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Subject[RFC PATCH 06/14] PCI: use PCIe cap access functions to simplify PCI core implementation
Date
From: Jiang Liu <jiang.liu@huawei.com>

Use PCIe cap access functions to simplify PCI core implementation.

Signed-off-by: Jiang Liu <liuj97@gmail.com>
---
drivers/pci/pci.c | 237 ++++++++++++++------------------------------------
drivers/pci/probe.c | 19 ++--
drivers/pci/quirks.c | 8 +-
3 files changed, 73 insertions(+), 191 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 4c6ab70..b8142f1 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -254,34 +254,6 @@ int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap)
}

/**
- * pci_pcie_cap2 - query for devices' PCI_CAP_ID_EXP v2 capability structure
- * @dev: PCI device to check
- *
- * Like pci_pcie_cap() but also checks that the PCIe capability version is
- * >= 2. Note that v1 capability structures could be sparse in that not
- * all register fields were required. v2 requires the entire structure to
- * be present size wise, while still allowing for non-implemented registers
- * to exist but they must be hardwired to 0.
- *
- * Due to the differences in the versions of capability structures, one
- * must be careful not to try and access non-existant registers that may
- * exist in early versions - v1 - of Express devices.
- *
- * Returns the offset of the PCIe capability structure as long as the
- * capability version is >= 2; otherwise 0 is returned.
- */
-static int pci_pcie_cap2(struct pci_dev *dev)
-{
- int pos;
-
- pos = pci_pcie_cap(dev);
- if (pos && !pci_pcie_cap_has_cap2(dev))
- pos = 0;
-
- return pos;
-}
-
-/**
* pci_find_ext_capability - Find an extended capability
* @dev: PCI device to query
* @cap: capability code
@@ -866,12 +838,11 @@ static struct pci_cap_saved_state *pci_find_saved_cap(

static int pci_save_pcie_state(struct pci_dev *dev)
{
- int pos, i = 0;
+ int i = 0;
struct pci_cap_saved_state *save_state;
u16 *cap;

- pos = pci_pcie_cap(dev);
- if (!pos)
+ if (!pci_is_pcie(dev))
return 0;

save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
@@ -881,54 +852,35 @@ static int pci_save_pcie_state(struct pci_dev *dev)
}
cap = (u16 *)&save_state->cap.data[0];

+ pci_pcie_cap_read_word(dev, PCI_EXP_DEVCTL, &cap[i++]);
+ pci_pcie_cap_read_word(dev, PCI_EXP_LNKCTL, &cap[i++]);
+ pci_pcie_cap_read_word(dev, PCI_EXP_SLTCTL, &cap[i++]);
+ pci_pcie_cap_read_word(dev, PCI_EXP_RTCTL, &cap[i++]);
+ pci_pcie_cap_read_word(dev, PCI_EXP_DEVCTL2, &cap[i++]);
+ pci_pcie_cap_read_word(dev, PCI_EXP_LNKCTL2, &cap[i++]);
+ pci_pcie_cap_read_word(dev, PCI_EXP_SLTCTL2, &cap[i++]);

- if (pci_pcie_cap_has_devctl(dev))
- pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &cap[i++]);
- if (pci_pcie_cap_has_lnkctl(dev))
- pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &cap[i++]);
- if (pci_pcie_cap_has_sltctl(dev))
- pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]);
- if (pci_pcie_cap_has_rtctl(dev))
- pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]);
-
- pos = pci_pcie_cap2(dev);
- if (!pos)
- return 0;
-
- pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &cap[i++]);
- pci_read_config_word(dev, pos + PCI_EXP_LNKCTL2, &cap[i++]);
- pci_read_config_word(dev, pos + PCI_EXP_SLTCTL2, &cap[i++]);
return 0;
}

static void pci_restore_pcie_state(struct pci_dev *dev)
{
- int i = 0, pos;
+ int i = 0;
struct pci_cap_saved_state *save_state;
u16 *cap;

save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
- pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
- if (!save_state || pos <= 0)
+ if (!save_state)
return;
cap = (u16 *)&save_state->cap.data[0];

