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: <1713928915-18229-3-git-send-email-quic_qianyu@quicinc.com>
Date: Wed, 24 Apr 2024 11:21:54 +0800
From: Qiang Yu <quic_qianyu@...cinc.com>
To: mani@...nel.org, quic_jhugo@...cinc.com
Cc: mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_cang@...cinc.com,
        quic_mrana@...cinc.com, Qiang Yu <quic_qianyu@...cinc.com>
Subject: [PATCH v5 2/3] bus: mhi: host: Add a new API for getting channel doorbell address

Some controllers may want to know the address of a certain doorbell. Hence
add a new API where we read CHDBOFF register to get the base address of
doorbell, so that the controller can calculate the address of the doorbell
it wants by adding additional offset.

Signed-off-by: Qiang Yu <quic_qianyu@...cinc.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@...cinc.com>
---
 drivers/bus/mhi/host/init.c |  6 ++----
 drivers/bus/mhi/host/main.c | 16 ++++++++++++++++
 include/linux/mhi.h         |  7 +++++++
 3 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/drivers/bus/mhi/host/init.c b/drivers/bus/mhi/host/init.c
index 7104c18..6e0fa79 100644
--- a/drivers/bus/mhi/host/init.c
+++ b/drivers/bus/mhi/host/init.c
@@ -541,11 +541,9 @@ int mhi_init_mmio(struct mhi_controller *mhi_cntrl)
 	dev_dbg(dev, "Initializing MHI registers\n");
 
 	/* Read channel db offset */
-	ret = mhi_read_reg(mhi_cntrl, base, CHDBOFF, &val);
-	if (ret) {
-		dev_err(dev, "Unable to read CHDBOFF register\n");
+	ret = mhi_get_channel_doorbell_offset(mhi_cntrl, &val);
+	if (ret)
 		return -EIO;
-	}
 
 	if (val >= mhi_cntrl->reg_len - (8 * MHI_DEV_WAKE_DB)) {
 		dev_err(dev, "CHDB offset: 0x%x is out of range: 0x%zx\n",
diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c
index 15d657a..4de7567 100644
--- a/drivers/bus/mhi/host/main.c
+++ b/drivers/bus/mhi/host/main.c
@@ -1691,3 +1691,19 @@ void mhi_unprepare_from_transfer(struct mhi_device *mhi_dev)
 	}
 }
 EXPORT_SYMBOL_GPL(mhi_unprepare_from_transfer);
+
+int mhi_get_channel_doorbell_offset(struct mhi_controller *mhi_cntrl, u32 *chdb_offset)
+{
+	struct device *dev = &mhi_cntrl->mhi_dev->dev;
+	void __iomem *base = mhi_cntrl->regs;
+	int ret;
+
+	ret = mhi_read_reg(mhi_cntrl, base, CHDBOFF, chdb_offset);
+	if (ret) {
+		dev_err(dev, "Unable to read CHDBOFF register\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mhi_get_channel_doorbell_offset);
diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index d968e1a..2cf1b3a 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -816,4 +816,11 @@ int mhi_queue_skb(struct mhi_device *mhi_dev, enum dma_data_direction dir,
  */
 bool mhi_queue_is_full(struct mhi_device *mhi_dev, enum dma_data_direction dir);
 
+/**
+ * mhi_get_channel_doorbell_offset - Get the channel doorbell offset
+ * @mhi_cntrl: MHI controller
+ * @chdb_offset: Channel doorbell offset
+ */
+int mhi_get_channel_doorbell_offset(struct mhi_controller *mhi_cntrl, u32 *chdb_offset);
+
 #endif /* _MHI_H_ */
-- 
2.7.4


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