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hv: Add suspend/resume callback for vtd

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To handle S3 enter/exit for vtd.

Signed-off-by: Edwin Zhai <edwin.zhai@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Yin Fengwei 2018-06-04 15:04:25 +08:00 committed by lijinxia
parent d2ea4546c3
commit 8eaf4d2ab6
3 changed files with 89 additions and 0 deletions
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4
hypervisor/arch/x86/Kconfig
View File

@ -15,6 +15,10 @@ config NR_IOAPICS
int "Maximum number of IOAPICs supported"
default 1
config MAX_IOMMU_NUM
int "Maximum number of iommu dev"
default 2
config STACK_SIZE
hex "Capacity of each stack used in the hypervisor"
default 0x2000

79
hypervisor/arch/x86/vtd.c
View File

@ -1135,6 +1135,85 @@ void disable_iommu(void)
}
}
/* 4 iommu fault register state */
#define IOMMU_FAULT_REGISTER_STATE_NUM 4
static uint32_t
iommu_fault_state[CONFIG_MAX_IOMMU_NUM][IOMMU_FAULT_REGISTER_STATE_NUM];
void suspend_iommu(void)
{
struct dmar_drhd_rt *dmar_unit;
struct list_head *pos;
uint32_t i, iommu_idx = 0;
list_for_each(pos, &dmar_drhd_units) {
dmar_unit = list_entry(pos, struct dmar_drhd_rt, list);
if (dmar_unit->drhd->ignore)
continue;
/* flush */
dmar_write_buffer_flush(dmar_unit);
dmar_invalid_context_cache_global(dmar_unit);
dmar_invalid_iotlb_global(dmar_unit);
/* save IOMMU fault register state */
for (i = 0; i < IOMMU_FAULT_REGISTER_STATE_NUM; i++)
iommu_fault_state[iommu_idx][i] =
iommu_read32(dmar_unit, DMAR_FECTL_REG +
i * IOMMU_FAULT_REGISTER_STATE_NUM);
/* disable translation */
dmar_disable_translation(dmar_unit);
/* If the number of real iommu devices is larger than we
* defined in kconfig.
*/
if (iommu_idx++ > CONFIG_MAX_IOMMU_NUM) {
pr_err("iommu dev number is larger than pre-defined");
break;
}
}
}
void resume_iommu(void)
{
struct dmar_drhd_rt *dmar_unit;
struct list_head *pos;
uint32_t i, iommu_idx = 0;
/* restore IOMMU fault register state */
list_for_each(pos, &dmar_drhd_units) {
dmar_unit = list_entry(pos, struct dmar_drhd_rt, list);
if (dmar_unit->drhd->ignore)
continue;
/* set root table */
dmar_set_root_table(dmar_unit);
/* flush */
dmar_write_buffer_flush(dmar_unit);
dmar_invalid_context_cache_global(dmar_unit);
dmar_invalid_iotlb_global(dmar_unit);
/* restore IOMMU fault register state */
for (i = 0; i < IOMMU_FAULT_REGISTER_STATE_NUM; i++)
iommu_write32(dmar_unit, DMAR_FECTL_REG +
i * IOMMU_FAULT_REGISTER_STATE_NUM,
iommu_fault_state[iommu_idx][i]);
/* enable translation */
dmar_enable_translation(dmar_unit);
/* If the number of real iommu devices is larger than we
* defined in kconfig.
*/
if (iommu_idx++ > CONFIG_MAX_IOMMU_NUM) {
pr_err("iommu dev number is larger than pre-defined");
break;
}
}
}
int init_iommu(void)
{
uint16_t bus;

6
hypervisor/include/arch/x86/vtd.h
View File

@ -229,6 +229,12 @@ void enable_iommu(void);
/* Disable translation of iommu*/
void disable_iommu(void);
/* suspend iomu */
void suspend_iommu(void);
/* resume iomu */
void resume_iommu(void);
/* iommu initialization */
int init_iommu(void);
#endif