IB/rdmavt: Add mmap related functions
The mmap data structure was moved in a previous commit. This patch now pulls in the related functions. Reviewed-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
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@ -46,8 +46,61 @@
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*/
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*/
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#include <linux/slab.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include <asm/pgtable.h>
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#include "mmap.h"
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#include "mmap.h"
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void rvt_mmap_init(struct rvt_dev_info *rdi)
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{
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INIT_LIST_HEAD(&rdi->pending_mmaps);
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spin_lock_init(&rdi->pending_lock);
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rdi->mmap_offset = PAGE_SIZE;
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spin_lock_init(&rdi->mmap_offset_lock);
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}
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/**
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* rvt_release_mmap_info - free mmap info structure
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* @ref: a pointer to the kref within struct rvt_mmap_info
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*/
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void rvt_release_mmap_info(struct kref *ref)
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{
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struct rvt_mmap_info *ip =
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container_of(ref, struct rvt_mmap_info, ref);
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struct rvt_dev_info *rdi = ib_to_rvt(ip->context->device);
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spin_lock_irq(&rdi->pending_lock);
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list_del(&ip->pending_mmaps);
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spin_unlock_irq(&rdi->pending_lock);
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vfree(ip->obj);
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kfree(ip);
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}
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EXPORT_SYMBOL(rvt_release_mmap_info);
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/*
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* open and close keep track of how many times the CQ is mapped,
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* to avoid releasing it.
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*/
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static void rvt_vma_open(struct vm_area_struct *vma)
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{
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struct rvt_mmap_info *ip = vma->vm_private_data;
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kref_get(&ip->ref);
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}
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static void rvt_vma_close(struct vm_area_struct *vma)
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{
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struct rvt_mmap_info *ip = vma->vm_private_data;
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kref_put(&ip->ref, rvt_release_mmap_info);
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}
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static const struct vm_operations_struct rvt_vm_ops = {
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.open = rvt_vma_open,
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.close = rvt_vma_close,
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};
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/**
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/**
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* rvt_mmap - create a new mmap region
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* rvt_mmap - create a new mmap region
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* @context: the IB user context of the process making the mmap() call
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* @context: the IB user context of the process making the mmap() call
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@ -56,5 +109,90 @@
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*/
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*/
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int rvt_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
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int rvt_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
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{
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{
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return -EOPNOTSUPP;
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struct rvt_dev_info *rdi = ib_to_rvt(context->device);
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unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
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unsigned long size = vma->vm_end - vma->vm_start;
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struct rvt_mmap_info *ip, *pp;
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int ret = -EINVAL;
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/*
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* Search the device's list of objects waiting for a mmap call.
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* Normally, this list is very short since a call to create a
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* CQ, QP, or SRQ is soon followed by a call to mmap().
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*/
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spin_lock_irq(&rdi->pending_lock);
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list_for_each_entry_safe(ip, pp, &rdi->pending_mmaps,
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pending_mmaps) {
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/* Only the creator is allowed to mmap the object */
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if (context != ip->context || (__u64)offset != ip->offset)
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continue;
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/* Don't allow a mmap larger than the object. */
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if (size > ip->size)
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break;
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list_del_init(&ip->pending_mmaps);
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spin_unlock_irq(&rdi->pending_lock);
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ret = remap_vmalloc_range(vma, ip->obj, 0);
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if (ret)
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goto done;
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vma->vm_ops = &rvt_vm_ops;
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vma->vm_private_data = ip;
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rvt_vma_open(vma);
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goto done;
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}
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spin_unlock_irq(&rdi->pending_lock);
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done:
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return ret;
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}
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}
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EXPORT_SYMBOL(rvt_mmap);
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/*
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* Allocate information for hfi1_mmap
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*/
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struct rvt_mmap_info *rvt_create_mmap_info(struct rvt_dev_info *rdi,
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u32 size,
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struct ib_ucontext *context,
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void *obj)
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{
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struct rvt_mmap_info *ip;
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ip = kmalloc(sizeof(*ip), GFP_KERNEL);
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if (!ip)
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return ip;
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size = PAGE_ALIGN(size);
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spin_lock_irq(&rdi->mmap_offset_lock);
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if (rdi->mmap_offset == 0)
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rdi->mmap_offset = PAGE_SIZE;
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ip->offset = rdi->mmap_offset;
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rdi->mmap_offset += size;
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spin_unlock_irq(&rdi->mmap_offset_lock);
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INIT_LIST_HEAD(&ip->pending_mmaps);
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ip->size = size;
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ip->context = context;
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ip->obj = obj;
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kref_init(&ip->ref);
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return ip;
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}
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EXPORT_SYMBOL(rvt_create_mmap_info);
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void rvt_update_mmap_info(struct rvt_dev_info *rdi, struct rvt_mmap_info *ip,
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u32 size, void *obj)
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{
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size = PAGE_ALIGN(size);
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spin_lock_irq(&rdi->mmap_offset_lock);
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if (rdi->mmap_offset == 0)
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rdi->mmap_offset = PAGE_SIZE;
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ip->offset = rdi->mmap_offset;
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rdi->mmap_offset += size;
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spin_unlock_irq(&rdi->mmap_offset_lock);
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ip->size = size;
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ip->obj = obj;
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}
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EXPORT_SYMBOL(rvt_update_mmap_info);
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@ -50,6 +50,6 @@
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#include <rdma/rdma_vt.h>
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#include <rdma/rdma_vt.h>
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int rvt_mmap(struct ib_ucontext *context, struct vm_area_struct *vma);
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void rvt_mmap_init(struct rvt_dev_info *rdi);
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#endif /* DEF_RDMAVTMMAP_H */
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#endif /* DEF_RDMAVTMMAP_H */
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@ -241,6 +241,7 @@ int rvt_register_device(struct rvt_dev_info *rdi)
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}
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}
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/* Once we get past here we can use the rvt_pr macros */
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/* Once we get past here we can use the rvt_pr macros */
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rvt_mmap_init(rdi);
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/* Dev Ops */
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/* Dev Ops */
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CHECK_DRIVER_OVERRIDE(rdi, query_device);
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CHECK_DRIVER_OVERRIDE(rdi, query_device);
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@ -254,6 +254,12 @@ struct rvt_dev_info {
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struct rvt_ibport **ports;
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struct rvt_ibport **ports;
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struct rvt_qp_ibdev *qp_dev;
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struct rvt_qp_ibdev *qp_dev;
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/* memory maps */
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struct list_head pending_mmaps;
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spinlock_t mmap_offset_lock; /* protect mmap_offset */
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u32 mmap_offset;
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spinlock_t pending_lock; /* protect pending mmap list */
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};
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};
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static inline struct rvt_pd *ibpd_to_rvtpd(struct ib_pd *ibpd)
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static inline struct rvt_pd *ibpd_to_rvtpd(struct ib_pd *ibpd)
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@ -285,4 +291,13 @@ int rvt_rkey_ok(struct rvt_qp *qp, struct rvt_sge *sge,
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u32 len, u64 vaddr, u32 rkey, int acc);
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u32 len, u64 vaddr, u32 rkey, int acc);
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int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd,
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int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd,
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struct rvt_sge *isge, struct ib_sge *sge, int acc);
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struct rvt_sge *isge, struct ib_sge *sge, int acc);
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int rvt_mmap(struct ib_ucontext *context, struct vm_area_struct *vma);
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void rvt_release_mmap_info(struct kref *ref);
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struct rvt_mmap_info *rvt_create_mmap_info(struct rvt_dev_info *rdi,
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u32 size,
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struct ib_ucontext *context,
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void *obj);
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void rvt_update_mmap_info(struct rvt_dev_info *rdi, struct rvt_mmap_info *ip,
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u32 size, void *obj);
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#endif /* DEF_RDMA_VT_H */
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#endif /* DEF_RDMA_VT_H */
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