On 08/08/2019 23:29, Rob Herring wrote:
> Up until now, a single shared GPU address space was used. This is not
> ideal as there's no protection between processes and doesn't work for
> supporting the same GPU/CPU VA feature. Most importantly, this will
> hopefully mitigate Alyssa's fear of WebGL, whatever that is.
>
> Most of the changes here are moving struct drm_mm and struct
> panfrost_mmu objects from the per device struct to the per FD struct.
> The critical function is panfrost_mmu_as_get() which handles allocating
> and switching the h/w address spaces.
>
> Cc: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
> Cc: David Airlie <airlied@xxxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Cc: Robin Murphy <robin.murphy@xxxxxxx>
> Cc: Steven Price <steven.price@xxxxxxx>
> Cc: Alyssa Rosenzweig <alyssa.rosenzweig@xxxxxxxxxxxxx>
> Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
> ---
> This depends on madvise support (now in drm-misc) and the heap/no-exec
> series (just the rework). Seeems to be working pretty well for me, but
> more testing would be helpful. I've run multiple 'glmark2-es2-drm
> --off-screen' instances and Gnome Shell. Running more than 8 clients (at
> least for T860) will hit the address space switch code paths.
>
> Rob
>
> drivers/gpu/drm/panfrost/TODO | 4 -
> drivers/gpu/drm/panfrost/panfrost_device.c | 2 +
> drivers/gpu/drm/panfrost/panfrost_device.h | 24 ++-
> drivers/gpu/drm/panfrost/panfrost_drv.c | 31 ++-
> drivers/gpu/drm/panfrost/panfrost_gem.c | 15 +-
> drivers/gpu/drm/panfrost/panfrost_gem.h | 3 +
> drivers/gpu/drm/panfrost/panfrost_job.c | 12 +-
> drivers/gpu/drm/panfrost/panfrost_mmu.c | 220 +++++++++++++++------
> drivers/gpu/drm/panfrost/panfrost_mmu.h | 8 +
> 9 files changed, 239 insertions(+), 80 deletions(-)
>
> diff --git a/drivers/gpu/drm/panfrost/TODO b/drivers/gpu/drm/panfrost/TODO
> index e7727b292355..536a0d4f8d29 100644
> --- a/drivers/gpu/drm/panfrost/TODO
> +++ b/drivers/gpu/drm/panfrost/TODO
> @@ -6,10 +6,6 @@
> - Bifrost specific feature and issue handling
> - Coherent DMA support
>
> -- Per FD address space support. The h/w supports multiple addresses spaces.
> - The hard part is handling when more address spaces are needed than what
> - the h/w provides.
> -
> - Support userspace controlled GPU virtual addresses. Needed for Vulkan. (Tomeu)
>
> - Compute job support. So called 'compute only' jobs need to be plumbed up to
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
> index 9814f4ccbd26..4da71bb56c20 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.c
> @@ -123,8 +123,10 @@ int panfrost_device_init(struct panfrost_device *pfdev)
> mutex_init(&pfdev->sched_lock);
> mutex_init(&pfdev->reset_lock);
> INIT_LIST_HEAD(&pfdev->scheduled_jobs);
> + INIT_LIST_HEAD(&pfdev->as_lru_list);
>
> spin_lock_init(&pfdev->hwaccess_lock);
> + spin_lock_init(&pfdev->as_lock);
>
> err = panfrost_clk_init(pfdev);
> if (err) {
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
> index 4e5641db9c7e..f503c566e99f 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.h
> @@ -5,6 +5,8 @@
> #ifndef __PANFROST_DEVICE_H__
> #define __PANFROST_DEVICE_H__
>
> +#include <linux/atomic.h>
> +#include <linux/io-pgtable.h>
> #include <linux/spinlock.h>
> #include <drm/drm_device.h>
> #include <drm/drm_mm.h>
> @@ -63,9 +65,6 @@ struct panfrost_device {
>
> spinlock_t hwaccess_lock;
>
> - struct drm_mm mm;
> - spinlock_t mm_lock;
> -
> void __iomem *iomem;
> struct clk *clock;
> struct clk *bus_clock;
> @@ -74,7 +73,11 @@ struct panfrost_device {
>
