platform/x86/intel/ifs: Add scan test support

In a core, the scan engine is shared between sibling cpus.

When a Scan test (for a particular core) is triggered by the user,
the scan chunks are executed on all the threads on the core using
stop_core_cpuslocked.

Scan may be aborted by some reasons. Scan test will be aborted in certain
circumstances such as when interrupt occurred or cpu does not have enough
power budget for scan. In this case, the kernel restart scan from the chunk
where it stopped. Scan will also be aborted when the test is failed. In
this case, the test is immediately stopped without retry.

Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jithu Joseph <jithu.joseph@intel.com>
Co-developed-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20220506225410.1652287-9-tony.luck@intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 44 insertions, 0 deletions

diff --git a/drivers/platform/x86/intel/ifs/ifs.h b/drivers/platform/x86/intel/ifs/ifs.h
index bed70dc1e5b7..b648cccda3ec 100644
--- a/drivers/platform/x86/intel/ifs/ifs.h
+++ b/drivers/platform/x86/intel/ifs/ifs.h
@@ -11,6 +11,11 @@
 #define MSR_SCAN_HASHES_STATUS			0x000002c3
 #define MSR_AUTHENTICATE_AND_COPY_CHUNK		0x000002c4
 #define MSR_CHUNKS_AUTHENTICATION_STATUS	0x000002c5
+#define MSR_ACTIVATE_SCAN			0x000002c6
+#define MSR_SCAN_STATUS				0x000002c7
+#define SCAN_NOT_TESTED				0
+#define SCAN_TEST_PASS				1
+#define SCAN_TEST_FAIL				2
 
 /* MSR_SCAN_HASHES_STATUS bit fields */
 union ifs_scan_hashes_status {
@@ -38,6 +43,40 @@ union ifs_chunks_auth_status {
 	};
 };
 
+/* MSR_ACTIVATE_SCAN bit fields */
+union ifs_scan {
+	u64	data;
+	struct {
+		u32	start	:8;
+		u32	stop	:8;
+		u32	rsvd	:16;
+		u32	delay	:31;
+		u32	sigmce	:1;
+	};
+};
+
+/* MSR_SCAN_STATUS bit fields */
+union ifs_status {
+	u64	data;
+	struct {
+		u32	chunk_num		:8;
+		u32	chunk_stop_index	:8;
+		u32	rsvd1			:16;
+		u32	error_code		:8;
+		u32	rsvd2			:22;
+		u32	control_error		:1;
+		u32	signature_error		:1;
+	};
+};
+
+/*
+ * Driver populated error-codes
+ * 0xFD: Test timed out before completing all the chunks.
+ * 0xFE: not all scan chunks were executed. Maximum forward progress retries exceeded.
+ */
+#define IFS_SW_TIMEOUT				0xFD
+#define IFS_SW_PARTIAL_COMPLETION		0xFE
+
 /**
  * struct ifs_data - attributes related to intel IFS driver
  * @integrity_cap_bit: MSR_INTEGRITY_CAPS bit enumerating this test
@@ -45,6 +84,8 @@ union ifs_chunks_auth_status {
  * @loaded: If a valid test binary has been loaded into the memory
  * @loading_error: Error occurred on another CPU while loading image
  * @valid_chunks: number of chunks which could be validated.
+ * @status: it holds simple status pass/fail/untested
+ * @scan_details: opaque scan status code from h/w
  */
 struct ifs_data {
 	int	integrity_cap_bit;
@@ -52,6 +93,8 @@ struct ifs_data {
 	bool	loaded;
 	bool	loading_error;
 	int	valid_chunks;
+	int	status;
+	u64	scan_details;
 };
 
 struct ifs_work {
@@ -73,5 +116,6 @@ static inline struct ifs_data *ifs_get_data(struct device *dev)
 }
 
 void ifs_load_firmware(struct device *dev);
+int do_core_test(int cpu, struct device *dev);
 
 #endif