[PATCH V15 04/11] efi: parse ARM processor error

Borislav Petkov
2017-04-21T17:55:27Z

On Tue, Apr 18, 2017 at 05:05:16PM -0600, Tyler Baicar wrote:
> Add support for ARM Common Platform Error Record (CPER).
> UEFI 2.6 specification adds support for ARM specific
> processor error information to be reported as part of the
> CPER records. This provides more detail on for processor error logs.
>
> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
> Reviewed-by: James Morse <james.morse@arm.com>
> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
> drivers/firmware/efi/cper.c | 135 ++++++++++++++++++++++++++++++++++++++++++++
> include/linux/cper.h | 54 ++++++++++++++++++
> 2 files changed, 189 insertions(+)
>
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index 46585f9..f959185 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -110,12 +110,15 @@ void cper_print_bits(const char *pfx, unsigned int bits,
> static const char * const proc_type_strs[] = {
> "IA32/X64",
> "IA64",
> + "ARM",
> };
>
> static const char * const proc_isa_strs[] = {
> "IA32",
> "IA64",
> "X64",
> + "ARM A32/T32",
> + "ARM A64",
> };
>
> static const char * const proc_error_type_strs[] = {
> @@ -184,6 +187,128 @@ static void cper_print_proc_generic(const char *pfx,
> printk("%s""IP: 0x%016llx\n", pfx, proc->ip);
> }
>
> +#if defined(CONFIG_ARM64) || defined(CONFIG_ARM)
> +static const char * const arm_reg_ctx_strs[] = {
> + "AArch32 general purpose registers",
> + "AArch32 EL1 context registers",
> + "AArch32 EL2 context registers",
> + "AArch32 secure context registers",
> + "AArch64 general purpose registers",
> + "AArch64 EL1 context registers",
> + "AArch64 EL2 context registers",
> + "AArch64 EL3 context registers",
> + "Misc. system register structure",
> +};
> +
> +static void cper_print_proc_arm(const char *pfx,
> + const struct cper_sec_proc_arm *proc)
> +{
> + int i, len, max_ctx_type;
> + struct cper_arm_err_info *err_info;
> + struct cper_arm_ctx_info *ctx_info;
> + char newpfx[64];
> +
> + printk("%ssection length: %d\n", pfx, proc->section_length);

We need to dump section length because?

> + printk("%sMIDR: 0x%016llx\n", pfx, proc->midr);
> +
> + len = proc->section_length - (sizeof(*proc) +
> + proc->err_info_num * (sizeof(*err_info)));
> + if (len < 0) {
> + printk("%ssection length is too small\n", pfx);

Now here we *can* dump it.

> + printk("%sfirmware-generated error record is incorrect\n", pfx);
> + printk("%sERR_INFO_NUM is %d\n", pfx, proc->err_info_num);
> + return;
> + }
> +
> + if (proc->validation_bits & CPER_ARM_VALID_MPIDR)
> + printk("%sMPIDR: 0x%016llx\n", pfx, proc->mpidr);

<---- newline here.

Also, what is MPIDR and can it be written in a more user-friendly manner
and not be an abbreviation?

> + if (proc->validation_bits & CPER_ARM_VALID_AFFINITY_LEVEL)
> + printk("%serror affinity level: %d\n", pfx,
> + proc->affinity_level);
> + if (proc->validation_bits & CPER_ARM_VALID_RUNNING_STATE) {
> + printk("%srunning state: 0x%x\n", pfx, proc->running_state);
> + printk("%sPSCI state: %d\n", pfx, proc->psci_state);

One more abbreviation. Please consider whether having the abbreviations
or actually writing them out is more user-friendly.

> + }
> +
> + snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);

That INDENT_SP thing is just silly, someone should kill it.

> +
> + err_info = (struct cper_arm_err_info *)(proc + 1);
> + for (i = 0; i < proc->err_info_num; i++) {
> + printk("%sError info structure %d:\n", pfx, i);
> + printk("%sversion:%d\n", newpfx, err_info->version);
> + printk("%slength:%d\n", newpfx, err_info->length);

<---- newline here.

Why do we even dump version and info for *every* err_info structure?

> + if (err_info->validation_bits &
> + CPER_ARM_INFO_VALID_MULTI_ERR) {
> + if (err_info->multiple_error == 0)
> + printk("%ssingle error\n", newpfx);
> + else if (err_info->multiple_error == 1)
> + printk("%smultiple errors\n", newpfx);
> + else
> + printk("%smultiple errors count:%u\n",
> + newpfx, err_info->multiple_error);

So this can be simply: "num errors: %d", err_info->multiple_error+1...

