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pciexp_device: Add option to allocate prefetch memory above 4G boundary 

This change adds a Kconfig option to request allocation of prefetch
memory for hotplug devices above the 4G boundary. In order to
select this option by default and still allow users to disable this if
required, another option is added to request allocation of prefetch
memory below 4G boundary which defaults to n but can be overriden
by mainboards.

Without this change, if the number of pciexp bridges supporting
hot-plug is more than 4 or if the reserved prefetch memory size for
hot-plug cases was increased, then the resource allocator would fail
to satisfy the resource requirement below 4G boundary.

BUG=b:149186922
TEST=Enabled resource allocation above 4G for prefetch memory on volteer
and verified that it gets allocated above 4G boundary.

Signed-off-by: Furquan Shaikh <furquan@google.com>
Change-Id: I061d935eef9fcda352230b03b5cf14e467924e50
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39489
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Furquan Shaikh 2020-03-12 17:58:13 -07:00 committed by Patrick Georgi
parent 871baf2230
commit dcbf6454b6
2 changed files with 22 additions and 3 deletions
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15
src/device/Kconfig
View File

@ -585,6 +585,21 @@ config PCIEXP_HOTPLUG_PREFETCH_MEM
child devices. This size should be page-aligned. The default is
256 MiB.
config PCIEXP_HOTPLUG_PREFETCH_MEM_ABOVE_4G
bool
default y if !PCIEXP_HOTPLUG_PREFETCH_MEM_BELOW_4G
default n
help
This enables prefetch memory allocation above 4G boundary for the
hotplug resources.
config PCIEXP_HOTPLUG_PREFETCH_MEM_BELOW_4G
bool "PCI Express Hotplug Prefetch Memory Allocation below 4G boundary"
default n
help
This enables prefetch memory allocation below 4G boundary for the
hotplug resources.
config PCIEXP_HOTPLUG_IO
hex "PCI Express Hotplug I/O Space"
default 0x2000

10
src/device/pciexp_device.c
View File

@ -512,7 +512,7 @@ static void pciexp_hotplug_dummy_read_resources(struct device *dev)
{
struct resource *resource;
// Add extra memory space
/* Add extra memory space */
resource = new_resource(dev, 0x10);
resource->size = CONFIG_PCIEXP_HOTPLUG_MEM;
resource->align = 12;
@ -520,7 +520,7 @@ static void pciexp_hotplug_dummy_read_resources(struct device *dev)
resource->limit = 0xffffffff;
resource->flags |= IORESOURCE_MEM;
// Add extra prefetchable memory space
/* Add extra prefetchable memory space */
resource = new_resource(dev, 0x14);
resource->size = CONFIG_PCIEXP_HOTPLUG_PREFETCH_MEM;
resource->align = 12;
@ -528,7 +528,11 @@ static void pciexp_hotplug_dummy_read_resources(struct device *dev)
resource->limit = 0xffffffffffffffff;
resource->flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
// Add extra I/O space
/* Set resource flag requesting allocation above 4G boundary. */
if (CONFIG(PCIEXP_HOTPLUG_PREFETCH_MEM_ABOVE_4G))
resource->flags |= IORESOURCE_ABOVE_4G;
/* Add extra I/O space */
resource = new_resource(dev, 0x18);
resource->size = CONFIG_PCIEXP_HOTPLUG_IO;
resource->align = 12;