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/*

 * Copyright 2013 Advanced Micro Devices, 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: Alex Deucher

 */

#include 

#include "radeon.h"

#include "radeon_asic.h"

#include "radeon_trace.h"

#include "sid.h"

u32 si_gpu_check_soft_reset(struct radeon_device *rdev);

/**

 * si_dma_is_lockup - Check if the DMA engine is locked up

 *

 * @rdev: radeon_device pointer

 * @ring: radeon_ring structure holding ring information

 *

 * Check if the async DMA engine is locked up.

 * Returns true if the engine appears to be locked up, false if not.

 */

bool si_dma_is_lockup(struct radeon_device *rdev, struct radeon_ring *ring)

{

	u32 reset_mask = si_gpu_check_soft_reset(rdev);

	u32 mask;

	if (ring->idx == R600_RING_TYPE_DMA_INDEX)

		mask = RADEON_RESET_DMA;

	else

		mask = RADEON_RESET_DMA1;

	if (!(reset_mask & mask)) {

		radeon_ring_lockup_update(rdev, ring);

		return false;

	}

	return radeon_ring_test_lockup(rdev, ring);

}

/**

 * si_dma_vm_copy_pages - update PTEs by copying them from the GART

 *

 * @rdev: radeon_device pointer

 * @ib: indirect buffer to fill with commands

 * @pe: addr of the page entry

 * @src: src addr where to copy from

 * @count: number of page entries to update

 *

 * Update PTEs by copying them from the GART using the DMA (SI).

 */

void si_dma_vm_copy_pages(struct radeon_device *rdev,

			  struct radeon_ib *ib,

			  uint64_t pe, uint64_t src,

			  unsigned count)

{

	while (count) {

		unsigned bytes = count * 8;

		if (bytes > 0xFFFF8)

			bytes = 0xFFFF8;

		ib->ptr[ib->length_dw++] = DMA_PACKET(DMA_PACKET_COPY,

						      1, 0, 0, bytes);

		ib->ptr[ib->length_dw++] = lower_32_bits(pe);

		ib->ptr[ib->length_dw++] = lower_32_bits(src);

		ib->ptr[ib->length_dw++] = upper_32_bits(pe) & 0xff;

		ib->ptr[ib->length_dw++] = upper_32_bits(src) & 0xff;

		pe += bytes;

		src += bytes;

		count -= bytes / 8;

	}

}

/**

 * si_dma_vm_write_pages - update PTEs by writing them manually

 *

 * @rdev: radeon_device pointer

 * @ib: indirect buffer to fill with commands

 * @pe: addr of the page entry

 * @addr: dst addr to write into pe

 * @count: number of page entries to update

 * @incr: increase next addr by incr bytes

 * @flags: access flags

 *

 * Update PTEs by writing them manually using the DMA (SI).

 */

void si_dma_vm_write_pages(struct radeon_device *rdev,

			   struct radeon_ib *ib,

			   uint64_t pe,

			   uint64_t addr, unsigned count,

			   uint32_t incr, uint32_t flags)

{

	uint64_t value;

	unsigned ndw;

	while (count) {

		ndw = count * 2;

		if (ndw > 0xFFFFE)

			ndw = 0xFFFFE;

		/* for non-physically contiguous pages (system) */

		ib->ptr[ib->length_dw++] = DMA_PACKET(DMA_PACKET_WRITE, 0, 0, 0, ndw);

		ib->ptr[ib->length_dw++] = pe;

		ib->ptr[ib->length_dw++] = upper_32_bits(pe) & 0xff;

		for (; ndw > 0; ndw -= 2, --count, pe += 8) {

			if (flags & R600_PTE_SYSTEM) {

				value = radeon_vm_map_gart(rdev, addr);

			} else if (flags & R600_PTE_VALID) {

				value = addr;

			} else {

				value = 0;

			}

			addr += incr;

			value |= flags;

			ib->ptr[ib->length_dw++] = value;

			ib->ptr[ib->length_dw++] = upper_32_bits(value);

		}

	}

}

/**

 * si_dma_vm_set_pages - update the page tables using the DMA

 *

 * @rdev: radeon_device pointer

 * @ib: indirect buffer to fill with commands

 * @pe: addr of the page entry

 * @addr: dst addr to write into pe

 * @count: number of page entries to update

 * @incr: increase next addr by incr bytes

 * @flags: access flags

 *

 * Update the page tables using the DMA (SI).

