#include <linux/hugetlb.h>
#include <linux/list.h>
#include <linux/anon_inodes.h>
+#include <linux/iommu.h>
+#include <linux/file.h>
#include <asm/tlbflush.h>
#include <asm/kvm_ppc.h>
#include <asm/udbg.h>
#include <asm/iommu.h>
#include <asm/tce.h>
+#include <asm/mmu_context.h>
static unsigned long kvmppc_tce_pages(unsigned long iommu_pages)
{
return ret;
}
+static void kvm_spapr_tce_iommu_table_free(struct rcu_head *head)
+{
+ struct kvmppc_spapr_tce_iommu_table *stit = container_of(head,
+ struct kvmppc_spapr_tce_iommu_table, rcu);
+
+ iommu_tce_table_put(stit->tbl);
+
+ kfree(stit);
+}
+
+static void kvm_spapr_tce_liobn_put(struct kref *kref)
+{
+ struct kvmppc_spapr_tce_iommu_table *stit = container_of(kref,
+ struct kvmppc_spapr_tce_iommu_table, kref);
+
+ list_del_rcu(&stit->next);
+
+ call_rcu(&stit->rcu, kvm_spapr_tce_iommu_table_free);
+}
+
+extern void kvm_spapr_tce_release_iommu_group(struct kvm *kvm,
+ struct iommu_group *grp)
+{
+ int i;
+ struct kvmppc_spapr_tce_table *stt;
+ struct kvmppc_spapr_tce_iommu_table *stit, *tmp;
+ struct iommu_table_group *table_group = NULL;
+
+ list_for_each_entry_rcu(stt, &kvm->arch.spapr_tce_tables, list) {
+
+ table_group = iommu_group_get_iommudata(grp);
+ if (WARN_ON(!table_group))
+ continue;
+
+ list_for_each_entry_safe(stit, tmp, &stt->iommu_tables, next) {
+ for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
+ if (table_group->tables[i] != stit->tbl)
+ continue;
+
+ kref_put(&stit->kref, kvm_spapr_tce_liobn_put);
+ return;
+ }
+ }
+ }
+}
+
+extern long kvm_spapr_tce_attach_iommu_group(struct kvm *kvm, int tablefd,
+ struct iommu_group *grp)
+{
+ struct kvmppc_spapr_tce_table *stt = NULL;
+ bool found = false;
+ struct iommu_table *tbl = NULL;
+ struct iommu_table_group *table_group;
+ long i;
+ struct kvmppc_spapr_tce_iommu_table *stit;
+ struct fd f;
+
+ f = fdget(tablefd);
+ if (!f.file)
+ return -EBADF;
+
+ list_for_each_entry_rcu(stt, &kvm->arch.spapr_tce_tables, list) {
+ if (stt == f.file->private_data) {
+ found = true;
+ break;
+ }
+ }
+
+ fdput(f);
+
+ if (!found)
+ return -EINVAL;
+
+ table_group = iommu_group_get_iommudata(grp);
+ if (WARN_ON(!table_group))
+ return -EFAULT;
+
+ for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
+ struct iommu_table *tbltmp = table_group->tables[i];
+
+ if (!tbltmp)
+ continue;
+ /*
+ * Make sure hardware table parameters are exactly the same;
+ * this is used in the TCE handlers where boundary checks
+ * use only the first attached table.
+ */
+ if ((tbltmp->it_page_shift == stt->page_shift) &&
+ (tbltmp->it_offset == stt->offset) &&
+ (tbltmp->it_size == stt->size)) {
+ /*
+ * Reference the table to avoid races with
+ * add/remove DMA windows.
+ */
+ tbl = iommu_tce_table_get(tbltmp);
+ break;
+ }
+ }
+ if (!tbl)
+ return -EINVAL;
+
+ list_for_each_entry_rcu(stit, &stt->iommu_tables, next) {
+ if (tbl != stit->tbl)
+ continue;
+
+ if (!kref_get_unless_zero(&stit->kref)) {
+ /* stit is being destroyed */
+ iommu_tce_table_put(tbl);
+ return -ENOTTY;
+ }
+ /*
+ * The table is already known to this KVM, we just increased
+ * its KVM reference counter and can return.
