dma-debug is now capable of adding new entries to its pool on-demand if
the initial preallocation was insufficient, so the IOMMU_LEAK logic no
longer needs to explicitly change the pool size. This does lose it the
ability to save a couple of megabytes of RAM by reducing the pool size
below its default, but it seems unlikely that that is a realistic
concern these days (or indeed that anyone is actively debugging AGP
drivers' DMA usage any more). Getting rid of dma_debug_resize_entries()
will make room for further streamlining in the dma-debug code itself.
Removing the call reveals quite a lot of cruft which has been useless
for nearly a decade since commit 19c1a6f5764d ("x86 gart: reimplement
IOMMU_LEAK feature by using DMA_API_DEBUG"), including the entire
'iommu=leak' parameter, which controlled nothing except whether
dma_debug_resize_entries() was called or not.
CC: Thomas Gleixner
CC: Ingo Molnar
CC: Borislav Petkov
CC: "H. Peter Anvin"
CC: x...@kernel.org
Signed-off-by: Robin Murphy
---
v2: New
Documentation/x86/x86_64/boot-options.txt | 5 +
arch/x86/kernel/amd_gart_64.c | 23 ---
2 files changed, 1 insertion(+), 27 deletions(-)
diff --git a/Documentation/x86/x86_64/boot-options.txt
b/Documentation/x86/x86_64/boot-options.txt
index ad6d2a80cf05..abc53886655e 100644
--- a/Documentation/x86/x86_64/boot-options.txt
+++ b/Documentation/x86/x86_64/boot-options.txt
@@ -209,7 +209,7 @@ IOMMU (input/output memory management unit)
mapping with memory protection, etc.
Kernel boot message: "PCI-DMA: Using Calgary IOMMU"
- iommu=[][,noagp][,off][,force][,noforce][,leak[=]
+ iommu=[][,noagp][,off][,force][,noforce]
[,memaper[=]][,merge][,fullflush][,nomerge]
[,noaperture][,calgary]
@@ -228,9 +228,6 @@ IOMMU (input/output memory management unit)
allowedOverwrite iommu off workarounds for specific chipsets.
fullflush Flush IOMMU on each allocation (default).
nofullflushDon't use IOMMU fullflush.
-leak Turn on simple iommu leak tracing (only when
- CONFIG_IOMMU_LEAK is on). Default number of leak pages
- is 20.
memaper[=] Allocate an own aperture over RAM with size 32MB
