[Intel-gfx] [PATCH 50/68] drm/i915: num_pd_pages/num_pd_entries isn't useful
Ben Widawsky
benjamin.widawsky at intel.com
Fri Aug 22 05:12:13 CEST 2014
These values are never quite useful for dynamic allocations of the page
tables. Getting rid of them will help prevent later confusion.
TODO: this probably needs to be earlier in the series
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
drivers/gpu/drm/i915/i915_debugfs.c | 11 ++++-----
drivers/gpu/drm/i915/i915_gem_gtt.c | 45 ++++++++++---------------------------
drivers/gpu/drm/i915/i915_gem_gtt.h | 7 ++++--
3 files changed, 21 insertions(+), 42 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 47baf50..09a64e6 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1813,13 +1813,12 @@ static int i915_swizzle_info(struct seq_file *m, void *data)
static size_t gen6_ppgtt_count_pt_pages(struct i915_hw_ppgtt *ppgtt)
{
- struct i915_pagedir *pd = &ppgtt->pd;
- struct i915_pagetab **pt = &pd->page_tables[0];
+ struct i915_pagetab *pt;
size_t cnt = 0;
- int i;
+ uint32_t useless;
- for (i = 0; i < ppgtt->num_pd_entries; i++) {
- if (pt[i] != ppgtt->scratch_pt)
+ gen6_for_all_pdes(pt, ppgtt, useless) {
+ if (pt != ppgtt->scratch_pt)
cnt++;
}
@@ -1842,8 +1841,6 @@ static void gen8_ppgtt_info(struct seq_file *m, struct drm_device *dev, int verb
if (!ppgtt)
return;
- seq_printf(m, "Page directories: %d\n", ppgtt->num_pd_pages);
- seq_printf(m, "Page tables: %d\n", ppgtt->num_pd_entries);
for_each_ring(ring, dev_priv, unused) {
seq_printf(m, "%s\n", ring->name);
for (i = 0; i < 4; i++) {
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 5875071..d8e0a62 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -609,22 +609,14 @@ static int gen8_ppgtt_alloc_pagedirs(struct i915_pagedirpo *pdp,
pdp->pagedirs[pdpe] = alloc_pd_single(ppgtt->base.dev);
if (IS_ERR(ppgtt->pdp.pagedirs[pdpe]))
goto unwind_out;
-
- ppgtt->num_pd_pages++;
}
- BUG_ON(ppgtt->num_pd_pages > GEN8_LEGACY_PDPES);
-
return 0;
unwind_out:
- while (pdpe--) {
+ while (pdpe--)
free_pd_single(ppgtt->pdp.pagedirs[pdpe],
ppgtt->base.dev);
- ppgtt->num_pd_pages--;
- }
-
- WARN_ON(ppgtt->num_pd_pages);
return -ENOMEM;
}
@@ -647,12 +639,8 @@ static int gen8_ppgtt_alloc(struct i915_hw_ppgtt *ppgtt,
ppgtt->base.dev);
if (ret)
goto err_out;
-
- ppgtt->num_pd_entries += I915_PDES_PER_PD;
}
- BUG_ON(pdpe > ppgtt->num_pd_pages);
-
return 0;
/* TODO: Check this for all cases */
@@ -674,7 +662,6 @@ err_out:
static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt, uint64_t size)
{
const int max_pdp = DIV_ROUND_UP(size, 1 << 30);
- const int min_pt_pages = I915_PDES_PER_PD * max_pdp;
int i, j, ret;
if (size % (1<<30))
@@ -723,27 +710,21 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt, uint64_t size)
ppgtt->base.insert_entries = gen8_ppgtt_insert_entries;
ppgtt->base.cleanup = gen8_ppgtt_cleanup;
- DRM_DEBUG_DRIVER("Allocated %d pages for page directories (%d wasted)\n",
- ppgtt->num_pd_pages, ppgtt->num_pd_pages - max_pdp);
- DRM_DEBUG_DRIVER("Allocated %d pages for page tables (%lld wasted)\n",
- ppgtt->num_pd_entries,
- (ppgtt->num_pd_entries - min_pt_pages) + size % (1<<30));
return 0;
}
static void gen6_dump_ppgtt(struct i915_hw_ppgtt *ppgtt, struct seq_file *m)
{
struct i915_address_space *vm = &ppgtt->base;
