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Message-ID: <20070123211917.GA22109@dreamland.darkstar.lan>
Date: Tue, 23 Jan 2007 22:19:17 +0100
From: Luca Tettamanti <kronos.it@...il.com>
To: Stephen Hemminger <shemminger@...ux-foundation.org>
Cc: Luca Tettamanti <kronos.it@...il.com>,
Jay Cliburn <jacliburn@...lsouth.net>,
Randy Dunlap <randy.dunlap@...cle.com>, jeff@...zik.org,
shemminger@...l.org, csnook@...hat.com, hch@...radead.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
atl1-devel@...ts.sourceforge.net
Subject: Re: [PATCH 4/4] atl1: Ancillary C files for Attansic L1 driver
Il Tue, Jan 23, 2007 at 11:25:22AM -0800, Stephen Hemminger ha scritto:
> On Mon, 22 Jan 2007 21:00:04 +0100
> Luca Tettamanti <kronos.it@...il.com> wrote:
>
> > Il Sun, Jan 21, 2007 at 09:33:39PM -0600, Jay Cliburn ha scritto:
> > > Randy Dunlap wrote:
> > > >On Sun, 21 Jan 2007 15:07:37 -0600 Jay Cliburn wrote:
> > > [snip]
> > > >>+
> > > >>+int enable_msi;
> > > >>+module_param(enable_msi, int, 0444);
> > > >>+MODULE_PARM_DESC(enable_msi, "Enable PCI MSI");
> > > >
> > > >Hm, I thought that we didn't want individual drivers having MSI config
> > > >options...
> > >
> > > Luca? This one was yours IIRC. Care to chime in?
> >
> > I remember that discussion, but since there's no sistem-wide MSI
> > blacklist (or whitelist) I don't think it's safe to enable it
> > unconditionally. Judging from bug reports on lkml it's not safe to
> > assume that MSI support is sane on non-Intel chipsets.
> >
> > Luca
>
> There is MSI blacklisting see drivers/pci/quirks.c code.
> But the blacklist isn't complete enough yet.
>
> IMHO the MSI disabling should be removed from drivers and be done
> in the PCI core. But it doesn't seem to have gotten widespread
> support.
Does the INTx madness (like this one:
http://marc.theaimsgroup.com/?l=linux-kernel&m=116668921431574&w=2
) affect also PCI-E INTx emulation?
Anyway...
Unconditionally enable MSI in atl1 driver. Also remove some useless
#ifdef since pci_{en,dis}able_msi() are no-op when MSI support is not
configured in.
Signed-off-by: Luca Tettamanti <kronos.it@...il.com>
---
Patch against current netdev tree.
drivers/net/atl1/atl1.h | 1 -
drivers/net/atl1/atl1_main.c | 22 +++++++---------------
drivers/net/atl1/atl1_param.c | 13 -------------
3 files changed, 7 insertions(+), 29 deletions(-)
diff --git a/drivers/net/atl1/atl1.h b/drivers/net/atl1/atl1.h
index 1d13e8f..0b30e1c 100644
--- a/drivers/net/atl1/atl1.h
+++ b/drivers/net/atl1/atl1.h
@@ -281,7 +281,6 @@ struct atl1_adapter {
struct atl1_smb smb;
struct atl1_cmb cmb;
- int enable_msi;
u32 pci_state[16];
};
diff --git a/drivers/net/atl1/atl1_main.c b/drivers/net/atl1/atl1_main.c
index c0b1555..68e6cd1 100644
--- a/drivers/net/atl1/atl1_main.c
+++ b/drivers/net/atl1/atl1_main.c
@@ -1793,18 +1793,12 @@ s32 atl1_up(struct atl1_adapter *adapter)
goto err_up;
}
-#ifdef CONFIG_PCI_MSI
- if (adapter->enable_msi) {
- err = pci_enable_msi(adapter->pdev);
- if (err) {
- dev_info(&adapter->pdev->dev, "Unable to enable MSI: %d\n", err);
- adapter->enable_msi = 0;
- }
- }
-#endif
- if (!adapter->enable_msi)
+ err = pci_enable_msi(adapter->pdev);
+ if (err) {
+ dev_info(&adapter->pdev->dev, "Unable to enable MSI: %d\n", err);
irq_flags |= IRQF_SHARED;
-
+ }
+
err = request_irq(adapter->pdev->irq, &atl1_intr, irq_flags,
netdev->name, netdev);
if (unlikely(err))
@@ -1821,6 +1815,7 @@ s32 atl1_up(struct atl1_adapter *adapter)
free_irq(adapter->pdev->irq, netdev);
err_up:
+ pci_disable_msi(adapter->pdev);
/* free rx_buffers */
atl1_clean_rx_ring(adapter);
return err;
@@ -1836,10 +1831,7 @@ void atl1_down(struct atl1_adapter *adapter)
atl1_irq_disable(adapter);
free_irq(adapter->pdev->irq, netdev);
-#ifdef CONFIG_PCI_MSI
- if (adapter->enable_msi)
- pci_disable_msi(adapter->pdev);
-#endif
+ pci_disable_msi(adapter->pdev);
atl1_reset_hw(&adapter->hw);
adapter->cmb.cmb->int_stats = 0;
diff --git a/drivers/net/atl1/atl1_param.c b/drivers/net/atl1/atl1_param.c
index 4732f43..caa2d83 100644
--- a/drivers/net/atl1/atl1_param.c
+++ b/drivers/net/atl1/atl1_param.c
@@ -68,10 +68,6 @@ static int num_flash_vendor = 0;
module_param_array_named(flash_vendor, flash_vendor, int, &num_flash_vendor, 0);
MODULE_PARM_DESC(flash_vendor, "SPI flash vendor");
-int enable_msi;
-module_param(enable_msi, int, 0444);
-MODULE_PARM_DESC(enable_msi, "Enable PCI MSI");
-
#define DEFAULT_INT_MOD_CNT 100 /* 200us */
#define MAX_INT_MOD_CNT 65000
#define MIN_INT_MOD_CNT 50
@@ -211,13 +207,4 @@ void __devinit atl1_check_options(struct atl1_adapter *adapter)
adapter->hw.flash_vendor = (u8) (opt.def);
}
}
-
- { /* PCI MSI usage */
-
-#ifdef CONFIG_PCI_MSI
- adapter->enable_msi = enable_msi;
-#else
- adapter->enable_msi = 0;
-#endif
- }
}
Luca
--
Inquietudine sintetica
Solo, davanti all'ignoto
Tienimi stretto a te
-
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