b40034994f
The variable space is being initialized with a value that is never read, it is being re-assigned later on. The initialization is redundant and can be removed. Also merge two declaration lines together. Cleans up clang scan build warning: drivers/gpu/host1x/cdma.c:628:15: warning: Value stored to 'space' during its initialization is never read [deadcode.DeadStores] Signed-off-by: Colin Ian King <colin.i.king@gmail.com> Signed-off-by: Thierry Reding <treding@nvidia.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240215224301.2073845-1-colin.i.king@gmail.com
693 lines
16 KiB
C
693 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Tegra host1x Command DMA
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*
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* Copyright (c) 2010-2013, NVIDIA Corporation.
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*/
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#include <asm/cacheflush.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/host1x.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/kfifo.h>
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#include <linux/slab.h>
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#include <trace/events/host1x.h>
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#include "cdma.h"
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#include "channel.h"
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#include "dev.h"
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#include "debug.h"
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#include "job.h"
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/*
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* push_buffer
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*
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* The push buffer is a circular array of words to be fetched by command DMA.
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* Note that it works slightly differently to the sync queue; fence == pos
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* means that the push buffer is full, not empty.
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*/
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/*
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* Typically the commands written into the push buffer are a pair of words. We
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* use slots to represent each of these pairs and to simplify things. Note the
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* strange number of slots allocated here. 512 slots will fit exactly within a
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* single memory page. We also need one additional word at the end of the push
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* buffer for the RESTART opcode that will instruct the CDMA to jump back to
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* the beginning of the push buffer. With 512 slots, this means that we'll use
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* 2 memory pages and waste 4092 bytes of the second page that will never be
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* used.
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*/
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#define HOST1X_PUSHBUFFER_SLOTS 511
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/*
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* Clean up push buffer resources
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*/
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static void host1x_pushbuffer_destroy(struct push_buffer *pb)
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{
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struct host1x_cdma *cdma = pb_to_cdma(pb);
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struct host1x *host1x = cdma_to_host1x(cdma);
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if (!pb->mapped)
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return;
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if (host1x->domain) {
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iommu_unmap(host1x->domain, pb->dma, pb->alloc_size);
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free_iova(&host1x->iova, iova_pfn(&host1x->iova, pb->dma));
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}
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dma_free_wc(host1x->dev, pb->alloc_size, pb->mapped, pb->phys);
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pb->mapped = NULL;
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pb->phys = 0;
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}
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/*
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* Init push buffer resources
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*/
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static int host1x_pushbuffer_init(struct push_buffer *pb)
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{
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struct host1x_cdma *cdma = pb_to_cdma(pb);
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struct host1x *host1x = cdma_to_host1x(cdma);
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struct iova *alloc;
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u32 size;
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int err;
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pb->mapped = NULL;
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pb->phys = 0;
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pb->size = HOST1X_PUSHBUFFER_SLOTS * 8;
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size = pb->size + 4;
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/* initialize buffer pointers */
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pb->fence = pb->size - 8;
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pb->pos = 0;
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if (host1x->domain) {
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unsigned long shift;
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size = iova_align(&host1x->iova, size);
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pb->mapped = dma_alloc_wc(host1x->dev, size, &pb->phys,
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GFP_KERNEL);
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if (!pb->mapped)
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return -ENOMEM;
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shift = iova_shift(&host1x->iova);
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alloc = alloc_iova(&host1x->iova, size >> shift,
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host1x->iova_end >> shift, true);
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if (!alloc) {
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err = -ENOMEM;
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goto iommu_free_mem;
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}
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pb->dma = iova_dma_addr(&host1x->iova, alloc);
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err = iommu_map(host1x->domain, pb->dma, pb->phys, size,
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IOMMU_READ, GFP_KERNEL);
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if (err)
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goto iommu_free_iova;
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} else {
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pb->mapped = dma_alloc_wc(host1x->dev, size, &pb->phys,
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GFP_KERNEL);
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if (!pb->mapped)
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return -ENOMEM;
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pb->dma = pb->phys;
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}
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pb->alloc_size = size;
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host1x_hw_pushbuffer_init(host1x, pb);
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return 0;
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iommu_free_iova:
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__free_iova(&host1x->iova, alloc);
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iommu_free_mem:
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dma_free_wc(host1x->dev, size, pb->mapped, pb->phys);
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return err;
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}
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/*
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* Push two words to the push buffer
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* Caller must ensure push buffer is not full
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*/
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static void host1x_pushbuffer_push(struct push_buffer *pb, u32 op1, u32 op2)
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{
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u32 *p = (u32 *)((void *)pb->mapped + pb->pos);
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WARN_ON(pb->pos == pb->fence);
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*(p++) = op1;
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*(p++) = op2;
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pb->pos += 8;
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if (pb->pos >= pb->size)
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pb->pos -= pb->size;
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}
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/*
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* Pop a number of two word slots from the push buffer
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* Caller must ensure push buffer is not empty
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*/
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static void host1x_pushbuffer_pop(struct push_buffer *pb, unsigned int slots)
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{
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/* Advance the next write position */
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pb->fence += slots * 8;
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if (pb->fence >= pb->size)
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pb->fence -= pb->size;
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}
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/*
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* Return the number of two word slots free in the push buffer
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*/
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static u32 host1x_pushbuffer_space(struct push_buffer *pb)
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{
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unsigned int fence = pb->fence;
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if (pb->fence < pb->pos)
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fence += pb->size;
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return (fence - pb->pos) / 8;
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}
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/*
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* Sleep (if necessary) until the requested event happens
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* - CDMA_EVENT_SYNC_QUEUE_EMPTY : sync queue is completely empty.
