From bc0d0d093b379b0b379c429e3348498287c8a9ca Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Mon, 30 Nov 2015 09:10:33 -0800 Subject: libnvdimm, e820: skip module loading when no type-12 If there are no persistent memory ranges present then don't bother creating the platform device. Otherwise, it loads the full libnvdimm sub-system only to discover no resources present. Reported-by: Andy Lutomirski Acked-by: Andy Lutomirski Signed-off-by: Dan Williams --- arch/x86/kernel/pmem.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/x86/kernel/pmem.c b/arch/x86/kernel/pmem.c index 4f00b63d7ff3..14415aff1813 100644 --- a/arch/x86/kernel/pmem.c +++ b/arch/x86/kernel/pmem.c @@ -4,10 +4,22 @@ */ #include #include +#include + +static int found(u64 start, u64 end, void *data) +{ + return 1; +} static __init int register_e820_pmem(void) { + char *pmem = "Persistent Memory (legacy)"; struct platform_device *pdev; + int rc; + + rc = walk_iomem_res(pmem, IORESOURCE_MEM, 0, -1, NULL, found); + if (rc <= 0) + return 0; /* * See drivers/nvdimm/e820.c for the implementation, this is -- cgit v1.2.3 From 826c416f3c9493b69630a811832cfb7c9007f840 Mon Sep 17 00:00:00 2001 From: Linda Knippers Date: Fri, 20 Nov 2015 19:05:47 -0500 Subject: nfit: Account for table size length variation The size of NFIT tables don't necessarily match the size of the data structures that we use for them. For example, the NVDIMM Control Region Structure table is shorter for a device with no block control windows than for a device with block control windows. Other tables, such as Flush Hint Address Structure and the Interleave Structure are variable length by definition. Account for the size difference when comparing table entries by using the actual table size from the table header if it's less than the structure size. Signed-off-by: Linda Knippers Acked-by: Vishal Verma Signed-off-by: Dan Williams --- drivers/acpi/nfit.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c index f7dab53b352a..4d5ab285de94 100644 --- a/drivers/acpi/nfit.c +++ b/drivers/acpi/nfit.c @@ -233,11 +233,12 @@ static bool add_spa(struct acpi_nfit_desc *acpi_desc, struct nfit_table_prev *prev, struct acpi_nfit_system_address *spa) { + size_t length = min_t(size_t, sizeof(*spa), spa->header.length); struct device *dev = acpi_desc->dev; struct nfit_spa *nfit_spa; list_for_each_entry(nfit_spa, &prev->spas, list) { - if (memcmp(nfit_spa->spa, spa, sizeof(*spa)) == 0) { + if (memcmp(nfit_spa->spa, spa, length) == 0) { list_move_tail(&nfit_spa->list, &acpi_desc->spas); return true; } @@ -259,11 +260,12 @@ static bool add_memdev(struct acpi_nfit_desc *acpi_desc, struct nfit_table_prev *prev, struct acpi_nfit_memory_map *memdev) { + size_t length = min_t(size_t, sizeof(*memdev), memdev->header.length); struct device *dev = acpi_desc->dev; struct nfit_memdev *nfit_memdev; list_for_each_entry(nfit_memdev, &prev->memdevs, list) - if (memcmp(nfit_memdev->memdev, memdev, sizeof(*memdev)) == 0) { + if (memcmp(nfit_memdev->memdev, memdev, length) == 0) { list_move_tail(&nfit_memdev->list, &acpi_desc->memdevs); return true; } @@ -284,11 +286,12 @@ static bool add_dcr(struct acpi_nfit_desc *acpi_desc, struct nfit_table_prev *prev, struct acpi_nfit_control_region *dcr) { + size_t length = min_t(size_t, sizeof(*dcr), dcr->header.length); struct device *dev = acpi_desc->dev; struct nfit_dcr *nfit_dcr; list_for_each_entry(nfit_dcr, &prev->dcrs, list) - if (memcmp(nfit_dcr->dcr, dcr, sizeof(*dcr)) == 0) { + if (memcmp(nfit_dcr->dcr, dcr, length) == 0) { list_move_tail(&nfit_dcr->list, &acpi_desc->dcrs); return true; } @@ -308,11 +311,12 @@ static bool add_bdw(struct acpi_nfit_desc *acpi_desc, struct nfit_table_prev *prev, struct acpi_nfit_data_region *bdw) { + size_t length = min_t(size_t, sizeof(*bdw), bdw->header.length); struct device *dev = acpi_desc->dev; struct nfit_bdw *nfit_bdw; list_for_each_entry(nfit_bdw, &prev->bdws, list) - if (memcmp(nfit_bdw->bdw, bdw, sizeof(*bdw)) == 0) { + if (memcmp(nfit_bdw->bdw, bdw, length) == 0) { list_move_tail(&nfit_bdw->list, &acpi_desc->bdws); return true; } @@ -332,11 +336,12 @@ static bool add_idt(struct acpi_nfit_desc *acpi_desc, struct nfit_table_prev *prev, struct acpi_nfit_interleave *idt) { + size_t length = min_t(size_t, sizeof(*idt), idt->header.length); struct device *dev = acpi_desc->dev; struct nfit_idt *nfit_idt; list_for_each_entry(nfit_idt, &prev->idts, list) - if (memcmp(nfit_idt->idt, idt, sizeof(*idt)) == 0) { + if (memcmp(nfit_idt->idt, idt, length) == 0) { list_move_tail(&nfit_idt->list, &acpi_desc->idts); return true; } @@ -356,11 +361,12 @@ static bool add_flush(struct acpi_nfit_desc *acpi_desc, struct nfit_table_prev *prev, struct acpi_nfit_flush_address *flush) { + size_t length = min_t(size_t, sizeof(*flush), flush->header.length); struct device *dev = acpi_desc->dev; struct nfit_flush *nfit_flush; list_for_each_entry(nfit_flush, &prev->flushes, list) - if (memcmp(nfit_flush->flush, flush, sizeof(*flush)) == 0) { + if (memcmp(nfit_flush->flush, flush, length) == 0) { list_move_tail(&nfit_flush->list, &acpi_desc->flushes); return true; } -- cgit v1.2.3 From ff5a55f89c6690a0b292f1a7e0cd4532961588d5 Mon Sep 17 00:00:00 2001 From: Linda Knippers Date: Fri, 20 Nov 2015 19:05:48 -0500 Subject: nfit: Fix the check for a successful NFIT merge Missed previously due to a lack of test coverage on a platform that provided an valid response to _FIT. Signed-off-by: Linda Knippers Acked-by: Vishal Verma Signed-off-by: Dan Williams --- drivers/acpi/nfit.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c index 4d5ab285de94..f92adb5b0fef 100644 --- a/drivers/acpi/nfit.c +++ b/drivers/acpi/nfit.c @@ -1816,7 +1816,7 @@ static void acpi_nfit_notify(struct acpi_device *adev, u32 event) nfit_saved = acpi_desc->nfit; acpi_desc->nfit = (struct acpi_table_nfit *)buf.pointer; ret = acpi_nfit_init(acpi_desc, buf.length); - if (!ret) { + if (ret) { /* Merge failed, restore old nfit, and exit */ acpi_desc->nfit = nfit_saved; dev_err(dev, "failed to merge updated NFIT\n"); -- cgit v1.2.3 From 6b577c9d772c45448aec784ec235cea228b4d3ad Mon Sep 17 00:00:00 2001 From: Linda Knippers Date: Fri, 20 Nov 2015 19:05:49 -0500 Subject: nfit: Adjust for different _FIT and NFIT headers When support for _FIT was added, the code presumed that the data returned by the _FIT method is identical to the NFIT table, which starts with an acpi_table_header. However, the _FIT is defined to return a data in the format of a series of NFIT type structure entries and as a method, has an acpi_object header rather tahn an acpi_table_header. To address the differences, explicitly save the acpi_table_header from the NFIT, since it is accessible through /sys, and change the nfit pointer in the acpi_desc structure to point to the table entries rather than the headers. Reported-by: Jeff Moyer (jmoyer@redhat.com> Signed-off-by: Linda Knippers Acked-by: Vishal