[people/arne_f/kernel.git] / drivers / gpu / drm / ttm / ttm_bo_vm.c

/* 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);
		reservation_object_unlock(bo->resv);
		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.
	 */
	if (unlikely(!reservation_object_trylock(bo->resv))) {
		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) {
		struct dma_fence *moving = dma_fence_get(bo->moving);

		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;
		}

		if (bo->moving != moving) {
			spin_lock(&bdev->glob->lru_lock);
			ttm_bo_move_to_lru_tail(bo, NULL);
			spin_unlock(&bdev->glob->lru_lock);
		}
		dma_fence_put(moving);
	}

	/*
	 * 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);

		/*
		 * Somebody beat us to this PTE or prefaulting to
		 * an already populated PTE, or prefaulting error.
		 */

		if (unlikely((ret == VM_FAULT_NOPAGE && i > 0)))
			break;
		else if (unlikely(ret & VM_FAULT_ERROR))
			goto out_io_unlock;

		address += PAGE_SIZE;
		if (unlikely(++page_offset >= page_last))
			break;
	}
	ret = VM_FAULT_NOPAGE;
out_io_unlock:
	ttm_mem_io_unlock(man);
out_unlock:
	reservation_object_unlock(bo->resv);
	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);
		bo = ttm_bo_get_unless_zero(bo);
	}

	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;

	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
		return -EINVAL;

