Re: regression: OMAP4 (next-20141204) (bisect to: ARM: 8208/1: l2c: Refactor the driver to use commit-like)

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Hello,

On 2014-12-09 17:57, Nishanth Menon wrote:
On 10:13-20141205, Nishanth Menon wrote:
On 12/05/2014 10:10 AM, Nishanth Menon wrote:
next-20141204 fails to boot, but next-20141203 boots fine with
omap2plus_defconfig.

Panda-ES(4460):
https://github.com/nmenon/kernel-test-logs/blob/next-20141204/omap2plus_defconfig/pandaboard-es.txt
Panda(4430):
https://github.com/nmenon/kernel-test-logs/blob/next-20141204/omap2plus_defconfig/pandaboard-vanilla.txt

at the point of hang (JTAG):
  pandaboard-es:
	cpu0: http://slexy.org/view/s2eIFqkRd5
	cpu1: http://slexy.org/view/s2Tysb6gpL

Case #1:
Disabling CPUIDLE allows boot to proceed. there does not seem to have
been any change in drivers/cpuidle and arch/arm/mach-omap2 w.r.t this.

Case #2: Reverting the following allows boot.

 From next-20141204
10df7d5 ARM: 8211/1: l2c: Add support for overriding prefetch settings
revert this  -> boot still fails

d42ced0 ARM: 8210/1: l2c: Get outer cache .write_sec callback from
mach_desc only if not NULL
revert this  -> boot still fails

46b9af8 ARM: 8209/1: l2c: Add interface to ask hypervisor to configure L2C
revert this  -> boot still fails

c94e325 ARM: 8208/1: l2c: Refactor the driver to use commit-like
revert this  -> boot passed (first bad commit).


+ linux-samsung soc and updated Thomaz's mail ID (gmail now).
Spend a few mins trying to track this down and it does look like commit
c94e325 does a kmemdup for the data as part of l2x0_of_init->__l2c_init

This fails since the invocation is in early_init. doing it a bit later
as the following hack makes it work
diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c
index 608079a..0bc6bd9 100644
--- a/arch/arm/mach-omap2/board-generic.c
+++ b/arch/arm/mach-omap2/board-generic.c
@@ -170,12 +170,19 @@ static const char *const omap4_boards_compat[] __initconst = {
  	NULL,
  };
+
+static void tmp_init_irq(void)
+{
+	omap_l2_cache_init();
+	omap_gic_of_init();
+}
+
  DT_MACHINE_START(OMAP4_DT, "Generic OMAP4 (Flattened Device Tree)")
  	.reserve	= omap_reserve,
  	.smp		= smp_ops(omap4_smp_ops),
  	.map_io		= omap4_map_io,
  	.init_early	= omap4430_init_early,
-	.init_irq	= omap_gic_of_init,
+	.init_irq	= tmp_init_irq,
  	.init_machine	= omap_generic_init,
  	.init_late	= omap4430_init_late,
  	.init_time	= omap4_local_timer_init,
diff --git a/arch/arm/mach-omap2/io.c b/arch/arm/mach-omap2/io.c
index 03cbb16..f97847d 100644
--- a/arch/arm/mach-omap2/io.c
+++ b/arch/arm/mach-omap2/io.c
@@ -627,7 +627,6 @@ void __init omap4430_init_early(void)
  	omap44xx_clockdomains_init();
  	omap44xx_hwmod_init();
  	omap_hwmod_init_postsetup();
-	omap_l2_cache_init();
  	omap_clk_soc_init = omap4xxx_dt_clk_init;
  }

Please note that am43xx_init_early() also calls omap_l2_cache_init(),
so similar fix is needed for "Generic AM43 (Flattened Device Tree)"
machines.

I've briefly looked how the initialization is done on various omap
platforms, but I don't see the good generic place for omap_l2_cache_init().
IMHO the best solution will be to completely switch to generic/common l2c
initialization and provide ".l2c_aux_val" and ".l2c_aux_mask" in machine
descriptor. For the time being something like proposed above can be used.

I assume that now it won't be possible to get l2c patches back to -next,
so I will resend them (again...) with the omap related fix.

diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index e5948c5..0ca90db 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -848,8 +848,11 @@ static int __init __l2c_init(const struct l2c_init_data *data,
  	 * context from callers can access the structure.
  	 */
  	l2x0_data = kmemdup(data, sizeof(*data), GFP_KERNEL);
-	if (!l2x0_data)
+	if (!l2x0_data) {
+		pr_err("%s no mem %d\n", __func__, sizeof(*data));
+		dump_stack();
  		return -ENOMEM;
+	}
/*
  	 * Sanity check the aux values.  aux_mask is the bits we preserve
@@ -1647,6 +1650,7 @@ int __init l2x0_of_init(u32 aux_val, u32 aux_mask)
  	struct device_node *np;
  	struct resource res;
  	u32 cache_id, old_aux;
+	int r;
np = of_find_matching_node(NULL, l2x0_ids);
  	if (!np)
@@ -1693,6 +1697,8 @@ int __init l2x0_of_init(u32 aux_val, u32 aux_mask)
  	else
  		cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
- return __l2c_init(data, aux_val, aux_mask, cache_id);
+	r = __l2c_init(data, aux_val, aux_mask, cache_id);
+	pr_err("%s: %d\n", __func__, r);
+	return r;
  }


Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland

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