From patchwork Fri Apr 1 14:32:10 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Denis V. Lunev" X-Patchwork-Id: 8725271 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 3E3029FC82 for ; Fri, 1 Apr 2016 14:32:42 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 5C49A2009C for ; Fri, 1 Apr 2016 14:32:41 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4E29B200FF for ; Fri, 1 Apr 2016 14:32:40 +0000 (UTC) Received: from localhost ([::1]:44744 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1am07r-0006pl-MW for patchwork-qemu-devel@patchwork.kernel.org; Fri, 01 Apr 2016 10:32:39 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47153) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1am07f-0006oK-Be for qemu-devel@nongnu.org; Fri, 01 Apr 2016 10:32:28 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1am07d-0002GM-B7 for qemu-devel@nongnu.org; Fri, 01 Apr 2016 10:32:27 -0400 Received: from mailhub.sw.ru ([195.214.232.25]:33067 helo=relay.sw.ru) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1am07c-0002Fe-Py for qemu-devel@nongnu.org; Fri, 01 Apr 2016 10:32:25 -0400 Received: from irbis.sw.ru ([10.30.2.139]) by relay.sw.ru (8.13.4/8.13.4) with ESMTP id u31EWAWh009799; Fri, 1 Apr 2016 17:32:16 +0300 (MSK) From: "Denis V. Lunev" To: qemu-devel@nongnu.org Date: Fri, 1 Apr 2016 17:32:10 +0300 Message-Id: <1459521130-3792-4-git-send-email-den@openvz.org> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1459521130-3792-1-git-send-email-den@openvz.org> References: <1459521130-3792-1-git-send-email-den@openvz.org> X-detected-operating-system: by eggs.gnu.org: OpenBSD 3.x X-Received-From: 195.214.232.25 Cc: "Denis V. Lunev" , jsnow@redhat.com, rkagan@virtuozzo.com, Pavel Butsykin Subject: [Qemu-devel] [PATCH 3/3] ide: really restart pending and in-flight atapi dma 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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Pavel Butsykin Restart of ATAPI DMA used to be unreachable, because the request to do so wasn't indicated in bus->error_status due to the lack of spare bits, and ide_restart_bh() would return early doing nothing. This patch makes use of the observation that not all bit combinations were possible in ->error_status. In particular, IDE_RETRY_READ only made sense together with IDE_RETRY_DMA or IDE_RETRY_PIO. This allows to re-use IDE_RETRY_READ alone as an indicator of ATAPI DMA restart request. To makes things more uniform, ATAPI DMA gets its own value for ->dma_cmd. As a means against confusion, macros are added to test the state of ->error_status. The patch fixes the restart of both in-flight and pending ATAPI DMA, following the scheme similar to that of IDE DMA. Signed-off-by: Pavel Butsykin Reviewed-by: Roman Kagan Signed-off-by: Denis V. Lunev --- hw/ide/atapi.c | 15 ++++++++------- hw/ide/core.c | 27 ++++++++++++--------------- hw/ide/internal.h | 21 +++++++++++++++++++++ hw/ide/macio.c | 2 ++ 4 files changed, 43 insertions(+), 22 deletions(-) diff --git a/hw/ide/atapi.c b/hw/ide/atapi.c index acc52cd..fb9ae43 100644 --- a/hw/ide/atapi.c +++ b/hw/ide/atapi.c @@ -342,6 +342,7 @@ static void ide_atapi_cmd_reply(IDEState *s, int size, int max_size) block_acct_start(blk_get_stats(s->blk), &s->acct, size, BLOCK_ACCT_READ); s->status = READY_STAT | SEEK_STAT | DRQ_STAT; + s->dma_cmd = IDE_DMA_ATAPI; ide_start_dma(s, ide_atapi_cmd_read_dma_cb); } else { s->status = READY_STAT | SEEK_STAT; @@ -375,15 +376,18 @@ static void ide_atapi_cmd_check_status(IDEState *s) } /* ATAPI DMA support */ -/* XXX: handle read errors */ static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret) { IDEState *s = opaque; int data_offset, n; if (ret < 0) { - ide_atapi_io_error(s, ret); - goto eot; + if (ide_handle_rw_error(s, -ret, ide_dma_cmd_to_retry(s->dma_cmd))) { + if (s->bus->error_status) { + return; + } + goto eot; + } } if (s->io_buffer_size > 0) { @@ -464,6 +468,7 @@ static void ide_atapi_cmd_read_dma(IDEState *s, int lba, int nb_sectors, /* XXX: check if BUSY_STAT should be set */ s->status = READY_STAT | SEEK_STAT | DRQ_STAT | BUSY_STAT; + s->dma_cmd = IDE_DMA_ATAPI; ide_start_dma(s, ide_atapi_cmd_read_dma_cb); } @@ -481,10 +486,6 @@ static void ide_atapi_cmd_read(IDEState *s, int lba, int nb_sectors, } } - -/* Called by *_restart_bh when the