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Commit 9048e648 authored by Alexander Graf's avatar Alexander Graf Committed by Benjamin Herrenschmidt
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powerpc: Use 64k io pages when we never see an HEA 



When we never get around to seeing an HEA ethernet adapter, there's
no point in restricting ourselves to 4k IO page size.

This speeds up IO maps when CONFIG_IBMEBUS is disabled.

[ Updated the test to also lift the restriction on arch 2.07
  (Power 8) which cannot have an HEA
 -- BenH ]

Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>

foo
parent 00f554fa

arch/powerpc/mm/hash_utils_64.c

+22 −3
Original line number Diff line number Diff line
@@ -445,6 +445,24 @@ static void mmu_psize_set_default_penc(void) 
			mmu_psize_defs[bpsize].penc[apsize] = -1;

}



#ifdef CONFIG_PPC_64K_PAGES



static bool might_have_hea(void)

{

	/*

	 * The HEA ethernet adapter requires awareness of the

	 * GX bus. Without that awareness we can easily assume

	 * we will never see an HEA ethernet device.

	 */

#ifdef CONFIG_IBMEBUS

	return !cpu_has_feature(CPU_FTR_ARCH_207S);

#else

	return false;

#endif

}



#endif /* #ifdef CONFIG_PPC_64K_PAGES */



static void __init htab_init_page_sizes(void)

{

	int rc;
@@ -499,10 +517,11 @@ static void __init htab_init_page_sizes(void) 
			mmu_linear_psize = MMU_PAGE_64K;

		if (mmu_has_feature(MMU_FTR_CI_LARGE_PAGE)) {

			/*

			 * Don't use 64k pages for ioremap on pSeries, since

			 * that would stop us accessing the HEA ethernet.

			 * When running on pSeries using 64k pages for ioremap

			 * would stop us accessing the HEA ethernet. So if we

			 * have the chance of ever seeing one, stay at 4k.

			 */

			if (!machine_is(pseries))

			if (!might_have_hea() || !machine_is(pseries))

				mmu_io_psize = MMU_PAGE_64K;

		} else

			mmu_ci_restrictions = 1;