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lib: utils/irqchip: Add shared MMIO region for PLIC in root domain

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On platforms with Smepmp, the MMIO regions accessed by M-mode need
to be explicitly marked with M-mode only read/write or shared (both
(M-mode and S-mode) read/write permission.

If the above is not done then runtime PLIC access from M-mode on
platforms with Smepmp will result in access fault when further
results in CPU hotplug not working.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
This commit is contained in:
Anup Patel
2023-12-11 14:07:56 +05:30
committed by Anup Patel
parent 80169b25f8
commit cdebae2cc9
9 changed files with 21 additions and 1 deletions
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1
lib/utils/fdt/fdt_helper.c
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@@ -880,6 +880,7 @@ int fdt_parse_plic_node(void *fdt, int nodeoffset, struct plic_data *plic)
if (rc < 0 || !reg_addr || !reg_size)
return SBI_ENODEV;
plic->addr = reg_addr;
plic->size = reg_size;
val = fdt_getprop(fdt, nodeoffset, "riscv,ndev", &len);
if (len > 0)

6
lib/utils/irqchip/plic.c
View File

@@ -10,7 +10,9 @@
#include <sbi/riscv_io.h>
#include <sbi/riscv_encoding.h>
#include <sbi/sbi_bitops.h>
#include <sbi/sbi_console.h>
#include <sbi/sbi_domain.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_string.h>
#include <sbi_utils/irqchip/plic.h>
@@ -171,5 +173,7 @@ int plic_cold_irqchip_init(const struct plic_data *plic)
for (i = 1; i <= plic->num_src; i++)
plic_set_priority(plic, i, 0);
return 0;
return sbi_domain_root_add_memrange(plic->addr, plic->size, BIT(20),
(SBI_DOMAIN_MEMREGION_MMIO |
SBI_DOMAIN_MEMREGION_SHARED_SURW_MRW));
}