	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);
Commit	Line	Data
1297bf2e	1	/* SPDX-License-Identifier: GPL-2.0 OR MIT */
ba4e7d97 TH	2	/**************************************************************************
	3	*
	4	* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
	5	* All Rights Reserved.
	6	*
	7	* Permission is hereby granted, free of charge, to any person obtaining a
	8	* copy of this software and associated documentation files (the
	9	* "Software"), to deal in the Software without restriction, including
	10	* without limitation the rights to use, copy, modify, merge, publish,
	11	* distribute, sub license, and/or sell copies of the Software, and to
	12	* permit persons to whom the Software is furnished to do so, subject to
	13	* the following conditions:
	14	*
	15	* The above copyright notice and this permission notice (including the
	16	* next paragraph) shall be included in all copies or substantial portions
	17	* of the Software.
	18	*
	19	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	20	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	21	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
	22	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
	23	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
	24	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
	25	* USE OR OTHER DEALINGS IN THE SOFTWARE.
	26	*
	27	**************************************************************************/
	28	/*
	29	* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
	30	*/
	31
25d0479a JP	32	#define pr_fmt(fmt) "[TTM] " fmt
25d0479a JP	33
2da83319 MY	34	#include <drm/ttm/ttm_module.h>
	35	#include <drm/ttm/ttm_bo_driver.h>
	36	#include <drm/ttm/ttm_placement.h>
72525b3f	37	#include <drm/drm_vma_manager.h>
ba4e7d97	38	#include <linux/mm.h>
01c8f1c4	39	#include <linux/pfn_t.h>
ba4e7d97 TH	40	#include <linux/rbtree.h>
	41	#include <linux/module.h>
	42	#include <linux/uaccess.h>
95cf9264	43	#include <linux/mem_encrypt.h>
ba4e7d97 TH	44
	45	#define TTM_BO_VM_NUM_PREFAULT 16
	46
4daa4fba	47	static vm_fault_t ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo,
cbe12e74 TH	48	struct vm_fault *vmf)
cbe12e74 TH	49	{
4daa4fba SJ	50	vm_fault_t ret = 0;
4daa4fba SJ	51	int err = 0;
cbe12e74	52
5bc73067	53	if (likely(!bo->moving))
cbe12e74 TH	54	goto out_unlock;
	55
	56	/*
	57	* Quick non-stalling check for idle.
	58	*/
f54d1867	59	if (dma_fence_is_signaled(bo->moving))
5bc73067	60	goto out_clear;
cbe12e74 TH	61
	62	/*
	63	* If possible, avoid waiting for GPU with mmap_sem
	64	* held.
	65	*/
	66	if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) {
	67	ret = VM_FAULT_RETRY;
	68	if (vmf->flags & FAULT_FLAG_RETRY_NOWAIT)
	69	goto out_unlock;
	70
8129fdad	71	ttm_bo_get(bo);
11bac800	72	up_read(&vmf->vma->vm_mm->mmap_sem);
f54d1867	73	(void) dma_fence_wait(bo->moving, true);
5d50fcbd	74	reservation_object_unlock(bo->resv);
f4490759	75	ttm_bo_put(bo);
cbe12e74 TH	76	goto out_unlock;
	77	}
	78
	79	/*
	80	* Ordinary wait.
	81	*/
4daa4fba SJ	82	err = dma_fence_wait(bo->moving, true);
	83	if (unlikely(err != 0)) {
	84	ret = (err != -ERESTARTSYS) ? VM_FAULT_SIGBUS :
cbe12e74	85	VM_FAULT_NOPAGE;
5bc73067 CK	86	goto out_unlock;
	87	}
	88
	89	out_clear:
f54d1867	90	dma_fence_put(bo->moving);
5bc73067	91	bo->moving = NULL;
cbe12e74 TH	92
cbe12e74 TH	93	out_unlock:
cbe12e74 TH	94	return ret;
	95	}
	96
c67fa6ed TX	97	static unsigned long ttm_bo_io_mem_pfn(struct ttm_buffer_object *bo,
	98	unsigned long page_offset)
	99	{
	100	struct ttm_bo_device *bdev = bo->bdev;
	101
	102	if (bdev->driver->io_mem_pfn)
	103	return bdev->driver->io_mem_pfn(bo, page_offset);
	104
e83bf4ad TX	105	return ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT)
e83bf4ad TX	106	+ page_offset;
c67fa6ed TX	107	}
c67fa6ed TX	108
4daa4fba	109	static vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
ba4e7d97	110	{
11bac800	111	struct vm_area_struct *vma = vmf->vma;
ba4e7d97 TH	112	struct ttm_buffer_object bo = (struct ttm_buffer_object )
	113	vma->vm_private_data;
	114	struct ttm_bo_device *bdev = bo->bdev;
ba4e7d97 TH	115	unsigned long page_offset;
	116	unsigned long page_last;
	117	unsigned long pfn;
	118	struct ttm_tt *ttm = NULL;
	119	struct page *page;
4daa4fba	120	int err;
ba4e7d97	121	int i;
4daa4fba	122	vm_fault_t ret = VM_FAULT_NOPAGE;
1a29d85e	123	unsigned long address = vmf->address;
eba67093 TH	124	struct ttm_mem_type_manager *man =
eba67093 TH	125	&bdev->man[bo->mem.mem_type];
3943875e	126	struct vm_area_struct cvma;
ba4e7d97 TH	127
	128	/*
	129	* Work around locking order reversal in fault / nopfn
	130	* between mmap_sem and bo_reserve: Perform a trylock operation
c58f009e TH	131	* for reserve, and if it fails, retry the fault after waiting
c58f009e TH	132	* for the buffer to become unreserved.
ba4e7d97	133	*/
5d50fcbd	134	if (unlikely(!reservation_object_trylock(bo->resv))) {
c58f009e TH	135	if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) {
c58f009e TH	136	if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
8129fdad	137	ttm_bo_get(bo);
11bac800	138	up_read(&vmf->vma->vm_mm->mmap_sem);
c58f009e	139	(void) ttm_bo_wait_unreserved(bo);
f4490759	140	ttm_bo_put(bo);
c58f009e TH	141	}
	142
	143	return VM_FAULT_RETRY;
	144	}
	145
	146	/*
	147	* If we'd want to change locking order to
	148	* mmap_sem -> bo::reserve, we'd use a blocking reserve here
	149	* instead of retrying the fault...
	150	*/
ba4e7d97 TH	151	return VM_FAULT_NOPAGE;
	152	}
	153
667a50db TH	154	/*
	155	* Refuse to fault imported pages. This should be handled
	156	* (if at all) by redirecting mmap to the exporter.
	157	*/
	158	if (bo->ttm && (bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
de8dfb8e	159	ret = VM_FAULT_SIGBUS;
667a50db TH	160	goto out_unlock;
	161	}
	162
82c5da6b	163	if (bdev->driver->fault_reserve_notify) {
5d50fcbd CK	164	struct dma_fence *moving = dma_fence_get(bo->moving);
5d50fcbd CK	165
4daa4fba SJ	166	err = bdev->driver->fault_reserve_notify(bo);
4daa4fba SJ	167	switch (err) {
82c5da6b JG	168	case 0:
	169	break;
	170	case -EBUSY:
82c5da6b	171	case -ERESTARTSYS:
de8dfb8e	172	ret = VM_FAULT_NOPAGE;
82c5da6b JG	173	goto out_unlock;
82c5da6b JG	174	default:
de8dfb8e	175	ret = VM_FAULT_SIGBUS;
82c5da6b JG	176	goto out_unlock;
82c5da6b JG	177	}
5d50fcbd CK	178
	179	if (bo->moving != moving) {
	180	spin_lock(&bdev->glob->lru_lock);
	181	ttm_bo_move_to_lru_tail(bo, NULL);
	182	spin_unlock(&bdev->glob->lru_lock);
	183	}
	184	dma_fence_put(moving);
82c5da6b	185	}
e024e110	186
ba4e7d97 TH	187	/*
	188	* Wait for buffer data in transit, due to a pipelined
	189	* move.
	190	*/
11bac800	191	ret = ttm_bo_vm_fault_idle(bo, vmf);
cbe12e74	192	if (unlikely(ret != 0)) {
de8dfb8e	193	if (ret == VM_FAULT_RETRY &&
3089c1df NH	194	!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
3089c1df NH	195	/* The BO has already been unreserved. */
de8dfb8e	196	return ret;
3089c1df NH	197	}
3089c1df NH	198
cbe12e74 TH	199	goto out_unlock;
cbe12e74 TH	200	}
ba4e7d97	201
4daa4fba SJ	202	err = ttm_mem_io_lock(man, true);
4daa4fba SJ	203	if (unlikely(err != 0)) {
de8dfb8e	204	ret = VM_FAULT_NOPAGE;
ba4e7d97 TH	205	goto out_unlock;
ba4e7d97 TH	206	}
4daa4fba SJ	207	err = ttm_mem_io_reserve_vm(bo);
4daa4fba SJ	208	if (unlikely(err != 0)) {
de8dfb8e	209	ret = VM_FAULT_SIGBUS;
eba67093 TH	210	goto out_io_unlock;
eba67093 TH	211	}
ba4e7d97	212
ba4e7d97	213	page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
d3867355 TH	214	vma->vm_pgoff - drm_vma_node_start(&bo->vma_node);
	215	page_last = vma_pages(vma) + vma->vm_pgoff -
	216	drm_vma_node_start(&bo->vma_node);
ba4e7d97 TH	217
ba4e7d97 TH	218	if (unlikely(page_offset >= bo->num_pages)) {
de8dfb8e	219	ret = VM_FAULT_SIGBUS;
eba67093	220	goto out_io_unlock;
ba4e7d97 TH	221	}
	222
	223	/*
3943875e TH	224	* Make a local vma copy to modify the page_prot member
	225	* and vm_flags if necessary. The vma parameter is protected
	226	* by mmap_sem in write mode.
ba4e7d97	227	*/
3943875e TH	228	cvma = *vma;
	229	cvma.vm_page_prot = vm_get_page_prot(cvma.vm_flags);
	230
82c5da6b	231	if (bo->mem.bus.is_iomem) {
3943875e TH	232	cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
3943875e TH	233	cvma.vm_page_prot);
ba4e7d97	234	} else {
d0cef9fa RH	235	struct ttm_operation_ctx ctx = {
d0cef9fa RH	236	.interruptible = false,
aa7662b6 RH	237	.no_wait_gpu = false,
	238	.flags = TTM_OPT_FLAG_FORCE_ALLOC
	239
d0cef9fa RH	240	};
d0cef9fa RH	241
ba4e7d97	242	ttm = bo->ttm;
94318d50 BH	243	cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
94318d50 BH	244	cvma.vm_page_prot);
b1e5f172 JG	245
b1e5f172 JG	246	/* Allocate all page at once, most common usage */
25893a14	247	if (ttm_tt_populate(ttm, &ctx)) {
de8dfb8e	248	ret = VM_FAULT_OOM;
b1e5f172 JG	249	goto out_io_unlock;
b1e5f172 JG	250	}
ba4e7d97 TH	251	}
	252
	253	/*
	254	* Speculatively prefault a number of pages. Only error on
	255	* first page.
	256	*/
ba4e7d97	257	for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) {
95cf9264 TL	258	if (bo->mem.bus.is_iomem) {
	259	/* Iomem should not be marked encrypted */
	260	cvma.vm_page_prot = pgprot_decrypted(cvma.vm_page_prot);
c67fa6ed	261	pfn = ttm_bo_io_mem_pfn(bo, page_offset);
95cf9264	262	} else {
b1e5f172	263	page = ttm->pages[page_offset];
ba4e7d97	264	if (unlikely(!page && i == 0)) {
de8dfb8e	265	ret = VM_FAULT_OOM;
eba67093	266	goto out_io_unlock;
ba4e7d97 TH	267	} else if (unlikely(!page)) {
	268	break;
	269	}
58aa6622 TH	270	page->index = drm_vma_node_start(&bo->vma_node) +
58aa6622 TH	271	page_offset;
ba4e7d97 TH	272	pfn = page_to_pfn(page);
	273	}
	274
7dfe8b61	275	if (vma->vm_flags & VM_MIXEDMAP)
4daa4fba	276	ret = vmf_insert_mixed(&cvma, address,
01c8f1c4	277	__pfn_to_pfn_t(pfn, PFN_DEV));
7dfe8b61	278	else
4daa4fba	279	ret = vmf_insert_pfn(&cvma, address, pfn);
7dfe8b61	280
ba4e7d97 TH	281	/*
	282	* Somebody beat us to this PTE or prefaulting to
	283	* an already populated PTE, or prefaulting error.
	284	*/
	285
4daa4fba	286	if (unlikely((ret == VM_FAULT_NOPAGE && i > 0)))
ba4e7d97	287	break;
4daa4fba	288	else if (unlikely(ret & VM_FAULT_ERROR))
eba67093	289	goto out_io_unlock;
ba4e7d97 TH	290
	291	address += PAGE_SIZE;
	292	if (unlikely(++page_offset >= page_last))
	293	break;
	294	}
de8dfb8e	295	ret = VM_FAULT_NOPAGE;
eba67093 TH	296	out_io_unlock:
eba67093 TH	297	ttm_mem_io_unlock(man);
ba4e7d97	298	out_unlock:
5d50fcbd	299	reservation_object_unlock(bo->resv);
de8dfb8e	300	return ret;
ba4e7d97 TH	301	}
	302
	303	static void ttm_bo_vm_open(struct vm_area_struct *vma)
	304	{
	305	struct ttm_buffer_object *bo =
	306	(struct ttm_buffer_object *)vma->vm_private_data;
	307
58aa6622 TH	308	WARN_ON(bo->bdev->dev_mapping != vma->vm_file->f_mapping);
58aa6622 TH	309
8129fdad	310	ttm_bo_get(bo);
ba4e7d97 TH	311	}
	312
	313	static void ttm_bo_vm_close(struct vm_area_struct *vma)
	314	{
82c5da6b	315	struct ttm_buffer_object bo = (struct ttm_buffer_object )vma->vm_private_data;
ba4e7d97	316
f4490759	317	ttm_bo_put(bo);
ba4e7d97 TH	318	vma->vm_private_data = NULL;
	319	}
	320
09ac4fcb FK	321	static int ttm_bo_vm_access_kmap(struct ttm_buffer_object *bo,
09ac4fcb FK	322	unsigned long offset,
95244db2	323	uint8_t *buf, int len, int write)
09ac4fcb FK	324	{
	325	unsigned long page = offset >> PAGE_SHIFT;
	326	unsigned long bytes_left = len;
	327	int ret;
	328
	329	/* Copy a page at a time, that way no extra virtual address
	330	* mapping is needed
	331	*/
	332	offset -= page << PAGE_SHIFT;
	333	do {
	334	unsigned long bytes = min(bytes_left, PAGE_SIZE - offset);
	335	struct ttm_bo_kmap_obj map;
	336	void *ptr;
	337	bool is_iomem;
	338
	339	ret = ttm_bo_kmap(bo, page, 1, &map);
	340	if (ret)
	341	return ret;
	342
	343	ptr = (uint8_t *)ttm_kmap_obj_virtual(&map, &is_iomem) + offset;
	344	WARN_ON_ONCE(is_iomem);
	345	if (write)
	346	memcpy(ptr, buf, bytes);
	347	else
	348	memcpy(buf, ptr, bytes);
	349	ttm_bo_kunmap(&map);
	350
	351	page++;
95244db2	352	buf += bytes;
09ac4fcb FK	353	bytes_left -= bytes;
	354	offset = 0;