- if (pci_pcie_cap_has_devctl(dev))
- pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, cap[i++]);
- if (pci_pcie_cap_has_lnkctl(dev))
- pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, cap[i++]);
- if (pci_pcie_cap_has_sltctl(dev))
- pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]);
- if (pci_pcie_cap_has_rtctl(dev))
- pci_write_config_word(dev, pos + PCI_EXP_RTCTL, cap[i++]);
-
- pos = pci_pcie_cap2(dev);
- if (!pos)
- return;
-
- pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, cap[i++]);
- pci_write_config_word(dev, pos + PCI_EXP_LNKCTL2, cap[i++]);
- pci_write_config_word(dev, pos + PCI_EXP_SLTCTL2, cap[i++]);
+ pci_pcie_cap_write_word(dev, PCI_EXP_DEVCTL, cap[i++]);
+ pci_pcie_cap_write_word(dev, PCI_EXP_LNKCTL, cap[i++]);
+ pci_pcie_cap_write_word(dev, PCI_EXP_SLTCTL, cap[i++]);
+ pci_pcie_cap_write_word(dev, PCI_EXP_RTCTL, cap[i++]);
+ pci_pcie_cap_write_word(dev, PCI_EXP_DEVCTL2, cap[i++]);
+ pci_pcie_cap_write_word(dev, PCI_EXP_LNKCTL2, cap[i++]);
+ pci_pcie_cap_write_word(dev, PCI_EXP_SLTCTL2, cap[i++]);
}


@@ -2042,7 +1994,6 @@ void pci_free_cap_save_buffers(struct pci_dev *dev)
*/
void pci_enable_ari(struct pci_dev *dev)
{
- int pos;
u32 cap;
u16 ctrl;
struct pci_dev *bridge;
@@ -2050,8 +2001,7 @@ void pci_enable_ari(struct pci_dev *dev)
if (pcie_ari_disabled || !pci_is_pcie(dev) || dev->devfn)
return;

- pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
- if (!pos)
+ if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI))
return;

bridge = dev->bus->self;
@@ -2059,17 +2009,14 @@ void pci_enable_ari(struct pci_dev *dev)
return;

/* ARI is a PCIe cap v2 feature */
- pos = pci_pcie_cap2(bridge);
- if (!pos)
+ if (pci_pcie_cap_read_dword(bridge, PCI_EXP_DEVCAP2, &cap) ||
+ !(cap & PCI_EXP_DEVCAP2_ARI))
return;

- pci_read_config_dword(bridge, pos + PCI_EXP_DEVCAP2, &cap);
- if (!(cap & PCI_EXP_DEVCAP2_ARI))
+ if (pci_pcie_cap_read_word(bridge, PCI_EXP_DEVCTL2, &ctrl))
return;
-
- pci_read_config_word(bridge, pos + PCI_EXP_DEVCTL2, &ctrl);
ctrl |= PCI_EXP_DEVCTL2_ARI;
- pci_write_config_word(bridge, pos + PCI_EXP_DEVCTL2, ctrl);
+ pci_pcie_cap_write_word(bridge, PCI_EXP_DEVCTL2, ctrl);

bridge->ari_enabled = 1;
}
@@ -2085,20 +2032,16 @@ void pci_enable_ari(struct pci_dev *dev)
*/
void pci_enable_ido(struct pci_dev *dev, unsigned long type)
{
- int pos;
u16 ctrl;

/* ID-based Ordering is a PCIe cap v2 feature */
- pos = pci_pcie_cap2(dev);
- if (!pos)
+ if (pci_pcie_cap_read_word(dev, PCI_EXP_DEVCTL2, &ctrl))
return;
-
- pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &ctrl);
if (type & PCI_EXP_IDO_REQUEST)
ctrl |= PCI_EXP_IDO_REQ_EN;
if (type & PCI_EXP_IDO_COMPLETION)
ctrl |= PCI_EXP_IDO_CMP_EN;
- pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl);
+ pci_pcie_cap_write_word(dev, PCI_EXP_DEVCTL2, ctrl);
}
EXPORT_SYMBOL(pci_enable_ido);

@@ -2109,20 +2052,16 @@ EXPORT_SYMBOL(pci_enable_ido);
*/
void pci_disable_ido(struct pci_dev *dev, unsigned long type)
{
- int pos;
u16 ctrl;

/* ID-based Ordering is a PCIe cap v2 feature */
- pos = pci_pcie_cap2(dev);
- if (!pos)
+ if (pci_pcie_cap_read_word(dev, PCI_EXP_DEVCTL2, &ctrl))
return;
-
- pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &ctrl);
if (type & PCI_EXP_IDO_REQUEST)
ctrl &= ~PCI_EXP_IDO_REQ_EN;
if (type & PCI_EXP_IDO_COMPLETION)
ctrl &= ~PCI_EXP_IDO_CMP_EN;
- pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl);
+ pci_pcie_cap_write_word(dev, PCI_EXP_DEVCTL2, ctrl);
}
EXPORT_SYMBOL(pci_disable_ido);

