static struct i915_page_table *alloc_pt(struct i915_address_space *vm)
{
struct i915_page_table *pt;
- const size_t count = INTEL_GEN(vm->i915) >= 8 ? GEN8_PTES : GEN6_PTES;
- int ret = -ENOMEM;
- pt = kzalloc(sizeof(*pt), GFP_KERNEL);
- if (!pt)
+ pt = kmalloc(sizeof(*pt), GFP_KERNEL | __GFP_NOWARN);
+ if (unlikely(!pt))
return ERR_PTR(-ENOMEM);
- pt->used_ptes = kcalloc(BITS_TO_LONGS(count), sizeof(*pt->used_ptes),
- GFP_KERNEL);
-
- if (!pt->used_ptes)
- goto fail_bitmap;
-
- ret = setup_px(vm, pt);
- if (ret)
- goto fail_page_m;
+ if (unlikely(setup_px(vm, pt))) {
+ kfree(pt);
+ return ERR_PTR(-ENOMEM);
+ }
+ pt->used_ptes = 0;
return pt;
-
-fail_page_m:
- kfree(pt->used_ptes);
-fail_bitmap:
- kfree(pt);
-
- return ERR_PTR(ret);
}
static void free_pt(struct i915_address_space *vm, struct i915_page_table *pt)
{
cleanup_px(vm, pt);
- kfree(pt->used_ptes);
kfree(pt);
}
static void gen8_initialize_pt(struct i915_address_space *vm,
struct i915_page_table *pt)
{
- gen8_pte_t scratch_pte;
-
- scratch_pte = gen8_pte_encode(vm->scratch_page.daddr,
- I915_CACHE_LLC);
-
- fill_px(vm, pt, scratch_pte);
+ fill_px(vm, pt,
+ gen8_pte_encode(vm->scratch_page.daddr, I915_CACHE_LLC));
}
static void gen6_initialize_pt(struct i915_address_space *vm,
struct i915_page_table *pt)
{
- gen6_pte_t scratch_pte;
-
- WARN_ON(vm->scratch_page.daddr == 0);
-
- scratch_pte = vm->pte_encode(vm->scratch_page.daddr,
- I915_CACHE_LLC, 0);
-
- fill32_px(vm, pt, scratch_pte);
+ fill32_px(vm, pt,
+ vm->pte_encode(vm->scratch_page.daddr, I915_CACHE_LLC, 0));
}
static struct i915_page_directory *alloc_pd(struct i915_address_space *vm)
static void gen8_initialize_pd(struct i915_address_space *vm,
struct i915_page_directory *pd)
{
- gen8_pde_t scratch_pde;
+ unsigned int i;
- scratch_pde = gen8_pde_encode(px_dma(vm->scratch_pt), I915_CACHE_LLC);
-
- fill_px(vm, pd, scratch_pde);
+ fill_px(vm, pd,
+ gen8_pde_encode(px_dma(vm->scratch_pt), I915_CACHE_LLC));
+ for (i = 0; i < I915_PDES; i++)
+ pd->page_table[i] = vm->scratch_pt;
}
static int __pdp_init(struct drm_i915_private *dev_priv,
*/
static bool gen8_ppgtt_clear_pt(struct i915_address_space *vm,
struct i915_page_table *pt,
- uint64_t start,
- uint64_t length)
+ u64 start, u64 length)
{
unsigned int num_entries = gen8_pte_count(start, length);
unsigned int pte = gen8_pte_index(start);
gen8_pte_encode(vm->scratch_page.daddr, I915_CACHE_LLC);
gen8_pte_t *vaddr;
- if (WARN_ON(!px_page(pt)))
- return false;
-
- GEM_BUG_ON(pte_end > GEN8_PTES);
+ GEM_BUG_ON(num_entries > pt->used_ptes);
- bitmap_clear(pt->used_ptes, pte, num_entries);
- if (USES_FULL_PPGTT(vm->i915)) {
- if (bitmap_empty(pt->used_ptes, GEN8_PTES))
- return true;
- }
+ pt->used_ptes -= num_entries;
+ if (!pt->used_ptes)
+ return true;
vaddr = kmap_atomic_px(pt);
while (pte < pte_end)
return false;
}
+static void gen8_ppgtt_set_pde(struct i915_address_space *vm,
+ struct i915_page_directory *pd,
+ struct i915_page_table *pt,
+ unsigned int pde)
+{
+ gen8_pde_t *vaddr;
+
+ pd->page_table[pde] = pt;
+
+ vaddr = kmap_atomic_px(pd);
+ vaddr[pde] = gen8_pde_encode(px_dma(pt), I915_CACHE_LLC);
+ kunmap_atomic(vaddr);
+}
+
/* Removes entries from a single page dir, releasing it if it's empty.
