Hi Dongdong,
On 06/13/2016 09:02 AM, Dongdong Liu wrote:
diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c index d3c3e85..49612b3 100644 --- a/drivers/acpi/pci_mcfg.c +++ b/drivers/acpi/pci_mcfg.c @@ -22,6 +22,10 @@ #include <linux/kernel.h> #include <linux/pci.h> #include <linux/pci-acpi.h> +#include <linux/pci-ecam.h>
+/* Root pointer to the mapped MCFG table */ +static struct acpi_table_mcfg *mcfg_table; /* Structure to hold entries from the MCFG table */ struct mcfg_entry { @@ -35,6 +39,38 @@ struct mcfg_entry { /* List to save mcfg entries */ static LIST_HEAD(pci_mcfg_list); +extern struct pci_cfg_fixup __start_acpi_mcfg_fixups[]; +extern struct pci_cfg_fixup __end_acpi_mcfg_fixups[];
+struct pci_ecam_ops *pci_mcfg_get_ops(struct acpi_pci_root *root) +{
- int bus_num = root->secondary.start;
- int domain = root->segment;
- struct pci_cfg_fixup *f;
- if (!mcfg_table)
return &pci_generic_ecam_ops;- /*
* Match against platform specific quirks and return corresponding* CAM ops.** First match against PCI topology <domain:bus> then use OEM ID and* OEM revision from MCFG table standard header.*/- for (f = __start_acpi_mcfg_fixups; f < __end_acpi_mcfg_fixups; f++) {
if ((f->domain == domain || f->domain == PCI_MCFG_DOMAIN_ANY) &&(f->bus_num == bus_num || f->bus_num == PCI_MCFG_BUS_ANY) &&(!strncmp(f->oem_id, mcfg_table->header.oem_id,ACPI_OEM_ID_SIZE)) &&(!strncmp(f->oem_table_id, mcfg_table->header.oem_table_id,ACPI_OEM_TABLE_ID_SIZE)))
This would just be a small convenience, but if the character count used here were
min(strlen(f->oem_id), ACPI_OEM_ID_SIZE)
then the parameters to DECLARE_ACPI_MCFG_FIXUP macro could be substrings and wouldn't need to be padded out to the full length.
return f->ops;- }
- /* No quirks, use ECAM */
- return &pci_generic_ecam_ops;
+}
diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h index 7d63a66..088a1da 100644 --- a/include/linux/pci-acpi.h +++ b/include/linux/pci-acpi.h @@ -25,6 +25,7 @@ static inline acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev) extern phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle); extern phys_addr_t pci_mcfg_lookup(u16 domain, struct resource *bus_res); +extern struct pci_ecam_ops *pci_mcfg_get_ops(struct acpi_pci_root *root); static inline acpi_handle acpi_find_root_bridge_handle(struct pci_dev *pdev) { @@ -72,6 +73,25 @@ struct acpi_pci_root_ops { int (*prepare_resources)(struct acpi_pci_root_info *info); }; +struct pci_cfg_fixup {
- struct pci_ecam_ops *ops;
- char *oem_id;
- char *oem_table_id;
- int domain;
- int bus_num;
+};
+#define PCI_MCFG_DOMAIN_ANY -1 +#define PCI_MCFG_BUS_ANY -1
+/* Designate a routine to fix up buggy MCFG */ +#define DECLARE_ACPI_MCFG_FIXUP(ops, oem_id, oem_table_id, dom, bus) \
- static const struct pci_cfg_fixup \
- __mcfg_fixup_##oem_id##oem_table_id##dom##bus \
I'm not entirely sure that this is the right fix--I'm pretty blindly following a GCC documentation suggestion [1]--but removing the first two preprocessor concatenation operators "##" solved the following build error for me.
include/linux/pci-acpi.h:90:2: error: pasting "__mcfg_fixup_" and ""QCOM"" does not give a valid preprocessing token __mcfg_fixup_##oem_id##oem_table_id##dom##bus \ ^ arch/arm64/kernel/pci.c:225:1: note: in expansion of macro ‘DECLARE_ACPI_MCFG_FIXUP’ DECLARE_ACPI_MCFG_FIXUP(&pci_32b_ecam_ops, "QCOM", "QDF2432", PCI_MCFG_DOMAIN_ANY, PCI_MCFG_BUS_ANY); ^ arch/arm64/kernel/pci.c:225:44: error: pasting ""QCOM"" and ""QDF2432"" does not give a valid preprocessing token DECLARE_ACPI_MCFG_FIXUP(&pci_32b_ecam_ops, "QCOM", "QDF2432", PCI_MCFG_DOMAIN_ANY, PCI_MCFG_BUS_ANY); ^ include/linux/pci-acpi.h:90:17: note: in definition of macro ‘DECLARE_ACPI_MCFG_FIXUP’ __mcfg_fixup_##oem_id##oem_table_id##dom##bus \ ^ arch/arm64/kernel/pci.c:225:52: error: pasting ""QDF2432"" and "PCI_MCFG_DOMAIN_ANY" does not give a valid preprocessi ng token DECLARE_ACPI_MCFG_FIXUP(&pci_32b_ecam_ops, "QCOM", "QDF2432", PCI_MCFG_DOMAIN_ANY, PCI_MCFG_BUS_ANY); ^ include/linux/pci-acpi.h:90:25: note: in definition of macro ‘DECLARE_ACPI_MCFG_FIXUP’ __mcfg_fixup_##oem_id##oem_table_id##dom##bus \ ^ arch/arm64/kernel/pci.c:225:44: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before string constant DECLARE_ACPI_MCFG_FIXUP(&pci_32b_ecam_ops, "QCOM", "QDF2432", PCI_MCFG_DOMAIN_ANY, PCI_MCFG_BUS_ANY); ^ include/linux/pci-acpi.h:90:17: note: in definition of macro ‘DECLARE_ACPI_MCFG_FIXUP’ __mcfg_fixup_##oem_id##oem_table_id##dom##bus \ ^ make[1]: *** [arch/arm64/kernel/pci.o] Error 1 make: *** [arch/arm64/kernel] Error 2
1. https://gcc.gnu.org/onlinedocs/cpp/Concatenation.html#Concatenation
- __used __attribute__((__section__(".acpi_fixup_mcfg"), \
aligned((sizeof(void *))))) = \- { ops, oem_id, oem_table_id, dom, bus };
extern int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info); extern struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, struct acpi_pci_root_ops *ops,
Thanks, Cov