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SubjectRe: [RFC PATCH v2 05/32] PCI/core: use PCIe capabilities access functions to simplify implementation
sorry for delay... i thought i had sent it out yesterday,
but found it today when cleaning up/out the multiple of
windows/xterms on my desktop.


On 07/24/2012 12:31 PM, Jiang Liu wrote:
> From: Jiang Liu<jiang.liu@huawei.com>
>
> Use PCIe capabilities access functions to simplify PCI core implementation.
>
> Signed-off-by: Jiang Liu<liuj97@gmail.com>
> Signed-off-by: Yijing Wang<wangyijing@huawei.com>
> ---
> drivers/pci/pci.c | 260 +++++++++++---------------------------------------
> drivers/pci/probe.c | 18 +---
> drivers/pci/quirks.c | 9 +-
> 3 files changed, 66 insertions(+), 221 deletions(-)
>
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 28eb55b..fd83647 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -254,38 +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)
> -{
> - u16 flags;
> - int pos;
> -
> - pos = pci_pcie_cap(dev);
> - if (pos) {
> - pci_read_config_word(dev, pos + PCI_EXP_FLAGS,&flags);
> - if ((flags& PCI_EXP_FLAGS_VERS)< 2)
> - pos = 0;
> - }
> -
> - return pos;
> -}
> -
> -/**
> * pci_find_ext_capability - Find an extended capability
> * @dev: PCI device to query
> * @cap: capability code
> @@ -854,21 +822,6 @@ EXPORT_SYMBOL(pci_choose_state);
>
> #define PCI_EXP_SAVE_REGS 7
>
> -#define pcie_cap_has_devctl(type, flags) 1
> -#define pcie_cap_has_lnkctl(type, flags) \
> - ((flags& PCI_EXP_FLAGS_VERS)> 1 || \
> - (type == PCI_EXP_TYPE_ROOT_PORT || \
> - type == PCI_EXP_TYPE_ENDPOINT || \
> - type == PCI_EXP_TYPE_LEG_END))
> -#define pcie_cap_has_sltctl(type, flags) \
> - ((flags& PCI_EXP_FLAGS_VERS)> 1 || \
> - ((type == PCI_EXP_TYPE_ROOT_PORT) || \
> - (type == PCI_EXP_TYPE_DOWNSTREAM&& \
> - (flags& PCI_EXP_FLAGS_SLOT))))
> -#define pcie_cap_has_rtctl(type, flags) \
> - ((flags& PCI_EXP_FLAGS_VERS)> 1 || \
> - (type == PCI_EXP_TYPE_ROOT_PORT || \
> - type == PCI_EXP_TYPE_RC_EC))
>
> static struct pci_cap_saved_state *pci_find_saved_cap(
> struct pci_dev *pci_dev, char cap)
> @@ -885,13 +838,11 @@ static struct pci_cap_saved_state *pci_find_saved_cap(
>
> static int pci_save_pcie_state(struct pci_dev *dev)
> {
> - int type, pos, i = 0;
> + int i = 0;
> struct pci_cap_saved_state *save_state;
> u16 *cap;
> - u16 flags;
>
> - pos = pci_pcie_cap(dev);
> - if (!pos)
> + if (!pci_is_pcie(dev))
> return 0;
>
Why not put the above check in all the pci_pcie_capability_read_*() functions ?
Myron did some good cleanup to get rid of these pci_is_pcie() throughout
these functions, and put them in base functions, so it'd be good if that
effort could remain intact.

> save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
> @@ -901,60 +852,35 @@ static int pci_save_pcie_state(struct pci_dev *dev)
> }
> cap = (u16 *)&save_state->cap.data[0];
>
> - pci_read_config_word(dev, pos + PCI_EXP_FLAGS,&flags);
> -
> - type = pci_pcie_type(dev);
> - if (pcie_cap_has_devctl(type, flags))
> - pci_read_config_word(dev, pos + PCI_EXP_DEVCTL,&cap[i++]);
> - if (pcie_cap_has_lnkctl(type, flags))
> - pci_read_config_word(dev, pos + PCI_EXP_LNKCTL,&cap[i++]);
> - if (pcie_cap_has_sltctl(type, flags))
> - pci_read_config_word(dev, pos + PCI_EXP_SLTCTL,&cap[i++]);
> - if (pcie_cap_has_rtctl(type, flags))
> - pci_read_config_word(dev, pos + PCI_EXP_RTCTL,&cap[i++]);
> + pci_pcie_capability_read_word(dev, PCI_EXP_DEVCTL,&cap[i++]);
> + pci_pcie_capability_read_word(dev, PCI_EXP_LNKCTL,&cap[i++]);
> + pci_pcie_capability_read_word(dev, PCI_EXP_SLTCTL,&cap[i++]);
> + pci_pcie_capability_read_word(dev, PCI_EXP_RTCTL,&cap[i++]);
> + pci_pcie_capability_read_word(dev, PCI_EXP_DEVCTL2,&cap[i++]);
> + pci_pcie_capability_read_word(dev, PCI_EXP_LNKCTL2,&cap[i++]);
> + pci_pcie_capability_read_word(dev, PCI_EXP_SLTCTL2,&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, type;
> + int i = 0;
> struct pci_cap_saved_state *save_state;
> u16 *cap;
> - u16 flags;
>
> 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 || !pci_is_pcie(dev))
won't need pci_is_pcie() check if put in pci_pcie_capability_write_*() below...
> return;
> cap = (u16 *)&save_state->cap.data[0];
>
> - pci_read_config_word(dev, pos + PCI_EXP_FLAGS,&flags);
> -
> - type = pci_pcie_type(dev);
> - if (pcie_cap_has_devctl(type, flags))
> - pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, cap[i++]);
> - if (pcie_cap_has_lnkctl(type, flags))
> - pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, cap[i++]);
> - if (pcie_cap_has_sltctl(type, flags))
> - pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]);
> - if (pcie_cap_has_rtctl(type, flags))
> - 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_capability_write_word(dev, PCI_EXP_DEVCTL, cap[i++]);
> + pci_pcie_capability_write_word(dev, PCI_EXP_LNKCTL, cap[i++]);
> + pci_pcie_capability_write_word(dev, PCI_EXP_SLTCTL, cap[i++]);
> + pci_pcie_capability_write_word(dev, PCI_EXP_RTCTL, cap[i++]);
> + pci_pcie_capability_write_word(dev, PCI_EXP_DEVCTL2, cap[i++]);
> + pci_pcie_capability_write_word(dev, PCI_EXP_LNKCTL2, cap[i++]);
> + pci_pcie_capability_write_word(dev, PCI_EXP_SLTCTL2, cap[i++]);
> }
>
>
> @@ -2068,7 +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;
> @@ -2076,26 +2001,20 @@ 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;
> if (!bridge)
> return;
>
> - /* ARI is a PCIe cap v2 feature */
> - pos = pci_pcie_cap2(bridge);
> - if (!pos)
> - return;
> -
> - pci_read_config_dword(bridge, pos + PCI_EXP_DEVCAP2,&cap);
> + pci_pcie_capability_read_dword(bridge, PCI_EXP_DEVCAP2,&cap);
> if (!(cap& PCI_EXP_DEVCAP2_ARI))
> return;
>
> - pci_read_config_word(bridge, pos + PCI_EXP_DEVCTL2,&ctrl);
> + pci_pcie_capability_read_word(bridge, PCI_EXP_DEVCTL2,&ctrl);
> ctrl |= PCI_EXP_DEVCTL2_ARI;
> - pci_write_config_word(bridge, pos + PCI_EXP_DEVCTL2, ctrl);
> + pci_pcie_capability_write_word(bridge, PCI_EXP_DEVCTL2, ctrl);
>
> bridge->ari_enabled = 1;
> }
> @@ -2111,20 +2030,14 @@ 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)
> - return;
> -
> - pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2,&ctrl);
> + pci_pcie_capability_read_word(dev, 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_capability_write_word(dev, PCI_EXP_DEVCTL2, ctrl);
> }
> EXPORT_SYMBOL(pci_enable_ido);
>
> @@ -2135,20 +2048,14 @@ 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)
> - return;
> -
> - pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2,&ctrl);
> + pci_pcie_capability_read_word(dev, 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_capability_write_word(dev, PCI_EXP_DEVCTL2, ctrl);
> }
> EXPORT_SYMBOL(pci_disable_ido);
>
> @@ -2173,17 +2080,11 @@ 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);
> + pci_pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2,&cap);
> if (!(cap& PCI_EXP_OBFF_MASK))
> return -ENOTSUPP; /* no OBFF support at all */
>
> @@ -2194,7 +2095,7 @@ 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_capability_read_word(dev, PCI_EXP_DEVCTL2,&ctrl);
> if (cap& PCI_EXP_OBFF_WAKE)
> ctrl |= PCI_EXP_OBFF_WAKE_EN;
> else {
> @@ -2212,7 +2113,7 @@ 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_capability_write_word(dev, PCI_EXP_DEVCTL2, ctrl);
>
> return 0;
> }
> @@ -2226,17 +2127,11 @@ 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);
> + pci_pcie_capability_read_word(dev, PCI_EXP_DEVCTL2,&ctrl);
> ctrl&= ~PCI_EXP_OBFF_WAKE_EN;
> - pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl);
> + pci_pcie_capability_write_word(dev, PCI_EXP_DEVCTL2, ctrl);
> }
> EXPORT_SYMBOL(pci_disable_obff);
>
> @@ -2249,15 +2144,9 @@ 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)
> - return false;
> -
> - pci_read_config_dword(dev, pos + PCI_EXP_DEVCAP2,&cap);
> + pci_pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2,&cap);
>
> return cap& PCI_EXP_DEVCAP2_LTR;
> }
> @@ -2274,22 +2163,16 @@ 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);
> @@ -2297,9 +2180,9 @@ int pci_enable_ltr(struct pci_dev *dev)
> return ret;
> }
>
> - pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2,&ctrl);
> + pci_pcie_capability_read_word(dev, PCI_EXP_DEVCTL2,&ctrl);
> ctrl |= PCI_EXP_LTR_EN;
> - pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl);
> + pci_pcie_capability_write_word(dev, PCI_EXP_DEVCTL2, ctrl);
>
> return 0;
> }
> @@ -2311,24 +2194,18 @@ 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);
> + if (!pci_ltr_supported(dev))
> + return;
> +
> + pci_pcie_capability_read_word(dev, PCI_EXP_DEVCTL2,&ctrl);
> ctrl&= ~PCI_EXP_LTR_EN;
> - pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl);
> + pci_pcie_capability_write_word(dev, PCI_EXP_DEVCTL2, ctrl);
> }
> EXPORT_SYMBOL(pci_disable_ltr);
>
> @@ -3178,15 +3055,10 @@ 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);
> + pci_pcie_capability_read_dword(dev, PCI_EXP_DEVCAP,&cap);
> if (!(cap& PCI_EXP_DEVCAP_FLR))
> return -ENOTTY;
>
> @@ -3198,7 +3070,7 @@ 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_capability_read_word(dev, PCI_EXP_DEVSTA,&status);
> if (!(status& PCI_EXP_DEVSTA_TRPND))
> goto clear;
> }
> @@ -3207,9 +3079,9 @@ 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_capability_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_capability_write_word(dev, PCI_EXP_DEVCTL, control);
>
> msleep(100);
>
> @@ -3577,18 +3449,11 @@ EXPORT_SYMBOL(pcix_set_mmrbc);
> */
> int pcie_get_readrq(struct pci_dev *dev)
> {
> - int ret, cap;
> u16 ctl;
>
> - cap = pci_pcie_cap(dev);
> - if (!cap)
> - return -EINVAL;
> + pci_pcie_capability_read_word(dev, PCI_EXP_DEVCTL,&ctl);
>
> - ret = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL,&ctl);
> - if (!ret)
> - ret = 128<< ((ctl& PCI_EXP_DEVCTL_READRQ)>> 12);
> -
> - return ret;
> + return 128<< ((ctl& PCI_EXP_DEVCTL_READRQ)>> 12);
> }
> EXPORT_SYMBOL(pcie_get_readrq);
>
> @@ -3602,17 +3467,16 @@ 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)
> + if (!pci_is_pcie(dev))
ditto ^^^

