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Commit 705d1e73 authored by Eugeniy Paltsev's avatar Eugeniy Paltsev Committed by Greg Kroah-Hartman
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ARC: IOC: panic if kernel was started with previously enabled IOC 

[ Upstream commit 3624379d90ad2b65f9dbb30d7f7ce5498d2fe322 ]

If IOC was already enabled (due to bootloader) it technically needs to
be reconfigured with aperture base,size corresponding to Linux memory map
which will certainly be different than uboot's. But disabling and
reenabling IOC when DMA might be potentially active is tricky business.
To avoid random memory issues later, just panic here and ask user to
upgrade bootloader to one which doesn't enable IOC

This was actually seen as issue on some of the HSDK board with a version
of uboot which enabled IOC. There were random issues later with starting
of X or peripherals etc.

Also while I'm at it, replace hardcoded bits in ARC_REG_IO_COH_PARTIAL
and ARC_REG_IO_COH_ENABLE registers by definitions.

Inspired by: https://lkml.org/lkml/2018/1/19/557


Signed-off-by: default avatarEugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 2d484087

arch/arc/include/asm/cache.h

+2 −0
Original line number Diff line number Diff line
@@ -124,7 +124,9 @@ extern unsigned long perip_base, perip_end; 


/* IO coherency related Auxiliary registers */

#define ARC_REG_IO_COH_ENABLE	0x500

#define ARC_IO_COH_ENABLE_BIT	BIT(0)

#define ARC_REG_IO_COH_PARTIAL	0x501

#define ARC_IO_COH_PARTIAL_BIT	BIT(0)

#define ARC_REG_IO_COH_AP0_BASE	0x508

#define ARC_REG_IO_COH_AP0_SIZE	0x509

arch/arc/mm/cache.c

+17 −3
Original line number Diff line number Diff line
@@ -1144,6 +1144,20 @@ noinline void __init arc_ioc_setup(void) 
{

	unsigned int ioc_base, mem_sz;



	/*

	 * If IOC was already enabled (due to bootloader) it technically needs to

	 * be reconfigured with aperture base,size corresponding to Linux memory map

	 * which will certainly be different than uboot's. But disabling and

	 * reenabling IOC when DMA might be potentially active is tricky business.

	 * To avoid random memory issues later, just panic here and ask user to

	 * upgrade bootloader to one which doesn't enable IOC

	 */

	if (read_aux_reg(ARC_REG_IO_COH_ENABLE) & ARC_IO_COH_ENABLE_BIT)

		panic("IOC already enabled, please upgrade bootloader!\n");



	if (!ioc_enable)

		return;



	/*

	 * As for today we don't support both IOC and ZONE_HIGHMEM enabled

	 * simultaneously. This happens because as of today IOC aperture covers
@@ -1187,8 +1201,8 @@ noinline void __init arc_ioc_setup(void) 
		panic("IOC Aperture start must be aligned to the size of the aperture");



	write_aux_reg(ARC_REG_IO_COH_AP0_BASE, ioc_base >> 12);

	write_aux_reg(ARC_REG_IO_COH_PARTIAL, 1);

	write_aux_reg(ARC_REG_IO_COH_ENABLE, 1);

	write_aux_reg(ARC_REG_IO_COH_PARTIAL, ARC_IO_COH_PARTIAL_BIT);

	write_aux_reg(ARC_REG_IO_COH_ENABLE, ARC_IO_COH_ENABLE_BIT);



	/* Re-enable L1 dcache */

	__dc_enable();
@@ -1265,7 +1279,7 @@ void __init arc_cache_init_master(void) 
	if (is_isa_arcv2() && l2_line_sz && !slc_enable)

		arc_slc_disable();



	if (is_isa_arcv2() && ioc_enable)

	if (is_isa_arcv2() && ioc_exists)

		arc_ioc_setup();



	if (is_isa_arcv2() && l2_line_sz && slc_enable) {