// SPDX-License-Identifier: MIT
/*
* Copyright © 2019 Intel Corporation
*/
#include "i915_gem_client_blt.h"
#include "i915_gem_object_blt.h"
#include "intel_drv.h"
struct i915_sleeve {
struct i915_vma *vma;
struct drm_i915_gem_object *obj;
struct sg_table *pages;
struct i915_page_sizes page_sizes;
};
static int vma_set_pages(struct i915_vma *vma)
{
struct i915_sleeve *sleeve = vma->private;
vma->pages = sleeve->pages;
vma->page_sizes = sleeve->page_sizes;
return 0;
}
static void vma_clear_pages(struct i915_vma *vma)
{
GEM_BUG_ON(!vma->pages);
vma->pages = NULL;
}
static int vma_bind(struct i915_vma *vma,
enum i915_cache_level cache_level,
u32 flags)
{
return vma->vm->vma_ops.bind_vma(vma, cache_level, flags);
}
static void vma_unbind(struct i915_vma *vma)
{
vma->vm->vma_ops.unbind_vma(vma);
}
static const struct i915_vma_ops proxy_vma_ops = {
.set_pages = vma_set_pages,
.clear_pages = vma_clear_pages,
.bind_vma = vma_bind,
.unbind_vma = vma_unbind,
};
static struct i915_sleeve *create_sleeve(struct i915_address_space *vm,
struct drm_i915_gem_object *obj,
struct sg_table *pages,
struct i915_page_sizes *page_sizes)
{
struct i915_sleeve *sleeve;
struct i915_vma *vma;
int err;
sleeve = kzalloc(sizeof(*sleeve), GFP_KERNEL);
if (!sleeve)
return ERR_PTR(-ENOMEM);
vma = i915_vma_instance(obj, vm, NULL);
if (IS_ERR(vma)) {
err = PTR_ERR(vma);
goto err_free;
}
vma->private = sleeve;
vma->ops = &proxy_vma_ops;
sleeve->vma = vma;
sleeve->obj = i915_gem_object_get(obj);
sleeve->pages = pages;
sleeve->page_sizes = *page_sizes;
return sleeve;
err_free:
kfree(sleeve);
return ERR_PTR(err);
}
static void destroy_sleeve(struct i915_sleeve *sleeve)
{
i915_gem_object_put(sleeve->obj);
kfree(sleeve);
}
struct clear_pages_work {
struct dma_fence dma;
struct dma_fence_cb cb;
struct i915_sw_fence wait;
struct work_struct work;
struct irq_work irq_work;
struct i915_sleeve *sleeve;
struct intel_context *ce;
u32 value;
};
static const char *clear_pages_work_driver_name(struct dma_fence *fence)
{
return DRIVER_NAME;
}
static const char *clear_pages_work_timeline_name(struct dma_fence *fence)
{
return "clear";
}
static void clear_pages_work_release(struct dma_fence *fence)
{
struct clear_pages_work *w = container_of(fence, typeof(*w), dma);
destroy_sleeve(w->sleeve);
i915_sw_fence_fini(&w->wait);
BUILD_BUG_ON(offsetof(typeof(*w), dma));
dma_fence_free(&w->dma);
}
static const struct dma_fence_ops clear_pages_work_ops = {
.get_driver_name = clear_pages_work_driver_name,
.get_timeline_name = clear_pages_work_timeline_name,
.release = clear_pages_work_release,
};
static void clear_pages_signal_irq_worker(struct irq_work *work)
{
struct clear_pages_work *w = container_of(work, typeof(*w), irq_work);
dma_fence_signal(&w->dma);
dma_fence_put(&w->dma);
}
static void clear_pages_dma_fence_cb(struct dma_fence *fence,
struct dma_fence_cb *cb)
{
struct clear_pages_work *w = container_of(cb, typeof(*w), cb);
if (fence->error)
dma_fence_set_error(&w->dma, fence->error);
/*
* Push the signalling of the fence into yet another worker to avoid
* the nightmare locking around the fence spinlock.