> goto out;
>
> - err = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL,&ctl);
> + err = pci_pcie_capability_read_word(dev, PCI_EXP_DEVCTL,&ctl);
> if (err)
> goto out;
> /*
> @@ -3635,7 +3499,7 @@ 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_capability_write_word(dev, PCI_EXP_DEVCTL, ctl);
> }
>
> out:
> @@ -3652,18 +3516,11 @@ EXPORT_SYMBOL(pcie_set_readrq);
> */
> int pcie_get_mps(struct pci_dev *dev)
> {
> - int ret, cap;
> u16 ctl;
>
> - cap = pci_pcie_cap(dev);
> - if (!cap)
> - return -EINVAL;
> -
> - ret = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL,&ctl);
> - if (!ret)
> - ret = 128<< ((ctl& PCI_EXP_DEVCTL_PAYLOAD)>> 5);
> + pci_pcie_capability_read_word(dev, PCI_EXP_DEVCTL,&ctl);
>
> - return ret;
> + return 128<< ((ctl& PCI_EXP_DEVCTL_PAYLOAD)>> 5);
> }
>
> /**
> @@ -3676,7 +3533,7 @@ 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))
> @@ -3687,18 +3544,17 @@ int pcie_set_mps(struct pci_dev *dev, int mps)
> goto out;
> v<<= 5;
>
> - cap = pci_pcie_cap(dev);
> - if (!cap)
> + if (!pci_is_pcie(dev))
ditto ^^^^^^^^^^
> goto out;

> - err = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL,&ctl);
> + err = pci_pcie_capability_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_capability_write_word(dev, PCI_EXP_DEVCTL, ctl);
> }
> out:
> return err;
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 8bcc985..6a2eac8 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -603,10 +603,11 @@ 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_capability_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_capability_read_word(bridge, PCI_EXP_LNKSTA,&linksta);
> pcie_update_link_speed(bus, linksta);
> }
> }
> @@ -936,17 +937,9 @@ 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);
> + pci_pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP,&reg32);
> if (reg32& PCI_EXP_SLTCAP_HPC)
> pdev->is_hotplug_bridge = 1;
> }
> @@ -1160,8 +1153,7 @@ 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 003f356..484284e 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -3081,17 +3081,14 @@ 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))
ditto if check in capability_write as well

> return -ENOTTY;
>
> if (probe)
> return 0;
>
> - pci_write_config_word(dev, pos + PCI_EXP_DEVCTL,
> - PCI_EXP_DEVCTL_BCR_FLR);
> + pci_pcie_capability_write_word(dev, PCI_EXP_DEVCTL,
> + PCI_EXP_DEVCTL_BCR_FLR);
> msleep(100);
>
> return 0;



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