Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762317AbYFZTkc (ORCPT ); Thu, 26 Jun 2008 15:40:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753153AbYFZT3Y (ORCPT ); Thu, 26 Jun 2008 15:29:24 -0400 Received: from outbound-dub.frontbridge.com ([213.199.154.16]:14310 "EHLO IE1EHSOBE005.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760639AbYFZT3P (ORCPT ); Thu, 26 Jun 2008 15:29:15 -0400 X-BigFish: VPS4(zzzz10d3izzz32i43j64h) X-Spam-TCS-SCL: 3:0 X-WSS-ID: 0K334RT-04-UOB-01 From: Joerg Roedel To: tglx@linutronix.de, mingo@redhat.com CC: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, bhavna.sarathy@amd.com, Sebastian.Biemueller@amd.com, robert.richter@amd.com, joro@8bytes.org, Joerg Roedel Subject: [PATCH 09/34] AMD IOMMU: add command buffer (de-)allocation Date: Thu, 26 Jun 2008 21:27:45 +0200 Message-ID: <1214508490-29683-10-git-send-email-joerg.roedel@amd.com> X-Mailer: git-send-email 1.5.3.7 In-Reply-To: <1214508490-29683-1-git-send-email-joerg.roedel@amd.com> References: <1214508490-29683-1-git-send-email-joerg.roedel@amd.com> X-OriginalArrivalTime: 26 Jun 2008 19:28:11.0590 (UTC) FILETIME=[C56C5E60:01C8D7C2] MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1541 Lines: 55 This patch adds the functions to allocate and deallocate the command buffer for one IOMMU in the system. Signed-off-by: Joerg Roedel --- arch/x86/kernel/amd_iommu_init.c | 30 ++++++++++++++++++++++++++++++ 1 files changed, 30 insertions(+), 0 deletions(-) diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c index ffb8ac8..c2be3ad 100644 --- a/arch/x86/kernel/amd_iommu_init.c +++ b/arch/x86/kernel/amd_iommu_init.c @@ -278,3 +278,33 @@ static int __init find_last_devid_acpi(struct acpi_table_header *table) return 0; } +static u8 * __init alloc_command_buffer(struct amd_iommu *iommu) +{ + u8 *cmd_buf = (u8 *)__get_free_pages(GFP_KERNEL, + get_order(CMD_BUFFER_SIZE)); + u64 entry = 0; + + if (cmd_buf == NULL) + return NULL; + + iommu->cmd_buf_size = CMD_BUFFER_SIZE; + + memset(cmd_buf, 0, CMD_BUFFER_SIZE); + + entry = (u64)virt_to_phys(cmd_buf); + entry |= MMIO_CMD_SIZE_512; + memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET, + &entry, sizeof(entry)); + + iommu_feature_enable(iommu, CONTROL_CMDBUF_EN); + + return cmd_buf; +} + +static void __init free_command_buffer(struct amd_iommu *iommu) +{ + if (iommu->cmd_buf) + free_pages((unsigned long)iommu->cmd_buf, + get_order(CMD_BUFFER_SIZE)); +} + -- 1.5.3.7 -- 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/