* Caller can use the return value to update higher-level entries
*/
static bool gen8_ppgtt_clear_pd(struct i915_address_space *vm,
struct i915_page_directory *pd,
- uint64_t start,
- uint64_t length)
+ u64 start, u64 length)
{
struct i915_page_table *pt;
- uint64_t pde;
- gen8_pde_t *pde_vaddr;
- gen8_pde_t scratch_pde = gen8_pde_encode(px_dma(vm->scratch_pt),
- I915_CACHE_LLC);
+ u32 pde;
gen8_for_each_pde(pt, pd, start, length, pde) {
- if (WARN_ON(!pd->page_table[pde]))
- break;
+ if (!gen8_ppgtt_clear_pt(vm, pt, start, length))
+ continue;
- if (gen8_ppgtt_clear_pt(vm, pt, start, length)) {
- __clear_bit(pde, pd->used_pdes);
- pde_vaddr = kmap_atomic_px(pd);
- pde_vaddr[pde] = scratch_pde;
- kunmap_atomic(pde_vaddr);
- free_pt(vm, pt);
- }
+ gen8_ppgtt_set_pde(vm, pd, vm->scratch_pt, pde);
+ __clear_bit(pde, pd->used_pdes);
+
+ free_pt(vm, pt);
}
if (bitmap_empty(pd->used_pdes, I915_PDES))
* @pd: Page directory for this address range.
* @start: Starting virtual address to begin allocations.
* @length: Size of the allocations.
- * @new_pts: Bitmap set by function with new allocations. Likely used by the
- * caller to free on error.
*
* Allocate the required number of page tables. Extremely similar to
* gen8_ppgtt_alloc_page_directories(). The main difference is here we are limited by
*/
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)
+ u64 start, u64 length)
{
struct i915_page_table *pt;
+ u64 from = start;
uint32_t pde;
gen8_for_each_pde(pt, pd, start, length, pde) {
/* Don't reallocate page tables */
- if (test_bit(pde, pd->used_pdes)) {
- /* Scratch is never allocated this way */
- WARN_ON(pt == vm->scratch_pt);
- continue;
- }
-
- pt = alloc_pt(vm);
- if (IS_ERR(pt))
- goto unwind_out;
+ if (!test_bit(pde, pd->used_pdes)) {
+ pt = alloc_pt(vm);
+ if (IS_ERR(pt))
+ goto unwind;
- gen8_initialize_pt(vm, pt);
- pd->page_table[pde] = pt;
- __set_bit(pde, new_pts);
+ gen8_initialize_pt(vm, pt);
+ pd->page_table[pde] = pt;
+ }
+ pt->used_ptes += gen8_pte_count(start, length);
trace_i915_page_table_entry_alloc(vm, pde, start, GEN8_PDE_SHIFT);
}
return 0;
-unwind_out:
- for_each_set_bit(pde, new_pts, I915_PDES)
- free_pt(vm, pd->page_table[pde]);
-
+unwind:
+ gen8_ppgtt_clear_pd(vm, pd, from, start - from);
return -ENOMEM;
}
}
static void
-free_gen8_temp_bitmaps(unsigned long *new_pds, unsigned long *new_pts)
+free_gen8_temp_bitmaps(unsigned long *new_pds)
{
- kfree(new_pts);
kfree(new_pds);
}
*/
static
int __must_check alloc_gen8_temp_bitmaps(unsigned long **new_pds,
- unsigned long **new_pts,
uint32_t pdpes)
