drivers/gpu/drm/i915/gvt/mpt.h

   1 /*
   2  * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eddie Dong <eddie.dong@intel.com>
  25  *    Dexuan Cui
  26  *    Jike Song <jike.song@intel.com>
  27  *
  28  * Contributors:
  29  *    Zhi Wang <zhi.a.wang@intel.com>
  30  *
  31  */
  32
  33 #ifndef _GVT_MPT_H_
  34 #define _GVT_MPT_H_
  35
  36 /**
  37  * DOC: Hypervisor Service APIs for GVT-g Core Logic
  38  *
  39  * This is the glue layer between specific hypervisor MPT modules and GVT-g core
  40  * logic. Each kind of hypervisor MPT module provides a collection of function
  41  * callbacks and will be attached to GVT host when the driver is loading.
  42  * GVT-g core logic will call these APIs to request specific services from
  43  * hypervisor.
  44  */
  45
  46 /**
  47  * intel_gvt_hypervisor_host_init - init GVT-g host side
  48  *
  49  * Returns:
  50  * Zero on success, negative error code if failed
  51  */
  52 static inline int intel_gvt_hypervisor_host_init(struct device *dev,
  53                         void *gvt, const void *ops)
  54 {
  55         /* optional to provide */
  56         if (!intel_gvt_host.mpt->host_init)
  57                 return 0;
  58
  59         return intel_gvt_host.mpt->host_init(dev, gvt, ops);
  60 }
  61
  62 /**
  63  * intel_gvt_hypervisor_host_exit - exit GVT-g host side
  64  */
  65 static inline void intel_gvt_hypervisor_host_exit(struct device *dev,
  66                         void *gvt)
  67 {
  68         /* optional to provide */
  69         if (!intel_gvt_host.mpt->host_exit)
  70                 return;
  71
  72         intel_gvt_host.mpt->host_exit(dev, gvt);
  73 }
  74
  75 /**
  76  * intel_gvt_hypervisor_attach_vgpu - call hypervisor to initialize vGPU
  77  * related stuffs inside hypervisor.
  78  *
  79  * Returns:
  80  * Zero on success, negative error code if failed.
  81  */
  82 static inline int intel_gvt_hypervisor_attach_vgpu(struct intel_vgpu *vgpu)
  83 {
  84         /* optional to provide */
  85         if (!intel_gvt_host.mpt->attach_vgpu)
  86                 return 0;
  87
  88         return intel_gvt_host.mpt->attach_vgpu(vgpu, &vgpu->handle);
  89 }
  90
  91 /**
  92  * intel_gvt_hypervisor_detach_vgpu - call hypervisor to release vGPU
  93  * related stuffs inside hypervisor.
  94  *
  95  * Returns:
  96  * Zero on success, negative error code if failed.
  97  */
  98 static inline void intel_gvt_hypervisor_detach_vgpu(struct intel_vgpu *vgpu)
  99 {
 100         /* optional to provide */
 101         if (!intel_gvt_host.mpt->detach_vgpu)
 102                 return;
 103
 104         intel_gvt_host.mpt->detach_vgpu(vgpu->handle);
 105 }
 106
 107 #define MSI_CAP_CONTROL(offset) (offset + 2)
 108 #define MSI_CAP_ADDRESS(offset) (offset + 4)
 109 #define MSI_CAP_DATA(offset) (offset + 8)
 110 #define MSI_CAP_EN 0x1
 111
 112 /**
 113  * intel_gvt_hypervisor_inject_msi - inject a MSI interrupt into vGPU
 114  *
 115  * Returns:
 116  * Zero on success, negative error code if failed.
 117  */
 118 static inline int intel_gvt_hypervisor_inject_msi(struct intel_vgpu *vgpu)
 119 {
 120         unsigned long offset = vgpu->gvt->device_info.msi_cap_offset;
 121         u16 control, data;
 122         u32 addr;
 123         int ret;
 124
 125         control = *(u16 *)(vgpu_cfg_space(vgpu) + MSI_CAP_CONTROL(offset));
 126         addr = *(u32 *)(vgpu_cfg_space(vgpu) + MSI_CAP_ADDRESS(offset));
 127         data = *(u16 *)(vgpu_cfg_space(vgpu) + MSI_CAP_DATA(offset));
 128
 129         /* Do not generate MSI if MSIEN is disable */
 130         if (!(control & MSI_CAP_EN))
 131                 return 0;
 132
 133         if (WARN(control & GENMASK(15, 1), "only support one MSI format\n"))
 134                 return -EINVAL;
 135
 136         gvt_dbg_irq("vgpu%d: inject msi address %x data%x\n", vgpu->id, addr,
 137                     data);
 138
 139         ret = intel_gvt_host.mpt->inject_msi(vgpu->handle, addr, data);
 140         if (ret)
 141                 return ret;
 142         return 0;
 143 }
 144
 145 /**
 146  * intel_gvt_hypervisor_set_wp_page - translate a host VA into MFN
 147  * @p: host kernel virtual address
 148  *
 149  * Returns:
 150  * MFN on success, INTEL_GVT_INVALID_ADDR if failed.
 151  */
 152 static inline unsigned long intel_gvt_hypervisor_virt_to_mfn(void *p)
 153 {
 154         return intel_gvt_host.mpt->from_virt_to_mfn(p);
 155 }
 156
 157 /**
 158  * intel_gvt_hypervisor_set_wp_page - set a guest page to write-protected
 159  * @vgpu: a vGPU
 160  * @p: intel_vgpu_guest_page
 161  *
 162  * Returns:
 163  * Zero on success, negative error code if failed.