Without checking CPER_ARM_INFO_VALID_MULTI_ERR.

> + }

<---- newline here.

> + if (err_info->validation_bits & CPER_ARM_INFO_VALID_FLAGS) {
> + if (err_info->flags & CPER_ARM_INFO_FLAGS_FIRST)
> + printk("%sfirst error captured\n", newpfx);
> + if (err_info->flags & CPER_ARM_INFO_FLAGS_LAST)
> + printk("%slast error captured\n", newpfx);
> + if (err_info->flags & CPER_ARM_INFO_FLAGS_PROPAGATED)
> + printk("%spropagated error captured\n",
> + newpfx);
> + if (err_info->flags & CPER_ARM_INFO_FLAGS_OVERFLOW)
> + printk("%soverflow occurred, error info is incomplete\n",
> + newpfx);
> + }

<---- newline here.

> + printk("%serror_type: %d, %s\n", newpfx, err_info->type,
> + err_info->type < ARRAY_SIZE(proc_error_type_strs) ?
> + proc_error_type_strs[err_info->type] : "unknown");
> + if (err_info->validation_bits & CPER_ARM_INFO_VALID_ERR_INFO)
> + printk("%serror_info: 0x%016llx\n", newpfx,
> + err_info->error_info);

err_info->error_info ?

What is that supposed to mean? A u64 value of some sorts.

> + if (err_info->validation_bits & CPER_ARM_INFO_VALID_VIRT_ADDR)
> + printk("%svirtual fault address: 0x%016llx\n",
> + newpfx, err_info->virt_fault_addr);
> + if (err_info->validation_bits &
> + CPER_ARM_INFO_VALID_PHYSICAL_ADDR)

Just let that line stick out.

> + printk("%sphysical fault address: 0x%016llx\n",
> + newpfx, err_info->physical_fault_addr);
> + err_info += 1;
> + }

<---- newline here.

That function is kinda missing newlines.

> + ctx_info = (struct cper_arm_ctx_info *)err_info;
> + max_ctx_type = ARRAY_SIZE(arm_reg_ctx_strs) - 1;
> + for (i = 0; i < proc->context_info_num; i++) {
> + int size = sizeof(*ctx_info) + ctx_info->size;
> +
> + printk("%sContext info structure %d:\n", pfx, i);
> + if (len < size) {
> + printk("%ssection length is too small\n", newpfx);
> + printk("%sfirmware-generated error record is incorrect\n", pfx);
> + return;
> + }
> + if (ctx_info->type > max_ctx_type) {
> + printk("%sInvalid context type: %d\n", newpfx,
> + ctx_info->type);
> + printk("%sMax context type: %d\n", newpfx,
> + max_ctx_type);
> + return;

You can combine those into:

printk("%sInvalid context type: %d (max: %d)\n",
newpfx, ctx_info->type, max_ctx_type);

> + }
> + printk("%sregister context type %d: %s\n", newpfx,
> + ctx_info->type, arm_reg_ctx_strs[ctx_info->type]);

Why dump the type as %d and as a string too? String should be enough, no?

> + print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, 4,
> + (ctx_info + 1), ctx_info->size, 0);
> + len -= size;
> + ctx_info = (struct cper_arm_ctx_info *)((long)ctx_info + size);
> + }
> +
> + if (len > 0) {
> + printk("%sVendor specific error info has %u bytes:\n", pfx,
> + len);
> + print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, 4, ctx_info,
> + len, true);

That looks like it should be a debug printk...

> + }
> +}
> +#endif
> +
> static const char * const mem_err_type_strs[] = {
> "unknown",
> "no error",
> @@ -461,6 +586,16 @@ static void cper_estatus_timestamp(const char *pfx,
> cper_print_pcie(newpfx, pcie, gdata);
> else
> goto err_section_too_small;
> + } else if ((IS_ENABLED(CONFIG_ARM64) || IS_ENABLED(CONFIG_ARM)) &&
> + !uuid_le_cmp(*sec_type, CPER_SEC_PROC_ARM)) {
> + struct cper_sec_proc_arm *arm_err;
> +
> + arm_err = acpi_hest_get_payload(gdata);

struct cper_sec_proc_arm *arm_err = acpi_hest_get_payload(gdata);

> + printk("%ssection_type: ARM processor error\n", newpfx);
> + if (gdata->error_data_length >= sizeof(*arm_err))
> + cper_print_proc_arm(newpfx, arm_err);
> + else
> + goto err_section_too_small;

