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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen staging] grant_table: use term 'mfn' for machine frame numbers...
commit 4f4fc5f6afdeb6d2da81c391408eabbc3d741996
Author: Paul Durrant <paul.durrant@xxxxxxxxxx>
AuthorDate: Wed Jul 18 10:39:23 2018 +0200
Commit: Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Jul 18 10:39:23 2018 +0200
grant_table: use term 'mfn' for machine frame numbers...
...rather than more ambiguous term 'frame'.
There are many places in the grant table code that use a variable or
field name '.*frame' to refer to a quantity that is strictly an MFN, and
even has type mfn_t.
This patch is a purely cosmetic patch that substitutes 'frame' with 'mfn'
in those places to make the purpose of the variable or field name more
obvious.
Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
Reviewed-by: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
---
xen/common/grant_table.c | 142 ++++++++++++++++++++++++-----------------------
1 file changed, 72 insertions(+), 70 deletions(-)
diff --git a/xen/common/grant_table.c b/xen/common/grant_table.c
index 51e1f5ca4c..d2610e320c 100644
--- a/xen/common/grant_table.c
+++ b/xen/common/grant_table.c
@@ -167,7 +167,7 @@ struct gnttab_unmap_common {
/* Shared state beteen *_unmap and *_unmap_complete */
uint16_t done;
- mfn_t frame;
+ mfn_t mfn;
struct domain *rd;
grant_ref_t ref;
};
@@ -266,7 +266,7 @@ struct active_grant_entry {
grant. */
grant_ref_t trans_gref;
struct domain *trans_domain;
- mfn_t frame; /* Frame being granted. */
+ mfn_t mfn; /* Machine frame being granted. */
#ifndef NDEBUG
gfn_t gfn; /* Guest's idea of the frame being granted. */
#endif
@@ -370,15 +370,15 @@ static inline unsigned int
grant_to_status_frames(unsigned int grant_frames)
/* Check if the page has been paged out, or needs unsharing.
If rc == GNTST_okay, *page contains the page struct with a ref taken.
Caller must do put_page(*page).
- If any error, *page = NULL, *frame = INVALID_MFN, no ref taken. */
-static int get_paged_frame(unsigned long gfn, mfn_t *frame,
+ If any error, *page = NULL, *mfn = INVALID_MFN, no ref taken. */
+static int get_paged_frame(unsigned long gfn, mfn_t *mfn,
struct page_info **page, bool readonly,
struct domain *rd)
{
int rc = GNTST_okay;
p2m_type_t p2mt;
- *frame = INVALID_MFN;
+ *mfn = INVALID_MFN;
*page = get_page_from_gfn(rd, gfn, &p2mt,
readonly ? P2M_ALLOC : P2M_UNSHARE);
if ( !*page )
@@ -405,7 +405,7 @@ static int get_paged_frame(unsigned long gfn, mfn_t *frame,
return GNTST_bad_page;
}
- *frame = page_to_mfn(*page);
+ *mfn = page_to_mfn(*page);
return rc;
}
@@ -843,7 +843,7 @@ static struct active_grant_entry *grant_map_exists(const
struct domain *ld,
struct active_grant_entry *act = active_entry_acquire(rgt, ref);
if ( act->pin && act->domid == ld->domain_id &&
- mfn_eq(act->frame, mfn) )
+ mfn_eq(act->mfn, mfn) )
return act;
active_entry_release(act);
}
@@ -885,7 +885,7 @@ static unsigned int mapkind(
if ( !(map->flags & (GNTMAP_device_map|GNTMAP_host_map)) ||
map->domid != rd->domain_id )
continue;
- if ( mfn_eq(_active_entry(rd->grant_table, map->ref).frame, mfn) )
+ if ( mfn_eq(_active_entry(rd->grant_table, map->ref).mfn, mfn) )
kind |= map->flags & GNTMAP_readonly ?
MAPKIND_READ : MAPKIND_WRITE;
}
@@ -908,7 +908,7 @@ map_grant_ref(
struct grant_table *lgt, *rgt;
struct vcpu *led;
grant_handle_t handle;
- mfn_t frame;
+ mfn_t mfn;
struct page_info *pg = NULL;
int rc = GNTST_okay;
u32 old_pin;
@@ -1001,13 +1001,13 @@ map_grant_ref(
shared_entry_v1(rgt, op->ref).frame :
shared_entry_v2(rgt, op->ref).full_page.frame;
- rc = get_paged_frame(gfn, &frame, &pg,
+ rc = get_paged_frame(gfn, &mfn, &pg,
op->flags & GNTMAP_readonly, rd);
if ( rc != GNTST_okay )
goto unlock_out_clear;
act_set_gfn(act, _gfn(gfn));
act->domid = ld->domain_id;
- act->frame = frame;
+ act->mfn = mfn;
act->start = 0;
act->length = PAGE_SIZE;
act->is_sub_page = false;
@@ -1024,7 +1024,7 @@ map_grant_ref(
act->pin += (op->flags & GNTMAP_readonly) ?
