[SeaBIOS] [PATCH 10/12] Calculate pci region stats on demand
Alexey Korolev
alexey.korolev at endace.com
Tue Apr 24 08:23:53 CEST 2012
Do not store pci region stats - instead calulate the
sum and alignment on demand.
Signed-off-by: Alexey Korolev <alexey.korolev at endace.com>
---
src/pciinit.c | 57
+++++++++++++++++++++++++++++++++++----------------------
1 files changed, 35 insertions(+), 22 deletions(-)
diff --git a/src/pciinit.c b/src/pciinit.c
index 0d66dbe..a6cf98b 100644
--- a/src/pciinit.c
+++ b/src/pciinit.c
@@ -40,8 +40,6 @@ struct pci_region_entry {
};
struct pci_region {
- /* pci region stats */
- u64 sum, align;
/* pci region assignments */
u64 base;
struct pci_region_entry *list;
@@ -369,6 +367,25 @@ static int pci_bios_bridge_region_is64(struct
pci_region *r,
return 1;
}
+static u64 pci_region_align(struct pci_region *r)
+{
+ if (!r->list)
+ return 1;
+ // The first entry in the sorted list has the largest alignment
+ return r->list->align;
+}
+
+static u64 pci_region_sum(struct pci_region *r)
+{
+ struct pci_region_entry *entry = r->list;
+ u64 sum = 0;
+ while (entry) {
+ sum += entry->size;
+ entry = entry->next;
+ }
+ return sum;
+}
+
static struct pci_region_entry *
pci_region_create_entry(struct pci_bus *bus, struct pci_device *dev,
int bar, u64 size, u64 align, int type, int
is64)
@@ -394,10 +411,6 @@ pci_region_create_entry(struct pci_bus *bus, struct
pci_device *dev,
}
entry->next = *pprev;
*pprev = entry;
-
- bus->r[type].sum += size;
- if (bus->r[type].align < align)
- bus->r[type].align = align;
return entry;
}
@@ -446,9 +459,9 @@ static int pci_bios_check_devices(struct pci_bus
*busses)
for (type = 0; type < PCI_REGION_TYPE_COUNT; type++) {
u64 align = (type == PCI_REGION_TYPE_IO) ?
PCI_BRIDGE_IO_MIN : PCI_BRIDGE_MEM_MIN;
- if (s->r[type].align > align)
- align = s->r[type].align;
- u64 size = ALIGN(s->r[type].sum, align);
+ if (pci_region_align(&s->r[type]) > align)
+ align = pci_region_align(&s->r[type]);
+ u64 size = ALIGN(pci_region_sum(&s->r[type]), align);
int is64 = pci_bios_bridge_region_is64(&s->r[type],
s->bus_dev, type);
// entry->bar is -1 if the entry represents a bridge region
@@ -464,26 +477,26 @@ static int pci_bios_check_devices(struct pci_bus
*busses)
return 0;
}
-#define ROOT_BASE(top, sum, align) ALIGN_DOWN((top)-(sum),(align) ?: 1)
-
// Setup region bases (given the regions' size and alignment)
static void pci_bios_init_root_regions(struct pci_bus *bus)
{
- u64 start = BUILD_PCIMEM_START;
- u64 end = BUILD_PCIMEM_END;
-
bus->r[PCI_REGION_TYPE_IO].base = 0xc000;
- int reg1 = PCI_REGION_TYPE_PREFMEM, reg2 = PCI_REGION_TYPE_MEM;
- if (bus->r[reg1].align < bus->r[reg2].align) {
+ struct pci_region *r_end = &bus->r[PCI_REGION_TYPE_PREFMEM];
+ struct pci_region *r_start = &bus->r[PCI_REGION_TYPE_MEM];
+
+ if (pci_region_align(r_start) < pci_region_align(r_end)) {
// Swap regions to improve alignment.
- reg1 = PCI_REGION_TYPE_MEM;
- reg2 = PCI_REGION_TYPE_PREFMEM;
+ r_end = r_start;
+ r_start = &bus->r[PCI_REGION_TYPE_PREFMEM];
}
- bus->r[reg2].base = ROOT_BASE(end, bus->r[reg2].sum,
bus->r[reg2].align);
- bus->r[reg1].base = ROOT_BASE(bus->r[reg2].base, bus->r[reg1].sum
- , bus->r[reg1].align);
- if (bus->r[reg1].base < start)
+ r_end->base = ALIGN_DOWN((BUILD_PCIMEM_END -
pci_region_sum(r_end)),
+ pci_region_align(r_end));
+ r_start->base = ALIGN_DOWN((r_end->base - pci_region_sum(r_start)),
+ pci_region_align(r_start));
+
+ if ((r_start->base < BUILD_PCIMEM_START) ||
+ (r_start->base > BUILD_PCIMEM_END))
// Memory range requested is larger than available.
panic("PCI: out of address space\n");
}
--
1.7.5.4
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