[PATCH ndctl 1/5] cxl/memdev.c: allow filtering memdevs by bus

[Vishal Verma <vishal.l.verma@intel.com>]

The family of memdev based commands implemented in memdev.c lacked an
option to filter the operation by bus. Add a helper to filter memdevs by
the bus they're under, and use it in memdev_action() which loops through
the requested memdevs. Update the man pages for all the affected
commands as well to include the bus filter option.

Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Alison Schofield <alison.schofield@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
---
 Documentation/cxl/cxl-disable-memdev.txt |  2 ++
 Documentation/cxl/cxl-enable-memdev.txt  |  2 ++
 Documentation/cxl/cxl-free-dpa.txt       |  2 ++
 Documentation/cxl/cxl-read-labels.txt    |  2 ++
 Documentation/cxl/cxl-reserve-dpa.txt    |  2 ++
 Documentation/cxl/cxl-set-partition.txt  |  2 ++
 Documentation/cxl/cxl-write-labels.txt   |  3 +++
 cxl/filter.h                             |  2 ++
 cxl/filter.c                             | 19 +++++++++++++++++++
 cxl/memdev.c                             |  4 ++++
 10 files changed, 40 insertions(+)

diff --git a/Documentation/cxl/cxl-disable-memdev.txt b/Documentation/cxl/cxl-disable-memdev.txt
index edd5385..d397802 100644
--- a/Documentation/cxl/cxl-disable-memdev.txt
+++ b/Documentation/cxl/cxl-disable-memdev.txt
@@ -18,6 +18,8 @@ OPTIONS
 <memory device(s)>::
 include::memdev-option.txt[]
 
+include::bus-option.txt[]
+
 -f::
 --force::
 	DANGEROUS: Override the safety measure that blocks attempts to disable
diff --git a/Documentation/cxl/cxl-enable-memdev.txt b/Documentation/cxl/cxl-enable-memdev.txt
index 088d5e0..5b5ed66 100644
--- a/Documentation/cxl/cxl-enable-memdev.txt
+++ b/Documentation/cxl/cxl-enable-memdev.txt
@@ -23,6 +23,8 @@ OPTIONS
 <memory device(s)>::
 include::memdev-option.txt[]
 
+include::bus-option.txt[]
+
 -v::
 	Turn on verbose debug messages in the library (if libcxl was built with
 	logging and debug enabled).
diff --git a/Documentation/cxl/cxl-free-dpa.txt b/Documentation/cxl/cxl-free-dpa.txt
index 73fb048..506fafd 100644
--- a/Documentation/cxl/cxl-free-dpa.txt
+++ b/Documentation/cxl/cxl-free-dpa.txt
@@ -24,6 +24,8 @@ OPTIONS
 <memory device(s)>::
 include::memdev-option.txt[]
 
+include::bus-option.txt[]
+
 -d::
 --decoder::
 	Specify the decoder to free. The CXL specification
diff --git a/Documentation/cxl/cxl-read-labels.txt b/Documentation/cxl/cxl-read-labels.txt
index 143f296..a96e7a4 100644
--- a/Documentation/cxl/cxl-read-labels.txt
+++ b/Documentation/cxl/cxl-read-labels.txt
@@ -20,6 +20,8 @@ OPTIONS
 -------
 include::labels-options.txt[]
 
+include::bus-option.txt[]
+
 -o::
 --output::
 	output file
diff --git a/Documentation/cxl/cxl-reserve-dpa.txt b/Documentation/cxl/cxl-reserve-dpa.txt
index 5e79ef2..58cc93e 100644
--- a/Documentation/cxl/cxl-reserve-dpa.txt
+++ b/Documentation/cxl/cxl-reserve-dpa.txt
@@ -24,6 +24,8 @@ OPTIONS
 <memory device(s)>::
 include::memdev-option.txt[]
 
