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Date: Sat, 5 Jul 2008 09:34:12 -0400
From: Matthew Wilcox <matthew@....cx>
To: linux-pci@...r.kernel.org
Cc: kaneshige.kenji@...fujitsu.com, mingo@...e.hu, tglx@...utronix.de,
davem@...emloft.net, dan.j.williams@...el.com,
Martine.Silbermann@...com, benh@...nel.crashing.org,
michael@...erman.id.au, linux-kernel@...r.kernel.org,
Matthew Wilcox <matthew@....cx>,
Matthew Wilcox <willy@...ux.intel.com>
Subject: [PATCH 1/4] PCI MSI: Store the number of messages in the msi_desc
This first part simply changes the msi_attrib data structure to store
how many vectors have been allocated. In order to do this, I shrink the
'type' from 5 bits to 2 and rename it to _type to catch any unsuspecting
users.
Signed-off-by: Matthew Wilcox <willy@...ux.intel.com>
---
drivers/pci/msi.c | 41 ++++++++++++++++++++++++-----------------
drivers/pci/msi.h | 4 ----
include/linux/msi.h | 6 +++++-
3 files changed, 29 insertions(+), 22 deletions(-)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 8c61304..92992a8 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -106,11 +106,11 @@ static void msix_flush_writes(unsigned int irq)
entry = get_irq_msi(irq);
BUG_ON(!entry || !entry->dev);
- switch (entry->msi_attrib.type) {
- case PCI_CAP_ID_MSI:
+ switch (entry->msi_attrib._type) {
+ case MSI_ATTRIB:
/* nothing to do */
break;
- case PCI_CAP_ID_MSIX:
+ case MSIX_ATTRIB:
{
int offset = entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET;
@@ -129,8 +129,8 @@ static void msi_set_mask_bits(unsigned int irq, u32 mask, u32 flag)
entry = get_irq_msi(irq);
BUG_ON(!entry || !entry->dev);
- switch (entry->msi_attrib.type) {
- case PCI_CAP_ID_MSI:
+ switch (entry->msi_attrib._type) {
+ case MSI_ATTRIB:
if (entry->msi_attrib.maskbit) {
int pos;
u32 mask_bits;
@@ -144,7 +144,7 @@ static void msi_set_mask_bits(unsigned int irq, u32 mask, u32 flag)
msi_set_enable(entry->dev, !flag);
}
break;
- case PCI_CAP_ID_MSIX:
+ case MSIX_ATTRIB:
{
int offset = entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET;
@@ -162,8 +162,8 @@ static void msi_set_mask_bits(unsigned int irq, u32 mask, u32 flag)
void read_msi_msg(unsigned int irq, struct msi_msg *msg)
{
struct msi_desc *entry = get_irq_msi(irq);
- switch(entry->msi_attrib.type) {
- case PCI_CAP_ID_MSI:
+ switch(entry->msi_attrib._type) {
+ case MSI_ATTRIB:
{
struct pci_dev *dev = entry->dev;
int pos = entry->msi_attrib.pos;
@@ -182,7 +182,7 @@ void read_msi_msg(unsigned int irq, struct msi_msg *msg)
msg->data = data;
break;
}
- case PCI_CAP_ID_MSIX:
+ case MSIX_ATTRIB:
{
void __iomem *base;
base = entry->mask_base +
@@ -201,11 +201,17 @@ void read_msi_msg(unsigned int irq, struct msi_msg *msg)
void write_msi_msg(unsigned int irq, struct msi_msg *msg)
{
struct msi_desc *entry = get_irq_msi(irq);
- switch (entry->msi_attrib.type) {
- case PCI_CAP_ID_MSI:
+ switch (entry->msi_attrib._type) {
+ case MSI_ATTRIB:
{
struct pci_dev *dev = entry->dev;
int pos = entry->msi_attrib.pos;
+ u16 msgctl;
+
+ pci_read_config_word(dev, msi_control_reg(pos), &msgctl);
+ msgctl &= ~PCI_MSI_FLAGS_QSIZE;
+ msgctl |= entry->msi_attrib.multiple << 4;
+ pci_write_config_word(dev, msi_control_reg(pos), msgctl);
pci_write_config_dword(dev, msi_lower_address_reg(pos),
msg->address_lo);
@@ -220,7 +226,7 @@ void write_msi_msg(unsigned int irq, struct msi_msg *msg)
