[Intel-gfx] [PATCH 03/16] drm/i915/gen8: Abstract PDP usage
Michel Thierry
michel.thierry at intel.com
Tue May 26 07:21:10 PDT 2015
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.
v2: Updated after dynamic page allocation changes.
v3: Rebase after s/page_tables/page_table/.
v4: Rebase after changes in "Dynamic page table allocations" patch.
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
Signed-off-by: Michel Thierry <michel.thierry at intel.com> (v2+)
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 141 +++++++++++++++++++++++-------------
1 file changed, 90 insertions(+), 51 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index a288f6b..a950f26 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -550,6 +550,7 @@ 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_page_directory_pointer *pdp = &ppgtt->pdp; /* FIXME: 48b */
gen8_pte_t *pt_vaddr, scratch_pte;
unsigned pdpe = start >> GEN8_PDPE_SHIFT & GEN8_PDPE_MASK;
unsigned pde = start >> GEN8_PDE_SHIFT & GEN8_PDE_MASK;
@@ -565,10 +566,10 @@ static void gen8_ppgtt_clear_range(struct i915_address_space *vm,
struct i915_page_table *pt;
struct page *page_table;
- if (WARN_ON(!ppgtt->pdp.page_directory[pdpe]))
+ if (WARN_ON(!pdp->page_directory[pdpe]))
continue;
- pd = ppgtt->pdp.page_directory[pdpe];
+ pd = pdp->page_directory[pdpe];
if (WARN_ON(!pd->page_table[pde]))
continue;
@@ -610,6 +611,7 @@ 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_page_directory_pointer *pdp = &ppgtt->pdp; /* FIXME: 48b */
gen8_pte_t *pt_vaddr;
unsigned pdpe = start >> GEN8_PDPE_SHIFT & GEN8_PDPE_MASK;
unsigned pde = start >> GEN8_PDE_SHIFT & GEN8_PDE_MASK;
@@ -620,7 +622,7 @@ 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_page_directory *pd = ppgtt->pdp.page_directory[pdpe];
+ struct i915_page_directory *pd = pdp->page_directory[pdpe];
struct i915_page_table *pt = pd->page_table[pde];
struct page *page_table = pt->page;
@@ -675,6 +677,28 @@ static void gen8_initialize_pd(struct i915_address_space *vm,
if (!HAS_LLC(vm->dev))
drm_clflush_virt_range(page_directory, PAGE_SIZE);
+
+ kunmap_atomic(page_directory);
+}
+
+/* It's likely we'll map more than one pagetable at a time. This function will
+ * save us unnecessary kmap calls, but do no more functionally than multiple
+ * calls to map_pt. */
+static void gen8_map_pagetable_range(struct i915_page_directory *pd,
+ uint64_t start,
+ uint64_t length,
+ struct drm_device *dev)
+{
+ gen8_pde_t * const page_directory = kmap_atomic(pd->page);
+ struct i915_page_table *pt;
+ uint64_t temp, pde;
+
+ gen8_for_each_pde(pt, pd, start, length, temp, pde)
+ __gen8_do_map_pt(page_directory + pde, pt, dev);
+
+ if (!HAS_LLC(dev))
+ drm_clflush_virt_range(page_directory, PAGE_SIZE);
+
kunmap_atomic(page_directory);
}
@@ -700,23 +724,29 @@ static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
container_of(vm, struct i915_hw_ppgtt, base);
int i;
- for_each_set_bit(i, ppgtt->pdp.used_pdpes,
- I915_PDPES_PER_PDP(ppgtt->base.dev)) {
- if (WARN_ON(!ppgtt->pdp.page_directory[i]))
- continue;
+ if (!USES_FULL_48BIT_PPGTT(ppgtt->base.dev)) {
+ for_each_set_bit(i, ppgtt->pdp.used_pdpes,
+ I915_PDPES_PER_PDP(ppgtt->base.dev)) {
+ if (WARN_ON(!ppgtt->pdp.page_directory[i]))
+ continue;
- gen8_free_page_tables(ppgtt->pdp.page_directory[i], ppgtt->base.dev);
- unmap_and_free_pd(ppgtt->pdp.page_directory[i], ppgtt->base.dev);
+ gen8_free_page_tables(ppgtt->pdp.page_directory[i],
+ ppgtt->base.dev);
+ unmap_and_free_pd(ppgtt->pdp.page_directory[i],
+ ppgtt->base.dev);
+ }
+ unmap_and_free_pdp(&ppgtt->pdp, ppgtt->base.dev);
+ } else {
+ WARN_ON(1); /* to be implemented later */
}
- unmap_and_free_pdp(&ppgtt->pdp, ppgtt->base.dev);
unmap_and_free_pd(ppgtt->scratch_pd, ppgtt->base.dev);
unmap_and_free_pt(ppgtt->scratch_pt, ppgtt->base.dev);
}
/**
* 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.
