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path: root/drivers/pci/pci.c
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Diffstat (limited to 'drivers/pci/pci.c')
-rw-r--r--drivers/pci/pci.c153
1 files changed, 148 insertions, 5 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 6d4a5319148..af295bb21d6 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -88,6 +88,12 @@ enum pcie_bus_config_types pcie_bus_config = PCIE_BUS_TUNE_OFF;
u8 pci_dfl_cache_line_size __devinitdata = L1_CACHE_BYTES >> 2;
u8 pci_cache_line_size;
+/*
+ * If we set up a device for bus mastering, we need to check the latency
+ * timer as certain BIOSes forget to set it properly.
+ */
+unsigned int pcibios_max_latency = 255;
+
/**
* pci_bus_max_busnr - returns maximum PCI bus number of given bus' children
* @bus: pointer to PCI bus structure to search
@@ -959,6 +965,7 @@ void pci_restore_state(struct pci_dev *dev)
/* PCI Express register must be restored first */
pci_restore_pcie_state(dev);
+ pci_restore_ats_state(dev);
/*
* The Base Address register should be programmed before the command
@@ -967,7 +974,7 @@ void pci_restore_state(struct pci_dev *dev)
for (i = 15; i >= 0; i--) {
pci_read_config_dword(dev, i * 4, &val);
if (val != dev->saved_config_space[i]) {
- dev_printk(KERN_DEBUG, &dev->dev, "restoring config "
+ dev_dbg(&dev->dev, "restoring config "
"space at offset %#x (was %#x, writing %#x)\n",
i, val, (int)dev->saved_config_space[i]);
pci_write_config_dword(dev,i * 4,
@@ -1536,8 +1543,7 @@ void pci_pme_active(struct pci_dev *dev, bool enable)
}
out:
- dev_printk(KERN_DEBUG, &dev->dev, "PME# %s\n",
- enable ? "enabled" : "disabled");
+ dev_dbg(&dev->dev, "PME# %s\n", enable ? "enabled" : "disabled");
}
/**
@@ -2596,6 +2602,33 @@ static void __pci_set_master(struct pci_dev *dev, bool enable)
}
/**
+ * pcibios_set_master - enable PCI bus-mastering for device dev
+ * @dev: the PCI device to enable
+ *
+ * Enables PCI bus-mastering for the device. This is the default
+ * implementation. Architecture specific implementations can override
+ * this if necessary.
+ */
+void __weak pcibios_set_master(struct pci_dev *dev)
+{
+ u8 lat;
+
+ /* The latency timer doesn't apply to PCIe (either Type 0 or Type 1) */
+ if (pci_is_pcie(dev))
+ return;
+
+ pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
+ if (lat < 16)
+ lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
+ else if (lat > pcibios_max_latency)
+ lat = pcibios_max_latency;
+ else
+ return;
+ dev_printk(KERN_DEBUG, &dev->dev, "setting latency timer to %d\n", lat);
+ pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
+}
+
+/**
* pci_set_master - enables bus-mastering for device dev
* @dev: the PCI device to enable
*
@@ -2768,6 +2801,116 @@ pci_intx(struct pci_dev *pdev, int enable)
}
/**
+ * pci_intx_mask_supported - probe for INTx masking support
+ * @dev: the PCI device to operate on
+ *
+ * Check if the device dev support INTx masking via the config space
+ * command word.
+ */
+bool pci_intx_mask_supported(struct pci_dev *dev)
+{
+ bool mask_supported = false;
+ u16 orig, new;
+
+ pci_cfg_access_lock(dev);
+
+ pci_read_config_word(dev, PCI_COMMAND, &orig);
+ pci_write_config_word(dev, PCI_COMMAND,
+ orig ^ PCI_COMMAND_INTX_DISABLE);
+ pci_read_config_word(dev, PCI_COMMAND, &new);
+
+ /*
+ * There's no way to protect against hardware bugs or detect them
+ * reliably, but as long as we know what the value should be, let's
+ * go ahead and check it.
