// 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 <linux/slab.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-mapping.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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/*
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* Put the restart at the end of pushbuffer memory
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*/
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static void push_buffer_init(struct push_buffer *pb)
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{
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*(u32 *)(pb->mapped + pb->size) = host1x_opcode_restart(0);
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}
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/*
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* Increment timedout buffer's syncpt via CPU.
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*/
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static void cdma_timeout_cpu_incr(struct host1x_cdma *cdma, u32 getptr,
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u32 syncpt_incrs, u32 syncval, u32 nr_slots)
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{
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unsigned int i;
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for (i = 0; i < syncpt_incrs; i++)
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host1x_syncpt_incr(cdma->timeout.syncpt);
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/* after CPU incr, ensure shadow is up to date */
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host1x_syncpt_load(cdma->timeout.syncpt);
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}
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/*
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* Start channel DMA
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*/
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static void cdma_start(struct host1x_cdma *cdma)
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{
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struct host1x_channel *ch = cdma_to_channel(cdma);
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u64 start, end;
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if (cdma->running)
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return;
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cdma->last_pos = cdma->push_buffer.pos;
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start = cdma->push_buffer.dma;
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end = cdma->push_buffer.size + 4;
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host1x_ch_writel(ch, HOST1X_CHANNEL_DMACTRL_DMASTOP,
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HOST1X_CHANNEL_DMACTRL);
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/* set base, put and end pointer */
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host1x_ch_writel(ch, lower_32_bits(start), HOST1X_CHANNEL_DMASTART);
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#if HOST1X_HW >= 6
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host1x_ch_writel(ch, upper_32_bits(start), HOST1X_CHANNEL_DMASTART_HI);
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#endif
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host1x_ch_writel(ch, cdma->push_buffer.pos, HOST1X_CHANNEL_DMAPUT);
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#if HOST1X_HW >= 6
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host1x_ch_writel(ch, 0, HOST1X_CHANNEL_DMAPUT_HI);
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#endif
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host1x_ch_writel(ch, lower_32_bits(end), HOST1X_CHANNEL_DMAEND);
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#if HOST1X_HW >= 6
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host1x_ch_writel(ch, upper_32_bits(end), HOST1X_CHANNEL_DMAEND_HI);
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#endif
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/* reset GET */
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host1x_ch_writel(ch, HOST1X_CHANNEL_DMACTRL_DMASTOP |
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HOST1X_CHANNEL_DMACTRL_DMAGETRST |
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HOST1X_CHANNEL_DMACTRL_DMAINITGET,
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HOST1X_CHANNEL_DMACTRL);
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/* start the command DMA */
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host1x_ch_writel(ch, 0, HOST1X_CHANNEL_DMACTRL);
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cdma->running = true;
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}
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/*
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* Similar to cdma_start(), but rather than starting from an idle
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* state (where DMA GET is set to DMA PUT), on a timeout we restore
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* DMA GET from an explicit value (so DMA may again be pending).