{
unsigned long *pds;
- unsigned long *pts;
pds = kcalloc(BITS_TO_LONGS(pdpes), sizeof(unsigned long), GFP_TEMPORARY);
if (!pds)
return -ENOMEM;
- pts = kcalloc(pdpes, BITS_TO_LONGS(I915_PDES) * sizeof(unsigned long),
- GFP_TEMPORARY);
- if (!pts)
- goto err_out;
-
*new_pds = pds;
- *new_pts = pts;
-
return 0;
-
-err_out:
- free_gen8_temp_bitmaps(pds, pts);
- return -ENOMEM;
}
static int gen8_alloc_va_range_3lvl(struct i915_address_space *vm,
uint64_t length)
{
struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
- unsigned long *new_page_dirs, *new_page_tables;
+ unsigned long *new_page_dirs;
struct i915_page_directory *pd;
const uint64_t orig_start = start;
const uint64_t orig_length = length;
uint32_t pdpes = I915_PDPES_PER_PDP(dev_priv);
int ret;
- ret = alloc_gen8_temp_bitmaps(&new_page_dirs, &new_page_tables, pdpes);
+ ret = alloc_gen8_temp_bitmaps(&new_page_dirs, pdpes);
if (ret)
return ret;
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);
+ free_gen8_temp_bitmaps(new_page_dirs);
return ret;
}
/* For every page directory referenced, allocate page tables */
gen8_for_each_pdpe(pd, pdp, start, length, pdpe) {
- ret = gen8_ppgtt_alloc_pagetabs(vm, pd, start, length,
- new_page_tables + pdpe * BITS_TO_LONGS(I915_PDES));
+ ret = gen8_ppgtt_alloc_pagetabs(vm, pd, start, length);
if (ret)
goto err_out;
}
WARN_ON(!pd_len);
WARN_ON(!gen8_pte_count(pd_start, pd_len));
- /* Set our used ptes within the page table */
- bitmap_set(pt->used_ptes,
- gen8_pte_index(pd_start),
- gen8_pte_count(pd_start, pd_len));
-
/* Our pde is now pointing to the pagetable, pt */
__set_bit(pde, pd->used_pdes);
I915_CACHE_LLC);
trace_i915_page_table_entry_map(&ppgtt->base, pde, pt,
gen8_pte_index(start),
- gen8_pte_count(start, length),
- GEN8_PTES);
+ gen8_pte_count(start, length));
/* NB: We haven't yet mapped ptes to pages. At this
* point we're still relying on insert_entries() */
gen8_setup_pdpe(ppgtt, pdp, pd, pdpe);
}
- free_gen8_temp_bitmaps(new_page_dirs, new_page_tables);
+ free_gen8_temp_bitmaps(new_page_dirs);
mark_tlbs_dirty(ppgtt);
return 0;
err_out:
- while (pdpe--) {
- unsigned long temp;
-
- for_each_set_bit(temp, new_page_tables + pdpe *
- BITS_TO_LONGS(I915_PDES), I915_PDES)
- free_pt(vm, pdp->page_directory[pdpe]->page_table[temp]);
- }
-
for_each_set_bit(pdpe, new_page_dirs, pdpes)
free_pd(vm, pdp->page_directory[pdpe]);
- free_gen8_temp_bitmaps(new_page_dirs, new_page_tables);
+ free_gen8_temp_bitmaps(new_page_dirs);
mark_tlbs_dirty(ppgtt);
return ret;
}
static int gen8_preallocate_top_level_pdps(struct i915_hw_ppgtt *ppgtt)
