Commit 0f834de3 authored by Tejun Heo's avatar Tejun Heo Committed by Jeff Garzik
Browse files

libata: convert legacy PCI host handling to new init model 



Convert legacy PCI host handling to alloc-init-register model.
ata_init_legacy_host(), ata_request_legacy_irqs() and
ata_pci_init_bmdma() are separated out and follow the new init model.

The two legacy handling functions use separate ata_legacy_devres
instead of generic devm_* resources.  This reduces devres overhead for
legacy hosts which was a bit high because it didn't use PCI/iomap
merged resoruces.

ata_pci_init_one() is rewritten in terms of the aboved functions but
native mode handling is still using the old method.  Conversion will
be completed when native mode handling is updated.

Signed-off-by: default avatarTejun Heo <htejun@gmail.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent f5cda257

drivers/ata/libata-sff.c

+302 −102
Original line number Diff line number Diff line
@@ -627,75 +627,266 @@ ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int 
	return probe_ent;

}



static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev,

				struct ata_port_info **port, int port_mask)

/**

 *	ata_pci_init_bmdma - acquire PCI BMDMA resources and init ATA host

 *	@host: target ATA host

 *

 *	Acquire PCI BMDMA resources and initialize @host accordingly.

 *

 *	LOCKING:

 *	Inherited from calling layer (may sleep).

 *

 *	RETURNS:

 *	0 on success, -errno otherwise.

 */

static int ata_pci_init_bmdma(struct ata_host *host)

{

	struct ata_probe_ent *probe_ent;

	void __iomem *iomap[5] = { }, *bmdma;

	struct device *gdev = host->dev;

	struct pci_dev *pdev = to_pci_dev(gdev);

	int i, rc;



	if (port_mask & ATA_PORT_PRIMARY) {

		iomap[0] = devm_ioport_map(&pdev->dev, ATA_PRIMARY_CMD, 8);

		iomap[1] = devm_ioport_map(&pdev->dev, ATA_PRIMARY_CTL, 1);

		if (!iomap[0] || !iomap[1])

			return NULL;

	/* TODO: If we get no DMA mask we should fall back to PIO */

	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);

	if (rc)

		return rc;

	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);

	if (rc)

		return rc;



	/* request and iomap DMA region */

	rc = pcim_iomap_regions(pdev, 1 << 4, DRV_NAME);

	if (rc) {

		dev_printk(KERN_ERR, gdev, "failed to request/iomap BAR4\n");

		return -ENOMEM;

	}

	host->iomap = pcim_iomap_table(pdev);



	if (port_mask & ATA_PORT_SECONDARY) {

		iomap[2] = devm_ioport_map(&pdev->dev, ATA_SECONDARY_CMD, 8);

		iomap[3] = devm_ioport_map(&pdev->dev, ATA_SECONDARY_CTL, 1);

		if (!iomap[2] || !iomap[3])

			return NULL;

	for (i = 0; i < 2; i++) {

		struct ata_port *ap = host->ports[i];

		struct ata_ioports *ioaddr = &ap->ioaddr;

		void __iomem *bmdma = host->iomap[4] + 8 * i;



		if (ata_port_is_dummy(ap))

			continue;



		ioaddr->bmdma_addr = bmdma;

		if ((!(ap->flags & ATA_FLAG_IGN_SIMPLEX)) &&

		    (ioread8(bmdma + 2) & 0x80))

			host->flags |= ATA_HOST_SIMPLEX;

	}



	bmdma = pcim_iomap(pdev, 4, 16); /* may fail */

	return 0;

}



	/* alloc and init probe_ent */

	probe_ent = ata_probe_ent_alloc(pci_dev_to_dev(pdev), port[0]);

	if (!probe_ent)

		return NULL;

struct ata_legacy_devres {

	unsigned int	mask;

	unsigned long	cmd_port[2];

	void __iomem *	cmd_addr[2];

	void __iomem *	ctl_addr[2];

	unsigned int	irq[2];

	void *		irq_dev_id[2];

};



	probe_ent->n_ports = 2;

	probe_ent->irq_flags = IRQF_SHARED;

static void ata_legacy_free_irqs(struct ata_legacy_devres *legacy_dr)

