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Subject[PATCH v5 00/14] Report PCI device link status
From
Date
This is mostly Tal's work to reduce code duplication in drivers and unify
the approach for reporting PCIe link speed/width and whether the device is
being limited by a slower upstream link.

This v5 series is based on Tal's v4 [1].

Changes since v4:
- Added patches to replace uses of pcie_get_minimum_link() in bnx2x,
bnxt_en, cxgb4, fm10k, and ixgbe. Note that this is a user-visible
change to the log messages, and in some cases changes dev_warn() to
dev_info(). I hope we can converge on something that works for
everybody, and it's OK if we need to tweak the text and/or level used
in pcie_print_link_status() to get there.

- Rebased on top of Jay Fang's patch that adds 16 GT/s decoding support.

- Changed pcie_get_speed_cap() and pcie_get_width_cap() to return the
values directly instead of returning both an error code and the value
via a reference parameter. I don't think the callers can really use
both the error and the value.

- Moved some declarations from linux/pci.h to drivers/pci/pci.h so
they're not visible outside the PCI subsystem. Also removed
corresponding EXPORT_SYMBOL()s. If we need these outside the PCI core,
we can export them again, but that's not needed yet.

- Reworked pcie_bandwidth_available() so it finds the uppermost limiting
device and returns width/speed info for that device (previously it
could return width from one device and speed from a different one).

The incremental diff between the v4 series (based on v4.17-rc1) and this v5
series (based on v4.17-rc1 + Jay Fang's patch) is attached. This diff
doesn't include the new patches to bnx2x, bnxt_en, cxgb4, fm10k, and ixgbe.

I don't have any of this hardware, so this is only compile-tested.

Bjorn


[1] https://lkml.kernel.org/r/1522394086-3555-1-git-send-email-talgi@mellanox.com

---

Bjorn Helgaas (6):
bnx2x: Report PCIe link properties with pcie_print_link_status()
bnxt_en: Report PCIe link properties with pcie_print_link_status()
cxgb4: Report PCIe link properties with pcie_print_link_status()
fm10k: Report PCIe link properties with pcie_print_link_status()
ixgbe: Report PCIe link properties with pcie_print_link_status()
PCI: Remove unused pcie_get_minimum_link()

Tal Gilboa (8):
PCI: Add pcie_get_speed_cap() to find max supported link speed
PCI: Add pcie_get_width_cap() to find max supported link width
PCI: Add pcie_bandwidth_capable() to compute max supported link bandwidth
PCI: Add pcie_bandwidth_available() to compute bandwidth available to device
PCI: Add pcie_print_link_status() to log link speed and whether it's limited
net/mlx4_core: Report PCIe link properties with pcie_print_link_status()
net/mlx5: Report PCIe link properties with pcie_print_link_status()
net/mlx5e: Use pcie_bandwidth_available() to compute bandwidth


drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c | 23 +--
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 19 --
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c | 75 ---------
drivers/net/ethernet/intel/fm10k/fm10k_pci.c | 87 -----------
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 47 ------
drivers/net/ethernet/mellanox/mlx4/main.c | 81 ----------
drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 32 ----
drivers/net/ethernet/mellanox/mlx5/core/main.c | 4 +
drivers/pci/pci-sysfs.c | 38 +----
drivers/pci/pci.c | 167 ++++++++++++++++++---
drivers/pci/pci.h | 20 +++
include/linux/pci.h | 6 +
12 files changed, 189 insertions(+), 410 deletions(-)



diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 1bbd6cd20213..93291ec4a3d1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -3864,25 +3864,6 @@ void mlx5e_build_default_indir_rqt(u32 *indirection_rqt, int len,
indirection_rqt[i] = i % num_channels;
}

