Allocate all page directory variants with alloc_pd. As
the lvl3 and lvl4 variants differ in manipulation, we
need to check for existence of backing phys page before accessing
it.
Signed-off-by: Mika Kuoppala <mika.kuopp...@linux.intel.com>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 100 ++++++++++++----------------
1 file changed, 42 insertions(+), 58 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c
b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 73aaf9481dab..bbcf3be28e19 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -717,10 +717,17 @@ static struct i915_page_directory *alloc_pd(struct
i915_address_space *vm)
return pd;
}
+static inline bool pd_has_phys_page(const struct i915_page_directory * const
pd)
+{
+ return pd->base.page;
+}
+
static void free_pd(struct i915_address_space *vm,
struct i915_page_directory *pd)
{
- cleanup_px(vm, pd);
+ if (likely(pd_has_phys_page(pd)))
+ cleanup_px(vm, pd);
+
kfree(pd);
}
@@ -732,37 +739,12 @@ static void init_pd_with_page(struct i915_address_space
*vm,
memset_p(pd->entry, pt, 512);
}
-static struct i915_page_directory *alloc_pdp(struct i915_address_space *vm)
-{
- struct i915_page_directory *pdp;
-
- pdp = __alloc_pd(i915_pdpes_per_pdp(vm));
- if (!pdp)
- return ERR_PTR(-ENOMEM);
-
- if (i915_vm_is_4lvl(vm)) {
- if (unlikely(setup_px(vm, pdp))) {
- kfree(pdp);
- return ERR_PTR(-ENOMEM);
- }
- }
-
- return pdp;
-}
-
-static void free_pdp(struct i915_address_space *vm,
- struct i915_page_directory *pdp)
-{
- if (i915_vm_is_4lvl(vm))
- cleanup_px(vm, pdp);
-
- kfree(pdp);
-}
-
static void init_pd(struct i915_address_space *vm,
struct i915_page_directory * const pd,
struct i915_page_directory * const to)
{
+ GEM_DEBUG_BUG_ON(!pd_has_phys_page(pd));
+
fill_px(vm, pd, gen8_pdpe_encode(px_dma(to), I915_CACHE_LLC));
memset_p(pd->entry, to, 512);
}
@@ -840,14 +822,13 @@ static bool gen8_ppgtt_clear_pd(struct i915_address_space
*vm,
return !atomic_read(&pd->used);
}
-static void gen8_ppgtt_set_pdpe(struct i915_address_space *vm,
- struct i915_page_directory *pdp,
+static void gen8_ppgtt_set_pdpe(struct i915_page_directory *pdp,
struct i915_page_directory *pd,
unsigned int pdpe)
{
gen8_ppgtt_pdpe_t *vaddr;
- if (!i915_vm_is_4lvl(vm))
+ if (!pd_has_phys_page(pdp))
return;
vaddr = kmap_atomic_px(pdp);
@@ -875,7 +856,7 @@ static bool gen8_ppgtt_clear_pdp(struct i915_address_space
*vm,
spin_lock(&pdp->lock);
if (!atomic_read(&pd->used)) {
- gen8_ppgtt_set_pdpe(vm, pdp, vm->scratch_pd, pdpe);
+ gen8_ppgtt_set_pdpe(pdp, vm->scratch_pd, pdpe);
pdp->entry[pdpe] = vm->scratch_pd;
GEM_BUG_ON(!atomic_read(&pdp->used));
@@ -936,7 +917,7 @@ static void gen8_ppgtt_clear_4lvl(struct i915_address_space
*vm,
}
spin_unlock(&pml4->lock);
if (free)
- free_pdp(vm, pdp);
+ free_pd(vm, pdp);
}
}
@@ -1240,7 +1221,7 @@ static int gen8_init_scratch(struct i915_address_space
*vm)
}
if (i915_vm_is_4lvl(vm)) {
- vm->scratch_pdp = alloc_pdp(vm);
+ vm->scratch_pdp = alloc_pd(vm);
if (IS_ERR(vm->scratch_pdp)) {
ret = PTR_ERR(vm->scratch_pdp);
goto free_pd;
@@ -1302,7 +1283,7 @@ static void gen8_free_scratch(struct i915_address_space
*vm)
return;
if (i915_vm_is_4lvl(vm))
- free_pdp(vm, vm->scratch_pdp);
+ free_pd(vm, vm->scratch_pdp);
free_pd(vm, vm->scratch_pd);
free_pt(vm, vm->scratch_pt);
cleanup_scratch_page(vm);
@@ -1322,7 +1303,7 @@ static void gen8_ppgtt_cleanup_3lvl(struct
i915_address_space *vm,
free_pd(vm, pdp->entry[i]);
}
- free_pdp(vm, pdp);
+ free_pd(vm, pdp);
}
static void gen8_ppgtt_cleanup_4lvl(struct i915_ppgtt *ppgtt)
@@ -1429,7 +1410,7 @@ static int gen8_ppgtt_alloc_pdp(struct i915_address_space
*vm,
old = cmpxchg(&pdp->entry[pdpe], vm->scratch_pd, pd);
if (old == vm->scratch_pd) {
