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/*
* 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 = intel_vgpu_get_bar_gpa(vgpu, PCI_BASE_ADDRESS_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))
static void failsafe_emulate_mmio_rw(struct intel_vgpu *vgpu, uint64_t pa,
void *p_data, unsigned int bytes, bool read)
{
struct intel_gvt *gvt = NULL;
void *pt = NULL;
unsigned int offset = 0;
if (!vgpu || !p_data)
return;
gvt = vgpu->gvt;
mutex_lock(&gvt->lock);
offset = intel_vgpu_gpa_to_mmio_offset(vgpu, pa);
if (reg_is_mmio(gvt, offset)) {
if (read)
intel_vgpu_default_mmio_read(vgpu, offset, p_data,
bytes);
else
intel_vgpu_default_mmio_write(vgpu, offset, p_data,
bytes);
} else if (reg_is_gtt(gvt, offset)) {
offset -= gvt->device_info.gtt_start_offset;
pt = vgpu->gtt.ggtt_mm->ggtt_mm.virtual_ggtt + offset;
if (read)
memcpy(p_data, pt, bytes);
else
memcpy(pt, p_data, bytes);
}
mutex_unlock(&gvt->lock);
}
/**
* 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;
unsigned int offset = 0;
int ret = -EINVAL;
if (vgpu->failsafe) {
failsafe_emulate_mmio_rw(vgpu, pa, p_data, bytes, true);
return 0;
}
mutex_lock(&gvt->lock);
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_ggtt_mmio_read(vgpu, offset,
p_data, bytes);
if (ret)
goto err;
goto out;
}
if (WARN_ON_ONCE(!reg_is_mmio(gvt, offset))) {
ret = intel_gvt_hypervisor_read_gpa(vgpu, pa, p_data, bytes);
goto out;
}
if (WARN_ON(!reg_is_mmio(gvt, offset + bytes - 1)))
goto err;
if (!intel_gvt_mmio_is_unalign(gvt, offset)) {
if (WARN_ON(!IS_ALIGNED(offset, bytes)))
goto err;
}
ret = intel_vgpu_mmio_reg_rw(vgpu, offset, p_data, bytes, true);
if (ret < 0)
goto err;
intel_gvt_mmio_set_accessed(gvt, offset);
ret = 0;
goto out;
err:
gvt_vgpu_err("fail to emulate MMIO read %08x len %d\n",
offset, bytes);
out:
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;
unsigned int offset = 0;
int ret = -EINVAL;
if (vgpu->failsafe) {
failsafe_emulate_mmio_rw(vgpu, pa, p_data, bytes, false);
return 0;
}
mutex_lock(&gvt->lock);
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_ggtt_mmio_write(vgpu, offset,
p_data, bytes);
if (ret)
goto err;
goto out;
}
if (WARN_ON_ONCE(!reg_is_mmio(gvt, offset))) {
ret = intel_gvt_hypervisor_write_gpa(vgpu, pa, p_data, bytes);
goto out;
}
ret = intel_vgpu_mmio_reg_rw(vgpu, offset, p_data, bytes, false);
if (ret < 0)
goto err;
intel_gvt_mmio_set_accessed(gvt, offset);
ret = 0;
goto out;
err:
gvt_vgpu_err("fail to emulate MMIO write %08x len %d\n", offset,
bytes);
out:
mutex_unlock(&gvt->lock);
return ret;
}
/**
* intel_vgpu_reset_mmio - reset virtual MMIO space
* @vgpu: a vGPU
*
*/
void intel_vgpu_reset_mmio(struct intel_vgpu *vgpu, bool dmlr)
{
struct intel_gvt *gvt = vgpu->gvt;
const struct intel_gvt_device_info *info = &gvt->device_info;
void *mmio = gvt->firmware.mmio;
if (dmlr) {
memcpy(vgpu->mmio.vreg, mmio, info->mmio_size);
memcpy(vgpu->mmio.sreg, mmio, info->mmio_size);
vgpu_vreg_t(vgpu, GEN6_GT_THREAD_STATUS_REG) = 0;
/* set the bit 0:2(Core C-State ) to C0 */
vgpu_vreg_t(vgpu, GEN6_GT_CORE_STATUS) = 0;
vgpu->mmio.disable_warn_untrack = false;
} else {
#define GVT_GEN8_MMIO_RESET_OFFSET (0x44200)
/* only reset the engine related, so starting with 0x44200
* interrupt include DE,display mmio related will not be
* touched
*/
memcpy(vgpu->mmio.vreg, mmio, GVT_GEN8_MMIO_RESET_OFFSET);
memcpy(vgpu->mmio.sreg, mmio, GVT_GEN8_MMIO_RESET_OFFSET);
}
}
/**
* intel_vgpu_init_mmio - init MMIO space
* @vgpu: a vGPU
*
* Returns:
* Zero on success, negative error code if failed
*/
int intel_vgpu_init_mmio(struct intel_vgpu *vgpu)
{
const struct intel_gvt_device_info *info = &vgpu->gvt->device_info;
vgpu->mmio.vreg = vzalloc(info->mmio_size * 2);
if (!vgpu->mmio.vreg)
return -ENOMEM;
vgpu->mmio.sreg = vgpu->mmio.vreg + info->mmio_size;
intel_vgpu_reset_mmio(vgpu, true);
return 0;
}
/**
* intel_vgpu_clean_mmio - clean MMIO space
* @vgpu: a vGPU
*
*/
void intel_vgpu_clean_mmio(struct intel_vgpu *vgpu)
{
vfree(vgpu->mmio.vreg);
vgpu->mmio.vreg = vgpu->mmio.sreg = NULL;
}
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