blob: 110ec952d7aa2a6b4178c2469cb4f0bfdd73b034 [file] [log] [blame]
/*
* Copyright (C) 2010-2013 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
*
* A copy of the licence is included with the program, and can also be obtained from Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "mali_kernel_common.h"
#include "mali_osk.h"
#include "mali_osk_bitops.h"
#include "mali_osk_list.h"
#include "mali_ukk.h"
#include "mali_mmu.h"
#include "mali_hw_core.h"
#include "mali_group.h"
#include "mali_mmu_page_directory.h"
/**
* Size of the MMU registers in bytes
*/
#define MALI_MMU_REGISTERS_SIZE 0x24
/**
* MMU commands
* These are the commands that can be sent
* to the MMU unit.
*/
typedef enum mali_mmu_command
{
MALI_MMU_COMMAND_ENABLE_PAGING = 0x00, /**< Enable paging (memory translation) */
MALI_MMU_COMMAND_DISABLE_PAGING = 0x01, /**< Disable paging (memory translation) */
MALI_MMU_COMMAND_ENABLE_STALL = 0x02, /**< Enable stall on page fault */
MALI_MMU_COMMAND_DISABLE_STALL = 0x03, /**< Disable stall on page fault */
MALI_MMU_COMMAND_ZAP_CACHE = 0x04, /**< Zap the entire page table cache */
MALI_MMU_COMMAND_PAGE_FAULT_DONE = 0x05, /**< Page fault processed */
MALI_MMU_COMMAND_HARD_RESET = 0x06 /**< Reset the MMU back to power-on settings */
} mali_mmu_command;
static void mali_mmu_probe_trigger(void *data);
static _mali_osk_errcode_t mali_mmu_probe_ack(void *data);
MALI_STATIC_INLINE _mali_osk_errcode_t mali_mmu_raw_reset(struct mali_mmu_core *mmu);
/* page fault queue flush helper pages
* note that the mapping pointers are currently unused outside of the initialization functions */
static u32 mali_page_fault_flush_page_directory = MALI_INVALID_PAGE;
static u32 mali_page_fault_flush_page_table = MALI_INVALID_PAGE;
static u32 mali_page_fault_flush_data_page = MALI_INVALID_PAGE;
/* an empty page directory (no address valid) which is active on any MMU not currently marked as in use */
static u32 mali_empty_page_directory = MALI_INVALID_PAGE;
_mali_osk_errcode_t mali_mmu_initialize(void)
{
/* allocate the helper pages */
mali_empty_page_directory = mali_allocate_empty_page();
if(0 == mali_empty_page_directory)
{
mali_empty_page_directory = MALI_INVALID_PAGE;
return _MALI_OSK_ERR_NOMEM;
}
if (_MALI_OSK_ERR_OK != mali_create_fault_flush_pages(&mali_page_fault_flush_page_directory,
&mali_page_fault_flush_page_table, &mali_page_fault_flush_data_page))
{
mali_free_empty_page(mali_empty_page_directory);
return _MALI_OSK_ERR_FAULT;
}
return _MALI_OSK_ERR_OK;
}
void mali_mmu_terminate(void)
{
MALI_DEBUG_PRINT(3, ("Mali MMU: terminating\n"));
/* Free global helper pages */
mali_free_empty_page(mali_empty_page_directory);
/* Free the page fault flush pages */
mali_destroy_fault_flush_pages(&mali_page_fault_flush_page_directory,
&mali_page_fault_flush_page_table, &mali_page_fault_flush_data_page);
}
struct mali_mmu_core *mali_mmu_create(_mali_osk_resource_t *resource, struct mali_group *group, mali_bool is_virtual)
{
struct mali_mmu_core* mmu = NULL;
MALI_DEBUG_ASSERT_POINTER(resource);
MALI_DEBUG_PRINT(2, ("Mali MMU: Creating Mali MMU: %s\n", resource->description));
mmu = _mali_osk_calloc(1,sizeof(struct mali_mmu_core));
if (NULL != mmu)
{
if (_MALI_OSK_ERR_OK == mali_hw_core_create(&mmu->hw_core, resource, MALI_MMU_REGISTERS_SIZE))
{
if (_MALI_OSK_ERR_OK == mali_group_add_mmu_core(group, mmu))
{
if (is_virtual)
