[Intel-gfx] [PATCH v6 05/20] drm/i915/vm_bind: Implement bind and unbind of object
Zanoni, Paulo R
paulo.r.zanoni at intel.com
Thu Nov 10 21:21:23 UTC 2022
On Thu, 2022-11-10 at 08:32 -0800, Niranjana Vishwanathapura wrote:
> On Wed, Nov 09, 2022 at 05:28:59PM -0800, Zanoni, Paulo R wrote:
> > On Mon, 2022-11-07 at 00:51 -0800, Niranjana Vishwanathapura wrote:
> > > 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.
> > >
> > > v2: On older platforms ctx->vm is not set, check for it.
> > > In vm_bind call, add vma to vm_bind_list.
> > > Add more input validity checks.
> > > Update some documentation.
> > > v3: In vm_bind call, add vma to vm_bound_list as user can
> > > request a fence and pass to execbuf3 as input fence.
> > > Remove short term pinning with PIN_VALIDATE flag.
> > > v4: Replace vm->vm_bind_mode check with i915_gem_vm_is_vm_bind_mode().
> > > v5: Ensure all reserved fields are 0, use PIN_NOEVICT.
> > > v6: Add reserved fields to drm_i915_gem_vm_bind.
> > >
> > > Reviewed-by: Matthew Auld <matthew.auld at intel.com>
> > > Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura at intel.com>
> > > Signed-off-by: Prathap Kumar Valsan <prathap.kumar.valsan at intel.com>
> > > Signed-off-by: Andi Shyti <andi.shyti at linux.intel.com>
> > > ---
> > > drivers/gpu/drm/i915/Makefile | 1 +
> > > drivers/gpu/drm/i915/gem/i915_gem_context.h | 15 +
> > > .../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 | 324 ++++++++++++++++++
> > > drivers/gpu/drm/i915/gt/intel_gtt.c | 10 +
> > > drivers/gpu/drm/i915/gt/intel_gtt.h | 9 +
> > > 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 | 99 ++++++
> > > 11 files changed, 507 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 51704b54317c..b731f3ac80da 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_context.h b/drivers/gpu/drm/i915/gem/i915_gem_context.h
> > > index 899fa8f1e0fe..e8b41aa8f8c4 100644
> > > --- a/drivers/gpu/drm/i915/gem/i915_gem_context.h
> > > +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.h
> > > @@ -139,6 +139,21 @@ int i915_gem_context_setparam_ioctl(struct drm_device *dev, void *data,
> > > int i915_gem_context_reset_stats_ioctl(struct drm_device *dev, void *data,
> > > struct drm_file *file);
> > >
> > >
> > >
> > >
> > > +/**
> > > + * i915_gem_vm_is_vm_bind_mode() - Check if address space is in vm_bind mode
> > > + * @vm: the address space
> > > + *
> > > + * Returns:
> > > + * true: @vm is in vm_bind mode; allows only vm_bind method of binding.
> > > + * false: @vm is not in vm_bind mode; allows only legacy execbuff method
> > > + * of binding.
> > > + */
> > > +static inline bool i915_gem_vm_is_vm_bind_mode(struct i915_address_space *vm)
> > > +{
> > > + /* No support to enable vm_bind mode yet */
> > > + return false;
> > > +}
> > > +
> > > struct i915_address_space *
> > > i915_gem_vm_lookup(struct drm_i915_file_private *file_priv, u32 id);
> > >
> > >
> > >
> > >
> > > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> > > index 1160723c9d2d..c5bc9f6e887f 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 && i915_gem_vm_is_vm_bind_mode(ctx->vm)) {
> > > + 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..6f299806bee1
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
> > > @@ -0,0 +1,324 @@
> > > +// 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)
> > > +
> > > +/* Not all defined functions are used, hence use __maybe_unused */
> > > +INTERVAL_TREE_DEFINE(struct i915_vma, rb, u64, __subtree_last,
> > > + START, LAST, __maybe_unused 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 the vma and then release the object.
> > > + * As persistent vma holds object reference, it can only be destroyed
> > > + * either by vm_unbind ioctl or when VM is being released. As we are
> > > + * holding VM reference here, it is safe accessing the vma here.
