drm/nouveau/mmu: define user interfaces to mmu vmm opertaions

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

2 files changed, 168 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvif/Kbuild b/drivers/gpu/drm/nouveau/nvif/Kbuild
index 2e0a90b4dda8..f1675a4ab6fa 100644
--- a/drivers/gpu/drm/nouveau/nvif/Kbuild
+++ b/drivers/gpu/drm/nouveau/nvif/Kbuild
@@ -5,3 +5,4 @@ nvif-y += nvif/driver.o
 nvif-y += nvif/mem.o
 nvif-y += nvif/mmu.o
 nvif-y += nvif/notify.o
+nvif-y += nvif/vmm.o
diff --git a/drivers/gpu/drm/nouveau/nvif/vmm.c b/drivers/gpu/drm/nouveau/nvif/vmm.c
new file mode 100644
index 000000000000..31cdb2d2e1ff
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvif/vmm.c
@@ -0,0 +1,167 @@
+/*
+ * Copyright 2017 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.
+ */
+#include <nvif/vmm.h>
+#include <nvif/mem.h>
+
+#include <nvif/if000c.h>
+
+int
+nvif_vmm_unmap(struct nvif_vmm *vmm, u64 addr)
+{
+	return nvif_object_mthd(&vmm->object, NVIF_VMM_V0_UNMAP,
+				&(struct nvif_vmm_unmap_v0) { .addr = addr },
+				sizeof(struct nvif_vmm_unmap_v0));
+}
+
+int
+nvif_vmm_map(struct nvif_vmm *vmm, u64 addr, u64 size, void *argv, u32 argc,
+	     struct nvif_mem *mem, u64 offset)
+{
+	struct nvif_vmm_map_v0 *args;
+	u8 stack[16];
+	int ret;
+
+	if (sizeof(*args) + argc > sizeof(stack)) {
+		if (!(args = kmalloc(sizeof(*args) + argc, GFP_KERNEL)))
+			return -ENOMEM;
+	} else {
+		args = (void *)stack;
+	}
+
+	args->version = 0;
+	args->addr = addr;
+	args->size = size;
+	args->memory = nvif_handle(&mem->object);
+	args->offset = offset;
+	memcpy(args->data, argv, argc);
+
+	ret = nvif_object_mthd(&vmm->object, NVIF_VMM_V0_MAP,
+			       args, sizeof(*args) + argc);
+	if (args != (void *)stack)
+		kfree(args);
+	return ret;
+}
+
+void
+nvif_vmm_put(struct nvif_vmm *vmm, struct nvif_vma *vma)
+{
+	if (vma->size) {
+		WARN_ON(nvif_object_mthd(&vmm->object, NVIF_VMM_V0_PUT,
+					 &(struct nvif_vmm_put_v0) {
+						.addr = vma->addr,
+					 }, sizeof(struct nvif_vmm_put_v0)));
+		vma->size = 0;
+	}
+}
+
+int
+nvif_vmm_get(struct nvif_vmm *vmm, enum nvif_vmm_get type, bool sparse,
+	     u8 page, u8 align, u64 size, struct nvif_vma *vma)
+{
+	struct nvif_vmm_get_v0 args;
+	int ret;
+
+	args.version = vma->size = 0;
+	args.sparse = sparse;
+	args.page = page;
+	args.align = align;
+	args.size = size;
+
+	switch (type) {
+	case ADDR: args.type = NVIF_VMM_GET_V0_ADDR; break;
+	case PTES: args.type = NVIF_VMM_GET_V0_PTES; break;
+	case LAZY: args.type = NVIF_VMM_GET_V0_LAZY; break;
+	default:
+		WARN_ON(1);
+		return -EINVAL;
+	}
+
+	ret = nvif_object_mthd(&vmm->object, NVIF_VMM_V0_GET,
+			       &args, sizeof(args));
+	if (ret == 0) {
+		vma->addr = args.addr;
+		vma->size = args.size;
+	}
+	return ret;
+}
+
+void
+nvif_vmm_fini(struct nvif_vmm *vmm)
+{
+	kfree(vmm->page);
+	nvif_object_fini(&vmm->object);
+}
+
+int
+nvif_vmm_init(struct nvif_mmu *mmu, s32 oclass, u64 addr, u64 size,
+	      void *argv, u32 argc, struct nvif_vmm *vmm)
+{
+	struct nvif_vmm_v0 *args;
+	u32 argn = sizeof(*args) + argc;
+	int ret = -ENOSYS, i;
+
+	vmm->object.client = NULL;
+	vmm->page = NULL;
+
+	if (!(args = kmalloc(argn, GFP_KERNEL)))
+		return -ENOMEM;
+	args->version = 0;
+	args->addr = addr;
+	args->size = size;
+	memcpy(args->data, argv, argc);
+
+	ret = nvif_object_init(&mmu->object, 0, oclass, args, argn,
+			       &vmm->object);
+	if (ret)
+		goto done;
+
+	vmm->start = args->addr;
+	vmm->limit = args->size;
+
+	vmm->page_nr = args->page_nr;
+	vmm->page = kmalloc(sizeof(*vmm->page) * vmm->page_nr, GFP_KERNEL);
+	if (!vmm->page) {
+		ret = -ENOMEM;
+		goto done;
+	}
+
+	for (i = 0; i < vmm->page_nr; i++) {
+		struct nvif_vmm_page_v0 args = { .index = i };
+
+		ret = nvif_object_mthd(&vmm->object, NVIF_VMM_V0_PAGE,
+				       &args, sizeof(args));
+		if (ret)
+			break;
+
+		vmm->page[i].shift = args.shift;
+		vmm->page[i].sparse = args.sparse;
+		vmm->page[i].vram = args.vram;
+		vmm->page[i].host = args.host;
+		vmm->page[i].comp = args.comp;
+	}
+
+done:
+	if (ret)
+		nvif_vmm_fini(vmm);
+	kfree(args);
+	return ret;
+}