From patchwork Tue May 4 12:21:03 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kiszka X-Patchwork-Id: 51597 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [199.232.76.165]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 59C8FB7D19 for ; Tue, 4 May 2010 22:25:45 +1000 (EST) Received: from localhost ([127.0.0.1]:36414 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1O9HC1-0006as-FP for incoming@patchwork.ozlabs.org; Tue, 04 May 2010 08:25:41 -0400 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1O9H7q-0005Ol-B9 for qemu-devel@nongnu.org; Tue, 04 May 2010 08:21:22 -0400 Received: from [140.186.70.92] (port=50491 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1O9H7f-0005Ji-7c for qemu-devel@nongnu.org; Tue, 04 May 2010 08:21:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1O9H7b-0008VS-7y for qemu-devel@nongnu.org; Tue, 04 May 2010 08:21:11 -0400 Received: from david.siemens.de ([192.35.17.14]:23957) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1O9H7a-0008Uz-S3 for qemu-devel@nongnu.org; Tue, 04 May 2010 08:21:07 -0400 Received: from mail1.siemens.de (localhost [127.0.0.1]) by david.siemens.de (8.12.11.20060308/8.12.11) with ESMTP id o44CL5ZW011848; Tue, 4 May 2010 14:21:06 +0200 Received: from localhost.localdomain (mchn012c.mchp.siemens.de [139.25.109.167] (may be forged)) by mail1.siemens.de (8.12.11.20060308/8.12.11) with ESMTP id o44CL3f2030959; Tue, 4 May 2010 14:21:05 +0200 From: Jan Kiszka To: Anthony Liguori Date: Tue, 4 May 2010 14:21:03 +0200 Message-Id: <20a40eb31a0f8257a5866204cbfa53c8d75707af.1272975660.git.jan.kiszka@siemens.com> X-Mailer: git-send-email 1.6.0.2 In-Reply-To: References: In-Reply-To: References: X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4-2.6 Cc: qemu-devel@nongnu.org, Gerd Hoffmann Subject: [Qemu-devel] [PATCH 5/5] lsi: Handle removal of selected devices X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org We must not store references to selected devices as they may be hot-removed. Instead, look up the device based on its tag right before using it. If the device disappeared, throw an interrupt and disconnect. Signed-off-by: Jan Kiszka --- hw/lsi53c895a.c | 60 ++++++++++++++++++++++++++++++++++-------------------- 1 files changed, 38 insertions(+), 22 deletions(-) diff --git a/hw/lsi53c895a.c b/hw/lsi53c895a.c index f088d06..9d3c44d 100644 --- a/hw/lsi53c895a.c +++ b/hw/lsi53c895a.c @@ -175,7 +175,6 @@ do { fprintf(stderr, "lsi_scsi: error: " fmt , ## __VA_ARGS__);} while (0) typedef struct lsi_request { uint32_t tag; - SCSIDevice *dev; uint32_t dma_len; uint8_t *dma_buf; uint32_t pending; @@ -202,7 +201,6 @@ typedef struct { * 3 if a DMA operation is in progress. */ int waiting; SCSIBus bus; - SCSIDevice *select_dev; int current_lun; /* The tag is a combination of the device ID and the SCSI tag. */ uint32_t select_tag; @@ -518,11 +516,25 @@ static void lsi_resume_script(LSIState *s) } } +static void lsi_disconnect(LSIState *s) +{ + s->scntl1 &= ~LSI_SCNTL1_CON; + s->sstat1 &= ~PHASE_MASK; +} + +static void lsi_bad_selection(LSIState *s, uint32_t id) +{ + DPRINTF("Selected absent target %d\n", id); + lsi_script_scsi_interrupt(s, 0, LSI_SIST1_STO); + lsi_disconnect(s); +} + /* Initiate a SCSI