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Message-Id: <20210917133357.1911092-14-sudeep.holla@arm.com>
Date: Fri, 17 Sep 2021 14:33:56 +0100
From: Sudeep Holla <sudeep.holla@....com>
To: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Sudeep Holla <sudeep.holla@....com>,
Cristian Marussi <cristian.marussi@....com>,
"Rafael J . Wysocki" <rjw@...ysocki.net>,
Jassi Brar <jassisinghbrar@...il.com>
Subject: [PATCH v2 13/14] mailbox: pcc: Move bulk of PCCT parsing into pcc_mbox_probe
Move the PCCT subspace parsing and allocation into pcc_mbox_probe so
that we can get rid of global PCC channel and mailbox controller data.
It also helps to make use of devm_* APIs for all the allocations.
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
drivers/mailbox/pcc.c | 124 ++++++++++++++++++++++--------------------
1 file changed, 66 insertions(+), 58 deletions(-)
diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c
index eb90c9eaaf9c..887a3704c12e 100644
--- a/drivers/mailbox/pcc.c
+++ b/drivers/mailbox/pcc.c
@@ -63,8 +63,6 @@
#define MBOX_IRQ_NAME "pcc-mbox"
-static struct mbox_chan *pcc_mbox_channels;
-
/**
* struct pcc_chan_reg - PCC register bundle
*
@@ -106,7 +104,7 @@ struct pcc_chan_info {
#define to_pcc_chan_info(c) container_of(c, struct pcc_chan_info, chan)
static struct pcc_chan_info *chan_info;
-static struct mbox_controller pcc_mbox_ctrl = {};
+static int pcc_chan_count;
/*
* PCC can be used with perf critical drivers such as CPPC
@@ -281,11 +279,11 @@ struct pcc_mbox_chan *
pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
{
struct pcc_chan_info *pchan;
- struct device *dev = pcc_mbox_ctrl.dev;
struct mbox_chan *chan;
+ struct device *dev;
unsigned long flags;
- if (subspace_id < 0 || subspace_id >= pcc_mbox_ctrl.num_chans)
+ if (subspace_id < 0 || subspace_id >= pcc_chan_count)
return ERR_PTR(-ENOENT);
pchan = chan_info + subspace_id;
@@ -294,6 +292,7 @@ pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
dev_err(dev, "Channel not found for idx: %d\n", subspace_id);
return ERR_PTR(-EBUSY);
}
+ dev = chan->mbox->dev;
spin_lock_irqsave(&chan->lock, flags);
chan->msg_free = 0;
@@ -576,16 +575,12 @@ static void pcc_parse_subspace_shmem(struct pcc_chan_info *pchan,
*/
static int __init acpi_pcc_probe(void)
{
+ int count, i, rc = 0;
+ acpi_status status;
struct acpi_table_header *pcct_tbl;
- struct acpi_subtable_header *pcct_entry;
- struct acpi_table_pcct *acpi_pcct_tbl;
struct acpi_subtable_proc proc[ACPI_PCCT_TYPE_RESERVED];
- int count, i, rc;
- acpi_status status = AE_OK;
- /* Search for PCCT */
status = acpi_get_table(ACPI_SIG_PCCT, 0, &pcct_tbl);
-
if (ACPI_FAILURE(status) || !pcct_tbl)
return -ENODEV;
@@ -607,21 +602,60 @@ static int __init acpi_pcc_probe(void)
pr_warn("Invalid PCCT: %d PCC subspaces\n", count);
rc = -EINVAL;
- goto err_put_pcct;
+ } else {
+ pcc_chan_count = count;
}
- pcc_mbox_channels = kcalloc(count, sizeof(struct mbox_chan),
- GFP_KERNEL);
+ acpi_put_table(pcct_tbl);
+
+ return rc;
+}
+
+/**
+ * pcc_mbox_probe - Called when we find a match for the
+ * PCCT platform device. This is purely used to represent
+ * the PCCT as a virtual device for registering with the
+ * generic Mailbox framework.
+ *
+ * @pdev: Pointer to platform device returned when a match
+ * is found.
+ *
+ * Return: 0 for Success, else errno.
