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linux-next/drivers/gpu/drm/panfrost/panfrost_mmu.c
Boris Brezillon 9870dc39dc drm/panfrost: Make sure a BO is only unmapped when appropriate
mmu_ops->unmap() will fail when called on a BO that has not been
previously mapped, and the error path in panfrost_ioctl_create_bo()
can call drm_gem_object_put_unlocked() (which in turn calls
panfrost_mmu_unmap()) on a BO that has not been mapped yet.

Keep track of the mapped/unmapped state to avoid such issues.

Fixes: f3ba91228e ("drm/panfrost: Add initial panfrost driver")
Cc: <stable@vger.kernel.org>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190618081343.16927-1-boris.brezillon@collabora.com
2019-06-18 09:26:28 -06:00

395 lines
9.5 KiB
C

// SPDX-License-Identifier: GPL-2.0
/* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */
#include <linux/bitfield.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/io-pgtable.h>
#include <linux/iommu.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/sizes.h>
#include "panfrost_device.h"
#include "panfrost_mmu.h"
#include "panfrost_gem.h"
#include "panfrost_features.h"
#include "panfrost_regs.h"
#define mmu_write(dev, reg, data) writel(data, dev->iomem + reg)
#define mmu_read(dev, reg) readl(dev->iomem + reg)
struct panfrost_mmu {
struct io_pgtable_cfg pgtbl_cfg;
struct io_pgtable_ops *pgtbl_ops;
struct mutex lock;
};
static int wait_ready(struct panfrost_device *pfdev, u32 as_nr)
{
int ret;
u32 val;
/* Wait for the MMU status to indicate there is no active command, in
* case one is pending. */
ret = readl_relaxed_poll_timeout_atomic(pfdev->iomem + AS_STATUS(as_nr),
val, !(val & AS_STATUS_AS_ACTIVE), 10, 1000);
if (ret)
dev_err(pfdev->dev, "AS_ACTIVE bit stuck\n");
return ret;
}
static int write_cmd(struct panfrost_device *pfdev, u32 as_nr, u32 cmd)
{
int status;
/* write AS_COMMAND when MMU is ready to accept another command */
status = wait_ready(pfdev, as_nr);
if (!status)
mmu_write(pfdev, AS_COMMAND(as_nr), cmd);
return status;
}
static void lock_region(struct panfrost_device *pfdev, u32 as_nr,
u64 iova, size_t size)
{
u8 region_width;
u64 region = iova & PAGE_MASK;
/*
* fls returns:
* 1 .. 32
*
* 10 + fls(num_pages)
* results in the range (11 .. 42)
*/
size = round_up(size, PAGE_SIZE);
region_width = 10 + fls(size >> PAGE_SHIFT);
if ((size >> PAGE_SHIFT) != (1ul << (region_width - 11))) {
/* not pow2, so must go up to the next pow2 */
region_width += 1;
}
region |= region_width;
/* Lock the region that needs to be updated */
mmu_write(pfdev, AS_LOCKADDR_LO(as_nr), region & 0xFFFFFFFFUL);
mmu_write(pfdev, AS_LOCKADDR_HI(as_nr), (region >> 32) & 0xFFFFFFFFUL);
write_cmd(pfdev, as_nr, AS_COMMAND_LOCK);
}
static int mmu_hw_do_operation(struct panfrost_device *pfdev, u32 as_nr,
u64 iova, size_t size, u32 op)
{
unsigned long flags;
int ret;
spin_lock_irqsave(&pfdev->hwaccess_lock, flags);
if (op != AS_COMMAND_UNLOCK)
lock_region(pfdev, as_nr, iova, size);
/* Run the MMU operation */
write_cmd(pfdev, as_nr, op);
/* Wait for the flush to complete */
ret = wait_ready(pfdev, as_nr);
spin_unlock_irqrestore(&pfdev->hwaccess_lock, flags);
return ret;
}
void panfrost_mmu_enable(struct panfrost_device *pfdev, u32 as_nr)
{
struct io_pgtable_cfg *cfg = &pfdev->mmu->pgtbl_cfg;
u64 transtab = cfg->arm_mali_lpae_cfg.transtab;
u64 memattr = cfg->arm_mali_lpae_cfg.memattr;
mmu_write(pfdev, MMU_INT_CLEAR, ~0);
mmu_write(pfdev, MMU_INT_MASK, ~0);
mmu_write(pfdev, AS_TRANSTAB_LO(as_nr), transtab & 0xffffffffUL);
mmu_write(pfdev, AS_TRANSTAB_HI(as_nr), transtab >> 32);
/* Need to revisit mem attrs.
* NC is the default, Mali driver is inner WT.
