/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 *
 * (C) COPYRIGHT 2018, 2020-2022 ARM Limited. All rights reserved.
 *
 * This program is free software and is provided to you under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation, and any use by you of this program is subject to the terms
 * of such GNU license.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you can access it online at
 * http://www.gnu.org/licenses/gpl-2.0.html.
 *
 */

#ifndef _KBASE_HWCNT_GPU_H_
#define _KBASE_HWCNT_GPU_H_

#include <linux/bug.h>
#include <linux/types.h>

struct kbase_device;
struct kbase_hwcnt_metadata;
struct kbase_hwcnt_enable_map;
struct kbase_hwcnt_dump_buffer;

/* Hardware counter version 5 definitions, V5 is the only supported version. */
#define KBASE_HWCNT_V5_BLOCK_TYPE_COUNT 4
#define KBASE_HWCNT_V5_HEADERS_PER_BLOCK 4
#define KBASE_HWCNT_V5_DEFAULT_COUNTERS_PER_BLOCK 60
#define KBASE_HWCNT_V5_DEFAULT_VALUES_PER_BLOCK                                \
	(KBASE_HWCNT_V5_HEADERS_PER_BLOCK +                                    \
	 KBASE_HWCNT_V5_DEFAULT_COUNTERS_PER_BLOCK)

/* FrontEnd block count in V5 GPU hardware counter. */
#define KBASE_HWCNT_V5_FE_BLOCK_COUNT 1
/* Tiler block count in V5 GPU hardware counter. */
#define KBASE_HWCNT_V5_TILER_BLOCK_COUNT 1

/* Index of the PRFCNT_EN header into a V5 counter block */
#define KBASE_HWCNT_V5_PRFCNT_EN_HEADER 2

/* Number of bytes for each counter value in hardware. */
#define KBASE_HWCNT_VALUE_HW_BYTES (sizeof(u32))

/**
 * enum kbase_hwcnt_gpu_group_type - GPU hardware counter group types, used to
 *                                   identify metadata groups.
 * @KBASE_HWCNT_GPU_GROUP_TYPE_V5: GPU V5 group type.
 */
enum kbase_hwcnt_gpu_group_type {
	KBASE_HWCNT_GPU_GROUP_TYPE_V5,
};

/**
 * enum kbase_hwcnt_gpu_v5_block_type - GPU V5 hardware counter block types,
 *                                      used to identify metadata blocks.
 * @KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_FE:        Front End block (Job manager
 *                                                or CSF HW).
 * @KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_FE2:       Secondary Front End block (Job
 *                                                manager or CSF HW).
 * @KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_FE3:       Tertiary Front End block (Job
 *                                                manager or CSF HW).
 * @KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_FE_UNDEFINED: Undefined Front End block
 *                                                   (e.g. if a counter set that
 *                                                   a block doesn't support is
 *                                                   used).
 * @KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_TILER:     Tiler block.
 * @KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_TILER_UNDEFINED: Undefined Tiler block.
 * @KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_SC:        Shader Core block.
 * @KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_SC2:       Secondary Shader Core block.
 * @KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_SC3:       Tertiary Shader Core block.
 * @KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_SC_UNDEFINED: Undefined Shader Core block.
 * @KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_MEMSYS:    Memsys block.
 * @KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_MEMSYS2:   Secondary Memsys block.
 * @KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_MEMSYS_UNDEFINED: Undefined Memsys block.
 */
enum kbase_hwcnt_gpu_v5_block_type {
	KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_FE,
	KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_FE2,
	KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_FE3,
	KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_FE_UNDEFINED,
	KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_TILER,
	KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_TILER_UNDEFINED,
	KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_SC,
	KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_SC2,
	KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_SC3,
	KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_SC_UNDEFINED,
	KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_MEMSYS,
	KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_MEMSYS2,
	KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_MEMSYS_UNDEFINED,
};

/**
 * enum kbase_hwcnt_set - GPU hardware counter sets
 * @KBASE_HWCNT_SET_PRIMARY:   The Primary set of counters
 * @KBASE_HWCNT_SET_SECONDARY: The Secondary set of counters
 * @KBASE_HWCNT_SET_TERTIARY:  The Tertiary set of counters
 * @KBASE_HWCNT_SET_UNDEFINED: Undefined set of counters
 */
enum kbase_hwcnt_set {
	KBASE_HWCNT_SET_PRIMARY,
	KBASE_HWCNT_SET_SECONDARY,
	KBASE_HWCNT_SET_TERTIARY,
	KBASE_HWCNT_SET_UNDEFINED = 255,
};

