From: Jamie Fox jamie.fox@arm.com

Mali-DP650 supports warming up the SMMU translations, by sending requsts to the SMMU before a buffer is read.

There are two modes supported:

- PARTIAL: could be enabled when the buffer is composed of 4K or 64K pages, the display hardware will send a configurable number of requests before the actual reading.

- FULL: could be enabled when the buffer is composed of 1M or 2M pages, the display hardware will send requests before reading for all pages composing the buffer.

This patch adds a mechanism for detecting the page size and set the MMU prefetch mode if possible.

Changes since v1: - For imported buffers use the already populated drm_gem_cma_object.sgt instead of calling driver.gem_prime_get_sg_table, which works just for buffers allocated through the gem_cma API.

Signed-off-by: Jamie Fox jamie.fox@arm.com Signed-off-by: Alexandru Gheorghe alexandru-cosmin.gheorghe@arm.com [rebased and re-ordered functions] Signed-off-by: Liviu Dudau liviu.dudau@arm.com --- drivers/gpu/drm/arm/malidp_drv.h | 8 + drivers/gpu/drm/arm/malidp_hw.c | 47 ++++-- drivers/gpu/drm/arm/malidp_hw.h | 1 + drivers/gpu/drm/arm/malidp_planes.c | 238 ++++++++++++++++++++++++++++ drivers/gpu/drm/arm/malidp_regs.h | 11 ++ 5 files changed, 296 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/arm/malidp_drv.h b/drivers/gpu/drm/arm/malidp_drv.h index e3eb0cb1f385..b76c86f18a56 100644 --- a/drivers/gpu/drm/arm/malidp_drv.h +++ b/drivers/gpu/drm/arm/malidp_drv.h @@ -55,6 +55,12 @@ struct malidp_plane { const struct malidp_layer *layer; };

+enum mmu_prefetch_mode { + MALIDP_PREFETCH_MODE_NONE, + MALIDP_PREFETCH_MODE_PARTIAL, + MALIDP_PREFETCH_MODE_FULL, +}; + struct malidp_plane_state { struct drm_plane_state base;

@@ -63,6 +69,8 @@ struct malidp_plane_state { /* internal format ID */ u8 format; u8 n_planes; + enum mmu_prefetch_mode mmu_prefetch_mode; + u32 mmu_prefetch_pgsize; };

#define to_malidp_plane(x) container_of(x, struct malidp_plane, base) diff --git a/drivers/gpu/drm/arm/malidp_hw.c b/drivers/gpu/drm/arm/malidp_hw.c index 2781e462c1ed..c874ef4ac005 100644 --- a/drivers/gpu/drm/arm/malidp_hw.c +++ b/drivers/gpu/drm/arm/malidp_hw.c @@ -84,16 +84,45 @@ static const struct malidp_format_id malidp550_de_formats[] = { };

static const struct malidp_layer malidp500_layers[] = { - { DE_VIDEO1, MALIDP500_DE_LV_BASE, MALIDP500_DE_LV_PTR_BASE, MALIDP_DE_LV_STRIDE0, MALIDP500_LV_YUV2RGB }, - { DE_GRAPHICS1, MALIDP500_DE_LG1_BASE, MALIDP500_DE_LG1_PTR_BASE, MALIDP_DE_LG_STRIDE, 0 }, - { DE_GRAPHICS2, MALIDP500_DE_LG2_BASE, MALIDP500_DE_LG2_PTR_BASE, MALIDP_DE_LG_STRIDE, 0 }, + /* id, base address, fb pointer address base, stride offset, + * yuv2rgb matrix offset, mmu control register offset + */ + { DE_VIDEO1, MALIDP500_DE_LV_BASE, MALIDP500_DE_LV_PTR_BASE, + MALIDP_DE_LV_STRIDE0, MALIDP500_LV_YUV2RGB, 0 }, + { DE_GRAPHICS1, MALIDP500_DE_LG1_BASE, MALIDP500_DE_LG1_PTR_BASE, + MALIDP_DE_LG_STRIDE, 0, 0 }, + { DE_GRAPHICS2, MALIDP500_DE_LG2_BASE, MALIDP500_DE_LG2_PTR_BASE, + MALIDP_DE_LG_STRIDE, 0, 0 }, };

