[PATCH V8 2/8] powerpc/memory: Parse new memory property to register blocks.
Michael Bringmann
mwb at linux.vnet.ibm.com
Thu Oct 27 02:24:16 AEDT 2016
powerpc/memory: Add parallel routines to parse the new property
"ibm,dynamic-memory-v2" property when it is present, and then to
register the relevant memory blocks with the operating system.
This property format is intended to provide a more compact
representation of memory when communicating with the front end
processor, especially when describing vast amounts of RAM.
[V2: Revise contant names.]
[V3: Fix error parsing the new memory block sets.]
[V4: Move a couple of function prototypes from header file
a later patch where first used.
Amend some comments.
Change a firmware architure vec check for scan actual device tree.
Compress some common code.]
[V5: Resynchronize/resubmit]
[V6: No change]
[V7: Correct mail threading]
[v8: Insert more useful variable names]
Signed-off-by: Michael Bringmann <mwb at linux.vnet.ibm.com>
---
arch/powerpc/include/asm/prom.h | 24 ++++++++--
arch/powerpc/kernel/prom.c | 97 ++++++++++++++++++++++++++++++++++++---
arch/powerpc/mm/numa.c | 22 ++++++++-
3 files changed, 129 insertions(+), 14 deletions(-)
diff --git a/arch/powerpc/include/asm/prom.h b/arch/powerpc/include/asm/prom.h
index bc7c4b5..43a002b 100644
--- a/arch/powerpc/include/asm/prom.h
+++ b/arch/powerpc/include/asm/prom.h
@@ -69,6 +69,8 @@ struct boot_param_header {
* OF address retreival & translation
*/
+extern int n_mem_addr_cells;
+
/* Parse the ibm,dma-window property of an OF node into the busno, phys and
* size parameters.
*/
@@ -81,8 +83,9 @@ extern void of_instantiate_rtc(void);
extern int of_get_ibm_chip_id(struct device_node *np);
/* The of_drconf_cell struct defines the layout of the LMB array
- * specified in the device tree property
- * ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory
+ * specified in the device tree properties,
+ * ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory
+ * ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory-v2
*/
struct of_drconf_cell {
u64 base_addr;
@@ -92,9 +95,20 @@ struct of_drconf_cell {
u32 flags;
};
-#define DRCONF_MEM_ASSIGNED 0x00000008
-#define DRCONF_MEM_AI_INVALID 0x00000040
-#define DRCONF_MEM_RESERVED 0x00000080
+#define DRCONF_MEM_ASSIGNED 0x00000008
+#define DRCONF_MEM_AI_INVALID 0x00000040
+#define DRCONF_MEM_RESERVED 0x00000080
+
+struct of_drconf_cell_v2 {
+ u32 num_seq_lmbs;
+ u64 base_addr;
+ u32 drc_index;
+ u32 aa_index;
+ u32 flags;
+} __attribute__((packed));
+
+extern void read_drconf_cell_v2(struct of_drconf_cell_v2 *drmem,
+ const __be32 **cellp);
/*
* There are two methods for telling firmware what our capabilities are.
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index b0245be..2d49887 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -443,23 +443,34 @@ static int __init early_init_dt_scan_chosen_ppc(unsigned long node,
#ifdef CONFIG_PPC_PSERIES
/*
- * Interpret the ibm,dynamic-memory property in the
- * /ibm,dynamic-reconfiguration-memory node.
+ * Retrieve and validate the ibm,lmb-size property for drconf memory
+ * from the flattened device tree.
+ */
+static u64 __init get_lmb_size(unsigned long node)
+{
+ const __be32 *ls;
+ int len;
+ ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &len);
+ if (!ls || len < dt_root_size_cells * sizeof(__be32))
+ return 0;
+ return dt_mem_next_cell(dt_root_size_cells, &ls);
+}
+
+/*
+ * Interpret the ibm,dynamic-memory property/ibm,dynamic-memory-v2
+ * in the /ibm,dynamic-reconfiguration-memory node.
* This contains a list of memory blocks along with NUMA affinity
* information.
