/*
* kgsl_iommu_default_setstate - Change the IOMMU pagetable or flush IOMMU tlb
* of the primary context bank
* @mmu - Pointer to mmu structure
* @flags - Flags indicating whether pagetable has to chnage or tlb is to be
* flushed or both
*
* Based on flags set the new pagetable fo the IOMMU unit or flush it's tlb or
* do both by doing direct register writes to the IOMMu registers through the
* cpu
* Return - void
*/
static void kgsl_iommu_default_setstate(struct kgsl_mmu *mmu,
uint32_t flags)
{
struct kgsl_iommu *iommu = mmu->priv;
int temp;
int i;
unsigned int pt_base = kgsl_iommu_get_pt_base_addr(mmu,
mmu->hwpagetable);
unsigned int pt_val;
if (kgsl_iommu_enable_clk(mmu, KGSL_IOMMU_CONTEXT_USER)) {
KGSL_DRV_ERR(mmu->device, "Failed to enable iommu clocks\n");
return;
}
/* Mask off the lsb of the pt base address since lsb will not change */
pt_base &= (iommu->iommu_reg_list[KGSL_IOMMU_CTX_TTBR0].reg_mask <<
iommu->iommu_reg_list[KGSL_IOMMU_CTX_TTBR0].reg_shift);
/* For v1 SMMU GPU needs to be idle for tlb invalidate as well */
if (msm_soc_version_supports_iommu_v1())
kgsl_idle(mmu->device);
/* Acquire GPU-CPU sync Lock here */
msm_iommu_lock();
if (flags & KGSL_MMUFLAGS_PTUPDATE) {
if (!msm_soc_version_supports_iommu_v1())
kgsl_idle(mmu->device);
for (i = 0; i < iommu->unit_count; i++) {
/* get the lsb value which should not change when
* changing ttbr0 */
pt_val = kgsl_iommu_get_pt_lsb(mmu, i,
KGSL_IOMMU_CONTEXT_USER);
pt_val += pt_base;
KGSL_IOMMU_SET_CTX_REG(iommu, (&iommu->iommu_units[i]),
KGSL_IOMMU_CONTEXT_USER, TTBR0, pt_val);
mb();
temp = KGSL_IOMMU_GET_CTX_REG(iommu,
(&iommu->iommu_units[i]),
KGSL_IOMMU_CONTEXT_USER, TTBR0);
}
}
/* Flush tlb */
if (flags & KGSL_MMUFLAGS_TLBFLUSH) {
for (i = 0; i < iommu->unit_count; i++) {
KGSL_IOMMU_SET_CTX_REG(iommu, (&iommu->iommu_units[i]),
KGSL_IOMMU_CONTEXT_USER, TLBIALL, 1);
mb();
}
}
/* Release GPU-CPU sync Lock here */
msm_iommu_unlock();
/* Disable smmu clock */
kgsl_iommu_disable_clk_on_ts(mmu, 0, false);
}
static int kgsl_iommu_fault_handler(struct iommu_domain *domain,
struct device *dev, unsigned long addr, int flags)
{
int ret = 0;
struct kgsl_mmu *mmu;
struct kgsl_iommu *iommu;
struct kgsl_iommu_unit *iommu_unit;
struct kgsl_iommu_device *iommu_dev;
unsigned int ptbase, fsr;
ret = get_iommu_unit(dev, &mmu, &iommu_unit);
if (ret)
goto done;
iommu_dev = get_iommu_device(iommu_unit, dev);
if (!iommu_dev) {
KGSL_CORE_ERR("Invalid IOMMU device %p\n", dev);
ret = -ENOSYS;
goto done;
}
iommu = mmu->priv;
ptbase = KGSL_IOMMU_GET_CTX_REG(iommu, iommu_unit,
iommu_dev->ctx_id, TTBR0);
fsr = KGSL_IOMMU_GET_CTX_REG(iommu, iommu_unit,
iommu_dev->ctx_id, FSR);