> > > + */
> > > + obj = vma->obj;
> > > + i915_gem_object_lock(obj, NULL);
> > > + 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 (!i915_gem_vm_is_vm_bind_mode(vm))
> > > + return -EOPNOTSUPP;
> > > +
> > > + /* Ensure start and length fields are valid */
> > > + if (!va->length || !IS_ALIGNED(va->start, I915_GTT_PAGE_SIZE))
> > > + ret = -EINVAL;
> > > +
> > > + obj = i915_gem_object_lookup(file, va->handle);
> > > + if (!obj)
> > > + return -ENOENT;
> > > +
> > > + /* Ensure offset and length are aligned to object's max page size */
> > > + if (!IS_ALIGNED(va->offset | va->length,
> > > + i915_gem_object_max_page_size(obj->mm.placements,
> > > + obj->mm.n_placements)))
> > > + ret = -EINVAL;
> > > +
> > > + /* Check for mapping range overflow */
> > > + if (range_overflows_t(u64, va->offset, va->length, obj->base.size))
> > > + ret = -EINVAL;
> > > +
> > > + if (ret)
> > > + 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 |
> > > + PIN_VALIDATE | PIN_NOEVICT;
> > > +
> > > + 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;
> > > +
> > > + 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;
> > > +
> > > + /* Reserved fields must be 0 */
> > > + if (args->rsvd[0] || args->rsvd[1] || args->rsvd[2] || args->extensions)
> > > + return -EINVAL;
> > > +
> > > + 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;
> > > +
> > > + /* Reserved fields must be 0 */
> > > + if (args->rsvd || args->rsvd2[0] || args->rsvd2[1] ||
> > > + args->rsvd2[2] || args->extensions)
> > > + return -EINVAL;
> > > +
> > > + 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 e82a9d763e57..412368c67c46 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"
> > > @@ -177,6 +178,8 @@ 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);
> > > }
> > >
> > >
> > >
> > >
> > > /**
> > > @@ -203,6 +206,8 @@ 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. */
> > > @@ -279,6 +284,11 @@ 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 4d75ba4bb41d..3a9bee1b9d03 100644
> > > --- a/drivers/gpu/drm/i915/gt/intel_gtt.h
> > > +++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
> > > @@ -260,6 +260,15 @@ struct i915_address_space {
> > > */
> > > struct list_head unbound_list;
> > >
> > >
> > >
> > >
> > > + /** @vm_bind_lock: Mutex to protect @vm_bind_list and @vm_bound_list */
> > > + struct mutex vm_bind_lock;
> > > + /** @vm_bind_list: List of vm_binding in process */
> > > + struct list_head vm_bind_list;
> > > + /** @vm_bound_list: List of vm_binding completed */
> > > + struct list_head vm_bound_list;
> > > + /** @va: tree of persistent vmas */
> > > + struct rb_root_cached va;
> > > +
> > > /* Global GTT */
> > > bool is_ggtt:1;
> > >
> > >
> > >
> > >
> > > diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
> > > index c3d43f9b1e45..cf41b96ac485 100644
> > > --- a/drivers/gpu/drm/i915/i915_driver.c
> > > +++ b/drivers/gpu/drm/i915/i915_driver.c
> > > @@ -69,6 +69,7 @@
> > > #include "gem/i915_gem_ioctls.h"
> > > #include "gem/i915_gem_mman.h"
> > > #include "gem/i915_gem_pm.h"
> > > +#include "gem/i915_gem_vm_bind.h"
> > > #include "gt/intel_gt.h"
> > > #include "gt/intel_gt_pm.h"
> > > #include "gt/intel_rc6.h"
> > > @@ -1892,6 +1893,8 @@ static const struct drm_ioctl_desc i915_ioctls[] = {
> > > DRM_IOCTL_DEF_DRV(I915_QUERY, i915_query_ioctl, DRM_RENDER_ALLOW),
> > > DRM_IOCTL_DEF_DRV(I915_GEM_VM_CREATE, i915_gem_vm_create_ioctl, DRM_RENDER_ALLOW),
> > > DRM_IOCTL_DEF_DRV(I915_GEM_VM_DESTROY, i915_gem_vm_destroy_ioctl, DRM_RENDER_ALLOW),
> > > + DRM_IOCTL_DEF_DRV(I915_GEM_VM_BIND, i915_gem_vm_bind_ioctl, DRM_RENDER_ALLOW),
> > > + DRM_IOCTL_DEF_DRV(I915_GEM_VM_UNBIND, i915_gem_vm_unbind_ioctl, DRM_RENDER_ALLOW),
> > > };
> > >
> > >
> > >
> > >
> > > /*
> > > diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
> > > index 529d97318f00..6a64a130dbcd 100644
> > > --- a/drivers/gpu/drm/i915/i915_vma.c
> > > +++ b/drivers/gpu/drm/i915/i915_vma.c
> > > @@ -239,6 +239,7 @@ vma_create(struct drm_i915_gem_object *obj,
> > > spin_unlock(&obj->vma.lock);