Verma [vishal: fix up unit test for new header assumptions] Signed-off-by: Dan Williams --- drivers/acpi/nfit.c | 47 ++++++++++++++++++++++++++++---------- drivers/acpi/nfit.h | 3 ++- tools/testing/nvdimm/test/nfit.c | 49 ++++++++++++---------------------------- 3 files changed, 52 insertions(+), 47 deletions(-) diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c index f92adb5b0fef..e7ed39bab97d 100644 --- a/drivers/acpi/nfit.c +++ b/drivers/acpi/nfit.c @@ -661,7 +661,7 @@ static ssize_t revision_show(struct device *dev, struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus); struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc); - return sprintf(buf, "%d\n", acpi_desc->nfit->header.revision); + return sprintf(buf, "%d\n", acpi_desc->acpi_header.revision); } static DEVICE_ATTR_RO(revision); @@ -1658,7 +1658,6 @@ int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz) data = (u8 *) acpi_desc->nfit; end = data + sz; - data += sizeof(struct acpi_table_nfit); while (!IS_ERR_OR_NULL(data)) data = add_table(acpi_desc, &prev, data, end); @@ -1754,13 +1753,29 @@ static int acpi_nfit_add(struct acpi_device *adev) return PTR_ERR(acpi_desc); } - acpi_desc->nfit = (struct acpi_table_nfit *) tbl; + /* + * Save the acpi header for later and then skip it, + * making nfit point to the first nfit table header. + */ + acpi_desc->acpi_header = *tbl; + acpi_desc->nfit = (void *) tbl + sizeof(struct acpi_table_nfit); + sz -= sizeof(struct acpi_table_nfit); /* Evaluate _FIT and override with that if present */ status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf); if (ACPI_SUCCESS(status) && buf.length > 0) { - acpi_desc->nfit = (struct acpi_table_nfit *)buf.pointer; - sz = buf.length; + union acpi_object *obj; + /* + * Adjust for the acpi_object header of the _FIT + */ + obj = buf.pointer; + if (obj->type == ACPI_TYPE_BUFFER) { + acpi_desc->nfit = + (struct acpi_nfit_header *)obj->buffer.pointer; + sz = obj->buffer.length; + } else + dev_dbg(dev, "%s invalid type %d, ignoring _FIT\n", + __func__, (int) obj->type); } rc = acpi_nfit_init(acpi_desc, sz); @@ -1783,7 +1798,8 @@ static void acpi_nfit_notify(struct acpi_device *adev, u32 event) { struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev); struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL }; - struct acpi_table_nfit *nfit_saved; + struct acpi_nfit_header *nfit_saved; + union acpi_object *obj; struct device *dev = &adev->dev; acpi_status status; int ret; @@ -1814,12 +1830,19 @@ static void acpi_nfit_notify(struct acpi_device *adev, u32 event) } nfit_saved = acpi_desc->nfit; - acpi_desc->nfit = (struct acpi_table_nfit *)buf.pointer; - ret = acpi_nfit_init(acpi_desc, buf.length); - if (ret) { - /* Merge failed, restore old nfit, and exit */ - acpi_desc->nfit = nfit_saved; - dev_err(dev, "failed to merge updated NFIT\n"); + obj = buf.pointer; + if (obj->type == ACPI_TYPE_BUFFER) { + acpi_desc->nfit = + (struct acpi_nfit_header *)obj->buffer.pointer; + ret = acpi_nfit_init(acpi_desc, obj->buffer.length); + if (ret) { + /* Merge failed, restore old nfit, and exit */ + acpi_desc->nfit = nfit_saved; + dev_err(dev, "failed to merge updated NFIT\n"); + } + } else { + /* Bad _FIT, restore old nfit */ + dev_err(dev, "Invalid _FIT\n"); } kfree(buf.pointer); diff --git a/drivers/acpi/nfit.h b/drivers/acpi/nfit.h index 2ea5c0797c8f..3d549a383659 100644 --- a/drivers/acpi/nfit.h +++ b/drivers/acpi/nfit.h @@ -96,7 +96,8 @@ struct