-static int mlx5e_get_pci_bw(struct mlx5_core_dev *mdev, u32 *pci_bw)
-{
- enum pcie_link_width width;
- enum pci_bus_speed speed;
- int err = 0;
- int bw;
-
- err = pcie_bandwidth_available(mdev->pdev, &speed, &width, &bw, NULL);
- if (err)
- return err;
-
- if (speed == PCI_SPEED_UNKNOWN || width == PCIE_LNK_WIDTH_UNKNOWN)
- return -EINVAL;
-
- *pci_bw = bw;
-
- return 0;
-}
-
static bool cqe_compress_heuristic(u32 link_speed, u32 pci_bw)
{
return (link_speed && pci_bw &&
@@ -3968,7 +3949,7 @@ void mlx5e_build_nic_params(struct mlx5_core_dev *mdev,
params->num_tc = 1;

mlx5e_get_max_linkspeed(mdev, &link_speed);
- mlx5e_get_pci_bw(mdev, &pci_bw);
+ pci_bw = pcie_bandwidth_available(mdev->pdev, NULL, NULL, NULL);
mlx5_core_dbg(mdev, "Max link speed = %d, PCI BW = %d\n",
link_speed, pci_bw);

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index f4b88674f029..63d0952684fb 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -158,33 +158,18 @@ static DEVICE_ATTR_RO(resource);
static ssize_t max_link_speed_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct pci_dev *pci_dev = to_pci_dev(dev);
- enum pci_bus_speed speed;
- const char *speed_str;
- int err;
-
- err = pcie_get_speed_cap(pci_dev, &speed);
- if (err)
- return -EINVAL;
-
- speed_str = PCIE_SPEED2STR(speed);
+ struct pci_dev *pdev = to_pci_dev(dev);

- return sprintf(buf, "%s\n", speed_str);
+ return sprintf(buf, "%s\n", PCIE_SPEED2STR(pcie_get_speed_cap(pdev)));
}
static DEVICE_ATTR_RO(max_link_speed);

static ssize_t max_link_width_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct pci_dev *pci_dev = to_pci_dev(dev);
- enum pcie_link_width width;
- int err;
-
- err = pcie_get_width_cap(pci_dev, &width);
- if (err)
- return -EINVAL;
+ struct pci_dev *pdev = to_pci_dev(dev);

- return sprintf(buf, "%u\n", width);
+ return sprintf(buf, "%u\n", pcie_get_width_cap(pdev));
}
static DEVICE_ATTR_RO(max_link_width);

@@ -201,6 +186,9 @@ static ssize_t current_link_speed_show(struct device *dev,
return -EINVAL;

switch (linkstat & PCI_EXP_LNKSTA_CLS) {
+ case PCI_EXP_LNKSTA_CLS_16_0GB:
+ speed = "16 GT/s";
+ break;
case PCI_EXP_LNKSTA_CLS_8_0GB:
speed = "8 GT/s";
break;
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index bd8aa64d083a..b6951c44ae6c 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -5103,193 +5103,169 @@ int pcie_set_mps(struct pci_dev *dev, int mps)
}
EXPORT_SYMBOL(pcie_set_mps);

-/**
- * pcie_get_minimum_link - determine minimum link settings of a PCI device
- * @dev: PCI device to query
- * @speed: storage for minimum speed
- * @width: storage for minimum width
- *
- * This function use pcie_bandwidth_available() for determining the minimum
- * link width and speed of the device. Legacy code is kept for compatibility.
- */
-int pcie_get_minimum_link(struct pci_dev *dev, enum pci_bus_speed *speed,
- enum pcie_link_width *width)
-{
- int bw;
-
- return pcie_bandwidth_available(dev, speed, width, &bw, NULL);
-}
-EXPORT_SYMBOL(pcie_get_minimum_link);
-
/**
* pcie_bandwidth_available - determine minimum link settings of a PCIe
- device and its bandwidth limitation
+ * device and its bandwidth limitation
* @dev: PCI device to query
- * @speed: storage for minimum speed
- * @width: storage for minimum width
- * @bw: storage for link bandwidth
* @limiting_dev: storage for device causing the bandwidth limitation
+ * @speed: storage for speed of limiting device
+ * @width: storage for width of limiting device
*
- * This function walks up the PCI device chain and determines the minimum width,
- * minimum speed and available bandwidth of the device.
+ * Walk up the PCI device chain and find the point where the minimum
+ * bandwidth is available. Return the bandwidth available there and (if
+ * limiting_dev, speed, and width pointers are supplied) information about
+ * that point.
*/
-int pcie_bandwidth_available(struct pci_dev *dev, enum pci_bus_speed *speed,
- enum pcie_link_width *width, int *bw,
- struct pci_dev **limiting_dev)
+u32 pcie_bandwidth_available(struct pci_dev *dev, struct pci_dev **limiting_dev,
+ enum pci_bus_speed *speed,
+ enum pcie_link_width *width)
{
- int err;
+ u16 lnksta;
+ enum pci_bus_speed next_speed;
+ enum pcie_link_width next_width;
+ u32 bw, next_bw;

