#define MAX_PREFETCH_LEN (4*1024*1024U)
+/* Timeout in ms to wait for an active mmu notifier to complete when handling
+ * a pagefault. */
+#define MMU_NOTIFIER_TIMEOUT 1000
+
struct workqueue_struct *mlx5_ib_page_fault_wq;
+void mlx5_ib_invalidate_range(struct ib_umem *umem, unsigned long start,
+ unsigned long end)
+{
+ struct mlx5_ib_mr *mr;
+ const u64 umr_block_mask = (MLX5_UMR_MTT_ALIGNMENT / sizeof(u64)) - 1;
+ u64 idx = 0, blk_start_idx = 0;
+ int in_block = 0;
+ u64 addr;
+
+ if (!umem || !umem->odp_data) {
+ pr_err("invalidation called on NULL umem or non-ODP umem\n");
+ return;
+ }
+
+ mr = umem->odp_data->private;
+
+ if (!mr || !mr->ibmr.pd)
+ return;
+
+ start = max_t(u64, ib_umem_start(umem), start);
+ end = min_t(u64, ib_umem_end(umem), end);
+
+ /*
+ * Iteration one - zap the HW's MTTs. The notifiers_count ensures that
+ * while we are doing the invalidation, no page fault will attempt to
+ * overwrite the same MTTs. Concurent invalidations might race us,
+ * but they will write 0s as well, so no difference in the end result.
+ */
+
+ for (addr = start; addr < end; addr += (u64)umem->page_size) {
+ idx = (addr - ib_umem_start(umem)) / PAGE_SIZE;
+ /*
+ * Strive to write the MTTs in chunks, but avoid overwriting
+ * non-existing MTTs. The huristic here can be improved to
+ * estimate the cost of another UMR vs. the cost of bigger
+ * UMR.
+ */
+ if (umem->odp_data->dma_list[idx] &
+ (ODP_READ_ALLOWED_BIT | ODP_WRITE_ALLOWED_BIT)) {
+ if (!in_block) {
+ blk_start_idx = idx;
+ in_block = 1;
+ }
+ } else {
+ u64 umr_offset = idx & umr_block_mask;
+
+ if (in_block && umr_offset == 0) {
+ mlx5_ib_update_mtt(mr, blk_start_idx,
+ idx - blk_start_idx, 1);
+ in_block = 0;
+ }
+ }
+ }
+ if (in_block)
+ mlx5_ib_update_mtt(mr, blk_start_idx, idx - blk_start_idx + 1,
+ 1);
+
+ /*
+ * We are now sure that the device will not access the
+ * memory. We can safely unmap it, and mark it as dirty if
+ * needed.
+ */
+
+ ib_umem_odp_unmap_dma_pages(umem, start, end);
+}
+
#define COPY_ODP_BIT_MLX_TO_IB(reg, ib_caps, field_name, bit_name) do { \
if (be32_to_cpu(reg.field_name) & MLX5_ODP_SUPPORT_##bit_name) \
ib_caps->field_name |= IB_ODP_SUPPORT_##bit_name; \
if (err)
goto out;
- /* At this point we would copy the capability bits that the driver
- * supports from the hw_caps struct to the caps struct. However, no
- * such capabilities are supported so far. */
+ caps->general_caps = IB_ODP_SUPPORT;
+ COPY_ODP_BIT_MLX_TO_IB(hw_caps, caps, per_transport_caps.ud_odp_caps,
+ SEND);
+ COPY_ODP_BIT_MLX_TO_IB(hw_caps, caps, per_transport_caps.rc_odp_caps,
+ SEND);
+ COPY_ODP_BIT_MLX_TO_IB(hw_caps, caps, per_transport_caps.rc_odp_caps,
+ RECV);
+ COPY_ODP_BIT_MLX_TO_IB(hw_caps, caps, per_transport_caps.rc_odp_caps,
+ WRITE);
+ COPY_ODP_BIT_MLX_TO_IB(hw_caps, caps, per_transport_caps.rc_odp_caps,
+ READ);
+
out:
return err;
}
{
u32 base_key = mlx5_base_mkey(key);
struct mlx5_core_mr *mmr = __mlx5_mr_lookup(dev->mdev, base_key);
+ struct mlx5_ib_mr *mr = container_of(mmr, struct mlx5_ib_mr, mmr);
- if (!mmr || mmr->key != key)
+ if (!mmr || mmr->key != key || !mr->live)
return NULL;
return container_of(mmr, struct mlx5_ib_mr, mmr);
}
current_seq = ACCESS_ONCE(mr->umem->odp_data->notifiers_seq);
+ /*
+ * Ensure the sequence number is valid for some time before we call
+ * gup.
+ */
+ smp_rmb();
/*
* Avoid branches - this code will perform correctly
if (npages > 0) {
mutex_lock(&mr->umem->odp_data->umem_mutex);
- /*
- * No need to check whether the MTTs really belong to
- * this MR, since ib_umem_odp_map_dma_pages already
- * checks this.
- */
- ret = mlx5_ib_update_mtt(mr, start_idx, npages, 0);
+ if (!ib_umem_mmu_notifier_retry(mr->umem, current_seq)) {
+ /*
+ * No need to check whether the MTTs really belong to
+ * this MR, since ib_umem_odp_map_dma_pages already
+ * checks this.
+ */
+ ret = mlx5_ib_update_mtt(mr, start_idx, npages, 0);
+ } else {
+ ret = -EAGAIN;
+ }
mutex_unlock(&mr->umem->odp_data->umem_mutex);
if (ret < 0) {
- pr_err("Failed to update mkey page tables\n");
+ if (ret != -EAGAIN)
+ pr_err("Failed to update mkey page tables\n");
goto srcu_unlock;
}
}
srcu_unlock:
+ if (ret == -EAGAIN) {
+ if (!mr->umem->odp_data->dying) {
+ struct ib_umem_odp *odp_data = mr->umem->odp_data;
+ unsigned long timeout =
+ msecs_to_jiffies(MMU_NOTIFIER_TIMEOUT);
+
+ if (!wait_for_completion_timeout(
+ &odp_data->notifier_completion,
+ timeout)) {
+ pr_warn("timeout waiting for mmu notifier completion\n");
+ }
+ } else {
+ /* The MR is being killed, kill the QP as well. */
+ ret = -EFAULT;
+ }
+ }
srcu_read_unlock(&mib_dev->mr_srcu, srcu_key);
pfault->mpfault.bytes_committed = 0;
return ret ? ret : npages;
projects / deliverable / linux.git / blobdiff