Commit 0fd7375a authored by Mao Minkai's avatar Mao Minkai Committed by guzitao
Browse files

sw64: add syscall pfh_ops 

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IBDJNZ



--------------------------------

Add a new syscall pfh_ops which allows system administrators to
modify hardware cache prefetch configuration.

Signed-off-by: default avatarMao Minkai <maominkai@wxiat.com>
Reviewed-by: default avatarHe Sheng <hesheng@wxiat.com>
Signed-off-by: default avatarGu Zitao <guzitao@wxiat.com>
parent d0ced270

arch/sw_64/include/asm/csr.h

+2 −0
Original line number Diff line number Diff line
@@ -20,8 +20,10 @@ 
#define CSR_EXC_PC		0xe

#define CSR_AS_INFO		0x3c

#define CSR_DS_STAT		0x48

#define CSR_PFH_CTL		0x4f

#define CSR_SOFTCID		0xc9

#define CSR_DVA			0x54

#define CSR_PFH_CNT		0x5c

#define CSR_BRRETC		0x5e

#define CSR_BRFAILC		0x5f

#define CSR_PTBR_SYS		0x68

arch/sw_64/kernel/sys_sw64.c

+61 −0
Original line number Diff line number Diff line
@@ -151,3 +151,64 @@ SYSCALL_DEFINE0(sw64_pipe) 
	}

	return res;

}



#ifdef CONFIG_SUBARCH_C4



struct pfh_val {

	unsigned long pfh_ctl;

	unsigned long pfh_cnt;

};



static void local_set_pfh(void *info)

{

	struct pfh_val *kbuf = info;



	if (kbuf->pfh_ctl)

		sw64_write_csr(kbuf->pfh_ctl, CSR_PFH_CTL);

	if (kbuf->pfh_cnt)

		sw64_write_csr(kbuf->pfh_cnt, CSR_PFH_CNT);

}



SYSCALL_DEFINE3(pfh_ops, unsigned long, op,

		unsigned long __user *, pfh_ctl_p,

		unsigned long __user *, pfh_cnt_p)

{

	struct pfh_val kbuf = {0, 0};

	long error = 0;



	if (!capable(CAP_SYS_ADMIN))

		return -EPERM;



	if (op) {	// op != 0, set

		if (pfh_ctl_p)

			error |= get_user(kbuf.pfh_ctl, pfh_ctl_p);

		if (pfh_cnt_p)

			error |= get_user(kbuf.pfh_cnt, pfh_cnt_p);



		if (!error && (kbuf.pfh_ctl || kbuf.pfh_cnt)) {

			smp_call_function(local_set_pfh, &kbuf, 1);

			local_set_pfh(&kbuf);

		}

	} else {	// op == 0, get

		if (pfh_ctl_p) {

			kbuf.pfh_ctl = sw64_read_csr(CSR_PFH_CTL);

			error |= put_user(kbuf.pfh_ctl, pfh_ctl_p);

		}



		if (pfh_cnt_p) {

			kbuf.pfh_cnt = sw64_read_csr(CSR_PFH_CNT);

			error |= put_user(kbuf.pfh_cnt, pfh_cnt_p);

		}

	}



	return error;

}



#else



SYSCALL_DEFINE0(pfh_ops)

{

	return -ENOSYS;

}



#endif /* CONFIG_SUBARCH_C4 */

arch/sw_64/kernel/syscalls/syscall.tbl

+1 −1
Original line number Diff line number Diff line
@@ -117,7 +117,7 @@ 
#107 is unused

#108 is unused

#109 is unused

#110 is unused

110	common	pfh_ops				sys_pfh_ops

111	common	sigsuspend			sys_sigsuspend

#112 is unused

113	common	recvmsg				sys_recvmsg