+include::bus-option.txt[]
+
 -d::
 --decoder::
 	Specify the decoder to attempt the allocation. The CXL specification
diff --git a/Documentation/cxl/cxl-set-partition.txt b/Documentation/cxl/cxl-set-partition.txt
index f0126da..bed7f76 100644
--- a/Documentation/cxl/cxl-set-partition.txt
+++ b/Documentation/cxl/cxl-set-partition.txt
@@ -35,6 +35,8 @@ OPTIONS
 <memory device(s)>::
 include::memdev-option.txt[]
 
+include::bus-option.txt[]
+
 -t::
 --type=::
 	Type of partition, 'pmem' or 'ram' (volatile), to modify.
diff --git a/Documentation/cxl/cxl-write-labels.txt b/Documentation/cxl/cxl-write-labels.txt
index 75f42a5..8f2d139 100644
--- a/Documentation/cxl/cxl-write-labels.txt
+++ b/Documentation/cxl/cxl-write-labels.txt
@@ -21,6 +21,9 @@ not allow write access to the device's label data area.
 OPTIONS
 -------
 include::labels-options.txt[]
+
+include::bus-option.txt[]
+
 -i::
 --input::
 	input file
diff --git a/cxl/filter.h b/cxl/filter.h
index c486514..595cde7 100644
--- a/cxl/filter.h
+++ b/cxl/filter.h
@@ -36,6 +36,8 @@ struct cxl_filter_params {
 struct cxl_memdev *util_cxl_memdev_filter(struct cxl_memdev *memdev,
 					  const char *__ident,
 					  const char *serials);
+struct cxl_memdev *util_cxl_memdev_filter_by_bus(struct cxl_memdev *memdev,
+						 const char *__ident);
 struct cxl_port *util_cxl_port_filter_by_memdev(struct cxl_port *port,
 						const char *ident,
 						const char *serial);
diff --git a/cxl/filter.c b/cxl/filter.c
index 90b13be..d2ab899 100644
--- a/cxl/filter.c
+++ b/cxl/filter.c
@@ -243,6 +243,25 @@ static struct cxl_port *util_cxl_port_filter_by_bus(struct cxl_port *port,
 	return NULL;
 }
 
+struct cxl_memdev *util_cxl_memdev_filter_by_bus(struct cxl_memdev *memdev,
+						 const char *__ident)
+{
+	struct cxl_ctx *ctx = cxl_memdev_get_ctx(memdev);
+	struct cxl_bus *bus;
+
+	if (!__ident)
+		return memdev;
+
+	cxl_bus_foreach(ctx, bus) {
+		if (!util_cxl_bus_filter(bus, __ident))
+			continue;
+		if (bus == cxl_memdev_get_bus(memdev))
+			return memdev;
+	}
+
+	return NULL;
+}
+
 static struct cxl_decoder *
 util_cxl_decoder_filter_by_bus(struct cxl_decoder *decoder, const char *__ident)
 {
diff --git a/cxl/memdev.c b/cxl/memdev.c
index 0b3ad02..807e859 100644
--- a/cxl/memdev.c
+++ b/cxl/memdev.c
@@ -44,6 +44,8 @@ enum cxl_setpart_type {
 };
 
 #define BASE_OPTIONS() \
+OPT_STRING('b', "bus", &param.bus, "bus name", \
+	   "Limit operation to the specified bus"), \
 OPT_BOOLEAN('v',"verbose", &param.verbose, "turn on debug"), \
 OPT_BOOLEAN('S', "serial", &param.serial, "use serial numbers to id memdevs")
 
@@ -753,6 +755,8 @@ static int memdev_action(int argc, const char **argv, struct cxl_ctx *ctx,
 			if (!util_cxl_memdev_filter(memdev, memdev_filter,
 						    serial_filter))
 				continue;
+			if (!util_cxl_memdev_filter_by_bus(memdev, param.bus))
+				continue;
 			found = true;
 
 			if (action == action_write) {

-- 
2.40.0