sample: vfio mdev display - host device
Simple framebuffer display, demo-ing the vfio region display interface (VFIO_GFX_PLANE_TYPE_REGION). Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
parent
48d8476b41
commit
d61fc96f47
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@ -115,6 +115,14 @@ config SAMPLE_VFIO_MDEV_MTTY
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Build a virtual tty sample driver for use as a VFIO
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mediated device
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config SAMPLE_VFIO_MDEV_MDPY
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tristate "Build VFIO mdpy example mediated device sample code -- loadable modules only"
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depends on VFIO_MDEV_DEVICE && m
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help
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Build a virtual display sample driver for use as a VFIO
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mediated device. It is a simple framebuffer and supports
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the region display interface (VFIO_GFX_PLANE_TYPE_REGION).
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config SAMPLE_STATX
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bool "Build example extended-stat using code"
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depends on BROKEN
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@ -1 +1,2 @@
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obj-$(CONFIG_SAMPLE_VFIO_MDEV_MTTY) += mtty.o
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obj-$(CONFIG_SAMPLE_VFIO_MDEV_MDPY) += mdpy.o
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22
samples/vfio-mdev/mdpy-defs.h
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22
samples/vfio-mdev/mdpy-defs.h
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@ -0,0 +1,22 @@
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* Simple pci display device.
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*
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* Framebuffer memory is pci bar 0.
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* Configuration (read-only) is in pci config space.
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* Format field uses drm fourcc codes.
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* ATM only DRM_FORMAT_XRGB8888 is supported.
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*/
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/* pci ids */
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#define MDPY_PCI_VENDOR_ID 0x1b36 /* redhat */
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#define MDPY_PCI_DEVICE_ID 0x000f
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#define MDPY_PCI_SUBVENDOR_ID PCI_SUBVENDOR_ID_REDHAT_QUMRANET
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#define MDPY_PCI_SUBDEVICE_ID PCI_SUBDEVICE_ID_QEMU
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/* pci cfg space offsets for fb config (dword) */
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#define MDPY_VENDORCAP_OFFSET 0x40
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#define MDPY_VENDORCAP_SIZE 0x10
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#define MDPY_FORMAT_OFFSET (MDPY_VENDORCAP_OFFSET + 0x04)
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#define MDPY_WIDTH_OFFSET (MDPY_VENDORCAP_OFFSET + 0x08)
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#define MDPY_HEIGHT_OFFSET (MDPY_VENDORCAP_OFFSET + 0x0c)
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samples/vfio-mdev/mdpy.c
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807
samples/vfio-mdev/mdpy.c
Normal file
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@ -0,0 +1,807 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Mediated virtual PCI display host device driver
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*
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* See mdpy-defs.h for device specs
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*
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* (c) Gerd Hoffmann <kraxel@redhat.com>
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*
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* based on mtty driver which is:
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* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
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* Author: Neo Jia <cjia@nvidia.com>
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* Kirti Wankhede <kwankhede@nvidia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/cdev.h>
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#include <linux/vfio.h>
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#include <linux/iommu.h>
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#include <linux/sysfs.h>
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#include <linux/mdev.h>
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#include <linux/pci.h>
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#include <drm/drm_fourcc.h>
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#include "mdpy-defs.h"
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#define MDPY_NAME "mdpy"
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#define MDPY_CLASS_NAME "mdpy"
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#define MDPY_CONFIG_SPACE_SIZE 0xff
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#define MDPY_MEMORY_BAR_OFFSET PAGE_SIZE
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#define MDPY_DISPLAY_REGION 16
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#define STORE_LE16(addr, val) (*(u16 *)addr = val)
