On Tue, Feb 25, 2014 at 06:13:44PM -0800, Ben Widawsky wrote:
> This patch converts insert_entries and clear_range, both functions which
> are specific to the VM. These functions tend to encapsulate the gen
> specific PTE writes. Passing absolute addresses to the insert_entries,
> and clear_range will help make the logic clearer within the functions as
> to what's going on. Currently, all callers simply do the appropriate
> page shift, which IMO, ends up looking weird with an upcoming change for
> the gen8 page table allocations.
>
> Up until now, the PPGTT was a funky 2 level page table. GEN8 changes
> this to look more like a 3 level page table, and to that extent we need
> a significant amount more memory simply for the page tables. To address
> this, the allocations will be split up in finer amounts.
>
> v2: Replace size_t with uint64_t (Chris, Imre)
>
> v3: Fix size in gen8_ppgtt_init (Ben)
> Fix Size in i915_gem_suspend_gtt_mappings/restore (Imre)
>
> v4: Wherever length was introduced in the API, the num_entries
> calculation should have been (length - start) as opposed to just length.
> As this is only a bug on clearing entries, it wasn't easily apparent.
> (Ben)
>
> Reviewed-by: Imre Deak <imre.deak@xxxxxxxxx>
> Signed-off-by: Ben Widawsky <ben@xxxxxxxxxxxx>
Give me a sec on this one.... something is still busted.
> ---
> drivers/gpu/drm/i915/i915_drv.h | 6 +--
> drivers/gpu/drm/i915/i915_gem_gtt.c | 90 +++++++++++++++++++++----------------
> 2 files changed, 54 insertions(+), 42 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 57556fb..ab23bfd 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -652,12 +652,12 @@ struct i915_address_space {
> enum i915_cache_level level,
> bool valid); /* Create a valid PTE */
> void (*clear_range)(struct i915_address_space *vm,
> - unsigned int first_entry,
> - unsigned int num_entries,
> + uint64_t start,
> + uint64_t length,
> bool use_scratch);
> void (*insert_entries)(struct i915_address_space *vm,
> struct sg_table *st,
> - unsigned int first_entry,
> + uint64_t start,
> enum i915_cache_level cache_level);
> void (*cleanup)(struct i915_address_space *vm);
> };
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index beca571..23e722b 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -254,13 +254,15 @@ static int gen8_mm_switch(struct i915_hw_ppgtt *ppgtt,
> }
>
> static void gen8_ppgtt_clear_range(struct i915_address_space *vm,
> - unsigned first_entry,
> - unsigned num_entries,
> + uint64_t start,
> + uint64_t length,
> bool use_scratch)
> {
> struct i915_hw_ppgtt *ppgtt =
> container_of(vm, struct i915_hw_ppgtt, base);
> gen8_gtt_pte_t *pt_vaddr, scratch_pte;
> + unsigned first_entry = start >> PAGE_SHIFT;
> + unsigned num_entries = (length - start) >> PAGE_SHIFT;
> unsigned act_pt = first_entry / GEN8_PTES_PER_PAGE;
> unsigned first_pte = first_entry % GEN8_PTES_PER_PAGE;
> unsigned last_pte, i;
> @@ -290,12 +292,13 @@ static void gen8_ppgtt_clear_range(struct i915_address_space *vm,
>
> static void gen8_ppgtt_insert_entries(struct i915_address_space *vm,
> struct sg_table *pages,
> - unsigned first_entry,
> + uint64_t start,
> enum i915_cache_level cache_level)
> {
> struct i915_hw_ppgtt *ppgtt =
> container_of(vm, struct i915_hw_ppgtt, base);
> gen8_gtt_pte_t *pt_vaddr;
> + unsigned first_entry = start >> PAGE_SHIFT;
> unsigned act_pt = first_entry / GEN8_PTES_PER_PAGE;
> unsigned act_pte = first_entry % GEN8_PTES_PER_PAGE;
> struct sg_page_iter sg_iter;
> @@ -539,7 +542,7 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt, uint64_t size)
> ppgtt->base.total = ppgtt->num_pt_pages * GEN8_PTES_PER_PAGE * PAGE_SIZE;
>
> ppgtt->base.clear_range(&ppgtt->base, 0,
> - ppgtt->num_pd_entries * GEN8_PTES_PER_PAGE,
> + ppgtt->num_pd_entries * GEN8_PTES_PER_PAGE * PAGE_SIZE,
> true);
>
> DRM_DEBUG_DRIVER("Allocated %d pages for page directories (%d wasted)\n",
> @@ -854,13 +857,15 @@ static int gen6_ppgtt_enable(struct i915_hw_ppgtt *ppgtt)
>
> /* PPGTT support for Sandybdrige/Gen6 and later */
> static void gen6_ppgtt_clear_range(struct i915_address_space *vm,
> - unsigned first_entry,
> - unsigned num_entries,
> + uint64_t start,
> + uint64_t length,
> bool use_scratch)
> {
> struct i915_hw_ppgtt *ppgtt =
> container_of(vm, struct i915_hw_ppgtt, base);
> gen6_gtt_pte_t *pt_vaddr, scratch_pte;
> + unsigned first_entry = start >> PAGE_SHIFT;
> + unsigned num_entries = (length - start) >> PAGE_SHIFT;
> unsigned act_pt = first_entry / I915_PPGTT_PT_ENTRIES;
> unsigned first_pte = first_entry % I915_PPGTT_PT_ENTRIES;
> unsigned last_pte, i;
> @@ -887,12 +892,13 @@ static void gen6_ppgtt_clear_range(struct i915_address_space *vm,
>
> static void gen6_ppgtt_insert_entries(struct i915_address_space *vm,
> struct sg_table *pages,
> - unsigned first_entry,
> + uint64_t start,
> enum i915_cache_level cache_level)
> {
> struct i915_hw_ppgtt *ppgtt =
> container_of(vm, struct i915_hw_ppgtt, base);
> gen6_gtt_pte_t *pt_vaddr;
> + unsigned first_entry = start >> PAGE_SHIFT;
> unsigned act_pt = first_entry / I915_PPGTT_PT_ENTRIES;
> unsigned act_pte = first_entry % I915_PPGTT_PT_ENTRIES;
> struct sg_page_iter sg_iter;
> @@ -1024,8 +1030,7 @@ alloc:
> ppgtt->pt_dma_addr[i] = pt_addr;
> }
>
> - ppgtt->base.clear_range(&ppgtt->base, 0,
> - ppgtt->num_pd_entries * I915_PPGTT_PT_ENTRIES, true);
> + ppgtt->base.clear_range(&ppgtt->base, 0, ppgtt->base.total, true);
> ppgtt->debug_dump = gen6_dump_ppgtt;
>
> DRM_DEBUG_DRIVER("Allocated pde space (%ldM) at GTT entry: %lx\n",
> @@ -1089,20 +1094,17 @@ ppgtt_bind_vma(struct i915_vma *vma,
> enum i915_cache_level cache_level,
> u32 flags)
> {
> - const unsigned long entry = vma->node.start >> PAGE_SHIFT;
> -
> WARN_ON(flags);
>
> - vma->vm->insert_entries(vma->vm, vma->obj->pages, entry, cache_level);
> + vma->vm->insert_entries(vma->vm, vma->obj->pages, vma->node.start,
> + cache_level);
> }
>
> static void ppgtt_unbind_vma(struct i915_vma *vma)
> {
> - const unsigned long entry = vma->node.start >> PAGE_SHIFT;
> -
> vma->vm->clear_range(vma->vm,
> - entry,
> - vma->obj->base.size >> PAGE_SHIFT,
> + vma->node.start,
> + vma->obj->base.size,
> true);
> }
>
> @@ -1186,8 +1188,8 @@ void i915_gem_suspend_gtt_mappings(struct drm_device *dev)
> i915_check_and_clear_faults(dev);
>
