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Subject[PATCH v3 6/8] efi: Decode additional IA32/X64 Bus Check fields
Date
From: Yazen Ghannam <yazen.ghannam@amd.com>

The "Participation Type", "Time Out", and "Address Space" fields are
unique to the IA32/X64 Bus Check structure. Print these fields.

Based on UEFI 2.7 Table 256. IA32/X64 Bus Check Structure

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
---
Link:
https://lkml.kernel.org/r/20180226193904.20532-7-Yazen.Ghannam@amd.com

v2->v3:
* Fix table number in commit message.

v1->v2:
* Add parantheses around "check" expression in macro.
* Fix indentation on multi-line statements.

drivers/firmware/efi/cper-x86.c | 44 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)

diff --git a/drivers/firmware/efi/cper-x86.c b/drivers/firmware/efi/cper-x86.c
index 260e4bf7773c..54bd32d241b7 100644
--- a/drivers/firmware/efi/cper-x86.c
+++ b/drivers/firmware/efi/cper-x86.c
@@ -41,6 +41,10 @@
#define CHECK_VALID_RESTARTABLE_IP BIT_ULL(6)
#define CHECK_VALID_OVERFLOW BIT_ULL(7)

+#define CHECK_VALID_BUS_PART_TYPE BIT_ULL(8)
+#define CHECK_VALID_BUS_TIME_OUT BIT_ULL(9)
+#define CHECK_VALID_BUS_ADDR_SPACE BIT_ULL(10)
+
#define CHECK_VALID_BITS(check) (((check) & GENMASK_ULL(15, 0)))
#define CHECK_TRANS_TYPE(check) (((check) & GENMASK_ULL(17, 16)) >> 16)
#define CHECK_OPERATION(check) (((check) & GENMASK_ULL(21, 18)) >> 18)
@@ -51,6 +55,10 @@
#define CHECK_RESTARTABLE_IP BIT_ULL(28)
#define CHECK_OVERFLOW BIT_ULL(29)

+#define CHECK_BUS_PART_TYPE(check) (((check) & GENMASK_ULL(31, 30)) >> 30)
+#define CHECK_BUS_TIME_OUT BIT_ULL(32)
+#define CHECK_BUS_ADDR_SPACE(check) (((check) & GENMASK_ULL(34, 33)) >> 33)
+
enum err_types {
ERR_TYPE_CACHE = 0,
ERR_TYPE_TLB,
@@ -91,6 +99,20 @@ static const char * const ia_check_op_strs[] = {
"snoop",
};

+static const char * const ia_check_bus_part_type_strs[] = {
+ "Local Processor originated request",
+ "Local Processor responded to request",
+ "Local Processor observed",
+ "Generic",
+};
+
+static const char * const ia_check_bus_addr_space_strs[] = {
+ "Memory Access",
+ "Reserved",
+ "I/O",
+ "Other Transaction",
+};
+
static inline void print_bool(char *str, const char *pfx, u64 check, u64 bit)
{
printk("%s%s: %s\n", pfx, str, (check & bit) ? "true" : "false");
@@ -141,6 +163,28 @@ static void print_err_info(const char *pfx, u8 err_type, u64 check)

if (validation_bits & CHECK_VALID_OVERFLOW)
print_bool("Overflow", pfx, check, CHECK_OVERFLOW);
+
+ if (err_type != ERR_TYPE_BUS)
+ return;
+
+ if (validation_bits & CHECK_VALID_BUS_PART_TYPE) {
+ u8 part_type = CHECK_BUS_PART_TYPE(check);
+
+ printk("%sParticipation Type: %u, %s\n", pfx, part_type,
+ part_type < ARRAY_SIZE(ia_check_bus_part_type_strs) ?
+ ia_check_bus_part_type_strs[part_type] : "unknown");
+ }
+
+ if (validation_bits & CHECK_VALID_BUS_TIME_OUT)
+ print_bool("Time Out", pfx, check, CHECK_BUS_TIME_OUT);
+
+ if (validation_bits & CHECK_VALID_BUS_ADDR_SPACE) {
+ u8 addr_space = CHECK_BUS_ADDR_SPACE(check);
+
+ printk("%sAddress Space: %u, %s\n", pfx, addr_space,
+ addr_space < ARRAY_SIZE(ia_check_bus_addr_space_strs) ?
+ ia_check_bus_addr_space_strs[addr_space] : "unknown");
+ }
}

void cper_print_proc_ia(const char *pfx, const struct cper_sec_proc_ia *proc)
--
2.14.1
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