*/
mmu_write(pfdev, AS_MEMATTR_LO(as_nr), memattr & 0xffffffffUL);
mmu_write(pfdev, AS_MEMATTR_HI(as_nr), memattr >> 32);
write_cmd(pfdev, as_nr, AS_COMMAND_UPDATE);
}
static void mmu_disable(struct panfrost_device *pfdev, u32 as_nr)
{
mmu_write(pfdev, AS_TRANSTAB_LO(as_nr), 0);
mmu_write(pfdev, AS_TRANSTAB_HI(as_nr), 0);
mmu_write(pfdev, AS_MEMATTR_LO(as_nr), 0);
mmu_write(pfdev, AS_MEMATTR_HI(as_nr), 0);
write_cmd(pfdev, as_nr, AS_COMMAND_UPDATE);
}
static size_t get_pgsize(u64 addr, size_t size)
{
if (addr & (SZ_2M - 1) || size < SZ_2M)
return SZ_4K;
return SZ_2M;
}
int panfrost_mmu_map(struct panfrost_gem_object *bo)
{
struct drm_gem_object *obj = &bo->base.base;
struct panfrost_device *pfdev = to_panfrost_device(obj->dev);
struct io_pgtable_ops *ops = pfdev->mmu->pgtbl_ops;
u64 iova = bo->node.start << PAGE_SHIFT;
unsigned int count;
struct scatterlist *sgl;
struct sg_table *sgt;
int ret;
if (WARN_ON(bo->is_mapped))
return 0;
sgt = drm_gem_shmem_get_pages_sgt(obj);
if (WARN_ON(IS_ERR(sgt)))
return PTR_ERR(sgt);
ret = pm_runtime_get_sync(pfdev->dev);
if (ret < 0)
return ret;
mutex_lock(&pfdev->mmu->lock);
for_each_sg(sgt->sgl, sgl, sgt->nents, count) {
unsigned long paddr = sg_dma_address(sgl);
size_t len = sg_dma_len(sgl);
dev_dbg(pfdev->dev, "map: iova=%llx, paddr=%lx, len=%zx", iova, paddr, len);
while (len) {
size_t pgsize = get_pgsize(iova | paddr, len);
ops->map(ops, iova, paddr, pgsize, IOMMU_WRITE | IOMMU_READ);
iova += pgsize;
paddr += pgsize;
len -= pgsize;
}
}
mmu_hw_do_operation(pfdev, 0, bo->node.start << PAGE_SHIFT,
bo->node.size << PAGE_SHIFT, AS_COMMAND_FLUSH_PT);
mutex_unlock(&pfdev->mmu->lock);
pm_runtime_mark_last_busy(pfdev->dev);
pm_runtime_put_autosuspend(pfdev->dev);
bo->is_mapped = true;
return 0;
}
void panfrost_mmu_unmap(struct panfrost_gem_object *bo)
{
struct drm_gem_object *obj = &bo->base.base;
struct panfrost_device *pfdev = to_panfrost_device(obj->dev);
struct io_pgtable_ops *ops = pfdev->mmu->pgtbl_ops;
u64 iova = bo->node.start << PAGE_SHIFT;
size_t len = bo->node.size << PAGE_SHIFT;
size_t unmapped_len = 0;
int ret;
if (WARN_ON(!bo->is_mapped))
return;
dev_dbg(pfdev->dev, "unmap: iova=%llx, len=%zx", iova, len);
ret = pm_runtime_get_sync(pfdev->dev);
if (ret < 0)
return;
mutex_lock(&pfdev->mmu->lock);
while (unmapped_len < len) {
size_t unmapped_page;
size_t pgsize = get_pgsize(iova, len - unmapped_len);
unmapped_page = ops->unmap(ops, iova, pgsize);
if (!unmapped_page)
break;
iova += unmapped_page;
unmapped_len += unmapped_page;
}
mmu_hw_do_operation(pfdev, 0, bo->node.start << PAGE_SHIFT,
bo->node.size << PAGE_SHIFT, AS_COMMAND_FLUSH_PT);
mutex_unlock(&pfdev->mmu->lock);
pm_runtime_mark_last_busy(pfdev->dev);
pm_runtime_put_autosuspend(pfdev->dev);
bo->is_mapped = false;
}
static void mmu_tlb_inv_context_s1(void *cookie)
{
struct panfrost_device *pfdev = cookie;
mmu_hw_do_operation(pfdev, 0, 0, ~0UL, AS_COMMAND_FLUSH_MEM);
}
static void mmu_tlb_inv_range_nosync(unsigned long iova, size_t size,
size_t granule, bool leaf, void *cookie)
{}
static void mmu_tlb_sync_context(void *cookie)
{
//struct panfrost_device *pfdev = cookie;
