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20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
38 INTEL_GVT_PCI_BAR_GTTMMIO = 0,
39 INTEL_GVT_PCI_BAR_APERTURE,
40 INTEL_GVT_PCI_BAR_PIO,
41 INTEL_GVT_PCI_BAR_MAX,
44 /* bitmap for writable bits (RW or RW1C bits, but cannot co-exist in one
45 * byte) byte by byte in standard pci configuration space. (not the full
48 static const u8 pci_cfg_space_rw_bmp[PCI_INTERRUPT_LINE + 4] = {
49 [PCI_COMMAND] = 0xff, 0x07,
50 [PCI_STATUS] = 0x00, 0xf9, /* the only one RW1C byte */
51 [PCI_CACHE_LINE_SIZE] = 0xff,
52 [PCI_BASE_ADDRESS_0 ... PCI_CARDBUS_CIS - 1] = 0xff,
53 [PCI_ROM_ADDRESS] = 0x01, 0xf8, 0xff, 0xff,
54 [PCI_INTERRUPT_LINE] = 0xff,
58 * vgpu_pci_cfg_mem_write - write virtual cfg space memory
61 * @src: src ptr to write
62 * @bytes: number of bytes
64 * Use this function to write virtual cfg space memory.
65 * For standard cfg space, only RW bits can be changed,
66 * and we emulates the RW1C behavior of PCI_STATUS register.
68 static void vgpu_pci_cfg_mem_write(struct intel_vgpu *vgpu, unsigned int off,
69 u8 *src, unsigned int bytes)
71 u8 *cfg_base = vgpu_cfg_space(vgpu);
75 for (; i < bytes && (off + i < sizeof(pci_cfg_space_rw_bmp)); i++) {
76 mask = pci_cfg_space_rw_bmp[off + i];
77 old = cfg_base[off + i];
81 * The PCI_STATUS high byte has RW1C bits, here
82 * emulates clear by writing 1 for these bits.
83 * Writing a 0b to RW1C bits has no effect.
85 if (off + i == PCI_STATUS + 1)
86 new = (~new & old) & mask;
88 cfg_base[off + i] = (old & ~mask) | new;
91 /* For other configuration space directly copy as it is. */
93 memcpy(cfg_base + off + i, src + i, bytes - i);
97 * intel_vgpu_emulate_cfg_read - emulate vGPU configuration space read
100 * @p_data: return data ptr
101 * @bytes: number of bytes to read
104 * Zero on success, negative error code if failed.
106 int intel_vgpu_emulate_cfg_read(struct intel_vgpu *vgpu, unsigned int offset,
107 void *p_data, unsigned int bytes)
109 struct drm_i915_private *i915 = vgpu->gvt->gt->i915;
111 if (drm_WARN_ON(&i915->drm, bytes > 4))
114 if (drm_WARN_ON(&i915->drm,
115 offset + bytes > vgpu->gvt->device_info.cfg_space_size))
118 memcpy(p_data, vgpu_cfg_space(vgpu) + offset, bytes);
122 static int map_aperture(struct intel_vgpu *vgpu, bool map)
124 phys_addr_t aperture_pa = vgpu_aperture_pa_base(vgpu);
125 unsigned long aperture_sz = vgpu_aperture_sz(vgpu);
130 if (map == vgpu->cfg_space.bar[INTEL_GVT_PCI_BAR_APERTURE].tracked)
133 val = vgpu_cfg_space(vgpu)[PCI_BASE_ADDRESS_2];
134 if (val & PCI_BASE_ADDRESS_MEM_TYPE_64)
135 val = *(u64 *)(vgpu_cfg_space(vgpu) + PCI_BASE_ADDRESS_2);
137 val = *(u32 *)(vgpu_cfg_space(vgpu) + PCI_BASE_ADDRESS_2);
139 first_gfn = (val + vgpu_aperture_offset(vgpu)) >> PAGE_SHIFT;
141 ret = intel_gvt_hypervisor_map_gfn_to_mfn(vgpu, first_gfn,
142 aperture_pa >> PAGE_SHIFT,
143 aperture_sz >> PAGE_SHIFT,
148 vgpu->cfg_space.bar[INTEL_GVT_PCI_BAR_APERTURE].tracked = map;
152 static int trap_gttmmio(struct intel_vgpu *vgpu, bool trap)
158 if (trap == vgpu->cfg_space.bar[INTEL_GVT_PCI_BAR_GTTMMIO].tracked)
161 val = vgpu_cfg_space(vgpu)[PCI_BASE_ADDRESS_0];
