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authorBernardo Perez Priego <bernardo.perez.priego@intel.com>2020-01-14 15:59:19 -0800
committerPatrick Georgi <pgeorgi@google.com>2020-01-18 11:19:49 +0000
commit1d8568c91413c76ee147bf6c09ae87197f7e75d7 (patch)
tree1e879dc796826b428e8576ac5074e9b3d835e265 /src
parent954a5b50ad9d6ee31f0f0d7abe6badf412cbe9cc (diff)
downloadcoreboot-1d8568c91413c76ee147bf6c09ae87197f7e75d7.tar.xz
ec/google/wilco: Set minimum UCSI_ACPI region length
IMD provides support for small and large allocations. Region IMD Small memory is 1 KB with 32 Bytes alignment, this region holds smaller entries without having to reserve a whole 4 KB page. Remaining space is assigned to IMD Large to hold various regions with 4 KB alignment. The UCSI kernel (kernel version 4.19) driver maps the UCSI_ACPI memory as not cached. Cache mapping is set on page boundaries and all IMD Small is within the same page. If another driver maps the memory as write-back before the UCSI driver is loaded then the UCSI driver will fail to map the memory as not cached. Placing UCSI_ACPI in IMD Large region will prevent this mapping issue since it will now be located within its own page. This patch will force UCSI_ACPI region to be located in IMD Large region. BUG=b:144826008 Signed-off-by: Bernardo Perez Priego <bernardo.perez.priego@intel.com> Change-Id: Id00e76dca240279773a95c8054831e05df390664 Reviewed-on: https://review.coreboot.org/c/coreboot/+/38414 Reviewed-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-by: Mathew King <mathewk@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src')
-rw-r--r--src/ec/google/wilco/chip.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/src/ec/google/wilco/chip.c b/src/ec/google/wilco/chip.c
index 70e612442c..b44cbd6c64 100644
--- a/src/ec/google/wilco/chip.c
+++ b/src/ec/google/wilco/chip.c
@@ -28,6 +28,11 @@
#include "chip.h"
/*
+ * Setting minimum length of UCSI_ACPI will ensure this region is placed out of IMD Small.
+ * Having this region out of IMD Small will prevent any memory mapping conflicts.
+ */
+#define UCSI_MIN_ALLOC_REGION_LEN CBMEM_SM_ROOT_SIZE
+/*
* The UCSI fields are defined in the UCSI specification at
* https://www.intel.com/content/www/us/en/io/universal-serial-bus/usb-type-c-ucsi-spec.html
* https://www.intel.com/content/www/us/en/io/universal-serial-bus/bios-implementation-of-ucsi.html
@@ -175,19 +180,22 @@ static void wilco_ec_fill_ssdt_generator(struct device *dev)
{
struct opregion opreg;
void *region_ptr;
+ size_t ucsi_alloc_region_len;
if (!dev->enabled)
return;
- region_ptr = cbmem_add(CBMEM_ID_ACPI_UCSI, ucsi_region_len);
+ ucsi_alloc_region_len = ucsi_region_len < UCSI_MIN_ALLOC_REGION_LEN ?
+ UCSI_MIN_ALLOC_REGION_LEN : ucsi_region_len;
+ region_ptr = cbmem_add(CBMEM_ID_ACPI_UCSI, ucsi_alloc_region_len);
if (!region_ptr)
return;
- memset(region_ptr, 0, ucsi_region_len);
+ memset(region_ptr, 0, ucsi_alloc_region_len);
opreg.name = "UCSM";
opreg.regionspace = SYSTEMMEMORY;
opreg.regionoffset = (uintptr_t)region_ptr;
- opreg.regionlen = ucsi_region_len;
+ opreg.regionlen = ucsi_alloc_region_len;
acpigen_write_scope(acpi_device_path_join(dev, "UCSI"));
acpigen_write_name("_CRS");