f7fe93344f
Adrian Bunk reported that enabling 4MB page size breaks the build. The problem is that MAX_ORDER combined with the page shift exceeds the SECTION_SIZE_BITS we use in asm-sparc64/sparsemem.h There are several ways I suppose we could work around this. For one we could define a CONFIG_FORCE_MAX_ZONEORDER to decrease MAX_ORDER in these higher page size cases. But I also know that these page size cases are broken wrt. TLB miss handling especially on pre-hypervisor systems, and there isn't an easy way to fix that. These options were meant to be fun experimental hacks anyways, and only 8K and 64K make any sense to support. So remove 512K and 4M base page size support. Of course, we still support these page sizes for huge pages. Signed-off-by: David S. Miller <davem@davemloft.net>
124 lines
3.4 KiB
C
124 lines
3.4 KiB
C
#ifndef __MMU_H
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#define __MMU_H
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#include <linux/const.h>
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#include <asm/page.h>
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#include <asm/hypervisor.h>
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#define CTX_NR_BITS 13
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#define TAG_CONTEXT_BITS ((_AC(1,UL) << CTX_NR_BITS) - _AC(1,UL))
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/* UltraSPARC-III+ and later have a feature whereby you can
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* select what page size the various Data-TLB instances in the
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* chip. In order to gracefully support this, we put the version
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* field in a spot outside of the areas of the context register
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* where this parameter is specified.
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*/
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#define CTX_VERSION_SHIFT 22
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#define CTX_VERSION_MASK ((~0UL) << CTX_VERSION_SHIFT)
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#define CTX_PGSZ_8KB _AC(0x0,UL)
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#define CTX_PGSZ_64KB _AC(0x1,UL)
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#define CTX_PGSZ_512KB _AC(0x2,UL)
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#define CTX_PGSZ_4MB _AC(0x3,UL)
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#define CTX_PGSZ_BITS _AC(0x7,UL)
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#define CTX_PGSZ0_NUC_SHIFT 61
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#define CTX_PGSZ1_NUC_SHIFT 58
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#define CTX_PGSZ0_SHIFT 16
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#define CTX_PGSZ1_SHIFT 19
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#define CTX_PGSZ_MASK ((CTX_PGSZ_BITS << CTX_PGSZ0_SHIFT) | \
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(CTX_PGSZ_BITS << CTX_PGSZ1_SHIFT))
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#if defined(CONFIG_SPARC64_PAGE_SIZE_8KB)
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#define CTX_PGSZ_BASE CTX_PGSZ_8KB
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#elif defined(CONFIG_SPARC64_PAGE_SIZE_64KB)
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#define CTX_PGSZ_BASE CTX_PGSZ_64KB
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#else
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#error No page size specified in kernel configuration
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#endif
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#if defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
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#define CTX_PGSZ_HUGE CTX_PGSZ_4MB
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
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#define CTX_PGSZ_HUGE CTX_PGSZ_512KB
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
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#define CTX_PGSZ_HUGE CTX_PGSZ_64KB
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#endif
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#define CTX_PGSZ_KERN CTX_PGSZ_4MB
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/* Thus, when running on UltraSPARC-III+ and later, we use the following
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* PRIMARY_CONTEXT register values for the kernel context.
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*/
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#define CTX_CHEETAH_PLUS_NUC \
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((CTX_PGSZ_KERN << CTX_PGSZ0_NUC_SHIFT) | \
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(CTX_PGSZ_BASE << CTX_PGSZ1_NUC_SHIFT))
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#define CTX_CHEETAH_PLUS_CTX0 \
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((CTX_PGSZ_KERN << CTX_PGSZ0_SHIFT) | \
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(CTX_PGSZ_BASE << CTX_PGSZ1_SHIFT))
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/* If you want "the TLB context number" use CTX_NR_MASK. If you
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* want "the bits I program into the context registers" use
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* CTX_HW_MASK.
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*/
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#define CTX_NR_MASK TAG_CONTEXT_BITS
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#define CTX_HW_MASK (CTX_NR_MASK | CTX_PGSZ_MASK)
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#define CTX_FIRST_VERSION ((_AC(1,UL) << CTX_VERSION_SHIFT) + _AC(1,UL))
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#define CTX_VALID(__ctx) \
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(!(((__ctx.sparc64_ctx_val) ^ tlb_context_cache) & CTX_VERSION_MASK))
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#define CTX_HWBITS(__ctx) ((__ctx.sparc64_ctx_val) & CTX_HW_MASK)
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#define CTX_NRBITS(__ctx) ((__ctx.sparc64_ctx_val) & CTX_NR_MASK)
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#ifndef __ASSEMBLY__
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#define TSB_ENTRY_ALIGNMENT 16
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struct tsb {
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unsigned long tag;
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unsigned long pte;
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} __attribute__((aligned(TSB_ENTRY_ALIGNMENT)));
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extern void __tsb_insert(unsigned long ent, unsigned long tag, unsigned long pte);
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extern void tsb_flush(unsigned long ent, unsigned long tag);
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extern void tsb_init(struct tsb *tsb, unsigned long size);
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struct tsb_config {
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struct tsb *tsb;
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unsigned long tsb_rss_limit;
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unsigned long tsb_nentries;
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unsigned long tsb_reg_val;
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unsigned long tsb_map_vaddr;
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unsigned long tsb_map_pte;
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};
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#define MM_TSB_BASE 0
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#ifdef CONFIG_HUGETLB_PAGE
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#define MM_TSB_HUGE 1
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#define MM_NUM_TSBS 2
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#else
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#define MM_NUM_TSBS 1
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#endif
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typedef struct {
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spinlock_t lock;
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unsigned long sparc64_ctx_val;
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unsigned long huge_pte_count;
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struct tsb_config tsb_block[MM_NUM_TSBS];
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struct hv_tsb_descr tsb_descr[MM_NUM_TSBS];
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} mm_context_t;
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#endif /* !__ASSEMBLY__ */
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#define TSB_CONFIG_TSB 0x00
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#define TSB_CONFIG_RSS_LIMIT 0x08
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#define TSB_CONFIG_NENTRIES 0x10
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#define TSB_CONFIG_REG_VAL 0x18
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#define TSB_CONFIG_MAP_VADDR 0x20
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#define TSB_CONFIG_MAP_PTE 0x28
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#endif /* __MMU_H */
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