162 if (val & PCI_BASE_ADDRESS_MEM_TYPE_64)
163 start = *(u64 *)(vgpu_cfg_space(vgpu) + PCI_BASE_ADDRESS_0);
165 start = *(u32 *)(vgpu_cfg_space(vgpu) + PCI_BASE_ADDRESS_0);
167 start &= ~GENMASK(3, 0);
168 end = start + vgpu->cfg_space.bar[INTEL_GVT_PCI_BAR_GTTMMIO].size - 1;
170 ret = intel_gvt_hypervisor_set_trap_area(vgpu, start, end, trap);
174 vgpu->cfg_space.bar[INTEL_GVT_PCI_BAR_GTTMMIO].tracked = trap;
178 static int emulate_pci_command_write(struct intel_vgpu *vgpu,
179 unsigned int offset, void *p_data, unsigned int bytes)
181 u8 old = vgpu_cfg_space(vgpu)[offset];
182 u8 new = *(u8 *)p_data;
183 u8 changed = old ^ new;
186 vgpu_pci_cfg_mem_write(vgpu, offset, p_data, bytes);
187 if (!(changed & PCI_COMMAND_MEMORY))
190 if (old & PCI_COMMAND_MEMORY) {
191 ret = trap_gttmmio(vgpu, false);
194 ret = map_aperture(vgpu, false);
198 ret = trap_gttmmio(vgpu, true);
201 ret = map_aperture(vgpu, true);
209 static int emulate_pci_rom_bar_write(struct intel_vgpu *vgpu,
210 unsigned int offset, void *p_data, unsigned int bytes)
212 u32 *pval = (u32 *)(vgpu_cfg_space(vgpu) + offset);
213 u32 new = *(u32 *)(p_data);
215 if ((new & PCI_ROM_ADDRESS_MASK) == PCI_ROM_ADDRESS_MASK)
216 /* We don't have rom, return size of 0. */
219 vgpu_pci_cfg_mem_write(vgpu, offset, p_data, bytes);
223 static int emulate_pci_bar_write(struct intel_vgpu *vgpu, unsigned int offset,
224 void *p_data, unsigned int bytes)
226 u32 new = *(u32 *)(p_data);
227 bool lo = IS_ALIGNED(offset, 8);
231 vgpu_cfg_space(vgpu)[PCI_COMMAND] & PCI_COMMAND_MEMORY;
232 struct intel_vgpu_pci_bar *bars = vgpu->cfg_space.bar;
235 * Power-up software can determine how much address
236 * space the device requires by writing a value of
237 * all 1's to the register and then reading the value
238 * back. The device will return 0's in all don't-care
241 if (new == 0xffffffff) {
243 case PCI_BASE_ADDRESS_0:
244 case PCI_BASE_ADDRESS_1:
245 size = ~(bars[INTEL_GVT_PCI_BAR_GTTMMIO].size -1);
246 intel_vgpu_write_pci_bar(vgpu, offset,
247 size >> (lo ? 0 : 32), lo);
249 * Untrap the BAR, since guest hasn't configured a
252 ret = trap_gttmmio(vgpu, false);
254 case PCI_BASE_ADDRESS_2:
255 case PCI_BASE_ADDRESS_3:
256 size = ~(bars[INTEL_GVT_PCI_BAR_APERTURE].size -1);
257 intel_vgpu_write_pci_bar(vgpu, offset,
258 size >> (lo ? 0 : 32), lo);
259 ret = map_aperture(vgpu, false);
262 /* Unimplemented BARs */
263 intel_vgpu_write_pci_bar(vgpu, offset, 0x0, false);
267 case PCI_BASE_ADDRESS_0:
268 case PCI_BASE_ADDRESS_1:
270 * Untrap the old BAR first, since guest has
271 * re-configured the BAR
273 trap_gttmmio(vgpu, false);
274 intel_vgpu_write_pci_bar(vgpu, offset, new, lo);
275 ret = trap_gttmmio(vgpu, mmio_enabled);
277 case PCI_BASE_ADDRESS_2:
278 case PCI_BASE_ADDRESS_3:
279 map_aperture(vgpu, false);
280 intel_vgpu_write_pci_bar(vgpu, offset, new, lo);
281 ret = map_aperture(vgpu, mmio_enabled);
284 intel_vgpu_write_pci_bar(vgpu, offset, new, lo);
291 * intel_vgpu_emulate_cfg_read - emulate vGPU configuration space write
294 * @p_data: write data ptr
295 * @bytes: number of bytes to write
298 * Zero on success, negative error code if failed.
300 int intel_vgpu_emulate_cfg_write(struct intel_vgpu *vgpu, unsigned int offset,
301 void *p_data, unsigned int bytes)
303 struct drm_i915_private *i915 = vgpu->gvt->gt->i915;
306 if (drm_WARN_ON(&i915->drm, bytes > 4))
309 if (drm_WARN_ON(&i915->drm,
310 offset + bytes > vgpu->gvt->device_info.cfg_space_size))
313 /* First check if it's PCI_COMMAND */
314 if (IS_ALIGNED(offset, 2) && offset == PCI_COMMAND) {
315 if (drm_WARN_ON(&i915->drm, bytes > 2))
317 return emulate_pci_command_write(vgpu, offset, p_data, bytes);
320 switch (rounddown(offset, 4)) {
321 case PCI_ROM_ADDRESS:
322 if (drm_WARN_ON(&i915->drm, !IS_ALIGNED(offset, 4)))
324 return emulate_pci_rom_bar_write(vgpu, offset, p_data, bytes);
326 case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_5:
327 if (drm_WARN_ON(&i915->drm, !IS_ALIGNED(offset, 4)))
329 return emulate_pci_bar_write(vgpu, offset, p_data, bytes);
331 case INTEL_GVT_PCI_SWSCI:
332 if (drm_WARN_ON(&i915->drm, !IS_ALIGNED(offset, 4)))
334 ret = intel_vgpu_emulate_opregion_request(vgpu, *(u32 *)p_data);
339 case INTEL_GVT_PCI_OPREGION:
340 if (drm_WARN_ON(&i915->drm, !IS_ALIGNED(offset, 4)))
342 ret = intel_vgpu_opregion_base_write_handler(vgpu,
347 vgpu_pci_cfg_mem_write(vgpu, offset, p_data, bytes);
350 vgpu_pci_cfg_mem_write(vgpu, offset, p_data, bytes);
357 * intel_vgpu_init_cfg_space - init vGPU configuration space when create vGPU
360 * @primary: is the vGPU presented as primary
363 void intel_vgpu_init_cfg_space(struct intel_vgpu *vgpu,
366 struct intel_gvt *gvt = vgpu->gvt;
367 const struct intel_gvt_device_info *info = &gvt->device_info;
370 memcpy(vgpu_cfg_space(vgpu), gvt->firmware.cfg_space,
371 info->cfg_space_size);
374 vgpu_cfg_space(vgpu)[PCI_CLASS_DEVICE] =
375 INTEL_GVT_PCI_CLASS_VGA_OTHER;
376 vgpu_cfg_space(vgpu)[PCI_CLASS_PROG] =
377 INTEL_GVT_PCI_CLASS_VGA_OTHER;
380 /* Show guest that there isn't any stolen memory.*/
381 gmch_ctl = (u16 *)(vgpu_cfg_space(vgpu) + INTEL_GVT_PCI_GMCH_CONTROL);
382 *gmch_ctl &= ~(BDW_GMCH_GMS_MASK << BDW_GMCH_GMS_SHIFT);
384 intel_vgpu_write_pci_bar(vgpu, PCI_BASE_ADDRESS_2,
385 gvt_aperture_pa_base(gvt), true);
387 vgpu_cfg_space(vgpu)[PCI_COMMAND] &= ~(PCI_COMMAND_IO
389 | PCI_COMMAND_MASTER);
391 * Clear the bar upper 32bit and let guest to assign the new value
393 memset(vgpu_cfg_space(vgpu) + PCI_BASE_ADDRESS_1, 0, 4);
394 memset(vgpu_cfg_space(vgpu) + PCI_BASE_ADDRESS_3, 0, 4);
395 memset(vgpu_cfg_space(vgpu) + PCI_BASE_ADDRESS_4, 0, 8);
396 memset(vgpu_cfg_space(vgpu) + INTEL_GVT_PCI_OPREGION, 0, 4);
398 vgpu->cfg_space.bar[INTEL_GVT_PCI_BAR_GTTMMIO].size =
399 pci_resource_len(gvt->gt->i915->drm.pdev, 0);
400 vgpu->cfg_space.bar[INTEL_GVT_PCI_BAR_APERTURE].size =
401 pci_resource_len(gvt->gt->i915->drm.pdev, 2);
403 memset(vgpu_cfg_space(vgpu) + PCI_ROM_ADDRESS, 0, 4);
407 * intel_vgpu_reset_cfg_space - reset vGPU configuration space
412 void intel_vgpu_reset_cfg_space(struct intel_vgpu *vgpu)
414 u8 cmd = vgpu_cfg_space(vgpu)[PCI_COMMAND];
415 bool primary = vgpu_cfg_space(vgpu)[PCI_CLASS_DEVICE] !=
416 INTEL_GVT_PCI_CLASS_VGA_OTHER;
418 if (cmd & PCI_COMMAND_MEMORY) {
419 trap_gttmmio(vgpu, false);
420 map_aperture(vgpu, false);
424 * Currently we only do such reset when vGPU is not
425 * owned by any VM, so we simply restore entire cfg
426 * space to default value.
428 intel_vgpu_init_cfg_space(vgpu, primary);