diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gvt/mmio.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gvt/mmio.c | 304 |
1 files changed, 304 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gvt/mmio.c b/drivers/gpu/drm/i915/gvt/mmio.c new file mode 100644 index 000000000000..09c9450a1946 --- /dev/null +++ b/drivers/gpu/drm/i915/gvt/mmio.c @@ -0,0 +1,304 @@ +/* + * Copyright(c) 2011-2016 Intel Corporation. All rights reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * Authors: + * Ke Yu + * Kevin Tian <[email protected]> + * Dexuan Cui + * + * Contributors: + * Tina Zhang <[email protected]> + * Min He <[email protected]> + * Niu Bing <[email protected]> + * Zhi Wang <[email protected]> + * + */ + +#include "i915_drv.h" +#include "gvt.h" + +/** + * intel_vgpu_gpa_to_mmio_offset - translate a GPA to MMIO offset + * @vgpu: a vGPU + * + * Returns: + * Zero on success, negative error code if failed + */ +int intel_vgpu_gpa_to_mmio_offset(struct intel_vgpu *vgpu, u64 gpa) +{ + u64 gttmmio_gpa = *(u64 *)(vgpu_cfg_space(vgpu) + PCI_BASE_ADDRESS_0) & + ~GENMASK(3, 0); + return gpa - gttmmio_gpa; +} + +#define reg_is_mmio(gvt, reg) \ + (reg >= 0 && reg < gvt->device_info.mmio_size) + +#define reg_is_gtt(gvt, reg) \ + (reg >= gvt->device_info.gtt_start_offset \ + && reg < gvt->device_info.gtt_start_offset + gvt_ggtt_sz(gvt)) + +/** + * intel_vgpu_emulate_mmio_read - emulate MMIO read + * @vgpu: a vGPU + * @pa: guest physical address + * @p_data: data return buffer + * @bytes: access data length + * + * Returns: + * Zero on success, negative error code if failed + */ +int intel_vgpu_emulate_mmio_read(struct intel_vgpu *vgpu, uint64_t pa, + void *p_data, unsigned int bytes) +{ + struct intel_gvt *gvt = vgpu->gvt; + struct intel_gvt_mmio_info *mmio; + unsigned int offset = 0; + int ret = -EINVAL; + + mutex_lock(&gvt->lock); + + if (atomic_read(&vgpu->gtt.n_write_protected_guest_page)) { + struct intel_vgpu_guest_page *gp; + + gp = intel_vgpu_find_guest_page(vgpu, pa >> PAGE_SHIFT); + if (gp) { + ret = intel_gvt_hypervisor_read_gpa(vgpu, pa, + p_data, bytes); + if (ret) { + gvt_err("vgpu%d: guest page read error %d, " + "gfn 0x%lx, pa 0x%llx, var 0x%x, len %d\n", + vgpu->id, ret, + gp->gfn, pa, *(u32 *)p_data, bytes); + } + mutex_unlock(&gvt->lock); + return ret; + } + } + + offset = intel_vgpu_gpa_to_mmio_offset(vgpu, pa); + + if (WARN_ON(bytes > 8)) + goto err; + + if (reg_is_gtt(gvt, offset)) { + if (WARN_ON(!IS_ALIGNED(offset, 4) && !IS_ALIGNED(offset, 8))) + goto err; + if (WARN_ON(bytes != 4 && bytes != 8)) + goto err; + if (WARN_ON(!reg_is_gtt(gvt, offset + bytes - 1))) + goto err; + + ret = intel_vgpu_emulate_gtt_mmio_read(vgpu, offset, + p_data, bytes); + if (ret) + goto err; + mutex_unlock(&gvt->lock); + return ret; + } + + if (WARN_ON_ONCE(!reg_is_mmio(gvt, offset))) { + ret = intel_gvt_hypervisor_read_gpa(vgpu, pa, p_data, bytes); + mutex_unlock(&gvt->lock); + return ret; + } + + if (WARN_ON(!reg_is_mmio(gvt, offset + bytes - 1))) + goto err; + + mmio = intel_gvt_find_mmio_info(gvt, rounddown(offset, 4)); + if (!mmio && !vgpu->mmio.disable_warn_untrack) { + gvt_err("vgpu%d: read untracked MMIO %x len %d val %x\n", + vgpu->id, offset, bytes, *(u32 *)p_data); + + if (offset == 0x206c) { + gvt_err("------------------------------------------\n"); + gvt_err("vgpu%d: likely triggers a gfx reset\n", + vgpu->id); + gvt_err("------------------------------------------\n"); + vgpu->mmio.disable_warn_untrack = true; + } + } + + if (!intel_gvt_mmio_is_unalign(gvt, offset)) { + if (WARN_ON(!IS_ALIGNED(offset, bytes))) + goto err; + } + + if (mmio) { + if (!intel_gvt_mmio_is_unalign(gvt, mmio->offset)) { + if (WARN_ON(offset + bytes > mmio->offset + mmio->size)) + goto err; + if (WARN_ON(mmio->offset != offset)) + goto err; + } + ret = mmio->read(vgpu, offset, p_data, bytes); + } else + ret = intel_vgpu_default_mmio_read(vgpu, offset, p_data, bytes); + + if (ret) + goto err; + + intel_gvt_mmio_set_accessed(gvt, offset); + mutex_unlock(&gvt->lock); + return 0; +err: + gvt_err("vgpu%d: fail to emulate MMIO read %08x len %d\n", + vgpu->id, offset, bytes); + mutex_unlock(&gvt->lock); + return ret; +} + +/** + * intel_vgpu_emulate_mmio_write - emulate MMIO write + * @vgpu: a vGPU + * @pa: guest physical address + * @p_data: write data buffer + * @bytes: access data length + * + * Returns: + * Zero on success, negative error code if failed + */ +int intel_vgpu_emulate_mmio_write(struct intel_vgpu *vgpu, uint64_t pa, + void *p_data, unsigned int bytes) +{ + struct intel_gvt *gvt = vgpu->gvt; + struct intel_gvt_mmio_info *mmio; + unsigned int offset = 0; + u32 old_vreg = 0, old_sreg = 0; + int ret = -EINVAL; + + mutex_lock(&gvt->lock); + + if (atomic_read(&vgpu->gtt.n_write_protected_guest_page)) { + struct intel_vgpu_guest_page *gp; + + gp = intel_vgpu_find_guest_page(vgpu, pa >> PAGE_SHIFT); + if (gp) { + ret = gp->handler(gp, pa, p_data, bytes); + if (ret) { + gvt_err("vgpu%d: guest page write error %d, " + "gfn 0x%lx, pa 0x%llx, var 0x%x, len %d\n", + vgpu->id, ret, + gp->gfn, pa, *(u32 *)p_data, bytes); + } + mutex_unlock(&gvt->lock); + return ret; + } + } + + offset = intel_vgpu_gpa_to_mmio_offset(vgpu, pa); + + if (WARN_ON(bytes > 8)) + goto err; + + if (reg_is_gtt(gvt, offset)) { + if (WARN_ON(!IS_ALIGNED(offset, 4) && !IS_ALIGNED(offset, 8))) + goto err; + if (WARN_ON(bytes != 4 && bytes != 8)) + goto err; + if (WARN_ON(!reg_is_gtt(gvt, offset + bytes - 1))) + goto err; + + ret = intel_vgpu_emulate_gtt_mmio_write(vgpu, offset, + p_data, bytes); + if (ret) + goto err; + mutex_unlock(&gvt->lock); + return ret; + } + + if (WARN_ON_ONCE(!reg_is_mmio(gvt, offset))) { + ret = intel_gvt_hypervisor_write_gpa(vgpu, pa, p_data, bytes); + mutex_unlock(&gvt->lock); + return ret; + } + + mmio = intel_gvt_find_mmio_info(gvt, rounddown(offset, 4)); + if (!mmio && !vgpu->mmio.disable_warn_untrack) + gvt_err("vgpu%d: write untracked MMIO %x len %d val %x\n", + vgpu->id, offset, bytes, *(u32 *)p_data); + + if (!intel_gvt_mmio_is_unalign(gvt, offset)) { + if (WARN_ON(!IS_ALIGNED(offset, bytes))) + goto err; + } + + if (mmio) { + u64 ro_mask = mmio->ro_mask; + + if (!intel_gvt_mmio_is_unalign(gvt, mmio->offset)) { + if (WARN_ON(offset + bytes > mmio->offset + mmio->size)) + goto err; + if (WARN_ON(mmio->offset != offset)) + goto err; + } + + if (intel_gvt_mmio_has_mode_mask(gvt, mmio->offset)) { + old_vreg = vgpu_vreg(vgpu, offset); + old_sreg = vgpu_sreg(vgpu, offset); + } + + if (!ro_mask) { + ret = mmio->write(vgpu, offset, p_data, bytes); + } else { + /* Protect RO bits like HW */ + u64 data = 0; + + /* all register bits are RO. */ + if (ro_mask == ~(u64)0) { + gvt_err("vgpu%d: try to write RO reg %x\n", + vgpu->id, offset); + ret = 0; + goto out; + } + /* keep the RO bits in the virtual register */ + memcpy(&data, p_data, bytes); + data &= ~mmio->ro_mask; + data |= vgpu_vreg(vgpu, offset) & mmio->ro_mask; + ret = mmio->write(vgpu, offset, &data, bytes); + } + + /* higher 16bits of mode ctl regs are mask bits for change */ + if (intel_gvt_mmio_has_mode_mask(gvt, mmio->offset)) { + u32 mask = vgpu_vreg(vgpu, offset) >> 16; + + vgpu_vreg(vgpu, offset) = (old_vreg & ~mask) + | (vgpu_vreg(vgpu, offset) & mask); + vgpu_sreg(vgpu, offset) = (old_sreg & ~mask) + | (vgpu_sreg(vgpu, offset) & mask); + } + } else + ret = intel_vgpu_default_mmio_write(vgpu, offset, p_data, + bytes); + if (ret) + goto err; +out: + intel_gvt_mmio_set_accessed(gvt, offset); + mutex_unlock(&gvt->lock); + return 0; +err: + gvt_err("vgpu%d: fail to emulate MMIO write %08x len %d\n", + vgpu->id, offset, bytes); + mutex_unlock(&gvt->lock); + return ret; +} |