GNTPIN_hstr_inc : GNTPIN_hstw_inc;
- frame = act->frame;
+ mfn = act->mfn;
act_pin = act->pin;
cache_flags = (shah->flags & (GTF_PAT | GTF_PWT | GTF_PCD) );
@@ -1035,7 +1035,7 @@ map_grant_ref(
/* pg may be set, with a refcount included, from get_paged_frame(). */
if ( !pg )
{
- pg = mfn_valid(frame) ? mfn_to_page(frame) : NULL;
+ pg = mfn_valid(mfn) ? mfn_to_page(mfn) : NULL;
if ( pg )
owner = page_get_owner_and_reference(pg);
}
@@ -1061,18 +1061,18 @@ map_grant_ref(
goto undo_out;
}
- if ( !iomem_access_permitted(rd, mfn_x(frame), mfn_x(frame)) )
+ if ( !iomem_access_permitted(rd, mfn_x(mfn), mfn_x(mfn)) )
{
gdprintk(XENLOG_WARNING,
"Iomem mapping not permitted %#"PRI_mfn" (domain %d)\n",
- mfn_x(frame), rd->domain_id);
+ mfn_x(mfn), rd->domain_id);
rc = GNTST_general_error;
goto undo_out;
}
if ( op->flags & GNTMAP_host_map )
{
- rc = create_grant_host_mapping(op->host_addr, frame, op->flags,
+ rc = create_grant_host_mapping(op->host_addr, mfn, op->flags,
cache_flags);
if ( rc != GNTST_okay )
goto undo_out;
@@ -1112,7 +1112,7 @@ map_grant_ref(
typecnt++;
}
- rc = create_grant_host_mapping(op->host_addr, frame, op->flags, 0);
+ rc = create_grant_host_mapping(op->host_addr, mfn, op->flags, 0);
if ( rc != GNTST_okay )
goto undo_out;
@@ -1124,7 +1124,7 @@ map_grant_ref(
could_not_pin:
if ( !rd->is_dying )
gdprintk(XENLOG_WARNING, "Could not pin grant frame %#"PRI_mfn"\n",
- mfn_x(frame));
+ mfn_x(mfn));
rc = GNTST_general_error;
goto undo_out;
}
@@ -1139,18 +1139,18 @@ map_grant_ref(
/* We're not translated, so we know that gmfns and mfns are
the same things, so the IOMMU entry is always 1-to-1. */
- kind = mapkind(lgt, rd, frame);
+ kind = mapkind(lgt, rd, mfn);
if ( (act_pin & (GNTPIN_hstw_mask|GNTPIN_devw_mask)) &&
!(old_pin & (GNTPIN_hstw_mask|GNTPIN_devw_mask)) )
{
if ( !(kind & MAPKIND_WRITE) )
- err = iommu_map_page(ld, mfn_x(frame), mfn_x(frame),
+ err = iommu_map_page(ld, mfn_x(mfn), mfn_x(mfn),
IOMMUF_readable|IOMMUF_writable);
}
else if ( act_pin && !old_pin )
{
if ( !kind )
- err = iommu_map_page(ld, mfn_x(frame), mfn_x(frame),
+ err = iommu_map_page(ld, mfn_x(mfn), mfn_x(mfn),
IOMMUF_readable);
}
if ( err )
@@ -1180,7 +1180,7 @@ map_grant_ref(
if ( need_iommu )
double_gt_unlock(lgt, rgt);
- op->dev_bus_addr = mfn_to_maddr(frame);
+ op->dev_bus_addr = mfn_to_maddr(mfn);
op->handle = handle;
op->status = GNTST_okay;
@@ -1190,7 +1190,7 @@ map_grant_ref(
undo_out:
if ( host_map_created )
{
- replace_grant_host_mapping(op->host_addr, frame, 0, op->flags);
+ replace_grant_host_mapping(op->host_addr, mfn, 0, op->flags);
gnttab_flush_tlb(ld);
}
@@ -1365,18 +1365,18 @@ unmap_common(
goto act_release_out;
}
- op->frame = act->frame;
+ op->mfn = act->mfn;
if ( op->dev_bus_addr &&
- unlikely(op->dev_bus_addr != mfn_to_maddr(act->frame)) )
+ unlikely(op->dev_bus_addr != mfn_to_maddr(act->mfn)) )
PIN_FAIL(act_release_out, GNTST_general_error,
"Bus address doesn't match gntref (%"PRIx64" !=
%"PRIpaddr")\n",
- op->dev_bus_addr, mfn_to_maddr(act->frame));
