diff options
Diffstat (limited to 'arch/powerpc/platforms/pseries/lpar.c')
-rw-r--r-- | arch/powerpc/platforms/pseries/lpar.c | 295 |
1 files changed, 280 insertions, 15 deletions
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c index d3992ced0782..32d4452973e7 100644 --- a/arch/powerpc/platforms/pseries/lpar.c +++ b/arch/powerpc/platforms/pseries/lpar.c @@ -48,6 +48,7 @@ #include <asm/kexec.h> #include <asm/fadump.h> #include <asm/asm-prototypes.h> +#include <asm/debugfs.h> #include "pseries.h" @@ -417,6 +418,79 @@ static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn, BUG_ON(lpar_rc != H_SUCCESS); } + +/* + * As defined in the PAPR's section 14.5.4.1.8 + * The control mask doesn't include the returned reference and change bit from + * the processed PTE. + */ +#define HBLKR_AVPN 0x0100000000000000UL +#define HBLKR_CTRL_MASK 0xf800000000000000UL +#define HBLKR_CTRL_SUCCESS 0x8000000000000000UL +#define HBLKR_CTRL_ERRNOTFOUND 0x8800000000000000UL +#define HBLKR_CTRL_ERRBUSY 0xa000000000000000UL + +/** + * H_BLOCK_REMOVE caller. + * @idx should point to the latest @param entry set with a PTEX. + * If PTE cannot be processed because another CPUs has already locked that + * group, those entries are put back in @param starting at index 1. + * If entries has to be retried and @retry_busy is set to true, these entries + * are retried until success. If @retry_busy is set to false, the returned + * is the number of entries yet to process. + */ +static unsigned long call_block_remove(unsigned long idx, unsigned long *param, + bool retry_busy) +{ + unsigned long i, rc, new_idx; + unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; + + if (idx < 2) { + pr_warn("Unexpected empty call to H_BLOCK_REMOVE"); + return 0; + } +again: + new_idx = 0; + if (idx > PLPAR_HCALL9_BUFSIZE) { + pr_err("Too many PTEs (%lu) for H_BLOCK_REMOVE", idx); + idx = PLPAR_HCALL9_BUFSIZE; + } else if (idx < PLPAR_HCALL9_BUFSIZE) + param[idx] = HBR_END; + + rc = plpar_hcall9(H_BLOCK_REMOVE, retbuf, + param[0], /* AVA */ + param[1], param[2], param[3], param[4], /* TS0-7 */ + param[5], param[6], param[7], param[8]); + if (rc == H_SUCCESS) + return 0; + + BUG_ON(rc != H_PARTIAL); + + /* Check that the unprocessed entries were 'not found' or 'busy' */ + for (i = 0; i < idx-1; i++) { + unsigned long ctrl = retbuf[i] & HBLKR_CTRL_MASK; + + if (ctrl == HBLKR_CTRL_ERRBUSY) { + param[++new_idx] = param[i+1]; + continue; + } + + BUG_ON(ctrl != HBLKR_CTRL_SUCCESS + && ctrl != HBLKR_CTRL_ERRNOTFOUND); + } + + /* + * If there were entries found busy, retry these entries if requested, + * of if all the entries have to be retried. + */ + if (new_idx && (retry_busy || new_idx == (PLPAR_HCALL9_BUFSIZE-1))) { + idx = new_idx + 1; + goto again; + } + + return new_idx; +} + #ifdef CONFIG_TRANSPARENT_HUGEPAGE /* * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need @@ -424,17 +498,57 @@ static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn, */ #define PPC64_HUGE_HPTE_BATCH 12 -static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot, - unsigned long *vpn, int count, - int psize, int ssize) +static void hugepage_block_invalidate(unsigned long *slot, unsigned long *vpn, + int count, int psize, int ssize) { unsigned long param[PLPAR_HCALL9_BUFSIZE]; - int i = 0, pix = 0, rc; - unsigned long flags = 0; - int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); + unsigned long shift, current_vpgb, vpgb; + int i, pix = 0; - if (lock_tlbie) - spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); + shift = mmu_psize_defs[psize].shift; + + for (i = 0; i < count; i++) { + /* + * Shifting 3 bits more on the right to get a + * 8 pages aligned virtual addresse. + */ + vpgb = (vpn[i] >> (shift - VPN_SHIFT + 3)); + if (!pix || vpgb != current_vpgb) { + /* + * Need to start a new 8 pages block, flush + * the current one if needed. + */ + if (pix) + (void)call_block_remove(pix, param, true); + current_vpgb = vpgb; + param[0] = hpte_encode_avpn(vpn[i], psize, ssize); + pix = 1; + } + + param[pix++] = HBR_REQUEST | HBLKR_AVPN | slot[i]; + if (pix == PLPAR_HCALL9_BUFSIZE) { + pix = call_block_remove(pix, param, false); + /* + * pix = 0 means that all the entries were + * removed, we can start a new block. + * Otherwise, this means that there are entries + * to retry, and pix points to latest one, so + * we should increment it and try to continue + * the same block. + */ + if (pix) + pix++; + } + } + if (pix) + (void)call_block_remove(pix, param, true); +} + +static void hugepage_bulk_invalidate(unsigned long *slot, unsigned long *vpn, + int count, int psize, int ssize) +{ + unsigned long param[PLPAR_HCALL9_BUFSIZE]; + int i = 0, pix = 0, rc; for (i = 0; i < count; i++) { @@ -462,6 +576,23 @@ static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot, param[6], param[7]); BUG_ON(rc != H_SUCCESS); } +} + +static inline void __pSeries_lpar_hugepage_invalidate(unsigned long *slot, + unsigned long *vpn, + int count, int psize, + int ssize) +{ + unsigned long flags = 0; + int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); + + if (lock_tlbie) + spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); + + if (firmware_has_feature(FW_FEATURE_BLOCK_REMOVE)) + hugepage_block_invalidate(slot, vpn, count, psize, ssize); + else + hugepage_bulk_invalidate(slot, vpn, count, psize, ssize); if (lock_tlbie) spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); @@ -546,6 +677,86 @@ static int pSeries_lpar_hpte_removebolted(unsigned long ea, return 0; } + +static inline unsigned long compute_slot(real_pte_t pte, + unsigned long vpn, + unsigned long index, + unsigned long shift, + int ssize) +{ + unsigned long slot, hash, hidx; + + hash = hpt_hash(vpn, shift, ssize); + hidx = __rpte_to_hidx(pte, index); + if (hidx & _PTEIDX_SECONDARY) + hash = ~hash; + slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; + slot += hidx & _PTEIDX_GROUP_IX; + return slot; +} + +/** + * The hcall H_BLOCK_REMOVE implies that the virtual pages to processed are + * "all within the same naturally aligned 8 page virtual address block". + */ +static void do_block_remove(unsigned long number, struct ppc64_tlb_batch *batch, + unsigned long *param) +{ + unsigned long vpn; + unsigned long i, pix = 0; + unsigned long index, shift, slot, current_vpgb, vpgb; + real_pte_t pte; + int psize, ssize; + + psize = batch->psize; + ssize = batch->ssize; + + for (i = 0; i < number; i++) { + vpn = batch->vpn[i]; + pte = batch->pte[i]; + pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { + /* + * Shifting 3 bits more on the right to get a + * 8 pages aligned virtual addresse. + */ + vpgb = (vpn >> (shift - VPN_SHIFT + 3)); + if (!pix || vpgb != current_vpgb) { + /* + * Need to start a new 8 pages block, flush + * the current one if needed. + */ + if (pix) + (void)call_block_remove(pix, param, + true); + current_vpgb = vpgb; + param[0] = hpte_encode_avpn(vpn, psize, + ssize); + pix = 1; + } + + slot = compute_slot(pte, vpn, index, shift, ssize); + param[pix++] = HBR_REQUEST | HBLKR_AVPN | slot; + + if (pix == PLPAR_HCALL9_BUFSIZE) { + pix = call_block_remove(pix, param, false); + /* + * pix = 0 means that all the entries were + * removed, we can start a new block. + * Otherwise, this means that there are entries + * to retry, and pix points to latest one, so + * we should increment it and try to continue + * the same block. + */ + if (pix) + pix++; + } + } pte_iterate_hashed_end(); + } + + if (pix) + (void)call_block_remove(pix, param, true); +} + /* * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie * lock. @@ -558,13 +769,18 @@ static void pSeries_lpar_flush_hash_range(unsigned long number, int local) struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch); int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); unsigned long param[PLPAR_HCALL9_BUFSIZE]; - unsigned long hash, index, shift, hidx, slot; + unsigned long index, shift, slot; real_pte_t pte; int psize, ssize; if (lock_tlbie) spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); + if (firmware_has_feature(FW_FEATURE_BLOCK_REMOVE)) { + do_block_remove(number, batch, param); + goto out; + } + psize = batch->psize; ssize = batch->ssize; pix = 0; @@ -572,12 +788,7 @@ static void pSeries_lpar_flush_hash_range(unsigned long number, int local) vpn = batch->vpn[i]; pte = batch->pte[i]; pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { - hash = hpt_hash(vpn, shift, ssize); - hidx = __rpte_to_hidx(pte, index); - if (hidx & _PTEIDX_SECONDARY) - hash = ~hash; - slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; - slot += hidx & _PTEIDX_GROUP_IX; + slot = compute_slot(pte, vpn, index, shift, ssize); if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { /* * lpar doesn't use the passed actual page size @@ -608,6 +819,7 @@ static void pSeries_lpar_flush_hash_range(unsigned long number, int local) BUG_ON(rc != H_SUCCESS); } +out: if (lock_tlbie) spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); } @@ -1028,3 +1240,56 @@ static int __init reserve_vrma_context_id(void) return 0; } machine_device_initcall(pseries, reserve_vrma_context_id); + +#ifdef CONFIG_DEBUG_FS +/* debugfs file interface for vpa data */ +static ssize_t vpa_file_read(struct file *filp, char __user *buf, size_t len, + loff_t *pos) +{ + int cpu = (long)filp->private_data; + struct lppaca *lppaca = &lppaca_of(cpu); + + return simple_read_from_buffer(buf, len, pos, lppaca, + sizeof(struct lppaca)); +} + +static const struct file_operations vpa_fops = { + .open = simple_open, + .read = vpa_file_read, + .llseek = default_llseek, +}; + +static int __init vpa_debugfs_init(void) +{ + char name[16]; + long i; + static struct dentry *vpa_dir; + + if (!firmware_has_feature(FW_FEATURE_SPLPAR)) + return 0; + + vpa_dir = debugfs_create_dir("vpa", powerpc_debugfs_root); + if (!vpa_dir) { + pr_warn("%s: can't create vpa root dir\n", __func__); + return -ENOMEM; + } + + /* set up the per-cpu vpa file*/ + for_each_possible_cpu(i) { + struct dentry *d; + + sprintf(name, "cpu-%ld", i); + + d = debugfs_create_file(name, 0400, vpa_dir, (void *)i, + &vpa_fops); + if (!d) { + pr_warn("%s: can't create per-cpu vpa file\n", + __func__); + return -ENOMEM; + } + } + + return 0; +} +machine_arch_initcall(pseries, vpa_debugfs_init); +#endif /* CONFIG_DEBUG_FS */ |