MIPS: OCTEON: Save/Restore wider multiply registers in OCTEON III CPUs
The wide multiplier is twice as wide, so we need to save twice as much
state. Detect the multiplier type (CPU type) at start up and install
model specific handlers.
[aleksey.makarov@auriga.com:
conflict resolution,
support for old compilers]
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Leonid Rosenboim <lrosenboim@caviumnetworks.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@auriga.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/8933/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/cavium-octeon/setup.c b/arch/mips/cavium-octeon/setup.c
index 94f888d..2d8a531 100644
--- a/arch/mips/cavium-octeon/setup.c
+++ b/arch/mips/cavium-octeon/setup.c
@@ -615,6 +615,7 @@
const char *arg;
char *p;
int i;
+ u64 t;
int argc;
#ifdef CONFIG_CAVIUM_RESERVE32
int64_t addr = -1;
@@ -663,6 +664,42 @@
octeon_io_clock_rate = sysinfo->cpu_clock_hz;
}
+ t = read_c0_cvmctl();
+ if ((t & (1ull << 27)) == 0) {
+ /*
+ * Setup the multiplier save/restore code if
+ * CvmCtl[NOMUL] clear.
+ */
+ void *save;
+ void *save_end;
+ void *restore;
+ void *restore_end;
+ int save_len;
+ int restore_len;
+ int save_max = (char *)octeon_mult_save_end -
+ (char *)octeon_mult_save;
+ int restore_max = (char *)octeon_mult_restore_end -
+ (char *)octeon_mult_restore;
+ if (current_cpu_data.cputype == CPU_CAVIUM_OCTEON3) {
+ save = octeon_mult_save3;
+ save_end = octeon_mult_save3_end;
+ restore = octeon_mult_restore3;
+ restore_end = octeon_mult_restore3_end;
+ } else {
+ save = octeon_mult_save2;
+ save_end = octeon_mult_save2_end;
+ restore = octeon_mult_restore2;
+ restore_end = octeon_mult_restore2_end;
+ }
+ save_len = (char *)save_end - (char *)save;
+ restore_len = (char *)restore_end - (char *)restore;
+ if (!WARN_ON(save_len > save_max ||
+ restore_len > restore_max)) {
+ memcpy(octeon_mult_save, save, save_len);
+ memcpy(octeon_mult_restore, restore, restore_len);
+ }
+ }
+
/*
* Only enable the LED controller if we're running on a CN38XX, CN58XX,
* or CN56XX. The CN30XX and CN31XX don't have an LED controller.
diff --git a/arch/mips/include/asm/octeon/octeon.h b/arch/mips/include/asm/octeon/octeon.h
index d781f9e..3e505a2 100644
--- a/arch/mips/include/asm/octeon/octeon.h
+++ b/arch/mips/include/asm/octeon/octeon.h
@@ -229,6 +229,19 @@
cvmx_read64_uint32(address ^ 4);
}
+/* Octeon multiplier save/restore routines from octeon_switch.S */
+void octeon_mult_save(void);
+void octeon_mult_restore(void);
+void octeon_mult_save_end(void);
+void octeon_mult_restore_end(void);
+void octeon_mult_save3(void);
+void octeon_mult_save3_end(void);
+void octeon_mult_save2(void);
+void octeon_mult_save2_end(void);
+void octeon_mult_restore3(void);
+void octeon_mult_restore3_end(void);
+void octeon_mult_restore2(void);
+void octeon_mult_restore2_end(void);
/**
* Read a 32bit value from the Octeon NPI register space
diff --git a/arch/mips/include/asm/ptrace.h b/arch/mips/include/asm/ptrace.h
index fc783f8..ffc3203 100644
--- a/arch/mips/include/asm/ptrace.h
+++ b/arch/mips/include/asm/ptrace.h
@@ -40,8 +40,8 @@
unsigned long cp0_cause;
unsigned long cp0_epc;
#ifdef CONFIG_CPU_CAVIUM_OCTEON
- unsigned long long mpl[3]; /* MTM{0,1,2} */
- unsigned long long mtp[3]; /* MTP{0,1,2} */
+ unsigned long long mpl[6]; /* MTM{0-5} */
+ unsigned long long mtp[6]; /* MTP{0-5} */
#endif
} __aligned(8);
diff --git a/arch/mips/kernel/octeon_switch.S b/arch/mips/kernel/octeon_switch.S
index f654768..3dec1e8 100644
--- a/arch/mips/kernel/octeon_switch.S
+++ b/arch/mips/kernel/octeon_switch.S
@@ -450,18 +450,23 @@
* void octeon_mult_save()
* sp is assumed to point to a struct pt_regs
*
- * NOTE: This is called in SAVE_SOME in stackframe.h. It can only
- * safely modify k0 and k1.
