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linux_dsm_epyc7002/drivers/ide/serverworks.c
Dan Carpenter ce1f31b4c0 ide: serverworks: potential overflow in svwks_set_pio_mode() 
The "drive->dn" variable is a u8 controlled by root.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-01-20 13:38:27 +01:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 1998-2000 Michel Aubry
* Copyright (C) 1998-2000 Andrzej Krzysztofowicz
* Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>
* Copyright (C) 2007-2010 Bartlomiej Zolnierkiewicz
* Portions copyright (c) 2001 Sun Microsystems
*
*
* RCC/ServerWorks IDE driver for Linux
*
* OSB4: `Open South Bridge' IDE Interface (fn 1)
* supports UDMA mode 2 (33 MB/s)
*
* CSB5: `Champion South Bridge' IDE Interface (fn 1)
* all revisions support UDMA mode 4 (66 MB/s)
* revision A2.0 and up support UDMA mode 5 (100 MB/s)
*
* *** The CSB5 does not provide ANY register ***
* *** to detect 80-conductor cable presence. ***
*
* CSB6: `Champion South Bridge' IDE Interface (optional: third channel)
*
* HT1000: AKA BCM5785 - Hypertransport Southbridge for Opteron systems. IDE
* controller same as the CSB6. Single channel ATA100 only.
*
* Documentation:
* Available under NDA only. Errata info very hard to get.
*
*/
#include <linux/types.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include <linux/init.h>
#include <asm/io.h>
#define DRV_NAME "serverworks"
#define SVWKS_CSB5_REVISION_NEW 0x92 /* min PCI_REVISION_ID for UDMA5 (A2.0) */
#define SVWKS_CSB6_REVISION 0xa0 /* min PCI_REVISION_ID for UDMA4 (A1.0) */
/* Seagate Barracuda ATA IV Family drives in UDMA mode 5
* can overrun their FIFOs when used with the CSB5 */
static const char *svwks_bad_ata100[] = {
"ST320011A",
"ST340016A",
"ST360021A",
"ST380021A",
NULL
};
static int check_in_drive_lists (ide_drive_t *drive, const char **list)
{
char *m = (char *)&drive->id[ATA_ID_PROD];
while (*list)
if (!strcmp(*list++, m))
return 1;
return 0;
}
static u8 svwks_udma_filter(ide_drive_t *drive)
{
struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
if (dev->device == PCI_DEVICE_ID_SERVERWORKS_HT1000IDE) {
return 0x1f;
} else if (dev->revision < SVWKS_CSB5_REVISION_NEW) {
return 0x07;
} else {
u8 btr = 0, mode, mask;
pci_read_config_byte(dev, 0x5A, &btr);
mode = btr & 0x3;
/* If someone decides to do UDMA133 on CSB5 the same
issue will bite so be inclusive */
if (mode > 2 && check_in_drive_lists(drive, svwks_bad_ata100))
mode = 2;
switch(mode) {
case 3: mask = 0x3f; break;
case 2: mask = 0x1f; break;
case 1: mask = 0x07; break;
default: mask = 0x00; break;
}
return mask;
}
}
static u8 svwks_csb_check (struct pci_dev *dev)
{
switch (dev->device) {
case PCI_DEVICE_ID_SERVERWORKS_CSB5IDE:
case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE:
case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2:
case PCI_DEVICE_ID_SERVERWORKS_HT1000IDE:
return 1;
default:
break;
}
return 0;
}
static void svwks_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
static const u8 pio_modes[] = { 0x5d, 0x47, 0x34, 0x22, 0x20 };
static const u8 drive_pci[] = { 0x41, 0x40, 0x43, 0x42 };
struct pci_dev *dev = to_pci_dev(hwif->dev);
const u8 pio = drive->pio_mode - XFER_PIO_0;
if (drive->dn >= ARRAY_SIZE(drive_pci))
return;
pci_write_config_byte(dev, drive_pci[drive->dn], pio_modes[pio]);
if (svwks_csb_check(dev)) {
u16 csb_pio = 0;
pci_read_config_word(dev, 0x4a, &csb_pio);
csb_pio &= ~(0x0f << (4 * drive->dn));
csb_pio |= (pio << (4 * drive->dn));
pci_write_config_word(dev, 0x4a, csb_pio);
}
}
static void svwks_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
static const u8 udma_modes[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05 };
static const u8 dma_modes[] = { 0x77, 0x21, 0x20 };
static const u8 drive_pci2[] = { 0x45, 0x44, 0x47, 0x46 };
struct pci_dev *dev = to_pci_dev(hwif->dev);
const u8 speed = drive->dma_mode;
u8 unit = drive->dn & 1;
u8 ultra_enable = 0, ultra_timing = 0, dma_timing = 0;
if (drive->dn >= ARRAY_SIZE(drive_pci2))
return;
pci_read_config_byte(dev, (0x56|hwif->channel), &ultra_timing);
pci_read_config_byte(dev, 0x54, &ultra_enable);
ultra_timing &= ~(0x0F << (4*unit));
ultra_enable &= ~(0x01 << drive->dn);
if (speed >= XFER_UDMA_0) {
