[Intel-gfx] [RFC 05/10] drm/i915/vm_bind: Handle persistent vmas
Ramalingam C
ramalingam.c at intel.com
Tue Jul 5 09:20:09 UTC 2022
On 2022-07-04 at 17:05:38 +0000, Zeng, Oak wrote:
>
>
> Thanks,
> Oak
>
> > -----Original Message-----
> > From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On Behalf Of
> > Niranjana Vishwanathapura
> > Sent: July 1, 2022 6:51 PM
> > To: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org
> > Cc: Zanoni, Paulo R <paulo.r.zanoni at intel.com>; Hellstrom, Thomas
> > <thomas.hellstrom at intel.com>; Auld, Matthew <matthew.auld at intel.com>;
> > Vetter, Daniel <daniel.vetter at intel.com>; christian.koenig at amd.com
> > Subject: [Intel-gfx] [RFC 05/10] drm/i915/vm_bind: Handle persistent vmas
> >
> > Treat VM_BIND vmas as persistent and handle them during the request
> > submission in the execbuff path.
>
> Hi Niranjana,
>
> Is the meaning of "persistent" above persistent across all the subsequent execbuf ioctls?
Yes oak. Thats correct. persistent across multiple execbuf ioctls.
Regards,
Ram.
>
> Thanks,
> Oak
>
> >
> > Support eviction by maintaining a list of evicted persistent vmas for rebinding
> > during next submission.
> >
> > Signed-off-by: Niranjana Vishwanathapura
> > <niranjana.vishwanathapura at intel.com>
> > ---
> > drivers/gpu/drm/i915/gem/i915_gem_object.c | 1 +
> > drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h | 3 +
> > .../drm/i915/gem/i915_gem_vm_bind_object.c | 12 ++-
> > drivers/gpu/drm/i915/gt/intel_gtt.c | 2 +
> > drivers/gpu/drm/i915/gt/intel_gtt.h | 2 +
> > drivers/gpu/drm/i915/i915_gem_gtt.h | 22 ++++++
> > drivers/gpu/drm/i915/i915_vma.c | 32 +++++++-
> > drivers/gpu/drm/i915/i915_vma.h | 78 +++++++++++++++++--
> > drivers/gpu/drm/i915/i915_vma_types.h | 23 ++++++
> > 9 files changed, 163 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c
> > b/drivers/gpu/drm/i915/gem/i915_gem_object.c
> > index ccec4055fde3..5121f02ba95c 100644
> > --- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
> > +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
> > @@ -38,6 +38,7 @@
> > #include "i915_gem_mman.h"
> > #include "i915_gem_object.h"
> > #include "i915_gem_ttm.h"
> > +#include "i915_gem_vm_bind.h"
> > #include "i915_memcpy.h"
> > #include "i915_trace.h"
> >
> > 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 849bf3c1061e..eaadf5a6ab09 100644
> > --- a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h
> > +++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h
> > @@ -6,6 +6,7 @@
> > #ifndef __I915_GEM_VM_BIND_H
> > #define __I915_GEM_VM_BIND_H
> >
> > +#include <linux/dma-resv.h>
> > #include "i915_drv.h"
> >
> > #define assert_vm_bind_held(vm) lockdep_assert_held(&(vm)-
> > >vm_bind_lock)
> > @@ -26,6 +27,8 @@ static inline void i915_gem_vm_bind_unlock(struct
> > i915_address_space *vm)
> > mutex_unlock(&vm->vm_bind_lock);
> > }
> >
> > +#define assert_vm_priv_held(vm) assert_object_held((vm)->root_obj)
> > +
> > static inline int i915_gem_vm_priv_lock(struct i915_address_space *vm,
> > struct i915_gem_ww_ctx *ww)
> > {
> > 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 96f139cc8060..1a8efa83547f 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 +85,13 @@ void i915_gem_vm_bind_remove(struct i915_vma
> > *vma, bool release_obj) {
> > assert_vm_bind_held(vma->vm);
> >
> > + spin_lock(&vma->vm->vm_rebind_lock);
> > + if (!list_empty(&vma->vm_rebind_link))
> > + list_del_init(&vma->vm_rebind_link);
> > + i915_vma_set_purged(vma);
> > + i915_vma_set_freed(vma);
> > + spin_unlock(&vma->vm->vm_rebind_lock);
> > +
> > if (!list_empty(&vma->vm_bind_link)) {
> > list_del_init(&vma->vm_bind_link);
> > list_del_init(&vma->non_priv_vm_bind_link);
> > @@ -220,6 +227,7 @@ static struct i915_vma *vm_bind_get_vma(struct
> > i915_address_space *vm,
> >
> > vma->start = va->start;
> > vma->last = va->start + va->length - 1;
> > + i915_vma_set_persistent(vma);
> >
> > return vma;
> > }
> > @@ -304,8 +312,10 @@ int i915_gem_vm_bind_obj(struct
> > i915_address_space *vm,
> >
> > i915_vm_bind_put_fence(vma);
> > put_vma:
> > - if (ret)
> > + if (ret) {
> > + i915_vma_set_freed(vma);
> > i915_vma_destroy(vma);
> > + }
> >
> > i915_gem_ww_ctx_fini(&ww);
> > unlock_vm:
> > diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c
> > b/drivers/gpu/drm/i915/gt/intel_gtt.c
> > index df0a8459c3c6..55d5389b2c6c 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_gtt.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_gtt.c
> > @@ -293,6 +293,8 @@ void i915_address_space_init(struct
> > i915_address_space *vm, int subclass)
> > 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));
> > + INIT_LIST_HEAD(&vm->vm_rebind_list);
> > + spin_lock_init(&vm->vm_rebind_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 f538ce9115c9..fe5485c4a1cd 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_gtt.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
> > @@ -265,6 +265,8 @@ struct i915_address_space {
> > struct mutex vm_bind_lock; /* Protects vm_bind lists */
> > struct list_head vm_bind_list;
> > struct list_head vm_bound_list;
> > + struct list_head vm_rebind_list;
> > + spinlock_t vm_rebind_lock; /* Protects vm_rebind_list */
> > /* va tree of persistent vmas */
> > struct rb_root_cached va;
> > struct list_head non_priv_vm_bind_list; diff --git
> > a/drivers/gpu/drm/i915/i915_gem_gtt.h
> > b/drivers/gpu/drm/i915/i915_gem_gtt.h
> > index 8c2f57eb5dda..09b89d1913fc 100644
> > --- a/drivers/gpu/drm/i915/i915_gem_gtt.h
> > +++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
> > @@ -51,4 +51,26 @@ int i915_gem_gtt_insert(struct i915_address_space
> > *vm,
> >
> > #define PIN_OFFSET_MASK I915_GTT_PAGE_MASK
> >
> > +static inline int i915_vm_sync(struct i915_address_space *vm) {
> > + int ret;
> > +
> > + /* Wait for all requests under this vm to finish */
> > + ret = dma_resv_wait_timeout(vm->root_obj->base.resv,
> > + DMA_RESV_USAGE_BOOKKEEP, false,
> > + MAX_SCHEDULE_TIMEOUT);
> > + if (ret < 0)
> > + return ret;
> > + else if (ret > 0)
> > + return 0;
> > + else
> > + return -ETIMEDOUT;
> > +}
> > +
> > +static inline bool i915_vm_is_active(const struct i915_address_space
> > +*vm) {
> > + return !dma_resv_test_signaled(vm->root_obj->base.resv,
> > + DMA_RESV_USAGE_BOOKKEEP);
> > +}
> > +
> > #endif
> > diff --git a/drivers/gpu/drm/i915/i915_vma.c
> > b/drivers/gpu/drm/i915/i915_vma.c index 6737236b7884..6adb013579be
> > 100644
> > --- a/drivers/gpu/drm/i915/i915_vma.c
> > +++ b/drivers/gpu/drm/i915/i915_vma.c
> > @@ -237,6 +237,7 @@ vma_create(struct drm_i915_gem_object *obj,
> >
> > INIT_LIST_HEAD(&vma->vm_bind_link);
> > INIT_LIST_HEAD(&vma->non_priv_vm_bind_link);
> > + INIT_LIST_HEAD(&vma->vm_rebind_link);
> > return vma;
> >
> > err_unlock:
> > @@ -1622,7 +1623,8 @@ void i915_vma_close(struct i915_vma *vma)
> > if (atomic_dec_and_lock_irqsave(&vma->open_count,
> > >->closed_lock,
> > flags)) {
> > - __vma_close(vma, gt);
> > + if (!i915_vma_is_persistent(vma))
> > + __vma_close(vma, gt);
> > spin_unlock_irqrestore(>->closed_lock, flags);
> > }
> > }
> > @@ -1647,6 +1649,13 @@ static void force_unbind(struct i915_vma *vma)
> > if (!drm_mm_node_allocated(&vma->node))
> > return;
> >
> > + /*
> > + * Mark persistent vma as purged to avoid it waiting
> > + * for VM to be released.
