Interfaces for when a new domain in the crashdump kernel needs some values from the panicked kernel's context entries. Signed-off-by: Bill Sumner --- drivers/iommu/intel-iommu.c | 46 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 73afed4..bde8f22 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -348,6 +348,7 @@ static inline int first_pte_in_page(struct dma_pte *pte) #ifdef CONFIG_CRASH_DUMP + /* * Fix Crashdump failure caused by leftover DMA through a hardware IOMMU * @@ -437,6 +438,16 @@ static int intel_iommu_copy_translation_tables(struct dmar_drhd_unit *drhd, struct root_entry **root_new_virt_p, int g_num_of_iommus); +static struct domain_values_entry *intel_iommu_did_to_domain_values_entry( + int did, struct intel_iommu *iommu); + +static int intel_iommu_get_dids_from_old_kernel(struct intel_iommu *iommu); + +static struct domain_values_entry *intel_iommu_did_to_domain_values_entry( + int did, struct intel_iommu *iommu); + +static int intel_iommu_get_dids_from_old_kernel(struct intel_iommu *iommu); + #endif /* CONFIG_CRASH_DUMP */ /* @@ -5230,4 +5241,39 @@ static int intel_iommu_copy_translation_tables(struct dmar_drhd_unit *drhd, return 0; } +/* + * Interfaces for when a new domain in the crashdump kernel needs some + * values from the panicked kernel's context entries + * + */ +static struct domain_values_entry *intel_iommu_did_to_domain_values_entry( + int did, struct intel_iommu *iommu) +{ + struct domain_values_entry *dve; /* iterator */ + + list_for_each_entry(dve, &domain_values_list[iommu->seq_id], link) + if (dve->did == did) + return dve; + return NULL; +} + +/* Mark domain-id's from old kernel as in-use on this iommu so that a new + * domain-id is allocated in the case where there is a device in the new kernel + * that was not in the old kernel -- and therefore a new domain-id is needed. + */ +static int intel_iommu_get_dids_from_old_kernel(struct intel_iommu *iommu) +{ + struct domain_values_entry *dve; /* iterator */ + + pr_info("IOMMU:%d Domain ids from panicked kernel:\n", iommu->seq_id); + + list_for_each_entry(dve, &domain_values_list[iommu->seq_id], link) { + set_bit(dve->did, iommu->domain_ids); + pr_info("DID did:%d(0x%4.4x)\n", dve->did, dve->did); + } + + pr_info("----------------------------------------\n"); + return 0; +} + #endif /* CONFIG_CRASH_DUMP */ -- 2.0.0-rc0