[PATCH v02 2/5] powerpc/drmem: Add internal_flags feature
From: Michael Bringmann <hidden>
Date: 2018-06-29 22:13:13
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
powerpc/drmem: Add internal_flags field to each LMB to allow marking of kernel software-specific operations that need not be exported to other users. For instance, if information about selected LMBs needs to be maintained for subsequent passes through the system, it can be encoded into the LMB array itself without requiring the allocation and maintainance of additional data structures. Signed-off-by: Michael Bringmann <redacted> --- arch/powerpc/include/asm/drmem.h | 18 ++++++++++++++++++ arch/powerpc/mm/drmem.c | 2 ++ 2 files changed, 20 insertions(+)
diff --git a/arch/powerpc/include/asm/drmem.h b/arch/powerpc/include/asm/drmem.h
index b0e70fd..acb6539 100644
--- a/arch/powerpc/include/asm/drmem.h
+++ b/arch/powerpc/include/asm/drmem.h@@ -17,6 +17,7 @@ struct drmem_lmb { u32 drc_index; u32 aa_index; u32 flags; + u32 internal_flags; }; struct drmem_lmb_info {
@@ -101,6 +102,23 @@ static inline bool drmem_lmb_reserved(struct drmem_lmb *lmb) return lmb->flags & DRMEM_LMB_RESERVED; } +#define DRMEM_LMBINT_UPDATE 0x00000001 + +static inline void drmem_mark_lmb_update(struct drmem_lmb *lmb) +{ + lmb->internal_flags |= DRMEM_LMBINT_UPDATE; +} + +static inline void drmem_remove_lmb_update(struct drmem_lmb *lmb) +{ + lmb->internal_flags &= ~DRMEM_LMBINT_UPDATE; +} + +static inline bool drmem_lmb_update(struct drmem_lmb *lmb) +{ + return lmb->internal_flags & DRMEM_LMBINT_UPDATE; +} + u64 drmem_lmb_memory_max(void); void __init walk_drmem_lmbs(struct device_node *dn, void (*func)(struct drmem_lmb *, const __be32 **));
diff --git a/arch/powerpc/mm/drmem.c b/arch/powerpc/mm/drmem.c
index 13d2abb..fd2cae92 100644
--- a/arch/powerpc/mm/drmem.c
+++ b/arch/powerpc/mm/drmem.c@@ -207,6 +207,7 @@ static void read_drconf_v1_cell(struct drmem_lmb *lmb, lmb->aa_index = of_read_number(p++, 1); lmb->flags = of_read_number(p++, 1); + lmb->internal_flags = 0; *prop = p; }
@@ -265,6 +266,7 @@ static void __walk_drmem_v2_lmbs(const __be32 *prop, const __be32 *usm, lmb.aa_index = dr_cell.aa_index; lmb.flags = dr_cell.flags; + lmb.internal_flags = 0; func(&lmb, &usm); }