transfer function points - * to ide_atapi_cmd - */ void ide_atapi_dma_restart(IDEState *s) { /* diff --git a/hw/ide/core.c b/hw/ide/core.c index 8f86036..0425d86 100644 --- a/hw/ide/core.c +++ b/hw/ide/core.c @@ -56,7 +56,6 @@ static const int smart_attributes[][12] = { { 190, 0x03, 0x00, 0x45, 0x45, 0x1f, 0x00, 0x1f, 0x1f, 0x00, 0x00, 0x32}, }; -static int ide_handle_rw_error(IDEState *s, int error, int op); static void ide_dummy_transfer_stop(IDEState *s); static void padstr(char *str, const char *src, int len) @@ -772,7 +771,7 @@ void ide_dma_error(IDEState *s) ide_set_irq(s->bus); } -static int ide_handle_rw_error(IDEState *s, int error, int op) +int ide_handle_rw_error(IDEState *s, int error, int op) { bool is_read = (op & IDE_RETRY_READ) != 0; BlockErrorAction action = blk_get_error_action(s->blk, is_read, error); @@ -782,8 +781,10 @@ static int ide_handle_rw_error(IDEState *s, int error, int op) s->bus->error_status = op; } else if (action == BLOCK_ERROR_ACTION_REPORT) { block_acct_failed(blk_get_stats(s->blk), &s->acct); - if (op & IDE_RETRY_DMA) { + if (IS_IDE_RETRY_DMA(op)) { ide_dma_error(s); + } else if (IS_IDE_RETRY_ATAPI(op)) { + ide_atapi_io_error(s, -error); } else { ide_rw_error(s); } @@ -871,6 +872,8 @@ static void ide_dma_cb(void *opaque, int ret) ide_issue_trim, ide_dma_cb, s, DMA_DIRECTION_TO_DEVICE); break; + default: + abort(); } return; @@ -2517,15 +2520,13 @@ static void ide_restart_bh(void *opaque) if (s->bus->dma->ops->restart) { s->bus->dma->ops->restart(s->bus->dma); } - } - - if (error_status & IDE_RETRY_DMA) { + } else if (IS_IDE_RETRY_DMA(error_status)) { if (error_status & IDE_RETRY_TRIM) { ide_restart_dma(s, IDE_DMA_TRIM); } else { ide_restart_dma(s, is_read ? IDE_DMA_READ : IDE_DMA_WRITE); } - } else if (error_status & IDE_RETRY_PIO) { + } else if (IS_IDE_RETRY_PIO(error_status)) { if (is_read) { ide_sector_read(s); } else { @@ -2533,15 +2534,11 @@ static void ide_restart_bh(void *opaque) } } else if (error_status & IDE_RETRY_FLUSH) { ide_flush_cache(s); + } else if (IS_IDE_RETRY_ATAPI(error_status)) { + assert(s->end_transfer_func == ide_atapi_cmd); + ide_atapi_dma_restart(s); } else { - /* - * We've not got any bits to tell us about ATAPI - but - * we do have the end_transfer_func that tells us what - * we're trying to do. - */ - if (s->end_transfer_func == ide_atapi_cmd) { - ide_atapi_dma_restart(s); - } + abort(); } } diff --git a/hw/ide/internal.h b/hw/ide/internal.h index 68c7d0d..eb006c2 100644 --- a/hw/ide/internal.h +++ b/hw/ide/internal.h @@ -338,6 +338,7 @@ enum ide_dma_cmd { IDE_DMA_READ, IDE_DMA_WRITE, IDE_DMA_TRIM, + IDE_DMA_ATAPI }; #define ide_cmd_is_read(s) \ @@ -508,11 +509,27 @@ struct IDEDevice { /* These are used for the error_status field of IDEBus */ #define IDE_RETRY_DMA 0x08 #define IDE_RETRY_PIO 0x10 +#define IDE_RETRY_ATAPI 0x20 /* reused IDE_RETRY_READ bit */ #define IDE_RETRY_READ 0x20 #define IDE_RETRY_FLUSH 0x40 #define IDE_RETRY_TRIM 0x80 #define IDE_RETRY_HBA 0x100 +#define IS_IDE_RETRY_DMA(_status) \ + ((_status) & IDE_RETRY_DMA) + +#define IS_IDE_RETRY_PIO(_status) \ + ((_status) & IDE_RETRY_PIO) + +/* + * The method of the IDE_RETRY_ATAPI determination is to use a previously + * impossible bit combination as a new status value. + */ +#define IS_IDE_RETRY_ATAPI(_status) \ + (((_status) & IDE_RETRY_ATAPI) && \ + !IS_IDE_RETRY_DMA(_status) && \ + !IS_IDE_RETRY_PIO(_status)) + static inline uint8_t ide_dma_cmd_to_retry(uint8_t dma_cmd) { switch (dma_cmd) { @@ -522,6 +539,8 @@ static inline uint8_t ide_dma_cmd_to_retry(uint8_t dma_cmd) return IDE_RETRY_DMA; case IDE_DMA_TRIM: return IDE_RETRY_DMA | IDE_RETRY_TRIM; + case IDE_DMA_ATAPI: + return IDE_RETRY_ATAPI; default: break; } @@ -612,4 +631,6 @@ void ide_bus_new(IDEBus *idebus, size_t idebus_size, DeviceState *dev, int bus_id, int max_units); IDEDevice *ide_create_drive(IDEBus *bus, int unit, DriveInfo *drive); +int ide_handle_rw_error(IDEState *s, int error, int op); + #endif /* HW_IDE_INTERNAL_H */ diff --git a/hw/ide/macio.c b/hw/ide/macio.c index 1725e5b..76256eb 100644 --- a/hw/ide/macio.c +++ b/hw/ide/macio.c @@ -346,6 +346,8 @@ static void pmac_ide_transfer_cb(void *opaque, int ret) case IDE_DMA_TRIM: pmac_dma_trim(s->blk, offset, io->len, pmac_ide_transfer_cb, io); break; + default: + abort(); } return;