From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: [PATCH 05/10] xen/swiotlb: Move the error strings to its own function. Date: Mon, 10 Sep 2012 15:46:02 -0400 Message-ID: <1347306367-28669-6-git-send-email-konrad.wilk@oracle.com> References: <1347306367-28669-1-git-send-email-konrad.wilk@oracle.com> Return-path: In-Reply-To: <1347306367-28669-1-git-send-email-konrad.wilk@oracle.com> Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org, xen-devel@lists.xensource.com, stefano.stabellini@eu.citrix.com Cc: Konrad Rzeszutek Wilk List-Id: xen-devel@lists.xenproject.org That way we can more easily reuse those errors when using the late SWIOTLB init. Signed-off-by: Konrad Rzeszutek Wilk --- drivers/xen/swiotlb-xen.c | 35 +++++++++++++++++++++++++++-------- 1 files changed, 27 insertions(+), 8 deletions(-) diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c index a2aad6e..701b103 100644 --- a/drivers/xen/swiotlb-xen.c +++ b/drivers/xen/swiotlb-xen.c @@ -154,11 +154,33 @@ static unsigned long xen_set_nslabs(unsigned long nr_tbl) return xen_io_tlb_nslabs << IO_TLB_SHIFT; } + +enum xen_swiotlb_err { + XEN_SWIOTLB_UNKNOWN = 0, + XEN_SWIOTLB_ENOMEM, + XEN_SWIOTLB_EFIXUP +}; + +static const char *xen_swiotlb_error(enum xen_swiotlb_err err) +{ + switch (err) { + case XEN_SWIOTLB_ENOMEM: + return "Cannot allocate Xen-SWIOTLB buffer\n"; + case XEN_SWIOTLB_EFIXUP: + return "Failed to get contiguous memory for DMA from Xen!\n"\ + "You either: don't have the permissions, do not have"\ + " enough free memory under 4GB, or the hypervisor memory"\ + " is too fragmented!"; + default: + break; + } + return ""; +} void __init xen_swiotlb_init(int verbose) { unsigned long bytes; int rc = -ENOMEM; - char *m = NULL; + enum xen_swiotlb_err m_ret = XEN_SWIOTLB_UNKNOWN; unsigned int repeat = 3; xen_io_tlb_nslabs = swiotlb_nr_tbl(); @@ -169,7 +191,7 @@ retry: */ xen_io_tlb_start = alloc_bootmem_pages(PAGE_ALIGN(bytes)); if (!xen_io_tlb_start) { - m = "Cannot allocate Xen-SWIOTLB buffer!\n"; + m_ret = XEN_SWIOTLB_ENOMEM; goto error; } xen_io_tlb_end = xen_io_tlb_start + bytes; @@ -181,10 +203,7 @@ retry: xen_io_tlb_nslabs); if (rc) { free_bootmem(__pa(xen_io_tlb_start), PAGE_ALIGN(bytes)); - m = "Failed to get contiguous memory for DMA from Xen!\n"\ - "You either: don't have the permissions, do not have"\ - " enough free memory under 4GB, or the hypervisor memory"\ - "is too fragmented!"; + m_ret = XEN_SWIOTLB_EFIXUP; goto error; } start_dma_addr = xen_virt_to_bus(xen_io_tlb_start); @@ -199,8 +218,8 @@ error: (xen_io_tlb_nslabs << IO_TLB_SHIFT) >> 20); goto retry; } - xen_raw_printk("%s (rc:%d)", m, rc); - panic("%s (rc:%d)", m, rc); + xen_raw_printk("%s (rc:%d)", xen_swiotlb_error(m_ret), rc); + panic("%s (rc:%d)", xen_swiotlb_error(m_ret), rc); } void * -- 1.7.7.6