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#define STORE_LE32(addr, val) (*(u32 *)addr = val)
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MODULE_LICENSE("GPL v2");
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static int max_devices = 4;
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module_param_named(count, max_devices, int, 0444);
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MODULE_PARM_DESC(count, "number of " MDPY_NAME " devices");
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#define MDPY_TYPE_1 "vga"
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#define MDPY_TYPE_2 "xga"
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#define MDPY_TYPE_3 "hd"
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static const struct mdpy_type {
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const char *name;
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u32 format;
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u32 bytepp;
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u32 width;
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u32 height;
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} mdpy_types[] = {
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{
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.name = MDPY_CLASS_NAME "-" MDPY_TYPE_1,
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.format = DRM_FORMAT_XRGB8888,
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.bytepp = 4,
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.width = 640,
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.height = 480,
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}, {
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.name = MDPY_CLASS_NAME "-" MDPY_TYPE_2,
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.format = DRM_FORMAT_XRGB8888,
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.bytepp = 4,
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.width = 1024,
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.height = 768,
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}, {
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.name = MDPY_CLASS_NAME "-" MDPY_TYPE_3,
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.format = DRM_FORMAT_XRGB8888,
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.bytepp = 4,
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.width = 1920,
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.height = 1080,
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},
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};
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static dev_t mdpy_devt;
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static struct class *mdpy_class;
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static struct cdev mdpy_cdev;
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static struct device mdpy_dev;
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static u32 mdpy_count;
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/* State of each mdev device */
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struct mdev_state {
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u8 *vconfig;
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u32 bar_mask;
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struct mutex ops_lock;
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struct mdev_device *mdev;
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struct vfio_device_info dev_info;
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const struct mdpy_type *type;
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u32 memsize;
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void *memblk;
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};
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static const struct mdpy_type *mdpy_find_type(struct kobject *kobj)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(mdpy_types); i++)
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if (strcmp(mdpy_types[i].name, kobj->name) == 0)
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return mdpy_types + i;
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return NULL;
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}
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static void mdpy_create_config_space(struct mdev_state *mdev_state)
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{
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STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID],
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MDPY_PCI_VENDOR_ID);
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STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID],
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MDPY_PCI_DEVICE_ID);
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STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID],
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MDPY_PCI_SUBVENDOR_ID);
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STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID],
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MDPY_PCI_SUBDEVICE_ID);
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STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND],
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PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
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STORE_LE16((u16 *) &mdev_state->vconfig[PCI_STATUS],
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PCI_STATUS_CAP_LIST);
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STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE],
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PCI_CLASS_DISPLAY_OTHER);