{

	int i;



	if (port_mask & ATA_PORT_PRIMARY) {

		probe_ent->irq = ATA_PRIMARY_IRQ(pdev);

		probe_ent->port[0].cmd_addr = iomap[0];

		probe_ent->port[0].altstatus_addr =

		probe_ent->port[0].ctl_addr = iomap[1];

		if (bmdma) {

			probe_ent->port[0].bmdma_addr = bmdma;

			if ((!(port[0]->flags & ATA_FLAG_IGN_SIMPLEX)) &&

			    (ioread8(bmdma + 2) & 0x80))

				probe_ent->_host_flags |= ATA_HOST_SIMPLEX;

	for (i = 0; i < 2; i++) {

		if (!legacy_dr->irq[i])

			continue;



		free_irq(legacy_dr->irq[i], legacy_dr->irq_dev_id[i]);

		legacy_dr->irq[i] = 0;

		legacy_dr->irq_dev_id[i] = NULL;

	}

		ata_std_ports(&probe_ent->port[0]);

	} else

		probe_ent->dummy_port_mask |= ATA_PORT_PRIMARY;

}



static void ata_legacy_release(struct device *gdev, void *res)

{

	struct ata_legacy_devres *this = res;

	int i;



	ata_legacy_free_irqs(this);



	for (i = 0; i < 2; i++) {

		if (this->cmd_addr[i])

			ioport_unmap(this->cmd_addr[i]);

		if (this->ctl_addr[i])

			ioport_unmap(this->ctl_addr[i]);

		if (this->cmd_port[i])

			release_region(this->cmd_port[i], 8);

	}

}



static int ata_init_legacy_port(struct ata_port *ap,

				struct ata_legacy_devres *legacy_dr)

{

	struct ata_host *host = ap->host;

	int port_no = ap->port_no;

	unsigned long cmd_port, ctl_port;



	if (port_no == 0) {

		cmd_port = ATA_PRIMARY_CMD;

		ctl_port = ATA_PRIMARY_CTL;

	} else {

		cmd_port = ATA_SECONDARY_CMD;

		ctl_port = ATA_SECONDARY_CTL;

	}



	/* request cmd_port */

	if (request_region(cmd_port, 8, "libata"))

		legacy_dr->cmd_port[port_no] = cmd_port;

	else {

		dev_printk(KERN_WARNING, host->dev,

			   "0x%0lX IDE port busy\n", cmd_port);

		return -EBUSY;

	}



	/* iomap cmd and ctl ports */

	legacy_dr->cmd_addr[port_no] = ioport_map(cmd_port, 8);

	legacy_dr->ctl_addr[port_no] = ioport_map(ctl_port, 1);

	if (!legacy_dr->cmd_addr[port_no] || !legacy_dr->ctl_addr[port_no])

		return -ENOMEM;



	/* init IO addresses */

	ap->ioaddr.cmd_addr = legacy_dr->cmd_addr[port_no];

	ap->ioaddr.altstatus_addr = legacy_dr->ctl_addr[port_no];

	ap->ioaddr.ctl_addr = legacy_dr->ctl_addr[port_no];

	ata_std_ports(&ap->ioaddr);



	return 0;

}



/**

 *	ata_init_legacy_host - acquire legacy ATA resources and init ATA host

 *	@host: target ATA host

 *	@legacy_mask: out parameter, mask indicating ports is in legacy mode

 *	@was_busy: out parameter, indicates whether any port was busy

 *

 *	Acquire legacy ATA resources for ports.

 *

 *	LOCKING:

 *	Inherited from calling layer (may sleep).

 *

 *	RETURNS:

 *	0 on success, -errno otherwise.