*speed = PCI_SPEED_UNKNOWN;
*width = PCIE_LNK_WIDTH_UNKNOWN;
- *bw = 0;
+ bw = 0;

while (dev) {
- u16 lnksta;
- enum pci_bus_speed next_speed;
- enum pcie_link_width next_width;
-
- err = pcie_capability_read_word(dev, PCI_EXP_LNKSTA, &lnksta);
- if (err)
- return err;
+ pcie_capability_read_word(dev, PCI_EXP_LNKSTA, &lnksta);

next_speed = pcie_link_speed[lnksta & PCI_EXP_LNKSTA_CLS];
next_width = (lnksta & PCI_EXP_LNKSTA_NLW) >>
PCI_EXP_LNKSTA_NLW_SHIFT;

- if (next_speed < *speed)
- *speed = next_speed;
-
- if (next_width < *width)
- *width = next_width;
+ next_bw = next_width * PCIE_SPEED2MBS_ENC(next_speed);

/* Check if current device limits the total bandwidth */
- if (!(*bw) ||
- (*bw > next_width * PCIE_SPEED2MBS_ENC(next_speed))) {
+ if (!bw || next_bw <= bw) {
+ bw = next_bw;
+
if (limiting_dev)
*limiting_dev = dev;
- *bw = next_width * PCIE_SPEED2MBS_ENC(next_speed);
+ if (speed)
+ *speed = next_speed;
+ if (width)
+ *width = next_width;
}

- dev = dev->bus->self;
+ dev = pci_upstream_bridge(dev);
}

- return 0;
+ return bw;
}
EXPORT_SYMBOL(pcie_bandwidth_available);

/**
- * pcie_get_speed_cap - queries for the PCI device's link speed capability
+ * pcie_get_speed_cap - query for the PCI device's link speed capability
* @dev: PCI device to query
- * @speed: storage for link speed
*
- * This function queries the PCI device speed capability.
+ * Query the PCI device speed capability. Return the maximum link speed
+ * supported by the device.
*/
-int pcie_get_speed_cap(struct pci_dev *dev, enum pci_bus_speed *speed)
+enum pci_bus_speed pcie_get_speed_cap(struct pci_dev *dev)
{
- u32 lnkcap;
- int err1, err2;
+ u32 lnkcap2, lnkcap;

- *speed = PCI_SPEED_UNKNOWN;
+ /*
+ * PCIe r4.0 sec 7.5.3.18 recommends using the Supported Link
+ * Speeds Vector in Link Capabilities 2 when supported, falling
+ * back to Max Link Speed in Link Capabilities otherwise.
+ */
+ pcie_capability_read_dword(dev, PCI_EXP_LNKCAP2, &lnkcap2);
+ if (lnkcap2) { /* PCIe r3.0-compliant */
+ if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_16_0GB)
+ return PCIE_SPEED_16_0GT;
+ else if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB)
+ return PCIE_SPEED_8_0GT;
+ else if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB)
+ return PCIE_SPEED_5_0GT;
+ else if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB)
+ return PCIE_SPEED_2_5GT;
+ return PCI_SPEED_UNKNOWN;
+ }