static const struct malidp_layer malidp550_layers[] = { - { DE_VIDEO1, MALIDP550_DE_LV1_BASE, MALIDP550_DE_LV1_PTR_BASE, MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB }, - { DE_GRAPHICS1, MALIDP550_DE_LG_BASE, MALIDP550_DE_LG_PTR_BASE, MALIDP_DE_LG_STRIDE, 0 }, - { DE_VIDEO2, MALIDP550_DE_LV2_BASE, MALIDP550_DE_LV2_PTR_BASE, MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB }, - { DE_SMART, MALIDP550_DE_LS_BASE, MALIDP550_DE_LS_PTR_BASE, MALIDP550_DE_LS_R1_STRIDE, 0 }, + /* id, base address, fb pointer address base, stride offset, + * yuv2rgb matrix offset, mmu control register offset + */ + { DE_VIDEO1, MALIDP550_DE_LV1_BASE, MALIDP550_DE_LV1_PTR_BASE, + MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, 0 }, + { DE_GRAPHICS1, MALIDP550_DE_LG_BASE, MALIDP550_DE_LG_PTR_BASE, + MALIDP_DE_LG_STRIDE, 0, 0 }, + { DE_VIDEO2, MALIDP550_DE_LV2_BASE, MALIDP550_DE_LV2_PTR_BASE, + MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, 0 }, + { DE_SMART, MALIDP550_DE_LS_BASE, MALIDP550_DE_LS_PTR_BASE, + MALIDP550_DE_LS_R1_STRIDE, 0, 0 }, +}; + +static const struct malidp_layer malidp650_layers[] = { + /* id, base address, fb pointer address base, stride offset, + * yuv2rgb matrix offset, mmu control register offset + */ + { DE_VIDEO1, MALIDP550_DE_LV1_BASE, MALIDP550_DE_LV1_PTR_BASE, + MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, + MALIDP650_DE_LV_MMU_CTRL }, + { DE_GRAPHICS1, MALIDP550_DE_LG_BASE, MALIDP550_DE_LG_PTR_BASE, + MALIDP_DE_LG_STRIDE, 0, MALIDP650_DE_LG_MMU_CTRL }, + { DE_VIDEO2, MALIDP550_DE_LV2_BASE, MALIDP550_DE_LV2_PTR_BASE, + MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, + MALIDP650_DE_LV_MMU_CTRL }, + { DE_SMART, MALIDP550_DE_LS_BASE, MALIDP550_DE_LS_PTR_BASE, + MALIDP550_DE_LS_R1_STRIDE, 0, MALIDP650_DE_LS_MMU_CTRL }, };

#define SE_N_SCALING_COEFFS 96 @@ -853,8 +882,8 @@ const struct malidp_hw malidp_device[MALIDP_MAX_DEVICES] = { .dc_base = MALIDP550_DC_BASE, .out_depth_base = MALIDP550_DE_OUTPUT_DEPTH, .features = MALIDP_REGMAP_HAS_CLEARIRQ, - .n_layers = ARRAY_SIZE(malidp550_layers), - .layers = malidp550_layers, + .n_layers = ARRAY_SIZE(malidp650_layers), + .layers = malidp650_layers, .de_irq_map = { .irq_mask = MALIDP_DE_IRQ_UNDERRUN | MALIDP650_DE_IRQ_DRIFT | diff --git a/drivers/gpu/drm/arm/malidp_hw.h b/drivers/gpu/drm/arm/malidp_hw.h index 9fc94c08190f..0d7f9ea0ade8 100644 --- a/drivers/gpu/drm/arm/malidp_hw.h +++ b/drivers/gpu/drm/arm/malidp_hw.h @@ -62,6 +62,7 @@ struct malidp_layer { u16 ptr; /* address offset for the pointer register */ u16 stride_offset; /* offset to the first stride register. */ s16 yuv2rgb_offset; /* offset to the YUV->RGB matrix entries */ + u16 mmu_ctrl_offset; /* offset to the MMU control register */ };

enum malidp_scaling_coeff_set { diff --git a/drivers/gpu/drm/arm/malidp_planes.c b/drivers/gpu/drm/arm/malidp_planes.c index 39416bcd880e..76aafc296e1b 100644 --- a/drivers/gpu/drm/arm/malidp_planes.c +++ b/drivers/gpu/drm/arm/malidp_planes.c @@ -10,11 +10,14 @@ * ARM Mali DP plane manipulation routines. */

