msm_ringbuffer.c 16.1 KB
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/* -*- mode: C; c-file-style: "k&r"; tab-width 4; indent-tabs-mode: t; -*- */

/*
 * Copyright (C) 2013 Rob Clark <robclark@freedesktop.org>
 *
 * 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 (including the next
 * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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:
 *    Rob Clark <robclark@freedesktop.org>
 */

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#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

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#include <assert.h>
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#include <inttypes.h>
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#include "freedreno_ringbuffer.h"
#include "msm_priv.h"

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/* represents a single cmd buffer in the submit ioctl.  Each cmd buffer has
 * a backing bo, and a reloc table.
 */
struct msm_cmd {
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	struct list_head list;

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	struct fd_ringbuffer *ring;
	struct fd_bo *ring_bo;

	/* reloc's table: */
	struct drm_msm_gem_submit_reloc *relocs;
	uint32_t nr_relocs, max_relocs;
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	uint32_t size;
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};

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struct msm_ringbuffer {
	struct fd_ringbuffer base;

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	/* submit ioctl related tables:
	 * Note that bos and cmds are tracked by the parent ringbuffer, since
	 * that is global to the submit ioctl call.  The reloc's table is tracked
	 * per cmd-buffer.
	 */
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	struct {
		/* bo's table: */
		struct drm_msm_gem_submit_bo *bos;
		uint32_t nr_bos, max_bos;

		/* cmd's table: */
		struct drm_msm_gem_submit_cmd *cmds;
		uint32_t nr_cmds, max_cmds;
	} submit;

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	/* should have matching entries in submit.bos: */
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	/* Note, only in parent ringbuffer */
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	struct fd_bo **bos;
	uint32_t nr_bos, max_bos;

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	/* should have matching entries in submit.cmds: */
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	struct msm_cmd **cmds;
	uint32_t nr_cmds, max_cmds;

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	/* List of physical cmdstream buffers (msm_cmd) assocated with this
	 * logical fd_ringbuffer.
	 *
	 * Note that this is different from msm_ringbuffer::cmds (which
	 * shadows msm_ringbuffer::submit::cmds for tracking submit ioctl
	 * related stuff, and *only* is tracked in the parent ringbuffer.
	 * And only has "completed" cmd buffers (ie. we already know the
	 * size) added via get_cmd().
	 */
	struct list_head cmd_list;

	int is_growable;
	unsigned cmd_count;
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	unsigned seqno;

	/* maps fd_bo to idx: */
	void *bo_table;
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};

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static inline struct msm_ringbuffer * to_msm_ringbuffer(struct fd_ringbuffer *x)
{
	return (struct msm_ringbuffer *)x;
}

#define INIT_SIZE 0x1000

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static pthread_mutex_t idx_lock = PTHREAD_MUTEX_INITIALIZER;
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drm_private extern pthread_mutex_t table_lock;

static void ring_bo_del(struct fd_device *dev, struct fd_bo *bo)
{
	int ret;

	pthread_mutex_lock(&table_lock);
	ret = fd_bo_cache_free(&to_msm_device(dev)->ring_cache, bo);
	pthread_mutex_unlock(&table_lock);

	if (ret == 0)
		return;

	fd_bo_del(bo);
}

static struct fd_bo * ring_bo_new(struct fd_device *dev, uint32_t size)
{
	struct fd_bo *bo;

	bo = fd_bo_cache_alloc(&to_msm_device(dev)->ring_cache, &size, 0);
	if (bo)
		return bo;

	bo = fd_bo_new(dev, size, 0);
	if (!bo)
		return NULL;

	/* keep ringbuffer bo's out of the normal bo cache: */
	bo->bo_reuse = FALSE;

	return bo;
}
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static void ring_cmd_del(struct msm_cmd *cmd)
{
	if (cmd->ring_bo)
		ring_bo_del(cmd->ring->pipe->dev, cmd->ring_bo);
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	list_del(&cmd->list);
	to_msm_ringbuffer(cmd->ring)->cmd_count--;
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	free(cmd->relocs);
	free(cmd);
}

static struct msm_cmd * ring_cmd_new(struct fd_ringbuffer *ring, uint32_t size)
{
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	struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
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	struct msm_cmd *cmd = calloc(1, sizeof(*cmd));

	if (!cmd)
		return NULL;

	cmd->ring = ring;
	cmd->ring_bo = ring_bo_new(ring->pipe->dev, size);
	if (!cmd->ring_bo)
		goto fail;

