We currently assume we have struct pages for the backing storage of our
paging structures, however in the future we may also want to support
allocating storage from non-page backed memory, while still being able
to map it into the kernel address space for CPU access.
Signed-off-by: Matthew Auld <matthew.a...@intel.com>
Cc: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 109 +++++++++++++++++++++-------
drivers/gpu/drm/i915/i915_gem_gtt.h | 7 ++
2 files changed, 88 insertions(+), 28 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c
b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 1efe58ad0ce9..48b3b9e681c9 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -588,11 +588,20 @@ static void i915_address_space_init(struct
i915_address_space *vm, int subclass)
INIT_LIST_HEAD(&vm->bound_list);
}
-static int __setup_page_dma(struct i915_address_space *vm,
- struct i915_page_dma *p,
- gfp_t gfp)
+static void *kmap_page_dma_system(const struct i915_page_dma *p)
+{
+ return kmap_atomic(p->page);
+}
+
+static void kunmap_page_dma_system(void *vaddr)
+{
+ kunmap_atomic(vaddr);
+}
+
+static int setup_page_dma_system(struct i915_address_space *vm,
+ struct i915_page_dma *p)
{
- p->page = vm_alloc_page(vm, gfp | I915_GFP_ALLOW_FAIL);
+ p->page = vm_alloc_page(vm, __GFP_HIGHMEM | I915_GFP_ALLOW_FAIL);
if (unlikely(!p->page))
return -ENOMEM;
@@ -606,28 +615,54 @@ static int __setup_page_dma(struct i915_address_space *vm,
return -ENOMEM;
}
+ p->kmap = kmap_page_dma_system;
+ p->kunmap = kunmap_page_dma_system;
+
return 0;
}
+static void cleanup_page_dma_system(struct i915_address_space *vm,
+ struct i915_page_dma *p)
+{
+ dma_unmap_page(vm->dma, p->daddr, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
+ vm_free_page(vm, p->page);
+}
+
+static int __setup_page_dma(struct i915_address_space *vm,
+ struct i915_page_dma *p)
+{
+ return vm->setup_page_dma(vm, p);
+}
+
static int setup_page_dma(struct i915_address_space *vm,
struct i915_page_dma *p)
{
- return __setup_page_dma(vm, p, __GFP_HIGHMEM);
+ return __setup_page_dma(vm, p);
}
static void cleanup_page_dma(struct i915_address_space *vm,
struct i915_page_dma *p)
{
- dma_unmap_page(vm->dma, p->daddr, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
- vm_free_page(vm, p->page);
+ vm->cleanup_page_dma(vm, p);
}
-#define kmap_atomic_px(px) kmap_atomic(px_base(px)->page)
+static void kunmap_page_dma(const struct i915_page_dma *p, void *vaddr)
+{
+ p->kunmap(vaddr);
+}
+
+static void *kmap_page_dma(const struct i915_page_dma *p)
+{
+ return p->kmap(p);
+}
+
+#define kmap_atomic_px(px) kmap_page_dma(px_base(px))
+#define kunmap_atomic_px(px, vaddr) kunmap_page_dma(px_base(px), vaddr)
static void
fill_page_dma(const struct i915_page_dma *p, const u64 val, unsigned int count)
{
- kunmap_atomic(memset64(kmap_atomic(p->page), val, count));
+ kunmap_page_dma(p, memset64(kmap_page_dma(p), val, count));
}
#define fill_px(px, v) fill_page_dma(px_base(px), (v), PAGE_SIZE / sizeof(u64))
@@ -728,7 +763,7 @@ static struct i915_page_table *alloc_pt(struct
i915_address_space *vm)
{
struct i915_page_table *pt;