- gen8_ppgtt_set_pdpe(vm, pdp, pd, pdpe);
+ gen8_ppgtt_set_pdpe(pdp, pd, pdpe);
atomic_inc(&pdp->used);
} else {
free_pd(vm, pd);
@@ -1455,7 +1436,7 @@ static int gen8_ppgtt_alloc_pdp(struct i915_address_space
*vm,
unwind_pd:
spin_lock(&pdp->lock);
if (atomic_dec_and_test(&pd->used)) {
- gen8_ppgtt_set_pdpe(vm, pdp, vm->scratch_pd, pdpe);
+ gen8_ppgtt_set_pdpe(pdp, vm->scratch_pd, pdpe);
GEM_BUG_ON(!atomic_read(&pdp->used));
atomic_dec(&pdp->used);
free_pd(vm, pd);
@@ -1485,13 +1466,12 @@ static int gen8_ppgtt_alloc_4lvl(struct
i915_address_space *vm,
spin_lock(&pml4->lock);
gen8_for_each_pml4e(pdp, pml4, start, length, pml4e) {
-
if (pdp == vm->scratch_pdp) {
struct i915_page_directory *old;
spin_unlock(&pml4->lock);
- pdp = alloc_pdp(vm);
+ pdp = alloc_pd(vm);
if (IS_ERR(pdp))
goto unwind;
@@ -1501,7 +1481,7 @@ static int gen8_ppgtt_alloc_4lvl(struct
i915_address_space *vm,
if (old == vm->scratch_pdp) {
gen8_ppgtt_set_pml4e(pml4, pdp, pml4e);
} else {
- free_pdp(vm, pdp);
+ free_pd(vm, pdp);
pdp = old;
}
@@ -1525,7 +1505,7 @@ static int gen8_ppgtt_alloc_4lvl(struct
i915_address_space *vm,
spin_lock(&pml4->lock);
if (atomic_dec_and_test(&pdp->used)) {
gen8_ppgtt_set_pml4e(pml4, vm->scratch_pdp, pml4e);
- free_pdp(vm, pdp);
+ free_pd(vm, pdp);
}
spin_unlock(&pml4->lock);
unwind:
@@ -1548,7 +1528,7 @@ static int gen8_preallocate_top_level_pdp(struct
i915_ppgtt *ppgtt)
goto unwind;
init_pd_with_page(vm, pd, vm->scratch_pt);
- gen8_ppgtt_set_pdpe(vm, pdp, pd, pdpe);
+ gen8_ppgtt_set_pdpe(pdp, pd, pdpe);
atomic_inc(&pdp->used);
}
@@ -1560,7 +1540,7 @@ static int gen8_preallocate_top_level_pdp(struct
i915_ppgtt *ppgtt)
unwind:
start -= from;
gen8_for_each_pdpe(pd, pdp, from, start, pdpe) {
- gen8_ppgtt_set_pdpe(vm, pdp, vm->scratch_pd, pdpe);
+ gen8_ppgtt_set_pdpe(pdp, vm->scratch_pd, pdpe);
free_pd(vm, pd);
}
atomic_set(&pdp->used, 0);
@@ -1592,7 +1572,7 @@ static void ppgtt_init(struct drm_i915_private *i915,
static struct i915_ppgtt *gen8_ppgtt_create(struct drm_i915_private *i915)
{
struct i915_ppgtt *ppgtt;
- int err;
+ int ret;
ppgtt = kzalloc(sizeof(*ppgtt), GFP_KERNEL);
if (!ppgtt)
@@ -1614,17 +1594,21 @@ static struct i915_ppgtt *gen8_ppgtt_create(struct
drm_i915_private *i915)
if (IS_CHERRYVIEW(i915) || IS_BROXTON(i915))
ppgtt->vm.pt_kmap_wc = true;
- err = gen8_init_scratch(&ppgtt->vm);
- if (err)
+ ret = gen8_init_scratch(&ppgtt->vm);
+ if (ret)
goto err_free;
- ppgtt->pd = alloc_pdp(&ppgtt->vm);
- if (IS_ERR(ppgtt->pd)) {
- err = PTR_ERR(ppgtt->pd);
- goto err_scratch;
+ ppgtt->pd = __alloc_pd(i915_pdpes_per_pdp(&ppgtt->vm));
+ if (!ppgtt->pd) {
+ ret = -ENOMEM;
+ goto err_free_scratch;
}
if (i915_vm_is_4lvl(&ppgtt->vm)) {
+ ret = setup_px(&ppgtt->vm, ppgtt->pd);
+ if (ret)
+ goto err_free_pdp;
+
init_pd(&ppgtt->vm, ppgtt->pd, ppgtt->vm.scratch_pdp);
ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc_4lvl;
@@ -1639,9 +1623,9 @@ static struct i915_ppgtt *gen8_ppgtt_create(struct
drm_i915_private *i915)
GEN8_3LVL_PDPES);
if (intel_vgpu_active(i915)) {
- err = gen8_preallocate_top_level_pdp(ppgtt);
- if (err)
- goto err_pdp;
+ ret = gen8_preallocate_top_level_pdp(ppgtt);
+ if (ret)
+ goto err_free_pdp;
}
ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc_3lvl;
@@ -1656,13 +1640,13 @@ static struct i915_ppgtt *gen8_ppgtt_create(struct
drm_i915_private *i915)
return ppgtt;
-err_pdp:
- free_pdp(&ppgtt->vm, ppgtt->pd);
-err_scratch:
+err_free_pdp:
+ free_pd(&ppgtt->vm, ppgtt->pd);
+err_free_scratch:
gen8_free_scratch(&ppgtt->vm);
err_free:
kfree(ppgtt);
- return ERR_PTR(err);
+ return ERR_PTR(ret);
}
/* Write pde (index) from the page directory @pd to the page table @pt */
--
2.17.1
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