From f1006257893917dfb1e0d74cb47b18c0e2908693 Mon Sep 17 00:00:00 2001 From: Chris Metcalf Date: Sat, 16 Jun 2012 16:41:05 -0400 Subject: [PATCH] bounce: allow use of bounce pool via config option The tilegx USB OHCI support needs the bounce pool since we're not using the IOMMU to handle 32-bit addresses. Signed-off-by: Chris Metcalf --- arch/tile/Kconfig | 6 ++++++ mm/bounce.c | 8 +++++--- 2 files changed, 11 insertions(+), 3 deletions(-) diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig index cf4bb69ea8e..932e4430f7f 100644 --- a/arch/tile/Kconfig +++ b/arch/tile/Kconfig @@ -406,6 +406,12 @@ config TILE_USB Provides USB host adapter support for the built-in EHCI and OHCI interfaces on TILE-Gx chips. +# USB OHCI needs the bounce pool since tilegx will often have more +# than 4GB of memory, but we don't currently use the IOTLB to present +# a 32-bit address to OHCI. So we need to use a bounce pool instead. +config NEED_BOUNCE_POOL + def_bool USB_OHCI_HCD + config HOTPLUG bool "Support for hot-pluggable devices" ---help--- diff --git a/mm/bounce.c b/mm/bounce.c index d1be02ca188..04208677556 100644 --- a/mm/bounce.c +++ b/mm/bounce.c @@ -24,23 +24,25 @@ static mempool_t *page_pool, *isa_page_pool; -#ifdef CONFIG_HIGHMEM +#if defined(CONFIG_HIGHMEM) || defined(CONFIG_NEED_BOUNCE_POOL) static __init int init_emergency_pool(void) { -#ifndef CONFIG_MEMORY_HOTPLUG +#if defined(CONFIG_HIGHMEM) && !defined(CONFIG_MEMORY_HOTPLUG) if (max_pfn <= max_low_pfn) return 0; #endif page_pool = mempool_create_page_pool(POOL_SIZE, 0); BUG_ON(!page_pool); - printk("highmem bounce pool size: %d pages\n", POOL_SIZE); + printk("bounce pool size: %d pages\n", POOL_SIZE); return 0; } __initcall(init_emergency_pool); +#endif +#ifdef CONFIG_HIGHMEM /* * highmem version, map in to vec */