275 lines
7.7 KiB
C
275 lines
7.7 KiB
C
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/*
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* Copyright 2014 Advanced Micro Devices, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#include <drm/drmP.h>
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#include "amdgpu.h"
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#include "amdgpu_ih.h"
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#include "amdgpu_amdkfd.h"
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/**
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* amdgpu_ih_ring_alloc - allocate memory for the IH ring
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*
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* @adev: amdgpu_device pointer
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*
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* Allocate a ring buffer for the interrupt controller.
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* Returns 0 for success, errors for failure.
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*/
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static int amdgpu_ih_ring_alloc(struct amdgpu_device *adev)
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{
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int r;
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/* Allocate ring buffer */
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if (adev->irq.ih.ring_obj == NULL) {
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r = amdgpu_bo_create_kernel(adev, adev->irq.ih.ring_size,
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PAGE_SIZE, AMDGPU_GEM_DOMAIN_GTT,
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&adev->irq.ih.ring_obj,
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&adev->irq.ih.gpu_addr,
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(void **)&adev->irq.ih.ring);
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if (r) {
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DRM_ERROR("amdgpu: failed to create ih ring buffer (%d).\n", r);
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return r;
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}
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}
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return 0;
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}
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/**
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* amdgpu_ih_ring_init - initialize the IH state
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*
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* @adev: amdgpu_device pointer
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*
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* Initializes the IH state and allocates a buffer
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* for the IH ring buffer.
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* Returns 0 for success, errors for failure.
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*/
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int amdgpu_ih_ring_init(struct amdgpu_device *adev, unsigned ring_size,
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bool use_bus_addr)
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{
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u32 rb_bufsz;
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int r;
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/* Align ring size */
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rb_bufsz = order_base_2(ring_size / 4);
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ring_size = (1 << rb_bufsz) * 4;
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adev->irq.ih.ring_size = ring_size;
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adev->irq.ih.ptr_mask = adev->irq.ih.ring_size - 1;
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adev->irq.ih.rptr = 0;
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adev->irq.ih.use_bus_addr = use_bus_addr;
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if (adev->irq.ih.use_bus_addr) {
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if (!adev->irq.ih.ring) {
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/* add 8 bytes for the rptr/wptr shadows and
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* add them to the end of the ring allocation.
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*/
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adev->irq.ih.ring = pci_alloc_consistent(adev->pdev,
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adev->irq.ih.ring_size + 8,
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&adev->irq.ih.rb_dma_addr);
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if (adev->irq.ih.ring == NULL)
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return -ENOMEM;
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memset((void *)adev->irq.ih.ring, 0, adev->irq.ih.ring_size + 8);
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adev->irq.ih.wptr_offs = (adev->irq.ih.ring_size / 4) + 0;
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adev->irq.ih.rptr_offs = (adev->irq.ih.ring_size / 4) + 1;
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}
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return 0;
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} else {
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r = amdgpu_device_wb_get(adev, &adev->irq.ih.wptr_offs);
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if (r) {
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dev_err(adev->dev, "(%d) ih wptr_offs wb alloc failed\n", r);
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return r;
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}
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r = amdgpu_device_wb_get(adev, &adev->irq.ih.rptr_offs);
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if (r) {
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amdgpu_device_wb_free(adev, adev->irq.ih.wptr_offs);
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dev_err(adev->dev, "(%d) ih rptr_offs wb alloc failed\n", r);
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return r;
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}
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return amdgpu_ih_ring_alloc(adev);
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}
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}
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/**
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* amdgpu_ih_ring_fini - tear down the IH state
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*
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* @adev: amdgpu_device pointer
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*
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* Tears down the IH state and frees buffer
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* used for the IH ring buffer.
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*/
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void amdgpu_ih_ring_fini(struct amdgpu_device *adev)
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{
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if (adev->irq.ih.use_bus_addr) {
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if (adev->irq.ih.ring) {
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/* add 8 bytes for the rptr/wptr shadows and
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* add them to the end of the ring allocation.
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*/
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pci_free_consistent(adev->pdev, adev->irq.ih.ring_size + 8,
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(void *)adev->irq.ih.ring,
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adev->irq.ih.rb_dma_addr);
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adev->irq.ih.ring = NULL;
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}
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} else {
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amdgpu_bo_free_kernel(&adev->irq.ih.ring_obj,
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&adev->irq.ih.gpu_addr,
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(void **)&adev->irq.ih.ring);
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amdgpu_device_wb_free(adev, adev->irq.ih.wptr_offs);
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amdgpu_device_wb_free(adev, adev->irq.ih.rptr_offs);
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}
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}
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/**
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* amdgpu_ih_process - interrupt handler
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*
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* @adev: amdgpu_device pointer
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*
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* Interrupt hander (VI), walk the IH ring.
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* Returns irq process return code.
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*/
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int amdgpu_ih_process(struct amdgpu_device *adev)
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{
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struct amdgpu_iv_entry entry;
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u32 wptr;
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if (!adev->irq.ih.enabled || adev->shutdown)
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return IRQ_NONE;
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wptr = amdgpu_ih_get_wptr(adev);
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restart_ih:
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/* is somebody else already processing irqs? */
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if (atomic_xchg(&adev->irq.ih.lock, 1))
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return IRQ_NONE;
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DRM_DEBUG("%s: rptr %d, wptr %d\n", __func__, adev->irq.ih.rptr, wptr);
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/* Order reading of wptr vs. reading of IH ring data */
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rmb();
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while (adev->irq.ih.rptr != wptr) {
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u32 ring_index = adev->irq.ih.rptr >> 2;
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/* Prescreening of high-frequency interrupts */
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if (!amdgpu_ih_prescreen_iv(adev)) {
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adev->irq.ih.rptr &= adev->irq.ih.ptr_mask;
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continue;
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}
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/* Before dispatching irq to IP blocks, send it to amdkfd */
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amdgpu_amdkfd_interrupt(adev,
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(const void *) &adev->irq.ih.ring[ring_index]);
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entry.iv_entry = (const uint32_t *)
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&adev->irq.ih.ring[ring_index];
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amdgpu_ih_decode_iv(adev, &entry);
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adev->irq.ih.rptr &= adev->irq.ih.ptr_mask;
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amdgpu_irq_dispatch(adev, &entry);
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}
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amdgpu_ih_set_rptr(adev);
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atomic_set(&adev->irq.ih.lock, 0);
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/* make sure wptr hasn't changed while processing */
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wptr = amdgpu_ih_get_wptr(adev);
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if (wptr != adev->irq.ih.rptr)
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goto restart_ih;
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return IRQ_HANDLED;
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}
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/**
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* amdgpu_ih_add_fault - Add a page fault record
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*
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* @adev: amdgpu device pointer
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* @key: 64-bit encoding of PASID and address
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*
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* This should be called when a retry page fault interrupt is
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* received. If this is a new page fault, it will be added to a hash
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* table. The return value indicates whether this is a new fault, or
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* a fault that was already known and is already being handled.
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*
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* If there are too many pending page faults, this will fail. Retry
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* interrupts should be ignored in this case until there is enough
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* free space.
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*
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* Returns 0 if the fault was added, 1 if the fault was already known,
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* -ENOSPC if there are too many pending faults.
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*/
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int amdgpu_ih_add_fault(struct amdgpu_device *adev, u64 key)
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{
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unsigned long flags;
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int r = -ENOSPC;
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if (WARN_ON_ONCE(!adev->irq.ih.faults))
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/* Should be allocated in <IP>_ih_sw_init on GPUs that
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* support retry faults and require retry filtering.
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*/
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return r;
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spin_lock_irqsave(&adev->irq.ih.faults->lock, flags);
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/* Only let the hash table fill up to 50% for best performance */
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if (adev->irq.ih.faults->count >= (1 << (AMDGPU_PAGEFAULT_HASH_BITS-1)))
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goto unlock_out;
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r = chash_table_copy_in(&adev->irq.ih.faults->hash, key, NULL);
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if (!r)
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adev->irq.ih.faults->count++;
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/* chash_table_copy_in should never fail unless we're losing count */
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WARN_ON_ONCE(r < 0);
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unlock_out:
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spin_unlock_irqrestore(&adev->irq.ih.faults->lock, flags);
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return r;
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}
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/**
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* amdgpu_ih_clear_fault - Remove a page fault record
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*
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* @adev: amdgpu device pointer
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* @key: 64-bit encoding of PASID and address
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*
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* This should be called when a page fault has been handled. Any
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* future interrupt with this key will be processed as a new
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* page fault.
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*/
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void amdgpu_ih_clear_fault(struct amdgpu_device *adev, u64 key)
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{
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unsigned long flags;
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int r;
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if (!adev->irq.ih.faults)
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return;
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spin_lock_irqsave(&adev->irq.ih.faults->lock, flags);
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r = chash_table_remove(&adev->irq.ih.faults->hash, key, NULL);
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if (!WARN_ON_ONCE(r < 0)) {
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adev->irq.ih.faults->count--;
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WARN_ON_ONCE(adev->irq.ih.faults->count < 0);
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}
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spin_unlock_irqrestore(&adev->irq.ih.faults->lock, flags);
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}
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