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init.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Intel I/OAT DMA Linux driver
* Copyright(c) 2004 - 2015 Intel Corporation.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/dmaengine.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/workqueue.h>
#include <linux/prefetch.h>
#include <linux/dca.h>
#include <linux/aer.h>
#include <linux/sizes.h>
#include "dma.h"
#include "registers.h"
#include "hw.h"
#include "../dmaengine.h"
MODULE_VERSION(IOAT_DMA_VERSION);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Intel Corporation");
static const struct pci_device_id ioat_pci_tbl[] = {
/* I/OAT v3 platforms */
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },
/* I/OAT v3.2 platforms */
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB0) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB1) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB2) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB3) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB4) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB5) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB6) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB7) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB8) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB9) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB0) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB1) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB2) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB3) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB4) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB5) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB6) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB7) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB8) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB9) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW0) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW1) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW2) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW3) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW4) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW5) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW6) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW7) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW8) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW9) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX0) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX1) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX2) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX3) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX4) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX5) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX6) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX7) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX8) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX9) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SKX) },
/* I/OAT v3.3 platforms */
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD0) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD1) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD2) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD3) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE0) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE1) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE2) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE3) },
/* I/OAT v3.4 platforms */
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_ICX) },
{ 0, }
};
MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);
static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id);
static void ioat_remove(struct pci_dev *pdev);
static void
ioat_init_channel(struct ioatdma_device *ioat_dma,
struct ioatdma_chan *ioat_chan, int idx);
static void ioat_intr_quirk(struct ioatdma_device *ioat_dma);
static void ioat_enumerate_channels(struct ioatdma_device *ioat_dma);
static int ioat3_dma_self_test(struct ioatdma_device *ioat_dma);
