[PATCH 5.10 299/306] drm/panfrost: Make sure MMU context lifetime is not bound to panfrost_priv

From: Boris Brezillon boris.brezillon@collabora.com

commit 7fdc48cc63a30fa3480d18bdd8c5fff2b9b15212 upstream.

Jobs can be in-flight when the file descriptor is closed (either because the process did not terminate properly, or because it didn't wait for all GPU jobs to be finished), and apparently panfrost_job_close() does not cancel already running jobs. Let's refcount the MMU context object so it's lifetime is no longer bound to the FD lifetime and running jobs can finish properly without generating spurious page faults.

Reported-by: Icecream95 ixn@keemail.me Fixes: 7282f7645d06 ("drm/panfrost: Implement per FD address spaces") Cc: stable@vger.kernel.org Signed-off-by: Boris Brezillon boris.brezillon@collabora.com Reviewed-by: Steven Price steven.price@arm.com Link: https://patchwork.freedesktop.org/patch/msgid/20210621133907.1683899-2-boris... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/panfrost/panfrost_device.h | 8 - drivers/gpu/drm/panfrost/panfrost_drv.c | 50 +-------- drivers/gpu/drm/panfrost/panfrost_gem.c | 20 +-- drivers/gpu/drm/panfrost/panfrost_job.c | 4 drivers/gpu/drm/panfrost/panfrost_mmu.c | 160 +++++++++++++++++++---------- drivers/gpu/drm/panfrost/panfrost_mmu.h | 5 6 files changed, 136 insertions(+), 111 deletions(-)

--- a/drivers/gpu/drm/panfrost/panfrost_device.h +++ b/drivers/gpu/drm/panfrost/panfrost_device.h @@ -120,8 +120,12 @@ struct panfrost_device { };

struct panfrost_mmu { + struct panfrost_device *pfdev; + struct kref refcount; struct io_pgtable_cfg pgtbl_cfg; struct io_pgtable_ops *pgtbl_ops; + struct drm_mm mm; + spinlock_t mm_lock; int as; atomic_t as_count; struct list_head list; @@ -132,9 +136,7 @@ struct panfrost_file_priv {

struct drm_sched_entity sched_entity[NUM_JOB_SLOTS];

- struct panfrost_mmu mmu; - struct drm_mm mm; - spinlock_t mm_lock; + struct panfrost_mmu *mmu; };

static inline struct panfrost_device *to_panfrost_device(struct drm_device *ddev) --- a/drivers/gpu/drm/panfrost/panfrost_drv.c +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c @@ -417,7 +417,7 @@ static int panfrost_ioctl_madvise(struct * anyway, so let's not bother. */ if (!list_is_singular(&bo->mappings.list) || - WARN_ON_ONCE(first->mmu != &priv->mmu)) { + WARN_ON_ONCE(first->mmu != priv->mmu)) { ret = -EINVAL; goto out_unlock_mappings; } @@ -449,32 +449,6 @@ int panfrost_unstable_ioctl_check(void) return 0; }

-#define PFN_4G (SZ_4G >> PAGE_SHIFT) -#define PFN_4G_MASK (PFN_4G - 1) -#define PFN_16M (SZ_16M >> PAGE_SHIFT) - -static void panfrost_drm_mm_color_adjust(const struct drm_mm_node *node, - unsigned long color, - u64 *start, u64 *end) -{ - /* Executable buffers can't start or end on a 4GB boundary */ - if (!(color & PANFROST_BO_NOEXEC)) { - u64 next_seg; - - if ((*start & PFN_4G_MASK) == 0) - (*start)++; - - if ((*end & PFN_4G_MASK) == 0) - (*end)--; - - next_seg = ALIGN(*start, PFN_4G); - if (next_seg - *start <= PFN_16M) - *start = next_seg + 1; - - *end = min(*end, ALIGN(*start, PFN_4G) - 1); - } -} - static int panfrost_open(struct drm_device *dev, struct drm_file *file) { @@ -489,15 +463,11 @@ panfrost_open(struct drm_device *dev, st panfrost_priv->pfdev = pfdev; file->driver_priv = panfrost_priv;

