[kvm-unit-tests PATCH v5 13/18] powerpc/ppc64: adapt arm's setup

[Andrew Jones <drjones@redhat.com>]

Copy arm's setup code (also DT based) over to powerpc, adapting
it a bit. Also bring over arm's setup selftest, giving powerpc
its first test.

The largest change from arm's setup.c is that instead of using a
hardcoded SMP_CACHE_BYTES, cpu_set() is extended to extract the
line size from the cpu DT nodes. That change also requires that
we call cpu_init() before mem_init() in setup().

Signed-off-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Tested-by: Laurent Vivier <lvivier@redhat.com>
---
 lib/powerpc/asm/setup.h |  30 +++++++++++
 lib/powerpc/setup.c     | 141 ++++++++++++++++++++++++++++++++++++++++++++++++
 lib/ppc64/asm/setup.h   |   1 +
 powerpc/Makefile.common |   1 +
 powerpc/cstart64.S      |  16 +++++-
 powerpc/selftest.c      |  63 ++++++++++++++++++++--
 6 files changed, 248 insertions(+), 4 deletions(-)
 create mode 100644 lib/powerpc/asm/setup.h
 create mode 100644 lib/powerpc/setup.c
 create mode 100644 lib/ppc64/asm/setup.h

diff --git a/lib/powerpc/asm/setup.h b/lib/powerpc/asm/setup.h
new file mode 100644
index 0000000000000..8288ff37ff1b9
--- /dev/null
+++ b/lib/powerpc/asm/setup.h
@@ -0,0 +1,30 @@
+#ifndef _ASMPOWERPC_SETUP_H_
+#define _ASMPOWERPC_SETUP_H_
+/*
+ * Copyright (C) 2016, Red Hat Inc, Andrew Jones <drjones@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.
+ */
+#include <libcflat.h>
+#include <alloc.h>	/* phys_addr_t */
+
+#define NR_CPUS			8	/* arbitrarily set for now */
+extern u32 cpus[NR_CPUS];
+extern int nr_cpus;
+
+#define NR_MEM_REGIONS		8
+#define MR_F_PRIMARY		(1U << 0)
+struct mem_region {
+	phys_addr_t start;
+	phys_addr_t end;
+	unsigned int flags;
+};
+extern struct mem_region mem_regions[NR_MEM_REGIONS];
+extern phys_addr_t __physical_start, __physical_end;
+extern unsigned __smp_cache_bytes;
+
+#define PHYSICAL_START		(__physical_start)
+#define PHYSICAL_END		(__physical_end)
+#define SMP_CACHE_BYTES		(__smp_cache_bytes)
+
+#endif /* _ASMPOWERPC_SETUP_H_ */
diff --git a/lib/powerpc/setup.c b/lib/powerpc/setup.c
new file mode 100644
index 0000000000000..70f50deb9bacf
--- /dev/null
+++ b/lib/powerpc/setup.c
@@ -0,0 +1,141 @@
+/*
+ * Initialize machine setup information and I/O.
+ *
+ * After running setup() unit tests may query how many cpus they have
+ * (nr_cpus), how much memory they have (PHYSICAL_END - PHYSICAL_START),
+ * may use dynamic memory allocation (malloc, etc.), printf, and exit.
+ * Finally, argc and argv are also ready to be passed to main().
+ *
+ * Copyright (C) 2016, Red Hat Inc, Andrew Jones <drjones@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.
+ */
+#include <libcflat.h>
+#include <libfdt/libfdt.h>
+#include <devicetree.h>
+#include <alloc.h>
+#include <asm/setup.h>
+#include <asm/page.h>
+
+extern unsigned long stacktop;
+extern void io_init(void);
+extern void setup_args(const char *args);
+
+u32 cpus[NR_CPUS] = { [0 ... NR_CPUS-1] = (~0U) };
+int nr_cpus;
+
+struct mem_region mem_regions[NR_MEM_REGIONS];
+phys_addr_t __physical_start, __physical_end;
+unsigned __smp_cache_bytes;
+
+static void cpu_set(int fdtnode, u32 regval, void *info)
+{
+	const struct fdt_property *prop;
+	unsigned *max_linesz = (unsigned *)info, sz;
+	int cpu = nr_cpus++;
+	u32 *data;
+
+	if (cpu >= NR_CPUS) {
+		printf("Number cpus exceeds maximum supported (%d).\n",
+			NR_CPUS);
+		assert(0);
+	}
+	cpus[cpu] = regval;
+
+	prop = fdt_get_property(dt_fdt(), fdtnode, "i-cache-line-size", NULL);
+	assert(prop != NULL);
+	data = (u32 *)prop->data;
+	sz = fdt32_to_cpu(*data);
+
+	if (*max_linesz < sz)
+		*max_linesz = sz;
+
+	prop = fdt_get_property(dt_fdt(), fdtnode, "d-cache-line-size", NULL);
+	assert(prop != NULL);
+	data = (u32 *)prop->data;
+	sz = fdt32_to_cpu(*data);
+
+	if (*max_linesz < sz)
+		*max_linesz = sz;
+}
+
+static void cpu_init(void)
+{
+	unsigned max_linesz = 0;
+	int ret;
+
+	nr_cpus = 0;
+	ret = dt_for_each_cpu_node(cpu_set, &max_linesz);
+	assert(ret == 0);
+	__smp_cache_bytes = max_linesz;
+}
+
+static void mem_init(phys_addr_t freemem_start)
+{
+	struct dt_pbus_reg regs[NR_MEM_REGIONS];
+	struct mem_region primary, mem = {
+		.start = (phys_addr_t)-1,
+	};
+	int nr_regs, i;
+
+	nr_regs = dt_get_memory_params(regs, NR_MEM_REGIONS);
+	assert(nr_regs > 0);
+
+	primary.end = 0;
+
+	for (i = 0; i < nr_regs; ++i) {
+		mem_regions[i].start = regs[i].addr;
+		mem_regions[i].end = regs[i].addr + regs[i].size;
+
+		/*
+		 * pick the region we're in for our primary region
+		 */
+		if (freemem_start >= mem_regions[i].start
+				&& freemem_start < mem_regions[i].end) {
+			mem_regions[i].flags |= MR_F_PRIMARY;
+			primary = mem_regions[i];
+		}
+
+		/*
+		 * set the lowest and highest addresses found,
+		 * ignoring potential gaps
+		 */
+		if (mem_regions[i].start < mem.start)
+			mem.start = mem_regions[i].start;
+		if (mem_regions[i].end > mem.end)
+			mem.end = mem_regions[i].end;
+	}
+	assert(primary.end != 0);
+//	assert(!(mem.start & ~PHYS_MASK) && !((mem.end - 1) & ~PHYS_MASK));
+
+	__physical_start = mem.start;	/* PHYSICAL_START */
+	__physical_end = mem.end;	/* PHYSICAL_END */
+
+	phys_alloc_init(freemem_start, primary.end - freemem_start);
+	phys_alloc_set_minimum_alignment(SMP_CACHE_BYTES);
+}
+
+void setup(const void *fdt)
+{
+	const char *bootargs;
+	u32 fdt_size;
+	int ret;
+
+	/*
+	 * Move the fdt to just above the stack. The free memory
+	 * then starts just after the fdt.
+	 */
+	fdt_size = fdt_totalsize(fdt);
+	ret = fdt_move(fdt, &stacktop, fdt_size);
+	assert(ret == 0);
+	ret = dt_init(&stacktop);
+	assert(ret == 0);
+
+	cpu_init();
+	mem_init(PAGE_ALIGN((unsigned long)&stacktop + fdt_size));
+	io_init();
+
+	ret = dt_get_bootargs(&bootargs);
+	assert(ret == 0);
+	setup_args(bootargs);
+}
diff --git a/lib/ppc64/asm/setup.h b/lib/ppc64/asm/setup.h
new file mode 100644
index 0000000000000..20192985928a4
--- /dev/null
+++ b/lib/ppc64/asm/setup.h
@@ -0,0 +1 @@
+#include "../../powerpc/asm/setup.h"
diff --git a/powerpc/Makefile.common b/powerpc/Makefile.common
index b21e3933d0643..539bd33d1c309 100644
--- a/powerpc/Makefile.common
+++ b/powerpc/Makefile.common
@@ -26,6 +26,7 @@ cflatobjs += lib/alloc.o
 cflatobjs += lib/devicetree.o
 cflatobjs += lib/powerpc/io.o
 cflatobjs += lib/powerpc/hcall.o
+cflatobjs += lib/powerpc/setup.o
 
