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authorRafael J. Wysocki <rjw@sisk.pl>2008-12-07 22:02:58 +0100
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-01-07 11:12:40 -0800
commit63f4898ace2788a89ed685672aab092e1c3e50e6 (patch)
treeed57eeeb486466697c3d97feaf34396dd2a2b992
parent894886e5d3de0bde2eded8a39bf7e76023fbd791 (diff)
PCI: handle PCI state saving with interrupts disabled
Since interrupts will soon be disabled at PCI resume time, we need to pre-allocate memory to save/restore PCI config space (or use GFP_ATOMIC, but this is safer). Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: "Rafael J. Wysocki" <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
-rw-r--r--drivers/pci/pci.c73
-rw-r--r--drivers/pci/pci.h1
-rw-r--r--drivers/pci/probe.c3
3 files changed, 55 insertions, 22 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 47663dc0daf..3222f902270 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -640,19 +640,14 @@ static int pci_save_pcie_state(struct pci_dev *dev)
int pos, i = 0;
struct pci_cap_saved_state *save_state;
u16 *cap;
- int found = 0;
pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
if (pos <= 0)
return 0;
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
- if (!save_state)
- save_state = kzalloc(sizeof(*save_state) + sizeof(u16) * 4, GFP_KERNEL);
- else
- found = 1;
if (!save_state) {
- dev_err(&dev->dev, "out of memory in pci_save_pcie_state\n");
+ dev_err(&dev->dev, "buffer not found in %s\n", __FUNCTION__);
return -ENOMEM;
}
cap = (u16 *)&save_state->data[0];
@@ -661,9 +656,7 @@ static int pci_save_pcie_state(struct pci_dev *dev)
pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &cap[i++]);
pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]);
pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]);
- save_state->cap_nr = PCI_CAP_ID_EXP;
- if (!found)
- pci_add_saved_cap(dev, save_state);
+
return 0;
}
@@ -688,30 +681,21 @@ static void pci_restore_pcie_state(struct pci_dev *dev)
static int pci_save_pcix_state(struct pci_dev *dev)
{
- int pos, i = 0;
+ int pos;
struct pci_cap_saved_state *save_state;
- u16 *cap;
- int found = 0;
pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
if (pos <= 0)
return 0;
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX);
- if (!save_state)
- save_state = kzalloc(sizeof(*save_state) + sizeof(u16), GFP_KERNEL);
- else
- found = 1;
if (!save_state) {
- dev_err(&dev->dev, "out of memory in pci_save_pcie_state\n");
+ dev_err(&dev->dev, "buffer not found in %s\n", __FUNCTION__);
return -ENOMEM;
}
- cap = (u16 *)&save_state->data[0];
- pci_read_config_word(dev, pos + PCI_X_CMD, &cap[i++]);
- save_state->cap_nr = PCI_CAP_ID_PCIX;
- if (!found)
- pci_add_saved_cap(dev, save_state);
+ pci_read_config_word(dev, pos + PCI_X_CMD, (u16 *)save_state->data);
+
return 0;
}
@@ -1301,6 +1285,51 @@ void pci_pm_init(struct pci_dev *dev)
}
/**
+ * pci_add_save_buffer - allocate buffer for saving given capability registers
+ * @dev: the PCI device
+ * @cap: the capability to allocate the buffer for
+ * @size: requested size of the buffer
+ */
+static int pci_add_cap_save_buffer(
+ struct pci_dev *dev, char cap, unsigned int size)
+{
+ int pos;
+ struct pci_cap_saved_state *save_state;
+
+ pos = pci_find_capability(dev, cap);
+ if (pos <= 0)
+ return 0;
+
+ save_state = kzalloc(sizeof(*save_state) + size, GFP_KERNEL);
+ if (!save_state)
+ return -ENOMEM;
+
+ save_state->cap_nr = cap;
+ pci_add_saved_cap(dev, save_state);
+
+ return 0;
+}
+
+/**
+ * pci_allocate_cap_save_buffers - allocate buffers for saving capabilities
+ * @dev: the PCI device
+ */
+void pci_allocate_cap_save_buffers(struct pci_dev *dev)
+{
+ int error;
+
+ error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_EXP, 4 * sizeof(u16));
+ if (error)
+ dev_err(&dev->dev,
+ "unable to preallocate PCI Express save buffer\n");
+
+ error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_PCIX, sizeof(u16));
+ if (error)
+ dev_err(&dev->dev,
+ "unable to preallocate PCI-X save buffer\n");
+}
+
+/**
* pci_enable_ari - enable ARI forwarding if hardware support it
* @dev: the PCI device
*/
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 9162e242b99..7242b511a93 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -45,6 +45,7 @@ struct pci_platform_pm_ops {
extern int pci_set_platform_pm(struct pci_platform_pm_ops *ops);
extern void pci_pm_init(struct pci_dev *dev);
+extern void pci_allocate_cap_save_buffers(struct pci_dev *dev);
extern int pci_user_read_config_byte(struct pci_dev *dev, int where, u8 *val);
extern int pci_user_read_config_word(struct pci_dev *dev, int where, u16 *val);
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index eb2b985beb4..5dcf2b65e3f 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -958,6 +958,9 @@ static void pci_init_capabilities(struct pci_dev *dev)
/* MSI/MSI-X list */
pci_msi_init_pci_dev(dev);
+ /* Buffers for saving PCIe and PCI-X capabilities */
+ pci_allocate_cap_save_buffers(dev);
+
/* Power Management */
pci_pm_init(dev);