1 files changed, 439 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_vm.c b/drivers/gpu/drm/nouveau/nouveau_vm.c
new file mode 100644
index 00000000000..97d82aedf86
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_vm.c
@@ -0,0 +1,439 @@
+/*
+ * Copyright 2010 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs
+ */
+
+#include "drmP.h"
+#include "nouveau_drv.h"
+#include "nouveau_mm.h"
+#include "nouveau_vm.h"
+
+void
+nouveau_vm_map_at(struct nouveau_vma *vma, u64 delta, struct nouveau_vram *vram)
+{
+	struct nouveau_vm *vm = vma->vm;
+	struct nouveau_mm_node *r;
+	int big = vma->node->type != vm->spg_shift;
+	u32 offset = vma->node->offset + (delta >> 12);
+	u32 bits = vma->node->type - 12;
+	u32 pde  = (offset >> vm->pgt_bits) - vm->fpde;
+	u32 pte  = (offset & ((1 << vm->pgt_bits) - 1)) >> bits;
+	u32 max  = 1 << (vm->pgt_bits - bits);
+	u32 end, len;
+
+	list_for_each_entry(r, &vram->regions, rl_entry) {
+		u64 phys = (u64)r->offset << 12;
+		u32 num  = r->length >> bits;
+
+		while (num) {
+			struct nouveau_gpuobj *pgt = vm->pgt[pde].obj[big];
+
+			end = (pte + num);
+			if (unlikely(end >= max))
+				end = max;
+			len = end - pte;
+
+			vm->map(vma, pgt, vram, pte, len, phys);
+
+			num -= len;
+			pte += len;
+			if (unlikely(end >= max)) {
+				pde++;
+				pte = 0;
+			}
+		}
+	}
+
+	vm->flush(vm);
+}
+
+void
+nouveau_vm_map(struct nouveau_vma *vma, struct nouveau_vram *vram)
+{
+	nouveau_vm_map_at(vma, 0, vram);
+}
+
+void
+nouveau_vm_map_sg(struct nouveau_vma *vma, u64 delta, u64 length,
+		  dma_addr_t *list)
+{
+	struct nouveau_vm *vm = vma->vm;
+	int big = vma->node->type != vm->spg_shift;
+	u32 offset = vma->node->offset + (delta >> 12);
+	u32 bits = vma->node->type - 12;
+	u32 num  = length >> vma->node->type;
+	u32 pde  = (offset >> vm->pgt_bits) - vm->fpde;
+	u32 pte  = (offset & ((1 << vm->pgt_bits) - 1)) >> bits;
+	u32 max  = 1 << (vm->pgt_bits - bits);
+	u32 end, len;
+
+	while (num) {
+		struct nouveau_gpuobj *pgt = vm->pgt[pde].obj[big];
+
+		end = (pte + num);
+		if (unlikely(end >= max))
+			end = max;
+		len = end - pte;
+
+		vm->map_sg(vma, pgt, pte, list, len);
+
+		num  -= len;
+		pte  += len;
+		list += len;
+		if (unlikely(end >= max)) {
+			pde++;
+			pte = 0;
+		}
+	}
+
+	vm->flush(vm);
+}
+
+void
+nouveau_vm_unmap_at(struct nouveau_vma *vma, u64 delta, u64 length)
+{
+	struct nouveau_vm *vm = vma->vm;
+	int big = vma->node->type != vm->spg_shift;
+	u32 offset = vma->node->offset + (delta >> 12);
+	u32 bits = vma->node->type - 12;
+	u32 num  = length >> vma->node->type;
+	u32 pde  = (offset >> vm->pgt_bits) - vm->fpde;
+	u32 pte  = (offset & ((1 << vm->pgt_bits) - 1)) >> bits;
+	u32 max  = 1 << (vm->pgt_bits - bits);
+	u32 end, len;
+
+	while (num) {
+		struct nouveau_gpuobj *pgt = vm->pgt[pde].obj[big];
+
+		end = (pte + num);
+		if (unlikely(end >= max))
+			end = max;
+		len = end - pte;
+
+		vm->unmap(pgt, pte, len);
+
+		num -= len;
+		pte += len;
+		if (unlikely(end >= max)) {
+			pde++;
+			pte = 0;
+		}
+	}
+
+	vm->flush(vm);
+}
+
+void
+nouveau_vm_unmap(struct nouveau_vma *vma)
+{
+	nouveau_vm_unmap_at(vma, 0, (u64)vma->node->length << 12);
+}
+
+static void
+nouveau_vm_unmap_pgt(struct nouveau_vm *vm, int big, u32 fpde, u32 lpde)