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*/
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static void cdma_timeout_restart(struct host1x_cdma *cdma, u32 getptr)
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{
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struct host1x *host1x = cdma_to_host1x(cdma);
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struct host1x_channel *ch = cdma_to_channel(cdma);
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u64 start, end;
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if (cdma->running)
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return;
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cdma->last_pos = cdma->push_buffer.pos;
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host1x_ch_writel(ch, HOST1X_CHANNEL_DMACTRL_DMASTOP,
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HOST1X_CHANNEL_DMACTRL);
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start = cdma->push_buffer.dma;
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end = cdma->push_buffer.size + 4;
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/* set base, end pointer (all of memory) */
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host1x_ch_writel(ch, lower_32_bits(start), HOST1X_CHANNEL_DMASTART);
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#if HOST1X_HW >= 6
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host1x_ch_writel(ch, upper_32_bits(start), HOST1X_CHANNEL_DMASTART_HI);
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#endif
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host1x_ch_writel(ch, lower_32_bits(end), HOST1X_CHANNEL_DMAEND);
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#if HOST1X_HW >= 6
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host1x_ch_writel(ch, upper_32_bits(end), HOST1X_CHANNEL_DMAEND_HI);
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#endif
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/* set GET, by loading the value in PUT (then reset GET) */
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host1x_ch_writel(ch, getptr, HOST1X_CHANNEL_DMAPUT);
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host1x_ch_writel(ch, HOST1X_CHANNEL_DMACTRL_DMASTOP |
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HOST1X_CHANNEL_DMACTRL_DMAGETRST |
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HOST1X_CHANNEL_DMACTRL_DMAINITGET,
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HOST1X_CHANNEL_DMACTRL);
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dev_dbg(host1x->dev,
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"%s: DMA GET 0x%x, PUT HW 0x%x / shadow 0x%x\n", __func__,
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host1x_ch_readl(ch, HOST1X_CHANNEL_DMAGET),
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host1x_ch_readl(ch, HOST1X_CHANNEL_DMAPUT),
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cdma->last_pos);
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/* deassert GET reset and set PUT */
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host1x_ch_writel(ch, HOST1X_CHANNEL_DMACTRL_DMASTOP,
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HOST1X_CHANNEL_DMACTRL);
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host1x_ch_writel(ch, cdma->push_buffer.pos, HOST1X_CHANNEL_DMAPUT);
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/* start the command DMA */
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host1x_ch_writel(ch, 0, HOST1X_CHANNEL_DMACTRL);
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cdma->running = true;
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}
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/*
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* Kick channel DMA into action by writing its PUT offset (if it has changed)
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*/
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static void cdma_flush(struct host1x_cdma *cdma)
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{
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struct host1x_channel *ch = cdma_to_channel(cdma);
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if (cdma->push_buffer.pos != cdma->last_pos) {
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host1x_ch_writel(ch, cdma->push_buffer.pos,
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HOST1X_CHANNEL_DMAPUT);
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cdma->last_pos = cdma->push_buffer.pos;
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}
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}
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static void cdma_stop(struct host1x_cdma *cdma)
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{
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struct host1x_channel *ch = cdma_to_channel(cdma);
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mutex_lock(&cdma->lock);
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if (cdma->running) {
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host1x_cdma_wait_locked(cdma, CDMA_EVENT_SYNC_QUEUE_EMPTY);
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host1x_ch_writel(ch, HOST1X_CHANNEL_DMACTRL_DMASTOP,
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HOST1X_CHANNEL_DMACTRL);
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cdma->running = false;
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}
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mutex_unlock(&cdma->lock);
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}
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static void cdma_hw_cmdproc_stop(struct host1x *host, struct host1x_channel *ch,
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bool stop)
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{
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#if HOST1X_HW >= 6
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host1x_ch_writel(ch, stop ? 0x1 : 0x0, HOST1X_CHANNEL_CMDPROC_STOP);
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#else
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u32 cmdproc_stop = host1x_sync_readl(host, HOST1X_SYNC_CMDPROC_STOP);
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if (stop)
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cmdproc_stop |= BIT(ch->id);
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else
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cmdproc_stop &= ~BIT(ch->id);
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host1x_sync_writel(host, cmdproc_stop, HOST1X_SYNC_CMDPROC_STOP);
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#endif
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}
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static void cdma_hw_teardown(struct host1x *host, struct host1x_channel *ch)
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{
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#if HOST1X_HW >= 6
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host1x_ch_writel(ch, 0x1, HOST1X_CHANNEL_TEARDOWN);
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#else
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host1x_sync_writel(host, BIT(ch->id), HOST1X_SYNC_CH_TEARDOWN);
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#endif
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}
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/*
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* Stops both channel's command processor and CDMA immediately.
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* Also, tears down the channel and resets corresponding module.
