* Re: [PATCH] PCI: dwc: Restore ATU memory resource setup to use last entry
2020-10-26 15:48 [PATCH] PCI: dwc: Restore ATU memory resource setup to use last entry Rob Herring
@ 2020-10-26 16:22 ` Jingoo Han
2020-10-26 16:49 ` Vidya Sagar
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: Jingoo Han @ 2020-10-26 16:22 UTC (permalink / raw)
To: Rob Herring, linux-pci
Cc: Vidya Sagar, Gustavo Pimentel, Lorenzo Pieralisi, Bjorn Helgaas,
Han Jingoo
On 10/26/20, 11:48 AM, Rob Herring wrote:
>
> Prior to commit 0f71c60ffd26 ("PCI: dwc: Remove storing of PCI
> resources"), the DWC driver was setting up the last memory resource
> rather than the first memory resource. This doesn't matter for most
> platforms which only have 1 memory resource, but it broke Tegra194 which
> has a 2nd (prefetchable) memory region which requires an ATU entry. The
> first region on Tegra194 relies on the default 1:1 pass-thru of outbound
> transactions which doesn't need an ATU entry.
>
> Fixes: 0f71c60ffd26 ("PCI: dwc: Remove storing of PCI resources")
> Reported-by: Vidya Sagar <vidyas@nvidia.com>
> Cc: Jingoo Han <jingoohan1@gmail.com>
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Best regards,
Jingoo Han
> Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Signed-off-by: Rob Herring <robh@kernel.org>
> ---
> drivers/pci/controller/dwc/pcie-designware-host.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 674f32db85ca..44c2a6572199 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -586,8 +586,12 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
> * ATU, so we should not program the ATU here.
> */
> if (pp->bridge->child_ops == &dw_child_pcie_ops) {
> - struct resource_entry *entry =
> - resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM);
> + struct resource_entry *tmp, *entry = NULL;
> +
> + /* Get last memory resource entry */
> + resource_list_for_each_entry(tmp, &pp->bridge->windows)
> + if (resource_type(tmp->res) == IORESOURCE_MEM)
> + entry = tmp;
>
> dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX0,
> PCIE_ATU_TYPE_MEM, entry->res->start,
> --
> 2.25.1
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] PCI: dwc: Restore ATU memory resource setup to use last entry
2020-10-26 15:48 [PATCH] PCI: dwc: Restore ATU memory resource setup to use last entry Rob Herring
2020-10-26 16:22 ` Jingoo Han
@ 2020-10-26 16:49 ` Vidya Sagar
2020-10-26 18:02 ` Rob Herring
2020-11-03 16:24 ` Lorenzo Pieralisi
2020-11-03 19:30 ` Bjorn Helgaas
3 siblings, 1 reply; 6+ messages in thread
From: Vidya Sagar @ 2020-10-26 16:49 UTC (permalink / raw)
To: Rob Herring, linux-pci
Cc: Jingoo Han, Gustavo Pimentel, Lorenzo Pieralisi, Bjorn Helgaas
On 10/26/2020 9:18 PM, Rob Herring wrote:
> External email: Use caution opening links or attachments
>
>
> Prior to commit 0f71c60ffd26 ("PCI: dwc: Remove storing of PCI
> resources"), the DWC driver was setting up the last memory resource
> rather than the first memory resource. This doesn't matter for most
> platforms which only have 1 memory resource, but it broke Tegra194 which
> has a 2nd (prefetchable) memory region which requires an ATU entry. The
> first region on Tegra194 relies on the default 1:1 pass-thru of outbound
> transactions which doesn't need an ATU entry.
>
> Fixes: 0f71c60ffd26 ("PCI: dwc: Remove storing of PCI resources")
> Reported-by: Vidya Sagar <vidyas@nvidia.com>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Signed-off-by: Rob Herring <robh@kernel.org>
> ---
> drivers/pci/controller/dwc/pcie-designware-host.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 674f32db85ca..44c2a6572199 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -586,8 +586,12 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
> * ATU, so we should not program the ATU here.
