From: Felix Kuehling Date: Sat, 26 Aug 2017 06:00:57 +0000 (-0400) Subject: drm/amdkfd: Separate doorbell allocation from PASID X-Git-Tag: v4.19~2077^2~60^2~66 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a91e70e30c3e1aaf90ddb851f9736367bc885fb8;p=platform%2Fkernel%2Flinux-rpi3.git drm/amdkfd: Separate doorbell allocation from PASID PASID management is moving into KGD. Limiting the PASID range to the number of doorbell pages is no longer practical. Signed-off-by: Felix Kuehling Acked-by: Alex Deucher Reviewed-by: Oded Gabbay Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c b/drivers/gpu/drm/amd/amdkfd/kfd_device.c index 61fff25..5df12b2 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c @@ -168,13 +168,6 @@ static bool device_iommu_pasid_init(struct kfd_dev *kfd) pasid_limit = min_t(unsigned int, (unsigned int)(1 << kfd->device_info->max_pasid_bits), iommu_info.max_pasids); - /* - * last pasid is used for kernel queues doorbells - * in the future the last pasid might be used for a kernel thread. - */ - pasid_limit = min_t(unsigned int, - pasid_limit, - kfd->doorbell_process_limit - 1); err = amd_iommu_init_device(kfd->pdev, pasid_limit); if (err < 0) { diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c b/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c index acf4d2a..feb76c2 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c @@ -24,16 +24,15 @@ #include #include #include +#include /* - * This extension supports a kernel level doorbells management for - * the kernel queues. - * Basically the last doorbells page is devoted to kernel queues - * and that's assures that any user process won't get access to the - * kernel doorbells page + * This extension supports a kernel level doorbells management for the + * kernel queues using the first doorbell page reserved for the kernel. */ -#define KERNEL_DOORBELL_PASID 1 +static DEFINE_IDA(doorbell_ida); +static unsigned int max_doorbell_slices; #define KFD_SIZE_OF_DOORBELL_IN_BYTES 4 /* @@ -84,13 +83,16 @@ int kfd_doorbell_init(struct kfd_dev *kfd) (doorbell_aperture_size - doorbell_start_offset) / doorbell_process_allocation(); else - doorbell_process_limit = 0; + return -ENOSPC; + + if (!max_doorbell_slices || + doorbell_process_limit < max_doorbell_slices) + max_doorbell_slices = doorbell_process_limit; kfd->doorbell_base = kfd->shared_resources.doorbell_physical_address + doorbell_start_offset; kfd->doorbell_id_offset = doorbell_start_offset / sizeof(u32); - kfd->doorbell_process_limit = doorbell_process_limit - 1; kfd->doorbell_kernel_ptr = ioremap(kfd->doorbell_base, doorbell_process_allocation()); @@ -185,11 +187,10 @@ u32 __iomem *kfd_get_kernel_doorbell(struct kfd_dev *kfd, return NULL; /* - * Calculating the kernel doorbell offset using "faked" kernel - * pasid that allocated for kernel queues only + * Calculating the kernel doorbell offset using the first + * doorbell page. */ - *doorbell_off = KERNEL_DOORBELL_PASID * (doorbell_process_allocation() / - sizeof(u32)) + inx; + *doorbell_off = kfd->doorbell_id_offset + inx; pr_debug("Get kernel queue doorbell\n" " doorbell offset == 0x%08X\n" @@ -228,11 +229,12 @@ unsigned int kfd_queue_id_to_doorbell(struct kfd_dev *kfd, { /* * doorbell_id_offset accounts for doorbells taken by KGD. - * pasid * doorbell_process_allocation/sizeof(u32) adjusts - * to the process's doorbells + * index * doorbell_process_allocation/sizeof(u32) adjusts to + * the process's doorbells. */ return kfd->doorbell_id_offset + - process->pasid * (doorbell_process_allocation()/sizeof(u32)) + + process->doorbell_index + * doorbell_process_allocation() / sizeof(u32) + queue_id; } @@ -250,5 +252,21 @@ phys_addr_t kfd_get_process_doorbells(struct kfd_dev *dev, struct kfd_process *process) { return dev->doorbell_base + - process->pasid * doorbell_process_allocation(); + process->doorbell_index * doorbell_process_allocation(); +} + +int kfd_alloc_process_doorbells(struct kfd_process *process) +{ + int r = ida_simple_get(&doorbell_ida, 1, max_doorbell_slices, + GFP_KERNEL); + if (r > 0) + process->doorbell_index = r; + + return r; +} + +void kfd_free_process_doorbells(struct kfd_process *process) +{ + if (process->doorbell_index) + ida_simple_remove(&doorbell_ida, process->doorbell_index); } diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h index b397ec7..4cb90f5 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h +++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h @@ -157,9 +157,6 @@ struct kfd_dev { * to HW doorbell, GFX reserved some * at the start) */ - size_t doorbell_process_limit; /* Number of processes we have doorbell - * space for. - */ u32 __iomem *doorbell_kernel_ptr; /* This is a pointer for a doorbells * page used by kernel queue */ @@ -495,6 +492,7 @@ struct kfd_process { struct rcu_head rcu; unsigned int pasid; + unsigned int doorbell_index; /* * List of kfd_process_device structures, @@ -583,6 +581,10 @@ void write_kernel_doorbell(u32 __iomem *db, u32 value); unsigned int kfd_queue_id_to_doorbell(struct kfd_dev *kfd, struct kfd_process *process, unsigned int queue_id); +phys_addr_t kfd_get_process_doorbells(struct kfd_dev *dev, + struct kfd_process *process); +int kfd_alloc_process_doorbells(struct kfd_process *process); +void kfd_free_process_doorbells(struct kfd_process *process); /* GTT Sub-Allocator */ @@ -694,8 +696,6 @@ int pm_send_unmap_queue(struct packet_manager *pm, enum kfd_queue_type type, void pm_release_ib(struct packet_manager *pm); uint64_t kfd_get_number_elems(struct kfd_dev *kfd); -phys_addr_t kfd_get_process_doorbells(struct kfd_dev *dev, - struct kfd_process *process); /* Events */ extern const struct kfd_event_interrupt_class event_interrupt_class_cik; diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c index c74cf22..9e65ce3 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c @@ -183,6 +183,7 @@ static void kfd_process_wq_release(struct work_struct *work) kfd_event_free_process(p); kfd_pasid_free(p->pasid); + kfd_free_process_doorbells(p); mutex_unlock(&p->mutex); @@ -288,6 +289,9 @@ static struct kfd_process *create_process(const struct task_struct *thread) if (process->pasid == 0) goto err_alloc_pasid; + if (kfd_alloc_process_doorbells(process) < 0) + goto err_alloc_doorbells; + mutex_init(&process->mutex); process->mm = thread->mm; @@ -329,6 +333,8 @@ err_process_pqm_init: mmu_notifier_unregister_no_release(&process->mmu_notifier, process->mm); err_mmu_notifier: mutex_destroy(&process->mutex); + kfd_free_process_doorbells(process); +err_alloc_doorbells: kfd_pasid_free(process->pasid); err_alloc_pasid: kfree(process->queues);