drm/i915/gtt: Wrap page_table with page_directory

The page directory extends the page table with the shadow entries. Make
the page directory struct embed the page table for easier code reuse.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190712094327.24437-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
index a98652e..2873276 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
@@ -1512,7 +1512,7 @@ static int load_pd_dir(struct i915_request *rq, const struct i915_ppgtt *ppgtt)
 
        *cs++ = MI_LOAD_REGISTER_IMM(1);
        *cs++ = i915_mmio_reg_offset(RING_PP_DIR_BASE(engine->mmio_base));
-       *cs++ = ppgtt->pd->base.ggtt_offset << 10;
+       *cs++ = px_base(ppgtt->pd)->ggtt_offset << 10;
 
        intel_ring_advance(rq, cs);
 

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 1e6021e..b2aa441 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -107,6 +107,8 @@
  *
  */
 
+#define as_pd(x) container_of((x), typeof(struct i915_page_directory), pt)
+
 static int
 i915_get_ggtt_vma_pages(struct i915_vma *vma);
 
@@ -711,28 +713,17 @@ static struct i915_page_table *alloc_pt(struct i915_address_space *vm)
        return pt;
 }
 
-static void free_pt(struct i915_address_space *vm, struct i915_page_table *pt)
-{
-       cleanup_page_dma(vm, &pt->base);
-       kfree(pt);
-}
-
 static struct i915_page_directory *__alloc_pd(void)
 {
        struct i915_page_directory *pd;
 
        pd = kmalloc(sizeof(*pd), I915_GFP_ALLOW_FAIL);
-
        if (unlikely(!pd))
                return NULL;
 
-       memset(&pd->base, 0, sizeof(pd->base));
-       atomic_set(&pd->used, 0);
+       atomic_set(px_used(pd), 0);
        spin_lock_init(&pd->lock);
 
-       /* for safety */
-       pd->entry[0] = NULL;
-
        return pd;
 }
 
@@ -744,7 +735,7 @@ static struct i915_page_directory *alloc_pd(struct i915_address_space *vm)
        if (unlikely(!pd))
                return ERR_PTR(-ENOMEM);
 
-       if (unlikely(setup_page_dma(vm, &pd->base))) {
+       if (unlikely(setup_page_dma(vm, px_base(pd)))) {
                kfree(pd);
                return ERR_PTR(-ENOMEM);
        }
@@ -752,13 +743,14 @@ static struct i915_page_directory *alloc_pd(struct i915_address_space *vm)
        return pd;
 }
 
-static void free_pd(struct i915_address_space *vm,
-                   struct i915_page_directory *pd)
+static void free_pd(struct i915_address_space *vm, struct i915_page_dma *pd)
 {
-       cleanup_page_dma(vm, &pd->base);
+       cleanup_page_dma(vm, pd);
        kfree(pd);
 }
 
+#define free_px(vm, px) free_pd(vm, px_base(px))
+
 static void init_pd(struct i915_page_directory *pd,
                    struct i915_page_dma *scratch)
 {
@@ -783,9 +775,9 @@ __set_pd_entry(struct i915_page_directory * const pd,
               struct i915_page_dma * const to,
               u64 (*encode)(const dma_addr_t, const enum i915_cache_level))
 {
-       GEM_BUG_ON(atomic_read(&pd->used) > 512);
+       GEM_BUG_ON(atomic_read(px_used(pd)) > 512);
 
-       atomic_inc(&pd->used);
+       atomic_inc(px_used(pd));
        pd->entry[pde] = to;
        write_dma_entry(px_base(pd), pde, encode(to->daddr, I915_CACHE_LLC));
 }
@@ -796,11 +788,11 @@ __clear_pd_entry(struct i915_page_directory * const pd,
                 struct i915_page_dma * const to,
                 u64 (*encode)(const dma_addr_t, const enum i915_cache_level))
 {
-       GEM_BUG_ON(atomic_read(&pd->used) == 0);
+       GEM_BUG_ON(atomic_read(px_used(pd)) == 0);
 
        write_dma_entry(px_base(pd), pde, encode(to->daddr, I915_CACHE_LLC));
        pd->entry[pde] = to;
-       atomic_dec(&pd->used);
+       atomic_dec(px_used(pd));
 }
 