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mdev_state->vconfig[PCI_CLASS_REVISION] = 0x01;
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STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0],
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PCI_BASE_ADDRESS_SPACE_MEMORY |
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PCI_BASE_ADDRESS_MEM_TYPE_32 |
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PCI_BASE_ADDRESS_MEM_PREFETCH);
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mdev_state->bar_mask = ~(mdev_state->memsize) + 1;
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/* vendor specific capability for the config registers */
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mdev_state->vconfig[PCI_CAPABILITY_LIST] = MDPY_VENDORCAP_OFFSET;
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mdev_state->vconfig[MDPY_VENDORCAP_OFFSET + 0] = 0x09; /* vendor cap */
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mdev_state->vconfig[MDPY_VENDORCAP_OFFSET + 1] = 0x00; /* next ptr */
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mdev_state->vconfig[MDPY_VENDORCAP_OFFSET + 2] = MDPY_VENDORCAP_SIZE;
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STORE_LE32((u32 *) &mdev_state->vconfig[MDPY_FORMAT_OFFSET],
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mdev_state->type->format);
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STORE_LE32((u32 *) &mdev_state->vconfig[MDPY_WIDTH_OFFSET],
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mdev_state->type->width);
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STORE_LE32((u32 *) &mdev_state->vconfig[MDPY_HEIGHT_OFFSET],
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mdev_state->type->height);
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}
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static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset,
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char *buf, u32 count)
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{
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struct device *dev = mdev_dev(mdev_state->mdev);
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u32 cfg_addr;
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switch (offset) {
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case PCI_BASE_ADDRESS_0:
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cfg_addr = *(u32 *)buf;
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if (cfg_addr == 0xffffffff) {
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cfg_addr = (cfg_addr & mdev_state->bar_mask);
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} else {
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cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK;
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if (cfg_addr)
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dev_info(dev, "BAR0 @ 0x%x\n", cfg_addr);
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}
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cfg_addr |= (mdev_state->vconfig[offset] &
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~PCI_BASE_ADDRESS_MEM_MASK);
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STORE_LE32(&mdev_state->vconfig[offset], cfg_addr);
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break;
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}
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}
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static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
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loff_t pos, bool is_write)
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{
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struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
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struct device *dev = mdev_dev(mdev);
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int ret = 0;
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mutex_lock(&mdev_state->ops_lock);
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if (pos < MDPY_CONFIG_SPACE_SIZE) {
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if (is_write)
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handle_pci_cfg_write(mdev_state, pos, buf, count);
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else
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memcpy(buf, (mdev_state->vconfig + pos), count);
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} else if ((pos >= MDPY_MEMORY_BAR_OFFSET) &&
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(pos + count <=
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MDPY_MEMORY_BAR_OFFSET + mdev_state->memsize)) {
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pos -= MDPY_MEMORY_BAR_OFFSET;
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if (is_write)
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memcpy(mdev_state->memblk, buf, count);
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else
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memcpy(buf, mdev_state->memblk, count);
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} else {
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dev_info(dev, "%s: %s @0x%llx (unhandled)\n",
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__func__, is_write ? "WR" : "RD", pos);
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ret = -1;
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goto accessfailed;
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}
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ret = count;
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accessfailed:
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mutex_unlock(&mdev_state->ops_lock);
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return ret;
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}
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static int mdpy_reset(struct mdev_device *mdev)
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{
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struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
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u32 stride, i;
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/* initialize with gray gradient */
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stride = mdev_state->type->width * mdev_state->type->bytepp;
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for (i = 0; i < mdev_state->type->height; i++)
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memset(mdev_state->memblk + i * stride,
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i * 255 / mdev_state->type->height,
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stride);
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return 0;
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}
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static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev)
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{
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const struct mdpy_type *type = mdpy_find_type(kobj);
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struct device *dev = mdev_dev(mdev);
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struct mdev_state *mdev_state;
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u32 fbsize;
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if (mdpy_count >= max_devices)
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return -ENOMEM;
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mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
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if (mdev_state == NULL)
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return -ENOMEM;
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mdev_state->vconfig = kzalloc(MDPY_CONFIG_SPACE_SIZE, GFP_KERNEL);
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if (mdev_state->vconfig == NULL) {
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kfree(mdev_state);
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return -ENOMEM;
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}
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if (!type)
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type = &mdpy_types[0];
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fbsize = roundup_pow_of_two(type->width * type->height * type->bytepp);
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mdev_state->memblk = vmalloc_user(fbsize);
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if (!mdev_state->memblk) {
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kfree(mdev_state->vconfig);
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kfree(mdev_state);
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return -ENOMEM;
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}
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dev_info(dev, "%s: %s (%dx%d)\n",
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__func__, kobj->name, type->width, type->height);
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mutex_init(&mdev_state->ops_lock);
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mdev_state->mdev = mdev;
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mdev_set_drvdata(mdev, mdev_state);
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mdev_state->type = type;
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mdev_state->memsize = fbsize;
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mdpy_create_config_space(mdev_state);
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mdpy_reset(mdev);
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mdpy_count++;
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return 0;
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}
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static int mdpy_remove(struct mdev_device *mdev)
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{
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struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
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struct device *dev = mdev_dev(mdev);
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dev_info(dev, "%s\n", __func__);
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mdev_set_drvdata(mdev, NULL);
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vfree(mdev_state->memblk);
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kfree(mdev_state->vconfig);
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kfree(mdev_state);
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mdpy_count--;
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return 0;
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}
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static ssize_t mdpy_read(struct mdev_device *mdev, char __user *buf,
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size_t count, loff_t *ppos)
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{
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unsigned int done = 0;
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int ret;
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while (count) {
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size_t filled;
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if (count >= 4 && !(*ppos % 4)) {
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u32 val;
