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[PATCH] PCI: clean up the MSI code a bit.
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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 <gregkh@suse.de>
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Greg Kroah-Hartman committed Jun 28, 2005
1 parent bb4a61b commit 70549ad
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Showing 2 changed files with 37 additions and 60 deletions.
88 changes: 33 additions & 55 deletions drivers/pci/msi.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -28,10 +28,10 @@ static struct msi_desc* msi_desc[NR_IRQS] = { [0 ... NR_IRQS-1] = NULL };
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};
Expand Down Expand Up @@ -170,44 +170,30 @@ static unsigned int startup_msi_irq_wo_maskbit(unsigned int vector)
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)
{
Expand All @@ -216,17 +202,21 @@ static void end_msi_irq_w_maskbit(unsigned int vector)
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.
*/
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
};
Expand All @@ -239,10 +229,10 @@ static struct hw_interrupt_type msix_irq_type = {
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
};
Expand All @@ -255,10 +245,10 @@ static struct hw_interrupt_type msi_irq_w_maskbit_type = {
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
};
Expand Down Expand Up @@ -407,7 +397,7 @@ static struct msi_desc* alloc_msi_entry(void)
{
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;

Expand Down Expand Up @@ -796,18 +786,6 @@ void pci_disable_msi(struct pci_dev* dev)
}
}

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;
Expand Down Expand Up @@ -924,7 +902,7 @@ static int reroute_msix_table(int head, struct msix_entry *entries, int *nvec)
/**
* 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
Expand Down
9 changes: 4 additions & 5 deletions drivers/pci/msi.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -41,11 +41,11 @@ static inline void move_msi(int vector) {}
#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)
Expand All @@ -64,7 +64,6 @@ static inline void move_msi(int vector) {}
#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
Expand Down

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