[PATCHv3 5/9] dspbridge: add mmufault support

From: Fernando Guzman Lugo
Date: Wed Jun 30 2010 - 19:51:43 EST

With changes for iommu migration mmu fault report and dsp track
dump is broken, this patch fixes that.

Signed-off-by: Fernando Guzman Lugo <x0095840@xxxxxx>
---
drivers/dsp/bridge/core/mmu_fault.c | 93 ++++++---------------------------
drivers/dsp/bridge/core/mmu_fault.h | 5 +-
drivers/dsp/bridge/core/tiomap3430.c | 2 +
drivers/dsp/bridge/core/ue_deh.c | 31 +++++-------
4 files changed, 34 insertions(+), 97 deletions(-)

diff --git a/drivers/dsp/bridge/core/mmu_fault.c b/drivers/dsp/bridge/core/mmu_fault.c
index 5c0124f..d991c6a 100644
--- a/drivers/dsp/bridge/core/mmu_fault.c
+++ b/drivers/dsp/bridge/core/mmu_fault.c
@@ -23,9 +23,12 @@
/* ----------------------------------- Trace & Debug */
#include <dspbridge/host_os.h>
#include <dspbridge/dbc.h>
+#include <plat/iommu.h>

/* ----------------------------------- OS Adaptation Layer */
#include <dspbridge/drv.h>
+#include <dspbridge/dev.h>
+

/* ----------------------------------- Link Driver */
#include <dspbridge/dspdeh.h>
@@ -40,11 +43,6 @@
#include "_tiomap.h"
#include "mmu_fault.h"

-static u32 dmmu_event_mask;
-u32 fault_addr;
-
-static bool mmu_check_if_fault(struct bridge_dev_context *dev_context);
-
/*
* ======== mmu_fault_dpc ========
* Deferred procedure call to handle DSP MMU fault.
@@ -62,78 +60,21 @@ void mmu_fault_dpc(IN unsigned long pRefData)
* ======== mmu_fault_isr ========
* ISR to be triggered by a DSP MMU fault interrupt.
*/
-irqreturn_t mmu_fault_isr(int irq, IN void *pRefData)
-{
- struct deh_mgr *deh_mgr_obj = (struct deh_mgr *)pRefData;
- struct bridge_dev_context *dev_context;
- struct cfg_hostres *resources;
-
- DBC_REQUIRE(irq == INT_DSP_MMU_IRQ);
- DBC_REQUIRE(deh_mgr_obj);
-
- if (deh_mgr_obj) {
-
- dev_context =
- (struct bridge_dev_context *)deh_mgr_obj->hbridge_context;
-
- resources = dev_context->resources;
-
- if (!resources) {
- dev_dbg(bridge, "%s: Failed to get Host Resources\n",
- __func__);
- return IRQ_HANDLED;
- }
- if (mmu_check_if_fault(dev_context)) {
- printk(KERN_INFO "***** DSPMMU FAULT ***** IRQStatus "
- "0x%x\n", dmmu_event_mask);
- printk(KERN_INFO "***** DSPMMU FAULT ***** fault_addr "
- "0x%x\n", fault_addr);
- /*
- * Schedule a DPC directly. In the future, it may be
- * necessary to check if DSP MMU fault is intended for
- * Bridge.
- */
- tasklet_schedule(&deh_mgr_obj->dpc_tasklet);
-
- /* Reset err_info structure before use. */
- deh_mgr_obj->err_info.dw_err_mask = DSP_MMUFAULT;
- deh_mgr_obj->err_info.dw_val1 = fault_addr >> 16;
- deh_mgr_obj->err_info.dw_val2 = fault_addr & 0xFFFF;
- deh_mgr_obj->err_info.dw_val3 = 0L;
- /* Disable the MMU events, else once we clear it will
- * start to raise INTs again */
- hw_mmu_event_disable(resources->dw_dmmu_base,
- HW_MMU_TRANSLATION_FAULT);
- } else {
- hw_mmu_event_disable(resources->dw_dmmu_base,
- HW_MMU_ALL_INTERRUPTS);
- }
- }
- return IRQ_HANDLED;
-}
+int mmu_fault_isr(struct iommu *mmu)

-/*
- * ======== mmu_check_if_fault ========
- * Check to see if MMU Fault is valid TLB miss from DSP
- * Note: This function is called from an ISR
- */
-static bool mmu_check_if_fault(struct bridge_dev_context *dev_context)
{
+ struct deh_mgr *dm;
+ u32 da;
+
+ dev_get_deh_mgr(dev_get_first(), &dm);
+
+ if (!dm)
+ return -EPERM;
+
+ da = iommu_read_reg(mmu, MMU_FAULT_AD);
+ iommu_write_reg(mmu, 0, MMU_IRQENABLE);
+ dm->err_info.dw_val1 = da;
+ tasklet_schedule(&dm->dpc_tasklet);

- bool ret = false;
- hw_status hw_status_obj;
- struct cfg_hostres *resources = dev_context->resources;
-
- if (!resources) {
- dev_dbg(bridge, "%s: Failed to get Host Resources in\n",
- __func__);
- return ret;
- }
- hw_status_obj =
- hw_mmu_event_status(resources->dw_dmmu_base, &dmmu_event_mask);
- if (dmmu_event_mask == HW_MMU_TRANSLATION_FAULT) {
- hw_mmu_fault_addr_read(resources->dw_dmmu_base, &fault_addr);
- ret = true;
- }
- return ret;
+ return 0;
}
diff --git a/drivers/dsp/bridge/core/mmu_fault.h b/drivers/dsp/bridge/core/mmu_fault.h
index 74db489..df3fba6 100644
--- a/drivers/dsp/bridge/core/mmu_fault.h
+++ b/drivers/dsp/bridge/core/mmu_fault.h
@@ -19,8 +19,6 @@
#ifndef MMU_FAULT_
#define MMU_FAULT_

