1 files changed, 483 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/vm/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/vm/base.c
new file mode 100644
index 000000000000..f75a683bd47a
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/vm/base.c
@@ -0,0 +1,483 @@
+/*
+ * 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 <core/gpuobj.h>
+#include <core/mm.h>
+
+#include <subdev/fb.h>
+#include <subdev/vm.h>
+
+void
+nouveau_vm_map_at(struct nouveau_vma *vma, u64 delta, struct nouveau_mem *node)
+{
+        struct nouveau_vm *vm = vma->vm;
+        struct nouveau_vmmgr *vmm = vm->vmm;
+        struct nouveau_mm_node *r;
+        int big = vma->node->type != vmm->spg_shift;
+        u32 offset = vma->node->offset + (delta >> 12);
+        u32 bits = vma->node->type - 12;
+        u32 pde  = (offset >> vmm->pgt_bits) - vm->fpde;
+        u32 pte  = (offset & ((1 << vmm->pgt_bits) - 1)) >> bits;
+        u32 max  = 1 << (vmm->pgt_bits - bits);
+        u32 end, len;
+
+        delta = 0;
+        list_for_each_entry(r, &node->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;
+
+                        vmm->map(vma, pgt, node, pte, len, phys, delta);
+
+                        num -= len;
+                        pte += len;
+                        if (unlikely(end >= max)) {
+                                phys += len << (bits + 12);
+                                pde++;
+                                pte = 0;
+                        }
+
+                        delta += (u64)len << vma->node->type;
+                }
+        }
+
+        vmm->flush(vm);
+}
+
+static void
+nouveau_vm_map_sg_table(struct nouveau_vma *vma, u64 delta, u64 length,
+                        struct nouveau_mem *mem)
+{
+        struct nouveau_vm *vm = vma->vm;
+        struct nouveau_vmmgr *vmm = vm->vmm;
+        int big = vma->node->type != vmm->spg_shift;
+        u32 offset = vma->node->offset + (delta >> 12);
+        u32 bits = vma->node->type - 12;
+        u32 num  = length >> vma->node->type;
+        u32 pde  = (offset >> vmm->pgt_bits) - vm->fpde;
+        u32 pte  = (offset & ((1 << vmm->pgt_bits) - 1)) >> bits;
+        u32 max  = 1 << (vmm->pgt_bits - bits);
+        unsigned m, sglen;
+        u32 end, len;
+        int i;
+        struct scatterlist *sg;
+
+        for_each_sg(mem->sg->sgl, sg, mem->sg->nents, i) {
+                struct nouveau_gpuobj *pgt = vm->pgt[pde].obj[big];
+                sglen = sg_dma_len(sg) >> PAGE_SHIFT;
+
+                end = pte + sglen;
+                if (unlikely(end >= max))
+                        end = max;
+                len = end - pte;
+
+                for (m = 0; m < len; m++) {
+                        dma_addr_t addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
+
+                        vmm->map_sg(vma, pgt, mem, pte, 1, &addr);
+                        num--;
+                        pte++;
+
+                        if (num == 0)
+                                goto finish;
+                }
+                if (unlikely(end >= max)) {
+                        pde++;
+                        pte = 0;
+                }
+                if (m < sglen) {
+                        for (; m < sglen; m++) {
+                                dma_addr_t addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
+
+                                vmm->map_sg(vma, pgt, mem, pte, 1, &addr);
+                                num--;
+                                pte++;
+                                if (num == 0)
+                                        goto finish;
+                        }
+                }
+
+        }
+finish:
+        vmm->flush(vm);
+}
+
+static void
+nouveau_vm_map_sg(struct nouveau_vma *vma, u64 delta, u64 length,
+                  struct nouveau_mem *mem)
+{
+        struct nouveau_vm *vm = vma->vm;
+        struct nouveau_vmmgr *vmm = vm->vmm;
+        dma_addr_t *list = mem->pages;
+        int big = vma->node->type != vmm->spg_shift;
+        u32 offset = vma->node->offset + (delta >> 12);
+        u32 bits = vma->node->type - 12;
+        u32 num  = length >> vma->node->type;
