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![Shannon Nelson](/assets/img/avatar_default.png)
Add support for version 2 of the ioatdma device. This device handles the descriptor chain and DCA services slightly differently: - Instead of moving the dma descriptors between a busy and an idle chain, this new version uses a single circular chain so that we don't have rewrite the next_descriptor pointers as we add new requests, and the device doesn't need to re-read the last descriptor. - The new device has the DCA tags defined internally instead of needing them defined statically. Signed-off-by: Shannon Nelson <shannon.nelson@intel.com> Cc: "Williams, Dan J" <dan.j.williams@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
211 lines
5.3 KiB
C
211 lines
5.3 KiB
C
/*
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* Intel I/OAT DMA Linux driver
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* Copyright(c) 2007 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* The full GNU General Public License is included in this distribution in
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* the file called "COPYING".
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*
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*/
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/*
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* This driver supports an Intel I/OAT DMA engine, which does asynchronous
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* copy operations.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <linux/dca.h>
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#include "ioatdma.h"
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#include "ioatdma_registers.h"
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#include "ioatdma_hw.h"
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MODULE_VERSION(IOAT_DMA_VERSION);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Intel Corporation");
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static struct pci_device_id ioat_pci_tbl[] = {
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/* I/OAT v1 platforms */
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT) },
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB) },
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) },
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{ PCI_DEVICE(PCI_VENDOR_ID_UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) },
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/* I/OAT v2 platforms */
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) },
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{ 0, }
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};
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struct ioat_device {
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struct pci_dev *pdev;
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void __iomem *iobase;
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struct ioatdma_device *dma;
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struct dca_provider *dca;
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};
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static int __devinit ioat_probe(struct pci_dev *pdev,
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const struct pci_device_id *id);
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static void __devexit ioat_remove(struct pci_dev *pdev);
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static int ioat_dca_enabled = 1;
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module_param(ioat_dca_enabled, int, 0644);
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MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
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static int ioat_setup_functionality(struct pci_dev *pdev, void __iomem *iobase)
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{
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struct ioat_device *device = pci_get_drvdata(pdev);
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u8 version;
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int err = 0;
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version = readb(iobase + IOAT_VER_OFFSET);
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switch (version) {
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case IOAT_VER_1_2:
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device->dma = ioat_dma_probe(pdev, iobase);
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if (device->dma && ioat_dca_enabled)
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device->dca = ioat_dca_init(pdev, iobase);
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break;
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case IOAT_VER_2_0:
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device->dma = ioat_dma_probe(pdev, iobase);
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if (device->dma && ioat_dca_enabled)
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device->dca = ioat2_dca_init(pdev, iobase);
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break;
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default:
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err = -ENODEV;
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break;
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}
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if (!device->dma)
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err = -ENODEV;
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return err;
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}
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static void ioat_shutdown_functionality(struct pci_dev *pdev)
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{
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struct ioat_device *device = pci_get_drvdata(pdev);
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dev_err(&pdev->dev, "Removing dma and dca services\n");
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if (device->dca) {
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unregister_dca_provider(device->dca);
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free_dca_provider(device->dca);
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device->dca = NULL;
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}
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if (device->dma) {
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ioat_dma_remove(device->dma);
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device->dma = NULL;
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}
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}
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static struct pci_driver ioat_pci_driver = {
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.name = "ioatdma",
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.id_table = ioat_pci_tbl,
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.probe = ioat_probe,
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.shutdown = ioat_shutdown_functionality,
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.remove = __devexit_p(ioat_remove),
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};
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static int __devinit ioat_probe(struct pci_dev *pdev,
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const struct pci_device_id *id)
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{
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void __iomem *iobase;
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struct ioat_device *device;
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unsigned long mmio_start, mmio_len;
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int err;
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err = pci_enable_device(pdev);
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if (err)
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goto err_enable_device;
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err = pci_request_regions(pdev, ioat_pci_driver.name);
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if (err)
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goto err_request_regions;
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err = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
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if (err)
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err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
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if (err)
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goto err_set_dma_mask;
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err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
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if (err)
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err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
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if (err)
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goto err_set_dma_mask;
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mmio_start = pci_resource_start(pdev, 0);
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mmio_len = pci_resource_len(pdev, 0);
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iobase = ioremap(mmio_start, mmio_len);
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if (!iobase) {
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err = -ENOMEM;
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goto err_ioremap;
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}
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device = kzalloc(sizeof(*device), GFP_KERNEL);
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if (!device) {
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err = -ENOMEM;
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goto err_kzalloc;
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}
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device->pdev = pdev;
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pci_set_drvdata(pdev, device);
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device->iobase = iobase;
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pci_set_master(pdev);
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err = ioat_setup_functionality(pdev, iobase);
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if (err)
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goto err_version;
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return 0;
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err_version:
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kfree(device);
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err_kzalloc:
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iounmap(iobase);
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err_ioremap:
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err_set_dma_mask:
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pci_release_regions(pdev);
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pci_disable_device(pdev);
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err_request_regions:
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err_enable_device:
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return err;
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}
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/*
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* It is unsafe to remove this module: if removed while a requested
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* dma is outstanding, esp. from tcp, it is possible to hang while
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* waiting for something that will never finish. However, if you're
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* feeling lucky, this usually works just fine.
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*/
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static void __devexit ioat_remove(struct pci_dev *pdev)
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{
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struct ioat_device *device = pci_get_drvdata(pdev);
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ioat_shutdown_functionality(pdev);
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kfree(device);
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}
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static int __init ioat_init_module(void)
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{
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return pci_register_driver(&ioat_pci_driver);
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}
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module_init(ioat_init_module);
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static void __exit ioat_exit_module(void)
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{
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pci_unregister_driver(&ioat_pci_driver);
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}
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module_exit(ioat_exit_module);
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