{
- unsigned long *new_page_dirs, *new_page_tables;
+ unsigned long *new_page_dirs;
uint32_t pdpes = I915_PDPES_PER_PDP(to_i915(ppgtt->base.dev));
int ret;
/* We allocate temp bitmap for page tables for no gain
* but as this is for init only, lets keep the things simple
*/
- ret = alloc_gen8_temp_bitmaps(&new_page_dirs, &new_page_tables, pdpes);
+ ret = alloc_gen8_temp_bitmaps(&new_page_dirs, pdpes);
if (ret)
return ret;
if (!ret)
*ppgtt->pdp.used_pdpes = *new_page_dirs;
- free_gen8_temp_bitmaps(new_page_dirs, new_page_tables);
+ free_gen8_temp_bitmaps(new_page_dirs);
return ret;
}
gen6_for_each_pde(pt, &ppgtt->pd, start, length, pde)
gen6_write_pde(ppgtt, pde, pt);
- wmb();
mark_tlbs_dirty(ppgtt);
+ wmb();
}
-static uint32_t get_pd_offset(struct i915_hw_ppgtt *ppgtt)
+static inline uint32_t get_pd_offset(struct i915_hw_ppgtt *ppgtt)
{
- BUG_ON(ppgtt->pd.base.ggtt_offset & 0x3f);
-
- return (ppgtt->pd.base.ggtt_offset / 64) << 16;
+ GEM_BUG_ON(ppgtt->pd.base.ggtt_offset & 0x3f);
+ return ppgtt->pd.base.ggtt_offset << 10;
}
static int hsw_mm_switch(struct i915_hw_ppgtt *ppgtt,
/* PPGTT support for Sandybdrige/Gen6 and later */
static void gen6_ppgtt_clear_range(struct i915_address_space *vm,
- uint64_t start,
- uint64_t length)
+ u64 start, u64 length)
{
struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
- gen6_pte_t *pt_vaddr, scratch_pte;
- unsigned first_entry = start >> PAGE_SHIFT;
- unsigned num_entries = length >> PAGE_SHIFT;
- unsigned act_pt = first_entry / GEN6_PTES;
- unsigned first_pte = first_entry % GEN6_PTES;
- unsigned last_pte, i;
-
- scratch_pte = vm->pte_encode(vm->scratch_page.daddr,
- I915_CACHE_LLC, 0);
+ unsigned int first_entry = start >> PAGE_SHIFT;
+ unsigned int pde = first_entry / GEN6_PTES;
+ unsigned int pte = first_entry % GEN6_PTES;
+ unsigned int num_entries = length >> PAGE_SHIFT;
+ gen6_pte_t scratch_pte =
+ vm->pte_encode(vm->scratch_page.daddr, I915_CACHE_LLC, 0);
while (num_entries) {
- last_pte = first_pte + num_entries;
- if (last_pte > GEN6_PTES)
- last_pte = GEN6_PTES;
+ struct i915_page_table *pt = ppgtt->pd.page_table[pde++];
+ unsigned int end = min(pte + num_entries, GEN6_PTES);
+ gen6_pte_t *vaddr;
- pt_vaddr = kmap_atomic_px(ppgtt->pd.page_table[act_pt]);
+ num_entries -= end - pte;
- for (i = first_pte; i < last_pte; i++)
- pt_vaddr[i] = scratch_pte;
+ /* Note that the hw doesn't support removing PDE on the fly
+ * (they are cached inside the context with no means to
+ * invalidate the cache), so we can only reset the PTE
+ * entries back to scratch.