/**
 * struct kbase_hwcnt_physical_enable_map - Representation of enable map
 *                                          directly used by GPU.
 * @fe_bm:     Front end (JM/CSHW) counters selection bitmask.
 * @shader_bm: Shader counters selection bitmask.
 * @tiler_bm:  Tiler counters selection bitmask.
 * @mmu_l2_bm: MMU_L2 counters selection bitmask.
 */
struct kbase_hwcnt_physical_enable_map {
	u32 fe_bm;
	u32 shader_bm;
	u32 tiler_bm;
	u32 mmu_l2_bm;
};

/*
 * Values for Hardware Counter SET_SELECT value.
 * Directly passed to HW.
 */
enum kbase_hwcnt_physical_set {
	KBASE_HWCNT_PHYSICAL_SET_PRIMARY = 0,
	KBASE_HWCNT_PHYSICAL_SET_SECONDARY = 1,
	KBASE_HWCNT_PHYSICAL_SET_TERTIARY = 2,
};

/**
 * struct kbase_hwcnt_gpu_info - Information about hwcnt blocks on the GPUs.
 * @l2_count:                L2 cache count.
 * @core_mask:               Shader core mask. May be sparse.
 * @clk_cnt:                 Number of clock domains available.
 * @prfcnt_values_per_block: Total entries (header + counters) of performance
 *                           counter per block.
 */
struct kbase_hwcnt_gpu_info {
	size_t l2_count;
	u64 core_mask;
	u8 clk_cnt;
	size_t prfcnt_values_per_block;
};

/**
 * struct kbase_hwcnt_curr_config - Current Configuration of HW allocated to the
 *                                  GPU.
 * @num_l2_slices:  Current number of L2 slices allocated to the GPU.
 * @shader_present: Current shader present bitmap that is allocated to the GPU.
 *
 * For architectures with the max_config interface available from the Arbiter,
 * the current resources allocated may change during runtime due to a
 * re-partitioning (possible with partition manager). Thus, the HWC needs to be
 * prepared to report any possible set of counters. For this reason the memory
 * layout in the userspace is based on the maximum possible allocation. On the
 * other hand, each partition has just the view of its currently allocated
 * resources. Therefore, it is necessary to correctly map the dumped HWC values
 * from the registers into this maximum memory layout so that it can be exposed
 * to the userspace side correctly.
 *
 * For L2 cache just the number is enough once the allocated ones will be
 * accumulated on the first L2 slots available in the destination buffer.
 *
 * For the correct mapping of the shader cores it is necessary to jump all the
 * L2 cache slots in the destination buffer that are not allocated. But, it is
 * not necessary to add any logic to map the shader cores bitmap into the memory
 * layout because the shader_present allocated will always be a subset of the
 * maximum shader_present. It is possible because:
 * 1 - Partitions are made of slices and they are always ordered from the ones
 *     with more shader cores to the ones with less.
 * 2 - The shader cores in a slice are always contiguous.
 * 3 - A partition can only have a contiguous set of slices allocated to it.
 * So, for example, if 4 slices are available in total, 1 with 4 cores, 2 with
 * 3 cores and 1 with 2 cores. The maximum possible shader_present would be:
 * 0x0011|0111|0111|1111 -> note the order and that the shader cores are
 *                          contiguous in any slice.
 * Supposing that a partition takes the two slices in the middle, the current
 * config shader_present for this partition would be:
 * 0x0111|0111 -> note that this is a subset of the maximum above and the slices
 *                are contiguous.
 * Therefore, by directly copying any subset of the maximum possible
 * shader_present the mapping is already achieved.
 */
struct kbase_hwcnt_curr_config {
	size_t num_l2_slices;
	u64 shader_present;
};

/**
 * kbase_hwcnt_is_block_type_undefined() - Check if a block type is undefined.
 *
 * @grp_type: Hardware counter group type.
 * @blk_type: Hardware counter block type.
 *
 * Return: true if the block type is undefined, else false.
 */
static inline bool kbase_hwcnt_is_block_type_undefined(const uint64_t grp_type,
						       const uint64_t blk_type)
{
	/* Warn on unknown group type */
	if (WARN_ON(grp_type != KBASE_HWCNT_GPU_GROUP_TYPE_V5))
		return false;

	return (blk_type == KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_FE_UNDEFINED ||
		blk_type == KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_TILER_UNDEFINED ||
		blk_type == KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_SC_UNDEFINED ||
		blk_type == KBASE_HWCNT_GPU_V5_BLOCK_TYPE_PERF_MEMSYS_UNDEFINED);
}

