iwlwifi: mvm: add debugfs hook to take an mvm ref

Support taking an mvm ref (and preventing D0i3) by
writing '1' into the d0i3_refs debugfs file.

The reference can be unref by writing 0 to the same
file.

Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

diff --git a/drivers/net/wireless/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/iwlwifi/mvm/debugfs.c
index 2253d5b2a59c4e751af83e215baab19495cf47db..c116765ebe42f02cb50dd5fd30326b5463e939e7 100644 (file)
--- a/drivers/net/wireless/iwlwifi/mvm/debugfs.c
+++ b/drivers/net/wireless/iwlwifi/mvm/debugfs.c
@@ -862,10 +862,39 @@ static ssize_t iwl_dbgfs_d0i3_refs_read(struct file *file,
        PRINT_MVM_REF(IWL_MVM_REF_ROC);
        PRINT_MVM_REF(IWL_MVM_REF_P2P_CLIENT);
        PRINT_MVM_REF(IWL_MVM_REF_AP_IBSS);
+       PRINT_MVM_REF(IWL_MVM_REF_USER);
 
        return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
 }
 
+static ssize_t iwl_dbgfs_d0i3_refs_write(struct iwl_mvm *mvm, char *buf,
+                                        size_t count, loff_t *ppos)
+{
+       unsigned long value;
+       int ret;
+       bool taken;
+
+       ret = kstrtoul(buf, 10, &value);
+       if (ret < 0)
+               return ret;
+
+       mutex_lock(&mvm->mutex);
+
+       taken = test_bit(IWL_MVM_REF_USER, mvm->ref_bitmap);
+       if (value == 1 && !taken)
+               iwl_mvm_ref(mvm, IWL_MVM_REF_USER);
+       else if (value == 0 && taken)
+               iwl_mvm_unref(mvm, IWL_MVM_REF_USER);
+       else
+               ret = -EINVAL;
+
+       mutex_unlock(&mvm->mutex);
+
+       if (ret < 0)
+               return ret;
+       return count;
+}
+
 #define MVM_DEBUGFS_WRITE_FILE_OPS(name, bufsz) \
        _MVM_DEBUGFS_WRITE_FILE_OPS(name, bufsz, struct iwl_mvm)
 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
@@ -890,7 +919,7 @@ MVM_DEBUGFS_READ_FILE_OPS(fw_rx_stats);
 MVM_DEBUGFS_WRITE_FILE_OPS(fw_restart, 10);
 MVM_DEBUGFS_WRITE_FILE_OPS(fw_nmi, 10);
 MVM_DEBUGFS_READ_WRITE_FILE_OPS(scan_ant_rxchain, 8);
-MVM_DEBUGFS_READ_FILE_OPS(d0i3_refs);
+MVM_DEBUGFS_READ_WRITE_FILE_OPS(d0i3_refs, 8);
 
 #ifdef CONFIG_IWLWIFI_BCAST_FILTERING
 MVM_DEBUGFS_READ_WRITE_FILE_OPS(bcast_filters, 256);
@@ -922,7 +951,7 @@ int iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir)
        MVM_DEBUGFS_ADD_FILE(fw_nmi, mvm->debugfs_dir, S_IWUSR);
        MVM_DEBUGFS_ADD_FILE(scan_ant_rxchain, mvm->debugfs_dir,
                             S_IWUSR | S_IRUSR);
-       MVM_DEBUGFS_ADD_FILE(d0i3_refs, mvm->debugfs_dir, S_IRUSR);
+       MVM_DEBUGFS_ADD_FILE(d0i3_refs, mvm->debugfs_dir, S_IRUSR | S_IWUSR);
 
 #ifdef CONFIG_IWLWIFI_BCAST_FILTERING
        if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_BCAST_FILTERING) {

diff --git a/drivers/net/wireless/iwlwifi/mvm/mvm.h b/drivers/net/wireless/iwlwifi/mvm/mvm.h
index f3966078935c5a3d55223bd6e1b7f715d361d22f..1f53adeeba8bc3456e229434b1b0f2e207ff1a9f 100644 (file)
--- a/drivers/net/wireless/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/iwlwifi/mvm/mvm.h
@@ -245,6 +245,7 @@ enum iwl_mvm_ref_type {
        IWL_MVM_REF_ROC,
        IWL_MVM_REF_P2P_CLIENT,
        IWL_MVM_REF_AP_IBSS,
+       IWL_MVM_REF_USER,
 
        IWL_MVM_REF_COUNT,
 };