diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c | 300 |
1 files changed, 300 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c new file mode 100644 index 000000000..f3b0aaf3e --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c @@ -0,0 +1,300 @@ +/* + * Copyright 2014 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. + * + */ + +#include <linux/dma-mapping.h> + +#include "amdgpu.h" +#include "amdgpu_ih.h" + +/** + * amdgpu_ih_ring_init - initialize the IH state + * + * @adev: amdgpu_device pointer + * @ih: ih ring to initialize + * @ring_size: ring size to allocate + * @use_bus_addr: true when we can use dma_alloc_coherent + * + * Initializes the IH state and allocates a buffer + * for the IH ring buffer. + * Returns 0 for success, errors for failure. + */ +int amdgpu_ih_ring_init(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih, + unsigned ring_size, bool use_bus_addr) +{ + u32 rb_bufsz; + int r; + + /* Align ring size */ + rb_bufsz = order_base_2(ring_size / 4); + ring_size = (1 << rb_bufsz) * 4; + ih->ring_size = ring_size; + ih->ptr_mask = ih->ring_size - 1; + ih->rptr = 0; + ih->use_bus_addr = use_bus_addr; + + if (use_bus_addr) { + dma_addr_t dma_addr; + + if (ih->ring) + return 0; + + /* add 8 bytes for the rptr/wptr shadows and + * add them to the end of the ring allocation. + */ + ih->ring = dma_alloc_coherent(adev->dev, ih->ring_size + 8, + &dma_addr, GFP_KERNEL); + if (ih->ring == NULL) + return -ENOMEM; + + ih->gpu_addr = dma_addr; + ih->wptr_addr = dma_addr + ih->ring_size; + ih->wptr_cpu = &ih->ring[ih->ring_size / 4]; + ih->rptr_addr = dma_addr + ih->ring_size + 4; + ih->rptr_cpu = &ih->ring[(ih->ring_size / 4) + 1]; + } else { + unsigned wptr_offs, rptr_offs; + + r = amdgpu_device_wb_get(adev, &wptr_offs); + if (r) + return r; + + r = amdgpu_device_wb_get(adev, &rptr_offs); + if (r) { + amdgpu_device_wb_free(adev, wptr_offs); + return r; + } + + r = amdgpu_bo_create_kernel(adev, ih->ring_size, PAGE_SIZE, + AMDGPU_GEM_DOMAIN_GTT, + &ih->ring_obj, &ih->gpu_addr, + (void **)&ih->ring); + if (r) { + amdgpu_device_wb_free(adev, rptr_offs); + amdgpu_device_wb_free(adev, wptr_offs); + return r; + } + + ih->wptr_addr = adev->wb.gpu_addr + wptr_offs * 4; + ih->wptr_cpu = &adev->wb.wb[wptr_offs]; + ih->rptr_addr = adev->wb.gpu_addr + rptr_offs * 4; + ih->rptr_cpu = &adev->wb.wb[rptr_offs]; + } + + init_waitqueue_head(&ih->wait_process); + return 0; +} + +/** + * amdgpu_ih_ring_fini - tear down the IH state + * + * @adev: amdgpu_device pointer + * @ih: ih ring to tear down + * + * Tears down the IH state and frees buffer + * used for the IH ring buffer. + */ +void amdgpu_ih_ring_fini(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih) +{ + + if (!ih->ring) + return; + + if (ih->use_bus_addr) { + + /* add 8 bytes for the rptr/wptr shadows and + * add them to the end of the ring allocation. + */ + dma_free_coherent(adev->dev, ih->ring_size + 8, + (void *)ih->ring, ih->gpu_addr); + ih->ring = NULL; + } else { + amdgpu_bo_free_kernel(&ih->ring_obj, &ih->gpu_addr, + (void **)&ih->ring); + amdgpu_device_wb_free(adev, (ih->wptr_addr - ih->gpu_addr) / 4); + amdgpu_device_wb_free(adev, (ih->rptr_addr - ih->gpu_addr) / 4); + } +} + +/** + * amdgpu_ih_ring_write - write IV to the ring buffer + * + * @adev: amdgpu_device pointer + * @ih: ih ring to write to + * @iv: the iv to write + * @num_dw: size of the iv in dw + * + * Writes an IV to the ring buffer using the CPU and increment the wptr. + * Used for testing and delegating IVs to a software ring. + */ +void amdgpu_ih_ring_write(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih, + const uint32_t *iv, unsigned int num_dw) +{ + uint32_t wptr = le32_to_cpu(*ih->wptr_cpu) >> 2; + unsigned int i; + + for (i = 0; i < num_dw; ++i) + ih->ring[wptr++] = cpu_to_le32(iv[i]); + + wptr <<= 2; + wptr &= ih->ptr_mask; + + /* Only