@@ -2147,18 +2086,12 @@ EXPORT_SYMBOL(pci_disable_ido);
*/
int pci_enable_obff(struct pci_dev *dev, enum pci_obff_signal_type type)
{
- int pos;
u32 cap;
u16 ctrl;
int ret;

- /* OBFF is a PCIe cap v2 feature */
- pos = pci_pcie_cap2(dev);
- if (!pos)
- return -ENOTSUPP;
-
- pci_read_config_dword(dev, pos + PCI_EXP_DEVCAP2, &cap);
- if (!(cap & PCI_EXP_OBFF_MASK))
+ if (pci_pcie_cap_read_dword(dev, PCI_EXP_DEVCAP2, &cap) ||
+ !(cap & PCI_EXP_OBFF_MASK))
return -ENOTSUPP; /* no OBFF support at all */

/* Make sure the topology supports OBFF as well */
@@ -2168,7 +2101,7 @@ int pci_enable_obff(struct pci_dev *dev, enum pci_obff_signal_type type)
return ret;
}

- pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &ctrl);
+ pci_pcie_cap_read_word(dev, PCI_EXP_DEVCTL2, &ctrl);
if (cap & PCI_EXP_OBFF_WAKE)
ctrl |= PCI_EXP_OBFF_WAKE_EN;
else {
@@ -2186,7 +2119,7 @@ int pci_enable_obff(struct pci_dev *dev, enum pci_obff_signal_type type)
return -ENOTSUPP;
}
}
- pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl);
+ pci_pcie_cap_write_word(dev, PCI_EXP_DEVCTL2, ctrl);

return 0;
}
@@ -2200,17 +2133,13 @@ EXPORT_SYMBOL(pci_enable_obff);
*/
void pci_disable_obff(struct pci_dev *dev)
{
- int pos;
u16 ctrl;

/* OBFF is a PCIe cap v2 feature */
- pos = pci_pcie_cap2(dev);
- if (!pos)
- return;
-
- pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &ctrl);
- ctrl &= ~PCI_EXP_OBFF_WAKE_EN;
- pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl);
+ if (!pci_pcie_cap_read_word(dev, PCI_EXP_DEVCTL2, &ctrl)) {
+ ctrl &= ~PCI_EXP_OBFF_WAKE_EN;
+ pci_pcie_cap_write_word(dev, PCI_EXP_DEVCTL2, ctrl);
+ }
}
EXPORT_SYMBOL(pci_disable_obff);

@@ -2223,17 +2152,14 @@ EXPORT_SYMBOL(pci_disable_obff);
*/
static bool pci_ltr_supported(struct pci_dev *dev)
{
- int pos;
u32 cap;

/* LTR is a PCIe cap v2 feature */
- pos = pci_pcie_cap2(dev);
- if (!pos)
+ if (pci_pcie_cap_read_dword(dev, PCI_EXP_DEVCAP2, &cap) ||
+ !(cap & PCI_EXP_DEVCAP2_LTR))
return false;

- pci_read_config_dword(dev, pos + PCI_EXP_DEVCAP2, &cap);
-
- return cap & PCI_EXP_DEVCAP2_LTR;
+ return true;
}

/**
@@ -2248,22 +2174,16 @@ static bool pci_ltr_supported(struct pci_dev *dev)
*/
int pci_enable_ltr(struct pci_dev *dev)
{
- int pos;
u16 ctrl;
int ret;

- if (!pci_ltr_supported(dev))
- return -ENOTSUPP;
-
- /* LTR is a PCIe cap v2 feature */
- pos = pci_pcie_cap2(dev);
- if (!pos)
- return -ENOTSUPP;
-
/* Only primary function can enable/disable LTR */
if (PCI_FUNC(dev->devfn) != 0)
return -EINVAL;

+ if (!pci_ltr_supported(dev))
+ return -ENOTSUPP;
+
/* Enable upstream ports first */
if (dev->bus->self) {
ret = pci_enable_ltr(dev->bus->self);
@@ -2271,9 +2191,10 @@ int pci_enable_ltr(struct pci_dev *dev)
return ret;
}

- pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &ctrl);
+ if (pci_pcie_cap_read_word(dev, PCI_EXP_DEVCTL2, &ctrl))
+ return -ENOTSUPP;
ctrl |= PCI_EXP_LTR_EN;
- pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl);
+ pci_pcie_cap_write_word(dev, PCI_EXP_DEVCTL2, ctrl);

return 0;
}
@@ -2285,24 +2206,19 @@ EXPORT_SYMBOL(pci_enable_ltr);
*/
void pci_disable_ltr(struct pci_dev *dev)
{
- int pos;
u16 ctrl;

- if (!pci_ltr_supported(dev))
- return;
-
- /* LTR is a PCIe cap v2 feature */
- pos = pci_pcie_cap2(dev);
- if (!pos)
- return;
-
/* Only primary function can enable/disable LTR */
if (PCI_FUNC(dev->devfn) != 0)
return;

- pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &ctrl);
- ctrl &= ~PCI_EXP_LTR_EN;
- pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl);
+ if (!pci_ltr_supported(dev))
+ return;
+
+ if (!pci_pcie_cap_read_word(dev, PCI_EXP_DEVCTL2, &ctrl)) {
+ ctrl &= ~PCI_EXP_LTR_EN;
+ pci_pcie_cap_write_word(dev, PCI_EXP_DEVCTL2, ctrl);
+ }
}
EXPORT_SYMBOL(pci_disable_ltr);

@@ -3152,16 +3068,11 @@ EXPORT_SYMBOL(pci_set_dma_seg_boundary);
static int pcie_flr(struct pci_dev *dev, int probe)
{
int i;
- int pos;
u32 cap;
u16 status, control;

- pos = pci_pcie_cap(dev);
- if (!pos)
- return -ENOTTY;
-
- pci_read_config_dword(dev, pos + PCI_EXP_DEVCAP, &cap);
- if (!(cap & PCI_EXP_DEVCAP_FLR))
+ if (pci_pcie_cap_read_dword(dev, PCI_EXP_DEVCAP, &cap) ||
+ !(cap & PCI_EXP_DEVCAP_FLR))
return -ENOTTY;

if (probe)
@@ -3172,7 +3083,7 @@ static int pcie_flr(struct pci_dev *dev, int probe)
if (i)
msleep((1 << (i - 1)) * 100);

- pci_read_config_word(dev, pos + PCI_EXP_DEVSTA, &status);
+ pci_pcie_cap_read_word(dev, PCI_EXP_DEVSTA, &status);
if (!(status & PCI_EXP_DEVSTA_TRPND))
goto clear;
}
@@ -3181,9 +3092,9 @@ static int pcie_flr(struct pci_dev *dev, int probe)
"proceeding with reset anyway\n");

clear:
- pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &control);
+ pci_pcie_cap_read_word(dev, PCI_EXP_DEVCTL, &control);
control |= PCI_EXP_DEVCTL_BCR_FLR;
- pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, control);
+ pci_pcie_cap_write_word(dev, PCI_EXP_DEVCTL, control);

msleep(100);

@@ -3551,14 +3462,10 @@ EXPORT_SYMBOL(pcix_set_mmrbc);
*/
int pcie_get_readrq(struct pci_dev *dev)
{
- int ret, cap;
+ int ret;
u16 ctl;

- cap = pci_pcie_cap(dev);
- if (!cap)
- return -EINVAL;
-
- ret = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl);
+ ret = pci_pcie_cap_read_word(dev, PCI_EXP_DEVCTL, &ctl);
if (!ret)
ret = 128 << ((ctl & PCI_EXP_DEVCTL_READRQ) >> 12);

@@ -3576,17 +3483,13 @@ EXPORT_SYMBOL(pcie_get_readrq);
*/
int pcie_set_readrq(struct pci_dev *dev, int rq)
{
- int cap, err = -EINVAL;
+ int err = -EINVAL;
u16 ctl, v;

if (rq < 128 || rq > 4096 || !is_power_of_2(rq))
goto out;

- cap = pci_pcie_cap(dev);
- if (!cap)
- goto out;
-
- err = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl);
+ err = pci_pcie_cap_read_word(dev, PCI_EXP_DEVCTL, &ctl);
if (err)
goto out;
/*
@@ -3609,7 +3512,7 @@ int pcie_set_readrq(struct pci_dev *dev, int rq)
if ((ctl & PCI_EXP_DEVCTL_READRQ) != v) {
ctl &= ~PCI_EXP_DEVCTL_READRQ;
ctl |= v;
- err = pci_write_config_word(dev, cap + PCI_EXP_DEVCTL, ctl);
+ err = pci_pcie_cap_write_word(dev, PCI_EXP_DEVCTL, ctl);
}

out:
@@ -3626,14 +3529,10 @@ EXPORT_SYMBOL(pcie_set_readrq);
*/
int pcie_get_mps(struct pci_dev *dev)
{
- int ret, cap;
+ int ret;
u16 ctl;

