[PATCH 4/7] lib: utils/sys: Add CLINT memregion in the root domain

[Xiang W]

在 2021-04-10六的 12:48 +0530，Anup Patel写道：
> The CLINT memory should not be accessed by the supervisor-mode
> software so let's protect it by adding CLINT memregion to the
> root domain.
> 
> Signed-off-by: Anup Patel <anup.patel at wdc.com>
clint_cold_timer_init and clint_cold_ipi_init may use the same clint,
which will call clint_add_root_memregion twice and generate an error.
I suggest to separate

In clint_cold_timer_init execute
sbi_domain_memregion_init(clint->addr, 0x4000,
SBI_DOMAIN_MEMREGION_MMIO, &reg);

In clint_cold_ipi_init execute
sbi_domain_memregion_init(clint->addr + 0x4000, 0x8000,
SBI_DOMAIN_MEMREGION_MMIO, &reg);

Regards,
Xiang W
> ---
>  lib/utils/sys/clint.c | 17 +++++++++++++++--
>  1 file changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/utils/sys/clint.c b/lib/utils/sys/clint.c
> index 7a392aa..fe98cc4 100644
> --- a/lib/utils/sys/clint.c
> +++ b/lib/utils/sys/clint.c
> @@ -10,6 +10,7 @@
>  #include <sbi/riscv_asm.h>
>  #include <sbi/riscv_atomic.h>
>  #include <sbi/riscv_io.h>
> +#include <sbi/sbi_domain.h>
>  #include <sbi/sbi_error.h>
>  #include <sbi/sbi_hartmask.h>
>  #include <sbi_utils/sys/clint.h>
> @@ -17,9 +18,19 @@
>  #define CLINT_IPI_OFF		0
>  #define CLINT_TIME_CMP_OFF	0x4000
>  #define CLINT_TIME_VAL_OFF	0xbff8
> +#define CLINT_SIZE		0xc000
>  
>  static struct clint_data
> *clint_ipi_hartid2data[SBI_HARTMASK_MAX_BITS];
>  
> +static int clint_add_root_memregion(struct clint_data *clint)
> +{
> +	struct sbi_domain_memregion reg;
> +
> +	sbi_domain_memregion_init(clint->addr, CLINT_SIZE,
> +				  SBI_DOMAIN_MEMREGION_MMIO, &reg);
> +	return sbi_domain_root_add_memregion(&reg, true);
> +}
> +
>  void clint_ipi_send(u32 target_hart)
>  {
>  	struct clint_data *clint;
> @@ -70,7 +81,8 @@ int clint_cold_ipi_init(struct clint_data *clint)
>  	for (i = 0; i < clint->hart_count; i++)
>  		clint_ipi_hartid2data[clint->first_hartid + i] = clint;
>  
> -	return 0;
> +	/* Add CLINT region to the root domain */
> +	return clint_add_root_memregion(clint);
>  }
>  
>  static struct clint_data
> *clint_timer_hartid2data[SBI_HARTMASK_MAX_BITS];
> @@ -199,5 +211,6 @@ int clint_cold_timer_init(struct clint_data
> *clint,
>  	for (i = 0; i < clint->hart_count; i++)
>  		clint_timer_hartid2data[clint->first_hartid + i] =
> clint;
>  
> -	return 0;
> +	/* Add CLINT region to the root domain */
> +	return clint_add_root_memregion(clint);
>  }
> -- 
> 2.25.1
> 
>