cpu/amd/mtrr: Remove topmem global variables

The comments are not correct anymore. With AGESA there is no need to
synchronize TOM_MEMx msr's between AP's. It's also not the best place
to do so anyway.

Change-Id: Iecbe1553035680b7c3780338070b852606d74d15
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58693
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

8 files changed, 16 insertions, 82 deletions

diff --git a/src/cpu/amd/mtrr/amd_mtrr.c b/src/cpu/amd/mtrr/amd_mtrr.c
index 7502ca83ff..d17eedd919 100644
--- a/src/cpu/amd/mtrr/amd_mtrr.c
+++ b/src/cpu/amd/mtrr/amd_mtrr.c
@@ -3,54 +3,11 @@
 #include <amdblocks/biosram.h>
 #include <console/console.h>
 #include <device/device.h>
-#include <arch/cpu.h>
-#include <cpu/cpu.h>
-#include <cpu/x86/mtrr.h>
-#include <cpu/x86/msr.h>
 #include <cpu/amd/mtrr.h>
-#include <cpu/x86/cache.h>
-
-/* These will likely move to some device node or cbmem. */
-static uint64_t amd_topmem = 0;
-static uint64_t amd_topmem2 = 0;
-
-uint64_t bsp_topmem(void)
-{
-	return amd_topmem;
-}
-
-uint64_t bsp_topmem2(void)
-{
-	return amd_topmem2;
-}
-
-/* Take a copy of BSP CPUs TOP_MEM and TOP_MEM2 registers,
- * so they can be distributed to AP CPUs. Not strictly MTRRs,
- * but this is not that bad a place to have this code.
- */
-void setup_bsp_ramtop(void)
-{
-	msr_t msr, msr2;
-
-	/* TOP_MEM: the top of DRAM below 4G */
-	msr = rdmsr(TOP_MEM);
-	printk(BIOS_INFO,
-	    "%s, TOP MEM: msr.lo = 0x%08x, msr.hi = 0x%08x\n",
-	     __func__, msr.lo, msr.hi);
-
-	/* TOP_MEM2: the top of DRAM above 4G */
-	msr2 = rdmsr(TOP_MEM2);
-	printk(BIOS_INFO,
-	    "%s, TOP MEM2: msr.lo = 0x%08x, msr.hi = 0x%08x\n",
-	     __func__, msr2.lo, msr2.hi);
-
-	amd_topmem = (uint64_t) msr.hi << 32 | msr.lo;
-	amd_topmem2 = (uint64_t) msr2.hi << 32 | msr2.lo;
-}
 
 void add_uma_resource_below_tolm(struct device *nb, int idx)
 {
-	uint32_t topmem = bsp_topmem();
+	uint32_t topmem = amd_topmem();
 	uint32_t top_of_cacheable = restore_top_of_low_cacheable();
 
 	if (top_of_cacheable == topmem)
diff --git a/src/include/cpu/amd/mtrr.h b/src/include/cpu/amd/mtrr.h
index 9a943ac64f..6fe1628bc0 100644
--- a/src/include/cpu/amd/mtrr.h
+++ b/src/include/cpu/amd/mtrr.h
@@ -66,10 +66,16 @@ static __always_inline void wrmsr_amd(unsigned int index, msr_t msr)
 		);
 }
 
-/* To distribute topmem MSRs to APs. */
-void setup_bsp_ramtop(void);
-uint64_t bsp_topmem(void);
-uint64_t bsp_topmem2(void);
+static inline uint64_t amd_topmem(void)
+{
+	return rdmsr(TOP_MEM).lo;
+}
+
+static inline uint64_t amd_topmem2(void)
+{
+	msr_t msr = rdmsr(TOP_MEM2);
+	return (uint64_t)msr.hi << 32 | msr.lo;
+}
 #endif
 
 #endif /* CPU_AMD_MTRR_H */
diff --git a/src/northbridge/amd/agesa/family14/northbridge.c b/src/northbridge/amd/agesa/family14/northbridge.c
index 4aed96b50e..4b4ab679d9 100644
--- a/src/northbridge/amd/agesa/family14/northbridge.c
+++ b/src/northbridge/amd/agesa/family14/northbridge.c
@@ -818,13 +818,6 @@ static struct device_operations cpu_bus_ops = {
 
 static void root_complex_enable_dev(struct device *dev)
 {
-	static int done = 0;
-
-	if (!done) {
-		setup_bsp_ramtop();
-		done = 1;
-	}
-
 	/* Set the operations if it is a special bus type */
 	if (dev->path.type == DEVICE_PATH_DOMAIN) {
 		dev->ops = &pci_domain_ops;
diff --git a/src/northbridge/amd/agesa/family15tn/northbridge.c b/src/northbridge/amd/agesa/family15tn/northbridge.c
index fe567362f8..bd0a5c8e86 100644
--- a/src/northbridge/amd/agesa/family15tn/northbridge.c
+++ b/src/northbridge/amd/agesa/family15tn/northbridge.c
@@ -737,7 +737,7 @@ static void domain_set_resources(struct device *dev)
 				sizek = 0;
 			}
 			else {
-				uint64_t topmem2 = bsp_topmem2();
+				uint64_t topmem2 = amd_topmem2();
 				basek = 4*1024*1024;
 				sizek = topmem2/1024 - basek;
 			}
@@ -900,13 +900,6 @@ static struct device_operations cpu_bus_ops = {
 
