Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 480 insertions, 0 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
new file mode 100644
index 000000000..185655f22
--- /dev/null
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -0,0 +1,480 @@
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * 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, sub license, 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 (including the
+ * next paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
+ */
+
+#define pr_fmt(fmt) "[TTM] " fmt
+
+#include <drm/ttm/ttm_module.h>
+#include <drm/ttm/ttm_bo_driver.h>
+#include <drm/ttm/ttm_placement.h>
+#include <drm/drm_vma_manager.h>
+#include <linux/mm.h>
+#include <linux/pfn_t.h>
+#include <linux/rbtree.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <linux/mem_encrypt.h>
+
+#define TTM_BO_VM_NUM_PREFAULT 16
+
+static vm_fault_t ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo,
+				struct vm_fault *vmf)
+{
+	vm_fault_t ret = 0;
+	int err = 0;
+
+	if (likely(!bo->moving))
+		goto out_unlock;
+
+	/*
+	 * Quick non-stalling check for idle.
+	 */
+	if (dma_fence_is_signaled(bo->moving))
+		goto out_clear;
+
+	/*
+	 * If possible, avoid waiting for GPU with mmap_sem
+	 * held.
+	 */
+	if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) {
+		ret = VM_FAULT_RETRY;
+		if (vmf->flags & FAULT_FLAG_RETRY_NOWAIT)
+			goto out_unlock;
+
+		ttm_bo_get(bo);
+		up_read(&vmf->vma->vm_mm->mmap_sem);
+		(void) dma_fence_wait(bo->moving, true);
+		ttm_bo_unreserve(bo);
+		ttm_bo_put(bo);
+		goto out_unlock;
+	}
+
+	/*
+	 * Ordinary wait.
+	 */
+	err = dma_fence_wait(bo->moving, true);
+	if (unlikely(err != 0)) {
+		ret = (err != -ERESTARTSYS) ? VM_FAULT_SIGBUS :
+			VM_FAULT_NOPAGE;
+		goto out_unlock;
+	}
+
+out_clear:
+	dma_fence_put(bo->moving);
+	bo->moving = NULL;
+
+out_unlock:
+	return ret;
+}
+
+static unsigned long ttm_bo_io_mem_pfn(struct ttm_buffer_object *bo,
+				       unsigned long page_offset)
+{
+	struct ttm_bo_device *bdev = bo->bdev;
+
+	if (bdev->driver->io_mem_pfn)
+		return bdev->driver->io_mem_pfn(bo, page_offset);
+
+	return ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT)
+		+ page_offset;
+}
+
+static vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
+{
+	struct vm_area_struct *vma = vmf->vma;
+	struct ttm_buffer_object *bo = (struct ttm_buffer_object *)
+	    vma->vm_private_data;
+	struct ttm_bo_device *bdev = bo->bdev;
+	unsigned long page_offset;
+	unsigned long page_last;
+	unsigned long pfn;
+	struct ttm_tt *ttm = NULL;
+	struct page *page;
+	int err;
+	int i;
+	vm_fault_t ret = VM_FAULT_NOPAGE;
+	unsigned long address = vmf->address;
+	struct ttm_mem_type_manager *man =
+		&bdev->man[bo->mem.mem_type];
+	struct vm_area_struct cvma;
+
+	/*
+	 * Work around locking order reversal in fault / nopfn
+	 * between mmap_sem and bo_reserve: Perform a trylock operation
+	 * for reserve, and if it fails, retry the fault after waiting
+	 * for the buffer to become unreserved.
+	 */
+	err = ttm_bo_reserve(bo, true, true, NULL);
+	if (unlikely(err != 0)) {
+		if (err != -EBUSY)
+			return VM_FAULT_NOPAGE;
+
+		if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) {
+			if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
+				ttm_bo_get(bo);
+				up_read(&vmf->vma->vm_mm->mmap_sem);
+				(void) ttm_bo_wait_unreserved(bo);
+				ttm_bo_put(bo);
+			}
+
+			return VM_FAULT_RETRY;
+		}
+
+		/*
+		 * If we'd want to change locking order to
+		 * mmap_sem -> bo::reserve, we'd use a blocking reserve here
+		 * instead of retrying the fault...
+		 */
+		return VM_FAULT_NOPAGE;
+	}
+
+	/*
+	 * Refuse to fault imported pages. This should be handled
+	 * (if at all) by redirecting mmap to the exporter.
+	 */
+	if (bo->ttm && (bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
+		ret = VM_FAULT_SIGBUS;
+		goto out_unlock;
+	}
+
+	if (bdev->driver->fault_reserve_notify) {
+		err = bdev->driver->fault_reserve_notify(bo);
+		switch (err) {
+		case 0:
+			break;
+		case -EBUSY:
+		case -ERESTARTSYS:
+			ret = VM_FAULT_NOPAGE;
+			goto out_unlock;
+		default:
+			ret = VM_FAULT_SIGBUS;
+			goto out_unlock;
+		}
+	}
+
+	/*
+	 * Wait for buffer data in transit, due to a pipelined
+	 * move.