static int ioat_dca_enabled = 1;
module_param(ioat_dca_enabled, int, 0644);
MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
int ioat_pending_level = 7;
module_param(ioat_pending_level, int, 0644);
MODULE_PARM_DESC(ioat_pending_level,
"high-water mark for pushing ioat descriptors (default: 7)");
static char ioat_interrupt_style[32] = "msix";
module_param_string(ioat_interrupt_style, ioat_interrupt_style,
sizeof(ioat_interrupt_style), 0644);
MODULE_PARM_DESC(ioat_interrupt_style,
"set ioat interrupt style: msix (default), msi, intx");
struct kmem_cache *ioat_cache;
struct kmem_cache *ioat_sed_cache;
static bool is_jf_ioat(struct pci_dev *pdev)
{
switch (pdev->device) {
case PCI_DEVICE_ID_INTEL_IOAT_JSF0:
case PCI_DEVICE_ID_INTEL_IOAT_JSF1:
case PCI_DEVICE_ID_INTEL_IOAT_JSF2:
case PCI_DEVICE_ID_INTEL_IOAT_JSF3:
case PCI_DEVICE_ID_INTEL_IOAT_JSF4:
case PCI_DEVICE_ID_INTEL_IOAT_JSF5:
case PCI_DEVICE_ID_INTEL_IOAT_JSF6:
case PCI_DEVICE_ID_INTEL_IOAT_JSF7:
case PCI_DEVICE_ID_INTEL_IOAT_JSF8:
case PCI_DEVICE_ID_INTEL_IOAT_JSF9:
return true;
default:
return false;
}
}
static bool is_snb_ioat(struct pci_dev *pdev)
{
switch (pdev->device) {
case PCI_DEVICE_ID_INTEL_IOAT_SNB0:
case PCI_DEVICE_ID_INTEL_IOAT_SNB1:
case PCI_DEVICE_ID_INTEL_IOAT_SNB2:
case PCI_DEVICE_ID_INTEL_IOAT_SNB3:
case PCI_DEVICE_ID_INTEL_IOAT_SNB4:
case PCI_DEVICE_ID_INTEL_IOAT_SNB5:
case PCI_DEVICE_ID_INTEL_IOAT_SNB6:
case PCI_DEVICE_ID_INTEL_IOAT_SNB7:
case PCI_DEVICE_ID_INTEL_IOAT_SNB8:
case PCI_DEVICE_ID_INTEL_IOAT_SNB9:
return true;
default:
return false;
}
}
static bool is_ivb_ioat(struct pci_dev *pdev)
{
switch (pdev->device) {
case PCI_DEVICE_ID_INTEL_IOAT_IVB0:
case PCI_DEVICE_ID_INTEL_IOAT_IVB1:
case PCI_DEVICE_ID_INTEL_IOAT_IVB2:
case PCI_DEVICE_ID_INTEL_IOAT_IVB3:
case PCI_DEVICE_ID_INTEL_IOAT_IVB4:
case PCI_DEVICE_ID_INTEL_IOAT_IVB5:
case PCI_DEVICE_ID_INTEL_IOAT_IVB6:
case PCI_DEVICE_ID_INTEL_IOAT_IVB7:
case PCI_DEVICE_ID_INTEL_IOAT_IVB8:
case PCI_DEVICE_ID_INTEL_IOAT_IVB9:
return true;
default:
return false;
}
}
static bool is_hsw_ioat(struct pci_dev *pdev)
{
switch (pdev->device) {
case PCI_DEVICE_ID_INTEL_IOAT_HSW0:
case PCI_DEVICE_ID_INTEL_IOAT_HSW1:
case PCI_DEVICE_ID_INTEL_IOAT_HSW2:
case PCI_DEVICE_ID_INTEL_IOAT_HSW3:
case PCI_DEVICE_ID_INTEL_IOAT_HSW4:
case PCI_DEVICE_ID_INTEL_IOAT_HSW5:
case PCI_DEVICE_ID_INTEL_IOAT_HSW6:
case PCI_DEVICE_ID_INTEL_IOAT_HSW7:
case PCI_DEVICE_ID_INTEL_IOAT_HSW8:
case PCI_DEVICE_ID_INTEL_IOAT_HSW9:
return true;
default:
return false;
}
}
static bool is_bdx_ioat(struct pci_dev *pdev)
{
switch (pdev->device) {
case PCI_DEVICE_ID_INTEL_IOAT_BDX0:
case PCI_DEVICE_ID_INTEL_IOAT_BDX1:
case PCI_DEVICE_ID_INTEL_IOAT_BDX2:
case PCI_DEVICE_ID_INTEL_IOAT_BDX3:
case PCI_DEVICE_ID_INTEL_IOAT_BDX4:
case PCI_DEVICE_ID_INTEL_IOAT_BDX5:
case PCI_DEVICE_ID_INTEL_IOAT_BDX6:
case PCI_DEVICE_ID_INTEL_IOAT_BDX7:
case PCI_DEVICE_ID_INTEL_IOAT_BDX8:
case PCI_DEVICE_ID_INTEL_IOAT_BDX9:
return true;
default:
return false;
}
}
static inline bool is_skx_ioat(struct pci_dev *pdev)
{
return (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_SKX) ? true : false;
}
static bool is_xeon_cb32(struct pci_dev *pdev)
{
return is_jf_ioat(pdev) || is_snb_ioat(pdev) || is_ivb_ioat(pdev) ||
is_hsw_ioat(pdev) || is_bdx_ioat(pdev) || is_skx_ioat(pdev);
}
bool is_bwd_ioat(struct pci_dev *pdev)
{
switch (pdev->device) {
case PCI_DEVICE_ID_INTEL_IOAT_BWD0:
case PCI_DEVICE_ID_INTEL_IOAT_BWD1:
case PCI_DEVICE_ID_INTEL_IOAT_BWD2:
case PCI_DEVICE_ID_INTEL_IOAT_BWD3:
/* even though not Atom, BDX-DE has same DMA silicon */
case PCI_DEVICE_ID_INTEL_IOAT_BDXDE0:
case PCI_DEVICE_ID_INTEL_IOAT_BDXDE1:
case PCI_DEVICE_ID_INTEL_IOAT_BDXDE2:
case PCI_DEVICE_ID_INTEL_IOAT_BDXDE3:
return true;
default:
return false;
}
}
static bool is_bwd_noraid(struct pci_dev *pdev)
{
switch (pdev->device) {
case PCI_DEVICE_ID_INTEL_IOAT_BWD2:
case PCI_DEVICE_ID_INTEL_IOAT_BWD3:
case PCI_DEVICE_ID_INTEL_IOAT_BDXDE0:
case PCI_DEVICE_ID_INTEL_IOAT_BDXDE1:
case PCI_DEVICE_ID_INTEL_IOAT_BDXDE2:
case PCI_DEVICE_ID_INTEL_IOAT_BDXDE3:
return true;
default:
return false;
}
}
/*
* Perform a IOAT transaction to verify the HW works.
