/*
* Copyright 2012 Advanced Micro Devices , Inc .
*
* Permission is hereby granted , free of charge , to any person obtaining a
* copy of this software and associated documentation files ( the " Software " ) ,
* to deal in the Software without restriction , including without limitation
* the rights to use , copy , modify , merge , publish , distribute , sublicense ,
* and / or sell copies of the Software , and to permit persons to whom the
* Software is furnished to do so , subject to the following conditions :
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software .
*
* THE SOFTWARE IS PROVIDED " AS IS " , WITHOUT WARRANTY OF ANY KIND , EXPRESS OR
* IMPLIED , INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY ,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT . IN NO EVENT SHALL
* THE COPYRIGHT HOLDER ( S ) OR AUTHOR ( S ) BE LIABLE FOR ANY CLAIM , DAMAGES OR
* OTHER LIABILITY , WHETHER IN AN ACTION OF CONTRACT , TORT OR OTHERWISE ,
* ARISING FROM , OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE .
*
*/
#include <linux/pci.h>
#include "amdgpu.h"
#include "amdgpu_ih.h"
#include "cikd.h"
#include "bif/bif_4_1_d.h"
#include "bif/bif_4_1_sh_mask.h"
#include "oss/oss_2_0_d.h"
#include "oss/oss_2_0_sh_mask.h"
/*
* Interrupts
* Starting with r6xx , interrupts are handled via a ring buffer .
* Ring buffers are areas of GPU accessible memory that the GPU
* writes interrupt vectors into and the host reads vectors out of .
* There is a rptr ( read pointer ) that determines where the
* host is currently reading , and a wptr ( write pointer )
* which determines where the GPU has written . When the
* pointers are equal , the ring is idle . When the GPU
* writes vectors to the ring buffer , it increments the
* wptr . When there is an interrupt , the host then starts
* fetching commands and processing them until the pointers are
* equal again at which point it updates the rptr .
*/
static void cik_ih_set_interrupt_funcs(struct amdgpu_device *adev);
/**
* cik_ih_enable_interrupts - Enable the interrupt ring buffer
*
* @ adev : amdgpu_device pointer
*
* Enable the interrupt ring buffer ( CIK ) .
*/
static void cik_ih_enable_interrupts(struct amdgpu_device *adev)
{
u32 ih_cntl = RREG32(mmIH_CNTL);
u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL);
ih_cntl |= IH_CNTL__ENABLE_INTR_MASK;
ih_rb_cntl |= IH_RB_CNTL__RB_ENABLE_MASK;
WREG32(mmIH_CNTL, ih_cntl);
WREG32(mmIH_RB_CNTL, ih_rb_cntl);
adev->irq.ih.enabled = true ;
}
/**
* cik_ih_disable_interrupts - Disable the interrupt ring buffer
*
* @ adev : amdgpu_device pointer
*
* Disable the interrupt ring buffer ( CIK ) .
*/
static void cik_ih_disable_interrupts(struct amdgpu_device *adev)
{
u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL);
u32 ih_cntl = RREG32(mmIH_CNTL);
ih_rb_cntl &= ~IH_RB_CNTL__RB_ENABLE_MASK;
ih_cntl &= ~IH_CNTL__ENABLE_INTR_MASK;
WREG32(mmIH_RB_CNTL, ih_rb_cntl);
WREG32(mmIH_CNTL, ih_cntl);
/* set rptr, wptr to 0 */
WREG32(mmIH_RB_RPTR, 0 );
WREG32(mmIH_RB_WPTR, 0 );
adev->irq.ih.enabled = false ;
adev->irq.ih.rptr = 0 ;
}
/**
* cik_ih_irq_init - init and enable the interrupt ring
*
* @ adev : amdgpu_device pointer
*
* Allocate a ring buffer for the interrupt controller ,
* enable the RLC , disable interrupts , enable the IH
* ring buffer and enable it ( CIK ) .
* Called at device load and reume .
* Returns 0 for success , errors for failure .
