[Intel-gfx] [PATCH v6 25/32] drm/i915/bdw: implement alloc/free for 4lvl
Michel Thierry
michel.thierry at intel.com
Tue Feb 24 08:22:58 PST 2015
From: Ben Widawsky <benjamin.widawsky at intel.com>
The code for 4lvl works just as one would expect, and nicely it is able
to call into the existing 3lvl page table code to handle all of the
lower levels.
PML4 has no special attributes, and there will always be a PML4.
So simply initialize it at creation, and destroy it at the end.
v2: Return something at the end of gen8_alloc_va_range_4lvl to keep the
compiler happy. And define ret only in one place.
Updated gen8_ppgtt_unmap_pages and gen8_ppgtt_free to handle 4lvl.
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 | 240 +++++++++++++++++++++++++++++++-----
drivers/gpu/drm/i915/i915_gem_gtt.h | 11 +-
2 files changed, 217 insertions(+), 34 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 9f16db7..4c921d0 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -483,9 +483,12 @@ static void __pdp_fini(struct i915_page_directory_pointer_entry *pdp)
static void unmap_and_free_pdp(struct i915_page_directory_pointer_entry *pdp,
struct drm_device *dev)
{
- __pdp_fini(pdp);
- if (USES_FULL_48BIT_PPGTT(dev))
+ if (USES_FULL_48BIT_PPGTT(dev)) {
+ __pdp_fini(pdp);
+ i915_dma_unmap_single(pdp, dev);
+ __free_page(pdp->page);
kfree(pdp);
+ }
}
static int __pdp_init(struct i915_page_directory_pointer_entry *pdp,
@@ -511,6 +514,60 @@ static int __pdp_init(struct i915_page_directory_pointer_entry *pdp,
return 0;
}
+static struct i915_page_directory_pointer_entry *alloc_pdp_single(struct i915_hw_ppgtt *ppgtt,
+ struct i915_pml4 *pml4)
+{
+ struct drm_device *dev = ppgtt->base.dev;
+ struct i915_page_directory_pointer_entry *pdp;
+ int ret;
+
+ BUG_ON(!USES_FULL_48BIT_PPGTT(dev));
+
+ pdp = kmalloc(sizeof(*pdp), GFP_KERNEL);
+ if (!pdp)
+ return ERR_PTR(-ENOMEM);
+
+ pdp->page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
+ if (!pdp->page) {
+ kfree(pdp);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ ret = __pdp_init(pdp, dev);
+ if (ret) {
+ __free_page(pdp->page);
+ kfree(pdp);
+ return ERR_PTR(ret);
+ }
+
+ i915_dma_map_single(pdp, dev);
+
+ return pdp;
+}
+
+static void pml4_fini(struct i915_pml4 *pml4)
+{
+ struct i915_hw_ppgtt *ppgtt =
+ container_of(pml4, struct i915_hw_ppgtt, pml4);
+ i915_dma_unmap_single(pml4, ppgtt->base.dev);
+ __free_page(pml4->page);
+ /* HACK */
+ pml4->page = NULL;
+}
+
+static int pml4_init(struct i915_hw_ppgtt *ppgtt)
+{
+ struct i915_pml4 *pml4 = &ppgtt->pml4;
+
+ pml4->page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ if (!pml4->page)
+ return -ENOMEM;
+
+ i915_dma_map_single(pml4, ppgtt->base.dev);
+
+ return 0;
+}
+
/* Broadwell Page Directory Pointer Descriptors */
static int gen8_write_pdp(struct intel_engine_cs *ring,
unsigned entry,
@@ -712,14 +769,13 @@ static void gen8_free_page_tables(struct i915_page_directory_entry *pd, struct d
}
}
-static void gen8_ppgtt_unmap_pages(struct i915_hw_ppgtt *ppgtt)
+static void gen8_ppgtt_unmap_pages_3lvl(struct i915_page_directory_pointer_entry *pdp,
+ struct drm_device *dev)
{
- struct pci_dev *hwdev = ppgtt->base.dev->pdev;