+ */
- kunmap_atomic(pt_vaddr);
+ vaddr = kmap_atomic_px(pt);
+ do {
+ vaddr[pte++] = scratch_pte;
+ } while (pte < end);
+ kunmap_atomic(vaddr);
- num_entries -= last_pte - first_pte;
- first_pte = 0;
- act_pt++;
+ pte = 0;
}
}
}
static int gen6_alloc_va_range(struct i915_address_space *vm,
- uint64_t start_in, uint64_t length_in)
+ u64 start, u64 length)
{
- DECLARE_BITMAP(new_page_tables, I915_PDES);
- struct drm_i915_private *dev_priv = vm->i915;
- struct i915_ggtt *ggtt = &dev_priv->ggtt;
struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
struct i915_page_table *pt;
- uint32_t start, length, start_save, length_save;
- uint32_t pde;
- int ret;
-
- start = start_save = start_in;
- length = length_save = length_in;
-
- bitmap_zero(new_page_tables, I915_PDES);
+ u64 from = start;
+ unsigned int pde;
+ bool flush = false;
- /* The allocation is done in two stages so that we can bail out with
- * minimal amount of pain. The first stage finds new page tables that
- * need allocation. The second stage marks use ptes within the page
- * tables.
- */
gen6_for_each_pde(pt, &ppgtt->pd, start, length, pde) {
- if (pt != vm->scratch_pt) {
- WARN_ON(bitmap_empty(pt->used_ptes, GEN6_PTES));
- continue;
- }
-
- /* We've already allocated a page table */
- WARN_ON(!bitmap_empty(pt->used_ptes, GEN6_PTES));
+ if (pt == vm->scratch_pt) {
+ pt = alloc_pt(vm);
+ if (IS_ERR(pt))
+ goto unwind_out;
- pt = alloc_pt(vm);
- if (IS_ERR(pt)) {
- ret = PTR_ERR(pt);
- goto unwind_out;
+ gen6_initialize_pt(vm, pt);
+ ppgtt->pd.page_table[pde] = pt;
+ gen6_write_pde(ppgtt, pde, pt);
+ flush = true;
}
-
- gen6_initialize_pt(vm, pt);
-
- ppgtt->pd.page_table[pde] = pt;
- __set_bit(pde, new_page_tables);
- trace_i915_page_table_entry_alloc(vm, pde, start, GEN6_PDE_SHIFT);
}
- start = start_save;
- length = length_save;
-
- gen6_for_each_pde(pt, &ppgtt->pd, start, length, pde) {
- DECLARE_BITMAP(tmp_bitmap, GEN6_PTES);
-
- bitmap_zero(tmp_bitmap, GEN6_PTES);
- bitmap_set(tmp_bitmap, gen6_pte_index(start),
- gen6_pte_count(start, length));
-
- if (__test_and_clear_bit(pde, new_page_tables))
- gen6_write_pde(ppgtt, pde, pt);
-
- trace_i915_page_table_entry_map(vm, pde, pt,
- gen6_pte_index(start),
- gen6_pte_count(start, length),
- GEN6_PTES);
- bitmap_or(pt->used_ptes, tmp_bitmap, pt->used_ptes,
- GEN6_PTES);
+ if (flush) {
+ mark_tlbs_dirty(ppgtt);
+ wmb();
}
- WARN_ON(!bitmap_empty(new_page_tables, I915_PDES));
-
- /* Make sure write is complete before other code can use this page
- * table. Also require for WC mapped PTEs */
- readl(ggtt->gsm);
-
- mark_tlbs_dirty(ppgtt);
return 0;
unwind_out:
- for_each_set_bit(pde, new_page_tables, I915_PDES) {
- struct i915_page_table *pt = ppgtt->pd.page_table[pde];
-
- ppgtt->pd.page_table[pde] = vm->scratch_pt;
- free_pt(vm, pt);
- }
-
- mark_tlbs_dirty(ppgtt);
- return ret;
+ gen6_ppgtt_clear_range(vm, from, start);
+ return -ENOMEM;
}
static int gen6_init_scratch(struct i915_address_space *vm)
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