+        u32 pde  = (offset >> vmm->pgt_bits) - vm->fpde;
+        u32 pte  = (offset & ((1 << vmm->pgt_bits) - 1)) >> bits;
+        u32 max  = 1 << (vmm->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;
+
+                vmm->map_sg(vma, pgt, mem, pte, len, list);
+
+                num  -= len;
+                pte  += len;
+                list += len;
+                if (unlikely(end >= max)) {
+                        pde++;
+                        pte = 0;
+                }
+        }
+
+        vmm->flush(vm);
+}
+
+void
+nouveau_vm_map(struct nouveau_vma *vma, struct nouveau_mem *node)
+{
+        if (node->sg)
+                nouveau_vm_map_sg_table(vma, 0, node->size << 12, node);
+        else
+        if (node->pages)
+                nouveau_vm_map_sg(vma, 0, node->size << 12, node);
+        else
+                nouveau_vm_map_at(vma, 0, node);
+}
+
+void
+nouveau_vm_unmap_at(struct nouveau_vma *vma, u64 delta, u64 length)
+{
+        struct nouveau_vm *vm = vma->vm;
+        struct nouveau_vmmgr *vmm = vm->vmm;
+        int big = vma->node->type != vmm->spg_shift;
+        u32 offset = vma->node->offset + (delta >> 12);
+        u32 bits = vma->node->type - 12;
+        u32 num  = length >> vma->node->type;
+        u32 pde  = (offset >> vmm->pgt_bits) - vm->fpde;
+        u32 pte  = (offset & ((1 << vmm->pgt_bits) - 1)) >> bits;
+        u32 max  = 1 << (vmm->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;
+
+                vmm->unmap(pgt, pte, len);
+
+                num -= len;
+                pte += len;
+                if (unlikely(end >= max)) {
+                        pde++;
+                        pte = 0;
+                }
+        }
+
+        vmm->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_vmmgr *vmm = vm->vmm;
+        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) {
+                        vmm->map_pgt(vpgd->obj, pde, vpgt->obj);
+                }
+
+                mutex_unlock(&nv_subdev(vmm)->mutex);
+                nouveau_gpuobj_ref(NULL, &pgt);
+                mutex_lock(&nv_subdev(vmm)->mutex);
+        }
+}
+
+static int
+nouveau_vm_map_pgt(struct nouveau_vm *vm, u32 pde, u32 type)
+{
+        struct nouveau_vmmgr *vmm = vm->vmm;
+        struct nouveau_vm_pgt *vpgt = &vm->pgt[pde - vm->fpde];
+        struct nouveau_vm_pgd *vpgd;
+        struct nouveau_gpuobj *pgt;
+        int big = (type != vmm->spg_shift);
+        u32 pgt_size;
+        int ret;
+
+        pgt_size  = (1 << (vmm->pgt_bits + 12)) >> type;
+        pgt_size *= 8;
+
+        mutex_unlock(&nv_subdev(vmm)->mutex);
+        ret = nouveau_gpuobj_new(nv_object(vm->vmm), NULL, pgt_size, 0x1000,
+                                 NVOBJ_FLAG_ZERO_ALLOC, &pgt);
+        mutex_lock(&nv_subdev(vmm)->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(&nv_subdev(vmm)->mutex);
+                nouveau_gpuobj_ref(NULL, &pgt);
+                mutex_lock(&nv_subdev(vmm)->mutex);
+                return 0;
+        }
+
+        vpgt->obj[big] = pgt;
+        list_for_each_entry(vpgd, &vm->pgd_list, head) {
+                vmm->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)
+{
+        struct nouveau_vmmgr *vmm = vm->vmm;
+        u32 align = (1 << page_shift) >> 12;
+        u32 msize = size >> 12;
+        u32 fpde, lpde, pde;
+        int ret;
+
+        mutex_lock(&nv_subdev(vmm)->mutex);
+        ret = nouveau_mm_head(&vm->mm, 0, page_shift, msize, msize, align,
+                             &vma->node);
+        if (unlikely(ret != 0)) {
+                mutex_unlock(&nv_subdev(vmm)->mutex);
+                return ret;
+        }
+
+        fpde = (vma->node->offset >> vmm->pgt_bits);
+        lpde = (vma->node->offset + vma->node->length - 1) >> vmm->pgt_bits;
+
+        for (pde = fpde; pde <= lpde; pde++) {
+                struct nouveau_vm_pgt *vpgt = &vm->pgt[pde - vm->fpde];
+                int big = (vma->node->type != vmm->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_free(&vm->mm, &vma->node);
+                        mutex_unlock(&nv_subdev(vmm)->mutex);
