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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.c123
1 files changed, 102 insertions, 21 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index a544997..5a14b73 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -490,6 +490,47 @@ static void pci_restore_pcie_state(struct pci_dev *dev)
kfree(save_state);
}
+
+static int pci_save_pcix_state(struct pci_dev *dev)
+{
+ int pos, i = 0;
+ struct pci_cap_saved_state *save_state;
+ u16 *cap;
+
+ pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
+ if (pos <= 0)
+ return 0;
+
+ save_state = kzalloc(sizeof(*save_state) + sizeof(u16), GFP_KERNEL);
+ if (!save_state) {
+ dev_err(&dev->dev, "Out of memory in pci_save_pcie_state\n");
+ return -ENOMEM;
+ }
+ cap = (u16 *)&save_state->data[0];
+
+ pci_read_config_word(dev, pos + PCI_X_CMD, &cap[i++]);
+ pci_add_saved_cap(dev, save_state);
+ return 0;
+}
+
+static void pci_restore_pcix_state(struct pci_dev *dev)
+{
+ int i = 0, pos;
+ struct pci_cap_saved_state *save_state;
+ u16 *cap;
+
+ save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX);
+ pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
+ if (!save_state || pos <= 0)
+ return;
+ cap = (u16 *)&save_state->data[0];
+
+ pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]);
+ pci_remove_saved_cap(save_state);
+ kfree(save_state);
+}
+
+
/**
* pci_save_state - save the PCI configuration space of a device before suspending
* @dev: - PCI device that we're dealing with
@@ -507,6 +548,8 @@ pci_save_state(struct pci_dev *dev)
return i;
if ((i = pci_save_pcie_state(dev)) != 0)
return i;
+ if ((i = pci_save_pcix_state(dev)) != 0)
+ return i;
return 0;
}
@@ -538,6 +581,7 @@ pci_restore_state(struct pci_dev *dev)
dev->saved_config_space[i]);
}
}
+ pci_restore_pcix_state(dev);
pci_restore_msi_state(dev);
pci_restore_msix_state(dev);
return 0;
@@ -568,30 +612,51 @@ pci_enable_device_bars(struct pci_dev *dev, int bars)
}
/**
- * pci_enable_device - Initialize device before it's used by a driver.
+ * __pci_enable_device - Initialize device before it's used by a driver.
* @dev: PCI device to be initialized
*
* Initialize device before it's used by a driver. Ask low-level code
* to enable I/O and memory. Wake up the device if it was suspended.
* Beware, this function can fail.
+ *
+ * Note this function is a backend and is not supposed to be called by
+ * normal code, use pci_enable_device() instead.
*/
int
-pci_enable_device(struct pci_dev *dev)
+__pci_enable_device(struct pci_dev *dev)
{
int err;
- if (dev->is_enabled)
- return 0;
-
err = pci_enable_device_bars(dev, (1 << PCI_NUM_RESOURCES) - 1);
if (err)
return err;
pci_fixup_device(pci_fixup_enable, dev);
- dev->is_enabled = 1;
return 0;
}
/**
+ * pci_enable_device - Initialize device before it's used by a driver.
+ * @dev: PCI device to be initialized
+ *
+ * Initialize device before it's used by a driver. Ask low-level code
+ * to enable I/O and memory. Wake up the device if it was suspended.
+ * Beware, this function can fail.
+ *
+ * Note we don't actually enable the device many times if we call
+ * this function repeatedly (we just increment the count).
+ */
+int pci_enable_device(struct pci_dev *dev)
+{
+ int result;
+ if (atomic_add_return(1, &dev->enable_cnt) > 1)
+ return 0; /* already enabled */
+ result = __pci_enable_device(dev);
+ if (result < 0)
+ atomic_dec(&dev->enable_cnt);
+ return result;
+}
+
+/**
* pcibios_disable_device - disable arch specific PCI resources for device dev
* @dev: the PCI device to disable
*
@@ -607,12 +672,18 @@ void __attribute__ ((weak)) pcibios_disable_device (struct pci_dev *dev) {}
*
* Signal to the system that the PCI device is not in use by the system
* anymore. This only involves disabling PCI bus-mastering, if active.
+ *
+ * Note we don't actually disable the device until all callers of
+ * pci_device_enable() have called pci_device_disable().
*/
void
pci_disable_device(struct pci_dev *dev)
{
u16 pci_command;
+ if (atomic_sub_return(1, &dev->enable_cnt) != 0)
+ return;
+
if (dev->msi_enabled)
disable_msi_mode(dev, pci_find_capability(dev, PCI_CAP_ID_MSI),
PCI_CAP_ID_MSI);
@@ -628,7 +699,6 @@ pci_disable_device(struct pci_dev *dev)
dev->is_busmaster = 0;
pcibios_disable_device(dev);
- dev->is_enabled = 0;
}
/**
@@ -831,22 +901,38 @@ pci_set_master(struct pci_dev *dev)
pcibios_set_master(dev);
}
-#ifndef HAVE_ARCH_PCI_MWI
+#ifdef PCI_DISABLE_MWI
+int pci_set_mwi(struct pci_dev *dev)
+{
+ return 0;
+}
+
+void pci_clear_mwi(struct pci_dev *dev)
+{
+}
+
+#else
+
+#ifndef PCI_CACHE_LINE_BYTES
+#define PCI_CACHE_LINE_BYTES L1_CACHE_BYTES
+#endif
+
/* This can be overridden by arch code. */
-u8 pci_cache_line_size = L1_CACHE_BYTES >> 2;
+/* Don't forget this is measured in 32-bit words, not bytes */
+u8 pci_cache_line_size = PCI_CACHE_LINE_BYTES / 4;
/**
- * pci_generic_prep_mwi - helper function for pci_set_mwi
- * @dev: the PCI device for which MWI is enabled
+ * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed
+ * @dev: the PCI device for which MWI is to be enabled
*
- * Helper function for generic implementation of pcibios_prep_mwi
- * function. Originally copied from drivers/net/acenic.c.
+ * Helper function for pci_set_mwi.
+ * Originally copied from drivers/net/acenic.c.
* Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>.
*
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
*/
static int
-pci_generic_prep_mwi(struct pci_dev *dev)
+pci_set_cacheline_size(struct pci_dev *dev)
{
u8 cacheline_size;
@@ -872,7 +958,6 @@ pci_generic_prep_mwi(struct pci_dev *dev)
return -EINVAL;
}
-#endif /* !HAVE_ARCH_PCI_MWI */
/**
* pci_set_mwi - enables memory-write-invalidate PCI transaction
@@ -890,12 +975,7 @@ pci_set_mwi(struct pci_dev *dev)
int rc;
u16 cmd;
-#ifdef HAVE_ARCH_PCI_MWI
- rc = pcibios_prep_mwi(dev);
-#else
- rc = pci_generic_prep_mwi(dev);
-#endif
-
+ rc = pci_set_cacheline_size(dev);
if (rc)
return rc;
@@ -926,6 +1006,7 @@ pci_clear_mwi(struct pci_dev *dev)
pci_write_config_word(dev, PCI_COMMAND, cmd);
}
}
+#endif /* ! PCI_DISABLE_MWI */
/**
* pci_intx - enables/disables PCI INTx for device dev
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