dma_timing |= dma_modes[2];
ultra_timing |= (udma_modes[speed - XFER_UDMA_0] << (4 * unit));
ultra_enable |= (0x01 << drive->dn);
} else if (speed >= XFER_MW_DMA_0)
dma_timing |= dma_modes[speed - XFER_MW_DMA_0];
pci_write_config_byte(dev, drive_pci2[drive->dn], dma_timing);
pci_write_config_byte(dev, (0x56|hwif->channel), ultra_timing);
pci_write_config_byte(dev, 0x54, ultra_enable);
}
static int init_chipset_svwks(struct pci_dev *dev)
{
unsigned int reg;
u8 btr;
/* force Master Latency Timer value to 64 PCICLKs */
pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0x40);
/* OSB4 : South Bridge and IDE */
if (dev->device == PCI_DEVICE_ID_SERVERWORKS_OSB4IDE) {
struct pci_dev *isa_dev =
pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
PCI_DEVICE_ID_SERVERWORKS_OSB4, NULL);
if (isa_dev) {
pci_read_config_dword(isa_dev, 0x64, &reg);
reg &= ~0x00002000; /* disable 600ns interrupt mask */
if(!(reg & 0x00004000))
printk(KERN_DEBUG DRV_NAME " %s: UDMA not BIOS "
"enabled.\n", pci_name(dev));
reg |= 0x00004000; /* enable UDMA/33 support */
pci_write_config_dword(isa_dev, 0x64, reg);
pci_dev_put(isa_dev);
}
}
/* setup CSB5/CSB6 : South Bridge and IDE option RAID */
else if ((dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5IDE) ||
(dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE) ||
(dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2)) {
/* Third Channel Test */
if (!(PCI_FUNC(dev->devfn) & 1)) {
struct pci_dev * findev = NULL;
u32 reg4c = 0;
findev = pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
PCI_DEVICE_ID_SERVERWORKS_CSB5, NULL);
if (findev) {
pci_read_config_dword(findev, 0x4C, &reg4c);
reg4c &= ~0x000007FF;
reg4c |= 0x00000040;
reg4c |= 0x00000020;
pci_write_config_dword(findev, 0x4C, reg4c);
pci_dev_put(findev);
}
outb_p(0x06, 0x0c00);
dev->irq = inb_p(0x0c01);
} else {
struct pci_dev * findev = NULL;
u8 reg41 = 0;
findev = pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
PCI_DEVICE_ID_SERVERWORKS_CSB6, NULL);
if (findev) {
pci_read_config_byte(findev, 0x41, &reg41);
reg41 &= ~0x40;
pci_write_config_byte(findev, 0x41, reg41);
pci_dev_put(findev);
}
/*
* This is a device pin issue on CSB6.
* Since there will be a future raid mode,
* early versions of the chipset require the
* interrupt pin to be set, and it is a compatibility
* mode issue.
*/
if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE)
dev->irq = 0;
}
// pci_read_config_dword(dev, 0x40, &pioreg)
// pci_write_config_dword(dev, 0x40, 0x99999999);
// pci_read_config_dword(dev, 0x44, &dmareg);
// pci_write_config_dword(dev, 0x44, 0xFFFFFFFF);
/* setup the UDMA Control register
*
* 1. clear bit 6 to enable DMA
* 2. enable DMA modes with bits 0-1
* 00 : legacy
* 01 : udma2
* 10 : udma2/udma4
* 11 : udma2/udma4/udma5
*/
pci_read_config_byte(dev, 0x5A, &btr);
btr &= ~0x40;
if (!(PCI_FUNC(dev->devfn) & 1))
btr |= 0x2;
else
btr |= (dev->revision >= SVWKS_CSB5_REVISION_NEW) ? 0x3 : 0x2;
pci_write_config_byte(dev, 0x5A, btr);
}
/* Setup HT1000 SouthBridge Controller - Single Channel Only */
else if (dev->device == PCI_DEVICE_ID_SERVERWORKS_HT1000IDE) {
pci_read_config_byte(dev, 0x5A, &btr);
btr &= ~0x40;
btr |= 0x3;
pci_write_config_byte(dev, 0x5A, btr);
}
return 0;
}
static u8 ata66_svwks_svwks(ide_hwif_t *hwif)
{
return ATA_CBL_PATA80;
}
/* On Dell PowerEdge servers with a CSB5/CSB6, the top two bits
* of the subsystem device ID indicate presence of an 80-pin cable.
* Bit 15 clear = secondary IDE channel does not have 80-pin cable.
* Bit 15 set = secondary IDE channel has 80-pin cable.
* Bit 14 clear = primary IDE channel does not have 80-pin cable.
* Bit 14 set = primary IDE channel has 80-pin cable.
*/
static u8 ata66_svwks_dell(ide_hwif_t *hwif)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
if (dev->subsystem_vendor == PCI_VENDOR_ID_DELL &&
dev->vendor == PCI_VENDOR_ID_SERVERWORKS &&
(dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5IDE ||
dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE))
return ((1 << (hwif->channel + 14)) &
dev->subsystem_device) ? ATA_CBL_PATA80 : ATA_CBL_PATA40;
return ATA_CBL_PATA40;
}
/* Sun Cobalt Alpine hardware avoids the 80-pin cable
* detect issue by attaching the drives directly to the board.