 static void root_complex_enable_dev(struct device *dev)
 {
-	static int done = 0;
-
-	if (!done) {
-		setup_bsp_ramtop();
-		done = 1;
-	}
-
 	/* Set the operations if it is a special bus type */
 	if (dev->path.type == DEVICE_PATH_DOMAIN) {
 		dev->ops = &pci_domain_ops;
diff --git a/src/northbridge/amd/agesa/family16kb/northbridge.c b/src/northbridge/amd/agesa/family16kb/northbridge.c
index 21b4d69647..3d5313a333 100644
--- a/src/northbridge/amd/agesa/family16kb/northbridge.c
+++ b/src/northbridge/amd/agesa/family16kb/northbridge.c
@@ -750,7 +750,7 @@ static void domain_set_resources(struct device *dev)
 				sizek = 0;
 			}
 			else {
-				uint64_t topmem2 = bsp_topmem2();
+				uint64_t topmem2 = amd_topmem2();
 				basek = 4*1024*1024;
 				sizek = topmem2/1024 - basek;
 			}
@@ -922,13 +922,6 @@ static struct device_operations cpu_bus_ops = {
 
 static void root_complex_enable_dev(struct device *dev)
 {
-	static int done = 0;
-
-	if (!done) {
-		setup_bsp_ramtop();
-		done = 1;
-	}
-
 	/* Set the operations if it is a special bus type */
 	if (dev->path.type == DEVICE_PATH_DOMAIN) {
 		dev->ops = &pci_domain_ops;
diff --git a/src/northbridge/amd/pi/00730F01/northbridge.c b/src/northbridge/amd/pi/00730F01/northbridge.c
index f1c5e23657..332bf1ac2a 100644
--- a/src/northbridge/amd/pi/00730F01/northbridge.c
+++ b/src/northbridge/amd/pi/00730F01/northbridge.c
@@ -770,7 +770,7 @@ static void domain_read_resources(struct device *dev)
 	pci_domain_read_resources(dev);
 
 	/* TOP_MEM MSR is our boundary between DRAM and MMIO under 4G */
-	mmio_basek = bsp_topmem() >> 10;
+	mmio_basek = amd_topmem() >> 10;
 
 #if CONFIG_HW_MEM_HOLE_SIZEK != 0
 	/* if the hw mem hole is already set in raminit stage, here we will compare
@@ -826,7 +826,7 @@ static void domain_read_resources(struct device *dev)
 				sizek = 0;
 			}
 			else {
-				uint64_t topmem2 = bsp_topmem2();
+				uint64_t topmem2 = amd_topmem2();
 				basek = 4*1024*1024;
 				sizek = topmem2/1024 - basek;
 			}
@@ -995,13 +995,6 @@ static struct device_operations cpu_bus_ops = {
 
 static void root_complex_enable_dev(struct device *dev)
 {
-	static int done = 0;
-
-	if (!done) {
-		setup_bsp_ramtop();
-		done = 1;
-	}
-
 	/* Set the operations if it is a special bus type */
 	if (dev->path.type == DEVICE_PATH_DOMAIN) {
 		dev->ops = &pci_domain_ops;
diff --git a/src/soc/amd/stoneyridge/chip.c b/src/soc/amd/stoneyridge/chip.c
index 5cc52b6926..666deda7d4 100644
--- a/src/soc/amd/stoneyridge/chip.c
+++ b/src/soc/amd/stoneyridge/chip.c
@@ -131,7 +131,6 @@ static void enable_dev(struct device *dev)
 static void soc_init(void *chip_info)
 {
 	fch_init(chip_info);
-	setup_bsp_ramtop();
 }
 
 static void soc_final(void *chip_info)
diff --git a/src/soc/amd/stoneyridge/northbridge.c b/src/soc/amd/stoneyridge/northbridge.c
index d5231ad5d5..5d5ed7a38a 100644
--- a/src/soc/amd/stoneyridge/northbridge.c
+++ b/src/soc/amd/stoneyridge/northbridge.c
@@ -332,7 +332,7 @@ static const struct pci_driver family15_northbridge __pci_driver = {
  */
 void amd_initcpuio(void)
 {
-	uintptr_t topmem = bsp_topmem();
+	uintptr_t topmem = amd_topmem();
 	uintptr_t base, limit;
 
 	/* Enable legacy video routing: D18F1xF4 VGA Enable */