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/*
* Copyright 2014 Advanced Micro Devices, Inc.
* 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 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.
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
*/
/*
* Authors:
* Christian König <christian.koenig@amd.com>
*/
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/mmu_notifier.h>
#include <drm/drm.h>
#include "radeon.h"
/**
* radeon_mn_invalidate - callback to notify about mm change
*
* @mn: our notifier
* @range: the VMA under invalidation
*
* We block for all BOs between start and end to be idle and
* unmap them by move them into system domain again.
*/
static bool radeon_mn_invalidate(struct mmu_interval_notifier *mn,
const struct mmu_notifier_range *range,
unsigned long cur_seq)
{
struct radeon_bo *bo = container_of(mn, struct radeon_bo, notifier);
struct ttm_operation_ctx ctx = { false, false };
long r;
if (!bo->tbo.ttm || !radeon_ttm_tt_is_bound(bo->tbo.bdev, bo->tbo.ttm))
return true;
if (!mmu_notifier_range_blockable(range))
return false;
r = radeon_bo_reserve(bo, true);
if (r) {
DRM_ERROR("(%ld) failed to reserve user bo\n", r);
return true;
}
r = dma_resv_wait_timeout_rcu(bo->tbo.base.resv, true, false,
MAX_SCHEDULE_TIMEOUT);
if (r <= 0)
DRM_ERROR("(%ld) failed to wait for user bo\n", r);
radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_CPU);
r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
if (r)
DRM_ERROR("(%ld) failed to validate user bo\n", r);
radeon_bo_unreserve(bo);
return true;
}
static const struct mmu_interval_notifier_ops radeon_mn_ops = {
.invalidate = radeon_mn_invalidate,
};
/**
* radeon_mn_register - register a BO for notifier updates
*
* @bo: radeon buffer object
* @addr: userptr addr we should monitor
*
* Registers an MMU notifier for the given BO at the specified address.
* Returns 0 on success, -ERRNO if anything goes wrong.
*/
int radeon_mn_register(struct radeon_bo *bo, unsigned long addr)
{
int ret;
ret = mmu_interval_notifier_insert(&bo->notifier, current->mm, addr,
radeon_bo_size(bo), &radeon_mn_ops);
if (ret)
return ret;
/*
* FIXME: radeon appears to allow get_user_pages to run during
* invalidate_range_start/end, which is not a safe way to read the
* PTEs. It should use the mmu_interval_read_begin() scheme around the
* get_user_pages to ensure that the PTEs are read properly
*/
mmu_interval_read_begin(&bo->notifier);
return 0;
}
/**
* radeon_mn_unregister - unregister a BO for notifier updates
*
* @bo: radeon buffer object
*
* Remove any registration of MMU notifier updates from the buffer object.
*/
void radeon_mn_unregister(struct radeon_bo *bo)
{
if (!bo->notifier.mm)
return;
mmu_interval_notifier_remove(&bo->notifier);
bo->notifier.mm = NULL;
}
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