> > > mutex_unlock(&vm->mutex);
> > >
> > >
> > >
> > >
> > > + INIT_LIST_HEAD(&vma->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 3144d71a0c3e..db786d2d1530 100644
> > > --- a/drivers/gpu/drm/i915/i915_vma_types.h
> > > +++ b/drivers/gpu/drm/i915/i915_vma_types.h
> > > @@ -295,6 +295,20 @@ struct i915_vma {
> > > /** This object's place on the active/inactive lists */
> > > struct list_head vm_link;
> > >
> > >
> > >
> > >
> > > + /** @vm_bind_link: node for the vm_bind related lists of vm */
> > > + struct list_head vm_bind_link;
> > > +
> > > + /** Interval tree structures for persistent vma */
> > > +
> > > + /** @rb: node for the interval tree of vm for persistent vmas */
> > > + struct rb_node rb;
> > > + /** @start: start endpoint of the rb node */
> > > + u64 start;
> > > + /** @last: Last endpoint of the rb node */
> > > + u64 last;
> > > + /** @__subtree_last: last in subtree */
> > > + u64 __subtree_last;
> > > +
> > > struct list_head obj_link; /* Link in the object's VMA list */
> > > struct rb_node obj_node;
> > > struct hlist_node obj_hash;
> > > diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> > > index 8df261c5ab9b..f06a09f1db2d 100644
> > > --- a/include/uapi/drm/i915_drm.h
> > > +++ b/include/uapi/drm/i915_drm.h
> > > @@ -470,6 +470,8 @@ typedef struct _drm_i915_sarea {
> > > #define DRM_I915_GEM_VM_CREATE 0x3a
> > > #define DRM_I915_GEM_VM_DESTROY 0x3b
> > > #define DRM_I915_GEM_CREATE_EXT 0x3c
> > > +#define DRM_I915_GEM_VM_BIND 0x3d
> > > +#define DRM_I915_GEM_VM_UNBIND 0x3e
> > > /* Must be kept compact -- no holes */
> > >
> > >
> > >
> > >
> > > #define DRM_IOCTL_I915_INIT DRM_IOW( DRM_COMMAND_BASE + DRM_I915_INIT, drm_i915_init_t)
> > > @@ -534,6 +536,8 @@ typedef struct _drm_i915_sarea {
> > > #define DRM_IOCTL_I915_QUERY DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_QUERY, struct drm_i915_query)
> > > #define DRM_IOCTL_I915_GEM_VM_CREATE DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_VM_CREATE, struct drm_i915_gem_vm_control)
> > > #define DRM_IOCTL_I915_GEM_VM_DESTROY DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_VM_DESTROY, struct drm_i915_gem_vm_control)
> > > +#define DRM_IOCTL_I915_GEM_VM_BIND DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_VM_BIND, struct drm_i915_gem_vm_bind)
> > > +#define DRM_IOCTL_I915_GEM_VM_UNBIND DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_VM_UNBIND, struct drm_i915_gem_vm_unbind)
> > >
> > >
> > >
> > >
> > > /* Allow drivers to submit batchbuffers directly to hardware, relying
> > > * on the security mechanisms provided by hardware.
> > > @@ -3727,6 +3731,101 @@ 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_vm_bind - VA to object mapping to bind.
> > > + *
> > > + * This structure is passed to VM_BIND ioctl and specifies the mapping of GPU
> > > + * virtual address (VA) range to the section of an object that should be bound
> > > + * in the device page table of the specified address space (VM).
> > > + * The VA range specified must be unique (ie., not currently bound) and can
> > > + * be mapped to whole object or a section of the object (partial binding).
> > > + * Multiple VA mappings can be created to the same section of the object
> > > + * (aliasing).
> > > + *
> > > + * The @start, @offset and @length must be 4K page aligned. However the DG2
> > > + * and XEHPSDV has 64K page size for device local memory and has compact page
> > > + * table. On those platforms, for binding device local-memory objects, the
> > > + * @start, @offset and @length must be 64K aligned.
> > > + *
> > > + * Error code -EINVAL will be returned if @start, @offset and @length are not
> > > + * properly aligned. In version 1 (See I915_PARAM_VM_BIND_VERSION), error code
> > > + * -ENOSPC will be returned if the VA range specified can't be reserved.
> > > + *
> > > + * VM_BIND/UNBIND ioctl calls executed on different CPU threads concurrently
> > > + * are not ordered. Furthermore, parts of the VM_BIND operation can be done
> > > + * asynchronously, if valid @fence is specified.