*/
#define IOAT_TEST_SIZE 2000
static void ioat_dma_test_callback(void *dma_async_param)
{
struct completion *cmp = dma_async_param;
complete(cmp);
}
/**
* ioat_dma_self_test - Perform a IOAT transaction to verify the HW works.
* @ioat_dma: dma device to be tested
*/
static int ioat_dma_self_test(struct ioatdma_device *ioat_dma)
{
int i;
u8 *src;
u8 *dest;
struct dma_device *dma = &ioat_dma->dma_dev;
struct device *dev = &ioat_dma->pdev->dev;
struct dma_chan *dma_chan;
struct dma_async_tx_descriptor *tx;
dma_addr_t dma_dest, dma_src;
dma_cookie_t cookie;
int err = 0;
struct completion cmp;
unsigned long tmo;
unsigned long flags;
src = kzalloc(IOAT_TEST_SIZE, GFP_KERNEL);
if (!src)
return -ENOMEM;
dest = kzalloc(IOAT_TEST_SIZE, GFP_KERNEL);
if (!dest) {
kfree(src);
return -ENOMEM;
}
/* Fill in src buffer */
for (i = 0; i < IOAT_TEST_SIZE; i++)
src[i] = (u8)i;
/* Start copy, using first DMA channel */
dma_chan = container_of(dma->channels.next, struct dma_chan,
device_node);
if (dma->device_alloc_chan_resources(dma_chan) < 1) {
dev_err(dev, "selftest cannot allocate chan resource\n");
err = -ENODEV;
goto out;
}
dma_src = dma_map_single(dev, src, IOAT_TEST_SIZE, DMA_TO_DEVICE);
if (dma_mapping_error(dev, dma_src)) {
dev_err(dev, "mapping src buffer failed\n");
err = -ENOMEM;
goto free_resources;
}
dma_dest = dma_map_single(dev, dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE);
if (dma_mapping_error(dev, dma_dest)) {
dev_err(dev, "mapping dest buffer failed\n");
err = -ENOMEM;
goto unmap_src;
}
flags = DMA_PREP_INTERRUPT;
tx = ioat_dma->dma_dev.device_prep_dma_memcpy(dma_chan, dma_dest,
dma_src, IOAT_TEST_SIZE,
flags);
if (!tx) {
dev_err(dev, "Self-test prep failed, disabling\n");
err = -ENODEV;
goto unmap_dma;
}
async_tx_ack(tx);
init_completion(&cmp);
tx->callback = ioat_dma_test_callback;
tx->callback_param = &cmp;
cookie = tx->tx_submit(tx);
if (cookie < 0) {
dev_err(dev, "Self-test setup failed, disabling\n");
err = -ENODEV;
goto unmap_dma;
}
dma->device_issue_pending(dma_chan);
tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
if (tmo == 0 ||
dma->device_tx_status(dma_chan, cookie, NULL)
!= DMA_COMPLETE) {
dev_err(dev, "Self-test copy timed out, disabling\n");
err = -ENODEV;
goto unmap_dma;
}
if (memcmp(src, dest, IOAT_TEST_SIZE)) {
dev_err(dev, "Self-test copy failed compare, disabling\n");
err = -ENODEV;
goto unmap_dma;
}
unmap_dma:
dma_unmap_single(dev, dma_dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE);
unmap_src:
dma_unmap_single(dev, dma_src, IOAT_TEST_SIZE, DMA_TO_DEVICE);
free_resources:
dma->device_free_chan_resources(dma_chan);