KGSL_MEM_CRIT(iommu_dev->kgsldev,
"GPU PAGE FAULT: addr = %lX pid = %d\n",
addr, kgsl_mmu_get_ptname_from_ptbase(mmu, ptbase));
KGSL_MEM_CRIT(iommu_dev->kgsldev, "context = %d FSR = %X\n",
iommu_dev->ctx_id, fsr);
trace_kgsl_mmu_pagefault(iommu_dev->kgsldev, addr,
kgsl_mmu_get_ptname_from_ptbase(mmu, ptbase), 0);
done:
return ret;
}
static unsigned int
kgsl_iommu_get_current_ptbase(struct kgsl_mmu *mmu)
{
unsigned int pt_base;
struct kgsl_iommu *iommu = mmu->priv;
/* We cannot enable or disable the clocks in interrupt context, this
function is called from interrupt context if there is an axi error */
if (in_interrupt())
return 0;
/* Return the current pt base by reading IOMMU pt_base register */
kgsl_iommu_enable_clk(mmu, KGSL_IOMMU_CONTEXT_USER);
pt_base = KGSL_IOMMU_GET_CTX_REG(iommu, (&iommu->iommu_units[0]),
KGSL_IOMMU_CONTEXT_USER,
TTBR0);
kgsl_iommu_disable_clk_on_ts(mmu, 0, false);
return pt_base &
(iommu->iommu_reg_list[KGSL_IOMMU_CTX_TTBR0].reg_mask <<
iommu->iommu_reg_list[KGSL_IOMMU_CTX_TTBR0].reg_shift);
}
static int kgsl_iommu_start(struct kgsl_mmu *mmu)
{
struct kgsl_device *device = mmu->device;
int status;
struct kgsl_iommu *iommu = mmu->priv;
int i, j;
if (mmu->flags & KGSL_FLAGS_STARTED)
return 0;
if (mmu->defaultpagetable == NULL) {
status = kgsl_iommu_setup_defaultpagetable(mmu);
if (status)
return -ENOMEM;
/* Initialize the sync lock between GPU and CPU */
if (msm_soc_version_supports_iommu_v1() &&
(device->id == KGSL_DEVICE_3D0))
kgsl_iommu_init_sync_lock(mmu);
}
/* We use the GPU MMU to control access to IOMMU registers on 8960 with
* a225, hence we still keep the MMU active on 8960 */
if (cpu_is_msm8960()) {
struct kgsl_mh *mh = &(mmu->device->mh);
kgsl_regwrite(mmu->device, MH_MMU_CONFIG, 0x00000001);
kgsl_regwrite(mmu->device, MH_MMU_MPU_END,
mh->mpu_base +
iommu->iommu_units[0].reg_map.gpuaddr);
} else {
kgsl_regwrite(mmu->device, MH_MMU_CONFIG, 0x00000000);
}
mmu->hwpagetable = mmu->defaultpagetable;
status = kgsl_attach_pagetable_iommu_domain(mmu);
if (status) {
mmu->hwpagetable = NULL;
goto done;
}
status = kgsl_iommu_enable_clk(mmu, KGSL_IOMMU_CONTEXT_USER);
if (status) {
KGSL_CORE_ERR("clk enable failed\n");
goto done;
}
status = kgsl_iommu_enable_clk(mmu, KGSL_IOMMU_CONTEXT_PRIV);
if (status) {
KGSL_CORE_ERR("clk enable failed\n");
goto done;
}
/* Get the lsb value of pagetables set in the IOMMU ttbr0 register as
* that value should not change when we change pagetables, so while
* changing pagetables we can use this lsb value of the pagetable w/o
* having to read it again
*/
for (i = 0; i < iommu->unit_count; i++) {
struct kgsl_iommu_unit *iommu_unit = &iommu->iommu_units[i];
for (j = 0; j < iommu_unit->dev_count; j++)