+ struct i915_pagetab *unused;
gen6_gtt_pte_t scratch_pte;
uint32_t pd_entry;
- int pte, pde;
+ uint32_t pte, pde, temp;
+ uint32_t start = ppgtt->base.start, length = ppgtt->base.total;
scratch_pte = vm->pte_encode(vm->scratch.addr, I915_CACHE_LLC, true, 0);
- seq_printf(m, " VM %p (pd_offset %x-%x):\n", vm,
- ppgtt->pd.pd_offset,
- ppgtt->pd.pd_offset + ppgtt->num_pd_entries);
- for (pde = 0; pde < ppgtt->num_pd_entries; pde++) {
+ gen6_for_each_pde(unused, &ppgtt->pd, start, length, temp, pde) {
u32 expected;
gen6_gtt_pte_t *pt_vaddr;
dma_addr_t pt_addr = ppgtt->pd.page_tables[pde]->daddr;
@@ -1221,12 +1202,12 @@ static void gen6_teardown_va_range(struct i915_address_space *vm,
static void gen6_ppgtt_free(struct i915_hw_ppgtt *ppgtt)
{
- int i;
+ struct i915_pagetab *pt;
+ uint32_t pde;
- for (i = 0; i < ppgtt->num_pd_entries; i++) {
- struct i915_pagetab *pt = ppgtt->pd.page_tables[i];
+ gen6_for_all_pdes(pt, ppgtt, pde) {
if (pt != ppgtt->scratch_pt)
- free_pt_single(ppgtt->pd.page_tables[i], ppgtt->base.dev);
+ free_pt_single(pt, ppgtt->base.dev);
}
/* Consider putting this as part of pd free. */
@@ -1287,7 +1268,6 @@ alloc:
if (ppgtt->node.start < dev_priv->gtt.mappable_end)
DRM_DEBUG("Forced to use aperture for PDEs\n");
- ppgtt->num_pd_entries = I915_PDES_PER_PD;
return 0;
err_out:
@@ -1306,8 +1286,7 @@ static int gen6_ppgtt_alloc(struct i915_hw_ppgtt *ppgtt, bool preallocate_pt)
if (!preallocate_pt)
return 0;
- ret = alloc_pt_range(&ppgtt->pd, 0, ppgtt->num_pd_entries,
- ppgtt->base.dev);
+ ret = alloc_pt_range(&ppgtt->pd, 0, I915_PDES_PER_PD, ppgtt->base.dev);
if (ret) {
free_pt_scratch(ppgtt->scratch_pt, ppgtt->base.dev);
drm_mm_remove_node(&ppgtt->node);
@@ -1356,7 +1335,7 @@ static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt, bool aliasing)
ppgtt->base.insert_entries = gen6_ppgtt_insert_entries;
ppgtt->base.cleanup = gen6_ppgtt_cleanup;
ppgtt->base.start = 0;
- ppgtt->base.total = ppgtt->num_pd_entries * GEN6_PTES_PER_PT * PAGE_SIZE;
+ ppgtt->base.total = I915_PDES_PER_PD * GEN6_PTES_PER_PT * PAGE_SIZE;
ppgtt->debug_dump = gen6_dump_ppgtt;
ppgtt->pd.pd_offset =
@@ -1599,7 +1578,7 @@ void i915_gem_restore_gtt_mappings(struct drm_device *dev)
if (i915_is_ggtt(vm))
ppgtt = dev_priv->mm.aliasing_ppgtt;
- gen6_map_page_range(dev_priv, &ppgtt->pd, 0, ppgtt->num_pd_entries);
+ gen6_map_page_range(dev_priv, &ppgtt->pd, 0, I915_PDES_PER_PD);
}
i915_gem_chipset_flush(dev);
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index 3c28365..18a0b68 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -265,8 +265,6 @@ struct i915_hw_ppgtt {
struct i915_address_space base;
struct kref ref;
struct drm_mm_node node;
- unsigned num_pd_entries;
- unsigned num_pd_pages; /* gen8+ */
union {
struct i915_pagedirpo pdp;
struct i915_pagedir pd;
@@ -333,6 +331,11 @@ struct i915_gtt {
temp = min(temp, (unsigned)length), \
start += temp, length -= temp)
+#define gen6_for_all_pdes(pt, ppgtt, iter) \
+ for (iter = 0, pt = ppgtt->pd.page_tables[iter]; \
+ iter < gen6_pde_index(ppgtt->base.total); \
+ pt = ppgtt->pd.page_tables[++iter])
+
static inline uint32_t i915_pte_index(uint64_t address, uint32_t pde_shift)
{
const uint32_t mask = NUM_PTE(pde_shift) - 1;
--
2.0.4
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