[Intel-gfx] [PATCH 56/68] drm/i915/bdw: Abstract PDP usage
Ben Widawsky
benjamin.widawsky at intel.com
Fri Aug 22 05:12:19 CEST 2014
Up until now, ppgtt->pdp has always been the root of our page tables.
Legacy 32b addresses acted like it had 1 PDP with 4 PDPEs.
In preparation for 4 level page tables, we need to stop use ppgtt->pdp
directly unless we know it's what we want. The future structure will use
ppgtt->pml4 for the top level, and the pdp is just one of the entries
being pointed to by a pml4e.
This patch addresses some carelessness done throughout development wrt
assumptions made of the root page tables.
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 160 ++++++++++++++++++++----------------
1 file changed, 88 insertions(+), 72 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 8e15842..7cc6cf9 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -491,6 +491,7 @@ static void gen8_ppgtt_clear_range(struct i915_address_space *vm,
{
struct i915_hw_ppgtt *ppgtt =
container_of(vm, struct i915_hw_ppgtt, base);
+ struct i915_pagedirpo *pdp = &ppgtt->pdp; /* FIXME: 48b */
gen8_gtt_pte_t *pt_vaddr, scratch_pte;
unsigned pdpe = gen8_pdpe_index(start);
unsigned pde = gen8_pde_index(start);
@@ -502,7 +503,7 @@ static void gen8_ppgtt_clear_range(struct i915_address_space *vm,
I915_CACHE_LLC, use_scratch);
while (num_entries) {
- struct i915_pagedir *pd = ppgtt->pdp.pagedirs[pdpe];
+ struct i915_pagedir *pd = pdp->pagedirs[pdpe];
struct i915_pagetab *pt = pd->page_tables[pde];
struct page *page_table = pt->page;
@@ -536,6 +537,7 @@ static void gen8_ppgtt_insert_entries(struct i915_address_space *vm,
{
struct i915_hw_ppgtt *ppgtt =
container_of(vm, struct i915_hw_ppgtt, base);
+ struct i915_pagedirpo *pdp = &ppgtt->pdp; /* FIXME: 48b */
gen8_gtt_pte_t *pt_vaddr;
unsigned pdpe = gen8_pdpe_index(start);
unsigned pde = gen8_pde_index(start);
@@ -546,7 +548,7 @@ static void gen8_ppgtt_insert_entries(struct i915_address_space *vm,
for_each_sg_page(pages->sgl, &sg_iter, pages->nents, 0) {
if (pt_vaddr == NULL) {
- struct i915_pagedir *pd = ppgtt->pdp.pagedirs[pdpe];
+ struct i915_pagedir *pd = pdp->pagedirs[pdpe];
struct i915_pagetab *pt = pd->page_tables[pde];
struct page *page_table = pt->page;
pt_vaddr = kmap_atomic(page_table);
@@ -604,24 +606,26 @@ static void gen8_map_pagetable_range(struct i915_pagedir *pd,
kunmap_atomic(pagedir);
}
-static void __gen8_teardown_va_range(struct i915_address_space *vm,
- uint64_t start, uint64_t length,
- bool dead)
+static void gen8_teardown_va_range_3lvl(struct i915_address_space *vm,
+ struct i915_pagedirpo *pdp,
+ uint64_t start, uint64_t length,
+ bool dead)
{
- struct i915_hw_ppgtt *ppgtt =
- container_of(vm, struct i915_hw_ppgtt, base);
struct drm_device *dev = vm->dev;
struct i915_pagedir *pd;
struct i915_pagetab *pt;
uint64_t temp;
uint32_t pdpe, pde;
- if (!ppgtt->pdp.pagedirs) {
+ BUG_ON(!pdp);
+ if (!pdp->pagedirs) {
+ WARN(!bitmap_empty(pdp->used_pdpes, I915_PDPES_PER_PDP(dev)),
+ "Page directory leak detected\n");
/* If pagedirs are already free, there is nothing to do.*/
return;
}
- gen8_for_each_pdpe(pd, &ppgtt->pdp, start, length, temp, pdpe) {
+ gen8_for_each_pdpe(pd, pdp, start, length, temp, pdpe) {
uint64_t pd_len = gen8_clamp_pd(start, length);
uint64_t pd_start = start;
@@ -629,19 +633,19 @@ static void __gen8_teardown_va_range(struct i915_address_space *vm,
* down, and up.