iommu_unit->dev[j].pt_lsb = KGSL_IOMMMU_PT_LSB(iommu,
KGSL_IOMMU_GET_CTX_REG(iommu,
iommu_unit,
iommu_unit->dev[j].ctx_id,
TTBR0));
}
kgsl_iommu_disable_clk_on_ts(mmu, 0, false);
mmu->flags |= KGSL_FLAGS_STARTED;
done:
if (status) {
kgsl_iommu_disable_clk_on_ts(mmu, 0, false);
kgsl_detach_pagetable_iommu_domain(mmu);
}
return status;
}
static int kgsl_iommu_fault_handler(struct iommu_domain *domain,
struct device *dev, unsigned long addr, int flags)
{
int ret = 0;
struct kgsl_mmu *mmu;
struct kgsl_iommu *iommu;
struct kgsl_iommu_unit *iommu_unit;
struct kgsl_iommu_device *iommu_dev;
unsigned int ptbase, fsr;
struct kgsl_device *device;
struct adreno_device *adreno_dev;
unsigned int no_page_fault_log = 0;
unsigned int curr_context_id = 0;
unsigned int curr_global_ts = 0;
static struct adreno_context *curr_context;
static struct kgsl_context *context;
ret = get_iommu_unit(dev, &mmu, &iommu_unit);
if (ret)
goto done;
iommu_dev = get_iommu_device(iommu_unit, dev);
if (!iommu_dev) {
KGSL_CORE_ERR("Invalid IOMMU device %p\n", dev);
ret = -ENOSYS;
goto done;
}
iommu = mmu->priv;
device = mmu->device;
adreno_dev = ADRENO_DEVICE(device);
ptbase = KGSL_IOMMU_GET_CTX_REG(iommu, iommu_unit,
iommu_dev->ctx_id, TTBR0);
fsr = KGSL_IOMMU_GET_CTX_REG(iommu, iommu_unit,
iommu_dev->ctx_id, FSR);
if (adreno_dev->ft_pf_policy & KGSL_FT_PAGEFAULT_LOG_ONE_PER_PAGE)
no_page_fault_log = kgsl_mmu_log_fault_addr(mmu, ptbase, addr);
if (!no_page_fault_log) {
KGSL_MEM_CRIT(iommu_dev->kgsldev,
"GPU PAGE FAULT: addr = %lX pid = %d\n",
addr, kgsl_mmu_get_ptname_from_ptbase(mmu, ptbase));
KGSL_MEM_CRIT(iommu_dev->kgsldev, "context = %d FSR = %X\n",
iommu_dev->ctx_id, fsr);
}
mmu->fault = 1;
iommu_dev->fault = 1;
kgsl_sharedmem_readl(&device->memstore, &curr_context_id,
KGSL_MEMSTORE_OFFSET(KGSL_MEMSTORE_GLOBAL, current_context));
context = idr_find(&device->context_idr, curr_context_id);
if (context != NULL)
curr_context = context->devctxt;
kgsl_sharedmem_readl(&device->memstore, &curr_global_ts,
KGSL_MEMSTORE_OFFSET(KGSL_MEMSTORE_GLOBAL, eoptimestamp));
/*
* Store pagefault's timestamp and ib1 addr in context,
* this information is used in GFT
*/
curr_context->pagefault = 1;
curr_context->pagefault_ts = curr_global_ts;
trace_kgsl_mmu_pagefault(iommu_dev->kgsldev, addr,
kgsl_mmu_get_ptname_from_ptbase(mmu, ptbase), 0);
/*
* We do not want the h/w to resume fetching data from an iommu unit
* that has faulted, this is better for debugging as it will stall
* the GPU and trigger a snapshot. To stall the transaction return
* EBUSY error.
*/
if (adreno_dev->ft_pf_policy & KGSL_FT_PAGEFAULT_GPUHALT_ENABLE)
ret = -EBUSY;
done:
return ret;
}
