linux-kernel - [PATCH v8 03/15] wlcore: simplify/fix/optimize reg_ch_conf

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Date:   Wed, 24 Apr 2019 12:32:50 -0700
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     "Thomas Gleixner" <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>,
        "H Peter Anvin" <hpa@...or.com>,
        "Paolo Bonzini" <pbonzini@...hat.com>,
        "Dave Hansen" <dave.hansen@...el.com>,
        "Ashok Raj" <ashok.raj@...el.com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Ravi V Shankar" <ravi.v.shankar@...el.com>,
        "Xiaoyao Li " <xiaoyao.li@...el.com>,
        "Christopherson Sean J" <sean.j.christopherson@...el.com>,
        "Kalle Valo" <kvalo@...eaurora.org>,
        "Michael Chan" <michael.chan@...adcom.com>
Cc:     "linux-kernel" <linux-kernel@...r.kernel.org>,
        "x86" <x86@...nel.org>, kvm@...r.kernel.org,
        netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        Fenghua Yu <fenghua.yu@...el.com>
Subject: [PATCH v8 03/15] wlcore: simplify/fix/optimize reg_ch_conf_pending operations

From: Paolo Bonzini <pbonzini@...hat.com>

Bitmaps are defined on unsigned longs, so the usage of u32[2] in the
wlcore driver is incorrect.  As noted by Peter Zijlstra, casting arrays
to a bitmap is incorrect for big-endian architectures.

When looking at it I observed that:

- operations on reg_ch_conf_pending is always under the wl_lock mutex,
so set_bit is overkill

- the only case where reg_ch_conf_pending is accessed a u32 at a time is
unnecessary too.

This patch cleans up everything in this area, and changes tmp_ch_bitmap
to have the proper alignment.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
 drivers/net/wireless/ti/wlcore/cmd.c    | 15 ++++++---------
 drivers/net/wireless/ti/wlcore/wlcore.h |  4 ++--
 2 files changed, 8 insertions(+), 11 deletions(-)

diff --git a/drivers/net/wireless/ti/wlcore/cmd.c b/drivers/net/wireless/ti/wlcore/cmd.c
index 348be0aed97e..0415a064f6e2 100644
--- a/drivers/net/wireless/ti/wlcore/cmd.c
+++ b/drivers/net/wireless/ti/wlcore/cmd.c
@@ -1700,14 +1700,14 @@ void wlcore_set_pending_regdomain_ch(struct wl1271 *wl, u16 channel,
 	ch_bit_idx = wlcore_get_reg_conf_ch_idx(band, channel);
 
 	if (ch_bit_idx >= 0 && ch_bit_idx <= WL1271_MAX_CHANNELS)
-		set_bit(ch_bit_idx, (long *)wl->reg_ch_conf_pending);
+		__set_bit_le(ch_bit_idx, (long *)wl->reg_ch_conf_pending);
 }
 
 int wlcore_cmd_regdomain_config_locked(struct wl1271 *wl)
 {
 	struct wl12xx_cmd_regdomain_dfs_config *cmd = NULL;
 	int ret = 0, i, b, ch_bit_idx;
-	u32 tmp_ch_bitmap[2];
+	__le32 tmp_ch_bitmap[2] __aligned(sizeof(unsigned long));
 	struct wiphy *wiphy = wl->hw->wiphy;
 	struct ieee80211_supported_band *band;
 	bool timeout = false;
@@ -1717,7 +1717,7 @@ int wlcore_cmd_regdomain_config_locked(struct wl1271 *wl)
 
 	wl1271_debug(DEBUG_CMD, "cmd reg domain config");
 
-	memset(tmp_ch_bitmap, 0, sizeof(tmp_ch_bitmap));
+	memcpy(tmp_ch_bitmap, wl->reg_ch_conf_pending, sizeof(tmp_ch_bitmap));
 
 	for (b = NL80211_BAND_2GHZ; b <= NL80211_BAND_5GHZ; b++) {
 		band = wiphy->bands[b];
@@ -1738,13 +1738,10 @@ int wlcore_cmd_regdomain_config_locked(struct wl1271 *wl)
 			if (ch_bit_idx < 0)
 				continue;
 
-			set_bit(ch_bit_idx, (long *)tmp_ch_bitmap);
+			__set_bit_le(ch_bit_idx, (long *)tmp_ch_bitmap);
 		}
 	}
 
-	tmp_ch_bitmap[0] |= wl->reg_ch_conf_pending[0];
-	tmp_ch_bitmap[1] |= wl->reg_ch_conf_pending[1];
-
 	if (!memcmp(tmp_ch_bitmap, wl->reg_ch_conf_last, sizeof(tmp_ch_bitmap)))
 		goto out;
 
@@ -1754,8 +1751,8 @@ int wlcore_cmd_regdomain_config_locked(struct wl1271 *wl)
 		goto out;
 	}
 
-	cmd->ch_bit_map1 = cpu_to_le32(tmp_ch_bitmap[0]);
-	cmd->ch_bit_map2 = cpu_to_le32(tmp_ch_bitmap[1]);
+	cmd->ch_bit_map1 = tmp_ch_bitmap[0];
+	cmd->ch_bit_map2 = tmp_ch_bitmap[1];
 	cmd->dfs_region = wl->dfs_region;
 
 	wl1271_debug(DEBUG_CMD,
diff --git a/drivers/net/wireless/ti/wlcore/wlcore.h b/drivers/net/wireless/ti/wlcore/wlcore.h
index dd14850b0603..870eea3e7a27 100644
--- a/drivers/net/wireless/ti/wlcore/wlcore.h
+++ b/drivers/net/wireless/ti/wlcore/wlcore.h
@@ -320,9 +320,9 @@ struct wl1271 {
 	bool watchdog_recovery;
 
 	/* Reg domain last configuration */
-	u32 reg_ch_conf_last[2]  __aligned(8);
+	DECLARE_BITMAP(reg_ch_conf_last, 64);
 	/* Reg domain pending configuration */
-	u32 reg_ch_conf_pending[2];
+	DECLARE_BITMAP(reg_ch_conf_pending, 64);
 
 	/* Pointer that holds DMA-friendly block for the mailbox */
 	void *mbox;
-- 
2.19.1