- err1 = pcie_capability_read_dword(dev, PCI_EXP_LNKCAP,
- &lnkcap);
- if (!err1 && lnkcap) {
- if (lnkcap & PCI_EXP_LNKCAP_SLS_8_0GB)
- *speed = PCIE_SPEED_8_0GT;
+ pcie_capability_read_dword(dev, PCI_EXP_LNKCAP, &lnkcap);
+ if (lnkcap) {
+ if (lnkcap & PCI_EXP_LNKCAP_SLS_16_0GB)
+ return PCIE_SPEED_16_0GT;
+ else if (lnkcap & PCI_EXP_LNKCAP_SLS_8_0GB)
+ return PCIE_SPEED_8_0GT;
else if (lnkcap & PCI_EXP_LNKCAP_SLS_5_0GB)
- *speed = PCIE_SPEED_5_0GT;
+ return PCIE_SPEED_5_0GT;
else if (lnkcap & PCI_EXP_LNKCAP_SLS_2_5GB)
- *speed = PCIE_SPEED_2_5GT;
- return 0;
- }
-
- err2 = pcie_capability_read_dword(dev, PCI_EXP_LNKCAP2,
- &lnkcap);
- if (!err2 && lnkcap) { /* PCIe r3.0-compliant */
- if (lnkcap & PCI_EXP_LNKCAP2_SLS_8_0GB)
- *speed = PCIE_SPEED_8_0GT;
- else if (lnkcap & PCI_EXP_LNKCAP2_SLS_5_0GB)
- *speed = PCIE_SPEED_5_0GT;
- else if (lnkcap & PCI_EXP_LNKCAP2_SLS_2_5GB)
- *speed = PCIE_SPEED_2_5GT;
- return 0;
+ return PCIE_SPEED_2_5GT;
}

- return err1 ? err1 : err2;
+ return PCI_SPEED_UNKNOWN;
}
-EXPORT_SYMBOL(pcie_get_speed_cap);

/**
- * pcie_get_width_cap - queries for the PCI device's link width capability
+ * pcie_get_width_cap - query for the PCI device's link width capability
* @dev: PCI device to query
- * @width: storage for link width
*
- * This function queries the PCI device width capability.
+ * Query the PCI device width capability. Return the maximum link width
+ * supported by the device.
*/
-int pcie_get_width_cap(struct pci_dev *dev, enum pcie_link_width *width)
+enum pcie_link_width pcie_get_width_cap(struct pci_dev *dev)
{
u32 lnkcap;
- int err;
-
- *width = PCIE_LNK_WIDTH_UNKNOWN;

- err = pcie_capability_read_dword(dev, PCI_EXP_LNKCAP, &lnkcap);
- if (!err && lnkcap)
- /* Shift start of width mask by 4 to get actual speed cap */
- *width = (lnkcap & PCI_EXP_LNKCAP_MLW) >> 4;
+ pcie_capability_read_dword(dev, PCI_EXP_LNKCAP, &lnkcap);
+ if (lnkcap)
+ return (lnkcap & PCI_EXP_LNKCAP_MLW) >> 4;

- return err;
+ return PCIE_LNK_WIDTH_UNKNOWN;
}
-EXPORT_SYMBOL(pcie_get_width_cap);

/**
- * pcie_bandwidth_capable - Calculates a PCI device's link bandwidth capability
+ * pcie_bandwidth_capable - calculates a PCI device's link bandwidth capability
* @dev: PCI device
* @speed: storage for link speed
* @width: storage for link width
*
- * This function caculates a PCI device's link bandwidth by querying for its
- * link speed and width, multiplying them, and applying encoding overhead.
+ * Calculate a PCI device's link bandwidth by querying for its link speed
+ * and width, multiplying them, and applying encoding overhead.
*/
-int pcie_bandwidth_capable(struct pci_dev *dev, enum pci_bus_speed *speed,
+u32 pcie_bandwidth_capable(struct pci_dev *dev, enum pci_bus_speed *speed,
enum pcie_link_width *width)
{
- pcie_get_speed_cap(dev, speed);
- pcie_get_width_cap(dev, width);
+ *speed = pcie_get_speed_cap(dev);
+ *width = pcie_get_width_cap(dev);

if (*speed == PCI_SPEED_UNKNOWN || *width == PCIE_LNK_WIDTH_UNKNOWN)
return 0;