/**
 * kbase_hwcnt_jm_metadata_create() - Create hardware counter metadata for the
 *                                    JM GPUs.
 * @info:           Non-NULL pointer to info struct.
 * @counter_set:    The performance counter set used.
 * @out_metadata:   Non-NULL pointer to where created metadata is stored on
 *                  success.
 * @out_dump_bytes: Non-NULL pointer to where the size of the GPU counter dump
 *                  buffer is stored on success.
 *
 * Return: 0 on success, else error code.
 */
int kbase_hwcnt_jm_metadata_create(
	const struct kbase_hwcnt_gpu_info *info,
	enum kbase_hwcnt_set counter_set,
	const struct kbase_hwcnt_metadata **out_metadata,
	size_t *out_dump_bytes);

/**
 * kbase_hwcnt_jm_metadata_destroy() - Destroy JM GPU hardware counter metadata.
 *
 * @metadata: Pointer to metadata to destroy.
 */
void kbase_hwcnt_jm_metadata_destroy(
	const struct kbase_hwcnt_metadata *metadata);

/**
 * kbase_hwcnt_csf_metadata_create() - Create hardware counter metadata for the
 *                                     CSF GPUs.
 * @info:           Non-NULL pointer to info struct.
 * @counter_set:    The performance counter set used.
 * @out_metadata:   Non-NULL pointer to where created metadata is stored on
 *                  success.
 *
 * Return: 0 on success, else error code.
 */
int kbase_hwcnt_csf_metadata_create(
	const struct kbase_hwcnt_gpu_info *info,
	enum kbase_hwcnt_set counter_set,
	const struct kbase_hwcnt_metadata **out_metadata);

/**
 * kbase_hwcnt_csf_metadata_destroy() - Destroy CSF GPU hardware counter
 *                                      metadata.
 * @metadata: Pointer to metadata to destroy.
 */
void kbase_hwcnt_csf_metadata_destroy(
	const struct kbase_hwcnt_metadata *metadata);

/**
 * kbase_hwcnt_jm_dump_get() - Copy or accumulate enabled counters from the raw
 *                             dump buffer in src into the dump buffer
 *                             abstraction in dst.
 * @dst:            Non-NULL pointer to destination dump buffer.
 * @src:            Non-NULL pointer to source raw dump buffer, of same length
 *                  as dump_buf_bytes in the metadata of destination dump
 *                  buffer.
 * @dst_enable_map: Non-NULL pointer to enable map specifying enabled values.
 * @pm_core_mask:   PM state synchronized shaders core mask with the dump.
 * @curr_config:    Current allocated hardware resources to correctly map the
 *                  source raw dump buffer to the destination dump buffer.
 * @accumulate:     True if counters in source should be accumulated into
 *                  destination, rather than copied.
 *
 * The dst and dst_enable_map MUST have been created from the same metadata as
 * returned from the call to kbase_hwcnt_jm_metadata_create as was used to get
 * the length of src.
 *
 * Return: 0 on success, else error code.
 */
int kbase_hwcnt_jm_dump_get(struct kbase_hwcnt_dump_buffer *dst, u64 *src,
			    const struct kbase_hwcnt_enable_map *dst_enable_map,
			    const u64 pm_core_mask,
			    const struct kbase_hwcnt_curr_config *curr_config,
			    bool accumulate);

/**
 * kbase_hwcnt_csf_dump_get() - Copy or accumulate enabled counters from the raw
 *                              dump buffer in src into the dump buffer
 *                              abstraction in dst.
 * @dst:            Non-NULL pointer to destination dump buffer.
 * @src:            Non-NULL pointer to source raw dump buffer, of same length
 *                  as dump_buf_bytes in the metadata of dst dump buffer.
 * @dst_enable_map: Non-NULL pointer to enable map specifying enabled values.
 * @accumulate:     True if counters in src should be accumulated into
 *                  destination, rather than copied.
 *
 * The dst and dst_enable_map MUST have been created from the same metadata as
 * returned from the call to kbase_hwcnt_csf_metadata_create as was used to get
 * the length of src.
 *
 * Return: 0 on success, else error code.
 */
int kbase_hwcnt_csf_dump_get(struct kbase_hwcnt_dump_buffer *dst, u64 *src,
			     const struct kbase_hwcnt_enable_map *dst_enable_map,
			     bool accumulate);

