linux-kernel - Re: SATA resume slowness, e1000 MSI warning

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Message-ID: <20070308102354.GC5149@mellanox.co.il>
Date:	Thu, 8 Mar 2007 12:23:54 +0200
From:	"Michael S. Tsirkin" <mst@...lanox.co.il>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Kok, Auke" <auke-jan.h.kok@...el.com>,
	Ingo Molnar <mingo@...e.hu>, Jeff Garzik <jeff@...zik.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>,
	Jens Axboe <jens.axboe@...cle.com>,
	Adrian Bunk <bunk@...sta.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>, linux-pm@...ts.osdl.org,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Subject: Re: SATA resume slowness, e1000 MSI warning

> The only case I can see which might trigger this is if we saved
> pci-X state and then didn't restore it because we could not find
> the capability on restore.

Hmm. pci_save_pcix_state/pci_restore_pcix_state seem to only handle
regular devices and seem to ignore the fact that for bridge PCI-X
capability has a different structure.

Is this intentional? If not, here's a patch to fix this.
Warning: completely untested.


PCI: restore bridge PCI-X capability registers after PM event

Restore PCI-X bridge up/downstream capability registers
after PM event.  This includes maxumum split transaction
commitment limit which might be vital for PCI X.

Signed-off-by: Michael S. Tsirkin <mst@...lanox.co.il>

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index df49530..4b788ef 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -597,14 +597,19 @@ static int pci_save_pcix_state(struct pci_dev *dev)
 	if (pos <= 0)
 		return 0;
 
-	save_state = kzalloc(sizeof(*save_state) + sizeof(u16), GFP_KERNEL);
+	save_state = kzalloc(sizeof(*save_state) + sizeof(u16) * 2, GFP_KERNEL);
 	if (!save_state) {
-		dev_err(&dev->dev, "Out of memory in pci_save_pcie_state\n");
+		dev_err(&dev->dev, "Out of memory in pci_save_pcix_state\n");
 		return -ENOMEM;
 	}
 	cap = (u16 *)&save_state->data[0];
 
-	pci_read_config_word(dev, pos + PCI_X_CMD, &cap[i++]);
+	if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
+		pci_read_config_word(dev, pos + PCI_X_BRIDGE_UP_SPL_CTL, &cap[i++]);
+		pci_read_config_word(dev, pos + PCI_X_BRIDGE_DN_SPL_CTL, &cap[i++]);
+	} else
+		pci_read_config_word(dev, pos + PCI_X_CMD, &cap[i++]);
+
 	pci_add_saved_cap(dev, save_state);
 	return 0;
 }
@@ -621,7 +626,11 @@ static void pci_restore_pcix_state(struct pci_dev *dev)
 		return;
 	cap = (u16 *)&save_state->data[0];
 
-	pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]);
+	if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
+		pci_write_config_word(dev, pos + PCI_X_BRIDGE_UP_SPL_CTL, cap[i++]);
+		pci_write_config_word(dev, pos + PCI_X_BRIDGE_DN_SPL_CTL, cap[i++]);
+	} else
+		pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]);
 	pci_remove_saved_cap(save_state);
 	kfree(save_state);
 }
diff --git a/include/linux/pci_regs.h b/include/linux/pci_regs.h
index f09cce2..fb7eefd 100644
--- a/include/linux/pci_regs.h
+++ b/include/linux/pci_regs.h
@@ -332,6 +332,8 @@
 #define  PCI_X_STATUS_SPL_ERR	0x20000000	/* Rcvd Split Completion Error Msg */
 #define  PCI_X_STATUS_266MHZ	0x40000000	/* 266 MHz capable */
 #define  PCI_X_STATUS_533MHZ	0x80000000	/* 533 MHz capable */
+#define PCI_X_BRIDGE_UP_SPL_CTL 10	/* PCI-X upstream split transaction limit */
+#define PCI_X_BRIDGE_DN_SPL_CTL 14	/* PCI-X downstream split transaction limit */
 
 /* PCI Express capability registers */
 


-- 
MST
-
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