- struct i915_page_directory_pointer_entry *pdp = &ppgtt->pdp; /* FIXME: 48b */
+ struct pci_dev *hwdev = dev->pdev;
int i, j;
- for_each_set_bit(i, pdp->used_pdpes,
- I915_PDPES_PER_PDP(ppgtt->base.dev)) {
+ for_each_set_bit(i, pdp->used_pdpes, I915_PDPES_PER_PDP(dev)) {
struct i915_page_directory_entry *pd;
if (WARN_ON(!pdp->page_directory[i]))
@@ -747,27 +803,73 @@ static void gen8_ppgtt_unmap_pages(struct i915_hw_ppgtt *ppgtt)
}
}
-static void gen8_ppgtt_free(struct i915_hw_ppgtt *ppgtt)
+static void gen8_ppgtt_unmap_pages_4lvl(struct i915_hw_ppgtt *ppgtt)
{
+ struct pci_dev *hwdev = ppgtt->base.dev->pdev;
int i;
- 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;
+ for_each_set_bit(i, ppgtt->pml4.used_pml4es, GEN8_PML4ES_PER_PML4) {
+ struct i915_page_directory_pointer_entry *pdp;
- 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 {
- BUG(); /* to be implemented later */
+ if (WARN_ON(!ppgtt->pml4.pdps[i]))
+ continue;
+
+ pdp = ppgtt->pml4.pdps[i];
+ if (!pdp->daddr)
+ pci_unmap_page(hwdev, pdp->daddr, PAGE_SIZE,
+ PCI_DMA_BIDIRECTIONAL);
+
+ gen8_ppgtt_unmap_pages_3lvl(ppgtt->pml4.pdps[i],
+ ppgtt->base.dev);
}
}
+static void gen8_ppgtt_unmap_pages(struct i915_hw_ppgtt *ppgtt)
+{
+ if (!USES_FULL_48BIT_PPGTT(ppgtt->base.dev))
+ gen8_ppgtt_unmap_pages_3lvl(&ppgtt->pdp, ppgtt->base.dev);
+ else
+ gen8_ppgtt_unmap_pages_4lvl(ppgtt);
+}
+
+static void gen8_ppgtt_free_3lvl(struct i915_page_directory_pointer_entry *pdp,
+ struct drm_device *dev)
+{
+ int i;
+
+ for_each_set_bit(i, pdp->used_pdpes, I915_PDPES_PER_PDP(dev)) {
+ if (WARN_ON(!pdp->page_directory[i]))
+ continue;
+
+ gen8_free_page_tables(pdp->page_directory[i], dev);
+ unmap_and_free_pd(pdp->page_directory[i], dev);
+ }
+
+ unmap_and_free_pdp(pdp, dev);
+}
+
+static void gen8_ppgtt_free_4lvl(struct i915_hw_ppgtt *ppgtt)
+{
+ int i;
+
+ for_each_set_bit(i, ppgtt->pml4.used_pml4es, GEN8_PML4ES_PER_PML4) {
+ if (WARN_ON(!ppgtt->pml4.pdps[i]))
+ continue;
+
+ gen8_ppgtt_free_3lvl(ppgtt->pml4.pdps[i], ppgtt->base.dev);
+ }
+
+ pml4_fini(&ppgtt->pml4);
+}
+
+static void gen8_ppgtt_free(struct i915_hw_ppgtt *ppgtt)
+{
+ if (!USES_FULL_48BIT_PPGTT(ppgtt->base.dev))
+ gen8_ppgtt_free_3lvl(&ppgtt->pdp, ppgtt->base.dev);
+ else
+ gen8_ppgtt_free_4lvl(ppgtt);
+}
+
static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
{
struct i915_hw_ppgtt *ppgtt =
@@ -1040,12 +1142,74 @@ err_out:
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)
+static int gen8_alloc_va_range_4lvl(struct i915_address_space *vm,
+ struct i915_pml4 *pml4,
+ uint64_t start,
+ uint64_t length)
{
- BUG(); /* to be implemented later */
+ DECLARE_BITMAP(new_pdps, GEN8_PML4ES_PER_PML4);
+ struct i915_hw_ppgtt *ppgtt =
+ container_of(vm, struct i915_hw_ppgtt, base);
+ struct i915_page_directory_pointer_entry *pdp;
+ const uint64_t orig_start = start;
+ const uint64_t orig_length = length;
+ uint64_t temp, pml4e;
+ int ret = 0;
+
+ /* Do the pml4 allocations first, so we don't need to track the newly
+ * allocated tables below the pdp */
+ bitmap_zero(new_pdps, GEN8_PML4ES_PER_PML4);
+
+ /* The page_directoryectory and pagetable allocations are done in the shared 3
+ * and 4 level code. Just allocate the pdps.
