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powerpc/pseries/fadump: add support for multiple boot memory regions

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Currently, fadump on pseries assumes a single boot memory region even
though f/w supports more than one boot memory region. Add support for
more boot memory regions to make the implementation flexible for any
enhancements that introduce other region types. For this, rtas memory
structure for fadump is updated to have multiple boot memory regions
instead of just one. Additionally, methods responsible for creating
the fadump memory structure during both the first and second kernel
boot have been modified to take these multiple boot memory regions
into account. Also, a new callback has been added to the fadump_ops
structure to get the maximum boot memory regions supported by the
platform.

Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240509115755.519982-2-hbathini@linux.ibm.com
This commit is contained in:
Hari Bathini
2024-05-09 17:27:53 +05:30
committed by Michael Ellerman
parent 98ec6d38ee
commit 78d5cc15fb
5 changed files with 195 additions and 118 deletions
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arch/powerpc/kernel/fadump.c
+3 -24
View File
@@ -220,28 +220,6 @@ static bool is_fadump_mem_area_contiguous(u64 d_start, u64 d_end)
return ret;
}
/*
* Returns true, if there are no holes in boot memory area,
* false otherwise.
*/
bool is_fadump_boot_mem_contiguous(void)
{
unsigned long d_start, d_end;
bool ret = false;
int i;
for (i = 0; i < fw_dump.boot_mem_regs_cnt; i++) {
d_start = fw_dump.boot_mem_addr[i];
d_end = d_start + fw_dump.boot_mem_sz[i];
ret = is_fadump_mem_area_contiguous(d_start, d_end);
if (!ret)
break;
}
return ret;
}
/*
* Returns true, if there are no holes in reserved memory area,
* false otherwise.
@@ -381,10 +359,11 @@ static unsigned long __init get_fadump_area_size(void)
static int __init add_boot_mem_region(unsigned long rstart,
unsigned long rsize)
{
int max_boot_mem_rgns = fw_dump.ops->fadump_max_boot_mem_rgns();
int i = fw_dump.boot_mem_regs_cnt++;
if (fw_dump.boot_mem_regs_cnt > FADUMP_MAX_MEM_REGS) {
fw_dump.boot_mem_regs_cnt = FADUMP_MAX_MEM_REGS;
if (fw_dump.boot_mem_regs_cnt > max_boot_mem_rgns) {
fw_dump.boot_mem_regs_cnt = max_boot_mem_rgns;
return 0;
}