 164  */
 165 static inline int intel_gvt_hypervisor_set_wp_page(struct intel_vgpu *vgpu,
 166                 struct intel_vgpu_guest_page *p)
 167 {
 168         int ret;
 169
 170         if (p->writeprotection)
 171                 return 0;
 172
 173         ret = intel_gvt_host.mpt->set_wp_page(vgpu->handle, p->gfn);
 174         if (ret)
 175                 return ret;
 176         p->writeprotection = true;
 177         atomic_inc(&vgpu->gtt.n_write_protected_guest_page);
 178         return 0;
 179 }
 180
 181 /**
 182  * intel_gvt_hypervisor_unset_wp_page - remove the write-protection of a
 183  * guest page
 184  * @vgpu: a vGPU
 185  * @p: intel_vgpu_guest_page
 186  *
 187  * Returns:
 188  * Zero on success, negative error code if failed.
 189  */
 190 static inline int intel_gvt_hypervisor_unset_wp_page(struct intel_vgpu *vgpu,
 191                 struct intel_vgpu_guest_page *p)
 192 {
 193         int ret;
 194
 195         if (!p->writeprotection)
 196                 return 0;
 197
 198         ret = intel_gvt_host.mpt->unset_wp_page(vgpu->handle, p->gfn);
 199         if (ret)
 200                 return ret;
 201         p->writeprotection = false;
 202         atomic_dec(&vgpu->gtt.n_write_protected_guest_page);
 203         return 0;
 204 }
 205
 206 /**
 207  * intel_gvt_hypervisor_read_gpa - copy data from GPA to host data buffer
 208  * @vgpu: a vGPU
 209  * @gpa: guest physical address
 210  * @buf: host data buffer
 211  * @len: data length
 212  *
 213  * Returns:
 214  * Zero on success, negative error code if failed.
 215  */
 216 static inline int intel_gvt_hypervisor_read_gpa(struct intel_vgpu *vgpu,
 217                 unsigned long gpa, void *buf, unsigned long len)
 218 {
 219         return intel_gvt_host.mpt->read_gpa(vgpu->handle, gpa, buf, len);
 220 }
 221
 222 /**
 223  * intel_gvt_hypervisor_write_gpa - copy data from host data buffer to GPA
 224  * @vgpu: a vGPU
 225  * @gpa: guest physical address
 226  * @buf: host data buffer
 227  * @len: data length
 228  *
 229  * Returns:
 230  * Zero on success, negative error code if failed.
 231  */
 232 static inline int intel_gvt_hypervisor_write_gpa(struct intel_vgpu *vgpu,
 233                 unsigned long gpa, void *buf, unsigned long len)
 234 {
 235         return intel_gvt_host.mpt->write_gpa(vgpu->handle, gpa, buf, len);
 236 }
 237
 238 /**
 239  * intel_gvt_hypervisor_gfn_to_mfn - translate a GFN to MFN
 240  * @vgpu: a vGPU
 241  * @gpfn: guest pfn
 242  *
 243  * Returns:
 244  * MFN on success, INTEL_GVT_INVALID_ADDR if failed.
 245  */
 246 static inline unsigned long intel_gvt_hypervisor_gfn_to_mfn(
 247                 struct intel_vgpu *vgpu, unsigned long gfn)
 248 {
 249         return intel_gvt_host.mpt->gfn_to_mfn(vgpu->handle, gfn);
 250 }
 251
 252 /**
 253  * intel_gvt_hypervisor_map_gfn_to_mfn - map a GFN region to MFN
 254  * @vgpu: a vGPU
 255  * @gfn: guest PFN
 256  * @mfn: host PFN
 257  * @nr: amount of PFNs
 258  * @map: map or unmap
 259  *
 260  * Returns:
 261  * Zero on success, negative error code if failed.
 262  */
 263 static inline int intel_gvt_hypervisor_map_gfn_to_mfn(
 264                 struct intel_vgpu *vgpu, unsigned long gfn,
 265                 unsigned long mfn, unsigned int nr,
 266                 bool map)
 267 {
 268         /* a MPT implementation could have MMIO mapped elsewhere */
 269         if (!intel_gvt_host.mpt->map_gfn_to_mfn)
 270                 return 0;
 271
 272         return intel_gvt_host.mpt->map_gfn_to_mfn(vgpu->handle, gfn, mfn, nr,
 273                                                   map);
 274 }
 275
 276 /**
 277  * intel_gvt_hypervisor_set_trap_area - Trap a guest PA region
 278  * @vgpu: a vGPU
 279  * @start: the beginning of the guest physical address region
 280  * @end: the end of the guest physical address region
 281  * @map: map or unmap
 282  *
 283  * Returns:
 284  * Zero on success, negative error code if failed.
 285  */
 286 static inline int intel_gvt_hypervisor_set_trap_area(
 287                 struct intel_vgpu *vgpu, u64 start, u64 end, bool map)
 288 {
 289         /* a MPT implementation could have MMIO trapped elsewhere */
 290         if (!intel_gvt_host.mpt->set_trap_area)
 291                 return 0;
 292
 293         return intel_gvt_host.mpt->set_trap_area(vgpu->handle, start, end, map);
 294 }
 295
 296 #endif /* _GVT_MPT_H_ */