+#include <linux/iommu.h> + #include <drm/drmP.h> #include <drm/drm_atomic.h> #include <drm/drm_atomic_helper.h> #include <drm/drm_fb_cma_helper.h> #include <drm/drm_gem_cma_helper.h> +#include <drm/drm_gem_framebuffer_helper.h> #include <drm/drm_plane_helper.h> #include <drm/drm_print.h>

@@ -57,6 +60,13 @@ */ #define MALIDP_ALPHA_LUT 0xffaa5500

+/* page sizes the MMU prefetcher can support */ +#define MALIDP_MMU_PREFETCH_PARTIAL_PGSIZES (SZ_4K | SZ_64K) +#define MALIDP_MMU_PREFETCH_FULL_PGSIZES (SZ_1M | SZ_2M) + +/* readahead for partial-frame prefetch */ +#define MALIDP_MMU_PREFETCH_READAHEAD 8 + static void malidp_de_plane_destroy(struct drm_plane *plane) { struct malidp_plane *mp = to_malidp_plane(plane); @@ -101,6 +111,9 @@ drm_plane_state *malidp_duplicate_plane_state(struct drm_plane *plane) state->format = m_state->format; state->n_planes = m_state->n_planes;

+ state->mmu_prefetch_mode = m_state->mmu_prefetch_mode; + state->mmu_prefetch_pgsize = m_state->mmu_prefetch_pgsize; + return &state->base; }

@@ -113,6 +126,12 @@ static void malidp_destroy_plane_state(struct drm_plane *plane, kfree(m_state); }

+static const char * const prefetch_mode_names[] = { + [MALIDP_PREFETCH_MODE_NONE] = "MMU_PREFETCH_NONE", + [MALIDP_PREFETCH_MODE_PARTIAL] = "MMU_PREFETCH_PARTIAL", + [MALIDP_PREFETCH_MODE_FULL] = "MMU_PREFETCH_FULL", +}; + static void malidp_plane_atomic_print_state(struct drm_printer *p, const struct drm_plane_state *state) { @@ -121,6 +140,9 @@ static void malidp_plane_atomic_print_state(struct drm_printer *p, drm_printf(p, "\trotmem_size=%u\n", ms->rotmem_size); drm_printf(p, "\tformat_id=%u\n", ms->format); drm_printf(p, "\tn_planes=%u\n", ms->n_planes); + drm_printf(p, "\tmmu_prefetch_mode=%s\n", + prefetch_mode_names[ms->mmu_prefetch_mode]); + drm_printf(p, "\tmmu_prefetch_pgsize=%d\n", ms->mmu_prefetch_pgsize); }

static const struct drm_plane_funcs malidp_de_plane_funcs = { @@ -174,6 +196,199 @@ static int malidp_se_check_scaling(struct malidp_plane *mp, return 0; }