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* - Returns 1
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* - CDMA_EVENT_PUSH_BUFFER_SPACE : there is space in the push buffer
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* - Return the amount of space (> 0)
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* Must be called with the cdma lock held.
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*/
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unsigned int host1x_cdma_wait_locked(struct host1x_cdma *cdma,
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enum cdma_event event)
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{
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for (;;) {
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struct push_buffer *pb = &cdma->push_buffer;
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unsigned int space;
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switch (event) {
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case CDMA_EVENT_SYNC_QUEUE_EMPTY:
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space = list_empty(&cdma->sync_queue) ? 1 : 0;
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break;
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case CDMA_EVENT_PUSH_BUFFER_SPACE:
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space = host1x_pushbuffer_space(pb);
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break;
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default:
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WARN_ON(1);
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return -EINVAL;
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}
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if (space)
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return space;
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trace_host1x_wait_cdma(dev_name(cdma_to_channel(cdma)->dev),
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event);
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/* If somebody has managed to already start waiting, yield */
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if (cdma->event != CDMA_EVENT_NONE) {
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mutex_unlock(&cdma->lock);
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schedule();
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mutex_lock(&cdma->lock);
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continue;
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}
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cdma->event = event;
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mutex_unlock(&cdma->lock);
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wait_for_completion(&cdma->complete);
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mutex_lock(&cdma->lock);
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}
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return 0;
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}
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/*
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* Sleep (if necessary) until the push buffer has enough free space.
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*
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* Must be called with the cdma lock held.
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*/
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static int host1x_cdma_wait_pushbuffer_space(struct host1x *host1x,
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struct host1x_cdma *cdma,
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unsigned int needed)
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{
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while (true) {
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struct push_buffer *pb = &cdma->push_buffer;
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unsigned int space;
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space = host1x_pushbuffer_space(pb);
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if (space >= needed)
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break;
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trace_host1x_wait_cdma(dev_name(cdma_to_channel(cdma)->dev),
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CDMA_EVENT_PUSH_BUFFER_SPACE);
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host1x_hw_cdma_flush(host1x, cdma);
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/* If somebody has managed to already start waiting, yield */
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if (cdma->event != CDMA_EVENT_NONE) {
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mutex_unlock(&cdma->lock);
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schedule();
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mutex_lock(&cdma->lock);
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continue;
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}
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cdma->event = CDMA_EVENT_PUSH_BUFFER_SPACE;
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mutex_unlock(&cdma->lock);
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wait_for_completion(&cdma->complete);
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mutex_lock(&cdma->lock);
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}
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return 0;
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}
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/*
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* Start timer that tracks the time spent by the job.
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* Must be called with the cdma lock held.
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*/
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static void cdma_start_timer_locked(struct host1x_cdma *cdma,
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struct host1x_job *job)
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{
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if (cdma->timeout.client) {
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/* timer already started */
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return;
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}
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cdma->timeout.client = job->client;
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cdma->timeout.syncpt = job->syncpt;
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cdma->timeout.syncpt_val = job->syncpt_end;
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cdma->timeout.start_ktime = ktime_get();
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schedule_delayed_work(&cdma->timeout.wq,
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msecs_to_jiffies(job->timeout));
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}
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/*
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* Stop timer when a buffer submission completes.
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* Must be called with the cdma lock held.
