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ARM: OMAP2+: Fix regression for smc calls for vmap stack

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Commit 9c46929e79 ("ARM: implement THREAD_INFO_IN_TASK for uniprocessor
systems") started triggering an issue with smc calls hanging on boot as
VMAP_STACK is now enabled by default.

Based on discussions on the #armlinux irc channel, Arnd noticed that omaps
are using __pa() for stack for smc calls. This does not work with vmap
stack.

Let's fix the issue by changing the param arrays to use static param[5] for
each function for __pa() to work. This consumes a bit more memory compared
to adding a single static buffer, but avoids potential races with the smc
calls initializing the shared buffer. For omap_secure_dispatcher(), we need
to use a cpu specific buffer as there's nothing currently ensuring it only
gets called from cpu0.

Fixes: 9c46929e79 ("ARM: implement THREAD_INFO_IN_TASK for uniprocessor systems")
Link: https://lore.kernel.org/r/20220331171737.48211-1-tony@atomide.com
Suggested-by: Ard Biesheuvel <ardb@kernel.org>
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Tony Lindgren 2022-03-31 20:17:37 +03:00 committed by Arnd Bergmann
parent 6a2f0b2d3b
commit 8cf8df8967
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GPG key ID: 9A6C79EFE60018D9
1 changed files with 10 additions and 3 deletions
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13
arch/arm/mach-omap2/omap-secure.c
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@ -59,8 +59,13 @@ static void __init omap_optee_init_check(void)
u32 omap_secure_dispatcher(u32 idx, u32 flag, u32 nargs, u32 arg1, u32 arg2,
u32 arg3, u32 arg4)
{
static u32 buf[NR_CPUS][5];
u32 *param;
int cpu;
u32 ret;
u32 param[5];
cpu = get_cpu();
param = buf[cpu];
param[0] = nargs;
param[1] = arg1;
@ -76,6 +81,8 @@ u32 omap_secure_dispatcher(u32 idx, u32 flag, u32 nargs, u32 arg1, u32 arg2,
outer_clean_range(__pa(param), __pa(param + 5));
ret = omap_smc2(idx, flag, __pa(param));
put_cpu();
return ret;
}
@ -119,8 +126,8 @@ phys_addr_t omap_secure_ram_mempool_base(void)
#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_PM)
u32 omap3_save_secure_ram(void __iomem *addr, int size)
{
static u32 param[5];
u32 ret;
u32 param[5];
if (size != OMAP3_SAVE_SECURE_RAM_SZ)
return OMAP3_SAVE_SECURE_RAM_SZ;
@ -153,8 +160,8 @@ u32 omap3_save_secure_ram(void __iomem *addr, int size)
u32 rx51_secure_dispatcher(u32 idx, u32 process, u32 flag, u32 nargs,
u32 arg1, u32 arg2, u32 arg3, u32 arg4)
{
static u32 param[5];
u32 ret;
u32 param[5];
param[0] = nargs+1; /* RX-51 needs number of arguments + 1 */
param[1] = arg1;