+{
+	struct nouveau_vm_pgd *vpgd;
+	struct nouveau_vm_pgt *vpgt;
+	struct nouveau_gpuobj *pgt;
+	u32 pde;
+
+	for (pde = fpde; pde <= lpde; pde++) {
+		vpgt = &vm->pgt[pde - vm->fpde];
+		if (--vpgt->refcount[big])
+			continue;
+
+		pgt = vpgt->obj[big];
+		vpgt->obj[big] = NULL;
+
+		list_for_each_entry(vpgd, &vm->pgd_list, head) {
+			vm->map_pgt(vpgd->obj, pde, vpgt->obj);
+		}
+
+		mutex_unlock(&vm->mm->mutex);
+		nouveau_gpuobj_ref(NULL, &pgt);
+		mutex_lock(&vm->mm->mutex);
+	}
+}
+
+static int
+nouveau_vm_map_pgt(struct nouveau_vm *vm, u32 pde, u32 type)
+{
+	struct nouveau_vm_pgt *vpgt = &vm->pgt[pde - vm->fpde];
+	struct nouveau_vm_pgd *vpgd;
+	struct nouveau_gpuobj *pgt;
+	int big = (type != vm->spg_shift);
+	u32 pgt_size;
+	int ret;
+
+	pgt_size  = (1 << (vm->pgt_bits + 12)) >> type;
+	pgt_size *= 8;
+
+	mutex_unlock(&vm->mm->mutex);
+	ret = nouveau_gpuobj_new(vm->dev, NULL, pgt_size, 0x1000,
+				 NVOBJ_FLAG_ZERO_ALLOC, &pgt);
+	mutex_lock(&vm->mm->mutex);
+	if (unlikely(ret))
+		return ret;
+
+	/* someone beat us to filling the PDE while we didn't have the lock */
+	if (unlikely(vpgt->refcount[big]++)) {
+		mutex_unlock(&vm->mm->mutex);
+		nouveau_gpuobj_ref(NULL, &pgt);
+		mutex_lock(&vm->mm->mutex);
+		return 0;
+	}
+
+	vpgt->obj[big] = pgt;
+	list_for_each_entry(vpgd, &vm->pgd_list, head) {
+		vm->map_pgt(vpgd->obj, pde, vpgt->obj);
+	}
+
+	return 0;
+}
+
+int
+nouveau_vm_get(struct nouveau_vm *vm, u64 size, u32 page_shift,
+	       u32 access, struct nouveau_vma *vma)
+{
+	u32 align = (1 << page_shift) >> 12;
+	u32 msize = size >> 12;
+	u32 fpde, lpde, pde;
+	int ret;
+
+	mutex_lock(&vm->mm->mutex);
+	ret = nouveau_mm_get(vm->mm, page_shift, msize, 0, align, &vma->node);
+	if (unlikely(ret != 0)) {
+		mutex_unlock(&vm->mm->mutex);
+		return ret;
+	}
+
+	fpde = (vma->node->offset >> vm->pgt_bits);
+	lpde = (vma->node->offset + vma->node->length - 1) >> vm->pgt_bits;
+	for (pde = fpde; pde <= lpde; pde++) {
+		struct nouveau_vm_pgt *vpgt = &vm->pgt[pde - vm->fpde];
+		int big = (vma->node->type != vm->spg_shift);
+
+		if (likely(vpgt->refcount[big])) {
+			vpgt->refcount[big]++;
+			continue;
+		}
+
+		ret = nouveau_vm_map_pgt(vm, pde, vma->node->type);
+		if (ret) {
+			if (pde != fpde)
+				nouveau_vm_unmap_pgt(vm, big, fpde, pde - 1);
+			nouveau_mm_put(vm->mm, vma->node);
+			mutex_unlock(&vm->mm->mutex);
+			vma->node = NULL;
+			return ret;
+		}
+	}
+	mutex_unlock(&vm->mm->mutex);
+
+	vma->vm     = vm;
+	vma->offset = (u64)vma->node->offset << 12;
+	vma->access = access;
+	return 0;
+}
+
+void
+nouveau_vm_put(struct nouveau_vma *vma)
+{
+	struct nouveau_vm *vm = vma->vm;
+	u32 fpde, lpde;
+
+	if (unlikely(vma->node == NULL))
+		return;
+	fpde = (vma->node->offset >> vm->pgt_bits);
+	lpde = (vma->node->offset + vma->node->length - 1) >> vm->pgt_bits;
+
+	mutex_lock(&vm->mm->mutex);
+	nouveau_vm_unmap_pgt(vm, vma->node->type != vm->spg_shift, fpde, lpde);
+	nouveau_mm_put(vm->mm, vma->node);
+	vma->node = NULL;
+	mutex_unlock(&vm->mm->mutex);
+}
+
+int
+nouveau_vm_new(struct drm_device *dev, u64 offset, u64 length, u64 mm_offset,
+	       struct nouveau_vm **pvm)
+{
