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authorMika Westerberg <mika.westerberg@iki.fi>2010-10-28 06:27:40 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-10-28 08:54:28 -0400
commitc8c90860cd3592fac83a349f84a20360a6498727 (patch)
tree3a97e1cb8451a9cdfff9f5ab574bf16581a9c7ef /arch/arm/mm/proc-arm940.S
parent4e54d93d3c9846ba1c2644ad06463dafa690d1b7 (diff)
ARM: 6466/1: implement flush_icache_all for the rest of the CPUs
Commit 81d11955bf0 ("ARM: 6405/1: Handle __flush_icache_all for CONFIG_SMP_ON_UP") added a new function to struct cpu_cache_fns: flush_icache_all(). It also implemented this for v6 and v7 but not for v5 and backwards. Without the function pointer in place, we will be calling wrong cache functions. For example with ep93xx we get following: Unable to handle kernel paging request at virtual address ee070f38 pgd = c0004000 [ee070f38] *pgd=00000000 Internal error: Oops: 80000005 [#1] PREEMPT last sysfs file: Modules linked in: CPU: 0 Not tainted (2.6.36+ #1) PC is at 0xee070f38 LR is at __dma_alloc+0x11c/0x2d0 pc : [<ee070f38>] lr : [<c0032c8c>] psr: 60000013 sp : c581bde0 ip : 00000000 fp : c0472000 r10: c0472000 r9 : 000000d0 r8 : 00020000 r7 : 0001ffff r6 : 00000000 r5 : c0472400 r4 : c5980000 r3 : c03ab7e0 r2 : 00000000 r1 : c59a0000 r0 : c5980000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel Control: c000717f Table: c0004000 DAC: 00000017 Process swapper (pid: 1, stack limit = 0xc581a270) [<c0032c8c>] (__dma_alloc+0x11c/0x2d0) [<c0032e5c>] (dma_alloc_writecombine+0x1c/0x24) [<c0204148>] (ep93xx_pcm_preallocate_dma_buffer+0x44/0x60) [<c02041c0>] (ep93xx_pcm_new+0x5c/0x88) [<c01ff188>] (snd_soc_instantiate_cards+0x8a8/0xbc0) [<c01ff59c>] (soc_probe+0xfc/0x134) [<c01adafc>] (platform_drv_probe+0x18/0x1c) [<c01acca4>] (driver_probe_device+0xb0/0x16c) [<c01ac284>] (bus_for_each_drv+0x48/0x84) [<c01ace90>] (device_attach+0x50/0x68) [<c01ac0f8>] (bus_probe_device+0x24/0x44) [<c01aad7c>] (device_add+0x2fc/0x44c) [<c01adfa8>] (platform_device_add+0x104/0x15c) [<c0015eb8>] (simone_init+0x60/0x94) [<c0021410>] (do_one_initcall+0xd0/0x1a4) __dma_alloc() calls (inlined) __dma_alloc_buffer() which ends up calling dmac_flush_range(). Now since the entries in the arm920_cache_fns are shifted by one, we jump into address 0xee070f38 which is actually next instruction after the arm920_cache_fns structure. So implement flush_icache_all() for the rest of the supported CPUs using a generic 'invalidate I cache' instruction. Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/proc-arm940.S')
-rw-r--r--arch/arm/mm/proc-arm940.S12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/arm/mm/proc-arm940.S b/arch/arm/mm/proc-arm940.S
index f6a62822418e..7b11cdb9935f 100644
--- a/arch/arm/mm/proc-arm940.S
+++ b/arch/arm/mm/proc-arm940.S
@@ -68,6 +68,17 @@ ENTRY(cpu_arm940_do_idle)
68 mov pc, lr 68 mov pc, lr
69 69
70/* 70/*
71 * flush_icache_all()
72 *
73 * Unconditionally clean and invalidate the entire icache.
74 */
75ENTRY(arm940_flush_icache_all)
76 mov r0, #0
77 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
78 mov pc, lr
79ENDPROC(arm940_flush_icache_all)
80
81/*
71 * flush_user_cache_all() 82 * flush_user_cache_all()
72 */ 83 */
73ENTRY(arm940_flush_user_cache_all) 84ENTRY(arm940_flush_user_cache_all)
@@ -254,6 +265,7 @@ ENTRY(arm940_dma_unmap_area)
254ENDPROC(arm940_dma_unmap_area) 265ENDPROC(arm940_dma_unmap_area)
255 266
256ENTRY(arm940_cache_fns) 267ENTRY(arm940_cache_fns)
268 .long arm940_flush_icache_all
257 .long arm940_flush_kern_cache_all 269 .long arm940_flush_kern_cache_all
258 .long arm940_flush_user_cache_all 270 .long arm940_flush_user_cache_all
259 .long arm940_flush_user_cache_range 271 .long arm940_flush_user_cache_range