- spin_lock_init(&panfrost_priv->mm_lock); - - /* 4G enough for now. can be 48-bit */ - drm_mm_init(&panfrost_priv->mm, SZ_32M >> PAGE_SHIFT, (SZ_4G - SZ_32M) >> PAGE_SHIFT); - panfrost_priv->mm.color_adjust = panfrost_drm_mm_color_adjust; - - ret = panfrost_mmu_pgtable_alloc(panfrost_priv); - if (ret) - goto err_pgtable; + panfrost_priv->mmu = panfrost_mmu_ctx_create(pfdev); + if (IS_ERR(panfrost_priv->mmu)) { + ret = PTR_ERR(panfrost_priv->mmu); + goto err_free; + }

ret = panfrost_job_open(panfrost_priv); if (ret) @@ -506,9 +476,8 @@ panfrost_open(struct drm_device *dev, st return 0;

err_job: - panfrost_mmu_pgtable_free(panfrost_priv); -err_pgtable: - drm_mm_takedown(&panfrost_priv->mm); + panfrost_mmu_ctx_put(panfrost_priv->mmu); +err_free: kfree(panfrost_priv); return ret; } @@ -521,8 +490,7 @@ panfrost_postclose(struct drm_device *de panfrost_perfcnt_close(file); panfrost_job_close(panfrost_priv);

- panfrost_mmu_pgtable_free(panfrost_priv); - drm_mm_takedown(&panfrost_priv->mm); + panfrost_mmu_ctx_put(panfrost_priv->mmu); kfree(panfrost_priv); }

--- a/drivers/gpu/drm/panfrost/panfrost_gem.c +++ b/drivers/gpu/drm/panfrost/panfrost_gem.c @@ -60,7 +60,7 @@ panfrost_gem_mapping_get(struct panfrost

mutex_lock(&bo->mappings.lock); list_for_each_entry(iter, &bo->mappings.list, node) { - if (iter->mmu == &priv->mmu) { + if (iter->mmu == priv->mmu) { kref_get(&iter->refcount); mapping = iter; break; @@ -74,16 +74,13 @@ panfrost_gem_mapping_get(struct panfrost static void panfrost_gem_teardown_mapping(struct panfrost_gem_mapping *mapping) { - struct panfrost_file_priv *priv; - if (mapping->active) panfrost_mmu_unmap(mapping);

- priv = container_of(mapping->mmu, struct panfrost_file_priv, mmu); - spin_lock(&priv->mm_lock); + spin_lock(&mapping->mmu->mm_lock); if (drm_mm_node_allocated(&mapping->mmnode)) drm_mm_remove_node(&mapping->mmnode); - spin_unlock(&priv->mm_lock); + spin_unlock(&mapping->mmu->mm_lock); }

static void panfrost_gem_mapping_release(struct kref *kref) @@ -94,6 +91,7 @@ static void panfrost_gem_mapping_release

panfrost_gem_teardown_mapping(mapping); drm_gem_object_put(&mapping->obj->base.base); + panfrost_mmu_ctx_put(mapping->mmu); kfree(mapping); }

@@ -143,11 +141,11 @@ int panfrost_gem_open(struct drm_gem_obj else align = size >= SZ_2M ? SZ_2M >> PAGE_SHIFT : 0;

- mapping->mmu = &priv->mmu; - spin_lock(&priv->mm_lock); - ret = drm_mm_insert_node_generic(&priv->mm, &mapping->mmnode, + mapping->mmu = panfrost_mmu_ctx_get(priv->mmu); + spin_lock(&mapping->mmu->mm_lock); + ret = drm_mm_insert_node_generic(&mapping->mmu->mm, &mapping->mmnode, size >> PAGE_SHIFT, align, color, 0); - spin_unlock(&priv->mm_lock); + spin_unlock(&mapping->mmu->mm_lock); if (ret) goto err;

@@ -176,7 +174,7 @@ void panfrost_gem_close(struct drm_gem_o

mutex_lock(&bo->mappings.lock); list_for_each_entry(iter, &bo->mappings.list, node) { - if (iter->mmu == &priv->mmu) { + if (iter->mmu == priv->mmu) { mapping = iter; list_del(&iter->node); break; --- a/drivers/gpu/drm/panfrost/panfrost_job.c +++ b/drivers/gpu/drm/panfrost/panfrost_job.c @@ -165,7 +165,7 @@ static void panfrost_job_hw_submit(struc return; }

