linux-kernel - [PATCH v8 06/10] drivers: qcom: rpmh-rsc: allow invalidation of sleep/wake TCS

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20180509170159.29682-7-ilina@codeaurora.org>
Date:   Wed,  9 May 2018 11:01:55 -0600
From:   Lina Iyer <ilina@...eaurora.org>
To:     andy.gross@...aro.org, david.brown@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org
Cc:     rnayak@...eaurora.org, bjorn.andersson@...aro.org,
        linux-kernel@...r.kernel.org, sboyd@...nel.org,
        evgreen@...omium.org, dianders@...omium.org, mka@...omium.org,
        rplsssn@...eaurora.org, Lina Iyer <ilina@...eaurora.org>
Subject: [PATCH v8 06/10] drivers: qcom: rpmh-rsc: allow invalidation of sleep/wake TCS

Allow sleep and wake commands to be cleared from the respective TCSes,
so that they can be re-populated.

Signed-off-by: Lina Iyer <ilina@...eaurora.org>
---

Changes in v7:
	- Move bitmap_zero() outside the loop

Changes in v6:
	- remove unnecessary locks around __tcs_invalidate
	- rename function to tcs_invaldiate

Changes in v4:
	- refactored the rphm_rsc_invalidate()
---
 drivers/soc/qcom/rpmh-rsc.c | 45 +++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
index b5894b001ae1..68c25ebbbe09 100644
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -104,6 +104,51 @@ static struct tcs_group *get_tcs_of_type(struct rsc_drv *drv, int type)
 	return &drv->tcs[type];
 }
 
+static int tcs_invalidate(struct rsc_drv *drv, int type)
+{
+	int m;
+	struct tcs_group *tcs;
+
+	tcs = get_tcs_of_type(drv, type);
+	if (IS_ERR(tcs))
+		return PTR_ERR(tcs);
+
+	spin_lock(&tcs->lock);
+	if (bitmap_empty(tcs->slots, MAX_TCS_SLOTS)) {
+		spin_unlock(&tcs->lock);
+		return 0;
+	}
+
+	for (m = tcs->offset; m < tcs->offset + tcs->num_tcs; m++) {
+		if (!tcs_is_free(drv, m)) {
+			spin_unlock(&tcs->lock);
+			return -EAGAIN;
+		}
+		write_tcs_reg_sync(drv, RSC_DRV_CMD_ENABLE, m, 0);
+	}
+	bitmap_zero(tcs->slots, MAX_TCS_SLOTS);
+	spin_unlock(&tcs->lock);
+
+	return 0;
+}
+
+/**
+ * rpmh_rsc_invalidate - Invalidate sleep and wake TCSes
+ *
+ * @drv: the RSC controller
+ */
+int rpmh_rsc_invalidate(struct rsc_drv *drv)
+{
+	int ret;
+
+	ret = tcs_invalidate(drv, SLEEP_TCS);
+	if (!ret)
+		ret = tcs_invalidate(drv, WAKE_TCS);
+
+	return ret;
+}
+EXPORT_SYMBOL(rpmh_rsc_invalidate);
+
 static struct tcs_group *get_tcs_for_msg(struct rsc_drv *drv,
 					 const struct tcs_request *msg)
 {
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project