+ * NOTE: This is called in SAVE_TEMP in stackframe.h. It can
+ * safely modify v1,k0, k1,$10-$15, and $24. It will
+ * be overwritten with a processor specific version of the code.
*/
- .align 7
+ .p2align 7
.set push
.set noreorder
LEAF(octeon_mult_save)
- dmfc0 k0, $9,7 /* CvmCtl register. */
- bbit1 k0, 27, 1f /* Skip CvmCtl[NOMUL] */
+ jr ra
nop
+ .space 30 * 4, 0
+octeon_mult_save_end:
+ EXPORT(octeon_mult_save_end)
+ END(octeon_mult_save)
- /* Save the multiplier state */
+ LEAF(octeon_mult_save2)
+ /* Save the multiplier state OCTEON II and earlier*/
v3mulu k0, $0, $0
v3mulu k1, $0, $0
sd k0, PT_MTP(sp) /* PT_MTP has P0 */
@@ -476,44 +481,107 @@
sd k0, PT_MPL+8(sp) /* PT_MPL+8 has MPL1 */
jr ra
sd k1, PT_MPL+16(sp) /* PT_MPL+16 has MPL2 */
+octeon_mult_save2_end:
+ EXPORT(octeon_mult_save2_end)
+ END(octeon_mult_save2)
-1: /* Resume here if CvmCtl[NOMUL] */
+ LEAF(octeon_mult_save3)
+ /* Save the multiplier state OCTEON III */
+ v3mulu $10, $0, $0 /* read P0 */
+ v3mulu $11, $0, $0 /* read P1 */
+ v3mulu $12, $0, $0 /* read P2 */
+ sd $10, PT_MTP+(0*8)(sp) /* store P0 */
+ v3mulu $10, $0, $0 /* read P3 */
+ sd $11, PT_MTP+(1*8)(sp) /* store P1 */
+ v3mulu $11, $0, $0 /* read P4 */
+ sd $12, PT_MTP+(2*8)(sp) /* store P2 */
+ ori $13, $0, 1
+ v3mulu $12, $0, $0 /* read P5 */
+ sd $10, PT_MTP+(3*8)(sp) /* store P3 */
+ v3mulu $13, $13, $0 /* P4-P0 = MPL5-MPL1, $13 = MPL0 */
+ sd $11, PT_MTP+(4*8)(sp) /* store P4 */
+ v3mulu $10, $0, $0 /* read MPL1 */
+ sd $12, PT_MTP+(5*8)(sp) /* store P5 */
+ v3mulu $11, $0, $0 /* read MPL2 */
+ sd $13, PT_MPL+(0*8)(sp) /* store MPL0 */
+ v3mulu $12, $0, $0 /* read MPL3 */
+ sd $10, PT_MPL+(1*8)(sp) /* store MPL1 */
+ v3mulu $10, $0, $0 /* read MPL4 */
+ sd $11, PT_MPL+(2*8)(sp) /* store MPL2 */
+ v3mulu $11, $0, $0 /* read MPL5 */
+ sd $12, PT_MPL+(3*8)(sp) /* store MPL3 */
+ sd $10, PT_MPL+(4*8)(sp) /* store MPL4 */
jr ra
- END(octeon_mult_save)
+ sd $11, PT_MPL+(5*8)(sp) /* store MPL5 */
+octeon_mult_save3_end:
+ EXPORT(octeon_mult_save3_end)
+ END(octeon_mult_save3)
.set pop
/*
* void octeon_mult_restore()
* sp is assumed to point to a struct pt_regs
*
- * NOTE: This is called in RESTORE_SOME in stackframe.h.
