drivers/gpu/drm/i915/gvt/mmio.c

   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  *    Ke Yu
  25  *    Kevin Tian <kevin.tian@intel.com>
  26  *    Dexuan Cui
  27  *
  28  * Contributors:
  29  *    Tina Zhang <tina.zhang@intel.com>
  30  *    Min He <min.he@intel.com>
  31  *    Niu Bing <bing.niu@intel.com>
  32  *    Zhi Wang <zhi.a.wang@intel.com>
  33  *
  34  */
  35
  36 #include "i915_drv.h"
  37 #include "gvt.h"
  38
  39 /**
  40  * intel_vgpu_gpa_to_mmio_offset - translate a GPA to MMIO offset
  41  * @vgpu: a vGPU
  42  *
  43  * Returns:
  44  * Zero on success, negative error code if failed
  45  */
  46 int intel_vgpu_gpa_to_mmio_offset(struct intel_vgpu *vgpu, u64 gpa)
  47 {
  48         u64 gttmmio_gpa = intel_vgpu_get_bar_gpa(vgpu, PCI_BASE_ADDRESS_0);
  49         return gpa - gttmmio_gpa;
  50 }
  51
  52 #define reg_is_mmio(gvt, reg)  \
  53         (reg >= 0 && reg < gvt->device_info.mmio_size)
  54
  55 #define reg_is_gtt(gvt, reg)   \
  56         (reg >= gvt->device_info.gtt_start_offset \
  57          && reg < gvt->device_info.gtt_start_offset + gvt_ggtt_sz(gvt))
  58
  59 static void failsafe_emulate_mmio_rw(struct intel_vgpu *vgpu, uint64_t pa,
  60                 void *p_data, unsigned int bytes, bool read)
  61 {
  62         struct intel_gvt *gvt = NULL;
  63         void *pt = NULL;
  64         unsigned int offset = 0;
  65
  66         if (!vgpu || !p_data)
  67                 return;
  68
  69         gvt = vgpu->gvt;
  70         mutex_lock(&gvt->lock);
  71         offset = intel_vgpu_gpa_to_mmio_offset(vgpu, pa);
  72         if (reg_is_mmio(gvt, offset)) {
  73                 if (read)
  74                         intel_vgpu_default_mmio_read(vgpu, offset, p_data,
  75                                         bytes);
  76                 else
  77                         intel_vgpu_default_mmio_write(vgpu, offset, p_data,
  78                                         bytes);
  79         } else if (reg_is_gtt(gvt, offset) &&
  80                         vgpu->gtt.ggtt_mm->virtual_page_table) {
  81                 offset -= gvt->device_info.gtt_start_offset;
  82                 pt = vgpu->gtt.ggtt_mm->virtual_page_table + offset;
  83                 if (read)
  84                         memcpy(p_data, pt, bytes);
  85                 else
  86                         memcpy(pt, p_data, bytes);
  87
  88         }
  89         mutex_unlock(&gvt->lock);
  90 }
  91
  92 /**
  93  * intel_vgpu_emulate_mmio_read - emulate MMIO read
  94  * @vgpu: a vGPU
  95  * @pa: guest physical address
  96  * @p_data: data return buffer
  97  * @bytes: access data length
  98  *
  99  * Returns:
 100  * Zero on success, negative error code if failed
 101  */
 102 int intel_vgpu_emulate_mmio_read(struct intel_vgpu *vgpu, uint64_t pa,
 103                 void *p_data, unsigned int bytes)
 104 {
 105         struct intel_gvt *gvt = vgpu->gvt;
 106         unsigned int offset = 0;
 107         int ret = -EINVAL;
 108
 109         if (vgpu->failsafe) {
 110                 failsafe_emulate_mmio_rw(vgpu, pa, p_data, bytes, true);
 111                 return 0;
 112         }
 113         mutex_lock(&gvt->lock);
 114
 115         offset = intel_vgpu_gpa_to_mmio_offset(vgpu, pa);
 116
 117         if (WARN_ON(bytes > 8))
 118                 goto err;
 119
 120         if (reg_is_gtt(gvt, offset)) {
 121                 if (WARN_ON(!IS_ALIGNED(offset, 4) && !IS_ALIGNED(offset, 8)))
 122                         goto err;
 123                 if (WARN_ON(bytes != 4 && bytes != 8))
 124                         goto err;
 125                 if (WARN_ON(!reg_is_gtt(gvt, offset + bytes - 1)))
 126                         goto err;
 127
 128                 ret = intel_vgpu_emulate_gtt_mmio_read(vgpu, offset,
 129                                 p_data, bytes);
 130                 if (ret)
 131                         goto err;
 132                 goto out;
 133         }
 134
 135         if (WARN_ON_ONCE(!reg_is_mmio(gvt, offset))) {
 136                 ret = intel_gvt_hypervisor_read_gpa(vgpu, pa, p_data, bytes);
 137                 goto out;
 138         }
 139
 140         if (WARN_ON(!reg_is_mmio(gvt, offset + bytes - 1)))
 141                 goto err;
 142
 143         if (!intel_gvt_mmio_is_unalign(gvt, offset)) {
 144                 if (WARN_ON(!IS_ALIGNED(offset, bytes)))
 145                         goto err;
 146         }
 147
 148         ret = intel_vgpu_mmio_reg_rw(vgpu, offset, p_data, bytes, true);
 149         if (ret < 0)
 150                 goto err;
 151
