[Xen-changelog] [xen master] ARM: vITS: handle DISCARD command

[patchbot@xxxxxxx]

commit 5928960ee711e0ea4aa44b81f80e4babafdead7e
Author:     Andre Przywara <andre.przywara@xxxxxxx>
AuthorDate: Wed Sep 7 01:51:41 2016 +0100
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Wed Jun 14 11:38:38 2017 -0700

    ARM: vITS: handle DISCARD command
    
    The DISCARD command drops the connection between a DeviceID/EventID
    and an LPI/collection pair.
    We mark the respective structure entries as not allocated and make
    sure that any queued IRQs are removed.
    
    Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
    Acked-by: Julien Grall <julien.grall@xxxxxxx>
    Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/arch/arm/vgic-v3-its.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c
index 07ee1b1..ad22bde 100644
--- a/xen/arch/arm/vgic-v3-its.c
+++ b/xen/arch/arm/vgic-v3-its.c
@@ -714,6 +714,29 @@ out_unlock:
     return ret;
 }
 
+static int its_handle_discard(struct virt_its *its, uint64_t *cmdptr)
+{
+    uint32_t devid = its_cmd_get_deviceid(cmdptr);
+    uint32_t eventid = its_cmd_get_id(cmdptr);
+    int ret;
+
+    spin_lock(&its->its_lock);
+
+    /* Remove from the radix tree and remove the host entry. */
+    ret = its_discard_event(its, devid, eventid);
+    if ( ret )
+        goto out_unlock;
+
+    /* Remove from the guest's ITTE. */
+    if ( !write_itte(its, devid, eventid, UNMAPPED_COLLECTION, INVALID_LPI) )
+        ret = -1;
+
+out_unlock:
+    spin_unlock(&its->its_lock);
+
+    return ret;
+}
+
 #define ITS_CMD_BUFFER_SIZE(baser)      ((((baser) & 0xff) + 1) << 12)
 #define ITS_CMD_OFFSET(reg)             ((reg) & GENMASK(19, 5))
 
@@ -753,6 +776,9 @@ static int vgic_its_handle_cmds(struct domain *d, struct 
virt_its *its)
         case GITS_CMD_CLEAR:
             ret = its_handle_clear(its, command);
             break;
+        case GITS_CMD_DISCARD:
+            ret = its_handle_discard(its, command);
+            break;
         case GITS_CMD_INT:
             ret = its_handle_int(its, command);
             break;
--
generated by git-patchbot for /home/xen/git/xen.git#master

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