out:
kfree(src);
kfree(dest);
return err;
}
/**
* ioat_dma_setup_interrupts - setup interrupt handler
* @ioat_dma: ioat dma device
*/
int ioat_dma_setup_interrupts(struct ioatdma_device *ioat_dma)
{
struct ioatdma_chan *ioat_chan;
struct pci_dev *pdev = ioat_dma->pdev;
struct device *dev = &pdev->dev;
struct msix_entry *msix;
int i, j, msixcnt;
int err = -EINVAL;
u8 intrctrl = 0;
if (!strcmp(ioat_interrupt_style, "msix"))
goto msix;
if (!strcmp(ioat_interrupt_style, "msi"))
goto msi;
if (!strcmp(ioat_interrupt_style, "intx"))
goto intx;
dev_err(dev, "invalid ioat_interrupt_style %s\n", ioat_interrupt_style);
goto err_no_irq;
msix:
/* The number of MSI-X vectors should equal the number of channels */
msixcnt = ioat_dma->dma_dev.chancnt;
for (i = 0; i < msixcnt; i++)
ioat_dma->msix_entries[i].entry = i;
err = pci_enable_msix_exact(pdev, ioat_dma->msix_entries, msixcnt);
if (err)
goto msi;
for (i = 0; i < msixcnt; i++) {
msix = &ioat_dma->msix_entries[i];
ioat_chan = ioat_chan_by_index(ioat_dma, i);
err = devm_request_irq(dev, msix->vector,
ioat_dma_do_interrupt_msix, 0,
"ioat-msix", ioat_chan);
if (err) {
for (j = 0; j < i; j++) {
msix = &ioat_dma->msix_entries[j];
ioat_chan = ioat_chan_by_index(ioat_dma, j);
devm_free_irq(dev, msix->vector, ioat_chan);
}
goto msi;
}
}
intrctrl |= IOAT_INTRCTRL_MSIX_VECTOR_CONTROL;
ioat_dma->irq_mode = IOAT_MSIX;
goto done;
msi:
err = pci_enable_msi(pdev);
if (err)
goto intx;
err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt, 0,
"ioat-msi", ioat_dma);
if (err) {
pci_disable_msi(pdev);
goto intx;
}
ioat_dma->irq_mode = IOAT_MSI;
goto done;
intx:
err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt,
IRQF_SHARED, "ioat-intx", ioat_dma);
if (err)
goto err_no_irq;
ioat_dma->irq_mode = IOAT_INTX;
done:
if (is_bwd_ioat(pdev))
ioat_intr_quirk(ioat_dma);
intrctrl |= IOAT_INTRCTRL_MASTER_INT_EN;
writeb(intrctrl, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
return 0;
err_no_irq:
/* Disable all interrupt generation */
writeb(0, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
ioat_dma->irq_mode = IOAT_NOIRQ;
dev_err(dev, "no usable interrupts\n");
return err;
}
static void ioat_disable_interrupts(struct ioatdma_device *ioat_dma)
{
/* Disable all interrupt generation */
writeb(0, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
}
static int ioat_probe(struct ioatdma_device *ioat_dma)
{
int err = -ENODEV;
struct dma_device *dma = &ioat_dma->dma_dev;
struct pci_dev *pdev = ioat_dma->pdev;
struct device *dev = &pdev->dev;
ioat_dma->completion_pool = dma_pool_create("completion_pool", dev,
sizeof(u64),