*/
-static int __init early_init_dt_scan_drconf_memory(unsigned long node)
+static int __init early_init_dt_scan_drconf_memory_v1(unsigned long node)
{
- const __be32 *dm, *ls, *usm;
+ const __be32 *dm, *usm;
int l;
unsigned long n, flags;
u64 base, size, memblock_size;
unsigned int is_kexec_kdump = 0, rngs;
- ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
- if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
- return 0;
- memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
+ memblock_size = get_lmb_size(node);
dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
if (dm == NULL || l < sizeof(__be32))
@@ -518,6 +529,76 @@ static int __init early_init_dt_scan_drconf_memory(unsigned long node)
memblock_dump_all();
return 0;
}
+
+static int __init early_init_dt_scan_drconf_memory_v2(unsigned long node)
+{
+ const __be32 *dm;
+ int l;
+ unsigned long num_sets;
+ u64 size, base, memblock_size;
+
+ memblock_size = get_lmb_size(node);
+
+ dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory-v2", &l);
+ if (dm == NULL || l < sizeof(__be32))
+ return 0;
+
+ /* Verify expected length of the array of ibm,dynamic-memory-v2
+ * structs fits in the actual size of the property data.
+ */
+ num_sets = of_read_number(dm++, 1);
+ if (l < (num_sets * (dt_root_addr_cells + 4) + 1) * sizeof(__be32))
+ return 0;
+
+ if (n_mem_addr_cells == 0)
+ n_mem_addr_cells = dt_root_addr_cells;
+
+ for (; num_sets != 0; --num_sets) {
+ struct of_drconf_cell_v2 drmem;
+ unsigned long nsl;
+
+ read_drconf_cell_v2(&drmem, &dm);
+ base = drmem.base_addr;
+ nsl = drmem.num_seq_lmbs;
+ size = memblock_size;
+
+ /* SKip this block if the reserved bit is set in flags
+ * or if the block is not assigned to this partition
+ */
+ if ((drmem.flags & DRCONF_MEM_RESERVED) ||
+ !(drmem.flags & DRCONF_MEM_ASSIGNED))
+ continue;
+
+ for (; nsl != 0; nsl--) {
+ size = memblock_size;
+
+ if (iommu_is_off) {
+ if (base >= 0x80000000ul)
+ continue;
+ if ((base + size) > 0x80000000ul)
+ size = 0x80000000ul - base;
+ }
+ memblock_add(base, size);
+
+ base += size;
+ }
+ }
+
+ memblock_dump_all();
+ return 0;
+}
+
+static int __init early_init_dt_scan_drconf_memory(unsigned long node)
+{
+ const __be32 *dm;
+ int l;
+ dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory-v2", &l);
+ if (dm == NULL || l < sizeof(__be32))
+ return early_init_dt_scan_drconf_memory_v1(node);
+ else
+ return early_init_dt_scan_drconf_memory_v2(node);
+}
+
#else
#define early_init_dt_scan_drconf_memory(node) 0
#endif /* CONFIG_PPC_PSERIES */
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 75b9cd6..fe8e6e7 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -57,8 +57,10 @@ EXPORT_SYMBOL(node_to_cpumask_map);
EXPORT_SYMBOL(node_data);
static int min_common_depth;
-static int n_mem_addr_cells, n_mem_size_cells;
+int n_mem_addr_cells;
+static int n_mem_size_cells;
static int form1_affinity;
+EXPORT_SYMBOL(n_mem_addr_cells);
#define MAX_DISTANCE_REF_POINTS 4
static int distance_ref_points_depth;
@@ -405,6 +407,24 @@ static void read_drconf_cell(struct of_drconf_cell *drmem, const __be32 **cellp)
*cellp = cp + 4;
}
+
+ /*
+ * Retrieve and validate the ibm,dynamic-memory property of the device tree.
+ * Read the next memory block set entry from the ibm,dynamic-memory-v2 property
+ * and return the information in the provided of_drconf_cell_v2 structure.
+ */
+void read_drconf_cell_v2(struct of_drconf_cell_v2 *drmem, const __be32 **cellp)
+{
+ const __be32 *cp = (const __be32 *)*cellp;
+ drmem->num_seq_lmbs = be32_to_cpu(*cp++);
+ drmem->base_addr = read_n_cells(n_mem_addr_cells, &cp);
+ drmem->drc_index = be32_to_cpu(*cp++);
+ drmem->aa_index = be32_to_cpu(*cp++);
+ drmem->flags = be32_to_cpu(*cp++);
+
+ *cellp = cp;
+}
+EXPORT_SYMBOL(read_drconf_cell_v2);
/*
* Retrieve and validate the ibm,dynamic-memory property of the device tree.
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