diff options
author | Dennis Dalessandro <dennis.dalessandro@intel.com> | 2016-01-06 10:04:57 -0800 |
---|---|---|
committer | Doug Ledford <dledford@redhat.com> | 2016-03-10 20:37:15 -0500 |
commit | 822514d75a9647662fff39d728c1f4636b75d904 (patch) | |
tree | b501a4acfe567e77a9ea3a4471708f7bed8f4af2 /drivers | |
parent | 0acb0cc7ecc1e4860b056368566c0c2c254ae281 (diff) | |
download | linux-822514d75a9647662fff39d728c1f4636b75d904.tar.bz2 |
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>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/infiniband/sw/rdmavt/mmap.c | 140 | ||||
-rw-r--r-- | drivers/infiniband/sw/rdmavt/mmap.h | 2 | ||||
-rw-r--r-- | drivers/infiniband/sw/rdmavt/vt.c | 1 |
3 files changed, 141 insertions, 2 deletions
diff --git a/drivers/infiniband/sw/rdmavt/mmap.c b/drivers/infiniband/sw/rdmavt/mmap.c index d09f3a05a747..fc30ff7f24ea 100644 --- a/drivers/infiniband/sw/rdmavt/mmap.c +++ b/drivers/infiniband/sw/rdmavt/mmap.c @@ -46,8 +46,61 @@ */ #include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/mm.h> +#include <asm/pgtable.h> #include "mmap.h" +void rvt_mmap_init(struct rvt_dev_info *rdi) +{ + INIT_LIST_HEAD(&rdi->pending_mmaps); + spin_lock_init(&rdi->pending_lock); + rdi->mmap_offset = PAGE_SIZE; + spin_lock_init(&rdi->mmap_offset_lock); +} + +/** + * rvt_release_mmap_info - free mmap info structure + * @ref: a pointer to the kref within struct rvt_mmap_info + */ +void rvt_release_mmap_info(struct kref *ref) +{ + struct rvt_mmap_info *ip = + container_of(ref, struct rvt_mmap_info, ref); + struct rvt_dev_info *rdi = ib_to_rvt(ip->context->device); + + spin_lock_irq(&rdi->pending_lock); + list_del(&ip->pending_mmaps); + spin_unlock_irq(&rdi->pending_lock); + + vfree(ip->obj); + kfree(ip); +} +EXPORT_SYMBOL(rvt_release_mmap_info); + +/* + * open and close keep track of how many times the CQ is mapped, + * to avoid releasing it. + */ +static void rvt_vma_open(struct vm_area_struct *vma) +{ + struct rvt_mmap_info *ip = vma->vm_private_data; + + kref_get(&ip->ref); +} + +static void rvt_vma_close(struct vm_area_struct *vma) +{ + struct rvt_mmap_info *ip = vma->vm_private_data; + + kref_put(&ip->ref, rvt_release_mmap_info); +} + +static const struct vm_operations_struct rvt_vm_ops = { + .open = rvt_vma_open, + .close = rvt_vma_close, +}; + /** * rvt_mmap - create a new mmap region * @context: the IB user context of the process making the mmap() call @@ -56,5 +109,90 @@ */ int rvt_mmap(struct ib_ucontext *context, struct vm_area_struct *vma) { - return -EOPNOTSUPP; + struct rvt_dev_info *rdi = ib_to_rvt(context->device); + unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; + unsigned long size = vma->vm_end - vma->vm_start; + struct rvt_mmap_info *ip, *pp; + int ret = -EINVAL; + + /* + * Search the device's list of objects waiting for a mmap call. + * Normally, this list is very short since a call to create a + * CQ, QP, or SRQ is soon followed by a call to mmap(). + */ + spin_lock_irq(&rdi->pending_lock); + list_for_each_entry_safe(ip, pp, &rdi->pending_mmaps, + pending_mmaps) { + /* Only the creator is allowed to mmap the object */ + if (context != ip->context || (__u64)offset != ip->offset) + continue; + /* Don't allow a mmap larger than the object. */ + if (size > ip->size) + break; + + list_del_init(&ip->pending_mmaps); + spin_unlock_irq(&rdi->pending_lock); + + ret = remap_vmalloc_range(vma, ip->obj, 0); + if (ret) + goto done; + vma->vm_ops = &rvt_vm_ops; + vma->vm_private_data = ip; + rvt_vma_open(vma); + goto done; + } + spin_unlock_irq(&rdi->pending_lock); +done: + return ret; +} +EXPORT_SYMBOL(rvt_mmap); + +/* + * Allocate information for hfi1_mmap + */ +struct rvt_mmap_info *rvt_create_mmap_info(struct rvt_dev_info *rdi, + u32 size, + struct ib_ucontext *context, + void *obj) +{ + struct rvt_mmap_info *ip; + + ip = kmalloc(sizeof(*ip), GFP_KERNEL); + if (!ip) + return ip; + + size = PAGE_ALIGN(size); + + spin_lock_irq(&rdi->mmap_offset_lock); + if (rdi->mmap_offset == 0) + rdi->mmap_offset = PAGE_SIZE; + ip->offset = rdi->mmap_offset; + rdi->mmap_offset += size; + spin_unlock_irq(&rdi->mmap_offset_lock); + + INIT_LIST_HEAD(&ip->pending_mmaps); + ip->size = size; + ip->context = context; + ip->obj = obj; + kref_init(&ip->ref); + + return ip; +} +EXPORT_SYMBOL(rvt_create_mmap_info); + +void rvt_update_mmap_info(struct rvt_dev_info *rdi, struct rvt_mmap_info *ip, + u32 size, void *obj) +{ + size = PAGE_ALIGN(size); + + spin_lock_irq(&rdi->mmap_offset_lock); + if (rdi->mmap_offset == 0) + rdi->mmap_offset = PAGE_SIZE; + ip->offset = rdi->mmap_offset; + rdi->mmap_offset += size; + spin_unlock_irq(&rdi->mmap_offset_lock); + + ip->size = size; + ip->obj = obj; } +EXPORT_SYMBOL(rvt_update_mmap_info); diff --git a/drivers/infiniband/sw/rdmavt/mmap.h b/drivers/infiniband/sw/rdmavt/mmap.h index 94f6377cef3c..3513e25a8491 100644 --- a/drivers/infiniband/sw/rdmavt/mmap.h +++ b/drivers/infiniband/sw/rdmavt/mmap.h @@ -50,6 +50,6 @@ #include <rdma/rdma_vt.h> -int rvt_mmap(struct ib_ucontext *context, struct vm_area_struct *vma); +void rvt_mmap_init(struct rvt_dev_info *rdi); #endif /* DEF_RDMAVTMMAP_H */ diff --git a/drivers/infiniband/sw/rdmavt/vt.c b/drivers/infiniband/sw/rdmavt/vt.c index f2d995d2f62c..ab4105a8d120 100644 --- a/drivers/infiniband/sw/rdmavt/vt.c +++ b/drivers/infiniband/sw/rdmavt/vt.c @@ -241,6 +241,7 @@ int rvt_register_device(struct rvt_dev_info *rdi) } /* Once we get past here we can use the rvt_pr macros */ + rvt_mmap_init(rdi); /* Dev Ops */ CHECK_DRIVER_OVERRIDE(rdi, query_device); |