> struct panfrost_features features;
>
> - struct panfrost_mmu *mmu;
> + spinlock_t as_lock;
> + unsigned long as_in_use_mask;
> + unsigned long as_alloc_mask;
> + struct list_head as_lru_list;
> +
> struct panfrost_job_slot *js;
>
> struct panfrost_job *jobs[NUM_JOB_SLOTS];
> @@ -98,10 +101,23 @@ struct panfrost_device {
> } devfreq;
> };
>
> +struct panfrost_mmu {
> + struct io_pgtable_cfg pgtbl_cfg;
> + struct io_pgtable_ops *pgtbl_ops;
> + struct mutex lock;
> + int as;
> + atomic_t as_count;
> + struct list_head list;
> +};
> +
> struct panfrost_file_priv {
> struct panfrost_device *pfdev;
>
> struct drm_sched_entity sched_entity[NUM_JOB_SLOTS];
> +
> + struct panfrost_mmu mmu;
> + struct drm_mm mm;
> + spinlock_t mm_lock;
> };
>
> static inline struct panfrost_device *to_panfrost_device(struct drm_device *ddev)
> diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
> index a1352750984c..7c8aa1a8054f 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_drv.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
> @@ -403,6 +403,7 @@ static void panfrost_drm_mm_color_adjust(const struct drm_mm_node *node,
> static int
> panfrost_open(struct drm_device *dev, struct drm_file *file)
> {
> + int ret;
> struct panfrost_device *pfdev = dev->dev_private;
> struct panfrost_file_priv *panfrost_priv;
>
> @@ -413,7 +414,28 @@ panfrost_open(struct drm_device *dev, struct drm_file *file)
> panfrost_priv->pfdev = pfdev;
> file->driver_priv = panfrost_priv;
>
> - return panfrost_job_open(panfrost_priv);
> + spin_lock_init(&panfrost_priv->mm_lock);
> +
> + /* 4G enough for now. can be 48-bit */
> + panfrost_priv->mm.color_adjust = panfrost_drm_mm_color_adjust;
> + drm_mm_init(&panfrost_priv->mm, SZ_32M >> PAGE_SHIFT, (SZ_4G - SZ_32M) >> PAGE_SHIFT);
> +
> + ret = panfrost_mmu_pgtable_alloc(panfrost_priv);
> + if (ret)
> + goto err_pgtable;
> +
> + ret = panfrost_job_open(panfrost_priv);
> + if (ret)
> + goto err_job;
> +
> + return 0;
> +
> +err_job:
> + panfrost_mmu_pgtable_free(panfrost_priv);
> +err_pgtable:
> + drm_mm_takedown(&panfrost_priv->mm);
> + kfree(panfrost_priv);
Looks like this kfree was missing before... :)
> + return ret;
> }
>
> static void
> @@ -424,6 +446,8 @@ panfrost_postclose(struct drm_device *dev, struct drm_file *file)
> panfrost_perfcnt_close(panfrost_priv);
> panfrost_job_close(panfrost_priv);
>
> + panfrost_mmu_pgtable_free(panfrost_priv);
> + drm_mm_takedown(&panfrost_priv->mm);
> kfree(panfrost_priv);
> }
>
> @@ -496,14 +520,9 @@ static int panfrost_probe(struct platform_device *pdev)
> ddev->dev_private = pfdev;
> pfdev->ddev = ddev;
>
> - spin_lock_init(&pfdev->mm_lock);
> mutex_init(&pfdev->shrinker_lock);
> INIT_LIST_HEAD(&pfdev->shrinker_list);
>
> - /* 4G enough for now. can be 48-bit */
> - drm_mm_init(&pfdev->mm, SZ_32M >> PAGE_SHIFT, (SZ_4G - SZ_32M) >> PAGE_SHIFT);
> - pfdev->mm.color_adjust = panfrost_drm_mm_color_adjust;
> -
> pm_runtime_use_autosuspend(pfdev->dev);
> pm_runtime_set_autosuspend_delay(pfdev->dev, 50); /* ~3 frames */
> pm_runtime_enable(pfdev->dev);
> diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.c b/drivers/gpu/drm/panfrost/panfrost_gem.c
> index 37a3a6ed4617..93204b44ef90 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_gem.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_gem.c
> @@ -47,8 +47,8 @@ static int panfrost_gem_open(struct drm_gem_object *obj, struct drm_file *file_p
> size_t size = obj->size;
> u64 align;
> struct panfrost_gem_object *bo = to_panfrost_bo(obj);
> - struct panfrost_device *pfdev = obj->dev->dev_private;