SMP_CACHE_BYTES,
SMP_CACHE_BYTES);
if (!ioat_dma->completion_pool) {
err = -ENOMEM;
goto err_out;
}
ioat_enumerate_channels(ioat_dma);
dma_cap_set(DMA_MEMCPY, dma->cap_mask);
dma->dev = &pdev->dev;
if (!dma->chancnt) {
dev_err(dev, "channel enumeration error\n");
goto err_setup_interrupts;
}
err = ioat_dma_setup_interrupts(ioat_dma);
if (err)
goto err_setup_interrupts;
err = ioat3_dma_self_test(ioat_dma);
if (err)
goto err_self_test;
return 0;
err_self_test:
ioat_disable_interrupts(ioat_dma);
err_setup_interrupts:
dma_pool_destroy(ioat_dma->completion_pool);
err_out:
return err;
}
static int ioat_register(struct ioatdma_device *ioat_dma)
{
int err = dma_async_device_register(&ioat_dma->dma_dev);
if (err) {
ioat_disable_interrupts(ioat_dma);
dma_pool_destroy(ioat_dma->completion_pool);
}
return err;
}
static void ioat_dma_remove(struct ioatdma_device *ioat_dma)
{
struct dma_device *dma = &ioat_dma->dma_dev;
ioat_disable_interrupts(ioat_dma);
ioat_kobject_del(ioat_dma);
dma_async_device_unregister(dma);
}
/**
* ioat_enumerate_channels - find and initialize the device's channels
* @ioat_dma: the ioat dma device to be enumerated
*/
static void ioat_enumerate_channels(struct ioatdma_device *ioat_dma)
{
struct ioatdma_chan *ioat_chan;
struct device *dev = &ioat_dma->pdev->dev;
struct dma_device *dma = &ioat_dma->dma_dev;
u8 xfercap_log;
int i;
INIT_LIST_HEAD(&dma->channels);
dma->chancnt = readb(ioat_dma->reg_base + IOAT_CHANCNT_OFFSET);
dma->chancnt &= 0x1f; /* bits [4:0] valid */
if (dma->chancnt > ARRAY_SIZE(ioat_dma->idx)) {
dev_warn(dev, "(%d) exceeds max supported channels (%zu)\n",
dma->chancnt, ARRAY_SIZE(ioat_dma->idx));
dma->chancnt = ARRAY_SIZE(ioat_dma->idx);
}
xfercap_log = readb(ioat_dma->reg_base + IOAT_XFERCAP_OFFSET);
xfercap_log &= 0x1f; /* bits [4:0] valid */
if (xfercap_log == 0)
return;
dev_dbg(dev, "%s: xfercap = %d\n", __func__, 1 << xfercap_log);
for (i = 0; i < dma->chancnt; i++) {
ioat_chan = kzalloc(sizeof(*ioat_chan), GFP_KERNEL);
if (!ioat_chan)
break;
ioat_init_channel(ioat_dma, ioat_chan, i);
ioat_chan->xfercap_log = xfercap_log;
spin_lock_init(&ioat_chan->prep_lock);
if (ioat_reset_hw(ioat_chan)) {
i = 0;
break;
}
}
dma->chancnt = i;
}
/**
* ioat_free_chan_resources - release all the descriptors
* @c: the channel to be cleaned
*/
static void ioat_free_chan_resources(struct dma_chan *c)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
struct ioat_ring_ent *desc;
const int total_descs = 1 << ioat_chan->alloc_order;
int descs;
int i;
/* Before freeing channel resources first check
* if they have been previously allocated for this channel.
