Re: [PATCH] PCI: Add sysfs attribute for disabling PCIe link to downstream component

Mika Westerberg
2019-08-21T14:37:57Z

On Wed, Aug 21, 2019 at 10:28:37AM +0300, Mika Westerberg wrote:
> > If we see a type of PCI_EXP_TYPE_ROOT_PORT or
> > PCI_EXP_TYPE_PCIE_BRIDGE, I think we have to assume that's accurate
> > (which we already do today -- for those types, we assume the device
> > has a secondary link).
> >
> > For a device that claims to be PCI_EXP_TYPE_DOWNSTREAM, if a parent
> > device exists and is a Downstream Port (Root Port, Switch Downstream
> > Port, and I suppose a PCI-to-PCIe bridge (this is basically
> > pcie_downstream_port()), this device must actually be acting as a
> > PCI_EXP_TYPE_UPSTREAM device.
> >
> > If a device claiming to be PCI_EXP_TYPE_UPSTREAM has a parent that is
> > PCI_EXP_TYPE_UPSTREAM, this device must actually be a
> > PCI_EXP_TYPE_DOWNSTREAM port.
> >
> > For PCI_EXP_TYPE_DOWNSTREAM and PCI_EXP_TYPE_UPSTREAM devices that
> > don't have parents, we just have to assume they advertise the correct
> > type (as we do today). There are sparc and virtualization configs
> > like this.
>
> OK, thanks for the details. I'll try to make patch based on the above.

Something like the below patch? Only compile tested for now but I will
split it into a proper patch series and give it some testing if this is
what you were after.

diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index 544922f097c0..2fccb5762c76 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -336,15 +336,6 @@ static inline int pcie_cap_version(const struct pci_dev *dev)
return pcie_caps_reg(dev) & PCI_EXP_FLAGS_VERS;
}

-static bool pcie_downstream_port(const struct pci_dev *dev)
-{
- int type = pci_pcie_type(dev);
-
- return type == PCI_EXP_TYPE_ROOT_PORT ||
- type == PCI_EXP_TYPE_DOWNSTREAM ||
- type == PCI_EXP_TYPE_PCIE_BRIDGE;
-}
-
bool pcie_cap_has_lnkctl(const struct pci_dev *dev)
{
int type = pci_pcie_type(dev);
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 9ac50710f1d4..3c0672f1dfe7 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -3577,7 +3577,7 @@ int pci_enable_atomic_ops_to_root(struct pci_dev *dev, u32 cap_mask)
}

/* Ensure upstream ports don't block AtomicOps on egress */
- if (!bridge->has_secondary_link) {
+ if (pci_pcie_type(bridge) == PCI_EXP_TYPE_UPSTREAM) {
pcie_capability_read_dword(bridge, PCI_EXP_DEVCTL2,
&ctl2);
if (ctl2 & PCI_EXP_DEVCTL2_ATOMIC_EGRESS_BLOCK)
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 9a83fcf612ca..ae8d839dca4f 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -118,6 +118,15 @@ static inline bool pci_power_manageable(struct pci_dev *pci_dev)
return !pci_has_subordinate(pci_dev) || pci_dev->bridge_d3;
}

+static inline bool pcie_downstream_port(const struct pci_dev *dev)
+{
+ int type = pci_pcie_type(dev);
+
+ return type == PCI_EXP_TYPE_ROOT_PORT ||
+ type == PCI_EXP_TYPE_DOWNSTREAM ||
+ type == PCI_EXP_TYPE_PCIE_BRIDGE;
+}
+
int pci_vpd_init(struct pci_dev *dev);
void pci_vpd_release(struct pci_dev *dev);
void pcie_vpd_create_sysfs_dev_files(struct pci_dev *dev);
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 464f8f92653f..db2d40e44c08 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -904,6 +904,7 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev)
{
struct pcie_link_state *link;
int blacklist = !!pcie_aspm_sanity_check(pdev);
+ int type = pci_pcie_type(pdev);

if (!aspm_support_enabled)
return;
@@ -913,15 +914,14 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev)

/*
* We allocate pcie_link_state for the component on the upstream
- * end of a Link, so there's nothing to do unless this device has a
- * Link on its secondary side.
+ * end of a Link, so there's nothing to do unless this device is
+ * downstream or root port.
*/
- if (!pdev->has_secondary_link)
+ if (type != PCI_EXP_TYPE_ROOT_PORT && type != PCI_EXP_TYPE_DOWNSTREAM)
return;

/* VIA has a strange chipset, root port is under a bridge */
- if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT &&
- pdev->bus->self)
+ if (type == PCI_EXP_TYPE_ROOT_PORT && pdev->bus->self)
return;

down_read(&pci_bus_sem);
@@ -1070,7 +1070,8 @@ static int __pci_disable_link_state(struct pci_dev *pdev, int state, bool sem)
if (!pci_is_pcie(pdev))
return 0;

