[PATCH 06/16] Support for device capability

Sheng Yang
2009-03-12T13:37:06Z

This framework can be easily extended to support device capability, like
MSI/MSI-x.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
---
qemu/hw/pci.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-
qemu/hw/pci.h | 29 +++++++++++++++++++++
2 files changed, 104 insertions(+), 2 deletions(-)

diff --git a/qemu/hw/pci.c b/qemu/hw/pci.c
index 821646c..eca0517 100644
--- a/qemu/hw/pci.c
+++ b/qemu/hw/pci.c
@@ -427,8 +427,8 @@ static void pci_update_mappings(PCIDevice *d)
}
}

-uint32_t pci_default_read_config(PCIDevice *d,
- uint32_t address, int len)
+static uint32_t pci_read_config(PCIDevice *d,
+ uint32_t address, int len)
{
uint32_t val;

@@ -453,6 +453,45 @@ uint32_t pci_default_read_config(PCIDevice *d,
return val;
}

+static void pci_write_config(PCIDevice *pci_dev,
+ uint32_t address, uint32_t val, int len)
+{
+ int i;
+ for (i = 0; i < len; i++) {
+ pci_dev->config[address + i] = val & 0xff;
+ val >>= 8;
+ }
+}
+
+int pci_access_cap_config(PCIDevice *pci_dev, uint32_t address, int len)
+{
+ if (pci_dev->cap.supported && address >= pci_dev->cap.start &&
+ (address + len) < pci_dev->cap.start + pci_dev->cap.length)
+ return 1;
+ return 0;
+}
+
+uint32_t pci_default_cap_read_config(PCIDevice *pci_dev,
+ uint32_t address, int len)
+{
+ return pci_read_config(pci_dev, address, len);
+}
+
+void pci_default_cap_write_config(PCIDevice *pci_dev,
+ uint32_t address, uint32_t val, int len)
+{
+ pci_write_config(pci_dev, address, val, len);
+}
+
+uint32_t pci_default_read_config(PCIDevice *d,
+ uint32_t address, int len)
+{
+ if (pci_access_cap_config(d, address, len))
+ return d->cap.config_read(d, address, len);
+
+ return pci_read_config(d, address, len);
+}
+
void pci_default_write_config(PCIDevice *d,
uint32_t address, uint32_t val, int len)
{
@@ -485,6 +524,11 @@ void pci_default_write_config(PCIDevice *d,
return;
}
default_config:
+ if (pci_access_cap_config(d, address, len)) {
+ d->cap.config_write(d, address, val, len);
+ return;
+ }
+
/* not efficient, but simple */
addr = address;
for(i = 0; i < len; i++) {
@@ -905,3 +949,32 @@ PCIBus *pci_bridge_init(PCIBus *bus, int devfn, uint16_t vid, uint16_t did,
s->bus = pci_register_secondary_bus(&s->dev, map_irq);
return s->bus;
}
+
+int pci_enable_capability_support(PCIDevice *pci_dev,
+ uint32_t config_start,
+ PCICapConfigReadFunc *config_read,
+ PCICapConfigWriteFunc *config_write,
+ PCICapConfigInitFunc *config_init)
+{
+ if (!pci_dev)
+ return -ENODEV;
+
+ if (config_start == 0)
+ pci_dev->cap.start = PCI_CAPABILITY_CONFIG_DEFAULT_START_ADDR;
+ else if (config_start >= 0x40 && config_start < 0xff)
+ pci_dev->cap.start = config_start;
+ else
+ return -EINVAL;
+
+ if (config_read)
+ pci_dev->cap.config_read = config_read;
+ else
+ pci_dev->cap.config_read = pci_default_cap_read_config;
+ if (config_write)
+ pci_dev->cap.config_write = config_write;
+ else
+ pci_dev->cap.config_write = pci_default_cap_write_config;
+ pci_dev->cap.supported = 1;
+ pci_dev->config[PCI_CAPABILITY_LIST] = pci_dev->cap.start;
+ return config_init(pci_dev);
+}
diff --git a/qemu/hw/pci.h b/qemu/hw/pci.h
index 2327215..127dbed 100644
--- a/qemu/hw/pci.h
+++ b/qemu/hw/pci.h
@@ -139,6 +139,12 @@ typedef void PCIMapIORegionFunc(PCIDevice *pci_dev, int region_num,
uint32_t addr, uint32_t size, int type);
typedef int PCIUnregisterFunc(PCIDevice *pci_dev);

+typedef void PCICapConfigWriteFunc(PCIDevice *pci_dev,
+ uint32_t address, uint32_t val, int len);
+typedef uint32_t PCICapConfigReadFunc(PCIDevice *pci_dev,
+ uint32_t address, int len);
+typedef int PCICapConfigInitFunc(PCIDevice *pci_dev);
+
#define PCI_ADDRESS_SPACE_MEM 0x00
#define PCI_ADDRESS_SPACE_IO 0x01
#define PCI_ADDRESS_SPACE_MEM_PREFETCH 0x08
@@ -197,6 +203,10 @@ typedef struct PCIIORegion {

#define PCI_COMMAND_RESERVED_MASK_HI (PCI_COMMAND_RESERVED >> 8)

+#define PCI_CAPABILITY_CONFIG_MAX_LENGTH 0x60
+#define PCI_CAPABILITY_CONFIG_DEFAULT_START_ADDR 0x40
+#define PCI_CAPABILITY_CONFIG_MSI_LENGTH 0x10
+
struct PCIDevice {
/* PCI config space */
uint8_t config[256];
@@ -219,6 +229,14 @@ struct PCIDevice {

/* Current IRQ levels. Used internally by the generic PCI code. */
int irq_state[4];
+
+ /* Device capability configuration space */
+ struct {
+ int supported;
+ unsigned int start, length;
+ PCICapConfigReadFunc *config_read;
+ PCICapConfigWriteFunc *config_write;
+ } cap;
};

PCIDevice *pci_register_device(PCIBus *bus, const char *name,
@@ -231,6 +249,12 @@ void pci_register_io_region(PCIDevice *pci_dev, int region_num,
uint32_t size, int type,
PCIMapIORegionFunc *map_func);

+int pci_enable_capability_support(PCIDevice *pci_dev,
+ uint32_t config_start,
+ PCICapConfigReadFunc *config_read,
+ PCICapConfigWriteFunc *config_write,
+ PCICapConfigInitFunc *config_init);
+
int pci_map_irq(PCIDevice *pci_dev, int pin);
uint32_t pci_default_read_config(PCIDevice *d,
uint32_t address, int len);
@@ -238,6 +262,11 @@ void pci_default_write_config(PCIDevice *d,
uint32_t address, uint32_t val, int len);
void pci_device_save(PCIDevice *s, QEMUFile *f);
int pci_device_load(PCIDevice *s, QEMUFile *f);
+uint32_t pci_default_cap_read_config(PCIDevice *pci_dev,
+ uint32_t address, int len);
+void pci_default_cap_write_config(PCIDevice *pci_dev,
+ uint32_t address, uint32_t val, int len);
+int pci_access_cap_config(PCIDevice *pci_dev, uint32_t address, int len);

typedef void (*pci_set_irq_fn)(qemu_irq *pic, int irq_num, int level);
typedef int (*pci_map_irq_fn)(PCIDevice *pci_dev, int irq_num);
--
1.5.4.5