[SCSI] mpt2sas: Added phy_enable and set_phy_speed sysfs callback support.

Added new callbacks phy_enable and set_phy_speed in the
mpt2sas_transport_functions template. This will allow end user to
enable/disable phys and change links rates using the SysFS interface.
Current implementation only supports direct attached phys, but we
could in the future add support for expander based phys.
A new subroutine mpt2sas_config_set_sas_iounit_pg1 was added;
this wrapper function used to send request to controller firmware to modify
the phys and link rates. A new subroutine _transport_find_local_phy was added;
a function for easly obtaining the local phy object for direct attached.

Example to disable a phy
echo 0 > /sys/class/phy3:0/enable

Example to enable the same phy
echo 1 > /sys/class/phy3:0/enable

Example to change the link rate to 1.5
#echo "1.5 Gbit" > /sys/class/phy3:0/maximum_linkrate
#cat /sys/class/phy3:0/negotiated_linkrate
1.5 Gbit

Example to change the link rate to 3.0
#echo "3.0 Gbit" > /sys/class/phy3:0/maximum_linkrate
#cat /sys/class/phy3:0/negotiated_linkrate
3.0 Gbit

Example to change the link rate to 6.0
#echo "6.0 Gbit" > /sys/class/phy3:0/maximum_linkrate
#cat /sys/class/phy3:0/negotiated_linkrate
6.0 Gbit

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Reviewed-by: Eric Moore <eric.moore@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 48 insertions, 3 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_config.c b/drivers/scsi/mpt2sas/mpt2sas_config.c
index 594a389c6526..411c27d7f787 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_config.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_config.c
@@ -324,7 +324,9 @@ _config_request(struct MPT2SAS_ADAPTER *ioc, Mpi2ConfigRequest_t
                 if (r != 0)
                         goto out;
                 if (mpi_request->Action ==
-                    MPI2_CONFIG_ACTION_PAGE_WRITE_CURRENT) {
+                    MPI2_CONFIG_ACTION_PAGE_WRITE_CURRENT ||
+                    mpi_request->Action ==
+                    MPI2_CONFIG_ACTION_PAGE_WRITE_NVRAM) {
                         ioc->base_add_sg_single(&mpi_request->PageBufferSGE,
                             MPT2_CONFIG_COMMON_WRITE_SGLFLAGS | mem.sz,
                             mem.page_dma);
@@ -882,7 +884,7 @@ mpt2sas_config_get_sas_iounit_pg0(struct MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
 }
 
 /**
- * mpt2sas_config_get_sas_iounit_pg1 - obtain sas iounit page 0
+ * mpt2sas_config_get_sas_iounit_pg1 - obtain sas iounit page 1
  * @ioc: per adapter object
  * @mpi_reply: reply mf payload returned from firmware
  * @config_page: contents of the config page
@@ -907,7 +909,7 @@ mpt2sas_config_get_sas_iounit_pg1(struct MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
         mpi_request.Header.PageType = MPI2_CONFIG_PAGETYPE_EXTENDED;
         mpi_request.ExtPageType = MPI2_CONFIG_EXTPAGETYPE_SAS_IO_UNIT;
         mpi_request.Header.PageNumber = 1;
-        mpi_request.Header.PageVersion = MPI2_SASIOUNITPAGE0_PAGEVERSION;
+        mpi_request.Header.PageVersion = MPI2_SASIOUNITPAGE1_PAGEVERSION;
         mpt2sas_base_build_zero_len_sge(ioc, &mpi_request.PageBufferSGE);
         r = _config_request(ioc, &mpi_request, mpi_reply,
             MPT2_CONFIG_PAGE_DEFAULT_TIMEOUT, NULL, 0);
@@ -922,6 +924,49 @@ mpt2sas_config_get_sas_iounit_pg1(struct MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
 }
 
 /**
+ * mpt2sas_config_set_sas_iounit_pg1 - send sas iounit page 1
+ * @ioc: per adapter object
+ * @mpi_reply: reply mf payload returned from firmware
+ * @config_page: contents of the config page
+ * @sz: size of buffer passed in config_page
+ * Context: sleep.
+ *
+ * Calling function should call config_get_number_hba_phys prior to
+ * this function, so enough memory is allocated for config_page.
+ *
+ * Returns 0 for success, non-zero for failure.
+ */
+int
+mpt2sas_config_set_sas_iounit_pg1(struct MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
+    *mpi_reply, Mpi2SasIOUnitPage1_t *config_page, u16 sz)
+{
+        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_EXTENDED;
+        mpi_request.ExtPageType = MPI2_CONFIG_EXTPAGETYPE_SAS_IO_UNIT;
+        mpi_request.Header.PageNumber = 1;
+        mpi_request.Header.PageVersion = MPI2_SASIOUNITPAGE1_PAGEVERSION;
+        mpt2sas_base_build_zero_len_sge(ioc, &mpi_request.PageBufferSGE);
+        r = _config_request(ioc, &mpi_request, mpi_reply,
+            MPT2_CONFIG_PAGE_DEFAULT_TIMEOUT, NULL, 0);
+        if (r)
+                goto out;
+
+        mpi_request.Action = MPI2_CONFIG_ACTION_PAGE_WRITE_CURRENT;
+        _config_request(ioc, &mpi_request, mpi_reply,
+            MPT2_CONFIG_PAGE_DEFAULT_TIMEOUT, config_page, sz);
+        mpi_request.Action = MPI2_CONFIG_ACTION_PAGE_WRITE_NVRAM;
+        r = _config_request(ioc, &mpi_request, mpi_reply,
+            MPT2_CONFIG_PAGE_DEFAULT_TIMEOUT, config_page, sz);
+ out:
+        return r;
+}
+
+/**
  * mpt2sas_config_get_expander_pg0 - obtain expander page 0
  * @ioc: per adapter object
  * @mpi_reply: reply mf payload returned from firmware