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path: root/drivers/cxl/core
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-rw-r--r--drivers/cxl/core/cdat.c8
-rw-r--r--drivers/cxl/core/core.h5
-rw-r--r--drivers/cxl/core/hdm.c21
-rw-r--r--drivers/cxl/core/region.c28
-rw-r--r--drivers/cxl/core/regs.c58
5 files changed, 83 insertions, 37 deletions
diff --git a/drivers/cxl/core/cdat.c b/drivers/cxl/core/cdat.c
index e9cd7939c407..2a1f164db98e 100644
--- a/drivers/cxl/core/cdat.c
+++ b/drivers/cxl/core/cdat.c
@@ -247,8 +247,8 @@ static void update_perf_entry(struct device *dev, struct dsmas_entry *dent,
dpa_perf->dpa_range = dent->dpa_range;
dpa_perf->qos_class = dent->qos_class;
dev_dbg(dev,
- "DSMAS: dpa: %#llx qos: %d read_bw: %d write_bw %d read_lat: %d write_lat: %d\n",
- dent->dpa_range.start, dpa_perf->qos_class,
+ "DSMAS: dpa: %pra qos: %d read_bw: %d write_bw %d read_lat: %d write_lat: %d\n",
+ &dent->dpa_range, dpa_perf->qos_class,
dent->coord[ACCESS_COORDINATE_CPU].read_bandwidth,
dent->coord[ACCESS_COORDINATE_CPU].write_bandwidth,
dent->coord[ACCESS_COORDINATE_CPU].read_latency,
@@ -279,8 +279,8 @@ static void cxl_memdev_set_qos_class(struct cxl_dev_state *cxlds,
range_contains(&pmem_range, &dent->dpa_range))
update_perf_entry(dev, dent, &mds->pmem_perf);
else
- dev_dbg(dev, "no partition for dsmas dpa: %#llx\n",
- dent->dpa_range.start);
+ dev_dbg(dev, "no partition for dsmas dpa: %pra\n",
+ &dent->dpa_range);
}
}
diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h
index 0c62b4069ba0..800466f96a68 100644
--- a/drivers/cxl/core/core.h
+++ b/drivers/cxl/core/core.h
@@ -89,6 +89,11 @@ resource_size_t __rcrb_to_component(struct device *dev,
enum cxl_rcrb which);
u16 cxl_rcrb_to_aer(struct device *dev, resource_size_t rcrb);
+#define PCI_RCRB_CAP_LIST_ID_MASK GENMASK(7, 0)
+#define PCI_RCRB_CAP_HDR_ID_MASK GENMASK(7, 0)
+#define PCI_RCRB_CAP_HDR_NEXT_MASK GENMASK(15, 8)
+#define PCI_CAP_EXP_SIZEOF 0x3c
+
extern struct rw_semaphore cxl_dpa_rwsem;
extern struct rw_semaphore cxl_region_rwsem;
diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
index 223c273c0cd1..ff0c96ade241 100644
--- a/drivers/cxl/core/hdm.c
+++ b/drivers/cxl/core/hdm.c
@@ -424,7 +424,6 @@ int cxl_dpa_set_mode(struct cxl_endpoint_decoder *cxled,
struct cxl_memdev *cxlmd = cxled_to_memdev(cxled);
struct cxl_dev_state *cxlds = cxlmd->cxlds;
struct device *dev = &cxled->cxld.dev;
- int rc;
switch (mode) {
case CXL_DECODER_RAM:
@@ -435,11 +434,9 @@ int cxl_dpa_set_mode(struct cxl_endpoint_decoder *cxled,
return -EINVAL;
}
- down_write(&cxl_dpa_rwsem);
- if (cxled->cxld.flags & CXL_DECODER_F_ENABLE) {
- rc = -EBUSY;
- goto out;
- }
+ guard(rwsem_write)(&cxl_dpa_rwsem);
+ if (cxled->cxld.flags & CXL_DECODER_F_ENABLE)
+ return -EBUSY;
/*
* Only allow modes that are supported by the current partition
@@ -447,21 +444,15 @@ int cxl_dpa_set_mode(struct cxl_endpoint_decoder *cxled,
*/
if (mode == CXL_DECODER_PMEM && !resource_size(&cxlds->pmem_res)) {
dev_dbg(dev, "no available pmem capacity\n");
- rc = -ENXIO;
- goto out;
+ return -ENXIO;
}
if (mode == CXL_DECODER_RAM && !resource_size(&cxlds->ram_res)) {
dev_dbg(dev, "no available ram capacity\n");
- rc = -ENXIO;
- goto out;
+ return -ENXIO;
}
cxled->mode = mode;
- rc = 0;
-out:
- up_write(&cxl_dpa_rwsem);
-
- return rc;
+ return 0;
}
int cxl_dpa_alloc(struct cxl_endpoint_decoder *cxled, unsigned long long size)
diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index dff618c708dc..70d0a017e99c 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -2537,9 +2537,8 @@ static struct cxl_region *__create_region(struct cxl_root_decoder *cxlrd,