- return (*width) * PCIE_SPEED2MBS_ENC(*speed);
+ return *width * PCIE_SPEED2MBS_ENC(*speed);
}
-EXPORT_SYMBOL(pcie_bandwidth_capable);

/**
- * pcie_print_link_status - Reports the PCI device's link speed and width.
+ * pcie_print_link_status - Report the PCI device's link speed and width
* @dev: PCI device to query
*
- * This function checks whether the PCI device current speed and width are equal
- * to the maximum PCI device capabilities.
+ * Report the available bandwidth at the device. If this is less than the
+ * device is capable of, report the device's maximum possible bandwidth and
+ * the upstream link that limits its performance to less than that.
*/
void pcie_print_link_status(struct pci_dev *dev)
{
enum pcie_link_width width, width_cap;
- struct pci_dev *limiting_dev = NULL;
enum pci_bus_speed speed, speed_cap;
- int bw, bw_cap;
+ struct pci_dev *limiting_dev = NULL;
+ u32 bw_avail, bw_cap;

bw_cap = pcie_bandwidth_capable(dev, &speed_cap, &width_cap);
- pcie_bandwidth_available(dev, &speed, &width, &bw, &limiting_dev);
+ bw_avail = pcie_bandwidth_available(dev, &limiting_dev, &speed, &width);

- if (bw >= bw_cap)
+ if (bw_avail >= bw_cap)
pci_info(dev, "%d Mb/s available bandwidth (%s x%d link)\n",
- bw, PCIE_SPEED2STR(speed), width);
+ bw_cap, PCIE_SPEED2STR(speed_cap), width_cap);
else
- pci_info(dev, "%d Mb/s available bandwidth (capable of %d Mb/s, %s x%d link)\n",
- bw, bw_cap, PCIE_SPEED2STR(speed_cap), width_cap);
- if (limiting_dev && strcmp(pci_name(limiting_dev), pci_name(dev)))
- pci_info(dev, "Bandwidth limited by device at %s\n",
- pci_name(limiting_dev));
+ pci_info(dev, "%d Mb/s available bandwidth, limited by %s x%d link at %s (capable of %d Mb/s with %s x%d link)\n",
+ bw_avail, PCIE_SPEED2STR(speed), width,
+ limiting_dev ? pci_name(limiting_dev) : "<unknown>",
+ bw_cap, PCIE_SPEED2STR(speed_cap), width_cap);
}
EXPORT_SYMBOL(pcie_print_link_status);

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index fcd81911b127..2a50172b9803 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -253,6 +253,26 @@ bool pci_bus_clip_resource(struct pci_dev *dev, int idx);
void pci_reassigndev_resource_alignment(struct pci_dev *dev);
void pci_disable_bridge_window(struct pci_dev *dev);