*/
if (!ioat_chan->ring)
return;
ioat_stop(ioat_chan);
if (!test_bit(IOAT_CHAN_DOWN, &ioat_chan->state)) {
ioat_reset_hw(ioat_chan);
/* Put LTR to idle */
if (ioat_dma->version >= IOAT_VER_3_4)
writeb(IOAT_CHAN_LTR_SWSEL_IDLE,
ioat_chan->reg_base +
IOAT_CHAN_LTR_SWSEL_OFFSET);
}
spin_lock_bh(&ioat_chan->cleanup_lock);
spin_lock_bh(&ioat_chan->prep_lock);
descs = ioat_ring_space(ioat_chan);
dev_dbg(to_dev(ioat_chan), "freeing %d idle descriptors\n", descs);
for (i = 0; i < descs; i++) {
desc = ioat_get_ring_ent(ioat_chan, ioat_chan->head + i);
ioat_free_ring_ent(desc, c);
}
if (descs < total_descs)
dev_err(to_dev(ioat_chan), "Freeing %d in use descriptors!\n",
total_descs - descs);
for (i = 0; i < total_descs - descs; i++) {
desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail + i);
dump_desc_dbg(ioat_chan, desc);
ioat_free_ring_ent(desc, c);
}
for (i = 0; i < ioat_chan->desc_chunks; i++) {
dma_free_coherent(to_dev(ioat_chan), IOAT_CHUNK_SIZE,
ioat_chan->descs[i].virt,
ioat_chan->descs[i].hw);
ioat_chan->descs[i].virt = NULL;
ioat_chan->descs[i].hw = 0;
}
ioat_chan->desc_chunks = 0;
kfree(ioat_chan->ring);
ioat_chan->ring = NULL;
ioat_chan->alloc_order = 0;
dma_pool_free(ioat_dma->completion_pool, ioat_chan->completion,
ioat_chan->completion_dma);
spin_unlock_bh(&ioat_chan->prep_lock);
spin_unlock_bh(&ioat_chan->cleanup_lock);
ioat_chan->last_completion = 0;
ioat_chan->completion_dma = 0;
ioat_chan->dmacount = 0;
}
/* ioat_alloc_chan_resources - allocate/initialize ioat descriptor ring
* @chan: channel to be initialized
*/
static int ioat_alloc_chan_resources(struct dma_chan *c)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
struct ioat_ring_ent **ring;
u64 status;
int order;
int i = 0;
u32 chanerr;
/* have we already been set up? */
if (ioat_chan->ring)
return 1 << ioat_chan->alloc_order;
/* Setup register to interrupt and write completion status on error */
writew(IOAT_CHANCTRL_RUN, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
/* allocate a completion writeback area */
/* doing 2 32bit writes to mmio since 1 64b write doesn't work */
ioat_chan->completion =
dma_pool_zalloc(ioat_chan->ioat_dma->completion_pool,
GFP_NOWAIT, &ioat_chan->completion_dma);
if (!ioat_chan->completion)
return -ENOMEM;
writel(((u64)ioat_chan->completion_dma) & 0x00000000FFFFFFFF,
ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_LOW);
writel(((u64)ioat_chan->completion_dma) >> 32,
ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH);
order = IOAT_MAX_ORDER;
ring = ioat_alloc_ring(c, order, GFP_NOWAIT);
if (!ring)
return -ENOMEM;
spin_lock_bh(&ioat_chan->cleanup_lock);
spin_lock_bh(&ioat_chan->prep_lock);
ioat_chan->ring = ring;
ioat_chan->head = 0;
ioat_chan->issued = 0;
ioat_chan->tail = 0;
ioat_chan->alloc_order = order;
set_bit(IOAT_RUN, &ioat_chan->state);
spin_unlock_bh(&ioat_chan->prep_lock);
spin_unlock_bh(&ioat_chan->cleanup_lock);
/* Setting up LTR values for 3.4 or later */
if (ioat_chan->ioat_dma->version >= IOAT_VER_3_4) {
u32 lat_val;
lat_val = IOAT_CHAN_LTR_ACTIVE_SNVAL |
IOAT_CHAN_LTR_ACTIVE_SNLATSCALE |
IOAT_CHAN_LTR_ACTIVE_SNREQMNT;
writel(lat_val, ioat_chan->reg_base +
IOAT_CHAN_LTR_ACTIVE_OFFSET);