* This check follows the Dell precedent (how scary is that?!)
*
* WARNING: this only works on Alpine hardware!
*/
static u8 ata66_svwks_cobalt(ide_hwif_t *hwif)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
if (dev->subsystem_vendor == PCI_VENDOR_ID_SUN &&
dev->vendor == PCI_VENDOR_ID_SERVERWORKS &&
dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5IDE)
return ((1 << (hwif->channel + 14)) &
dev->subsystem_device) ? ATA_CBL_PATA80 : ATA_CBL_PATA40;
return ATA_CBL_PATA40;
}
static u8 svwks_cable_detect(ide_hwif_t *hwif)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
/* Server Works */
if (dev->subsystem_vendor == PCI_VENDOR_ID_SERVERWORKS)
return ata66_svwks_svwks (hwif);
/* Dell PowerEdge */
if (dev->subsystem_vendor == PCI_VENDOR_ID_DELL)
return ata66_svwks_dell (hwif);
/* Cobalt Alpine */
if (dev->subsystem_vendor == PCI_VENDOR_ID_SUN)
return ata66_svwks_cobalt (hwif);
/* Per Specified Design by OEM, and ASIC Architect */
if ((dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE) ||
(dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2))
return ATA_CBL_PATA80;
return ATA_CBL_PATA40;
}
static const struct ide_port_ops osb4_port_ops = {
.set_pio_mode = svwks_set_pio_mode,
.set_dma_mode = svwks_set_dma_mode,
};
static const struct ide_port_ops svwks_port_ops = {
.set_pio_mode = svwks_set_pio_mode,
.set_dma_mode = svwks_set_dma_mode,
.udma_filter = svwks_udma_filter,
.cable_detect = svwks_cable_detect,
};
static const struct ide_port_info serverworks_chipsets[] = {
{ /* 0: OSB4 */
.name = DRV_NAME,
.init_chipset = init_chipset_svwks,
.port_ops = &osb4_port_ops,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = 0x00, /* UDMA is problematic on OSB4 */
},
{ /* 1: CSB5 */
.name = DRV_NAME,
.init_chipset = init_chipset_svwks,
.port_ops = &svwks_port_ops,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA5,
},
{ /* 2: CSB6 */
.name = DRV_NAME,
.init_chipset = init_chipset_svwks,
.port_ops = &svwks_port_ops,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA5,
},
{ /* 3: CSB6-2 */
.name = DRV_NAME,
.init_chipset = init_chipset_svwks,
.port_ops = &svwks_port_ops,
.host_flags = IDE_HFLAG_SINGLE,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA5,
},
{ /* 4: HT1000 */
.name = DRV_NAME,
.init_chipset = init_chipset_svwks,
.port_ops = &svwks_port_ops,
.host_flags = IDE_HFLAG_SINGLE,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA5,
}
};
/**
* svwks_init_one - called when a OSB/CSB is found
* @dev: the svwks device
* @id: the matching pci id
*
* Called when the PCI registration layer (or the IDE initialization)
* finds a device matching our IDE device tables.
*/
static int svwks_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
struct ide_port_info d;
u8 idx = id->driver_data;
d = serverworks_chipsets[idx];
if (idx == 1)
d.host_flags |= IDE_HFLAG_CLEAR_SIMPLEX;
else if (idx == 2 || idx == 3) {
if ((PCI_FUNC(dev->devfn) & 1) == 0) {
if (pci_resource_start(dev, 0) != 0x01f1)
d.host_flags |= IDE_HFLAG_NON_BOOTABLE;
d.host_flags |= IDE_HFLAG_SINGLE;
} else
d.host_flags &= ~IDE_HFLAG_SINGLE;
}
return ide_pci_init_one(dev, &d, NULL);
}
static const struct pci_device_id svwks_pci_tbl[] = {
{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_OSB4IDE), 0 },
{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB5IDE), 1 },
{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6IDE), 2 },
{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2), 3 },
{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_HT1000IDE), 4 },
{ 0, },
};
MODULE_DEVICE_TABLE(pci, svwks_pci_tbl);
static struct pci_driver svwks_pci_driver = {
.name = "Serverworks_IDE",
.id_table = svwks_pci_tbl,
.probe = svwks_init_one,
.remove = ide_pci_remove,
.suspend = ide_pci_suspend,
.resume = ide_pci_resume,
};
static int __init svwks_ide_init(void)
{
return ide_pci_register_driver(&svwks_pci_driver);
}
static void __exit svwks_ide_exit(void)
{
pci_unregister_driver(&svwks_pci_driver);
}
module_init(svwks_ide_init);
module_exit(svwks_ide_exit);
MODULE_AUTHOR("Michael Aubry. Andrzej Krzysztofowicz, Andre Hedrick, Bartlomiej Zolnierkiewicz");
MODULE_DESCRIPTION("PCI driver module for Serverworks OSB4/CSB5/CSB6 IDE");
MODULE_LICENSE("GPL");
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