> > + */
> > + if (i915_vma_is_persistent(vma))
> > + i915_vma_set_purged(vma);
> > +
> > atomic_and(~I915_VMA_PIN_MASK, &vma->flags);
> > WARN_ON(__i915_vma_unbind(vma));
> > GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
> > @@ -1666,9 +1675,12 @@ static void release_references(struct i915_vma
> > *vma, bool vm_ddestroy)
> >
> > spin_unlock(&obj->vma.lock);
> >
> > - i915_gem_vm_bind_lock(vma->vm);
> > - i915_gem_vm_bind_remove(vma, true);
> > - i915_gem_vm_bind_unlock(vma->vm);
> > + if (i915_vma_is_persistent(vma) &&
> > + !i915_vma_is_freed(vma)) {
> > + i915_gem_vm_bind_lock(vma->vm);
> > + i915_gem_vm_bind_remove(vma, true);
> > + i915_gem_vm_bind_unlock(vma->vm);
> > + }
> >
> > spin_lock_irq(>->closed_lock);
> > __i915_vma_remove_closed(vma);
> > @@ -1839,6 +1851,8 @@ int _i915_vma_move_to_active(struct i915_vma
> > *vma,
> > int err;
> >
> > assert_object_held(obj);
> > + if (i915_vma_is_persistent(vma))
> > + return -EINVAL;
> >
> > GEM_BUG_ON(!vma->pages);
> >
> > @@ -1999,6 +2013,16 @@ int __i915_vma_unbind(struct i915_vma *vma)
> > __i915_vma_evict(vma, false);
> >
> > drm_mm_remove_node(&vma->node); /* pairs with
> > i915_vma_release() */
> > +
> > + if (i915_vma_is_persistent(vma)) {
> > + spin_lock(&vma->vm->vm_rebind_lock);
> > + if (list_empty(&vma->vm_rebind_link) &&
> > + !i915_vma_is_purged(vma))
> > + list_add_tail(&vma->vm_rebind_link,
> > + &vma->vm->vm_rebind_list);
> > + spin_unlock(&vma->vm->vm_rebind_lock);
> > + }
> > +
> > return 0;
> > }
> >
> > diff --git a/drivers/gpu/drm/i915/i915_vma.h
> > b/drivers/gpu/drm/i915/i915_vma.h index dcb49f79ff7e..6c1369a40e03
> > 100644
> > --- a/drivers/gpu/drm/i915/i915_vma.h
> > +++ b/drivers/gpu/drm/i915/i915_vma.h
> > @@ -47,12 +47,6 @@ i915_vma_instance(struct drm_i915_gem_object *obj,
> >
> > void i915_vma_unpin_and_release(struct i915_vma **p_vma, unsigned int
> > flags); #define I915_VMA_RELEASE_MAP BIT(0)
> > -
> > -static inline bool i915_vma_is_active(const struct i915_vma *vma) -{
> > - return !i915_active_is_idle(&vma->active);
> > -}
> > -
> > /* do not reserve memory to prevent deadlocks */ #define
> > __EXEC_OBJECT_NO_RESERVE BIT(31)
> >
> > @@ -138,6 +132,48 @@ static inline u32 i915_ggtt_pin_bias(struct i915_vma
> > *vma)
> > return i915_vm_to_ggtt(vma->vm)->pin_bias;
> > }
> >
> > +static inline bool i915_vma_is_persistent(const struct i915_vma *vma) {
> > + return test_bit(I915_VMA_PERSISTENT_BIT,
> > __i915_vma_flags(vma)); }
> > +
> > +static inline void i915_vma_set_persistent(struct i915_vma *vma) {
> > + set_bit(I915_VMA_PERSISTENT_BIT, __i915_vma_flags(vma)); }
> > +
> > +static inline bool i915_vma_is_purged(const struct i915_vma *vma) {
> > + return test_bit(I915_VMA_PURGED_BIT, __i915_vma_flags(vma)); }
> > +
> > +static inline void i915_vma_set_purged(struct i915_vma *vma) {
> > + set_bit(I915_VMA_PURGED_BIT, __i915_vma_flags(vma)); }
> > +
> > +static inline bool i915_vma_is_freed(const struct i915_vma *vma) {
> > + return test_bit(I915_VMA_FREED_BIT, __i915_vma_flags(vma)); }
> > +
> > +static inline void i915_vma_set_freed(struct i915_vma *vma) {
> > + set_bit(I915_VMA_FREED_BIT, __i915_vma_flags(vma)); }
