linux-kernel - [PATCH 5.17 064/158] drm/i915/dmc: Add MMIO range restrictions

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Date:   Mon, 23 May 2022 19:03:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lucas De Marchi <lucas.demarchi@...el.com>,
        Anusha Srivatsa <anusha.srivatsa@...el.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Subject: [PATCH 5.17 064/158] drm/i915/dmc: Add MMIO range restrictions

From: Anusha Srivatsa <anusha.srivatsa@...el.com>

commit 54395a33718af1c04b5098203335b25382291a16 upstream.

Bspec has added some steps that check forDMC MMIO range before
programming them

v2: Fix for CI
v3: move register defines to .h (Anusha)
- Check MMIO restrictions per pipe
- Add MMIO restricton for v1 dmc header as well (Lucas)
v4: s/_PICK/_PICK_EVEN and use it only for Pipe DMC scenario.
- clean up sanity check logic.(Lucas)
- Add MMIO range for RKL as well.(Anusha)
v5: Use DISPLAY_VER instead of per platform check (Lucas)

BSpec: 49193

Cc: stable@...r.kernel.org
Cc: Lucas De Marchi <lucas.demarchi@...el.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@...el.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@...el.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@...el.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220511000847.1068302-1-anusha.srivatsa@intel.com
(cherry picked from commit 21c47196aec3a93f913a7515e1e7b30e6c54d6c6)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/i915/display/intel_dmc.c |   44 +++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_reg.h          |   16 +++++++++++
 2 files changed, 60 insertions(+)

--- a/drivers/gpu/drm/i915/display/intel_dmc.c
+++ b/drivers/gpu/drm/i915/display/intel_dmc.c
@@ -367,6 +367,44 @@ static void dmc_set_fw_offset(struct int
 	}
 }
 
+static bool dmc_mmio_addr_sanity_check(struct intel_dmc *dmc,
+				       const u32 *mmioaddr, u32 mmio_count,
+				       int header_ver, u8 dmc_id)
+{
+	struct drm_i915_private *i915 = container_of(dmc, typeof(*i915), dmc);
+	u32 start_range, end_range;
+	int i;
+
+	if (dmc_id >= DMC_FW_MAX) {
+		drm_warn(&i915->drm, "Unsupported firmware id %u\n", dmc_id);
+		return false;
+	}
+
+	if (header_ver == 1) {
+		start_range = DMC_MMIO_START_RANGE;
+		end_range = DMC_MMIO_END_RANGE;
+	} else if (dmc_id == DMC_FW_MAIN) {
+		start_range = TGL_MAIN_MMIO_START;
+		end_range = TGL_MAIN_MMIO_END;
+	} else if (DISPLAY_VER(i915) >= 13) {
+		start_range = ADLP_PIPE_MMIO_START;
+		end_range = ADLP_PIPE_MMIO_END;
+	} else if (DISPLAY_VER(i915) >= 12) {
+		start_range = TGL_PIPE_MMIO_START(dmc_id);
+		end_range = TGL_PIPE_MMIO_END(dmc_id);
+	} else {
+		drm_warn(&i915->drm, "Unknown mmio range for sanity check");
+		return false;
+	}
+
+	for (i = 0; i < mmio_count; i++) {
+		if (mmioaddr[i] < start_range || mmioaddr[i] > end_range)
+			return false;
+	}
+
+	return true;
+}
+
 static u32 parse_dmc_fw_header(struct intel_dmc *dmc,
 			       const struct intel_dmc_header_base *dmc_header,
 			       size_t rem_size, u8 dmc_id)
@@ -436,6 +474,12 @@ static u32 parse_dmc_fw_header(struct in
 		return 0;
 	}
 
+	if (!dmc_mmio_addr_sanity_check(dmc, mmioaddr, mmio_count,
+					dmc_header->header_ver, dmc_id)) {
+		drm_err(&i915->drm, "DMC firmware has Wrong MMIO Addresses\n");
+		return 0;
+	}
+
 	for (i = 0; i < mmio_count; i++) {
 		dmc_info->mmioaddr[i] = _MMIO(mmioaddr[i]);
 		dmc_info->mmiodata[i] = mmiodata[i];
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7938,6 +7938,22 @@ enum {
 /* MMIO address range for DMC program (0x80000 - 0x82FFF) */
 #define DMC_MMIO_START_RANGE	0x80000
 #define DMC_MMIO_END_RANGE	0x8FFFF
+#define DMC_V1_MMIO_START_RANGE	0x80000
+#define TGL_MAIN_MMIO_START	0x8F000
+#define TGL_MAIN_MMIO_END	0x8FFFF
+#define _TGL_PIPEA_MMIO_START	0x92000
+#define _TGL_PIPEA_MMIO_END	0x93FFF
+#define _TGL_PIPEB_MMIO_START	0x96000
+#define _TGL_PIPEB_MMIO_END	0x97FFF
+#define ADLP_PIPE_MMIO_START	0x5F000
+#define ADLP_PIPE_MMIO_END	0x5FFFF
+
+#define TGL_PIPE_MMIO_START(dmc_id)	_PICK_EVEN(((dmc_id) - 1), _TGL_PIPEA_MMIO_START,\
+						_TGL_PIPEB_MMIO_START)
+
+#define TGL_PIPE_MMIO_END(dmc_id)	_PICK_EVEN(((dmc_id) - 1), _TGL_PIPEA_MMIO_END,\
+						_TGL_PIPEB_MMIO_END)
+
 #define SKL_DMC_DC3_DC5_COUNT	_MMIO(0x80030)
 #define SKL_DMC_DC5_DC6_COUNT	_MMIO(0x8002C)
 #define BXT_DMC_DC3_DC5_COUNT	_MMIO(0x80038)