+ op->dev_bus_addr, mfn_to_maddr(act->mfn));
if ( op->host_addr && (flags & GNTMAP_host_map) )
{
if ( (rc = replace_grant_host_mapping(op->host_addr,
- op->frame, op->new_addr,
+ op->mfn, op->new_addr,
flags)) < 0 )
goto act_release_out;
@@ -1411,12 +1411,12 @@ unmap_common(
double_gt_lock(lgt, rgt);
- kind = mapkind(lgt, rd, op->frame);
+ kind = mapkind(lgt, rd, op->mfn);
if ( !kind )
- err = iommu_unmap_page(ld, mfn_x(op->frame));
+ err = iommu_unmap_page(ld, mfn_x(op->mfn));
else if ( !(kind & MAPKIND_WRITE) )
- err = iommu_map_page(ld, mfn_x(op->frame),
- mfn_x(op->frame), IOMMUF_readable);
+ err = iommu_map_page(ld, mfn_x(op->mfn),
+ mfn_x(op->mfn), IOMMUF_readable);
double_gt_unlock(lgt, rgt);
@@ -1426,7 +1426,7 @@ unmap_common(
/* If just unmapped a writable mapping, mark as dirtied */
if ( rc == GNTST_okay && !(flags & GNTMAP_readonly) )
- gnttab_mark_dirty(rd, op->frame);
+ gnttab_mark_dirty(rd, op->mfn);
op->status = rc;
rcu_unlock_domain(rd);
@@ -1463,11 +1463,11 @@ unmap_common_complete(struct gnttab_unmap_common *op)
else
status = &status_entry(rgt, op->ref);
- pg = mfn_to_page(op->frame);
+ pg = mfn_to_page(op->mfn);
if ( op->done & GNTMAP_device_map )
{
- if ( !is_iomem_page(act->frame) )
+ if ( !is_iomem_page(act->mfn) )
{
if ( op->done & GNTMAP_readonly )
put_page(pg);
@@ -1484,7 +1484,7 @@ unmap_common_complete(struct gnttab_unmap_common *op)
if ( op->done & GNTMAP_host_map )
{
- if ( !is_iomem_page(op->frame) )
+ if ( !is_iomem_page(op->mfn) )
{
if ( gnttab_host_mapping_get_page_type(op->done & GNTMAP_readonly,
ld, rd) )
@@ -1525,7 +1525,7 @@ unmap_grant_ref(
common->done = 0;
common->new_addr = 0;
common->rd = NULL;
- common->frame = INVALID_MFN;
+ common->mfn = INVALID_MFN;
unmap_common(common);
op->status = common->status;
@@ -1591,7 +1591,7 @@ unmap_and_replace(
common->done = 0;
common->dev_bus_addr = 0;
common->rd = NULL;
- common->frame = INVALID_MFN;
+ common->mfn = INVALID_MFN;
unmap_common(common);
op->status = common->status;
@@ -2320,7 +2320,7 @@ release_grant_for_copy(
struct grant_table *rgt = rd->grant_table;
grant_entry_header_t *sha;
struct active_grant_entry *act;
- mfn_t r_frame;
+ mfn_t mfn;
uint16_t *status;
grant_ref_t trans_gref;
struct domain *td;
@@ -2329,7 +2329,7 @@ release_grant_for_copy(
act = active_entry_acquire(rgt, gref);
sha = shared_entry_header(rgt, gref);
- r_frame = act->frame;
+ mfn = act->mfn;
if ( rgt->gt_version == 1 )
{
@@ -2350,7 +2350,7 @@ release_grant_for_copy(
}
else
{
- gnttab_mark_dirty(rd, r_frame);
+ gnttab_mark_dirty(rd, mfn);
act->pin -= GNTPIN_hstw_inc;
if ( !(act->pin & (GNTPIN_devw_mask|GNTPIN_hstw_mask)) )
@@ -2390,15 +2390,17 @@ static void fixup_status_for_copy_pin(const struct
active_grant_entry *act,
gnttab_clear_flag(_GTF_reading, status);
}
-/* Grab a frame number from a grant entry and update the flags and pin
- count as appropriate. If rc == GNTST_okay, note that this *does*
- take one ref count on the target page, stored in *page.
