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Message-Id: <20241029-dcd-type2-upstream-v5-14-8739cb67c374@intel.com>
Date: Tue, 29 Oct 2024 15:34:49 -0500
From: ira.weiny@...el.com
To: Dave Jiang <dave.jiang@...el.com>, Fan Ni <fan.ni@...sung.com>,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
Navneet Singh <navneet.singh@...el.com>, Jonathan Corbet <corbet@....net>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: Dan Williams <dan.j.williams@...el.com>,
Davidlohr Bueso <dave@...olabs.net>,
Alison Schofield <alison.schofield@...el.com>,
Vishal Verma <vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>,
linux-cxl@...r.kernel.org, linux-doc@...r.kernel.org,
nvdimm@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH v5 14/27] cxl/port: Add endpoint decoder DC mode support to
sysfs
From: Navneet Singh <navneet.singh@...el.com>
Endpoint decoder mode is used to represent the partition the decoder
points to such as ram or pmem.
Expand the mode to allow a decoder to point to a specific DC partition
(Region).
Signed-off-by: Navneet Singh <navneet.singh@...el.com>
Reviewed-by: Dave Jiang <dave.jiang@...el.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Co-developed-by: Ira Weiny <ira.weiny@...el.com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
Changes:
[iweiny: push sysfs versions to 6.13]
[Jonathan: adjust to the use of guard()]
[Jonathan: clean up documentation]
[Jonathan: adjust decoder mode enum]
---
Documentation/ABI/testing/sysfs-bus-cxl | 25 +++++++++++++------------
drivers/cxl/core/hdm.c | 16 ++++++++++++++++
drivers/cxl/core/port.c | 16 +++++++++++-----
drivers/cxl/cxl.h | 33 +++++++++++++++++----------------
4 files changed, 57 insertions(+), 33 deletions(-)
diff --git a/Documentation/ABI/testing/sysfs-bus-cxl b/Documentation/ABI/testing/sysfs-bus-cxl
index ff3ae83477f0876c0ee2d3955d27a11fa9d16d83..8d990d702f63363879150cf523c0be6229f315e0 100644
--- a/Documentation/ABI/testing/sysfs-bus-cxl
+++ b/Documentation/ABI/testing/sysfs-bus-cxl
@@ -361,23 +361,24 @@ Description:
What: /sys/bus/cxl/devices/decoderX.Y/mode
-Date: May, 2022
-KernelVersion: v6.0
+Date: May, 2022, October 2024
+KernelVersion: v6.0, v6.13 (dcY)
Contact: linux-cxl@...r.kernel.org
Description:
(RW) When a CXL decoder is of devtype "cxl_decoder_endpoint" it
- translates from a host physical address range, to a device local
- address range. Device-local address ranges are further split
- into a 'ram' (volatile memory) range and 'pmem' (persistent
- memory) range. The 'mode' attribute emits one of 'ram', 'pmem',
- 'mixed', or 'none'. The 'mixed' indication is for error cases
- when a decoder straddles the volatile/persistent partition
- boundary, and 'none' indicates the decoder is not actively
- decoding, or no DPA allocation policy has been set.
+ translates from a host physical address range, to a device
+ local address range. Device-local address ranges are further
+ split into a 'ram' (volatile memory) range, 'pmem' (persistent
+ memory) range, and Dynamic Capacity (DC) ranges. The 'mode'
+ attribute emits one of 'ram', 'pmem', 'dcY', 'mixed', or
+ 'none'. The 'mixed' indication is for error cases when a
+ decoder straddles partition boundaries, and 'none' indicates
+ the decoder is not actively decoding, or no DPA allocation
+ policy has been set.
'mode' can be written, when the decoder is in the 'disabled'
- state, with either 'ram' or 'pmem' to set the boundaries for the
- next allocation.
+ state, with 'ram', 'pmem', or 'dcY' to set the boundaries for
+ the next allocation.