layer data transfer. */ static void lsi_do_dma(LSIState *s, int out) { - uint32_t count; + uint32_t count, id; target_phys_addr_t addr; + SCSIDevice *dev; assert(s->current); if (!s->current->dma_len) { @@ -531,6 +543,13 @@ static void lsi_do_dma(LSIState *s, int out) return; } + id = s->current->tag >> 8; + dev = s->bus.devs[id]; + if (!dev) { + lsi_bad_selection(s, id); + return; + } + count = s->dbc; if (count > s->current->dma_len) count = s->current->dma_len; @@ -550,8 +569,7 @@ static void lsi_do_dma(LSIState *s, int out) s->dbc -= count; if (s->current->dma_buf == NULL) { - s->current->dma_buf = s->current->dev->info->get_buf(s->current->dev, - s->current->tag); + s->current->dma_buf = dev->info->get_buf(dev, s->current->tag); } /* ??? Set SFBR to first data byte. */ @@ -565,10 +583,10 @@ static void lsi_do_dma(LSIState *s, int out) s->current->dma_buf = NULL; if (out) { /* Write the data. */ - s->current->dev->info->write_data(s->current->dev, s->current->tag); + dev->info->write_data(dev, s->current->tag); } else { /* Request any remaining data. */ - s->current->dev->info->read_data(s->current->dev, s->current->tag); + dev->info->read_data(dev, s->current->tag); } } else { s->current->dma_buf += count; @@ -715,7 +733,9 @@ static void lsi_command_complete(SCSIBus *bus, int reason, uint32_t tag, static void lsi_do_command(LSIState *s) { + SCSIDevice *dev; uint8_t buf[16]; + uint32_t id; int n; DPRINTF("Send command len=%d\n", s->dbc); @@ -725,19 +745,24 @@ static void lsi_do_command(LSIState *s) s->sfbr = buf[0]; s->command_complete = 0; + id = s->select_tag >> 8; + dev = s->bus.devs[id]; + if (!dev) { + lsi_bad_selection(s, id); + return; + } + assert(s->current == NULL); s->current = qemu_mallocz(sizeof(lsi_request)); s->current->tag = s->select_tag; - s->current->dev = s->select_dev; - n = s->current->dev->info->send_command(s->current->dev, s->current->tag, buf, - s->current_lun); + n = dev->info->send_command(dev, s->current->tag, buf, s->current_lun); if (n > 0) { lsi_set_phase(s, PHASE_DI); - s->current->dev->info->read_data(s->current->dev, s->current->tag); + dev->info->read_data(dev, s->current->tag); } else if (n < 0) { lsi_set_phase(s, PHASE_DO); - s->current->dev->info->write_data(s->current->dev, s->current->tag); + dev->info->write_data(dev, s->current->tag); } if (!s->command_complete) { @@ -771,12 +796,6 @@ static void lsi_do_status(LSIState *s) lsi_add_msg_byte(s, 0); /* COMMAND COMPLETE */ } -static void lsi_disconnect(LSIState *s) -{ - s->scntl1 &= ~LSI_SCNTL1_CON; - s->sstat1 &= ~PHASE_MASK; -} - static void lsi_do_msgin(LSIState *s) { int len; @@ -1092,9 +1111,7 @@ again: s->sstat0 |= LSI_SSTAT0_WOA; s->scntl1 &= ~LSI_SCNTL1_IARB; if (id >= LSI_MAX_DEVS || !s->bus.devs[id]) { - DPRINTF("Selected absent target %d\n", id); - lsi_script_scsi_interrupt(s, 0, LSI_SIST1_STO); - lsi_disconnect(s); + lsi_bad_selection(s, id); break; } DPRINTF("Selected target %d%s\n", @@ -1102,7 +1119,6 @@ again: /* ??? Linux drivers compain when this is set. Maybe it only applies in low-level mode (unimplemented). lsi_script_scsi_interrupt(s, LSI_SIST0_CMP, 0); */ - s->select_dev = s->bus.devs[id]; s->select_tag = id << 8; s->scntl1 |= LSI_SCNTL1_CON; if (insn & (1 << 3)) {