+ */
+ gen8_for_each_pml4e(pdp, pml4, start, length, temp, pml4e) {
+ if (!pdp) {
+ WARN_ON(test_bit(pml4e, pml4->used_pml4es));
+ pdp = alloc_pdp_single(ppgtt, pml4);
+ if (IS_ERR(pdp))
+ goto err_alloc;
+
+ pml4->pdps[pml4e] = pdp;
+ set_bit(pml4e, new_pdps);
+ trace_i915_page_directory_pointer_entry_alloc(&ppgtt->base, pml4e,
+ pml4e << GEN8_PML4E_SHIFT,
+ GEN8_PML4E_SHIFT);
+
+ }
+ }
+
+ WARN(bitmap_weight(new_pdps, GEN8_PML4ES_PER_PML4) > 2,
+ "The allocation has spanned more than 512GB. "
+ "It is highly likely this is incorrect.");
+
+ start = orig_start;
+ length = orig_length;
+
+ gen8_for_each_pml4e(pdp, pml4, start, length, temp, pml4e) {
+ BUG_ON(!pdp);
+
+ ret = gen8_alloc_va_range_3lvl(vm, pdp, start, length);
+ if (ret)
+ goto err_out;
+ }
+
+ bitmap_or(pml4->used_pml4es, new_pdps, pml4->used_pml4es,
+ GEN8_PML4ES_PER_PML4);
+
+ return 0;
+
+err_out:
+ start = orig_start;
+ length = orig_length;
+ gen8_for_each_pml4e(pdp, pml4, start, length, temp, pml4e)
+ gen8_ppgtt_free_3lvl(pdp, vm->dev);
+
+err_alloc:
+ for_each_set_bit(pml4e, new_pdps, GEN8_PML4ES_PER_PML4)
+ unmap_and_free_pdp(pdp, vm->dev);
+
+ return ret;
}
static int gen8_alloc_va_range(struct i915_address_space *vm,
@@ -1054,16 +1218,19 @@ static int gen8_alloc_va_range(struct i915_address_space *vm,
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
+ if (USES_FULL_48BIT_PPGTT(vm->dev))
return gen8_alloc_va_range_4lvl(vm, &ppgtt->pml4, start, length);
+ else
+ return gen8_alloc_va_range_3lvl(vm, &ppgtt->pdp, start, length);
}
static void gen8_ppgtt_fini_common(struct i915_hw_ppgtt *ppgtt)
{
unmap_and_free_pt(ppgtt->scratch_pd, ppgtt->base.dev);
- unmap_and_free_pdp(&ppgtt->pdp, ppgtt->base.dev);
+ if (USES_FULL_48BIT_PPGTT(ppgtt->base.dev))
+ pml4_fini(&ppgtt->pml4);
+ else
+ unmap_and_free_pdp(&ppgtt->pdp, ppgtt->base.dev);
}
/**
@@ -1086,14 +1253,21 @@ static int gen8_ppgtt_init_common(struct i915_hw_ppgtt *ppgtt, uint64_t size)
ppgtt->switch_mm = gen8_mm_switch;
- if (!USES_FULL_48BIT_PPGTT(ppgtt->base.dev)) {
+ if (USES_FULL_48BIT_PPGTT(ppgtt->base.dev)) {
+ int ret = pml4_init(ppgtt);
+ if (ret) {
+ unmap_and_free_pt(ppgtt->scratch_pd, ppgtt->base.dev);
+ return ret;
+ }
+ } else {
int ret = __pdp_init(&ppgtt->pdp, false);
if (ret) {
unmap_and_free_pt(ppgtt->scratch_pd, ppgtt->base.dev);
return ret;
}
- } else
- return -EPERM; /* Not yet implemented */
+
+ trace_i915_page_directory_pointer_entry_alloc(&ppgtt->base, 0, 0, GEN8_PML4E_SHIFT);
+ }
return 0;
}
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index f74afa6..3700f46 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -87,6 +87,7 @@ typedef gen8_gtt_pte_t gen8_ppgtt_pde_t;
*/
#define GEN8_PML4ES_PER_PML4 512
#define GEN8_PML4E_SHIFT 39
+#define GEN8_PML4E_MASK (GEN8_PML4ES_PER_PML4 - 1)
#define GEN8_PDPE_SHIFT 30
/* NB: GEN8_PDPE_MASK is untrue for 32b platforms, but it has no impact on 32b page
* tables */
@@ -427,6 +428,14 @@ static inline uint32_t gen6_pde_index(uint32_t addr)
temp = min(temp, length), \
start += temp, length -= temp)
+#define gen8_for_each_pml4e(pdp, pml4, start, length, temp, iter) \
+ for (iter = gen8_pml4e_index(start), pdp = (pml4)->pdps[iter]; \
+ length > 0 && iter < GEN8_PML4ES_PER_PML4; \
+ pdp = (pml4)->pdps[++iter], \
+ temp = ALIGN(start+1, 1ULL << GEN8_PML4E_SHIFT) - start, \
+ temp = min(temp, length), \
+ start += temp, length -= temp)
+
#define gen8_for_each_pdpe(pd, pdp, start, length, temp, iter) \
gen8_for_each_pdpe_e(pd, pdp, start, length, temp, iter, I915_PDPES_PER_PDP(dev))
@@ -458,7 +467,7 @@ static inline uint32_t gen8_pdpe_index(uint64_t address)
static inline uint32_t gen8_pml4e_index(uint64_t address)
{
- BUG(); /* For 64B */
+ return (address >> GEN8_PML4E_SHIFT) & GEN8_PML4E_MASK;
}
static inline size_t gen8_pte_count(uint64_t addr, uint64_t length)
--
2.1.1
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