
+
+void i915_gem_vm_unbind_all(struct i915_address_space *vm);
+
+#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..e529162abd2c
--- /dev/null
+++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
@@ -0,0 +1,306 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include <uapi/drm/i915_drm.h>
+
+#include <linux/interval_tree_generic.h>
+
+#include "gem/i915_gem_context.h"
+#include "gem/i915_gem_vm_bind.h"
+
+#include "gt/intel_gpu_commands.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) vm_bind_lock 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) 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.
+ *
+ * 3) Spinlock/s to protect some of the VM's lists like the list of
+ * invalidated vmas (due to eviction and userptr invalidation) etc.
+ */
+
+/**
+ * i915_gem_vm_bind_lookup_vma() - lookup for persistent vma mapped at a
+ * specified address
+ * @vm: virtual address space to look for persistent vma
+ * @va: starting address where vma is mapped
+ *
+ * Retrieves the persistent vma mapped address @va from the @vm's vma tree.
+ *
+ * Returns vma pointer on success, NULL on failure.
+ */
+struct i915_vma *
+i915_gem_vm_bind_lookup_vma(struct i915_address_space *vm, u64 va)
+{
+ lockdep_assert_held(&vm->vm_bind_lock);
+
+ return i915_vm_bind_it_iter_first(&vm->va, va, va);
+}
+
+static void i915_gem_vm_bind_remove(struct i915_vma *vma, bool release_obj)
+{
+ lockdep_assert_held(&vma->vm->vm_bind_lock);
+
+ list_del_init(&vma->vm_bind_link);
+ i915_vm_bind_it_remove(vma, &vma->vm->va);
+
+ /* Release object */
+ if (release_obj)
+ i915_gem_object_put(vma->obj);
+}
+
+static int i915_gem_vm_unbind_vma(struct i915_address_space *vm,
+ struct drm_i915_gem_vm_unbind *va)
+{
+ struct drm_i915_gem_object *obj;
+ struct i915_vma *vma;
+ int ret;
+
+ ret = mutex_lock_interruptible(&vm->vm_bind_lock);
+ if (ret)
+ return ret;
+
+ va->start = gen8_noncanonical_addr(va->start);
+ vma = i915_gem_vm_bind_lookup_vma(vm, va->start);
+
+ if (!vma)
+ ret = -ENOENT;
+ else if (vma->size != va->length)
+ ret = -EINVAL;
+
+ if (ret) {
+ mutex_unlock(&vm->vm_bind_lock);
+ return ret;
+ }
+
+ i915_gem_vm_bind_remove(vma, false);
+
+ mutex_unlock(&vm->vm_bind_lock);
+
+ /* 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;
+}
+
+/**
+ * i915_gem_vm_unbind_all() - unbind all persistent mappings from an
+ * address space
+ * @vm: Address spece to remove persistent mappings from
+ *
+ * Unbind all userspace requested vm_bind mappings from @vm.
+ */
+void i915_gem_vm_unbind_all(struct i915_address_space *vm)
+{
+ struct i915_vma *vma, *t;
+
+ mutex_lock(&vm->vm_bind_lock);
+ list_for_each_entry_safe(vma, t, &vm->vm_bind_list, vm_bind_link)
+ i915_gem_vm_bind_remove(vma, true);
+ list_for_each_entry_safe(vma, t, &vm->vm_bound_list, vm_bind_link)
+ i915_gem_vm_bind_remove(vma, true);
+ mutex_unlock(&vm->vm_bind_lock);
+}
+
+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_gtt_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_GTT_VIEW_PARTIAL;
+ view.partial.offset = va->offset >> PAGE_SHIFT;
+ view.partial.size = va->length >> PAGE_SHIFT;
+ vma = i915_vma_create_persistent(obj, vm, &view);
+ if (IS_ERR(vma))
+ return vma;
+
+ vma->start = va->start;
+ vma->last = va->start + va->length - 1;
+
+ return vma;
+}
+
+static int i915_gem_vm_bind_obj(struct i915_address_space *vm,
+ struct drm_i915_gem_vm_bind *va,
+ struct drm_file *file)
+{
+ struct drm_i915_gem_object *obj;
+ struct i915_vma *vma = NULL;
+ struct i915_gem_ww_ctx ww;
+ u64 pin_flags;
+ int ret = 0;
+
+ if (!vm->vm_bind_mode)
+ return -EOPNOTSUPP;
+
+ obj = i915_gem_object_lookup(file, va->handle);
+ if (!obj)
+ return -ENOENT;
+
+ if (!va->length ||
+ !IS_ALIGNED(va->offset | va->length,
+ i915_gem_object_max_page_size(obj->mm.placements,
+ obj->mm.n_placements)) ||
+ range_overflows_t(u64, va->offset, va->length, obj->base.size)) {
