Commit 822514d7 authored by Dennis Dalessandro's avatar Dennis Dalessandro Committed by Doug Ledford

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: default avatarIra Weiny <ira.weiny@intel.com>
Reviewed-by: default avatarMike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: default avatarDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent 0acb0cc7
......@@ -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);
......@@ -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 */
......@@ -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);
......
......@@ -254,6 +254,12 @@ struct rvt_dev_info {
struct rvt_ibport **ports;
struct rvt_qp_ibdev *qp_dev;
/* memory maps */
struct list_head pending_mmaps;
spinlock_t mmap_offset_lock; /* protect mmap_offset */
u32 mmap_offset;
spinlock_t pending_lock; /* protect pending mmap list */
};
static inline struct rvt_pd *ibpd_to_rvtpd(struct ib_pd *ibpd)
......@@ -285,4 +291,13 @@ int rvt_rkey_ok(struct rvt_qp *qp, struct rvt_sge *sge,
u32 len, u64 vaddr, u32 rkey, int acc);
int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd,
struct rvt_sge *isge, struct ib_sge *sge, int acc);
int rvt_mmap(struct ib_ucontext *context, struct vm_area_struct *vma);
void rvt_release_mmap_info(struct kref *ref);
struct rvt_mmap_info *rvt_create_mmap_info(struct rvt_dev_info *rdi,
u32 size,
struct ib_ucontext *context,
void *obj);
void rvt_update_mmap_info(struct rvt_dev_info *rdi, struct rvt_mmap_info *ip,
u32 size, void *obj);
#endif /* DEF_RDMA_VT_H */
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