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Commit 6b577c9d authored by Linda Knippers's avatar Linda Knippers Committed by Dan Williams
Browse files

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: default avatarJeff Moyer <(jmoyer@redhat.com>
Signed-off-by: default avatarLinda Knippers <linda.knippers@hpe.com>
Acked-by: default avatarVishal Verma <vishal.l.verma@intel.com>
[vishal: fix up unit test for new header assumptions]
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent ff5a55f8

drivers/acpi/nfit.c

+35 −12
Original line number Diff line number Diff line
@@ -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;
@@ -1814,13 +1830,20 @@ 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);

	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);



 out_unlock:

drivers/acpi/nfit.h

+2 −1
Original line number Diff line number Diff line
@@ -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;

tools/testing/nvdimm/test/nfit.c

+15 −34
Original line number Diff line number Diff line
@@ -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;