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+	struct nouveau_vm *vm;
+	u64 mm_length = (offset + length) - mm_offset;
+	u32 block, pgt_bits;
+	int ret;
+
+	vm = kzalloc(sizeof(*vm), GFP_KERNEL);
+	if (!vm)
+		return -ENOMEM;
+
+	if (dev_priv->card_type == NV_50) {
+		vm->map_pgt = nv50_vm_map_pgt;
+		vm->map = nv50_vm_map;
+		vm->map_sg = nv50_vm_map_sg;
+		vm->unmap = nv50_vm_unmap;
+		vm->flush = nv50_vm_flush;
+		vm->spg_shift = 12;
+		vm->lpg_shift = 16;
+
+		pgt_bits = 29;
+		block = (1 << pgt_bits);
+		if (length < block)
+			block = length;
+
+	} else
+	if (dev_priv->card_type == NV_C0) {
+		vm->map_pgt = nvc0_vm_map_pgt;
+		vm->map = nvc0_vm_map;
+		vm->map_sg = nvc0_vm_map_sg;
+		vm->unmap = nvc0_vm_unmap;
+		vm->flush = nvc0_vm_flush;
+		vm->spg_shift = 12;
+		vm->lpg_shift = 17;
+		pgt_bits = 27;
+
+		/* Should be 4096 everywhere, this is a hack that's
+		 * currently necessary to avoid an elusive bug that
+		 * causes corruption when mixing small/large pages
+		 */
+		if (length < (1ULL << 40))
+			block = 4096;
+		else {
+			block = (1 << pgt_bits);
+			if (length < block)
+				block = length;
+		}
+	} else {
+		kfree(vm);
+		return -ENOSYS;
+	}
+
+	vm->fpde   = offset >> pgt_bits;
+	vm->lpde   = (offset + length - 1) >> pgt_bits;
+	vm->pgt = kcalloc(vm->lpde - vm->fpde + 1, sizeof(*vm->pgt), GFP_KERNEL);
+	if (!vm->pgt) {
+		kfree(vm);
+		return -ENOMEM;
+	}
+
+	INIT_LIST_HEAD(&vm->pgd_list);
+	vm->dev = dev;
+	vm->refcount = 1;
+	vm->pgt_bits = pgt_bits - 12;
+
+	ret = nouveau_mm_init(&vm->mm, mm_offset >> 12, mm_length >> 12,
+			      block >> 12);
+	if (ret) {
+		kfree(vm);
+		return ret;
+	}
+
+	*pvm = vm;
+	return 0;
+}
+
+static int
+nouveau_vm_link(struct nouveau_vm *vm, struct nouveau_gpuobj *pgd)
+{
+	struct nouveau_vm_pgd *vpgd;
+	int i;
+
+	if (!pgd)
+		return 0;
+
+	vpgd = kzalloc(sizeof(*vpgd), GFP_KERNEL);
+	if (!vpgd)
+		return -ENOMEM;
+
+	nouveau_gpuobj_ref(pgd, &vpgd->obj);
+
+	mutex_lock(&vm->mm->mutex);
+	for (i = vm->fpde; i <= vm->lpde; i++)
+		vm->map_pgt(pgd, i, vm->pgt[i - vm->fpde].obj);
+	list_add(&vpgd->head, &vm->pgd_list);
+	mutex_unlock(&vm->mm->mutex);
+	return 0;
+}
+
+static void
+nouveau_vm_unlink(struct nouveau_vm *vm, struct nouveau_gpuobj *pgd)
+{
+	struct nouveau_vm_pgd *vpgd, *tmp;
+
+	if (!pgd)
+		return;
+
+	mutex_lock(&vm->mm->mutex);
+	list_for_each_entry_safe(vpgd, tmp, &vm->pgd_list, head) {
+		if (vpgd->obj != pgd)
+			continue;
+
+		list_del(&vpgd->head);
+		nouveau_gpuobj_ref(NULL, &vpgd->obj);
+		kfree(vpgd);
+	}
+	mutex_unlock(&vm->mm->mutex);
+}
+
+static void
+nouveau_vm_del(struct nouveau_vm *vm)
+{
+	struct nouveau_vm_pgd *vpgd, *tmp;
+
+	list_for_each_entry_safe(vpgd, tmp, &vm->pgd_list, head) {
+		nouveau_vm_unlink(vm, vpgd->obj);
+	}
+	WARN_ON(nouveau_mm_fini(&vm->mm) != 0);
+
+	kfree(vm->pgt);
+	kfree(vm);
+}
+
+int
+nouveau_vm_ref(struct nouveau_vm *ref, struct nouveau_vm **ptr,
+	       struct nouveau_gpuobj *pgd)
+{
+	struct nouveau_vm *vm;
+	int ret;
+
+	vm = ref;
+	if (vm) {
+		ret = nouveau_vm_link(vm, pgd);
+		if (ret)
+			return ret;
+
+		vm->refcount++;
+	}
+
+	vm = *ptr;
+	*ptr = ref;
+
+	if (vm) {
+		nouveau_vm_unlink(vm, pgd);
+
+		if (--vm->refcount == 0)
+			nouveau_vm_del(vm);
+	}
+
+	return 0;
+}