nfit_mem { struct acpi_nfit_desc { struct nvdimm_bus_descriptor nd_desc; - struct acpi_table_nfit *nfit; + struct acpi_table_header acpi_header; + struct acpi_nfit_header *nfit; struct mutex spa_map_mutex; struct mutex init_mutex; struct list_head spa_maps; diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c index 40ab4476c80a..51cf8256c6cd 100644 --- a/tools/testing/nvdimm/test/nfit.c +++ b/tools/testing/nvdimm/test/nfit.c @@ -420,8 +420,7 @@ static struct nfit_test_resource *nfit_test_lookup(resource_size_t addr) static int nfit_test0_alloc(struct nfit_test *t) { - size_t nfit_size = sizeof(struct acpi_table_nfit) - + sizeof(struct acpi_nfit_system_address) * NUM_SPA + size_t nfit_size = sizeof(struct acpi_nfit_system_address) * NUM_SPA + sizeof(struct acpi_nfit_memory_map) * NUM_MEM + sizeof(struct acpi_nfit_control_region) * NUM_DCR + sizeof(struct acpi_nfit_data_region) * NUM_BDW @@ -471,8 +470,7 @@ static int nfit_test0_alloc(struct nfit_test *t) static int nfit_test1_alloc(struct nfit_test *t) { - size_t nfit_size = sizeof(struct acpi_table_nfit) - + sizeof(struct acpi_nfit_system_address) + size_t nfit_size = sizeof(struct acpi_nfit_system_address) + sizeof(struct acpi_nfit_memory_map) + sizeof(struct acpi_nfit_control_region); @@ -488,39 +486,24 @@ static int nfit_test1_alloc(struct nfit_test *t) return 0; } -static void nfit_test_init_header(struct acpi_table_nfit *nfit, size_t size) -{ - memcpy(nfit->header.signature, ACPI_SIG_NFIT, 4); - nfit->header.length = size; - nfit->header.revision = 1; - memcpy(nfit->header.oem_id, "LIBND", 6); - memcpy(nfit->header.oem_table_id, "TEST", 5); - nfit->header.oem_revision = 1; - memcpy(nfit->header.asl_compiler_id, "TST", 4); - nfit->header.asl_compiler_revision = 1; -} - static void nfit_test0_setup(struct nfit_test *t) { struct nvdimm_bus_descriptor *nd_desc; struct acpi_nfit_desc *acpi_desc; struct acpi_nfit_memory_map *memdev; void *nfit_buf = t->nfit_buf; - size_t size = t->nfit_size; struct acpi_nfit_system_address *spa; struct acpi_nfit_control_region *dcr; struct acpi_nfit_data_region *bdw; struct acpi_nfit_flush_address *flush; unsigned int offset; - nfit_test_init_header(nfit_buf, size); - /* * spa0 (interleave first half of dimm0 and dimm1, note storage * does not actually alias the related block-data-window * regions) */ - spa = nfit_buf + sizeof(struct acpi_table_nfit); + spa = nfit_buf; spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS; spa->header.length = sizeof(*spa); memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_PM), 16); @@ -533,7 +516,7 @@ static void nfit_test0_setup(struct nfit_test *t) * does not actually alias the related block-data-window * regions) */ - spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa); + spa = nfit_buf + sizeof(*spa); spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS; spa->header.length = sizeof(*spa); memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_PM), 16); @@ -542,7 +525,7 @@ static void nfit_test0_setup(struct nfit_test *t) spa->length = SPA1_SIZE; /* spa2 (dcr0) dimm0 */ - spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 2; + spa = nfit_buf + sizeof(*spa) * 2; spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS; spa->header.length = sizeof(*spa); memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_DCR), 16); @@ -551,7 +534,7 @@ static void nfit_test0_setup(struct nfit_test *t) spa->length = DCR_SIZE; /* spa3 (dcr1) dimm1 */ - spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 3; + spa = nfit_buf + sizeof(*spa) * 3; spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS; spa->header.length = sizeof(*spa); memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_DCR), 16); @@ -560,7 +543,7 @@ static void nfit_test0_setup(struct nfit_test *t) spa->length = DCR_SIZE; /* spa4 (dcr2) dimm2 */ - spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 4; + spa = nfit_buf + sizeof(*spa) * 4; spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS; spa->header.length = sizeof(*spa); memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_DCR), 16); @@ -569,7 +552,7 @@ static void nfit_test0_setup(struct nfit_test *t) spa->length = DCR_SIZE; /* spa5 (dcr3) dimm3 */ - spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 5; + spa = nfit_buf + sizeof(*spa) * 5; spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS; spa->header.length = sizeof(*spa); memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_DCR), 16); @@ -578,7 +561,7 @@ static void nfit_test0_setup(struct nfit_test *t) spa->length = DCR_SIZE; /* spa6 (bdw for dcr0) dimm0 */ - spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 6; + spa = nfit_buf + sizeof(*spa) * 6; spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS; spa->header.length = sizeof(*spa); memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_BDW), 16); @@ -587,7 +570,7 @@ static void nfit_test0_setup(struct nfit_test *t) spa->length = DIMM_SIZE; /* spa7 (bdw for dcr1) dimm1 */ - spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 7; + spa = nfit_buf + sizeof(*spa) * 7; spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS; spa->header.length = sizeof(*spa); memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_BDW), 16); @@ -596,7 +579,7 @@ static void nfit_test0_setup(struct nfit_test *t) spa->length = DIMM_SIZE; /* spa8 (bdw for dcr2) dimm2 */ - spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 8; + spa = nfit_buf + sizeof(*spa) * 8; spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS; spa->header.length = sizeof(*spa); memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_BDW), 16); @@ -605,7 +588,7 @@ static void nfit_test0_setup(struct nfit_test *t) spa->length = DIMM_SIZE; /* spa9 (bdw for dcr3) dimm3 */ - spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 9; + spa = nfit_buf + sizeof(*spa) * 9; spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS; spa->header.length = sizeof(*spa); memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_BDW), 16); @@ -613,7 +596,7 @@ static void nfit_test0_setup(struct nfit_test *t) spa->address = t->dimm_dma[3]; spa->length = DIMM_SIZE; - offset = sizeof(struct acpi_table_nfit) + sizeof(*spa) * 10; + offset = sizeof(*spa) * 10; /* mem-region0 (spa0, dimm0) */ memdev = nfit_buf + offset; memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP; @@ -1100,15 +1083,13 @@ static void nfit_test0_setup(struct nfit_test *t) static void nfit_test1_setup(struct nfit_test *t) { - size_t size = t->nfit_size, offset; + size_t offset; void *nfit_buf = t->nfit_buf; struct acpi_nfit_memory_map *memdev; struct acpi_nfit_control_region *dcr; struct acpi_nfit_system_address *spa; - nfit_test_init_header(nfit_buf, size); - - offset = sizeof(struct acpi_table_nfit); + offset = 0; /* spa0 (flat range with no bdw aliasing) */ spa = nfit_buf + offset; spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS; -- cgit v1.2.3