*/
if (!pd) {
- WARN(test_bit(pdpe, ppgtt->pdp.used_pdpes),
+ WARN(test_bit(pdpe, pdp->used_pdpes),
"PDPE %d is not allocated, but is reserved (%p)\n",
pdpe, vm);
continue;
} else {
if (dead && pd->zombie) {
- WARN_ON(test_bit(pdpe, ppgtt->pdp.used_pdpes));
+ WARN_ON(test_bit(pdpe, pdp->used_pdpes));
free_pd_single(pd, vm->dev);
- ppgtt->pdp.pagedirs[pdpe] = NULL;
+ pdp->pagedirs[pdpe] = NULL;
continue;
}
- WARN(!test_bit(pdpe, ppgtt->pdp.used_pdpes),
+ WARN(!test_bit(pdpe, pdp->used_pdpes),
"PDPE %d not reserved, but is allocated (%p)",
pdpe, vm);
}
@@ -683,7 +687,7 @@ static void __gen8_teardown_va_range(struct i915_address_space *vm,
gen8_ppgtt_clear_range(vm, pd_start, pd_len, true);
if (bitmap_empty(pd->used_pdes, I915_PDES_PER_PD)) {
- WARN_ON(!test_and_clear_bit(pdpe, ppgtt->pdp.used_pdpes));
+ WARN_ON(!test_and_clear_bit(pdpe, pdp->used_pdpes));
if (!dead) {
/* We've unmapped a possibly live context. Make
* note of it so we can clean it up later. */
@@ -691,20 +695,32 @@ static void __gen8_teardown_va_range(struct i915_address_space *vm,
continue;
}
free_pd_single(pd, dev);
- ppgtt->pdp.pagedirs[pdpe] = NULL;
+ pdp->pagedirs[pdpe] = NULL;
}
}
- if (bitmap_empty(ppgtt->pdp.used_pdpes, I915_PDPES_PER_PDP(dev))) {
- /* TODO: When pagetables are fully dynamic:
- free_pdp_single(&ppgtt->pdp, dev); */
- }
+ if (dead && bitmap_empty(pdp->used_pdpes, I915_PDPES_PER_PDP(dev)))
+ free_pdp_single(pdp, dev);
+}
+
+static void gen8_teardown_va_range_4lvl(struct i915_address_space *vm,
+ struct i915_pml4 *pml4,
+ uint64_t start, uint64_t length,
+ bool dead)
+{
+ BUG();
}
static void gen8_teardown_va_range(struct i915_address_space *vm,
uint64_t start, uint64_t length)
{
- __gen8_teardown_va_range(vm, start, length, false);
+ struct i915_hw_ppgtt *ppgtt =
+ container_of(vm, struct i915_hw_ppgtt, base);
+
+ if (!HAS_48B_PPGTT(vm->dev))
+ gen8_teardown_va_range_3lvl(vm, &ppgtt->pdp, start, length, false);
+ else
+ gen8_teardown_va_range_4lvl(vm, &ppgtt->pml4, start, length, false);
}
static void gen8_ppgtt_free(struct i915_hw_ppgtt *ppgtt)
@@ -712,12 +728,10 @@ static void gen8_ppgtt_free(struct i915_hw_ppgtt *ppgtt)
trace_i915_va_teardown(&ppgtt->base,
ppgtt->base.start, ppgtt->base.total,
VM_TO_TRACE_NAME(&ppgtt->base));
- __gen8_teardown_va_range(&ppgtt->base,
- ppgtt->base.start, ppgtt->base.total,
- true);
- WARN_ON(!bitmap_empty(ppgtt->pdp.used_pdpes,
- I915_PDPES_PER_PDP(ppgtt->base.dev)));
- free_pdp_single(&ppgtt->pdp, ppgtt->base.dev);
+ gen8_teardown_va_range_3lvl(&ppgtt->base, &ppgtt->pdp,
+ ppgtt->base.start, ppgtt->base.total,
+ true);
+ BUG_ON(ppgtt->pdp.pagedirs); /* FIXME: 48b */
}
static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
@@ -733,7 +747,7 @@ static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
/**
* gen8_ppgtt_alloc_pagetabs() - Allocate page tables for VA range.
- * @ppgtt: Master ppgtt structure.
+ * @vm: Master vm structure.
* @pd: Page directory for this address range.
* @start: Starting virtual address to begin allocations.
* @length Size of the allocations.
@@ -749,12 +763,13 @@ static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
*
* Return: 0 if success; negative error code otherwise.
