Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755913AbYLPUTi (ORCPT ); Tue, 16 Dec 2008 15:19:38 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754557AbYLPUSq (ORCPT ); Tue, 16 Dec 2008 15:18:46 -0500 Received: from gw.goop.org ([64.81.55.164]:45893 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753095AbYLPUSp (ORCPT ); Tue, 16 Dec 2008 15:18:45 -0500 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [PATCH 02 of 14] swiotlb: allow architectures to override swiotlb pool allocation X-Mercurial-Node: 2807da57d86c95c414a4ae730ff499d82278d30b Message-Id: <2807da57d86c95c414a4.1229458646@abulafia.goop.org> In-Reply-To: Date: Tue, 16 Dec 2008 12:17:26 -0800 From: Jeremy Fitzhardinge To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Xen-devel , the arch/x86 maintainers , Ian Campbell , Jan Beulich , FUJITA Tomonori Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2713 Lines: 82 Architectures may need to allocate memory specially for use with the swiotlb. Create the weak function swiotlb_alloc_boot() and swiotlb_alloc() defaulting to the current behaviour. Signed-off-by: Jeremy Fitzhardinge Signed-off-by: Ian Campbell Cc: Joerg Roedel Cc: Jan Beulich Cc: Tony Luck Cc: FUJITA Tomonori --- include/linux/swiotlb.h | 3 +++ lib/swiotlb.c | 16 +++++++++++++--- 2 files changed, 16 insertions(+), 3 deletions(-) diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -10,6 +10,9 @@ extern void swiotlb_init(void); +extern void *swiotlb_alloc_boot(size_t bytes, unsigned long nslabs); +extern void *swiotlb_alloc(unsigned order, unsigned long nslabs); + extern void *swiotlb_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, gfp_t flags); diff --git a/lib/swiotlb.c b/lib/swiotlb.c --- a/lib/swiotlb.c +++ b/lib/swiotlb.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include #include @@ -126,6 +127,16 @@ __setup("swiotlb=", setup_io_tlb_npages); /* make io_tlb_overflow tunable too? */ +void * __weak swiotlb_alloc_boot(size_t size, unsigned long nslabs) +{ + return alloc_bootmem_low_pages(size); +} + +void * __weak swiotlb_alloc(unsigned order, unsigned long nslabs) +{ + return (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN, order); +} + /* * Statically reserve bounce buffer space and initialize bounce buffer data * structures for the software IO TLB used to implement the DMA API. @@ -145,7 +156,7 @@ /* * Get IO TLB memory from the low pages */ - io_tlb_start = alloc_bootmem_low_pages(bytes); + io_tlb_start = swiotlb_alloc_boot(bytes, io_tlb_nslabs); if (!io_tlb_start) panic("Cannot allocate SWIOTLB buffer"); io_tlb_end = io_tlb_start + bytes; @@ -202,8 +213,7 @@ bytes = io_tlb_nslabs << IO_TLB_SHIFT; while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) { - io_tlb_start = (char *)__get_free_pages(GFP_DMA | __GFP_NOWARN, - order); + io_tlb_start = swiotlb_alloc(order, io_tlb_nslabs); if (io_tlb_start) break; order--; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/