> unsigned long color = bo->noexec ? PANFROST_BO_NOEXEC : 0;
> + struct panfrost_file_priv *priv = file_priv->driver_priv;
>
> /*
> * Executable buffers cannot cross a 16MB boundary as the program
> @@ -61,8 +61,9 @@ static int panfrost_gem_open(struct drm_gem_object *obj, struct drm_file *file_p
> else
> align = size >= SZ_2M ? SZ_2M >> PAGE_SHIFT : 0;
>
> - spin_lock(&pfdev->mm_lock);
> - ret = drm_mm_insert_node_generic(&pfdev->mm, &bo->node,
> + bo->mmu = &priv->mmu;
> + spin_lock(&priv->mm_lock);
> + ret = drm_mm_insert_node_generic(&priv->mm, &bo->node,
> size >> PAGE_SHIFT, align, color, 0);
> if (ret)
> goto out;
> @@ -73,22 +74,22 @@ static int panfrost_gem_open(struct drm_gem_object *obj, struct drm_file *file_p
> drm_mm_remove_node(&bo->node);
> }
> out:
> - spin_unlock(&pfdev->mm_lock);
> + spin_unlock(&priv->mm_lock);
> return ret;
> }
>
> static void panfrost_gem_close(struct drm_gem_object *obj, struct drm_file *file_priv)
> {
> struct panfrost_gem_object *bo = to_panfrost_bo(obj);
> - struct panfrost_device *pfdev = obj->dev->dev_private;
> + struct panfrost_file_priv *priv = file_priv->driver_priv;
>
> if (bo->is_mapped)
> panfrost_mmu_unmap(bo);
>
> - spin_lock(&pfdev->mm_lock);
> + spin_lock(&priv->mm_lock);
> if (drm_mm_node_allocated(&bo->node))
> drm_mm_remove_node(&bo->node);
> - spin_unlock(&pfdev->mm_lock);
> + spin_unlock(&priv->mm_lock);
> }
>
> static int panfrost_gem_pin(struct drm_gem_object *obj)
> diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.h b/drivers/gpu/drm/panfrost/panfrost_gem.h
> index e10f58316915..50920819cc16 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_gem.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_gem.h
> @@ -7,10 +7,13 @@
> #include <drm/drm_gem_shmem_helper.h>
> #include <drm/drm_mm.h>
>
> +struct panfrost_mmu;
> +
> struct panfrost_gem_object {
> struct drm_gem_shmem_object base;
> struct sg_table *sgts;
>
> + struct panfrost_mmu *mmu;
> struct drm_mm_node node;
> bool is_mapped :1;
> bool noexec :1;
> diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
> index d567ce98494c..aea84610b8cd 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_job.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_job.c
> @@ -153,6 +153,8 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
> if (WARN_ON(job_read(pfdev, JS_COMMAND_NEXT(js))))
> goto end;
>
> + cfg = panfrost_mmu_as_get(pfdev, &job->file_priv->mmu);
> +
> panfrost_devfreq_record_transition(pfdev, js);
> spin_lock_irqsave(&pfdev->hwaccess_lock, flags);
>
> @@ -163,8 +165,7 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
>
> /* start MMU, medium priority, cache clean/flush on end, clean/flush on
> * start */
> - /* TODO: different address spaces */
> - cfg = JS_CONFIG_THREAD_PRI(8) |
> + cfg |= JS_CONFIG_THREAD_PRI(8) |
> JS_CONFIG_START_FLUSH_CLEAN_INVALIDATE |
> JS_CONFIG_END_FLUSH_CLEAN_INVALIDATE;
>
> @@ -280,6 +281,9 @@ static void panfrost_job_cleanup(struct kref *ref)
> kvfree(job->bos);
> }
>
> + for (i = 0; i < NUM_JOB_SLOTS; i++)
> + if (job == job->pfdev->jobs[i])
> + job->pfdev->jobs[i] = NULL;
I'm a bit worried about this. As far as I can see previously the jobs
array would just contain dangling pointers - which admittedly wasn't
ideal. However do we have sufficient locks here to ensure that this
could be racing with a panfrost_job_run() on the same slot? I'm worried
that between the check and the assignment to NULL it is possible
(admittedly very unlikely) for panfrost_job_run() to assign a new
pointer which would then be clobbered.