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	list_addtail(&cmd->list, &msm_ring->cmd_list);
	msm_ring->cmd_count++;

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	return cmd;

fail:
	ring_cmd_del(cmd);
	return NULL;
}

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static void *grow(void *ptr, uint32_t nr, uint32_t *max, uint32_t sz)
{
	if ((nr + 1) > *max) {
		if ((*max * 2) < (nr + 1))
			*max = nr + 5;
		else
			*max = *max * 2;
		ptr = realloc(ptr, *max * sz);
	}
	return ptr;
}

#define APPEND(x, name) ({ \
	(x)->name = grow((x)->name, (x)->nr_ ## name, &(x)->max_ ## name, sizeof((x)->name[0])); \
	(x)->nr_ ## name ++; \
})

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static struct msm_cmd *current_cmd(struct fd_ringbuffer *ring)
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{
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	struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
	assert(!LIST_IS_EMPTY(&msm_ring->cmd_list));
	return LIST_LAST_ENTRY(&msm_ring->cmd_list, struct msm_cmd, list);
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}

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static uint32_t append_bo(struct fd_ringbuffer *ring, struct fd_bo *bo)
{
	struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
	uint32_t idx;

	idx = APPEND(&msm_ring->submit, bos);
	idx = APPEND(msm_ring, bos);

	msm_ring->submit.bos[idx].flags = 0;
	msm_ring->submit.bos[idx].handle = bo->handle;
	msm_ring->submit.bos[idx].presumed = to_msm_bo(bo)->presumed;

	msm_ring->bos[idx] = fd_bo_ref(bo);

	return idx;
}

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/* add (if needed) bo, return idx: */
static uint32_t bo2idx(struct fd_ringbuffer *ring, struct fd_bo *bo, uint32_t flags)
{
	struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
	struct msm_bo *msm_bo = to_msm_bo(bo);
	uint32_t idx;
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	pthread_mutex_lock(&idx_lock);
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	if (msm_bo->current_ring_seqno == msm_ring->seqno) {
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		idx = msm_bo->idx;
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	} else {
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		void *val;

		if (!msm_ring->bo_table)
			msm_ring->bo_table = drmHashCreate();

		if (!drmHashLookup(msm_ring->bo_table, bo->handle, &val)) {
			/* found */
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			idx = (uint32_t)(uintptr_t)val;
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		} else {
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			idx = append_bo(ring, bo);
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			val = (void *)(uintptr_t)idx;
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			drmHashInsert(msm_ring->bo_table, bo->handle, val);
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		}
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		msm_bo->current_ring_seqno = msm_ring->seqno;
		msm_bo->idx = idx;
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	}
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	pthread_mutex_unlock(&idx_lock);
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	if (flags & FD_RELOC_READ)
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		msm_ring->submit.bos[idx].flags |= MSM_SUBMIT_BO_READ;
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	if (flags & FD_RELOC_WRITE)
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		msm_ring->submit.bos[idx].flags |= MSM_SUBMIT_BO_WRITE;
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	return idx;
}

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static int check_cmd_bo(struct fd_ringbuffer *ring,
		struct drm_msm_gem_submit_cmd *cmd, struct fd_bo *bo)
{
	struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
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	return msm_ring->submit.bos[cmd->submit_idx].handle == bo->handle;
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}

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/* Ensure that submit has corresponding entry in cmds table for the
 * target cmdstream buffer:
 */
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static void get_cmd(struct fd_ringbuffer *ring, struct msm_cmd *target_cmd,
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		uint32_t submit_offset, uint32_t size, uint32_t type)
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{
	struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
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	struct drm_msm_gem_submit_cmd *cmd;
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	uint32_t i;

	/* figure out if we already have a cmd buf: */
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	for (i = 0; i < msm_ring->submit.nr_cmds; i++) {
		cmd = &msm_ring->submit.cmds[i];
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		if ((cmd->submit_offset == submit_offset) &&
				(cmd->size == size) &&
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				(cmd->type == type) &&
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				check_cmd_bo(ring, cmd, target_cmd->ring_bo))
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			return;
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	}