// TODO: Wait 1000 GPU cycles for HW_ISSUE_6367/T60X
}
static const struct iommu_gather_ops mmu_tlb_ops = {
.tlb_flush_all = mmu_tlb_inv_context_s1,
.tlb_add_flush = mmu_tlb_inv_range_nosync,
.tlb_sync = mmu_tlb_sync_context,
};
static const char *access_type_name(struct panfrost_device *pfdev,
u32 fault_status)
{
switch (fault_status & AS_FAULTSTATUS_ACCESS_TYPE_MASK) {
case AS_FAULTSTATUS_ACCESS_TYPE_ATOMIC:
if (panfrost_has_hw_feature(pfdev, HW_FEATURE_AARCH64_MMU))
return "ATOMIC";
else
return "UNKNOWN";
case AS_FAULTSTATUS_ACCESS_TYPE_READ:
return "READ";
case AS_FAULTSTATUS_ACCESS_TYPE_WRITE:
return "WRITE";
case AS_FAULTSTATUS_ACCESS_TYPE_EX:
return "EXECUTE";
default:
WARN_ON(1);
return NULL;
}
}
static irqreturn_t panfrost_mmu_irq_handler(int irq, void *data)
{
struct panfrost_device *pfdev = data;
u32 status = mmu_read(pfdev, MMU_INT_STAT);
int i;
if (!status)
return IRQ_NONE;
dev_err(pfdev->dev, "mmu irq status=%x\n", status);
for (i = 0; status; i++) {
u32 mask = BIT(i) | BIT(i + 16);
u64 addr;
u32 fault_status;
u32 exception_type;
u32 access_type;
u32 source_id;
if (!(status & mask))
continue;
fault_status = mmu_read(pfdev, AS_FAULTSTATUS(i));
addr = mmu_read(pfdev, AS_FAULTADDRESS_LO(i));
addr |= (u64)mmu_read(pfdev, AS_FAULTADDRESS_HI(i)) << 32;
/* decode the fault status */
exception_type = fault_status & 0xFF;
access_type = (fault_status >> 8) & 0x3;
source_id = (fault_status >> 16);
/* terminal fault, print info about the fault */
dev_err(pfdev->dev,
"Unhandled Page fault in AS%d at VA 0x%016llX\n"
"Reason: %s\n"
"raw fault status: 0x%X\n"
"decoded fault status: %s\n"
"exception type 0x%X: %s\n"
"access type 0x%X: %s\n"
"source id 0x%X\n",
i, addr,
"TODO",
fault_status,
(fault_status & (1 << 10) ? "DECODER FAULT" : "SLAVE FAULT"),
exception_type, panfrost_exception_name(pfdev, exception_type),
access_type, access_type_name(pfdev, fault_status),
source_id);
mmu_write(pfdev, MMU_INT_CLEAR, mask);
status &= ~mask;
}
return IRQ_HANDLED;
};
int panfrost_mmu_init(struct panfrost_device *pfdev)
{
struct io_pgtable_ops *pgtbl_ops;
int err, irq;
pfdev->mmu = devm_kzalloc(pfdev->dev, sizeof(*pfdev->mmu), GFP_KERNEL);
if (!pfdev->mmu)
return -ENOMEM;
mutex_init(&pfdev->mmu->lock);
irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "mmu");
if (irq <= 0)
return -ENODEV;
err = devm_request_irq(pfdev->dev, irq, panfrost_mmu_irq_handler,
IRQF_SHARED, "mmu", pfdev);
if (err) {
dev_err(pfdev->dev, "failed to request mmu irq");
return err;
}
mmu_write(pfdev, MMU_INT_CLEAR, ~0);
mmu_write(pfdev, MMU_INT_MASK, ~0);
pfdev->mmu->pgtbl_cfg = (struct io_pgtable_cfg) {
.pgsize_bitmap = SZ_4K | SZ_2M,
.ias = FIELD_GET(0xff, pfdev->features.mmu_features),
.oas = FIELD_GET(0xff00, pfdev->features.mmu_features),
.tlb = &mmu_tlb_ops,
.iommu_dev = pfdev->dev,
};
pgtbl_ops = alloc_io_pgtable_ops(ARM_MALI_LPAE, &pfdev->mmu->pgtbl_cfg,
pfdev);
if (!pgtbl_ops)
return -ENOMEM;
pfdev->mmu->pgtbl_ops = pgtbl_ops;
panfrost_mmu_enable(pfdev, 0);
return 0;
}
void panfrost_mmu_fini(struct panfrost_device *pfdev)
{
mmu_write(pfdev, MMU_INT_MASK, 0);
mmu_disable(pfdev, 0);
free_io_pgtable_ops(pfdev->mmu->pgtbl_ops);
}