> kfree(job);
> }
>
> @@ -377,8 +381,9 @@ static void panfrost_job_timedout(struct drm_sched_job *sched_job)
> if (dma_fence_is_signaled(job->done_fence))
> return;
>
> - dev_err(pfdev->dev, "gpu sched timeout, js=%d, status=0x%x, head=0x%x, tail=0x%x, sched_job=%p",
> + dev_err(pfdev->dev, "gpu sched timeout, js=%d, config=0x%x, status=0x%x, head=0x%x, tail=0x%x, sched_job=%p",
> js,
> + job_read(pfdev, JS_CONFIG(js)),
> job_read(pfdev, JS_STATUS(js)),
> job_read(pfdev, JS_HEAD_LO(js)),
> job_read(pfdev, JS_TAIL_LO(js)),
> @@ -448,6 +453,7 @@ static irqreturn_t panfrost_job_irq_handler(int irq, void *data)
> }
>
> if (status & JOB_INT_MASK_DONE(j)) {
> + panfrost_mmu_as_put(pfdev, &pfdev->jobs[j]->file_priv->mmu);
> panfrost_devfreq_record_transition(pfdev, j);
> dma_fence_signal(pfdev->jobs[j]->done_fence);
> }
> diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> index 2ed411f09d80..f8da7557d1be 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> @@ -1,5 +1,6 @@
> // SPDX-License-Identifier: GPL-2.0
> /* Copyright 2019 Linaro, Ltd, Rob Herring <robh@xxxxxxxxxx> */
> +#include <linux/atomic.h>
> #include <linux/bitfield.h>
> #include <linux/delay.h>
> #include <linux/dma-mapping.h>
> @@ -22,12 +23,6 @@
> #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;
> @@ -91,6 +86,9 @@ static int mmu_hw_do_operation(struct panfrost_device *pfdev, u32 as_nr,
> unsigned long flags;
> int ret;
>
> + if (as_nr < 0)
> + return 0;
> +
Do we need any synchronisation with panfrost_mmu_as_get() for this to be
reliable? As far as I can see this check can race with the assignment of
an address space. Perhaps panfrost_mmu_as_get() (or maybe
panfrost_mmu_enable) should hold mmu->lock?
> spin_lock_irqsave(&pfdev->hwaccess_lock, flags);
>
> if (op != AS_COMMAND_UNLOCK)
> @@ -107,9 +105,10 @@ static int mmu_hw_do_operation(struct panfrost_device *pfdev, u32 as_nr,
> return ret;
> }
>
> -static void panfrost_mmu_enable(struct panfrost_device *pfdev, u32 as_nr)
> +static void panfrost_mmu_enable(struct panfrost_device *pfdev, struct panfrost_mmu *mmu)
> {
> - struct io_pgtable_cfg *cfg = &pfdev->mmu->pgtbl_cfg;
> + int as_nr = mmu->as;
> + struct io_pgtable_cfg *cfg = &mmu->pgtbl_cfg;
> u64 transtab = cfg->arm_mali_lpae_cfg.transtab;
> u64 memattr = cfg->arm_mali_lpae_cfg.memattr;
>
> @@ -136,9 +135,87 @@ static void mmu_disable(struct panfrost_device *pfdev, u32 as_nr)
> write_cmd(pfdev, as_nr, AS_COMMAND_UPDATE);
> }
>
> +u32 panfrost_mmu_as_get(struct panfrost_device *pfdev, struct panfrost_mmu *mmu)
> +{
> + int as = mmu->as;
> +
> + spin_lock(&pfdev->as_lock);
> +
> + as = mmu->as;
> + if (as >= 0) {
> + int en = atomic_fetch_inc(&mmu->as_count);
> + WARN_ON(en > 2);
> +
> + list_move(&mmu->list, &pfdev->as_lru_list);
> + spin_unlock(&pfdev->as_lock);
> + if (!en)
> + panfrost_mmu_enable(pfdev, mmu);
I don't see why we need to re-enable here - if (as >= 0) then the AS
should be present on the GPU and mmu_hw_do_operation() will have been
doing any necessary MMU commands.
