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Date: Sat, 09 Dec 2006 03:12:11 -0500
From: Ben Collins <ben.collins@...ntu.com>
To: Alan <alan@...rguk.ukuu.org.uk>
Cc: Ralf Baechle <ralf@...ux-mips.org>, Andrew Morton <akpm@...l.org>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI legacy resource fix
On Sat, 2006-12-09 at 02:46 +0000, Alan wrote:
> > Checking the patch, my problem is that the old way, all BAR's were being
> > set at start = end = flags = 0. The patch makes it set all the BAR's to
>
> Yes the old quirk used to blank the resources as the values on the chip
> are undefined and random. This gives you corrupt resource trees and needs
> hacks in the drivers as well
>
> > the normal values. This is what it looks like in lspci, pre this patch:
> >
> > Region 0: I/O ports at <unassigned>
> > Region 1: I/O ports at <unassigned>
> > Region 2: I/O ports at <unassigned>
> > Region 3: I/O ports at <unassigned>
>
> Then your device is in legacy mode, or was disabled
>
> > So my device is not running in compatibility mode, and should not have
>
> The paste you have their shows that it almost certainly is in legacy mode.
>
> > the BAR's set, as Alan's patch does.
>
> Dump the class code and other bits during boot check how your device is
> seen (native v legacy/compatibility) and whether the fixup logic
> triggers. It should only trigger for legacy devices.
You're right, I was reading this backwards.
Thing is, if I disable the quirk, ata_piix works correctly.
So I think maybe the problem is the logic here. Having the PIIX quirk
pre-reserve SATA ports that are on legacy BAR's just doesn't seem to
make sense unless libata is going to recognize that. I think it's just
an accident that it worked before.
Looking at ata_pci_init_one(), it does check for this:
if (legacy_mode) {
if (!request_region(ATA_PRIMARY_CMD, 8, "libata")) {
struct resource *conflict, res;
res.start = ATA_PRIMARY_CMD;
res.end = ATA_PRIMARY_CMD + 8 - 1;
conflict = ____request_resource(&ioport_resource, &res);
while (conflict->child)
conflict = ____request_resource(conflict, &res);
if (!strcmp(conflict->name, "libata"))
legacy_mode |= ATA_PORT_PRIMARY;
My controller is in legacy mode, however, it never gets to here because
of this call, just before this block of code:
rc = pci_request_regions(pdev, DRV_NAME);
if (rc) {
disable_dev_on_err = 0;
goto err_out;
}
So, I wrote up this patch that made things work for me. It also should
make ata_pci_init_one() work with mixed legacy/native ports on the same
controller (if there are such things). My controller is port0=SATA,
port1=PATA.
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 10ee22a..8897eba 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -852,11 +852,14 @@ #ifdef CONFIG_PCI
struct ata_probe_ent *
ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int ports)
{
- struct ata_probe_ent *probe_ent =
- ata_probe_ent_alloc(pci_dev_to_dev(pdev), port[0]);
+ struct ata_probe_ent *probe_ent;
int p = 0;
unsigned long bmdma;
+ if (!(ports & (ATA_PORT_PRIMARY|ATA_PORT_SECONDARY)))
