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         trace_inject_msi(vgpu->id, addr, data);
 137
 138         ret = intel_gvt_host.mpt->inject_msi(vgpu->handle, addr, data);
 139         if (ret)
 140                 return ret;
 141         return 0;
 142 }
 143
 144 /**
 145  * intel_gvt_hypervisor_set_wp_page - translate a host VA into MFN
 146  * @p: host kernel virtual address
 147  *
 148  * Returns:
 149  * MFN on success, INTEL_GVT_INVALID_ADDR if failed.
 150  */
 151 static inline unsigned long intel_gvt_hypervisor_virt_to_mfn(void *p)
 152 {
 153         return intel_gvt_host.mpt->from_virt_to_mfn(p);
 154 }
 155
 156 /**
 157  * intel_gvt_hypervisor_enable_page_track - track a guest page
 158  * @vgpu: a vGPU
 159  * @gfn: the gfn of guest
 160  *
 161  * Returns:
 162  * Zero on success, negative error code if failed.
 163  */
 164 static inline int intel_gvt_hypervisor_enable_page_track(
 165                 struct intel_vgpu *vgpu, unsigned long gfn)
 166 {
 167         return intel_gvt_host.mpt->enable_page_track(vgpu->handle, gfn);
 168 }
 169
 170 /**
 171  * intel_gvt_hypervisor_disable_page_track - untrack a guest page
 172  * @vgpu: a vGPU
 173  * @gfn: the gfn of guest
 174  *
 175  * Returns:
 176  * Zero on success, negative error code if failed.
 177  */
 178 static inline int intel_gvt_hypervisor_disable_page_track(
 179                 struct intel_vgpu *vgpu, unsigned long gfn)
 180 {
 181         return intel_gvt_host.mpt->disable_page_track(vgpu->handle, gfn);
 182 }
 183
 184 /**
 185  * intel_gvt_hypervisor_read_gpa - copy data from GPA to host data buffer
 186  * @vgpu: a vGPU
 187  * @gpa: guest physical address
 188  * @buf: host data buffer
 189  * @len: data length
 190  *
 191  * Returns:
 192  * Zero on success, negative error code if failed.
 193  */
 194 static inline int intel_gvt_hypervisor_read_gpa(struct intel_vgpu *vgpu,
 195                 unsigned long gpa, void *buf, unsigned long len)
 196 {
 197         return intel_gvt_host.mpt->read_gpa(vgpu->handle, gpa, buf, len);
 198 }
 199
 200 /**
 201  * intel_gvt_hypervisor_write_gpa - copy data from host data buffer to GPA
 202  * @vgpu: a vGPU
 203  * @gpa: guest physical address
 204  * @buf: host data buffer
 205  * @len: data length
 206  *
 207  * Returns:
 208  * Zero on success, negative error code if failed.
 209  */
 210 static inline int intel_gvt_hypervisor_write_gpa(struct intel_vgpu *vgpu,
 211                 unsigned long gpa, void *buf, unsigned long len)
 212 {
 213         return intel_gvt_host.mpt->write_gpa(vgpu->handle, gpa, buf, len);
 214 }
 215
 216 /**
 217  * intel_gvt_hypervisor_gfn_to_mfn - translate a GFN to MFN
 218  * @vgpu: a vGPU
 219  * @gpfn: guest pfn
 220  *
 221  * Returns:
 222  * MFN on success, INTEL_GVT_INVALID_ADDR if failed.
 223  */
 224 static inline unsigned long intel_gvt_hypervisor_gfn_to_mfn(
 225                 struct intel_vgpu *vgpu, unsigned long gfn)
 226 {
 227         return intel_gvt_host.mpt->gfn_to_mfn(vgpu->handle, gfn);
 228 }
 229
 230 /**
 231  * intel_gvt_hypervisor_dma_map_guest_page - setup dma map for guest page
 232  * @vgpu: a vGPU
 233  * @gfn: guest pfn
 234  * @size: page size
 235  * @dma_addr: retrieve allocated dma addr
 236  *
 237  * Returns:
 238  * 0 on success, negative error code if failed.