{
/* Skip reset and IRQ setup for virtual MMU */
return mmu;
}
if (_MALI_OSK_ERR_OK == mali_mmu_reset(mmu))
{
/* Setup IRQ handlers (which will do IRQ probing if needed) */
mmu->irq = _mali_osk_irq_init(resource->irq,
mali_group_upper_half_mmu,
group,
mali_mmu_probe_trigger,
mali_mmu_probe_ack,
mmu,
"mali_mmu_irq_handlers");
if (NULL != mmu->irq)
{
return mmu;
}
else
{
MALI_PRINT_ERROR(("Mali MMU: Failed to setup interrupt handlers for MMU %s\n", mmu->hw_core.description));
}
}
mali_group_remove_mmu_core(group);
}
else
{
MALI_PRINT_ERROR(("Mali MMU: Failed to add core %s to group\n", mmu->hw_core.description));
}
mali_hw_core_delete(&mmu->hw_core);
}
_mali_osk_free(mmu);
}
else
{
MALI_PRINT_ERROR(("Failed to allocate memory for MMU\n"));
}
return NULL;
}
void mali_mmu_delete(struct mali_mmu_core *mmu)
{
if (NULL != mmu->irq)
{
_mali_osk_irq_term(mmu->irq);
}
mali_hw_core_delete(&mmu->hw_core);
_mali_osk_free(mmu);
}
static void mali_mmu_enable_paging(struct mali_mmu_core *mmu)
{
int i;
mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_COMMAND, MALI_MMU_COMMAND_ENABLE_PAGING);
for (i = 0; i < MALI_REG_POLL_COUNT_FAST; ++i)
{
if (mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS) & MALI_MMU_STATUS_BIT_PAGING_ENABLED)
{
break;
}
}
if (MALI_REG_POLL_COUNT_FAST == i)
{
MALI_PRINT_ERROR(("Enable paging request failed, MMU status is 0x%08X\n", mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS)));
}
}
mali_bool mali_mmu_enable_stall(struct mali_mmu_core *mmu)
{
int i;
u32 mmu_status = mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS);
if ( 0 == (mmu_status & MALI_MMU_STATUS_BIT_PAGING_ENABLED) )
{
MALI_DEBUG_PRINT(4, ("MMU stall is implicit when Paging is not enabled.\n"));
return MALI_TRUE;
}
if ( mmu_status & MALI_MMU_STATUS_BIT_PAGE_FAULT_ACTIVE )
{
MALI_DEBUG_PRINT(3, ("Aborting MMU stall request since it is in pagefault state.\n"));
return MALI_FALSE;
}
mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_COMMAND, MALI_MMU_COMMAND_ENABLE_STALL);
for (i = 0; i < MALI_REG_POLL_COUNT_FAST; ++i)
{
mmu_status = mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS);
if (mmu_status & MALI_MMU_STATUS_BIT_PAGE_FAULT_ACTIVE)
{
break;
}
if ((mmu_status & MALI_MMU_STATUS_BIT_STALL_ACTIVE) && (0 == (mmu_status & MALI_MMU_STATUS_BIT_STALL_NOT_ACTIVE)))
{
break;
}
if (0 == (mmu_status & ( MALI_MMU_STATUS_BIT_PAGING_ENABLED )))
{
break;
}
}
if (MALI_REG_POLL_COUNT_FAST == i)
{
MALI_DEBUG_PRINT(2, ("Enable stall request failed, MMU status is 0x%08X\n", mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS)));
return MALI_FALSE;
}
if ( mmu_status & MALI_MMU_STATUS_BIT_PAGE_FAULT_ACTIVE )
{
MALI_DEBUG_PRINT(2, ("Aborting MMU stall request since it has a pagefault.\n"));
return MALI_FALSE;
}
return MALI_TRUE;
}
void mali_mmu_disable_stall(struct mali_mmu_core *mmu)
{
int i;
u32 mmu_status = mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS);
if ( 0 == (mmu_status & MALI_MMU_STATUS_BIT_PAGING_ENABLED ))
{
MALI_DEBUG_PRINT(3, ("MMU disable skipped since it was not enabled.\n"));
return;
}
if (mmu_status & MALI_MMU_STATUS_BIT_PAGE_FAULT_ACTIVE)
{
MALI_DEBUG_PRINT(2, ("Aborting MMU disable stall request since it is in pagefault state.\n"));
return;
}
mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_COMMAND, MALI_MMU_COMMAND_DISABLE_STALL);
for (i = 0; i < MALI_REG_POLL_COUNT_FAST; ++i)
