Release 4.14 arch/ia64/sn/kernel/msi_sn.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2006 Silicon Graphics, Inc.  All Rights Reserved.
 */

#include <linux/types.h>
#include <linux/irq.h>
#include <linux/pci.h>
#include <linux/cpumask.h>
#include <linux/msi.h>
#include <linux/slab.h>

#include <asm/sn/addrs.h>
#include <asm/sn/intr.h>
#include <asm/sn/pcibus_provider_defs.h>
#include <asm/sn/pcidev.h>
#include <asm/sn/nodepda.h>


struct sn_msi_info {
	
u64 pci_addr;
	
struct sn_irq_info *sn_irq_info;
};


static struct sn_msi_info sn_msi_info[NR_IRQS];


static struct irq_chip sn_msi_chip;



void sn_teardown_msi_irq(unsigned int irq)
{
	nasid_t nasid;
	int widget;
	struct pci_dev *pdev;
	struct pcidev_info *sn_pdev;
	struct sn_irq_info *sn_irq_info;
	struct pcibus_bussoft *bussoft;
	struct sn_pcibus_provider *provider;

	sn_irq_info = sn_msi_info[irq].sn_irq_info;
	if (sn_irq_info == NULL || sn_irq_info->irq_int_bit >= 0)
		return;

	sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
	pdev = sn_pdev->pdi_linux_pcidev;
	provider = SN_PCIDEV_BUSPROVIDER(pdev);

	(*provider->dma_unmap)(pdev,
			       sn_msi_info[irq].pci_addr,
			       PCI_DMA_FROMDEVICE);
	sn_msi_info[irq].pci_addr = 0;

	bussoft = SN_PCIDEV_BUSSOFT(pdev);
	nasid = NASID_GET(bussoft->bs_base);
	widget = (nasid & 1) ?
			TIO_SWIN_WIDGETNUM(bussoft->bs_base) :
			SWIN_WIDGETNUM(bussoft->bs_base);

	sn_intr_free(nasid, widget, sn_irq_info);
	sn_msi_info[irq].sn_irq_info = NULL;

	destroy_irq(irq);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mark Maule
164
93.71%
1
25.00%
Eric W. Biedermann
11
6.29%
3
75.00%
Total
175
100.00%
4
100.00%



int sn_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *entry)
{
	struct msi_msg msg;
	int widget;
	int status;
	nasid_t nasid;
	u64 bus_addr;
	struct sn_irq_info *sn_irq_info;
	struct pcibus_bussoft *bussoft = SN_PCIDEV_BUSSOFT(pdev);
	struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
	int irq;

	if (!entry->msi_attrib.is_64)
		return -EINVAL;

	if (bussoft == NULL)
		return -EINVAL;

	if (provider == NULL || provider->dma_map_consistent == NULL)
		return -EINVAL;

	irq = create_irq();
	if (irq < 0)
		return irq;

	/*
         * Set up the vector plumbing.  Let the prom (via sn_intr_alloc)
         * decide which cpu to direct this msi at by default.
         */

	nasid = NASID_GET(bussoft->bs_base);
	widget = (nasid & 1) ?
			TIO_SWIN_WIDGETNUM(bussoft->bs_base) :
			SWIN_WIDGETNUM(bussoft->bs_base);

	sn_irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
	if (! sn_irq_info) {
		destroy_irq(irq);
		return -ENOMEM;
	}

	status = sn_intr_alloc(nasid, widget, sn_irq_info, irq, -1, -1);
	if (status) {
		kfree(sn_irq_info);
		destroy_irq(irq);
		return -ENOMEM;
	}

	sn_irq_info->irq_int_bit = -1;		/* mark this as an MSI irq */
	sn_irq_fixup(pdev, sn_irq_info);

	/* Prom probably should fill these in, but doesn't ... */
	sn_irq_info->irq_bridge_type = bussoft->bs_asic_type;
	sn_irq_info->irq_bridge = (void *)bussoft->bs_base;

	/*
         * Map the xio address into bus space
         */
	bus_addr = (*provider->dma_map_consistent)(pdev,
					sn_irq_info->irq_xtalkaddr,
					sizeof(sn_irq_info->irq_xtalkaddr),
					SN_DMA_MSI|SN_DMA_ADDR_XIO);
	if (! bus_addr) {
		sn_intr_free(nasid, widget, sn_irq_info);
		kfree(sn_irq_info);
		destroy_irq(irq);
		return -ENOMEM;
	}

	sn_msi_info[irq].sn_irq_info = sn_irq_info;
	sn_msi_info[irq].pci_addr = bus_addr;

	msg.address_hi = (u32)(bus_addr >> 32);
	msg.address_lo = (u32)(bus_addr & 0x00000000ffffffff);