+ ret = -EINVAL;
+ goto put_obj;
+ }
+
+ ret = mutex_lock_interruptible(&vm->vm_bind_lock);
+ if (ret)
+ goto put_obj;
+
+ vma = vm_bind_get_vma(vm, obj, va);
+ if (IS_ERR(vma)) {
+ ret = PTR_ERR(vma);
+ goto unlock_vm;
+ }
+
+ pin_flags = va->start | PIN_OFFSET_FIXED | PIN_USER;
+
+ for_i915_gem_ww(&ww, ret, true) {
+ ret = i915_gem_object_lock(vma->obj, &ww);
+ if (ret)
+ continue;
+
+ ret = i915_vma_pin_ww(vma, &ww, 0, 0, pin_flags);
+ if (ret)
+ continue;
+
+ /* Make it evictable */
+ __i915_vma_unpin(vma);
+
+ list_add_tail(&vma->vm_bind_link, &vm->vm_bound_list);
+ i915_vm_bind_it_insert(vma, &vm->va);
+
+ /* Hold object reference until vm_unbind */
+ i915_gem_object_get(vma->obj);
+ }
+
+ if (ret)
+ i915_vma_destroy(vma);
+unlock_vm:
+ mutex_unlock(&vm->vm_bind_lock);
+put_obj:
+ i915_gem_object_put(obj);
+
+ return ret;
+}
+
+/**
+ * i915_gem_vm_bind_ioctl() - ioctl function for binding a section of object
+ * at a specified virtual address
+ * @dev: drm_device pointer
+ * @data: ioctl data structure
+ * @file: drm_file pointer
+ *
+ * Adds the specified persistent mapping (virtual address to a section of an
+ * object) and binds it in the device page table.
+ *
+ * Returns 0 on success, error code on failure.
+ */
+int i915_gem_vm_bind_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file)
+{
+ struct drm_i915_gem_vm_bind *args = data;
+ struct i915_address_space *vm;
+ int ret;
+
+ vm = i915_gem_vm_lookup(file->driver_priv, args->vm_id);
+ if (unlikely(!vm))
+ return -ENOENT;
+
+ ret = i915_gem_vm_bind_obj(vm, args, file);
+
+ i915_vm_put(vm);
+ return ret;
+}
+
+/**
+ * i915_gem_vm_unbind_ioctl() - ioctl function for unbinding a mapping at a
+ * specified virtual address
+ * @dev: drm_device pointer
+ * @data: ioctl data structure
+ * @file: drm_file pointer
+ *
+ * Removes the persistent mapping at the specified address and unbinds it
+ * from the device page table.
+ *
+ * Returns 0 on success, error code on failure. -ENOENT is returned if the
+ * specified mapping is not found.
+ */
+int i915_gem_vm_unbind_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file)
+{
+ struct drm_i915_gem_vm_unbind *args = data;
+ struct i915_address_space *vm;
+ int ret;
+
+ vm = i915_gem_vm_lookup(file->driver_priv, args->vm_id);
+ if (unlikely(!vm))
+ return -ENOENT;
+
+ ret = i915_gem_vm_unbind_vma(vm, args);
+
+ i915_vm_put(vm);
+ return ret;
+}
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c
index b67831833c9a..0daa70c6ed0d 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.c
@@ -12,6 +12,7 @@
#include "gem/i915_gem_internal.h"
#include "gem/i915_gem_lmem.h"
+#include "gem/i915_gem_vm_bind.h"
#include "i915_trace.h"
#include "i915_utils.h"
#include "intel_gt.h"
@@ -176,6 +177,8 @@ 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);
+ GEM_BUG_ON(!RB_EMPTY_ROOT(&vm->va.rb_root));
+ mutex_destroy(&vm->vm_bind_lock);
}
/**
@@ -202,6 +205,8 @@ static void __i915_vm_release(struct work_struct *work)
struct i915_address_space *vm =
container_of(work, struct i915_address_space, release_work);
+ i915_gem_vm_unbind_all(vm);
+
__i915_vm_close(vm);
/* Synchronize async unbinds. */
@@ -282,6 +287,11 @@ void i915_address_space_init(struct i915_address_space *vm, int subclass)
INIT_LIST_HEAD(&vm->bound_list);
INIT_LIST_HEAD(&vm->unbound_list);
+
+ vm->va = RB_ROOT_CACHED;
+ INIT_LIST_HEAD(&vm->vm_bind_list);
+ INIT_LIST_HEAD(&vm->vm_bound_list);
+ mutex_init(&vm->vm_bind_lock);
}
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 c0ca53cba9f0..b52061858161 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -259,6 +259,23 @@ struct i915_address_space {
*/
struct list_head unbound_list;
+ /**
+ * @vm_bind_mode: flag to indicate vm_bind method of binding
+ *
+ * True: allow only vm_bind method of binding.
+ * False: allow only legacy execbuff method of binding.
+ */
+ bool vm_bind_mode:1;