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*/
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static void cdma_freeze(struct host1x_cdma *cdma)
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{
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struct host1x *host = cdma_to_host1x(cdma);
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struct host1x_channel *ch = cdma_to_channel(cdma);
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if (cdma->torndown && !cdma->running) {
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dev_warn(host->dev, "Already torn down\n");
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return;
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}
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dev_dbg(host->dev, "freezing channel (id %d)\n", ch->id);
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cdma_hw_cmdproc_stop(host, ch, true);
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dev_dbg(host->dev, "%s: DMA GET 0x%x, PUT HW 0x%x / shadow 0x%x\n",
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__func__, host1x_ch_readl(ch, HOST1X_CHANNEL_DMAGET),
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host1x_ch_readl(ch, HOST1X_CHANNEL_DMAPUT),
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cdma->last_pos);
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host1x_ch_writel(ch, HOST1X_CHANNEL_DMACTRL_DMASTOP,
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HOST1X_CHANNEL_DMACTRL);
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cdma_hw_teardown(host, ch);
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cdma->running = false;
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cdma->torndown = true;
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}
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static void cdma_resume(struct host1x_cdma *cdma, u32 getptr)
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{
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struct host1x *host1x = cdma_to_host1x(cdma);
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struct host1x_channel *ch = cdma_to_channel(cdma);
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dev_dbg(host1x->dev,
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"resuming channel (id %u, DMAGET restart = 0x%x)\n",
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ch->id, getptr);
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cdma_hw_cmdproc_stop(host1x, ch, false);
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cdma->torndown = false;
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cdma_timeout_restart(cdma, getptr);
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}
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/*
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* If this timeout fires, it indicates the current sync_queue entry has
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* exceeded its TTL and the userctx should be timed out and remaining
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* submits already issued cleaned up (future submits return an error).
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*/
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static void cdma_timeout_handler(struct work_struct *work)
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{
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u32 syncpt_val;
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struct host1x_cdma *cdma;
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struct host1x *host1x;
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struct host1x_channel *ch;
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cdma = container_of(to_delayed_work(work), struct host1x_cdma,
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timeout.wq);
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host1x = cdma_to_host1x(cdma);
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ch = cdma_to_channel(cdma);
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host1x_debug_dump(cdma_to_host1x(cdma));
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mutex_lock(&cdma->lock);
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if (!cdma->timeout.client) {
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dev_dbg(host1x->dev,
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"cdma_timeout: expired, but has no clientid\n");
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mutex_unlock(&cdma->lock);
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return;
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}
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/* stop processing to get a clean snapshot */
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cdma_hw_cmdproc_stop(host1x, ch, true);
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syncpt_val = host1x_syncpt_load(cdma->timeout.syncpt);
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/* has buffer actually completed? */
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if ((s32)(syncpt_val - cdma->timeout.syncpt_val) >= 0) {
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dev_dbg(host1x->dev,
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"cdma_timeout: expired, but buffer had completed\n");
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/* restore */
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cdma_hw_cmdproc_stop(host1x, ch, false);
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mutex_unlock(&cdma->lock);
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return;
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}
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dev_warn(host1x->dev, "%s: timeout: %u (%s), HW thresh %d, done %d\n",
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__func__, cdma->timeout.syncpt->id, cdma->timeout.syncpt->name,
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syncpt_val, cdma->timeout.syncpt_val);
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/* stop HW, resetting channel/module */
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host1x_hw_cdma_freeze(host1x, cdma);
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host1x_cdma_update_sync_queue(cdma, ch->dev);
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mutex_unlock(&cdma->lock);
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}
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/*
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* Init timeout resources
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*/
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static int cdma_timeout_init(struct host1x_cdma *cdma, unsigned int syncpt)
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{
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INIT_DELAYED_WORK(&cdma->timeout.wq, cdma_timeout_handler);
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cdma->timeout.initialized = true;
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return 0;
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}
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/*
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* Clean up timeout resources
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*/
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static void cdma_timeout_destroy(struct host1x_cdma *cdma)
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{
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if (cdma->timeout.initialized)
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cancel_delayed_work(&cdma->timeout.wq);
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cdma->timeout.initialized = false;
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}
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static const struct host1x_cdma_ops host1x_cdma_ops = {
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.start = cdma_start,
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.stop = cdma_stop,
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.flush = cdma_flush,
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.timeout_init = cdma_timeout_init,
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.timeout_destroy = cdma_timeout_destroy,
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.freeze = cdma_freeze,
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.resume = cdma_resume,
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.timeout_cpu_incr = cdma_timeout_cpu_incr,
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};
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static const struct host1x_pushbuffer_ops host1x_pushbuffer_ops = {
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.init = push_buffer_init,
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};
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