@@ -732,13 +762,15 @@ 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_page_directory *pd,
uint64_t start,
uint64_t length,
unsigned long *new_pts)
{
- struct drm_device *dev = ppgtt->base.dev;
+ struct i915_hw_ppgtt *ppgtt =
+ container_of(vm, struct i915_hw_ppgtt, base);
+ struct drm_device *dev = vm->dev;
struct i915_page_table *pt;
uint64_t temp;
uint32_t pde;
@@ -755,7 +787,7 @@ static int gen8_ppgtt_alloc_pagetabs(struct i915_hw_ppgtt *ppgtt,
if (IS_ERR(pt))
goto unwind_out;
- gen8_initialize_pt(&ppgtt->base, pt);
+ gen8_initialize_pt(vm, pt);
pd->page_table[pde] = pt;
set_bit(pde, new_pts);
}
@@ -771,7 +803,7 @@ unwind_out:
/**
* gen8_ppgtt_alloc_page_directories() - 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.
@@ -792,17 +824,18 @@ unwind_out:
*
* Return: 0 if success; negative error code otherwise.
*/
-static int gen8_ppgtt_alloc_page_directories(struct i915_hw_ppgtt *ppgtt,
- struct i915_page_directory_pointer *pdp,
- uint64_t start,
- uint64_t length,
- unsigned long *new_pds)
+static int
+gen8_ppgtt_alloc_page_directories(struct i915_address_space *vm,
+ struct i915_page_directory_pointer *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_page_directory *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);
WARN_ON(!bitmap_empty(new_pds, pdpes));
@@ -817,7 +850,7 @@ static int gen8_ppgtt_alloc_page_directories(struct i915_hw_ppgtt *ppgtt,
if (IS_ERR(pd))
goto unwind_out;
- gen8_initialize_pd(&ppgtt->base, pd);
+ gen8_initialize_pd(vm, pd);
pdp->page_directory[pdpe] = pd;
set_bit(pdpe, new_pds);
}
@@ -882,13 +915,13 @@ 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_page_directory_pointer *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_page_directory *pd;
const uint64_t orig_start = start;
const uint64_t orig_length = length;
@@ -908,16 +941,14 @@ 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_page_directories(ppgtt, &ppgtt->pdp, start, length,
- new_page_dirs);
+ ret = gen8_ppgtt_alloc_page_directories(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) {
- ret = gen8_ppgtt_alloc_pagetabs(ppgtt, pd, start, length,
+ gen8_for_each_pdpe(pd, pdp, start, length, temp, pdpe) {
+ ret = gen8_ppgtt_alloc_pagetabs(vm, pd, start, length,
new_page_tables[pdpe]);
if (ret)
goto err_out;
@@ -926,10 +957,7 @@ 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_pde_t *const page_directory = kmap_atomic(pd->page);
+ gen8_for_each_pdpe(pd, pdp, start, length, temp, pdpe) {
struct i915_page_table *pt;
uint64_t pd_len = length;
uint64_t pd_start = start;
@@ -951,20 +979,10 @@ 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(page_directory + pde, pt, vm->dev);
-
- /* NB: We haven't yet mapped ptes to pages. At this
- * point we're still relying on insert_entries() */
}
- if (!HAS_LLC(vm->dev))
- drm_clflush_virt_range(page_directory, PAGE_SIZE);
-
- kunmap_atomic(page_directory);
-
- set_bit(pdpe, ppgtt->pdp.used_pdpes);
+ set_bit(pdpe, pdp->used_pdpes);
+ gen8_map_pagetable_range(pd, start, length, dev);
}
free_gen8_temp_bitmaps(new_page_dirs, new_page_tables, pdpes);
@@ -973,16 +991,37 @@ 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)
- unmap_and_free_pt(ppgtt->pdp.page_directory[pdpe]->page_table[temp], vm->dev);
+ unmap_and_free_pt(pdp->page_directory[pdpe]->page_table[temp], dev);
}
for_each_set_bit(pdpe, new_page_dirs, pdpes)
- unmap_and_free_pd(ppgtt->pdp.page_directory[pdpe], vm->dev);
+ unmap_and_free_pd(pdp->page_directory[pdpe], dev);
free_gen8_temp_bitmaps(new_page_dirs, new_page_tables, pdpes);
return ret;
}
+static int gen8_alloc_va_range_4lvl(struct i915_address_space *vm,
+ struct i915_pml4 *pml4,
+ uint64_t start,
+ uint64_t length)
+{
+ WARN_ON(1); /* to be implemented later */
+ return 0;
+}
+
+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 (!USES_FULL_48BIT_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);
+}
+
/*
* GEN8 legacy ppgtt programming is accomplished through a max 4 PDP registers
* with a net effect resembling a 2-level page table in normal x86 terms. Each
--
2.4.0
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