From 50261151a13176a99ee6117dbbb2e557fd0b608b Mon Sep 17 00:00:00 2001 From: =?utf8?q?Nils=20Wallm=C3=A9nius?= Date: Mon, 16 Jan 2017 21:56:48 +0100 Subject: [PATCH] drm/amdgpu: simplify allocation of scratch regs MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The scratch regs are sequential so there's no need to keep them in an array, we can just return the index of the first free register + the base register. Also change the array of bools for keeping track of the free regs to a bitfield. Reviewed-by: Christian König Signed-off-by: Nils Wallménius Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu.h | 3 +-- drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c | 21 +++++++-------------- drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c | 7 +------ drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c | 7 +------ drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c | 7 +------ 5 files changed, 11 insertions(+), 34 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h index ffeda245f38b..953148058bdb 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h @@ -794,8 +794,7 @@ struct amdgpu_kiq { struct amdgpu_scratch { unsigned num_reg; uint32_t reg_base; - bool free[32]; - uint32_t reg[32]; + uint32_t free_mask; }; /* diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c index 01a42b6a69a4..19943356cca7 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c @@ -42,12 +42,12 @@ int amdgpu_gfx_scratch_get(struct amdgpu_device *adev, uint32_t *reg) { int i; - for (i = 0; i < adev->gfx.scratch.num_reg; i++) { - if (adev->gfx.scratch.free[i]) { - adev->gfx.scratch.free[i] = false; - *reg = adev->gfx.scratch.reg[i]; - return 0; - } + i = ffs(adev->gfx.scratch.free_mask); + if (i != 0 && i <= adev->gfx.scratch.num_reg) { + i--; + adev->gfx.scratch.free_mask &= ~(1u << i); + *reg = adev->gfx.scratch.reg_base + i; + return 0; } return -EINVAL; } @@ -62,14 +62,7 @@ int amdgpu_gfx_scratch_get(struct amdgpu_device *adev, uint32_t *reg) */ void amdgpu_gfx_scratch_free(struct amdgpu_device *adev, uint32_t reg) { - int i; - - for (i = 0; i < adev->gfx.scratch.num_reg; i++) { - if (adev->gfx.scratch.reg[i] == reg) { - adev->gfx.scratch.free[i] = true; - return; - } - } + adev->gfx.scratch.free_mask |= 1u << (reg - adev->gfx.scratch.reg_base); } /** diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c index b323f5ef64d2..e0132436c76f 100644 --- a/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c @@ -1794,14 +1794,9 @@ static void gfx_v6_0_gpu_init(struct amdgpu_device *adev) static void gfx_v6_0_scratch_init(struct amdgpu_device *adev) { - int i; - adev->gfx.scratch.num_reg = 7; adev->gfx.scratch.reg_base = mmSCRATCH_REG0; - for (i = 0; i < adev->gfx.scratch.num_reg; i++) { - adev->gfx.scratch.free[i] = true; - adev->gfx.scratch.reg[i] = adev->gfx.scratch.reg_base + i; - } + adev->gfx.scratch.free_mask = (1u << adev->gfx.scratch.num_reg) - 1; } static int gfx_v6_0_ring_test_ring(struct amdgpu_ring *ring) diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c index c4e14015ec5b..cfed6db69b93 100644 --- a/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c @@ -2003,14 +2003,9 @@ static void gfx_v7_0_gpu_init(struct amdgpu_device *adev) */ static void gfx_v7_0_scratch_init(struct amdgpu_device *adev) { - int i; - adev->gfx.scratch.num_reg = 7; adev->gfx.scratch.reg_base = mmSCRATCH_REG0; - for (i = 0; i < adev->gfx.scratch.num_reg; i++) { - adev->gfx.scratch.free[i] = true; - adev->gfx.scratch.reg[i] = adev->gfx.scratch.reg_base + i; - } + adev->gfx.scratch.free_mask = (1u << adev->gfx.scratch.num_reg) - 1; } /** diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c index c8c45ba952c8..69543d4eef34 100644 --- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c @@ -749,14 +749,9 @@ static void gfx_v8_0_init_golden_registers(struct amdgpu_device *adev) static void gfx_v8_0_scratch_init(struct amdgpu_device *adev) { - int i; - adev->gfx.scratch.num_reg = 7; adev->gfx.scratch.reg_base = mmSCRATCH_REG0; - for (i = 0; i < adev->gfx.scratch.num_reg; i++) { - adev->gfx.scratch.free[i] = true; - adev->gfx.scratch.reg[i] = adev->gfx.scratch.reg_base + i; - } + adev->gfx.scratch.free_mask = (1u << adev->gfx.scratch.num_reg) - 1; } static int gfx_v8_0_ring_test_ring(struct amdgpu_ring *ring) -- 2.20.1