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ret = mdev_access(mdev, (char *)&val, sizeof(val),
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*ppos, false);
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if (ret <= 0)
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goto read_err;
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if (copy_to_user(buf, &val, sizeof(val)))
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goto read_err;
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filled = 4;
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} else if (count >= 2 && !(*ppos % 2)) {
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u16 val;
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ret = mdev_access(mdev, (char *)&val, sizeof(val),
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*ppos, false);
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if (ret <= 0)
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goto read_err;
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if (copy_to_user(buf, &val, sizeof(val)))
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goto read_err;
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filled = 2;
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} else {
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u8 val;
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ret = mdev_access(mdev, (char *)&val, sizeof(val),
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*ppos, false);
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if (ret <= 0)
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goto read_err;
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if (copy_to_user(buf, &val, sizeof(val)))
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goto read_err;
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filled = 1;
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}
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count -= filled;
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done += filled;
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*ppos += filled;
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buf += filled;
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}
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return done;
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read_err:
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return -EFAULT;
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}
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static ssize_t mdpy_write(struct mdev_device *mdev, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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unsigned int done = 0;
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int ret;
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|
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while (count) {
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size_t filled;
|
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|
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if (count >= 4 && !(*ppos % 4)) {
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u32 val;
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if (copy_from_user(&val, buf, sizeof(val)))
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goto write_err;
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ret = mdev_access(mdev, (char *)&val, sizeof(val),
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*ppos, true);
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if (ret <= 0)
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goto write_err;
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filled = 4;
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} else if (count >= 2 && !(*ppos % 2)) {
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u16 val;
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if (copy_from_user(&val, buf, sizeof(val)))
|
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goto write_err;
|
||||
|
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ret = mdev_access(mdev, (char *)&val, sizeof(val),
|
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*ppos, true);
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if (ret <= 0)
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goto write_err;
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|
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filled = 2;
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} else {
|
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u8 val;
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if (copy_from_user(&val, buf, sizeof(val)))
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goto write_err;
|
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|
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ret = mdev_access(mdev, (char *)&val, sizeof(val),
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*ppos, true);
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if (ret <= 0)
|
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goto write_err;
|
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|
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filled = 1;
|
||||
}
|
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count -= filled;
|
||||
done += filled;
|
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*ppos += filled;
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buf += filled;
|
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}
|
||||
|
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return done;
|
||||
write_err:
|
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return -EFAULT;
|
||||
}
|
||||
|
