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parisc: BTLB: Initialize BTLB tables at CPU startup
Initialize the BTLB entries when starting up a CPU. Note that BTLBs are not available on 64-bit CPUs. Signed-off-by: Helge Deller <deller@gmx.de>
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@ -37,6 +37,7 @@ extern int split_tlb;
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extern int dcache_stride;
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extern int icache_stride;
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extern struct pdc_cache_info cache_info;
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extern struct pdc_btlb_info btlb_info;
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void parisc_setup_cache_timing(void);
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#define pdtlb(sr, addr) asm volatile("pdtlb 0(%%sr%0,%1)" \
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@ -310,6 +310,7 @@ extern void do_syscall_trace_exit(struct pt_regs *);
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struct seq_file;
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extern void early_trap_init(void);
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extern void collect_boot_cpu_data(void);
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extern void btlb_init_per_cpu(void);
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extern int show_cpuinfo (struct seq_file *m, void *v);
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/* driver code in driver/parisc */
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@ -58,7 +58,7 @@ int pa_serialize_tlb_flushes __ro_after_init;
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struct pdc_cache_info cache_info __ro_after_init;
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#ifndef CONFIG_PA20
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static struct pdc_btlb_info btlb_info __ro_after_init;
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struct pdc_btlb_info btlb_info __ro_after_init;
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#endif
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DEFINE_STATIC_KEY_TRUE(parisc_has_cache);
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@ -264,12 +264,6 @@ parisc_cache_init(void)
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icache_stride = CAFL_STRIDE(cache_info.ic_conf);
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#undef CAFL_STRIDE
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#ifndef CONFIG_PA20
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if (pdc_btlb_info(&btlb_info) < 0) {
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memset(&btlb_info, 0, sizeof btlb_info);
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}
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#endif
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if ((boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) ==
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PDC_MODEL_NVA_UNSUPPORTED) {
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printk(KERN_WARNING "parisc_cache_init: Only equivalent aliasing supported!\n");
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@ -368,6 +368,8 @@ int init_per_cpu(int cpunum)
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/* FUTURE: Enable Performance Monitor : ccr bit 0x20 */
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init_percpu_prof(cpunum);
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btlb_init_per_cpu();
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return ret;
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}
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@ -32,6 +32,7 @@
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#include <asm/sections.h>
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#include <asm/msgbuf.h>
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#include <asm/sparsemem.h>
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#include <asm/asm-offsets.h>
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extern int data_start;
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extern void parisc_kernel_start(void); /* Kernel entry point in head.S */
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@ -720,6 +721,77 @@ void __init paging_init(void)
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parisc_bootmem_free();
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}
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static void alloc_btlb(unsigned long start, unsigned long end, int *slot,
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unsigned long entry_info)
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{
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const int slot_max = btlb_info.fixed_range_info.num_comb;
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int min_num_pages = btlb_info.min_size;
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unsigned long size;
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/* map at minimum 4 pages */
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if (min_num_pages < 4)
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min_num_pages = 4;
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size = HUGEPAGE_SIZE;
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while (start < end && *slot < slot_max && size >= PAGE_SIZE) {
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/* starting address must have same alignment as size! */
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/* if correctly aligned and fits in double size, increase */
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if (((start & (2 * size - 1)) == 0) &&
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(end - start) >= (2 * size)) {
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size <<= 1;
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continue;
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}
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/* if current size alignment is too big, try smaller size */
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if ((start & (size - 1)) != 0) {
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size >>= 1;
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continue;
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}
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if ((end - start) >= size) {
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if ((size >> PAGE_SHIFT) >= min_num_pages)
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pdc_btlb_insert(start >> PAGE_SHIFT, __pa(start) >> PAGE_SHIFT,
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size >> PAGE_SHIFT, entry_info, *slot);
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(*slot)++;
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start += size;
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continue;
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}
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size /= 2;
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continue;
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}
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}
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void btlb_init_per_cpu(void)
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{
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unsigned long s, t, e;
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int slot;
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/* BTLBs are not available on 64-bit CPUs */
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if (IS_ENABLED(CONFIG_PA20))
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return;
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else if (pdc_btlb_info(&btlb_info) < 0) {
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memset(&btlb_info, 0, sizeof btlb_info);
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}
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/* insert BLTLBs for code and data segments */
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s = (uintptr_t) dereference_function_descriptor(&_stext);
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e = (uintptr_t) dereference_function_descriptor(&_etext);
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t = (uintptr_t) dereference_function_descriptor(&_sdata);
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BUG_ON(t != e);
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/* code segments */
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slot = 0;
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alloc_btlb(s, e, &slot, 0x13800000);
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/* sanity check */
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t = (uintptr_t) dereference_function_descriptor(&_edata);
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e = (uintptr_t) dereference_function_descriptor(&__bss_start);
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BUG_ON(t != e);
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/* data segments */
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s = (uintptr_t) dereference_function_descriptor(&_sdata);
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e = (uintptr_t) dereference_function_descriptor(&__bss_stop);
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alloc_btlb(s, e, &slot, 0x11800000);
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}
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#ifdef CONFIG_PA20
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/*
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