{
u32 status = mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS);
if ( 0 == (status & MALI_MMU_STATUS_BIT_STALL_ACTIVE) )
{
break;
}
if ( status & MALI_MMU_STATUS_BIT_PAGE_FAULT_ACTIVE )
{
break;
}
if ( 0 == (mmu_status & MALI_MMU_STATUS_BIT_PAGING_ENABLED ))
{
break;
}
}
if (MALI_REG_POLL_COUNT_FAST == i) MALI_DEBUG_PRINT(1,("Disable stall request failed, MMU status is 0x%08X\n", mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS)));
}
void mali_mmu_page_fault_done(struct mali_mmu_core *mmu)
{
MALI_DEBUG_PRINT(4, ("Mali MMU: %s: Leaving page fault mode\n", mmu->hw_core.description));
mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_COMMAND, MALI_MMU_COMMAND_PAGE_FAULT_DONE);
}
MALI_STATIC_INLINE _mali_osk_errcode_t mali_mmu_raw_reset(struct mali_mmu_core *mmu)
{
int i;
mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_DTE_ADDR, 0xCAFEBABE);
MALI_DEBUG_ASSERT(0xCAFEB000 == mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_DTE_ADDR));
mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_COMMAND, MALI_MMU_COMMAND_HARD_RESET);
for (i = 0; i < MALI_REG_POLL_COUNT_FAST; ++i)
{
if (mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_DTE_ADDR) == 0)
{
break;
}
}
if (MALI_REG_POLL_COUNT_FAST == i)
{
MALI_PRINT_ERROR(("Reset request failed, MMU status is 0x%08X\n", mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS)));
return _MALI_OSK_ERR_FAULT;
}
return _MALI_OSK_ERR_OK;
}
_mali_osk_errcode_t mali_mmu_reset(struct mali_mmu_core *mmu)
{
_mali_osk_errcode_t err = _MALI_OSK_ERR_FAULT;
mali_bool stall_success;
MALI_DEBUG_ASSERT_POINTER(mmu);
stall_success = mali_mmu_enable_stall(mmu);
if (!stall_success)
{
err = _MALI_OSK_ERR_BUSY;
}
MALI_DEBUG_PRINT(3, ("Mali MMU: mali_kernel_mmu_reset: %s\n", mmu->hw_core.description));
if (_MALI_OSK_ERR_OK == mali_mmu_raw_reset(mmu))
{
mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_INT_MASK, MALI_MMU_INTERRUPT_PAGE_FAULT | MALI_MMU_INTERRUPT_READ_BUS_ERROR);
/* no session is active, so just activate the empty page directory */
mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_DTE_ADDR, mali_empty_page_directory);
mali_mmu_enable_paging(mmu);
err = _MALI_OSK_ERR_OK;
}
mali_mmu_disable_stall(mmu);
return err;
}
mali_bool mali_mmu_zap_tlb(struct mali_mmu_core *mmu)
{
mali_bool stall_success = mali_mmu_enable_stall(mmu);
mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_COMMAND, MALI_MMU_COMMAND_ZAP_CACHE);
if (MALI_FALSE == stall_success)
{
/* False means that it is in Pagefault state. Not possible to disable_stall then */
return MALI_FALSE;
}
mali_mmu_disable_stall(mmu);
return MALI_TRUE;
}
void mali_mmu_zap_tlb_without_stall(struct mali_mmu_core *mmu)
{
mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_COMMAND, MALI_MMU_COMMAND_ZAP_CACHE);
}
void mali_mmu_invalidate_page(struct mali_mmu_core *mmu, u32 mali_address)
{
mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_ZAP_ONE_LINE, MALI_MMU_PDE_ENTRY(mali_address));
}
static void mali_mmu_activate_address_space(struct mali_mmu_core *mmu, u32 page_directory)
{
/* The MMU must be in stalled or page fault mode, for this writing to work */
MALI_DEBUG_ASSERT( 0 != ( mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS)
& (MALI_MMU_STATUS_BIT_STALL_ACTIVE|MALI_MMU_STATUS_BIT_PAGE_FAULT_ACTIVE) ) );
mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_DTE_ADDR, page_directory);
mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_COMMAND, MALI_MMU_COMMAND_ZAP_CACHE);
}
mali_bool mali_mmu_activate_page_directory(struct mali_mmu_core *mmu, struct mali_page_directory *pagedir)
{
mali_bool stall_success;
MALI_DEBUG_ASSERT_POINTER(mmu);
MALI_DEBUG_PRINT(5, ("Asked to activate page directory 0x%x on MMU %s\n", pagedir, mmu->hw_core.description));
stall_success = mali_mmu_enable_stall(mmu);
if ( MALI_FALSE==stall_success ) return MALI_FALSE;
mali_mmu_activate_address_space(mmu, pagedir->page_directory);
mali_mmu_disable_stall(mmu);
return MALI_TRUE;
}
void mali_mmu_activate_empty_page_directory(struct mali_mmu_core* mmu)
{
mali_bool stall_success;
MALI_DEBUG_ASSERT_POINTER(mmu);
MALI_DEBUG_PRINT(3, ("Activating the empty page directory on MMU %s\n", mmu->hw_core.description));
stall_success = mali_mmu_enable_stall(mmu);
/* This function can only be called when the core is idle, so it could not fail. */
MALI_DEBUG_ASSERT(stall_success);
MALI_IGNORE(stall_success);
mali_mmu_activate_address_space(mmu, mali_empty_page_directory);
mali_mmu_disable_stall(mmu);
}
void mali_mmu_activate_fault_flush_page_directory(struct mali_mmu_core* mmu)
{
mali_bool stall_success;
MALI_DEBUG_ASSERT_POINTER(mmu);
MALI_DEBUG_PRINT(3, ("Activating the page fault flush page directory on MMU %s\n", mmu->hw_core.description));
stall_success = mali_mmu_enable_stall(mmu);
/* This function is expect to fail the stalling, since it might be in PageFault mode when it is called */
mali_mmu_activate_address_space(mmu, mali_page_fault_flush_page_directory);
if ( MALI_TRUE==stall_success ) mali_mmu_disable_stall(mmu);
}
/* Is called when we want the mmu to give an interrupt */
static void mali_mmu_probe_trigger(void *data)
{
struct mali_mmu_core *mmu = (struct mali_mmu_core *)data;
mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_INT_RAWSTAT, MALI_MMU_INTERRUPT_PAGE_FAULT|MALI_MMU_INTERRUPT_READ_BUS_ERROR);
}
/* Is called when the irq probe wants the mmu to acknowledge an interrupt from the hw */
static _mali_osk_errcode_t mali_mmu_probe_ack(void *data)
{
struct mali_mmu_core *mmu = (struct mali_mmu_core *)data;
u32 int_stat;
int_stat = mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_INT_STATUS);
MALI_DEBUG_PRINT(2, ("mali_mmu_probe_irq_acknowledge: intstat 0x%x\n", int_stat));
if (int_stat & MALI_MMU_INTERRUPT_PAGE_FAULT)
{
MALI_DEBUG_PRINT(2, ("Probe: Page fault detect: PASSED\n"));
mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_INT_CLEAR, MALI_MMU_INTERRUPT_PAGE_FAULT);
}
else
{
MALI_DEBUG_PRINT(1, ("Probe: Page fault detect: FAILED\n"));
}
if (int_stat & MALI_MMU_INTERRUPT_READ_BUS_ERROR)
{
MALI_DEBUG_PRINT(2, ("Probe: Bus read error detect: PASSED\n"));
mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_INT_CLEAR, MALI_MMU_INTERRUPT_READ_BUS_ERROR);
}
else
{
MALI_DEBUG_PRINT(1, ("Probe: Bus read error detect: FAILED\n"));
}
if ( (int_stat & (MALI_MMU_INTERRUPT_PAGE_FAULT|MALI_MMU_INTERRUPT_READ_BUS_ERROR)) ==
(MALI_MMU_INTERRUPT_PAGE_FAULT|MALI_MMU_INTERRUPT_READ_BUS_ERROR))
{
return _MALI_OSK_ERR_OK;
}
return _MALI_OSK_ERR_FAULT;
}
#if 0
void mali_mmu_print_state(struct mali_mmu_core *mmu)
{
MALI_DEBUG_PRINT(2, ("MMU: State of %s is 0x%08x\n", mmu->hw_core.description, mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS)));
}
#endif