summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/i915/gvt/mmio.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/gpu/drm/i915/gvt/mmio.c')
-rw-r--r--drivers/gpu/drm/i915/gvt/mmio.c304
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 <kevin.tian@intel.com>
+ * Dexuan Cui
+ *
+ * Contributors:
+ * Tina Zhang <tina.zhang@intel.com>
+ * Min He <min.he@intel.com>
+ * Niu Bing <bing.niu@intel.com>
+ * Zhi Wang <zhi.a.wang@intel.com>
+ *
+ */
+
+#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;
+}
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-26 01:14:52 +0000