+ return NULL;
+
+ probe_ent = ata_probe_ent_alloc(pci_dev_to_dev(pdev), port[0]);
if (!probe_ent)
return NULL;
@@ -906,6 +909,9 @@ static struct ata_probe_ent *ata_pci_ini
struct ata_probe_ent *probe_ent;
unsigned long bmdma = pci_resource_start(pdev, 4);
+ if (!(port_mask & (ATA_PORT_PRIMARY|ATA_PORT_SECONDARY)))
+ return NULL;
+
probe_ent = ata_probe_ent_alloc(pci_dev_to_dev(pdev), port[0]);
if (!probe_ent)
return NULL;
@@ -979,10 +985,10 @@ static struct ata_probe_ent *ata_pci_ini
int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
unsigned int n_ports)
{
- struct ata_probe_ent *probe_ent = NULL;
+ struct ata_probe_ent *probe_ent_legacy = NULL;
+ struct ata_probe_ent *probe_ent_native = NULL;
struct ata_port_info *port[2];
- u8 mask;
- unsigned int legacy_mode = 0;
+ unsigned int legacy_mode = 0, legacy_probe = 0, native_probe = 0;
int disable_dev_on_err = 1;
int rc;
@@ -1011,29 +1017,32 @@ int ata_pci_init_one (struct pci_dev *pd
if ((pdev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
u8 tmp8;
- /* TODO: What if one channel is in native mode ... */
pci_read_config_byte(pdev, PCI_CLASS_PROG, &tmp8);
- mask = (1 << 2) | (1 << 0);
- if ((tmp8 & mask) != mask)
- legacy_mode = (1 << 3);
+
+ if ((tmp8 & ATA_PORT_PRIMARY_LEGACY) == 0)
+ legacy_mode |= ATA_PORT_PRIMARY;
+ if ((tmp8 & ATA_PORT_SECONDARY_LEGACY) == 0)
+ legacy_mode |= ATA_PORT_SECONDARY;
+
#if defined(CONFIG_NO_ATA_LEGACY)
/* Some platforms with PCI limits cannot address compat
port space. In that case we punt if their firmware has
left a device in compatibility mode */
if (legacy_mode) {
- printk(KERN_ERR "ata: Compatibility mode ATA is not supported on this platform, skipping.\n");
+ printk(KERN_ERR "ata: Compatibility mode ATA is not " \
+ "supported on this platform, skipping.\n");
return -EOPNOTSUPP;
}
#endif
}
- rc = pci_request_regions(pdev, DRV_NAME);
+ rc = pci_request_region(pdev, 4, DRV_NAME);
if (rc) {
disable_dev_on_err = 0;
goto err_out;
}
- if (legacy_mode) {
+ if (legacy_mode & ATA_PORT_PRIMARY) {
if (!request_region(ATA_PRIMARY_CMD, 8, "libata")) {
struct resource *conflict, res;
res.start = ATA_PRIMARY_CMD;
@@ -1042,7 +1051,7 @@ #endif
while (conflict->child)
conflict = ____request_resource(conflict, &res);
if (!strcmp(conflict->name, "libata"))
- legacy_mode |= ATA_PORT_PRIMARY;
+ legacy_probe |= ATA_PORT_PRIMARY;
else {
disable_dev_on_err = 0;
printk(KERN_WARNING "ata: 0x%0X IDE port busy\n" \
@@ -1051,8 +1060,19 @@ #endif
conflict->name);
}
} else
- legacy_mode |= ATA_PORT_PRIMARY;
+ legacy_probe |= ATA_PORT_PRIMARY;
+ } else {
+ if (!pci_request_region(pdev, 0, DRV_NAME)) {
+ if (!pci_request_region(pdev, 1, DRV_NAME))
+ native_probe |= ATA_PORT_PRIMARY;
+ else {
+ disable_dev_on_err = 0;
+ pci_release_region(pdev, 0);
+ }
+ }
+ }
+ if (legacy_mode & ATA_PORT_SECONDARY) {
if (!request_region(ATA_SECONDARY_CMD, 8, "libata")) {
struct resource *conflict, res;
res.start = ATA_SECONDARY_CMD;
@@ -1061,7 +1081,7 @@ #endif
while (conflict->child)
conflict = ____request_resource(conflict, &res);
if (!strcmp(conflict->name, "libata"))
