diff options
| author | Chris Metcalf | 2012-06-16 22:41:05 +0200 |
|---|---|---|
| committer | Chris Metcalf | 2012-07-18 22:40:35 +0200 |
| commit | f1006257893917dfb1e0d74cb47b18c0e2908693 (patch) | |
| tree | 142954273810f9186757e784c468c25f515c5456 | |
| parent | usb: add host support for the tilegx architecture (diff) | |
| download | kernel-qcow2-linux-f1006257893917dfb1e0d74cb47b18c0e2908693.tar.gz kernel-qcow2-linux-f1006257893917dfb1e0d74cb47b18c0e2908693.tar.xz kernel-qcow2-linux-f1006257893917dfb1e0d74cb47b18c0e2908693.zip | |
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 <cmetcalf@tilera.com>
| -rw-r--r-- | arch/tile/Kconfig | 6 | ||||
| -rw-r--r-- | mm/bounce.c | 8 |
2 files changed, 11 insertions, 3 deletions
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig index cf4bb69ea8e5..932e4430f7f3 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 d1be02ca1889..042086775561 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 */ |