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169 lines
4.1 KiB
169 lines
4.1 KiB
// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause |
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/* |
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* Copyright(c) 2016 Intel Corporation. |
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*/ |
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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 <rdma/uverbs_ioctl.h> |
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#include "mmap.h" |
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/** |
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* rvt_mmap_init - init link list and lock for mem map |
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* @rdi: rvt dev struct |
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*/ |
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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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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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* 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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* @vma: the VMA to be initialized |
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* |
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* Return: zero if the mmap is OK. Otherwise, return an errno. |
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*/ |
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int rvt_mmap(struct ib_ucontext *context, struct vm_area_struct *vma) |
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{ |
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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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* rvt_create_mmap_info - allocate information for hfi1_mmap |
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* @rdi: rvt dev struct |
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* @size: size in bytes to map |
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* @udata: user data (must be valid!) |
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* @obj: opaque pointer to a cq, wq etc |
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* |
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* Return: rvt_mmap struct on success, ERR_PTR on failure |
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*/ |
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struct rvt_mmap_info *rvt_create_mmap_info(struct rvt_dev_info *rdi, u32 size, |
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struct ib_udata *udata, void *obj) |
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{ |
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struct rvt_mmap_info *ip; |
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if (!udata) |
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return ERR_PTR(-EINVAL); |
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ip = kmalloc_node(sizeof(*ip), GFP_KERNEL, rdi->dparms.node); |
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if (!ip) |
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return ERR_PTR(-ENOMEM); |
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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 = ALIGN(PAGE_SIZE, SHMLBA); |
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ip->offset = rdi->mmap_offset; |
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rdi->mmap_offset += ALIGN(size, SHMLBA); |
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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 = |
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container_of(udata, struct uverbs_attr_bundle, driver_udata) |
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->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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/** |
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* rvt_update_mmap_info - update a mem map |
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* @rdi: rvt dev struct |
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* @ip: mmap info pointer |
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* @size: size to grow by |
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* @obj: opaque pointer to cq, wq, etc. |
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*/ |
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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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