- cfg = panfrost_mmu_as_get(pfdev, &job->file_priv->mmu); + cfg = panfrost_mmu_as_get(pfdev, job->file_priv->mmu);

job_write(pfdev, JS_HEAD_NEXT_LO(js), jc_head & 0xFFFFFFFF); job_write(pfdev, JS_HEAD_NEXT_HI(js), jc_head >> 32); @@ -524,7 +524,7 @@ static irqreturn_t panfrost_job_irq_hand if (job) { pfdev->jobs[j] = NULL;

- panfrost_mmu_as_put(pfdev, &job->file_priv->mmu); + panfrost_mmu_as_put(pfdev, job->file_priv->mmu); panfrost_devfreq_record_idle(&pfdev->pfdevfreq);

dma_fence_signal_locked(job->done_fence); --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c @@ -1,5 +1,8 @@ // SPDX-License-Identifier: GPL-2.0 /* Copyright 2019 Linaro, Ltd, Rob Herring robh@kernel.org */ + +#include <drm/panfrost_drm.h> + #include <linux/atomic.h> #include <linux/bitfield.h> #include <linux/delay.h> @@ -337,7 +340,7 @@ static void mmu_tlb_inv_context_s1(void

static void mmu_tlb_sync_context(void *cookie) { - //struct panfrost_device *pfdev = cookie; + //struct panfrost_mmu *mmu = cookie; // TODO: Wait 1000 GPU cycles for HW_ISSUE_6367/T60X }

@@ -359,57 +362,10 @@ static const struct iommu_flush_ops mmu_ .tlb_flush_leaf = mmu_tlb_flush_leaf, };

-int panfrost_mmu_pgtable_alloc(struct panfrost_file_priv *priv) -{ - struct panfrost_mmu *mmu = &priv->mmu; - struct panfrost_device *pfdev = priv->pfdev; - - INIT_LIST_HEAD(&mmu->list); - mmu->as = -1; - - 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), - .coherent_walk = pfdev->coherent, - .tlb = &mmu_tlb_ops, - .iommu_dev = pfdev->dev, - }; - - mmu->pgtbl_ops = alloc_io_pgtable_ops(ARM_MALI_LPAE, &mmu->pgtbl_cfg, - priv); - if (!mmu->pgtbl_ops) - return -EINVAL; - - return 0; -} - -void panfrost_mmu_pgtable_free(struct panfrost_file_priv *priv) -{ - struct panfrost_device *pfdev = priv->pfdev; - struct panfrost_mmu *mmu = &priv->mmu; - - spin_lock(&pfdev->as_lock); - if (mmu->as >= 0) { - pm_runtime_get_noresume(pfdev->dev); - if (pm_runtime_active(pfdev->dev)) - panfrost_mmu_disable(pfdev, mmu->as); - pm_runtime_put_autosuspend(pfdev->dev); - - clear_bit(mmu->as, &pfdev->as_alloc_mask); - clear_bit(mmu->as, &pfdev->as_in_use_mask); - list_del(&mmu->list); - } - spin_unlock(&pfdev->as_lock); - - free_io_pgtable_ops(mmu->pgtbl_ops); -} - static struct panfrost_gem_mapping * addr_to_mapping(struct panfrost_device *pfdev, int as, u64 addr) { struct panfrost_gem_mapping *mapping = NULL; - struct panfrost_file_priv *priv; struct drm_mm_node *node; u64 offset = addr >> PAGE_SHIFT; struct panfrost_mmu *mmu; @@ -422,11 +378,10 @@ addr_to_mapping(struct panfrost_device * goto out;

found_mmu: - priv = container_of(mmu, struct panfrost_file_priv, mmu);

- spin_lock(&priv->mm_lock); + spin_lock(&mmu->mm_lock);

- drm_mm_for_each_node(node, &priv->mm) { + drm_mm_for_each_node(node, &mmu->mm) { if (offset >= node->start && offset < (node->start + node->size)) { mapping = drm_mm_node_to_panfrost_mapping(node); @@ -436,7 +391,7 @@ found_mmu: } }

- spin_unlock(&priv->mm_lock); + spin_unlock(&mmu->mm_lock); out: spin_unlock(&pfdev->as_lock); return mapping; @@ -549,6 +504,107 @@ err_bo: return ret; }

