From 21254908cbe995a3982a23da32c30d1b43467043 Mon Sep 17 00:00:00 2001
From: Gregory Greenman <gregory.greenman@intel.com>
Date: Wed, 10 Feb 2021 17:15:03 +0200
Subject: iwlwifi: mvm: add RFI-M support
RF Interference Mitigation is a new feature targeted to handle the
problem of interference between DDR memory and WiFi. The role of
the driver is to configure FW with the table holding a mapping
between problematic channels/bands and the corresponding frequencies.
This patch adds RFI infrastructure and adds two debugfs hooks:
- send RFI configuration command (currently with a default table) which
will reset feature in the FW
- read the table, used by the FW (which can be a subset of the table
that driver sent).
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210210171218.2cea55a09bc7.I634b79795abad499ce442631d6672ffef8fc6d41@changeid
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c | 65 ++++++++++++++++++++++++
1 file changed, 65 insertions(+)
(limited to 'drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c')
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
index efc908231d74..90143b16e665 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
@@ -1776,6 +1776,69 @@ iwl_dbgfs_ltr_config_write(struct iwl_mvm *mvm,
return ret ?: count;
}
+static ssize_t iwl_dbgfs_rfi_freq_table_write(struct iwl_mvm *mvm, char *buf,
+ size_t count, loff_t *ppos)
+{
+ int ret = 0;
+ u16 op_id;
+
+ if (kstrtou16(buf, 10, &op_id))
+ return -EINVAL;
+
+ /* value zero triggers re-sending the default table to the device */
+ if (!op_id)
+ ret = iwl_rfi_send_config_cmd(mvm, NULL);
+ else
+ ret = -EOPNOTSUPP; /* in the future a new table will be added */
+
+ return ret ?: count;
+}
+
+/* The size computation is as follows:
+ * each number needs at most 3 characters, number of rows is the size of
+ * the table; So, need 5 chars for the "freq: " part and each tuple afterwards
+ * needs 6 characters for numbers and 5 for the punctuation around.
+ */
+#define IWL_RFI_BUF_SIZE (IWL_RFI_LUT_INSTALLED_SIZE *\
+ (5 + IWL_RFI_LUT_ENTRY_CHANNELS_NUM * (6 + 5)))
+
+static ssize_t iwl_dbgfs_rfi_freq_table_read(struct file *file,
+ char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct iwl_mvm *mvm = file->private_data;
+ struct iwl_rfi_freq_table_resp_cmd *resp;
+ u32 status;
+ char buf[IWL_RFI_BUF_SIZE];
+ int i, j, pos = 0;
+
+ resp = iwl_rfi_get_freq_table(mvm);
+ if (IS_ERR(resp))
+ return PTR_ERR(resp);
+
+ status = le32_to_cpu(resp->status);
+ if (status != RFI_FREQ_TABLE_OK) {
+ scnprintf(buf, IWL_RFI_BUF_SIZE, "status = %d\n", status);
+ goto out;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(resp->table); i++) {
+ pos += scnprintf(buf + pos, IWL_RFI_BUF_SIZE - pos, "%d: ",
+ resp->table[i].freq);
+
+ for (j = 0; j < ARRAY_SIZE(resp->table[i].channels); j++)
+ pos += scnprintf(buf + pos, IWL_RFI_BUF_SIZE - pos,
+ "(%d, %d) ",
+ resp->table[i].channels[j],
+ resp->table[i].bands[j]);
+ pos += scnprintf(buf + pos, IWL_RFI_BUF_SIZE - pos, "\n");
+ }
+
+out:
+ kfree(resp);
+ return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
+}
+
MVM_DEBUGFS_READ_WRITE_FILE_OPS(prph_reg, 64);
/* Device wide debugfs entries */
@@ -1827,6 +1890,7 @@ MVM_DEBUGFS_READ_WRITE_STA_FILE_OPS(amsdu_len, 16);
MVM_DEBUGFS_READ_WRITE_FILE_OPS(he_sniffer_params, 32);
MVM_DEBUGFS_WRITE_FILE_OPS(ltr_config, 512);
+MVM_DEBUGFS_READ_WRITE_FILE_OPS(rfi_freq_table, 16);
static ssize_t iwl_dbgfs_mem_read(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
@@ -2010,6 +2074,7 @@ void iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir)
MVM_DEBUGFS_ADD_FILE(inject_packet, mvm->debugfs_dir, 0200);
MVM_DEBUGFS_ADD_FILE(inject_beacon_ie, mvm->debugfs_dir, 0200);
MVM_DEBUGFS_ADD_FILE(inject_beacon_ie_restore, mvm->debugfs_dir, 0200);
+ MVM_DEBUGFS_ADD_FILE(rfi_freq_table, mvm->debugfs_dir, 0600);
if (mvm->fw->phy_integration_ver)
MVM_DEBUGFS_ADD_FILE(phy_integration_ver, mvm->debugfs_dir, 0400);
--
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