| Message ID | 1412210019.4285.251.camel@pasglop (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Wed, Oct 1, 2014 at 8:33 PM, Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote: > A number of radeon cards have a HW limitation causing them to be > unable to generate the full 64-bit of address bits for MSIs. This > breaks MSIs on some platforms such as POWER machines. > > We used to have a powerpc specific quirk to address that on a > single card, but this doesn't scale very well, this is better > put under control of the drivers who know precisely what a given > HW revision can do. > > This moves the setting of the quirk flag to the radeon driver > > Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> > CC: <stable@vger.kernel.org> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> > --- > > v2: This is just adjusted to the new flag name > > arch/powerpc/kernel/pci_64.c | 1 - > drivers/gpu/drm/radeon/radeon_irq_kms.c | 10 ++++++++++ > 2 files changed, 10 insertions(+), 1 deletion(-) > > diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c > index d41a831..5330f6d 100644 > --- a/arch/powerpc/kernel/pci_64.c > +++ b/arch/powerpc/kernel/pci_64.c > @@ -271,5 +271,4 @@ static void quirk_radeon_32bit_msi(struct pci_dev *dev) > { > dev->no_64bit_msi = true; > } > -DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x68f2, quirk_radeon_32bit_msi); > DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0xaa68, quirk_radeon_32bit_msi); > diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c > index 16807af..e760671 100644 > --- a/drivers/gpu/drm/radeon/radeon_irq_kms.c > +++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c > @@ -202,6 +202,16 @@ static bool radeon_msi_ok(struct radeon_device *rdev) > if (rdev->flags & RADEON_IS_AGP) > return false; > > + /* > + * Older chips have a HW limitation, they can only generate 40 bits > + * of address for "64-bit" MSIs which breaks on some platforms, notably > + * IBM POWER servers, so we limit them > + */ > + if (rdev->family < CHIP_BONAIRE) { > + dev_info(rdev->dev, "radeon: MSI limited to 32-bit\n"); > + rdev->pdev->no_64bit_msi = true; > + } > + > /* force MSI on */ > if (radeon_msi == 1) > return true; > > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c index d41a831..5330f6d 100644 --- a/arch/powerpc/kernel/pci_64.c +++ b/arch/powerpc/kernel/pci_64.c @@ -271,5 +271,4 @@ static void quirk_radeon_32bit_msi(struct pci_dev *dev) { dev->no_64bit_msi = true; } -DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x68f2, quirk_radeon_32bit_msi); DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0xaa68, quirk_radeon_32bit_msi); diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c index 16807af..e760671 100644 --- a/drivers/gpu/drm/radeon/radeon_irq_kms.c +++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c @@ -202,6 +202,16 @@ static bool radeon_msi_ok(struct radeon_device *rdev) if (rdev->flags & RADEON_IS_AGP) return false; + /* + * Older chips have a HW limitation, they can only generate 40 bits + * of address for "64-bit" MSIs which breaks on some platforms, notably + * IBM POWER servers, so we limit them + */ + if (rdev->family < CHIP_BONAIRE) { + dev_info(rdev->dev, "radeon: MSI limited to 32-bit\n"); + rdev->pdev->no_64bit_msi = true; + } + /* force MSI on */ if (radeon_msi == 1) return true;
A number of radeon cards have a HW limitation causing them to be unable to generate the full 64-bit of address bits for MSIs. This breaks MSIs on some platforms such as POWER machines. We used to have a powerpc specific quirk to address that on a single card, but this doesn't scale very well, this is better put under control of the drivers who know precisely what a given HW revision can do. This moves the setting of the quirk flag to the radeon driver Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> CC: <stable@vger.kernel.org> --- v2: This is just adjusted to the new flag name arch/powerpc/kernel/pci_64.c | 1 - drivers/gpu/drm/radeon/radeon_irq_kms.c | 10 ++++++++++ 2 files changed, 10 insertions(+), 1 deletion(-) -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html