	/* create cmd buf if not: */
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	i = APPEND(&msm_ring->submit, cmds);
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	APPEND(msm_ring, cmds);
	msm_ring->cmds[i] = target_cmd;
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	cmd = &msm_ring->submit.cmds[i];
	cmd->type = type;
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	cmd->submit_idx = bo2idx(ring, target_cmd->ring_bo, FD_RELOC_READ);
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	cmd->submit_offset = submit_offset;
	cmd->size = size;
	cmd->pad = 0;
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	target_cmd->size = size;
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}

static void * msm_ringbuffer_hostptr(struct fd_ringbuffer *ring)
{
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	return fd_bo_map(current_cmd(ring)->ring_bo);
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}

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static uint32_t find_next_reloc_idx(struct msm_cmd *msm_cmd,
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		uint32_t start, uint32_t offset)
{
	uint32_t i;

	/* a binary search would be more clever.. */
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	for (i = start; i < msm_cmd->nr_relocs; i++) {
		struct drm_msm_gem_submit_reloc *reloc = &msm_cmd->relocs[i];
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		if (reloc->submit_offset >= offset)
			return i;
	}

	return i;
}

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static void delete_cmds(struct msm_ringbuffer *msm_ring)
{
	struct msm_cmd *cmd, *tmp;

	LIST_FOR_EACH_ENTRY_SAFE(cmd, tmp, &msm_ring->cmd_list, list) {
		ring_cmd_del(cmd);
	}
}

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static void flush_reset(struct fd_ringbuffer *ring)
{
	struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
	unsigned i;

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	for (i = 0; i < msm_ring->nr_bos; i++) {
		struct msm_bo *msm_bo = to_msm_bo(msm_ring->bos[i]);
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		msm_bo->current_ring_seqno = 0;
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		fd_bo_del(&msm_bo->base);
	}

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	/* for each of the cmd buffers, clear their reloc's: */
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	for (i = 0; i < msm_ring->submit.nr_cmds; i++) {
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		struct msm_cmd *target_cmd = msm_ring->cmds[i];
		target_cmd->nr_relocs = 0;
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	}

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	msm_ring->submit.nr_cmds = 0;
	msm_ring->submit.nr_bos = 0;
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	msm_ring->nr_cmds = 0;
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	msm_ring->nr_bos = 0;
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	if (msm_ring->bo_table) {
		drmHashDestroy(msm_ring->bo_table);
		msm_ring->bo_table = NULL;
	}

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	if (msm_ring->is_growable) {
		delete_cmds(msm_ring);
	} else {
		/* in old mode, just reset the # of relocs: */
		current_cmd(ring)->nr_relocs = 0;
	}
}

static void finalize_current_cmd(struct fd_ringbuffer *ring, uint32_t *last_start)
{
	uint32_t submit_offset, size, type;
	struct fd_ringbuffer *parent;

	if (ring->parent) {
		parent = ring->parent;
		type = MSM_SUBMIT_CMD_IB_TARGET_BUF;
	} else {
		parent = ring;
		type = MSM_SUBMIT_CMD_BUF;
	}

	submit_offset = offset_bytes(last_start, ring->start);
	size = offset_bytes(ring->cur, last_start);

	get_cmd(parent, current_cmd(ring), submit_offset, size, type);
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}

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static void dump_submit(struct msm_ringbuffer *msm_ring)
{
	uint32_t i, j;

	for (i = 0; i < msm_ring->submit.nr_bos; i++) {
		struct drm_msm_gem_submit_bo *bo = &msm_ring->submit.bos[i];
		ERROR_MSG("  bos[%d]: handle=%u, flags=%x", i, bo->handle, bo->flags);
	}
	for (i = 0; i < msm_ring->submit.nr_cmds; i++) {
		struct drm_msm_gem_submit_cmd *cmd = &msm_ring->submit.cmds[i];
		struct drm_msm_gem_submit_reloc *relocs = U642VOID(cmd->relocs);
		ERROR_MSG("  cmd[%d]: type=%u, submit_idx=%u, submit_offset=%u, size=%u",
				i, cmd->type, cmd->submit_idx, cmd->submit_offset, cmd->size);
		for (j = 0; j < cmd->nr_relocs; j++) {
			struct drm_msm_gem_submit_reloc *r = &relocs[j];
			ERROR_MSG("    reloc[%d]: submit_offset=%u, or=%08x, shift=%d, reloc_idx=%u"
					", reloc_offset=%"PRIu64, j, r->submit_offset, r->or, r->shift,
					r->reloc_idx, r->reloc_offset);
		}
	}
}