lat_val = IOAT_CHAN_LTR_IDLE_SNVAL |
IOAT_CHAN_LTR_IDLE_SNLATSCALE |
IOAT_CHAN_LTR_IDLE_SNREQMNT;
writel(lat_val, ioat_chan->reg_base +
IOAT_CHAN_LTR_IDLE_OFFSET);
/* Select to active */
writeb(IOAT_CHAN_LTR_SWSEL_ACTIVE,
ioat_chan->reg_base +
IOAT_CHAN_LTR_SWSEL_OFFSET);
}
ioat_start_null_desc(ioat_chan);
/* check that we got off the ground */
do {
udelay(1);
status = ioat_chansts(ioat_chan);
} while (i++ < 20 && !is_ioat_active(status) && !is_ioat_idle(status));
if (is_ioat_active(status) || is_ioat_idle(status))
return 1 << ioat_chan->alloc_order;
chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
dev_WARN(to_dev(ioat_chan),
"failed to start channel chanerr: %#x\n", chanerr);
ioat_free_chan_resources(c);
return -EFAULT;
}
/* common channel initialization */
static void
ioat_init_channel(struct ioatdma_device *ioat_dma,
struct ioatdma_chan *ioat_chan, int idx)
{
struct dma_device *dma = &ioat_dma->dma_dev;
ioat_chan->ioat_dma = ioat_dma;
ioat_chan->reg_base = ioat_dma->reg_base + (0x80 * (idx + 1));
spin_lock_init(&ioat_chan->cleanup_lock);
ioat_chan->dma_chan.device = dma;
dma_cookie_init(&ioat_chan->dma_chan);
list_add_tail(&ioat_chan->dma_chan.device_node, &dma->channels);
ioat_dma->idx[idx] = ioat_chan;
timer_setup(&ioat_chan->timer, ioat_timer_event, 0);
tasklet_setup(&ioat_chan->cleanup_task, ioat_cleanup_event);
}
#define IOAT_NUM_SRC_TEST 6 /* must be <= 8 */
static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma)
{
int i, src_idx;
struct page *dest;
struct page *xor_srcs[IOAT_NUM_SRC_TEST];
struct page *xor_val_srcs[IOAT_NUM_SRC_TEST + 1];
dma_addr_t dma_srcs[IOAT_NUM_SRC_TEST + 1];
dma_addr_t dest_dma;
struct dma_async_tx_descriptor *tx;
struct dma_chan *dma_chan;
dma_cookie_t cookie;
u8 cmp_byte = 0;
u32 cmp_word;
u32 xor_val_result;
int err = 0;
struct completion cmp;
unsigned long tmo;
struct device *dev = &ioat_dma->pdev->dev;
struct dma_device *dma = &ioat_dma->dma_dev;
u8 op = 0;
dev_dbg(dev, "%s\n", __func__);
if (!dma_has_cap(DMA_XOR, dma->cap_mask))
return 0;
for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) {
xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
if (!xor_srcs[src_idx]) {
while (src_idx--)
__free_page(xor_srcs[src_idx]);
return -ENOMEM;
}
}
dest = alloc_page(GFP_KERNEL);
if (!dest) {
while (src_idx--)
__free_page(xor_srcs[src_idx]);
return -ENOMEM;
}
/* Fill in src buffers */
for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) {
u8 *ptr = page_address(xor_srcs[src_idx]);
for (i = 0; i < PAGE_SIZE; i++)
ptr[i] = (1 << src_idx);
}
for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++)
cmp_byte ^= (u8) (1 << src_idx);
cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
(cmp_byte << 8) | cmp_byte;
memset(page_address(dest), 0, PAGE_SIZE);
dma_chan = container_of(dma->channels.next, struct dma_chan,
device_node);
if (dma->device_alloc_chan_resources(dma_chan) < 1) {
err = -ENODEV;
goto out;
}
/* test xor */
op = IOAT_OP_XOR;
dest_dma = dma_map_page(dev, dest, 0, PAGE_SIZE, DMA_FROM_DEVICE);
if (dma_mapping_error(dev, dest_dma)) {
err = -ENOMEM;
goto free_resources;
}
for (i = 0; i < IOAT_NUM_SRC_TEST; i++) {
