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hw/cxl/cxl-mailbox-utils: Add superset extent release mailbox support

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With the change, we extend the extent release mailbox command processing
to allow more flexible release. As long as the DPA range of the extent to
release is covered by accepted extent(s) in the device, the release can be
performed.

Tested-by: Svetly Todorov <svetly.todorov@memverge.com>
Reviewed-by: Gregory Price <gregory.price@memverge.com>
Signed-off-by: Fan Ni <fan.ni@samsung.com>
Message-Id: <20240523174651.1089554-14-nifan.cxl@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Fan Ni 2024-05-23 10:44:53 -07:00 • committed by Michael S. Tsirkin
parent e4180db4e6
commit 3083f018b5
1 changed files with 8 additions and 13 deletions
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21
hw/cxl/cxl-mailbox-utils.c
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@ -1704,6 +1704,13 @@ static CXLRetCode cxl_dc_extent_release_dry_run(CXLType3Dev *ct3d,
dpa = in->updated_entries[i].start_dpa;
len = in->updated_entries[i].len;
/* Check if the DPA range is not fully backed with valid extents */
if (!ct3_test_region_block_backed(ct3d, dpa, len)) {
ret = CXL_MBOX_INVALID_PA;
goto free_and_exit;
}
/* After this point, extent overflow is the only error can happen */
while (len > 0) {
QTAILQ_FOREACH(ent, updated_list, node) {
range_init_nofail(&range, ent->start_dpa, ent->len);
@ -1718,14 +1725,7 @@ static CXLRetCode cxl_dc_extent_release_dry_run(CXLType3Dev *ct3d,
if (range_contains(&range, dpa + len - 1)) {
len2 = ent_start_dpa + ent_len - dpa - len;
} else {
/*
* TODO: we reject the attempt to remove an extent
* that overlaps with multiple extents in the device
* for now. We will allow it once superset release
* support is added.
*/
ret = CXL_MBOX_INVALID_PA;
goto free_and_exit;
dpa = ent_start_dpa + ent_len;
}
len_done = ent_len - len1 - len2;
@ -1752,14 +1752,9 @@ static CXLRetCode cxl_dc_extent_release_dry_run(CXLType3Dev *ct3d,
}
len -= len_done;
/* len == 0 here until superset release is added */
break;
}
}
if (len) {
ret = CXL_MBOX_INVALID_PA;
goto free_and_exit;
}
}
}
free_and_exit: