[SeaBIOS] [PATCH v3 4/6] pci: init boot devices only on address space shortage
Gerd Hoffmann
kraxel at redhat.com
Tue Jul 5 17:27:03 CEST 2011
Try to handle address space shortage by skipping any device
which isn't essential for boot.
Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
---
src/pci.c | 3 +++
src/pciinit.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++--
src/util.h | 2 ++
3 files changed, 54 insertions(+), 2 deletions(-)
diff --git a/src/pci.c b/src/pci.c
index 78bbac2..af735b2 100644
--- a/src/pci.c
+++ b/src/pci.c
@@ -193,6 +193,9 @@ pci_find_class(u16 classid)
int pci_init_device(const struct pci_device_id *ids
, struct pci_device *pci, void *arg)
{
+ if (!pci_enable_device(pci))
+ return -1;
+
while (ids->vendid || ids->class_mask) {
if ((ids->vendid == PCI_ANY_ID || ids->vendid == pci->vendor) &&
(ids->devid == PCI_ANY_ID || ids->devid == pci->device) &&
diff --git a/src/pciinit.c b/src/pciinit.c
index aafdf7c..8b95132 100644
--- a/src/pciinit.c
+++ b/src/pciinit.c
@@ -44,6 +44,7 @@ static struct pci_bus {
} r[PCI_REGION_TYPE_COUNT];
} *busses;
static int busses_count;
+static int boot_devices_only = 0;
static void pci_bios_init_device_in_bus(int bus);
static void pci_bios_check_device_in_bus(int bus);
@@ -157,6 +158,40 @@ static const struct pci_device_id pci_isa_bridge_tbl[] = {
#define PCI_PREF_MEMORY_ALIGN (1UL << 20)
#define PCI_PREF_MEMORY_SHIFT 16
+static int is_boot_device(struct pci_device *pci)
+{
+ /* check base class */
+ switch (pci->class >> 8) {
+ case PCI_BASE_CLASS_STORAGE:
+ case PCI_BASE_CLASS_NETWORK:
+ case PCI_BASE_CLASS_BRIDGE:
+ case PCI_BASE_CLASS_SYSTEM:
+ return 1;
+ }
+
+ /* check class */
+ switch (pci->class) {
+ case PCI_CLASS_DISPLAY_VGA:
+ case PCI_CLASS_SERIAL_USB:
+ return 1;
+ }
+
+ /* check if ROM present */
+ if (pci->bars[PCI_ROM_SLOT].addr != 0) {
+ return 1;
+ }
+
+ return 0;
+}
+
+int pci_enable_device(struct pci_device *pci)
+{
+ if (boot_devices_only) {
+ return is_boot_device(pci);
+ }
+ return 1;
+}
+
static void storage_ide_init(struct pci_device *pci, void *arg)
{
u16 bdf = pci->bdf;
@@ -385,6 +420,9 @@ static void pci_bios_check_device(struct pci_bus *bus, struct pci_device *dev)
u32 limit;
int i,type;
+ if (!pci_enable_device(dev))
+ return;
+
if (dev->class == PCI_CLASS_BRIDGE_PCI) {
if (dev->secondary_bus >= busses_count) {
/* should never trigger */
@@ -433,6 +471,9 @@ static void pci_bios_map_device(struct pci_bus *bus, struct pci_device *dev)
u16 bdf = dev->bdf;
int type, i;
+ if (!pci_enable_device(dev))
+ return;
+
if (dev->class == PCI_CLASS_BRIDGE_PCI) {
if (dev->secondary_bus >= busses_count) {
return;
@@ -595,8 +636,14 @@ pci_setup(void)
busses = malloc_tmp(sizeof(*busses) * busses_count);
pci_bios_check_device_in_bus(0 /* host bus */);
if (pci_bios_init_root_regions(start, end) != 0) {
- dprintf(1, "PCI: out of address space\n");
- /* Hmm, what do now? */
+ dprintf(1, "=== PCI new allocation pass #1a (boot only) ===\n");
+ boot_devices_only = 1;
+ memset(busses, 0, busses_count * sizeof(struct pci_bus));
+ pci_bios_check_device_in_bus(0 /* host bus */);
+ if (pci_bios_init_root_regions(start, end) != 0) {
+ dprintf(1, "PCI: out of address space\n");
+ /* Hmm, what do now? */
+ }
}
dprintf(1, "=== PCI new allocation pass #2 ===\n");
diff --git a/src/util.h b/src/util.h
index d856d50..8020181 100644
--- a/src/util.h
+++ b/src/util.h
@@ -347,6 +347,8 @@ void qemu_prep_reset(void);
// pciinit.c
extern const u8 pci_irqs[4];
void pci_setup(void);
+struct pci_device;
+int pci_enable_device(struct pci_device *pci);
// smm.c
void smm_init(void);
--
1.7.1
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