*/
irq_work_queue(&w->irq_work);
}
static void clear_pages_worker(struct work_struct *work)
{
struct clear_pages_work *w = container_of(work, typeof(*w), work);
struct drm_i915_private *i915 = w->ce->gem_context->i915;
struct drm_i915_gem_object *obj = w->sleeve->obj;
struct i915_vma *vma = w->sleeve->vma;
struct i915_request *rq;
int err = w->dma.error;
if (unlikely(err))
goto out_signal;
if (obj->cache_dirty) {
obj->write_domain = 0;
if (i915_gem_object_has_struct_page(obj))
drm_clflush_sg(w->sleeve->pages);
obj->cache_dirty = false;
}
/* XXX: we need to kill this */
mutex_lock(&i915->drm.struct_mutex);
err = i915_vma_pin(vma, 0, 0, PIN_USER);
if (unlikely(err))
goto out_unlock;
rq = i915_request_create(w->ce);
if (IS_ERR(rq)) {
err = PTR_ERR(rq);
goto out_unpin;
}
/* There's no way the fence has signalled */
if (dma_fence_add_callback(&rq->fence, &w->cb,
clear_pages_dma_fence_cb))
GEM_BUG_ON(1);
if (w->ce->engine->emit_init_breadcrumb) {
err = w->ce->engine->emit_init_breadcrumb(rq);
if (unlikely(err))
goto out_request;
}
/* XXX: more feverish nightmares await */
i915_vma_lock(vma);
err = i915_vma_move_to_active(vma, rq, EXEC_OBJECT_WRITE);
i915_vma_unlock(vma);
if (err)
goto out_request;
err = intel_emit_vma_fill_blt(rq, vma, w->value);
out_request:
if (unlikely(err)) {
i915_request_skip(rq, err);
err = 0;
}
i915_request_add(rq);
out_unpin:
i915_vma_unpin(vma);
out_unlock:
mutex_unlock(&i915->drm.struct_mutex);
out_signal:
if (unlikely(err)) {
dma_fence_set_error(&w->dma, err);
dma_fence_signal(&w->dma);
dma_fence_put(&w->dma);
}
}
static int __i915_sw_fence_call
clear_pages_work_notify(struct i915_sw_fence *fence,
enum i915_sw_fence_notify state)
{
struct clear_pages_work *w = container_of(fence, typeof(*w), wait);
switch (state) {
case FENCE_COMPLETE:
schedule_work(&w->work);
break;
case FENCE_FREE:
dma_fence_put(&w->dma);
break;
}
return NOTIFY_DONE;
}
static DEFINE_SPINLOCK(fence_lock);
/* XXX: better name please */
int i915_gem_schedule_fill_pages_blt(struct drm_i915_gem_object *obj,
struct intel_context *ce,
struct sg_table *pages,
struct i915_page_sizes *page_sizes,
u32 value)
{
struct drm_i915_private *i915 = to_i915(obj->base.dev);
struct i915_gem_context *ctx = ce->gem_context;
struct i915_address_space *vm = ctx->vm ?: &i915->ggtt.vm;
struct clear_pages_work *work;
struct i915_sleeve *sleeve;
int err;
sleeve = create_sleeve(vm, obj, pages, page_sizes);
if (IS_ERR(sleeve))
return PTR_ERR(sleeve);
work = kmalloc(sizeof(*work), GFP_KERNEL);
if (!work) {
destroy_sleeve(sleeve);
return -ENOMEM;
}
work->value = value;
work->sleeve = sleeve;
work->ce = ce;
INIT_WORK(&work->work, clear_pages_worker);
init_irq_work(&work->irq_work, clear_pages_signal_irq_worker);
dma_fence_init(&work->dma,
&clear_pages_work_ops,
&fence_lock,
i915->mm.unordered_timeline,
0);
i915_sw_fence_init(&work->wait, clear_pages_work_notify);
i915_gem_object_lock(obj);
err = i915_sw_fence_await_reservation(&work->wait,
obj->base.resv, NULL,
true, I915_FENCE_TIMEOUT,
I915_FENCE_GFP);
if (err < 0) {
dma_fence_set_error(&work->dma, err);
} else {
reservation_object_add_excl_fence(obj->base.resv, &work->dma);
err = 0;
}
i915_gem_object_unlock(obj);
dma_fence_get(&work->dma);
i915_sw_fence_commit(&work->wait);
return err;
}
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftests/i915_gem_client_blt.c"
#endif