 libgcc := $(shell $(CC) $(machine) --print-libgcc-file-name)
 
diff --git a/powerpc/cstart64.S b/powerpc/cstart64.S
index 1884d79871ba5..526452835754f 100644
--- a/powerpc/cstart64.S
+++ b/powerpc/cstart64.S
@@ -20,11 +20,17 @@
 
 .section .init
 
+/*
+ * start is the entry point. r3 points to the DTB
+ */
 .globl start
 start:
 	LOAD_REG_IMMEDIATE(r1, stackptr)
 	LOAD_REG_IMMEDIATE(r2, tocptr)
 
+	/* save DTB pointer */
+	std	r3, 56(r1)
+
 	/* patch sc1 if needed */
 	bl	hcall_have_broken_sc1
 	cmpwi	r3, 0
@@ -33,7 +39,15 @@ start:
 	LOAD_REG_IMMEDIATE(r4, SC1_REPLACEMENT)
 	stw	r4, 0(r3)
 
-1:	bl	main
+	/* complete setup */
+1:	ld	r3, 56(r1)
+	bl	setup
+
+	/* run the test */
+	LOAD_REG_IMMEDIATE(r5, __argc)
+	LOAD_REG_IMMEDIATE(r4, __argv)
+	lwz	r3, 0(r5)
+	bl	main
 	bl	exit
 	b	halt
 
diff --git a/powerpc/selftest.c b/powerpc/selftest.c
index 2f2a5215dd55c..84867e482d2a2 100644
--- a/powerpc/selftest.c
+++ b/powerpc/selftest.c
@@ -1,7 +1,64 @@
+/*
+ * Test the framework itself. These tests confirm that setup works.
+ *
+ * Copyright (C) 2016, Red Hat Inc, Andrew Jones <drjones@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.
+ */
 #include <libcflat.h>
+#include <util.h>
+#include <asm/setup.h>
 
-int main(void)
+static void check_setup(int argc, char **argv)
 {
-	printf("hello world\n");
-	return 0;
+	int nr_tests = 0, len, i;
+	long val;
+
+	for (i = 0; i < argc; ++i) {
+
+		len = parse_keyval(argv[i], &val);
+		if (len == -1)
+			continue;
+
+		argv[i][len] = '\0';
+		report_prefix_push(argv[i]);
+
+		if (strcmp(argv[i], "mem") == 0) {
+
+			phys_addr_t memsize = PHYSICAL_END - PHYSICAL_START;
+			phys_addr_t expected = ((phys_addr_t)val)*1024*1024;
+
+			report("size = %d MB", memsize == expected,
+							memsize/1024/1024);
+			++nr_tests;
+
+		} else if (strcmp(argv[i], "smp") == 0) {
+
+			report("nr_cpus = %d", nr_cpus == (int)val, nr_cpus);
+			++nr_tests;
+		}
+
+		report_prefix_pop();
+	}
+
+	if (nr_tests < 2)
+		report_abort("missing input");
+}
+
+int main(int argc, char **argv)
+{
+	report_prefix_push("selftest");
+
+	if (!argc)
+		report_abort("no test specified");
+
+	report_prefix_push(argv[0]);
+
+	if (strcmp(argv[0], "setup") == 0) {
+
+		check_setup(argc-1, &argv[1]);
+
+	}
+
+	return report_summary();
 }
-- 
2.4.3