- legacy_mode |= ATA_PORT_SECONDARY;
+ legacy_probe |= ATA_PORT_SECONDARY;
else {
disable_dev_on_err = 0;
printk(KERN_WARNING "ata: 0x%X IDE port busy\n" \
@@ -1070,11 +1090,20 @@ #endif
conflict->name);
}
} else
- legacy_mode |= ATA_PORT_SECONDARY;
- }
+ legacy_probe |= ATA_PORT_SECONDARY;
+ } else if (n_ports > 1) {
+ if (!pci_request_region(pdev, 2, DRV_NAME)) {
+ if (!pci_request_region(pdev, 3, DRV_NAME))
+ native_probe = ATA_PORT_SECONDARY;
+ else {
+ disable_dev_on_err = 0;
+ pci_release_region(pdev, 2);
+ }
+ }
+ }
- /* we have legacy mode, but all ports are unavailable */
- if (legacy_mode == (1 << 3)) {
+ /* Didn't enable any ports */
+ if (!legacy_probe && !native_probe) {
rc = -EBUSY;
goto err_out_regions;
}
@@ -1087,38 +1116,58 @@ #endif
if (rc)
goto err_out_regions;
- if (legacy_mode) {
- probe_ent = ata_pci_init_legacy_port(pdev, port, legacy_mode);
- } else {
- if (n_ports == 2)
- probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
- else
- probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY);
- }
- if (!probe_ent) {
+ probe_ent_legacy = ata_pci_init_legacy_port(pdev, port, legacy_probe);
+ probe_ent_native = ata_pci_init_native_mode(pdev, port, native_probe);
+
+ if (!probe_ent_legacy && !probe_ent_native) {
rc = -ENOMEM;
goto err_out_regions;
}
pci_set_master(pdev);
- if (!ata_device_add(probe_ent)) {
+ if (probe_ent_legacy) {
+ if (!ata_device_add(probe_ent_legacy)) {
+ printk(KERN_WARNING "ata: Failed to add legacy device(s)\n");
+ kfree(probe_ent_legacy);
+ probe_ent_legacy = NULL;
+ }
+ }
+ if (probe_ent_native) {
+ if (!ata_device_add(probe_ent_native)) {
+ printk(KERN_WARNING "ata: Failed to add native device(s)\n");
+ kfree(probe_ent_native);
+ probe_ent_native = NULL;
+ }
+ }
+
+ /* Did both fail? If so, no devices to see here. */
+ if (!probe_ent_native && !probe_ent_legacy) {
rc = -ENODEV;
- goto err_out_ent;
+ goto err_out_regions;
}
- kfree(probe_ent);
+ kfree(probe_ent_legacy);
+ kfree(probe_ent_native);
return 0;
-err_out_ent:
- kfree(probe_ent);
err_out_regions:
- if (legacy_mode & ATA_PORT_PRIMARY)
+ if (legacy_probe & ATA_PORT_PRIMARY)
release_region(ATA_PRIMARY_CMD, 8);
- if (legacy_mode & ATA_PORT_SECONDARY)
+ else if (native_probe & ATA_PORT_PRIMARY) {
+ pci_release_region(pdev, 0);
+ pci_release_region(pdev, 1);
+ }
+
+ if (legacy_probe & ATA_PORT_SECONDARY)
release_region(ATA_SECONDARY_CMD, 8);
- pci_release_regions(pdev);
+ else if (native_probe & ATA_PORT_SECONDARY) {
+ pci_release_region(pdev, 2);
+ pci_release_region(pdev, 3);
+ }
+
+ pci_release_region(pdev, 4);
err_out:
if (disable_dev_on_err)
pci_disable_device(pdev);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index ab27548..1f0a200 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -260,6 +260,10 @@ enum {
ATA_PORT_PRIMARY = (1 << 0),
ATA_PORT_SECONDARY = (1 << 1),
+ /* masks for port legacy mode */
+ ATA_PORT_PRIMARY_LEGACY = (1 << 0),
+ ATA_PORT_SECONDARY_LEGACY = (1 << 2),
+
/* ering size */
ATA_ERING_SIZE = 32,
-
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