[PATCH v5 1/2] scsi: mpt3sas: add IO Unit Page 7 config accessor

[Louis Sautier <sautier.louis@gmail.com>]

Add mpt3sas_config_get_iounit_pg7(), mirroring the existing iounit
page accessors. Used by the hwmon driver added in the following patch
to read the IOC and board temperatures.

Assisted-by: Claude:claude-opus-4-7
Signed-off-by: Louis Sautier <sautier.louis@gmail.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
---
 drivers/scsi/mpt3sas/mpt3sas_base.h   |  3 +++
 drivers/scsi/mpt3sas/mpt3sas_config.c | 36 +++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.h b/drivers/scsi/mpt3sas/mpt3sas_base.h
index d4597d058705..fe21b0425047 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.h
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.h
@@ -1904,6 +1904,9 @@ int mpt3sas_config_get_iounit_pg3(struct MPT3SAS_ADAPTER *ioc,
 	Mpi2ConfigReply_t *mpi_reply, Mpi2IOUnitPage3_t *config_page, u16 sz);
 int mpt3sas_config_set_iounit_pg1(struct MPT3SAS_ADAPTER *ioc, Mpi2ConfigReply_t
 	*mpi_reply, Mpi2IOUnitPage1_t *config_page);
+int mpt3sas_config_get_iounit_pg7(struct MPT3SAS_ADAPTER *ioc,
+				  Mpi2ConfigReply_t *mpi_reply,
+				  Mpi2IOUnitPage7_t *config_page);
 int mpt3sas_config_get_iounit_pg8(struct MPT3SAS_ADAPTER *ioc, Mpi2ConfigReply_t
 	*mpi_reply, Mpi2IOUnitPage8_t *config_page);
 int mpt3sas_config_get_sas_iounit_pg1(struct MPT3SAS_ADAPTER *ioc,
diff --git a/drivers/scsi/mpt3sas/mpt3sas_config.c b/drivers/scsi/mpt3sas/mpt3sas_config.c
index 45ac853e1289..b0d5ef893600 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_config.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_config.c
@@ -991,6 +991,42 @@ mpt3sas_config_get_iounit_pg3(struct MPT3SAS_ADAPTER *ioc,
 	return r;
 }
 
+/**
+ * mpt3sas_config_get_iounit_pg7 - obtain iounit page 7
+ * @ioc: per adapter object
+ * @mpi_reply: reply mf payload returned from firmware
+ * @config_page: contents of the config page
+ * Context: sleep.
+ *
+ * Return: 0 for success, non-zero for failure.
+ */
+int mpt3sas_config_get_iounit_pg7(struct MPT3SAS_ADAPTER *ioc,
+				  Mpi2ConfigReply_t *mpi_reply,
+				  Mpi2IOUnitPage7_t *config_page)
+{
+	Mpi2ConfigRequest_t mpi_request;
+	int r;
+
+	memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
+	mpi_request.Function = MPI2_FUNCTION_CONFIG;
+	mpi_request.Action = MPI2_CONFIG_ACTION_PAGE_HEADER;
+	mpi_request.Header.PageType = MPI2_CONFIG_PAGETYPE_IO_UNIT;
+	mpi_request.Header.PageNumber = 7;
+	mpi_request.Header.PageVersion = MPI2_IOUNITPAGE7_PAGEVERSION;
+	ioc->build_zero_len_sge_mpi(ioc, &mpi_request.PageBufferSGE);
+	r = _config_request(ioc, &mpi_request, mpi_reply,
+			    MPT3_CONFIG_PAGE_DEFAULT_TIMEOUT, NULL, 0);
+	if (r)
+		goto out;
+
+	mpi_request.Action = MPI2_CONFIG_ACTION_PAGE_READ_CURRENT;
+	r = _config_request(ioc, &mpi_request, mpi_reply,
+			    MPT3_CONFIG_PAGE_DEFAULT_TIMEOUT,
+			    config_page, sizeof(*config_page));
+ out:
+	return r;
+}
+
 /**
  * mpt3sas_config_get_iounit_pg8 - obtain iounit page 8
  * @ioc: per adapter object
-- 
2.54.0