#include <asm/pat.h>
#endif
#include <linux/sched.h>
+#include <linux/delay.h>
#include <rdma/ib_user_verbs.h>
#include <rdma/ib_addr.h>
#include <rdma/ib_cache.h>
#include <linux/mlx5/port.h>
#include <linux/mlx5/vport.h>
+#include <linux/list.h>
#include <rdma/ib_smi.h>
#include <rdma/ib_umem.h>
#include <linux/in.h>
goto out_uars;
}
+ INIT_LIST_HEAD(&context->vma_private_list);
INIT_LIST_HEAD(&context->db_page_list);
mutex_init(&context->db_page_mutex);
return get_arg(offset);
}
+static void mlx5_ib_vma_open(struct vm_area_struct *area)
+{
+ /* vma_open is called when a new VMA is created on top of our VMA. This
+ * is done through either mremap flow or split_vma (usually due to
+ * mlock, madvise, munmap, etc.) We do not support a clone of the VMA,
+ * as this VMA is strongly hardware related. Therefore we set the
+ * vm_ops of the newly created/cloned VMA to NULL, to prevent it from
+ * calling us again and trying to do incorrect actions. We assume that
+ * the original VMA size is exactly a single page, and therefore all
+ * "splitting" operation will not happen to it.
+ */
+ area->vm_ops = NULL;
+}
+
+static void mlx5_ib_vma_close(struct vm_area_struct *area)
+{
+ struct mlx5_ib_vma_private_data *mlx5_ib_vma_priv_data;
+
+ /* It's guaranteed that all VMAs opened on a FD are closed before the
+ * file itself is closed, therefore no sync is needed with the regular
+ * closing flow. (e.g. mlx5 ib_dealloc_ucontext)
+ * However need a sync with accessing the vma as part of
+ * mlx5_ib_disassociate_ucontext.
+ * The close operation is usually called under mm->mmap_sem except when
+ * process is exiting.
+ * The exiting case is handled explicitly as part of
+ * mlx5_ib_disassociate_ucontext.
+ */
+ mlx5_ib_vma_priv_data = (struct mlx5_ib_vma_private_data *)area->vm_private_data;
+
+ /* setting the vma context pointer to null in the mlx5_ib driver's
+ * private data, to protect a race condition in
+ * mlx5_ib_disassociate_ucontext().
+ */
+ mlx5_ib_vma_priv_data->vma = NULL;
+ list_del(&mlx5_ib_vma_priv_data->list);
+ kfree(mlx5_ib_vma_priv_data);
+}
+
+static const struct vm_operations_struct mlx5_ib_vm_ops = {
+ .open = mlx5_ib_vma_open,
+ .close = mlx5_ib_vma_close
+};
+
+static int mlx5_ib_set_vma_data(struct vm_area_struct *vma,
+ struct mlx5_ib_ucontext *ctx)
+{
+ struct mlx5_ib_vma_private_data *vma_prv;
+ struct list_head *vma_head = &ctx->vma_private_list;
+
+ vma_prv = kzalloc(sizeof(*vma_prv), GFP_KERNEL);
+ if (!vma_prv)
+ return -ENOMEM;
+
+ vma_prv->vma = vma;
+ vma->vm_private_data = vma_prv;
+ vma->vm_ops = &mlx5_ib_vm_ops;
+
+ list_add(&vma_prv->list, vma_head);
+
+ return 0;
+}
+
+static void mlx5_ib_disassociate_ucontext(struct ib_ucontext *ibcontext)
+{
+ int ret;
+ struct vm_area_struct *vma;
+ struct mlx5_ib_vma_private_data *vma_private, *n;
+ struct mlx5_ib_ucontext *context = to_mucontext(ibcontext);
+ struct task_struct *owning_process = NULL;
+ struct mm_struct *owning_mm = NULL;
+
+ owning_process = get_pid_task(ibcontext->tgid, PIDTYPE_PID);
+ if (!owning_process)
+ return;
+
+ owning_mm = get_task_mm(owning_process);
+ if (!owning_mm) {
+ pr_info("no mm, disassociate ucontext is pending task termination\n");
+ while (1) {
+ put_task_struct(owning_process);
+ usleep_range(1000, 2000);
+ owning_process = get_pid_task(ibcontext->tgid,
+ PIDTYPE_PID);
+ if (!owning_process ||
+ owning_process->state == TASK_DEAD) {
+ pr_info("disassociate ucontext done, task was terminated\n");
+ /* in case task was dead need to release the
+ * task struct.
+ */
+ if (owning_process)
+ put_task_struct(owning_process);
+ return;
+ }
+ }
+ }
+
+ /* need to protect from a race on closing the vma as part of
+ * mlx5_ib_vma_close.
+ */
+ down_read(&owning_mm->mmap_sem);
+ list_for_each_entry_safe(vma_private, n, &context->vma_private_list,
+ list) {
+ vma = vma_private->vma;
+ ret = zap_vma_ptes(vma, vma->vm_start,
+ PAGE_SIZE);
+ WARN_ONCE(ret, "%s: zap_vma_ptes failed", __func__);
+ /* context going to be destroyed, should
+ * not access ops any more.
+ */
+ vma->vm_ops = NULL;
+ list_del(&vma_private->list);
+ kfree(vma_private);
+ }
+ up_read(&owning_mm->mmap_sem);
+ mmput(owning_mm);
+ put_task_struct(owning_process);
+}
+
static inline char *mmap_cmd2str(enum mlx5_ib_mmap_cmd cmd)
{
switch (cmd) {
}
static int uar_mmap(struct mlx5_ib_dev *dev, enum mlx5_ib_mmap_cmd cmd,
- struct vm_area_struct *vma, struct mlx5_uuar_info *uuari)
+ struct vm_area_struct *vma,
+ struct mlx5_ib_ucontext *context)
{
+ struct mlx5_uuar_info *uuari = &context->uuari;
int err;
unsigned long idx;
phys_addr_t pfn, pa;
mlx5_ib_dbg(dev, "mapped %s at 0x%lx, PA %pa\n", mmap_cmd2str(cmd),
vma->vm_start, &pa);
- return 0;
+ return mlx5_ib_set_vma_data(vma, context);
}
static int mlx5_ib_mmap(struct ib_ucontext *ibcontext, struct vm_area_struct *vma)
{
struct mlx5_ib_ucontext *context = to_mucontext(ibcontext);
struct mlx5_ib_dev *dev = to_mdev(ibcontext->device);
- struct mlx5_uuar_info *uuari = &context->uuari;
unsigned long command;
phys_addr_t pfn;
case MLX5_IB_MMAP_WC_PAGE:
case MLX5_IB_MMAP_NC_PAGE:
case MLX5_IB_MMAP_REGULAR_PAGE:
- return uar_mmap(dev, command, vma, uuari);
+ return uar_mmap(dev, command, vma, context);
case MLX5_IB_MMAP_GET_CONTIGUOUS_PAGES:
return -ENOSYS;
dev->ib_dev.set_vf_guid = mlx5_ib_set_vf_guid;
}
+ dev->ib_dev.disassociate_ucontext = mlx5_ib_disassociate_ucontext;
+
mlx5_ib_internal_fill_odp_caps(dev);
if (MLX5_CAP_GEN(mdev, imaicl)) {
projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / commitdiff