+/* PCIe link information */
+#define PCIE_SPEED2STR(speed) \
+ ((speed) == PCIE_SPEED_16_0GT ? "16 GT/s" : \
+ (speed) == PCIE_SPEED_8_0GT ? "8 GT/s" : \
+ (speed) == PCIE_SPEED_5_0GT ? "5 GT/s" : \
+ (speed) == PCIE_SPEED_2_5GT ? "2.5 GT/s" : \
+ "Unknown speed")
+
+/* PCIe speed to Mb/s with encoding overhead: 20% for gen2, ~1.5% for gen3 */
+#define PCIE_SPEED2MBS_ENC(speed) \
+ ((speed) == PCIE_SPEED_8_0GT ? 7877 : \
+ (speed) == PCIE_SPEED_5_0GT ? 4000 : \
+ (speed) == PCIE_SPEED_2_5GT ? 2000 : \
+ 0)
+
+enum pci_bus_speed pcie_get_speed_cap(struct pci_dev *dev);
+enum pcie_link_width pcie_get_width_cap(struct pci_dev *dev);
+u32 pcie_bandwidth_capable(struct pci_dev *dev, enum pci_bus_speed *speed,
+ enum pcie_link_width *width);
+
/* Single Root I/O Virtualization */
struct pci_sriov {
int pos; /* Capability position */
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index ef5377438a1e..86bf045f3d59 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -592,7 +592,7 @@ const unsigned char pcie_link_speed[] = {
PCIE_SPEED_2_5GT, /* 1 */
PCIE_SPEED_5_0GT, /* 2 */
PCIE_SPEED_8_0GT, /* 3 */
- PCI_SPEED_UNKNOWN, /* 4 */
+ PCIE_SPEED_16_0GT, /* 4 */
PCI_SPEED_UNKNOWN, /* 5 */
PCI_SPEED_UNKNOWN, /* 6 */
PCI_SPEED_UNKNOWN, /* 7 */
diff --git a/drivers/pci/slot.c b/drivers/pci/slot.c
index d10f556dc03e..191893e19d5c 100644
--- a/drivers/pci/slot.c
+++ b/drivers/pci/slot.c
@@ -76,6 +76,7 @@ static const char *pci_bus_speed_strings[] = {
"2.5 GT/s PCIe", /* 0x14 */
"5.0 GT/s PCIe", /* 0x15 */
"8.0 GT/s PCIe", /* 0x16 */
+ "16.0 GT/s PCIe", /* 0x17 */
};

static ssize_t bus_speed_read(enum pci_bus_speed speed, char *buf)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 1a672c960c8f..5ccee29fe1b1 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -256,25 +256,10 @@ enum pci_bus_speed {
PCIE_SPEED_2_5GT = 0x14,
PCIE_SPEED_5_0GT = 0x15,
PCIE_SPEED_8_0GT = 0x16,
+ PCIE_SPEED_16_0GT = 0x17,
PCI_SPEED_UNKNOWN = 0xff,
};

