/* * 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
*/
/* * DMA * Starting with R600, the GPU has an asynchronous * DMA engine. The programming model is very similar * to the 3D engine (ring buffer, IBs, etc.), but the * DMA controller has it's own packet format that is * different form the PM4 format used by the 3D engine. * It supports copying data, writing embedded data, * solid fills, and a number of other things. It also * has support for tiling/detiling of buffers.
*/
/** * r600_dma_get_rptr - get the current read pointer * * @rdev: radeon_device pointer * @ring: radeon ring pointer * * Get the current rptr from the hardware (r6xx+).
*/
uint32_t r600_dma_get_rptr(struct radeon_device *rdev, struct radeon_ring *ring)
{
u32 rptr;
if (rdev->wb.enabled)
rptr = rdev->wb.wb[ring->rptr_offs/4]; else
rptr = RREG32(DMA_RB_RPTR);
return (rptr & 0x3fffc) >> 2;
}
/** * r600_dma_get_wptr - get the current write pointer * * @rdev: radeon_device pointer * @ring: radeon ring pointer * * Get the current wptr from the hardware (r6xx+).
*/
uint32_t r600_dma_get_wptr(struct radeon_device *rdev, struct radeon_ring *ring)
{ return (RREG32(DMA_RB_WPTR) & 0x3fffc) >> 2;
}
/** * r600_dma_set_wptr - commit the write pointer * * @rdev: radeon_device pointer * @ring: radeon ring pointer * * Write the wptr back to the hardware (r6xx+).
*/ void r600_dma_set_wptr(struct radeon_device *rdev, struct radeon_ring *ring)
{
WREG32(DMA_RB_WPTR, (ring->wptr << 2) & 0x3fffc);
}
/** * r600_dma_resume - setup and start the async dma engine * * @rdev: radeon_device pointer * * Set up the DMA ring buffer and enable it. (r6xx-evergreen). * Returns 0 for success, error for failure.
*/ int r600_dma_resume(struct radeon_device *rdev)
{ struct radeon_ring *ring = &rdev->ring[R600_RING_TYPE_DMA_INDEX];
u32 rb_cntl, dma_cntl, ib_cntl;
u32 rb_bufsz; int r;
r = radeon_ring_test(rdev, R600_RING_TYPE_DMA_INDEX, ring); if (r) {
ring->ready = false; return r;
}
if (rdev->asic->copy.copy_ring_index == R600_RING_TYPE_DMA_INDEX)
radeon_ttm_set_active_vram_size(rdev, rdev->mc.real_vram_size);
return 0;
}
/** * r600_dma_fini - tear down the async dma engine * * @rdev: radeon_device pointer * * Stop the async dma engine and free the ring (r6xx-evergreen).
*/ void r600_dma_fini(struct radeon_device *rdev)
{
r600_dma_stop(rdev);
radeon_ring_fini(rdev, &rdev->ring[R600_RING_TYPE_DMA_INDEX]);
}
/** * r600_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 r600_dma_is_lockup(struct radeon_device *rdev, struct radeon_ring *ring)
{
u32 reset_mask = r600_gpu_check_soft_reset(rdev);
/** * r600_dma_ring_test - simple async dma engine test * * @rdev: radeon_device pointer * @ring: radeon_ring structure holding ring information * * Test the DMA engine by writing using it to write an * value to memory. (r6xx-SI). * Returns 0 for success, error for failure.