return devm_cxl_add_region(cxlrd, id, mode, CXL_DECODER_HOSTONLYMEM);
}
-static ssize_t create_pmem_region_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t len)
+static ssize_t create_region_store(struct device *dev, const char *buf,
+ size_t len, enum cxl_decoder_mode mode)
{
struct cxl_root_decoder *cxlrd = to_cxl_root_decoder(dev);
struct cxl_region *cxlr;
@@ -2549,31 +2548,26 @@ static ssize_t create_pmem_region_store(struct device *dev,
if (rc != 1)
return -EINVAL;
- cxlr = __create_region(cxlrd, CXL_DECODER_PMEM, id);
+ cxlr = __create_region(cxlrd, mode, id);
if (IS_ERR(cxlr))
return PTR_ERR(cxlr);
return len;
}
+
+static ssize_t create_pmem_region_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ return create_region_store(dev, buf, len, CXL_DECODER_PMEM);
+}
DEVICE_ATTR_RW(create_pmem_region);
static ssize_t create_ram_region_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
- struct cxl_root_decoder *cxlrd = to_cxl_root_decoder(dev);
- struct cxl_region *cxlr;
- int rc, id;
-
- rc = sscanf(buf, "region%d\n", &id);
- if (rc != 1)
- return -EINVAL;
-
- cxlr = __create_region(cxlrd, CXL_DECODER_RAM, id);
- if (IS_ERR(cxlr))
- return PTR_ERR(cxlr);
-
- return len;
+ return create_region_store(dev, buf, len, CXL_DECODER_RAM);
}
DEVICE_ATTR_RW(create_ram_region);
diff --git a/drivers/cxl/core/regs.c b/drivers/cxl/core/regs.c
index e1082e749c69..429973a2165b 100644
--- a/drivers/cxl/core/regs.c
+++ b/drivers/cxl/core/regs.c
@@ -52,7 +52,7 @@ void cxl_probe_component_regs(struct device *dev, void __iomem *base,
cap_array = readl(base + CXL_CM_CAP_HDR_OFFSET);
if (FIELD_GET(CXL_CM_CAP_HDR_ID_MASK, cap_array) != CM_CAP_HDR_CAP_ID) {
- dev_err(dev,
+ dev_dbg(dev,
"Couldn't locate the CXL.cache and CXL.mem capability array header.\n");
return;
}
@@ -506,6 +506,62 @@ out:
return offset;
}
+static resource_size_t cxl_rcrb_to_linkcap(struct device *dev, struct cxl_dport *dport)
+{
+ resource_size_t rcrb = dport->rcrb.base;
+ void __iomem *addr;
+ u32 cap_hdr;
+ u16 offset;
+
+ if (!request_mem_region(rcrb, SZ_4K, "CXL RCRB"))
+ return CXL_RESOURCE_NONE;
+
+ addr = ioremap(rcrb, SZ_4K);
+ if (!addr) {
+ dev_err(dev, "Failed to map region %pr\n", addr);
+ release_mem_region(rcrb, SZ_4K);
+ return CXL_RESOURCE_NONE;
+ }
+
+ offset = FIELD_GET(PCI_RCRB_CAP_LIST_ID_MASK, readw(addr + PCI_CAPABILITY_LIST));
+ cap_hdr = readl(addr + offset);
+ while ((FIELD_GET(PCI_RCRB_CAP_HDR_ID_MASK, cap_hdr)) != PCI_CAP_ID_EXP) {
+ offset = FIELD_GET(PCI_RCRB_CAP_HDR_NEXT_MASK, cap_hdr);
+ if (offset == 0 || offset > SZ_4K) {
+ offset = 0;
+ break;
+ }
+ cap_hdr = readl(addr + offset);
+ }
+
+ iounmap(addr);
+ release_mem_region(rcrb, SZ_4K);
+ if (!offset)
+ return CXL_RESOURCE_NONE;
+
+ return offset;
+}
+
+int cxl_dport_map_rcd_linkcap(struct pci_dev *pdev, struct cxl_dport *dport)
+{
+ void __iomem *dport_pcie_cap = NULL;
+ resource_size_t pos;
+ struct cxl_rcrb_info *ri;
+
+ ri = &dport->rcrb;
+ pos = cxl_rcrb_to_linkcap(&pdev->dev, dport);
+ if (pos == CXL_RESOURCE_NONE)
+ return -ENXIO;
+
+ dport_pcie_cap = devm_cxl_iomap_block(&pdev->dev,
+ ri->base + pos,
+ PCI_CAP_EXP_SIZEOF);
+ dport->regs.rcd_pcie_cap = dport_pcie_cap;
+
+ return 0;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_dport_map_rcd_linkcap, CXL);
+
resource_size_t __rcrb_to_component(struct device *dev, struct cxl_rcrb_info *ri,
enum cxl_rcrb which)
{
generated by cgit (git 2.34.1) at 2025-06-03 14:33:32 +0000