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static int msm_ringbuffer_flush(struct fd_ringbuffer *ring, uint32_t *last_start,
		int in_fence_fd, int *out_fence_fd)
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{
	struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
	struct drm_msm_gem_submit req = {
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			.flags = to_msm_pipe(ring->pipe)->pipe,
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	};
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	uint32_t i;
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	int ret;
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	if (in_fence_fd != -1) {
		req.flags |= MSM_SUBMIT_FENCE_FD_IN | MSM_SUBMIT_NO_IMPLICIT;
		req.fence_fd = in_fence_fd;
	}

	if (out_fence_fd) {
		req.flags |= MSM_SUBMIT_FENCE_FD_OUT;
	}

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	finalize_current_cmd(ring, last_start);
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	/* needs to be after get_cmd() as that could create bos/cmds table: */
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	req.bos = VOID2U64(msm_ring->submit.bos),
	req.nr_bos = msm_ring->submit.nr_bos;
	req.cmds = VOID2U64(msm_ring->submit.cmds),
	req.nr_cmds = msm_ring->submit.nr_cmds;
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	/* for each of the cmd's fix up their reloc's: */
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	for (i = 0; i < msm_ring->submit.nr_cmds; i++) {
		struct drm_msm_gem_submit_cmd *cmd = &msm_ring->submit.cmds[i];
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		struct msm_cmd *msm_cmd = msm_ring->cmds[i];
		uint32_t a = find_next_reloc_idx(msm_cmd, 0, cmd->submit_offset);
		uint32_t b = find_next_reloc_idx(msm_cmd, a, cmd->submit_offset + cmd->size);
		cmd->relocs = VOID2U64(&msm_cmd->relocs[a]);
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		cmd->nr_relocs = (b > a) ? b - a : 0;
	}

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	DEBUG_MSG("nr_cmds=%u, nr_bos=%u", req.nr_cmds, req.nr_bos);
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	ret = drmCommandWriteRead(ring->pipe->dev->fd, DRM_MSM_GEM_SUBMIT,
			&req, sizeof(req));
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	if (ret) {
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		ERROR_MSG("submit failed: %d (%s)", ret, strerror(errno));
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		dump_submit(msm_ring);
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	} else if (!ret) {
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		/* update timestamp on all rings associated with submit: */
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		for (i = 0; i < msm_ring->submit.nr_cmds; i++) {
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			struct msm_cmd *msm_cmd = msm_ring->cmds[i];
			msm_cmd->ring->last_timestamp = req.fence;
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		}
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		if (out_fence_fd) {
			*out_fence_fd = req.fence_fd;
		}
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	}
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	flush_reset(ring);
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	return ret;
}

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static void msm_ringbuffer_grow(struct fd_ringbuffer *ring, uint32_t size)
{
	assert(to_msm_ringbuffer(ring)->is_growable);
	finalize_current_cmd(ring, ring->last_start);
	ring_cmd_new(ring, size);
}

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static void msm_ringbuffer_reset(struct fd_ringbuffer *ring)
{
	flush_reset(ring);
}

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static void msm_ringbuffer_emit_reloc(struct fd_ringbuffer *ring,
		const struct fd_reloc *r)
{
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	struct fd_ringbuffer *parent = ring->parent ? ring->parent : ring;
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	struct msm_bo *msm_bo = to_msm_bo(r->bo);
	struct drm_msm_gem_submit_reloc *reloc;
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	struct msm_cmd *cmd = current_cmd(ring);
	uint32_t idx = APPEND(cmd, relocs);
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	uint32_t addr;

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	reloc = &cmd->relocs[idx];
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	reloc->reloc_idx = bo2idx(parent, r->bo, r->flags);
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	reloc->reloc_offset = r->offset;
	reloc->or = r->or;
	reloc->shift = r->shift;
	reloc->submit_offset = offset_bytes(ring->cur, ring->start);

	addr = msm_bo->presumed;
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	if (reloc->shift < 0)
		addr >>= -reloc->shift;
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	else
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		addr <<= reloc->shift;
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	(*ring->cur++) = addr | r->or;
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	if (ring->pipe->gpu_id >= 500) {
		struct drm_msm_gem_submit_reloc *reloc_hi;