> + return as;
> + }
> +
> + /* Check for a free AS */
> + as = ffz(pfdev->as_alloc_mask);
> + if (!(BIT(as) & pfdev->features.as_present)) {
> + struct panfrost_mmu *lru_mmu;
> +
> + list_for_each_entry_reverse(lru_mmu, &pfdev->as_lru_list, list) {
> + if (!atomic_read(&lru_mmu->as_count))
> + break;
> + }
> + WARN_ON(!lru_mmu);
> +
> + list_del_init(&lru_mmu->list);
> + as = lru_mmu->as;
> +
> + WARN_ON(as < 0);
> + lru_mmu->as = -1;
This should be holding a lock to synchronise with the mmu_hw_do_operation().
> + }
> +
> + /* Assign the free or reclaimed AS to the */
> + mmu->as = as;
> + set_bit(as, &pfdev->as_alloc_mask);
> + atomic_set(&mmu->as_count, 1);
> + list_add(&mmu->list, &pfdev->as_lru_list);
> +
> + dev_dbg(pfdev->dev, "Assigned AS%d to mmu %p, alloc_mask=%lx", as, mmu, pfdev->as_alloc_mask);
> +
> + spin_unlock(&pfdev->as_lock);
> +
> + panfrost_mmu_enable(pfdev, mmu);
> + return as;
> +}
> +
> +void panfrost_mmu_as_put(struct panfrost_device *pfdev, struct panfrost_mmu *mmu)
> +{
> + atomic_dec(&mmu->as_count);
> + WARN_ON(atomic_read(&mmu->as_count) < 0);
> +}
> +
> +static void panfrost_mmu_as_reset(struct panfrost_device *pfdev, struct panfrost_mmu *mmu)
> +{
> + spin_lock(&pfdev->as_lock);
> +
> + atomic_set(&mmu->as_count, 0);
> + if (mmu->as >= 0) {
> + clear_bit(mmu->as, &pfdev->as_alloc_mask);
> + list_del_init(&mmu->list);
> + mmu->as = -1;
> + }
> +
> + spin_unlock(&pfdev->as_lock);
> +}
> +
> void panfrost_mmu_reset(struct panfrost_device *pfdev)
> {
> - panfrost_mmu_enable(pfdev, 0);
> + struct drm_file *file;
> +
> + mutex_lock(&pfdev->ddev->filelist_mutex);
> + list_for_each_entry(file, &pfdev->ddev->filelist, lhead) {
> + struct panfrost_file_priv *priv = file->driver_priv;
> +
> + panfrost_mmu_as_reset(pfdev, &priv->mmu);
> + }
> + mutex_unlock(&pfdev->ddev->filelist_mutex);
>
> mmu_write(pfdev, MMU_INT_CLEAR, ~0);
> mmu_write(pfdev, MMU_INT_MASK, ~0);
> @@ -152,21 +229,21 @@ static size_t get_pgsize(u64 addr, size_t size)
> return SZ_2M;
> }
>
> -static int mmu_map_sg(struct panfrost_device *pfdev, u64 iova,
> - int prot, struct sg_table *sgt)
> +static int mmu_map_sg(struct panfrost_device *pfdev, struct panfrost_mmu *mmu,
> + u64 iova, int prot, struct sg_table *sgt)
> {
> unsigned int count;
> struct scatterlist *sgl;
> - struct io_pgtable_ops *ops = pfdev->mmu->pgtbl_ops;
> + struct io_pgtable_ops *ops = mmu->pgtbl_ops;
> u64 start_iova = iova;
>
> - mutex_lock(&pfdev->mmu->lock);
> + mutex_lock(&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);
> + dev_dbg(pfdev->dev, "map: as=%d, iova=%llx, paddr=%lx, len=%zx", mmu->as, iova, paddr, len);
>
> while (len) {
> size_t pgsize = get_pgsize(iova | paddr, len);
> @@ -178,10 +255,10 @@ static int mmu_map_sg(struct panfrost_device *pfdev, u64 iova,
> }
> }
>
> - mmu_hw_do_operation(pfdev, 0, start_iova, iova - start_iova,
> + mmu_hw_do_operation(pfdev, mmu->as, start_iova, iova - start_iova,
> AS_COMMAND_FLUSH_PT);
>
> - mutex_unlock(&pfdev->mmu->lock);
> + mutex_unlock(&mmu->lock);
>
> return 0;
> }
> @@ -208,7 +285,7 @@ int panfrost_mmu_map(struct panfrost_gem_object *bo)
