diff --git a/drivers/cxl/Kconfig b/drivers/cxl/Kconfig index e6de221cc568..67c91378f2dd 100644 --- a/drivers/cxl/Kconfig +++ b/drivers/cxl/Kconfig @@ -51,6 +51,7 @@ config CXL_ACPI tristate "CXL ACPI: Platform Support" depends on ACPI default CXL_BUS + select ACPI_TABLE_LIB help Enable support for host managed device memory (HDM) resources published by a platform's ACPI CXL memory layout description. See diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index dadc7f64b9ff..7820082a2746 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -8,8 +8,6 @@ #include #include "cxl.h" -static struct acpi_table_header *acpi_cedt; - /* 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) @@ -74,134 +72,63 @@ static int cxl_acpi_cfmws_verify(struct device *dev, return 0; } -static void cxl_add_cfmws_decoders(struct device *dev, - struct cxl_port *root_port) +struct cxl_cfmws_context { + struct device *dev; + struct cxl_port *root_port; +}; + +static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg, + const unsigned long end) { int target_map[CXL_DECODER_MAX_INTERLEAVE]; + struct cxl_cfmws_context *ctx = arg; + struct cxl_port *root_port = ctx->root_port; + struct device *dev = ctx->dev; struct acpi_cedt_cfmws *cfmws; struct cxl_decoder *cxld; - acpi_size len, cur = 0; - void *cedt_subtable; - int rc; + int rc, i; - len = acpi_cedt->length - sizeof(*acpi_cedt); - cedt_subtable = acpi_cedt + 1; + cfmws = (struct acpi_cedt_cfmws *) header; - while (cur < len) { - struct acpi_cedt_header *c = cedt_subtable + cur; - int i; - - if (c->type != ACPI_CEDT_TYPE_CFMWS) { - cur += c->length; - continue; - } - - cfmws = cedt_subtable + cur; - - if (cfmws->header.length < sizeof(*cfmws)) { - dev_warn_once(dev, - "CFMWS entry skipped:invalid length:%u\n", - cfmws->header.length); - cur += c->length; - continue; - } - - rc = cxl_acpi_cfmws_verify(dev, cfmws); - if (rc) { - dev_err(dev, "CFMWS range %#llx-%#llx not registered\n", - cfmws->base_hpa, cfmws->base_hpa + - cfmws->window_size - 1); - cur += c->length; - continue; - } - - for (i = 0; i < CFMWS_INTERLEAVE_WAYS(cfmws); i++) - target_map[i] = cfmws->interleave_targets[i]; - - cxld = cxl_decoder_alloc(root_port, - CFMWS_INTERLEAVE_WAYS(cfmws)); - if (IS_ERR(cxld)) - goto next; - - cxld->flags = cfmws_to_decoder_flags(cfmws->restrictions); - cxld->target_type = CXL_DECODER_EXPANDER; - cxld->range = (struct range) { - .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); - - rc = cxl_decoder_add(cxld, target_map); - if (rc) - put_device(&cxld->dev); - else - rc = cxl_decoder_autoremove(dev, cxld); - if (rc) { - dev_err(dev, "Failed to add decoder for %#llx-%#llx\n", - cfmws->base_hpa, cfmws->base_hpa + - cfmws->window_size - 1); - goto next; - } - dev_dbg(dev, "add: %s range %#llx-%#llx\n", - dev_name(&cxld->dev), cfmws->base_hpa, + rc = cxl_acpi_cfmws_verify(dev, cfmws); + if (rc) { + dev_err(dev, "CFMWS range %#llx-%#llx not registered\n", + cfmws->base_hpa, cfmws->base_hpa + cfmws->window_size - 1); -next: - cur += c->length; - } -} - -static struct acpi_cedt_chbs *cxl_acpi_match_chbs(struct device *dev, u32 uid) -{ - struct acpi_cedt_chbs *chbs, *chbs_match = NULL; - acpi_size len, cur = 0; - void *cedt_subtable; - - len = acpi_cedt->length - sizeof(*acpi_cedt); - cedt_subtable = acpi_cedt + 1; - - while (cur < len) { - struct acpi_cedt_header *c = cedt_subtable + cur; - - if (c->type != ACPI_CEDT_TYPE_CHBS) { - cur += c->length; - continue; - } - - chbs = cedt_subtable + cur; - - if (chbs->header.length < sizeof(*chbs)) { - dev_warn_once(dev, - "CHBS entry skipped: invalid length:%u\n", - chbs->header.length); - cur += c->length; - continue; - } - - if (chbs->uid != uid) { - cur += c->length; - continue; - } - - if (chbs_match) { - dev_warn_once(dev, - "CHBS entry skipped: duplicate UID:%u\n", - uid); - cur += c->length; - continue; - } - - chbs_match = chbs; - cur += c->length; + return 0; } - return chbs_match ? chbs_match : ERR_PTR(-ENODEV); -} + for (i = 0; i < CFMWS_INTERLEAVE_WAYS(cfmws); i++) + target_map[i] = cfmws->interleave_targets[i]; -static resource_size_t get_chbcr(struct acpi_cedt_chbs *chbs) -{ - return IS_ERR(chbs) ? CXL_RESOURCE_NONE : chbs->base; + cxld = cxl_decoder_alloc(root_port, CFMWS_INTERLEAVE_WAYS(cfmws)); + if (IS_ERR(cxld)) + return 0; + + cxld->flags = cfmws_to_decoder_flags(cfmws->restrictions); + cxld->target_type = CXL_DECODER_EXPANDER; + cxld->range = (struct range){ + .