- cap = pci_pcie_cap(dev);
- if (!cap)
- return -EINVAL;
-
- ret = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl);
+ ret = pci_pcie_cap_read_word(dev, PCI_EXP_DEVCTL, &ctl);
if (!ret)
ret = 128 << ((ctl & PCI_EXP_DEVCTL_PAYLOAD) >> 5);

@@ -3650,7 +3549,7 @@ int pcie_get_mps(struct pci_dev *dev)
*/
int pcie_set_mps(struct pci_dev *dev, int mps)
{
- int cap, err = -EINVAL;
+ int err = -EINVAL;
u16 ctl, v;

if (mps < 128 || mps > 4096 || !is_power_of_2(mps))
@@ -3661,18 +3560,14 @@ int pcie_set_mps(struct pci_dev *dev, int mps)
goto out;
v <<= 5;

- cap = pci_pcie_cap(dev);
- if (!cap)
- goto out;
-
- err = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl);
+ err = pci_pcie_cap_read_word(dev, PCI_EXP_DEVCTL, &ctl);
if (err)
goto out;

if ((ctl & PCI_EXP_DEVCTL_PAYLOAD) != v) {
ctl &= ~PCI_EXP_DEVCTL_PAYLOAD;
ctl |= v;
- err = pci_write_config_word(dev, cap + PCI_EXP_DEVCTL, ctl);
+ err = pci_pcie_cap_write_word(dev, PCI_EXP_DEVCTL, ctl);
}
out:
return err;
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 446933d..5112ff5 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -603,10 +603,10 @@ static void pci_set_bus_speed(struct pci_bus *bus)
u32 linkcap;
u16 linksta;

- pci_read_config_dword(bridge, pos + PCI_EXP_LNKCAP, &linkcap);
+ pci_pcie_cap_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap);
bus->max_bus_speed = pcie_link_speed[linkcap & 0xf];

- pci_read_config_word(bridge, pos + PCI_EXP_LNKSTA, &linksta);
+ pci_pcie_cap_read_word(bridge, PCI_EXP_LNKSTA, &linksta);
pcie_update_link_speed(bus, linksta);
}
}
@@ -936,18 +936,10 @@ void set_pcie_port_type(struct pci_dev *pdev)

void set_pcie_hotplug_bridge(struct pci_dev *pdev)
{
- int pos;
- u16 reg16;
u32 reg32;

- pos = pci_pcie_cap(pdev);
- if (!pos)
- return;
- pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, &reg16);
- if (!(reg16 & PCI_EXP_FLAGS_SLOT))
- return;
- pci_read_config_dword(pdev, pos + PCI_EXP_SLTCAP, &reg32);
- if (reg32 & PCI_EXP_SLTCAP_HPC)
+ if (!pci_pcie_cap_read_dword(pdev, PCI_EXP_SLTCAP, &reg32) &&
+ (reg32 & PCI_EXP_SLTCAP_HPC))
pdev->is_hotplug_bridge = 1;
}

@@ -1160,8 +1152,7 @@ int pci_cfg_space_size(struct pci_dev *dev)
if (class == PCI_CLASS_BRIDGE_HOST)
return pci_cfg_space_size_ext(dev);

- pos = pci_pcie_cap(dev);
- if (!pos) {
+ if (!pci_is_pcie(dev)) {
pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
if (!pos)
goto fail;
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 52f44b5..7586c24 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3093,17 +3093,13 @@ static int reset_intel_generic_dev(struct pci_dev *dev, int probe)

static int reset_intel_82599_sfp_virtfn(struct pci_dev *dev, int probe)
{
- int pos;
-
- pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
- if (!pos)
+ if (!pci_is_pcie(dev))
return -ENOTTY;

if (probe)
return 0;

- pci_write_config_word(dev, pos + PCI_EXP_DEVCTL,
- PCI_EXP_DEVCTL_BCR_FLR);
+ pci_pcie_cap_write_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_BCR_FLR);
msleep(100);

return 0;
--
1.7.9.5


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