+ */
+static int pcc_mbox_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mbox_controller *pcc_mbox_ctrl;
+ struct mbox_chan *pcc_mbox_channels;
+ struct acpi_table_header *pcct_tbl;
+ struct acpi_subtable_header *pcct_entry;
+ struct acpi_table_pcct *acpi_pcct_tbl;
+ acpi_status status = AE_OK;
+ int i, rc, count = pcc_chan_count;
+
+ /* Search for PCCT */
+ status = acpi_get_table(ACPI_SIG_PCCT, 0, &pcct_tbl);
+
+ if (ACPI_FAILURE(status) || !pcct_tbl)
+ return -ENODEV;
+
+ pcc_mbox_channels = devm_kcalloc(dev, count, sizeof(*pcc_mbox_channels),
+ GFP_KERNEL);
if (!pcc_mbox_channels) {
- pr_err("Could not allocate space for PCC mbox channels\n");
rc = -ENOMEM;
- goto err_put_pcct;
+ goto err;
}
- chan_info = kcalloc(count, sizeof(*chan_info), GFP_KERNEL);
+ chan_info = devm_kcalloc(dev, count, sizeof(*chan_info), GFP_KERNEL);
if (!chan_info) {
rc = -ENOMEM;
- goto err_free_mbox;
+ goto err;
+ }
+
+ pcc_mbox_ctrl = devm_kmalloc(dev, sizeof(*pcc_mbox_ctrl), GFP_KERNEL);
+ if (!pcc_mbox_ctrl) {
+ rc = -ENOMEM;
+ goto err;
}
/* Point to the first PCC subspace entry */
@@ -630,7 +664,7 @@ static int __init acpi_pcc_probe(void)
acpi_pcct_tbl = (struct acpi_table_pcct *) pcct_tbl;
if (acpi_pcct_tbl->flags & ACPI_PCCT_DOORBELL)
- pcc_mbox_ctrl.txdone_irq = true;
+ pcc_mbox_ctrl->txdone_irq = true;
for (i = 0; i < count; i++) {
struct pcc_chan_info *pchan = chan_info + i;
@@ -639,13 +673,13 @@ static int __init acpi_pcc_probe(void)
pchan->chan.mchan = &pcc_mbox_channels[i];
if (pcct_entry->type == ACPI_PCCT_TYPE_EXT_PCC_SLAVE_SUBSPACE &&
- !pcc_mbox_ctrl.txdone_irq) {
+ !pcc_mbox_ctrl->txdone_irq) {
pr_err("Plaform Interrupt flag must be set to 1");
rc = -EINVAL;
goto err;
}
- if (pcc_mbox_ctrl.txdone_irq) {
+ if (pcc_mbox_ctrl->txdone_irq) {
rc = pcc_parse_subspace_irq(pchan, pcct_entry);
if (rc < 0)
goto err;
@@ -660,51 +694,25 @@ static int __init acpi_pcc_probe(void)
((unsigned long) pcct_entry + pcct_entry->length);
}
- pcc_mbox_ctrl.num_chans = count;
+ pcc_mbox_ctrl->num_chans = count;
- pr_info("Detected %d PCC Subspaces\n", pcc_mbox_ctrl.num_chans);
+ pr_info("Detected %d PCC Subspaces\n", pcc_mbox_ctrl->num_chans);
- return 0;
+ pcc_mbox_ctrl->chans = pcc_mbox_channels;
+ pcc_mbox_ctrl->ops = &pcc_chan_ops;
+ pcc_mbox_ctrl->dev = dev;
+ pr_info("Registering PCC driver as Mailbox controller\n");
+ rc = mbox_controller_register(pcc_mbox_ctrl);
+ if (rc)
+ pr_err("Err registering PCC as Mailbox controller: %d\n", rc);
+ else
+ return 0;
err:
- kfree(chan_info);
-err_free_mbox:
- kfree(pcc_mbox_channels);
-err_put_pcct:
acpi_put_table(pcct_tbl);
return rc;
}
-/**
- * pcc_mbox_probe - Called when we find a match for the
- * PCCT platform device. This is purely used to represent
- * the PCCT as a virtual device for registering with the
- * generic Mailbox framework.
- *
- * @pdev: Pointer to platform device returned when a match
- * is found.
- *
- * Return: 0 for Success, else errno.
- */
-static int pcc_mbox_probe(struct platform_device *pdev)
-{
- int ret = 0;
-
- pcc_mbox_ctrl.chans = pcc_mbox_channels;
- pcc_mbox_ctrl.ops = &pcc_chan_ops;
- pcc_mbox_ctrl.dev = &pdev->dev;
-
- pr_info("Registering PCC driver as Mailbox controller\n");
- ret = mbox_controller_register(&pcc_mbox_ctrl);
-
- if (ret) {
- pr_err("Err registering PCC as Mailbox controller: %d\n", ret);
- ret = -ENODEV;
- }
-
- return ret;
-}
-
static struct platform_driver pcc_mbox_driver = {
.probe = pcc_mbox_probe,
.driver = {
--
2.25.1
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