 152         intel_gvt_mmio_set_accessed(gvt, offset);
 153         ret = 0;
 154         goto out;
 155
 156 err:
 157         gvt_vgpu_err("fail to emulate MMIO read %08x len %d\n",
 158                         offset, bytes);
 159 out:
 160         mutex_unlock(&gvt->lock);
 161         return ret;
 162 }
 163
 164 /**
 165  * intel_vgpu_emulate_mmio_write - emulate MMIO write
 166  * @vgpu: a vGPU
 167  * @pa: guest physical address
 168  * @p_data: write data buffer
 169  * @bytes: access data length
 170  *
 171  * Returns:
 172  * Zero on success, negative error code if failed
 173  */
 174 int intel_vgpu_emulate_mmio_write(struct intel_vgpu *vgpu, uint64_t pa,
 175                 void *p_data, unsigned int bytes)
 176 {
 177         struct intel_gvt *gvt = vgpu->gvt;
 178         unsigned int offset = 0;
 179         int ret = -EINVAL;
 180
 181         if (vgpu->failsafe) {
 182                 failsafe_emulate_mmio_rw(vgpu, pa, p_data, bytes, false);
 183                 return 0;
 184         }
 185
 186         mutex_lock(&gvt->lock);
 187
 188         offset = intel_vgpu_gpa_to_mmio_offset(vgpu, pa);
 189
 190         if (WARN_ON(bytes > 8))
 191                 goto err;
 192
 193         if (reg_is_gtt(gvt, offset)) {
 194                 if (WARN_ON(!IS_ALIGNED(offset, 4) && !IS_ALIGNED(offset, 8)))
 195                         goto err;
 196                 if (WARN_ON(bytes != 4 && bytes != 8))
 197                         goto err;
 198                 if (WARN_ON(!reg_is_gtt(gvt, offset + bytes - 1)))
 199                         goto err;
 200
 201                 ret = intel_vgpu_emulate_gtt_mmio_write(vgpu, offset,
 202                                 p_data, bytes);
 203                 if (ret)
 204                         goto err;
 205                 goto out;
 206         }
 207
 208         if (WARN_ON_ONCE(!reg_is_mmio(gvt, offset))) {
 209                 ret = intel_gvt_hypervisor_write_gpa(vgpu, pa, p_data, bytes);
 210                 goto out;
 211         }
 212
 213         ret = intel_vgpu_mmio_reg_rw(vgpu, offset, p_data, bytes, false);
 214         if (ret < 0)
 215                 goto err;
 216
 217         intel_gvt_mmio_set_accessed(gvt, offset);
 218         ret = 0;
 219         goto out;
 220 err:
 221         gvt_vgpu_err("fail to emulate MMIO write %08x len %d\n", offset,
 222                      bytes);
 223 out:
 224         mutex_unlock(&gvt->lock);
 225         return ret;
 226 }
 227
 228
 229 /**
 230  * intel_vgpu_reset_mmio - reset virtual MMIO space
 231  * @vgpu: a vGPU
 232  *
 233  */
 234 void intel_vgpu_reset_mmio(struct intel_vgpu *vgpu, bool dmlr)
 235 {
 236         struct intel_gvt *gvt = vgpu->gvt;
 237         const struct intel_gvt_device_info *info = &gvt->device_info;
 238         void  *mmio = gvt->firmware.mmio;
 239
 240         if (dmlr) {
 241                 memcpy(vgpu->mmio.vreg, mmio, info->mmio_size);
 242                 memcpy(vgpu->mmio.sreg, mmio, info->mmio_size);
 243
 244                 vgpu_vreg_t(vgpu, GEN6_GT_THREAD_STATUS_REG) = 0;
 245
 246                 /* set the bit 0:2(Core C-State ) to C0 */
 247                 vgpu_vreg_t(vgpu, GEN6_GT_CORE_STATUS) = 0;
 248
 249                 vgpu->mmio.disable_warn_untrack = false;
 250         } else {
 251 #define GVT_GEN8_MMIO_RESET_OFFSET              (0x44200)
 252                 /* only reset the engine related, so starting with 0x44200
 253                  * interrupt include DE,display mmio related will not be
 254                  * touched
 255                  */
 256                 memcpy(vgpu->mmio.vreg, mmio, GVT_GEN8_MMIO_RESET_OFFSET);
 257                 memcpy(vgpu->mmio.sreg, mmio, GVT_GEN8_MMIO_RESET_OFFSET);
 258         }
 259
 260 }
 261
 262 /**
 263  * intel_vgpu_init_mmio - init MMIO  space
 264  * @vgpu: a vGPU
 265  *
 266  * Returns:
 267  * Zero on success, negative error code if failed
 268  */
 269 int intel_vgpu_init_mmio(struct intel_vgpu *vgpu)
 270 {
 271         const struct intel_gvt_device_info *info = &vgpu->gvt->device_info;
 272
 273         vgpu->mmio.vreg = vzalloc(info->mmio_size * 2);
 274         if (!vgpu->mmio.vreg)
 275                 return -ENOMEM;
 276
 277         vgpu->mmio.sreg = vgpu->mmio.vreg + info->mmio_size;
 278
 279         intel_vgpu_reset_mmio(vgpu, true);
 280
 281         return 0;
 282 }
 283
 284 /**
 285  * intel_vgpu_clean_mmio - clean MMIO space
 286  * @vgpu: a vGPU
 287  *
 288  */
 289 void intel_vgpu_clean_mmio(struct intel_vgpu *vgpu)
 290 {
 291         vfree(vgpu->mmio.vreg);
 292         vgpu->mmio.vreg = vgpu->mmio.sreg = NULL;
 293 }