Introduce a new pmap function, pmap_extract_and_hold(). This function
atomically extracts and holds the physical page that is associated with the given pmap and virtual address. Such a function is needed to make the memory mapping optimizations used by, for example, pipes and raw disk I/O MP-safe. Reviewed by: tegge
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=119869
@ -811,6 +811,29 @@ pmap_extract(pmap, va)
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return 0;
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}
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/*
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* Routine: pmap_extract_and_hold
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* Function:
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* Atomically extract and hold the physical page
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* with the given pmap and virtual address.
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*/
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vm_page_t
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pmap_extract_and_hold(pmap_t pmap, vm_offset_t va)
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{
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vm_paddr_t pa;
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vm_page_t m;
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m = NULL;
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mtx_lock(&Giant);
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if ((pa = pmap_extract(pmap, va)) != 0) {
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m = PHYS_TO_VM_PAGE(pa);
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vm_page_lock_queues();
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vm_page_hold(m);
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vm_page_unlock_queues();
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}
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mtx_unlock(&Giant);
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return (m);
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}
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/***************************************************
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* Low level mapping routines.....
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@ -749,6 +749,30 @@ pmap_extract(pmap, va)
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}
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/*
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* Routine: pmap_extract_and_hold
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* Function:
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* Atomically extract and hold the physical page
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* with the given pmap and virtual address.
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*/
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vm_page_t
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pmap_extract_and_hold(pmap_t pmap, vm_offset_t va)
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{
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vm_paddr_t pa;
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vm_page_t m;
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m = NULL;
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mtx_lock(&Giant);
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if ((pa = pmap_extract(pmap, va)) != 0) {
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m = PHYS_TO_VM_PAGE(pa);
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vm_page_lock_queues();
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vm_page_hold(m);
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vm_page_unlock_queues();
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}
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mtx_unlock(&Giant);
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return (m);
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}
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vm_paddr_t
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pmap_kextract(vm_offset_t va)
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{
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@ -861,6 +861,30 @@ pmap_extract(pmap, va)
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}
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/*
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* Routine: pmap_extract_and_hold
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* Function:
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* Atomically extract and hold the physical page
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* with the given pmap and virtual address.
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*/
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vm_page_t
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pmap_extract_and_hold(pmap_t pmap, vm_offset_t va)
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{
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vm_paddr_t pa;
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vm_page_t m;
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m = NULL;
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mtx_lock(&Giant);
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if ((pa = pmap_extract(pmap, va)) != 0) {
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m = PHYS_TO_VM_PAGE(pa);
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vm_page_lock_queues();
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vm_page_hold(m);
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vm_page_unlock_queues();
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}
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mtx_unlock(&Giant);
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return (m);
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}
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/***************************************************
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* Low level mapping routines.....
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***************************************************/
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@ -1102,6 +1102,30 @@ pmap_extract(pmap, va)
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return pmap_pte_pa(pte);
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}
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/*
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* Routine: pmap_extract_and_hold
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* Function:
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* Atomically extract and hold the physical page
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* with the given pmap and virtual address.
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*/
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vm_page_t
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pmap_extract_and_hold(pmap_t pmap, vm_offset_t va)
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{
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vm_paddr_t pa;
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vm_page_t m;
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m = NULL;
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mtx_lock(&Giant);
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if ((pa = pmap_extract(pmap, va)) != 0) {
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m = PHYS_TO_VM_PAGE(pa);
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vm_page_lock_queues();
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vm_page_hold(m);
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vm_page_unlock_queues();
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}
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mtx_unlock(&Giant);
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return (m);
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}
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/***************************************************
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* Low level mapping routines.....
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***************************************************/
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@ -620,6 +620,28 @@ pmap_extract(pmap_t pm, vm_offset_t va)
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return (TTE_GET_PA(tp) | (va & TTE_GET_PAGE_MASK(tp)));
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}
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/*
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* Atomically extract and hold the physical page with the given
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* pmap and virtual address pair.
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*/
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vm_page_t
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pmap_extract_and_hold(pmap_t pmap, vm_offset_t va)
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{
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vm_paddr_t pa;
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vm_page_t m;
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m = NULL;
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mtx_lock(&Giant);
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if ((pa = pmap_extract(pmap, va)) != 0) {
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m = PHYS_TO_VM_PAGE(pa);
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vm_page_lock_queues();
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vm_page_hold(m);
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vm_page_unlock_queues();
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}
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mtx_unlock(&Giant);
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return (m);
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}
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/*
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* Extract the physical page address associated with the given kernel virtual
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* address.
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@ -106,6 +106,7 @@ void pmap_enter(pmap_t, vm_offset_t, vm_page_t, vm_prot_t,
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vm_page_t pmap_enter_quick(pmap_t pmap, vm_offset_t va, vm_page_t m,
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vm_page_t mpte);
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vm_paddr_t pmap_extract(pmap_t pmap, vm_offset_t va);
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vm_page_t pmap_extract_and_hold(pmap_t pmap, vm_offset_t va);
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void pmap_growkernel(vm_offset_t);
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void pmap_init(vm_paddr_t, vm_paddr_t);
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boolean_t pmap_is_modified(vm_page_t m);
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