*/
static int cik_ih_irq_init(struct amdgpu_device *adev)
{
struct amdgpu_ih_ring *ih = &adev->irq.ih;
int rb_bufsz;
u32 interrupt_cntl, ih_cntl, ih_rb_cntl;
/* disable irqs */
cik_ih_disable_interrupts(adev);
/* setup interrupt control */
WREG32(mmINTERRUPT_CNTL2, adev->dummy_page_addr >> 8 );
interrupt_cntl = RREG32(mmINTERRUPT_CNTL);
/* INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=0 - dummy read disabled with msi, enabled without msi
* INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK = 1 - dummy read controlled by IH_DUMMY_RD_EN
*/
interrupt_cntl &= ~INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK;
/* INTERRUPT_CNTL__IH_REQ_NONSNOOP_EN_MASK=1 if ring is in non-cacheable memory, e.g., vram */
interrupt_cntl &= ~INTERRUPT_CNTL__IH_REQ_NONSNOOP_EN_MASK;
WREG32(mmINTERRUPT_CNTL, interrupt_cntl);
WREG32(mmIH_RB_BASE, adev->irq.ih.gpu_addr >> 8 );
rb_bufsz = order_base_2(adev->irq.ih.ring_size / 4 );
ih_rb_cntl = (IH_RB_CNTL__WPTR_OVERFLOW_ENABLE_MASK |
IH_RB_CNTL__WPTR_OVERFLOW_CLEAR_MASK |
(rb_bufsz << 1 ));
ih_rb_cntl |= IH_RB_CNTL__WPTR_WRITEBACK_ENABLE_MASK;
/* set the writeback address whether it's enabled or not */
WREG32(mmIH_RB_WPTR_ADDR_LO, lower_32_bits(ih->wptr_addr));
WREG32(mmIH_RB_WPTR_ADDR_HI, upper_32_bits(ih->wptr_addr) & 0 xFF);
WREG32(mmIH_RB_CNTL, ih_rb_cntl);
/* set rptr, wptr to 0 */
WREG32(mmIH_RB_RPTR, 0 );
WREG32(mmIH_RB_WPTR, 0 );
/* Default settings for IH_CNTL (disabled at first) */
ih_cntl = (0 x10 << IH_CNTL__MC_WRREQ_CREDIT__SHIFT) |
(0 x10 << IH_CNTL__MC_WR_CLEAN_CNT__SHIFT) |
(0 << IH_CNTL__MC_VMID__SHIFT);
/* IH_CNTL__RPTR_REARM_MASK only works if msi's are enabled */
if (adev->irq.msi_enabled)
ih_cntl |= IH_CNTL__RPTR_REARM_MASK;
WREG32(mmIH_CNTL, ih_cntl);
pci_set_master(adev->pdev);
/* enable irqs */
cik_ih_enable_interrupts(adev);
return 0 ;
}
/**
* cik_ih_irq_disable - disable interrupts
*
* @ adev : amdgpu_device pointer
*
* Disable interrupts on the hw ( CIK ) .
*/
static void cik_ih_irq_disable(struct amdgpu_device *adev)
{
cik_ih_disable_interrupts(adev);
/* Wait and acknowledge irq */
mdelay(1 );
}
/**
* cik_ih_get_wptr - get the IH ring buffer wptr
*
* @ adev : amdgpu_device pointer
* @ ih : IH ring buffer to fetch wptr
*
* Get the IH ring buffer wptr from either the register
* or the writeback memory buffer ( CIK ) . Also check for
* ring buffer overflow and deal with it .
* Used by cik_irq_process ( ) .
* Returns the value of the wptr .
*/
static u32 cik_ih_get_wptr(struct amdgpu_device *adev,
struct amdgpu_ih_ring *ih)
{
u32 wptr, tmp;
wptr = le32_to_cpu(*ih->wptr_cpu);
if (wptr & IH_RB_WPTR__RB_OVERFLOW_MASK) {
wptr &= ~IH_RB_WPTR__RB_OVERFLOW_MASK;
/* When a ring buffer overflow happen start parsing interrupt
* from the last not overwritten vector ( wptr + 16 ) . Hopefully
* this should allow us to catchup .
*/
dev_warn(adev->dev, "IH ring buffer overflow (0x%08X, 0x%08X, 0x%08X)\n" ,
wptr, ih->rptr, (wptr + 16 ) & ih->ptr_mask);
ih->rptr = (wptr + 16 ) & ih->ptr_mask;
tmp = RREG32(mmIH_RB_CNTL);
tmp |= IH_RB_CNTL__WPTR_OVERFLOW_CLEAR_MASK;
WREG32(mmIH_RB_CNTL, tmp);
/* Unset the CLEAR_OVERFLOW bit immediately so new overflows
* can be detected .
