[XEN PATCH v9 19/24] xen/arm: ffa: add support to reclaim shared memory

[Jens Wiklander <jens.wiklander@xxxxxxxxxx>]

Adds support to reclaim memory previously shared with FFA_MEM_SHARE.

A memory region that doesn't need to be shared any longer can be
reclaimed with FFA_MEM_RECLAIM once the SP doesn't use it any longer.
This is checked by the SPMC and not in control of the mediator.

Adds a check that the SP supports the needed FF-A feature
FFA_MEM_RECLAIM.

Signed-off-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
---
 xen/arch/arm/tee/ffa.c | 53 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/xen/arch/arm/tee/ffa.c b/xen/arch/arm/tee/ffa.c
index f3eb84a8e9b7..c623c51168b9 100644
--- a/xen/arch/arm/tee/ffa.c
+++ b/xen/arch/arm/tee/ffa.c
@@ -538,6 +538,12 @@ static int32_t ffa_mem_share(uint32_t tot_len, uint32_t 
frag_len,
     }
 }
 
+static int32_t ffa_mem_reclaim(uint32_t handle_lo, uint32_t handle_hi,
+                               uint32_t flags)
+{
+    return ffa_simple_call(FFA_MEM_RECLAIM, handle_lo, handle_hi, flags, 0);
+}
+
 static int32_t ffa_direct_req_send_vm(uint16_t sp_id, uint16_t vm_id,
                                       uint8_t msg)
 {
@@ -1278,6 +1284,43 @@ out_set_ret:
             set_regs_error(regs, ret);
 }
 
+static int handle_mem_reclaim(uint64_t handle, uint32_t flags)
+{
+    struct domain *d = current->domain;
+    struct ffa_ctx *ctx = d->arch.tee;
+    struct ffa_shm_mem *shm;
+    register_t handle_hi;
+    register_t handle_lo;
+    int ret;
+
+    spin_lock(&ctx->lock);
+    list_for_each_entry(shm, &ctx->shm_list, list)
+    {
+        if ( shm->handle == handle )
+            goto found_it;
+    }
+    shm = NULL;
+    ret = FFA_RET_INVALID_PARAMETERS;
+    goto out;
+found_it:
+
+    uint64_to_regpair(&handle_hi, &handle_lo, handle);
+    ret = ffa_mem_reclaim(handle_lo, handle_hi, flags);
+    if ( ret )
+    {
+        shm = NULL;
+        goto out;
+    }
+
+    list_del(&shm->list);
+
+out:
+    free_ffa_shm_mem(ctx, shm);
+    spin_unlock(&ctx->lock);
+
+    return ret;
+}
+
 static bool ffa_handle_call(struct cpu_user_regs *regs)
 {
     uint32_t fid = get_user_reg(regs, 0);
@@ -1339,6 +1382,15 @@ static bool ffa_handle_call(struct cpu_user_regs *regs)
     case FFA_MEM_SHARE_64:
         handle_mem_share(regs);
         return true;
+    case FFA_MEM_RECLAIM:
+        e = handle_mem_reclaim(regpair_to_uint64(get_user_reg(regs, 2),
+                                                 get_user_reg(regs, 1)),
+                               get_user_reg(regs, 3));
+        if ( e )
+            set_regs_error(regs, e);
+        else
+            set_regs_success(regs, 0, 0);
+        return true;
 
     default:
         gprintk(XENLOG_ERR, "ffa: unhandled fid 0x%x\n", fid);
@@ -1573,6 +1625,7 @@ static bool ffa_probe(void)
          !check_mandatory_feature(FFA_MEM_SHARE_64) ||
          !check_mandatory_feature(FFA_RXTX_UNMAP) ||
          !check_mandatory_feature(FFA_MEM_SHARE_32) ||
+         !check_mandatory_feature(FFA_MEM_RECLAIM) ||
          !check_mandatory_feature(FFA_MSG_SEND_DIRECT_REQ_32) )
         return false;
 
-- 
2.34.1