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authorDave Jiang <dave.jiang@intel.com>2023-12-21 23:03:26 +0100
committerDan Williams <dan.j.williams@intel.com>2023-12-22 23:33:28 +0100
commit80aa780dda20618be76162bf991d49cf962fda38 (patch)
treea37679f09afb8fa8af2ff7d49c35d0f0e137457f /drivers/cxl
parentcxl: Add callback to parse the DSLBIS subtable from CDAT (diff)
downloadlinux-80aa780dda20618be76162bf991d49cf962fda38.tar.xz
linux-80aa780dda20618be76162bf991d49cf962fda38.zip
cxl: Add callback to parse the SSLBIS subtable from CDAT
Provide a callback to parse the Switched Scoped Latency and Bandwidth Information Structure (SSLBIS) in the CDAT structures. The SSLBIS contains the bandwidth and latency information that's tied to the CXL switch that the data table has been read from. The extracted values are stored to the cxl_dport correlated by the port_id depending on the SSLBIS entry. Coherent Device Attribute Table 1.03 2.1 Switched Scoped Latency and Bandwidth Information Structure (DSLBIS) Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Link: https://lore.kernel.org/r/170319620635.2212653.5194389158785365150.stgit@djiang5-mobl3 Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl')
-rw-r--r--drivers/cxl/core/cdat.c98
-rw-r--r--drivers/cxl/cxl.h4
-rw-r--r--drivers/cxl/port.c2
3 files changed, 104 insertions, 0 deletions
diff --git a/drivers/cxl/core/cdat.c b/drivers/cxl/core/cdat.c
index 97d8ef8848c6..b3ab47d250e1 100644
--- a/drivers/cxl/core/cdat.c
+++ b/drivers/cxl/core/cdat.c
@@ -187,4 +187,102 @@ void cxl_endpoint_parse_cdat(struct cxl_port *port)
}
EXPORT_SYMBOL_NS_GPL(cxl_endpoint_parse_cdat, CXL);
+static int cdat_sslbis_handler(union acpi_subtable_headers *header, void *arg,
+ const unsigned long end)
+{
+ struct acpi_cdat_sslbis *sslbis;
+ int size = sizeof(header->cdat) + sizeof(*sslbis);
+ struct cxl_port *port = arg;
+ struct device *dev = &port->dev;
+ struct acpi_cdat_sslbe *entry;
+ int remain, entries, i;
+ u16 len;
+
+ len = le16_to_cpu((__force __le16)header->cdat.length);
+ remain = len - size;
+ if (!remain || remain % sizeof(*entry) ||
+ (unsigned long)header + len > end) {
+ dev_warn(dev, "Malformed SSLBIS table length: (%u)\n", len);
+ return -EINVAL;
+ }
+
+ /* Skip common header */
+ sslbis = (struct acpi_cdat_sslbis *)((unsigned long)header +
+ sizeof(header->cdat));
+
+ /* Unrecognized data type, we can skip */
+ if (sslbis->data_type > ACPI_HMAT_WRITE_BANDWIDTH)
+ return 0;
+
+ entries = remain / sizeof(*entry);
+ entry = (struct acpi_cdat_sslbe *)((unsigned long)header + sizeof(*sslbis));
+
+ for (i = 0; i < entries; i++) {
+ u16 x = le16_to_cpu((__force __le16)entry->portx_id);
+ u16 y = le16_to_cpu((__force __le16)entry->porty_id);
+ __le64 le_base;
+ __le16 le_val;
+ struct cxl_dport *dport;
+ unsigned long index;
+ u16 dsp_id;
+ u64 val;
+
+ switch (x) {
+ case ACPI_CDAT_SSLBIS_US_PORT:
+ dsp_id = y;
+ break;
+ case ACPI_CDAT_SSLBIS_ANY_PORT:
+ switch (y) {
+ case ACPI_CDAT_SSLBIS_US_PORT:
+ dsp_id = x;
+ break;
+ case ACPI_CDAT_SSLBIS_ANY_PORT:
+ dsp_id = ACPI_CDAT_SSLBIS_ANY_PORT;
+ break;
+ default:
+ dsp_id = y;
+ break;
+ }
+ break;
+ default:
+ dsp_id = x;
+ break;
+ }
+
+ le_base = (__force __le64)sslbis->entry_base_unit;
+ le_val = (__force __le16)entry->latency_or_bandwidth;
+
+ if (check_mul_overflow(le64_to_cpu(le_base),
+ le16_to_cpu(le_val), &val))
+ dev_warn(dev, "SSLBIS value overflowed!\n");
+
+ xa_for_each(&port->dports, index, dport) {
+ if (dsp_id == ACPI_CDAT_SSLBIS_ANY_PORT ||
+ dsp_id == dport->port_id)
+ cxl_access_coordinate_set(&dport->sw_coord,
+ sslbis->data_type,
+ val);
+ }
+
+ entry++;
+ }
+
+ return 0;
+}
+
+void cxl_switch_parse_cdat(struct cxl_port *port)
+{
+ int rc;
+
+ if (!port->cdat.table)
+ return;
+
+ rc = cdat_table_parse(ACPI_CDAT_TYPE_SSLBIS, cdat_sslbis_handler,
+ port, port->cdat.table);
+ rc = cdat_table_parse_output(rc);
+ if (rc)
+ dev_dbg(&port->dev, "Failed to parse SSLBIS: %d\n", rc);
+}
+EXPORT_SYMBOL_NS_GPL(cxl_switch_parse_cdat, CXL);
+
MODULE_IMPORT_NS(CXL);
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index be3b5eda875c..22f664b9f4c6 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -8,6 +8,7 @@
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/log2.h>
+#include <linux/node.h>
#include <linux/io.h>
/**
@@ -634,6 +635,7 @@ struct cxl_rcrb_info {
* @rch: Indicate whether this dport was enumerated in RCH or VH mode
* @port: reference to cxl_port that contains this downstream port
* @regs: Dport parsed register blocks
+ * @sw_coord: access coordinates (performance) for switch from CDAT
*/
struct cxl_dport {
struct device *dport_dev;
@@ -643,6 +645,7 @@ struct cxl_dport {
bool rch;
struct cxl_port *port;
struct cxl_regs regs;
+ struct access_coordinate sw_coord;
};
/**
@@ -840,6 +843,7 @@ static inline struct cxl_dax_region *to_cxl_dax_region(struct device *dev)
#endif
void cxl_endpoint_parse_cdat(struct cxl_port *port);
+void cxl_switch_parse_cdat(struct cxl_port *port);
/*
* Unit test builds overrides this to __weak, find the 'strong' version
diff --git a/drivers/cxl/port.c b/drivers/cxl/port.c
index a889c4e6cb27..da3c3a08bd62 100644
--- a/drivers/cxl/port.c
+++ b/drivers/cxl/port.c
@@ -69,6 +69,8 @@ static int cxl_switch_port_probe(struct cxl_port *port)
if (rc < 0)
return rc;
+ cxl_switch_parse_cdat(port);
+
cxlhdm = devm_cxl_setup_hdm(port, NULL);
if (!IS_ERR(cxlhdm))
return devm_cxl_enumerate_decoders(cxlhdm, NULL);