 */

static int ata_init_legacy_host(struct ata_host *host,

				unsigned int *legacy_mask, int *was_busy)

{

	struct device *gdev = host->dev;

	struct ata_legacy_devres *legacy_dr;

	int i, rc;



	if (!devres_open_group(gdev, NULL, GFP_KERNEL))

		return -ENOMEM;



	rc = -ENOMEM;

	legacy_dr = devres_alloc(ata_legacy_release, sizeof(*legacy_dr),

				 GFP_KERNEL);

	if (!legacy_dr)

		goto err_out;

	devres_add(gdev, legacy_dr);



	if (port_mask & ATA_PORT_SECONDARY) {

		if (probe_ent->irq)

			probe_ent->irq2 = ATA_SECONDARY_IRQ(pdev);

	for (i = 0; i < 2; i++) {

		*legacy_mask &= ~(1 << i);

		rc = ata_init_legacy_port(host->ports[i], legacy_dr);

		if (rc == 0)

			legacy_dr->mask |= 1 << i;

		else if (rc == -EBUSY)

			(*was_busy)++;

	}



	if (!legacy_dr->mask)

		return -EBUSY;



	for (i = 0; i < 2; i++)

		if (!(legacy_dr->mask & (1 << i)))

			host->ports[i]->ops = &ata_dummy_port_ops;



	*legacy_mask |= legacy_dr->mask;



	devres_remove_group(gdev, NULL);

	return 0;



 err_out:

	devres_release_group(gdev, NULL);

	return rc;

}



/**

 *	ata_request_legacy_irqs - request legacy ATA IRQs

 *	@host: target ATA host

 *	@handler: array of IRQ handlers

 *	@irq_flags: array of IRQ flags

 *	@dev_id: array of IRQ dev_ids

 *

 *	Request legacy IRQs for non-dummy legacy ports in @host.  All

 *	IRQ parameters are passed as array to allow ports to have

 *	separate IRQ handlers.

 *

 *	LOCKING:

 *	Inherited from calling layer (may sleep).

 *

 *	RETURNS:

 *	0 on success, -errno otherwise.

 */

static int ata_request_legacy_irqs(struct ata_host *host,

				   irq_handler_t const *handler,

				   const unsigned int *irq_flags,

				   void * const *dev_id)

{

	struct device *gdev = host->dev;

	struct ata_legacy_devres *legacy_dr;

	int i, rc;



	legacy_dr = devres_find(host->dev, ata_legacy_release, NULL, NULL);

	BUG_ON(!legacy_dr);



	for (i = 0; i < 2; i++) {

		unsigned int irq;



		/* FIXME: ATA_*_IRQ() should take generic device not pci_dev */

		if (i == 0)

			irq = ATA_PRIMARY_IRQ(to_pci_dev(gdev));

		else

			probe_ent->irq = ATA_SECONDARY_IRQ(pdev);

		probe_ent->port[1].cmd_addr = iomap[2];

		probe_ent->port[1].altstatus_addr =

		probe_ent->port[1].ctl_addr = iomap[3];

		if (bmdma) {

			probe_ent->port[1].bmdma_addr = bmdma + 8;

			if ((!(port[1]->flags & ATA_FLAG_IGN_SIMPLEX)) &&

			    (ioread8(bmdma + 10) & 0x80))

				probe_ent->_host_flags |= ATA_HOST_SIMPLEX;

			irq = ATA_SECONDARY_IRQ(to_pci_dev(gdev));



		if (!(legacy_dr->mask & (1 << i)))

			continue;



		if (!handler[i]) {

			dev_printk(KERN_ERR, gdev,

				   "NULL handler specified for port %d\n", i);

			rc = -EINVAL;

			goto err_out;

		}

		ata_std_ports(&probe_ent->port[1]);



		/* FIXME: could be pointing to stack area; must copy */

		probe_ent->pinfo2 = port[1];

	} else

		probe_ent->dummy_port_mask |= ATA_PORT_SECONDARY;

		rc = request_irq(irq, handler[i], irq_flags[i], DRV_NAME,

				 dev_id[i]);

		if (rc) {

			dev_printk(KERN_ERR, gdev,

				"irq %u request failed (errno=%d)\n", irq, rc);

			goto err_out;

		}



	return probe_ent;

		/* record irq allocation in legacy_dr */

		legacy_dr->irq[i] = irq;

		legacy_dr->irq_dev_id[i] = dev_id[i];



		/* only used to print info */

		if (i == 0)

			host->irq = irq;

		else

			host->irq2 = irq;

	}



	return 0;



 err_out:

	ata_legacy_free_irqs(legacy_dr);

	return rc;