+static void panfrost_mmu_release_ctx(struct kref *kref) +{ + struct panfrost_mmu *mmu = container_of(kref, struct panfrost_mmu, + refcount); + struct panfrost_device *pfdev = mmu->pfdev; + + spin_lock(&pfdev->as_lock); + if (mmu->as >= 0) { + pm_runtime_get_noresume(pfdev->dev); + if (pm_runtime_active(pfdev->dev)) + panfrost_mmu_disable(pfdev, mmu->as); + pm_runtime_put_autosuspend(pfdev->dev); + + clear_bit(mmu->as, &pfdev->as_alloc_mask); + clear_bit(mmu->as, &pfdev->as_in_use_mask); + list_del(&mmu->list); + } + spin_unlock(&pfdev->as_lock); + + free_io_pgtable_ops(mmu->pgtbl_ops); + drm_mm_takedown(&mmu->mm); + kfree(mmu); +} + +void panfrost_mmu_ctx_put(struct panfrost_mmu *mmu) +{ + kref_put(&mmu->refcount, panfrost_mmu_release_ctx); +} + +struct panfrost_mmu *panfrost_mmu_ctx_get(struct panfrost_mmu *mmu) +{ + kref_get(&mmu->refcount); + + return mmu; +} + +#define PFN_4G (SZ_4G >> PAGE_SHIFT) +#define PFN_4G_MASK (PFN_4G - 1) +#define PFN_16M (SZ_16M >> PAGE_SHIFT) + +static void panfrost_drm_mm_color_adjust(const struct drm_mm_node *node, + unsigned long color, + u64 *start, u64 *end) +{ + /* Executable buffers can't start or end on a 4GB boundary */ + if (!(color & PANFROST_BO_NOEXEC)) { + u64 next_seg; + + if ((*start & PFN_4G_MASK) == 0) + (*start)++; + + if ((*end & PFN_4G_MASK) == 0) + (*end)--; + + next_seg = ALIGN(*start, PFN_4G); + if (next_seg - *start <= PFN_16M) + *start = next_seg + 1; + + *end = min(*end, ALIGN(*start, PFN_4G) - 1); + } +} + +struct panfrost_mmu *panfrost_mmu_ctx_create(struct panfrost_device *pfdev) +{ + struct panfrost_mmu *mmu; + + mmu = kzalloc(sizeof(*mmu), GFP_KERNEL); + if (!mmu) + return ERR_PTR(-ENOMEM); + + mmu->pfdev = pfdev; + spin_lock_init(&mmu->mm_lock); + + /* 4G enough for now. can be 48-bit */ + drm_mm_init(&mmu->mm, SZ_32M >> PAGE_SHIFT, (SZ_4G - SZ_32M) >> PAGE_SHIFT); + mmu->mm.color_adjust = panfrost_drm_mm_color_adjust; + + INIT_LIST_HEAD(&mmu->list); + mmu->as = -1; + + 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), + .coherent_walk = pfdev->coherent, + .tlb = &mmu_tlb_ops, + .iommu_dev = pfdev->dev, + }; + + mmu->pgtbl_ops = alloc_io_pgtable_ops(ARM_MALI_LPAE, &mmu->pgtbl_cfg, + mmu); + if (!mmu->pgtbl_ops) { + kfree(mmu); + return ERR_PTR(-EINVAL); + } + + kref_init(&mmu->refcount); + + return mmu; +} + static const char *access_type_name(struct panfrost_device *pfdev, u32 fault_status) { --- a/drivers/gpu/drm/panfrost/panfrost_mmu.h +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.h @@ -18,7 +18,8 @@ void panfrost_mmu_reset(struct panfrost_ u32 panfrost_mmu_as_get(struct panfrost_device *pfdev, struct panfrost_mmu *mmu); void panfrost_mmu_as_put(struct panfrost_device *pfdev, struct panfrost_mmu *mmu);

-int panfrost_mmu_pgtable_alloc(struct panfrost_file_priv *priv); -void panfrost_mmu_pgtable_free(struct panfrost_file_priv *priv); +struct panfrost_mmu *panfrost_mmu_ctx_get(struct panfrost_mmu *mmu); +void panfrost_mmu_ctx_put(struct panfrost_mmu *mmu); +struct panfrost_mmu *panfrost_mmu_ctx_create(struct panfrost_device *pfdev);

#endif