> > +
> > +static inline bool i915_vma_is_active(const struct i915_vma *vma) {
> > + if (i915_vma_is_persistent(vma)) {
> > + if (i915_vma_is_purged(vma))
> > + return false;
> > +
> > + return i915_vm_is_active(vma->vm);
> > + }
> > +
> > + return !i915_active_is_idle(&vma->active);
> > +}
> > +
> > static inline struct i915_vma *i915_vma_get(struct i915_vma *vma) {
> > i915_gem_object_get(vma->obj);
> > @@ -408,8 +444,36 @@ int i915_vma_wait_for_bind(struct i915_vma *vma);
> >
> > static inline int i915_vma_sync(struct i915_vma *vma) {
> > + int ret;
> > +
> > /* Wait for the asynchronous bindings and pending GPU reads */
> > - return i915_active_wait(&vma->active);
> > + ret = i915_active_wait(&vma->active);
> > + if (ret || !i915_vma_is_persistent(vma) ||
> > i915_vma_is_purged(vma))
> > + return ret;
> > +
> > + return i915_vm_sync(vma->vm);
> > +}
> > +
> > +static inline bool i915_vma_is_bind_complete(struct i915_vma *vma) {
> > + /* Ensure vma bind is initiated */
> > + if (!i915_vma_is_bound(vma, I915_VMA_BIND_MASK))
> > + return false;
> > +
> > + /* Ensure any binding started is complete */
> > + if (rcu_access_pointer(vma->active.excl.fence)) {
> > + struct dma_fence *fence;
> > +
> > + rcu_read_lock();
> > + fence = dma_fence_get_rcu_safe(&vma->active.excl.fence);
> > + rcu_read_unlock();
> > + if (fence) {
> > + dma_fence_put(fence);
> > + return false;
> > + }
> > + }
> > +
> > + return true;
> > }
> >
> > /**
> > diff --git a/drivers/gpu/drm/i915/i915_vma_types.h
> > b/drivers/gpu/drm/i915/i915_vma_types.h
> > index 7d830a6a0b51..405c82e1bc30 100644
> > --- a/drivers/gpu/drm/i915/i915_vma_types.h
> > +++ b/drivers/gpu/drm/i915/i915_vma_types.h
> > @@ -264,6 +264,28 @@ struct i915_vma {
> > #define I915_VMA_SCANOUT_BIT 17
> > #define I915_VMA_SCANOUT ((int)BIT(I915_VMA_SCANOUT_BIT))
> >
> > + /**
> > + * I915_VMA_PERSISTENT_BIT:
> > + * The vma is persistent (created with VM_BIND call).
> > + *
> > + * I915_VMA_PURGED_BIT:
> > + * The persistent vma is force unbound either due to VM_UNBIND call
> > + * from UMD or VM is released. Do not check/wait for VM activeness
> > + * in i915_vma_is_active() and i915_vma_sync() calls.
> > + *
> > + * I915_VMA_FREED_BIT:
> > + * The persistent vma is being released by UMD via VM_UNBIND call.
> > + * While releasing the vma, do not take VM_BIND lock as VM_UNBIND call
> > + * already holds the lock.
> > + */
> > +#define I915_VMA_PERSISTENT_BIT 19
> > +#define I915_VMA_PURGED_BIT 20
> > +#define I915_VMA_FREED_BIT 21
> > +
> > +#define I915_VMA_PERSISTENT
> > ((int)BIT(I915_VMA_PERSISTENT_BIT))
> > +#define I915_VMA_PURGED ((int)BIT(I915_VMA_PURGED_BIT))
> > +#define I915_VMA_FREED ((int)BIT(I915_VMA_FREED_BIT))
> > +
> > struct i915_active active;
> >
> > #define I915_VMA_PAGES_BIAS 24
> > @@ -292,6 +314,7 @@ struct i915_vma {
> > 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;
> > + struct list_head vm_rebind_link; /* Link in vm_rebind_list */
> >
> > /** Timeline fence for vm_bind completion notification */
> > struct {
> > --
> > 2.21.0.rc0.32.g243a4c7e27
>
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