Commit a9d2d386 authored by Kyle McMartin's avatar Kyle McMartin Committed by Kyle McMartin
Browse files

[PARISC] Ensure Space ID hashing is turned off 



Check PDC_CACHE to see if spaceid hashing is turned on, and fail to
boot if that is the case.

However, some old machines do not implement the PDC_CACHE_RET_SPID
firmware call, so continue to boot if the call fails because of
PDC_BAD_OPTION (but fail in all other error returns).

Signed-off-by: default avatarKyle McMartin <kyle@parisc-linux.org>
parent e5a2e7fd

arch/parisc/kernel/cache.c

+9 −1
Original line number Diff line number Diff line
@@ -236,7 +236,8 @@ parisc_cache_init(void) 


void disable_sr_hashing(void)

{

	int srhash_type;

	int srhash_type, retval;

	unsigned long space_bits;



	switch (boot_cpu_data.cpu_type) {

	case pcx: /* We shouldn't get this far.  setup.c should prevent it. */
@@ -262,6 +263,13 @@ void disable_sr_hashing(void) 
	}



	disable_sr_hashing_asm(srhash_type);



	retval = pdc_spaceid_bits(&space_bits);

	/* If this procedure isn't implemented, don't panic. */

	if (retval < 0 && retval != PDC_BAD_OPTION)

		panic("pdc_spaceid_bits call failed.\n");

	if (space_bits != 0)

		panic("SpaceID hashing is still on!\n");

}



void flush_dcache_page(struct page *page)

arch/parisc/kernel/firmware.c

+20 −0
Original line number Diff line number Diff line
@@ -512,6 +512,26 @@ int pdc_cache_info(struct pdc_cache_info *cache_info) 
        return retval;

}



/**

 * pdc_spaceid_bits - Return whether Space ID hashing is turned on.

 * @space_bits: Should be 0, if not, bad mojo!

 *

 * Returns information about Space ID hashing.

 */

int pdc_spaceid_bits(unsigned long *space_bits)

{

	int retval;



	spin_lock_irq(&pdc_lock);

	pdc_result[0] = 0;

	retval = mem_pdc_call(PDC_CACHE, PDC_CACHE_RET_SPID, __pa(pdc_result), 0);

	convert_to_wide(pdc_result);

	*space_bits = pdc_result[0];

	spin_unlock_irq(&pdc_lock);



	return retval;

}



#ifndef CONFIG_PA20

/**

 * pdc_btlb_info - Return block TLB information.

include/asm-parisc/pdc.h

+1 −0
Original line number Diff line number Diff line
@@ -733,6 +733,7 @@ int pdc_model_cpuid(unsigned long *cpu_id); 
int pdc_model_versions(unsigned long *versions, int id);

int pdc_model_capabilities(unsigned long *capabilities);

int pdc_cache_info(struct pdc_cache_info *cache);

int pdc_spaceid_bits(unsigned long *space_bits);

#ifndef CONFIG_PA20

int pdc_btlb_info(struct pdc_btlb_info *btlb);

int pdc_mem_map_hpa(struct pdc_memory_map *r_addr, struct pdc_module_path *mod_path);

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