linux/drivers/acpi/hest.c

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PCI: PCIe AER: honor ACPI HEST FIRMWARE FIRST mode Feedback from Hidetoshi Seto and Kenji Kaneshige incorporated. This correctly handles PCI-X bridges, PCIe root ports and endpoints, and prints debug messages when invalid/reserved types are found in the HEST. PCI devices not in domain/segment 0 are not represented in HEST, thus will be ignored. Today, the PCIe Advanced Error Reporting (AER) driver attaches itself to every PCIe root port for which BIOS reports it should, via ACPI _OSC. However, _OSC alone is insufficient for newer BIOSes. Part of ACPI 4.0 is the new APEI (ACPI Platform Error Interfaces) which is a way for OS and BIOS to handshake over which errors for which components each will handle. One table in ACPI 4.0 is the Hardware Error Source Table (HEST), where BIOS can define that errors for certain PCIe devices (or all devices), should be handled by BIOS ("Firmware First mode"), rather than be handled by the OS. Dell PowerEdge 11G server BIOS defines Firmware First mode in HEST, so that it may manage such errors, log them to the System Event Log, and possibly take other actions. The aer driver should honor this, and not attach itself to devices noted as such. Furthermore, Kenji Kaneshige reminded us to disallow changing the AER registers when respecting Firmware First mode. Platform firmware is expected to manage these, and if changes to them are allowed, it could break that firmware's behavior. The HEST parsing code may be replaced in the future by a more feature-rich implementation. This patch provides the minimum needed to prevent breakage until that implementation is available. Reviewed-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Reviewed-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Signed-off-by: Matt Domsch <Matt_Domsch@dell.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-11-02 18:51:24 +01:00
#include <linux/acpi.h>
#include <linux/pci.h>
#define PREFIX "ACPI: "
static inline unsigned long parse_acpi_hest_ia_machine_check(struct acpi_hest_ia_machine_check *p)
{
return sizeof(*p) +
(sizeof(struct acpi_hest_ia_error_bank) * p->num_hardware_banks);
}
static inline unsigned long parse_acpi_hest_ia_corrected(struct acpi_hest_ia_corrected *p)
{
return sizeof(*p) +
(sizeof(struct acpi_hest_ia_error_bank) * p->num_hardware_banks);
}
static inline unsigned long parse_acpi_hest_ia_nmi(struct acpi_hest_ia_nmi *p)
{
return sizeof(*p);
}
static inline unsigned long parse_acpi_hest_generic(struct acpi_hest_generic *p)
{
return sizeof(*p);
}
static inline unsigned int hest_match_pci(struct acpi_hest_aer_common *p, struct pci_dev *pci)
{
return (0 == pci_domain_nr(pci->bus) &&
p->bus == pci->bus->number &&
p->device == PCI_SLOT(pci->devfn) &&
p->function == PCI_FUNC(pci->devfn));
}
static unsigned long parse_acpi_hest_aer(void *hdr, int type, struct pci_dev *pci, int *firmware_first)
{
struct acpi_hest_aer_common *p = hdr + sizeof(struct acpi_hest_header);
unsigned long rc=0;
u8 pcie_type = 0;
u8 bridge = 0;
switch (type) {
case ACPI_HEST_TYPE_AER_ROOT_PORT:
rc = sizeof(struct acpi_hest_aer_root);
pcie_type = PCI_EXP_TYPE_ROOT_PORT;
break;
case ACPI_HEST_TYPE_AER_ENDPOINT:
rc = sizeof(struct acpi_hest_aer);
pcie_type = PCI_EXP_TYPE_ENDPOINT;
break;
case ACPI_HEST_TYPE_AER_BRIDGE:
rc = sizeof(struct acpi_hest_aer_bridge);
if ((pci->class >> 16) == PCI_BASE_CLASS_BRIDGE)
bridge = 1;
break;
}
if (p->flags & ACPI_HEST_GLOBAL) {
if ((pci->is_pcie && (pci->pcie_type == pcie_type)) || bridge)
*firmware_first = !!(p->flags & ACPI_HEST_FIRMWARE_FIRST);
}
else
if (hest_match_pci(p, pci))
*firmware_first = !!(p->flags & ACPI_HEST_FIRMWARE_FIRST);
return rc;
}
static int acpi_hest_firmware_first(struct acpi_table_header *stdheader, struct pci_dev *pci)
{
struct acpi_table_hest *hest = (struct acpi_table_hest *)stdheader;
void *p = (void *)hest + sizeof(*hest); /* defined by the ACPI 4.0 spec */
struct acpi_hest_header *hdr = p;
int i;
int firmware_first = 0;
static unsigned char printed_unused = 0;
static unsigned char printed_reserved = 0;
for (i=0, hdr=p; p < (((void *)hest) + hest->header.length) && i < hest->error_source_count; i++) {
switch (hdr->type) {
case ACPI_HEST_TYPE_IA32_CHECK:
p += parse_acpi_hest_ia_machine_check(p);
break;
case ACPI_HEST_TYPE_IA32_CORRECTED_CHECK:
p += parse_acpi_hest_ia_corrected(p);
break;
case ACPI_HEST_TYPE_IA32_NMI:
p += parse_acpi_hest_ia_nmi(p);
break;
/* These three should never appear */
case ACPI_HEST_TYPE_NOT_USED3:
case ACPI_HEST_TYPE_NOT_USED4:
case ACPI_HEST_TYPE_NOT_USED5:
if (!printed_unused) {
printk(KERN_DEBUG PREFIX
"HEST Error Source list contains an obsolete type (%d).\n", hdr->type);
printed_unused = 1;
}
break;
case ACPI_HEST_TYPE_AER_ROOT_PORT:
case ACPI_HEST_TYPE_AER_ENDPOINT:
case ACPI_HEST_TYPE_AER_BRIDGE:
p += parse_acpi_hest_aer(p, hdr->type, pci, &firmware_first);
break;
case ACPI_HEST_TYPE_GENERIC_ERROR:
p += parse_acpi_hest_generic(p);
break;
/* These should never appear either */
case ACPI_HEST_TYPE_RESERVED:
default:
if (!printed_reserved) {
printk(KERN_DEBUG PREFIX
"HEST Error Source list contains a reserved type (%d).\n", hdr->type);
printed_reserved = 1;
}
break;
}
}
return firmware_first;
}
int acpi_hest_firmware_first_pci(struct pci_dev *pci)
{
acpi_status status = AE_NOT_FOUND;
struct acpi_table_header *hest = NULL;
status = acpi_get_table(ACPI_SIG_HEST, 1, &hest);
if (ACPI_SUCCESS(status)) {
if (acpi_hest_firmware_first(hest, pci)) {
return 1;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(acpi_hest_firmware_first_pci);