[PATCH] drm/malidp: Enable MMU prefetch on Mali-DP650
Liviu Dudau
Liviu.Dudau at foss.arm.com
Fri Sep 21 12:23:56 UTC 2018
On Mon, Aug 20, 2018 at 01:50:29PM +0100, Alexandru Gheorghe wrote:
> From: Jamie Fox <jamie.fox at 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.
>
> Signed-off-by: Jamie Fox <jamie.fox at arm.com>
> Signed-off-by: Alexandru Gheorghe <alexandru-cosmin.gheorghe at arm.com>
Acked-by: Liviu Dudau <liviu.dudau at arm.com>
> ---
> drivers/gpu/drm/arm/malidp_drv.h | 9 ++
> drivers/gpu/drm/arm/malidp_hw.c | 17 +-
> drivers/gpu/drm/arm/malidp_hw.h | 1 +
> drivers/gpu/drm/arm/malidp_planes.c | 233 ++++++++++++++++++++++++++++
> drivers/gpu/drm/arm/malidp_regs.h | 11 ++
> 5 files changed, 269 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/arm/malidp_drv.h b/drivers/gpu/drm/arm/malidp_drv.h
> index e3eb0cb1f385..2d824558216f 100644
> --- a/drivers/gpu/drm/arm/malidp_drv.h
> +++ b/drivers/gpu/drm/arm/malidp_drv.h
> @@ -53,6 +53,13 @@ struct malidp_plane {
> struct drm_plane base;
> struct malidp_hw_device *hwdev;
> 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 {
> @@ -63,6 +70,8 @@ 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 c94a4422e0e9..4233be1c5709 100644
> --- a/drivers/gpu/drm/arm/malidp_hw.c
> +++ b/drivers/gpu/drm/arm/malidp_hw.c
> @@ -96,6 +96,19 @@ static const struct malidp_layer malidp550_layers[] = {
> { DE_SMART, MALIDP550_DE_LS_BASE, MALIDP550_DE_LS_PTR_BASE, MALIDP550_DE_LS_R1_STRIDE, 0 },
> };
>
> +static const struct malidp_layer malidp650_layers[] = {
> + { 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
> static const u16 dp500_se_scaling_coeffs[][SE_N_SCALING_COEFFS] = {
> [MALIDP_UPSCALING_COEFFS - 1] = {
> @@ -832,8 +845,8 @@ 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 ad2e96915d44..39b92a9fb810 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 29409a65d864..99c487be9a1d 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>
>
> @@ -56,6 +59,13 @@
> */
> #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);
> @@ -103,6 +113,9 @@ 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;
> }
>
> @@ -115,6 +128,12 @@ 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)
> {
> @@ -123,6 +142,9 @@ 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 = {
> @@ -176,6 +198,9 @@ static int malidp_se_check_scaling(struct malidp_plane *mp,
> return 0;
> }
>
> +static void malidp_de_prefetch_settings(struct malidp_plane *mp,
> + struct malidp_plane_state *ms);
> +
> static int malidp_de_plane_check(struct drm_plane *plane,
> struct drm_plane_state *state)
> {
> @@ -245,6 +270,7 @@ static int malidp_de_plane_check(struct drm_plane *plane,
> ms->rotmem_size = val;
> }
>
> + malidp_de_prefetch_settings(mp, ms);
> return 0;
> }
>
> @@ -321,6 +347,210 @@ static void malidp_de_set_color_encoding(struct malidp_plane *plane,
> }
> }
>
> +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 sg_table *sgt;
> + struct scatterlist *sgl;
> +
> + obj = drm_gem_fb_get_obj(ms->base.fb, i);
> + sgt = obj->dev->driver->gem_prime_get_sg_table(obj);
> +
> + if (!sgt)
> + return false;
> +
> + sgl = sgt->sgl;
> +
> + while (sgl) {
> + if (sgl->length < pgsize) {
> + kfree(sgt);
> + return false;
> + }
> +
> + sgl = sg_next(sgl);
> + }
> +
> + 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 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)
> {
> @@ -351,6 +581,9 @@ 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,
> plane->state->fb->pitches);
>
> diff --git a/drivers/gpu/drm/arm/malidp_regs.h b/drivers/gpu/drm/arm/malidp_regs.h
> index 3579d36b2a71..c60fff4b2aaf 100644
> --- a/drivers/gpu/drm/arm/malidp_regs.h
> +++ b/drivers/gpu/drm/arm/malidp_regs.h
> @@ -245,6 +245,17 @@
> #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:
> --
> 2.18.0
>
--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
¯\_(ツ)_/¯
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