iommu/amd: Convert to use per PCI segment irq_lookup_table

Then, remove the global irq_lookup_table.

Co-developed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/20220706113825.25582-15-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index 8d2d5fb..ca1a3d5 100644 (file)
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -445,8 +445,6 @@ struct irq_remap_table {
        u32 *table;
 };
 
-extern struct irq_remap_table **irq_lookup_table;
-
 /* Interrupt remapping feature used? */
 extern bool amd_iommu_irq_remap;
 

diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 2f1cdc8..a60bb6c 100644 (file)
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -207,12 +207,6 @@ u16 *amd_iommu_alias_table;
 struct amd_iommu **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;
-
-/*
  * AMD IOMMU allows up to 2^16 different protection domains. This is a bitmap
  * to know which ones are already in use.
  */
@@ -2789,11 +2783,6 @@ static struct syscore_ops amd_iommu_syscore_ops = {
 
 static void __init free_iommu_resources(void)
 {
-       kmemleak_free(irq_lookup_table);
-       free_pages((unsigned long)irq_lookup_table,
-                  get_order(rlookup_table_size));
-       irq_lookup_table = NULL;
-
        kmem_cache_destroy(amd_iommu_irq_cache);
        amd_iommu_irq_cache = NULL;
 
@@ -3014,14 +3003,6 @@ static int __init early_amd_iommu_init(void)
                        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));
-               kmemleak_alloc(irq_lookup_table, rlookup_table_size,
-                              1, GFP_KERNEL);
-               if (!irq_lookup_table)
-                       goto out;
        }
 
        ret = init_memory_definitions(ivrs_base);

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 53ccee5..cfecd07 100644 (file)
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2732,16 +2732,18 @@ static void set_dte_irq_entry(u16 devid, struct irq_remap_table *table)
        amd_iommu_dev_table[devid].data[2] = dte;
 }
 
-static struct irq_remap_table *get_irq_table(u16 devid)
+static struct irq_remap_table *get_irq_table(struct amd_iommu *iommu, u16 devid)
 {
        struct irq_remap_table *table;
+       struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;
 
        if (WARN_ONCE(!amd_iommu_rlookup_table[devid],
                      "%s: no iommu for devid %x\n", __func__, devid))
                return NULL;
 
-       table = irq_lookup_table[devid];
-       if (WARN_ONCE(!table, "%s: no table for devid %x\n", __func__, devid))
+       table = pci_seg->irq_lookup_table[devid];
+       if (WARN_ONCE(!table, "%s: no table for devid %x:%x\n",
+                     __func__, pci_seg->id, devid))
                return NULL;
 
        return table;
@@ -2774,7 +2776,9 @@ static struct irq_remap_table *__alloc_irq_table(void)
 static void set_remap_table_entry(struct amd_iommu *iommu, u16 devid,
                                  struct irq_remap_table *table)
 {
-       irq_lookup_table[devid] = table;
+       struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;
+
+       pci_seg->irq_lookup_table[devid] = table;
        set_dte_irq_entry(devid, table);
        iommu_flush_dte(iommu, devid);
 }
@@ -2783,8 +2787,14 @@ static int set_remap_table_entry_alias(struct pci_dev *pdev, u16 alias,
                                       void *data)
 {
        struct irq_remap_table *table = data;
+       struct amd_iommu_pci_seg *pci_seg;
+       struct amd_iommu *iommu = rlookup_amd_iommu(&pdev->dev);
 
-       irq_lookup_table[alias] = table;
+       if (!iommu)
+               return -EINVAL;
+
+       pci_seg = iommu->pci_seg;
+       pci_seg->irq_lookup_table[alias] = table;
        set_dte_irq_entry(alias, table);
 
        iommu_flush_dte(amd_iommu_rlookup_table[alias], alias);
@@ -2808,12 +2818,12 @@ static struct irq_remap_table *alloc_irq_table(u16 devid, struct pci_dev *pdev)
                goto out_unlock;
 
        pci_seg = iommu->pci_seg;
-       table = irq_lookup_table[devid];
+       table = pci_seg->irq_lookup_table[devid];
        if (table)
                goto out_unlock;
 
        alias = pci_seg->alias_table[devid];
-       table = irq_lookup_table[alias];
+       table = pci_seg->irq_lookup_table[alias];
        if (table) {
                set_remap_table_entry(iommu, devid, table);
                goto out_wait;
@@ -2827,11 +2837,11 @@ static struct irq_remap_table *alloc_irq_table(u16 devid, struct pci_dev *pdev)
 
        spin_lock_irqsave(&iommu_table_lock, flags);
 
-       table = irq_lookup_table[devid];
+       table = pci_seg->irq_lookup_table[devid];
        if (table)
                goto out_unlock;
 
-       table = irq_lookup_table[alias];
+       table = pci_seg->irq_lookup_table[alias];
        if (table) {
                set_remap_table_entry(iommu, devid, table);
                goto out_wait;
@@ -2925,7 +2935,7 @@ static int modify_irte_ga(u16 devid, int index, struct irte_ga *irte,
        if (iommu == NULL)
                return -EINVAL;
 
-       table = get_irq_table(devid);
+       table = get_irq_table(iommu, devid);
        if (!table)
                return -ENOMEM;
 
@@ -2966,7 +2976,7 @@ static int modify_irte(u16 devid, int index, union irte *irte)
        if (iommu == NULL)
                return -EINVAL;
 
-       table = get_irq_table(devid);
+       table = get_irq_table(iommu, devid);
        if (!table)
                return -ENOMEM;
 
@@ -2990,7 +3000,7 @@ static void free_irte(u16 devid, int index)
        if (iommu == NULL)
                return;
 
-       table = get_irq_table(devid);
+       table = get_irq_table(iommu, devid);
        if (!table)
                return;
 
@@ -3625,7 +3635,7 @@ int amd_iommu_update_ga(int cpu, bool is_run, void *data)
        if (!iommu)
                return -ENODEV;
 
-       table = get_irq_table(devid);
+       table = get_irq_table(iommu, devid);
        if (!table)
                return -ENODEV;