*/
-static int gen8_ppgtt_alloc_pagetabs(struct i915_hw_ppgtt *ppgtt,
+static int gen8_ppgtt_alloc_pagetabs(struct i915_address_space *vm,
struct i915_pagedir *pd,
uint64_t start,
uint64_t length,
unsigned long *new_pts)
{
+ struct drm_device *dev = vm->dev;
struct i915_pagetab *pt;
uint64_t temp;
uint32_t pde;
@@ -772,7 +787,7 @@ static int gen8_ppgtt_alloc_pagetabs(struct i915_hw_ppgtt *ppgtt,
continue;
}
- pt = alloc_pt_single(ppgtt->base.dev);
+ pt = alloc_pt_single(dev);
if (IS_ERR(pt))
goto unwind_out;
@@ -784,14 +799,14 @@ static int gen8_ppgtt_alloc_pagetabs(struct i915_hw_ppgtt *ppgtt,
unwind_out:
for_each_set_bit(pde, new_pts, I915_PDES_PER_PD)
- free_pt_single(pd->page_tables[pde], ppgtt->base.dev);
+ free_pt_single(pd->page_tables[pde], dev);
return -ENOMEM;
}
/**
* gen8_ppgtt_alloc_pagedirs() - Allocate page directories for VA range.
- * @ppgtt: Master ppgtt structure.
+ * @vm: Master vm structure.
* @pdp: Page directory pointer for this address range.
* @start: Starting virtual address to begin allocations.
* @length Size of the allocations.
@@ -812,17 +827,17 @@ unwind_out:
*
* Return: 0 if success; negative error code otherwise.
*/
-static int gen8_ppgtt_alloc_pagedirs(struct i915_hw_ppgtt *ppgtt,
+static int gen8_ppgtt_alloc_pagedirs(struct i915_address_space *vm,
struct i915_pagedirpo *pdp,
uint64_t start,
uint64_t length,
unsigned long *new_pds)
{
- struct drm_device *dev = ppgtt->base.dev;
+ struct drm_device *dev = vm->dev;
struct i915_pagedir *pd;
uint64_t temp;
uint32_t pdpe;
- size_t pdpes = I915_PDPES_PER_PDP(ppgtt->base.dev);
+ size_t pdpes = I915_PDPES_PER_PDP(vm->dev);
BUG_ON(!bitmap_empty(new_pds, pdpes));
@@ -833,7 +848,7 @@ static int gen8_ppgtt_alloc_pagedirs(struct i915_hw_ppgtt *ppgtt,
if (pd)
continue;
- pd = alloc_pd_single(ppgtt->base.dev);
+ pd = alloc_pd_single(dev);
if (IS_ERR(pd))
goto unwind_out;
@@ -845,7 +860,7 @@ static int gen8_ppgtt_alloc_pagedirs(struct i915_hw_ppgtt *ppgtt,
unwind_out:
for_each_set_bit(pdpe, new_pds, pdpes)
- free_pd_single(pdp->pagedirs[pdpe], ppgtt->base.dev);
+ free_pd_single(pdp->pagedirs[pdpe], dev);
return -ENOMEM;
}
@@ -899,12 +914,11 @@ err_out:
return -ENOMEM;
}
-static int gen8_alloc_va_range(struct i915_address_space *vm,
- uint64_t start,
- uint64_t length)
+static int gen8_alloc_va_range_3lvl(struct i915_address_space *vm,
+ struct i915_pagedirpo *pdp,
+ uint64_t start,
+ uint64_t length)
{
- struct i915_hw_ppgtt *ppgtt =
- container_of(vm, struct i915_hw_ppgtt, base);
unsigned long *new_page_dirs, **new_page_tables;
struct drm_device *dev = vm->dev;
struct i915_pagedir *pd;
@@ -934,18 +948,15 @@ static int gen8_alloc_va_range(struct i915_address_space *vm,
return ret;
/* Do the allocations first so we can easily bail out */
- ret = gen8_ppgtt_alloc_pagedirs(ppgtt, &ppgtt->pdp, start, length,
- new_page_dirs);
+ ret = gen8_ppgtt_alloc_pagedirs(vm, pdp, start, length, new_page_dirs);
if (ret) {
free_gen8_temp_bitmaps(new_page_dirs, new_page_tables, pdpes);
return ret;
}
- /* For every page directory referenced, allocate page tables */
- gen8_for_each_pdpe(pd, &ppgtt->pdp, start, length, temp, pdpe) {
+ gen8_for_each_pdpe(pd, pdp, start, length, temp, pdpe) {
bitmap_zero(new_page_tables[pdpe], I915_PDES_PER_PD);
- ret = gen8_ppgtt_alloc_pagetabs(ppgtt, pd, start, length,
- new_page_tables[pdpe]);
+ ret = gen8_ppgtt_alloc_pagetabs(vm, pd, start, length, new_page_tables[pdpe]);
if (ret)
goto err_out;
}
