Ok, I'm very sorry for wasting people's time on this. In the end, I
agree that the MSI code should stay as is. It's just to complex and
confusing to enable it always for all devices at this time. I'll put
the pci_enable/pci_disable idea on my TODO list to try to help out with
some of the logic that every-other pci driver seems to have to duplicate
all the time. That seems like the best way forward.
So, here's a patch to try to make up for starting this discussion in the
first place. It's a small cleanup to the MSI code to help make the irq
handling logic a bit easier to follow and understand (it also reduces
the size of the compiled code as a nice side benefit:
text data bss dec hex filename
7543 136 972 8651 21cb drivers/pci/msi.o - before patch
7482 136 972 8590 218e drivers/pci/msi.o - after patch
Hey, every byte counts :)
I'm adding this to my pci tree and it will show up in the -mm tree
eventually.
thanks,
greg k-h
------------------
PCI: clean up the MSI code a bit.
Mostly just cleans up the irq handling logic to be smaller and a bit more
descriptive as to what it really does.
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/pci/msi.c | 88 ++++++++++++++++++++----------------------------------
drivers/pci/msi.h | 9 ++---
2 files changed, 37 insertions(+), 60 deletions(-)
--- gregkh-2.6.orig/drivers/pci/msi.c 2005-06-07 22:38:01.000000000 -0700
+++ gregkh-2.6/drivers/pci/msi.c 2005-06-07 23:12:29.000000000 -0700
@@ -28,10 +28,10 @@
static kmem_cache_t* msi_cachep;
static int pci_msi_enable = 1;
-static int last_alloc_vector = 0;
-static int nr_released_vectors = 0;
+static int last_alloc_vector;
+static int nr_released_vectors;
static int nr_reserved_vectors = NR_HP_RESERVED_VECTORS;
-static int nr_msix_devices = 0;
+static int nr_msix_devices;
#ifndef CONFIG_X86_IO_APIC
int vector_irq[NR_VECTORS] = { [0 ... NR_VECTORS - 1] = -1};
@@ -170,44 +170,30 @@
return 0; /* never anything pending */
}
-static void release_msi(unsigned int vector);
-static void shutdown_msi_irq(unsigned int vector)
-{
- release_msi(vector);
-}
-
-#define shutdown_msi_irq_wo_maskbit shutdown_msi_irq
-static void enable_msi_irq_wo_maskbit(unsigned int vector) {}
-static void disable_msi_irq_wo_maskbit(unsigned int vector) {}
-static void ack_msi_irq_wo_maskbit(unsigned int vector) {}
-static void end_msi_irq_wo_maskbit(unsigned int vector)
+static unsigned int startup_msi_irq_w_maskbit(unsigned int vector)
{
- move_msi(vector);
- ack_APIC_irq();
+ startup_msi_irq_wo_maskbit(vector);
+ unmask_MSI_irq(vector);
+ return 0; /* never anything pending */
}
-static unsigned int startup_msi_irq_w_maskbit(unsigned int vector)
+static void shutdown_msi_irq(unsigned int vector)
{
struct msi_desc *entry;
unsigned long flags;
spin_lock_irqsave(&msi_lock, flags);
entry = msi_desc[vector];
- if (!entry || !entry->dev) {
- spin_unlock_irqrestore(&msi_lock, flags);
- return 0;
- }
- entry->msi_attrib.state = 1; /* Mark it active */
+ if (entry && entry->dev)
+ entry->msi_attrib.state = 0; /* Mark it not active */
spin_unlock_irqrestore(&msi_lock, flags);
-
- unmask_MSI_irq(vector);
- return 0; /* never anything pending */
}
-#define shutdown_msi_irq_w_maskbit shutdown_msi_irq
-#define enable_msi_irq_w_maskbit unmask_MSI_irq
-#define disable_msi_irq_w_maskbit mask_MSI_irq
-#define ack_msi_irq_w_maskbit mask_MSI_irq
+static void end_msi_irq_wo_maskbit(unsigned int vector)
+{
+ move_msi(vector);
+ ack_APIC_irq();
+}
static void end_msi_irq_w_maskbit(unsigned int vector)
{
@@ -216,6 +202,10 @@
ack_APIC_irq();
}
+static void do_nothing(unsigned int vector)
+{
+}
+
/*
* Interrupt Type for MSI-X PCI/PCI-X/PCI-Express Devices,
* which implement the MSI-X Capability Structure.
