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Date: Tue, 08 Apr 2014 12:54:47 -0700
From: Stephen Boyd <sboyd@...eaurora.org>
To: Borislav Petkov <bp@...en8.de>
CC: linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-edac@...r.kernel.org,
Stepan Moskovchenko <stepanm@...eaurora.org>
Subject: Re: [PATCH v6 4/5] edac: Add support for Krait CPU cache error detection
On 04/08/14 10:35, Borislav Petkov wrote:
> On Fri, Apr 04, 2014 at 12:57:29PM -0700, Stephen Boyd wrote:
>> +
>> +struct krait_edac_error {
>> + const char * const msg;
>> + void (*func)(struct edac_device_ctl_info *edac_dev,
>> + int inst_nr, int block_nr, const char *msg);
> arg alignment (please start new line at the opening brace).
Done.
>> + int print_regs = cesr & CESR_PRINT_MASK;
>> + int i;
>> + static const struct krait_edac_error errors[] = {
>> + { "D-cache tag parity error", edac_device_handle_ue },
>> + { "D-cache data parity error", edac_device_handle_ue },
>> + { "I-cache tag parity error", edac_device_handle_ce },
>> + { "I-cache data parity error", edac_device_handle_ce },
>> + { "D-cache tag timing error", edac_device_handle_ue },
>> + { "D-cache data timing error", edac_device_handle_ue },
>> + { "I-cache tag timing error", edac_device_handle_ce },
>> + { "I-cache data timing error", edac_device_handle_ce }
>> + };
>> +
>> + if (print_regs) {
> This variable is used only once here, you can simply do the binary and
> test then and drop it:
>
> if (cesr & CESR_PRINT_MASK)
Done.
>
>> + pr_alert("L1 / TLB Error detected on CPU %d!\n", cpu);
>> + pr_alert("CESR = 0x%08x\n", cesr);
> You can use the edac_*_printk with KERN_ALERT as level which adds proper
> prefixes.
Done.
>
>
>> +
>> + if (cesr & CESR_TLBMH) {
>> + asm ("mcr p15, 0, r0, c8, c7, 0");
>> + edac_device_handle_ce(edac, cpu, 0, "TLB Multi-Hit error");
>> + }
>> +
>> + if (cesr & (CESR_ICTPE | CESR_ICDPE | CESR_ICTE)) {
>> + i_cesynr = read_cesynr();
>> + pr_alert("I-side CESYNR = 0x%08x\n", i_cesynr);
> edac_printk
>
> and also, this message looks a bit cryptic for issuing it at ALERT
> level. I'm ssuming people won't come to you and ask you what it
> means...? :)
Ok. I can lower it to error level?
>
>> + write_cesr(CESR_I_MASK);
>> +
>> + /*
>> + * Clear the I-side bits from the captured CESR value so that we
>> + * don't accidentally clear any new I-side errors when we do
>> + * the CESR write-clear operation.
>> + */
>> + cesr &= ~CESR_I_MASK;
>> + }
>> +
>> + if (cesr & (CESR_DCTPE | CESR_DCDPE | CESR_DCTE)) {
>> + d_cesynr = read_cesynr();
>> + pr_alert("D-side CESYNR = 0x%08x\n", d_cesynr);
> Ditto.
>
>> + }
>> +
>> + /* Clear the interrupt bits we processed */
>> + write_cesr(cesr);
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static irqreturn_t krait_l2_irq(int irq, void *dev_id)
>> +{
>> + struct edac_device_ctl_info *edac = dev_id;
>> + unsigned int l2esr;
>> + unsigned int l2esynr0;
>> + unsigned int l2esynr1;
>> + unsigned int l2ear0;
>> + unsigned int l2ear1;
>> + unsigned long cpu;
>> + int i;
>> + static const struct krait_edac_error errors[] = {
>> + { "master port decode error", edac_device_handle_ce },
>> + { "master port slave error", edac_device_handle_ce },
>> + { "tag soft error, single-bit", edac_device_handle_ce },
>> + { "tag soft error, double-bit", edac_device_handle_ue },
>> + { "data soft error, single-bit", edac_device_handle_ce },
>> + { "data soft error, double-bit", edac_device_handle_ue },
>> + { "modified soft error", edac_device_handle_ce },
>> + { "slave port exclusive monitor not available",
>> + edac_device_handle_ue},
>> + { "master port LDREX received Normal OK response",
>> + edac_device_handle_ce },
>> + };
>> +
>> + l2esr = krait_get_l2_indirect_reg(L2ESR);
>> + pr_alert("Error detected!\n");
> Why print this not very telling message here if errors[i].func() will
> get the proper .msg later?
Sure I can drop it.
>
>> + pr_alert("L2ESR = 0x%08x\n", l2esr);
>> +
>> + if (l2esr & (L2ESR_TSESB | L2ESR_TSEDB | L2ESR_MSE | L2ESR_SP)) {
>> + l2esynr0 = krait_get_l2_indirect_reg(L2ESYNR0);
>> + l2esynr1 = krait_get_l2_indirect_reg(L2ESYNR1);
>> + l2ear0 = krait_get_l2_indirect_reg(L2EAR0);
>> + l2ear1 = krait_get_l2_indirect_reg(L2EAR1);
>> +
>> + pr_alert("L2ESYNR0 = 0x%08x\n", l2esynr0);
>> + pr_alert("L2ESYNR1 = 0x%08x\n", l2esynr1);
>> + pr_alert("L2EAR0 = 0x%08x\n", l2ear0);
>> + pr_alert("L2EAR1 = 0x%08x\n", l2ear1);
> Also, please use edac_printk and consider making those messages
> human-readable, otherwise it only confuses users.
Ok.
--
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