}
break;
}
- case PCI_CAP_ID_MSIX:
+ case MSIX_ATTRIB:
{
void __iomem *base;
base = entry->mask_base +
@@ -359,7 +365,7 @@ static int msi_capability_init(struct pci_dev *dev)
if (!entry)
return -ENOMEM;
- entry->msi_attrib.type = PCI_CAP_ID_MSI;
+ entry->msi_attrib._type = MSI_ATTRIB;
entry->msi_attrib.is_64 = is_64bit_address(control);
entry->msi_attrib.entry_nr = 0;
entry->msi_attrib.maskbit = is_mask_bit_support(control);
@@ -446,7 +452,7 @@ static int msix_capability_init(struct pci_dev *dev,
break;
j = entries[i].entry;
- entry->msi_attrib.type = PCI_CAP_ID_MSIX;
+ entry->msi_attrib._type = MSIX_ATTRIB;
entry->msi_attrib.is_64 = 1;
entry->msi_attrib.entry_nr = j;
entry->msi_attrib.maskbit = 1;
@@ -589,12 +595,13 @@ void pci_msi_shutdown(struct pci_dev* dev)
u32 mask = entry->msi_attrib.maskbits_mask;
msi_set_mask_bits(dev->irq, mask, ~mask);
}
- if (!entry->dev || entry->msi_attrib.type != PCI_CAP_ID_MSI)
+ if (!entry->dev || entry->msi_attrib._type != MSI_ATTRIB)
return;
/* Restore dev->irq to its default pin-assertion irq */
dev->irq = entry->msi_attrib.default_irq;
}
+
void pci_disable_msi(struct pci_dev* dev)
{
struct msi_desc *entry;
@@ -605,7 +612,7 @@ void pci_disable_msi(struct pci_dev* dev)
pci_msi_shutdown(dev);
entry = list_entry(dev->msi_list.next, struct msi_desc, list);
- if (!entry->dev || entry->msi_attrib.type != PCI_CAP_ID_MSI)
+ if (!entry->dev || entry->msi_attrib._type != MSI_ATTRIB)
return;
msi_free_irqs(dev);
@@ -624,7 +631,7 @@ static int msi_free_irqs(struct pci_dev* dev)
arch_teardown_msi_irqs(dev);
list_for_each_entry_safe(entry, tmp, &dev->msi_list, list) {
- if (entry->msi_attrib.type == PCI_CAP_ID_MSIX) {
+ if (entry->msi_attrib._type == MSIX_ATTRIB) {
writel(1, entry->mask_base + entry->msi_attrib.entry_nr
* PCI_MSIX_ENTRY_SIZE
+ PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
diff --git a/drivers/pci/msi.h b/drivers/pci/msi.h
index 3898f52..b72e0bd 100644
--- a/drivers/pci/msi.h
+++ b/drivers/pci/msi.h
@@ -22,12 +22,8 @@
#define msi_disable(control) control &= ~PCI_MSI_FLAGS_ENABLE
#define multi_msi_capable(control) \
(1 << ((control & PCI_MSI_FLAGS_QMASK) >> 1))
-#define multi_msi_enable(control, num) \
- control |= (((num >> 1) << 4) & PCI_MSI_FLAGS_QSIZE);
#define is_64bit_address(control) (!!(control & PCI_MSI_FLAGS_64BIT))
#define is_mask_bit_support(control) (!!(control & PCI_MSI_FLAGS_MASKBIT))
-#define msi_enable(control, num) multi_msi_enable(control, num); \
- control |= PCI_MSI_FLAGS_ENABLE
#define msix_table_offset_reg(base) (base + 0x04)
#define msix_pba_offset_reg(base) (base + 0x08)
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 8f29392..d322148 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -15,9 +15,13 @@ extern void unmask_msi_irq(unsigned int irq);
extern void read_msi_msg(unsigned int irq, struct msi_msg *msg);
extern void write_msi_msg(unsigned int irq, struct msi_msg *msg);
+#define MSI_ATTRIB 1
+#define MSIX_ATTRIB 2
+
struct msi_desc {
struct {
- __u8 type : 5; /* {0: unused, 5h:MSI, 11h:MSI-X} */
+ __u8 _type : 2; /* {0: unused, 1:MSI, 2:MSI-X} */
+ __u8 multiple: 3; /* log2 number of messages */
__u8 maskbit : 1; /* mask-pending bit supported ? */
__u8 masked : 1;
__u8 is_64 : 1; /* Address size: 0=32bit 1=64bit */
--
1.5.5.4
--
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