+static u32 malidp_get_pgsize_bitmap(struct malidp_plane *mp) +{ + u32 pgsize_bitmap = 0; + + if (iommu_present(&platform_bus_type)) { + struct iommu_domain *mmu_dom = + iommu_get_domain_for_dev(mp->base.dev->dev); + + if (mmu_dom) + pgsize_bitmap = mmu_dom->pgsize_bitmap; + } + + return pgsize_bitmap; +} + +/* + * Check if the framebuffer is entirely made up of pages at least pgsize in + * size. Only a heuristic: assumes that each scatterlist entry has been aligned + * to the largest page size smaller than its length and that the MMU maps to + * the largest page size possible. + */ +static bool malidp_check_pages_threshold(struct malidp_plane_state *ms, + u32 pgsize) +{ + int i; + + for (i = 0; i < ms->n_planes; i++) { + struct drm_gem_object *obj; + struct drm_gem_cma_object *cma_obj; + struct sg_table *sgt; + struct scatterlist *sgl; + + obj = drm_gem_fb_get_obj(ms->base.fb, i); + cma_obj = to_drm_gem_cma_obj(obj); + + if (cma_obj->sgt) + sgt = cma_obj->sgt; + else + sgt = obj->dev->driver->gem_prime_get_sg_table(obj); + + if (!sgt) + return false; + + sgl = sgt->sgl; + + while (sgl) { + if (sgl->length < pgsize) { + if (!cma_obj->sgt) + kfree(sgt); + return false; + } + + sgl = sg_next(sgl); + } + if (!cma_obj->sgt) + kfree(sgt); + } + + return true; +} + +/* + * Check if it is possible to enable partial-frame MMU prefetch given the + * current format, AFBC state and rotation. + */ +static bool malidp_partial_prefetch_supported(u32 format, u64 modifier, + unsigned int rotation) +{ + bool afbc, sparse; + + /* rotation and horizontal flip not supported for partial prefetch */ + if (rotation & (DRM_MODE_ROTATE_90 | DRM_MODE_ROTATE_180 | + DRM_MODE_ROTATE_270 | DRM_MODE_REFLECT_X)) + return false; + + afbc = modifier & DRM_FORMAT_MOD_ARM_AFBC(0); + sparse = modifier & AFBC_FORMAT_MOD_SPARSE; + + switch (format) { + case DRM_FORMAT_ARGB2101010: + case DRM_FORMAT_RGBA1010102: + case DRM_FORMAT_BGRA1010102: + case DRM_FORMAT_ARGB8888: + case DRM_FORMAT_RGBA8888: + case DRM_FORMAT_BGRA8888: + case DRM_FORMAT_XRGB8888: + case DRM_FORMAT_XBGR8888: + case DRM_FORMAT_RGBX8888: + case DRM_FORMAT_BGRX8888: + case DRM_FORMAT_RGB888: + case DRM_FORMAT_RGBA5551: + case DRM_FORMAT_RGB565: + /* always supported */ + return true; + + case DRM_FORMAT_ABGR2101010: + case DRM_FORMAT_ABGR8888: + case DRM_FORMAT_ABGR1555: + case DRM_FORMAT_BGR565: + /* supported, but if AFBC then must be sparse mode */ + return (!afbc) || (afbc && sparse); + + case DRM_FORMAT_BGR888: + /* supported, but not for AFBC */ + return !afbc; + + case DRM_FORMAT_YUYV: + case DRM_FORMAT_UYVY: + case DRM_FORMAT_NV12: + case DRM_FORMAT_YUV420: + /* not supported */ + return false; + + default: + return false; + } +} + +/* + * Select the preferred MMU prefetch mode. Full-frame prefetch is preferred as + * long as the framebuffer is all large pages. Otherwise partial-frame prefetch + * is selected as long as it is supported for the current format. The selected + * page size for prefetch is returned in pgsize_bitmap. + */ +static enum mmu_prefetch_mode malidp_mmu_prefetch_select_mode + (struct malidp_plane_state *ms, u32 *pgsize_bitmap) +{ + u32 pgsizes; + + /* get the full-frame prefetch page size(s) supported by the MMU */ + pgsizes = *pgsize_bitmap & MALIDP_MMU_PREFETCH_FULL_PGSIZES; + + while (pgsizes) { + u32 largest_pgsize = 1 << __fls(pgsizes); + + if (malidp_check_pages_threshold(ms, largest_pgsize)) { + *pgsize_bitmap = largest_pgsize; + return MALIDP_PREFETCH_MODE_FULL; + } + + pgsizes -= largest_pgsize; + } + + /* get the partial-frame prefetch page size(s) supported by the MMU */ + pgsizes = *pgsize_bitmap & MALIDP_MMU_PREFETCH_PARTIAL_PGSIZES; + + if (malidp_partial_prefetch_supported(ms->base.fb->format->format, + ms->base.fb->modifier, + ms->base.rotation)) { + /* partial prefetch using the smallest page size */ + *pgsize_bitmap = 1 << __ffs(pgsizes); + return MALIDP_PREFETCH_MODE_PARTIAL; + } + *pgsize_bitmap = 0; + return MALIDP_PREFETCH_MODE_NONE; +} + +static u32 malidp_calc_mmu_control_value(enum mmu_prefetch_mode mode, + u8 readahead, u8 n_planes, u32 pgsize) +{ + u32 mmu_ctrl = 0; + + if (mode != MALIDP_PREFETCH_MODE_NONE) { + mmu_ctrl |= MALIDP_MMU_CTRL_EN; + + if (mode == MALIDP_PREFETCH_MODE_PARTIAL) { + mmu_ctrl |= MALIDP_MMU_CTRL_MODE; + mmu_ctrl |= MALIDP_MMU_CTRL_PP_NUM_REQ(readahead); + } + + if (pgsize == SZ_64K || pgsize == SZ_2M) { + int i; + + for (i = 0; i < n_planes; i++) + mmu_ctrl |= MALIDP_MMU_CTRL_PX_PS(i); + } + } + + return mmu_ctrl; +} + +static void malidp_de_prefetch_settings(struct malidp_plane *mp, + struct malidp_plane_state *ms) +{ + if (!mp->layer->mmu_ctrl_offset) + return; + + /* get the page sizes supported by the MMU */ + ms->mmu_prefetch_pgsize = malidp_get_pgsize_bitmap(mp); + ms->mmu_prefetch_mode = + malidp_mmu_prefetch_select_mode(ms, &ms->mmu_prefetch_pgsize); +} + static int malidp_de_plane_check(struct drm_plane *plane, struct drm_plane_state *state) { @@ -250,6 +465,8 @@ static int malidp_de_plane_check(struct drm_plane *plane, fb->format->has_alpha) return -EINVAL;