	355	} while (bytes_left);
	356
	357	return len;
	358	}
	359
	360	static int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
	361	void *buf, int len, int write)
	362	{
	363	unsigned long offset = (addr) - vma->vm_start;
	364	struct ttm_buffer_object *bo = vma->vm_private_data;
	365	int ret;
	366
	367	if (len < 1 \|\| (offset + len) >> PAGE_SHIFT > bo->num_pages)
	368	return -EIO;
	369
	370	ret = ttm_bo_reserve(bo, true, false, NULL);
	371	if (ret)
	372	return ret;
	373
	374	switch (bo->mem.mem_type) {
	375	case TTM_PL_SYSTEM:
	376	if (unlikely(bo->ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
	377	ret = ttm_tt_swapin(bo->ttm);
	378	if (unlikely(ret != 0))
	379	return ret;
	380	}
	381	/* fall through */
	382	case TTM_PL_TT:
	383	ret = ttm_bo_vm_access_kmap(bo, offset, buf, len, write);
	384	break;
	385	default:
	386	if (bo->bdev->driver->access_memory)
	387	ret = bo->bdev->driver->access_memory(
	388	bo, offset, buf, len, write);
	389	else
	390	ret = -EIO;
	391	}
	392
	393	ttm_bo_unreserve(bo);
	394
	395	return ret;
	396	}
	397
f0f37e2f	398	static const struct vm_operations_struct ttm_bo_vm_ops = {
ba4e7d97 TH	399	.fault = ttm_bo_vm_fault,
ba4e7d97 TH	400	.open = ttm_bo_vm_open,
09ac4fcb FK	401	.close = ttm_bo_vm_close,
09ac4fcb FK	402	.access = ttm_bo_vm_access
ba4e7d97 TH	403	};
ba4e7d97 TH	404
72525b3f DH	405	static struct ttm_buffer_object ttm_bo_vm_lookup(struct ttm_bo_device bdev,
	406	unsigned long offset,
	407	unsigned long pages)
	408	{
	409	struct drm_vma_offset_node *node;
	410	struct ttm_buffer_object *bo = NULL;
	411
	412	drm_vma_offset_lock_lookup(&bdev->vma_manager);
	413
	414	node = drm_vma_offset_lookup_locked(&bdev->vma_manager, offset, pages);
	415	if (likely(node)) {
	416	bo = container_of(node, struct ttm_buffer_object, vma_node);
24dc64c1	417	bo = ttm_bo_get_unless_zero(bo);
72525b3f DH	418	}
	419
	420	drm_vma_offset_unlock_lookup(&bdev->vma_manager);
	421
	422	if (!bo)
	423	pr_err("Could not find buffer object to map\n");
	424
	425	return bo;
	426	}
	427
ba4e7d97 TH	428	int ttm_bo_mmap(struct file filp, struct vm_area_struct vma,
	429	struct ttm_bo_device *bdev)
	430	{
	431	struct ttm_bo_driver *driver;
	432	struct ttm_buffer_object *bo;
	433	int ret;
	434
bed2dd84 TZ	435	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
	436	return -EINVAL;
	437
72525b3f DH	438	bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma));
72525b3f DH	439	if (unlikely(!bo))
ba4e7d97	440	return -EINVAL;
ba4e7d97 TH	441
	442	driver = bo->bdev->driver;
	443	if (unlikely(!driver->verify_access)) {
	444	ret = -EPERM;
	445	goto out_unref;
	446	}
	447	ret = driver->verify_access(bo, filp);
	448	if (unlikely(ret != 0))
	449	goto out_unref;
	450
	451	vma->vm_ops = &ttm_bo_vm_ops;
	452
	453	/*
	454	* Note: We're transferring the bo reference to
	455	* vma->vm_private_data here.
	456	*/
	457
	458	vma->vm_private_data = bo;
7dfe8b61 TH	459
7dfe8b61 TH	460	/*
0e6d6ec0 TH	461	* We'd like to use VM_PFNMAP on shared mappings, where
	462	* (vma->vm_flags & VM_SHARED) != 0, for performance reasons,
	463	* but for some reason VM_PFNMAP + x86 PAT + write-combine is very
	464	* bad for performance. Until that has been sorted out, use
	465	* VM_MIXEDMAP on all mappings. See freedesktop.org bug #75719
7dfe8b61	466	*/
0e6d6ec0	467	vma->vm_flags \|= VM_MIXEDMAP;
7dfe8b61	468	vma->vm_flags \|= VM_IO \| VM_DONTEXPAND \| VM_DONTDUMP;
ba4e7d97 TH	469	return 0;
ba4e7d97 TH	470	out_unref:
f4490759	471	ttm_bo_put(bo);
ba4e7d97 TH	472	return ret;
	473	}
	474	EXPORT_SYMBOL(ttm_bo_mmap);
	475
	476	int ttm_fbdev_mmap(struct vm_area_struct vma, struct ttm_buffer_object bo)
	477	{
	478	if (vma->vm_pgoff != 0)
	479	return -EACCES;
	480
8129fdad TZ	481	ttm_bo_get(bo);
8129fdad TZ	482
ba4e7d97	483	vma->vm_ops = &ttm_bo_vm_ops;
8129fdad	484	vma->vm_private_data = bo;
0e6d6ec0	485	vma->vm_flags \|= VM_MIXEDMAP;
7dfe8b61	486	vma->vm_flags \|= VM_IO \| VM_DONTEXPAND;
ba4e7d97 TH	487	return 0;
	488	}
	489	EXPORT_SYMBOL(ttm_fbdev_mmap);