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Subject[PATCH v5 4/6] fpga: m10bmc-sec: expose max10 canceled keys in sysfs
Date
Extend the MAX10 BMC Secure Update driver to provide sysfs
files to expose the canceled code signing key (CSK) bit
vectors. These use the standard bitmap list format
(e.g. 1,2-6,9).

Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Reviewed-by: Tom Rix <trix@redhat.com>
---
v5:
- No change
v4:
- Moved sysfs files for displaying the code-signing-key (CSK)
cancellation vectors from the FPGA Security Manger class driver
to here. The m10bmc_csk_vector() and m10bmc_csk_cancel_nbits()
functions are removed and the functionality from these functions
is moved into a show_canceled_csk() function for for displaying
the CSK vectors.
- Added ABI documentation for new sysfs entries
v3:
- Changed: iops -> sops, imgr -> smgr, IFPGA_ -> FPGA_, ifpga_ to fpga_
- Changed "MAX10 BMC Secure Engine driver" to "MAX10 BMC Secure Update
driver"
- Removed wrapper functions (m10bmc_raw_*, m10bmc_sys_*). The
underlying functions are now called directly.
- Renamed get_csk_vector() to m10bmc_csk_vector()
v2:
- Replaced small function-creation macros for explicit function
declarations.
- Fixed get_csk_vector() function to properly apply the stride
variable in calls to m10bmc_raw_bulk_read()
- Added m10bmc_ prefix to functions in m10bmc_iops structure
---
.../testing/sysfs-driver-intel-m10-bmc-secure | 24 ++++++++++
drivers/fpga/intel-m10-bmc-secure.c | 46 +++++++++++++++++++
2 files changed, 70 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure b/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure
index 73a3aba750e8..610f19569b5f 100644
--- a/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure
+++ b/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure
@@ -28,6 +28,30 @@ Description: Read only. Returns the root entry hash for the BMC image
underlying device supports it.
Format: "0x%x".

+What: /sys/bus/platform/devices/n3000bmc-secure.*.auto/security/sr_canceled_csks
+Date: Oct 2020
+KernelVersion: 5.11
+Contact: Russ Weight <russell.h.weight@intel.com>
+Description: Read only. Returns a list of indices for canceled code
+ signing keys for the static region. The standard bitmap
+ list format is used (e.g. "1,2-6,9").
+
+What: /sys/bus/platform/devices/n3000bmc-secure.*.auto/security/pr_canceled_csks
+Date: Oct 2020
+KernelVersion: 5.11
+Contact: Russ Weight <russell.h.weight@intel.com>
+Description: Read only. Returns a list of indices for canceled code
+ signing keys for the partial reconfiguration region. The
+ standard bitmap list format is used (e.g. "1,2-6,9").
+
+What: /sys/bus/platform/devices/n3000bmc-secure.*.auto/security/bmc_canceled_csks
+Date: Oct 2020
+KernelVersion: 5.11
+Contact: Russ Weight <russell.h.weight@intel.com>
+Description: Read only. Returns a list of indices for canceled code
+ signing keys for the BMC. The standard bitmap list format
+ is used (e.g. "1,2-6,9").
+
What: /sys/bus/platform/devices/n3000bmc-secure.*.auto/security/flash_count
Date: Oct 2020
KernelVersion: 5.11
diff --git a/drivers/fpga/intel-m10-bmc-secure.c b/drivers/fpga/intel-m10-bmc-secure.c
index 6ad897001086..689da5bc6461 100644
--- a/drivers/fpga/intel-m10-bmc-secure.c
+++ b/drivers/fpga/intel-m10-bmc-secure.c
@@ -78,6 +78,49 @@ DEVICE_ATTR_SEC_REH_RO(bmc, BMC_PROG_MAGIC, BMC_PROG_ADDR, BMC_REH_ADDR);
DEVICE_ATTR_SEC_REH_RO(sr, SR_PROG_MAGIC, SR_PROG_ADDR, SR_REH_ADDR);
DEVICE_ATTR_SEC_REH_RO(pr, PR_PROG_MAGIC, PR_PROG_ADDR, PR_REH_ADDR);

+#define CSK_BIT_LEN 128U
+#define CSK_32ARRAY_SIZE DIV_ROUND_UP(CSK_BIT_LEN, 32)
+
+static ssize_t
+show_canceled_csk(struct device *dev, u32 addr, char *buf)
+{
+ unsigned int i, stride, size = CSK_32ARRAY_SIZE * sizeof(u32);
+ struct m10bmc_sec *sec = dev_get_drvdata(dev);
+ DECLARE_BITMAP(csk_map, CSK_BIT_LEN);
+ __le32 csk_le32[CSK_32ARRAY_SIZE];
+ u32 csk32[CSK_32ARRAY_SIZE];
+ int ret;
+
+ stride = regmap_get_reg_stride(sec->m10bmc->regmap);
+
+ ret = regmap_bulk_read(sec->m10bmc->regmap, addr, csk_le32, size / stride);
+ if (ret) {
+ dev_err(sec->dev, "failed to read CSK vector: %x cnt %x: %d\n",
+ addr, size / stride, ret);
+ return ret;
+ }
+
+ for (i = 0; i < CSK_32ARRAY_SIZE; i++)
+ csk32[i] = le32_to_cpu(((csk_le32[i])));
+
+ bitmap_from_arr32(csk_map, csk32, CSK_BIT_LEN);
+ bitmap_complement(csk_map, csk_map, CSK_BIT_LEN);
+ return bitmap_print_to_pagebuf(1, buf, csk_map, CSK_BIT_LEN);
+}
+
+#define DEVICE_ATTR_SEC_CSK_RO(_name, _addr) \
+static ssize_t _name##_canceled_csks_show(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ return show_canceled_csk(dev, _addr, buf); } \
+static DEVICE_ATTR_RO(_name##_canceled_csks)
+
+#define CSK_VEC_OFFSET 0x34
+
+DEVICE_ATTR_SEC_CSK_RO(bmc, BMC_PROG_ADDR + CSK_VEC_OFFSET);
+DEVICE_ATTR_SEC_CSK_RO(sr, SR_PROG_ADDR + CSK_VEC_OFFSET);
+DEVICE_ATTR_SEC_CSK_RO(pr, PR_PROG_ADDR + CSK_VEC_OFFSET);
+
#define FLASH_COUNT_SIZE 4096 /* count stored as inverted bit vector */

static ssize_t flash_count_show(struct device *dev,
@@ -115,6 +158,9 @@ static struct attribute *m10bmc_security_attrs[] = {
&dev_attr_bmc_root_entry_hash.attr,
&dev_attr_sr_root_entry_hash.attr,
&dev_attr_pr_root_entry_hash.attr,
+ &dev_attr_sr_canceled_csks.attr,
+ &dev_attr_pr_canceled_csks.attr,
+ &dev_attr_bmc_canceled_csks.attr,
NULL,
};

--
2.25.1
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