> > > + */
> > > +struct drm_i915_gem_vm_bind {
> > > + /** @vm_id: VM (address space) id to bind */
> > > + __u32 vm_id;
> > > +
> > > + /** @handle: Object handle */
> > > + __u32 handle;
> > > +
> > > + /** @start: Virtual Address start to bind */
> > > + __u64 start;
> > > +
> > > + /** @offset: Offset in object to bind */
> > > + __u64 offset;
> > > +
> > > + /** @length: Length of mapping to bind */
> > > + __u64 length;
> > > +
> > > + /** @rsvd: Reserved, MBZ */
> > > + __u64 rsvd[3];
> >
> > In a brand new ioctl with even extensions support, why do we need this?
> > If we have a plan to add something here in the future, can you please
> > tell us what it may be? Perhaps having that field already but accepting
> > only a default value/flag would be better.
> >
>
> 1 quad word is for flags and other 2 are reseved. I had the flag defined
> previously, but changed it to reserved based on review comments.
> Yes, we have extension, but I think it is OK to have some reserved fields
> (I see other examples here). There are some future expansion plans (like
> PAT setting support etc) anyhow. Is that fine?
>
> > I see in previous versions we had 'flags' here. Having 'flags', even if
> > MBZ for the initial version, seems like a nice thing to have for future
> > extensibility. Also, you're going to add back the flag to make the page
> > read-only at some point, right?
>
> Yah, I can separte out the flags here and in vm_unbind. Matt, hope that is
> fine.
I would prefer to already have the flags fields defined (both here and
in unbind), even if they are MBZ. That makes the life of user space
slightly easier. When you add flags, just bump the version of vm_bind
that we can already query, so we can know the Kernel supports those
flags.
Thanks,
Paulo
>
> >
> > > +
> > > + /** @rsvd2: Reserved for timeline fence */
> > > + __u64 rsvd2[2];
> >
> > I see this one gets changed in the middle of the series.
> >
>
> Yah we reserve it for timeline fence here in this patch,
> timeline fence support is added in a later patch in this series.
>
> > > +
> > > + /**
> > > + * @extensions: Zero-terminated chain of extensions.
> > > + *
> > > + * For future extensions. See struct i915_user_extension.
> > > + */
> > > + __u64 extensions;
> > > +};
> > > +
> > > +/**
> > > + * struct drm_i915_gem_vm_unbind - VA to object mapping to unbind.
> > > + *
> > > + * This structure is passed to VM_UNBIND ioctl and specifies the GPU virtual
> > > + * address (VA) range that should be unbound from the device page table of the
> > > + * specified address space (VM). VM_UNBIND will force unbind the specified
> > > + * range from device page table without waiting for any GPU job to complete.
> > > + * It is UMDs responsibility to ensure the mapping is no longer in use before
> > > + * calling VM_UNBIND.
> > > + *
> > > + * If the specified mapping is not found, the ioctl will simply return without
> > > + * any error.
> > > + *
> > > + * VM_BIND/UNBIND ioctl calls executed on different CPU threads concurrently
> > > + * are not ordered. Furthermore, parts of the VM_UNBIND operation can be done
> > > + * asynchronously, if valid @fence is specified.
> >
> > What @fence? There's no way to specify one.
> >
>
> Yah, will remove "if valid @fence is specified".
>
> > > + */
> > > +struct drm_i915_gem_vm_unbind {
> > > + /** @vm_id: VM (address space) id to bind */
> > > + __u32 vm_id;
> > > +
> > > + /** @rsvd: Reserved, MBZ */
> > > + __u32 rsvd;
> >
> > Again here, same question. Perhaps we could name it 'pad' or 'pad0' if
> > that's the specific goal of having this?
> >
>
> Yah, pad is appropriate here.
>
> > > +
> > > + /** @start: Virtual Address start to unbind */
> > > + __u64 start;
> > > +
> > > + /** @length: Length of mapping to unbind */
> > > + __u64 length;
> > > +
> > > + /** @rsvd2: Reserved, MBZ */
> > > + __u64 rsvd2[3];
> >
> > And here, but this is definitely not just padding.
> >
>
> It is for 'flags' and 'timeline fence' in case we need them later on.
>
> Niranjana
>
> > > +
> > > + /**
> > > + * @extensions: Zero-terminated chain of extensions.
> > > + *
> > > + * For future extensions. See struct i915_user_extension.
> > > + */
> > > + __u64 extensions;
> > > +};
> > > +
> > > #if defined(__cplusplus)
> > > }
> > > #endif
> >
More information about the Intel-gfx
mailing list