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path: root/drivers/staging/vboxvideo/vbva_base.c
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Diffstat (limited to 'drivers/staging/vboxvideo/vbva_base.c')
-rw-r--r--drivers/staging/vboxvideo/vbva_base.c214
1 files changed, 0 insertions, 214 deletions
diff --git a/drivers/staging/vboxvideo/vbva_base.c b/drivers/staging/vboxvideo/vbva_base.c
deleted file mode 100644
index 36bc9824ec3f..000000000000
--- a/drivers/staging/vboxvideo/vbva_base.c
+++ /dev/null
@@ -1,214 +0,0 @@
-// SPDX-License-Identifier: MIT
-/* Copyright (C) 2006-2017 Oracle Corporation */
-
-#include <linux/vbox_err.h>
-#include "vbox_drv.h"
-#include "vboxvideo_guest.h"
-#include "hgsmi_channels.h"
-
-/*
- * There is a hardware ring buffer in the graphics device video RAM, formerly
- * in the VBox VMMDev PCI memory space.
- * All graphics commands go there serialized by vbva_buffer_begin_update.
- * and vbva_buffer_end_update.
- *
- * free_offset is writing position. data_offset is reading position.
- * free_offset == data_offset means buffer is empty.
- * There must be always gap between data_offset and free_offset when data
- * are in the buffer.
- * Guest only changes free_offset, host changes data_offset.
- */
-
-static u32 vbva_buffer_available(const struct vbva_buffer *vbva)
-{
- s32 diff = vbva->data_offset - vbva->free_offset;
-
- return diff > 0 ? diff : vbva->data_len + diff;
-}
-
-static void vbva_buffer_place_data_at(struct vbva_buf_ctx *vbva_ctx,
- const void *p, u32 len, u32 offset)
-{
- struct vbva_buffer *vbva = vbva_ctx->vbva;
- u32 bytes_till_boundary = vbva->data_len - offset;
- u8 *dst = &vbva->data[offset];
- s32 diff = len - bytes_till_boundary;
-
- if (diff <= 0) {
- /* Chunk will not cross buffer boundary. */
- memcpy(dst, p, len);
- } else {
- /* Chunk crosses buffer boundary. */
- memcpy(dst, p, bytes_till_boundary);
- memcpy(&vbva->data[0], (u8 *)p + bytes_till_boundary, diff);
- }
-}
-
-static void vbva_buffer_flush(struct gen_pool *ctx)
-{
- struct vbva_flush *p;
-
- p = hgsmi_buffer_alloc(ctx, sizeof(*p), HGSMI_CH_VBVA, VBVA_FLUSH);
- if (!p)
- return;
-
- p->reserved = 0;
-
- hgsmi_buffer_submit(ctx, p);
- hgsmi_buffer_free(ctx, p);
-}
-
-bool vbva_write(struct vbva_buf_ctx *vbva_ctx, struct gen_pool *ctx,
- const void *p, u32 len)
-{
- struct vbva_record *record;
- struct vbva_buffer *vbva;
- u32 available;
-
- vbva = vbva_ctx->vbva;
- record = vbva_ctx->record;
-
- if (!vbva || vbva_ctx->buffer_overflow ||
- !record || !(record->len_and_flags & VBVA_F_RECORD_PARTIAL))
- return false;
-
- available = vbva_buffer_available(vbva);
-
- while (len > 0) {
- u32 chunk = len;
-
- if (chunk >= available) {
- vbva_buffer_flush(ctx);
- available = vbva_buffer_available(vbva);
- }
-
- if (chunk >= available) {
- if (WARN_ON(available <= vbva->partial_write_tresh)) {
- vbva_ctx->buffer_overflow = true;
- return false;
- }
- chunk = available - vbva->partial_write_tresh;
- }
-
- vbva_buffer_place_data_at(vbva_ctx, p, chunk,