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static int mdpy_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
|
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{
|
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struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
|
||||
|
||||
if (vma->vm_pgoff != MDPY_MEMORY_BAR_OFFSET >> PAGE_SHIFT)
|
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return -EINVAL;
|
||||
if (vma->vm_end < vma->vm_start)
|
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return -EINVAL;
|
||||
if (vma->vm_end - vma->vm_start > mdev_state->memsize)
|
||||
return -EINVAL;
|
||||
if ((vma->vm_flags & VM_SHARED) == 0)
|
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return -EINVAL;
|
||||
|
||||
return remap_vmalloc_range_partial(vma, vma->vm_start,
|
||||
mdev_state->memblk,
|
||||
vma->vm_end - vma->vm_start);
|
||||
}
|
||||
|
||||
static int mdpy_get_region_info(struct mdev_device *mdev,
|
||||
struct vfio_region_info *region_info,
|
||||
u16 *cap_type_id, void **cap_type)
|
||||
{
|
||||
struct mdev_state *mdev_state;
|
||||
|
||||
mdev_state = mdev_get_drvdata(mdev);
|
||||
if (!mdev_state)
|
||||
return -EINVAL;
|
||||
|
||||
if (region_info->index >= VFIO_PCI_NUM_REGIONS &&
|
||||
region_info->index != MDPY_DISPLAY_REGION)
|
||||
return -EINVAL;
|
||||
|
||||
switch (region_info->index) {
|
||||
case VFIO_PCI_CONFIG_REGION_INDEX:
|
||||
region_info->offset = 0;
|
||||
region_info->size = MDPY_CONFIG_SPACE_SIZE;
|
||||
region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
|
||||
VFIO_REGION_INFO_FLAG_WRITE);
|
||||
break;
|
||||
case VFIO_PCI_BAR0_REGION_INDEX:
|
||||
case MDPY_DISPLAY_REGION:
|
||||
region_info->offset = MDPY_MEMORY_BAR_OFFSET;
|
||||
region_info->size = mdev_state->memsize;
|
||||
region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
|
||||
VFIO_REGION_INFO_FLAG_WRITE |
|
||||
VFIO_REGION_INFO_FLAG_MMAP);
|
||||
break;
|
||||
default:
|
||||
region_info->size = 0;
|
||||
region_info->offset = 0;
|
||||
region_info->flags = 0;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mdpy_get_irq_info(struct mdev_device *mdev,
|
||||
struct vfio_irq_info *irq_info)
|
||||
{
|
||||
irq_info->count = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mdpy_get_device_info(struct mdev_device *mdev,
|
||||
struct vfio_device_info *dev_info)
|
||||
{
|
||||
dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
|
||||
dev_info->num_regions = VFIO_PCI_NUM_REGIONS;
|
||||
dev_info->num_irqs = VFIO_PCI_NUM_IRQS;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mdpy_query_gfx_plane(struct mdev_device *mdev,
|
||||
struct vfio_device_gfx_plane_info *plane)
|
||||
{
|
||||
struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
|
||||
|
||||
if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) {
|
||||
if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE |
|
||||
VFIO_GFX_PLANE_TYPE_REGION))
|
||||
return 0;
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (plane->flags != VFIO_GFX_PLANE_TYPE_REGION)
|
||||
return -EINVAL;
|
||||
|
||||
plane->drm_format = mdev_state->type->format;
|
||||
plane->width = mdev_state->type->width;
|
||||
plane->height = mdev_state->type->height;
|
||||
plane->stride = (mdev_state->type->width *
|
||||
mdev_state->type->bytepp);
|
||||
plane->size = mdev_state->memsize;
|
||||
plane->region_index = MDPY_DISPLAY_REGION;
|
||||
|
||||
/* unused */
|
||||
plane->drm_format_mod = 0;
|
||||
plane->x_pos = 0;
|
||||
plane->y_pos = 0;
|
||||
plane->x_hot = 0;
|
||||
plane->y_hot = 0;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static long mdpy_ioctl(struct mdev_device *mdev, unsigned int cmd,
|
||||
unsigned long arg)
|
||||
{
|
||||
int ret = 0;
|
||||
unsigned long minsz;
|
||||
struct mdev_state *mdev_state;
|
||||
|
||||
mdev_state = mdev_get_drvdata(mdev);
|
||||
|
||||
switch (cmd) {
|
||||
case VFIO_DEVICE_GET_INFO:
|
||||
{
|
||||
struct vfio_device_info info;
|
||||
|
||||
minsz = offsetofend(struct vfio_device_info, num_irqs);
|
||||
|
||||
if (copy_from_user(&info, (void __user *)arg, minsz))
|
||||
return -EFAULT;
|
||||
|
||||
if (info.argsz < minsz)
|
||||
return -EINVAL;
|
||||
|
||||
ret = mdpy_get_device_info(mdev, &info);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
memcpy(&mdev_state->dev_info, &info, sizeof(info));
|
||||
|
||||
if (copy_to_user((void __user *)arg, &info, minsz))
|
||||
return -EFAULT;
|
||||
|
||||
return 0;
|
||||
}
|
||||
case VFIO_DEVICE_GET_REGION_INFO:
|
||||
{
|
||||
struct vfio_region_info info;
|
||||
u16 cap_type_id = 0;
|
||||
void *cap_type = NULL;
|
||||
|
||||
minsz = offsetofend(struct vfio_region_info, offset);
|
||||
|
||||
if (copy_from_user(&info, (void __user *)arg, minsz))
|
||||
return -EFAULT;
|
||||
|
||||
if (info.argsz < minsz)
|
||||
return -EINVAL;
|
||||
|
||||
ret = mdpy_get_region_info(mdev, &info, &cap_type_id,
|
||||
&cap_type);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (copy_to_user((void __user *)arg, &info, minsz))
|
||||
return -EFAULT;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
case VFIO_DEVICE_GET_IRQ_INFO:
|
||||
{
|
||||
struct vfio_irq_info info;
|
||||
|
||||
minsz = offsetofend(struct vfio_irq_info, count);
|
||||
|
||||
if (copy_from_user(&info, (void __user *)arg, minsz))
|
||||
return -EFAULT;
|
||||
|
||||
if ((info.argsz < minsz) ||
|
||||
(info.index >= mdev_state->dev_info.num_irqs))
|
||||
return -EINVAL;
|
||||
|
||||
ret = mdpy_get_irq_info(mdev, &info);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (copy_to_user((void __user *)arg, &info, minsz))
|
||||
return -EFAULT;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
case VFIO_DEVICE_QUERY_GFX_PLANE:
|
||||
{
|
||||
struct vfio_device_gfx_plane_info plane;
|
||||
|
||||
minsz = offsetofend(struct vfio_device_gfx_plane_info,
|
||||
region_index);