+                        return ret;
+                }
+        }
+        mutex_unlock(&nv_subdev(vmm)->mutex);
+
+        vma->vm = NULL;
+        nouveau_vm_ref(vm, &vma->vm, NULL);
+        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;
+        struct nouveau_vmmgr *vmm = vm->vmm;
+        u32 fpde, lpde;
+
+        if (unlikely(vma->node == NULL))
+                return;
+        fpde = (vma->node->offset >> vmm->pgt_bits);
+        lpde = (vma->node->offset + vma->node->length - 1) >> vmm->pgt_bits;
+
+        mutex_lock(&nv_subdev(vmm)->mutex);
+        nouveau_vm_unmap_pgt(vm, vma->node->type != vmm->spg_shift, fpde, lpde);
+        nouveau_mm_free(&vm->mm, &vma->node);
+        mutex_unlock(&nv_subdev(vmm)->mutex);
+
+        nouveau_vm_ref(NULL, &vma->vm, NULL);
+}
+
+int
+nouveau_vm_create(struct nouveau_vmmgr *vmm, u64 offset, u64 length,
+                  u64 mm_offset, u32 block, struct nouveau_vm **pvm)
+{
+        struct nouveau_vm *vm;
+        u64 mm_length = (offset + length) - mm_offset;
+        int ret;
+
+        vm = kzalloc(sizeof(*vm), GFP_KERNEL);
+        if (!vm)
+                return -ENOMEM;
+
+        INIT_LIST_HEAD(&vm->pgd_list);
+        vm->vmm = vmm;
+        kref_init(&vm->refcount);
+        vm->fpde = offset >> (vmm->pgt_bits + 12);
+        vm->lpde = (offset + length - 1) >> (vmm->pgt_bits + 12);
+
+        vm->pgt  = vzalloc((vm->lpde - vm->fpde + 1) * sizeof(*vm->pgt));
+        if (!vm->pgt) {
+                kfree(vm);
+                return -ENOMEM;
+        }
+
+        ret = nouveau_mm_init(&vm->mm, mm_offset >> 12, mm_length >> 12,
+                              block >> 12);
+        if (ret) {
+                vfree(vm->pgt);
+                kfree(vm);
+                return ret;
+        }
+
+        *pvm = vm;
+
+        return 0;
+}
+
+int
+nouveau_vm_new(struct nouveau_device *device, u64 offset, u64 length,
+               u64 mm_offset, struct nouveau_vm **pvm)
+{
+        struct nouveau_vmmgr *vmm = nouveau_vmmgr(device);
+        return vmm->create(vmm, offset, length, mm_offset, pvm);
+}
+
+static int
+nouveau_vm_link(struct nouveau_vm *vm, struct nouveau_gpuobj *pgd)
+{
+        struct nouveau_vmmgr *vmm = vm->vmm;
+        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(&nv_subdev(vmm)->mutex);
+        for (i = vm->fpde; i <= vm->lpde; i++)
+                vmm->map_pgt(pgd, i, vm->pgt[i - vm->fpde].obj);
+        list_add(&vpgd->head, &vm->pgd_list);
+        mutex_unlock(&nv_subdev(vmm)->mutex);
+        return 0;
+}
+
+static void
+nouveau_vm_unlink(struct nouveau_vm *vm, struct nouveau_gpuobj *mpgd)
+{
+        struct nouveau_vmmgr *vmm = vm->vmm;
+        struct nouveau_vm_pgd *vpgd, *tmp;
+        struct nouveau_gpuobj *pgd = NULL;
+
+        if (!mpgd)
+                return;
+
+        mutex_lock(&nv_subdev(vmm)->mutex);
+        list_for_each_entry_safe(vpgd, tmp, &vm->pgd_list, head) {
+                if (vpgd->obj == mpgd) {
+                        pgd = vpgd->obj;
+                        list_del(&vpgd->head);
+                        kfree(vpgd);
+                        break;
+                }
+        }
+        mutex_unlock(&nv_subdev(vmm)->mutex);
+
+        nouveau_gpuobj_ref(NULL, &pgd);
+}
+
+static void
+nouveau_vm_del(struct kref *kref)
+{
+        struct nouveau_vm *vm = container_of(kref, typeof(*vm), refcount);
+        struct nouveau_vm_pgd *vpgd, *tmp;
+
+        list_for_each_entry_safe(vpgd, tmp, &vm->pgd_list, head) {
+                nouveau_vm_unlink(vm, vpgd->obj);
+        }
+
+        nouveau_mm_fini(&vm->mm);
+        vfree(vm->pgt);
+        kfree(vm);
+}
+
+int
+nouveau_vm_ref(struct nouveau_vm *ref, struct nouveau_vm **ptr,
+               struct nouveau_gpuobj *pgd)
+{
+        if (ref) {
+                int ret = nouveau_vm_link(ref, pgd);
+                if (ret)
+                        return ret;
+
+                kref_get(&ref->refcount);
+        }
+
+        if (*ptr) {
+                nouveau_vm_unlink(*ptr, pgd);
+                kref_put(&(*ptr)->refcount, nouveau_vm_del);
+        }
+
+        *ptr = ref;
+        return 0;
+}