 #define set_pd_entry(pd, pde, to) \
@@ -812,13 +804,13 @@ __clear_pd_entry(struct i915_page_directory * const pd,
 static bool
 release_pd_entry(struct i915_page_directory * const pd,
                 const unsigned short pde,
-                atomic_t *counter,
+                struct i915_page_table * const pt,
                 struct i915_page_dma * const scratch)
 {
        bool free = false;
 
        spin_lock(&pd->lock);
-       if (atomic_dec_and_test(counter)) {
+       if (atomic_dec_and_test(&pt->used)) {
                clear_pd_entry(pd, pde, scratch);
                free = true;
        }
@@ -869,8 +861,8 @@ static void gen8_ppgtt_clear_pd(struct i915_address_space *vm,
 
                atomic_inc(&pt->used);
                gen8_ppgtt_clear_pt(vm, pt, start, length);
-               if (release_pd_entry(pd, pde, &pt->used, &vm->scratch_pt))
-                       free_pt(vm, pt);
+               if (release_pd_entry(pd, pde, pt, &vm->scratch_pt))
+                       free_px(vm, pt);
        }
 }
 
@@ -887,10 +879,10 @@ static void gen8_ppgtt_clear_pdp(struct i915_address_space *vm,
        gen8_for_each_pdpe(pd, pdp, start, length, pdpe) {
                GEM_BUG_ON(px_base(pd) == &vm->scratch_pd);
 
-               atomic_inc(&pd->used);
+               atomic_inc(px_used(pd));
                gen8_ppgtt_clear_pd(vm, pd, start, length);
-               if (release_pd_entry(pdp, pdpe, &pd->used, &vm->scratch_pd))
-                       free_pd(vm, pd);
+               if (release_pd_entry(pdp, pdpe, &pd->pt, &vm->scratch_pd))
+                       free_px(vm, pd);
        }
 }
 
@@ -917,10 +909,10 @@ static void gen8_ppgtt_clear_4lvl(struct i915_address_space *vm,
        gen8_for_each_pml4e(pdp, pml4, start, length, pml4e) {
                GEM_BUG_ON(px_base(pdp) == &vm->scratch_pdp);
 
-               atomic_inc(&pdp->used);
+               atomic_inc(px_used(pdp));
                gen8_ppgtt_clear_pdp(vm, pdp, start, length);
-               if (release_pd_entry(pml4, pml4e, &pdp->used, &vm->scratch_pdp))
-                       free_pd(vm, pdp);
+               if (release_pd_entry(pml4, pml4e, &pdp->pt, &vm->scratch_pdp))
+                       free_px(vm, pdp);
        }
 }
 
@@ -1175,7 +1167,7 @@ static void gen8_free_page_tables(struct i915_address_space *vm,
 
        for (i = 0; i < I915_PDES; i++) {
                if (pd->entry[i] != &vm->scratch_pt)
-                       free_pt(vm, pd->entry[i]);
+                       free_pd(vm, pd->entry[i]);
        }
 }
 
@@ -1253,9 +1245,9 @@ static int gen8_ppgtt_notify_vgt(struct i915_ppgtt *ppgtt, bool create)
        int i;
 
        if (create)
-               atomic_inc(&ppgtt->pd->used); /* never remove */
+               atomic_inc(px_used(ppgtt->pd)); /* never remove */
        else
-               atomic_dec(&ppgtt->pd->used);
+               atomic_dec(px_used(ppgtt->pd));
 
        if (i915_vm_is_4lvl(vm)) {
                const u64 daddr = px_dma(ppgtt->pd);
@@ -1296,7 +1288,7 @@ static void gen8_ppgtt_cleanup_3lvl(struct i915_address_space *vm,
                free_pd(vm, pdp->entry[i]);
        }
 
-       free_pd(vm, pdp);
+       free_px(vm, pdp);
 }
 
 static void gen8_ppgtt_cleanup_4lvl(struct i915_ppgtt *ppgtt)
@@ -1313,7 +1305,7 @@ static void gen8_ppgtt_cleanup_4lvl(struct i915_ppgtt *ppgtt)
                gen8_ppgtt_cleanup_3lvl(&ppgtt->vm, pdp);
        }
 
