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// SPDX-License-Identifier: MIT
/* Copyright (C) 2006-2017 Oracle Corporation */
#include <linux/vbox_err.h>
#include "vbox_drv.h"
#include "vboxvideo_guest.h"
#include "vboxvideo_vbe.h"
#include "hgsmi_channels.h"
#include "hgsmi_ch_setup.h"
/**
* hgsmi_report_flags_location - Inform the host of the location of
* the host flags in VRAM via an HGSMI cmd.
* Return: 0 or negative errno value.
* @ctx: The context of the guest heap to use.
* @location: The offset chosen for the flags within guest VRAM.
*/
int hgsmi_report_flags_location(struct gen_pool *ctx, u32 location)
{
struct hgsmi_buffer_location *p;
p = hgsmi_buffer_alloc(ctx, sizeof(*p), HGSMI_CH_HGSMI,
HGSMI_CC_HOST_FLAGS_LOCATION);
if (!p)
return -ENOMEM;
p->buf_location = location;
p->buf_len = sizeof(struct hgsmi_host_flags);
hgsmi_buffer_submit(ctx, p);
hgsmi_buffer_free(ctx, p);
return 0;
}
/**
* hgsmi_send_caps_info - Notify the host of HGSMI-related guest capabilities
* via an HGSMI command.
* Return: 0 or negative errno value.
* @ctx: The context of the guest heap to use.
* @caps: The capabilities to report, see vbva_caps.
*/
int hgsmi_send_caps_info(struct gen_pool *ctx, u32 caps)
{
struct vbva_caps *p;
p = hgsmi_buffer_alloc(ctx, sizeof(*p), HGSMI_CH_VBVA, VBVA_INFO_CAPS);
if (!p)
return -ENOMEM;
p->rc = VERR_NOT_IMPLEMENTED;
p->caps = caps;
hgsmi_buffer_submit(ctx, p);
WARN_ON_ONCE(p->rc < 0);
hgsmi_buffer_free(ctx, p);
return 0;
}
int hgsmi_test_query_conf(struct gen_pool *ctx)
{
u32 value = 0;
int ret;
ret = hgsmi_query_conf(ctx, U32_MAX, &value);
if (ret)
return ret;
return value == U32_MAX ? 0 : -EIO;
}
/**
* hgsmi_query_conf - Query the host for an HGSMI configuration
* parameter via an HGSMI command.
* Return: 0 or negative errno value.
* @ctx: The context containing the heap used.
* @index: The index of the parameter to query.
* @value_ret: Where to store the value of the parameter on success.
*/
int hgsmi_query_conf(struct gen_pool *ctx, u32 index, u32 *value_ret)
{
struct vbva_conf32 *p;
p = hgsmi_buffer_alloc(ctx, sizeof(*p), HGSMI_CH_VBVA,
VBVA_QUERY_CONF32);
if (!p)
return -ENOMEM;
p->index = index;
p->value = U32_MAX;
hgsmi_buffer_submit(ctx, p);
*value_ret = p->value;
hgsmi_buffer_free(ctx, p);
return 0;
}
/**
* hgsmi_update_pointer_shape - Pass the host a new mouse pointer shape
* via an HGSMI command.
* Return: 0 or negative errno value.
* @ctx: The context containing the heap to be used.
* @flags: Cursor flags.
* @hot_x: Horizontal position of the hot spot.
* @hot_y: Vertical position of the hot spot.
* @width: Width in pixels of the cursor.
* @height: Height in pixels of the cursor.
* @pixels: Pixel data, @see VMMDevReqMousePointer for the format.
* @len: Size in bytes of the pixel data.
*/
int hgsmi_update_pointer_shape(struct gen_pool *ctx, u32 flags,
u32 hot_x, u32 hot_y, u32 width, u32 height,
u8 *pixels, u32 len)
{
struct vbva_mouse_pointer_shape *p;
u32 pixel_len = 0;
int rc;
if (flags & VBOX_MOUSE_POINTER_SHAPE) {
/*
* Size of the pointer data:
* sizeof (AND mask) + sizeof (XOR_MASK)
*/
pixel_len = ((((width + 7) / 8) * height + 3) & ~3) +
width * 4 * height;
if (pixel_len > len)
return -EINVAL;
/*
* If shape is supplied, then always create the pointer visible.
* See comments in 'vboxUpdatePointerShape'
*/
flags |= VBOX_MOUSE_POINTER_VISIBLE;
}
/*
* The 4 extra bytes come from switching struct vbva_mouse_pointer_shape
* from having a 4 bytes fixed array at the end to using a proper VLA
* at the end. These 4 extra bytes were not subtracted from sizeof(*p)
* before the switch to the VLA, so this way the behavior is unchanged.
* Chances are these 4 extra bytes are not necessary but they are kept
* to avoid regressions.
*/
p = hgsmi_buffer_alloc(ctx, sizeof(*p) + pixel_len + 4, HGSMI_CH_VBVA,
VBVA_MOUSE_POINTER_SHAPE);
if (!p)
return -ENOMEM;
p->result = VINF_SUCCESS;
p->flags = flags;
p->hot_X = hot_x;
p->hot_y = hot_y;
p->width = width;
p->height = height;
if (pixel_len)
memcpy(p->data, pixels, pixel_len);
hgsmi_buffer_submit(ctx, p);
switch (p->result) {
case VINF_SUCCESS:
rc = 0;
break;
case VERR_NO_MEMORY:
rc = -ENOMEM;
break;
case VERR_NOT_SUPPORTED:
rc = -EBUSY;
break;
default:
rc = -EINVAL;
}
hgsmi_buffer_free(ctx, p);
return rc;
}
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