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powerpc: export MIN RMA size

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Commit 683eab94da ("powerpc/fadump: setup additional parameters for
dump capture kernel") introduced the additional parameter feature in
fadump for HASH MMU with the understanding that GRUB does not use the
memory area between 640MB and 768MB for its operation.

However, the third patch ("powerpc: increase MIN RMA size for CAS
negotiation") in this series is changing the MIN RMA size to 768MB,
allowing GRUB to use memory up to 768MB. This makes the fadump
reservation for the additional parameter feature for HASH MMU
unreliable.

To address this, export the MIN_RMA so that the next patch
("powerpc/fadump: fix additional param memory reservation for HASH MMU")
can identify the correct memory range for the additional parameter
feature in fadump for HASH MMU.

Reviewed-by: Mahesh Salgaonkar <mahesh@linux.ibm.com>
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250123114254.200527-2-sourabhjain@linux.ibm.com
This commit is contained in:
Sourabh Jain 2025-01-23 17:12:51 +05:30 committed by Madhavan Srinivasan
parent a64dcfb451
commit 0bdd7ff5b8
2 changed files with 3 additions and 1 deletions
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2
arch/powerpc/include/asm/prom.h
View File

@ -17,6 +17,8 @@
struct device_node;
struct property;
#define MIN_RMA 512 /* Minimum RMA (in MB) for CAS negotiation */
#define OF_DT_BEGIN_NODE 0x1 /* Start of node, full name */
#define OF_DT_END_NODE 0x2 /* End node */
#define OF_DT_PROP 0x3 /* Property: name off, size,

2
arch/powerpc/kernel/prom_init.c
View File

@ -1061,7 +1061,7 @@ static const struct ibm_arch_vec ibm_architecture_vec_template __initconst = {
.virt_base = cpu_to_be32(0xffffffff),
.virt_size = cpu_to_be32(0xffffffff),
.load_base = cpu_to_be32(0xffffffff),
.min_rma = cpu_to_be32(512), /* 512MB min RMA */
.min_rma = cpu_to_be32(MIN_RMA),
.min_load = cpu_to_be32(0xffffffff), /* full client load */
.min_rma_percent = 0, /* min RMA percentage of total RAM */
.max_pft_size = 48, /* max log_2(hash table size) */