linux-kernel - [PATCH v2 07/13] mailbox: pcc: Always map the shared memory communication address

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Message-Id: <20250305-pcc_fixes_updates-v2-7-1b1822bc8746@arm.com>
Date: Wed, 05 Mar 2025 16:38:11 +0000
From: Sudeep Holla <sudeep.holla@....com>
To: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Sudeep Holla <sudeep.holla@....com>, 
 Jassi Brar <jassisinghbrar@...il.com>, Huisong Li <lihuisong@...wei.com>, 
 Adam Young <admiyo@...amperecomputing.com>, 
 Robbie King <robbiek@...ghtlabs.com>
Subject: [PATCH v2 07/13] mailbox: pcc: Always map the shared memory
 communication address

Currently the shared memory communication address was mapped by the
mailbox client drivers leading to all sorts of inconsistencies.

It also has resulted in the inconsistent attributes used while mapping
the shared memory regions.

In order to remove/eliminate any issues, let us ensures the shared
memory address is always mapped and unmapped when the PCC channels are
requested and release.

We need to map them as the ACPI PCCT associates these shared memory
with each channel subspace and may need use the status or the flags in
the headers of those shared memory communication address regions to
manage the transport/channel.

Since there are no users of pcc_chan_ioremap() and also it is mapped
by default, we can stop exporting it and merge the functionality into
pcc_mbox_request_channel().

Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
 drivers/mailbox/pcc.c | 29 +++++++++--------------------
 include/acpi/pcc.h    |  5 -----
 2 files changed, 9 insertions(+), 25 deletions(-)

diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c
index 41bd14851216e8c4f03052c81aaf938a5e5c5343..b3d133170aac7f8acfd1999564c69b7fe4f6d582 100644
--- a/drivers/mailbox/pcc.c
+++ b/drivers/mailbox/pcc.c
@@ -372,6 +372,7 @@ static irqreturn_t pcc_mbox_irq(int irq, void *p)
 struct pcc_mbox_chan *
 pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
 {
+	struct pcc_mbox_chan *pcc_mchan;
 	struct pcc_chan_info *pchan;
 	struct mbox_chan *chan;
 	int rc;
@@ -390,7 +391,14 @@ pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
 	if (rc)
 		return ERR_PTR(rc);
 
-	return &pchan->chan;
+	pcc_mchan = &pchan->chan;
+	pcc_mchan->shmem = acpi_os_ioremap(pcc_mchan->shmem_base_addr,
+					   pcc_mchan->shmem_size);
+	if (pcc_mchan->shmem)
+		return pcc_mchan;
+
+	mbox_free_channel(chan);
+	return ERR_PTR(-ENXIO);
 }
 EXPORT_SYMBOL_GPL(pcc_mbox_request_channel);
 
@@ -419,25 +427,6 @@ void pcc_mbox_free_channel(struct pcc_mbox_chan *pchan)
 }
 EXPORT_SYMBOL_GPL(pcc_mbox_free_channel);
 
-int pcc_mbox_ioremap(struct mbox_chan *chan)
-{
-	struct pcc_chan_info *pchan_info;
-	struct pcc_mbox_chan *pcc_mbox_chan;
-
-	if (!chan || !chan->cl)
-		return -1;
-	pchan_info = chan->con_priv;
-	pcc_mbox_chan = &pchan_info->chan;
-
-	pcc_mbox_chan->shmem = acpi_os_ioremap(pcc_mbox_chan->shmem_base_addr,
-					       pcc_mbox_chan->shmem_size);
-	if (!pcc_mbox_chan->shmem)
-		return -ENXIO;
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(pcc_mbox_ioremap);
-
 /**
  * pcc_send_data - Called from Mailbox Controller code. Used
  *		here only to ring the channel doorbell. The PCC client
diff --git a/include/acpi/pcc.h b/include/acpi/pcc.h
index d1e506f041c5a80857d4a025fa3c1803746ba4b9..840bfc95bae3329605da5f66cf37b7d2ca183f48 100644
--- a/include/acpi/pcc.h
+++ b/include/acpi/pcc.h
@@ -37,7 +37,6 @@ struct pcc_mbox_chan {
 extern struct pcc_mbox_chan *
 pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id);
 extern void pcc_mbox_free_channel(struct pcc_mbox_chan *chan);
-extern int pcc_mbox_ioremap(struct mbox_chan *chan);
 #else
 static inline struct pcc_mbox_chan *
 pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
@@ -45,10 +44,6 @@ pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
 	return ERR_PTR(-ENODEV);
 }
 static inline void pcc_mbox_free_channel(struct pcc_mbox_chan *chan) { }
-static inline int pcc_mbox_ioremap(struct mbox_chan *chan)
-{
-	return 0;
-};
 #endif
 
 #endif /* _PCC_H */

-- 
2.34.1