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		/* NOTE: grab reloc_idx *before* APPEND() since that could
		 * realloc() meaning that 'reloc' ptr is no longer valid:
		 */
		uint32_t reloc_idx = reloc->reloc_idx;

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		idx = APPEND(cmd, relocs);

		reloc_hi = &cmd->relocs[idx];

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		reloc_hi->reloc_idx = reloc_idx;
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		reloc_hi->reloc_offset = r->offset;
		reloc_hi->or = r->orhi;
		reloc_hi->shift = r->shift - 32;
		reloc_hi->submit_offset = offset_bytes(ring->cur, ring->start);

		addr = msm_bo->presumed >> 32;
		if (reloc_hi->shift < 0)
			addr >>= -reloc_hi->shift;
		else
			addr <<= reloc_hi->shift;
		(*ring->cur++) = addr | r->orhi;
	}
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}

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static uint32_t msm_ringbuffer_emit_reloc_ring(struct fd_ringbuffer *ring,
		struct fd_ringbuffer *target, uint32_t cmd_idx,
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		uint32_t submit_offset, uint32_t size)
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{
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	struct msm_cmd *cmd = NULL;
	uint32_t idx = 0;

	LIST_FOR_EACH_ENTRY(cmd, &to_msm_ringbuffer(target)->cmd_list, list) {
		if (idx == cmd_idx)
			break;
		idx++;
	}
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	assert(cmd && (idx == cmd_idx));

	if (idx < (to_msm_ringbuffer(target)->cmd_count - 1)) {
		/* All but the last cmd buffer is fully "baked" (ie. already has
		 * done get_cmd() to add it to the cmds table).  But in this case,
		 * the size we get is invalid (since it is calculated from the
		 * last cmd buffer):
		 */
		size = cmd->size;
	} else {
		get_cmd(ring, cmd, submit_offset, size, MSM_SUBMIT_CMD_IB_TARGET_BUF);
	}
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	msm_ringbuffer_emit_reloc(ring, &(struct fd_reloc){
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		.bo = cmd->ring_bo,
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		.flags = FD_RELOC_READ,
		.offset = submit_offset,
	});
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	return size;
}

static uint32_t msm_ringbuffer_cmd_count(struct fd_ringbuffer *ring)
{
	return to_msm_ringbuffer(ring)->cmd_count;
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}

static void msm_ringbuffer_destroy(struct fd_ringbuffer *ring)
{
	struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
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	flush_reset(ring);
	delete_cmds(msm_ring);

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	free(msm_ring->submit.cmds);
	free(msm_ring->submit.bos);
	free(msm_ring->bos);
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	free(msm_ring->cmds);
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	free(msm_ring);
}

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static const struct fd_ringbuffer_funcs funcs = {
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		.hostptr = msm_ringbuffer_hostptr,
		.flush = msm_ringbuffer_flush,
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		.grow = msm_ringbuffer_grow,
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		.reset = msm_ringbuffer_reset,
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		.emit_reloc = msm_ringbuffer_emit_reloc,
		.emit_reloc_ring = msm_ringbuffer_emit_reloc_ring,
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		.cmd_count = msm_ringbuffer_cmd_count,
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		.destroy = msm_ringbuffer_destroy,
};

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drm_private struct fd_ringbuffer * msm_ringbuffer_new(struct fd_pipe *pipe,
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		uint32_t size)
{
	struct msm_ringbuffer *msm_ring;
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	struct fd_ringbuffer *ring;
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	msm_ring = calloc(1, sizeof(*msm_ring));
	if (!msm_ring) {
		ERROR_MSG("allocation failed");
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		return NULL;
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	}

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	if (size == 0) {
		assert(pipe->dev->version >= FD_VERSION_UNLIMITED_CMDS);
		size = INIT_SIZE;
		msm_ring->is_growable = TRUE;
	}

	list_inithead(&msm_ring->cmd_list);
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	msm_ring->seqno = ++to_msm_device(pipe->dev)->ring_cnt;
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	ring = &msm_ring->base;
	ring->funcs = &funcs;
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	ring->size = size;
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	ring->pipe = pipe;   /* needed in ring_cmd_new() */
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	ring_cmd_new(ring, size);
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	return ring;
}