-       free_pd(&ppgtt->vm, pml4);
+       free_px(&ppgtt->vm, pml4);
 }
 
 static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
@@ -1377,7 +1369,7 @@ unwind:
        gen8_ppgtt_clear_pd(vm, pd, from, start - from);
 out:
        if (alloc)
-               free_pt(vm, alloc);
+               free_px(vm, alloc);
        return ret;
 }
 
@@ -1413,7 +1405,7 @@ static int gen8_ppgtt_alloc_pdp(struct i915_address_space *vm,
                                pd = pdp->entry[pdpe];
                        }
                }
-               atomic_inc(&pd->used);
+               atomic_inc(px_used(pd));
                spin_unlock(&pdp->lock);
 
                ret = gen8_ppgtt_alloc_pd(vm, pd, start, length);
@@ -1421,19 +1413,19 @@ static int gen8_ppgtt_alloc_pdp(struct i915_address_space *vm,
                        goto unwind_pd;
 
                spin_lock(&pdp->lock);
-               atomic_dec(&pd->used);
+               atomic_dec(px_used(pd));
        }
        spin_unlock(&pdp->lock);
        goto out;
 
 unwind_pd:
-       if (release_pd_entry(pdp, pdpe, &pd->used, &vm->scratch_pd))
-               free_pd(vm, pd);
+       if (release_pd_entry(pdp, pdpe, &pd->pt, &vm->scratch_pd))
+               free_px(vm, pd);
 unwind:
        gen8_ppgtt_clear_pdp(vm, pdp, from, start - from);
 out:
        if (alloc)
-               free_pd(vm, alloc);
+               free_px(vm, alloc);
        return ret;
 }
 
@@ -1477,7 +1469,7 @@ static int gen8_ppgtt_alloc_4lvl(struct i915_address_space *vm,
                                pdp = pml4->entry[pml4e];
                        }
                }
-               atomic_inc(&pdp->used);
+               atomic_inc(px_used(pdp));
                spin_unlock(&pml4->lock);
 
                ret = gen8_ppgtt_alloc_pdp(vm, pdp, start, length);
@@ -1485,19 +1477,19 @@ static int gen8_ppgtt_alloc_4lvl(struct i915_address_space *vm,
                        goto unwind_pdp;
 
                spin_lock(&pml4->lock);
-               atomic_dec(&pdp->used);
+               atomic_dec(px_used(pdp));
        }
        spin_unlock(&pml4->lock);
        goto out;
 
 unwind_pdp:
-       if (release_pd_entry(pml4, pml4e, &pdp->used, &vm->scratch_pdp))
-               free_pd(vm, pdp);
+       if (release_pd_entry(pml4, pml4e, &pdp->pt, &vm->scratch_pdp))
+               free_px(vm, pdp);
 unwind:
        gen8_ppgtt_clear_4lvl(vm, from, start - from);
 out:
        if (alloc)
-               free_pd(vm, alloc);
+               free_px(vm, alloc);
        return ret;
 }
 
@@ -1523,7 +1515,7 @@ static int gen8_preallocate_top_level_pdp(struct i915_ppgtt *ppgtt)
 
 unwind:
        gen8_ppgtt_clear_pdp(vm, pdp, from, start - from);
-       atomic_set(&pdp->used, 0);
+       atomic_set(px_used(pdp), 0);
        return -ENOMEM;
 }
 
@@ -1550,7 +1542,7 @@ static void init_pd_n(struct i915_address_space *vm,
                      const unsigned int entries)
 {
        const u64 daddr = gen8_pde_encode(to->daddr, I915_CACHE_LLC);
-       u64 * const vaddr = kmap_atomic(pd->base.page);
+       u64 * const vaddr = kmap_atomic_px(pd);
 
        memset64(vaddr, daddr, entries);
        kunmap_atomic(vaddr);
@@ -1578,7 +1570,7 @@ gen8_alloc_top_pd(struct i915_address_space *vm)
 
        pd->entry[GEN8_3LVL_PDPES] = NULL;
 
