From patchwork Mon Nov 30 13:22:54 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alan Cox X-Patchwork-Id: 39799 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by ozlabs.org (Postfix) with ESMTP id E55441007D3 for ; Tue, 1 Dec 2009 00:42:35 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752743AbZK3Nm2 (ORCPT ); Mon, 30 Nov 2009 08:42:28 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752754AbZK3Nm2 (ORCPT ); Mon, 30 Nov 2009 08:42:28 -0500 Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:50837 "EHLO bob.linux.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752743AbZK3Nm1 (ORCPT ); Mon, 30 Nov 2009 08:42:27 -0500 Received: from localhost.localdomain (localhost [127.0.0.1]) by bob.linux.org.uk (8.14.3/8.14.3) with ESMTP id nAUDMsak027316; Mon, 30 Nov 2009 13:22:54 GMT From: Alan Cox Subject: [PATCH 3/6] cmd64x: implement serialization as per notes To: linux-ide@vger.kernel.org, jeff@garzik.org, davem@davemloft.net Date: Mon, 30 Nov 2009 13:22:54 +0000 Message-ID: <20091130132254.27236.42812.stgit@localhost.localdomain> In-Reply-To: <20091130132005.27236.77890.stgit@localhost.localdomain> References: <20091130132005.27236.77890.stgit@localhost.localdomain> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Sender: linux-ide-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ide@vger.kernel.org Daniela Engert pointed out that there are some implementation notes for the 643 and 646 that deal with certain serialization rules. In theory we don't need them because they apply when the motherboard decides not to retry PCI requests for long enough and the chip is busy doing a DMA transfer on the other channel. The rule basically is "don't touch the taskfile of the other channel while a DMA is in progress". To implement that we need to - not issue a command on a channel when there is a DMA command queued - not issue a DMA command on a channel when there are PIO commands queued - use the alternative access to the interrupt source so that we do not touch altstatus or status on shared IRQ. Updated to remote extra conditional check Bartlomiej noted and to remove the variables for irq checks as the CMD648 doesn't have the underlying problem. Signed-off-by: Alan Cox --- drivers/ata/pata_cmd64x.c | 116 ++++++++++++++++++++++++++++++++++++++++++--- 1 files changed, 108 insertions(+), 8 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/ata/pata_cmd64x.c b/drivers/ata/pata_cmd64x.c index f98dffe..e4d3a1e 100644 --- a/drivers/ata/pata_cmd64x.c +++ b/drivers/ata/pata_cmd64x.c @@ -31,7 +31,7 @@ #include #define DRV_NAME "pata_cmd64x" -#define DRV_VERSION "0.2.5" +#define DRV_VERSION "0.3.1" /* * CMD64x specific registers definition. @@ -254,17 +254,109 @@ static void cmd648_bmdma_stop(struct ata_queued_cmd *qc) } /** - * cmd646r1_dma_stop - DMA stop callback + * cmd64x_bmdma_stop - DMA stop callback * @qc: Command in progress * - * Stub for now while investigating the r1 quirk in the old driver. + * Track the completion of live DMA commands and clear the + * host->private_data DMA tracking flag as we do. */ -static void cmd646r1_bmdma_stop(struct ata_queued_cmd *qc) +static void cmd64x_bmdma_stop(struct ata_queued_cmd *qc) { + struct ata_port *ap = qc->ap; ata_bmdma_stop(qc); + WARN_ON(ap->host->private_data != ap); + ap->host->private_data = NULL; +} + +/** + * cmd64x_qc_defer - Defer logic for chip limits + * @qc: queued command + * + * Decide whether we can issue the command. Called under the host lock. + */ + +static int cmd64x_qc_defer(struct ata_queued_cmd *qc) +{ + struct ata_host *host = qc->ap->host; + struct ata_port *alt = host->ports[1 ^ qc->ap->port_no]; + int rc; + int dma = 0; + + /* Apply the ATA rules first */ + rc = ata_std_qc_defer(qc); + if (rc) + return rc; + + if (qc->tf.protocol == ATAPI_PROT_DMA || + qc->tf.protocol == ATA_PROT_DMA) + dma = 1; + + /* If the other port is not live then issue the command */ + if (alt == NULL || !alt->qc_active) { + if (dma) + host->private_data = qc->ap; + return 0; + } + /* If there is a live DMA command then wait */ + if (host->private_data != NULL) + return ATA_DEFER_PORT; + if (dma) + /* Cannot overlap our DMA command */ + return ATA_DEFER_PORT; + return 0; } +/** + * cmd64x_interrupt - ATA host interrupt handler + * @irq: irq line (unused) + * @dev_instance: pointer to our ata_host information structure + * + * Our interrupt handler for PCI IDE devices. Calls + * ata_sff_host_intr() for each port that is flagging an IRQ. We cannot + * use the defaults as we need to avoid touching status/altstatus during + * a DMA. + * + * LOCKING: + * Obtains host lock during operation. + * + * RETURNS: + * IRQ_NONE or IRQ_HANDLED. + */ +irqreturn_t cmd64x_interrupt(int irq, void *dev_instance) +{ + struct ata_host *host = dev_instance; + struct pci_dev *pdev = to_pci_dev(host->dev); + unsigned int i; + unsigned int handled = 0; + unsigned long flags; + static const u8 irq_reg[2] = { CFR, ARTTIM23 }; + static const u8 irq_mask[2] = { 1 << 2, 1 << 4 }; + + /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */ + spin_lock_irqsave(&host->lock, flags); + + for (i = 0; i < host->n_ports; i++) { + struct ata_port *ap; + u8 reg; + + pci_read_config_byte(pdev, irq_reg[i], ®); + ap = host->ports[i]; + if (ap && (reg & irq_mask[i]) && + !(ap->flags & ATA_FLAG_DISABLED)) { + struct ata_queued_cmd *qc; + + qc = ata_qc_from_tag(ap, ap->link.active_tag); + if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) && + (qc->flags & ATA_QCFLAG_ACTIVE)) + handled |= ata_sff_host_intr(ap, qc); + } + } + + spin_unlock_irqrestore(&host->lock, flags); + + return IRQ_RETVAL(handled); +} static struct scsi_host_template cmd64x_sht = { ATA_BMDMA_SHT(DRV_NAME), }; @@ -273,6 +365,8 @@ static const struct ata_port_operations cmd64x_base_ops = { .inherits = &ata_bmdma_port_ops, .set_piomode = cmd64x_set_piomode, .set_dmamode = cmd64x_set_dmamode, + .bmdma_stop = cmd64x_bmdma_stop, + .qc_defer = cmd64x_qc_defer, }; static struct ata_port_operations cmd64x_port_ops = { @@ -282,7 +376,6 @@ static struct ata_port_operations cmd64x_port_ops = { static struct ata_port_operations cmd646r1_port_ops = { .inherits = &cmd64x_base_ops, - .bmdma_stop = cmd646r1_bmdma_stop, .cable_detect = ata_cable_40wire, }; @@ -290,6 +383,7 @@ static struct ata_port_operations cmd648_port_ops = { .inherits = &cmd64x_base_ops, .bmdma_stop = cmd648_bmdma_stop, .cable_detect = cmd648_cable_detect, + .qc_defer = ata_std_qc_defer }; static int cmd64x_init_one(struct pci_dev *pdev, const struct pci_device_id *id) @@ -340,6 +434,7 @@ static int cmd64x_init_one(struct pci_dev *pdev, const struct pci_device_id *id) const struct ata_port_info *ppi[] = { &cmd_info[id->driver_data], NULL }; u8 mrdmode; int rc; + struct ata_host *host; rc = pcim_enable_device(pdev); if (rc) @@ -360,20 +455,25 @@ static int cmd64x_init_one(struct pci_dev *pdev, const struct pci_device_id *id) ppi[0] = &cmd_info[3]; } + pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 64); pci_read_config_byte(pdev, MRDMODE, &mrdmode); mrdmode &= ~ 0x30; /* IRQ set up */ mrdmode |= 0x02; /* Memory read line enable */ pci_write_config_byte(pdev, MRDMODE, mrdmode); - /* Force PIO 0 here.. */ - /* PPC specific fixup copied from old driver */ #ifdef CONFIG_PPC pci_write_config_byte(pdev, UDIDETCR0, 0xF0); #endif + rc = ata_pci_sff_prepare_host(pdev, ppi, &host); + if (rc) + return rc; + /* We use this pointer to track the AP which has DMA running */ + host->private_data = NULL; - return ata_pci_sff_init_one(pdev, ppi, &cmd64x_sht, NULL); + pci_set_master(pdev); + return ata_pci_sff_activate_host(host, cmd64x_interrupt, &cmd64x_sht); } #ifdef CONFIG_PM