sample: vfio mdev display - guest driver
Guest fbdev driver for CONFIG_SAMPLE_VFIO_MDEV_MDPY. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Gerd Hoffmann
Alex Williamson
Родитель
d61fc96f47
Коммит
cacade1946
|
|
@ -123,6 +123,15 @@ config SAMPLE_VFIO_MDEV_MDPY
|
|||
mediated device. It is a simple framebuffer and supports
|
||||
the region display interface (VFIO_GFX_PLANE_TYPE_REGION).
|
||||
|
||||
config SAMPLE_VFIO_MDEV_MDPY_FB
|
||||
tristate "Build VFIO mdpy example guest fbdev driver -- loadable module only"
|
||||
depends on FB && m
|
||||
select FB_CFB_FILLRECT
|
||||
select FB_CFB_COPYAREA
|
||||
select FB_CFB_IMAGEBLIT
|
||||
help
|
||||
Guest fbdev driver for the virtual display sample driver.
|
||||
|
||||
config SAMPLE_STATX
|
||||
bool "Build example extended-stat using code"
|
||||
depends on BROKEN
|
||||
|
|
|
|||
|
|
@ -1,2 +1,3 @@
|
|||
obj-$(CONFIG_SAMPLE_VFIO_MDEV_MTTY) += mtty.o
|
||||
obj-$(CONFIG_SAMPLE_VFIO_MDEV_MDPY) += mdpy.o
|
||||
obj-$(CONFIG_SAMPLE_VFIO_MDEV_MDPY_FB) += mdpy-fb.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,232 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
/*
|
||||
* Framebuffer driver for mdpy (mediated virtual pci display device).
|
||||
*
|
||||
* See mdpy-defs.h for device specs
|
||||
*
|
||||
* (c) Gerd Hoffmann <kraxel@redhat.com>
|
||||
*
|
||||
* Using some code snippets from simplefb and cirrusfb.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms and conditions of the GNU General Public License,
|
||||
* version 2, as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope it will be useful, but WITHOUT
|
||||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
||||
* more details.
|
||||
*/
|
||||
#include <linux/errno.h>
|
||||
#include <linux/fb.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/pci.h>
|
||||
#include <linux/module.h>
|
||||
#include <drm/drm_fourcc.h>
|
||||
#include "mdpy-defs.h"
|
||||
|
||||
static const struct fb_fix_screeninfo mdpy_fb_fix = {
|
||||
.id = "mdpy-fb",
|
||||
.type = FB_TYPE_PACKED_PIXELS,
|
||||
.visual = FB_VISUAL_TRUECOLOR,
|
||||
.accel = FB_ACCEL_NONE,
|
||||
};
|
||||
|
||||
static const struct fb_var_screeninfo mdpy_fb_var = {
|
||||
.height = -1,
|
||||
.width = -1,
|
||||
.activate = FB_ACTIVATE_NOW,
|
||||
.vmode = FB_VMODE_NONINTERLACED,
|
||||
|
||||
.bits_per_pixel = 32,
|
||||
.transp.offset = 24,
|
||||
.red.offset = 16,
|
||||
.green.offset = 8,
|
||||
.blue.offset = 0,
|
||||
.transp.length = 8,
|
||||
.red.length = 8,
|
||||
.green.length = 8,
|
||||
.blue.length = 8,
|
||||
};
|
||||
|
||||
#define PSEUDO_PALETTE_SIZE 16
|
||||
|
||||
struct mdpy_fb_par {
|
||||
u32 palette[PSEUDO_PALETTE_SIZE];
|
||||
};
|
||||
|
||||
static int mdpy_fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
|
||||
u_int transp, struct fb_info *info)
|
||||
{
|
||||
u32 *pal = info->pseudo_palette;
|
||||
u32 cr = red >> (16 - info->var.red.length);
|
||||
u32 cg = green >> (16 - info->var.green.length);
|
||||
u32 cb = blue >> (16 - info->var.blue.length);
|
||||
u32 value, mask;
|
||||
|
||||
if (regno >= PSEUDO_PALETTE_SIZE)
|
||||
return -EINVAL;
|
||||
|
||||
value = (cr << info->var.red.offset) |
|
||||
(cg << info->var.green.offset) |
|
||||
(cb << info->var.blue.offset);
|
||||
if (info->var.transp.length > 0) {
|
||||
mask = (1 << info->var.transp.length) - 1;
|
||||
mask <<= info->var.transp.offset;
|
||||
value |= mask;
|
||||
}
|
||||
pal[regno] = value;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void mdpy_fb_destroy(struct fb_info *info)
|
||||
{
|
||||
if (info->screen_base)
|
||||
iounmap(info->screen_base);
|
||||
}
|
||||
|
||||
static struct fb_ops mdpy_fb_ops = {
|
||||
.owner = THIS_MODULE,
|
||||
.fb_destroy = mdpy_fb_destroy,
|
||||
.fb_setcolreg = mdpy_fb_setcolreg,
|
||||
.fb_fillrect = cfb_fillrect,
|
||||
.fb_copyarea = cfb_copyarea,
|
||||
.fb_imageblit = cfb_imageblit,