+ */
+ return 0;
+ }
+
+ stit = kzalloc(sizeof(*stit), GFP_KERNEL);
+ if (!stit) {
+ iommu_tce_table_put(tbl);
+ return -ENOMEM;
+ }
+
+ stit->tbl = tbl;
+ kref_init(&stit->kref);
+
+ list_add_rcu(&stit->next, &stt->iommu_tables);
+
+ return 0;
+}
+
static void release_spapr_tce_table(struct rcu_head *head)
{
struct kvmppc_spapr_tce_table *stt = container_of(head,
static int kvm_spapr_tce_release(struct inode *inode, struct file *filp)
{
struct kvmppc_spapr_tce_table *stt = filp->private_data;
+ struct kvmppc_spapr_tce_iommu_table *stit, *tmp;
list_del_rcu(&stt->list);
+ list_for_each_entry_safe(stit, tmp, &stt->iommu_tables, next) {
+ WARN_ON(!kref_read(&stit->kref));
+ while (1) {
+ if (kref_put(&stit->kref, kvm_spapr_tce_liobn_put))
+ break;
+ }
+ }
+
kvm_put_kvm(stt->kvm);
kvmppc_account_memlimit(
stt->offset = args->offset;
stt->size = size;
stt->kvm = kvm;
+ INIT_LIST_HEAD_RCU(&stt->iommu_tables);
for (i = 0; i < npages; i++) {
stt->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
return ret;
}
+static void kvmppc_clear_tce(struct iommu_table *tbl, unsigned long entry)
+{
+ unsigned long hpa = 0;
+ enum dma_data_direction dir = DMA_NONE;
+
+ iommu_tce_xchg(tbl, entry, &hpa, &dir);
+}
+
+static long kvmppc_tce_iommu_mapped_dec(struct kvm *kvm,
+ struct iommu_table *tbl, unsigned long entry)
+{
+ struct mm_iommu_table_group_mem_t *mem = NULL;
+ const unsigned long pgsize = 1ULL << tbl->it_page_shift;
+ unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
+
+ if (!pua)
+ /* it_userspace allocation might be delayed */
+ return H_TOO_HARD;
+
+ mem = mm_iommu_lookup(kvm->mm, *pua, pgsize);
+ if (!mem)
+ return H_TOO_HARD;
+
+ mm_iommu_mapped_dec(mem);
+
+ *pua = 0;
+
+ return H_SUCCESS;
+}
+
+static long kvmppc_tce_iommu_unmap(struct kvm *kvm,
+ struct iommu_table *tbl, unsigned long entry)
+{
+ enum dma_data_direction dir = DMA_NONE;
+ unsigned long hpa = 0;
+ long ret;
+
+ if (WARN_ON_ONCE(iommu_tce_xchg(tbl, entry, &hpa, &dir)))
+ return H_HARDWARE;
+
+ if (dir == DMA_NONE)
+ return H_SUCCESS;
+
+ ret = kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry);
+ if (ret != H_SUCCESS)
+ iommu_tce_xchg(tbl, entry, &hpa, &dir);
+
+ return ret;
+}
+
+long kvmppc_tce_iommu_map(struct kvm *kvm, struct iommu_table *tbl,
+ unsigned long entry, unsigned long ua,
+ enum dma_data_direction dir)
+{
+ long ret;
+ unsigned long hpa, *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
+ struct mm_iommu_table_group_mem_t *mem;
+
+ if (!pua)
+ /* it_userspace allocation might be delayed */
+ return H_TOO_HARD;
+
+ mem = mm_iommu_lookup(kvm->mm, ua, 1ULL << tbl->it_page_shift);
+ if (!mem)
+ /* This only handles v2 IOMMU type, v1 is handled via ioctl() */
+ return H_TOO_HARD;
+
+ if (WARN_ON_ONCE(mm_iommu_ua_to_hpa(mem, ua, &hpa)))
+ return H_HARDWARE;
+
+ if (mm_iommu_mapped_inc(mem))