- vbva->free_offset);
-
- vbva->free_offset = (vbva->free_offset + chunk) %
- vbva->data_len;
- record->len_and_flags += chunk;
- available -= chunk;
- len -= chunk;
- p += chunk;
- }
-
- return true;
-}
-
-static bool vbva_inform_host(struct vbva_buf_ctx *vbva_ctx,
- struct gen_pool *ctx, s32 screen, bool enable)
-{
- struct vbva_enable_ex *p;
- bool ret;
-
- p = hgsmi_buffer_alloc(ctx, sizeof(*p), HGSMI_CH_VBVA, VBVA_ENABLE);
- if (!p)
- return false;
-
- p->base.flags = enable ? VBVA_F_ENABLE : VBVA_F_DISABLE;
- p->base.offset = vbva_ctx->buffer_offset;
- p->base.result = VERR_NOT_SUPPORTED;
- if (screen >= 0) {
- p->base.flags |= VBVA_F_EXTENDED | VBVA_F_ABSOFFSET;
- p->screen_id = screen;
- }
-
- hgsmi_buffer_submit(ctx, p);
-
- if (enable)
- ret = p->base.result >= 0;
- else
- ret = true;
-
- hgsmi_buffer_free(ctx, p);
-
- return ret;
-}
-
-bool vbva_enable(struct vbva_buf_ctx *vbva_ctx, struct gen_pool *ctx,
- struct vbva_buffer *vbva, s32 screen)
-{
- bool ret = false;
-
- memset(vbva, 0, sizeof(*vbva));
- vbva->partial_write_tresh = 256;
- vbva->data_len = vbva_ctx->buffer_length - sizeof(struct vbva_buffer);
- vbva_ctx->vbva = vbva;
-
- ret = vbva_inform_host(vbva_ctx, ctx, screen, true);
- if (!ret)
- vbva_disable(vbva_ctx, ctx, screen);
-
- return ret;
-}
-
-void vbva_disable(struct vbva_buf_ctx *vbva_ctx, struct gen_pool *ctx,
- s32 screen)
-{
- vbva_ctx->buffer_overflow = false;
- vbva_ctx->record = NULL;
- vbva_ctx->vbva = NULL;
-
- vbva_inform_host(vbva_ctx, ctx, screen, false);
-}
-
-bool vbva_buffer_begin_update(struct vbva_buf_ctx *vbva_ctx,
- struct gen_pool *ctx)
-{
- struct vbva_record *record;
- u32 next;
-
- if (!vbva_ctx->vbva ||
- !(vbva_ctx->vbva->host_flags.host_events & VBVA_F_MODE_ENABLED))
- return false;
-
- WARN_ON(vbva_ctx->buffer_overflow || vbva_ctx->record);
-
- next = (vbva_ctx->vbva->record_free_index + 1) % VBVA_MAX_RECORDS;
-
- /* Flush if all slots in the records queue are used */
- if (next == vbva_ctx->vbva->record_first_index)
- vbva_buffer_flush(ctx);
-
- /* If even after flush there is no place then fail the request */
- if (next == vbva_ctx->vbva->record_first_index)
- return false;
-
- record = &vbva_ctx->vbva->records[vbva_ctx->vbva->record_free_index];
- record->len_and_flags = VBVA_F_RECORD_PARTIAL;
- vbva_ctx->vbva->record_free_index = next;
- /* Remember which record we are using. */
- vbva_ctx->record = record;
-
- return true;
-}
-
-void vbva_buffer_end_update(struct vbva_buf_ctx *vbva_ctx)
-{
- struct vbva_record *record = vbva_ctx->record;
-
- WARN_ON(!vbva_ctx->vbva || !record ||
- !(record->len_and_flags & VBVA_F_RECORD_PARTIAL));
-
- /* Mark the record completed. */
- record->len_and_flags &= ~VBVA_F_RECORD_PARTIAL;
-
- vbva_ctx->buffer_overflow = false;
- vbva_ctx->record = NULL;
-}
-
-void vbva_setup_buffer_context(struct vbva_buf_ctx *vbva_ctx,
- u32 buffer_offset, u32 buffer_length)
-{
- vbva_ctx->buffer_offset = buffer_offset;
- vbva_ctx->buffer_length = buffer_length;
-}