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Date: Mon, 1 Apr 2013 08:47:33 -0500
From: Suravee Suthikulanit <suravee.suthikulpanit@....com>
To: Jörg Rödel <joro@...tes.org>
CC: <iommu@...ts.linux-foundation.org>,
<suravee.suthikulpanit@....com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] iommu/amd: Add logic to decode AMD IOMMU event flag
Hi Joerg,
Do you have any comments or feedback about this patch set?
Thank you,
Suravee
On 3/27/2013 6:51 PM, suravee.suthikulpanit@....com wrote:
> From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
>
> Add logic to decode AMD IOMMU event flag based on information from AMD IOMMU specification.
> This should simplify debugging IOMMU errors. Also, dump DTE information in additional cases.
>
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> ---
> drivers/iommu/amd_iommu.c | 161 +++++++++++++++++++++++++++++++++++++--------
> 1 file changed, 134 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
> index 98f555d..477cfbb 100644
> --- a/drivers/iommu/amd_iommu.c
> +++ b/drivers/iommu/amd_iommu.c
> @@ -592,7 +592,6 @@ static void amd_iommu_stats_init(void)
> amd_iommu_stats_add(&invalidate_iotlb_all);
> amd_iommu_stats_add(&pri_requests);
> }
> -
> #endif
>
> /****************************************************************************
> @@ -601,6 +600,99 @@ static void amd_iommu_stats_init(void)
> *
> ****************************************************************************/
>
> +struct _event_log_flags {
> + u32 gn:1, /* 16 */
> + nx:1, /* 17 */
> + us:1, /* 18 */
> + i:1, /* 19 */
> + pr:1, /* 20 */
> + rw:1, /* 21 */
> + pe:1, /* 22 */
> + rz:1, /* 23 */
> + tr:1, /* 24 */
> + type:3, /* [27:25] */
> + _reserved_:20; /* Reserved */
> +};
> +
> +static const char * const _invalid_transaction_desc[] = {
> + /* 000 */"Read request or non-posted write in the interrupt "
> + "addres range",
> + /* 001 */"Pretranslated transaction received from an I/O device "
> + "that has I=0 or V=0 in DTE",
> + /* 010 */"Port I/O space transaction received from an I/O device "
> + "that has IoCtl=00b in DTE",
> + /* 011 */"Posted write to invalid address range",
> + /* 100 */"Invalid read request or non-posted write",
> + /* 101 */"Posted write to the interrupt/EOI range from an I/O "
> + "device that has IntCtl=00b in DTE",
> + /* 110 */"Posted write to a reserved interrupt address range",
> + /* 111 */"Invalid transaction to the system management address range",
> +};
> +
> +static const char * const _invalid_translation_desc[] = {
> + /* 000 */"Translation request received from an I/O device that has "
> + "I=0, or has V=0, or has V=1 and TV=0 in DTE",
> + /* 001 */"Translation request in invalid address range",
> + /* 010 */"Invalid translation request",
> + /* 011 */"Reserved",
> + /* 100 */"Reserved",
> + /* 101 */"Reserved",
> + /* 110 */"Reserved",
> + /* 111 */"Reserved",
> +};
> +
> +static void dump_flags(int flags, int ev_type)
> +{
> + struct _event_log_flags *p = (struct _event_log_flags *) &flags;
> + u32 err_type = p->type;
> +
> + pr_err("AMD-Vi: Flags details:\n");
> + pr_err("AMD-Vi: Guest / Nested : %u\n", p->gn);
> + pr_err("AMD-Vi: No Execute : %u\n", p->nx);
> + pr_err("AMD-Vi: User-Supervisor : %u\n", p->us);
> + pr_err("AMD-Vi: Interrupt : %u\n", p->i);
> + pr_err("AMD-Vi: Present : %u\n", p->pr);
> + pr_err("AMD-Vi: Read / Write : %u\n", p->rw);
> + pr_err("AMD-Vi: Permission : %u\n", p->pe);
> + pr_err("AMD-Vi: Reserv bit not zero / Illegal level encoding : %u\n",
> + p->rz);
> + pr_err("AMD-Vi: Translation / Transaction : %u\n",
> + p->tr);
> + pr_err("AMD-Vi: Type of error : (0x%x) ", err_type);
> +
> + if ((ev_type == EVENT_TYPE_DEV_TAB_ERR) ||
> + (ev_type == EVENT_TYPE_PAGE_TAB_ERR) ||
> + (ev_type == EVENT_TYPE_CMD_HARD_ERR)) {
> + /* Only supports up to 2 bits */
> + err_type &= 0x3;
> + switch (err_type) {
> + case 0:
> + pr_err("Reserved\n");
> + break;
> + case 1:
> + pr_err("Master Abort\n");
> + break;
> + case 2:
> + pr_err("Target Abort\n");
> + break;
> + case 3:
> + pr_err("Data Error\n");
> + break;
> + }
> + } else if (ev_type == EVENT_TYPE_INV_DEV_REQ) {
> + if (p->tr == 0) {
> + if (err_type < ARRAY_SIZE(_invalid_translation_desc))
> + printk("%s\n",
> + _invalid_translation_desc[err_type]);
> + } else {
> + if (err_type < ARRAY_SIZE(_invalid_transaction_desc))
> + printk("%s\n",
