From patchwork Wed May 16 04:27:20 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Herrenschmidt X-Patchwork-Id: 159517 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 44986B6FC5 for ; Wed, 16 May 2012 15:11:37 +1000 (EST) Received: from localhost ([::1]:57317 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SUVsN-0005zU-2l for incoming@patchwork.ozlabs.org; Wed, 16 May 2012 00:30:15 -0400 Received: from eggs.gnu.org ([208.118.235.92]:59666) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SUVrO-0003xq-MF for qemu-devel@nongnu.org; Wed, 16 May 2012 00:29:16 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SUVrM-0002eS-Gv for qemu-devel@nongnu.org; Wed, 16 May 2012 00:29:14 -0400 Received: from gate.crashing.org ([63.228.1.57]:34165) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SUVrM-0002eE-6p for qemu-devel@nongnu.org; Wed, 16 May 2012 00:29:12 -0400 Received: from pasglop.ozlabs.ibm.com (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.13.8) with ESMTP id q4G4SXoV007463; Tue, 15 May 2012 23:28:55 -0500 From: Benjamin Herrenschmidt To: qemu-devel@nongnu.org Date: Wed, 16 May 2012 14:27:20 +1000 Message-Id: <1337142445-26548-8-git-send-email-benh@kernel.crashing.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1337142445-26548-1-git-send-email-benh@kernel.crashing.org> References: <1337142445-26548-1-git-send-email-benh@kernel.crashing.org> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-Received-From: 63.228.1.57 Cc: David Gibson Subject: [Qemu-devel] [PATCH 07/12] usb: Convert usb_packet_{map, unmap} to universal DMA helpers X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: David Gibson The USB UHCI and EHCI drivers were converted some time ago to use the pci_dma_*() helper functions. However, this conversion was not complete because in some places both these drivers do DMA via the usb_packet_map() function in usb-libhw.c. That function directly used cpu_physical_memory_map(). Now that the sglist code uses DMA wrappers properly, we can convert the functions in usb-libhw.c, thus conpleting the conversion of UHCI and EHCI to use the DMA wrappers. Note that usb_packet_map() invokes dma_memory_map() with a NULL invalidate callback function. When IOMMU support is added, this will mean that usb_packet_map() and the corresponding usb_packet_unmap() must be called in close proximity without dropping the qemu device lock - otherwise the guest might invalidate IOMMU mappings while they are still in use by the device code. Signed-off-by: David Gibson Signed-off-by: Benjamin Herrenschmidt --- hw/usb.h | 2 +- hw/usb/hcd-ehci.c | 4 ++-- hw/usb/hcd-uhci.c | 2 +- hw/usb/libhw.c | 21 +++++++++++---------- 4 files changed, 15 insertions(+), 14 deletions(-) diff --git a/hw/usb.h b/hw/usb.h index ae7ccda..db2512c 100644 --- a/hw/usb.h +++ b/hw/usb.h @@ -345,7 +345,7 @@ void usb_packet_check_state(USBPacket *p, USBPacketState expected); void usb_packet_setup(USBPacket *p, int pid, USBEndpoint *ep); void usb_packet_addbuf(USBPacket *p, void *ptr, size_t len); int usb_packet_map(USBPacket *p, QEMUSGList *sgl); -void usb_packet_unmap(USBPacket *p); +void usb_packet_unmap(USBPacket *p, QEMUSGList *sgl); void usb_packet_copy(USBPacket *p, void *ptr, size_t bytes); void usb_packet_skip(USBPacket *p, size_t bytes); void usb_packet_cleanup(USBPacket *p); diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c index e759c99..4041899 100644 --- a/hw/usb/hcd-ehci.c +++ b/hw/usb/hcd-ehci.c @@ -1335,7 +1335,7 @@ static void ehci_execute_complete(EHCIQueue *q) set_field(&q->qh.token, q->tbytes, QTD_TOKEN_TBYTES); } ehci_finish_transfer(q, q->usb_status); - usb_packet_unmap(&q->packet); + usb_packet_unmap(&q->packet, &q->sgl); q->qh.token ^= QTD_TOKEN_DTOGGLE; q->qh.token &= ~QTD_TOKEN_ACTIVE; @@ -1456,7 +1456,7 @@ static int ehci_process_itd(EHCIState *ehci, usb_packet_map(&ehci->ipacket, &ehci->isgl); ret = usb_handle_packet(dev, &ehci->ipacket); assert(ret != USB_RET_ASYNC); - usb_packet_unmap(&ehci->ipacket); + usb_packet_unmap(&ehci->ipacket, &ehci->isgl); } else { DPRINTF("ISOCH: attempt to addess non-iso endpoint\n"); ret = USB_RET_NAK; diff --git a/hw/usb/hcd-uhci.c b/hw/usb/hcd-uhci.c index 9e211a0..726bdf3 100644 --- a/hw/usb/hcd-uhci.c +++ b/hw/usb/hcd-uhci.c @@ -874,7 +874,7 @@ static int uhci_handle_td(UHCIState *s, uint32_t addr, UHCI_TD *td, done: len = uhci_complete_td(s, td, async, int_mask); - usb_packet_unmap(&async->packet); + usb_packet_unmap(&async->packet, &async->sgl); uhci_async_free(async); return len; } diff --git a/hw/usb/libhw.c b/hw/usb/libhw.c index 2462351..c0de30e 100644 --- a/hw/usb/libhw.c +++ b/hw/usb/libhw.c @@ -26,15 +26,15 @@ int usb_packet_map(USBPacket *p, QEMUSGList *sgl) { - int is_write = (p->pid == USB_TOKEN_IN); - target_phys_addr_t len; + DMADirection dir = (p->pid == USB_TOKEN_IN) ? + DMA_DIRECTION_FROM_DEVICE : DMA_DIRECTION_TO_DEVICE; + dma_addr_t len; void *mem; int i; for (i = 0; i < sgl->nsg; i++) { len = sgl->sg[i].len; - mem = cpu_physical_memory_map(sgl->sg[i].base, &len, - is_write); + mem = dma_memory_map(sgl->dma, sgl->sg[i].base, &len, dir); if (!mem) { goto err; } @@ -46,18 +46,19 @@ int usb_packet_map(USBPacket *p, QEMUSGList *sgl) return 0; err: - usb_packet_unmap(p); + usb_packet_unmap(p, sgl); return -1; } -void usb_packet_unmap(USBPacket *p) +void usb_packet_unmap(USBPacket *p, QEMUSGList *sgl) { - int is_write = (p->pid == USB_TOKEN_IN); + DMADirection dir = (p->pid == USB_TOKEN_IN) ? + DMA_DIRECTION_FROM_DEVICE : DMA_DIRECTION_TO_DEVICE; int i; for (i = 0; i < p->iov.niov; i++) { - cpu_physical_memory_unmap(p->iov.iov[i].iov_base, - p->iov.iov[i].iov_len, is_write, - p->iov.iov[i].iov_len); + dma_memory_unmap(sgl->dma, p->iov.iov[i].iov_base, + p->iov.iov[i].iov_len, dir, + p->iov.iov[i].iov_len); } }