}



/**

 *	ata_pci_init_one - Initialize/register PCI IDE host controller
@@ -727,7 +918,8 @@ int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info, 
{

	struct device *dev = &pdev->dev;

	struct ata_probe_ent *probe_ent = NULL;

	struct ata_port_info *port[2];

	struct ata_host *host = NULL;

	const struct ata_port_info *port[2];

	u8 mask;

	unsigned int legacy_mode = 0;

	int rc;
@@ -783,66 +975,74 @@ int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info, 
			pcim_pin_device(pdev);

			goto err_out;

		}



		/* TODO: If we get no DMA mask we should fall back to PIO */

		rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);

		if (rc)

			goto err_out;

		rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);

		if (rc)

			goto err_out;



		pci_set_master(pdev);

	} else {

		/* Deal with combined mode hack. This side of the logic all

		   goes away once the combined mode hack is killed in 2.6.21 */

		if (!devm_request_region(dev, ATA_PRIMARY_CMD, 8, "libata")) {

			pcim_pin_device(pdev);

			printk(KERN_WARNING "ata: 0x%0X IDE port busy\n",

					    ATA_PRIMARY_CMD);

		} else

			legacy_mode |= ATA_PORT_PRIMARY;

		int was_busy = 0;



		rc = -ENOMEM;

		host = ata_host_alloc_pinfo(dev, port, 2);

		if (!host)

			goto err_out;



		if (!devm_request_region(dev, ATA_SECONDARY_CMD, 8, "libata")) {

		rc = ata_init_legacy_host(host, &legacy_mode, &was_busy);

		if (was_busy)

			pcim_pin_device(pdev);

			printk(KERN_WARNING "ata: 0x%X IDE port busy\n",

					    ATA_SECONDARY_CMD);

		} else

			legacy_mode |= ATA_PORT_SECONDARY;

		if (rc)

			goto err_out;



		if (legacy_mode & ATA_PORT_PRIMARY)

			pci_request_region(pdev, 1, DRV_NAME);

		if (legacy_mode & ATA_PORT_SECONDARY)

			pci_request_region(pdev, 3, DRV_NAME);

		/* If there is a DMA resource, allocate it */

		pci_request_region(pdev, 4, DRV_NAME);

	}

		/* request respective PCI regions, may fail */

		rc = pci_request_region(pdev, 1, DRV_NAME);

		rc = pci_request_region(pdev, 3, DRV_NAME);



	/* we have legacy mode, but all ports are unavailable */

	if (legacy_mode == (1 << 3)) {

		rc = -EBUSY;

		goto err_out;

		/* init bmdma */

		ata_pci_init_bmdma(host);

		pci_set_master(pdev);

	}



	/* TODO: If we get no DMA mask we should fall back to PIO */

	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);

	if (legacy_mode) {

		irq_handler_t handler[2] = { host->ops->irq_handler,

					     host->ops->irq_handler };

		unsigned int irq_flags[2] = { IRQF_SHARED, IRQF_SHARED };

		void *dev_id[2] = { host, host };



		rc = ata_host_start(host);

		if (rc)

			goto err_out;

	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);



		rc = ata_request_legacy_irqs(host, handler, irq_flags, dev_id);

		if (rc)

			goto err_out;



	if (legacy_mode) {

		probe_ent = ata_pci_init_legacy_port(pdev, port, legacy_mode);

		rc = ata_host_register(host, port_info[0]->sht);

		if (rc)

			goto err_out;

	} else {

		if (n_ports == 2)

			probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);

			probe_ent = ata_pci_init_native_mode(pdev, (struct ata_port_info **)port, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);

		else

			probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY);

	}

			probe_ent = ata_pci_init_native_mode(pdev, (struct ata_port_info **)port, ATA_PORT_PRIMARY);



		if (!probe_ent) {

			rc = -ENOMEM;

			goto err_out;

		}



	pci_set_master(pdev);



		if (!ata_device_add(probe_ent)) {

			rc = -ENODEV;

			goto err_out;

		}



		devm_kfree(dev, probe_ent);

	}

	devres_remove_group(dev, NULL);

	return 0;

CRA Git | Maintained and supported by SUSTech CRA and CCSE