+ return H_CLOSED;
+
+ ret = iommu_tce_xchg(tbl, entry, &hpa, &dir);
+ if (WARN_ON_ONCE(ret)) {
+ mm_iommu_mapped_dec(mem);
+ return H_HARDWARE;
+ }
+
+ if (dir != DMA_NONE)
+ kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry);
+
+ *pua = ua;
+
+ return 0;
+}
+
long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
unsigned long ioba, unsigned long tce)
{
struct kvmppc_spapr_tce_table *stt;
- long ret;
+ long ret, idx;
+ struct kvmppc_spapr_tce_iommu_table *stit;
+ unsigned long entry, ua = 0;
+ enum dma_data_direction dir;
/* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
/* liobn, ioba, tce); */
if (ret != H_SUCCESS)
return ret;
- kvmppc_tce_put(stt, ioba >> stt->page_shift, tce);
+ dir = iommu_tce_direction(tce);
+ if ((dir != DMA_NONE) && kvmppc_gpa_to_ua(vcpu->kvm,
+ tce & ~(TCE_PCI_READ | TCE_PCI_WRITE), &ua, NULL))
+ return H_PARAMETER;
+
+ entry = ioba >> stt->page_shift;
+
+ list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
+ if (dir == DMA_NONE) {
+ ret = kvmppc_tce_iommu_unmap(vcpu->kvm,
+ stit->tbl, entry);
+ } else {
+ idx = srcu_read_lock(&vcpu->kvm->srcu);
+ ret = kvmppc_tce_iommu_map(vcpu->kvm, stit->tbl,
+ entry, ua, dir);
+ srcu_read_unlock(&vcpu->kvm->srcu, idx);
+ }
+
+ if (ret == H_SUCCESS)
+ continue;
+
+ if (ret == H_TOO_HARD)
+ return ret;
+
+ WARN_ON_ONCE(1);
+ kvmppc_clear_tce(stit->tbl, entry);
+ }
+
+ kvmppc_tce_put(stt, entry, tce);
return H_SUCCESS;
}
unsigned long entry, ua = 0;
u64 __user *tces;
u64 tce;
+ struct kvmppc_spapr_tce_iommu_table *stit;
stt = kvmppc_find_table(vcpu->kvm, liobn);
if (!stt)
if (ret != H_SUCCESS)
goto unlock_exit;
+ if (kvmppc_gpa_to_ua(vcpu->kvm,
+ tce & ~(TCE_PCI_READ | TCE_PCI_WRITE),
+ &ua, NULL))
+ return H_PARAMETER;
+
+ list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
+ ret = kvmppc_tce_iommu_map(vcpu->kvm,
+ stit->tbl, entry + i, ua,
+ iommu_tce_direction(tce));
+
+ if (ret == H_SUCCESS)
+ continue;
+
+ if (ret == H_TOO_HARD)
+ goto unlock_exit;
+
+ WARN_ON_ONCE(1);
+ kvmppc_clear_tce(stit->tbl, entry);
+ }
+
kvmppc_tce_put(stt, entry + i, tce);
}
{
struct kvmppc_spapr_tce_table *stt;
long i, ret;
+ struct kvmppc_spapr_tce_iommu_table *stit;
stt = kvmppc_find_table(vcpu->kvm, liobn);
if (!stt)
if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ))
return H_PARAMETER;
+ list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
+ unsigned long entry = ioba >> stit->tbl->it_page_shift;
+
+ for (i = 0; i < npages; ++i) {
+ ret = kvmppc_tce_iommu_unmap(vcpu->kvm,
+ stit->tbl, entry + i);
+
+ if (ret == H_SUCCESS)
+ continue;
+
+ if (ret == H_TOO_HARD)
+ return ret;
+
+ WARN_ON_ONCE(1);
+ kvmppc_clear_tce(stit->tbl, entry);
+ }
+ }
+
for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift))
kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value);
projects / karo-tx-linux.git / blobdiff