| Message ID | 20190821153545.17635-3-jonnyc@amazon.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | Amazon's Annapurna Labs DT-based PCIe host controller driver | expand |
On Wed, Aug 21, 2019 at 06:35:42PM +0300, Jonathan Chocron wrote: > From: Ali Saidi <alisaidi@amazon.com> > > The Amazon's Annapurna Labs root ports don't advertise an ACS > capability, but they don't allow peer-to-peer transactions and do > validate bus numbers through the SMMU. Additionally, it's not possible > for one RP to pass traffic to another RP. > > Signed-off-by: Ali Saidi <alisaidi@amazon.com> > Signed-off-by: Jonathan Chocron <jonnyc@amazon.com> > Reviewed-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com> > --- > drivers/pci/quirks.c | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c > index 208aacf39329..23672680dba7 100644 > --- a/drivers/pci/quirks.c > +++ b/drivers/pci/quirks.c > @@ -4366,6 +4366,23 @@ static int pci_quirk_qcom_rp_acs(struct pci_dev *dev, u16 acs_flags) > return ret; > } > > +static int pci_quirk_al_acs(struct pci_dev *dev, u16 acs_flags) > +{ > + /* > + * Amazon's Annapurna Labs root ports don't include an ACS capability, > + * but do include ACS-like functionality. The hardware doesn't support > + * peer-to-peer transactions via the root port and each has a unique > + * segment number. > + * Additionally, the root ports cannot send traffic to each other. Nit: I'd probably put a new line between the above two lines, or start the 'Additionally' sentence on the first line. But either way... Reviewed-by: Andrew Murray <andrew.murray@arm.com> > + */ > + acs_flags &= ~(PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_SV | PCI_ACS_UF); > + > + if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) > + return -ENOTTY; > + > + return acs_flags ? 0 : 1; > +} > + > /* > * Sunrise Point PCH root ports implement ACS, but unfortunately as shown in > * the datasheet (Intel 100 Series Chipset Family PCH Datasheet, Vol. 2, > @@ -4559,6 +4576,8 @@ static const struct pci_dev_acs_enabled { > { PCI_VENDOR_ID_AMPERE, 0xE00A, pci_quirk_xgene_acs }, > { PCI_VENDOR_ID_AMPERE, 0xE00B, pci_quirk_xgene_acs }, > { PCI_VENDOR_ID_AMPERE, 0xE00C, pci_quirk_xgene_acs }, > + /* Amazon Annapurna Labs */ > + { PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031, pci_quirk_al_acs }, > { 0 } > }; > > -- > 2.17.1 >
On Thu, 2019-08-22 at 09:31 +0100, Andrew Murray wrote: > On Wed, Aug 21, 2019 at 06:35:42PM +0300, Jonathan Chocron wrote: > > From: Ali Saidi <alisaidi@amazon.com> > > > > The Amazon's Annapurna Labs root ports don't advertise an ACS > > capability, but they don't allow peer-to-peer transactions and do > > validate bus numbers through the SMMU. Additionally, it's not > > possible > > for one RP to pass traffic to another RP. > > > > Signed-off-by: Ali Saidi <alisaidi@amazon.com> > > Signed-off-by: Jonathan Chocron <jonnyc@amazon.com> > > Reviewed-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com> > > --- > > drivers/pci/quirks.c | 19 +++++++++++++++++++ > > 1 file changed, 19 insertions(+) > > > > diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c > > index 208aacf39329..23672680dba7 100644 > > --- a/drivers/pci/quirks.c > > +++ b/drivers/pci/quirks.c > > @@ -4366,6 +4366,23 @@ static int pci_quirk_qcom_rp_acs(struct > > pci_dev *dev, u16 acs_flags) > > return ret; > > } > > > > +static int pci_quirk_al_acs(struct pci_dev *dev, u16 acs_flags) > > +{ > > + /* > > + * Amazon's Annapurna Labs root ports don't include an ACS > > capability, > > + * but do include ACS-like functionality. The hardware doesn't > > support > > + * peer-to-peer transactions via the root port and each has a > > unique > > + * segment number. > > + * Additionally, the root ports cannot send traffic to each > > other. > > Nit: I'd probably put a new line between the above two lines, or > start the > 'Additionally' sentence on the first line. But either way... > Added a newline. > Reviewed-by: Andrew Murray <andrew.murray@arm.com> > > > > + */ > > + acs_flags &= ~(PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_SV | > > PCI_ACS_UF); > > + > > + if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) > > + return -ENOTTY; > > + > > + return acs_flags ? 0 : 1; > > +} > > + > > /* > > * Sunrise Point PCH root ports implement ACS, but unfortunately > > as shown in > > * the datasheet (Intel 100 Series Chipset Family PCH Datasheet, > > Vol. 2, > > @@ -4559,6 +4576,8 @@ static const struct pci_dev_acs_enabled { > > { PCI_VENDOR_ID_AMPERE, 0xE00A, pci_quirk_xgene_acs }, > > { PCI_VENDOR_ID_AMPERE, 0xE00B, pci_quirk_xgene_acs }, > > { PCI_VENDOR_ID_AMPERE, 0xE00C, pci_quirk_xgene_acs }, > > + /* Amazon Annapurna Labs */ > > + { PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031, pci_quirk_al_acs > > }, > > { 0 } > > }; > > > > -- > > 2.17.1 > >
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 208aacf39329..23672680dba7 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -4366,6 +4366,23 @@ static int pci_quirk_qcom_rp_acs(struct pci_dev *dev, u16 acs_flags) return ret; } +static int pci_quirk_al_acs(struct pci_dev *dev, u16 acs_flags) +{ + /* + * Amazon's Annapurna Labs root ports don't include an ACS capability, + * but do include ACS-like functionality. The hardware doesn't support + * peer-to-peer transactions via the root port and each has a unique + * segment number. + * Additionally, the root ports cannot send traffic to each other. + */ + acs_flags &= ~(PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_SV | PCI_ACS_UF); + + if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) + return -ENOTTY; + + return acs_flags ? 0 : 1; +} + /* * Sunrise Point PCH root ports implement ACS, but unfortunately as shown in * the datasheet (Intel 100 Series Chipset Family PCH Datasheet, Vol. 2, @@ -4559,6 +4576,8 @@ static const struct pci_dev_acs_enabled { { PCI_VENDOR_ID_AMPERE, 0xE00A, pci_quirk_xgene_acs }, { PCI_VENDOR_ID_AMPERE, 0xE00B, pci_quirk_xgene_acs }, { PCI_VENDOR_ID_AMPERE, 0xE00C, pci_quirk_xgene_acs }, + /* Amazon Annapurna Labs */ + { PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031, pci_quirk_al_acs }, { 0 } };