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cxl: Introduce cxl_to_{ways,granularity} 

Interleave granularity and ways have CXL specification defined encodings.
Promote the conversion helpers to a common header, and use them to
replace other open-coded instances.

Force caller to consider the error case of the conversion similarly to
other conversion helpers like kstrto*().

Co-developed-by: Ben Widawsky <bwidawsk@kernel.org>
Signed-off-by: Ben Widawsky <bwidawsk@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/165603875016.551046.17236943065932132355.stgit@dwillia2-xfh
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2022-05-22 17:04:27 -07:00
parent 885d3bed6d
commit 419af595b1
3 changed files with 54 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/cxl/acpi.c
View File

@ -9,10 +9,6 @@
#include "cxlpci.h"
#include "cxl.h"
/* Encode defined in CXL 2.0 8.2.5.12.7 HDM Decoder Control Register */
#define CFMWS_INTERLEAVE_WAYS(x) (1 << (x)->interleave_ways)
#define CFMWS_INTERLEAVE_GRANULARITY(x) ((x)->granularity + 8)
static unsigned long cfmws_to_decoder_flags(int restrictions)
{
unsigned long flags = CXL_DECODER_F_ENABLE;
@ -34,7 +30,8 @@ static unsigned long cfmws_to_decoder_flags(int restrictions)
static int cxl_acpi_cfmws_verify(struct device *dev,
struct acpi_cedt_cfmws *cfmws)
{
int expected_len;
int rc, expected_len;
unsigned int ways;
if (cfmws->interleave_arithmetic != ACPI_CEDT_CFMWS_ARITHMETIC_MODULO) {
dev_err(dev, "CFMWS Unsupported Interleave Arithmetic\n");
@ -51,14 +48,14 @@ static int cxl_acpi_cfmws_verify(struct device *dev,
return -EINVAL;
}
if (CFMWS_INTERLEAVE_WAYS(cfmws) > CXL_DECODER_MAX_INTERLEAVE) {
dev_err(dev, "CFMWS Interleave Ways (%d) too large\n",
CFMWS_INTERLEAVE_WAYS(cfmws));
rc = cxl_to_ways(cfmws->interleave_ways, &ways);
if (rc) {
dev_err(dev, "CFMWS Interleave Ways (%d) invalid\n",
cfmws->interleave_ways);
return -EINVAL;
}
expected_len = struct_size((cfmws), interleave_targets,
CFMWS_INTERLEAVE_WAYS(cfmws));
expected_len = struct_size(cfmws, interleave_targets, ways);
if (cfmws->header.length < expected_len) {
dev_err(dev, "CFMWS length %d less than expected %d\n",
@ -87,7 +84,8 @@ static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg,
struct device *dev = ctx->dev;
struct acpi_cedt_cfmws *cfmws;
struct cxl_decoder *cxld;
int rc, i;
unsigned int ways, i, ig;
int rc;
cfmws = (struct acpi_cedt_cfmws *) header;
@ -99,10 +97,16 @@ static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg,
return 0;
}
for (i = 0; i < CFMWS_INTERLEAVE_WAYS(cfmws); i++)
rc = cxl_to_ways(cfmws->interleave_ways, &ways);
if (rc)
return rc;
rc = cxl_to_granularity(cfmws->granularity, &ig);
if (rc)
return rc;
for (i = 0; i < ways; i++)
target_map[i] = cfmws->interleave_targets[i];
cxld = cxl_root_decoder_alloc(root_port, CFMWS_INTERLEAVE_WAYS(cfmws));
cxld = cxl_root_decoder_alloc(root_port, ways);
if (IS_ERR(cxld))
return 0;
@ -112,8 +116,8 @@ static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg,
.start = cfmws->base_hpa,
.end = cfmws->base_hpa + cfmws->window_size - 1,
};
cxld->interleave_ways = CFMWS_INTERLEAVE_WAYS(cfmws);
cxld->interleave_granularity = CFMWS_INTERLEAVE_GRANULARITY(cfmws);
cxld->interleave_ways = ways;
cxld->interleave_granularity = ig;
rc = cxl_decoder_add(cxld, target_map);
if (rc)

35
drivers/cxl/core/hdm.c
View File

@ -128,33 +128,12 @@ struct cxl_hdm *devm_cxl_setup_hdm(struct cxl_port *port)
}
EXPORT_SYMBOL_NS_GPL(devm_cxl_setup_hdm, CXL);
static int to_interleave_granularity(u32 ctrl)
{
int val = FIELD_GET(CXL_HDM_DECODER0_CTRL_IG_MASK, ctrl);
return 256 << val;
}
static int to_interleave_ways(u32 ctrl)
{
int val = FIELD_GET(CXL_HDM_DECODER0_CTRL_IW_MASK, ctrl);
switch (val) {
case 0 ... 4:
return 1 << val;
case 8 ... 10:
return 3 << (val - 8);
default:
return 0;
}
}
static int init_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld,
int *target_map, void __iomem *hdm, int which)
{
u64 size, base;
int i, rc;
u32 ctrl;
int i;
union {
u64 value;
unsigned char target_id[8];
@ -183,14 +162,18 @@ static int init_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld,
if (ctrl & CXL_HDM_DECODER0_CTRL_LOCK)
cxld->flags |= CXL_DECODER_F_LOCK;
}
cxld->interleave_ways = to_interleave_ways(ctrl);
if (!cxld->interleave_ways) {
rc = cxl_to_ways(FIELD_GET(CXL_HDM_DECODER0_CTRL_IW_MASK, ctrl),
&cxld->interleave_ways);
if (rc) {
dev_warn(&port->dev,
"decoder%d.%d: Invalid interleave ways (ctrl: %#x)\n",
port->id, cxld->id, ctrl);
return -ENXIO;
return rc;
}
cxld->interleave_granularity = to_interleave_granularity(ctrl);
rc = cxl_to_granularity(FIELD_GET(CXL_HDM_DECODER0_CTRL_IG_MASK, ctrl),
&cxld->interleave_granularity);
if (rc)
return rc;
if (FIELD_GET(CXL_HDM_DECODER0_CTRL_TYPE, ctrl))
cxld->target_type = CXL_DECODER_EXPANDER;

26
drivers/cxl/cxl.h
View File

@ -64,6 +64,32 @@ static inline int cxl_hdm_decoder_count(u32 cap_hdr)
return val ? val * 2 : 1;
}
/* Encode defined in CXL 2.0 8.2.5.12.7 HDM Decoder Control Register */
static inline int cxl_to_granularity(u16 ig, unsigned int *val)
{
if (ig > 6)
return -EINVAL;
*val = 256 << ig;
return 0;
}
/* Encode defined in CXL ECN "3, 6, 12 and 16-way memory Interleaving" */
static inline int cxl_to_ways(u8 eniw, unsigned int *val)
{
switch (eniw) {
case 0 ... 4:
*val = 1 << eniw;
break;
case 8 ... 10:
*val = 3 << (eniw - 8);
break;
default:
return -EINVAL;
}
return 0;
}
/* CXL 2.0 8.2.8.1 Device Capabilities Array Register */
#define CXLDEV_CAP_ARRAY_OFFSET 0x0
#define CXLDEV_CAP_ARRAY_CAP_ID 0