> */
> if (pp->bridge->child_ops == &dw_child_pcie_ops) {
> - struct resource_entry *entry =
> - resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM);
> + struct resource_entry *tmp, *entry = NULL;
> +
> + /* Get last memory resource entry */
> + resource_list_for_each_entry(tmp, &pp->bridge->windows)
> + if (resource_type(tmp->res) == IORESOURCE_MEM)
> + entry = tmp;
This patch works for Tegra194 with its 'ranges' property in its current
shape. But, this still doesn't work if ATU mapping needs to be set for
both prefetchable and non-prefetchable regions. The series I pushed at
http://patchwork.ozlabs.org/project/linux-pci/list/?series=209764 works
for this condition as well.
When it comes to configuring the ATU to handle multiple memory apertures
(which is the ultimate goal), I think we need to understand the side
effects of removing I/O mapping in platforms where the number of view
ports available are not enough to have I/O mapping.
>
> dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX0,
> PCIE_ATU_TYPE_MEM, entry->res->start,
> --
> 2.25.1
>
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] PCI: dwc: Restore ATU memory resource setup to use last entry
2020-10-26 16:49 ` Vidya Sagar
@ 2020-10-26 18:02 ` Rob Herring
0 siblings, 0 replies; 6+ messages in thread
From: Rob Herring @ 2020-10-26 18:02 UTC (permalink / raw)
To: Vidya Sagar
Cc: PCI, Jingoo Han, Gustavo Pimentel, Lorenzo Pieralisi, Bjorn Helgaas
On Mon, Oct 26, 2020 at 11:49 AM Vidya Sagar <vidyas@nvidia.com> wrote:
>
>
>
> On 10/26/2020 9:18 PM, Rob Herring wrote:
> > External email: Use caution opening links or attachments
> >
> >
> > Prior to commit 0f71c60ffd26 ("PCI: dwc: Remove storing of PCI
> > resources"), the DWC driver was setting up the last memory resource
> > rather than the first memory resource. This doesn't matter for most
> > platforms which only have 1 memory resource, but it broke Tegra194 which
> > has a 2nd (prefetchable) memory region which requires an ATU entry. The
> > first region on Tegra194 relies on the default 1:1 pass-thru of outbound
> > transactions which doesn't need an ATU entry.
> >
> > Fixes: 0f71c60ffd26 ("PCI: dwc: Remove storing of PCI resources")
> > Reported-by: Vidya Sagar <vidyas@nvidia.com>
> > Cc: Jingoo Han <jingoohan1@gmail.com>
> > Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> > Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> > Cc: Bjorn Helgaas <bhelgaas@google.com>
> > Signed-off-by: Rob Herring <robh@kernel.org>
> > ---
> > drivers/pci/controller/dwc/pcie-designware-host.c | 8 ++++++--
> > 1 file changed, 6 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> > index 674f32db85ca..44c2a6572199 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> > @@ -586,8 +586,12 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
> > * ATU, so we should not program the ATU here.
> > */
> > if (pp->bridge->child_ops == &dw_child_pcie_ops) {
> > - struct resource_entry *entry =
> > - resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM);
> > + struct resource_entry *tmp, *entry = NULL;
> > +
> > + /* Get last memory resource entry */
> > + resource_list_for_each_entry(tmp, &pp->bridge->windows)
> > + if (resource_type(tmp->res) == IORESOURCE_MEM)
> > + entry = tmp;
> This patch works for Tegra194 with its 'ranges' property in its current
> shape. But, this still doesn't work if ATU mapping needs to be set for
> both prefetchable and non-prefetchable regions.
Supporting both is not a current feature and therefore not 5.10
material. This patch is intended for 5.10. Adding support for multiple
memory regions would be 5.11 material.
> The series I pushed at
> http://patchwork.ozlabs.org/project/linux-pci/list/?series=209764 works
> for this condition as well.
I have an alternative implementation that I'll send out shortly.
> When it comes to configuring the ATU to handle multiple memory apertures
> (which is the ultimate goal), I think we need to understand the side
> effects of removing I/O mapping in platforms where the number of view
> ports available are not enough to have I/O mapping.
We don't have that case upstream AFAICT. Tegra is the only platform
with more than 1 memory region which could cause a change in behavior.
In any case, I'm not removing the sharing of ATU for config and i/o
(though I think we should). I am adding a warning though.