/**
 * kbase_hwcnt_backend_gpu_block_map_to_physical() - Convert from a block
 *                                                   enable map abstraction to
 *                                                   a physical block enable
 *                                                   map.
 * @lo: Low 64 bits of block enable map abstraction.
 * @hi: High 64 bits of block enable map abstraction.
 *
 * The abstraction uses 128 bits to enable 128 block values, whereas the
 * physical uses just 32 bits, as bit n enables values [n*4, n*4+3].
 * Therefore, this conversion is lossy.
 *
 * Return: 32-bit physical block enable map.
 */
static inline u32 kbase_hwcnt_backend_gpu_block_map_to_physical(u64 lo, u64 hi)
{
	u32 phys = 0;
	u64 dwords[2] = { lo, hi };
	size_t dword_idx;

	for (dword_idx = 0; dword_idx < 2; dword_idx++) {
		const u64 dword = dwords[dword_idx];
		u16 packed = 0;

		size_t hword_bit;

		for (hword_bit = 0; hword_bit < 16; hword_bit++) {
			const size_t dword_bit = hword_bit * 4;
			const u16 mask = ((dword >> (dword_bit + 0)) & 0x1) |
					 ((dword >> (dword_bit + 1)) & 0x1) |
					 ((dword >> (dword_bit + 2)) & 0x1) |
					 ((dword >> (dword_bit + 3)) & 0x1);
			packed |= (mask << hword_bit);
		}
		phys |= ((u32)packed) << (16 * dword_idx);
	}
	return phys;
}

/**
 * kbase_hwcnt_gpu_enable_map_to_physical() - Convert an enable map abstraction
 *                                            into a physical enable map.
 * @dst: Non-NULL pointer to destination physical enable map.
 * @src: Non-NULL pointer to source enable map abstraction.
 *
 * The src must have been created from a metadata returned from a call to
 * kbase_hwcnt_jm_metadata_create or kbase_hwcnt_csf_metadata_create.
 *
 * This is a lossy conversion, as the enable map abstraction has one bit per
 * individual counter block value, but the physical enable map uses 1 bit for
 * every 4 counters, shared over all instances of a block.
 */
void kbase_hwcnt_gpu_enable_map_to_physical(
	struct kbase_hwcnt_physical_enable_map *dst,
	const struct kbase_hwcnt_enable_map *src);

/**
 * kbase_hwcnt_gpu_set_to_physical() - Map counter set selection to physical
 *                                     SET_SELECT value.
 *
 * @dst: Non-NULL pointer to destination physical SET_SELECT value.
 * @src: Non-NULL pointer to source counter set selection.
 */
void kbase_hwcnt_gpu_set_to_physical(enum kbase_hwcnt_physical_set *dst,
				     enum kbase_hwcnt_set src);

/**
 * kbase_hwcnt_gpu_enable_map_from_physical() - Convert a physical enable map to
 *                                              an enable map abstraction.
 * @dst: Non-NULL pointer to destination enable map abstraction.
 * @src: Non-NULL pointer to source physical enable map.
 *
 * The dst must have been created from a metadata returned from a call to
 * kbase_hwcnt_jm_metadata_create or kbase_hwcnt_csf_metadata_create.
 *
 * This is a lossy conversion, as the physical enable map can technically
 * support counter blocks with 128 counters each, but no hardware actually uses
 * more than 64, so the enable map abstraction has nowhere to store the enable
 * information for the 64 non-existent counters.
 */
void kbase_hwcnt_gpu_enable_map_from_physical(
	struct kbase_hwcnt_enable_map *dst,
	const struct kbase_hwcnt_physical_enable_map *src);

/**
 * kbase_hwcnt_gpu_patch_dump_headers() - Patch all the performance counter
 *                                        enable headers in a dump buffer to
 *                                        reflect the specified enable map.
 * @buf:        Non-NULL pointer to dump buffer to patch.
 * @enable_map: Non-NULL pointer to enable map.
 *
 * The buf and enable_map must have been created from a metadata returned from
 * a call to kbase_hwcnt_jm_metadata_create or kbase_hwcnt_csf_metadata_create.
 *
 * This function should be used before handing off a dump buffer over the
 * kernel-user boundary, to ensure the header is accurate for the enable map
 * used by the user.
 */
void kbase_hwcnt_gpu_patch_dump_headers(
	struct kbase_hwcnt_dump_buffer *buf,
	const struct kbase_hwcnt_enable_map *enable_map);

#endif /* _KBASE_HWCNT_GPU_H_ */