> if (ret < 0)
> return ret;
>
> - mmu_map_sg(pfdev, bo->node.start << PAGE_SHIFT, prot, sgt);
> + mmu_map_sg(pfdev, bo->mmu, bo->node.start << PAGE_SHIFT, prot, sgt);
>
> pm_runtime_mark_last_busy(pfdev->dev);
> pm_runtime_put_autosuspend(pfdev->dev);
> @@ -221,7 +298,7 @@ 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;
> + struct io_pgtable_ops *ops = bo->mmu->pgtbl_ops;
> u64 iova = bo->node.start << PAGE_SHIFT;
> size_t len = bo->node.size << PAGE_SHIFT;
> size_t unmapped_len = 0;
> @@ -230,13 +307,13 @@ void panfrost_mmu_unmap(struct panfrost_gem_object *bo)
> if (WARN_ON(!bo->is_mapped))
> return;
>
> - dev_dbg(pfdev->dev, "unmap: iova=%llx, len=%zx", iova, len);
> + dev_dbg(pfdev->dev, "unmap: as=%d, iova=%llx, len=%zx", bo->mmu->as, iova, len);
>
> ret = pm_runtime_get_sync(pfdev->dev);
> if (ret < 0)
> return;
>
> - mutex_lock(&pfdev->mmu->lock);
> + mutex_lock(&bo->mmu->lock);
>
> while (unmapped_len < len) {
> size_t unmapped_page;
> @@ -250,10 +327,10 @@ void panfrost_mmu_unmap(struct panfrost_gem_object *bo)
> unmapped_len += pgsize;
> }
>
> - mmu_hw_do_operation(pfdev, 0, bo->node.start << PAGE_SHIFT,
> + mmu_hw_do_operation(pfdev, bo->mmu->as, bo->node.start << PAGE_SHIFT,
> bo->node.size << PAGE_SHIFT, AS_COMMAND_FLUSH_PT);
>
> - mutex_unlock(&pfdev->mmu->lock);
> + mutex_unlock(&bo->mmu->lock);
>
> pm_runtime_mark_last_busy(pfdev->dev);
> pm_runtime_put_autosuspend(pfdev->dev);
> @@ -262,9 +339,10 @@ void panfrost_mmu_unmap(struct panfrost_gem_object *bo)
>
> static void mmu_tlb_inv_context_s1(void *cookie)
> {
> - struct panfrost_device *pfdev = cookie;
> + struct panfrost_file_priv *priv = cookie;
>
> - mmu_hw_do_operation(pfdev, 0, 0, ~0UL, AS_COMMAND_FLUSH_MEM);
> + /* Only flush if we have an assigned AS */
I'm not sure if this comment makes sense here - seems like it belongs in
mmu_hw_do_operation()
> + mmu_hw_do_operation(priv->pfdev, priv->mmu.as, 0, ~0UL, AS_COMMAND_FLUSH_MEM);
> }
>
> static void mmu_tlb_inv_range_nosync(unsigned long iova, size_t size,
> @@ -283,16 +361,69 @@ static const struct iommu_gather_ops mmu_tlb_ops = {
> .tlb_sync = mmu_tlb_sync_context,
> };
>
> +int panfrost_mmu_pgtable_alloc(struct panfrost_file_priv *priv)
> +{
> + struct panfrost_mmu *mmu = &priv->mmu;
> + struct panfrost_device *pfdev = priv->pfdev;
> +
> + mutex_init(&mmu->lock);
> + 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),
> + .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) {
> + 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 drm_mm_node *addr_to_drm_mm_node(struct panfrost_device *pfdev, int as, u64 addr)
> {
> - struct drm_mm_node *node;
> + struct drm_mm_node *node = NULL;
> u64 offset = addr >> PAGE_SHIFT;
> + struct drm_file *file;
>
> - drm_mm_for_each_node(node, &pfdev->mm) {
> - if (offset >= node->start && offset < (node->start + node->size))
> - return node;
> + mutex_lock(&pfdev->ddev->filelist_mutex);
> + list_for_each_entry(file, &pfdev->ddev->filelist, lhead) {
You could walk as_lru_list rather than every file as you know you are
looking for a fd which is assigned an address space.
