2023-10-27 22:12:16

by Jiaxun Yang

Subject: [PATCH v2 07/10] MIPS: traps: Handle CPU with non standard vint offset

Some BMIPS cpus has none standard start offset for vector interrupts.

Handle those CPUs in vector size calculation and handler setup process.

Signed-off-by: Jiaxun Yang <[email protected]>
---
arch/mips/kernel/traps.c | 32 +++++++++++++++++++++++---------
1 file changed, 23 insertions(+), 9 deletions(-)

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index ea59d321f713..651c9ec6265a 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -74,7 +74,6 @@

#include "access-helper.h"

-#define MAX(a, b) ((a) >= (b) ? (a) : (b))

extern void check_wait(void);
extern asmlinkage void rollback_handle_int(void);
@@ -2005,6 +2004,7 @@ void __noreturn nmi_exception_handler(struct pt_regs *regs)
unsigned long ebase;
EXPORT_SYMBOL_GPL(ebase);
unsigned long exception_handlers[32];
+static unsigned long vi_vecbase;
unsigned long vi_handlers[64];

void reserve_exception_space(phys_addr_t addr, unsigned long size)
@@ -2074,7 +2074,7 @@ static void *set_vi_srs_handler(int n, vi_handler_t addr, int srs)
handler = (unsigned long) addr;
vi_handlers[n] = handler;

- b = (unsigned char *)(ebase + 0x200 + n*VECTORSPACING);
+ b = (unsigned char *)(vi_vecbase + n*VECTORSPACING);

if (srs >= srssets)
panic("Shadow register set %d not supported", srs);
@@ -2370,20 +2370,33 @@ void __init trap_init(void)
extern char except_vec3_generic;
extern char except_vec4;
extern char except_vec3_r4000;
- unsigned long i, vec_size;
+ unsigned long i, vec_size, vi_vec_offset;
phys_addr_t ebase_pa;

check_wait();

+ if (cpu_has_veic || cpu_has_vint) {
+ switch (current_cpu_type()) {
+ case CPU_BMIPS3300:
+ case CPU_BMIPS4380:
+ vi_vec_offset = 0x400;
+ break;
+ case CPU_BMIPS5000:
+ vi_vec_offset = 0x1000;
+ break;
+ default:
+ vi_vec_offset = 0x200;
+ break;
+ }
+ vec_size = vi_vec_offset + VECTORSPACING*64;
+ } else {
+ vec_size = 0x400;
+ }
+
if (!cpu_has_mips_r2_r6) {
ebase = CAC_BASE;
- vec_size = 0x400;
} else {
- if (cpu_has_veic || cpu_has_vint)
- vec_size = 0x200 + VECTORSPACING*64;
- else
- vec_size = PAGE_SIZE;
-
+ vec_size = max(vec_size, PAGE_SIZE);
ebase_pa = memblock_phys_alloc(vec_size, 1 << fls(vec_size));
if (!ebase_pa)
panic("%s: Failed to allocate %lu bytes align=0x%x\n",
@@ -2450,6 +2463,7 @@ void __init trap_init(void)
* Initialise interrupt handlers
*/
if (cpu_has_veic || cpu_has_vint) {
+ vi_vecbase = ebase + vi_vec_offset;
int nvec = cpu_has_veic ? 64 : 8;
for (i = 0; i < nvec; i++)
set_vi_handler(i, NULL);
--
2.34.1

2023-12-22 12:20:29

by Thomas Bogendoerfer

Subject: Re: [PATCH v2 07/10] MIPS: traps: Handle CPU with non standard vint offset

On Fri, Oct 27, 2023 at 11:11:03PM +0100, Jiaxun Yang wrote:
> Some BMIPS cpus has none standard start offset for vector interrupts.
>
> Handle those CPUs in vector size calculation and handler setup process.

hmm, I see no connection to what this series is fixing. How does it
work without this patch ?

Thomas.

--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]

2023-12-22 12:47:18

by Jiaxun Yang

Subject: Re: [PATCH v2 07/10] MIPS: traps: Handle CPU with non standard vint offset

在 2023/12/22 12:19, Thomas Bogendoerfer 写道:
> On Fri, Oct 27, 2023 at 11:11:03PM +0100, Jiaxun Yang wrote:
>> Some BMIPS cpus has none standard start offset for vector interrupts.
>>
>> Handle those CPUs in vector size calculation and handler setup process.
> hmm, I see no connection to what this series is fixing. How does it
> work without this patch ?

In this series reservation of exception vector is moved to here, so it's
critical
to have correct size.

Thanks
- Jiaxun

>
> Thomas.
>