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authorRonald G. Minnich <rminnich@gmail.com>2019-10-22 02:02:24 +0000
committerron minnich <rminnich@gmail.com>2020-02-08 18:57:36 +0000
commit466ca2c1adbf2fc97dd559a3b69fcf0c7fe5d472 (patch)
tree24c665b13fe23e8e6be540ef917d1c23ad175309 /src/include
parent91dc1e74a52ec33dc7f5c33dca73f02c5fe54cf0 (diff)
downloadcoreboot-466ca2c1adbf2fc97dd559a3b69fcf0c7fe5d472.tar.xz
Add configurable ramstage support for minimal PCI scanning
This CL has changes that allow us to enable a configurable ramstage, and one change that allows us to minimize PCI scanning. Minimal scanning is a frequently requested feature. To enable it, we add two new variables to src/Kconfig CONFIGURABLE_RAMSTAGE is the overall variable controlling other options for minimizing the ramstage. MINIMAL_PCI_SCANNING is how we indicate we wish to enable minimal PCI scanning. Some devices must be scanned in all cases, such as 0:0.0. To indicate which devices we must scan, we add a new mandatory keyword to sconfig It is used in place of on, off, or hidden, and indicates a device is enabled and mandatory. Mandatory devices are always scanned. When MINIMAL_PCI_SCANNING is enabled, ONLY mandatory devices are scanned. We further add support in src/device/pci_device.c to manage both MINIMAL_PCI_SCANNING and mandatory devices. Finally, to show how this works in practice, we add mandatory keywords to 3 devices on the qemu-q35. TEST= 1. This is tested and working on the qemu-q35 target. 2. On CML-Hatch Before CL: Total Boot time: ~685ms After CL: Total Boot time: ~615ms Change-Id: I2073d9f8e9297c2b02530821ebb634ea2a5c758e Signed-off-by: Ronald G. Minnich <rminnich@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/36221 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Jeremy Soller <jeremy@system76.com>
Diffstat (limited to 'src/include')
-rw-r--r--src/include/device/device.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/include/device/device.h b/src/include/device/device.h
index c3a1106023..333ac5d404 100644
--- a/src/include/device/device.h
+++ b/src/include/device/device.h
@@ -119,7 +119,10 @@ struct device {
unsigned int initialized : 1; /* 1 if we have initialized the device */
unsigned int on_mainboard : 1;
unsigned int disable_pcie_aspm : 1;
- unsigned int hidden : 1; /* set if we should hide from UI */
+ /* set if we should hide from UI */
+ unsigned int hidden : 1;
+ /* set if this device is used even in minimum PCI cases */
+ unsigned int mandatory : 1;
u8 command;
uint16_t hotplug_buses; /* Number of hotplug buses to allocate */