[Intel-gfx] [RFC 30/38] drm/i915/bdw: pagedirs rework allocation

[Michel Thierry]

From: Ben Widawsky <benjamin.widawsky at intel.com>

Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
Signed-off-by: Michel Thierry <michel.thierry at intel.com>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 43 ++++++++++++++++++++++++++-----------
 1 file changed, 31 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 8c3bb45..6f9c79b 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -537,8 +537,10 @@ static void gen8_teardown_va_range(struct i915_address_space *vm,
 		uint64_t pd_start = start;
 		gen8_for_each_pde(pt, pd, pd_start, pd_len, temp, pde) {
 			free_pt_single(pt, vm->dev);
+			pd->page_tables[pde] = NULL;
 		}
 		free_pd_single(pd, vm->dev);
+		ppgtt->pdp.pagedirs[pdpe] = NULL;
 	}
 }
 
@@ -587,26 +589,40 @@ unwind_out:
 	return -ENOMEM;
 }
 
-static int gen8_ppgtt_allocate_page_directories(struct i915_hw_ppgtt *ppgtt,
-						const int max_pdp)
+static int gen8_ppgtt_alloc_pagedirs(struct i915_pagedirpo *pdp,
+				     uint64_t start,
+				     uint64_t length)
 {
-	int i;
+	struct i915_hw_ppgtt *ppgtt =
+		container_of(pdp, struct i915_hw_ppgtt, pdp);
+	struct i915_pagedir *unused;
+	uint64_t temp;
+	uint32_t pdpe;
 
-	for (i = 0; i < max_pdp; i++) {
-		ppgtt->pdp.pagedirs[i] = alloc_pd_single(ppgtt->base.dev);
-		if (IS_ERR(ppgtt->pdp.pagedirs[i]))
+	/* FIXME: PPGTT container_of won't work for 64b */
+	BUG_ON((start + length) > 0x800000000ULL);
+
+	gen8_for_each_pdpe(unused, pdp, start, length, temp, pdpe) {
+		BUG_ON(unused);
+		pdp->pagedirs[pdpe] = alloc_pd_single(ppgtt->base.dev);
+		if (IS_ERR(ppgtt->pdp.pagedirs[pdpe]))
 			goto unwind_out;
+
+		ppgtt->num_pd_pages++;
 	}
 
-	ppgtt->num_pd_pages = max_pdp;
 	BUG_ON(ppgtt->num_pd_pages > GEN8_LEGACY_PDPES);
 
 	return 0;
 
 unwind_out:
-	while (i--)
-		free_pd_single(ppgtt->pdp.pagedirs[i],
+	while (pdpe--) {
+		free_pd_single(ppgtt->pdp.pagedirs[pdpe],
 			       ppgtt->base.dev);
+		ppgtt->num_pd_pages--;
+	}
+
+	WARN_ON(ppgtt->num_pd_pages);
 
 	return -ENOMEM;
 }
@@ -616,7 +632,8 @@ static int gen8_ppgtt_alloc(struct i915_hw_ppgtt *ppgtt,
 {
 	int ret;
 
-	ret = gen8_ppgtt_allocate_page_directories(ppgtt, max_pdp);
+	ret = gen8_ppgtt_alloc_pagedirs(&ppgtt->pdp, ppgtt->base.start,
+					ppgtt->base.total);
 	if (ret)
 		return ret;
 
@@ -653,6 +670,10 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt, uint64_t size)
 	if (size % (1<<30))
 		DRM_INFO("Pages will be wasted unless GTT size (%llu) is divisible by 1GB\n", size);
 
+	ppgtt->base.start = 0;
+	ppgtt->base.total = size;
+	BUG_ON(ppgtt->base.total == 0);
+
 	/* 1. Do all our allocations for page directories and page tables. */
 	ret = gen8_ppgtt_alloc(ppgtt, max_pdp);
 	if (ret)
@@ -685,8 +706,6 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt, uint64_t size)
 	ppgtt->base.clear_range = gen8_ppgtt_clear_range;
 	ppgtt->base.insert_entries = gen8_ppgtt_insert_entries;
 	ppgtt->base.cleanup = gen8_ppgtt_cleanup;
-	ppgtt->base.start = 0;
-	ppgtt->base.total = ppgtt->num_pd_entries * GEN8_PTES_PER_PT * PAGE_SIZE;
 
 	DRM_DEBUG_DRIVER("Allocated %d pages for page directories (%d wasted)\n",
 			 ppgtt->num_pd_pages, ppgtt->num_pd_pages - max_pdp);
-- 
2.0.3