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Message-ID: <20211122050509.5979-2-quic_hyiwei@quicinc.com>
Date: Mon, 22 Nov 2021 13:05:06 +0800
From: Huang Yiwei <quic_hyiwei@...cinc.com>
To: <agross@...nel.org>, <bjorn.andersson@...aro.org>,
<mani@...nel.org>, <jassisinghbrar@...il.com>, <robh+dt@...nel.org>
CC: <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>, <quic_psodagud@...cinc.com>,
<quic_tsoni@...cinc.com>, <quic_aiquny@...cinc.com>,
<quic_eberman@...cinc.com>, Huang Yiwei <quic_hyiwei@...cinc.com>
Subject: [PATCH 1/4] mailbox: qcom-ipcc: Dynamic alloc for channel arrangement
Dynamic alloc for channel arrangement instead of static alloced
array, it is more flexible and can reduce memory usage.
Signed-off-by: Huang Yiwei <quic_hyiwei@...cinc.com>
---
drivers/mailbox/qcom-ipcc.c | 90 ++++++++++++++++++++++++++++---------
1 file changed, 69 insertions(+), 21 deletions(-)
diff --git a/drivers/mailbox/qcom-ipcc.c b/drivers/mailbox/qcom-ipcc.c
index f1d4f4679b17..10cb0b546109 100644
--- a/drivers/mailbox/qcom-ipcc.c
+++ b/drivers/mailbox/qcom-ipcc.c
@@ -13,8 +13,6 @@
#include <dt-bindings/mailbox/qcom-ipcc.h>
-#define IPCC_MBOX_MAX_CHAN 48
-
/* IPCC Register offsets */
#define IPCC_REG_SEND_ID 0x0c
#define IPCC_REG_RECV_ID 0x10
@@ -52,9 +50,10 @@ struct qcom_ipcc {
struct device *dev;
void __iomem *base;
struct irq_domain *irq_domain;
- struct mbox_chan chan[IPCC_MBOX_MAX_CHAN];
- struct qcom_ipcc_chan_info mchan[IPCC_MBOX_MAX_CHAN];
+ struct mbox_chan *chans;
+ struct qcom_ipcc_chan_info *mchan;
struct mbox_controller mbox;
+ int num_chans;
int irq;
};
@@ -166,25 +165,37 @@ static struct mbox_chan *qcom_ipcc_mbox_xlate(struct mbox_controller *mbox,
struct qcom_ipcc *ipcc = to_qcom_ipcc(mbox);
struct qcom_ipcc_chan_info *mchan;
struct mbox_chan *chan;
- unsigned int i;
+ struct device *dev;
+ int chan_id;
+
+ dev = ipcc->dev;
if (ph->args_count != 2)
return ERR_PTR(-EINVAL);
- for (i = 0; i < IPCC_MBOX_MAX_CHAN; i++) {
- chan = &ipcc->chan[i];
- if (!chan->con_priv) {
- mchan = &ipcc->mchan[i];
- mchan->client_id = ph->args[0];
- mchan->signal_id = ph->args[1];
- chan->con_priv = mchan;
- break;
- }
+ for (chan_id = 0; chan_id < mbox->num_chans; chan_id++) {
+ chan = &ipcc->chans[chan_id];
+ mchan = chan->con_priv;
- chan = NULL;
+ if (!mchan)
+ break;
+ else if (mchan->client_id == ph->args[0] &&
+ mchan->signal_id == ph->args[1])
+ return ERR_PTR(-EBUSY);
}
- return chan ?: ERR_PTR(-EBUSY);
+ if (chan_id >= mbox->num_chans)
+ return ERR_PTR(-EBUSY);
+
+ mchan = devm_kzalloc(dev, sizeof(*mchan), GFP_KERNEL);
+ if (!mchan)
+ return ERR_PTR(-ENOMEM);
+
+ mchan->client_id = ph->args[0];
+ mchan->signal_id = ph->args[1];
+ chan->con_priv = mchan;
+
+ return chan;
}
static const struct mbox_chan_ops ipcc_mbox_chan_ops = {
@@ -192,15 +203,49 @@ static const struct mbox_chan_ops ipcc_mbox_chan_ops = {
.shutdown = qcom_ipcc_mbox_shutdown,
};
-static int qcom_ipcc_setup_mbox(struct qcom_ipcc *ipcc)
+static int qcom_ipcc_setup_mbox(struct qcom_ipcc *ipcc,
+ struct device_node *controller_dn)
{
+ struct of_phandle_args curr_ph;
+ struct device_node *client_dn;
struct mbox_controller *mbox;
struct device *dev = ipcc->dev;
+ int i, j, ret;
+
+ /*
+ * Find out the number of clients interested in this mailbox
+ * and create channels accordingly.
+ */
+ ipcc->num_chans = 0;
+ for_each_node_with_property(client_dn, "mboxes") {
+ if (!of_device_is_available(client_dn))
+ continue;
+ i = of_count_phandle_with_args(client_dn,
+ "mboxes", "#mbox-cells");
+ for (j = 0; j < i; j++) {
+ ret = of_parse_phandle_with_args(client_dn, "mboxes",
+ "#mbox-cells", j, &curr_ph);
+ of_node_put(curr_ph.np);
+ if (!ret && curr_ph.np == controller_dn) {
+ ipcc->num_chans++;
+ break;
+ }
+ }
+ }
+
+ /* If no clients are found, skip registering as a mbox controller */
+ if (!ipcc->num_chans)
+ return 0;
+
+ ipcc->chans = devm_kcalloc(dev, ipcc->num_chans,
+ sizeof(struct mbox_chan), GFP_KERNEL);
+ if (!ipcc->chans)
+ return -ENOMEM;
mbox = &ipcc->mbox;
mbox->dev = dev;
- mbox->num_chans = IPCC_MBOX_MAX_CHAN;
- mbox->chans = ipcc->chan;
+ mbox->num_chans = ipcc->num_chans;
+ mbox->chans = ipcc->chans;
mbox->ops = &ipcc_mbox_chan_ops;
mbox->of_xlate = qcom_ipcc_mbox_xlate;
mbox->txdone_irq = false;
@@ -233,7 +278,7 @@ static int qcom_ipcc_probe(struct platform_device *pdev)
if (!ipcc->irq_domain)
return -ENOMEM;
- ret = qcom_ipcc_setup_mbox(ipcc);
+ ret = qcom_ipcc_setup_mbox(ipcc, pdev->dev.of_node);
if (ret)
goto err_mbox;
@@ -241,7 +286,7 @@ static int qcom_ipcc_probe(struct platform_device *pdev)
IRQF_TRIGGER_HIGH, "ipcc", ipcc);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to register the irq: %d\n", ret);
- goto err_mbox;
+ goto err_req_irq;
}
enable_irq_wake(ipcc->irq);
@@ -249,6 +294,9 @@ static int qcom_ipcc_probe(struct platform_device *pdev)
return 0;
+err_req_irq:
+ if (ipcc->num_chans)
+ mbox_controller_unregister(&ipcc->mbox);
err_mbox:
irq_domain_remove(ipcc->irq_domain);
--
2.17.1
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