> dev_priv->gtt.base.clear_range(&dev_priv->gtt.base,
> - dev_priv->gtt.base.start / PAGE_SIZE,
> - dev_priv->gtt.base.total / PAGE_SIZE,
> + dev_priv->gtt.base.start,
> + dev_priv->gtt.base.total,
> false);
> }
>
> @@ -1201,8 +1203,8 @@ void i915_gem_restore_gtt_mappings(struct drm_device *dev)
>
> /* First fill our portion of the GTT with scratch pages */
> dev_priv->gtt.base.clear_range(&dev_priv->gtt.base,
> - dev_priv->gtt.base.start / PAGE_SIZE,
> - dev_priv->gtt.base.total / PAGE_SIZE,
> + dev_priv->gtt.base.start,
> + dev_priv->gtt.base.total,
> true);
>
> list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) {
> @@ -1263,10 +1265,11 @@ static inline void gen8_set_pte(void __iomem *addr, gen8_gtt_pte_t pte)
>
> static void gen8_ggtt_insert_entries(struct i915_address_space *vm,
> struct sg_table *st,
> - unsigned int first_entry,
> + uint64_t start,
> enum i915_cache_level level)
> {
> struct drm_i915_private *dev_priv = vm->dev->dev_private;
> + unsigned first_entry = start >> PAGE_SHIFT;
> gen8_gtt_pte_t __iomem *gtt_entries =
> (gen8_gtt_pte_t __iomem *)dev_priv->gtt.gsm + first_entry;
> int i = 0;
> @@ -1308,10 +1311,11 @@ static void gen8_ggtt_insert_entries(struct i915_address_space *vm,
> */
> static void gen6_ggtt_insert_entries(struct i915_address_space *vm,
> struct sg_table *st,
> - unsigned int first_entry,
> + uint64_t start,
> enum i915_cache_level level)
> {
> struct drm_i915_private *dev_priv = vm->dev->dev_private;
> + unsigned first_entry = start >> PAGE_SHIFT;
> gen6_gtt_pte_t __iomem *gtt_entries =
> (gen6_gtt_pte_t __iomem *)dev_priv->gtt.gsm + first_entry;
> int i = 0;
> @@ -1343,11 +1347,13 @@ static void gen6_ggtt_insert_entries(struct i915_address_space *vm,
> }
>
> static void gen8_ggtt_clear_range(struct i915_address_space *vm,
> - unsigned int first_entry,
> - unsigned int num_entries,
> + uint64_t start,
> + uint64_t length,
> bool use_scratch)
> {
> struct drm_i915_private *dev_priv = vm->dev->dev_private;
> + unsigned first_entry = start >> PAGE_SHIFT;
> + unsigned num_entries = (length - start) >> PAGE_SHIFT;
> gen8_gtt_pte_t scratch_pte, __iomem *gtt_base =
> (gen8_gtt_pte_t __iomem *) dev_priv->gtt.gsm + first_entry;
> const int max_entries = gtt_total_entries(dev_priv->gtt) - first_entry;
> @@ -1367,11 +1373,13 @@ static void gen8_ggtt_clear_range(struct i915_address_space *vm,
> }
>
> static void gen6_ggtt_clear_range(struct i915_address_space *vm,
> - unsigned int first_entry,
> - unsigned int num_entries,
> + uint64_t start,
> + uint64_t length,
> bool use_scratch)
> {
> struct drm_i915_private *dev_priv = vm->dev->dev_private;
> + unsigned first_entry = start >> PAGE_SHIFT;
> + unsigned num_entries = (length - start) >> PAGE_SHIFT;
> gen6_gtt_pte_t scratch_pte, __iomem *gtt_base =
> (gen6_gtt_pte_t __iomem *) dev_priv->gtt.gsm + first_entry;
> const int max_entries = gtt_total_entries(dev_priv->gtt) - first_entry;
> @@ -1404,10 +1412,12 @@ static void i915_ggtt_bind_vma(struct i915_vma *vma,
> }
>
> static void i915_ggtt_clear_range(struct i915_address_space *vm,
> - unsigned int first_entry,
> - unsigned int num_entries,
> + uint64_t start,