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); + + rc = cxl_decoder_add(cxld, target_map); + if (rc) + put_device(&cxld->dev); + else + rc = cxl_decoder_autoremove(dev, cxld); + if (rc) { + dev_err(dev, "Failed to add decoder for %#llx-%#llx\n", + cfmws->base_hpa, + cfmws->base_hpa + cfmws->window_size - 1); + return 0; + } + dev_dbg(dev, "add: %s range %#llx-%#llx\n", dev_name(&cxld->dev), + cfmws->base_hpa, cfmws->base_hpa + cfmws->window_size - 1); + + return 0; } __mock int match_add_root_ports(struct pci_dev *pdev, void *data) @@ -355,12 +282,35 @@ static int add_host_bridge_uport(struct device *match, void *arg) return rc; } +struct cxl_chbs_context { + unsigned long long uid; + resource_size_t chbcr; +}; + +static int cxl_get_chbcr(union acpi_subtable_headers *header, void *arg, + const unsigned long end) +{ + struct cxl_chbs_context *ctx = arg; + struct acpi_cedt_chbs *chbs; + + if (ctx->chbcr) + return 0; + + chbs = (struct acpi_cedt_chbs *) header; + + if (ctx->uid != chbs->uid) + return 0; + ctx->chbcr = chbs->base; + + return 0; +} + static int add_host_bridge_dport(struct device *match, void *arg) { int rc; acpi_status status; unsigned long long uid; - struct acpi_cedt_chbs *chbs; + struct cxl_chbs_context ctx; struct cxl_port *root_port = arg; struct device *host = root_port->dev.parent; struct acpi_device *bridge = to_cxl_host_bridge(host, match); @@ -376,14 +326,18 @@ static int add_host_bridge_dport(struct device *match, void *arg) return -ENODEV; } - chbs = cxl_acpi_match_chbs(host, uid); - if (IS_ERR(chbs)) { + ctx = (struct cxl_chbs_context) { + .uid = uid, + }; + acpi_table_parse_cedt(ACPI_CEDT_TYPE_CHBS, cxl_get_chbcr, &ctx); + + if (ctx.chbcr == 0) { dev_warn(host, "No CHBS found for Host Bridge: %s\n", dev_name(match)); return 0; } - rc = cxl_add_dport(root_port, match, uid, get_chbcr(chbs)); + rc = cxl_add_dport(root_port, match, uid, ctx.chbcr); if (rc) { dev_err(host, "failed to add downstream port: %s\n", dev_name(match)); @@ -417,40 +371,29 @@ static int add_root_nvdimm_bridge(struct device *match, void *data) return 1; } -static u32 cedt_instance(struct platform_device *pdev) -{ - const bool *native_acpi0017 = acpi_device_get_match_data(&pdev->dev); - - if (native_acpi0017 && *native_acpi0017) - return 0; - - /* for cxl_test request a non-canonical instance */ - return U32_MAX; -} - static int cxl_acpi_probe(struct platform_device *pdev) { int rc; - acpi_status status; struct cxl_port *root_port; struct device *host = &pdev->dev; struct acpi_device *adev = ACPI_COMPANION(host); + struct cxl_cfmws_context ctx; root_port = devm_cxl_add_port(host, host, CXL_RESOURCE_NONE, NULL); if (IS_ERR(root_port)) return PTR_ERR(root_port); dev_dbg(host, "add: %s\n", dev_name(&root_port->dev)); - status = acpi_get_table(ACPI_SIG_CEDT, cedt_instance(pdev), &acpi_cedt); - if (ACPI_FAILURE(status)) - return -ENXIO; - rc = bus_for_each_dev(adev->dev.bus, NULL, root_port, add_host_bridge_dport); - if (rc) - goto out; + if (rc < 0) + return rc; - cxl_add_cfmws_decoders(host, root_port); + ctx = (struct cxl_cfmws_context) { + .dev = host, + .root_port = root_port, + }; + acpi_table_parse_cedt(ACPI_CEDT_TYPE_CFMWS, cxl_parse_cfmws, &ctx); /* * Root level scanned with host-bridge as dports, now scan host-bridges @@ -458,24 +401,20 @@ static int cxl_acpi_probe(struct platform_device *pdev) */ rc = bus_for_each_dev(adev->dev.bus, NULL, root_port, add_host_bridge_uport); - if (rc) - goto out; + if (rc < 0) + return rc; if (IS_ENABLED(CONFIG_CXL_PMEM)) rc = device_for_each_child(&root_port->dev, root_port, add_root_nvdimm_bridge); - -out: - acpi_put_table(acpi_cedt); if (rc < 0) return rc; + return 0; } -static bool native_acpi0017 = true; - static const struct acpi_device_id cxl_acpi_ids[] = { - { "ACPI0017", (unsigned long) &native_acpi0017 }, + { "ACPI0017" }, { }, }; MODULE_DEVICE_TABLE(acpi, cxl_acpi_ids); @@ -491,3 +430,4 @@ static struct platform_driver cxl_acpi_driver = { module_platform_driver(cxl_acpi_driver); MODULE_LICENSE("GPL v2"); MODULE_IMPORT_NS(CXL); +MODULE_IMPORT_NS(ACPI);