diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c')
-rw-r--r-- | drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c | 59 |
1 files changed, 38 insertions, 21 deletions
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c b/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c index acf4d2a977ad..ebb4da14e3df 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c @@ -24,16 +24,15 @@ #include <linux/mman.h> #include <linux/slab.h> #include <linux/io.h> +#include <linux/idr.h> /* - * 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()); @@ -114,8 +116,7 @@ int kfd_doorbell_init(struct kfd_dev *kfd) pr_debug("doorbell aperture size == 0x%08lX\n", kfd->shared_resources.doorbell_aperture_size); - pr_debug("doorbell kernel address == 0x%08lX\n", - (uintptr_t)kfd->doorbell_kernel_ptr); + pr_debug("doorbell kernel address == %p\n", kfd->doorbell_kernel_ptr); return 0; } @@ -185,16 +186,15 @@ 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" - " kernel address == 0x%08lX\n", - *doorbell_off, (uintptr_t)(kfd->doorbell_kernel_ptr + inx)); + " kernel address == %p\n", + *doorbell_off, (kfd->doorbell_kernel_ptr + inx)); return kfd->doorbell_kernel_ptr + inx; } @@ -214,7 +214,7 @@ inline void write_kernel_doorbell(u32 __iomem *db, u32 value) { if (db) { writel(value, db); - pr_debug("Writing %d to doorbell address 0x%p\n", value, db); + pr_debug("Writing %d to doorbell address %p\n", value, db); } } @@ -228,11 +228,12 @@ 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 +251,21 @@ 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); } |