 239  */
 240 static inline int intel_gvt_hypervisor_dma_map_guest_page(
 241                 struct intel_vgpu *vgpu, unsigned long gfn, unsigned long size,
 242                 dma_addr_t *dma_addr)
 243 {
 244         return intel_gvt_host.mpt->dma_map_guest_page(vgpu->handle, gfn, size,
 245                                                       dma_addr);
 246 }
 247
 248 /**
 249  * intel_gvt_hypervisor_dma_unmap_guest_page - cancel dma map for guest page
 250  * @vgpu: a vGPU
 251  * @dma_addr: the mapped dma addr
 252  */
 253 static inline void intel_gvt_hypervisor_dma_unmap_guest_page(
 254                 struct intel_vgpu *vgpu, dma_addr_t dma_addr)
 255 {
 256         intel_gvt_host.mpt->dma_unmap_guest_page(vgpu->handle, dma_addr);
 257 }
 258
 259 /**
 260  * intel_gvt_hypervisor_map_gfn_to_mfn - map a GFN region to MFN
 261  * @vgpu: a vGPU
 262  * @gfn: guest PFN
 263  * @mfn: host PFN
 264  * @nr: amount of PFNs
 265  * @map: map or unmap
 266  *
 267  * Returns:
 268  * Zero on success, negative error code if failed.
 269  */
 270 static inline int intel_gvt_hypervisor_map_gfn_to_mfn(
 271                 struct intel_vgpu *vgpu, unsigned long gfn,
 272                 unsigned long mfn, unsigned int nr,
 273                 bool map)
 274 {
 275         /* a MPT implementation could have MMIO mapped elsewhere */
 276         if (!intel_gvt_host.mpt->map_gfn_to_mfn)
 277                 return 0;
 278
 279         return intel_gvt_host.mpt->map_gfn_to_mfn(vgpu->handle, gfn, mfn, nr,
 280                                                   map);
 281 }
 282
 283 /**
 284  * intel_gvt_hypervisor_set_trap_area - Trap a guest PA region
 285  * @vgpu: a vGPU
 286  * @start: the beginning of the guest physical address region
 287  * @end: the end of the guest physical address region
 288  * @map: map or unmap
 289  *
 290  * Returns:
 291  * Zero on success, negative error code if failed.
 292  */
 293 static inline int intel_gvt_hypervisor_set_trap_area(
 294                 struct intel_vgpu *vgpu, u64 start, u64 end, bool map)
 295 {
 296         /* a MPT implementation could have MMIO trapped elsewhere */
 297         if (!intel_gvt_host.mpt->set_trap_area)
 298                 return 0;
 299
 300         return intel_gvt_host.mpt->set_trap_area(vgpu->handle, start, end, map);
 301 }
 302
 303 /**
 304  * intel_gvt_hypervisor_set_opregion - Set opregion for guest
 305  * @vgpu: a vGPU
 306  *
 307  * Returns:
 308  * Zero on success, negative error code if failed.
 309  */
 310 static inline int intel_gvt_hypervisor_set_opregion(struct intel_vgpu *vgpu)
 311 {
 312         if (!intel_gvt_host.mpt->set_opregion)
 313                 return 0;
 314
 315         return intel_gvt_host.mpt->set_opregion(vgpu);
 316 }
 317
 318 /**
 319  * intel_gvt_hypervisor_get_vfio_device - increase vfio device ref count
 320  * @vgpu: a vGPU
 321  *
 322  * Returns:
 323  * Zero on success, negative error code if failed.
 324  */
 325 static inline int intel_gvt_hypervisor_get_vfio_device(struct intel_vgpu *vgpu)
 326 {
 327         if (!intel_gvt_host.mpt->get_vfio_device)
 328                 return 0;
 329
 330         return intel_gvt_host.mpt->get_vfio_device(vgpu);
 331 }
 332
 333 /**
 334  * intel_gvt_hypervisor_put_vfio_device - decrease vfio device ref count
 335  * @vgpu: a vGPU
 336  *
 337  * Returns:
 338  * Zero on success, negative error code if failed.
 339  */
 340 static inline void intel_gvt_hypervisor_put_vfio_device(struct intel_vgpu *vgpu)
 341 {
 342         if (!intel_gvt_host.mpt->put_vfio_device)
 343                 return;
 344
 345         intel_gvt_host.mpt->put_vfio_device(vgpu);
 346 }
 347
 348 /**
 349  * intel_gvt_hypervisor_is_valid_gfn - check if a visible gfn
 350  * @vgpu: a vGPU
 351  * @gfn: guest PFN
 352  *
 353  * Returns:
 354  * true on valid gfn, false on not.
 355  */
 356 static inline bool intel_gvt_hypervisor_is_valid_gfn(
 357                 struct intel_vgpu *vgpu, unsigned long gfn)
 358 {
 359         if (!intel_gvt_host.mpt->is_valid_gfn)
 360                 return true;
 361
 362         return intel_gvt_host.mpt->is_valid_gfn(vgpu->handle, gfn);
 363 }
 364
 365 #endif /* _GVT_MPT_H_ */