tools/testing/nvdimm: unit test for acpi_nfit_notify()

We have had a couple bugs in this implementation in the past and before
we add another ->notify() implementation for nvdimm devices, lets allow
this routine to be exercised via nfit_test.

Rewrite acpi_nfit_notify() in terms of a generic struct device and
acpi_handle parameter, and then implement a mock acpi_evaluate_object()
that returns a _FIT payload.

Cc: Vishal Verma <vishal.l.verma@intel.com>
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 4a363be..8120e82 100644 (file)
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -2670,11 +2670,10 @@ static int acpi_nfit_remove(struct acpi_device *adev)
        return 0;
 }
 
-static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
+void __acpi_nfit_notify(struct device *dev, acpi_handle handle, u32 event)
 {
-       struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev);
+       struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(dev);
        struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
-       struct device *dev = &adev->dev;
        union acpi_object *obj;
        acpi_status status;
        int ret;
@@ -2684,18 +2683,17 @@ static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
        if (event != NFIT_NOTIFY_UPDATE)
                return;
 
-       device_lock(dev);
        if (!dev->driver) {
                /* dev->driver may be null if we're being removed */
                dev_dbg(dev, "%s: no driver found for dev\n", __func__);
-               goto out_unlock;
+               return;
        }
 
        if (!acpi_desc) {
                acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
                if (!acpi_desc)
-                       goto out_unlock;
-               acpi_nfit_desc_init(acpi_desc, &adev->dev);
+                       return;
+               acpi_nfit_desc_init(acpi_desc, dev);
        } else {
                /*
                 * Finish previous registration before considering new
@@ -2705,10 +2703,10 @@ static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
        }
 
        /* Evaluate _FIT */
-       status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);
+       status = acpi_evaluate_object(handle, "_FIT", NULL, &buf);
        if (ACPI_FAILURE(status)) {
                dev_err(dev, "failed to evaluate _FIT\n");
-               goto out_unlock;
+               return;
        }
 
        obj = buf.pointer;
@@ -2720,9 +2718,14 @@ static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
        } else
                dev_err(dev, "Invalid _FIT\n");
        kfree(buf.pointer);
+}
+EXPORT_SYMBOL_GPL(__acpi_nfit_notify);
 
- out_unlock:
-       device_unlock(dev);
+static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
+{
+       device_lock(&adev->dev);
+       __acpi_nfit_notify(&adev->dev, adev->handle, event);
+       device_unlock(&adev->dev);
 }
 
 static const struct acpi_device_id acpi_nfit_ids[] = {

diff --git a/drivers/acpi/nfit/nfit.h b/drivers/acpi/nfit/nfit.h
index 51d23f1..5237034 100644 (file)
--- a/drivers/acpi/nfit/nfit.h
+++ b/drivers/acpi/nfit/nfit.h
@@ -227,5 +227,6 @@ static inline struct acpi_nfit_desc *to_acpi_desc(
 
 const u8 *to_nfit_uuid(enum nfit_uuids id);
 int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, void *nfit, acpi_size sz);
+void __acpi_nfit_notify(struct device *dev, acpi_handle handle, u32 event);
 void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev);
 #endif /* __NFIT_H__ */

diff --git a/tools/testing/nvdimm/Kbuild b/tools/testing/nvdimm/Kbuild
index ad6dd05..582db95 100644 (file)
--- a/tools/testing/nvdimm/Kbuild
+++ b/tools/testing/nvdimm/Kbuild
@@ -13,6 +13,7 @@ ldflags-y += --wrap=__release_region
 ldflags-y += --wrap=devm_memremap_pages
 ldflags-y += --wrap=insert_resource
 ldflags-y += --wrap=remove_resource
+ldflags-y += --wrap=acpi_evaluate_object
 
 DRIVERS := ../../../drivers
 NVDIMM_SRC := $(DRIVERS)/nvdimm

diff --git a/tools/testing/nvdimm/test/iomap.c b/tools/testing/nvdimm/test/iomap.c
index c29f8dc..dae5b9b 100644 (file)
--- a/tools/testing/nvdimm/test/iomap.c
+++ b/tools/testing/nvdimm/test/iomap.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/pfn_t.h>
+#include <linux/acpi.h>
 #include <linux/io.h>
 #include <linux/mm.h>
 #include "nfit_test.h"
@@ -276,4 +277,20 @@ void __wrap___devm_release_region(struct device *dev, struct resource *parent,
 }
 EXPORT_SYMBOL(__wrap___devm_release_region);
 
+acpi_status __wrap_acpi_evaluate_object(acpi_handle handle, acpi_string path,
+               struct acpi_object_list *p, struct acpi_buffer *buf)
+{
+       struct nfit_test_resource *nfit_res = get_nfit_res((long) handle);
+       union acpi_object **obj;
+
+       if (!nfit_res || strcmp(path, "_FIT") || !buf)
+               return acpi_evaluate_object(handle, path, p, buf);
+
+       obj = nfit_res->buf;
+       buf->length = sizeof(union acpi_object);
+       buf->pointer = *obj;
+       return AE_OK;
+}
+EXPORT_SYMBOL(__wrap_acpi_evaluate_object);
+
 MODULE_LICENSE("GPL v2");

diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c
index dd48f42..8d79c75 100644 (file)
--- a/tools/testing/nvdimm/test/nfit.c
+++ b/tools/testing/nvdimm/test/nfit.c
@@ -154,6 +154,8 @@ struct nfit_test {
        int (*alloc)(struct nfit_test *t);
        void (*setup)(struct nfit_test *t);
        int setup_hotplug;
+       union acpi_object **_fit;
+       dma_addr_t _fit_dma;
        struct ars_state {
                struct nd_cmd_ars_status *ars_status;
                unsigned long deadline;
@@ -615,6 +617,10 @@ static int nfit_test0_alloc(struct nfit_test *t)
                        return -ENOMEM;
        }
 
+       t->_fit = test_alloc(t, sizeof(union acpi_object **), &t->_fit_dma);
+       if (!t->_fit)
+               return -ENOMEM;
+
        return ars_state_init(&t->pdev.dev, &t->ars_state);
 }
 
@@ -1408,6 +1414,7 @@ static int nfit_test_probe(struct platform_device *pdev)
        struct acpi_nfit_desc *acpi_desc;
        struct device *dev = &pdev->dev;
        struct nfit_test *nfit_test;
+       union acpi_object *obj;
        int rc;
 
        nfit_test = to_nfit_test(&pdev->dev);
@@ -1475,15 +1482,17 @@ static int nfit_test_probe(struct platform_device *pdev)
        if (nfit_test->setup != nfit_test0_setup)
                return 0;
 
-       flush_work(&acpi_desc->work);
        nfit_test->setup_hotplug = 1;
        nfit_test->setup(nfit_test);
 
-       rc = acpi_nfit_init(acpi_desc, nfit_test->nfit_buf,
-                       nfit_test->nfit_size);
-       if (rc)
-               return rc;
-
+       obj = kzalloc(sizeof(*obj), GFP_KERNEL);
+       if (!obj)
+               return -ENOMEM;
+       obj->type = ACPI_TYPE_BUFFER;
+       obj->buffer.length = nfit_test->nfit_size;
+       obj->buffer.pointer = nfit_test->nfit_buf;
+       *(nfit_test->_fit) = obj;
+       __acpi_nfit_notify(&pdev->dev, nfit_test, 0x80);
        return 0;
 }