- if (pdev->has_secondary_link)
+ if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT ||
+ pci_pcie_type(pdev) == PCI_EXP_TYPE_DOWNSTREAM)
parent = pdev;
if (!parent || !parent->link_state)
return -EINVAL;
diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index 773197a12568..b0e6048a9208 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -166,7 +166,7 @@ static pci_ers_result_t reset_link(struct pci_dev *dev, u32 service)
driver = pcie_port_find_service(dev, service);
if (driver && driver->reset_link) {
status = driver->reset_link(dev);
- } else if (dev->has_secondary_link) {
+ } else if (pcie_downstream_port(dev)) {
status = default_reset_link(dev);
} else {
pci_printk(KERN_DEBUG, dev, "no link-reset support at upstream device %s\n",
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index a3c7338fad86..983a5612c548 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1431,26 +1431,40 @@ void set_pcie_port_type(struct pci_dev *pdev)
pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, &reg16);
pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD;

+ parent = pci_upstream_bridge(pdev);
+ if (!parent)
+ return;
+
/*
- * A Root Port or a PCI-to-PCIe bridge is always the upstream end
- * of a Link. No PCIe component has two Links. Two Links are
- * connected by a Switch that has a Port on each Link and internal
- * logic to connect the two Ports.
+ * Some systems do not identify their upstream/downstream ports
+ * correctly so detect impossible configurations here and correct
+ * the port type accordingly.
*/
type = pci_pcie_type(pdev);
- if (type == PCI_EXP_TYPE_ROOT_PORT ||
- type == PCI_EXP_TYPE_PCIE_BRIDGE)
- pdev->has_secondary_link = 1;
- else if (type == PCI_EXP_TYPE_UPSTREAM ||
- type == PCI_EXP_TYPE_DOWNSTREAM) {
- parent = pci_upstream_bridge(pdev);
-
+ if (type == PCI_EXP_TYPE_DOWNSTREAM) {
/*
- * Usually there's an upstream device (Root Port or Switch
- * Downstream Port), but we can't assume one exists.
+ * If pdev claims to be downstream port but the parent
+ * device is also downstream port assume pdev is actually
+ * upstream port.
*/
- if (parent && !parent->has_secondary_link)
- pdev->has_secondary_link = 1;
+ if (pcie_downstream_port(parent)) {
+ dev_info(&pdev->dev,
+ "claims to be downstream port but is acting as upstream port, correcting type\n");
+ pdev->pcie_flags_reg &= ~PCI_EXP_FLAGS_TYPE;
+ pdev->pcie_flags_reg |= PCI_EXP_TYPE_UPSTREAM;
+ }
+ } else if (type == PCI_EXP_TYPE_UPSTREAM) {
+ /*
+ * If pdev claims to be upstream port but the parent
+ * device is also upstream port assume pdev is actually
+ * downstream port.
+ */
+ if (pci_pcie_type(parent) == PCI_EXP_TYPE_UPSTREAM) {
+ dev_info(&pdev->dev,
+ "claims to be upstream port but is acting as downstream port, correcting type\n");
+ pdev->pcie_flags_reg &= ~PCI_EXP_FLAGS_TYPE;
+ pdev->pcie_flags_reg |= PCI_EXP_TYPE_DOWNSTREAM;
+ }
}
}

@@ -2764,12 +2778,8 @@ static int only_one_child(struct pci_bus *bus)
* A PCIe Downstream Port normally leads to a Link with only Device
* 0 on it (PCIe spec r3.1, sec 7.3.1). As an optimization, scan
* only for Device 0 in that situation.
- *
- * Checking has_secondary_link is a hack to identify Downstream
- * Ports because sometimes Switches are configured such that the
- * PCIe Port Type labels are backwards.
*/
- if (bridge && pci_is_pcie(bridge) && bridge->has_secondary_link)
+ if (bridge && pci_is_pcie(bridge) && pcie_downstream_port(bridge))
return 1;

return 0;
diff --git a/drivers/pci/vc.c b/drivers/pci/vc.c
index 5acd9c02683a..9ae9fb9339e8 100644
--- a/drivers/pci/vc.c
+++ b/drivers/pci/vc.c
@@ -13,6 +13,8 @@
#include <linux/pci_regs.h>
#include <linux/types.h>

+#include "pci.h"
+
/**
* pci_vc_save_restore_dwords - Save or restore a series of dwords
* @dev: device
@@ -105,7 +107,7 @@ static void pci_vc_enable(struct pci_dev *dev, int pos, int res)
struct pci_dev *link = NULL;

/* Enable VCs from the downstream device */
- if (!dev->has_secondary_link)
+ if (!pci_is_pcie(dev) || !pcie_downstream_port(dev))
return;

ctrl_pos = pos + PCI_VC_RES_CTRL + (res * PCI_CAP_VC_PER_VC_SIZEOF);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 82e4cd1b7ac3..2f8990246316 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -418,7 +418,6 @@ struct pci_dev {
unsigned int broken_intx_masking:1; /* INTx masking can't be used */
unsigned int io_window_1k:1; /* Intel bridge 1K I/O windows */
unsigned int irq_managed:1;
- unsigned int has_secondary_link:1;
unsigned int non_compliant_bars:1; /* Broken BARs; ignore them */
unsigned int is_probed:1; /* Device probing in progress */
unsigned int link_active_reporting:1;/* Device capable of reporting link active */