- pt = kmalloc(sizeof(*pt), I915_GFP_ALLOW_FAIL);
+ pt = kzalloc(sizeof(*pt), I915_GFP_ALLOW_FAIL);
if (unlikely(!pt))
return ERR_PTR(-ENOMEM);
@@ -782,10 +817,10 @@ write_dma_entry(struct i915_page_dma * const pdma,
const unsigned short idx,
const u64 encoded_entry)
{
- u64 * const vaddr = kmap_atomic(pdma->page);
+ u64 * const vaddr = kmap_page_dma(pdma);
vaddr[idx] = encoded_entry;
- kunmap_atomic(vaddr);
+ kunmap_page_dma(pdma, vaddr);
}
static inline void
@@ -1017,7 +1052,7 @@ static u64 __gen8_ppgtt_clear(struct i915_address_space *
const vm,
memset64(vaddr + gen8_pd_index(start, 0),
vm->scratch[0].encode,
count);
- kunmap_atomic(vaddr);
+ kunmap_atomic_px(pt, vaddr);
atomic_sub(count, &pt->used);
start += count;
@@ -1184,10 +1219,12 @@ gen8_ppgtt_insert_pte(struct i915_ppgtt *ppgtt,
{
struct i915_page_directory *pd;
const gen8_pte_t pte_encode = gen8_pte_encode(0, cache_level, flags);
+ struct i915_page_table *pt;
gen8_pte_t *vaddr;
pd = i915_pd_entry(pdp, gen8_pd_index(idx, 2));
- vaddr = kmap_atomic_px(i915_pt_entry(pd, gen8_pd_index(idx, 1)));
+ pt = i915_pt_entry(pd, gen8_pd_index(idx, 1));
+ vaddr = kmap_atomic_px(pt);
do {
vaddr[gen8_pd_index(idx, 0)] = pte_encode | iter->dma;
@@ -1212,11 +1249,12 @@ gen8_ppgtt_insert_pte(struct i915_ppgtt *ppgtt,
pd = pdp->entry[gen8_pd_index(idx, 2)];
}
- kunmap_atomic(vaddr);
- vaddr = kmap_atomic_px(i915_pt_entry(pd,
gen8_pd_index(idx, 1)));
+ kunmap_atomic_px(pt, vaddr);
+ pt = i915_pt_entry(pd, gen8_pd_index(idx, 1));
+ vaddr = kmap_atomic_px(pt);
}
} while (1);
- kunmap_atomic(vaddr);
+ kunmap_atomic_px(pt, vaddr);
return idx;
}
@@ -1237,6 +1275,7 @@ static void gen8_ppgtt_insert_huge(struct i915_vma *vma,
gen8_pdp_for_page_address(vma->vm, start);
struct i915_page_directory * const pd =
i915_pd_entry(pdp, __gen8_pte_index(start, 2));
+ struct i915_page_table *base;
gen8_pte_t encode = pte_encode;
unsigned int maybe_64K = -1;
unsigned int page_size;
@@ -1251,7 +1290,7 @@ static void gen8_ppgtt_insert_huge(struct i915_vma *vma,
encode |= GEN8_PDE_PS_2M;
page_size = I915_GTT_PAGE_SIZE_2M;
- vaddr = kmap_atomic_px(pd);
+ base = &pd->pt;
} else {
struct i915_page_table *pt =
i915_pt_entry(pd, __gen8_pte_index(start, 1));
@@ -1266,9 +1305,11 @@ static void gen8_ppgtt_insert_huge(struct i915_vma *vma,
rem >= (I915_PDES - index) * I915_GTT_PAGE_SIZE))
maybe_64K = __gen8_pte_index(start, 1);
- vaddr = kmap_atomic_px(pt);
+ base = pt;
}
+ vaddr = kmap_atomic_px(base);
+
do {
GEM_BUG_ON(iter->sg->length < page_size);
vaddr[index++] = encode | iter->dma;
@@ -1296,7 +1337,7 @@ static void gen8_ppgtt_insert_huge(struct i915_vma *vma,
}
} while (rem >= page_size && index < I915_PDES);
- kunmap_atomic(vaddr);
+ kunmap_atomic_px(base, vaddr);
/*
* Is it safe to mark the 2M block as 64K? -- Either we have
@@ -1312,7 +1353,7 @@ static void gen8_ppgtt_insert_huge(struct i915_vma *vma,
I915_GTT_PAGE_SIZE_2M)))) {
vaddr = kmap_atomic_px(pd);
vaddr[maybe_64K] |= GEN8_PDE_IPS_64K;
- kunmap_atomic(vaddr);
+ kunmap_atomic_px(pd, vaddr);
page_size = I915_GTT_PAGE_SIZE_64K;
/*
@@ -1325,15 +1366,17 @@ static void gen8_ppgtt_insert_huge(struct i915_vma *vma,
* selftests.