You need to build-test your patches before submitting:

drivers/firmware/efi/cper.c: In function ?cper_estatus_print_section?:
drivers/firmware/efi/cper.c:596:4: error: implicit declaration of function ?cper_print_proc_arm? [-Werror=implicit-function-declaration]
cper_print_proc_arm(newpfx, arm_err);
^~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
make[3]: *** [drivers/firmware/efi/cper.o] Error 1
make[2]: *** [drivers/firmware/efi] Error 2
make[1]: *** [drivers/firmware] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [drivers] Error 2
make: *** Waiting for unfinished jobs....

this is a x86 build.

> } else
> printk("%s""section type: unknown, %pUl\n", newpfx, sec_type);
>
> diff --git a/include/linux/cper.h b/include/linux/cper.h
> index dcacb1a..85450f3 100644
> --- a/include/linux/cper.h
> +++ b/include/linux/cper.h
> @@ -180,6 +180,10 @@ enum {
> #define CPER_SEC_PROC_IPF \
> UUID_LE(0xE429FAF1, 0x3CB7, 0x11D4, 0x0B, 0xCA, 0x07, 0x00, \
> 0x80, 0xC7, 0x3C, 0x88, 0x81)
> +/* Processor Specific: ARM */
> +#define CPER_SEC_PROC_ARM \
> + UUID_LE(0xE19E3D16, 0xBC11, 0x11E4, 0x9C, 0xAA, 0xC2, 0x05, \
> + 0x1D, 0x5D, 0x46, 0xB0)
> /* Platform Memory */
> #define CPER_SEC_PLATFORM_MEM \
> UUID_LE(0xA5BC1114, 0x6F64, 0x4EDE, 0xB8, 0x63, 0x3E, 0x83, \
> @@ -255,6 +259,22 @@ enum {
>
> #define CPER_PCIE_SLOT_SHIFT 3
>
> +#define CPER_ARM_VALID_MPIDR 0x00000001
> +#define CPER_ARM_VALID_AFFINITY_LEVEL 0x00000002
> +#define CPER_ARM_VALID_RUNNING_STATE 0x00000004
> +#define CPER_ARM_VALID_VENDOR_INFO 0x00000008
> +
> +#define CPER_ARM_INFO_VALID_MULTI_ERR 0x0001
> +#define CPER_ARM_INFO_VALID_FLAGS 0x0002
> +#define CPER_ARM_INFO_VALID_ERR_INFO 0x0004
> +#define CPER_ARM_INFO_VALID_VIRT_ADDR 0x0008
> +#define CPER_ARM_INFO_VALID_PHYSICAL_ADDR 0x0010
> +
> +#define CPER_ARM_INFO_FLAGS_FIRST 0x0001
> +#define CPER_ARM_INFO_FLAGS_LAST 0x0002
> +#define CPER_ARM_INFO_FLAGS_PROPAGATED 0x0004
> +#define CPER_ARM_INFO_FLAGS_OVERFLOW 0x0008

For all of the above use BIT().

> +
> /*
> * All tables and structs must be byte-packed to match CPER
> * specification, since the tables are provided by the system BIOS
> @@ -340,6 +360,40 @@ struct cper_ia_proc_ctx {
> __u64 mm_reg_addr;
> };
>
> +/* ARM Processor Error Section */
> +struct cper_sec_proc_arm {
> + __u32 validation_bits;
> + __u16 err_info_num; /* Number of Processor Error Info */
> + __u16 context_info_num; /* Number of Processor Context Info Records*/
> + __u32 section_length;
> + __u8 affinity_level;
> + __u8 reserved[3]; /* must be zero */
> + __u64 mpidr;
> + __u64 midr;
> + __u32 running_state; /* Bit 0 set - Processor running. PSCI = 0 */
> + __u32 psci_state;

Align comments vertically pls.

> +};
> +
> +/* ARM Processor Error Information Structure */
> +struct cper_arm_err_info {
> + __u8 version;
> + __u8 length;
> + __u16 validation_bits;
> + __u8 type;
> + __u16 multiple_error;
> + __u8 flags;
> + __u64 error_info;
> + __u64 virt_fault_addr;
> + __u64 physical_fault_addr;
> +};
> +
> +/* ARM Processor Context Information Structure */
> +struct cper_arm_ctx_info {
> + __u16 version;
> + __u16 type;
> + __u32 size;
> +};

--
Regards/Gruss,
Boris.

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