*/
tmp &= ~IH_RB_CNTL__WPTR_OVERFLOW_CLEAR_MASK;
WREG32(mmIH_RB_CNTL, tmp);
}
return (wptr & ih->ptr_mask);
}
/* CIK IV Ring
* Each IV ring entry is 128 bits :
* [ 7 : 0 ] - interrupt source id
* [ 31 : 8 ] - reserved
* [ 59 : 32 ] - interrupt source data
* [ 63 : 60 ] - reserved
* [ 71 : 64 ] - RINGID
* CP :
* ME_ID [ 1 : 0 ] , PIPE_ID [ 1 : 0 ] , QUEUE_ID [ 2 : 0 ]
* QUEUE_ID - for compute , which of the 8 queues owned by the dispatcher
* - for gfx , hw shader state ( 0 = PS . . . 5 = LS , 6 = CS )
* ME_ID - 0 = gfx , 1 = first 4 CS pipes , 2 = second 4 CS pipes
* PIPE_ID - ME0 0 = 3 D
* - ME1 & 2 compute dispatcher ( 4 pipes each )
* SDMA :
* INSTANCE_ID [ 1 : 0 ] , QUEUE_ID [ 1 : 0 ]
* INSTANCE_ID - 0 = sdma0 , 1 = sdma1
* QUEUE_ID - 0 = gfx , 1 = rlc0 , 2 = rlc1
* [ 79 : 72 ] - VMID
* [ 95 : 80 ] - PASID
* [ 127 : 96 ] - reserved
*/
/**
* cik_ih_decode_iv - decode an interrupt vector
*
* @ adev : amdgpu_device pointer
*
* Decodes the interrupt vector at the current rptr
* position and also advance the position .
*/
static void cik_ih_decode_iv(struct amdgpu_device *adev,
struct amdgpu_ih_ring *ih,
struct amdgpu_iv_entry *entry)
{
/* wptr/rptr are in bytes! */
u32 ring_index = ih->rptr >> 2 ;
uint32_t dw[4 ];
dw[0 ] = le32_to_cpu(ih->ring[ring_index + 0 ]);
dw[1 ] = le32_to_cpu(ih->ring[ring_index + 1 ]);
dw[2 ] = le32_to_cpu(ih->ring[ring_index + 2 ]);
dw[3 ] = le32_to_cpu(ih->ring[ring_index + 3 ]);
entry->client_id = AMDGPU_IRQ_CLIENTID_LEGACY;
entry->src_id = dw[0 ] & 0 xff;
entry->src_data[0 ] = dw[1 ] & 0 xfffffff;
entry->ring_id = dw[2 ] & 0 xff;
entry->vmid = (dw[2 ] >> 8 ) & 0 xff;
entry->pasid = (dw[2 ] >> 16 ) & 0 xffff;
/* wptr/rptr are in bytes! */
ih->rptr += 16 ;
}
/**
* cik_ih_set_rptr - set the IH ring buffer rptr
*
* @ adev : amdgpu_device pointer
* @ ih : IH ring buffer to set wptr
*
* Set the IH ring buffer rptr .
