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// SPDX-License-Identifier: GPL-2.0-only
/*
* AMD Passthru DMA device driver
* -- Based on the CCP driver
*
* Copyright (C) 2016,2021 Advanced Micro Devices, Inc.
*
* Author: Sanjay R Mehta <sanju.mehta@amd.com>
* Author: Tom Lendacky <thomas.lendacky@amd.com>
* Author: Gary R Hook <gary.hook@amd.com>
*/
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/pci_ids.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include "ptdma.h"
struct pt_msix {
int msix_count;
struct msix_entry msix_entry;
};
/*
* pt_alloc_struct - allocate and initialize the pt_device struct
*
* @dev: device struct of the PTDMA
*/
static struct pt_device *pt_alloc_struct(struct device *dev)
{
struct pt_device *pt;
pt = devm_kzalloc(dev, sizeof(*pt), GFP_KERNEL);
if (!pt)
return NULL;
pt->dev = dev;
INIT_LIST_HEAD(&pt->cmd);
return pt;
}
static int pt_get_msix_irqs(struct pt_device *pt)
{
struct pt_msix *pt_msix = pt->pt_msix;
struct device *dev = pt->dev;
struct pci_dev *pdev = to_pci_dev(dev);
int ret;
pt_msix->msix_entry.entry = 0;
ret = pci_enable_msix_range(pdev, &pt_msix->msix_entry, 1, 1);
if (ret < 0)
return ret;
pt_msix->msix_count = ret;
pt->pt_irq = pt_msix->msix_entry.vector;
return 0;
}
static int pt_get_msi_irq(struct pt_device *pt)
{
struct device *dev = pt->dev;
struct pci_dev *pdev = to_pci_dev(dev);
int ret;
ret = pci_enable_msi(pdev);
if (ret)
return ret;
pt->pt_irq = pdev->irq;
return 0;
}
static int pt_get_irqs(struct pt_device *pt)
{
struct device *dev = pt->dev;
int ret;
ret = pt_get_msix_irqs(pt);
if (!ret)
return 0;
/* Couldn't get MSI-X vectors, try MSI */
dev_err(dev, "could not enable MSI-X (%d), trying MSI\n", ret);
ret = pt_get_msi_irq(pt);
if (!ret)
return 0;
/* Couldn't get MSI interrupt */
dev_err(dev, "could not enable MSI (%d)\n", ret);
return ret;
}
static void pt_free_irqs(struct pt_device *pt)
{
struct pt_msix *pt_msix = pt->pt_msix;
struct device *dev = pt->dev;
struct pci_dev *pdev = to_pci_dev(dev);
if (pt_msix->msix_count)
pci_disable_msix(pdev);
else if (pt->pt_irq)
pci_disable_msi(pdev);
pt->pt_irq = 0;
}
static int pt_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct pt_device *pt;
struct pt_msix *pt_msix;
struct device *dev = &pdev->dev;
void __iomem * const *iomap_table;
int bar_mask;
int ret = -ENOMEM;
pt = pt_alloc_struct(dev);
if (!pt)
goto e_err;
pt_msix = devm_kzalloc(dev, sizeof(*pt_msix), GFP_KERNEL);
if (!pt_msix)
goto e_err;
pt->pt_msix = pt_msix;
pt->dev_vdata = (struct pt_dev_vdata *)id->driver_data;
if (!pt->dev_vdata) {
ret = -ENODEV;
dev_err(dev, "missing driver data\n");
goto e_err;
}
ret = pcim_enable_device(pdev);
if (ret) {
dev_err(dev, "pcim_enable_device failed (%d)\n", ret);
goto e_err;
}
bar_mask = pci_select_bars(pdev, IORESOURCE_MEM);
ret = pcim_iomap_regions(pdev, bar_mask, "ptdma");
if (ret) {
dev_err(dev, "pcim_iomap_regions failed (%d)\n", ret);
goto e_err;
}
iomap_table = pcim_iomap_table(pdev);
if (!iomap_table) {
dev_err(dev, "pcim_iomap_table failed\n");
ret = -ENOMEM;
goto e_err;
}
pt->io_regs = iomap_table[pt->dev_vdata->bar];
if (!pt->io_regs) {
dev_err(dev, "ioremap failed\n");
ret = -ENOMEM;
goto e_err;
}
ret = pt_get_irqs(pt);
if (ret)
goto e_err;
pci_set_master(pdev);
ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
if (ret) {
ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
if (ret) {
dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n",
ret);
goto e_err;
}
}
dev_set_drvdata(dev, pt);
if (pt->dev_vdata)
ret = pt_core_init(pt);
if (ret)
goto e_err;
return 0;
e_err:
dev_err(dev, "initialization failed ret = %d\n", ret);
return ret;
}
static void pt_pci_remove(struct pci_dev *pdev)
{
struct device *dev = &pdev->dev;
struct pt_device *pt = dev_get_drvdata(dev);
if (!pt)
return;
if (pt->dev_vdata)
pt_core_destroy(pt);
pt_free_irqs(pt);
}
static const struct pt_dev_vdata dev_vdata[] = {
{
.bar = 2,
},
};
static const struct pci_device_id pt_pci_table[] = {
{ PCI_VDEVICE(AMD, 0x1498), (kernel_ulong_t)&dev_vdata[0] },
/* Last entry must be zero */
{ 0, }
};
MODULE_DEVICE_TABLE(pci, pt_pci_table);
static struct pci_driver pt_pci_driver = {
.name = "ptdma",
.id_table = pt_pci_table,
.probe = pt_pci_probe,
.remove = pt_pci_remove,
};
module_pci_driver(pt_pci_driver);
MODULE_AUTHOR("Sanjay R Mehta <sanju.mehta@amd.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("AMD PassThru DMA driver");
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