What: /sys/bus/cxl/devices/decoderX.Y/dpa_resource
diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
index 998aed17d7e47fc18a05fb2e8cca25de0e92a6d4..40799a0ca1d7af89b9af53cc098381e83b8c7e82 100644
--- a/drivers/cxl/core/hdm.c
+++ b/drivers/cxl/core/hdm.c
@@ -548,6 +548,7 @@ int cxl_dpa_set_mode(struct cxl_endpoint_decoder *cxled,
switch (mode) {
case CXL_DECODER_RAM:
case CXL_DECODER_PMEM:
+ case CXL_DECODER_DC0 ... CXL_DECODER_DC7:
break;
default:
dev_dbg(dev, "unsupported mode: %d\n", mode);
@@ -571,6 +572,21 @@ int cxl_dpa_set_mode(struct cxl_endpoint_decoder *cxled,
return -ENXIO;
}
+ if (mode >= CXL_DECODER_DC0 && mode <= CXL_DECODER_DC7) {
+ struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlds);
+ int index;
+
+ index = dc_mode_to_region_index(mode);
+ if (!resource_size(&cxlds->dc_res[index])) {
+ dev_dbg(dev, "no available dynamic capacity\n");
+ return -ENXIO;
+ }
+ if (mds->dc_region[index].shareable) {
+ dev_err(dev, "DC region %d is shareable\n", index);
+ return -EINVAL;
+ }
+ }
+
cxled->mode = mode;
return 0;
}
diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
index 85b912c11f04d2c743936eaac1f356975cb3cc71..2f42c8717a65586c769f0fd2016e8addc2552f9d 100644
--- a/drivers/cxl/core/port.c
+++ b/drivers/cxl/core/port.c
@@ -205,11 +205,17 @@ static ssize_t mode_store(struct device *dev, struct device_attribute *attr,
enum cxl_decoder_mode mode;
ssize_t rc;
- if (sysfs_streq(buf, "pmem"))
- mode = CXL_DECODER_PMEM;
- else if (sysfs_streq(buf, "ram"))
- mode = CXL_DECODER_RAM;
- else
+ for (mode = 0; mode < CXL_DECODER_MODE_MAX; mode++)
+ if (sysfs_streq(buf, cxl_decoder_mode_names[mode]))
+ break;
+
+ if (mode == CXL_DECODER_NONE ||
+ mode == CXL_DECODER_DEAD ||
+ mode == CXL_DECODER_MODE_MAX)
+ return -EINVAL;
+
+ /* Not yet supported */
+ if (mode >= CXL_DECODER_MIXED)
return -EINVAL;
rc = cxl_dpa_set_mode(cxled, mode);
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index 8b7099c38a40d842e4f11137c3e9107031fbdf6a..486ceaafa85c3ac1efd438b6d6b9ccd0860dde45 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -380,27 +380,28 @@ enum cxl_decoder_mode {
CXL_DECODER_DC7,
CXL_DECODER_MIXED,
CXL_DECODER_DEAD,
+ CXL_DECODER_MODE_MAX,
+};
+
+static const char * const cxl_decoder_mode_names[] = {
+ [CXL_DECODER_NONE] = "none",
+ [CXL_DECODER_RAM] = "ram",
+ [CXL_DECODER_PMEM] = "pmem",
+ [CXL_DECODER_DC0] = "dc0",
+ [CXL_DECODER_DC1] = "dc1",
+ [CXL_DECODER_DC2] = "dc2",
+ [CXL_DECODER_DC3] = "dc3",
+ [CXL_DECODER_DC4] = "dc4",
+ [CXL_DECODER_DC5] = "dc5",
+ [CXL_DECODER_DC6] = "dc6",
+ [CXL_DECODER_DC7] = "dc7",
+ [CXL_DECODER_MIXED] = "mixed",
};
static inline const char *cxl_decoder_mode_name(enum cxl_decoder_mode mode)
{
- static const char * const names[] = {
- [CXL_DECODER_NONE] = "none",
- [CXL_DECODER_RAM] = "ram",
- [CXL_DECODER_PMEM] = "pmem",
- [CXL_DECODER_DC0] = "dc0",
- [CXL_DECODER_DC1] = "dc1",
- [CXL_DECODER_DC2] = "dc2",
- [CXL_DECODER_DC3] = "dc3",
- [CXL_DECODER_DC4] = "dc4",
- [CXL_DECODER_DC5] = "dc5",
- [CXL_DECODER_DC6] = "dc6",
- [CXL_DECODER_DC7] = "dc7",
- [CXL_DECODER_MIXED] = "mixed",
- };
-
if (mode >= CXL_DECODER_NONE && mode <= CXL_DECODER_MIXED)
- return names[mode];
+ return cxl_decoder_mode_names[mode];
return "mixed";
}
--
2.47.0
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