-       if (unlikely(setup_page_dma(vm, &pd->base))) {
+       if (unlikely(setup_page_dma(vm, px_base(pd)))) {
                kfree(pd);
                return ERR_PTR(-ENOMEM);
        }
@@ -1654,7 +1646,7 @@ static struct i915_ppgtt *gen8_ppgtt_create(struct drm_i915_private *i915)
        return ppgtt;
 
 err_free_pd:
-       free_pd(&ppgtt->vm, ppgtt->pd);
+       free_px(&ppgtt->vm, ppgtt->pd);
 err_free_scratch:
        free_scratch(&ppgtt->vm);
 err_free:
@@ -1865,7 +1857,7 @@ unwind_out:
        gen6_ppgtt_clear_range(vm, from, start - from);
 out:
        if (alloc)
-               free_pt(vm, alloc);
+               free_px(vm, alloc);
        intel_runtime_pm_put(&vm->i915->runtime_pm, wakeref);
        return ret;
 }
@@ -1906,7 +1898,7 @@ static void gen6_ppgtt_free_pd(struct gen6_ppgtt *ppgtt)
 
        gen6_for_all_pdes(pt, pd, pde)
                if (px_base(pt) != &ppgtt->base.vm.scratch_pt)
-                       free_pt(&ppgtt->base.vm, pt);
+                       free_px(&ppgtt->base.vm, pt);
 }
 
 static void gen6_ppgtt_cleanup(struct i915_address_space *vm)
@@ -1947,7 +1939,7 @@ static int pd_vma_bind(struct i915_vma *vma,
        struct i915_page_table *pt;
        unsigned int pde;
 
-       ppgtt->base.pd->base.ggtt_offset = ggtt_offset * sizeof(gen6_pte_t);
+       px_base(ppgtt->base.pd)->ggtt_offset = ggtt_offset * sizeof(gen6_pte_t);
        ppgtt->pd_addr = (gen6_pte_t __iomem *)ggtt->gsm + ggtt_offset;
 
        gen6_for_all_pdes(pt, ppgtt->base.pd, pde)
@@ -1975,7 +1967,7 @@ static void pd_vma_unbind(struct i915_vma *vma)
                if (px_base(pt) == scratch || atomic_read(&pt->used))
                        continue;
 
-               free_pt(&ppgtt->base.vm, pt);
+               free_px(&ppgtt->base.vm, pt);
                pd->entry[pde] = scratch;
        }
 

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index 91d8b4c..48bb8c5 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -246,8 +246,7 @@ struct i915_page_table {
 };
 
 struct i915_page_directory {
-       struct i915_page_dma base;
-       atomic_t used;
+       struct i915_page_table pt;
        spinlock_t lock;
        void *entry[512];
 };
@@ -262,10 +261,16 @@ struct i915_page_directory {
 #define px_base(px) \
        __px_choose_expr(px, struct i915_page_dma *, __x, \
        __px_choose_expr(px, struct i915_page_table *, &__x->base, \
-       __px_choose_expr(px, struct i915_page_directory *, &__x->base, \
+       __px_choose_expr(px, struct i915_page_directory *, &__x->pt.base, \
        (void)0)))
 #define px_dma(px) (px_base(px)->daddr)
 
+#define px_pt(px) \
+       __px_choose_expr(px, struct i915_page_table *, __x, \
+       __px_choose_expr(px, struct i915_page_directory *, &__x->pt, \
+       (void)0))
+#define px_used(px) (&px_pt(px)->used)
+
 struct i915_vma_ops {
        /* Map an object into an address space with the given cache flags. */
        int (*bind_vma)(struct i915_vma *vma,
@@ -600,10 +605,9 @@ static inline u64 gen8_pte_count(u64 address, u64 length)
 static inline dma_addr_t
 i915_page_dir_dma_addr(const struct i915_ppgtt *ppgtt, const unsigned int n)
 {
-       struct i915_page_directory *pd;
+       struct i915_page_dma *pt = ppgtt->pd->entry[n];
 
-       pd = i915_pdp_entry(ppgtt->pd, n);
-       return px_dma(pd);
+       return px_dma(pt);
 }
 
 static inline struct i915_ggtt *