dma_srcs[i] = dma_map_page(dev, xor_srcs[i], 0, PAGE_SIZE,
DMA_TO_DEVICE);
if (dma_mapping_error(dev, dma_srcs[i])) {
err = -ENOMEM;
goto dma_unmap;
}
}
tx = dma->device_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
IOAT_NUM_SRC_TEST, PAGE_SIZE,
DMA_PREP_INTERRUPT);
if (!tx) {
dev_err(dev, "Self-test xor prep failed\n");
err = -ENODEV;
goto dma_unmap;
}
async_tx_ack(tx);
init_completion(&cmp);
tx->callback = ioat_dma_test_callback;
tx->callback_param = &cmp;
cookie = tx->tx_submit(tx);
if (cookie < 0) {
dev_err(dev, "Self-test xor setup failed\n");
err = -ENODEV;
goto dma_unmap;
}
dma->device_issue_pending(dma_chan);
tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
if (tmo == 0 ||
dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
dev_err(dev, "Self-test xor timed out\n");
err = -ENODEV;
goto dma_unmap;
}
for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE);
dma_sync_single_for_cpu(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
u32 *ptr = page_address(dest);
if (ptr[i] != cmp_word) {
dev_err(dev, "Self-test xor failed compare\n");
err = -ENODEV;
goto free_resources;
}
}
dma_sync_single_for_device(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
/* skip validate if the capability is not present */
if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask))
goto free_resources;
op = IOAT_OP_XOR_VAL;
/* validate the sources with the destintation page */
for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
xor_val_srcs[i] = xor_srcs[i];
xor_val_srcs[i] = dest;
xor_val_result = 1;
for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
DMA_TO_DEVICE);
if (dma_mapping_error(dev, dma_srcs[i])) {
err = -ENOMEM;
goto dma_unmap;
}
}
tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
&xor_val_result, DMA_PREP_INTERRUPT);
if (!tx) {
dev_err(dev, "Self-test zero prep failed\n");
err = -ENODEV;
goto dma_unmap;
}
async_tx_ack(tx);
init_completion(&cmp);
tx->callback = ioat_dma_test_callback;
tx->callback_param = &cmp;
cookie = tx->tx_submit(tx);
if (cookie < 0) {
dev_err(dev, "Self-test zero setup failed\n");
err = -ENODEV;
goto dma_unmap;
}
dma->device_issue_pending(dma_chan);
tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
if (tmo == 0 ||
dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
dev_err(dev, "Self-test validate timed out\n");
err = -ENODEV;
goto dma_unmap;
}
for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++)
dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE);
if (xor_val_result != 0) {
dev_err(dev, "Self-test validate failed compare\n");
err = -ENODEV;
goto free_resources;
}
memset(page_address(dest), 0, PAGE_SIZE);
/* test for non-zero parity sum */
op = IOAT_OP_XOR_VAL;
xor_val_result = 0;
for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
DMA_TO_DEVICE);
if (dma_mapping_error(dev, dma_srcs[i])) {
err = -ENOMEM;
goto dma_unmap;
}
}
tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
&xor_val_result, DMA_PREP_INTERRUPT);
if (!tx) {
dev_err(dev, "Self-test 2nd zero prep failed\n");
err = -ENODEV;
goto dma_unmap;
}
async_tx_ack(tx);
init_completion(&cmp);
tx->callback = ioat_dma_test_callback;
tx->callback_param = &cmp;
cookie = tx->tx_submit(tx);