void invalidate_all_iommu_pages(struct domain *d)
{
u32 cmd[4], entry;
unsigned long flags;
struct amd_iommu *iommu;
int domain_id = d->domain_id;
u64 addr_lo = 0x7FFFFFFFFFFFF000ULL & DMA_32BIT_MASK;
u64 addr_hi = 0x7FFFFFFFFFFFF000ULL >> 32;
set_field_in_reg_u32(domain_id, 0,
IOMMU_INV_IOMMU_PAGES_DOMAIN_ID_MASK,
IOMMU_INV_IOMMU_PAGES_DOMAIN_ID_SHIFT, &entry);
set_field_in_reg_u32(IOMMU_CMD_INVALIDATE_IOMMU_PAGES, entry,
IOMMU_CMD_OPCODE_MASK, IOMMU_CMD_OPCODE_SHIFT,
&entry);
cmd[1] = entry;
set_field_in_reg_u32(IOMMU_CONTROL_ENABLED, 0,
IOMMU_INV_IOMMU_PAGES_S_FLAG_MASK,
IOMMU_INV_IOMMU_PAGES_S_FLAG_SHIFT, &entry);
set_field_in_reg_u32(IOMMU_CONTROL_ENABLED, entry,
IOMMU_INV_IOMMU_PAGES_PDE_FLAG_MASK,
IOMMU_INV_IOMMU_PAGES_PDE_FLAG_SHIFT, &entry);
set_field_in_reg_u32((u32)addr_lo >> PAGE_SHIFT, entry,
IOMMU_INV_IOMMU_PAGES_ADDR_LOW_MASK,
IOMMU_INV_IOMMU_PAGES_ADDR_LOW_SHIFT, &entry);
cmd[2] = entry;
set_field_in_reg_u32((u32)addr_hi, 0,
IOMMU_INV_IOMMU_PAGES_ADDR_HIGH_MASK,
IOMMU_INV_IOMMU_PAGES_ADDR_HIGH_SHIFT, &entry);
cmd[3] = entry;
cmd[0] = 0;
for_each_amd_iommu ( iommu )
{
spin_lock_irqsave(&iommu->lock, flags);
send_iommu_command(iommu, cmd);
flush_command_buffer(iommu);
spin_unlock_irqrestore(&iommu->lock, flags);
}
}
int amd_iommu_unmap_page(struct domain *d, unsigned long gfn)
{
u64 iommu_l2e;
unsigned long flags;
struct amd_iommu *iommu;
struct hvm_iommu *hd = domain_hvm_iommu(d);
BUG_ON( !hd->root_table );
spin_lock_irqsave(&hd->mapping_lock, flags);
if ( is_hvm_domain(d) && !hd->p2m_synchronized )
{
spin_unlock_irqrestore(&hd->mapping_lock, flags);
return 0;
}
iommu_l2e = iommu_l2e_from_pfn(hd->root_table, hd->paging_mode, gfn);
if ( iommu_l2e == 0 )
{
amd_iov_error("Invalid IO pagetable entry gfn = %lx\n", gfn);
spin_unlock_irqrestore(&hd->mapping_lock, flags);
return -EFAULT;
}
/* mark PTE as 'page not present' */
clear_iommu_l1e_present(iommu_l2e, gfn);
spin_unlock_irqrestore(&hd->mapping_lock, flags);
/* send INVALIDATE_IOMMU_PAGES command */
for_each_amd_iommu ( iommu )
{
spin_lock_irqsave(&iommu->lock, flags);
invalidate_iommu_page(iommu, (u64)gfn << PAGE_SHIFT, hd->domain_id);
flush_command_buffer(iommu);
spin_unlock_irqrestore(&iommu->lock, flags);
}
return 0;
}
void reset_command_buffer() {
flush_command_buffer();
create_command_buffer();
}