Re: [PATCH V15 02/11] ras: acpi/apei: cper: add support for generic data v3 structure

From: Borislav Petkov
Date: Thu Apr 20 2017 - 07:22:37 EST

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On Tue, Apr 18, 2017 at 05:05:14PM -0600, Tyler Baicar wrote:
> The ACPI 6.1 spec adds a new version of the generic data structure.

which data structure? HEST?

> Add support to handle the new structure as well as properly verify
> and iterate through the generic data entries.
>
> Signed-off-by: Tyler Baicar <tbaicar@xxxxxxxxxxxxxx>
> CC: Jonathan (Zhixiong) Zhang <zjzhang@xxxxxxxxxxxxxx>
> Reviewed-by: James Morse <james.morse@xxxxxxx>
> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>

This is clearly a new version of the patch so Reviewed-by tags don't
apply anymore. Ditto for the next one. Remember to remove such tags in
the future when the patches are changed non-trivially in a following
iteration.

> ---
> drivers/acpi/apei/ghes.c | 6 +++---
> drivers/firmware/efi/cper.c | 37 ++++++++++++++++++++++---------------
> include/acpi/ghes.h | 22 ++++++++++++++++++++++
> 3 files changed, 47 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index 6d87ab7..dfb7dd2 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -429,7 +429,7 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int
> int flags = -1;
> int sec_sev = ghes_severity(gdata->error_severity);
> struct cper_sec_mem_err *mem_err;
> - mem_err = (struct cper_sec_mem_err *)(gdata + 1);
> + mem_err = acpi_hest_get_payload(gdata);

struct cper_sec_mem_err *mem_err = acpi_hest_get_payload(gdata);

while you're at it.

> if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
> return;
> @@ -466,7 +466,7 @@ static void ghes_do_proc(struct ghes *ghes,
> if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
> CPER_SEC_PLATFORM_MEM)) {
> struct cper_sec_mem_err *mem_err;
> - mem_err = (struct cper_sec_mem_err *)(gdata+1);
> + mem_err = acpi_hest_get_payload(gdata);

Ditto

+ add a \n here.

> ghes_edac_report_mem_error(ghes, sev, mem_err);
>
> arch_apei_report_mem_error(sev, mem_err);
> @@ -476,7 +476,7 @@ static void ghes_do_proc(struct ghes *ghes,
> else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
> CPER_SEC_PCIE)) {
> struct cper_sec_pcie *pcie_err;
> - pcie_err = (struct cper_sec_pcie *)(gdata+1);
> + pcie_err = acpi_hest_get_payload(gdata);

Ditto.

> if (sev == GHES_SEV_RECOVERABLE &&
> sec_sev == GHES_SEV_RECOVERABLE &&
> pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index d425374..8328a6f 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -32,6 +32,7 @@
> #include <linux/acpi.h>
> #include <linux/pci.h>
> #include <linux/aer.h>
> +#include <acpi/ghes.h>
>
> #define INDENT_SP " "
>
> @@ -386,8 +387,9 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
> pfx, pcie->bridge.secondary_status, pcie->bridge.control);
> }
>
> -static void cper_estatus_print_section(
> - const char *pfx, const struct acpi_hest_generic_data *gdata, int sec_no)
> +static void
> +cper_estatus_print_section(const char *pfx, struct acpi_hest_generic_data *gdata,
> + int sec_no)
> {
> uuid_le *sec_type = (uuid_le *)gdata->section_type;
> __u16 severity;
> @@ -403,14 +405,18 @@ static void cper_estatus_print_section(
>
> snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
> if (!uuid_le_cmp(*sec_type, CPER_SEC_PROC_GENERIC)) {
> - struct cper_sec_proc_generic *proc_err = (void *)(gdata + 1);
> + struct cper_sec_proc_generic *proc_err;
> +
> + proc_err = acpi_hest_get_payload(gdata);

Ditto.

> printk("%s""section_type: general processor error\n", newpfx);
> if (gdata->error_data_length >= sizeof(*proc_err))
> cper_print_proc_generic(newpfx, proc_err);
> else
> goto err_section_too_small;
> } else if (!uuid_le_cmp(*sec_type, CPER_SEC_PLATFORM_MEM)) {
> - struct cper_sec_mem_err *mem_err = (void *)(gdata + 1);
> + struct cper_sec_mem_err *mem_err;
> +
> + mem_err = acpi_hest_get_payload(gdata);

Ditto.