*/
if (I915_SELFTEST_ONLY(vma->vm->scrub_64K)) {
+ struct i915_page_table *pt =
+ i915_pt_entry(pd, maybe_64K);
u16 i;
encode = vma->vm->scratch[0].encode;
- vaddr = kmap_atomic_px(i915_pt_entry(pd,
maybe_64K));
+ vaddr = kmap_atomic_px(pt);
for (i = 1; i < index; i += 16)
memset64(vaddr + i, encode, 15);
- kunmap_atomic(vaddr);
+ kunmap_atomic_px(pt, vaddr);
}
}
@@ -1510,6 +1553,9 @@ static struct i915_ppgtt *gen8_ppgtt_create(struct
drm_i915_private *i915)
if (IS_CHERRYVIEW(i915) || IS_BROXTON(i915))
ppgtt->vm.pt_kmap_wc = true;
+ ppgtt->vm.setup_page_dma = setup_page_dma_system;
+ ppgtt->vm.cleanup_page_dma = cleanup_page_dma_system;
+
err = gen8_init_scratch(&ppgtt->vm);
if (err)
goto err_free;
@@ -1644,7 +1690,7 @@ static void gen6_ppgtt_clear_range(struct
i915_address_space *vm,
vaddr = kmap_atomic_px(pt);
memset32(vaddr + pte, scratch_pte, count);
- kunmap_atomic(vaddr);
+ kunmap_atomic_px(pt, vaddr);
pte = 0;
}
@@ -1662,11 +1708,13 @@ static void gen6_ppgtt_insert_entries(struct
i915_address_space *vm,
unsigned act_pte = first_entry % GEN6_PTES;
const u32 pte_encode = vm->pte_encode(0, cache_level, flags);
struct sgt_dma iter = sgt_dma(vma);
+ struct i915_page_table *pt;
gen6_pte_t *vaddr;
GEM_BUG_ON(pd->entry[act_pt] == &vm->scratch[1]);
- vaddr = kmap_atomic_px(i915_pt_entry(pd, act_pt));
+ pt = i915_pt_entry(pd, act_pt);
+ vaddr = kmap_atomic_px(pt);
do {
vaddr[act_pte] = pte_encode | GEN6_PTE_ADDR_ENCODE(iter.dma);
@@ -1681,12 +1729,14 @@ static void gen6_ppgtt_insert_entries(struct
i915_address_space *vm,
}
if (++act_pte == GEN6_PTES) {
- kunmap_atomic(vaddr);
- vaddr = kmap_atomic_px(i915_pt_entry(pd, ++act_pt));
+ kunmap_atomic_px(pt, vaddr);
+
+ pt = i915_pt_entry(pd, ++act_pt);
+ vaddr = kmap_atomic_px(pt);
act_pte = 0;
}
} while (1);
- kunmap_atomic(vaddr);
+ kunmap_atomic_px(pt, vaddr);
vma->page_sizes.gtt = I915_GTT_PAGE_SIZE;
}
@@ -1990,6 +2040,9 @@ static struct i915_ppgtt *gen6_ppgtt_create(struct
drm_i915_private *i915)
ppgtt->base.vm.pte_encode = ggtt->vm.pte_encode;
+ ppgtt->base.vm.setup_page_dma = setup_page_dma_system;
+ ppgtt->base.vm.cleanup_page_dma = cleanup_page_dma_system;
+
ppgtt->base.pd = __alloc_pd(sizeof(*ppgtt->base.pd));
if (!ppgtt->base.pd) {
err = -ENOMEM;
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h
b/drivers/gpu/drm/i915/i915_gem_gtt.h
index 31a4a96ddd0d..42ba96dffc3f 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -226,6 +226,9 @@ struct i915_page_dma {
*/
u32 ggtt_offset;
};
+
+ void *(*kmap)(const struct i915_page_dma *p);
+ void (*kunmap)(void *vaddr);
};
struct i915_page_scratch {
@@ -345,6 +348,10 @@ struct i915_address_space {
u32 flags); /* Create a valid PTE */
#define PTE_READ_ONLY (1<<0)
+ int (*setup_page_dma)(struct i915_address_space *vm,
+ struct i915_page_dma *p);
+ void (*cleanup_page_dma)(struct i915_address_space *vm,
+ struct i915_page_dma *p);
int (*allocate_va_range)(struct i915_address_space *vm,
u64 start, u64 length);
void (*clear_range)(struct i915_address_space *vm,
--
2.20.1
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