+ * NOTE: This is called in RESTORE_TEMP in stackframe.h.
*/
- .align 7
+ .p2align 7
.set push
.set noreorder
LEAF(octeon_mult_restore)
- dmfc0 k1, $9,7 /* CvmCtl register. */
- ld v0, PT_MPL(sp) /* MPL0 */
- ld v1, PT_MPL+8(sp) /* MPL1 */
- ld k0, PT_MPL+16(sp) /* MPL2 */
- bbit1 k1, 27, 1f /* Skip CvmCtl[NOMUL] */
- /* Normally falls through, so no time wasted here */
- nop
-
- /* Restore the multiplier state */
- ld k1, PT_MTP+16(sp) /* P2 */
- MTM0 v0 /* MPL0 */
- ld v0, PT_MTP+8(sp) /* P1 */
- MTM1 v1 /* MPL1 */
- ld v1, PT_MTP(sp) /* P0 */
- MTM2 k0 /* MPL2 */
- MTP2 k1 /* P2 */
- MTP1 v0 /* P1 */
- jr ra
- MTP0 v1 /* P0 */
-
-1: /* Resume here if CvmCtl[NOMUL] */
jr ra
nop
+ .space 30 * 4, 0
+octeon_mult_restore_end:
+ EXPORT(octeon_mult_restore_end)
END(octeon_mult_restore)
+
+ LEAF(octeon_mult_restore2)
+ ld v0, PT_MPL(sp) /* MPL0 */
+ ld v1, PT_MPL+8(sp) /* MPL1 */
+ ld k0, PT_MPL+16(sp) /* MPL2 */
+ /* Restore the multiplier state */
+ ld k1, PT_MTP+16(sp) /* P2 */
+ mtm0 v0 /* MPL0 */
+ ld v0, PT_MTP+8(sp) /* P1 */
+ mtm1 v1 /* MPL1 */
+ ld v1, PT_MTP(sp) /* P0 */
+ mtm2 k0 /* MPL2 */
+ mtp2 k1 /* P2 */
+ mtp1 v0 /* P1 */
+ jr ra
+ mtp0 v1 /* P0 */
+octeon_mult_restore2_end:
+ EXPORT(octeon_mult_restore2_end)
+ END(octeon_mult_restore2)
+
+ LEAF(octeon_mult_restore3)
+ ld $12, PT_MPL+(0*8)(sp) /* read MPL0 */
+ ld $13, PT_MPL+(3*8)(sp) /* read MPL3 */
+ ld $10, PT_MPL+(1*8)(sp) /* read MPL1 */
+ ld $11, PT_MPL+(4*8)(sp) /* read MPL4 */
+ .word 0x718d0008
+ /* mtm0 $12, $13 restore MPL0 and MPL3 */
+ ld $12, PT_MPL+(2*8)(sp) /* read MPL2 */
+ .word 0x714b000c
+ /* mtm1 $10, $11 restore MPL1 and MPL4 */
+ ld $13, PT_MPL+(5*8)(sp) /* read MPL5 */
+ ld $10, PT_MTP+(0*8)(sp) /* read P0 */
+ ld $11, PT_MTP+(3*8)(sp) /* read P3 */
+ .word 0x718d000d
+ /* mtm2 $12, $13 restore MPL2 and MPL5 */
+ ld $12, PT_MTP+(1*8)(sp) /* read P1 */
+ .word 0x714b0009
+ /* mtp0 $10, $11 restore P0 and P3 */
+ ld $13, PT_MTP+(4*8)(sp) /* read P4 */
+ ld $10, PT_MTP+(2*8)(sp) /* read P2 */
+ ld $11, PT_MTP+(5*8)(sp) /* read P5 */
+ .word 0x718d000a
+ /* mtp1 $12, $13 restore P1 and P4 */
+ jr ra
+ .word 0x714b000b
+ /* mtp2 $10, $11 restore P2 and P5 */
+
+octeon_mult_restore3_end:
+ EXPORT(octeon_mult_restore3_end)
+ END(octeon_mult_restore3)
.set pop