-#define PCIE_SPEED2STR(speed) \
- ((speed) == PCIE_SPEED_8_0GT ? "8 GT/s" : \
- (speed) == PCIE_SPEED_5_0GT ? "5 GT/s" : \
- (speed) == PCIE_SPEED_2_5GT ? "2.5 GT/s" : \
- "Unknown speed")
-
-/**
- * PCIe speed to Mb/s with encoding overhead:
- * 20% for gen2, ~1.5% for gen3
- */
-#define PCIE_SPEED2MBS_ENC(speed) \
- ((speed) == PCIE_SPEED_8_0GT ? 7877 : \
- (speed) == PCIE_SPEED_5_0GT ? 4000 : \
- (speed) == PCIE_SPEED_2_5GT ? 2000 : \
- 0)
-
struct pci_cap_saved_data {
u16 cap_nr;
bool cap_extended;
@@ -1096,15 +1081,9 @@ int pcie_get_readrq(struct pci_dev *dev);
int pcie_set_readrq(struct pci_dev *dev, int rq);
int pcie_get_mps(struct pci_dev *dev);
int pcie_set_mps(struct pci_dev *dev, int mps);
-int pcie_get_minimum_link(struct pci_dev *dev, enum pci_bus_speed *speed,
- enum pcie_link_width *width);
-int pcie_bandwidth_available(struct pci_dev *dev, enum pci_bus_speed *speed,
- enum pcie_link_width *width, int *bw,
- struct pci_dev **limiting_dev);
-int pcie_get_speed_cap(struct pci_dev *dev, enum pci_bus_speed *speed);
-int pcie_get_width_cap(struct pci_dev *dev, enum pcie_link_width *width);
-int pcie_bandwidth_capable(struct pci_dev *dev, enum pci_bus_speed *speed,
- enum pcie_link_width *width);
+u32 pcie_bandwidth_available(struct pci_dev *dev, struct pci_dev **limiting_dev,
+ enum pci_bus_speed *speed,
+ enum pcie_link_width *width);
void pcie_print_link_status(struct pci_dev *dev);
void pcie_flr(struct pci_dev *dev);
int __pci_reset_function_locked(struct pci_dev *dev);
diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
index 0c79eac5e9b8..103ba797a8f3 100644
--- a/include/uapi/linux/pci_regs.h
+++ b/include/uapi/linux/pci_regs.h
@@ -520,6 +520,7 @@
#define PCI_EXP_LNKCAP_SLS_2_5GB 0x00000001 /* LNKCAP2 SLS Vector bit 0 */
#define PCI_EXP_LNKCAP_SLS_5_0GB 0x00000002 /* LNKCAP2 SLS Vector bit 1 */
#define PCI_EXP_LNKCAP_SLS_8_0GB 0x00000003 /* LNKCAP2 SLS Vector bit 2 */
+#define PCI_EXP_LNKCAP_SLS_16_0GB 0x00000004 /* LNKCAP2 SLS Vector bit 3 */
#define PCI_EXP_LNKCAP_MLW 0x000003f0 /* Maximum Link Width */
#define PCI_EXP_LNKCAP_ASPMS 0x00000c00 /* ASPM Support */
#define PCI_EXP_LNKCAP_L0SEL 0x00007000 /* L0s Exit Latency */
@@ -547,6 +548,7 @@
#define PCI_EXP_LNKSTA_CLS_2_5GB 0x0001 /* Current Link Speed 2.5GT/s */
#define PCI_EXP_LNKSTA_CLS_5_0GB 0x0002 /* Current Link Speed 5.0GT/s */
#define PCI_EXP_LNKSTA_CLS_8_0GB 0x0003 /* Current Link Speed 8.0GT/s */
+#define PCI_EXP_LNKSTA_CLS_16_0GB 0x0004 /* Current Link Speed 16.0GT/s */
#define PCI_EXP_LNKSTA_NLW 0x03f0 /* Negotiated Link Width */
#define PCI_EXP_LNKSTA_NLW_X1 0x0010 /* Current Link Width x1 */
#define PCI_EXP_LNKSTA_NLW_X2 0x0020 /* Current Link Width x2 */
@@ -648,8 +650,9 @@
#define PCI_CAP_EXP_RC_ENDPOINT_SIZEOF_V2 44 /* v2 endpoints without link end here */
#define PCI_EXP_LNKCAP2 44 /* Link Capabilities 2 */
#define PCI_EXP_LNKCAP2_SLS_2_5GB 0x00000002 /* Supported Speed 2.5GT/s */
-#define PCI_EXP_LNKCAP2_SLS_5_0GB 0x00000004 /* Supported Speed 5.0GT/s */
-#define PCI_EXP_LNKCAP2_SLS_8_0GB 0x00000008 /* Supported Speed 8.0GT/s */
+#define PCI_EXP_LNKCAP2_SLS_5_0GB 0x00000004 /* Supported Speed 5GT/s */
+#define PCI_EXP_LNKCAP2_SLS_8_0GB 0x00000008 /* Supported Speed 8GT/s */
+#define PCI_EXP_LNKCAP2_SLS_16_0GB 0x00000010 /* Supported Speed 16GT/s */
#define PCI_EXP_LNKCAP2_CROSSLINK 0x00000100 /* Crosslink supported */
#define PCI_EXP_LNKCTL2 48 /* Link Control 2 */
#define PCI_EXP_LNKSTA2 50 /* Link Status 2 */
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  Last update: 2018-03-30 23:05    [W:0.178 / U:7.168 seconds]
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