- If there is any error, *page = NULL, no ref taken. */
+/*
+ * Grab a machine frame number from a grant entry and update the flags
+ * and pin count as appropriate. If rc == GNTST_okay, note that this *does*
+ * take one ref count on the target page, stored in *page.
+ * If there is any error, *page = NULL, no ref taken.
+ */
static int
acquire_grant_for_copy(
struct domain *rd, grant_ref_t gref, domid_t ldom, bool readonly,
- mfn_t *frame, struct page_info **page,
- uint16_t *page_off, uint16_t *length, bool allow_transitive)
+ mfn_t *mfn, struct page_info **page, uint16_t *page_off,
+ uint16_t *length, bool allow_transitive)
{
struct grant_table *rgt = rd->grant_table;
grant_entry_v2_t *sha2;
@@ -2409,7 +2411,7 @@ acquire_grant_for_copy(
domid_t trans_domid;
grant_ref_t trans_gref;
struct domain *td;
- mfn_t grant_frame;
+ mfn_t grant_mfn;
uint16_t trans_page_off;
uint16_t trans_length;
bool is_sub_page;
@@ -2487,7 +2489,7 @@ acquire_grant_for_copy(
grant_read_unlock(rgt);
rc = acquire_grant_for_copy(td, trans_gref, rd->domain_id,
- readonly, &grant_frame, page,
+ readonly, &grant_mfn, page,
&trans_page_off, &trans_length,
false);
@@ -2511,7 +2513,7 @@ acquire_grant_for_copy(
if ( rgt->gt_version != 2 ||
act->pin != old_pin ||
(old_pin && (act->domid != ldom ||
- !mfn_eq(act->frame, grant_frame) ||
+ !mfn_eq(act->mfn, grant_mfn) ||
act->start != trans_page_off ||
act->length != trans_length ||
act->trans_domain != td ||
@@ -2535,7 +2537,7 @@ acquire_grant_for_copy(
act->length = trans_length;
act->trans_domain = td;
act->trans_gref = trans_gref;
- act->frame = grant_frame;
+ act->mfn = grant_mfn;
act_set_gfn(act, INVALID_GFN);
/*
* The actual remote remote grant may or may not be a sub-page,
@@ -2559,7 +2561,7 @@ acquire_grant_for_copy(
{
unsigned long gfn = shared_entry_v1(rgt, gref).frame;
- rc = get_paged_frame(gfn, &grant_frame, page, readonly, rd);
+ rc = get_paged_frame(gfn, &grant_mfn, page, readonly, rd);
if ( rc != GNTST_okay )
goto unlock_out_clear;
act_set_gfn(act, _gfn(gfn));
@@ -2569,7 +2571,7 @@ acquire_grant_for_copy(
}
else if ( !(sha2->hdr.flags & GTF_sub_page) )
{
- rc = get_paged_frame(sha2->full_page.frame, &grant_frame, page,
+ rc = get_paged_frame(sha2->full_page.frame, &grant_mfn, page,
readonly, rd);
if ( rc != GNTST_okay )
goto unlock_out_clear;
@@ -2580,7 +2582,7 @@ acquire_grant_for_copy(
}
else
{
- rc = get_paged_frame(sha2->sub_page.frame, &grant_frame, page,
+ rc = get_paged_frame(sha2->sub_page.frame, &grant_mfn, page,
readonly, rd);
if ( rc != GNTST_okay )
goto unlock_out_clear;
@@ -2598,13 +2600,13 @@ acquire_grant_for_copy(
act->length = trans_length;
act->trans_domain = td;
act->trans_gref = trans_gref;
- act->frame = grant_frame;
+ act->mfn = grant_mfn;
}
}
else
{
- ASSERT(mfn_valid(act->frame));
- *page = mfn_to_page(act->frame);
+ ASSERT(mfn_valid(act->mfn));
+ *page = mfn_to_page(act->mfn);
td = page_get_owner_and_reference(*page);
/*
* act->pin being non-zero should guarantee the page to have a
@@ -2628,7 +2630,7 @@ acquire_grant_for_copy(
*page_off = act->start;
*length = act->length;
- *frame = act->frame;
+ *mfn = act->mfn;
active_entry_release(act);
grant_read_unlock(rgt);
@@ -2658,7 +2660,7 @@ struct gnttab_copy_buf {