@@ -953,10 +964,7 @@ static int gen8_alloc_va_range(struct i915_address_space *vm,
start = orig_start;
length = orig_length;
- /* Allocations have completed successfully, so set the bitmaps, and do
- * the mappings. */
- gen8_for_each_pdpe(pd, &ppgtt->pdp, start, length, temp, pdpe) {
- gen8_ppgtt_pde_t *const pagedir = kmap_atomic(pd->page);
+ gen8_for_each_pdpe(pd, pdp, start, length, temp, pdpe) {
struct i915_pagetab *pt;
uint64_t pd_len = gen8_clamp_pd(start, length);
uint64_t pd_start = start;
@@ -978,25 +986,12 @@ static int gen8_alloc_va_range(struct i915_address_space *vm,
/* Our pde is now pointing to the pagetable, pt */
set_bit(pde, pd->used_pdes);
-
- /* Map the PDE to the page table */
- __gen8_do_map_pt(pagedir + pde, pt, vm->dev);
-
- /* NB: We haven't yet mapped ptes to pages. At this
- * point we're still relying on insert_entries() */
-
- /* No longer possible this page table is a zombie */
pt->zombie = 0;
}
- if (!HAS_LLC(vm->dev))
- drm_clflush_virt_range(pagedir, PAGE_SIZE);
-
- kunmap_atomic(pagedir);
-
- set_bit(pdpe, ppgtt->pdp.used_pdpes);
- /* This pd is officially not a zombie either */
- ppgtt->pdp.pagedirs[pdpe]->zombie = 0;
+ set_bit(pdpe, pdp->used_pdpes);
+ gen8_map_pagetable_range(pd, start, length, dev);
+ pd->zombie = 0;
}
free_gen8_temp_bitmaps(new_page_dirs, new_page_tables, pdpes);
@@ -1005,16 +1000,36 @@ static int gen8_alloc_va_range(struct i915_address_space *vm,
err_out:
while (pdpe--) {
for_each_set_bit(temp, new_page_tables[pdpe], I915_PDES_PER_PD)
- free_pt_single(pd->page_tables[temp], vm->dev);
+ free_pt_single(pd->page_tables[temp], dev);
}
for_each_set_bit(pdpe, new_page_dirs, pdpes)
- free_pd_single(ppgtt->pdp.pagedirs[pdpe], vm->dev);
+ free_pd_single(pdp->pagedirs[pdpe], dev);
free_gen8_temp_bitmaps(new_page_dirs, new_page_tables, pdpes);
return ret;
}
+static int __noreturn gen8_alloc_va_range_4lvl(struct i915_address_space *vm,
+ struct i915_pml4 *pml4,
+ uint64_t start,
+ uint64_t length)
+{
+ BUG();
+}
+
+static int gen8_alloc_va_range(struct i915_address_space *vm,
+ uint64_t start, uint64_t length)
+{
+ struct i915_hw_ppgtt *ppgtt =
+ container_of(vm, struct i915_hw_ppgtt, base);
+
+ if (!HAS_48B_PPGTT(vm->dev))
+ return gen8_alloc_va_range_3lvl(vm, &ppgtt->pdp, start, length);
+ else
+ return gen8_alloc_va_range_4lvl(vm, &ppgtt->pml4, start, length);
+}
+
static void gen8_ppgtt_fini_common(struct i915_hw_ppgtt *ppgtt)
{
free_pt_scratch(ppgtt->scratch_pd, ppgtt->base.dev);
@@ -1060,12 +1075,13 @@ static int gen8_aliasing_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
{
struct drm_device *dev = ppgtt->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
+ struct i915_pagedirpo *pdp = &ppgtt->pdp; /* FIXME: 48b */
struct i915_pagedir *pd;
uint64_t temp, start = 0, size = dev_priv->gtt.base.total;
uint32_t pdpe;
int ret;
- ret = gen8_ppgtt_init_common(ppgtt, dev_priv->gtt.base.total);
+ ret = gen8_ppgtt_init_common(ppgtt, size);
if (ret)
return ret;
@@ -1078,8 +1094,8 @@ static int gen8_aliasing_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
return ret;
}
- gen8_for_each_pdpe(pd, &ppgtt->pdp, start, size, temp, pdpe)
- gen8_map_pagetable_range(pd, start, size, ppgtt->base.dev);
+ gen8_for_each_pdpe(pd, pdp, start, size, temp, pdpe)
+ gen8_map_pagetable_range(pd, start, size, dev);
ppgtt->base.allocate_va_range = NULL;
ppgtt->base.teardown_va_range = NULL;
--
2.0.4
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