[Xen-changelog] [xen staging] AMD/IOMMU: don't needlessly log headers when dumping IRTs

[patchbot@xxxxxxx]

commit b28ae8b23cbc40202e6de3017f11bdacac9d9590
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Jul 31 13:28:42 2019 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Jul 31 13:28:42 2019 +0200

    AMD/IOMMU: don't needlessly log headers when dumping IRTs
    
    Log SBDF headers only when there are actual IRTEs to log. This is
    particularly important for the total volume of output when the ACPI
    tables describe far more than just the existing devices. On my Rome
    system so far there was one line for every function of every device on
    all 256 buses of segment 0, with extremely few exceptions (like the
    IOMMUs themselves).
    
    Also only log one of the "per-device" or "shared" overall headers.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Brian Woods <brian.woods@xxxxxxx>
---
 xen/drivers/passthrough/amd/iommu_intr.c | 57 ++++++++++++++++++--------------
 1 file changed, 32 insertions(+), 25 deletions(-)

diff --git a/xen/drivers/passthrough/amd/iommu_intr.c 
b/xen/drivers/passthrough/amd/iommu_intr.c
index f5685506c9..35bcd3c268 100644
--- a/xen/drivers/passthrough/amd/iommu_intr.c
+++ b/xen/drivers/passthrough/amd/iommu_intr.c
@@ -883,7 +883,8 @@ int __init amd_setup_hpet_msi(struct msi_desc *msi_desc)
 }
 
 static void dump_intremap_table(const struct amd_iommu *iommu,
-                                union irte_cptr tbl)
+                                union irte_cptr tbl,
+                                const struct ivrs_mappings *ivrs_mapping)
 {
     unsigned int count;
 
@@ -892,19 +893,25 @@ static void dump_intremap_table(const struct amd_iommu 
*iommu,
 
     for ( count = 0; count < INTREMAP_ENTRIES; count++ )
     {
-        if ( iommu->ctrl.ga_en )
-        {
-            if ( !tbl.ptr128[count].raw[0] && !tbl.ptr128[count].raw[1] )
+        if ( iommu->ctrl.ga_en
+             ? !tbl.ptr128[count].raw[0] && !tbl.ptr128[count].raw[1]
+             : !tbl.ptr32[count].raw )
                 continue;
+
+        if ( ivrs_mapping )
+        {
+            printk("  %04x:%02x:%02x:%u:\n", iommu->seg,
+                   PCI_BUS(ivrs_mapping->dte_requestor_id),
+                   PCI_SLOT(ivrs_mapping->dte_requestor_id),
+                   PCI_FUNC(ivrs_mapping->dte_requestor_id));
+            ivrs_mapping = NULL;
+        }
+
+        if ( iommu->ctrl.ga_en )
             printk("    IRTE[%03x] %016lx_%016lx\n",
                    count, tbl.ptr128[count].raw[1], tbl.ptr128[count].raw[0]);
-        }
         else
-        {
-            if ( !tbl.ptr32[count].raw )
-                continue;
             printk("    IRTE[%03x] %08x\n", count, tbl.ptr32[count].raw);
-        }
     }
 }
 
@@ -916,13 +923,8 @@ static int dump_intremap_mapping(const struct amd_iommu 
*iommu,
     if ( !ivrs_mapping )
         return 0;
 
-    printk("  %04x:%02x:%02x:%u:\n", iommu->seg,
-           PCI_BUS(ivrs_mapping->dte_requestor_id),
-           PCI_SLOT(ivrs_mapping->dte_requestor_id),
-           PCI_FUNC(ivrs_mapping->dte_requestor_id));
-
     spin_lock_irqsave(&(ivrs_mapping->intremap_lock), flags);
-    dump_intremap_table(iommu, ivrs_mapping->intremap_table);
+    dump_intremap_table(iommu, ivrs_mapping->intremap_table, ivrs_mapping);
     spin_unlock_irqrestore(&(ivrs_mapping->intremap_lock), flags);
 
     process_pending_softirqs();
@@ -932,17 +934,22 @@ static int dump_intremap_mapping(const struct amd_iommu 
*iommu,
 
 static void dump_intremap_tables(unsigned char key)
 {
-    unsigned long flags;
-
-    printk("--- Dumping Per-dev IOMMU Interrupt Remapping Table ---\n");
+    if ( !shared_intremap_table )
+    {
+        printk("--- Dumping Per-dev IOMMU Interrupt Remapping Table ---\n");
 
-    iterate_ivrs_entries(dump_intremap_mapping);
+        iterate_ivrs_entries(dump_intremap_mapping);
+    }
+    else
+    {
+        unsigned long flags;
 
-    printk("--- Dumping Shared IOMMU Interrupt Remapping Table ---\n");
+        printk("--- Dumping Shared IOMMU Interrupt Remapping Table ---\n");
 
-    spin_lock_irqsave(&shared_intremap_lock, flags);
-    dump_intremap_table(list_first_entry(&amd_iommu_head, struct amd_iommu,
-                                         list),
-                        shared_intremap_table);
-    spin_unlock_irqrestore(&shared_intremap_lock, flags);
+        spin_lock_irqsave(&shared_intremap_lock, flags);
+        dump_intremap_table(list_first_entry(&amd_iommu_head, struct amd_iommu,
+                                             list),
+                            shared_intremap_table, NULL);
+        spin_unlock_irqrestore(&shared_intremap_lock, flags);
+    }
 }
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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