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authorBjorn Helgaas <bhelgaas@google.com>2015-07-17 23:15:19 +0300
committerBjorn Helgaas <bhelgaas@google.com>2015-08-13 23:57:21 +0300
commitd544d75ac96aa1b0a8a378826626a0fbd8ce4380 (patch)
treec289b1bd150373bfea74cbf2a224d9bd2569ae28 /drivers/pci/ats.c
parentedc90fee916b4f0d14af9c6b5c08666747488ef8 (diff)
downloadlinux-d544d75ac96aa1b0a8a378826626a0fbd8ce4380.tar.xz
PCI: Embed ATS info directly into struct pci_dev
The pci_ats struct is small and will get smaller, so I don't think it's worth allocating it separately from the pci_dev struct. Embed the ATS fields directly into struct pci_dev. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/pci/ats.c')
-rw-r--r--drivers/pci/ats.c61
1 files changed, 21 insertions, 40 deletions
diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c
index 2026f5388796..690ae6e6786c 100644
--- a/drivers/pci/ats.c
+++ b/drivers/pci/ats.c
@@ -21,29 +21,15 @@ static void ats_alloc_one(struct pci_dev *dev)
{
int pos;
u16 cap;
- struct pci_ats *ats;
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS);
if (!pos)
return;
- ats = kzalloc(sizeof(*ats), GFP_KERNEL);
- if (!ats) {
- dev_warn(&dev->dev, "can't allocate space for ATS state\n");
- return;
- }
-
- ats->pos = pos;
- pci_read_config_word(dev, pos + PCI_ATS_CAP, &cap);
- ats->qdep = PCI_ATS_CAP_QDEP(cap) ? PCI_ATS_CAP_QDEP(cap) :
+ dev->ats_cap = pos;
+ pci_read_config_word(dev, dev->ats_cap + PCI_ATS_CAP, &cap);
+ dev->ats_qdep = PCI_ATS_CAP_QDEP(cap) ? PCI_ATS_CAP_QDEP(cap) :
PCI_ATS_MAX_QDEP;
- dev->ats = ats;
-}
-
-static void ats_free_one(struct pci_dev *dev)
-{
- kfree(dev->ats);
- dev->ats = NULL;
}
void pci_ats_init(struct pci_dev *dev)
@@ -51,11 +37,6 @@ void pci_ats_init(struct pci_dev *dev)
ats_alloc_one(dev);
}
-void pci_ats_free(struct pci_dev *dev)
-{
- ats_free_one(dev);
-}
-
/**
* pci_enable_ats - enable the ATS capability
* @dev: the PCI device
@@ -67,9 +48,9 @@ int pci_enable_ats(struct pci_dev *dev, int ps)
{
u16 ctrl;
- BUG_ON(dev->ats && dev->ats->is_enabled);
+ BUG_ON(dev->ats_cap && dev->ats_enabled);
- if (!dev->ats)
+ if (!dev->ats_cap)
return -EINVAL;
if (ps < PCI_ATS_MIN_STU)
@@ -83,17 +64,17 @@ int pci_enable_ats(struct pci_dev *dev, int ps)
if (dev->is_virtfn) {
struct pci_dev *pdev = dev->physfn;
- if (pdev->ats->stu != ps)
+ if (pdev->ats_stu != ps)
return -EINVAL;
- atomic_inc(&pdev->ats->ref_cnt); /* count enabled VFs */
+ atomic_inc(&pdev->ats_ref_cnt); /* count enabled VFs */
} else {
- dev->ats->stu = ps;
- ctrl |= PCI_ATS_CTRL_STU(dev->ats->stu - PCI_ATS_MIN_STU);
+ dev->ats_stu = ps;
+ ctrl |= PCI_ATS_CTRL_STU(dev->ats_stu - PCI_ATS_MIN_STU);
}
- pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl);
+ pci_write_config_word(dev, dev->ats_cap + PCI_ATS_CTRL, ctrl);
- dev->ats->is_enabled = 1;
+ dev->ats_enabled = 1;
return 0;
}
EXPORT_SYMBOL_GPL(pci_enable_ats);
@@ -106,22 +87,22 @@ void pci_disable_ats(struct pci_dev *dev)
{
u16 ctrl;
- BUG_ON(!dev->ats || !dev->ats->is_enabled);
+ BUG_ON(!dev->ats_cap || !dev->ats_enabled);
- if (atomic_read(&dev->ats->ref_cnt))
+ if (atomic_read(&dev->ats_ref_cnt))
return; /* VFs still enabled */
if (dev->is_virtfn) {
struct pci_dev *pdev = dev->physfn;
- atomic_dec(&pdev->ats->ref_cnt);
+ atomic_dec(&pdev->ats_ref_cnt);
}
- pci_read_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, &ctrl);
+ pci_read_config_word(dev, dev->ats_cap + PCI_ATS_CTRL, &ctrl);
ctrl &= ~PCI_ATS_CTRL_ENABLE;
- pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl);
+ pci_write_config_word(dev, dev->ats_cap + PCI_ATS_CTRL, ctrl);
- dev->ats->is_enabled = 0;
+ dev->ats_enabled = 0;
}
EXPORT_SYMBOL_GPL(pci_disable_ats);
@@ -136,8 +117,8 @@ void pci_restore_ats_state(struct pci_dev *dev)
ctrl = PCI_ATS_CTRL_ENABLE;
if (!dev->is_virtfn)
- ctrl |= PCI_ATS_CTRL_STU(dev->ats->stu - PCI_ATS_MIN_STU);
- pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl);
+ ctrl |= PCI_ATS_CTRL_STU(dev->ats_stu - PCI_ATS_MIN_STU);
+ pci_write_config_word(dev, dev->ats_cap + PCI_ATS_CTRL, ctrl);
}
EXPORT_SYMBOL_GPL(pci_restore_ats_state);
@@ -158,8 +139,8 @@ int pci_ats_queue_depth(struct pci_dev *dev)
if (dev->is_virtfn)
return 0;
- if (dev->ats)
- return dev->ats->qdep;
+ if (dev->ats_cap)
+ return dev->ats_qdep;
return -ENODEV;
}