+ */
+ if ((new ^ orig) & ~PCI_COMMAND_INTX_DISABLE) {
+ dev_err(&dev->dev, "Command register changed from "
+ "0x%x to 0x%x: driver or hardware bug?\n", orig, new);
+ } else if ((new ^ orig) & PCI_COMMAND_INTX_DISABLE) {
+ mask_supported = true;
+ pci_write_config_word(dev, PCI_COMMAND, orig);
+ }
+
+ pci_cfg_access_unlock(dev);
+ return mask_supported;
+}
+EXPORT_SYMBOL_GPL(pci_intx_mask_supported);
+
+static bool pci_check_and_set_intx_mask(struct pci_dev *dev, bool mask)
+{
+ struct pci_bus *bus = dev->bus;
+ bool mask_updated = true;
+ u32 cmd_status_dword;
+ u16 origcmd, newcmd;
+ unsigned long flags;
+ bool irq_pending;
+
+ /*
+ * We do a single dword read to retrieve both command and status.
+ * Document assumptions that make this possible.
+ */
+ BUILD_BUG_ON(PCI_COMMAND % 4);
+ BUILD_BUG_ON(PCI_COMMAND + 2 != PCI_STATUS);
+
+ raw_spin_lock_irqsave(&pci_lock, flags);
+
+ bus->ops->read(bus, dev->devfn, PCI_COMMAND, 4, &cmd_status_dword);
+
+ irq_pending = (cmd_status_dword >> 16) & PCI_STATUS_INTERRUPT;
+
+ /*
+ * Check interrupt status register to see whether our device
+ * triggered the interrupt (when masking) or the next IRQ is
+ * already pending (when unmasking).
+ */
+ if (mask != irq_pending) {
+ mask_updated = false;
+ goto done;
+ }
+
+ origcmd = cmd_status_dword;
+ newcmd = origcmd & ~PCI_COMMAND_INTX_DISABLE;
+ if (mask)
+ newcmd |= PCI_COMMAND_INTX_DISABLE;
+ if (newcmd != origcmd)
+ bus->ops->write(bus, dev->devfn, PCI_COMMAND, 2, newcmd);
+
+done:
+ raw_spin_unlock_irqrestore(&pci_lock, flags);
+
+ return mask_updated;
+}
+
+/**
+ * pci_check_and_mask_intx - mask INTx on pending interrupt
+ * @dev: the PCI device to operate on
+ *
+ * Check if the device dev has its INTx line asserted, mask it and
+ * return true in that case. False is returned if not interrupt was
+ * pending.
+ */
+bool pci_check_and_mask_intx(struct pci_dev *dev)
+{
+ return pci_check_and_set_intx_mask(dev, true);
+}
+EXPORT_SYMBOL_GPL(pci_check_and_mask_intx);
+
+/**
+ * pci_check_and_mask_intx - unmask INTx of no interrupt is pending
+ * @dev: the PCI device to operate on
+ *
+ * Check if the device dev has its INTx line asserted, unmask it if not
+ * and return true. False is returned and the mask remains active if
+ * there was still an interrupt pending.
+ */
+bool pci_check_and_unmask_intx(struct pci_dev *dev)
+{
+ return pci_check_and_set_intx_mask(dev, false);
+}
+EXPORT_SYMBOL_GPL(pci_check_and_unmask_intx);
+
+/**
* pci_msi_off - disables any msi or msix capabilities
* @dev: the PCI device to operate on
*
@@ -2965,7 +3108,7 @@ static int pci_dev_reset(struct pci_dev *dev, int probe)
might_sleep();
if (!probe) {
- pci_block_user_cfg_access(dev);
+ pci_cfg_access_lock(dev);
/* block PM suspend, driver probe, etc. */
device_lock(&dev->dev);
}
@@ -2990,7 +3133,7 @@ static int pci_dev_reset(struct pci_dev *dev, int probe)
done:
if (!probe) {
device_unlock(&dev->dev);
- pci_unblock_user_cfg_access(dev);
+ pci_cfg_access_unlock(dev);
}
return rc;