93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright(c) 2023 Intel Corporation. All rights reserved. */
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#include <linux/acpi.h>
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#include <linux/xarray.h>
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#include <linux/fw_table.h>
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#include "cxlpci.h"
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#include "cxl.h"
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struct dsmas_entry {
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struct range dpa_range;
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u8 handle;
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};
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static int cdat_dsmas_handler(union acpi_subtable_headers *header, void *arg,
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const unsigned long end)
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{
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struct acpi_cdat_header *hdr = &header->cdat;
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struct acpi_cdat_dsmas *dsmas;
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int size = sizeof(*hdr) + sizeof(*dsmas);
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struct xarray *dsmas_xa = arg;
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struct dsmas_entry *dent;
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u16 len;
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int rc;
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len = le16_to_cpu((__force __le16)hdr->length);
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if (len != size || (unsigned long)hdr + len > end) {
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pr_warn("Malformed DSMAS table length: (%u:%u)\n", size, len);
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return -EINVAL;
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}
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/* Skip common header */
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dsmas = (struct acpi_cdat_dsmas *)(hdr + 1);
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dent = kzalloc(sizeof(*dent), GFP_KERNEL);
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if (!dent)
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return -ENOMEM;
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dent->handle = dsmas->dsmad_handle;
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dent->dpa_range.start = le64_to_cpu((__force __le64)dsmas->dpa_base_address);
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dent->dpa_range.end = le64_to_cpu((__force __le64)dsmas->dpa_base_address) +
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le64_to_cpu((__force __le64)dsmas->dpa_length) - 1;
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rc = xa_insert(dsmas_xa, dent->handle, dent, GFP_KERNEL);
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if (rc) {
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kfree(dent);
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return rc;
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}
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return 0;
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}
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static int cxl_cdat_endpoint_process(struct cxl_port *port,
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struct xarray *dsmas_xa)
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{
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return cdat_table_parse(ACPI_CDAT_TYPE_DSMAS, cdat_dsmas_handler,
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dsmas_xa, port->cdat.table);
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}
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static void discard_dsmas(struct xarray *xa)
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{
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unsigned long index;
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void *ent;
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xa_for_each(xa, index, ent) {
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xa_erase(xa, index);
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kfree(ent);
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}
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xa_destroy(xa);
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}
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DEFINE_FREE(dsmas, struct xarray *, if (_T) discard_dsmas(_T))
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void cxl_endpoint_parse_cdat(struct cxl_port *port)
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{
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struct xarray __dsmas_xa;
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struct xarray *dsmas_xa __free(dsmas) = &__dsmas_xa;
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int rc;
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xa_init(&__dsmas_xa);
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if (!port->cdat.table)
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return;
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rc = cxl_cdat_endpoint_process(port, dsmas_xa);
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if (rc < 0) {
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dev_dbg(&port->dev, "Failed to parse CDAT: %d\n", rc);
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return;
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}
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/* Performance data processing */
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}
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EXPORT_SYMBOL_NS_GPL(cxl_endpoint_parse_cdat, CXL);
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MODULE_IMPORT_NS(CXL);
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