Rob
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] PCI: dwc: Restore ATU memory resource setup to use last entry
2020-10-26 15:48 [PATCH] PCI: dwc: Restore ATU memory resource setup to use last entry Rob Herring
2020-10-26 16:22 ` Jingoo Han
2020-10-26 16:49 ` Vidya Sagar
@ 2020-11-03 16:24 ` Lorenzo Pieralisi
2020-11-03 19:30 ` Bjorn Helgaas
3 siblings, 0 replies; 6+ messages in thread
From: Lorenzo Pieralisi @ 2020-11-03 16:24 UTC (permalink / raw)
To: Rob Herring, Bjorn Helgaas
Cc: linux-pci, Vidya Sagar, Jingoo Han, Gustavo Pimentel
On Mon, Oct 26, 2020 at 10:48:52AM -0500, Rob Herring wrote:
> Prior to commit 0f71c60ffd26 ("PCI: dwc: Remove storing of PCI
> resources"), the DWC driver was setting up the last memory resource
> rather than the first memory resource. This doesn't matter for most
> platforms which only have 1 memory resource, but it broke Tegra194 which
> has a 2nd (prefetchable) memory region which requires an ATU entry. The
> first region on Tegra194 relies on the default 1:1 pass-thru of outbound
> transactions which doesn't need an ATU entry.
>
> Fixes: 0f71c60ffd26 ("PCI: dwc: Remove storing of PCI resources")
> Reported-by: Vidya Sagar <vidyas@nvidia.com>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Signed-off-by: Rob Herring <robh@kernel.org>
> ---
> drivers/pci/controller/dwc/pcie-designware-host.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
Bjorn, this is v5.10 material please pick it up for one of the
upcoming -rc*:
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 674f32db85ca..44c2a6572199 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -586,8 +586,12 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
> * ATU, so we should not program the ATU here.
> */
> if (pp->bridge->child_ops == &dw_child_pcie_ops) {
> - struct resource_entry *entry =
> - resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM);
> + struct resource_entry *tmp, *entry = NULL;
> +
> + /* Get last memory resource entry */
> + resource_list_for_each_entry(tmp, &pp->bridge->windows)
> + if (resource_type(tmp->res) == IORESOURCE_MEM)
> + entry = tmp;
>
> dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX0,
> PCIE_ATU_TYPE_MEM, entry->res->start,
> --
> 2.25.1
>
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] PCI: dwc: Restore ATU memory resource setup to use last entry
2020-10-26 15:48 [PATCH] PCI: dwc: Restore ATU memory resource setup to use last entry Rob Herring
` (2 preceding siblings ...)
2020-11-03 16:24 ` Lorenzo Pieralisi
@ 2020-11-03 19:30 ` Bjorn Helgaas
3 siblings, 0 replies; 6+ messages in thread
From: Bjorn Helgaas @ 2020-11-03 19:30 UTC (permalink / raw)
To: Rob Herring
Cc: linux-pci, Vidya Sagar, Jingoo Han, Gustavo Pimentel,
Lorenzo Pieralisi, Bjorn Helgaas
On Mon, Oct 26, 2020 at 10:48:52AM -0500, Rob Herring wrote:
> Prior to commit 0f71c60ffd26 ("PCI: dwc: Remove storing of PCI
> resources"), the DWC driver was setting up the last memory resource
> rather than the first memory resource. This doesn't matter for most
> platforms which only have 1 memory resource, but it broke Tegra194 which
> has a 2nd (prefetchable) memory region which requires an ATU entry. The
> first region on Tegra194 relies on the default 1:1 pass-thru of outbound
> transactions which doesn't need an ATU entry.
>
> Fixes: 0f71c60ffd26 ("PCI: dwc: Remove storing of PCI resources")
> Reported-by: Vidya Sagar <vidyas@nvidia.com>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Signed-off-by: Rob Herring <robh@kernel.org>
Applied with acks from Lorenzo and Jingoo to for-linus for v5.10,
thanks!
> ---
> drivers/pci/controller/dwc/pcie-designware-host.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 674f32db85ca..44c2a6572199 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -586,8 +586,12 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
> * ATU, so we should not program the ATU here.
> */
> if (pp->bridge->child_ops == &dw_child_pcie_ops) {
> - struct resource_entry *entry =
> - resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM);
> + struct resource_entry *tmp, *entry = NULL;
> +
> + /* Get last memory resource entry */
> + resource_list_for_each_entry(tmp, &pp->bridge->windows)
> + if (resource_type(tmp->res) == IORESOURCE_MEM)
> + entry = tmp;
>
> dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX0,
> PCIE_ATU_TYPE_MEM, entry->res->start,
> --
> 2.25.1
>
^ permalink raw reply [flat|nested] 6+ messages in thread