 */

void si_dma_vm_set_pages(struct radeon_device *rdev,

			 struct radeon_ib *ib,

			 uint64_t pe,

			 uint64_t addr, unsigned count,

			 uint32_t incr, uint32_t flags)

{

	uint64_t value;

	unsigned ndw;

	while (count) {

		ndw = count * 2;

		if (ndw > 0xFFFFE)

			ndw = 0xFFFFE;

		if (flags & R600_PTE_VALID)

			value = addr;

		else

			value = 0;

		/* for physically contiguous pages (vram) */

		ib->ptr[ib->length_dw++] = DMA_PTE_PDE_PACKET(ndw);

		ib->ptr[ib->length_dw++] = pe; /* dst addr */

		ib->ptr[ib->length_dw++] = upper_32_bits(pe) & 0xff;

		ib->ptr[ib->length_dw++] = flags; /* mask */

		ib->ptr[ib->length_dw++] = 0;

		ib->ptr[ib->length_dw++] = value; /* value */

		ib->ptr[ib->length_dw++] = upper_32_bits(value);

		ib->ptr[ib->length_dw++] = incr; /* increment size */

		ib->ptr[ib->length_dw++] = 0;

		pe += ndw * 4;

		addr += (ndw / 2) * incr;

		count -= ndw / 2;

	}

}

void si_dma_vm_flush(struct radeon_device *rdev, struct radeon_ring *ring,

		     unsigned vm_id, uint64_t pd_addr)

{

	radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_SRBM_WRITE, 0, 0, 0, 0));

	if (vm_id < 8) {

		radeon_ring_write(ring, (0xf << 16) | ((VM_CONTEXT0_PAGE_TABLE_BASE_ADDR + (vm_id << 2)) >> 2));

	} else {

		radeon_ring_write(ring, (0xf << 16) | ((VM_CONTEXT8_PAGE_TABLE_BASE_ADDR + ((vm_id - 8) << 2)) >> 2));

	}

	radeon_ring_write(ring, pd_addr >> 12);

	/* flush hdp cache */

	radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_SRBM_WRITE, 0, 0, 0, 0));

	radeon_ring_write(ring, (0xf << 16) | (HDP_MEM_COHERENCY_FLUSH_CNTL >> 2));

	radeon_ring_write(ring, 1);

	/* bits 0-7 are the VM contexts0-7 */

	radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_SRBM_WRITE, 0, 0, 0, 0));

	radeon_ring_write(ring, (0xf << 16) | (VM_INVALIDATE_REQUEST >> 2));

	radeon_ring_write(ring, 1 << vm_id);

	/* wait for invalidate to complete */

	radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_POLL_REG_MEM, 0, 0, 0, 0));

	radeon_ring_write(ring, VM_INVALIDATE_REQUEST);

	radeon_ring_write(ring, 0xff << 16); /* retry */

	radeon_ring_write(ring, 1 << vm_id); /* mask */

	radeon_ring_write(ring, 0); /* value */

	radeon_ring_write(ring, (0 << 28) | 0x20); /* func(always) | poll interval */

}

/**

 * si_copy_dma - copy pages using the DMA engine

 *

 * @rdev: radeon_device pointer

 * @src_offset: src GPU address

 * @dst_offset: dst GPU address

 * @num_gpu_pages: number of GPU pages to xfer

 * @resv: reservation object to sync to

 *

 * Copy GPU paging using the DMA engine (SI).

 * Used by the radeon ttm implementation to move pages if

 * registered as the asic copy callback.

 */

struct radeon_fence *si_copy_dma(struct radeon_device *rdev,

				 uint64_t src_offset, uint64_t dst_offset,

				 unsigned num_gpu_pages,

				 struct reservation_object *resv)

{

	struct radeon_fence *fence;

	struct radeon_sync sync;

	int ring_index = rdev->asic->copy.dma_ring_index;

	struct radeon_ring *ring = &rdev->ring[ring_index];

	u32 size_in_bytes, cur_size_in_bytes;

	int i, num_loops;

	int r = 0;

	radeon_sync_create(&sync);

	size_in_bytes = (num_gpu_pages << RADEON_GPU_PAGE_SHIFT);

	num_loops = DIV_ROUND_UP(size_in_bytes, 0xfffff);

	r = radeon_ring_lock(rdev, ring, num_loops * 5 + 11);

	if (r) {

		DRM_ERROR("radeon: moving bo (%d).\n", r);

		radeon_sync_free(rdev, &sync, NULL);

		return ERR_PTR(r);

	}

	radeon_sync_resv(rdev, &sync, resv, false);

	radeon_sync_rings(rdev, &sync, ring->idx);

	for (i = 0; i < num_loops; i++) {

		cur_size_in_bytes = size_in_bytes;

		if (cur_size_in_bytes > 0xFFFFF)

			cur_size_in_bytes = 0xFFFFF;

		size_in_bytes -= cur_size_in_bytes;

		radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_COPY, 1, 0, 0, cur_size_in_bytes));

		radeon_ring_write(ring, lower_32_bits(dst_offset));

		radeon_ring_write(ring, lower_32_bits(src_offset));

		radeon_ring_write(ring, upper_32_bits(dst_offset) & 0xff);

		radeon_ring_write(ring, upper_32_bits(src_offset) & 0xff);

		src_offset += cur_size_in_bytes;

		dst_offset += cur_size_in_bytes;

	}

	r = radeon_fence_emit(rdev, &fence, ring->idx);

	if (r) {

		radeon_ring_unlock_undo(rdev, ring);

		radeon_sync_free(rdev, &sync, NULL);

		return ERR_PTR(r);

	}

	radeon_ring_unlock_commit(rdev, ring, false);

	radeon_sync_free(rdev, &sync, fence);

	return fence;

}