	/*
         * In the SN platform, bit 16 is a "send vector" bit which
         * must be present in order to move the vector through the system.
         */
	msg.data = 0x100 + irq;

	irq_set_msi_desc(irq, entry);
	pci_write_msi_msg(irq, &msg);
	irq_set_chip_and_handler(irq, &sn_msi_chip, handle_edge_irq);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mark Maule
289
74.68%
1
14.29%
Eric W. Biedermann
88
22.74%
3
42.86%
Michael Ellerman
7
1.81%
1
14.29%
Thomas Gleixner
2
0.52%
1
14.29%
Jiang Liu
1
0.26%
1
14.29%
Total
387
100.00%
7
100.00%

#ifdef CONFIG_SMP


static int sn_set_msi_irq_affinity(struct irq_data *data,
				   const struct cpumask *cpu_mask, bool force)
{
	struct msi_msg msg;
	int slice;
	nasid_t nasid;
	u64 bus_addr;
	struct pci_dev *pdev;
	struct pcidev_info *sn_pdev;
	struct sn_irq_info *sn_irq_info;
	struct sn_irq_info *new_irq_info;
	struct sn_pcibus_provider *provider;
	unsigned int cpu, irq = data->irq;

	cpu = cpumask_first_and(cpu_mask, cpu_online_mask);
	sn_irq_info = sn_msi_info[irq].sn_irq_info;
	if (sn_irq_info == NULL || sn_irq_info->irq_int_bit >= 0)
		return -1;

	/*
         * Release XIO resources for the old MSI PCI address
         */

	__get_cached_msi_msg(irq_data_get_msi_desc(data), &msg);
	sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
	pdev = sn_pdev->pdi_linux_pcidev;
	provider = SN_PCIDEV_BUSPROVIDER(pdev);

	bus_addr = (u64)(msg.address_hi) << 32 | (u64)(msg.address_lo);
	(*provider->dma_unmap)(pdev, bus_addr, PCI_DMA_FROMDEVICE);
	sn_msi_info[irq].pci_addr = 0;

	nasid = cpuid_to_nasid(cpu);
	slice = cpuid_to_slice(cpu);

	new_irq_info = sn_retarget_vector(sn_irq_info, nasid, slice);
	sn_msi_info[irq].sn_irq_info = new_irq_info;
	if (new_irq_info == NULL)
		return -1;

	/*
         * Map the xio address into bus space
         */

	bus_addr = (*provider->dma_map_consistent)(pdev,
					new_irq_info->irq_xtalkaddr,
					sizeof(new_irq_info->irq_xtalkaddr),
					SN_DMA_MSI|SN_DMA_ADDR_XIO);

	sn_msi_info[irq].pci_addr = bus_addr;
	msg.address_hi = (u32)(bus_addr >> 32);
	msg.address_lo = (u32)(bus_addr & 0x00000000ffffffff);

	pci_write_msi_msg(irq, &msg);
	cpumask_copy(irq_data_get_affinity_mask(data), cpu_mask);

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Mark Maule
215
69.13%
1
8.33%
Eric W. Biedermann
50
16.08%
2
16.67%
Thomas Gleixner
17
5.47%
2
16.67%
Yinghai Lu
12
3.86%
1
8.33%
Jiang Liu
7
2.25%
3
25.00%
Rusty Russell
4
1.29%
1
8.33%
Mike Travis
4
1.29%
1
8.33%
Yijing Wang
2
0.64%
1
8.33%
Total
311
100.00%
12
100.00%

#endif /* CONFIG_SMP */



static void sn_ack_msi_irq(struct irq_data *data)
{
	irq_move_irq(data);
	ia64_eoi();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
13
68.42%
1
33.33%
Thomas Gleixner
6
31.58%
2
66.67%
Total
19
100.00%
3
100.00%



static int sn_msi_retrigger_irq(struct irq_data *data)
{
	unsigned int vector = data->irq;
	ia64_resend_irq(vector);

	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
20
74.07%
1
33.33%
Thomas Gleixner
6
22.22%
1
33.33%
Mark Maule
1
3.70%
1
33.33%
Total
27
100.00%
3
100.00%


static struct irq_chip sn_msi_chip = {
	.name			= "PCI-MSI",
	.irq_mask		= pci_msi_mask_irq,
	.irq_unmask		= pci_msi_unmask_irq,
	.irq_ack		= sn_ack_msi_irq,
#ifdef CONFIG_SMP
	.irq_set_affinity	= sn_set_msi_irq_affinity,
#endif
	.irq_retrigger		= sn_msi_retrigger_irq,
};
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Mark Maule
728
70.89%
2
10.00%
Eric W. Biedermann
221
21.52%
3
15.00%
Thomas Gleixner
38
3.70%
6
30.00%
Yinghai Lu
12
1.17%
1
5.00%
Jiang Liu
8
0.78%
3
15.00%
Michael Ellerman
7
0.68%
1
5.00%
Rusty Russell
4
0.39%
1
5.00%
Mike Travis
4
0.39%
1
5.00%
Tejun Heo
3
0.29%
1
5.00%
Yijing Wang
2
0.19%
1
5.00%
Total
1027
100.00%
20
100.00%
Directory: arch/ia64/sn/kernel

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.