> + uint64_t length,
> bool unused)
> {
> + unsigned first_entry = start >> PAGE_SHIFT;
> + unsigned num_entries = (length - start) >> PAGE_SHIFT;
> intel_gtt_clear_range(first_entry, num_entries);
> }
>
> @@ -1428,7 +1438,6 @@ static void ggtt_bind_vma(struct i915_vma *vma,
> struct drm_device *dev = vma->vm->dev;
> struct drm_i915_private *dev_priv = dev->dev_private;
> struct drm_i915_gem_object *obj = vma->obj;
> - const unsigned long entry = vma->node.start >> PAGE_SHIFT;
>
> /* If there is no aliasing PPGTT, or the caller needs a global mapping,
> * or we have a global mapping already but the cacheability flags have
> @@ -1444,7 +1453,8 @@ static void ggtt_bind_vma(struct i915_vma *vma,
> if (!dev_priv->mm.aliasing_ppgtt || flags & GLOBAL_BIND) {
> if (!obj->has_global_gtt_mapping ||
> (cache_level != obj->cache_level)) {
> - vma->vm->insert_entries(vma->vm, obj->pages, entry,
> + vma->vm->insert_entries(vma->vm, obj->pages,
> + vma->node.start,
> cache_level);
> obj->has_global_gtt_mapping = 1;
> }
> @@ -1455,7 +1465,9 @@ static void ggtt_bind_vma(struct i915_vma *vma,
> (cache_level != obj->cache_level))) {
> struct i915_hw_ppgtt *appgtt = dev_priv->mm.aliasing_ppgtt;
> appgtt->base.insert_entries(&appgtt->base,
> - vma->obj->pages, entry, cache_level);
> + vma->obj->pages,
> + vma->node.start,
> + cache_level);
> vma->obj->has_aliasing_ppgtt_mapping = 1;
> }
> }
> @@ -1465,11 +1477,11 @@ static void ggtt_unbind_vma(struct i915_vma *vma)
> struct drm_device *dev = vma->vm->dev;
> struct drm_i915_private *dev_priv = dev->dev_private;
> struct drm_i915_gem_object *obj = vma->obj;
> - const unsigned long entry = vma->node.start >> PAGE_SHIFT;
>
> if (obj->has_global_gtt_mapping) {
> - vma->vm->clear_range(vma->vm, entry,
> - vma->obj->base.size >> PAGE_SHIFT,
> + vma->vm->clear_range(vma->vm,
> + vma->node.start,
> + obj->base.size,
> true);
> obj->has_global_gtt_mapping = 0;
> }
> @@ -1477,8 +1489,8 @@ static void ggtt_unbind_vma(struct i915_vma *vma)
> if (obj->has_aliasing_ppgtt_mapping) {
> struct i915_hw_ppgtt *appgtt = dev_priv->mm.aliasing_ppgtt;
> appgtt->base.clear_range(&appgtt->base,
> - entry,
> - obj->base.size >> PAGE_SHIFT,
> + vma->node.start,
> + obj->base.size,
> true);
> obj->has_aliasing_ppgtt_mapping = 0;
> }
> @@ -1563,14 +1575,14 @@ void i915_gem_setup_global_gtt(struct drm_device *dev,
>
> /* Clear any non-preallocated blocks */
> drm_mm_for_each_hole(entry, &ggtt_vm->mm, hole_start, hole_end) {
> - const unsigned long count = (hole_end - hole_start) / PAGE_SIZE;
> DRM_DEBUG_KMS("clearing unused GTT space: [%lx, %lx]\n",
> hole_start, hole_end);
> - ggtt_vm->clear_range(ggtt_vm, hole_start / PAGE_SIZE, count, true);
> + ggtt_vm->clear_range(ggtt_vm, hole_start,
> + hole_end - hole_start, true);
> }
>
> /* And finally clear the reserved guard page */
> - ggtt_vm->clear_range(ggtt_vm, end / PAGE_SIZE - 1, 1, true);
> + ggtt_vm->clear_range(ggtt_vm, end - PAGE_SIZE, PAGE_SIZE, true);
> }
>
> void i915_gem_init_global_gtt(struct drm_device *dev)
> --
> 1.9.0
>
--
Ben Widawsky, Intel Open Source Technology Center
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