commit the new wptr if we don't overflow */ + if (wptr != READ_ONCE(ih->rptr)) { + wmb(); + WRITE_ONCE(*ih->wptr_cpu, cpu_to_le32(wptr)); + } else if (adev->irq.retry_cam_enabled) { + dev_warn_once(adev->dev, "IH soft ring buffer overflow 0x%X, 0x%X\n", + wptr, ih->rptr); + } +} + +/** + * amdgpu_ih_wait_on_checkpoint_process_ts - wait to process IVs up to checkpoint + * + * @adev: amdgpu_device pointer + * @ih: ih ring to process + * + * Used to ensure ring has processed IVs up to the checkpoint write pointer. + */ +int amdgpu_ih_wait_on_checkpoint_process_ts(struct amdgpu_device *adev, + struct amdgpu_ih_ring *ih) +{ + uint32_t checkpoint_wptr; + uint64_t checkpoint_ts; + long timeout = HZ; + + if (!ih->enabled || adev->shutdown) + return -ENODEV; + + checkpoint_wptr = amdgpu_ih_get_wptr(adev, ih); + /* Order wptr with ring data. */ + rmb(); + checkpoint_ts = amdgpu_ih_decode_iv_ts(adev, ih, checkpoint_wptr, -1); + + return wait_event_interruptible_timeout(ih->wait_process, + amdgpu_ih_ts_after(checkpoint_ts, ih->processed_timestamp) || + ih->rptr == amdgpu_ih_get_wptr(adev, ih), timeout); +} + +/** + * amdgpu_ih_process - interrupt handler + * + * @adev: amdgpu_device pointer + * @ih: ih ring to process + * + * Interrupt hander (VI), walk the IH ring. + * Returns irq process return code. + */ +int amdgpu_ih_process(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih) +{ + unsigned int count; + u32 wptr; + + if (!ih->enabled || adev->shutdown) + return IRQ_NONE; + + wptr = amdgpu_ih_get_wptr(adev, ih); + +restart_ih: + count = AMDGPU_IH_MAX_NUM_IVS; + DRM_DEBUG("%s: rptr %d, wptr %d\n", __func__, ih->rptr, wptr); + + /* Order reading of wptr vs. reading of IH ring data */ + rmb(); + + while (ih->rptr != wptr && --count) { + amdgpu_irq_dispatch(adev, ih); + ih->rptr &= ih->ptr_mask; + } + + amdgpu_ih_set_rptr(adev, ih); + wake_up_all(&ih->wait_process); + + /* make sure wptr hasn't changed while processing */ + wptr = amdgpu_ih_get_wptr(adev, ih); + if (wptr != ih->rptr) + goto restart_ih; + + return IRQ_HANDLED; +} + +/** + * amdgpu_ih_decode_iv_helper - decode an interrupt vector + * + * @adev: amdgpu_device pointer + * @ih: ih ring to process + * @entry: IV entry + * + * Decodes the interrupt vector at the current rptr + * position and also advance the position for Vega10 + * and later GPUs. + */ +void amdgpu_ih_decode_iv_helper(struct amdgpu_device *adev, + struct amdgpu_ih_ring *ih, + struct amdgpu_iv_entry *entry) +{ + /* wptr/rptr are in bytes! */ + u32 ring_index = ih->rptr >> 2; + uint32_t dw[8]; + + dw[0] = le32_to_cpu(ih->ring[ring_index + 0]); + dw[1] = le32_to_cpu(ih->ring[ring_index + 1]); + dw[2] = le32_to_cpu(ih->ring[ring_index + 2]); + dw[3] = le32_to_cpu(ih->ring[ring_index + 3]); + dw[4] = le32_to_cpu(ih->ring[ring_index + 4]); + dw[5] = le32_to_cpu(ih->ring[ring_index + 5]); + dw[6] = le32_to_cpu(ih->ring[ring_index + 6]); + dw[7] = le32_to_cpu(ih->ring[ring_index + 7]); + + entry->client_id = dw[0] & 0xff; + entry->src_id = (dw[0] >> 8) & 0xff; + entry->ring_id = (dw[0] >> 16) & 0xff; + entry->vmid = (dw[0] >> 24) & 0xf; + entry->vmid_src = (dw[0] >> 31); + entry->timestamp = dw[1] | ((u64)(dw[2] & 0xffff) << 32); + entry->timestamp_src = dw[2] >> 31; + entry->pasid = dw[3] & 0xffff; + entry->node_id = (dw[3] >> 16) & 0xff; + entry->src_data[0] = dw[4]; + entry->src_data[1] = dw[5]; + entry->src_data[2] = dw[6]; + entry->src_data[3] = dw[7]; + + /* wptr/rptr are in bytes! */ + ih->rptr += 32; +} + +uint64_t amdgpu_ih_decode_iv_ts_helper(struct amdgpu_ih_ring *ih, u32 rptr, + signed int offset) +{ + uint32_t iv_size = 32; + uint32_t ring_index; + uint32_t dw1, dw2; + + rptr += iv_size * offset; + ring_index = (rptr & ih->ptr_mask) >> 2; + + dw1 = le32_to_cpu(ih->ring[ring_index + 1]); + dw2 = le32_to_cpu(ih->ring[ring_index + 2]); + return dw1 | ((u64)(dw2 & 0xffff) << 32); +} |