Commit 333e581b authored by Vasant Hegde's avatar Vasant Hegde Committed by Joerg Roedel
Browse files

iommu/amd: Introduce per PCI segment irq_lookup_table 



This will replace global irq lookup table (irq_lookup_table).

Co-developed-by: default avatarSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: default avatarSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: default avatarVasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/20220706113825.25582-6-vasant.hegde@amd.com


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent eda797a2

drivers/iommu/amd/amd_iommu_types.h

+6 −0
Original line number Diff line number Diff line
@@ -565,6 +565,12 @@ struct amd_iommu_pci_seg { 
	 * device id.

	 */

	struct amd_iommu **rlookup_table;



	/*

	 * This table is used to find the irq remapping table for a given

	 * device id quickly.

	 */

	struct irq_remap_table **irq_lookup_table;

};



/*

drivers/iommu/amd/init.c

+27 −0
Original line number Diff line number Diff line
@@ -684,6 +684,26 @@ static inline void free_rlookup_table(struct amd_iommu_pci_seg *pci_seg) 
	pci_seg->rlookup_table = NULL;

}



static inline int __init alloc_irq_lookup_table(struct amd_iommu_pci_seg *pci_seg)

{

	pci_seg->irq_lookup_table = (void *)__get_free_pages(

					     GFP_KERNEL | __GFP_ZERO,

					     get_order(rlookup_table_size));

	kmemleak_alloc(pci_seg->irq_lookup_table,

		       rlookup_table_size, 1, GFP_KERNEL);

	if (pci_seg->irq_lookup_table == NULL)

		return -ENOMEM;



	return 0;

}



static inline void free_irq_lookup_table(struct amd_iommu_pci_seg *pci_seg)

{

	kmemleak_free(pci_seg->irq_lookup_table);

	free_pages((unsigned long)pci_seg->irq_lookup_table,

		   get_order(rlookup_table_size));

	pci_seg->irq_lookup_table = NULL;

}



/*

 * Allocates the command buffer. This buffer is per AMD IOMMU. We can
@@ -1535,6 +1555,7 @@ static void __init free_pci_segments(void) 


	for_each_pci_segment_safe(pci_seg, next) {

		list_del(&pci_seg->list);

		free_irq_lookup_table(pci_seg);

		free_rlookup_table(pci_seg);

		free_dev_table(pci_seg);

		kfree(pci_seg);
@@ -2900,6 +2921,7 @@ static int __init early_amd_iommu_init(void) 
		amd_iommu_irq_remap = check_ioapic_information();



	if (amd_iommu_irq_remap) {

		struct amd_iommu_pci_seg *pci_seg;

		/*

		 * Interrupt remapping enabled, create kmem_cache for the

		 * remapping tables.
@@ -2916,6 +2938,11 @@ static int __init early_amd_iommu_init(void) 
		if (!amd_iommu_irq_cache)

			goto out;



		for_each_pci_segment(pci_seg) {

			if (alloc_irq_lookup_table(pci_seg))

				goto out;

		}



		irq_lookup_table = (void *)__get_free_pages(

				GFP_KERNEL | __GFP_ZERO,

				get_order(rlookup_table_size));