/* Mapped etc. */
struct domain *domain;
- mfn_t frame;
+ mfn_t mfn;
struct page_info *page;
void *virt;
bool_t read_only;
@@ -2764,7 +2766,7 @@ static int gnttab_copy_claim_buf(const struct gnttab_copy
*op,
rc = acquire_grant_for_copy(buf->domain, ptr->u.ref,
current->domain->domain_id,
buf->read_only,
- &buf->frame, &buf->page,
+ &buf->mfn, &buf->page,
&buf->ptr.offset, &buf->len,
opt_transitive_grants);
if ( rc != GNTST_okay )
@@ -2774,7 +2776,7 @@ static int gnttab_copy_claim_buf(const struct gnttab_copy
*op,
}
else
{
- rc = get_paged_frame(ptr->u.gmfn, &buf->frame, &buf->page,
+ rc = get_paged_frame(ptr->u.gmfn, &buf->mfn, &buf->page,
buf->read_only, buf->domain);
if ( rc != GNTST_okay )
PIN_FAIL(out, rc,
@@ -2792,14 +2794,14 @@ static int gnttab_copy_claim_buf(const struct
gnttab_copy *op,
if ( !buf->domain->is_dying )
gdprintk(XENLOG_WARNING,
"Could not get writable frame %#"PRI_mfn"\n",
- mfn_x(buf->frame));
+ mfn_x(buf->mfn));
rc = GNTST_general_error;
goto out;
}
buf->have_type = 1;
}
- buf->virt = map_domain_page(buf->frame);
+ buf->virt = map_domain_page(buf->mfn);
rc = GNTST_okay;
out:
@@ -2843,7 +2845,7 @@ static int gnttab_copy_buf(const struct gnttab_copy *op,
memcpy(dest->virt + op->dest.offset, src->virt + op->source.offset,
op->len);
- gnttab_mark_dirty(dest->domain, dest->frame);
+ gnttab_mark_dirty(dest->domain, dest->mfn);
rc = GNTST_okay;
out:
return rc;
@@ -3661,7 +3663,7 @@ gnttab_release_mappings(
else
status = &status_entry(rgt, ref);
- pg = mfn_to_page(act->frame);
+ pg = mfn_to_page(act->mfn);
if ( map->flags & GNTMAP_readonly )
{
@@ -3669,7 +3671,7 @@ gnttab_release_mappings(
{
BUG_ON(!(act->pin & GNTPIN_devr_mask));
act->pin -= GNTPIN_devr_inc;
- if ( !is_iomem_page(act->frame) )
+ if ( !is_iomem_page(act->mfn) )
put_page(pg);
}
@@ -3678,7 +3680,7 @@ gnttab_release_mappings(
BUG_ON(!(act->pin & GNTPIN_hstr_mask));
act->pin -= GNTPIN_hstr_inc;
if ( gnttab_release_host_mappings(d) &&
- !is_iomem_page(act->frame) )
+ !is_iomem_page(act->mfn) )
put_page(pg);
}
}
@@ -3688,7 +3690,7 @@ gnttab_release_mappings(
{
BUG_ON(!(act->pin & GNTPIN_devw_mask));
act->pin -= GNTPIN_devw_inc;
- if ( !is_iomem_page(act->frame) )
+ if ( !is_iomem_page(act->mfn) )
put_page_and_type(pg);
}
@@ -3697,7 +3699,7 @@ gnttab_release_mappings(
BUG_ON(!(act->pin & GNTPIN_hstw_mask));
act->pin -= GNTPIN_hstw_inc;
if ( gnttab_release_host_mappings(d) &&
- !is_iomem_page(act->frame) )
+ !is_iomem_page(act->mfn) )
{
if ( gnttab_host_mapping_get_page_type((map->flags &
GNTMAP_readonly),
@@ -3754,7 +3756,7 @@ void grant_table_warn_active_grants(struct domain *d)
#ifndef NDEBUG
gfn_x(act->gfn),
#endif
- mfn_x(act->frame));
+ mfn_x(act->mfn));
active_entry_release(act);
}
@@ -3963,7 +3965,7 @@ static void gnttab_usage_print(struct domain *rd)
/* [0xXXX] ddddd 0xXXXXX 0xXXXXXXXX ddddd 0xXXXXXX 0xXX */
printk("[0x%03x] %5d 0x%"PRI_mfn" 0x%08x %5d 0x%06"PRIx64"
0x%02x\n",
- ref, act->domid, mfn_x(act->frame), act->pin,
+ ref, act->domid, mfn_x(act->mfn), act->pin,
sha->domid, frame, status);
active_entry_release(act);
}
--
generated by git-patchbot for /home/xen/git/xen.git#staging
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