#include "i915_trace.h"
#include "intel_drv.h"
+/**
+ * DOC: Global GTT views
+ *
+ * Background and previous state
+ *
+ * Historically objects could exists (be bound) in global GTT space only as
+ * singular instances with a view representing all of the object's backing pages
+ * in a linear fashion. This view will be called a normal view.
+ *
+ * To support multiple views of the same object, where the number of mapped
+ * pages is not equal to the backing store, or where the layout of the pages
+ * is not linear, concept of a GGTT view was added.
+ *
+ * One example of an alternative view is a stereo display driven by a single
+ * image. In this case we would have a framebuffer looking like this
+ * (2x2 pages):
+ *
+ * 12
+ * 34
+ *
+ * Above would represent a normal GGTT view as normally mapped for GPU or CPU
+ * rendering. In contrast, fed to the display engine would be an alternative
+ * view which could look something like this:
+ *
+ * 1212
+ * 3434
+ *
+ * In this example both the size and layout of pages in the alternative view is
+ * different from the normal view.
+ *
+ * Implementation and usage
+ *
+ * GGTT views are implemented using VMAs and are distinguished via enum
+ * i915_ggtt_view_type and struct i915_ggtt_view.
+ *
+ * A new flavour of core GEM functions which work with GGTT bound objects were
+ * added with the _view suffix. They take the struct i915_ggtt_view parameter
+ * encapsulating all metadata required to implement a view.
+ *
+ * As a helper for callers which are only interested in the normal view,
+ * globally const i915_ggtt_view_normal singleton instance exists. All old core
+ * GEM API functions, the ones not taking the view parameter, are operating on,
+ * or with the normal GGTT view.
+ *
+ * Code wanting to add or use a new GGTT view needs to:
+ *
+ * 1. Add a new enum with a suitable name.
+ * 2. Extend the metadata in the i915_ggtt_view structure if required.
+ * 3. Add support to i915_get_vma_pages().
+ *
+ * New views are required to build a scatter-gather table from within the
+ * i915_get_vma_pages function. This table is stored in the vma.ggtt_view and
+ * exists for the lifetime of an VMA.
+ *
+ * Core API is designed to have copy semantics which means that passed in
+ * struct i915_ggtt_view does not need to be persistent (left around after
+ * calling the core API functions).
+ *
+ */
+
+const struct i915_ggtt_view i915_ggtt_view_normal;
+
static void bdw_setup_private_ppat(struct drm_i915_private *dev_priv);
static void chv_setup_private_ppat(struct drm_i915_private *dev_priv);
has_aliasing_ppgtt = INTEL_INFO(dev)->gen >= 6;
has_full_ppgtt = INTEL_INFO(dev)->gen >= 7;
- if (IS_GEN8(dev))
- has_full_ppgtt = false; /* XXX why? */
/*
* We don't allow disabling PPGTT for gen9+ as it's a requirement for
return 0;
}
- return has_aliasing_ppgtt ? 1 : 0;
+ if (INTEL_INFO(dev)->gen >= 8 && i915.enable_execlists)
+ return 2;
+ else
+ return has_aliasing_ppgtt ? 1 : 0;
}
pte |= GEN6_PTE_UNCACHED;
break;
default:
- WARN_ON(1);
+ MISSING_CASE(level);
}
return pte;
pte |= GEN6_PTE_UNCACHED;
break;
default:
- WARN_ON(1);
+ MISSING_CASE(level);
}
return pte;
ppgtt->base.clear_range(&ppgtt->base, 0, ppgtt->base.total, true);
- DRM_DEBUG_DRIVER("Allocated pde space (%ldM) at GTT entry: %lx\n",
+ DRM_DEBUG_DRIVER("Allocated pde space (%lldM) at GTT entry: %llx\n",
ppgtt->node.size >> 20,
ppgtt->node.start / PAGE_SIZE);
if (INTEL_INFO(dev)->gen < 8)
return gen6_ppgtt_init(ppgtt);
- else if (IS_GEN8(dev) || IS_GEN9(dev))
- return gen8_ppgtt_init(ppgtt, dev_priv->gtt.base.total);
else
- BUG();
+ return gen8_ppgtt_init(ppgtt, dev_priv->gtt.base.total);
}
int i915_ppgtt_init(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt)
{
else if (INTEL_INFO(dev)->gen >= 8)
gen8_ppgtt_enable(dev);
else
- WARN_ON(1);
+ MISSING_CASE(INTEL_INFO(dev)->gen);
if (ppgtt) {
for_each_ring(ring, dev_priv, i) {
/* The bind_vma code tries to be smart about tracking mappings.
* Unfortunately above, we've just wiped out the mappings
* without telling our object about it. So we need to fake it.
+ *
+ * Bind is not expected to fail since this is only called on
+ * resume and assumption is all requirements exist already.
