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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>
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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 |
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// 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" | ||
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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, | ||
}; | ||
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static const struct fb_var_screeninfo mdpy_fb_var = { | ||
.height = -1, | ||
.width = -1, | ||
.activate = FB_ACTIVATE_NOW, | ||
.vmode = FB_VMODE_NONINTERLACED, | ||
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.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, | ||
}; | ||
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#define PSEUDO_PALETTE_SIZE 16 | ||
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struct mdpy_fb_par { | ||
u32 palette[PSEUDO_PALETTE_SIZE]; | ||
}; | ||
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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; | ||
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if (regno >= PSEUDO_PALETTE_SIZE) | ||
return -EINVAL; | ||
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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; | ||
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return 0; | ||
} | ||
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static void mdpy_fb_destroy(struct fb_info *info) | ||
{ | ||
if (info->screen_base) | ||
iounmap(info->screen_base); | ||
} | ||
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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, | ||
}; | ||
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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; | ||
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ret = pci_enable_device(pdev); | ||
if (ret < 0) | ||
return ret; | ||
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ret = pci_request_regions(pdev, "mdpy-fb"); | ||
if (ret < 0) | ||
return ret; | ||
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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); | ||
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info = framebuffer_alloc(sizeof(struct mdpy_fb_par), &pdev->dev); | ||
if (!info) | ||
goto err_release_regions; | ||
pci_set_drvdata(pdev, info); | ||
par = info->par; | ||
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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; | ||
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info->var = mdpy_fb_var; | ||
info->var.xres = width; | ||
info->var.yres = height; | ||
info->var.xres_virtual = width; | ||
info->var.yres_virtual = height; | ||
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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; | ||
} | ||
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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; | ||
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info->fbops = &mdpy_fb_ops; | ||
info->flags = FBINFO_DEFAULT; | ||
info->pseudo_palette = par->palette; | ||
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ret = register_framebuffer(info); | ||
if (ret < 0) { | ||
pci_err(pdev, "mdpy-fb device register failed: %d\n", ret); | ||
goto err_unmap; | ||
} | ||
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pci_info(pdev, "fb%d registered\n", info->node); | ||
return 0; | ||
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err_unmap: | ||
iounmap(info->screen_base); | ||
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err_release_fb: | ||
framebuffer_release(info); | ||
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err_release_regions: | ||
pci_release_regions(pdev); | ||
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return ret; | ||
} | ||
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static void mdpy_fb_remove(struct pci_dev *pdev) | ||
{ | ||
struct fb_info *info = pci_get_drvdata(pdev); | ||
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unregister_framebuffer(info); | ||
framebuffer_release(info); | ||
} | ||
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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 */ | ||
} | ||
}; | ||
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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, | ||
}; | ||
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static int __init mdpy_fb_init(void) | ||
{ | ||
int ret; | ||
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ret = pci_register_driver(&mdpy_fb_pci_driver); | ||
if (ret) | ||
return ret; | ||
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return 0; | ||
} | ||
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module_init(mdpy_fb_init); | ||
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MODULE_DEVICE_TABLE(pci, mdpy_fb_pci_table); | ||
MODULE_LICENSE("GPL v2"); |