|
||||
|
||||
if (copy_from_user(&plane, (void __user *)arg, minsz))
|
||||
return -EFAULT;
|
||||
|
||||
if (plane.argsz < minsz)
|
||||
return -EINVAL;
|
||||
|
||||
ret = mdpy_query_gfx_plane(mdev, &plane);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (copy_to_user((void __user *)arg, &plane, minsz))
|
||||
return -EFAULT;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
case VFIO_DEVICE_SET_IRQS:
|
||||
return -EINVAL;
|
||||
|
||||
case VFIO_DEVICE_RESET:
|
||||
return mdpy_reset(mdev);
|
||||
}
|
||||
return -ENOTTY;
|
||||
}
|
||||
|
||||
static int mdpy_open(struct mdev_device *mdev)
|
||||
{
|
||||
if (!try_module_get(THIS_MODULE))
|
||||
return -ENODEV;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void mdpy_close(struct mdev_device *mdev)
|
||||
{
|
||||
module_put(THIS_MODULE);
|
||||
}
|
||||
|
||||
static ssize_t
|
||||
resolution_show(struct device *dev, struct device_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
struct mdev_device *mdev = mdev_from_dev(dev);
|
||||
struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
|
||||
|
||||
return sprintf(buf, "%dx%d\n",
|
||||
mdev_state->type->width,
|
||||
mdev_state->type->height);
|
||||
}
|
||||
static DEVICE_ATTR_RO(resolution);
|
||||
|
||||
static struct attribute *mdev_dev_attrs[] = {
|
||||
&dev_attr_resolution.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static const struct attribute_group mdev_dev_group = {
|
||||
.name = "vendor",
|
||||
.attrs = mdev_dev_attrs,
|
||||
};
|
||||
|
||||
const struct attribute_group *mdev_dev_groups[] = {
|
||||
&mdev_dev_group,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static ssize_t
|
||||
name_show(struct kobject *kobj, struct device *dev, char *buf)
|
||||
{
|
||||
return sprintf(buf, "%s\n", kobj->name);
|
||||
}
|
||||
MDEV_TYPE_ATTR_RO(name);
|
||||
|
||||
static ssize_t
|
||||
description_show(struct kobject *kobj, struct device *dev, char *buf)
|
||||
{
|
||||
const struct mdpy_type *type = mdpy_find_type(kobj);
|
||||
|
||||
return sprintf(buf, "virtual display, %dx%d framebuffer\n",
|
||||
type ? type->width : 0,
|
||||
type ? type->height : 0);
|
||||
}
|
||||
MDEV_TYPE_ATTR_RO(description);
|
||||
|
||||
static ssize_t
|
||||
available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
|
||||
{
|
||||
return sprintf(buf, "%d\n", max_devices - mdpy_count);
|
||||
}
|
||||
MDEV_TYPE_ATTR_RO(available_instances);
|
||||
|
||||
static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
|
||||
char *buf)
|
||||
{
|
||||
return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
|
||||
}
|
||||
MDEV_TYPE_ATTR_RO(device_api);
|
||||
|
||||
static struct attribute *mdev_types_attrs[] = {
|
||||
&mdev_type_attr_name.attr,
|
||||
&mdev_type_attr_description.attr,
|
||||
&mdev_type_attr_device_api.attr,
|
||||
&mdev_type_attr_available_instances.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static struct attribute_group mdev_type_group1 = {
|
||||
.name = MDPY_TYPE_1,
|
||||
.attrs = mdev_types_attrs,
|
||||
};
|
||||
|
||||
static struct attribute_group mdev_type_group2 = {
|
||||
.name = MDPY_TYPE_2,
|
||||
.attrs = mdev_types_attrs,
|
||||
};
|
||||
|
||||
static struct attribute_group mdev_type_group3 = {
|
||||
.name = MDPY_TYPE_3,
|
||||
.attrs = mdev_types_attrs,
|
||||
};
|
||||
|
||||
static struct attribute_group *mdev_type_groups[] = {
|
||||
&mdev_type_group1,
|
||||
&mdev_type_group2,
|
||||
&mdev_type_group3,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static const struct mdev_parent_ops mdev_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.mdev_attr_groups = mdev_dev_groups,
|
||||
.supported_type_groups = mdev_type_groups,
|
||||
.create = mdpy_create,
|
||||
.remove = mdpy_remove,
|
||||
.open = mdpy_open,
|
||||
.release = mdpy_close,
|
||||
.read = mdpy_read,
|
||||
.write = mdpy_write,
|
||||
.ioctl = mdpy_ioctl,
|
||||
.mmap = mdpy_mmap,
|
||||
};
|
||||
|
||||
static const struct file_operations vd_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
static void mdpy_device_release(struct device *dev)
|
||||
{
|
||||
/* nothing */
|
||||
}
|
||||
|
||||
static int __init mdpy_dev_init(void)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
ret = alloc_chrdev_region(&mdpy_devt, 0, MINORMASK, MDPY_NAME);
|
||||
if (ret < 0) {
|
||||
pr_err("Error: failed to register mdpy_dev, err: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
cdev_init(&mdpy_cdev, &vd_fops);
|
||||
cdev_add(&mdpy_cdev, mdpy_devt, MINORMASK);
|
||||
pr_info("%s: major %d\n", __func__, MAJOR(mdpy_devt));
|
||||
|
||||
mdpy_class = class_create(THIS_MODULE, MDPY_CLASS_NAME);
|
||||
if (IS_ERR(mdpy_class)) {
|
||||
pr_err("Error: failed to register mdpy_dev class\n");
|
||||
ret = PTR_ERR(mdpy_class);
|
||||
goto failed1;
|
||||
}
|
||||
mdpy_dev.class = mdpy_class;
|
||||
mdpy_dev.release = mdpy_device_release;
|
||||
dev_set_name(&mdpy_dev, "%s", MDPY_NAME);
|
||||
|
||||
ret = device_register(&mdpy_dev);
|
||||
if (ret)
|
||||
goto failed2;
|
||||
|
||||
ret = mdev_register_device(&mdpy_dev, &mdev_fops);
|
||||
if (ret)
|
||||
goto failed3;
|
||||
|
||||
return 0;
|
||||
|
||||
failed3:
|
||||
device_unregister(&mdpy_dev);
|
||||
failed2:
|
||||
class_destroy(mdpy_class);
|
||||
failed1:
|
||||
cdev_del(&mdpy_cdev);
|
||||
unregister_chrdev_region(mdpy_devt, MINORMASK);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __exit mdpy_dev_exit(void)
|
||||
{
|
||||
mdpy_dev.bus = NULL;
|
||||
mdev_unregister_device(&mdpy_dev);
|
||||
|
||||
device_unregister(&mdpy_dev);
|
||||
cdev_del(&mdpy_cdev);
|
||||
unregister_chrdev_region(mdpy_devt, MINORMASK);
|
||||
class_destroy(mdpy_class);
|
||||
mdpy_class = NULL;
|
||||
}
|
||||
|
||||
module_init(mdpy_dev_init)
|
||||
module_exit(mdpy_dev_exit)
|
Loading…
Reference in a new issue