+	 */
+	ret = ttm_bo_vm_fault_idle(bo, vmf);
+	if (unlikely(ret != 0)) {
+		if (ret == VM_FAULT_RETRY &&
+		    !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
+			/* The BO has already been unreserved. */
+			return ret;
+		}
+
+		goto out_unlock;
+	}
+
+	err = ttm_mem_io_lock(man, true);
+	if (unlikely(err != 0)) {
+		ret = VM_FAULT_NOPAGE;
+		goto out_unlock;
+	}
+	err = ttm_mem_io_reserve_vm(bo);
+	if (unlikely(err != 0)) {
+		ret = VM_FAULT_SIGBUS;
+		goto out_io_unlock;
+	}
+
+	page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
+		vma->vm_pgoff - drm_vma_node_start(&bo->vma_node);
+	page_last = vma_pages(vma) + vma->vm_pgoff -
+		drm_vma_node_start(&bo->vma_node);
+
+	if (unlikely(page_offset >= bo->num_pages)) {
+		ret = VM_FAULT_SIGBUS;
+		goto out_io_unlock;
+	}
+
+	/*
+	 * Make a local vma copy to modify the page_prot member
+	 * and vm_flags if necessary. The vma parameter is protected
+	 * by mmap_sem in write mode.
+	 */
+	cvma = *vma;
+	cvma.vm_page_prot = vm_get_page_prot(cvma.vm_flags);
+
+	if (bo->mem.bus.is_iomem) {
+		cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
+						cvma.vm_page_prot);
+	} else {
+		struct ttm_operation_ctx ctx = {
+			.interruptible = false,
+			.no_wait_gpu = false,
+			.flags = TTM_OPT_FLAG_FORCE_ALLOC
+
+		};
+
+		ttm = bo->ttm;
+		cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
+						cvma.vm_page_prot);
+
+		/* Allocate all page at once, most common usage */
+		if (ttm_tt_populate(ttm, &ctx)) {
+			ret = VM_FAULT_OOM;
+			goto out_io_unlock;
+		}
+	}
+
+	/*
+	 * Speculatively prefault a number of pages. Only error on
+	 * first page.
+	 */
+	for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) {
+		if (bo->mem.bus.is_iomem) {
+			/* Iomem should not be marked encrypted */
+			cvma.vm_page_prot = pgprot_decrypted(cvma.vm_page_prot);
+			pfn = ttm_bo_io_mem_pfn(bo, page_offset);
+		} else {
+			page = ttm->pages[page_offset];
+			if (unlikely(!page && i == 0)) {
+				ret = VM_FAULT_OOM;
+				goto out_io_unlock;
+			} else if (unlikely(!page)) {
+				break;
+			}
+			page->index = drm_vma_node_start(&bo->vma_node) +
+				page_offset;
+			pfn = page_to_pfn(page);
+		}
+
+		if (vma->vm_flags & VM_MIXEDMAP)
+			ret = vmf_insert_mixed(&cvma, address,
+					__pfn_to_pfn_t(pfn, PFN_DEV));
+		else
+			ret = vmf_insert_pfn(&cvma, address, pfn);
+
+		/* Never error on prefaulted PTEs */
+		if (unlikely((ret & VM_FAULT_ERROR))) {
+			if (i == 0)
+				goto out_io_unlock;
+			else
+				break;
+		}
+
+		address += PAGE_SIZE;
+		if (unlikely(++page_offset >= page_last))
+			break;
+	}
+	ret = VM_FAULT_NOPAGE;
+out_io_unlock:
+	ttm_mem_io_unlock(man);
+out_unlock:
+	ttm_bo_unreserve(bo);
+	return ret;
+}
+
+static void ttm_bo_vm_open(struct vm_area_struct *vma)
+{
+	struct ttm_buffer_object *bo =
+	    (struct ttm_buffer_object *)vma->vm_private_data;
+
+	WARN_ON(bo->bdev->dev_mapping != vma->vm_file->f_mapping);
+
+	ttm_bo_get(bo);
+}
+
+static void ttm_bo_vm_close(struct vm_area_struct *vma)
+{
+	struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data;
+
+	ttm_bo_put(bo);
+	vma->vm_private_data = NULL;
+}
+
+static int ttm_bo_vm_access_kmap(struct ttm_buffer_object *bo,
+				 unsigned long offset,
+				 uint8_t *buf, int len, int write)
+{
+	unsigned long page = offset >> PAGE_SHIFT;
+	unsigned long bytes_left = len;
+	int ret;
+
+	/* Copy a page at a time, that way no extra virtual address
+	 * mapping is needed
+	 */
+	offset -= page << PAGE_SHIFT;
+	do {
+		unsigned long bytes = min(bytes_left, PAGE_SIZE - offset);
+		struct ttm_bo_kmap_obj map;
+		void *ptr;
+		bool is_iomem;
+
+		ret = ttm_bo_kmap(bo, page, 1, &map);
+		if (ret)
+			return ret;
+
+		ptr = (uint8_t *)ttm_kmap_obj_virtual(&map, &is_iomem) + offset;
+		WARN_ON_ONCE(is_iomem);
+		if (write)
+			memcpy(ptr, buf, bytes);
+		else
+			memcpy(buf, ptr, bytes);
+		ttm_bo_kunmap(&map);
+
+		page++;
+		buf += bytes;
+		bytes_left -= bytes;
+		offset = 0;
+	} while (bytes_left);
+
+	return len;
+}
+
+static int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
+			    void *buf, int len, int write)
+{
+	unsigned long offset = (addr) - vma->vm_start;
+	struct ttm_buffer_object *bo = vma->vm_private_data;
+	int ret;
+
+	if (len < 1 || (offset + len) >> PAGE_SHIFT > bo->num_pages)
+		return -EIO;
+
+	ret = ttm_bo_reserve(bo, true, false, NULL);
+	if (ret)
+		return ret;
+
+	switch (bo->mem.mem_type) {
+	case TTM_PL_SYSTEM:
+		if (unlikely(bo->ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
+			ret = ttm_tt_swapin(bo->ttm);
+			if (unlikely(ret != 0))
+				return ret;
+		}
+		/* fall through */
+	case TTM_PL_TT:
+		ret = ttm_bo_vm_access_kmap(bo, offset, buf, len, write);
+		break;
+	default:
+		if (bo->bdev->driver->access_memory)
+			ret = bo->bdev->driver->access_memory(
+				bo, offset, buf, len, write);
+		else
+			ret = -EIO;
+	}
+
+	ttm_bo_unreserve(bo);
+
+	return ret;
+}
+
+static const struct vm_operations_struct ttm_bo_vm_ops = {
+	.fault = ttm_bo_vm_fault,
+	.open = ttm_bo_vm_open,
+	.close = ttm_bo_vm_close,
+	.access = ttm_bo_vm_access
+};
+
+static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev,
+						  unsigned long offset,
+						  unsigned long pages)
+{
+	struct drm_vma_offset_node *node;
+	struct ttm_buffer_object *bo = NULL;
+
+	drm_vma_offset_lock_lookup(&bdev->vma_manager);
+
+	node = drm_vma_offset_lookup_locked(&bdev->vma_manager, offset, pages);
+	if (likely(node)) {
+		bo = container_of(node, struct ttm_buffer_object, vma_node);
+		if (!kref_get_unless_zero(&bo->kref))
+			bo = NULL;
+	}
+
+	drm_vma_offset_unlock_lookup(&bdev->vma_manager);
+
+	if (!bo)
+		pr_err("Could not find buffer object to map\n");
+
+	return bo;
+}
+
+int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
+		struct ttm_bo_device *bdev)
+{
+	struct ttm_bo_driver *driver;
+	struct ttm_buffer_object *bo;
+	int ret;
+
+	bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma));
+	if (unlikely(!bo))
+		return -EINVAL;
+
+	driver = bo->bdev->driver;
+	if (unlikely(!driver->verify_access)) {
+		ret = -EPERM;
+		goto out_unref;
+	}
+	ret = driver->verify_access(bo, filp);
+	if (unlikely(ret != 0))
+		goto out_unref;
+
+	vma->vm_ops = &ttm_bo_vm_ops;
+
+	/*
+	 * Note: We're transferring the bo reference to
+	 * vma->vm_private_data here.
+	 */
+
+	vma->vm_private_data = bo;
+
+	/*
+	 * We'd like to use VM_PFNMAP on shared mappings, where
+	 * (vma->vm_flags & VM_SHARED) != 0, for performance reasons,
+	 * but for some reason VM_PFNMAP + x86 PAT + write-combine is very
+	 * bad for performance. Until that has been sorted out, use
+	 * VM_MIXEDMAP on all mappings. See freedesktop.org bug #75719
+	 */
+	vma->vm_flags |= VM_MIXEDMAP;
+	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
+	return 0;
+out_unref:
+	ttm_bo_put(bo);
+	return ret;
+}
+EXPORT_SYMBOL(ttm_bo_mmap);
+
+int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
+{
+	if (vma->vm_pgoff != 0)
+		return -EACCES;
+
+	ttm_bo_get(bo);
+
+	vma->vm_ops = &ttm_bo_vm_ops;
+	vma->vm_private_data = bo;
+	vma->vm_flags |= VM_MIXEDMAP;
+	vma->vm_flags |= VM_IO | VM_DONTEXPAND;
+	return 0;
+}
+EXPORT_SYMBOL(ttm_fbdev_mmap);