*/
static void cik_ih_set_rptr(struct amdgpu_device *adev,
struct amdgpu_ih_ring *ih)
{
WREG32(mmIH_RB_RPTR, ih->rptr);
}
static int cik_ih_early_init(struct amdgpu_ip_block *ip_block)
{
struct amdgpu_device *adev = ip_block->adev;
int ret;
ret = amdgpu_irq_add_domain(adev);
if (ret)
return ret;
cik_ih_set_interrupt_funcs(adev);
return 0 ;
}
static int cik_ih_sw_init(struct amdgpu_ip_block *ip_block)
{
int r;
struct amdgpu_device *adev = ip_block->adev;
r = amdgpu_ih_ring_init(adev, &adev->irq.ih, 64 * 1024 , false );
if (r)
return r;
r = amdgpu_irq_init(adev);
return r;
}
static int cik_ih_sw_fini(struct amdgpu_ip_block *ip_block)
{
struct amdgpu_device *adev = ip_block->adev;
amdgpu_irq_fini_sw(adev);
amdgpu_irq_remove_domain(adev);
return 0 ;
}
static int cik_ih_hw_init(struct amdgpu_ip_block *ip_block)
{
struct amdgpu_device *adev = ip_block->adev;
return cik_ih_irq_init(adev);
}
static int cik_ih_hw_fini(struct amdgpu_ip_block *ip_block)
{
cik_ih_irq_disable(ip_block->adev);
return 0 ;
}
static int cik_ih_suspend(struct amdgpu_ip_block *ip_block)
{
return cik_ih_hw_fini(ip_block);
}
static int cik_ih_resume(struct amdgpu_ip_block *ip_block)
{
return cik_ih_hw_init(ip_block);
}
static bool cik_ih_is_idle(struct amdgpu_ip_block *ip_block)
{
struct amdgpu_device *adev = ip_block->adev;
u32 tmp = RREG32(mmSRBM_STATUS);
if (tmp & SRBM_STATUS__IH_BUSY_MASK)
return false ;
return true ;
}
static int cik_ih_wait_for_idle(struct amdgpu_ip_block *ip_block)
{
unsigned i;
u32 tmp;
struct amdgpu_device *adev = ip_block->adev;
for (i = 0 ; i < adev->usec_timeout; i++) {
/* read MC_STATUS */
tmp = RREG32(mmSRBM_STATUS) & SRBM_STATUS__IH_BUSY_MASK;
if (!tmp)
return 0 ;
udelay(1 );
}
return -ETIMEDOUT;
}
static int cik_ih_soft_reset(struct amdgpu_ip_block *ip_block)
{
struct amdgpu_device *adev = ip_block->adev;
u32 srbm_soft_reset = 0 ;
u32 tmp = RREG32(mmSRBM_STATUS);
if (tmp & SRBM_STATUS__IH_BUSY_MASK)
srbm_soft_reset |= SRBM_SOFT_RESET__SOFT_RESET_IH_MASK;
if (srbm_soft_reset) {
tmp = RREG32(mmSRBM_SOFT_RESET);
tmp |= srbm_soft_reset;
dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n" , tmp);
WREG32(mmSRBM_SOFT_RESET, tmp);
tmp = RREG32(mmSRBM_SOFT_RESET);
udelay(50 );
tmp &= ~srbm_soft_reset;
WREG32(mmSRBM_SOFT_RESET, tmp);
tmp = RREG32(mmSRBM_SOFT_RESET);
/* Wait a little for things to settle down */
udelay(50 );
}
return 0 ;
}
static int cik_ih_set_clockgating_state(struct amdgpu_ip_block *ip_block,
enum amd_clockgating_state state)
{
return 0 ;
}
static int cik_ih_set_powergating_state(struct amdgpu_ip_block *ip_block,
enum amd_powergating_state state)
{
return 0 ;
}
static const struct amd_ip_funcs cik_ih_ip_funcs = {
.name = "cik_ih" ,
.early_init = cik_ih_early_init,
.sw_init = cik_ih_sw_init,
.sw_fini = cik_ih_sw_fini,
.hw_init = cik_ih_hw_init,
.hw_fini = cik_ih_hw_fini,
.suspend = cik_ih_suspend,
.resume = cik_ih_resume,
.is_idle = cik_ih_is_idle,
.wait_for_idle = cik_ih_wait_for_idle,
.soft_reset = cik_ih_soft_reset,
.set_clockgating_state = cik_ih_set_clockgating_state,
.set_powergating_state = cik_ih_set_powergating_state,
};
static const struct amdgpu_ih_funcs cik_ih_funcs = {
.get_wptr = cik_ih_get_wptr,
.decode_iv = cik_ih_decode_iv,
.set_rptr = cik_ih_set_rptr
};
static void cik_ih_set_interrupt_funcs(struct amdgpu_device *adev)
{
adev->irq.ih_funcs = &cik_ih_funcs;
}
const struct amdgpu_ip_block_version cik_ih_ip_block = {
.type = AMD_IP_BLOCK_TYPE_IH,
.major = 2 ,
.minor = 0 ,
.rev = 0 ,
.funcs = &cik_ih_ip_funcs,
};
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