[PATCH 05/10] drm/i915/gtt: Determine the radices for gen8 page directories
Chris Wilson
chris at chris-wilson.co.uk
Sun Jul 7 08:44:49 UTC 2019
The radix levels of each page directory are easily determined so replace
the numerous hardcoded constants with precomputed derived constants.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 32 +++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 2fc60e8acd9a..5eb415b0fc17 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -868,6 +868,38 @@ static int gen8_ppgtt_notify_vgt(struct i915_ppgtt *ppgtt, bool create)
return 0;
}
+#define pd_lvl(lvl) ((lvl) * ilog2(I915_PDES))
+#define gen8_pd_shift(lvl) (GEN8_PTE_SHIFT + pd_lvl(lvl))
+#define gen8_pd_size(lvl) BIT_ULL(gen8_pd_shift(lvl))
+#define gen8_pd_index(a, l) i915_pde_index((a), gen8_pd_shift(l))
+
+static inline unsigned int
+gen8_pd_range(u64 addr, u64 end, int lvl, unsigned int *idx)
+{
+ const int shift = gen8_pd_shift(lvl);
+ const u64 mask = ~0ull << gen8_pd_shift(lvl + 1);
+
+ end += ~mask >> pd_lvl(1);
+
+ *idx = i915_pde_index(addr, shift);
+ if ((addr & mask) != (end & mask))
+ return I915_PDES - *idx;
+ else
+ return i915_pde_index(end, shift) - *idx;
+}
+
+static inline unsigned int gen8_pd_count(u64 addr, u64 end, int lvl)
+{
+ unsigned int dummy;
+
+ return gen8_pd_range(addr, end, lvl, &dummy);
+}
+
+static inline unsigned int gen8_pt_count(u64 addr, u64 end)
+{
+ return gen8_pd_count(addr, end, 0);
+}
+
static void gen8_free_page_tables(struct i915_address_space *vm,
struct i915_page_directory *pd)
{
--
2.20.1
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