> + struct panfrost_file_priv *priv = file->driver_priv;
> +
> + if (as != priv->mmu.as)
> + continue;
> +
> + drm_mm_for_each_node(node, &priv->mm) {
> + if (offset >= node->start && offset < (node->start + node->size))
> + goto out;
> + }
> }
> - return NULL;
> +
> +out:
> + mutex_unlock(&pfdev->ddev->filelist_mutex);
> + return node;
> }
>
> #define NUM_FAULT_PAGES (SZ_2M / PAGE_SIZE)
> @@ -317,6 +448,8 @@ int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as, u64 addr)
> node->start << PAGE_SHIFT);
> return -EINVAL;
> }
> + WARN_ON(bo->mmu->as == -1);
You could strengthen this to WARN_ON(bo->mmu->as != as)
> +
> /* Assume 2MB alignment and size multiple */
> addr &= ~((u64)SZ_2M - 1);
> page_offset = addr >> PAGE_SHIFT;
> @@ -367,11 +500,11 @@ int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as, u64 addr)
> goto err_map;
> }
>
> - mmu_map_sg(pfdev, addr, IOMMU_WRITE | IOMMU_READ | IOMMU_NOEXEC, sgt);
> + mmu_map_sg(pfdev, bo->mmu, addr, IOMMU_WRITE | IOMMU_READ | IOMMU_NOEXEC, sgt);
>
> bo->is_mapped = true;
>
> - dev_dbg(pfdev->dev, "mapped page fault @ %llx", addr);
> + dev_dbg(pfdev->dev, "mapped page fault @ AS%d %llx", bo->mmu->as, addr);
Assuming the above WARN_ON strengthing then: s/bo->mmu->as/as/
Steve
>
> return 0;
>
> @@ -480,15 +613,8 @@ static irqreturn_t panfrost_mmu_irq_handler_thread(int irq, void *data)
>
> 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;
> @@ -501,22 +627,6 @@ int panfrost_mmu_init(struct panfrost_device *pfdev)
> dev_err(pfdev->dev, "failed to request mmu irq");
> return err;
> }
> - 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;
> }
> @@ -525,6 +635,4 @@ 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);
> }
> diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.h b/drivers/gpu/drm/panfrost/panfrost_mmu.h
> index d5f9b24537db..7c5b6775ae23 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_mmu.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.h
> @@ -5,6 +5,8 @@
> #define __PANFROST_MMU_H__
>
> struct panfrost_gem_object;
> +struct panfrost_file_priv;
> +struct panfrost_mmu;
>
> int panfrost_mmu_map(struct panfrost_gem_object *bo);
> void panfrost_mmu_unmap(struct panfrost_gem_object *bo);
> @@ -13,4 +15,10 @@ int panfrost_mmu_init(struct panfrost_device *pfdev);
> void panfrost_mmu_fini(struct panfrost_device *pfdev);
> void panfrost_mmu_reset(struct panfrost_device *pfdev);
>
> +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);
> +
> #endif
>
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