-extern u32 fault_addr;
-
/*
* ======== mmu_fault_dpc ========
* Deferred procedure call to handle DSP MMU fault.
@@ -31,6 +29,7 @@ void mmu_fault_dpc(IN unsigned long pRefData);
* ======== mmu_fault_isr ========
* ISR to be triggered by a DSP MMU fault interrupt.
*/
-irqreturn_t mmu_fault_isr(int irq, IN void *pRefData);
+int mmu_fault_isr(struct iommu *mmu);
+

#endif /* MMU_FAULT_ */
diff --git a/drivers/dsp/bridge/core/tiomap3430.c b/drivers/dsp/bridge/core/tiomap3430.c
index 96cceea..89867e7 100644
--- a/drivers/dsp/bridge/core/tiomap3430.c
+++ b/drivers/dsp/bridge/core/tiomap3430.c
@@ -57,6 +57,7 @@
#include "_tiomap.h"
#include "_tiomap_pwr.h"
#include "tiomap_io.h"
+#include "mmu_fault.h"

/* Offset in shared mem to write to in order to synchronize start with DSP */
#define SHMSYNCOFFSET 4 /* GPP byte offset */
@@ -382,6 +383,7 @@ static int bridge_brd_start(struct bridge_dev_context *hDevContext,
goto end;
}
dev_context->dsp_mmu = mmu;
+ mmu->isr = mmu_fault_isr;
sm_sg = dev_context->sh_s;

sm_sg->seg0_da = iommu_kmap(mmu, sm_sg->seg0_da, sm_sg->seg0_pa,
diff --git a/drivers/dsp/bridge/core/ue_deh.c b/drivers/dsp/bridge/core/ue_deh.c
index ce13e6c..a03d172 100644
--- a/drivers/dsp/bridge/core/ue_deh.c
+++ b/drivers/dsp/bridge/core/ue_deh.c
@@ -18,6 +18,7 @@

/* ----------------------------------- Host OS */
#include <dspbridge/host_os.h>
+#include <plat/iommu.h>

/* ----------------------------------- DSP/BIOS Bridge */
#include <dspbridge/std.h>
@@ -51,12 +52,6 @@
#include "_tiomap_pwr.h"
#include <dspbridge/io_sm.h>

-
-static struct hw_mmu_map_attrs_t map_attrs = { HW_LITTLE_ENDIAN,
- HW_ELEM_SIZE16BIT,
- HW_MMU_CPUES
-};
-
static void *dummy_va_addr;

int bridge_deh_create(struct deh_mgr **ret_deh_mgr,
@@ -154,10 +149,10 @@ int bridge_deh_register_notify(struct deh_mgr *deh_mgr, u32 event_mask,
void bridge_deh_notify(struct deh_mgr *deh_mgr, u32 ulEventMask, u32 dwErrInfo)
{
struct bridge_dev_context *dev_context;
- int status = 0;
u32 hw_mmu_max_tlb_count = 31;
struct cfg_hostres *resources;
- hw_status hw_status_obj;
+ u32 fault_addr, tmp;
+ struct iotlb_entry e;

if (!deh_mgr)
return;
@@ -181,6 +176,9 @@ void bridge_deh_notify(struct deh_mgr *deh_mgr, u32 ulEventMask, u32 dwErrInfo)
break;
case DSP_MMUFAULT:
/* MMU fault routine should have set err info structure. */
+ fault_addr = iommu_read_reg(dev_context->dsp_mmu,
+ MMU_FAULT_AD);
+
deh_mgr->err_info.dw_err_mask = DSP_MMUFAULT;
dev_err(bridge, "%s: %s, err_info = 0x%x\n",
__func__, "DSP_MMUFAULT", dwErrInfo);
@@ -206,21 +204,18 @@ void bridge_deh_notify(struct deh_mgr *deh_mgr, u32 ulEventMask, u32 dwErrInfo)
dev_context->num_tlb_entries =
dev_context->fixed_tlb_entries;
}
- if (DSP_SUCCEEDED(status)) {
- hw_status_obj =
- hw_mmu_tlb_add(resources->dw_dmmu_base,
- virt_to_phys(dummy_va_addr), fault_addr,
- HW_PAGE_SIZE4KB, 1,
- &map_attrs, HW_SET, HW_SET);
- }
+ dsp_iotlb_init(&e, fault_addr & PAGE_MASK,
+ virt_to_phys(dummy_va_addr), IOVMF_PGSZ_4K);
+ load_iotlb_entry(dev_context->dsp_mmu, &e);
+

dsp_clk_enable(DSP_CLK_GPT8);

dsp_gpt_wait_overflow(DSP_CLK_GPT8, 0xfffffffe);

- /* Clear MMU interrupt */
- hw_mmu_event_ack(resources->dw_dmmu_base,
- HW_MMU_TRANSLATION_FAULT);
+ tmp = iommu_read_reg(dev_context->dsp_mmu, MMU_IRQSTATUS);
+ iommu_write_reg(dev_context->dsp_mmu, tmp, MMU_IRQSTATUS);
+
dump_dsp_stack(deh_mgr->hbridge_context);
dsp_clk_disable(DSP_CLK_GPT8);
break;
--
1.7.0.4

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