> printk("%s""section_type: memory error\n", newpfx);
> if (gdata->error_data_length >=
> sizeof(struct cper_sec_mem_err_old))
> @@ -419,7 +425,9 @@ static void cper_estatus_print_section(
> else
> goto err_section_too_small;
> } else if (!uuid_le_cmp(*sec_type, CPER_SEC_PCIE)) {
> - struct cper_sec_pcie *pcie = (void *)(gdata + 1);
> + struct cper_sec_pcie *pcie;
> +
> + pcie = acpi_hest_get_payload(gdata);

Ditto.

> printk("%s""section_type: PCIe error\n", newpfx);
> if (gdata->error_data_length >= sizeof(*pcie))
> cper_print_pcie(newpfx, pcie, gdata);
> @@ -438,7 +446,7 @@ void cper_estatus_print(const char *pfx,
> const struct acpi_hest_generic_status *estatus)
> {
> struct acpi_hest_generic_data *gdata;
> - unsigned int data_len, gedata_len;
> + unsigned int data_len;
> int sec_no = 0;
> char newpfx[64];
> __u16 severity;
> @@ -452,11 +460,10 @@ void cper_estatus_print(const char *pfx,
> data_len = estatus->data_length;
> gdata = (struct acpi_hest_generic_data *)(estatus + 1);
> snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
> - while (data_len >= sizeof(*gdata)) {
> - gedata_len = gdata->error_data_length;

<-- \n here while you're at it.

We have to start making this code more readable. It looks write-only
right now.

> + while (data_len >= acpi_hest_get_size(gdata)) {
> cper_estatus_print_section(newpfx, gdata, sec_no);
> - data_len -= gedata_len + sizeof(*gdata);
> - gdata = (void *)(gdata + 1) + gedata_len;
> + data_len -= acpi_hest_get_record_size(gdata);
> + gdata = acpi_hest_get_next(gdata);
> sec_no++;
> }
> }
> @@ -486,12 +493,12 @@ int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
> return rc;
> data_len = estatus->data_length;
> gdata = (struct acpi_hest_generic_data *)(estatus + 1);
> - while (data_len >= sizeof(*gdata)) {
> - gedata_len = gdata->error_data_length;
> - if (gedata_len > data_len - sizeof(*gdata))

Ditto.

> + while (data_len >= acpi_hest_get_size(gdata)) {
> + gedata_len = acpi_hest_get_error_length(gdata);
> + if (gedata_len > data_len - acpi_hest_get_size(gdata))
> return -EINVAL;

<-- \n here too

> - data_len -= gedata_len + sizeof(*gdata);
> - gdata = (void *)(gdata + 1) + gedata_len;
> + data_len -= acpi_hest_get_record_size(gdata);
> + gdata = acpi_hest_get_next(gdata);
> }
> if (data_len)
> return -EINVAL;
> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> index 68f088a..b89361a 100644
> --- a/include/acpi/ghes.h
> +++ b/include/acpi/ghes.h
> @@ -12,6 +12,20 @@
> #define GHES_TO_CLEAR 0x0001
> #define GHES_EXITING 0x0002
>
> +#define acpi_hest_get_error_length(gdata) \
> + (((struct acpi_hest_generic_data *)(gdata))->error_data_length)
> +#define acpi_hest_get_size(gdata) \
> + ((acpi_hest_get_version(gdata) >= 3) ? \
> + sizeof(struct acpi_hest_generic_data_v300) : \
> + sizeof(struct acpi_hest_generic_data))
> +#define acpi_hest_get_record_size(gdata) \
> + (acpi_hest_get_size(gdata) + \
> + acpi_hest_get_error_length(gdata))
> +#define acpi_hest_get_next(gdata) \
> + ((void *)(gdata) + acpi_hest_get_record_size(gdata))
> +#define acpi_hest_get_version(gdata) \
> + (gdata->revision >> 8)

Make all those inline functions.

--
Regards/Gruss,
Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

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In reply to: Tyler Baicar: "[PATCH V15 02/11] ras: acpi/apei: cper: add support for generic data v3 structure"
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