+ malidp_de_prefetch_settings(mp, ms); + return 0; }

@@ -326,6 +543,24 @@ static void malidp_de_set_color_encoding(struct malidp_plane *plane, } }

+static void malidp_de_set_mmu_control(struct malidp_plane *mp, + struct malidp_plane_state *ms) +{ + u32 mmu_ctrl; + + /* check hardware supports MMU prefetch */ + if (!mp->layer->mmu_ctrl_offset) + return; + + mmu_ctrl = malidp_calc_mmu_control_value(ms->mmu_prefetch_mode, + MALIDP_MMU_PREFETCH_READAHEAD, + ms->n_planes, + ms->mmu_prefetch_pgsize); + + malidp_hw_write(mp->hwdev, mmu_ctrl, + mp->layer->base + mp->layer->mmu_ctrl_offset); +} + static void malidp_de_plane_update(struct drm_plane *plane, struct drm_plane_state *old_state) { @@ -358,6 +593,9 @@ static void malidp_de_plane_update(struct drm_plane *plane, malidp_hw_write(mp->hwdev, lower_32_bits(fb_addr), ptr); malidp_hw_write(mp->hwdev, upper_32_bits(fb_addr), ptr + 4); } + + malidp_de_set_mmu_control(mp, ms); + malidp_de_set_plane_pitches(mp, ms->n_planes, state->fb->pitches);

diff --git a/drivers/gpu/drm/arm/malidp_regs.h b/drivers/gpu/drm/arm/malidp_regs.h index 6ffe849774f2..7ce3e141464d 100644 --- a/drivers/gpu/drm/arm/malidp_regs.h +++ b/drivers/gpu/drm/arm/malidp_regs.h @@ -247,6 +247,17 @@ #define MALIDP550_CONFIG_VALID 0x0c014 #define MALIDP550_CONFIG_ID 0x0ffd4

+/* register offsets specific to DP650 */ +#define MALIDP650_DE_LV_MMU_CTRL 0x000D0 +#define MALIDP650_DE_LG_MMU_CTRL 0x00048 +#define MALIDP650_DE_LS_MMU_CTRL 0x00078 + +/* bit masks to set the MMU control register */ +#define MALIDP_MMU_CTRL_EN (1 << 0) +#define MALIDP_MMU_CTRL_MODE (1 << 4) +#define MALIDP_MMU_CTRL_PX_PS(x) (1 << (8 + (x))) +#define MALIDP_MMU_CTRL_PP_NUM_REQ(x) (((x) & 0x7f) << 12) + /* * Starting with DP550 the register map blocks has been standardised to the * following layout: