mirror of
https://github.com/edk2-porting/linux-next.git
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1429d46df4
The grant mapping API does m2p_override unnecessarily: only gntdev needs it, for blkback and future netback patches it just cause a lock contention, as those pages never go to userspace. Therefore this series does the following: - the bulk of the original function (everything after the mapping hypercall) is moved to arch-dependent set/clear_foreign_p2m_mapping - the "if (xen_feature(XENFEAT_auto_translated_physmap))" branch goes to ARM - therefore the ARM function could be much smaller, the m2p_override stubs could be also removed - on x86 the set_phys_to_machine calls were moved up to this new funcion from m2p_override functions - and m2p_override functions are only called when there is a kmap_ops param It also removes a stray space from arch/x86/include/asm/xen/page.h. Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com> Suggested-by: Anthony Liguori <aliguori@amazon.com> Suggested-by: David Vrabel <david.vrabel@citrix.com> Suggested-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
242 lines
5.8 KiB
C
242 lines
5.8 KiB
C
#include <linux/bootmem.h>
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#include <linux/gfp.h>
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#include <linux/export.h>
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#include <linux/rwlock.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/dma-mapping.h>
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#include <linux/vmalloc.h>
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#include <linux/swiotlb.h>
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#include <xen/xen.h>
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#include <xen/interface/memory.h>
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#include <xen/swiotlb-xen.h>
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#include <asm/cacheflush.h>
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#include <asm/xen/page.h>
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#include <asm/xen/hypercall.h>
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#include <asm/xen/interface.h>
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struct xen_p2m_entry {
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unsigned long pfn;
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unsigned long mfn;
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unsigned long nr_pages;
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struct rb_node rbnode_mach;
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struct rb_node rbnode_phys;
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};
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static rwlock_t p2m_lock;
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struct rb_root phys_to_mach = RB_ROOT;
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EXPORT_SYMBOL_GPL(phys_to_mach);
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static struct rb_root mach_to_phys = RB_ROOT;
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static int xen_add_phys_to_mach_entry(struct xen_p2m_entry *new)
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{
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struct rb_node **link = &phys_to_mach.rb_node;
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struct rb_node *parent = NULL;
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struct xen_p2m_entry *entry;
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int rc = 0;
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while (*link) {
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parent = *link;
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entry = rb_entry(parent, struct xen_p2m_entry, rbnode_phys);
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if (new->mfn == entry->mfn)
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goto err_out;
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if (new->pfn == entry->pfn)
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goto err_out;
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if (new->pfn < entry->pfn)
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link = &(*link)->rb_left;
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else
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link = &(*link)->rb_right;
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}
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rb_link_node(&new->rbnode_phys, parent, link);
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rb_insert_color(&new->rbnode_phys, &phys_to_mach);
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goto out;
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err_out:
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rc = -EINVAL;
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pr_warn("%s: cannot add pfn=%pa -> mfn=%pa: pfn=%pa -> mfn=%pa already exists\n",
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__func__, &new->pfn, &new->mfn, &entry->pfn, &entry->mfn);
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out:
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return rc;
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}
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unsigned long __pfn_to_mfn(unsigned long pfn)
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{
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struct rb_node *n = phys_to_mach.rb_node;
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struct xen_p2m_entry *entry;
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unsigned long irqflags;
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read_lock_irqsave(&p2m_lock, irqflags);
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while (n) {
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entry = rb_entry(n, struct xen_p2m_entry, rbnode_phys);
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if (entry->pfn <= pfn &&
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entry->pfn + entry->nr_pages > pfn) {
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read_unlock_irqrestore(&p2m_lock, irqflags);
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return entry->mfn + (pfn - entry->pfn);
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}
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if (pfn < entry->pfn)
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n = n->rb_left;
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else
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n = n->rb_right;
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}
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read_unlock_irqrestore(&p2m_lock, irqflags);
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return INVALID_P2M_ENTRY;
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}
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EXPORT_SYMBOL_GPL(__pfn_to_mfn);
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static int xen_add_mach_to_phys_entry(struct xen_p2m_entry *new)
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{
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struct rb_node **link = &mach_to_phys.rb_node;
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struct rb_node *parent = NULL;
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struct xen_p2m_entry *entry;
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int rc = 0;
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while (*link) {
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parent = *link;
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entry = rb_entry(parent, struct xen_p2m_entry, rbnode_mach);
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if (new->mfn == entry->mfn)
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goto err_out;
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if (new->pfn == entry->pfn)
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goto err_out;
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if (new->mfn < entry->mfn)
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link = &(*link)->rb_left;
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else
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link = &(*link)->rb_right;
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}
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rb_link_node(&new->rbnode_mach, parent, link);
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rb_insert_color(&new->rbnode_mach, &mach_to_phys);
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goto out;
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err_out:
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rc = -EINVAL;
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pr_warn("%s: cannot add pfn=%pa -> mfn=%pa: pfn=%pa -> mfn=%pa already exists\n",
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__func__, &new->pfn, &new->mfn, &entry->pfn, &entry->mfn);
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out:
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return rc;
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}
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unsigned long __mfn_to_pfn(unsigned long mfn)
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{
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struct rb_node *n = mach_to_phys.rb_node;
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struct xen_p2m_entry *entry;
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unsigned long irqflags;
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read_lock_irqsave(&p2m_lock, irqflags);
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while (n) {
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entry = rb_entry(n, struct xen_p2m_entry, rbnode_mach);
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if (entry->mfn <= mfn &&
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entry->mfn + entry->nr_pages > mfn) {
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read_unlock_irqrestore(&p2m_lock, irqflags);
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return entry->pfn + (mfn - entry->mfn);
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}
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if (mfn < entry->mfn)
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n = n->rb_left;
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else
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n = n->rb_right;
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}
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read_unlock_irqrestore(&p2m_lock, irqflags);
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return INVALID_P2M_ENTRY;
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}
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EXPORT_SYMBOL_GPL(__mfn_to_pfn);
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int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
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struct gnttab_map_grant_ref *kmap_ops,
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struct page **pages, unsigned int count)
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{
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int i;
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for (i = 0; i < count; i++) {
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if (map_ops[i].status)
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continue;
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set_phys_to_machine(map_ops[i].host_addr >> PAGE_SHIFT,
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map_ops[i].dev_bus_addr >> PAGE_SHIFT);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(set_foreign_p2m_mapping);
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int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
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struct gnttab_map_grant_ref *kmap_ops,
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struct page **pages, unsigned int count)
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{
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int i;
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for (i = 0; i < count; i++) {
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set_phys_to_machine(unmap_ops[i].host_addr >> PAGE_SHIFT,
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INVALID_P2M_ENTRY);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(clear_foreign_p2m_mapping);
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bool __set_phys_to_machine_multi(unsigned long pfn,
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unsigned long mfn, unsigned long nr_pages)
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{
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int rc;
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unsigned long irqflags;
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struct xen_p2m_entry *p2m_entry;
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struct rb_node *n = phys_to_mach.rb_node;
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if (mfn == INVALID_P2M_ENTRY) {
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write_lock_irqsave(&p2m_lock, irqflags);
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while (n) {
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p2m_entry = rb_entry(n, struct xen_p2m_entry, rbnode_phys);
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if (p2m_entry->pfn <= pfn &&
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p2m_entry->pfn + p2m_entry->nr_pages > pfn) {
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rb_erase(&p2m_entry->rbnode_mach, &mach_to_phys);
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rb_erase(&p2m_entry->rbnode_phys, &phys_to_mach);
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write_unlock_irqrestore(&p2m_lock, irqflags);
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kfree(p2m_entry);
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return true;
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}
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if (pfn < p2m_entry->pfn)
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n = n->rb_left;
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else
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n = n->rb_right;
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}
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write_unlock_irqrestore(&p2m_lock, irqflags);
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return true;
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}
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p2m_entry = kzalloc(sizeof(struct xen_p2m_entry), GFP_NOWAIT);
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if (!p2m_entry) {
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pr_warn("cannot allocate xen_p2m_entry\n");
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return false;
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}
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p2m_entry->pfn = pfn;
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p2m_entry->nr_pages = nr_pages;
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p2m_entry->mfn = mfn;
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write_lock_irqsave(&p2m_lock, irqflags);
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if ((rc = xen_add_phys_to_mach_entry(p2m_entry) < 0) ||
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(rc = xen_add_mach_to_phys_entry(p2m_entry) < 0)) {
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write_unlock_irqrestore(&p2m_lock, irqflags);
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return false;
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}
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write_unlock_irqrestore(&p2m_lock, irqflags);
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return true;
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}
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EXPORT_SYMBOL_GPL(__set_phys_to_machine_multi);
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bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn)
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{
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return __set_phys_to_machine_multi(pfn, mfn, 1);
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}
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EXPORT_SYMBOL_GPL(__set_phys_to_machine);
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static int p2m_init(void)
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{
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rwlock_init(&p2m_lock);
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return 0;
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}
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arch_initcall(p2m_init);
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