|
||||
};
|
||||
|
||||
static int mdpy_fb_probe(struct pci_dev *pdev,
|
||||
const struct pci_device_id *ent)
|
||||
{
|
||||
struct fb_info *info;
|
||||
struct mdpy_fb_par *par;
|
||||
u32 format, width, height;
|
||||
int ret;
|
||||
|
||||
ret = pci_enable_device(pdev);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = pci_request_regions(pdev, "mdpy-fb");
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
pci_read_config_dword(pdev, MDPY_FORMAT_OFFSET, &format);
|
||||
pci_read_config_dword(pdev, MDPY_WIDTH_OFFSET, &width);
|
||||
pci_read_config_dword(pdev, MDPY_HEIGHT_OFFSET, &height);
|
||||
if (format != DRM_FORMAT_XRGB8888) {
|
||||
pci_err(pdev, "format mismatch (0x%x != 0x%x)\n",
|
||||
format, DRM_FORMAT_XRGB8888);
|
||||
return -EINVAL;
|
||||
}
|
||||
if (width < 100 || width > 10000) {
|
||||
pci_err(pdev, "width (%d) out of range\n", width);
|
||||
return -EINVAL;
|
||||
}
|
||||
if (height < 100 || height > 10000) {
|
||||
pci_err(pdev, "height (%d) out of range\n", height);
|
||||
return -EINVAL;
|
||||
}
|
||||
pci_info(pdev, "mdpy found: %dx%d framebuffer\n",
|
||||
width, height);
|
||||
|
||||
info = framebuffer_alloc(sizeof(struct mdpy_fb_par), &pdev->dev);
|
||||
if (!info)
|
||||
goto err_release_regions;
|
||||
pci_set_drvdata(pdev, info);
|
||||
par = info->par;
|
||||
|
||||
info->fix = mdpy_fb_fix;
|
||||
info->fix.smem_start = pci_resource_start(pdev, 0);
|
||||
info->fix.smem_len = pci_resource_len(pdev, 0);
|
||||
info->fix.line_length = width * 4;
|
||||
|
||||
info->var = mdpy_fb_var;
|
||||
info->var.xres = width;
|
||||
info->var.yres = height;
|
||||
info->var.xres_virtual = width;
|
||||
info->var.yres_virtual = height;
|
||||
|
||||
info->screen_size = info->fix.smem_len;
|
||||
info->screen_base = ioremap(info->fix.smem_start,
|
||||
info->screen_size);
|
||||
if (!info->screen_base) {
|
||||
pci_err(pdev, "ioremap(pcibar) failed\n");
|
||||
ret = -EIO;
|
||||
goto err_release_fb;
|
||||
}
|
||||
|
||||
info->apertures = alloc_apertures(1);
|
||||
if (!info->apertures) {
|
||||
ret = -ENOMEM;
|
||||
goto err_unmap;
|
||||
}
|
||||
info->apertures->ranges[0].base = info->fix.smem_start;
|
||||
info->apertures->ranges[0].size = info->fix.smem_len;
|
||||
|
||||
info->fbops = &mdpy_fb_ops;
|
||||
info->flags = FBINFO_DEFAULT;
|
||||
info->pseudo_palette = par->palette;
|
||||
|
||||
ret = register_framebuffer(info);
|
||||
if (ret < 0) {
|
||||
pci_err(pdev, "mdpy-fb device register failed: %d\n", ret);
|
||||
goto err_unmap;
|
||||
}
|
||||
|
||||
pci_info(pdev, "fb%d registered\n", info->node);
|
||||
return 0;
|
||||
|
||||
err_unmap:
|
||||
iounmap(info->screen_base);
|
||||
|
||||
err_release_fb:
|
||||
framebuffer_release(info);
|
||||
|
||||
err_release_regions:
|
||||
pci_release_regions(pdev);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void mdpy_fb_remove(struct pci_dev *pdev)
|
||||
{
|
||||
struct fb_info *info = pci_get_drvdata(pdev);
|
||||
|
||||
unregister_framebuffer(info);
|
||||
framebuffer_release(info);
|
||||
}
|
||||
|
||||
static struct pci_device_id mdpy_fb_pci_table[] = {
|
||||
{
|
||||
.vendor = MDPY_PCI_VENDOR_ID,
|
||||
.device = MDPY_PCI_DEVICE_ID,
|
||||
.subvendor = MDPY_PCI_SUBVENDOR_ID,
|
||||
.subdevice = MDPY_PCI_SUBDEVICE_ID,
|
||||
}, {
|
||||
/* end of list */
|
||||
}
|
||||
};
|
||||
|
||||
static struct pci_driver mdpy_fb_pci_driver = {
|
||||
.name = "mdpy-fb",
|
||||
.id_table = mdpy_fb_pci_table,
|
||||
.probe = mdpy_fb_probe,
|
||||
.remove = mdpy_fb_remove,
|
||||
};
|
||||
|
||||
static int __init mdpy_fb_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = pci_register_driver(&mdpy_fb_pci_driver);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
module_init(mdpy_fb_init);
|
||||
|
||||
MODULE_DEVICE_TABLE(pci, mdpy_fb_pci_table);
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Загрузка…
Ссылка в новой задаче