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Subject[PATCH] nfit: Collect shutdown status for NVDIMM_FAMILY_HYPERV
Date

See http://www.uefi.org/RFIC_LIST ("Virtual NVDIMM 0x1901"):
"Get Unsafe Shutdown Count (Function Index 2)".

Let's expose the info to the userspace (e.g. ntctl) via sysfs.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
---
drivers/acpi/nfit/core.c | 51 ++++++++++++++++++++++++++++++++++++++
drivers/acpi/nfit/hyperv.h | 26 +++++++++++++++++++
2 files changed, 77 insertions(+)
create mode 100644 drivers/acpi/nfit/hyperv.h

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index d5a164b6833a..d504da34ce34 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -25,6 +25,7 @@
#include <asm/cacheflush.h>
#include <acpi/nfit.h>
#include "intel.h"
+#include "hyperv.h"
#include "nfit.h"

/*
@@ -1802,6 +1803,54 @@ __weak void nfit_intel_shutdown_status(struct nfit_mem *nfit_mem)
}
}

+__weak void nfit_hyperv_shutdown_status(struct nfit_mem *nfit_mem)
+{
+ struct device *dev = &nfit_mem->adev->dev;
+ struct nd_hyperv_shutdown_status status;
+ union acpi_object in_buf = {
+ .buffer.type = ACPI_TYPE_BUFFER,
+ .buffer.length = 0,
+ };
+ union acpi_object in_obj = {
+ .package.type = ACPI_TYPE_PACKAGE,
+ .package.count = 1,
+ .package.elements = &in_buf,
+ };
+ const u8 func = ND_HYPERV_GET_UNSAFE_SHUTDOWN_COUNT;
+ const guid_t *guid = to_nfit_uuid(nfit_mem->family);
+ u8 revid = nfit_dsm_revid(nfit_mem->family, func);
+ struct acpi_device *adev = nfit_mem->adev;
+ acpi_handle handle = adev->handle;
+ union acpi_object *out_obj;
+
+ if ((nfit_mem->dsm_mask & BIT(func)) == 0)
+ return;
+
+ out_obj = acpi_evaluate_dsm(handle, guid, revid, func, &in_obj);
+ if (!out_obj || out_obj->type != ACPI_TYPE_BUFFER
+ || out_obj->buffer.length < sizeof(status)) {
+ dev_dbg(dev->parent,
+ "%s: failed to get Unsafe Shutdown Count\n",
+ dev_name(dev));
+ ACPI_FREE(out_obj);
+ return;
+ }
+
+ memcpy(&status, out_obj->buffer.pointer, sizeof(status));
+ ACPI_FREE(out_obj);
+
+ if (status.general_err != 0) {
+ dev_dbg(dev->parent,
+ "%s: failed to get Unsafe Shutdown Count: err=0x%x\n",
+ dev_name(dev), status.status);
+ return;
+ }
+
+ set_bit(NFIT_MEM_DIRTY_COUNT, &nfit_mem->flags);
+ nfit_mem->dirty_shutdown = status.shutdown_count;
+}
+
+
static void populate_shutdown_status(struct nfit_mem *nfit_mem)
{
/*
@@ -1811,6 +1860,8 @@ static void populate_shutdown_status(struct nfit_mem *nfit_mem)
*/
if (nfit_mem->family == NVDIMM_FAMILY_INTEL)
nfit_intel_shutdown_status(nfit_mem);
+ else if (nfit_mem->family == NVDIMM_FAMILY_HYPERV)
+ nfit_hyperv_shutdown_status(nfit_mem);
}

static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
diff --git a/drivers/acpi/nfit/hyperv.h b/drivers/acpi/nfit/hyperv.h
new file mode 100644
index 000000000000..c4a25b8624cc
--- /dev/null
+++ b/drivers/acpi/nfit/hyperv.h
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright(c) 2019 Microsoft Corporation. All rights reserved.
+ * Hyper-V specific definitions for _DSM of Hyper-V Virtual NVDIMM
+ *
+ * See http://www.uefi.org/RFIC_LIST (Virtual NVDIMM 0x1901)
+ */
+#ifndef _NFIT_HYPERV_H_
+#define _NFIT_HYPERV_H_
+
+#define ND_HYPERV_GET_UNSAFE_SHUTDOWN_COUNT 2
+
+struct nd_hyperv_shutdown_status {
+ union {
+ u32 status;
+ struct {
+ u16 general_err;
+ u8 func_err;
+ u8 vendor_err;
+ };
+ };
+ u32 shutdown_count;
+} __packed;
+
+
+#endif
--
2.19.1
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