@@ -223,10 +213,10 @@
static struct hw_interrupt_type msix_irq_type = {
.typename = "PCI-MSI-X",
.startup = startup_msi_irq_w_maskbit,
- .shutdown = shutdown_msi_irq_w_maskbit,
- .enable = enable_msi_irq_w_maskbit,
- .disable = disable_msi_irq_w_maskbit,
- .ack = ack_msi_irq_w_maskbit,
+ .shutdown = shutdown_msi_irq,
+ .enable = unmask_MSI_irq,
+ .disable = mask_MSI_irq,
+ .ack = mask_MSI_irq,
.end = end_msi_irq_w_maskbit,
.set_affinity = set_msi_irq_affinity
};
@@ -239,10 +229,10 @@
static struct hw_interrupt_type msi_irq_w_maskbit_type = {
.typename = "PCI-MSI",
.startup = startup_msi_irq_w_maskbit,
- .shutdown = shutdown_msi_irq_w_maskbit,
- .enable = enable_msi_irq_w_maskbit,
- .disable = disable_msi_irq_w_maskbit,
- .ack = ack_msi_irq_w_maskbit,
+ .shutdown = shutdown_msi_irq,
+ .enable = unmask_MSI_irq,
+ .disable = mask_MSI_irq,
+ .ack = mask_MSI_irq,
.end = end_msi_irq_w_maskbit,
.set_affinity = set_msi_irq_affinity
};
@@ -255,10 +245,10 @@
static struct hw_interrupt_type msi_irq_wo_maskbit_type = {
.typename = "PCI-MSI",
.startup = startup_msi_irq_wo_maskbit,
- .shutdown = shutdown_msi_irq_wo_maskbit,
- .enable = enable_msi_irq_wo_maskbit,
- .disable = disable_msi_irq_wo_maskbit,
- .ack = ack_msi_irq_wo_maskbit,
+ .shutdown = shutdown_msi_irq,
+ .enable = do_nothing,
+ .disable = do_nothing,
+ .ack = do_nothing,
.end = end_msi_irq_wo_maskbit,
.set_affinity = set_msi_irq_affinity
};
@@ -407,7 +397,7 @@
{
struct msi_desc *entry;
- entry = (struct msi_desc*) kmem_cache_alloc(msi_cachep, SLAB_KERNEL);
+ entry = kmem_cache_alloc(msi_cachep, SLAB_KERNEL);
if (!entry)
return NULL;
@@ -796,18 +786,6 @@
}
}
-static void release_msi(unsigned int vector)
-{
- struct msi_desc *entry;
- unsigned long flags;
-
- spin_lock_irqsave(&msi_lock, flags);
- entry = msi_desc[vector];
- if (entry && entry->dev)
- entry->msi_attrib.state = 0; /* Mark it not active */
- spin_unlock_irqrestore(&msi_lock, flags);
-}
-
static int msi_free_vector(struct pci_dev* dev, int vector, int reassign)
{
struct msi_desc *entry;
@@ -924,7 +902,7 @@
/**
* pci_enable_msix - configure device's MSI-X capability structure
* @dev: pointer to the pci_dev data structure of MSI-X device function
- * @data: pointer to an array of MSI-X entries
+ * @entries: pointer to an array of MSI-X entries
* @nvec: number of MSI-X vectors requested for allocation by device driver
*
* Setup the MSI-X capability structure of device function with the number
--- gregkh-2.6.orig/drivers/pci/msi.h 2005-03-01 23:38:13.000000000 -0800
+++ gregkh-2.6/drivers/pci/msi.h 2005-06-07 23:10:43.000000000 -0700
@@ -41,11 +41,11 @@
#define PCI_MSIX_FLAGS_BIRMASK (7 << 0)
#define PCI_MSIX_FLAGS_BITMASK (1 << 0)
-#define PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET 0
-#define PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET 4
-#define PCI_MSIX_ENTRY_DATA_OFFSET 8
-#define PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET 12
#define PCI_MSIX_ENTRY_SIZE 16
+#define PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET 0
+#define PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET 4
+#define PCI_MSIX_ENTRY_DATA_OFFSET 8
+#define PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET 12
#define msi_control_reg(base) (base + PCI_MSI_FLAGS)
#define msi_lower_address_reg(base) (base + PCI_MSI_ADDRESS_LO)
@@ -64,7 +64,6 @@
#define msi_enable(control, num) multi_msi_enable(control, num); \
control |= PCI_MSI_FLAGS_ENABLE
-#define msix_control_reg msi_control_reg
#define msix_table_offset_reg(base) (base + 0x04)
#define msix_pba_offset_reg(base) (base + 0x08)
#define msix_enable(control) control |= PCI_MSIX_FLAGS_ENABLE
-
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