*/
vma->bound &= ~GLOBAL_BIND;
- vma->bind_vma(vma, obj->cache_level, GLOBAL_BIND);
+ WARN_ON(i915_vma_bind(vma, obj->cache_level, GLOBAL_BIND));
}
AGP_USER_MEMORY : AGP_USER_CACHED_MEMORY;
BUG_ON(!i915_is_ggtt(vma->vm));
- intel_gtt_insert_sg_entries(vma->obj->pages, entry, flags);
+ intel_gtt_insert_sg_entries(vma->ggtt_view.pages, entry, flags);
vma->bound = GLOBAL_BIND;
}
if (!dev_priv->mm.aliasing_ppgtt || flags & GLOBAL_BIND) {
if (!(vma->bound & GLOBAL_BIND) ||
(cache_level != obj->cache_level)) {
- vma->vm->insert_entries(vma->vm, obj->pages,
+ vma->vm->insert_entries(vma->vm, vma->ggtt_view.pages,
vma->node.start,
cache_level, flags);
vma->bound |= GLOBAL_BIND;
(cache_level != obj->cache_level))) {
struct i915_hw_ppgtt *appgtt = dev_priv->mm.aliasing_ppgtt;
appgtt->base.insert_entries(&appgtt->base,
- vma->obj->pages,
+ vma->ggtt_view.pages,
vma->node.start,
cache_level, flags);
vma->bound |= LOCAL_BIND;
static void i915_gtt_color_adjust(struct drm_mm_node *node,
unsigned long color,
- unsigned long *start,
- unsigned long *end)
+ u64 *start,
+ u64 *end)
{
if (node->color != color)
*start += 4096;
}
static struct i915_vma *__i915_gem_vma_create(struct drm_i915_gem_object *obj,
- struct i915_address_space *vm)
+ struct i915_address_space *vm,
+ const struct i915_ggtt_view *view)
{
struct i915_vma *vma = kzalloc(sizeof(*vma), GFP_KERNEL);
if (vma == NULL)
INIT_LIST_HEAD(&vma->exec_list);
vma->vm = vm;
vma->obj = obj;
+ vma->ggtt_view = *view;
- switch (INTEL_INFO(vm->dev)->gen) {
- case 9:
- case 8:
- case 7:
- case 6:
+ if (INTEL_INFO(vm->dev)->gen >= 6) {
if (i915_is_ggtt(vm)) {
vma->unbind_vma = ggtt_unbind_vma;
vma->bind_vma = ggtt_bind_vma;
vma->unbind_vma = ppgtt_unbind_vma;
vma->bind_vma = ppgtt_bind_vma;
}
- break;
- case 5:
- case 4:
- case 3:
- case 2:
+ } else {
BUG_ON(!i915_is_ggtt(vm));
vma->unbind_vma = i915_ggtt_unbind_vma;
vma->bind_vma = i915_ggtt_bind_vma;
- break;
- default:
- BUG();
}
- /* Keep GGTT vmas first to make debug easier */
- if (i915_is_ggtt(vm))
- list_add(&vma->vma_link, &obj->vma_list);
- else {
- list_add_tail(&vma->vma_link, &obj->vma_list);
+ list_add_tail(&vma->vma_link, &obj->vma_list);
+ if (!i915_is_ggtt(vm))
i915_ppgtt_get(i915_vm_to_ppgtt(vm));
- }
return vma;
}
struct i915_vma *
-i915_gem_obj_lookup_or_create_vma(struct drm_i915_gem_object *obj,
- struct i915_address_space *vm)
+i915_gem_obj_lookup_or_create_vma_view(struct drm_i915_gem_object *obj,
+ struct i915_address_space *vm,
+ const struct i915_ggtt_view *view)
{
struct i915_vma *vma;
- vma = i915_gem_obj_to_vma(obj, vm);
+ vma = i915_gem_obj_to_vma_view(obj, vm, view);
if (!vma)
- vma = __i915_gem_vma_create(obj, vm);
+ vma = __i915_gem_vma_create(obj, vm, view);
return vma;
}
+
+static inline
+int i915_get_vma_pages(struct i915_vma *vma)
+{
+ if (vma->ggtt_view.pages)
+ return 0;
+
+ if (vma->ggtt_view.type == I915_GGTT_VIEW_NORMAL)
+ vma->ggtt_view.pages = vma->obj->pages;
+ else
+ WARN_ONCE(1, "GGTT view %u not implemented!\n",
+ vma->ggtt_view.type);
+
+ if (!vma->ggtt_view.pages) {
+ DRM_ERROR("Failed to get pages for VMA view type %u!\n",
+ vma->ggtt_view.type);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/**
+ * i915_vma_bind - Sets up PTEs for an VMA in it's corresponding address space.
+ * @vma: VMA to map
+ * @cache_level: mapping cache level
+ * @flags: flags like global or local mapping
+ *
+ * DMA addresses are taken from the scatter-gather table of this object (or of
+ * this VMA in case of non-default GGTT views) and PTE entries set up.
+ * Note that DMA addresses are also the only part of the SG table we care about.
+ */
+int i915_vma_bind(struct i915_vma *vma, enum i915_cache_level cache_level,
+ u32 flags)
+{
+ int ret = i915_get_vma_pages(vma);
+
+ if (ret)
+ return ret;
+
+ vma->bind_vma(vma, cache_level, flags);
+
+ return 0;
+}
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