> + _invalid_transaction_desc[err_type]);
> + }
> + }
> + pr_err("AMD-Vi: (Note: Please refer to AMD IOMMU specification for details.)\n");
> +}
> +
> static void dump_dte_entry(u16 devid)
> {
> int i;
> @@ -619,31 +711,10 @@ static void dump_command(unsigned long phys_addr)
> pr_err("AMD-Vi: CMD[%d]: %08x\n", i, cmd->data[i]);
> }
>
> -static void iommu_print_event(struct amd_iommu *iommu, void *__evt)
> +static void iommu_print_event(int type, int devid, int domid,
> + int flags, u64 address)
> {
> - int type, devid, domid, flags;
> - volatile u32 *event = __evt;
> - int count = 0;
> - u64 address;
> -
> -retry:
> - type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK;
> - devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK;
> - domid = (event[1] >> EVENT_DOMID_SHIFT) & EVENT_DOMID_MASK;
> - flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK;
> - address = (u64)(((u64)event[3]) << 32) | event[2];
> -
> - if (type == 0) {
> - /* Did we hit the erratum? */
> - if (++count == LOOP_TIMEOUT) {
> - pr_err("AMD-Vi: No event written to event log\n");
> - return;
> - }
> - udelay(1);
> - goto retry;
> - }
> -
> - printk(KERN_ERR "AMD-Vi: Event logged [");
> + pr_err("AMD-Vi: Event logged [");
>
> switch (type) {
> case EVENT_TYPE_ILL_DEV:
> @@ -651,6 +722,7 @@ retry:
> "address=0x%016llx flags=0x%04x]\n",
> PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
> address, flags);
> + dump_flags(flags, type);
> dump_dte_entry(devid);
> break;
> case EVENT_TYPE_IO_FAULT:
> @@ -658,18 +730,22 @@ retry:
> "domain=0x%04x address=0x%016llx flags=0x%04x]\n",
> PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
> domid, address, flags);
> + dump_flags(flags, type);
> + dump_dte_entry(devid);
> break;
> case EVENT_TYPE_DEV_TAB_ERR:
> printk("DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x "
> "address=0x%016llx flags=0x%04x]\n",
> PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
> address, flags);
> + dump_flags(flags, type);
> break;
> case EVENT_TYPE_PAGE_TAB_ERR:
> printk("PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x "
> "domain=0x%04x address=0x%016llx flags=0x%04x]\n",
> PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
> domid, address, flags);
> + dump_flags(flags, type);
> break;
> case EVENT_TYPE_ILL_CMD:
> printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address);
> @@ -678,6 +754,7 @@ retry:
> case EVENT_TYPE_CMD_HARD_ERR:
> printk("COMMAND_HARDWARE_ERROR address=0x%016llx "
> "flags=0x%04x]\n", address, flags);
> + dump_flags(flags, type);
> break;
> case EVENT_TYPE_IOTLB_INV_TO:
> printk("IOTLB_INV_TIMEOUT device=%02x:%02x.%x "
> @@ -690,11 +767,40 @@ retry:
> "address=0x%016llx flags=0x%04x]\n",
> PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
> address, flags);
> + dump_flags(flags, type);
> + dump_dte_entry(devid);
> break;
> default:
> - printk(KERN_ERR "UNKNOWN type=0x%02x]\n", type);
> + printk("UNKNOWN type=0x%02x]\n", type);
> + }
> +}
> +
> +static void iommu_handle_event(struct amd_iommu *iommu, void *__evt)
> +{
> + int type, devid, domid, flags;
> + u32 *event = __evt;
> + int count = 0;
> + u64 address;
> +
> +retry:
> + type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK;
> + devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK;
> + domid = (event[1] >> EVENT_DOMID_SHIFT) & EVENT_DOMID_MASK;
> + flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK;
> + address = (u64)(((u64)event[3]) << 32) | event[2];
> +
> + if (type == 0) {
> + /* Did we hit the erratum? */
> + if (++count == LOOP_TIMEOUT) {
> + pr_err("AMD-Vi: No event written to event log\n");
> + return;
> + }
> + udelay(1);
> + goto retry;
> }
>
> + iommu_print_event(type, devid, domid, flags, address);
> +
> memset(__evt, 0, 4 * sizeof(u32));
> }
>
> @@ -709,7 +815,7 @@ static void iommu_poll_events(struct amd_iommu *iommu)
> tail = readl(iommu->mmio_base + MMIO_EVT_TAIL_OFFSET);
>
> while (head != tail) {
> - iommu_print_event(iommu, iommu->evt_buf + head);
> + iommu_handle_event(iommu, iommu->evt_buf + head);
> head = (head + EVENT_ENTRY_SIZE) % iommu->evt_buf_size;
> }
>
> @@ -3270,6 +3376,7 @@ static int __init alloc_passthrough_domain(void)
>
> return 0;
> }
> +
> static int amd_iommu_domain_init(struct iommu_domain *dom)
> {
> struct protection_domain *domain;
--
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