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*/
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static void stop_cdma_timer_locked(struct host1x_cdma *cdma)
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{
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cancel_delayed_work(&cdma->timeout.wq);
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cdma->timeout.client = NULL;
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}
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/*
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* For all sync queue entries that have already finished according to the
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* current sync point registers:
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* - unpin & unref their mems
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* - pop their push buffer slots
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* - remove them from the sync queue
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* This is normally called from the host code's worker thread, but can be
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* called manually if necessary.
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* Must be called with the cdma lock held.
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*/
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static void update_cdma_locked(struct host1x_cdma *cdma)
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{
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bool signal = false;
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struct host1x_job *job, *n;
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/*
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* Walk the sync queue, reading the sync point registers as necessary,
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* to consume as many sync queue entries as possible without blocking
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*/
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list_for_each_entry_safe(job, n, &cdma->sync_queue, list) {
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struct host1x_syncpt *sp = job->syncpt;
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/* Check whether this syncpt has completed, and bail if not */
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if (!host1x_syncpt_is_expired(sp, job->syncpt_end) &&
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!job->cancelled) {
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/* Start timer on next pending syncpt */
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if (job->timeout)
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cdma_start_timer_locked(cdma, job);
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break;
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}
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/* Cancel timeout, when a buffer completes */
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if (cdma->timeout.client)
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stop_cdma_timer_locked(cdma);
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/* Unpin the memory */
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host1x_job_unpin(job);
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/* Pop push buffer slots */
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if (job->num_slots) {
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struct push_buffer *pb = &cdma->push_buffer;
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host1x_pushbuffer_pop(pb, job->num_slots);
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if (cdma->event == CDMA_EVENT_PUSH_BUFFER_SPACE)
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signal = true;
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}
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list_del(&job->list);
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host1x_job_put(job);
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}
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if (cdma->event == CDMA_EVENT_SYNC_QUEUE_EMPTY &&
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list_empty(&cdma->sync_queue))
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signal = true;
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if (signal) {
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cdma->event = CDMA_EVENT_NONE;
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complete(&cdma->complete);
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}
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}
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void host1x_cdma_update_sync_queue(struct host1x_cdma *cdma,
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struct device *dev)
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{
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struct host1x *host1x = cdma_to_host1x(cdma);
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u32 restart_addr, syncpt_incrs, syncpt_val;
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struct host1x_job *job, *next_job = NULL;
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syncpt_val = host1x_syncpt_load(cdma->timeout.syncpt);
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dev_dbg(dev, "%s: starting cleanup (thresh %d)\n",
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__func__, syncpt_val);
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/*
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* Move the sync_queue read pointer to the first entry that hasn't
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* completed based on the current HW syncpt value. It's likely there
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* won't be any (i.e. we're still at the head), but covers the case
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* where a syncpt incr happens just prior/during the teardown.
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*/
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dev_dbg(dev, "%s: skip completed buffers still in sync_queue\n",
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__func__);
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list_for_each_entry(job, &cdma->sync_queue, list) {
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if (syncpt_val < job->syncpt_end) {
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if (!list_is_last(&job->list, &cdma->sync_queue))
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next_job = list_next_entry(job, list);
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goto syncpt_incr;
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}
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host1x_job_dump(dev, job);
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}
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/* all jobs have been completed */
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job = NULL;
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syncpt_incr:
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/*
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* Increment with CPU the remaining syncpts of a partially executed job.
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*
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* CDMA will continue execution starting with the next job or will get
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* into idle state.
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*/
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if (next_job)
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restart_addr = next_job->first_get;
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else
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restart_addr = cdma->last_pos;
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if (!job)
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goto resume;
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/* do CPU increments for the remaining syncpts */
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if (job->syncpt_recovery) {
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dev_dbg(dev, "%s: perform CPU incr on pending buffers\n",
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__func__);
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/* won't need a timeout when replayed */
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job->timeout = 0;
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syncpt_incrs = job->syncpt_end - syncpt_val;
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dev_dbg(dev, "%s: CPU incr (%d)\n", __func__, syncpt_incrs);
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host1x_job_dump(dev, job);
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/* safe to use CPU to incr syncpts */
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host1x_hw_cdma_timeout_cpu_incr(host1x, cdma, job->first_get,
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syncpt_incrs, job->syncpt_end,
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job->num_slots);
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dev_dbg(dev, "%s: finished sync_queue modification\n",
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__func__);
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} else {
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struct host1x_job *failed_job = job;
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host1x_job_dump(dev, job);
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host1x_syncpt_set_locked(job->syncpt);
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failed_job->cancelled = true;
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list_for_each_entry_continue(job, &cdma->sync_queue, list) {
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unsigned int i;
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if (job->syncpt != failed_job->syncpt)
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continue;
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for (i = 0; i < job->num_slots; i++) {
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unsigned int slot = (job->first_get/8 + i) %
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HOST1X_PUSHBUFFER_SLOTS;
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u32 *mapped = cdma->push_buffer.mapped;
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/*
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* Overwrite opcodes with 0 word writes
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* to offset 0xbad. This does nothing but
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* has a easily detected signature in debug
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* traces.
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*
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* On systems with MLOCK enforcement enabled,
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* the above 0 word writes would fall foul of
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* the enforcement. As such, in the first slot
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* put a RESTART_W opcode to the beginning
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* of the next job. We don't use this for older
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* chips since those only support the RESTART
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* opcode with inconvenient alignment requirements.
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*/
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if (i == 0 && host1x->info->has_wide_gather) {
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unsigned int next_job = (job->first_get/8 + job->num_slots)
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% HOST1X_PUSHBUFFER_SLOTS;
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mapped[2*slot+0] = (0xd << 28) | (next_job * 2);
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mapped[2*slot+1] = 0x0;
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} else {
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mapped[2*slot+0] = 0x1bad0000;
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mapped[2*slot+1] = 0x1bad0000;
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}
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}
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job->cancelled = true;
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}
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wmb();
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update_cdma_locked(cdma);
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}
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resume:
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/* roll back DMAGET and start up channel again */
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host1x_hw_cdma_resume(host1x, cdma, restart_addr);
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}
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static void cdma_update_work(struct work_struct *work)
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{
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struct host1x_cdma *cdma = container_of(work, struct host1x_cdma, update_work);
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mutex_lock(&cdma->lock);
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update_cdma_locked(cdma);
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mutex_unlock(&cdma->lock);
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}
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/*
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* Create a cdma
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*/
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int host1x_cdma_init(struct host1x_cdma *cdma)
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{
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int err;
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mutex_init(&cdma->lock);
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init_completion(&cdma->complete);
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INIT_WORK(&cdma->update_work, cdma_update_work);
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INIT_LIST_HEAD(&cdma->sync_queue);
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cdma->event = CDMA_EVENT_NONE;
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cdma->running = false;
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cdma->torndown = false;
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err = host1x_pushbuffer_init(&cdma->push_buffer);
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if (err)
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return err;
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return 0;
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}
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/*
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* Destroy a cdma
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*/
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int host1x_cdma_deinit(struct host1x_cdma *cdma)
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{
|
|
struct push_buffer *pb = &cdma->push_buffer;
|
|
struct host1x *host1x = cdma_to_host1x(cdma);
|
|
|
|
if (cdma->running) {
|
|
pr_warn("%s: CDMA still running\n", __func__);
|
|
return -EBUSY;
|
|
}
|
|
|
|
host1x_pushbuffer_destroy(pb);
|
|
host1x_hw_cdma_timeout_destroy(host1x, cdma);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Begin a cdma submit
|
|
*/
|
|
int host1x_cdma_begin(struct host1x_cdma *cdma, struct host1x_job *job)
|
|
{
|
|
struct host1x *host1x = cdma_to_host1x(cdma);
|
|
|
|
mutex_lock(&cdma->lock);
|
|
|
|
/*
|
|
* Check if syncpoint was locked due to previous job timeout.
|
|
* This needs to be done within the cdma lock to avoid a race
|
|
* with the timeout handler.
|
|
*/
|
|
if (job->syncpt->locked) {
|
|
mutex_unlock(&cdma->lock);
|
|
return -EPERM;
|
|
}
|
|
|
|
if (job->timeout) {
|
|
/* init state on first submit with timeout value */
|
|
if (!cdma->timeout.initialized) {
|
|
int err;
|
|
|
|
err = host1x_hw_cdma_timeout_init(host1x, cdma);
|
|
if (err) {
|
|
mutex_unlock(&cdma->lock);
|
|
return err;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!cdma->running)
|
|
host1x_hw_cdma_start(host1x, cdma);
|
|
|
|
cdma->slots_free = 0;
|
|
cdma->slots_used = 0;
|
|
cdma->first_get = cdma->push_buffer.pos;
|
|
|
|
trace_host1x_cdma_begin(dev_name(job->channel->dev));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Push two words into a push buffer slot
|
|
* Blocks as necessary if the push buffer is full.
|
|
*/
|
|
void host1x_cdma_push(struct host1x_cdma *cdma, u32 op1, u32 op2)
|
|
{
|
|
struct host1x *host1x = cdma_to_host1x(cdma);
|
|
struct push_buffer *pb = &cdma->push_buffer;
|
|
u32 slots_free = cdma->slots_free;
|
|
|
|
if (host1x_debug_trace_cmdbuf)
|
|
trace_host1x_cdma_push(dev_name(cdma_to_channel(cdma)->dev),
|
|
op1, op2);
|
|
|
|
if (slots_free == 0) {
|
|
host1x_hw_cdma_flush(host1x, cdma);
|
|
slots_free = host1x_cdma_wait_locked(cdma,
|
|
CDMA_EVENT_PUSH_BUFFER_SPACE);
|
|
}
|
|
|
|
cdma->slots_free = slots_free - 1;
|
|
cdma->slots_used++;
|
|
host1x_pushbuffer_push(pb, op1, op2);
|
|
}
|
|
|
|
/*
|
|
* Push four words into two consecutive push buffer slots. Note that extra
|
|
* care needs to be taken not to split the two slots across the end of the
|
|
* push buffer. Otherwise the RESTART opcode at the end of the push buffer
|
|
* that ensures processing will restart at the beginning will break up the
|
|
* four words.
|
|
*
|
|
* Blocks as necessary if the push buffer is full.
|
|
*/
|
|
void host1x_cdma_push_wide(struct host1x_cdma *cdma, u32 op1, u32 op2,
|
|
u32 op3, u32 op4)
|
|
{
|
|
struct host1x_channel *channel = cdma_to_channel(cdma);
|
|
struct host1x *host1x = cdma_to_host1x(cdma);
|
|
struct push_buffer *pb = &cdma->push_buffer;
|
|
unsigned int space, needed = 2, extra = 0;
|
|
|
|
if (host1x_debug_trace_cmdbuf)
|
|
trace_host1x_cdma_push_wide(dev_name(channel->dev), op1, op2,
|
|
op3, op4);
|
|
|
|
/* compute number of extra slots needed for padding */
|
|
if (pb->pos + 16 > pb->size) {
|
|
extra = (pb->size - pb->pos) / 8;
|
|
needed += extra;
|
|
}
|
|
|
|
host1x_cdma_wait_pushbuffer_space(host1x, cdma, needed);
|
|
space = host1x_pushbuffer_space(pb);
|
|
|
|
cdma->slots_free = space - needed;
|
|
cdma->slots_used += needed;
|
|
|
|
if (extra > 0) {
|
|
/*
|
|
* If there isn't enough space at the tail of the pushbuffer,
|
|
* insert a RESTART(0) here to go back to the beginning.
|
|
* The code above adjusted the indexes appropriately.
|
|
*/
|
|
host1x_pushbuffer_push(pb, (0x5 << 28), 0xdead0000);
|
|
}
|
|
|
|
host1x_pushbuffer_push(pb, op1, op2);
|
|
host1x_pushbuffer_push(pb, op3, op4);
|
|
}
|
|
|
|
/*
|
|
* End a cdma submit
|
|
* Kick off DMA, add job to the sync queue, and a number of slots to be freed
|
|
* from the pushbuffer. The handles for a submit must all be pinned at the same
|
|
* time, but they can be unpinned in smaller chunks.
|
|
*/
|
|
void host1x_cdma_end(struct host1x_cdma *cdma,
|
|
struct host1x_job *job)
|
|
{
|
|
struct host1x *host1x = cdma_to_host1x(cdma);
|
|
bool idle = list_empty(&cdma->sync_queue);
|
|
|
|
host1x_hw_cdma_flush(host1x, cdma);
|
|
|
|
job->first_get = cdma->first_get;
|
|
job->num_slots = cdma->slots_used;
|
|
host1x_job_get(job);
|
|
list_add_tail(&job->list, &cdma->sync_queue);
|
|
|
|
/* start timer on idle -> active transitions */
|
|
if (job->timeout && idle)
|
|
cdma_start_timer_locked(cdma, job);
|
|
|
|
trace_host1x_cdma_end(dev_name(job->channel->dev));
|
|
mutex_unlock(&cdma->lock);
|
|
}
|
|
|
|
/*
|
|
* Update cdma state according to current sync point values
|
|
*/
|
|
void host1x_cdma_update(struct host1x_cdma *cdma)
|
|
{
|
|
schedule_work(&cdma->update_work);
|
|
}
|