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Message-ID: <20250413-dcd-type2-upstream-v9-4-1d4911a0b365@intel.com>
Date: Sun, 13 Apr 2025 17:52:12 -0500
From: Ira Weiny <ira.weiny@...el.com>
To: Dave Jiang <dave.jiang@...el.com>, Fan Ni <fan.ni@...sung.com>, "Jonathan
Cameron" <Jonathan.Cameron@...wei.com>
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>, <nvdimm@...ts.linux.dev>,
<linux-kernel@...r.kernel.org>
Subject: [PATCH v9 04/19] cxl/core: Enforce partition order/simplify
partition calls
Device partitions have an implied order which is made more complex by
the addition of a dynamic partition.
Remove the ram special case information calls in favor of generic calls
with a check ahead of time to ensure the preservation of the implied
partition order.
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
drivers/cxl/core/hdm.c | 11 ++++++++++-
drivers/cxl/core/memdev.c | 32 +++++++++-----------------------
drivers/cxl/cxl.h | 1 +
drivers/cxl/cxlmem.h | 9 +++------
drivers/cxl/mem.c | 2 +-
5 files changed, 24 insertions(+), 31 deletions(-)
diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
index c5f8a17d00f1..92e1a24e2109 100644
--- a/drivers/cxl/core/hdm.c
+++ b/drivers/cxl/core/hdm.c
@@ -470,6 +470,7 @@ static const char *cxl_mode_name(enum cxl_partition_mode mode)
int cxl_dpa_setup(struct cxl_dev_state *cxlds, const struct cxl_dpa_info *info)
{
struct device *dev = cxlds->dev;
+ int i;
guard(rwsem_write)(&cxl_dpa_rwsem);
@@ -482,9 +483,17 @@ int cxl_dpa_setup(struct cxl_dev_state *cxlds, const struct cxl_dpa_info *info)
return 0;
}
+ /* Verify partitions are in expected order. */
+ for (i = 1; i < info->nr_partitions; i++) {
+ if (cxlds->part[i].mode < cxlds->part[i-1].mode) {
+ dev_err(dev, "Partition order mismatch\n");
+ return 0;
+ }
+ }
+
cxlds->dpa_res = DEFINE_RES_MEM(0, info->size);
- for (int i = 0; i < info->nr_partitions; i++) {
+ for (i = 0; i < info->nr_partitions; i++) {
const struct cxl_dpa_part_info *part = &info->part[i];
int rc;
diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
index a16a5886d40a..9d6f8800e37a 100644
--- a/drivers/cxl/core/memdev.c
+++ b/drivers/cxl/core/memdev.c
@@ -75,20 +75,12 @@ static ssize_t label_storage_size_show(struct device *dev,
}
static DEVICE_ATTR_RO(label_storage_size);
-static resource_size_t cxl_ram_size(struct cxl_dev_state *cxlds)
-{
- /* Static RAM is only expected at partition 0. */
- if (cxlds->part[0].mode != CXL_PARTMODE_RAM)
- return 0;
- return resource_size(&cxlds->part[0].res);
-}
-
static ssize_t ram_size_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct cxl_memdev *cxlmd = to_cxl_memdev(dev);
struct cxl_dev_state *cxlds = cxlmd->cxlds;
- unsigned long long len = cxl_ram_size(cxlds);
+ unsigned long long len = cxl_part_size(cxlds, CXL_PARTMODE_RAM);
return sysfs_emit(buf, "%#llx\n", len);
}
@@ -101,7 +93,7 @@ static ssize_t pmem_size_show(struct device *dev, struct device_attribute *attr,
{
struct cxl_memdev *cxlmd = to_cxl_memdev(dev);
struct cxl_dev_state *cxlds = cxlmd->cxlds;
- unsigned long long len = cxl_pmem_size(cxlds);
+ unsigned long long len = cxl_part_size(cxlds, CXL_PARTMODE_PMEM);
return sysfs_emit(buf, "%#llx\n", len);
}
@@ -407,10 +399,11 @@ static struct attribute *cxl_memdev_attributes[] = {
NULL,
};
-static struct cxl_dpa_perf *to_pmem_perf(struct cxl_dev_state *cxlds)
+static struct cxl_dpa_perf *part_perf(struct cxl_dev_state *cxlds,
+ enum cxl_partition_mode mode)
{
for (int i = 0; i < cxlds->nr_partitions; i++)
- if (cxlds->part[i].mode == CXL_PARTMODE_PMEM)
+ if (cxlds->part[i].mode == mode)
return &cxlds->part[i].perf;
return NULL;
}
@@ -421,7 +414,7 @@ static ssize_t pmem_qos_class_show(struct device *dev,
struct cxl_memdev *cxlmd = to_cxl_memdev(dev);
struct cxl_dev_state *cxlds = cxlmd->cxlds;
- return sysfs_emit(buf, "%d\n", to_pmem_perf(cxlds)->qos_class);
+ return sysfs_emit(buf, "%d\n", part_perf(cxlds, CXL_PARTMODE_PMEM)->qos_class);
}
static struct device_attribute dev_attr_pmem_qos_class =
@@ -433,20 +426,13 @@ static struct attribute *cxl_memdev_pmem_attributes[] = {
NULL,
};
-static struct cxl_dpa_perf *to_ram_perf(struct cxl_dev_state *cxlds)
-{
- if (cxlds->part[0].mode != CXL_PARTMODE_RAM)
- return NULL;
- return &cxlds->part[0].perf;
-}
-
static ssize_t ram_qos_class_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct cxl_memdev *cxlmd = to_cxl_memdev(dev);
struct cxl_dev_state *cxlds = cxlmd->cxlds;
- return sysfs_emit(buf, "%d\n", to_ram_perf(cxlds)->qos_class);
+ return sysfs_emit(buf, "%d\n", part_perf(cxlds, CXL_PARTMODE_RAM)->qos_class);
}
static struct device_attribute dev_attr_ram_qos_class =
@@ -482,7 +468,7 @@ static umode_t cxl_ram_visible(struct kobject *kobj, struct attribute *a, int n)
{
struct device *dev = kobj_to_dev(kobj);
struct cxl_memdev *cxlmd = to_cxl_memdev(dev);
- struct cxl_dpa_perf *perf = to_ram_perf(cxlmd->cxlds);
+ struct cxl_dpa_perf *perf = part_perf(cxlmd->cxlds, CXL_PARTMODE_RAM);
if (a == &dev_attr_ram_qos_class.attr &&
(!perf || perf->qos_class == CXL_QOS_CLASS_INVALID))
@@ -501,7 +487,7 @@ static umode_t cxl_pmem_visible(struct kobject *kobj, struct attribute *a, int n
{
struct device *dev = kobj_to_dev(kobj);
struct cxl_memdev *cxlmd = to_cxl_memdev(dev);
- struct cxl_dpa_perf *perf = to_pmem_perf(cxlmd->cxlds);
+ struct cxl_dpa_perf *perf = part_perf(cxlmd->cxlds, CXL_PARTMODE_PMEM);
if (a == &dev_attr_pmem_qos_class.attr &&
(!perf || perf->qos_class == CXL_QOS_CLASS_INVALID))
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index a9d42210e8a3..4bb0ff4d8f5f 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -482,6 +482,7 @@ struct cxl_region_params {
resource_size_t cache_size;
};
+/* Modes should be in the implied DPA order */
enum cxl_partition_mode {
CXL_PARTMODE_RAM,
CXL_PARTMODE_PMEM,
diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
index 96d8edaa5003..a74ac2d70d8d 100644
--- a/drivers/cxl/cxlmem.h
+++ b/drivers/cxl/cxlmem.h
@@ -453,14 +453,11 @@ struct cxl_dev_state {
#endif
};
-static inline resource_size_t cxl_pmem_size(struct cxl_dev_state *cxlds)
+static inline resource_size_t cxl_part_size(struct cxl_dev_state *cxlds,
+ enum cxl_partition_mode mode)
{
- /*
- * Static PMEM may be at partition index 0 when there is no static RAM
- * capacity.
- */
for (int i = 0; i < cxlds->nr_partitions; i++)
- if (cxlds->part[i].mode == CXL_PARTMODE_PMEM)
+ if (cxlds->part[i].mode == mode)
return resource_size(&cxlds->part[i].res);
return 0;
}
diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c
index 9675243bd05b..b58b915708f9 100644
--- a/drivers/cxl/mem.c
+++ b/drivers/cxl/mem.c
@@ -152,7 +152,7 @@ static int cxl_mem_probe(struct device *dev)
return -ENXIO;
}
- if (cxl_pmem_size(cxlds) && IS_ENABLED(CONFIG_CXL_PMEM)) {
+ if (cxl_part_size(cxlds, CXL_PARTMODE_PMEM) && IS_ENABLED(CONFIG_CXL_PMEM)) {
rc = devm_cxl_add_nvdimm(parent_port, cxlmd);
if (rc) {
if (rc == -ENODEV)
--
2.49.0
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