*/ int r600_dma_ring_test(struct radeon_device *rdev, struct radeon_ring *ring)
{ unsigned i; int r; unsigned index;
u32 tmp;
u64 gpu_addr;
if (ring->idx == R600_RING_TYPE_DMA_INDEX)
index = R600_WB_DMA_RING_TEST_OFFSET; else
index = CAYMAN_WB_DMA1_RING_TEST_OFFSET;
r = radeon_ring_lock(rdev, ring, 4); if (r) {
DRM_ERROR("radeon: dma failed to lock ring %d (%d).\n", ring->idx, r); return r;
}
radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_WRITE, 0, 0, 1));
radeon_ring_write(ring, lower_32_bits(gpu_addr));
radeon_ring_write(ring, upper_32_bits(gpu_addr) & 0xff);
radeon_ring_write(ring, 0xDEADBEEF);
radeon_ring_unlock_commit(rdev, ring, false);
for (i = 0; i < rdev->usec_timeout; i++) {
tmp = le32_to_cpu(rdev->wb.wb[index/4]); if (tmp == 0xDEADBEEF) break;
udelay(1);
}
if (i < rdev->usec_timeout) {
DRM_INFO("ring test on %d succeeded in %d usecs\n", ring->idx, i);
} else {
DRM_ERROR("radeon: ring %d test failed (0x%08X)\n",
ring->idx, tmp);
r = -EINVAL;
} return r;
}
/** * r600_dma_fence_ring_emit - emit a fence on the DMA ring * * @rdev: radeon_device pointer * @fence: radeon fence object * * Add a DMA fence packet to the ring to write * the fence seq number and DMA trap packet to generate * an interrupt if needed (r6xx-r7xx).
*/ void r600_dma_fence_ring_emit(struct radeon_device *rdev, struct radeon_fence *fence)
{ struct radeon_ring *ring = &rdev->ring[fence->ring];
u64 addr = rdev->fence_drv[fence->ring].gpu_addr;
/** * r600_dma_semaphore_ring_emit - emit a semaphore on the dma ring * * @rdev: radeon_device pointer * @ring: radeon_ring structure holding ring information * @semaphore: radeon semaphore object * @emit_wait: wait or signal semaphore * * Add a DMA semaphore packet to the ring wait on or signal * other rings (r6xx-SI).
*/ bool r600_dma_semaphore_ring_emit(struct radeon_device *rdev, struct radeon_ring *ring, struct radeon_semaphore *semaphore, bool emit_wait)
{
u64 addr = semaphore->gpu_addr;
u32 s = emit_wait ? 0 : 1;
/** * r600_dma_ib_test - test an IB on the DMA engine * * @rdev: radeon_device pointer * @ring: radeon_ring structure holding ring information * * Test a simple IB in the DMA ring (r6xx-SI). * Returns 0 on success, error on failure.
*/ int r600_dma_ib_test(struct radeon_device *rdev, struct radeon_ring *ring)
{ struct radeon_ib ib; unsigned i; unsigned index; int r;
u32 tmp = 0;
u64 gpu_addr;
if (ring->idx == R600_RING_TYPE_DMA_INDEX)
index = R600_WB_DMA_RING_TEST_OFFSET; else
index = CAYMAN_WB_DMA1_RING_TEST_OFFSET;
gpu_addr = rdev->wb.gpu_addr + index;
r = radeon_ib_get(rdev, ring->idx, &ib, NULL, 256); if (r) {
DRM_ERROR("radeon: failed to get ib (%d).\n", r); return r;
}
/* The indirect buffer packet must end on an 8 DW boundary in the DMA ring. * Pad as necessary with NOPs.
*/ while ((ring->wptr & 7) != 5)
radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_NOP, 0, 0, 0));
radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_INDIRECT_BUFFER, 0, 0, 0));
radeon_ring_write(ring, (ib->gpu_addr & 0xFFFFFFE0));
radeon_ring_write(ring, (ib->length_dw << 16) | (upper_32_bits(ib->gpu_addr) & 0xFF));
}
/** * r600_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 (r6xx). * Used by the radeon ttm implementation to move pages if * registered as the asic copy callback.
*/ struct radeon_fence *r600_copy_dma(struct radeon_device *rdev,
uint64_t src_offset, uint64_t dst_offset, unsigned num_gpu_pages, struct dma_resv *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_dw, cur_size_in_dw; int i, num_loops; int r = 0;
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